KR100563995B1 - Unstable ground base propulsion constructionCFT pipejacking and propulsion method and devices that use continuous freezing and thawing propulsion method of construcion - Google Patents

Abstract

The present invention is a continuous method, by applying the freeze thaw method used as an auxiliary method of the propulsion work using the excavation device with a freezing and thawing device so that the propulsion work can be safely carried out at a low additional cost even when the leading ground is unstable The present invention relates to a self-reliant ground propulsion method (CFT propulsion method) and a device using a continuous freeze thaw method using a forward lead freeze thaw method.

Freeze propulsion method. Freeze Steel Pipe Propulsion Method. Steel pipe pressurization method. Freezing steel pipe. Leading Promotion Office. Multilevel Hydraulic Jack

Description

Unstable ground base propulsion construction (CFT pipejacking and propulsion method) and devices that use continuous freezing and thawing propulsion method of construcion}

1 to 5 conventional photographs of various propulsion methods

Figure 6 overall view of the self-reliable ground propulsion device (CFT propulsion) using the continuous freeze thaw of the present invention

7 is a detailed diagram of the self-reliable ground propulsion device (CFT propulsion) the first step (freezing steel pipe promotion) using the continuous freeze thawing of the present invention

8 is a detailed view of the second step (leading ground freezing process) of the self-reliable ground propulsion device (CFT propulsion) using the continuous freeze thawing of the present invention

9 is a detailed view of the third self-reliable ground propulsion system (CFT propulsion) using the continuous freeze thawing of the present invention (leading ground thawing and steel pipe propulsion process)

Figure 10 is a front view of the freeze thaw of the present invention

11 is a front view of the propulsion ship conduit of the present invention

12 is a detailed view of the back of the propulsion conduit of the present invention

Figure 13 Detail view of the freeze thawing oil steel tube of the present invention

14 is a detailed view of the freeze thaw oil steel pipe of the present invention bound to the propulsion lead pipe

Figure 15 is a detailed view of the multi-stage hydraulic jack support wall of the present invention

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

Freeze thawing oil pipe (1), freeze thawing oil hole (2), multi-stage hydraulic jack (7), front cylinder (8), rear cylinder (9), hydraulic jack support wall (11), freeze thawing steel pipe support (12) , Freeze thawing oil steel tube head (14), freeze thawing oil steel tube body (15), freeze thawing oil steel tube stopper (16), hydraulic jack reaction wall for direction correction (19), hydraulic jack for direction modification and its cylinder (20) , Hydraulic hose 21, reaction force wall 22, hydraulic jack 23, cylinder 24, propulsion auxiliary pipe 25, rail 26, hydraulic unit 27, liquefied nitrogen storage tank 30, valve (31, 36, 37), freezing and thawing pipe (33), compressed air pipe (34), mixer (35), hot air supply (40), air compressor (41), triangular support wall (45), rivet Joint (46), freeze protection steel plate (50), rail (60), rubber packing (70), A: road, B: soil, B-1: frozen soil, B-2: thawed soil, C: propulsion diagram Pipe, D: propulsion pipe, E; forwarding device, F: lead ground to be promoted

The present invention relates to a self-reliant ground propulsion method (CFT propulsion method) and a device using the continuous freeze thaw method, when described in detail, the present inventors apply the freezing method used as an auxiliary method of the propulsion project unstable propulsion leading ground Continuous freezing to ensure safe propulsion even at low additional cost. The present invention relates to an independent unstable ground propulsion method using a thawing method and a device thereof. The present invention relates to an independent unstable ground propulsion method using a freeze thaw method, which is called the CFT propulsion method.

In recent years, the concentration of population and economic centers has accelerated around large cities, and the classification of administrative districts in Korea has become widespread. The necessity of three-dimensional use of underground space is rapidly increasing for various pipelines directly related to economic life such as sewerage, communication, electricity, and city gas.

In the case of domestic, so far. Most of pipeline construction such as sewer, communication, electric power, city gas performed by open construction method. However, in order to bury pipelines by using excavation methods in urban areas, traffic obstacles are not only large, but also the easy opening and digging of roads due to various civil complaints is increasingly severely regulated. In particular, there are strict regulations on the method of laying excavation in widespread roads, busy streets, dense and adjoining areas, and pipeline construction such as vehicle-only roads, highways, railroads, dikes, and river crossings. There is a situation. In the case of pipeline construction, which is newly constructed due to the increase of underground buried materials, the construction of deep underground underground is required. Due to the change of construction environment, pipeline construction by propulsion drilling method is occupying a lot of market share in Korea.

In the case of foreign countries, the semi-propelled propulsion method is mostly used for the unstable ground propulsion work where the stability of the leading ground is not secured at the time of construction by the general propulsion method. Injection method, freezing method, groundwater level reduction method, indentation method are used. Here, I will describe it in two ways: propulsion method and auxiliary method.

As shown in Fig. 1, the propulsion method is a nisu-hydraulic method, which is a type of closed mechanical shield, which has partition walls between the shields and fills the water on the shield side, which is higher than the natural water pressure. Excavation is carried out while maintaining the independence of the shield by the action of water pressure and Mat-film, and the soil is sent together with the mud water through the pipe to the water treatment plant to separate the soil and water. Nisu containing the separated fine particles is sent back to the shield for circulation. The advantage is that the propulsion speed is fast because the propulsion work is continuous, the remnant conveyance is transported through the pipe, and the labor saving effect is large because the machine excavation, and the advancement of the soft ground and aquifer ground is also needed, except for the arrival base. Almost no work, the working environment is good by working under atmospheric pressure, and it is safe because the shield and propulsion pipe are separated by bulkhead. Disadvantages are that the shield is difficult to manage due to the water pressure, the land is needed because of the water treatment, the facility cost of semi-shielding machine and the water treatment facility is expensive, and the general propulsion method It is weaker than obstacles, and it is difficult to prevent the collapse of the ground in the absence of clay in the coarse sand and sand gravel layer.

Auxiliary method is chemical injection method (grouting method). It can be divided into groundwater level reduction method, indentation method and freezing method.

When the propulsion method is carried out in viscous soil saturated with water, sand or gravel layer under pressure, the excavation site becomes independence, which makes work difficult and in some cases causes labor accidents. In addition, the ground is alleviated by water leakage at the excavation site or the back of the mud, which may cause inconsistency of the propulsion pipes, as well as damage the surrounding structures, surrounding structures, and underground buried pipes. Therefore, it is necessary to implement a proper auxiliary method to facilitate smooth photographing.

In the chemical liquid injection method (Grouting method) (see Fig. 2), in the case of viscous soils, it has the effect of independence of the membrane due to the increase of the strength of the soil, and in the case of sandy soils, the groundwater level of the surrounding ground is prevented from decreasing due to the index of the soil. And the reduction of compressibility in all soils results in anti-sedimentation and co-filling effects. Because of these various effects, they are more frequently used than other auxiliary methods. However, there are many technically unconventional points, and the construction cost is relatively high, and there are restrictions such as that the chemical liquid is currently limited to not containing extreme poisons or fluorine compounds in the water glass system. Therefore, in use, the purpose of use, such as increasing the strength of the ground or reducing the compressibility of the water barrier, should be made clear. For example, prudence is important because the ground may be so hard that it can be difficult to drive later.

Considerations in the selection of chemical injections include ground particle composition, groundwater, composition of injection material and injection pressure. Since material costs are expensive in order of clay, cement, asphalt, and chemicals, it is important to select an appropriate material in consideration of construction and effects. The injection pressure varies with the ground permeability coefficient and the viscosity of the chemical, but in general, the injection pressure in one hole gradually rises at the same time as the initiation of the injection, so if the pressure does not rise, the gel may be considered to be lost. Type adjustment is required. In addition, inadvertently raising the injection pressure affects the structure that pushes or approaches the ground surface, the injection pressure should not exceed 8kgf / cm2, except in special cases.

Groundwater level lowering method (see Figs. 3 and 4) is a groundwater level lowering method for reducing the groundwater level of construction sites in sandy soil. In the case of viscous soils, in general, when the groundwater level is high, part of the load is charged by the gap water, and the effective stress is small. Therefore, the cohesive soil does not sufficiently move the adhesive force or the internal friction angle compared to the case where there is no gap water, so that the shear resistance is low. This causes the collapse of the excavation site. On the other hand, like sandy viscous soils, the shear resistance is lowered or boring due to excavation occurs. These may be the cause of labor accidents. Therefore, this method increases the shear resistance of the ground as the groundwater level is lowered, and also improves the workability by dry work.

Also, soils covered by this process range from 10-1 to 10-4 cm / s in permeability coefficients from silty sand to the sand layer. Generally, the method used is a kiln method, a well point method, a deepwell method, and the like. Among them, in the ground having a relatively high permeability coefficient of 10-1 to 10-2 cm / s, a deep well method or a kiln method which collects groundwater by gravity and pumps it to the pump is suitable. In addition, when the permeability coefficient is 10-3 to 10-4 cm / s, the gravitational action causes a rapid gradient of water, and the catchment range around one well decreases, increasing the number of deep wells or using a powerful vacuum pump. The well point method for forcibly sucking and pumping water in the ground can be used. Since the well point method uses a vacuum, the head of a riser pipe is considered to be 6 m.

It is recommended to use the indentation method in all soils in order to improve the work efficiency due to the independence of the membrane due to the increase of the strength of the ground and the index of the ground.

This method is a method of blocking water by pressurization in order to stabilize excavation site and construction stability. However, careful consideration should be given to explosions caused by pressure or lack of oxygen in the propulsion pipes. In general, the pressure in the propulsion method is calculated as the groundwater pressure at the point (2/3) lowered from the upper edge of the propulsion pipe with the diameter of the propulsion pipe as. However, it is necessary to do so as not to harm the health of people working in the excavation site. In terms of soil conditions, the sand layer is permeable, so if the pressure increases, the leakage of air increases and the pressure decreases. Therefore, if the permeability coefficient is 10-2 cm / s or more except the case where the strata is solid and dense, the indentation method is difficult. If the permeability is good even in the sandy soil layer, the air consumption is large. In addition, even when the uniformity factor is small, dehydration and drying are carried out by an indenter, resulting in loss of adhesiveness and collapse. On the other hand, the silt layer and the clay layer have low water permeability, so that there is little air leakage and sufficient soil reinforcement can prevent water from being exploded and thus increase work efficiency.

In the adoption of the pressurization method, in addition to setting the pressurization pressure, the calculation of the pressurization facility capacity is an important problem. However, since the structure of air permeation when the pressure air acts on the ground is so complicated that many problems have not been solved yet, the estimation of the size of the inpressor capacity is based on empirical conditions.

In addition, in the propulsion work, soil reinforcement is often less than in shield work, so that soil and water conditions are easy to change, the miracle of the work room at the excavation site is small, and the work room is narrow, so that an explosion or air leak occurs. You must cope with the incident sufficiently.

In the freezing method, the freezing method can improve the work efficiency due to the replacement of the soil barrier due to the increase of the strength of the soil in all soils and the index of the ground.

The freezing method (see Fig. 5) is a method of artificially freezing the ground to form walls by frozen soil. In addition, the applicability is wider regardless of the type of soil, the strength of the improved soil is larger than other ground improvement methods, and the index is perfect.However, the construction cost is very high, so it is very difficult to install with other auxiliary methods. Mainly used for This method is largely divided into a brine method using a calcium chloride aqueous solution (Brine) as a cooling liquid and a low temperature liquefied gas method using a low temperature liquefied gas such as liquid nitrogen.

The freezing method cannot be used where the water content of the soil is 10% or less and the ground temperature is 30C or more. Therefore, care must be taken not to lower the water level due to the decrease of the groundwater level due to the excavation of the vertical shaft or leakage from the gap between the soil. . In addition, when there is a flow of groundwater, it is difficult to employ because the freezing progress is inhibited when the flow rate is 1m / day or more.

In addition, when the ground freezes, up to 30kgf / cm2 of expansion force is applied, and the ground freezes and expands, and when thawed, ground subsidence occurs. Therefore, it is necessary to construct in consideration of the influence on the adjacent structure or underground buried material.

However, in Korea, where the introduction of the propulsion method is short, the recognition level of the propulsion method is still very low, and the propulsion method is not recognized as a completed method in the geotechnical field such as the existing tunnel method. At present, however, Japan, the leader of the propulsion method, is setting up the propulsion method as an independent field different from the rock tunnel method, and is making great efforts to develop new propulsion technology. Due to various domestic circumstances different from Japan, it is necessary to develop an independent propulsion method suitable for the Korean situation. For example, in Korea, there are many difficulties in introducing the advanced propulsion technology of Japan. Is very irregular and there are many poorly constructed roads and there is little recognition of the propulsion method, so the construction cost of this field is too low to construct by adopting the Japanese advanced propulsion method, and the rules of the geological foundation of Korea The continuity is less.

In addition, the conduit promotion project is going down to the deeper underground to avoid the existing underground burial, etc. As a result, it is a recent domestic reality that the construction work under the groundwater level is increasing, and the independence of the ground for promotion is not secured. Promotion work on the ground is increasing rapidly. The steel pipe pressurization propulsion method, which is currently widely practiced in Korea, is most important to secure stable ground during excavation work. When the leading ground is unstable, if the construction is carried out with steel pipe press propulsion method, it is buried and promoted. In many cases, it causes the accidents such as sinking pipelines and labor accidents. In this case, Japan, which is an advanced country of the propulsion method, uses a mechanical high-pressure semi-shield method to excavate the end of the propulsion end with the work site, or carry out the project in parallel with a thorough auxiliary method. Many construction people have been rejecting the introduction of advanced technologies.

The conventional freezing method, which is well known as the auxiliary method of the propulsion method, inserts a freezing tube after horizontal boring in a short section in the direction of the pipe propulsion of the forward base and the arrival base, so that the semi-shield can prevent soil and mud when entering and reaching the propulsion ground. It is often used to prevent work delays caused by blowout.In case of soft ground where propulsion direction is easy to meander during pipe propulsion work, after vertical boring work from the ground to the propulsion pipe direction, freeze pipe is injected for long-term freezing. It is widely used to prevent the meandering direction by carrying out work, but the ground subsidence caused by the significant increase of construction cost and facility cost due to freezing work for a long time (week to one month) and thawing of excessively frozen ground There has always been a risk that a massive accident could occur due to the occurrence of ground uplift.

In addition, Patent Application No. 10-2002-0041416, filed by the applicant of the present invention, name of the invention; The freezing steel pipe propulsion method freezes the leading ground to be promoted by using a night time zone without performing the steel pipe propulsion work, Freezing work is carried out only as long as the length of the pipe, so the available distance for one-day propulsion work is very limited.In addition, the strength of the ground rapidly increases due to the freezing of the leading ground to be promoted, which leads to a sharp increase in propulsion force. I was hugging.

In order to solve the above problems, the present invention is a continuous method, the name of the patent application No. 10-2002-0041416, the applicant filed prior application; As an improvement of the simple moving steel pipe propulsion method and the device,

Freeze thaw method used as an auxiliary method of propulsion construction, so that even if the propulsion ground is unstable, the propulsion construction can be carried out safely at low additional cost. It is a technical problem to be achieved by the present invention to provide a (CFT propulsion method) and a device thereof.

In order to achieve the above object, the present invention is a continuous method, by applying the freeze thaw method used as an auxiliary method of the propelling construction, even if the propulsion ground is unstable freezing and to carry out the propulsion construction safely at a low additional cost The present invention relates to a self-supporting unstable ground propulsion method (CFT propulsion method) and a device using a continuous freeze thawing method using a propulsion leading part freeze thawing method using a conventional drilling apparatus having a built-in thawing device.

As shown in Figure 6, the main apparatus of the present method is a multi-stage hydraulic jack used to propel the freeze-thawing oil pipe and the freeze-thawing steel pipe used to freeze or thaw the leading ground of the propulsion (about 1.5m each cylinder head) The multi-stage hydraulic jack is welded to the bottom, and the cylinder contact surface is placed on the reinforcing cap face of the freeze-thawed oil steel pipe so that the other side faces the hydraulic jack support wall on the side of the propulsion steel pipe.) It consists of a propulsion direction control device, a liquid nitrogen supply tank used to freeze or thaw the leading ground to be promoted, a compressed air and liquid nitrogen mixer, and a warm air production supply device and an air compressor installed at the ground base.

For each process, Figure 7 shows that the air discharge hole of the freeze-thaw steel pipe during the freeze-thaw steel pipe on the leading ground to be promoted when the pipe propulsion work is stopped due to the steel pipe welding work or earth excavation work The air compressor installed at the ground base is operated to prevent the blockage and to send compressed air to the freeze-thaw steel pipes. The freeze-thaw steel pipes are about 3m using a multi-level hydraulic jack with a pair of 1.5m cylinder heads interviewed with each other. Promote to the leading ground to be promoted.

After this work process is completed, the air compressor is stopped as shown in FIG. 8, and then the valve of the liquid nitrogen supply tank is opened to open the lead ground to be pushed through the freeze-thaw oil pipe according to the softness of the ground. Quick freeze for 30 minutes to 1 hour.

When the quick freezing operation process is completed, as shown in Fig. 9, the valve of the liquid nitrogen supply tank is closed, and then the air compressor and the hot air production equipment are simultaneously operated to freeze the warm air and gradually send it through the steel pipe. Partial defrosting work is carried out so that the pipe can be propagated gently to the projected soil without rapid increase in propulsion force, while carrying out steel pipe propulsion work using the original hydraulic jack installed at the forward base, and at the same time, excavating and discharging the soil. To complete the propulsion of about 3m.

As shown in FIGS. 10 to 15, the freeze-thaw steel pipe is joined to a freeze-thaw steel pipe made of steel pipe material having a tip of 150 mm conical high carbon steel round bar having a length of 3450 mm and a diameter of 5-6 mm with a diameter of 5-6 mm. The part in contact with the cylinder surface of the multi-stage hydraulic jack uses a reinforcing cap and is not damaged by the propulsion pressure of the multistage hydraulic jack.

In addition, an injection hole was installed at the rear portion of the freeze-thawed oil-filled steel pipe so that compressed air and liquid nitrogen were injected. To prevent damage while the freeze-thawed steel pipes are being propelled, a guide rail was installed on the inner surface of the propulsion lead pipe to ensure safe and precise propulsion, and a freeze-thaw steel pipe protection steel plate was installed to protect the freeze-thaw steel pipes.

In addition, to protect the freeze-thaw steel pipe during the excavation work, a protective iron plate was installed on the inner bottom of the propulsion lead pipe and removed after the excavation work.

Hereinafter, the present invention will be described in detail through examples.

Example

First Process (Promotion Process)

As shown in FIG. 6, a freeze-thaw oil pipe (1) and a propulsion lead pipe (C) having a multi-stage hydraulic jack (7) built in the rear of the freeze-thaw oil pipe (1) at the foremost inside of the soil (B),

Match the propulsion pipe (D) with the hydraulic jack for directional correction inside the rear of the propulsion pipe (C), and then the rail (26) of the rear of the propulsion pipe (D) to advance the propulsion pipe (D) Reaction wall 22, the hydraulic jack 23, the cylinder 24 and the propulsion auxiliary pipe 25 formed in the upper portion of the close contact,

As mentioned above, the air compressor is installed in the ground base so that the freeze-thaw oil-holes through-holes (2) of the freeze-thaw-oiled steel pipes (1) are not blocked due to soil filling while the freeze-thaw oil-steel pipes are being pushed on the leading ground to be promoted. (41) is operated to send compressed air to freeze-thaw oil pipe (1),

2nd process (direction correction process)

Installed in the upper, lower, left and right installed between the rear side of the hydraulic jack support wall 11 formed on one side of the rear inner edge of the propulsion lead pipe C and the direction correction reaction wall 19 installed on the front of the propulsion pipe D. When using the four direction correction hydraulic jacks and the cylinder 20 to correct the direction to the right, the propulsion diagram is made by operating the left direction correction jack to move forward only to the left, so that the overall direction is corrected to the right. After correcting the direction of the pipe (C),

3rd process (freezing process)

As shown in FIG. 7, a plurality of freeze-thaw oil steel tubes 1 inside the propulsion lead pipe C are securely advanced and excavated along the rails 60 using a plurality of multi-stage hydraulic jacks 7. After positioning at the point as shown in Figure 8,

By regulating the valve 31 connected to the liquid nitrogen storage tank 30 installed in the propulsion pipe D, nitrogen is supplied to the mixer 35, and the air compressor 41 is operated to carry the compressed air together with the compressed air. Supplying high-pressure nitrogen gas to the freeze-thaw oil pipe (1) through the freeze and thaw pipes (33) to rapidly drive the lead ground to be promoted for 30 minutes to 1 hour (at this time the cooling temperature is -70 ℃) depending on the softness of the ground. After freezing,

4th process (thawing process)

As shown in FIG. 9, when the freezing ground B-1 formed around the propulsion target ground ground F to be formed is constantly formed, the valve 31 of the liquefied nitrogen storage tank 30 is locked, and then warm air The manufacturing supply device 40 is operated to gradually send the warm air through the compressed air pipe 34 through the freeze-thaw oil pipe (1) to the periphery of the propulsion leading ground (F), so that the propulsion leading pipe (C) Partial defrosting work is carried out so that it can be propelled gently without rapid rise of thrust force, while steel pipe propulsion work is carried out using the hydraulic jack 25 installed at the forward base (E). Complete about 3m of propulsion work.

After the freezing operation, the freeze-thaw oil pipe (1) is allowed to gradually rise in temperature from 10 ° C. to 50 ° C. to 60 ° C. so as not to rupture due to the rapid rise in temperature of the hot air production supply device 40, and then the warm air installed at the ground part. After stopping the operation of the manufacturing supply device 40,

5th process (excavation process)

Using a conventional apparatus, the propulsion lead pipe (C) discharges the introduced earth and sand to the outside by using a conventional mechanical excavation, and then returns to the first process to repeatedly excavate the self-reliable ground for a desired distance.

Hereinafter, the apparatus of the present invention will be described with reference to the drawings.

Figures 1 to 5 of the conventional propulsion method photographs, Figure 6 Independent unstable ground propulsion device (CFT propulsion) using the freezing, thawing of the present invention, Figure 7 Independent unstable ground propulsion device using the freezing, thawing of the present invention (CFT (Promotion) Detailed drawing of the first step (freezing pipe propulsion), Figure 8 Detailed description of the self-reliant ground propulsion device (CFT propulsion) using the freezing and thawing of the present invention (CFT) Detailed drawing of the second step (leading ground freezing step), Figure 9 Freezing of the present invention , Independence unstable ground propulsion device using thawing (CFT propulsion) 3rd process (leading ground thawing and steel pipe propulsion process) detail, Figure 10 freezing, thawing front detail of the present invention, Figure 11 propulsion lead pipe front of the present invention Fig. 12 is a detailed view of the back of the propulsion lead pipe of the present invention, Fig. 13 is a detailed view of the freeze-thaw oil pipe of the present invention, Fig. 14 is a detailed view of the freeze-thaw oil pipe of the present invention bound to the propulsion lead pipe, Fig. 16 of the present invention. The multi-level hydraulic jack supporting wall is shown in detail. Steel pipe (1), freezing and thawing oil hole (2), multi-stage hydraulic jack (7), front cylinder (8), rear cylinder (9), hydraulic jack support wall (11), freeze thawing oil pipe support (12), freeze thawing Perforated steel pipe head (14), freeze thawing oil steel pipe body (15), freeze thawing oil steel pipe stopper (16), hydraulic jack reaction wall for direction correction (19), hydraulic jack for direction modification and its cylinder (20), hydraulic hose (21), reaction wall (22), hydraulic jack (23), cylinder (24), propulsion auxiliary pipe (25), rail (26), hydraulic unit (27), liquid nitrogen storage tank (30), valve (31, 36,37, freezing and thawing pipe 33, compressed air pipe 34, mixer 35, hot air supply and supply device 40, air compressor 41, triangular support wall 45, rivet joint (46) ), Freeze protection steel plate (50), rail (60), rubber packing (70), A: road, B: soil, B-1: frozen soil, B-2: thawed soil, C: propulsion lead, D : Propulsion pipe, E; forward device, F: propulsion target ground.

Looking at the structure, as shown in Figure 6 as a device for pressing the steel pipe in the soil (B) layer of the lower road (A),

A freeze-thawing oil-tight tube 1 is installed at the front, and a multi-stage hydraulic jack 7 for advancing the freeze-thaw oil-tight tube 1, a direction modifying hydraulic jack for correcting the direction, and a propulsion diagram having the cylinder 20 embedded therein. A pipe (C), a propulsion pipe (D) connected to the rear of the propulsion lead pipe (C) and having a built-in freezing device therein, and between the rear of the propulsion lead pipe (C) and the front of the propulsion pipe (D). Rubber packing (70) inserted into the pipe circumference of the, and the rear direction of the hydraulic jack support wall (11) formed on one side of the rear inner edge of the propulsion lead pipe (C) and the hydraulic jack reaction force for the direction correction installed on the front of the propulsion pipe (D) Independent unstable ground propulsion using continuous freezing and thawing comprising a direction correction device installed between the walls 19 and a forward device E formed on the rear surface of the propulsion pipe D to advance the pipes by forward pressure. More detailed description of the device as follows.

As shown in Figures 6 to 8, the propulsion line conduit (C) is a large pipe shape, the end portion is formed slightly wider than the entire structure to interpolate a part of the front surface of the propulsion pipe (D) located in the rear It is installed at the forefront, and embedded in the front of the propulsion lead pipe (C), a plurality of freeze-thaw oil pipes (2) formed with a plurality of freeze-thaw oil-holes through-holes (2) of the tip is provided in a high carbon steel round bar of about 150mm (1) and the freeze-thaw oil-filled steel pipe which is formed on the inner edge of the propellant lead pipe (C) in a wave shape at the bottom of the plurality of freeze-thaw oil-filled steel pipes (1) and protects the freeze-thaw oil-filled steel pipe (1) and the propulsion pipe The support 12 is connected to the rear surface of the freeze thawing oil steel tube 1 by a front cylinder 8 to advance the freeze thawing oil steel tube 1 and a plurality of hydraulic hoses connected to the hydraulic unit 27. Multistage hydraulic jack (7), and the freeze thaw oil The freezing and thawing pipe 33 is installed on one side of the rear side of the steel pipe (1) and the freezing and thawing gas flows in and out, and the propelling lead pipe (C) is formed by protruding toward the center of one side of the inner edge of the rear end of the multistage hydraulic jack ( 7) the hydraulic jack support wall 11 provided in close contact with the rear cylinder 9 installed at the rear side of the cylinder, the direction correcting hydraulic jack formed in close contact with the rear surface of the hydraulic jack support wall 11, and the cylinder 20 thereof; The rear surface of the direction correction hydraulic jack and the cylinder 20 is configured to be in close contact with the direction modification hydraulic jack reaction wall 19 provided on the front surface of the propulsion pipe (C).

6 to 9, the multi-stage hydraulic jack (7) is located behind the freeze-thaw oil steel tube (1) installed in the forefront of the propulsion lead pipe (C), the freeze-thaw oil steel tube (1) Is formed between the multi-stage hydraulic jack support wall 11 and welded with two hydraulic jacks in opposite directions.

The cylinder formed in the front hydraulic jack, that is, the front cylinder (8) is in close contact with the rear of the freeze-thaw oil pipe (1), the cylinder formed in the rear hydraulic jack, that is, the rear cylinder (9) is a multi-stage hydraulic jack support wall (11) It can be seen that the structure is in close contact with.

6 to 9, the direction correcting device installed on the rear of the propulsion lead pipe (C) and the rear of the leading heavy jack jack (11) formed on one side of the rear inner edge of the propulsion lead pipe (C); And four directional correction jacks and their cylinders 20 installed on the top, bottom, left and right sides of the direction correction hydraulic jack reaction wall 19 provided on the front surface of the propulsion pipe D, and the direction correction jacks and the same. It is installed on the rear of the cylinder 20 to support the cylinder 20 of the leading heavy-duty jack and the direction correction jack to advance the propulsion lead pipe (C) and the direction correction repelling wall (19) installed on the foremost surface of the propulsion pipe (D). ), The rubber packing 70 inserted between the rear end of the propulsion lead pipe (C) and the front surface of the propulsion pipe (D), and the rear end of the direction correction reaction force wall (19), and are connected by rivets (46). It can be seen that the triangular support wall 45 is configured.

As shown in Figure 6 to Figure 7, the propulsion pipe (D), one side of the front portion is inserted into the rear of the propulsion wire conduit (C), the forward device (E) is located,

The direction correction reaction wall 19 installed in the front of the propulsion pipe (D), the liquid nitrogen storage tank 30 for freezing the ground therein, and formed in the pipe extending from the liquid nitrogen storage tank 30 to supply A valve (31) for adjusting the nitrogen to be mixed, and the mixer 35 is installed in the middle of the tube to mix the high pressure air supplied from the air compressor 41 and the nitrogen supplied from the liquefied nitrogen storage tank (30) And valves 36 and 37 for controlling various gases provided and supplied in the mixer 35, compressed air engines 34 installed on one side of the mixer 35 to introduce high-pressure air or hot air air, The freeze and thaw pipes 33 are installed on the other side of the mixer 35 and connected to the freeze and thaw gas pipes 1 to be supplied to the freeze-thaw oil pipes 1.

The forwarding device (E) is installed on the rear of the propulsion pipe (D) and the upper portion of the rail 26 to advance the steel pipes by force,

Reaction wall 22 is installed on the rear, and the front of the reaction wall 22, the hydraulic jack 23 is connected to the hydraulic unit 27 by the hydraulic hose 21 and connected to the hydraulic jack 23 Propulsion auxiliary pipe 25 is in close contact with the cylinder 24 and the front of the cylinder 24 to protect the propulsion pipe (D), and in close contact with the rear end of the propulsion pipe (D) in front of the propulsion auxiliary pipe (25). The air compressor 31 and the warm air production supply device 40 are connected to the mixer 35 by a compressed air pipe 34 connected to the ground.

10 and 11 are formed on the inner edge of the propellant lead pipe (C) in a wave shape in the lower portion of the plurality of freeze-thaw oil pipes (1) to protect the freeze-thaw oil pipes (1) and propulsion lead pipes It consists of a steel pipe support (12),

FIG. 11 is provided with a freeze thaw tube protecting iron plate 50 which protects the freeze thaw tube at the lower portion of the propulsion lead pipe C during the excavation work.

The freeze-thaw steel pipe (1) formed of a high-strength carbon steel round bar of the head portion is provided with a conical shape in which the front portion is inclined inclined sharply, as shown in FIGS. The freezing and thawing oil and steel tube body portion 15, which is welded to the head 14 and the rear surface of the freeze-thawing oil-hole steel tube head 14, the space is formed to store freezing and thawing gas therein, and the freeze-thawing A plurality of freeze-thaw oil-holes through-holes (2) formed on the surface of the hole steel tube body portion 15, the freeze-thaw oiled steel tube stopper (16) formed on the rear surface of the freeze-thaw oil-holes steel tube body (15), and the freeze thaw It is formed on one side of the perforated steel pipe (1) to fix the freeze and thaw pipes (33) and the freeze and thaw pipes (1) to freeze and thaw gas flows in and out, and guides forward and backward from the propulsion lead pipe (C) Les It can be seen that the work 60 is provided.

As shown in Fig. 15, the hydraulic jack support wall 11 has a rear cylinder 9 of the multi-stage hydraulic jack 7 in close contact with the front surface, and a direction correction jack in close contact with the rear surface, and is inclined toward the rear of the lower portion. It can be seen that the triangular support wall 45 of the right triangle and the rivet joint 46 for fixing the triangular support wall 45 to the propulsion lead pipe (C).

According to the present invention as described above, by using the time when the earth and sand excavation work and the propulsion steel pipe connection welding operation is performed, the freezing pipe can be pushed to the leading ground to be promoted, and the target ground to be rapidly frozen using liquid nitrogen, which is a refrigerant for quick freezing, can be frozen. As a result, the limit of the distance for propelling work per day is reduced, and when the steel pipe propulsion work is performed after the rapid freezing work is completed, the warm air is supplied to the leading ground to be promoted from the warm air manufacturing equipment installed at the ground base through the freezing pipe. By reducing the ground strength rapidly increased due to rapid freezing so that the driving force does not rise sharply,

In addition, the liquid nitrogen, which is a fast freezing refrigerant, is directly absorbed through the freezing oil pipe to the propulsion ground, and the oxygen deficiency phenomenon of the propulsion steel pipe due to the use of liquid nitrogen is minimized by preventing leakage of thermal efficiency and refrigerant. And it is effective in suppressing the temperature drop of the workplace to the maximum.

Claims (9)

Freezing carried out continuously. In the self-reliant ground propulsion method (CFT propulsion method) using the thawing method, First Process (Promotion Process) A freeze-thaw oil pipe (1) and a propulsion lead pipe (C) having a multi-stage hydraulic jack (7) built in the rear of the freeze-thaw oil pipe (1) at the forefront of the soil (B), The rear of the propulsion pipe (C) to match the propulsion pipe (D) with a built-in direction modification hydraulic jack therein, and then the rail (26) of the rear of the propulsion pipe (D) to advance the propulsion pipe (D) Reaction wall 22, the hydraulic jack 23, the cylinder 24 and the propulsion auxiliary pipe 25 formed in the upper portion of the close contact, As mentioned above, the air compressor is installed in the ground base so that the freeze-thaw oil-holes through-holes (2) of the freeze-thaw-oiled steel pipes (1) are not blocked due to soil filling while the freeze-thaw oil-steel pipes are being pushed on the leading ground to be promoted. (41) is operated to send compressed air to freeze-thaw oil pipe (1), 2nd process (direction correction process) Installed in the upper, lower, left and right installed between the rear surface of the hydraulic jack support wall 11 formed on one side of the rear inner edge of the propulsion lead pipe C and the direction correction reaction wall 19 installed on the front surface of the propulsion pipe D. When using the four direction correction hydraulic jacks and the cylinder 20 to correct the direction to the right, the propulsion diagram is made by operating the left direction correction jack to move forward only to the left, so that the overall direction is corrected to the right. After correcting the direction of the pipe (C), 3rd process (freezing process) A plurality of freeze-thaw oil pipes (1) in the interior of the propulsion lead pipe (C) by using a plurality of multi-stage hydraulic jack (7) to advance safely along the rail (60) and positioned as shown in Figure 8 to the excavation point after, The valve 31 connected to the liquefied nitrogen storage tank 30 installed in the propulsion pipe D is adjusted to supply nitrogen to the mixer 35, and the air compressor 41 is operated to carry the compressed air together with the compressed air. Supplying high pressure nitrogen gas to the freeze thawing oil pipe (1) through the freeze and thaw pipes (33), and the leading ground to be promoted for 30 minutes to 1 hour depending on the softness of the ground (at this time the cooling temperature is below -70 ℃) After freezing, 4th process (thawing process) When the freezing ground (B-1) formed around the leading ground (F) to be promoted is formed constantly, the valve 31 of the liquefied nitrogen storage tank 30 is closed, and then the hot air production supply device 40 is operated. By gradually sending the warm air through the compressed air pipe (34) through the freeze-thaw oil pipe (1) to the periphery of the target ground (F), so that the propulsion leading pipe (C) smoothly propagates to the projected soil. While carrying out partial thawing work, the steel pipe propulsion work was carried out using the hydraulic jack 23 installed at the forward base E, and the earth and sand excavation and discharge work were completed in parallel. after, The freeze-thaw oil pipe (1) is a temperature rise from 10 ° C to 50 ° C to 60 ° C so as not to rupture due to a sudden rise in temperature of the hot air production supply device 40, and then the hot air production supply device installed on the ground After stopping the operation of 40, 5th process (excavation process) Continuous freezing of the earth and sand introduced into the propellant lead pipe (C) by using a conventional apparatus to discharge the earth and sand to the outside using a conventional excavator, and then return to the first process to repeatedly excavate the desired distance. . Self-reliable ground propulsion method using thawing method (CFT propulsion method) delete delete delete delete Continuous freezing. In the self-reliant ground propulsion system (CFT propulsion unit) using the thawing method, A freeze-thawing oil-tight tube 1 is installed at the front, and a multi-stage hydraulic jack 7 for advancing the freeze-thaw oil-tight tube 1, a direction modifying hydraulic jack for correcting the direction, and a propulsion diagram having the cylinder 20 embedded therein. A pipe (C), a propulsion pipe (D) connected to the rear of the propulsion lead pipe (C) and having a built-in freezing device therein, and between the rear of the propulsion lead pipe (C) and the front of the propulsion pipe (D). Rubber packing 70 is inserted into the direction and the rear side of the hydraulic jack support wall 11 formed on one side of the rear inner edge of the propulsion lead pipe (C) and the hydraulic jack reaction wall for directional correction installed on the front of the propulsion pipe (D) (19) A direction correction device installed between the) and formed on the back of the propulsion pipe (D) is composed of a forward device (E) for advancing the pipes by forward pressure, The multi-stage hydraulic jack (7) is located behind the freeze-thaw oil steel tube (1) installed in the forefront of the propulsion lead pipe (C), the freeze-thaw oil steel tube (1) and the multi-stage hydraulic jack support wall (11) It is formed between the two hydraulic jacks in the opposite direction and welded, the cylinder formed in the front hydraulic jack, that is, the front cylinder (8) is in close contact with the rear of the freeze-thawing oil steel tube (1), the rear hydraulic jack The cylinder formed in the rear cylinder 9, the structure is in close contact with the multi-stage hydraulic jack support wall (11), The direction correcting device installed on the rear of the propulsion lead pipe (C) is the rear of the multi-stage hydraulic jack support wall (11) formed on one side of the rear inner rim, and the direction correction reaction wall (19) installed on the front of the propulsion pipe (D) Four direction correction jacks and their cylinders 20 installed on the front, bottom, left, and right sides between the front and the rear side of the direction correction jacks and the cylinder 20, and support the cylinders 20 of the direction correction jacks. To advance the propulsion lead pipe (C) and between the direction correction hydraulic jack reaction wall (19) installed at the forefront of the propulsion pipe (D), between the rear of the propulsion lead pipe (C) and the front of the propulsion pipe (D). It is composed of a rubber packing 70 to be inserted, and a triangular support wall 45 which is installed at the rear of the direction correction reaction wall 19 and joined by rivets 46, The forward device (E) is a device installed on the rear of the propulsion pipe (D) and the upper portion of the rail (26) to advance the steel pipes by force, the reaction force wall 22 is installed on the rear and the reaction wall ( 22 is installed on the front surface, and is in close contact with the hydraulic jack 23 connected to the hydraulic unit 27 by the hydraulic hose 21, the cylinder 24 connected to the hydraulic jack 23, and the front of the cylinder 24. And the propulsion auxiliary pipe 25 to protect the propulsion pipe D, and the front of the propulsion auxiliary pipe 25 to be in close contact with the aft of the propulsion pipe D, and the air compressor 41 on the ground. Independent unstable ground propulsion unit (CFT propulsion unit) using a continuous freezing, thawing characterized in that the structure is connected to the mixer 35 by the compressed air engine 34 is connected to one and the hot air production supply device (40). The method according to claim 6, wherein the propulsion lead pipe (C) is a large pipe shape, a portion of the end portion is formed slightly wider than the whole is a structure for interpolating a part of the front surface of the propulsion pipe (D) located in the rear, is installed at the foremost The freeze-thaw oil-hole steel tube (1) and a plurality of freeze-thaw oil-hole steel through-holes (2) are formed in the front of the propulsion lead pipe (C), the tip portion is provided in a high carbon steel round bar of about 150mm conical A freeze-thaw oil perforated steel pipe support (12) formed on the inner edge of the propellant lead pipe (C) in a wave shape at the lower part of the plurality of freeze-thaw oil steel pipes (1) and protecting the freeze-thaw oil steel pipe (1) and the propulsion pipe; During earth and sand excavation work, the freeze-thaw oil steel tube protective steel plate (50) temporarily installed to protect the freeze-thaw tube at the lower portion of the propulsion lead pipe (C), and the front cylinder (8) at the rear of the freeze-thaw oil steel tube (1) Freeze thaw which is connected by Advancing the steel pipe (1) and a plurality of multi-stage hydraulic jack (7) connected to the hydraulic unit (27) by a hydraulic hose, and the freezing and thawing gas flows into the freezing and thawing gas is installed on one side of the rear side of the freeze-thawing oil steel pipe (1) The thawing pipe 33 and the propulsion line conduit C are formed by protruding to a central portion at one side of the inner edge of the rear end, and are provided in close contact with the rear cylinder 9 installed at the rear of the leading medium pressure jack 7. The direction correction hydraulic jack and its cylinder 20 formed in close contact with the wall 11, the rear surface of the hydraulic jack support wall 11, and the rear surface of the direction modification hydraulic jack and the cylinder 20 are propulsion pipes (C). Independent unstable ground propulsion device (CFT propulsion device) using a continuous freezing, thawing, characterized in that the structure is in close contact with the direction correction hydraulic jack reaction wall (19) installed in the front of the. The method according to claim 6, wherein the propulsion pipe (D) is one side of the front portion is interpolated in the rear of the propulsion lead pipe (C), the rear of the forward device (E) is located, the direction modification installed on the front of the propulsion pipe (D) A hydraulic pressure jack reaction wall 19, a liquid nitrogen storage tank 30 for freezing the ground therein, a valve 31 for regulating nitrogen supplied to the pipe extending from the liquid nitrogen storage tank 30, and Is installed in the middle of the tube and the mixer 35 to mix the high pressure air supplied from the air compressor 41 and the nitrogen supplied from the liquid nitrogen storage tank 30, and is installed in the mixer 35 Valves 36 and 37 for regulating various gases supplied; The mixer 35 is installed on one side of the compressed air pipe (34) for introducing high-pressure air or hot air air, and the freeze and thaw gas pipe (1) installed on the other side of the mixer (35) and mixed Self-reliable ground propulsion unit (CFT propulsion unit) using a continuous freezing, thawing, characterized in that consisting of a freeze and thaw pipe 33 is connected to be supplied to. According to claim 6, The freeze-thaw oil steel tube (1) is provided with a conical shape inclined to the front portion sharply, the freeze-thaw oil steel tube head 14 to form a sloped portion at the foremost, and the freeze-thaw oil hole It is welded to the rear of the steel pipe head 14, and formed on the surface of the freeze-thaw oil hole steel tube body portion 15 and the freeze-thaw oil hole steel tube body portion 15, the space formed to store freezing and thawing gas therein A plurality of freeze-thaw oil-holes through-holes (2), the freeze-thaw oil-holes steel tube stopper (16) formed on the rear of the freeze-thaw oil-holes steel tube body portion 15, and is formed on the rear side of the freeze-thaw oil-holes steel pipe (1) It is provided with a freezing and thawing pipe 33 into which the freezing and thawing gas is introduced and discharged, and a rail 60 which fixes the freeze-thawing oil pipe 1 and guides forward and backward from the propulsion lead pipe C. In the lower part of the perforated steel pipe (1) Self-reliable independence using continuous freezing and thawing, characterized by consisting of a freeze-thaw oil-tight steel pipe (1) and a freeze-thaw oil-tight steel pipe support (12) formed on the inner edge of the propulsion lead pipe (C) to protect the propulsion pipe. Ground Propulsion System (CFT Propulsion System).

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