KR102253152B1 - mortar composition using oyster shell and manufacturing of it, pile construction method using oyster shell - Google Patents

Abstract

The present invention relates to a pile embedding mortar composition using an oyster shell, a manufacturing method thereof, and a pile embedding construction method using an oyster shell, capable of performing pre-treatment of oyster shells more easily and conveniently. According to the present invention, the method of manufacturing the pile embedding mortar composition using the oyster shell includes a primary grinding step, a primary sorting stage, a foreign substance peeling step, a secondary sorting step, a secondary grinding step, and a mortar raw material mixing step.

Description

Mortar composition using oyster shell and manufacturing of it, pile construction method using oyster shell}

The present invention is a pile embedding mortar composition and a method of manufacturing the same, and a pile embedding method using the same. The oyster shell is used to conveniently recycle the discarded oyster shell by removing salinity from the oyster shell in a simple and inexpensive method compared to the prior art. It relates to a mortar composition for embedding a pile, a method for manufacturing the same, and a method for embedding a pile using an oyster shell.

In the pile-buying method of constructing piles in the ground, pile filling materials are filled in the gap between the perforated hole and the outer circumference of the pile.

Such a pile filling material is usually made in a paste state by mixing water with cement or solidifying material.

Usually, the strength of the pile filling material is not high, but the strength of the original ground is satisfied. What is important is the concentration of the paste, that is, the mixing ratio of cement or solidified material and water (w/c: water/cement ratio).

More specifically, since the pile filling material does not have a high desired strength, if a large amount of cement or solidifying material is randomly mixed in order to increase the concentration (slump, workability) to a thick state, economic feasibility decreases. Workability) decreases, causing clogging of pumps and transfer hoses.

The raw material of the pile filling material is usually composed of Portland cement, blast furnace slag cement and water.

The principle of strength development of existing Portland cement is hydration by cement, and Portland cement causes environmental problems due to the elution of carcinogens such as ^{Cr 6+ (hexavalent chromium) heavy metals from water.} Due to material separation, a corresponding re-injection is required.

Blast furnace slag cement uses Portland cement as the main raw material, but blast furnace slag powder is used as an auxiliary raw material to suppress the elution of ^{Cr 6+ (hexavalent chromium).} Material separation occurs and re-injection is required.

In addition, there is a concern that dilution by groundwater and the outflow of the filling material due to the daily water phenomenon may occur, reducing the main surface friction of the pile foundation and reducing the load sharing effect.

In the case of pile filling material using oyster shell, blast furnace slag powder contains the main raw materials, shell powder, fly ash, desulfurized gypsum, etc., and does not use cement, so it is environmentally friendly and does not contain heavy metals and other harmful substances. As there is no phenomenon, secondary injection is unnecessary, which is economical.

Meanwhile, about 400,000 tons of oyster shells, which are wastes from oyster farming, are generated annually in coastal areas in Korea, but only some of them are recycled as raw materials for seeds, calcium, cosmetics, and fertilizers, and more than half of the oyster shells are not recycled and are illegal. It is buried as a cause of soil pollution, or it is left unattended and stacked to cause environmental pollution and civil complaints due to odor.

Moreover, although the quantity of oyster shells recycled as fertilizers accounted for most of the recycled shells, the organic fertilizers produced without completely removing the salinity of the oyster shells accumulated salt in the soil and the resulting reduction in agricultural product yields. The recycled quantity of oyster shells is decreasing.

The chemical composition of the oyster shell is composed of more than 95% CaCO3, and the remaining traces are composed of inorganic substances such as SiO2, MgO, Al2O3, Na2O, and SO3. Oyster shell has an irregular surface area and a large specific surface area, so it has excellent physical properties with excellent adsorption capacity. This characteristic is also the advantage of being able to use the oyster shell as a material such as an adsorbent, but it is a factor that makes it difficult to remove salt contained or attached to the oyster shell when washing with water.

Oyster shells from Park Sinjang, which separate edible oysters, are not easy to completely remove salt.

It is difficult to remove the meat remaining in the shell, and the salt remaining in small oysters, barnacles, and other algae that have not been removed from the outer surface of the shell.

In addition, it is almost impossible to remove the salt below the allowable standard value only by natural washing with rainwater for the shells stacked in a pile of raw shells or primary shredded shells, and partially dried shells. Due to organic matter and salt, it is a complex and expensive situation that must undergo a wastewater treatment process.

The simple water washing method does not completely remove foreign substances attached to the oyster shell and the salt contained in the meat, and the washing water containing a large amount of salt and organic matter has an excessive amount of biological oxygen demand (BOD, COD), which causes wastewater treatment procedures, processes, and costs. It is demanded excessively.

In "Fixed material including sulfuric acid-treated oyster shells and construction method using the same" (Korean Registered Patent Publication No. 10-1801966, Patent Document 1) uses chemicals such as sulfuric acid or hydrochloric acid and repeats the water washing process several times for purity. There is a method of obtaining high oyster shells, but this is limitedly used only in the case of obtaining high-purity ash used in the raw material of cosmetics, and this method also requires complicated equipment and cost for removing organic matter and salt.

In addition, after use, washing water and liquid waste of chemicals are special wastes and are not suitable for recycling a large amount of shells due to high treatment costs.

In the "Method of recycling shells using microorganisms" (Korean Patent Publication No. 10-2202243, Patent Document 2), there is a method of decomposing organic matter by fermenting raw shells through microorganisms and lowering the salt concentration by a certain percentage, but this method In the case of process characteristics, when handling bulky raw shells, the facility becomes large and complicated, and a large amount of liquid microbial fermentation broth is generated, and a lot of time is required for the fermentation process by microorganisms, as well as the drying process before crushing of the scrapped shells. As a result, there is a difficulty in having to go through several stages of processes such as complex equipment in the fermentation process, excessive fermentation period, water washing, and drying.

Therefore, it is difficult to secure landfills in a state where reuse of oyster shells occurring in a large amount is limited, prohibition of dumping at sea, excessive occurrence of dumping costs, difficulty due to reduction of the amount of reused water, environmental damage due to leakage water, environmental pollution, and piled up in the field. In case of leaving, it adversely affects the sanitation and residential environment due to serious odor and pollution.

In addition, the most research and development of the shells as a resource is a technique such as "Method of manufacturing a ground-improving solidified material using oyster shells" (Korean Registered Patent Publication No. 10-0464666, Patent Document 3). It is a method of obtaining quicklime by sintering at high temperature after removing the chlorine. This is a method of generating a large amount of carbon dioxide and consuming a huge amount of resources (fuel) when sintering at high temperature.This method also has a certain ratio of salt concentration. There is a problem in that it must go through the above-mentioned process in order to lower it to

KR 10-1801966 (2017.11.21) KR 10-2202243 (2021.01.07) KR 10-0464666 (2004.12.22)

The present invention is to solve the problems arising from the prior art described above, and not only makes the pretreatment of oyster shells generated in large quantities easier and simpler, but also minimizes the use of water, thereby eliminating the wastewater treatment process of washing water and an ancillary cost required for drying. It is to be able to save money.

In addition, it is intended to maximize the recycling rate of oyster shells by utilizing shell powder containing organic matter and foreign matter generated in the pretreatment process for compost production.

In addition, by pre-treating the oyster shell in a non-baking method, fuel costs are reduced, and the process proceeds without carbon dioxide generation, thereby providing an eco-friendly treatment method.

In addition, it is intended to facilitate the removal of organic matter and salt by allowing the peeling process to proceed after the oyster shell is primarily crushed and selected.

The method of manufacturing a mortar composition for embedding a pile using oyster shells of the present invention comprises: a first pulverizing step of pulverizing the oyster shells (original closed shells) discharged from Park Sinjang; A first sorting step of passing the pulverized product through the first pulverization step through a screen to filter out small organic matter and shell powder having a small particle size to obtain shell pieces having a large particle size; After preparing the inorganic releasing material, the shell pieces are mixed and put into a cylindrical drum with crushing protrusions formed on the inner circumferential surface, and then the drum is rotated for a certain period of time. A foreign matter peeling step of peeling off the attached salt and organic matter; A second sorting step of passing the contents of the cylindrical drum through a sorting net to filter out the peeling material containing salt and organic matter, and to selectively obtain only shell pieces; A second pulverization step of pulverizing the secondly selected shell pieces to obtain fine powder having a particle size of 0.001 to 2 mm; And a mortar raw material mixing step of preparing a mortar composition by mixing cement or solidified material in a residual amount with 10 to 40% by weight of the shell fine powder.

In the above configuration, a peeling and re-mixing step of mixing the organic matter and shell powder filtered in the first screening step, and a release material containing salt and organic matter filtered out in the second screening step; A fermentation step of producing compost by fermenting after adding sawdust and useful microorganisms to the mixture obtained in the peeling and re-mixing step; characterized in that the mortar composition and compost are produced together.

In addition, the foreign matter peeling step and the secondary screening step may include a cylindrical drum 200 having a plurality of wedge-shaped friction protrusions 290 formed therein; A transfer screw 120 through which a shell piece and a peeling material are supplied into the drum 200; A driving body 160 connected to the driving motor 250 to rotate, and rotating the cylindrical drum 200 in contact with the outer circumferential surface of the cylindrical drum 200; An upper support 270 supporting the driving body 160; A lower base 280 is connected to the lower part, is disposed in front of the drum 200, the upper part supports the upper base 270, and a lift 220 that selectively moves up and down the front side of the upper base 270 Wow; The shell pieces and the peeling material discharged from the drum 200 are accommodated therein, and a primary sieve 170 for filtering the peeling material by taking a network structure; The primary sieve 170 and the secondary sieve network 180, which is arranged in succession with the primary sieve 170 and has a more sparse structure than the primary sieve 170, selects the shell pieces of a certain size; , It is characterized in that the foreign matter or salt of the shell piece is peeled off through friction between the peeling material and the shell piece, and the shell piece is selected.

Alternatively, in the foreign matter peeling step, the release material is stored therein, and a transfer screw is installed inside the rotating cylindrical drum 10 to transfer the shell pieces, and the transfer tube 30 is installed, the transfer tube (30) is configured to smoothly contact the peeling material and the shell pieces by taking a shape with an open top inside the cylindrical rotating drum 10, and the discharging side end of the transfer pipe 30 is in the opposite direction of the shell piece progression. Characterized in that, by using a peeling device equipped with a high-pressure spray nozzle that injects high-pressure air, foreign matter or salt from the shell pieces is peeled through friction between the peeling material and the shell pieces, and friction between the high-pressure air and the shell pieces. .

The mortar composition for embedding a pile using the oyster shell of the present invention is characterized in that it is prepared by the above manufacturing method.

In the pile embedding method using the oyster shell of the present invention, in the pile embedding method in which a perforated hole is formed in the ground, a pile filling material is injected into the perforated hole, and then a pile is inserted, the mortar composition is 50 to 65 weight It is characterized by injecting a mortar in which% and the remaining amount of water are mixed as a pile filling material.

According to the present invention, pretreatment of oyster shells generated in large quantities is made easier and simpler, and the use of water is minimized, thereby reducing ancillary costs required for drying without going through the wastewater treatment process of washing water.

In addition, it is possible to maximize the recycling rate of oyster shells by utilizing the shell powder containing organic matter and foreign matter generated in the pretreatment process for compost production.

In addition, by pre-treating the oyster shells in a non-baking method, fuel costs are reduced, and an eco-friendly treatment method is provided by proceeding without generating carbon dioxide.

In addition, organic matter and salt can be more easily removed by allowing the peeling process to proceed after the oyster shell is primarily pulverized and selected.

1 is a photograph showing an oyster shell discharged from Park Shinjang.
Figure 2 is a photograph showing the inner surface of the oyster shell discharged from Park Shinjang.
3 is a photograph showing a state of primary pulverization of oyster shells discharged from Park Shinjang.
4 is a photograph showing a shell piece having a large particle size obtained through the first screening step.
Figure 5 is a photograph showing a shell piece that has undergone a foreign matter peeling step.
6 is a photograph showing a state in which the second pulverization step is in progress.
Figure 7 is a photograph showing the state of the oyster shell according to each crushing and sorting state in the present invention.
Figure 8 is a schematic diagram showing a file embedding method in the present invention.
Figure 9 is a process chart showing the manufacturing process of the mortar composition for embedding a pile using the oyster shell of the present invention.
10 is a schematic cross-sectional view showing an example of a peeling device in the present invention.
11 is a schematic cross-sectional view showing a state in which one side of the peeling device of FIG. 10 is moved upward.
12 is a cross-sectional view showing an example in which a lift is arranged in the peeling device of FIG. 11;
13 is a view showing a peeling state by the peeling device of FIG. 10;
14 is a schematic cross-sectional view showing another example of a peeling device in the present invention.

Hereinafter, a method of manufacturing a mortar composition for embedding a file using the oyster shell of the present invention will be described in detail through the accompanying drawings.

A method of manufacturing a mortar composition for embedding a pile using an oyster shell of the present invention is illustrated in FIG. 9 as an example.

1. 1st grinding step

Crush the oyster shells (original octopus) discharged from Park Shinjang.

1 shows the oyster shells discharged from Park Shinjang, and shows a state in which various foreign substances and organic substances such as barnacles, seaweeds, and ungrown oysters are attached to the outer surface.

FIG. 2 shows a state in which meat (organic matter) remains on the inner surface of the oyster shell in a state where the oysters are peeled.

The pulverization may be performed using a closed-angle pulverizer provided in a conventional Park Shinjang, as shown in FIG. 3.

The closed-angle grinder is broken by passing the oyster shell between a pair of facing rollers so that the oyster shell is broken while passing through the rollers.

When crushing is performed using these two rollers, the oyster shell is crushed into several pieces in the shape of a flat plate, but the size of the oyster shell is formed in various sizes.

However, the gap between the rollers is made larger than the thickness of the oyster shell so that the oyster shell is not crushed too finely.

If the gap between the rollers is excessively narrowed, it is crushed too finely, and peeling in the subsequent peeling process is not performed smoothly.

2. 1st screening step

The pulverized product that has undergone the first pulverization step is passed through a screen to filter out organic matter and shell powder having a small particle size to obtain shell pieces having a large particle size.

At this time, the size of the screen is made of a size of approximately 0.1 to 1 mm in width and length, and it is preferable to filter out small organic matter and shell powder in the first pulverized product.

A shell piece having a large particle size obtained by performing the primary screening step is shown in FIG. 4.

For reference, the filtered organic matter and shell powder are shown in FIG. 7(A).

3. Foreign matter peeling step

After preparing the inorganic releasing material, the shell pieces are mixed and put into a cylindrical drum with crushing protrusions formed on the inner circumferential surface, and then the drum is rotated for a certain period of time. It peels off attached salt and organic matter.

As the inorganic peeling material, massatona, which is an aggregate of sand and fine powder having a large particle diameter, may be used alone, or a mixture of the two may be used.

When the peeling material is inserted into the cylindrical drum, and then the shell pieces are inserted and then the cylindrical drum is rotated, friction between the shell pieces and the peeling material, and the crushing protrusions inside the drum and the friction effect between the shell pieces occurs. Due to the resulting sand blast effect, organic substances, foreign substances, and salts attached to the shell pieces can be peeled off.

A specific example is shown in FIGS. 10 to 13.

In the peeling device shown in the drawing, a cylindrical drum 200 is prepared, and a transfer screw 120 for transferring a shell and a peeling material is connected to one side of the drum 200.

The transfer screw 120 is connected to the drive motor 110.

In addition, the transfer screw 120 is connected to the outlet of the first hopper 130 into which the shell pieces are put and the second hopper 140 into which the peeling material is put.

Meanwhile, a supply side switch 150 is installed between the transfer screw 120 and the drum 200 to control the supply of raw materials into the drum 200.

Inside the drum 200, a plurality of friction protrusions 290 are formed in a wedge shape, and are installed so as to achieve friction through the protrusions 290 in addition to mutual friction of the internal raw materials.

The drum 200 is configured to be rotatable, and for this purpose, a roller or cylindrical gear-type driving body 160 is connected and installed on the outer circumferential surface of the drum 200, and the drum 200 is rotated by the rotation of the driving body 160. It is made to rotate.

Reference numeral '250' denotes a driving motor 250 for rotating the driving body 160.

In addition, some of the driving bodies 160 may be connected to the driving motor 250, and other parts may be configured as idle rollers.

At this time, the driving body 160 is connected to the upper base 270, a lift 220 such as a hydraulic cylinder is installed under the upper base 270, and a lower base supported on the ground under the lift 220 ( 280) can be installed.

At this time, the lift 220 is disposed on the inlet side of the drum 200, and a simple pedestal 210 is disposed on the opposite side.

According to this configuration, the inlet side of the drum 200 is lifted up by the operation of the lift 220, so that the material inside the drum 200 is inclined to move appropriately to the outlet side as necessary. I can.

On the outlet side of the drum 200, a discharge side switch 190 is installed to control the discharge of internal raw materials to the outside of the drum 200.

In addition, at the outlet side of the drum 200, a cylindrical primary sieve 170 having a dense network structure through which the raw material inside the drum 200 is introduced through the discharge side switch 190 is disposed, and the primary sieve 170 Subsequently, a cylindrical secondary sieve 180 having a more coarse network structure than the primary sieve 170 is disposed.

In addition, a primary support tank 230 for receiving particles that have passed through the primary sieve 170 is disposed under the primary sieve 170, and a secondary sieve 180 is provided under the secondary sieve 180. A secondary support container 240 for receiving the particles that have passed through is disposed.

The primary sieve 170 forms a mesh size of 0.1 to 1 mm so that the peeling material containing salt and organic matter is discharged from the primary supporting container 230, and the peeling material obtained here is supplied as the following compost raw materials.

In addition, the secondary sieve screen 180 is formed with a network size of approximately 2 mm in width and length, and small particles that have passed through this network are supplied to the secondary pulverization step.

Large particles that do not pass this network standard may be used as raw materials for low-flow mortar grouting, or may be sorted through a separate pulverization process prior to the second pulverization and subjected to a second pulverization process.

Another example of a peeling device is shown in FIG. 14.

In the separation device of FIG. 15, cylindrical main gears 11 are installed along the outer circumferential surfaces of both sides, and a driving gear 20 engaged with the main gear 11 and connected to the driving motor 21 is provided. 21) is provided with a cylindrical drum 10 that rotates by the operation, and a lifting member 12 is provided inside the cylindrical drum 10 to pump the release material so that the release material can move on the cylindrical drum 10 have.

The lifting member 12 may be installed in the form of a screw on the inner circumferential surface of the drum 10, and may take various other shapes.

In addition, transfer pipes 30 having both ends passing through both ends of the cylindrical drum 1 are disposed.

The transfer pipe 30 takes a fixed state with respect to the rotating cylindrical drum 1, and is connected to the supply hopper 40 at one end of the transfer pipe 30 so that the shell pieces are transferred through the supply hopper 40. (30) It flows into the interior.

The conveying pipe 30 has a conveying shaft 32 and a conveying screw 33 connected to the conveying shaft 32 installed therein, and the conveying shaft 32 is connected to the conveying motor 31.

At this time, the transfer pipe 30 takes a perforated structure or a network structure having a plurality of holes having a size such that the shell pieces do not come out in a portion located inside the cylindrical drum 1.

In particular, the transfer pipe 30 has an open upper portion in the case of a portion located inside the drum 10.

Due to this, the release material falling from the top to the bottom of the drum 10 can fall to the bottom without disturbing the open portion of the top of the transfer pipe 30 and collide with the shell particles seated on the transfer screw 33. .

In addition, the peeling material after colliding with the shell particles falls back to the bottom of the cylindrical drum 10 through the network structure under the transfer pipe 30 as the transfer screw 33 rotates with respect to the transfer shaft 32.

In order to maximize this effect, the transfer screw 33 is also characterized by taking a perforated or network structure of the same standard.

In addition, the opposite end of the transfer pipe extends outside the cylindrical drum 10, and a screen screening net for performing the secondary screening step is installed, or a conveyor 50 having a network structure is installed to have a certain size. It is made so that the above shell particles proceed to the subsequent process.

In addition, a storage box 60 in which salt, organic matter, salt and organic matter that has passed through the net are stored is disposed at the lower portion thereof.

At this time, a high-pressure injection nozzle 70 connected to the compressor 71 is disposed at the opposite end of the transfer pipe to inject high-pressure air in a direction opposite to the direction of travel of the shell piece.

The high-pressure air injected from the high-pressure injection nozzle 70 injects high-pressure air into the conveying pipe 30 in the inside of the cylindrical drum 10 to prevent the release material inside the drum from escaping to the outside. The peeling material strongly strikes the shell particles and increases the peeling effect of organic matter and salt on the surface of the shell particles.

In addition, the structure of supplying high-pressure air through the high-pressure injection nozzle 70 also suppresses consumption of an excessively large amount of the release material.

On the other hand, the reference symbol '80' denotes the release material supply hopper 80 to which the release material is supplied, and the supply of the release material may be made through the inside of the transfer pipe 30.

The transfer pipe 30 has a tube structure in which a portion protruding outside the drum 10 is blocked, so that the peeling material can be smoothly supplied into the drum 10.

4. Secondary screening step

The contents inside the cylindrical drum are passed through a sorting net to filter out the peeling material stained with salt and organic matter, and only the shell pieces are selectively obtained.

Specifically, when the mixture of shell fragments and release material inside the drum is taken out from the inside of the drum and passed through a sieve, the organic matter, salt, foreign matter, shell powder with small particle size, and release material attached to the shell fragments pass through the sieve screen. , Only shell fragments with a large particle size remain in the sieve net.

At this time, the size of the selection net is preferably made of a size of approximately 0.1 to 1 mm horizontally and vertically.

5 shows the shell pieces that have gone through this foreign matter peeling step, and it can be seen that foreign matter and salt have been removed from the surface.

As a result of requesting the component analysis of the shell pieces obtained through the secondary screening step, it was found that the salt content was 1 mg or less per kg, which was suitable for use as a raw material for mortar.

5. Second pulverization step

The second sorted shell pieces are pulverized using a pulverizer as shown in FIG. 6 to obtain fine powder having a particle size of 0.001 to 2 mm.

To this end, after the shell pieces are crushed using a grinder, a third sorting step of sorting the crushed material through a sieving screen may be performed on the crushed shell pieces.

The screening net is divided into about 2 mm in width and length, and particles with a particle size exceeding 2 mm can be used as a raw material for mortar in the low-flow mortar grouting method, or can be re-inserted into a grinder and continuously pulverized until less than 2 mm.

In the above configuration, a peeling and re-mixing step of mixing the organic matter and shell powder filtered in the first screening step, and a release material containing salt and organic matter filtered out in the second screening step; A fermentation step of producing compost by fermenting after adding sawdust and useful microorganisms to the mixture obtained in the peeling and re-mixing step may be further provided.

In this case, it is possible to produce the mortar composition and compost together.

If such a composting process is carried out, it is possible to easily compost by-products without requiring a separate cost for disposal of liquids, organic substances, and shell powders containing salt.

Referring to FIG. 7, first (A) shows small organic matters and shell powders having a small particle size that passed through the sieving screen in the first pulverization step, and FIG. 7 (B) shows the sieving screen in the second screening step. It shows a peeling material stained with salt and organic matter that has passed through,

Figure 7 (C) shows a state in which sawdust is mixed with (A) and (B).

In addition, (D) of FIG. 7 shows the shell pieces that were first sorted, and (E) of FIG. 7 shows the shell powder of less than 2 mm in size that passed through the sieve screening net in the third sorting step, and FIG. 7 Figure (F) of shows shell particles of 2 to 10 mm in size filtered by a screening screen in the third sorting step.

6. Mortar raw material mixing step

A mortar composition is prepared by mixing cement or solidifying material in a residual amount with 10 to 40% by weight of the shell fine powder.

Portland cement and blast furnace slag cement may be used alone or as a cement.

The solidifying material may be composed of fly ash, blast furnace slag, quicklime, etc. alone or in combination.

In addition, trace amounts of admixture, silica powder, fine sand (fine sand) may be added.

Such a mortar composition may be mixed and used in the field, but it is more preferable to use it by mixing and mixing with water at a construction site while pre-mixed for use in a factory.

Hereinafter, a method of embedding a pile using an oyster shell of the present invention will be described.

The pile embedding method using the oyster shell of the present invention, as shown in FIG. 8, uses an auger 1 to form a perforated hole in the ground, and then injects a pile filler 3 into the perforated hole. Insert the stake (2), press fit or put.

At this time, the pile filling material is made of a mortar obtained by mixing 50 to 65% by weight of the mortar composition and the remaining amount of water.

More preferably, the mortar composition is 54.6% by weight, and in this case, the water is 35.5% by weight, and fine grains or other admixtures may be added in the remaining amount.

At this time, the water cement ratio (W/C) should be about 65%.

In the pile burial method, a pile is inserted after drilling and excavation of the ground, and a paste obtained by mixing a certain ratio of water with ordinary cement or solidified material is injected into the gap between the hole diameter and the pile diameter, and then the gap between the pile and the original ground is filled. Filling to increase the friction force on the main surface of the pile.

At this time, when the paste is maintained at a certain concentration (W/C) or more, it fills the space without dissipating to the surrounding ground while filling the gap and has a predetermined strength.

In general, the mixture ratio of cement (solidifying material) and water (W/C) is 60 to 100% by weight, and then the paste is prepared and injected.This ratio is the strength and workability that the paste will have after curing (slump, workability). In consideration of this, it is the concentration that takes into account the case that the groundwater and the empty wall are collapsing in the ground and the soil of the original ground is mixed, and the injected paste is dissipated into the surrounding ground and cannot fill the empty space and becomes an empty wall state.

At this time, if the concentration is low, the strength of the pile decreases as the strength of the pile is weakened compared to the surrounding ground, and when the paste is dissipated to the surrounding ground and voids are formed, an additional process that requires re-injection occurs after one injection. Is easily mixed, and a predetermined function is lost.

On the other hand, if the concentration of the paste is high, the strength after curing increases, thereby increasing the main surface friction of the pile, suppressing dissipation of the paste, and reducing the mixing of groundwater and soil in the ground, improving the function of increasing the main surface friction of the pile.

However, the higher the concentration of cement, the higher the cost and the greater the adhesive force, so when injecting through a pump or hose in the injection process, the workability decreases and clogging occurs, which leads to limitations.

Therefore, considering the workability in the ground while satisfying a certain concentration (slump, workability, cement ratio) and strength, it is economical to construct cement mortar or solidified mortar mixed with powdery aggregate rather than simply mixing cement and water. It is effective in terms of the effect of increasing constructability and friction.

In other words, if the shell-derived fine powder is included as in the present invention, it will be effective in terms of economical efficiency, constructability, and the effect of increasing friction.

1: auger 2: pile
3: File filling material
110: drive motor 120: transfer screw
130: first hopper 140: second hopper
150: supply side switchgear 160: driving body
170: primary sieve screen 180: secondary sieve sieve
190: discharge side switch 200: drum
210: pedestal 220: lift
230: 1st support container 240: 2nd support container
250: drive motor 270: upper base
280: lower support 290: friction protrusion
10: drum
11: main gear 20: drive gear
21: drive motor 12: lifting member
30: transfer pipe 31: transfer motor
32: feed shaft 33: feed screw
40: supply hopper 50: conveyor
60: storage box 70: compressor
71: high pressure injection nozzle 80: release material supply hopper

Claims (6)

In the method for producing a mortar composition for embedding a pile using an oyster shell,
A first pulverization step of crushing the oyster shells (original closed shells) discharged from Park Shinjang;
A first sorting step of passing the pulverized product through the first pulverization step through a screen to filter out small organic matter and shell powder having a small particle size to obtain shell pieces having a large particle size;
After preparing the inorganic releasing material, the shell pieces are mixed and put into a cylindrical drum with crushing protrusions formed on the inner circumferential surface, and then the drum is rotated for a certain period of time. A foreign matter peeling step of peeling off the attached salt and organic matter;
A second sorting step of passing the contents of the cylindrical drum through a sorting net to filter out the peeling material containing salt and organic matter, and to selectively obtain only shell pieces;
A second pulverization step of pulverizing the secondly selected shell pieces to obtain fine powder having a particle size of 0.001 to 2 mm;
Consisting, including; a mortar raw material mixing step of preparing a mortar composition by mixing cement or solidified material in a residual amount with 10 to 40% by weight of the shell fine powder,

The foreign matter peeling step and the secondary screening step,
A cylindrical drum 200 having a plurality of wedge-shaped friction protrusions 290 formed therein;
A transfer screw 120 through which a shell piece and a peeling material are supplied into the drum 200;
A driving body 160 connected to the driving motor 250 to rotate, and rotating the cylindrical drum 200 in contact with the outer circumferential surface of the cylindrical drum 200;
An upper support 270 supporting the driving body 160;
A lower base 280 is connected to the lower part, is disposed in front of the drum 200, the upper part supports the upper base 270, and a lift 220 that selectively moves up and down the front side of the upper base 270 Wow;
The shell pieces and the peeling material discharged from the drum 200 are accommodated therein, and a primary sieve 170 for filtering the peeling material by taking a network structure;
The primary sieve 170 and the secondary sieve is arranged in succession to the sieve 170, consisting of a structure that is more sparse than the primary sieve 170 to select the shell pieces of a certain size; using a separating device configured including a secondary sieve (180); ,
Characterized in that the foreign matter or salt of the shell piece is peeled off through friction between the peeling material and the shell piece, and the shell piece is selected,

Method for producing a mortar composition for embedding piles using oyster shells.
The method of claim 1,
A peeling and re-mixing step of mixing the organic matter and shell powder filtered in the first screening step, and the release material containing the salt and organic matter filtered out in the second screening step;
A fermentation step of producing compost by fermenting after adding sawdust and useful microorganisms to the mixture obtained in the peeling and mixing step; characterized in that further provided to produce a mortar composition and compost together,
Method for producing a mortar composition for embedding piles using oyster shells.
delete delete It is prepared by the manufacturing method of any one of claims 1 to 2, comprising 10 to 40% by weight of the shell fine powder, wherein the shell fine powder has a salt content of 1 mg or less per kg,
Mortar composition for embedding piles using oyster shells.
In the pile embedding method in which a perforated hole is formed in the ground, a pile filler is injected into the perforated hole, and then a pile is inserted,
The mortar composition of claim 5, characterized in that injecting a mortar mixed with 50 to 65% by weight of water and the remaining amount of water as a pile filling material,
Pile buying method using oyster shell.

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