KR100776964B1 - underground wall earth retaining structure by prestressed steel pipe and excavation construction method of having used this - Google Patents

Abstract

The present invention does not use an H beam, but instead uses a large diameter compressed steel pipe of about 500 to 1500 mm in diameter to resist against earth pressure and water pressure in a continuous continuous wall. The purpose of the present invention is to provide an underground continuous wall mud structure and a method of excavation using compressed steel pipe that can ensure stability and maintain stability of the underground continuous wall even with a relatively small amount of installation.

Underground continuous wall mud structure using the compressed steel pipe according to the present invention for achieving the above object is an underground continuous wall integrally formed with a predetermined thickness and depth along the boundary of the target ground; A plurality of fixing units installed in the basement continuous wall via anchor bolts; At the same time welded across the fixing unit is characterized in that the support material consisting of a compression steel pipe.

In addition, the underground continuous wall oyster excavation method using a compressed steel pipe according to the present invention for achieving the above object comprises the steps of installing a guide wall along the boundary of the target ground (I); Excavating an inner side of the guide wall to a predetermined depth by using an excavation equipment to form an excavation hole (II); Stabilizing the inside of the excavation hole with a stabilizer (III); Inserting a reinforcing bar assembly into the excavation hole by using a lifting device (IV); (V) forming an underground continuous wall by inserting a trem tube into the excavation hole into which the reinforcing bar assembly is inserted, and drawing concrete while drawing the trem tube upwards from the bottom of the excavation hole; In the underground continuous wall mudstone gulting method comprising the step (VI) of installing the H beam on the upper end of the underground continuous wall, the step of fixing a plurality of fixing parts to the underground continuous wall (Ⅶ); It characterized in that the step (Ⅷ) of fixing the support material made of compressed steel pipe across the fixing unit.

Compressed steel pipe, underground continuous wall, earth block structure, gulting method

Description

Underground wall earth retaining structure by prestressed steel pipe and excavation construction method of having used this}

1 is a plan view showing a state of joining the underground continuous wall and the compressed steel pipe with a concrete block according to the present invention,

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B of FIG.

4 is an enlarged detailed view of a portion “A” of FIG. 1;

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a cross-sectional view taken along the line B-B of FIG.

7 is an enlarged detailed view of a portion “B” of FIG. 1;

8 is a cross-sectional view taken along the line A-A of FIG.

9 is a cross-sectional view taken along line B-B of FIG. 8;

10 is a cross-sectional view taken along the line C-C of FIG.

11 is a cross-sectional view taken along the line D-D of FIG. 10;

12 is an enlarged detailed view of a portion “C” of FIG. 1;

FIG. 13 is a cross-sectional view taken along the line A-A of FIG. 12; FIG.

14 is an enlarged detailed view of a portion “D” of FIG. 1;

15 is a front view showing a reinforcing bar assembly installed on the continuous underground wall according to the present invention,

16 is a plan view showing a reinforcing bar assembly installed on the continuous wall of the underground according to the present invention,

17 is a cross-sectional view taken along the line A-A of FIG. 15;

18a to 18h is a process diagram showing step by step construction of underground continuous wall retaining wall using a compressed steel pipe according to the present invention,

19 is an elevation view showing a state of joining the underground continuous wall and the compressed steel pipe with steel frame according to the present invention,

20 is a plan view showing a state of joining the underground continuous wall and the compressed steel pipe with steel frame according to the present invention,

Figure 21 is a cross-sectional view showing a state of joining the underground continuous wall and the compressed steel pipe with steel frame according to the present invention.

Explanation of symbols on the main parts of the drawing

100: continuous continuous wall 200: fixing unit

210: reinforced concrete block 212: rebar

214: concrete 220: connection

222: bracket 230: flat jack

233: flat jack support plate 240: plate

250: anchor bolt 300: fixing unit

310: steel member 320: plate

322: circular hole 330: connecting member

350: anchor bolt 400: support

410: compressed steel pipe

B: H beam C: capping part

G: Ground GW: Guide Wall

H: Excavator L: Stabilizer

S: Rebar assembly T: Tremi tube

The present invention relates to an underground continuous wall retaining structure and a method of excavation using compressed steel pipe, and in particular, does not use the H beam as a support material, and instead of using a large diameter compressed steel pipe having a diameter of about 500-1500 mm, The present invention relates to an underground continuous wall retaining structure using a compressed steel pipe that is resistant to hydraulic pressure, and a method of excavation.

There are three main types of support for earthquake temporary installations.

The first type is divided into general support type using H beam type, second type support type using ANCHOR, and third type support type using SLAB.

Here, the support type using the underground anchor, which is the second support type of the wall support type, is avoided because there are many limiting factors such as various surrounding ground conditions and the presence or absence of adjacent structures in the site, and the third support type slab The support type using the H-beam is disadvantageous in terms of economics, and the first support type using the H beam is generally the most widely used.

However, since the shape of the cross section has a relatively small cross-sectional coefficient compared to the area, the H-beam support type is mainly applied to a distance of less than 30m because the resistance against applied compressive force adversely affects the buckling field. In addition, the use of H-beams is relatively long between more than 50 ~ 60m.

In addition, in order to reduce the buckling length of the H beam and to withstand the weight of the strut, the post pile should be pre-installed at a predetermined interval prior to arranging the strut. It is becoming.

Therefore, the present invention was devised to solve the problems described above, and does not use the H beam, but instead of using the large diameter compressed steel pipe of about 500 to 1500mm in diameter to the earth pressure and water pressure of the continuous wall underground As a resistive method, it is possible to secure high stability against compressive force even in a relatively large buckling field, and underground continuous wall mud structure using compressed steel pipe to maintain the stability of the underground continuous wall even if the installation quantity is relatively small. And to provide a method of gulting its purpose.

Underground continuous wall mud structure using the compressed steel pipe according to the present invention for achieving the above object is an underground continuous wall integrally formed with a predetermined thickness and depth along the boundary of the target ground; A plurality of fixing units installed in the basement continuous wall via anchor bolts; At the same time welded across the fixing unit is characterized in that the support material consisting of a compression steel pipe.

In addition, the underground continuous wall oyster excavation method using a compressed steel pipe according to the present invention for achieving the above object comprises the steps of installing a guide wall along the boundary of the target ground (I); Excavating an inner side of the guide wall to a predetermined depth by using an excavation equipment to form an excavation hole (II); Stabilizing the inside of the excavation hole with a stabilizer (III); Inserting a reinforcing bar assembly into the excavation hole by using a lifting device (IV); (V) forming an underground continuous wall by inserting a trem tube into the excavation hole into which the reinforcing bar assembly is inserted, and drawing concrete while drawing the trem tube upward from the bottom of the excavation hole (V); In the underground continuous wall mud excavation method comprising the step (VI) to form a capping portion by installing an H beam on the upper end of the underground continuous wall,

(Iv) fixing a plurality of fixing units to the underground continuous wall; It characterized in that the step (Ⅷ) of fixing the support material made of compressed steel pipe across the fixing unit.

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

1 is a plan view showing a state of joining the underground continuous wall and the compressed steel pipe with a concrete block according to the present invention, Figure 2 is a cross-sectional view taken along line AA of Figure 1, Figure 3 is a cross-sectional view taken along line BB of Figure 2, Figure 4 1 is an enlarged view of portion "A" of FIG. 1, FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, FIG. 6 is a cross-sectional view taken along line BB of FIG. 5, and FIG. FIG. 8 is a sectional view taken along the line AA of FIG. 7, FIG. 9 is a sectional view taken along the line BB of FIG. 8, FIG. 10 is a sectional view taken along the line CC of FIG. 7, and FIG. 11 is a sectional view taken along the line DD of FIG. 10. FIG. 12 is an enlarged view of portion "C" of FIG. 1, FIG. 13 is a cross-sectional view taken along line AA of FIG. 12, FIG. 14 is an enlarged view of portion "D" of FIG. 1, and FIG. Reinforcing bar assembly is installed in the basement continuous wall according to the present invention is a front view, Figure 16 is a plan view showing the reinforcing bar assembly installed in the basement continuous wall according to the present invention , Figure 17 is a cross-sectional view taken along the line A-A of Fig.

As shown in these drawings, the underground continuous wall mud structure using the compressed steel pipe according to the present invention includes an underground continuous wall (100) integrally formed with a predetermined thickness and depth along the boundary line of the target ground (G); A plurality of fixing units 200 and 300 installed on the base continuous wall 100 through a plurality of anchor bolts 250 and 350; At the same time welding is installed across the fixing unit (200, 300) is composed of a support member 400 made of a compressed steel pipe (410).

That is, the underground continuous wall retaining structure using the compressed steel pipe according to the present invention is a structure in which the underground continuous continuous wall 100, the fixing unit 200 and the support member 400 are organically combined.

Here, the underground continuous wall 100 is installed to the guide wall (GW) along the boundary surface of the target ground (G), by excavating the inside of the guide wall (GW) to a predetermined depth using the excavation equipment After the excavation hole (H) is formed, the excavation hole (H) is stabilized with a stabilizing liquid (L) such as bentonite, and then the rebar assembly (S) is inserted into the excavation hole (H) using a lifting device. Then, after inserting the tremi tube (T) in the excavation hole (H), and cast the concrete while drawing up the tremi tube (T) upward from the bottom of the excavation hole (H), when cured as a wall Prevent the collapse of the ground.

In addition, the fixing unit 200 includes a reinforced concrete block 210 formed by pouring concrete 214 in a cross-sectional shape having a predetermined thickness and width at the same time as the reinforcing bar 212 is embedded therein; A connection part 220 fixedly installed on the reinforced concrete block 210 and having brackets 222 formed at both sides thereof; A flat jack 230 disposed on the surface of the connection part 220 and exerting a predetermined pressure (pressure range 300 to 700 tons); It consists of a flat jack support plate 233 disposed below the flat jack 230 and a plate 240 welded on the flat jack 230.

That is, the fixing unit 200 is the reinforced concrete block 210, the connecting portion 220, the flat jack 230 and the plate 240 is organically coupled, and then installed in the underground continuous wall 100 is compressed steel pipe 410 serves to fix and support.

Here, the reinforced concrete block 210 is a structure consisting of a combination of the reinforcing bars 212 and concrete 214, when the block is made of concrete only, because the concrete is weak to the tension side to increase the structural strength Reinforcing bar is inserted in the receiving part and it is structured to work integrally with external force.

In particular, the reinforced concrete block 210 should be fixed to the underground continuous wall 100 so as not to move, and the load acting on the underground continuous wall 100 should be distributed to the reinforced concrete block 210.

In addition, the connection portion 220 is a steel structure having a bracket 222 formed on both sides, and is fixed on the reinforced concrete block 210, and serves to support the compressed steel pipe 410.

In addition, the flat jack 230 is a sealed circular jack that joins two thin mild steel plates, and is disposed between the connecting portion 220 and the plate 240 in which the compressed steel pipe 410 is disposed for the introduction of the prestressing force. In order to press the steel pipe at the same time and pressurize it at a certain pressure by connecting it to the hydraulic pump, and when it is necessary to fix it while it is in operation, the non-shrink mortar or epoxy resin is injected.

That is, the flat jack 230 compresses the steel pipe 410 and has a structure in which the underground continuous wall 100 at both ends of the steel pipe 410 is fixed to the steel pipe 410 without a separate support material. This is to adjust the reaction force against earth pressure and water pressure acting in the.

In addition, the flat jack 230 is an economical arrangement structure so that the same action force can be exerted even if only installed on either end of the compression steel pipe 410 in general.

The plate 240 is a general rectangular steel sheet.

On the other hand, the support material 400 is a structure in which a plurality of large diameter compressed steel pipe 410 of about 500 ~ 1500mm in diameter is installed.

Such support material 400 is fixed to both ends of the compressed steel pipe 410 is fixed to the fixing unit 200 across the fixing unit 200 provided between the underground continuous wall 100, the underground continuous wall 100 is earth pressure It acts as a brace to prevent falling or collapsing.

Hereinafter, the construction of the underground continuous wall mud using the compressed steel pipe according to the present invention having the configuration as described above.

18A to 18H are process diagrams showing step-by-step construction of underground continuous wall retaining wall using compressed steel pipe according to the present invention.

As shown in these drawings, the underground continuous wall mud excavation method using the compressed steel pipe according to the present invention comprises the steps of installing the guide wall (GW) along the boundary surface of the target ground (G); Forming an excavation hole (H) by digging an inner side of the guide wall (GW) to a predetermined depth by using an excavation equipment; Stabilizing the inside of the excavation hole (H) with a stabilizer (III); Inserting reinforcing bar assembly S into the excavation hole H using a lifting device (IV); After inserting the tremi tube (T) into the excavation hole (H) into which the reinforcing bar assembly (S) is inserted, while pouring the tremi tube (T) upward from the bottom of the excavation hole (H), the concrete continuous wall Forming (100) (V); In the underground continuous wall mud excavation method comprising the step (VI) of forming the capping portion (C) by installing the H beam (B) on the upper end of the underground continuous wall (100),

(Ⅶ) fixing a plurality of fixing units (200, 300) to the underground continuous wall (100); It consists of a step (Ⅷ) of fixing the support member 400 made of a compressed steel pipe 410 across the fixing unit (200, 300).

Here, the installation step (설치) of the fixing unit 200 is the upper surface of the reinforced concrete block 210 formed by curing the concrete 214 in the cross-sectional shape having a predetermined thickness and width at the same time as the reinforcing bar 212 is embedded therein Install the connecting portion 220, the bracket 222 is formed on both sides in the installation, and install the flat jack 230 to exert a predetermined pressure on the surface of the connecting portion 220, the plate 240 on the flat jack 230 After welding), the reinforced concrete block 210 is fixed to the underground continuous wall 100 by the anchor bolt 250.

In addition, in the installation step (Ⅷ) of the support material 400, the compressed steel pipe 410 is welded to the plate 240 of the fixing unit 200, and the pressure is increased to the flat jack 230 of the fixing unit 200. While supporting the compressed steel pipe 310 is fixed installation, without the need for a separate support beam or post pile (Post Pile).

That is, the underground continuous wall mud excavation method using the compressed steel pipe according to the present invention is installed guide wall (GW) along the boundary surface of the target ground (G), using the excavation equipment on the inside based on the guide wall (GW) After excavating to a predetermined depth to form an excavation hole (H), and stabilizes the excavation hole (H) with a stabilizer (L), such as bentonite, and then the reinforcing bar (S) in the excavation hole (H) After inserting using a lifting device, insert the tremi tube (T) into the excavation hole (H) in which the reinforcing bar assembly (S) is inserted, and then raise the tremi tube (T) from the bottom of the excavation hole (H) After pouring concrete to form a continuous wall (100) to form an underground, H-beam (B) is installed on the upper end of the underground continuous wall 100 to form a capping part (C),

Reinforced concrete block 210 is installed in the basement continuous wall 100, the reinforcement concrete block 210 is formed by the concrete 214 is poured into a cross-sectional shape having a predetermined thickness and width at the same time the reinforcing bar 212 is embedded therein On the upper surface of the) is installed a connecting portion 220, the bracket 222 is formed on both sides, and installs a flat jack 230 for exerting a predetermined pressure on the surface of the connecting portion 220, on the flat jack 230 After the welding of the plate 240, the reinforced concrete block 210 is fixed to the underground continuous wall 100 by anchor bolts 250,

While fixing the support member 400 made of the compressed steel pipe 410 across the fixing unit 200, 300, the welding of the compressed steel pipe 410 to the plate 240 of the fixing unit 200, The pressure is applied to the flat jack 230 of the fixing unit 200 to be fixed and installed while supporting the compressed steel pipe 310.

Underground continuous wall retaining structure and oyster method using the compressed steel pipe made of the configuration and construction as described above is a compressed steel pipe 410 by applying a large prestressed load of about 200 ~ 300 tons / place to the flat jack 230 prior to the stepped pit By generating a compressive force in the axial direction of the support member 400, when the compressed steel pipe 410, which is the support member 400 is installed between the underground continuous wall 100 to prevent sagging down by its own weight, Due to the weight of the compressed steel pipe 410 itself during the underground excavation work inside the wall 100 prevents the compressed steel pipe 410 support material 400 is separated from the underground continuous wall 100.

In addition, the initial compressive force applied to the compressed steel pipe 410 support material 400 has the effect of making the safe gulto work by minimizing the behavior of the continuous underground wall 100 generated during the pitwork.

Hereinafter, the present invention will be described in more detail with reference to Examples.

19 is an elevation view showing a state of joining the underground continuous wall and the compressed steel pipe with steel frame according to the present invention, Figure 20 is a plan view showing a state of joining the underground continuous wall and the compressed steel pipe according to the present invention with steel frame, 21 is a cross-sectional view showing a state where the underground continuous wall and the compressed steel pipe are bonded with steel frame according to the present invention.

As shown in these drawings, the underground continuous wall mud structure using the compressed steel pipe according to the present invention includes an underground continuous wall (100) integrally formed with a predetermined thickness and depth along the boundary line of the target ground (G); A plurality of fixing units 200 and 300 installed on the base continuous wall 100 through a plurality of anchor bolts 250 and 350; At the same time the weld is installed across the fixing unit (200, 300) and composed of the support member 400 made of a compressed steel pipe 410, it turns out that the basic example and the technical idea of the present invention is the same.

However, the fixing unit 300 and the steel frame member 310 is installed fixed along the surface of the underground continuous wall 100; A connecting member 330 welded to the surface of the steel member 310; The welding member is installed on the surface of the connecting member 330, and has a predetermined thickness and width, and includes a plate 320 having a circular hole 322 formed therein.

It will be described with respect to the construction of the underground continuous wall mud using the compressed steel pipe according to the present invention having the configuration as described above made of the configuration as described above.

Underground continuous wall mud pit excavation method using a compressed steel pipe according to the present invention comprises the steps of installing the guide wall (GW) along the boundary surface of the target ground (G); Forming an excavation hole (H) by digging an inner side of the guide wall (GW) to a predetermined depth by using an excavation equipment; Stabilizing the inside of the excavation hole (H) with a stabilizer (III); Inserting reinforcing bar assembly S into the excavation hole H using a lifting device (IV); After inserting the tremi tube (T) into the excavation hole (H) into which the reinforcing bar assembly (S) is inserted, while pouring the tremi tube (T) upward from the bottom of the excavation hole (H), the concrete continuous wall Forming (100) (V); In the underground continuous wall mud excavation method comprising the step (VI) of forming the capping portion (C) by installing the H beam (B) on the upper end of the underground continuous wall (100),

(Ⅶ) fixing a plurality of fixing units (200, 300) to the underground continuous wall (100); It consists of the same steps as the basic example of the present invention in that it consists of a step (고정) of fixing the support member 400 made of the compressed steel pipe 410 across the fixing unit (200, 300).

However, in the installation step (Ⅶ) of the fixing unit 300 has a predetermined thickness and width on the surface of the steel frame member 310 along the surface of the continuous wall 100, the plate is formed with a circular hole 322 in the center The steel frame 320 is welded and the connecting member 330 is welded on the surface of the plate 320, and then the steel frame 310 is fixed to the underground continuous wall 100 by anchor bolts 350 to be installed. Construct in the way.

As described above, the underground continuous wall retaining structure and the excavation method using the compressed steel pipe according to the present invention has the following effects.

First, the present invention has an advantage in that the permissible compressive force per compressed steel pipe support member is greatly increased, so that a wider horizontal and vertical arrangement interval can be maintained than the installation interval of H beam type, which is a general temporary support member.

Secondly, the present invention is economically advantageous because the number of steel pipe retainers is significantly reduced as a separate post-file installation is unnecessary for the takeover of the compressed steel pipe retainers.

Third, the present invention has the advantage that can significantly shorten the overall period of the excavation work by reducing the amount of installation and installation step of the compressed steel pipe support material during the excavation work.

Fourth, the present invention exhibits the pre-stressing force of the compressed steel pipe, the compression steel pipe of about 300ton or more acts on the underground continuous wall before the additional pit excavation work to reduce or minimize the base strain and subsequent deformation of the underground continuous wall There is a more stable advantage of suppressing the settlement effect on the surrounding structures and adjacent roads that the gulting work is made.

Claims (7)

An underground continuous wall (100) integrally formed with a predetermined thickness and depth along a boundary line of the target ground (G); A plurality of fixing units 200 and 300 installed on the base continuous wall 100 through a plurality of anchor bolts 250 and 350; In the underground continuous wall mud structure using a compressed steel pipe consisting of a support material 400 made of a welded steel pipe 410 and installed at the same time across the fixing unit (200, 300), The fixing unit 200 is a reinforced concrete block (210) formed by placing the cured concrete 214 in a cross-sectional shape having a predetermined thickness and width at the same time the reinforcing bar 212 is embedded therein; A connection part 220 fixedly installed on the reinforced concrete block 210 and having brackets 222 formed at both sides thereof; A flat jack 230 disposed on a surface of the connection part 220 and exerting a predetermined pressure; Underground continuous wall mud structure using a compressed steel pipe, characterized in that consisting of a plate 240 is welded on the flat jack 230. delete The method of claim 1, The fixing unit 300 is a steel frame member 310 is fixed along the surface of the continuous underground wall 100; A connecting member 330 welded to the surface of the steel member 310; The underground continuous wall mud structure using a compressed steel pipe, which is welded to the surface of the connecting member 330 and has a predetermined thickness and width and is formed of a plate 320 having a circular hole 322 formed in the center thereof. Installing the guide wall GW along the boundary surface of the target ground G; Forming an excavation hole (H) by digging an inner side of the guide wall (GW) to a predetermined depth by using an excavation equipment; Stabilizing the inside of the excavation hole (H) with a stabilizer (III); Inserting reinforcing bar assembly S into the excavation hole H using a lifting device (IV); After inserting the tremi tube (T) into the excavation hole (H) into which the reinforcing bar assembly (S) is inserted, while pouring the tremi tube (T) upward from the bottom of the excavation hole (H), the concrete continuous wall Forming (100) (V); In the underground continuous wall mud excavation method comprising the step (VI) of forming the capping portion (C) by installing the H beam (B) on the upper end of the underground continuous wall (100), (Ⅶ) fixing a plurality of fixing units (200, 300) to the underground continuous wall (100); Comprising the step (지) of fixing the support member 400 made of the compressed steel pipe 410 across the fixing unit (200, 300), The fixing unit 200 is installed (Ⅶ) both sides on the upper surface of the reinforced concrete block 210 is formed by the concrete 214 is cast and cured in a cross-sectional shape having a predetermined thickness and width at the same time as the reinforcing bar 212 is embedded therein A connecting portion 220 having a bracket 222 formed thereon, and a flat jack 230 exerting a predetermined pressure on a surface of the connecting portion 220, and a plate 240 on the flat jack 230. After welding, the underground concrete wall oyster excavation method using a compressed steel pipe, characterized in that the reinforced concrete block 210 is fixed to the underground continuous wall 100 by anchor bolts 250. delete The method of claim 4, wherein In the installation step (Ⅷ) of the support material 400, the compressed steel pipe 410 is welded to the plate 240 of the fixing unit 200, and the compressed steel pipe is increased by increasing the pressure in the flat jack 230 of the fixing unit 200. While supporting (310), underground continuous wall mud excavation method using a compressed steel pipe, characterized in that the fixed installation without the need for a separate support beam or post pile (Post Pile). delete

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