KR100963880B1 - Excavating method for underground plaza using steel casing retaining wall - Google Patents

Abstract

The present invention relates to an underground underground excavation method using a steel casing earth wall, (a) to excavate the construction work tunnel 71 horizontally or vertically for excavation of the underground plaza 70, the end of the construction work tunnel 71 Excavating horizontally the upper space 72 of the underground plaza planned position to be connected with the horizontal; (b) mounting the inner and outer wall casings (20, 21) at the predetermined length and height to the earth wall installation position for excavating the underground plaza (70) in the upper space (72) of the underground plaza planned location; (c) sinking and grounding the tip inner and outer wall casings (20, 21) to their excavated bottom surface (50) at the same time as the ground excavation between the tip inner and outer wall casings (20, 21); (d) When excavation of the tip inner and outer wall casings 20 and 21 is completed, the intermediate connection inner and outer wall casings 30 and 31 of the same length and shape are formed on the top of the tip inner and outer wall casings 20 and 21. After the step of installing the joint portion and the joint process, and (e) when the joint between the end portion and the inner and outer wall casings (20, 21, 30, 31) of the intermediate portion is completed, the inner and outer wall casing (20) 21) excavation of the ground between the excavation and at the same time the inner and outer wall casing sphere 10 consists of the step of sinking down to the excavation bottom surface 50, even if there is a rock layer during excavation for excavation of the casing to rock fracture Not only can it withstand the shock and vibrations involved, it is also effective in blocking groundwater inflow as it is a rigid structure that is resistant to cracks and breakage.

Description

Excavating method for underground plaza using steel casing retaining wall}

The present invention relates to an underground square excavation method using a steel casing earth wall, and more particularly, economic and safety by using only a top-down excavation method and a work tunnel for construction in parallel with manpower and machines when constructing an earth wall used for excavation of an underground square. This excellent, high-strength, high-strength steel casing is used as the earth wall used for excavation of underground plazas, so that even if a rock layer exists during the excavation of the casing, it can not only withstand the shock and vibration associated with rock fracture, but also crack The present invention relates to an underground pit excavation method using a steel casing earth wall that is effective for preventing groundwater inflow as a rigid structure that is resistant to damage or damage.

In recent years, when it is necessary to secure a certain space inside underground tunnels such as stockpiling bases such as oil and gas, pumping power plant or waste storage, underground rock foundations and soils should be excavated to form underground plazas of large sections. .

In general, as the underground underground excavation method, conventional upward blasting method using manpower and hydraulic rotary mechanical downward excavation method using a plurality of tunnels are used.

However, conventional upward blasting methods using manpower have a slow working speed, a high risk of falling rocks and falling rocks, and it is difficult to cope with changes in the rock. In addition, the hydraulic rotary mechanical down-drilling method using a plurality of tunnels requires digging a plurality of construction work tunnels for each section in advance on the side of the square before excavating the underground plaza. In addition, there is a delay in the construction period associated with excavating a number of such tunnels.

Therefore, in the present invention, the steel casing earth wall is used for the excavation of the underground plaza. The earth wall is a temporary structure installed to stabilize the excavation slope and block the inflow of groundwater during the underground construction. There are construction method, sheet pile method, CIP method, SCW method and underground continuous wall method.

The earth plate method is a method using a plurality of earth plate and H-PILE drive H-PILE at regular intervals to be excavated in the basement, and sandwich the earth plate of the wood plate between the H-PILE to support the earth and sand on the back, It is a method to install jibo ball for supporting H-PILE.

In addition, the SHEET PILE method is a method of constructing the earth wall by repeatedly inserting the SHEET PILE into the ground vertically and then fitting the end of the other SHEET PILE to the connecting portion of the end and inserting the end into the ground.

The CIP method is a method in which a hole is drilled in the ground with an AUGER, and a reinforcing bar or H-PILE is placed in the hole, and concrete or cement paste is poured to form a continuous concrete column. After the construction, they are excavated with a brace to support the concrete wall to prevent collapse.

In addition, the SCW method is a method of making an underground continuous wall with an AUGER having three axes, and the construction method is almost the same as the CIP.

However, the conventional earth wall construction method is mainly applicable to the soil ground or earth and sand soil layer, and when the construction on the sandstone or all-earth soil layer, the pre-boring method should be performed, and the rock layer has a difficult construction.

In particular, the earth plate method has a weak groundwater blocking effect, so it cannot be used at all when the ground water level on the back of the earth wall is high, and the earth plate is made of wood, which is weak in strength, so that the earth plate is frequently damaged by water pressure and earth pressure. In addition, it is not suitable for being used as a part of a later construction, and it is necessarily accompanied by demolition work.

In addition, in the case of soil wall in the way of placing concrete in the ground, it is difficult to control the quality of concrete in the ground, and it is difficult to repair and reinforce the groundwater leakage after the construction of the ground wall.

The present invention has been made to solve the above problems, an object of the present invention by using a high tension, high-strength steel casing as the earth wall used in the excavation of underground squares, even if there is a rock layer during excavation for excavation of the casing Not only can it withstand the shock and vibration associated with the crushing, but also provides an underground underground excavation method using a steel casing earth wall that is effective in preventing groundwater inflow as a rigid structure that is resistant to cracking and damage.

Another object of the present invention is that the earth wall is made of a high strength steel sheet effective to support the external underground stress, excellent construction and safety, easy quality control, underground underground using a steel casing earth wall that can be used as part of the building to be constructed later To provide an excavation method.

It is still another object of the present invention to use an underground pit excavation method using a steel casing earth wall with excellent economic efficiency and safety by using only one construction work tunnel and a top-down excavation method that parallels manpower and machines when constructing an earth wall used for excavation of underground yards. To provide.

In order to achieve the above object, the present invention (a) to excavate the construction work tunnel horizontally or vertically to excavate the underground plaza, and horizontally the upper space of the underground plaza planned position to be connected to the end of the construction work tunnel Excavating; (b) mounting the inner and outer wall casings having a predetermined length and height to the earth wall installation position for excavation of the underground plaza in the upper space of the planned underground plaza; (c) excavating the excavation soil to the outside while excavating the ground between the tip inner and outer wall casings, and simultaneously excavating and excavating the tip inner and outer wall casings to the excavation bottom surface at its own weight; (d) When the excavation of the depth of a certain degree less than the height of the inner and outer wall casings and the excavation of the inner and outer wall casings of the distal end are completed, the inner and outer wall casings having the same length and shape as the upper part of the inner and outer wall casings of the distal end After the step of connecting the joints and the joint process, and (e) when the joint between the inner and outer wall casing of the front end portion and the inner and outer casing of the intermediate portion is completed, again excavating the ground between the inner and outer wall casing of the front end and excavation and At the same time, the inner and outer wall casing sphere is characterized in that consisting of the step of digging down to the excavation bottom surface.

As described above, the underground square excavation method using the steel casing earth wall of the present invention is excellent in economics and safety by using only a top-down excavation method and a single work tunnel for the construction of the earth wall used for excavation underground underground and a single construction work tunnel, By using a high tensile and high strength steel casing as the earth wall used to excavate underground plazas, it is able to withstand the shock and vibrations associated with rock crushing even when a rock layer exists during the excavation of the casing. Its strong stiffness structure is effective in blocking groundwater inflow, and the earth wall is made of high strength steel sheet which is effective for supporting external underground stresses. It is excellent in construction and safety, easy to quality control, and can be used as a part of the building afterwards. There is.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention configured as described above are as follows.

1 is a cross-sectional view of the construction completed by the underground square excavation method according to the invention, Figure 2 is a perspective view showing a part of an embodiment of the earth wall structure used in the underground square excavation method according to the present invention, Figures 3 to 5 6 is a cross-sectional view showing the sequence of the underground plaque excavation method according to the present invention, Figure 6 is a construction flow diagram of the underground plaque excavation method according to the present invention.

The basic structure of the earth wall used in the underground square excavation method using the steel casing earth wall of the present invention is the front end casing (20, 21) and the front end casing (20, 21) made of a predetermined length and height as shown in Figs. Intermediate connecting casing (30, 31) of the same length and shape as the 21, 21 is mutually coupled in the vertical direction, the joint between the front end casing (20, 21) and the intermediate connecting casing (30, 31) is a weld joint (41) In this case, the welding groove 40 is preferably formed at the upper and lower ends of each of the casings in the case of the welding joint 41 so as to correspond to the adjacent casings.

Casing sphere 10 consisting of the tip casing (20, 21) and the intermediate connecting casing (30, 31) is installed in a double while maintaining a constant interval to form a earth wall, if necessary, the horizontal support beam (23) at regular intervals Therefore, the front end portion and the intermediate connection portion is fixedly installed between the inner and outer wall casings (20, 21, 30, 31), it is preferable that the lower end 22 of the front end casing is processed into a V-shaped or inverted trapezoidal shape.

On the other hand, as shown in Figure 3 to 6, when explaining the underground square excavation method using the steel casing earth wall as follows.

First, the construction work tunnel 71 is excavated horizontally or vertically to excavate the underground plaza 70, and the upper space 72 of the underground plaza plan position is horizontally connected to be connected to the end of the construction work tunnel 71. However, the upper space 72 of the underground plaza planned position should be excavated to a certain extent wider than the cross section of the underground plaza 70 to enable the equipment work for casing installation and excavation (Fig. 3a).

Of course, the equipment and materials required for the casing and excavation through the work tunnel 71 for construction is carried in or the excavated soil is carried out.

Next, the upper spaces of the underground plaza plan position are doubled to form the inner and outer walls of the earth walls for excavating the underground plaza 70 with the tip casings 20 and 21 made to have a predetermined length and height suitable for the site conditions. At 72, it is mounted to the earth wall installation position (Fig. 3b). Here, the double tip inner and outer wall casings 20 and 21 are sufficiently resistant to underground stresses such as external earth pressure or water pressure when excavating into the ground of the casing, and are effective in blocking groundwater inflow, and fracture the rock between the inner and outer wall casings. In order to prevent cracking and damage of casing wall from impact and vibration, high tensile and high strength steel plates of constant thickness should be used in consideration of site conditions.

In addition, the casing, as shown in the embodiment of Figure 1, the steel casing for excavation of the underground plaza 70 of the present invention is integrally formed in the cross-sectional shape of the earth wall construction is the front end inner and outer wall casing (20, 21) This may be mounted, in the case of mounting integrally, if the problem occurs in the transport or mounting of the casing, it is necessary to produce the front end casing (20, 21) for each section by dividing the section and double mounting.

Further, the lower end toe 22 of the tip casing is preferably fabricated into a V-shape or an inverted trapezoidal shape so that the casing can be easily excavated to the ground.

Then, when excavating the excavation soil to the outside while excavating the ground between the tip inner and outer wall casings (20, 21), at the same time the tip end casing (20, 21) to its excavation bottom surface 50 at its own weight It is settled and excavated, and the vertical excavation surface 51 of the ground by excavation is supported by the inner and outer wall casings 20 and 21 at the same time as excavation and is not exposed to the outside, thereby preventing the collapse of the excavation surface (Fig. 4c), if necessary, it is possible to prevent the collapse of the excavation surface and the conduction of the earth wall by installing a rigid support for the support of the inner and outer wall casing (20, 21) in the ground. At this time, if necessary, the inner and outer wall casings 20 and 21 at the predetermined intervals of the horizontal support beams 23 at regular intervals to maintain the gap between the inner and outer wall casings 20 and 21 and to withstand the external stresses. If the excavation is made by disposing the tip casings 20 and 21 by dividing the sections by sections, the tip is formed in such a way that the inner and outer wall casings are closed so that they can withstand the ground stress at both ends of the casing in the longitudinal direction and can be ordered. Casing (20, 21) should be manufactured, and sealant may be injected to block groundwater inflow between adjacent closed tip casing (20, 21) when excavation by section, adjacent closed tip casing (20, 21) 2) The both ends may be cut open so that a welded joint may be formed by applying a steel sheet between the inner and outer wall casings 20 and 21 of the adjacent sections.

Here, the ground excavation work is made between the inner and outer wall casings 20 and 21 at the tip portion, and the space between the inner and outer wall casings 20 and 21 at the tip portion is only required to secure a minimum space for excavation. Therefore, the excavation method is excellent in workability by the manpower excavation or mechanical excavation using the Short Boom / Short Arm Excavator.

In addition, the excavation portion 52 between the casing and the vertical excavation surface 51 for preventing the collapse of the vertical excavation surface 51 and the dispersion of underground stresses acting outside the casing and the friction between the casing and the vertical excavation surface 51 is reduced. ) Is filled with fillers 53 such as fine aggregates and coarse aggregates, and in case of severe groundwater outflow, the groundwater inflow is reduced by filling with soil or clay, and such filling is the inner and outer wall casings (20, 21). When the filler 53 is stacked in advance on each outer surface before excavation, the filler 53 flows naturally into the excavation portion 52 at the same time as the excavation portion 52 is generated during the excavation.

Next, when the excavation of the depth and the excavation of the tip inner and outer wall casing (20, 21) to a certain degree less than the height of the tip inner and outer wall casing (20, 21) is completed, the tip inner and outer wall casing (20, 21) After installing the inner and outer wall casings 30 and 31 of the same length and shape in the upper part, it is preferable to process the welded joint 41 by the joint, but if it is possible to block the inflow of groundwater, The joints between the outer wall casings 20, 21, 30 and 31 are not limited to welding but may be mechanical joints (Fig. 4D).

Excavation at a predetermined depth less than the height of the inner and outer wall casings 20 and 21 at the tip part facilitates welding 41 between the distal end and the inner and outer wall casings 20, 21, 30 and 31 at the intermediate connection part. To work on the ground.

Here, the weld joint 41 between the inner and outer wall casings 20 and 21 of the tip portion and the inner and outer wall casings 30 and 31 of the intermediate portion should be capable of exhibiting strength equal to or greater than that of the casing sphere 10. The upper and lower ends of each of the casings are manufactured so that the welding grooves 40 are formed to correspond to the adjacent casings.

Further, when the weld joint 41 between the inner and outer wall casings 20 and 21 of the tip portion and the inner and outer wall casings 30 and 31 of the intermediate portion is completed, the ground between the inner and outer wall casings 20 and 21 of the tip portion is again formed. Excavation and at the same time as the excavation, the inner and outer wall casing sphere 10 sinks down to the excavation bottom surface 50 (FIG. 5E).

On the other hand, the front end inner and outer wall casing (20, 21) and the intermediate connection inner and outer wall casing (30, 31) is preferably made of a structure having a long length in the transverse direction compared to the height for the purpose of the earth wall construction, The present invention is not limited to the illustrated linear form, and may be manufactured in a curved form or a composite form in which straight lines and curves are mixed according to the design shape of the earth wall.

Finally, after repeating the connection and excavation process to the design depth of the earth wall for the excavation of the underground plaza 70, designing the ground adjacent to the inner wall casing (20, 30) to form the underground plaza 70 space When excavated to, the inner wall casing (20, 30) is exposed to the design depth, the earth wall and the underground plaza 70 using the steel casing of the desired height is completed, the present invention is an earth wall of the front steel casing method excellent in construction and safety Underground square 70 will be excavation method. Further, it is preferable to prevent the inflow of underground water from the underground plaza bottom 73 by placing concrete in close contact with the casing sphere 10 on the base plaza bottom 73 (FIG. 5F).

In addition, when filling the interior of the casing sphere 10, which is the earth wall for the excavation of the underground plaza 70, with concrete 60 or aggregate, it is expected that the effect of increasing the bearing capacity against external underground stress can be expected. 70 can also be used as a foundation or a part of the structure to be constructed, there is an advantage that the removal of the casing sphere 10 is not necessary.

While specific preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and a person skilled in the art to which the present invention pertains has the technical gist of the present invention. Various changes can be made without departing.

1 is a completed cross-sectional view of the underground plaque excavation method according to the invention.

Figure 2 is a perspective view showing a part of an embodiment of the earth wall structure used in the underground plaque excavation method according to the present invention.

3 to 5 is a cross-sectional view showing the procedure of the underground plaque excavation method according to the present invention.

Figure 6 is a construction flow diagram of the underground plaque excavation method according to the present invention.

Explanation of symbols on the main parts of the drawings

10: casing sphere 20, 21: inner and outer wall casing of the tip portion

22: tip casing toe 23: horizontal support beam

30, 31: inner and outer wall casings at intermediate joints 40: weld groove

41: welded joint 50: excavation bottom surface

51: vertical drilling surface 52: overhang

53: Filler 60: Concrete Inside Casing Sphere

70: underground plaza 71: construction work tunnel

72: upper space of the underground plaza 73: bottom of the underground plaza

Claims (5)

(a) Excavating the construction work tunnel 71 horizontally or vertically to excavate the underground plaza 70, and horizontally the upper space 72 of the planned underground plaza to be connected to the end of the construction work tunnel 71 Excavating; (b) mounting the inner and outer wall casings (20, 21) at the predetermined length and height to the earth wall installation position for excavating the underground plaza (70) in the upper space (72) of the underground plaza planned location; (c) Excavating soil is taken out while excavating the ground between the tip inner and outer wall casings 20 and 21, and at the same time as the excavation, the inner and outer wall casings 20 and 21 are excavated with their own weight. Sinking to); (d) When the excavation of the depth to a certain degree less than the height of the tip inner and outer wall casings 20 and 21 and the excavation of the tip inner and outer wall casings 20 and 21 are completed, the tip inner and outer wall casings 20 and 21 are completed. Installing the intermediate inner and outer casings 30 and 31 of the same length and shape on the upper part of the joint), and then joining the joints; (e) When the joint between the inner and outer wall casings 20 and 21 of the tip part and the inner and outer wall casings 30 and 31 of the intermediate part is completed, the ground between the inner and outer wall casings 20 and 21 of the tip part is again excavated. At the same time excavation and the inner and outer wall casing sphere 10 consists of the step to sink down to the excavation bottom surface 50, The inner and outer wall casings (20, 21, 30, 31) of the front end portion and the intermediate connecting portion are underground square excavation method using a steel casing earth wall, characterized in that the steel sheet of high tensile strength and high strength. delete The method of claim 1, The lower end portion 22 of the inner and outer wall casing of the tip portion is an underground square excavation method using a steel casing earth wall, characterized in that V-shaped or inverted trapezoidal shape to facilitate the excavation of the casing to the ground. The method of claim 1, The overhang portion 52 between the casing and the vertical excavation surface 51 for preventing the collapse of the vertical excavation surface 51 and for dispersing ground stresses acting outside the casing and reducing friction between the casing and the vertical excavation surface 51. Excavation of underground squares using a steel casing earth wall further comprises the step of pre-stacking the filler 53 on the outer surface of each of the inner and outer wall casings 20 and 21 of the distal end prior to excavation to fill the filler 53. Method. The method of claim 1, After the connection and excavation process between the inner and outer wall casings (30, 31) of the intermediate connection part is repeated to the design depth of the earth wall for excavation of the underground light field (70), the inner wall casing (20) to form the underground space (70) space And excavating the ground adjacent to the design depth to the design depth, and filling the inside of the casing sphere (10), which is the earth wall, with concrete (60) or aggregate, the underground square excavation method using a steel casing earth wall.

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