KR101721494B1 - Simultaneous multi-stage pressure grouting apparatus - Google Patents

Abstract

In order to facilitate the penetration of the fire in a certain area within the target ground to be improved or reinforced by the infiltration injection of the fire, the present invention is divided into a certain range of the improvement target area where the infiltration injection conditions are different from each other The present invention relates to a multi-stage pressurized grouting apparatus for uniformly injecting a high-pressure fire into a uniformly pressurized state in a state of isolating a zone of a liquid-phase grout, , The outer diameter of the cross section is smaller than that of the stiffener but has a structural sectional force equal to or greater than that of the stiffener and is provided with a plurality of liquid grout inflow ports for pressurizing the liquid grout into the packer as well as the supply passage of the liquid grout, , A multi-stage pressurized grouting device is completed by connecting a stiffener and a packer mounting portion stiffener to each other, a structure capable of sealing both ends of the packer, and a liquid flow preventing device in which liquid flow grout can be ejected from the inside of the packer And a packer mounting portion stiffener connecting pipe having a plurality of grout jet ports.

Description

[0001] The present invention relates to a simultaneous multi-stage pressure grouting apparatus,

The present invention relates to a static pressure simultaneous multi-stage pressure-type grouting apparatus, and more particularly, to an apparatus and a method for simultaneously infusing and inflating a high- In this multi-stage pressure grouting method, which is intended to uniformly infiltrate a fire with homogeneous pressure while dividing a certain range of different improvement target zones and isolating each zone, the injection pressure control of a single material grout by a single injection port Pressure grouting apparatus having a simple and efficient structure that allows sequential and automatic grouting of grouting multi-stage partitioning by injecting ground by operation of a packer.

In order to stabilize the tunnel section and to secure the safety of the tunnel by the tunnel excavation assisted method, the tunnels for the tunnel reinforcement or the slope reinforcement for the tunnel foundation, the stabilization of the deep excavation ground or the inhomogeneous multi- The general procedure for applying the multi-stage pressurized grouting is broadly classified as follows: [1] drilling a certain section of the ground to be improved or reinforced at a predetermined interval and depth; [2] assembling and inserting a combination of an injection pipe and a stiffener in which a packer is mounted at predetermined intervals in a perforation hole; [3] dividing the ground for grout injection into multi-stage sections by operation of the packer; [4] Multistage compartment: Pressurizing and injecting a liquid grout containing high fire into each divided area; [5] The liquid grout proceeds in the order of penetration, consolidation and curing in the ground.

In this multi-stage pressurized grouting method, the reinforcing material inserted in the ground body body to be improved or reinforced and the ground improvement agent injected with the fire in the surrounding ground are jointed with each other, so that the external force acting on the ground and the displacement inducing element This is a concept that can be used as a resistive soil stress body. It is widely used in various fields as ground stabilization and reinforcement countermeasures. In this process, various methods considering construction efficiency, convenience, economical efficiency, construction quality and reinforcing as a ground reinforcement Devices and methods have been developed and used in various ways.

Conventional methods of multi-stage pressurized grouting have been developed in order to achieve more efficient and high-quality economical construction due to various necessities in the course of each step of the above-mentioned work processes. The following is a brief summary of the existing contents of the existing technology.

In the step of perforating a certain section of the ground to improve or reinforce [1] at a predetermined interval and depth, a method of penetrating the reinforcing material directly into the ground according to the ground condition, And a method in which a combination of an injection pipe and a stiffener equipped with a packer is introduced into the ground. Generally, a through hole is formed by a rod to form a perforation hole, and then an injection pipe and a stiffener However, in the case of the collapsible ground where the excavation wall is not maintained, the multi-layered soil layer lacking the ground self-sufficiency, and the aquifer with a lot of ground water flow, Where it is not possible to insert a combination of an installed injection pipe and a stiffener into the perforation hole, Are inserted directly into the ground and the packers are inserted into the internal space of the stiffener at predetermined intervals to insert the injection pipes. The two types of methods are the combination of the injection pipe and the stiffener And the injection characteristics of the liquid grout are different.

In the case of inserting the reinforcing material into the ground by the direct drilling method in the step of assembling and inserting the injection pipe and the stiffener combination in which the packer is mounted in the perforation hole of [2] at predetermined intervals, Is injected directly into the ground, and then the injection pipe with the packer is inserted into the reinforcement and injected. Therefore, most of the packers do not directly work on the excavation ground but operate in the inner space of the reinforcement. In the case of injecting a combination of an injection pipe and a stiffener equipped with a posterior posterior packer by a rod into the ground through a nozzle installed at regular intervals on the outer peripheral surface of the stiffener, It acts directly on the ground or acts in the interior of the stiffener. This way you can also adjust the output format freely are mainly applied.

In the step of partitioning the ground to be subjected to the liquid grout injection by the action of the packer of [3], the supply of the fluid for operating the packer is performed by a separate fluid other than the liquid grout, which is the ground filler, And the supply system of the fluid for operating the packer is supplied to the different systems of the multi-stage sections partitioned by the grooves to be poured into the liquid grout or integrated into a single system and simultaneously supplied Format is applied.

In the step of injecting the liquid grout mixed with the multi-stage partitioned zonation of [4] into the ground, the liquid grout is supplied to each of the multi-stage zoning subdivisions to be injected, A method in which the liquid grout is sprayed simultaneously to the divided sections through nozzles or holes provided in the perforated pipe or a method in which the movable packers are retracted from the inside of the perforated steel pipe and injected sequentially and stepwise from the front end are used.

However, in the existing multistage pressurized grouting method as described above, when the fluid for operating the packer and the liquid grout for improving the ground are different materials or separate supply systems, a plurality of supply systems Since the multi-stage grouting equipment to be installed in the improvement target site has to be equipped, the structure and assembly of the multi-stage grouting equipment are complicated and multi-stage multi-stage work is required to progress the stepwise construction procedure,

In addition, if there is a difference in the condition that the ground receives the liquid grout by the multi-sectioned division of the infeed target ground, the liquid grout is injected through the hole or nozzle installed in the reinforced material having the constant gap and the standard, And it is difficult to inject static pressure and homogeneous ground reinforcement for each multi -

In the case of the initial operation and solidification of the packer using a feedstock or the artificial control of the operation of the packer by a separate fluid supply system, the pressure of the liquid grout In this case, the liquid grout injection pressure is not maintained until the solidification point and the homogeneous ground improvement is achieved. Is often not achieved.

As described above, the existing multi-stage pressurized grouting is complicated in the structure and system of the construction apparatus, has a problem that multiple works are performed according to the construction steps, the function of the packer may not be maintained according to the variation of the ground condition in the construction process, There is a need for a technique for improving the difficulty of controlling the ground pressure of the liquid grout for each section and the problems caused by the artificial control, the maintenance of the packing function until the solidification of the liquid grout and the maintenance of the liquid grout ground pressure.

[Prior Art Literature]

Document 1: Patent No. 10-0888585 (entitled " Multistage Pressurized Grouting Device and Multistage Pressurized Grouting Method Using the Same)

The present invention provides a method and system for the simultaneous injection of static pressure multi-stage pressure grouting according to the present invention, in which the improvement of the existing methods as described above requires more convenience than the conventional methods, The present invention has been made to solve the above-mentioned problems occurring in the conventional multi-stage press-type grouting apparatus and method, in order to achieve the above object. It is designed to suggest improvement measures and solutions for tasks.

first; In order to solve the problem that the structure and system of construction apparatus are complicated and multiple works are carried out in each construction stage in the conventional multi-stage pressurized grouting method, only the injection pressure management of the single material liquid grout by single injection system, It is necessary to propose a method of applying a static pressure simultaneous injection multi-stage pressurized grouting device having a simple and efficient structure which can be sequentially and automatically injected into a multi-stage partitioning and liquid grouting in the ground,

second; The problem that the function of the packer may not be maintained due to the temporal change and the change of the ground state in the process of pressure injection of the liquid grout is that the expansion of the packer is operated by a separate supply system and fluid pressure, It is not easy to continuously manage the grout during the process of pressure injection in the grout, or due to the fluid pressure which is solidified in a short time, In order to solve this problem, the packing fluid and the grouting liquid grout are used as the same material and supplied in the same system. In order to expand and maintain the packer, The fluid pressure by the liquid-phase grout injected into the liquid- So that the ground is relaxed or the packer is free from the wall, the ground is automatically disturbed by the supply pressure of the liquid grout so that the ground is disturbed and expanded to the relaxed range Therefore, it is necessary to propose a way to maintain multi-stage partitioning of the injection site by the packing function until the pressure grouted liquid grout becomes solid in the ground.

third; In order to form a more homogeneous soil conditioner than the existing method of forming the soil conditioner by spraying the liquid grout to the target soil in the direction perpendicular to the axial direction of the stiffener through the holes or nozzles installed in the reinforcing material in the existing multi- , The liquid grout is injected evenly diagonally around the axially outer circumferential surface of the reinforcing material at the packer mounting portion to pre-fill the space between the stiffener and the fabric hollow wall, and the continuous feeding of the liquid grout by continued injection of static pressure, It is necessary to present a plan for forming the soil improvement agent by making the diffusion distribution of the liquid grout by each zone,

fourth; If there are differences in the condition that the ground condition is different for each divided section and the liquid grout is injected, in order to reinforce the homogeneous ground, it is necessary to control the injection amount by the divided sections of the multi-stage division. In order to solve this problem, it is proposed to supply a single system to the entire section where the liquid grout is divided into the multi-stage section by the space inside the stiffener. In the section where the injection resistance is low due to the pressure injection of the liquid grout for each multi- The same injection pressure is maintained as a whole, so that a homogeneous ground reinforcement is formed in consideration of the ground condition. In comparison with the existing method, artificial control of the ground injection pressure of the grout for each multi- The grout is injected into the ground and solidified. It is necessary to propose a way to improve the convenience of construction and improve the quality of construction by maintaining packer function and liquid grout ground injection pressure up to the point of time.

fifth; Direct penetration of stiffeners by the direct penetration method is useful for collapsible ground, multi-layered soil layer, and aquifers with large flow of ground water after excavation. However, in this case, In this process, the space between the outer circumferential surface of the reinforcing material and the pore formed by the perforation excavation is in a state of being in communication with each other, and the liquid grout is divided into the multi- It is impossible to uniformly improve or reinforce the ground because the infiltration of the grout of the liquid grout is concentrated to the area where the injection is good and the injection condition is good. There is a disadvantage that the grout injection pipe And a reinforcing material is introduced into the packing material so that the packer film can directly act on the fabric wall Since the quality of the liquid grout injection may be deteriorated, it is possible to allow a combination of the injection pipe and the stiffener, which is equipped with a structure in which the packer can directly act on the excavation wall, even in a stratum, It is necessary to present a device and a scheme with a structure.

Sixth; It is necessary to propose measures to reduce the construction time and construction cost by establishing countermeasures for integrated management of multiple injection sites by simultaneously injecting multiple injection lines by integrating injection lines.

According to an aspect of the present invention, there is provided a static-pressure simultaneous multi-stage pressure-type grouting apparatus comprising: a feed passage of a liquid-phase grout; a stiffener having a large outer diameter, A plurality of liquid grout inflow ports for pressurizing the liquid grout into the interior of the packer and having a packer mounted on the outer circumferential surface thereof, A multi-stage pressurized grouting device is completed by connecting a stiffener and a packing member stiffener to each other, a structure capable of sealing both ends of the packer, and a liquid flow prevention device in which liquid flow grout can be ejected from the inside of the packer A combination of a plurality of grout discharge ports and a packer mounting portion stiffener connection pipe,

According to the purpose of construction and the result of the piercing, multi-stage partitioning of the infill ground is carried out according to the location and the number of the packers, which are the combination of the stiffener of the packer installation part and the stiffener connection pipe and the packer membrane, A structure that can be easily solved by the combination of the stiffeners connecting the packers is applied.

The members constituting the multi-stage pressure grouting apparatus according to the present invention are connected to each other to perform a function as a channel for supplying the liquid grout and a ground reinforcement in all the sections in the improvement target ground, Through a liquid grout jetting groove provided on the outer circumferential surface of the packer-side joint pipe installed on both sides, the jet is injected between the outer peripheral surface of the stiffener and the excavating wall on the opposite side of the position where the packer is installed, So that it can be press-fit.

A method of constructing a multi-stage pressure grouting apparatus using a static pressure simultaneous injection according to the present invention comprises the steps of: (S1) forming a perforation hole by drilling a target ground to a predetermined diameter and depth; Step S2) of assembling the co-injection multi-stage grouting apparatus by connecting the packer and the stiffener manufactured according to the construction purpose and the ground structure to a predetermined length and assembling them; Inserting the coinjection multi-stage pressurized grouting device into the perforation hole (S3); Connecting the grout mix to the inlet tube [S4]; A step (S5) in which the liquid grout flows into the inside of the reinforcing material and the interior of the packer membrane by the pressure supply of the grout so as to divide the initial operation of the packer and the infeed range of the target ground; After the initial operation of the packer is completed, the grout is filled into the space between the reinforcing material and the excavating wall through the liquid grout ejection grooves provided on the outer circumferential surface of the coupling pipe at both ends by increasing the liquid grout inflow pressure [S6] A step (S7) of injecting the grout filled in the inner space of the pneumatic wall into the gap to be modified by pressurization of the supply pressure; In the process of press-in grouting of the grout, the loosening of the packer and the loss of the injection pressure are compensated by the grout supply pressure for each of the target ground injection range division sections, so that the function maintenance by the automatic expansion of the packer and the injection of the static pressure of the grout are maintained [ S8]; And a step S9 in which the grout injected per packer and injection section division section is maintained without backflow due to the action of the ground reaction force due to the pressure injection even after the injection of the grout is completed, The entire grouting process [S7] except for the initial grout supply step [S5] for the operation of the packer in the process and the grout injection control by pressurizing with appropriate pressure according to the construction purpose and the characteristics of the improvement target ground, In this process, the working fluid of the packer and the liquid grout injected into the ground are made of the same material and are operated and injected by a single system. In addition to the single injection, In the process of simultaneously injecting a plurality of injection holes by means of the injection holes, In order to maintain the operation and function of the packer and the injection control of the liquid grout for each divided section in the divided section, it is necessary to make the grout proceed automatically and sequentially, and to maintain the condition until the injection grouting is completed The most important feature is to do.

As a means for solving the above-mentioned problems, the packer in the static pressure simultaneous injection multi-stage pressure type grouting apparatus according to the present invention is characterized in that the stiffener 30 and the packer portion stiffener 51 are arranged at predetermined intervals, And by the improvement of the procedure and the method of forming the ground improvement agent or the ground reinforcement by such a device, the increase of the construction efficiency, the quality of the ground improver, and the structural effect as the ground reinforcement Means for improving the existing technology are as follows.

First, it is necessary to use the same material without distinguishing between the working fluid of the packer and the liquid grout for reinforcing the ground, and there is no need for a separate supply system, and only the injection grout of the liquid grout The simple and efficient structure that can be sequentially and automatically performed for partitioning and liquid grout grouting is simplified to simplify the connection process, construction step and construction quality control procedure of grouting pump and supply line,

Secondly, in order to make the functioning of the packer and the ground injection of the liquid grout by the single injection system by the liquid grout, which is a single injection material, in order to construct the combination of the injection pipe and the stiffener equipped with the packer, And the reinforcing material is used as an injection pipe without constructing the reinforcing material separately. According to the ground condition of each injection hole as a result of the perforation, the packer is positioned at a proper interval considering the boundary position of the soil layer structure and the injection conditions When the liquid grout is inserted into the reinforcing material introduced into the ground to be improved, the pressurized liquid grout is preferentially divided into the multi-stage partitioned sections in the pre-stage before the injection into the ground, And is press-fitted into the inner space of the star packer portion to perform a function as a packer working fluid, The liquid grout pressure-injected into the inner space was installed in a plurality of liquid grout outlets so that the liquid grout was ejected from the inner space of the packer part to the excavation wall and the ground by the multi-stage partitioned divided sections after the packer membrane was extended to the excavation wall. The inflow pressure of the liquid grout in the inner space of the packer maintaining the expansion of the packer causes the liquid grout to be injected into the ground and penetrate into the ground, In order to avoid the problem that the function of the packer may not be maintained due to the reduction of the operating range of the packer due to the loss of the pressure inside the packer or the change of the ground condition, The function of the packer is maintained in a linked manner, and the function of the packer The division of the area to be improved by the ground improvement and the distribution by area were made so that the injected liquid grout could be stabilized.

Third, the flow grout installed at the inflow portion of the liquid grout of the packer installed in each multi-stage partitioned zone is provided with a counterflow preventing device, and the liquid grout passing through the counterflow preventing device installed in each divided zone Ensure that concentration to other areas does not occur, but the inflow resistance of the liquid grout is low and the amount of injection is large for areas with large voids, So that the dispensing infusion can be controlled automatically. And the ground reinforcement was uniformly applied over the whole area of the improvement target.

Fourth, the operation of the packer and the inflow of the liquid grout into the ground are carried out in the inside of the packer. Through the holes or nozzles formed in the reinforcing material, which is generally used in the conventional multi-stage pressure grouting, The liquid grout is sprayed in such a direction as to preferentially fill the space between the outer circumferential surface of the reinforcing member and the excavating wall by the means for concentrating and charging the liquid grout for each injection section dividing section , The pressure can be gradually injected into the ground at each section in the multi-stage partitioned section by the packer by the pressurization of the continuous supply pressure of the liquid grout. Dynamic pressure injection room to dismantle array structure More it was to be achieved homogenization of soil improvement material.

fifth; Direct penetration of stiffeners by direct penetration method is useful for collapsible soil, multi-layered soil layer, and aquifers with large flow of ground water after drilling, but the damage of packer and penetration directly in ground Because of the difficulty of the stiffener, the packing is inserted in the stiffener after inserting the packer inside the stiffener. In this case, the partition of the stiffener by the packer and the division of the liquid grout are performed in the inner space of the stiffener. The space between the outer circumferential surface of the reinforcement and the space formed by the perforation excavation is in a state of being in communication with each other. According to the ground conditions, it is not possible to manage the divided injection of the liquid grout by the section divided into the multi- Since the infiltration of the ground is concentrated, it is impossible to uniformly reinforce the infiltration site of the reinforcement. Therefore, a structure and a method may be applied in which after the excavation by the casing drilling, the packing material is inserted into the internal space of the casing at a predetermined interval, the casing is pulled out, A process of inserting a plurality of packers having a plurality of packers at predetermined intervals in a hollow casing penetrated into the ground to maintain the excavation wall, and a method of inserting a reinforcing material into the hollow casing, When the injection is started after the casing is pulled out by applying the structure which is made by adjusting the outer peripheral diameter of the part where the packer is mounted within the range where the sectional force loss does not occur in the entire region of the stiffener, the packer film directly acts on the air wall by the pressure supply of the liquid grout So that the multi-stage partitioning injection of the injection ground can be effected effectively. The government said.

Sixth; In the present method in which the liquid grout supply pressure is injected through the perforations or nozzles provided in the perforated pipe reinforcement in each of the divided sections, the difference in the jet pressure according to the arrangement type and number of the nozzles, In order to increase the efficiency of construction, it is necessary to operate a number of grout pumps and to perform an artificial management for each gravel section Therefore, the time required for the construction is long, and as a result, this is a factor of increase in the construction cost. Therefore, in the multi-stage pressure grouting device for simultaneous injection of static pressure according to the present invention and the method thereof, Due to the characteristics of the method, the supply pressure of the liquid grout is kept below a certain range Even if multiple injection holes are simultaneously injected in parallel by using a large-capacity liquid grout extrusion pump, the liquid grout is automatically and sequentially injected into the grout pump at a pressure lower than the pressure to be injected into each zone of each multi- Therefore, it is possible to reduce the construction time and the construction cost by integrating the injection amount by the simultaneous multiple parallel injection by integrating the injection line of the whole injection site. At this time, the apparatus for recording the amount of injection applied a bidirectional flow recording apparatus so that the actual amount of the amount injected into the ground was correctly recorded.

As described above, the static pressure simultaneous injection multi-stage pressure type grouting apparatus according to the present invention has the following effects.

First, the present invention can be applied to the operation of a packer function by simultaneous static pressure injection through a single injection system using a single-material liquid-phase grout, the construction of a multi-stage partitioning step for a target soil inflation range and a ground injection of a liquid grout for each multi- The construction progress is easy, and the homogeneity of the construction quality, the efficiency of the construction speed, the economical efficiency of construction, and other incidental expenses are reduced.

Second, the present invention has a structure in which the pressure state of the liquid grout introduced into the packer operating the packer is always maintained at a pressure equal to or higher than the pressure at which the liquid grout is injected into the ground, The packer operating range is automatically expanded by the grout supply pressure as necessary such as the response to the ground condition, and the liquid grout pressurized into the ground is provided with the multi-stage divided partitioned check valves for preventing backflow of liquid grout. It is not possible to flow backward or to leave the injection range except that it is injected statically into the cavity in the body by the action of the packer closing the injection section with a pressure equal to or higher than the inflow pressure in the liquid grout ground, In addition to the injection process of the liquid grout, the liquid grout injected into the ground is consolidated It is possible to maintain the reforming target compartment range and maintain the static pressure injection effect in all the improvement target compartments without loss of the packer working fluid pressure and deterioration of the packer function up to the point of time. There is an advantage in that the phenomenon that the reformer forming standard due to the ground reaction force is reduced until the appearance of the cementation is prevented.

Thirdly, according to the present invention, after the injection partitioning by the packer is performed, the ground injection of the liquid grout is performed through the liquid grout ejection grooves provided on the outer circumferential surface of the connecting portion of the packer portion stiffener located at both ends of the packer, The present method of injecting the liquid grout by disturbing the ground through the holes or nozzles dispersed in the stiffener because it is injected in the axial direction outer circumferential surface and in the direction of the clearance of the excavating wall, It is possible to form an integrated and homogeneous soil remediation body in all the sections.

Fourthly, the present invention is based on the fact that since the supply amount of the liquid grout is large due to a weak layer having small grout soil injection reaction force among the improvement target ground injection range sections, the grout supply amount is large, And it is advantageous in that the static pressure injection by the pressure is performed and the homogeneous ground reinforcement is performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a static pressure simultaneous injection multi-stage pressure type grouting apparatus according to the present invention,
FIG. 2 is a partial enlarged view of the static pressure simultaneous injection multi-stage pressure-type grouting apparatus of FIG. 1;
3 is a schematic view showing a process in which the liquid grout flows into the ground in the static-pressure simultaneous-feed multi-stage grouting apparatus of FIG. 1,
FIG. 4 is a schematic cross-sectional view of another embodiment of a static pressure simultaneous injection multi-stage pressure-type grouting apparatus according to the present invention,
5 is a schematic view showing the use state of the static-pressure simultaneous-injection multi-stage pressure-type grouting apparatus of another embodiment of FIG.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic sectional view of a static pressure simultaneous injection multi-stage pressure type grouting apparatus according to the present invention, and FIG. 2 is a partial enlarged view of the static pressure simultaneous multi-stage pressure type grouting apparatus of FIG.

As shown in FIGS. 1 and 2, the static pressure simultaneous injection multi-stage pressure type grouting apparatus according to the present invention includes:

The inner tube 100 and the outer tube 102 are formed of a double tube having an outer tube 102 at a certain distance from the inner tube 100. The inner tube 100 and the outer tube 102 are spaced apart from each other by a predetermined distance, A packer-mounting-portion stiffener 51 having a negative-liquid-grout inlet 52 for discharging the liquid-phase grout through the packer-portion liquid-grout inlet 52;

The inner tube 104 and the inner tube 104 are spaced apart from each other by an outer tube 106. The inner tube 104 and the outer tube 106 are connected to each other by a stopper member And a liquid grout outlet 42 is provided at a predetermined interval in the outer tube 106 so that the inner tube 100 of the packer mounting portion stiffener 51 and the end of the outer tube 102 A first packer mounting portion stiffener connecting pipe 41 connected to the outer pipe 106 to discharge the liquid grout discharged through the packer portion liquid grout inlet 52 of the packer mounting portion stiffener 51 to the discharge hole of the outer pipe 106, ;

Wherein an end of the inner tube (108) and an end of the outer tube (110) are connected to each other through a stopper member (108) and an inner tube (108) And a liquid grout outlet 42 is provided at a predetermined interval in the outer tube 110 so that the inner tube 100 of the packer mounting portion stiffener 51 and the end of the outer tube 102 A second packer mounting portion stiffener connecting pipe 43 connected to the outer pipe 110 for discharging the liquid grout discharged through the packer portion liquid grout inlet 52 of the packer mounting portion stiffener 51 to the discharge hole of the outer pipe 110, ;

A first packer mounting pipe (53) installed at one side of the outer surface of the outer pipe (106) of the first packer mounting portion stiffener connecting pipe (41);

A second packer mounting pipe (57) installed at one side of the outer surface of the outer pipe (106) of the second packer mounting portion stiffener connecting pipe (43);

The outer surface of the first packer mounting pipe 53 and the outer surface of the second packer mounting pipe 57 are connected to each other by the liquid grout discharged through the packer part liquid grout inlet 52 of the packer mounting part stiffener 51 A bulging packer membrane 54;

A packer membrane binding band 55 for binding the first packer mounting tube 53 and the packer membrane 54 and the second packer mounting tube 57 and the packer membrane 54;

Wherein the inner pipe (112) and the outer pipe (114) are provided at a predetermined distance from the inner pipe (112), the outer pipe (114) being provided on the outer surface of the blocking member of the first pipe- A first reinforcing member 30 for supporting the first packer mounting portion stiffener connecting pipe 41;

And a second pipe provided with an inner pipe (116) and an outer pipe (118) at a predetermined distance from the inner pipe (116). The outer pipe (118) A second reinforcing member 31 for supporting the second packer mounting portion stiffener connecting pipe 43;

And a liquid grout backflow prevention shutoff valve (56) installed in the inner pipe (104) of the first packer mount stiffener connection pipe (41) to prevent the liquid grout from flowing back to the outside.

The operation of the static pressure simultaneous injection multi-stage pressure type grouting apparatus according to the present invention constructed as above will be described with reference to FIG.

First, the static pressure simultaneous injection multi-stage pressure type grouting apparatus according to the present invention is placed in the perforation hole formed in the ground.

The hose (not shown) installed in the grout pump (not shown) is connected to the first piper mounting stiffener connecting pipe 41 of the multi-stage pressure-type grouting apparatus, And is installed in the valve 56.

The liquid grout backflow prevention shutoff valve 56 sends the liquid grout from the hose into the inner tube 100 of the packer mounting portion stiffener 51, as shown in FIG. 3 (a).

A portion of the liquid grout that has entered the inner tube 100 of the packer mounting portion stiffener 51 is formed to face the inner tube 100 and the outer tube 102 of the packer mounting portion stiffener 51 at regular intervals The liquid grout is discharged to the packer membrane 54 through the packer part liquid grout inlet port 52 and a part of the liquid grout that enters the inner tube 100 of the packer mounting part stiffener 51 passes through the second packer- Is discharged into the inner tube (108) of the discharge tube (43).

3 (b), the packer membrane 54 is swollen by the liquid grout introduced into the packer membrane 54, and the liquid grout flows into the liquid grout of the first packer mounting portion stiffener connection pipe 41 And is discharged to the outside through the liquid grout spout 42 of the first packer mounting portion stiffener connection pipe 41 as shown in FIG. 3 (c).

3 (c), the liquid grout flows into the liquid grout spout 42 of the second packer mounting portion stiffener connecting pipe 43 and flows into the liquid grout spout 42 of the second packer mounting portion stiffener connecting pipe 43, (42).

The operation of the static pressure simultaneous injection multi-stage pressure type grouting apparatus according to the present invention constructed as described above will be described in more detail.

A perforation hole is formed by perforating the target ground to a certain diameter and depth.

Then, it is standardized to a predetermined length according to the purpose of construction and soil properties, and a packer and a reinforcing material, which are manufactured, are connected to each other to assemble a static pressure simultaneous multi-stage pressure type grouting device.

Then, the static pressure simultaneous injection multi-step pressure type grouting device is inserted into the perforation hole.

After connecting the grout mixer and the inlet tube, the liquid grout is introduced into the reinforcement material and the packer membrane by the pressure of the grout so that the initial operation of the packer and the compartment of the target area are performed.

After the initial operation of the packer is completed, the grout is filled into the space between the reinforcing material and the excavating wall through the liquid grout ejection grooves provided on the outer peripheral surface of the coupling pipe at both ends by the rise of the liquid grout inflow pressure, So that the grout filled in the inner space of the pore wall is injected into the pore of the target to be modified by the pressure of the supply pressure.

In the course of performing the ground indentation of the grout, the loosening of the packer and the loss of the injection pressure are corrected by the grout supply pressure for each of the target ground injection range dividing sections so that the function maintenance by the automatic expansion of the packer and the injection of the static pressure of the grout are maintained .

After the injection of the grout is completed, the grout injected into the packer and the injection section divided sections until the solidification is maintained by the action of the ground reaction force due to the pressure injection.

In the course of the above-mentioned construction step, the entire process other than the step of supplying the initial grout for the operation of the packer, the step of controlling the grout injection by pressurizing the grout according to the construction purpose and the characteristics of the ground to be improved, In this process, the working fluid of the packer and the liquid grout injected into the ground are made of the same material and are operated and injected by a single system. In addition to the case of individual injection of the injection hole In the course of the simultaneous injection of multiple injection holes by a single system, the operation of the packers and maintenance of the function of the packers and the injection management of the liquid grout for each multi-stage division are automatically and sequentially performed for each injection hole, And until the grouted grout is cured And to maintain the health of the mouth until the time is completed.

4 is a schematic cross-sectional view of another embodiment of the static pressure simultaneous injection multi-stage pressure grouting apparatus according to the present invention.

As shown in Fig. 4, in the static pressure simultaneous injection multi-stage pressure-type grouting apparatus of another embodiment,

A packer mounting portion stiffener connecting pipe 51 'having a liquid grout jet port 42 at a predetermined interval on the outer surface of the pipe;

A liquid grout injection pipe 60 installed at an end of the connecting pipe 51 'of the packer mounting portion stiffener;

A liquid grout backflow prevention device 66 installed at an end of the liquid grout injection pipe 60 to prevent the liquid grout from flowing back to the outside;

A first packer mounting pipe 53 installed on one side of the outer surface of the connecting pipe 51 ';

A second packer mounting pipe (57) installed at one side of the outer surface of the outer pipe (106) of the second packer mounting portion stiffener connecting pipe (43);

A first liquid grout outlet 62 provided between the connecting pipe 51 'and the first packer mounting pipe 53;

A second liquid grout jet port 63 provided between the packer mount stiffener connection pipe 51 'and the second packer mount pipe 57;

The outer surface of the first packer mounting pipe 53 and the outer surface of the second packer mounting pipe 57 are connected to the liquid grout discharged through the liquid grout outlet 42 of the connecting pipe 51 ' A packer membrane 54 which is swollen by the packing member 54;

And a packer membrane binding band 55 for binding the first packer mounting tube 53 and the packer membrane 54 and the second packer mounting tube 57 and the packer membrane 54.

The operation of the static pressure simultaneous injection multi-stage pressure type grouting apparatus of another embodiment configured as above will be described with reference to FIG.

First, the static pressure simultaneous injection multi-stage pressure type grouting apparatus according to another embodiment of the present invention is placed in the perforated hole formed in the ground.

The hose (not shown) provided in the grout pump (not shown) is installed in the liquid grout backflow prevention device 66 installed in the liquid grout injection pipe 60 of the static pressure simultaneous injection multi-stage pressure type grouting device.

The liquid grout backflow prevention device 66 sends the liquid grout from the hose to the packer mounting stiffener connection pipe 51 '.

A part of the liquid grout that has entered the packer-mounting-portion-stiffener connection pipe 51 'is discharged to the packer film 54 through the liquid-phase grout outlet 42. At this time, the packer film 54 is swollen and the liquid grout is discharged to the outside through the first liquid grout spout 62 and the second liquid grout spout 63.

10; Grout pump
20; Grout injection connection system Grout inlet
30; reinforcement
41; Packer mounting section stiffener connector
42; Liquid grout outlet
51; Packer mounting section stiffener
52; Packer part Liquid grout inlet
53; Packer mounting tube
54; Packer membrane
55; Packer membrane binding band
56; Liquid grout backflow shutoff valve
60; Liquid grout injection tube
62; Liquid grout outlet
66; Liquid grout backflow prevention device
67; Liquid Grout Injection Tube Closure
(a); Inflow of liquid grout stiffener by injection
(b); Inflow of liquid grout into the inner space of packer membrane and expansion of packer membrane and adhesion to excavation wall
(c); After the expansion of the packer membrane and the adhesion of the air wall, the liquid grout in the space inside the packer membrane is ejected into the ground through the liquid grout outlet by the internal pressure.

Claims (3)

The inner tube 100 and the outer tube 102 are formed of a double tube having an outer tube 102 at a certain distance from the inner tube 100. The inner tube 100 and the outer tube 102 are spaced apart from each other by a predetermined distance, A packer-mounting-portion stiffener 51 having a negative-liquid-grout inlet 52 for discharging the liquid-phase grout through the packer-portion liquid-grout inlet 52;
Wherein an end of the inner pipe (104) and an outer end of the outer pipe (106) are connected to the stopper member (106) by a predetermined distance from the inner pipe (104) And a liquid grout outlet 42 is provided at a predetermined interval in the outer tube 106 so as to communicate with an end of the inner tube 100 and the outer tube 102 of the packer mounting portion stiffener 51, A first packer mounting portion stiffener connecting pipe 41 for discharging the liquid grout discharged through the packer portion liquid grout inlet 52 of the packer mounting portion stiffener 51 to the discharge hole of the outer pipe 106;
Wherein the end of the inner tube (108) and the end of the outer tube (110) are connected to the blocking member And a liquid grout discharge port 42 is provided at a predetermined interval in the outer pipe 110 so as to be communicated with an end of the inner pipe 100 and the outer pipe 102 of the packer mounting portion stiffener 51, A second packer mounting portion stiffener connecting pipe 43 for discharging the liquid grout discharged through the packer portion liquid grout inlet 52 of the packer mounting portion stiffener 51 to the discharge hole of the outer pipe 110;
A first packer mounting pipe (53) installed at one side of the outer surface of the outer pipe (106) of the first packer mounting portion stiffener connecting pipe (41);
A second packer mounting pipe (57) installed at one side of the outer surface of the outer pipe (106) of the second packer mounting portion stiffener connecting pipe (43);
The outer surface of the first packer mounting pipe 53 and the outer surface of the second packer mounting pipe 57 are connected to each other by the liquid grout discharged through the packer part liquid grout inlet 52 of the packer mounting part stiffener 51 A bulging packer membrane 54;
A packer membrane binding band 55 for binding the first packer mounting tube 53 and the packer membrane 54 and the second packer mounting tube 57 and the packer membrane 54;
Wherein the inner pipe (112) and the outer pipe (114) are provided at a predetermined distance from the inner pipe (112), the outer pipe (114) being provided on the outer surface of the blocking member of the first pipe- A first reinforcing member 30 for supporting the first packer mounting portion stiffener connecting pipe 41;
And a second pipe provided with an inner pipe (116) and an outer pipe (118) at a predetermined distance from the inner pipe (116). The outer pipe (118) A second reinforcing member 31 for supporting the second packer mounting portion stiffener connecting pipe 43;
And a liquid grout backflow prevention shutoff valve (56) installed in the inner pipe (104) of the first packer mount stiffener connection pipe (41) to prevent the liquid grout from flowing back to the outside. Grouting device.
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