JP2000234328A - Grout injection device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate the chemical reaction of mixed chemicals in a prescribed pressure state in double pipe type grout injection and to reliably conduct flash setting grout injection, composite injection of flash setting grout and slow setting grout in turn or large-quantity continuous injection into the ground. SOLUTION: An expandable/shrinkable frame is provided for a taper type check valve 5' made of rubber from the tip of an inner pipe 4 to the tip of an outer pipe of a grout injection device 1, the inverted warp of the check valve 5' is prevented even when the grout pressure at the large depth of a lower chemical pressurizing/mixing chamber, and a diaphragm provided with a check valve via a spring 12 is arranged on the chemical pressurizing/mixing chamber to open or close the discharge port of an outer pipe 2. The inverted warp of the check valve 5' is prevented even when the feed pressure of a main agent at a large depth is large, the chemical reaction of chemicals in the chemical pressurizing/mixing chamber is reliably accelerated, and a created body in the ground can be constructed as designed via boring in a prescribed pressure state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art The disclosed technology is intended to improve the ground construction work or the like by using a predetermined grout or the like through a drilled hole formed in the ground and through the drilled hole into the ground without fail in a 1.5 shot method. It belongs to the field of injection technology using a two-shot method or the like.

[0002]

2. Description of the Related Art As is well known, the improvement of civil society is supported by the rise of industrial society, and various facilities of this kind of industrial society are mostly built on the ground in a predetermined manner. It is necessary that the strength of the ground on which the ground is constructed be sufficiently ensured. Therefore, so-called ground improvement works have been variously developed and researched and put into practical use so that the soft ground has a predetermined strength. In recent years, pollution problems such as river pollution and environmental destruction problems have occurred not only in some areas but also on a global scale. A water-glass based chemical liquid injection method has not been developed, and the so-called 1.5-shot method, 2-shot method, and the like of the main agent A liquid and the liquid B as a reactant have been widely used. For chemical injection Then, in order to cope with the clogging phenomenon in the pipe, etc., in order to improve the mixing property between the main agent A solution and the reactant B solution, the heavy agent of the A solution and the reactant of the B solution are mutually independent through separate passages. A technique has been developed for separately feeding, merging, mixing, and imparting good reactivity to inject into the ground, for example, Japanese Patent Application Laid-Open No. 53-126711 (Japanese Patent Publication No.
No. 52247), a grout injection device 1 having a double-pipe check valve 5 as shown in FIG. 7 has been developed.

[0003] The grout injection device 1 is connected to the
In brief, the inner pipe 4 is extended from the discharge port 3 of the outer pipe 2 into the outer pipe 2, and a downward direction made of rubber or the like having a predetermined rigidity is provided in the passage 10 between the two pipes 2 and 4. A taper type check valve 5 is interposed in the supply passage 10 for the reactant B between the outer pipe 3 and the inner pipe 4, and a blind bolt 7 is provided at the tip of the inner pipe 4 to seal the inner pipe 4. A flexible sleeve 9 made of rubber or the like is provided around a spout 8 provided above the blind bolt 7,
At the time of drilling, as shown in FIG. 8D, drilling water such as fresh water is supplied to the inner and outer tubular gap passages 10 to assist the drilling so that drilling is performed. As shown in (e), the main agent A is pumped into the passage 10 of the inner and outer tubes, and the reactant B is pumped through the passage 9 in the inner tube 4,
Also, as shown in (f), the main agent A and the reactant B are supplied to the passage 10 between the inner tube 4 and the ring of the outer tube 2, and the discharge port is provided below the check valve 5. The main agent A from 3 and the reactant B from the spout 8 of the inner tube 4 are mixed and reacted in a process of merging, or the main agent A and the reactant B are supplied to the passages 9 and 10 together. 5 and a mixing reaction is performed at the lower part of the discharge port 8 'on the side.
The mixed chemical solution is injected into the ground from the side, and the backflow of the main agent A is prevented by the sleeve 9 in the process,
The backflow of the reactant B is prevented by the check valve 5, and
The injection of a chemical solution such as a shot method or a two-shot method is performed efficiently.

[0004]

However, in the ground improvement work of the actual construction, if the drilling and the depth become large, the water is fed into the passage of the inner pipe 4 of the injection device 1. It is necessary to increase the supply pressure of the main agent A or the reactant B of the chemical solution to be performed, and to infiltrate and inject a large area into a large volume of soil from one injection pipe as in the liquefaction prevention construction. For this purpose, it is necessary to continuously inject a large amount of the chemical for a long time, and in particular, it may be necessary to inject a large amount of a flash-setting agent into the soft ground having a low strength. The continuous injection of the drug solution over time requires a large supply pressure, and the inner pressure of the main agent A or the reactant B is increased due to the small diameter of the inner tube 4 with respect to the outer tube 2, The deeper it is, the higher the pressure of the main agent A or the reactant B, the lower the fluidity, or the lower the resistance. It is increased, also, when the composite injection,
The pressure builds up in each flash-injection process, resulting in a base A
Then, the internal pressure of the reactant B in the reaction chamber below the check valve 5 increases, and the check valve 5 reversely reverts to an upward diverging state as shown in FIG. It has come to be understood that there occurs a drawback that the mixed chemical liquid flows back to the passage 10 of the outer tube 2 in a divergent state, and as a result, it is difficult to inject the chemical liquid that has reacted sufficiently as designed. As a result, there is a disadvantage that the construction accuracy is reduced and the construction efficiency is also deteriorated.

[0005]

It is an object of the invention of this application to provide a function of a check valve in a mixing reaction chamber when a double tube type grout or the like is injected by a 1.5 shot method or a two shot method. The technical problem to be solved is to completely solve the problem that the chemical injection function as designed is impaired, and the main agent and the reactant are completely mixed, and the check valve function is surely fulfilled. An excellent grout injection device that forms a chemical pressurized reaction chamber, and after a reliable chemical reaction is formed as designed, allows injection into soft ground, and benefits the civil engineering application field in the construction industry and It is intended to provide an injection method.

[0006]

In order to solve the above-mentioned problems in accordance with the above-mentioned objects, the structure of the invention of the present application having the features of the above-mentioned claims is to improve soft ground in order to solve the above-mentioned problems. A grout injection device provided with a check valve made of a flexible material of a tapered type in which a set position above the discharge port end of the outer pipe extends downward from the discharge port end, and a method using the device. In the above, a frame for preventing the valve body of the check valve from reversing and reversing is provided in the valve body of the check valve, so that the frame is integrated with the valve body, The frame may be formed separately from the valve body, and further, the frame may be formed integrally when the valve body is formed, and the frame may be formed separately from the valve body when formed. If
A diaphragm is provided to the outer tube below the check valve to form a chemical pressurized mixing chamber between the check valve and the outer pipe, and a pressurized mixing phenomenon in which a pressure responsive valve is interposed in the diaphragm. And the pressure responsive valve may be a check valve biased by a pressing spring,
In addition, if the diaphragm is arranged on a slide bracket that can open and close the discharge port of the outer tube, a non-return is required when injecting instantaneous grout or injecting alternate composite grout of instantaneous and loosening grout. Even if the pressure in the chemical pressurized mixing chamber below the valve is increased, the backflow of the chemical solution is prevented, and technical measures are taken to ensure that grout is injected into the ground.

[0007]

When the soft ground improvement construction work or the like is performed using the above-described double-pipe grout injection apparatus, the discharge port end of the double-pipe grout injection apparatus with respect to the discharge port end of the outer pipe is used. When providing a check valve of a flexible preparation such as rubber of a tapered type having a downward spread at the upper portion of a fixed position, the reverse warpage prevention having a predetermined strength and rigidity which is integrally embedded when manufacturing the check valve. Frame is arranged or attached separately from the check valve main body to prevent the check valve from reversing and reversing, and to fully achieve the check valve function of the check valve,
The chemical pressurized mixing chamber formed below the check valve when the drilling water and the main agent and the reactant are separately and reliably supplied, and when the instantaneous grout is injected or combined injection is performed. Even if the mixing pressure is increased at large depths, the pressure of the sleeve will not be reached unless the set high pressure state is achieved by interposing a pressure responsive valve through a spring etc. on the diaphragm provided in the chemical pressurized mixing chamber. When the structural valve was not opened by operating the check valve function and reached the set high pressure state, the pressure responsive valve of the check valve was opened, and a sufficient chemical reaction was performed in the chemical pressurized pressure mixing chamber which opened mainly downward. The chemical solution reacts and mixes in a predetermined manner, and is ejected downward or to the side,
In addition, the slide bracket to which the diaphragm is passed opens the discharge port formed in the outer tube and discharges the mixed grout which has sufficiently finished the chemical reaction to the side as well as the side, and integrally as designed. Even when grout is injected into the ground, or when grout is mixed with grout and loose grout, or when a large amount of grout is continuously injected for a long time, the ground is split and the grout does not escape into the weakly viscous ground. After the solidification is completed, the liquid medicine is surely injected into the ground.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG.

The same parts as those in FIGS. 7 and 8 are described using the same reference numerals.

In the embodiment of the embodiment shown in FIGS.
′ Is a grouting apparatus which constitutes one gist of the invention of this application, and is used for improving the construction work on a weak ground or the like, through which a base material A and a reactant B are introduced into the ground through a hole formed in the ground. This is a mode in which a chemical solution as a mixed grout (flashing grout or the like) is injected in a mixed reaction state. The grout injection device 1 is of a double tube type, and its outer tube 2 is an inner tube 4 is a hard rubber having a predetermined rigidity of a tapered type having a distal end portion extending to a predetermined distal end portion of the outer tube 2, having a distal end contacting the inner wall of the outer tube 2 from the distal end portion, and opening diagonally downward. A girder-shaped check valve 5 'made of a flexible material such as a plastic material has a base end provided with a band 6 inside the tip of the inner tube 4.
′.

Accordingly, the check valve 5 'is originally formed from the ring-shaped passage 10 formed between the outer tube 1 and the inner tube 4 similarly to the check valve 5 of the conventional embodiment shown in FIG. It is opened upon the discharge flow of the reactant B, and the chemical pressurized mixing chamber 16 below it is opened.
In particular, when the pressure in the passage 9 of the main agent A in the inner tube 4 is higher than that in the passage 10 of the reactant B (in the case of instantaneous grout, etc.), the reversal inversion is inherently increased. It is equipped with elasticity and strength that does not occur.

As one of the points of the gist of the present invention, the check valve 5 'is provided with a frame 16 for preventing the reversal of the check valve 5'. As shown in FIG. 2, a circular frame 16 is formed separately from the stop valve 5 '.
2 (a), (b) and (c), the base ring has an aggregate 19 '' with four circumferential sleeves. A joint 20 is provided, and ring-shaped aggregates 19, 19 are divided along a tapered cone of a taper type of the check valve 5 'so as to be relatively expandable and contractible within the sleeve joint 20. In the sleeve joint 20, when the opposing ends of the opposing aggregates 19, 19 are separated by a set distance, a stopper member 21 is provided so as not to spread apart further.

Therefore, the aggregates 19,
In the present embodiment, eight radial aggregates 17 are fixed to the sleeve joints 20 with respect to the aggregates 19 to 19, and each of the sleeve joints 20 is provided above the check valve 5 '. Due to the arrangement on the surface, the check valve 5 ′ can be reduced in the process at the stage of pressing and flowing in the forward direction through the passage 10 of the reactant B. The aggregate 19 is located in the sleeve joint 20 and is opposed to and proximate to a reduced state, so that the reactant B can be discharged and discharged into the chemical pressurized reaction chamber 16 ′, and the aggregated material 19 can be discharged at a large depth. When the pressure in the chemical pressurized mixing chamber 16 'increases due to the high pressure of the instantaneous grouting and the reversal of the check valve 5' is caused by the rubber elasticity of the check valve 5 ', the aggregates 19, 19' and the sleeve of each ring are produced. In the joint 20 by the stopper member 21 For more than a certain distance it can not be separated, via a sleeve joint 20, reversing warpage without a check valve 5 'which is fixed to the frame 16, therefore, such as shown in FIG. 8 chemical pressure mixing chamber 16
There is no backflow in the flow passage 10 for the reactant B of the mixed chemical liquid in the main agent A and the one-way flow of the main agent A and the reactant B to the chemical pressure mixing chamber 16 'of the check valve 5'. Discharge mixing is performed.

In this case, as shown in FIG. 3, in the sleeve joint 20, a stopper 22 for the stopper 21 of the aggregate 19 may be provided so as to reliably prevent the aggregate 19 from being shifted to the set distance. I can do it.

In each of the embodiments described above, the frame 16 manufactured separately from the check valve 5 'is disposed on the front side of the upper surface of the check valve 5'. In the embodiment shown in FIG. In the step of forming the ′, the frame 16 is optimally molded into the thick portion of the check valve 5 ′, and the effect obtained is the same as in the above-described embodiment. Can be prevented.

In the embodiment shown in FIG. 5, a frame 16 '''made separately from the check valve 5' as in the above-described embodiment is separately provided on the upper surface on the front side of the check valve 5 '. This is an embodiment in which it is formed and integrally provided via a sulfurating treatment, and is a kind of design-changing embodiment, and the function and effect to be achieved are the same as those of the above-described embodiments.

The ring aggregates 19 ', 19''
As shown in FIG. 6, one aggregate 1 is attached to the tip of one aggregate 19 ″ without passing through the sleeve joint 20.
In this embodiment, a stopper 22 for the 9 'stopper member 21 is formed so that the stopper can be freely reduced, but the expansion is restricted so as not to exceed a predetermined distance.

[0018] In the above-mentioned configuration, in the construction of a large-area, large-depth, soft ground improvement or liquefaction prevention injection, etc.
When performing instantaneous grouting or injecting a large amount, it is necessary to prevent the grout from escaping into the mud by splitting the ground on the side wall of the borehole.
′ Increases, but the check valve 5 ′ is provided by the frame 16.
Is prevented and the pressure is maintained, and grout can be injected as designed.

The embodiment of the invention of this application is not limited to the above-described embodiments. For example, the inner pipe 4 and the outer pipe 2 may be radiated from the inner pipe 4 to the outer pipe 2 separately from the check valve 5 '. A straight beam material having a specified strength and rigidity is laid diagonally downward, and not only the instantaneous setting method but also alternate compound injection of instantaneous setting grout and loose setting grout. Various modes such as using a method can be adopted.

Further, a pressure-responsive valve, which is one center of another aspect of the present invention, is provided below the check valve 5 ', and the main agent A is provided.
And a chemical pressure mixing chamber of reactant B to form 16 '
As shown in the lower part of FIG. 1, a diaphragm 15 is attached to a slide bracket 14 of a ring that allows a horizontal discharge port 3 ′ provided at the lower part of the outer tube 2 to be opened and closed, as shown in the lower part of FIG. The outlet 15
And a honeycomb type bracket 11 is provided below the diaphragm 15. A ball type check valve 013 is provided between the honeycomb bracket 11 and the discharge port 15 ′ of the diaphragm 15.
When the pressure in the chemical pressure mixing chamber 16 'exceeds a set pressure, the check valve 13 is opened against the spring 12 so that the chemical pressure increases. A well-mixed and chemically-reacted chemical solution of the main agent A and the reactant B in the mixing chamber 16 'is jetted downward mainly through the honeycomb bracket 11, and the slide bracket 14 is accordingly moved. In this embodiment, the main body A and the reactant in the chemical pressurized mixing chamber 16 'are discharged by sliding down to open the discharge port 8' to discharge a chemical solution such as mixed sideways. Since the mixed state of B is performed under the high pressure as designed, the chemical reaction is performed as designed, and the injection is performed in a state where the chemical reaction of the discharge to be discharged downward and to the side is sufficiently performed. Formed in Cylindrical Construction body also size as designed, the rigidity, strength.

For example, the check valve may be formed in a plurality of rings in the axial direction, and each ring may be provided with a joint for preventing warpage and reversal.

Further, as a matter of design change, it is of course possible to provide a stopper for preventing reversal warping at a portion which comes into contact with the outer pipe of the check valve.

[0023]

As described above, according to the invention of this application, drilling water is supplied to assist the formation of drilling, or the injection of 1.5 shots or the like with the main agent A and the reactant B is reduced. In the grouting apparatus and method performed by the instantaneous grouting, the instantaneous grouting, the loosening grout alternate composite injection method, or the like, through the hole, the pressure of the main agent on the inner tube side of the double-pipe type grouting device is increased by the inner tube. When the pressure of the reactant B is higher than the pressure of the reactant B, especially when the supply pressure at a large depth is not pumped through the passage of the ring of the outer tube, the divergent tapered flexible check valve extends from the inner tube to the outer tube. Is reversed to a warped state, and there is no possibility that the mixed chemical solution in the chemical pressurized mixing chamber below the check valve will flow back into the supply passage of the reactant B, so that instantaneous grout injection or loose grout at a large depth is possible. Smelling grout alternate compound injection However, the mixing of the main agent A and the reactant B in the low-pressure pressurized mixing chamber is surely performed under high pressure. Therefore, the differential pressure between the high-pressure main agent A in the inner tube and the reactant B on the outer periphery of the mixture is different from the high-pressure reaction. In combination, the chemical reaction between the main agent A and the reactant B in the chemical pressurized mixing chamber is performed as designed. Therefore, even if the chemical solution discharged into the ground through the borehole has a large resistance pressure, it is weak. The injection is stopped before the ground is split, and even if the system is intermittent, the pressure in the chemical pressurized mixing chamber does not decrease and the pressurized reaction is performed as designed, and the ground is injected reliably and the columnar shape as designed An excellent effect is achieved in that an underground structure is formed.

Further, a diaphragm is provided in the chemical pressurizing and mixing chamber, and a pressure responsive valve such as a check valve is provided on the diaphragm through a high pressure discharge. The pressure of the set high pressure state, that is, after the set chemical reaction has been sufficiently performed, grout injection at a large depth, or large-volume large-volume injection is reliably performed in order to discharge the chemical solution,
An excellent effect is achieved in that underground structures are constructed with high efficiency.

[Brief description of the drawings]

FIG. 1 is an overall schematic longitudinal sectional view of an embodiment of the present invention.

2 is a schematic view of a frame for preventing inversion, (a) is a half sectional side view thereof, (b) is a plan view of a quarter, and (c) is an assembled sectional view of a sleeve joint. is there.

FIG. 3 is a detailed sectional view of the sleeve joint.

FIG. 4 is an assembled sectional view of a check valve and a frame according to another embodiment.

FIG. 5 is a schematic sectional view of a main part of a check valve and a frame according to another embodiment.

FIG. 6 is a cross-sectional view of a main part of the aggregate of the frame.

FIG. 7 is a cross-sectional side view of a main part of a grouting device in a conventional mode.

FIG. 8 is a cross-sectional view of a relevant part of the check valve according to the embodiment in a state where the check valve is reversely bent.

FIGS. 9A, 9B, and 9C are cross-sectional views of an injection method of the apparatus.

[Explanation of symbols]

 Reference Signs List 5 outer pipe discharge port 1 'grout injection device 15 diaphragm 16' chemical pressurized mixing chamber 13 pressure responsive valve 12 press valve 14 slide bracket 5 'check valve 16 frame

Continued on the front page (72) Inventor Takeshi Sato 1-2-7 Koraku, Bunkyo-ku, Tokyo F-term (reference) 2D040 AB01 AC05 CB03 CD08 DA03 DA08 DA14

Claims (7)

[Claims] 1. A grout injection device in which a check valve made of a flexible material of a taper type in which an upper portion of a set position is spread downward from a discharge port end of the outer tube with respect to the discharge port end,
A grout injection device, wherein a frame for preventing reversal of the valve body is disposed on the valve body of the check valve. 2. The grout injection device according to claim 1, wherein said frame is integrated with a valve body. 3. The grout injection device according to claim 1, wherein said frame is formed separately from the valve body. 4. A non-return valve made of a flexible material of a taper type, wherein a set position above the discharge port end spreads downward from the discharge port end, and is provided below the check valve. A grout injection device characterized in that a diaphragm is passed over the outer tube, a chemical pressurized mixing chamber is formed between the diaphragm and the check valve, and a pressure-responsive valve is interposed in the diaphragm. 5. The grout injection device according to claim 4, wherein said pressure responsive valve has a check valve biased by a pressing spring. 6. The grout injection device according to claim 4, wherein said pressure diaphragm is provided on a slide bracket capable of opening and closing a discharge port of an outer tube. 7. When the instantaneous setting grout or the instantaneous setting grout and the loosening setting grout are alternately injected into the ground, the check valve works effectively even if the pressure in the mixing chamber below the grout supply passage rises. And grouting the ground while maintaining the pressure of the grout.