KR20170091829A

KR20170091829A - Complex Steel Pipe Structure for Underground Wall and the Construction Method Using the Same

Info

Publication number: KR20170091829A
Application number: KR1020160012386A
Authority: KR
Inventors: 이중재; 박준범
Original assignee: (주)에스텍컨설팅그룹; 주식회사 한구조엔지니어링
Priority date: 2016-02-01
Filing date: 2016-02-01
Publication date: 2017-08-10
Also published as: KR101835828B1

Abstract

The present invention relates to a composite steel pipe structure for constructing an underground outer wall of a building, and a method of constructing an underground outer wall using the same, wherein the composite steel pipe structure comprises at least two steel pipes, a connecting crossbar installed between the steel pipes, And a deck plate fixedly installed between the steel pipes and supported by the connecting cross bar.

Description

Technical Field [0001] The present invention relates to a composite steel pipe structure for an underground outer wall,

The present invention relates to an underground outer wall structure of a building, and more particularly, to an underground outer wall structure for constructing an underground structure, in which an underground outer wall itself is used as an earth retaining wall instead of using a separate temporary earth retaining wall, The present invention relates to a composite steel pipe structure and a method of constructing an underground outer wall using the steel pipe structure.

The increase of the land use rate in the urban area requires the enlargement of the building and the stratification of the stratum. On the other hand, the active utilization of the underground space and the close construction of the land boundary are required.

On the other hand, the structural design for the underground outer wall assumes that both earth pressure and water pressure are received. That is, the underground outer wall totally disregards the function corresponding to the earth pressure and the water pressure of the earth retaining wall. Accordingly, the retaining wall is designed as a viscous structure having rigidity that can resist earth pressure and water pressure during the construction process, After it is built, it is landfilled in the ground.

However, when the underground outer wall and the earth retaining wall are separately constructed, the waste material buried in the ground not only pollutes the environment, but also causes waste of materials. In recent years, the use of the temporary earth retaining wall as a part of the underground outer wall And it is being implemented in such a way that the outer wall is joined to the temporary earthen wall and the whole is formed as the underground outer wall.

FIG. 1 is a cross-sectional view showing an example of constructing an underground outer wall through an abutment wall for a temporary earth retaining wall as described above.

The composite outer wall construction method using the temporary earth retaining wall according to FIG. 1 as a part of the outer wall of the basement is disclosed in Patent Registration No. 10-1122330, wherein (a) a double-faced tape A step of attaching a hypothetical filling material 7a formed by using styrofoam or the like; (b) assembling a hypothetical filler (7b) formed of styrofoam or the like in a reinforcing net inserted into both sides of the H-shaped steel, the hypothetical filler having a certain length along the direction of the outer circumference of the spiral- And then joining the U-shaped reinforcing bar 6b to the reinforcing net to fix the hypothetical filling material to the reinforcing net; (c) deploying an additional main beam (8) if the strength of the reinforcing bar net is insufficient; (d) constructing a hypothetical earth retaining wall by a conventional method with the hypothetical filling material of the H-shaped steel and the reinforcing bar made through steps (a) to (c) facing the inside of the basement; (e) welding the continuous reinforcing bars 6a to the exposed flanges of the H-shaped beams after supporting the temporary earth retaining walls and finishing the soil erosion work, removing the filler materials 7a, 7b; (f) arranging the vertical inner periphery 11 and the horizontal inner periphery 12 of the basement composite outer wall 20 and assembling the formwork to pour the concrete 5.

This prior art sidewall method is positive in that the retained wall is used as a permanent structure wall which becomes a part of the underground outer wall, thereby eliminating the waste of the material. However, In addition to the seam wall construction for the underground outer wall construction, the perforated work, the insertion of the H-shaped steel or wire mesh, and the concrete pouring work on the perforated hole are continuously repeated in units of piles There is a problem that the structural integrity of the sidewall varies depending on the composite force of the shear connection by the continuous reinforcing bars 6a provided in the H section steel and the U-shaped reinforcing bars 6b provided in the reinforcing net , There is a limitation in that the total thickness of the wall due to the sidewall can not be increased.

KR 10-112230 B1

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide an underground wall, which can function as an earth retaining wall to omit a step of constructing a separate earth retaining wall, The present invention provides a composite steel pipe structure capable of constructing an outer wall and a method of constructing an underground outer wall using the same.

According to a most preferred embodiment of the present invention for solving the above-mentioned problems, there is provided a building comprising: at least two or more steel pipes installed on an underground outer wall of a building; a connecting crossbar installed between the steel pipes; And a deck plate supported by the connecting cross bar while being installed, and a stress reinforcing means such as a bracing can be installed in the space between the steel pipes. At this time, any one of the steel pipes located at the outermost side of the steel pipe is provided with an arc-shaped concave groove concaved inward, so that the steel pipe of the adjacent composite steel pipe structure can be inserted so as to be rotatable. The lower surface of the frame beam provided between the upper and lower frames.

According to another embodiment of the present invention, a grouting pipe equipped with a logic turn valve is attached to one of the steel pipes located at the outermost of the steel pipes, or a water cut-off rib is installed in the longitudinal direction of the steel pipe, There is provided a composite steel pipe structure having a waterproof reinforcement means such as a temporary filler material provided on the inner surface of the rib.

According to another embodiment of the present invention, there is provided a method of manufacturing a composite steel pipe structure, comprising the steps of: a) forming a trench-like installation space in the ground so that a composite steel pipe structure can be installed in the ground and injecting a fluid- b) inserting the composite steel pipe structure into the installation space before the curing material is cured; c) repeating the above steps a) and b) in order to continuously install each composite steel pipe structure at the location of the basement outer wall of the building; d) removing the cured material on the entire surface of the composite steel pipe structure while rolling a part of the space defined by the composite steel pipe structure; e) installing a bracket on an outer surface of the exposed steel pipe of the composite steel pipe structure, constructing a slab by using the bracket and a slab adjacent to the rim; and f) repeating the above steps d) and e) in order to complete the basement exterior wall while constructing the building in a reverse type manner, and a method of constructing the underground exterior wall using the composite steel pipe structure.

The present invention eliminates the need for a separate temporary earth retaining wall to simplify field work by eliminating the need for a process, and enables construction of an underground structure that is economical due to manpower and material reduction and shortening of air, There is no room for environmental pollution.

In addition, since the structure for underground outer wall is manufactured in a factory, it is possible to provide high quality and easy installation work in the field, so that the precision of construction can be achieved.

Further, the present invention facilitates stress reinforcement on the underground outer wall even after long-term use of the building, thereby improving the durability and enabling a double wall structure without using a separate space, thereby minimizing energy loss.

FIG. 1 is a cross-sectional view showing an example of constructing an underground outer wall through an abutment wall for a temporary earth retaining wall as described above.
2 is a perspective view showing a first embodiment of a composite steel pipe structure according to the present invention.
3 is a perspective view and a cross-sectional view showing a shape in which a frame beam is provided on the upper side of the connecting crossbar of the composite steel pipe structure.
4 is a perspective view of each of the embodiments in which the composite steel pipe structure is provided with the stress reinforcing means.
5 and 6 are perspective views of respective embodiments in which the composite steel pipe structure is provided with means for waterproof reinforcement.
7 is a perspective view showing a second embodiment of a composite steel pipe structure according to the present invention.
8 to 13 are an exploded perspective view and a cross-sectional view illustrating respective steps of constructing an underground outer wall using a composite steel pipe structure according to a second embodiment of the present invention.
FIGS. 14 and 15 are sectional views showing steps of waterproofing and reinforcing the composite steel pipe structures using the means shown in FIGS. 5 and 6.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in order to obscure or obscure the technical idea of the present invention due to the detailed description of the known structure in describing the present invention, the description of the structure of the above known structure will be omitted.

The composite steel pipe structure 100 according to the present invention is a unit module of the underground outer wall W and is constructed in a factory and is installed in the ground in a plurality of the inner wall W Fig. 2 shows a first embodiment of such a composite steel pipe structure 100. As shown in Fig.

As shown in FIG. 2, the composite steel pipe structure 100 of the present invention has a steel pipe 110, a connecting bar 120, and a deck plate 130 as a basic structure.

The steel pipe 110 is vertically installed in the ground to transmit the earth pressure acting on the back surface of the deck plate 130 to the slab 400 described later to function as a supporting structure of the underground outer wall W to achieve structural stability On the other hand, as a means for connecting to the adjacent composite steel pipe structure 100.

The steel pipe 110 is necessarily located at both ends of the composite steel pipe structure 100. At least two steel pipes 110 are installed in the composite steel pipe structure 100 as a unit module.

A connecting cross bar 120 is installed between the plurality of steel pipes 110.

The connecting crossbar 120 is installed horizontally between the steel pipes 110 and supports the earth pressure of the back surface of the deck plate 130 while maintaining the shape of the composite steel pipe structure 100, And disperses evenly. Thus, the rear side of the connecting crossbar 120 is disposed in contact with the front surface of the deck plate 130.

The connecting cross bar 120 may be composed of various length members such as pipes, but most preferably consists of a vertical flange and a web 121a between them, and at least two Or more.

On the front surface of the composite steel pipe structure 100 installed in the ground, a frame beam 300 for dispersing the back earth pressure and constructing the slab 400 is installed in the horizontal length direction of the composite steel pipe structure 100, Is positioned so that the bottom surface of the frame beam 300 is in contact with the bottom surface of the frame beam 300.

The cross bar 120 positioned to be in contact with the lower surface of the frame beam 300 can be utilized as a form for installing the frame beam 300 or as a means for supporting the form. For this purpose, it is preferable to attach the flat steel pipe 121 to the steel pipe 110 such that the flat surface of the steel pipe 121 constituting the connecting crossbar 120 is positioned on the upper side, that is, the web 121a is positioned on the upper side.

FIG. 3 shows a configuration in which a frame beam 300 is provided on the top surface of the connecting crossbar 120 composed of the d-shaped section 121 as described above.

In this case, in order to secure the structural integrity of the connecting bar 120 and the frame beam 300, the web 121a of the beam 121 may be further provided with a shear connection member 122 to be embedded in the frame beam 300.

As described above, the deck plate 130 is installed on the rear surface of the steel pipe 110 and the connecting bar 120 to form an underground outer wall W. During the construction of the underground structure, Thereby making it possible to omit the step of installing the temporary earth retaining wall.

Accordingly, the deck plate 130 should have a cross-sectional shape favorable to compression buckling with respect to horizontal load, bending, shear force, and vertical load. Preferably, the deck plate 130 is applied with a corrugated deck plate 130, The thickness is set in consideration of not only the degree of rigidity but also the seismic performance of the constructed building.

In addition, a separate stress strengthening means 140 may be further provided at a position where the shear force greatly acts, and FIG. 4 illustrates each of the stress strengthening means 140.

The stress augmenting means 140 may be provided so as to protrude out of the steel pipe 110. However, as shown in Fig. 4, the stress augmenting means 140 is disposed in a space formed between the steel pipes 110, , So as not to lower the indoor space utilization rate.

The stress augmenting means 140 may be a bracing 141 installed between the steel pipes 110 as shown in Fig. 4 (a) Or may be a front wall 142 installed in a space formed by the deck plate 130 and between the steel pipes 110 as shown in FIG.

The stress reinforcing means 140 may be provided together at the time of manufacturing the composite steel pipe structure 100 at the factory or may be installed during the process of constructing the underground outer wall W by installing the composite steel pipe structure 100 at the site Do.

Further, when maintenance and reinforcement of the underground outer wall W is required due to deterioration even after long-term use of the building, it is possible to reinforce the stress through spaces formed between the steel pipes 110 and the tech plate, It brings effect.

In addition, the space formed between the steel pipes 110 and the tech plate enables a double wall structure without requiring a separate space, thereby minimizing the energy loss due to the improvement in the heat insulation property.

A plurality of the composite steel pipe structures 100 of the present invention are continuously installed to form an outer wall of an underground structure. The connection portion J of the composite steel pipe structures 100 has a waterproof function It can be vulnerable. Therefore, waterproof reinforcement means capable of sufficiently securing a waterproof function for the connection portion J can be further provided in the composite steel pipe structure 100.

The waterproof reinforcement means may be implemented in various ways such as interposing a waterproof sheet. Among them, grouting method and a method of adjusting the position (C) of the waterproof layer (R) are known.

5 and 6 are views showing an example in which the means for waterproofing reinforcement is provided in the composite steel pipe structure 100. As shown in FIG.

First, the waterproof reinforcement by the grouting method is performed by grouting the back surface gravel located at the joint portion J of each composite steel pipe structure 100.

For this purpose, as shown in FIG. 5, a grouting pipe 111 having a plurality of grout re-jetting holes 111a is disposed in one of the steel pipes located at the outermost one of the steel pipes 110 constituting the composite steel pipe structure 100. [ Respectively.

The grouting pipe 111 enters the installation space S formed in the ground with the composite steel pipe structure 100 entering the installation space S in the ground, The tip end has a closed shape so that the hardening material 200 penetrates into the grouting tube 111 and is not closed.

In addition, the grout re-jetting hole 111a may be prevented from penetrating the fluid curing material 200 through taping. Preferably, the grouting material may be opened only when the grout material G is jetted to the outside, The turn valve 111b is installed in each injection hole to prevent the fluid curing material 200 from penetrating into the grouting pipe 111. [

This waterproofing method by grouting is expected to enhance the rigidity with respect to the connecting portion J as well as the adjoining ground stabilization by consolidating the back surface gravel in addition to the waterproof function to the connecting portion J.

Next, the waterproof reinforcement by a method of adjusting the position of the joint C is performed by connecting the joint C of the waterproof layer R formed by the hardened material 200 to the joint portion of the composite steel pipe structures 100 J) and has a shape structure in which the flow of water between them can not be easily made.

To this end, the composite steel pipe structure 100 is further provided with a water cutting rib 112 and a temporary filler material 113 as shown in FIG.

The water rupture rib 112 is located between the joint C of the waterproof layer R and the joint J of the composite steel pipe structure 100 and is located at the joint J The temporary filler material 113 is installed on the inner side surface of the water cut-off rib 112 and is disposed on the wall surface S of the installation space S, (C) position of the waterproof layer (R) while setting the outer surface of the steel pipe (110) to cut the hardened material (200).

The construction joint C of the curing material 200 forming the waterproof layer R should be spaced apart from the water breaking rib 112 by a predetermined distance. Is set by the thickness of the temporary filler material (113) provided inside.

The temporary filler material 113 may be of a tubular shape that can be easily removed in the future. For example, the temporary filler material 113 may be filled with a fluid such as water or air. The temporary filler material 113 in the form of a tube can be easily removed by discharging the fluid in the future.

A concrete description of the waterproofing and reinforcement work by each of the above means will be explained together with the construction method of the underground outer wall W in the back.

7 shows a composite steel pipe structure 100 according to a second embodiment of the present invention.

In the composite steel pipe structure 100 according to the first embodiment of the present invention, as shown in FIG. 2, the outermost steel pipes 110 have a circular cross section. In the second embodiment, In the same way, any one steel pipe 110 located at the outermost position is different in that an arc-shaped engaging groove 110a concaved inward is provided. The arc-shaped engaging groove 110a may be provided forward or may be provided at a predetermined angle with respect to the width direction of the composite steel pipe structure 100. [

The steel pipe 110 of the adjacent composite steel pipe structure 100 is rotatably inserted into the arc shaped engagement groove 110a so that the two composite steel pipe structures 100 have a hinge connection structure, In addition to improving the bonding strength and waterproofness between the outer wall portion and the outer wall portion.

The remaining configuration of the second embodiment is not different from that of the first embodiment, and a description thereof will be omitted.

8 to 13 illustrate a composite steel pipe structure 100 according to a second embodiment of the present invention, and illustrate the construction method of the underground outer wall W using the same.

As shown in FIGS. 8 to 13, the method for constructing the underground outer wall W without the construction of the temporary earth retaining wall by using the composite steel pipe structure 100 of the present invention comprises the steps of: a) B) installing the composite steel pipe structure 100 in the installation space S; c) repeating the operation of forming the installation space S and inserting the composite steel pipe structure 100; d) E) removing the cement material (200), removing the cement material (200), e) removing the cement material (200) 300) and the slab (400) are repeated. Each step will be described as follows.

a) forming an installation space S or the like in the ground (Fig. 8);

A step of forming an installation space S in which a composite steel pipe structure 100 for an underground outer wall W can be installed in the ground is firstly excavated in the form of a trench using an excavation equipment or a perforating equipment, The gravel in the work space of the installation space S is disturbed using the auger and then the hardening material 200 is injected.

For example, when the work section is excavated, the stability of the wall is secured by inserting the stabilizing liquid so that the wall in the installation space S is not collapsed, and after the excavation is completed, the stabilizing liquid is substituted by the hardening material 200.

The hardening material 200 forms a waterproof layer R to prevent corrosion of the deck plate 130 and to stabilize soil adherence on the back surface. The hardened material 200 has fluidity with waterproof property, And the waterproof layer R is not easily broken by maintaining a predetermined strength, and most preferably comprises a bentonite liquid and cement.

b) installing the composite steel pipe structure 100 in the installation space S (Fig. 9);

When the installation space S is formed, a composite steel pipe structure 100 previously prepared in the factory is inserted into the installation space S. Thus, the composite steel pipe structure 100 has a shape embedded in the cured material 200. Accordingly, the hardened material 200 is filled in the steel pipe 110 of the composite steel pipe structure 100. This is because the effect of the concrete filled steel tube (CFT) that greatly increases the flexural rigidity and buckling rigidity of the steel pipe 110 is exhibited do.

Of course, the operation of inserting the composite steel pipe structure 100 should be performed before the cured material 200 injected into the installation space S is cured.

The composite steel pipe structure 100 is further provided with means for securing a waterproof property of the joint portion J with the adjacent composite steel pipe structure 100 in a later step, Which will be described separately.

c) repeating the installation space S formation operation and the insertion operation of the composite steel pipe structure 100 (Fig. 10);

When the operation of installing the composite steel pipe structure 100 in any one of the sections of the ground is completed, another second installation space S is formed adjacent to the installation space S by the method of step a) The composite steel pipe structure 100 is inserted by the method of step b), and the operations of the steps a) and b) are sequentially repeated to form the composite steel pipe structure 100 at the location of the underground outer wall W of the building, Respectively.

d) some Sulk And removing the curing material 200 (Fig. 11);

When the installation work of the composite steel pipe structure 100 to the ground is completed by the step c), the space partitioned by the composite steel pipe structure 100 is thrown out. At this time, on the front surface of the composite steel pipe structure 100 The cured material 200 located thereon is also removed, thereby allowing the entire surface of the composite steel pipe structure 100 to be exposed to the outside.

The waterproof layer R is formed by the hardening material 200 on the rear surface of the composite steel pipe structure 100. The steel pipe 110 and the deck plate 130 are formed on the front surface of the composite steel pipe structure 100, A space can be formed by the stress reinforcing means 140 in the space, as described above.

The work of this step is performed sequentially with the work of the other stages in units of each layer of the underground in a reverse type manner, and the removal of the excrement and the hardened material 200 is performed by the composite steel pipe structure 100 It is made part of the space.

e) constructing the frame beam 300 and the slabs 400 on the composite steel pipe structure 100 (Fig. 12);

The bracket 115 for building the frame beam 300 is installed on the outer surface of the exposed steel pipe 110 of the composite steel pipe structure 100 after the removal of the vulcanized and hardened material 200 is completed And the slab 400 is constructed by using the bracket 115 to extend to the frame beam 300 and the frame beam 300.

The frame beam 300 disperses various horizontal loads acting on the composite steel pipe structures 100 while structurally integrating the entirety of the composite steel pipe structure 100 forming the underground outer wall W, So that the support of the load by the action of the steel film of the slab 400 is achieved.

f) some Sulk , Removing the hardening material (200), constructing the frame beam (300), and constructing the slab (400) (FIG. 13);

When the construction of the frame beam 300 and the slabs 400 for one of the layers is completed, the bottom of the d) step and the curing material 200 are removed with respect to the lower part of the frame beam 300 and the slab 400, (400) is repeated in order to build a building in a backward manner, thereby completing the underground outer wall (W).

The underground outer wall W can be constructed without separately constructing a temporary earth retaining wall by each of the steps described above. However, the underground outer wall W is formed by dividing the width of one composite steel pipe structure 100 into a unit of a work section 14 and 15 show a state in which the waterproof reinforcement is applied to the connection portion of the work section in order to more reliably secure the function as the underground outer wall W, Each embodiment of a waterproof reinforcement is shown stepwise.

The waterproof reinforcement according to the embodiment of FIG. 14 is applied with the grouting waterproofing means or the similar grouting waterproofing means shown in FIG. 5, i) simultaneously with the operation of continuously installing the composite steel pipes in the step c) The composite steel pipe structures 100 are connected to each other and are immediately connected to each other and then the grout of the back surface of the connecting portion J is immediately grouted; or ii) through the operation of step c), the composite steel pipe structure 100 After all the installation work is completed, grouting is performed on the back surface gravel of the joint part J of each of the composite steel pipe structures 100 before the work of the step d) proceeds.

The composite steel pipe structure 100 to be inserted into the installation space S in step b) is preferably a composite steel pipe structure 100 having a grouting pipe 111 attached thereto, A separate grouting pipe 111 may be used.

The grout material G injected through the grouting pipe 111 grouts the soil on the back surface through the construction joint C of the waterproof layer R by the hardening material 200 to form the joint C So that the groundwater can not flow through.

The waterproof reinforcement according to the embodiment of FIG. 15 uses a composite steel pipe structure 100 having a water breaking rib 112 and a temporary filler material 113 as shown in FIG. 6, And a process of continuously installing the steel pipe structure 100.

(I) a composite steel pipe structure 100 in which a water-splitting rib 112 and a temporary filler material 113 are disposed is inserted into an installation space S into which the hardening material 200 is injected, (Fig. 15 (a)), ii) when performing a drilling operation to form another installation space S adjacent to the preceding installation space S, The trailing installation space S is extended to the position where the temporary filler material 113 is removed by removing the temporary filler material 113 and the hardening material 200 outside the water breaking ribs 112 (b)}. Iii) The curing material 200 is then injected into the rear installation space S as described above so that the position of the installation joint C is set to be spaced apart from the water rupture rib 112 by a predetermined distance (Fig. 15 (c)).

Therefore, even if the groundwater penetrates through the joint C of the waterproof layer R by the hardened material 200, it is cut off again by the water cut-off rib 112, so that waterproof performance can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it will be possible to carry out various modifications thereof. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

100; Composite steel pipe structure 110; Steel pipe
110a; Arc-shaped engaging groove 111; Grouting pipe
111a; Grout re-injection hole 111b; A logic turn valve
112; Water break rib 113; Temporary filler material
115; Bracket 120; Connection crossbar
121; Shaped sections 121a; Web
122; Shear connector 130; Deck plate
140; Stress reinforcing means 141; Bracing
142; Shear wall 200; Hardening material
300; Frame beam 400; Slab
W; Underground outer wall G; Grout
C; Construction J; Composite steel pipe structure connection part
R; Waterproof layer S; Installation Space

Claims

(W) of a building,
(120) installed between the steel pipes (110), a deck plate (120) fixedly installed between the steel pipes (110) and supported by the connecting crossbar (120), at least two steel pipes 130). &Lt; / RTI >

The steel pipe (110) according to claim 1, wherein one of the steel pipes (110) located on the outermost side of the steel pipe (110) is provided with an arc-shaped engaging groove (110a) Wherein the reinforcing member is inserted to be rotatable.

The connecting bar (120) according to claim 1, wherein the connecting bar (120) is formed of a U-shaped steel pipe (121), and the bottom surface of the frame beam (300) Composite steel pipe structure for.

The composite steel pipe structure for an underground outer wall according to claim 1, wherein a bracing (141) or a front end wall (142) is provided between the respective steel pipes (110).

2. The apparatus according to claim 1, wherein a grouting pipe (111) having a logic turn valve (111b) is attached to one of the steel pipes (110) located at the outermost of the steel pipes (110) Composite steel pipe structure.

2. The water treatment system according to claim 1, wherein a water-cutting rib (112) is provided in a longitudinal direction of one of the steel pipes (110) positioned at the outermost of the steel pipes (110) (113) is provided on the outer wall of the composite steel pipe structure.

A method for constructing an underground outer wall (W) of a building using the composite steel pipe structure (100) for underground outer wall according to any one of claims 1 to 4,
a) forming a trench-shaped installation space S in the ground so that the composite steel pipe structure 100 can be installed in the ground, and injecting a fluid-curable material 200 having waterproof property into the installation space S;
b) inserting the composite steel pipe structure 100 into the installation space S before the curing material 200 is cured;
c) successively repeating the steps a) and b) above to continuously install each composite steel pipe structure 100 at the location of the underground outer wall W of the building;
d) removing the cured material (200) on the entire surface of the composite steel pipe structure (100) while rolling a part of the space defined by the composite steel pipe structure (100);
e) a bracket 115 is installed on the outer surface of the exposed steel pipe 110 of the composite steel pipe structure 100 and the edge beam 300 and the slab opening on the edge beam 300 by using the bracket 115 400);
f) repeating the above steps d) and e) in order to complete the underground outer wall W while constructing the building in a reverse type manner.

The method according to claim 7, wherein the installation space S formed in the step a) is constructed such that the gravel in the work space for the installation space S is disturbed by using a uniaxial or triaxial auger, Wherein the curing material (200) injected into the cementitious material (200) comprises a bentonite liquid and cement.

The method as claimed in claim 7, further comprising the step of grouting the back surface of the joint part (J) of each composite steel pipe structure (100) between the step c) and the step c) A method of constructing a building underground using a composite steel pipe structure.

The composite steel pipe structure (100) according to claim 7, wherein in step (b), the composite steel pipe structure (100) inserted into the installation space (S) And is inserted into the installation space S in a state where the temporary filler material 113 is installed on the inner surface of the water cutting rib 112,
The temporary filler material 113 in the preceding installation space S and the outer side of the water-splitting rib 112 are separated from each other in the preceding installation space S, Of the cured material (200) is removed together with the cured material (200).