KR102259376B1 - Grouting device equipped with double helix screw - Google Patents

Abstract

The present invention relates to a continuous grouting device mounted with a screw of a double helix structure, which can further strengthen the ground, comprising: an injection rod for pressing downward and extruding the grouting injected from the outside; a chamber casing inserted into a grouting hole; a tightening nut with a handle; a sealing material for sealing the chamber casing and a sidewall of the grouting hole; and a sealing cap for sealing the chamber casing.

Description

Continuous grouting device equipped with double helix screw

The present invention relates to a grouting apparatus, and to a grouting apparatus capable of reinforcing the ground by continuously injecting grout into the grouting hole perforated in the ground.

In general, the grouting method is a method of reinforcing soft ground or preventing subsidence of structures built on soft ground, by drilling a hole in the submerged ground with cement slurry or chemical liquid, which is a fluid injection material, and injecting grout and solidifying it for a certain period of time. It is a construction method that repairs and reinforces durability and water resistance.

As such a grouting method or device, various known and proposed methods have been proposed.

The proposed technology is equipped with a mixing unit in which the main material and the sub-material are pumped into the pipe, and the main material and the sub-material are mixed with each other in the pipe. The mixing section includes a screw, a cross-type mixing passage, a mixing guide, a mixing stirrer, and forward and reverse screws.

Their structures and detailed functions are slightly different, but the function of mixing the main and sub-materials into one by generating a vortex through the mixing unit as they flow by pressure is the same.

Therefore, by increasing the mixability of the main and sub-materials, the function of the medicinal material could be effectively exhibited, and the drying performance and the ground bearing capacity could be improved.

However, there is a problem in that the capacity of the pump is limited because the mixing property is proportional to the flow rate because it is converted to be mixed by blocking the moving flow by the pressure feeding in a desired direction. Moreover, since the mixing time of the material cannot be controlled, there is a problem that the state of the injected gel cannot be changed according to the state of the ground.

On the other hand, there is a problem in that the grout flows backwards between the exterior and the interior pipe, as well as between the exterior and the ground, depending on the injection pressure of the grout and the ground condition during construction. In other words, it was not possible to sufficiently improve the effect of reducing the permeability because the grout could not be injected at the correct pressure due to the counterflow.

Of course, in order to prevent the backflow of the grout, a packer that is airtightly mounted on the inner tube or the exterior was constructed to block the backflow of the grout.

However, there was a problem that the grout flowing back into the pipe could be blocked, but the grout flowing back between the ground and the pipe could not be blocked.

In order to solve this problem, the present applicant has proposed 'a grouting device with improved injection performance and a grouting method using the same' in the following registered patent 10-1754206 (June 29, 2017).

1 is a cross-sectional view showing a conventional grouting device.

Briefly, "having a predetermined diameter and length, the multi-stage connection-type exterior 10 to which a bit for drilling the ground is fastened at the bottom; is inserted so as to be able to ascend and descend into the interior of the exterior, and the filling material is lowered at the top and bottom A multi-stage connection type inner tube 20 having an inlet 21 for pressure feeding and an outlet 25 for discharging the filling material to be pressure fed into the inner tube 20; a motor 30 connected to the upper end of the inner tube by a gear and rotating the inner tube; the The mixer 40 is fastened so that the forward and reverse screws 41 and 45 that are pressurized downwardly while stirring the filler discharged from the outlet of the inner tube are locked according to the rotational direction; And the outer and inner surfaces of the exterior are injected into the ground Packer 50 to which the outer and inner tube packers 51 and 55 are inserted and fastened to block the backflow to the surface of the filler material;

In the case of this prior art, the performance of the grout is improved by feeding the grout downward while forcibly agitating in the pipe, and the reverse flow of the injected grout is blocked, thereby improving overall workability and quality.

However, the following problems occurred when performing the actual process.

First, there was a problem in that the gap between the blades of the conventional screw was too dense, so that gravel, clay, sandstone, etc. in the ground were mixed with the grout and caught between the blades of the screw. In addition, there was a problem in that a gap was formed between the forward screw and the reverse screw, so that the grout transported downward and the grout transported upward did not smoothly mix with the soil of the ground and accumulated.

Second, due to the high pressure inside the grouting hole, there was a problem in that the grout was leaking back flow. That is, there was a disadvantage that it was difficult to control the internal pressure due to the pressure loss.

Third, when supplying grout from the outside to the supply pump, there was a problem in that it was difficult to control the pressure and check whether a problem occurred because the actual pressure applied inside the grouting hole could not be known. Therefore, depending on the experience or sense of the operator, the pressure was adjusted or the failure was judged.

Republic of Korea Patent 10-1542434 (2015.7.31.) "Continuous injection type grouting device and continuous injection type grouting method using the same" Republic of Korea Patent Registration 10-1754206 (June 29, 2017) "Grouting device with improved injection performance and grouting method using the same"

Accordingly, the present inventor has developed to solve the above-mentioned problems of the prior art, and an object of the present invention is to prevent various gravel and clay from being caught between the blades of a forward screw and a reverse screw, and a double helix having a structure in which agitation work is performed smoothly It is to provide a continuous grouting device equipped with a screw of the structure.

Another object of the present invention is to provide a continuous grouting apparatus equipped with a screw of a double helix structure having a structure capable of blocking the leakage of the grout caused by the backflow of the grout at high pressure inside the grouting hole.

Another object of the present invention is to provide a continuous grouting apparatus equipped with a screw having a double helix structure that can monitor the pressure applied to the inside of the grouting hole by the operator and notify the operator when the working pressure is out of the range.

A continuous grouting apparatus equipped with a screw of a double helix structure according to the present invention for achieving the above object is rotatably provided, inserted into a grouting hole perforated in the ground, and made of a hollow shape, which is injected from the outside an injection rod for extruding the grout by pressing it downward; a chamber casing which is inserted into the grouting hole while forming a hollow shape so that the injection rod is accommodated therein, a male thread is formed on an outer circumferential surface, and a locking protrusion is formed at the bottom thereof; a tightening nut having a hollow shape so that the chamber casing is accommodated therein, a female screw thread is formed on an inner circumferential surface to be screwed with the chamber casing, and having a handle capable of applying a rotational force to an upper end of the outer circumferential surface; a sealing material provided between the lower end of the tightening nut and the locking jaw and expanding by tightening the tightening nut to seal between the chamber casing and the side wall of the grouting hole; and a sealing cap coupled to the upper end of the chamber casing to seal the chamber casing while rotatably accommodating the injection rod; a screw of a double helix structure for reinforcing the ground by injecting grout into the ground is mounted In the continuous grouting apparatus, a forward screw is formed in a double helix of a first forward screw and a second forward screw that pressurizes the grout extruded through the discharge hole to the lower side under the injection rod, and the lower side of the forward screw A reverse screw in which a first reverse screw and a second reverse screw are formed in a double helix for pressurizing the grout extruded through the discharge hole to the upper side are formed, and the first forward screw and the first reverse screw are joined at the first inflection part and the second forward screw and the second reverse screw may be joined to the second bent portion.

Here, the length of one pitch of the forward screw and the reverse screw is preferably at least twice the length of the outer diameter of the injection rod.

And the sealing material may be made of a urethane material.

In addition, an injection port into which the grout is injected is provided at the upper end of the injection rod, and a supply pump for pumping and supplying the grout to the injection port is provided, and a control means is further provided between the injection hole and the supply pump, the control means, A pressure sensor and a flow meter for measuring the supply pressure and flow rate of the grout supplied from the supply pump, and a control panel to sound an alarm when the pressure measured by the pressure sensor is out of the working pressure range so that the operator can be configured to recognize have.

According to the present invention described above, there are the following effects.

In the prior art, the work was performed with the outer casing inserted, but in the present invention, the grout can be injected by removing all the casings and mounting an injection rod.

And since the forward screw and the reverse screw have a double helix structure and have a structure in contact with each other at the inflection part, the agitation within the grouting hole is greatly increased, and since the gap between the screw blades is long, gravel, clay, etc. do not stick .

In addition, since the sealing material is pressurized with a tightening nut and expanded, it is completely sealed with the ground of the grouting hole, so that leakage due to the backflow of the grout does not occur.

In addition, the grout supply pressure can be checked, and the operator can respond quickly because it informs the high or low pressure state.

1 is a cross-sectional view showing a conventional grouting device;
2 is a cross-sectional view showing the structure of a continuous grouting apparatus equipped with a screw having a double helix structure according to an embodiment of the present invention;
3 is a perspective view showing the double helix structure of the forward screw and the reverse screw of the present invention shown in FIG.
4 is a block diagram showing the control means of the present invention shown in FIG.

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

For reference, the description with reference to the drawings is for easier understanding of the present invention, and the scope of the present invention is not limited thereto. And, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

2 is a cross-sectional view showing the structure of a continuous grouting apparatus equipped with a screw having a double helix structure according to an embodiment of the present invention.

The present invention relates to a continuous grouting device equipped with a screw of a double helix structure that can strengthen the ground by inserting and installing it in a grouting hole formed by drilling the ground and injecting the grout into the grouting hole (GH), 100 ), the chamber casing 200 , the tightening nut 300 , the sealing material 400 , the sealing cap 500 , and may be configured to include a forward screw 610 and a reverse screw 620 .

The present invention is installed after drilling the ground by inserting a casing (not shown) with a bit (not shown) mounted on the end and taking out the casing from the grouting hole.

First, the injection rod 100 will be described.

The injection rod 100 is a circular tube inserted into the interior of the grouting hole (GH), the interior is made of a hollow hollow shape.

And the injection rod 100 is rotatably provided so that it can be rotated by a separate rotation driving means 700 .

The rotation driving means 700 includes a frame 710 accommodating a portion of the upper end of the injection rod 100 , a hydraulic press 720 installed on the upper portion of the frame 710 , and the hydraulic press 720 . It may be composed of a driven gear 730 and a driven gear 740 coupled to the upper end of the injection rod 100 and interlocked with the driving gear 730 .

At this time, the hydraulic device 720 means a hydraulic device for generating power by hydraulic pressure, and a hydraulic motor or the like may be used.

Accordingly, the injection rod 100 may be rotationally driven at a predetermined RPM by driving the hydraulic press 720 , or the injection rod 100 may be inserted into the grouting hole or pulled out from the grouting hole.

Of course, it is natural that a sprocket and a chain may be used instead of the driving gear 730 and the driven gear 740 when power is transmitted.

In addition, an injection hole 750 is formed at the uppermost end of the injection rod 100 so as to inject the grout into the injection rod 100 . Grout may be forcibly injected from the supply pump 800 through the injection port 750 , and the injected grout may be pressure-feed downward along the inside of the injection rod 100 .

At this time, the injection hole 750 is formed in a structure capable of injecting the grout regardless of rotation.

On the other hand, discharge holes 110 are formed at regular intervals in the injection rod 100 so that the grout being pressurized can be discharged to the outside.

Preferably, one or more injection rods 100 may be connected to each other to extend the length.

Next, the chamber casing 200 will be described.

The chamber casing 200 is a configuration for fixing and supporting the injection rod 100, and may be formed in a hollow shape.

And the injection rod 100 is accommodated in the interior of the chamber casing (200). That is, it is installed to surround the outer periphery of the injection rod (100).

In addition, the outer diameter of the chamber casing 200 is formed smaller than the inner diameter of the grouting hole (GH) is introduced into the inside of the grouting hole (GH).

A male screw thread 210 is formed on the outer circumferential surface of the chamber casing 200 by a predetermined height so as to be fastened with the tightening nut 300 to be described later.

In addition, at the lower end of the chamber casing 200, a locking jaw 220 extending outwardly is formed to protrude. Accordingly, the outer circumferential surface of the chamber casing 200 is spaced apart from the inner circumferential surface of the grouting hole GH, but the locking jaw 220 may be installed to be in close contact with the inner circumferential surface of the grouting hole GH.

Next, the tightening nut 300 will be described.

The tightening nut 300 is screw-coupled to the chamber casing 200 to compress the sealing material 400 to be described later.

The tightening nut 300 is made of a hollow shape, and is installed so that the chamber casing 200 is accommodated therein.

And the lower end of the tightening nut 300 may be introduced into the grouting hole (GH). That is, the outer diameter of the tightening nut 300 is formed smaller than the inner diameter of the grouting hole (GH).

In addition, a female thread 310 is formed on the inner circumferential surface of the tightening nut 300 to be screwed with the male thread 210 of the chamber casing 200 .

In this case, a handle 320 may be provided at the upper end of the tightening nut 300 to apply a torque to the tightening nut 300 .

Accordingly, when a force is applied to the handle 320 to rotate the tightening nut 300 forward or reverse, the tightening nut 300 may move up and down along the chamber casing 200 .

Next, the sealing material 400 will be described.

The sealing material 400 is disposed between the lower end of the tightening nut 300 and the locking jaw 220 of the chamber casing 200, and may be made of an elastic material that can be compressed or expanded.

The sealing material 400 may have a circular cross-section or a donut shape. Alternatively, it is possible to increase the area in close contact with the inner wall of the grouting hole GH because the cross section is formed in an elliptical or rectangular shape, a track shape, which is vertically long.

Therefore, when the tightening nut 300 is rotated and tightened, the sealing material 400 is compressed up and down and expands laterally to completely seal between the chamber casing 200 and the inner wall of the grouting hole GH. have. That is, it is possible to fundamentally block the backflow of the grout due to the high pressure in the grouting hole GH.

Preferably, the sealing material 400 may be made of a urethane material.

Next, the sealing cap 500 is for sealing the upper end of the chamber casing 200, is made of a hollow shape and is installed to accommodate the injection rod 100 therein.

The inner diameter of the sealing cap 500 is substantially identical to the outer diameter of the injection rod 100, but the injection rod 100 is provided to be rotatable.

At this time, the O-ring 510 may be inserted between the sealing cap 500 and the injection rod 100 to be packed.

And the upper end of the sealing cap 500 may be provided with a flange 520 extending outwardly, and the upper end of the chamber casing 200 may be inserted and coupled to the lower surface of the flange 520 .

Next, the forward screw 610 and the reverse screw 620, which are core technical matters of the present invention, will be described in detail with reference to FIG. 3 together. 3 is a perspective view showing the double helix structure of the forward screw and the reverse screw of the present invention shown in FIG. 2 .

The forward screw 610 is a helical blade formed under the injection rod 100, and is a spiral to transport the grout extruded from the discharge hole 110 with respect to the rotational direction of the injection rod 100 downward. this is formed

And the reverse screw 620 is a spiral blade formed on the lower side of the forward screw 610, and is a spiral to transport the grout extruded from the discharge hole 110 with respect to the rotation direction of the injection rod 100 upward. this is formed

That is, the spiral directions of the blades of the forward screw 610 and the reverse screw 620 are opposite to each other.

In addition, the forward screw 610 is formed in a double helix structure in which the first forward screw 611 and the second forward screw 612 are in the same direction.

Similarly, in the reverse screw 620, the second reverse screw 622 and the second reverse screw 622 are formed in a double helix structure in the same direction.

What is important is that there is no gap between the forward screw 610 and the reverse screw 620, and the structure is in direct contact with each other. To this end, the first forward screw 611 forms a first inflection portion 630 while meeting the first reverse screw 621 , and the second forward screw 612 meets the second reverse screw 622 and the second An inflection portion 640 is formed.

Because of this structure, agitation can be performed much better than in the prior art.

Because, in the prior art, since the forward screw and the reverse screw are spaced apart from each other by a certain distance, an empty space is formed between the two, so there is a problem of delayed stirring or accumulation or stagnation in this space.

However, in the case of the present invention, since the forward screw 610 and the reverse screw 620 are in direct contact with each other, the grout fed downward and the grout fed upward collide at the inflection part and are mixed without accumulation or stagnation. sex is greatly increased.

In addition, since it is a double helix structure, a vortex is generated greatly to increase the mixing property, and the pressure feeding force is also increased to improve the injection into the ground.

In addition, in the present invention, it is preferable that the length of one pitch of the spiral of the forward screw 610 and the reverse screw 620 is more than twice the length of the outer diameter of the injection rod 100 .

Because one pitch of the conventional spiral is formed smaller than the outer diameter of the rod, clay, gravel, sandstone, etc. are mixed with cement and flowed in between the screw blades, so that the grout transfer is delayed. That is, there was a problem in that the stirring was hardly performed. In addition, there was a serious problem that the wings were broken.

Therefore, in the present invention, this problem is solved by increasing the force of the vortex by increasing the spacing of the screw blades.

4 is a block diagram showing the control means of the present invention shown in FIG.

Meanwhile, in the present invention, an injection hole 750 is formed at the upper end of the injection rod 100 to inject the grout.

And a supply pump 800 for supplying the grout to the inlet 750 may be installed.

In addition, it is preferable that a control means 900 is further included between the supply pump 800 and the inlet 750 , and specifically, the control means 900 includes a pressure sensor 910 , a flow meter 920 , and a control panel ( 930) may be configured.

The pressure sensor 910 measures the supply pressure of the grout pumped from the supply pump 800 and supplied to the inlet 750 .

And the flow meter 920 measures the flow rate of the grout supplied from the supply pump 800 .

The measured values measured by the pressure sensor 910 and the flow meter 920 may be displayed on the control panel 930 .

Preferably, when the supply pressure in the control panel 930 is out of the working pressure range, it is possible to notify the operator through an alarm.

For example, when the supply pressure of the grout is 3 kg/cm 2 or more or 2 kg/cm 2 or less, an alarm may be sounded.

If the pressure is too high, the grout is completely injected into the grouting hole (GH), or a lot of air is introduced.

Conversely, if the pressure is too low, the pressure may leak inside the grouting hole (GH) or the condition of the ground may be estimated unexpectedly.

And, since the flow meter 920 can determine the amount of grout actually injected, waste can be prevented.

Although a representative embodiment of the present invention has been described above with reference to the drawings, those skilled in the art to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above content. Therefore, the scope of the present invention should not be limited to the described embodiments, and should be defined by the claims described below as well as the claims and equivalents.

100: injection rod 110: discharge hole
200: chamber casing
210: male thread 220: jamming jaw
300: tightening nut
310: female thread 320: handle
400: sealing material
500: sealing cap
510: o-ring 520: flange
610: forward screw 611: first forward screw
612: second forward screw 620: reverse screw
621: first reverse screw 622: second reverse screw
630: first inflection part 640: second inflection part
700: rotation driving means 710: frame
720: hydraulic press 730: drive gear
740: driven gear 750: inlet
800: supply pump
900: control means 910: pressure sensor
920: flow meter 930: control panel
GH : Grouting ball

Claims (4)

an injection rod which is provided rotatably, is inserted into the grouting hole perforated in the ground, and is made of a hollow shape, and extrudes the grout injected from the outside by pressing it downward; a chamber casing which is inserted into the grouting hole while forming a hollow shape so that the injection rod is accommodated therein, a male thread is formed on an outer circumferential surface, and a locking protrusion is formed at a lower end thereof; a tightening nut having a hollow shape so that the chamber casing is accommodated therein, a female thread is formed on an inner circumferential surface to be screwed with the chamber casing, and provided with a handle capable of applying a rotational force to an upper end of the outer circumferential surface; a sealing material provided between the lower end of the tightening nut and the locking jaw and expanding by tightening the tightening nut to seal between the chamber casing and a sidewall of the grouting hole; and a sealing cap coupled to the upper end of the chamber casing to seal the chamber casing while rotatably receiving the injection rod;
The first forward screw and the second forward screw for press-feeding the grout extruded through the discharge hole to the lower side of the injection rod are formed in a double helix at the lower portion of the injection rod, and the lower side of the forward screw is extruded through the discharge hole A reverse screw is formed in which the first reverse screw and the second reverse screw for pressing the grout upward are formed in a double helix, wherein the first forward screw and the first reverse screw are joined at the first bending portion, and the second forward screw and The second reverse screw is joined to the second bent portion,
An inlet through which the grout is injected is provided at the upper end of the injection rod, and a supply pump for pumping and supplying the grout to the inlet is provided, and between the inlet and the supply pump, the supply pressure and flow rate of the grout supplied from the supply pump are provided between the inlet and the supply pump. A screw of a double helix structure, characterized in that it further comprises a control means including a pressure sensor and a flow meter to measure, and a control panel for the operator to recognize when the pressure measured by the pressure sensor is out of the working pressure range Equipped continuous grouting device. The method of claim 1,
A continuous grouting apparatus equipped with a double helix structure screw, characterized in that one pitch length of the forward screw and the reverse screw is at least twice the outer diameter length of the injection rod. The method of claim 1,
The sealing material is a continuous grouting device equipped with a screw of a double helix structure, characterized in that made of a urethane material. delete

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