KR20040054326A - BGI grouting materials for improvement of the soft ground and apparatus for injecting the grouting materials, and grouting method using the apparatus - Google Patents

Abstract

PURPOSE: A rocket system for injecting grouting materials for the soft ground improvement is provided to prevent the uneven permeation of grouting materials by controlling the permeation pressure properly, and to heighten the strength of the ground and the water cut off efficiency of the ground. CONSTITUTION: The rocket system for injecting grouting materials for the soft ground improvement comprises: an outer pipe member(201) installed on the front of a rod to inject grouting materials and provided with a cylindrical through hole; an inner pipe member(202) interposed to the appointed depth of the outer pipe member(201) to have an appointed interval with the outer pipe member(201) and provided with a longitudinal through hole to feed grouting materials; and a screw member(203) installed into the outer pipe member(201) to stir up grouting materials through the inner pipe member(202) and the outer pipe member(201) and composed of a circular ring located to be adhered closely to the front of the inner pipe member(202), a screw unified with the circular ring and having an X-shaped continuous cross structure as much as the appointed length, and a central bar unified with the screw along the central axial line of the screw.

Description

GI grouting material for improvement of soft ground and tip device for injecting grouting material for injection thereof, and grouting construction method using same {BGI grouting materials for improvement of the soft ground and apparatus for injecting the grouting materials, and grouting method using the apparatus}

The present invention relates to a tip device for injecting grouting material for injection of BGI (Best Grouting Innovation) grouting material and BGI grouting material for soft ground improvement, and a grouting construction method using the same, 333 kg of cement per 1㎥ of BGI grouting material, silicic acid 167, BGI grouting with a special tip device on the rod tip for grouting material injection for BGI grouting material and BGI grouting material consisting of a compounding ratio of 25 kg of BGI-1 (fastening) or 8.33 kg of BGI-2 (terminating). By injecting the ash, the uniaxial compressive strength, which is the strength after grouting, is increased to reinforce the ground, and the grouting material is sufficiently mixed and the loss is minimized to increase the grouting efficiency, improve the order effect, and achieve economical construction. It is to make it.

In the conventional underground injection material injection method for the ground improvement or the composition of the order wall, as shown in Figure 1, the drilling hole of a predetermined depth is usually formed in the ground, and the injection material injection rod (101) is installed in the drilling hole The grouting was performed by injecting the injection material 102 through the rod 101 while raising the rod 101 from the bottom of the excavation hole.

However, the conventional injection material injection method as described above is not able to adjust the curing time arbitrarily to perform a uniform grouting operation according to the operator's experience, so that it is often not meet the soil conditions or injection purposes of the site It is pointed out as a problem.

In addition, there has been a lot of problems in increasing the order of the ground and the strength of the ground while the strength of the ground after grouting is reduced by using more silicic acid than necessary.

The present invention has been made in consideration of the above matters, to prevent the non-uniform penetration of the BGI grouting material during the grouting process by manufacturing a BGI grouting material that minimizes the use of silicic acid, and the mixing ratio of the BGI grouting material It is an object of the present invention to provide a tip device for injection of BGI grouting material and grouting material for improving the soft ground to adjust the hardening time to meet the soil conditions and the purpose of the construction site by artificially adjusting the grouting construction method.

1 is a grouting material penetration state by the conventional grouting material injection method.

Figure 2 is a schematic configuration diagram of a tip device for injecting grouting material for improving the soft ground according to the present invention.

3 is a view showing the structure of a screw member of the tip device of FIG.

Figure 4 is a view showing the whole grouting material injection system using the tip device of the present invention.

Figure 5 is a grouting construction state by the tip device and the grouting material injection method of the present invention.

<Explanation of symbols for the main parts of the drawings>

101 ... Injection Rod 102 ... Injection Rod

201.Exterior member 202 ... Internal member

203 ... screw member 203a ... round ring

203b ... screw section 203c ... center rod

401 ... 3-joint stirrer 402,404,406 ... mixer

403,405,407 ... Grating material pressure pump 408,409 ... Pressure monitoring device

410 ... grouting material injection tube

In order to achieve the above object, the BGI grouting material for the improvement of soft ground according to the present invention is A material or BGI-2 No. 8.33 kg of cement 333kg, silicic acid 167, BGI-1 No. 25 kg per 1㎥ of BGI grouting material. It is prepared by adding water to the blending ratio of the B material which is the kg binder.

The BGI grouting material thus prepared is injected through the tip device for grouting material injection, and the tip device for grouting material injection is

An exterior member installed at a distal end of the grouting injection tube, and having a substantially cylindrical through hole therein;

An inner tube member inserted to the inside of the outer member so as to have a predetermined gap with the outer member and having a longitudinal through hole for conveying the grouting material injected from the outside; And

It is characterized in that it is installed in the outer member in the front position of the inner tube member, and comprises a screw member for agitating different grouting materials respectively injected through the inner tube member and the outer member.

Here, the screw member, the circular ring portion which is located in close contact with the front end of the inner tube member; A screw part provided integrally with the circular ring part and having a continuous cross structure of an X shape by a predetermined length; A central rod is provided integrally with the screw portion along the central axis of the screw portion.

In addition, the grouting construction method using the tip device for grouting material injection for improving the soft ground in accordance with the present invention to achieve the above object,

Mounting the grouting material dispensing tip device at the distal end of the grouting material injection pipe and installing it underground;

Determining the injection amount and injection pressure of the BGI grouting material according to the water injection test result; And

The grouting is performed according to the determined injection amount and injection pressure of the BGI grouting material, and the injection of the BGI grouting material is repeatedly performed a plurality of times and a stoppage, and the grouting is performed upwards while drawing an injection tube installed in the ground at predetermined intervals. Its features are to include.

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

2 is a view showing the configuration of the apparatus BGI grouting material is injected through the tip device for grouting material injection to improve the soft ground according to the present invention.

BGI grouting material is prepared by adding water to a blending ratio of 333 kg of cement, 167 silicic acid, 25 kg of B.G.I-1 (fastening) or 8.33 kg of B.G.I-2 (terminating) per cubic meter of BGI grouting material.

The uniaxial compressive strength of the produced BGI grouting material after 7 days is 25 kg / cm 2 of the fastener grouting material prepared by mixing the cement, silicic acid, water and BGI-1, and the cement, silicic acid, water and BGI The strength of the binder grouting material prepared by mixing -2 is 50 kg / cm 2. At this time, the curing time of the fastener is 3 ~ 9 seconds, the curing time of the binder is 45 ~ 60 seconds.

In addition, the BGI grouting material uses only about two-thirds of silicic acid per cubic meter compared to the conventional one, and increases strength while increasing durability by increasing the amount of unit cement. Such BGI grouting material can be used in silt sand, sand gravel layer, and gypsum layer to be used for reinforcing soft ground, reinforcing river channel structures, and forming bank walls for banks.

2, the tip device for injection of grouting material for improving the soft ground according to the present invention is largely composed of an exterior member 201, an inner tube member 202 and a screw member 203.

The exterior member 201 is installed at the front end of the grouting injection rod, and is provided with a substantially cylindrical through hole therein.

The inner tube member 202 is inserted to the inside of the outer member 201 to a predetermined depth so as to have a gap with the outer member 201, and the inner tube member 202 in the longitudinal direction for the transfer of the grouting material injected from the outside Through-holes are formed.

Four through-holes are installed in the through-holes for conveying A and B materials, which constitute BGI grouting material, including two A material conveying pipes and two B material conveying pipes. The diameter of one tube for conveying material B of 40 mm and 55 mm is 55 mm, and the two total cross-sections of the material conveying pipe of material B are twice as large as the two total cross-sectional areas of material A conveying pipe. The different size of the cross section is to carry out grouting after stirring at the screw member by sending the amount of material B twice as much as the amount of material A at the same time. In addition, it is conveyed by the grouting material pressure pump connected to the pipeline at this time.

As described above, the injection capacity of A and B materials is injected at a ratio of 1: 2 to grout.

The screw member 203 is installed in the exterior member 201 at the front position of the inner tube member 202, and stirs the grouting material of the A and B materials injected through the inner tube member 202 and the exterior member 201, respectively. Do it. Here, as shown in FIG. 3, the screw member 203 is provided integrally with the circular ring portion 203a and the circular ring portion 203a positioned to be in close contact with the front end of the inner tube member 202. It consists of the screw part 203b which has a X-shaped continuous intersection structure by the length, and the center rod part 203c integrally provided with the screw part 203b along the center axis of the screw part 203b.

Then, a process of injecting the BGI grouting material using the grouting material injection tip device of the present invention having the above configuration will be described with reference to FIGS. 2 to 4.

Referring to Figures 2 to 4, first using a rod of a predetermined diameter (for example, diameter 100mm) excavated to a predetermined depth, and then grouting material equipped with the tip device 200 for grouting material injection of the present invention Install the injection tube 410. Then, the injection amount and the injection pressure of the BGI grouting material are determined according to the water test result. Then, grouting is performed according to the determined BGI grouting material injection amount and injection pressure. At this time, the BGI grouting material is a water glass aqueous solution (material A) mixed with silicic acid and water, BGI-1 and a fastener (B1) mixed with cement and water, and a BGI-2 and a solid binder mixed with cement and water. Three types of grouting materials of (B2) are mixed and used, and each of the three grouting materials is prepared in a mixer separated into three compartments, that is, a three-tub stirrer 401, and stirred together to prepare a BGI grouting material. .

The A, B1 and B2 materials supplied from the three-stirrer 401 are respectively injected with the grouting material via the respective mixers 402, 404 and 406 and the grouting material pressure pumps 403 and 405 and 407. Supplied to the tube 410. Material A and B supplied to the grouting material injection pipe 410 (where either B1 or B2 is supplied) are the exterior member 201 and the inner tube member 202 of the tip device 200 for grouting material injection. The inner and outer pipes of the inner pipe member 202 through each of the conveyance is mixed with each other in the interior of the exterior member 201, the screw member 203 is installed. At this time, by the special structure of the screw portion 203b of the screw member 203, the material A and B proceeds while forming a vortex, and the material A and B are evenly mixed at the front end, so that the BGI grouting material is manufactured and grouted.

In this way, evenly mixed BGI grouting material is discharged by consolidating the ground soft ground at a constant pressure in the ground by the pressure of the grouting material pressure pump (403, 405, 407). At this time, the pressure gauges of the pressure monitoring devices 408 and 409 are read to adjust the discharge pressures of the grouting material pressure pumps 403, 405 and 407. That is, the discharge degree of the BGI grouting material discharged into the ground is adjusted by appropriately adjusting the discharge pressure of the grouting material pressure pumps 403, 405, and 407 according to the ground state of the ground, and as shown in FIG. Likewise, it is possible to perform a high quality ground improvement work on the soft ground so that the grouting (G) is uniform.

On the other hand, in the series of the above process, the injection of the BGI grouting material is performed in a bottom-up while drawing the injection tube at intervals of approximately 30-50 cm. That is, the injection tube is put up by 30 to 50 cm from the bottom of the injection hole for each injection step to perform the injection. For each injection step, the injection volume continues until a predetermined injection volume is reached or the injection pressure reaches a threshold of 1.5 to 2.0 times the initial pressure. The injection pressure is in the range of an average of 0 to 5 kg / cm 2, and if the injection pressure rises 1.5 to 2 times or more of the initial pressure, one step is increased. In addition, in the injection method, grouting is carried out with one step of rapidity and stoppage, and grouting is carried out by repeating the suddenness and stoppage again in the next step. The injection speed of the pump is varied from 8 to 18 / min and is based on 18 / min. The injection amount per step is carried out with the ratio of rapid injection and termination to 5: 5. That is, it is carried out at the ratio of rapid settlement (freezing time: 3 to 9 seconds) = 5 and intermediate settlement (freezing time: 45 to 60 seconds) = 5.

As described above, the tip device for BGI grouting material and the grouting material injection for injection thereof and the grouting construction method using the same according to the present invention by the special structure of the screw portion inside the tip device BGI grouting material Agitated evenly and discharged while controlling the discharge pressure appropriately according to the soil condition in the ground, thereby preventing the non-uniform penetration of grouting material and increasing the uniaxial compressive strength by reducing the amount of silicic acid mixed to increase the strength and ordering function of the ground ground. By increasing the mixing ratio of the grouting material artificially, there is an advantage that the curing time can be adapted to the soil conditions and purposes of the construction site.

Claims (7)

Soft, characterized in that it is a BGI grouting material made of cement 333kg, silicic acid 167, BGI-1 No. 25kg and water, or BGI-2 No.8.33kg and water-terminating material per 1m3 of grouting material. BGI grouting material for ground improvement. The method of claim 1, The uniaxial compressive strength of the BGI grouting material after 7 days of quenching material is 25㎏ / ㎠, the curing time is 3 to 9 seconds, the uniaxial compressive strength of 7 days of the binder is 50㎏ / ㎠, and the curing time is BGI grouting material for soft ground improvement, characterized in that 45 ~ 60 seconds. An exterior member installed at a distal end of the grouting injection tube, and having a substantially cylindrical through hole therein; An inner tube member inserted to the inside of the outer member so as to have a predetermined gap with the outer member and having a longitudinal through hole for conveying the grouting material injected from the outside; And Injection of the BGI grouting material for soft ground improvement, comprising a screw member installed in the outer member at the front position of the inner tube member and configured to agitate different grouting materials respectively injected through the inner tube member and the outer member. A tip device for grouting material injection for. The method of claim 3, wherein The screw member is a circular ring portion positioned to be in close contact with the front end of the inner tube member; A screw part provided integrally with the circular ring part and having a continuous cross structure of an X shape by a predetermined length; And Grouting material injection tip device for the injection of the BGI grouting material for the improvement of the soft ground, characterized in that consisting of a central rod unit integrally provided with the screw unit along the central axis of the screw portion. The method of claim 3, wherein The through hole is formed with four tubes for the transfer of the A material and B material constituting the BGI grouting material, the diameter of one tube for A material transfer is 40mm, the diameter of one tube for B material transfer 55mm, which is made by injecting A and B materials at a capacity ratio of 1: 2 by doubling the two total cross-sections to the B material conveying pipes than the two total area of the material A conveying pipes. A tip device for grouting material injection for injecting BGI grouting material. Installing a grouting material dispensing tip device at the distal end of the grouting material inlet pipe and installing it underground; Determining the injection amount and injection pressure of the BGI grouting material according to the water injection test result; And The grouting is performed according to the determined injection amount and injection pressure of the BGI grouting material, and the injection of the BGI grouting material is repeatedly performed a plurality of times and a stoppage, and the grouting is performed upwards while drawing an injection tube installed in the ground at predetermined intervals. Grouting construction method using a tip device for grouting material injection for the injection of BGI grouting material for improving the soft ground comprising a. The method of claim 6, The injection amount per step in the injection amount of the BGI grouting material is carried out at a ratio of rapid settlement (freezing time: 3 to 9 seconds) = 5 and intermediate binder (freezing time: 45 to 60 seconds) = 5. Grouting construction method using tip device for grouting material injection for injection of BGI grouting material for soil improvement.