KR19990079687A - Improved top-down method using soil wall - Google Patents

Abstract

In the present invention, the ground slab is integrated with the retaining wall during the construction of the underground structure, while the permanent outer wall is placed separately from the retaining wall, thereby improving the construction of the underground structure of the building as a sturdy structure. The technical construction features of the present invention are the top-down method, the ground structure (20) construction on the ground by the upper end of the support pillars (1) and the support pillars (2) settled in the ground within the basement construction area At the same time, under the boundary of the underground structure 20 to proceed to the overall construction work to proceed quickly, the underground structure 20 is exposed to the pit after each floor from the ground surface Brackets (1) of the exposed barrier wall (3), while installing the earth wall (3) by sandwiching the earth plate (4) between the support columns (1) The base slab 21 is installed to the basement ground floor A by back-casting so that the support pillars 2 and the support columns 2 are integrally connected, and the top portion is separated from the basement wall A from the base wall 3 in cross section. Permanent outer wall 22 to the stratum slab 21 is to be placed in order to be constructed.

Description

Improved top-down method using soil wall

The present invention relates to a top-down method that simultaneously performs underground and ground structural works during building construction. Particularly, when building underground structures, each stratified slab is integrated with a retaining wall, while the permanent outer wall and The present invention relates to an improved top-down method using a retaining wall to separate and place the underground structure of a building as a secure structure.

In the past, a variety of building construction methods have been mainly adopted, and the building construction using such a building construction method has been carried out by installing a pile of piles in the ground along the planned excavation line of the area. By repeating the process of sandwiching the earth plate between the exposed piles, the earth wall was installed to the foundation floor, and the ground structure was poured sequentially from the crushed foundation floor in the earth wall together with the outer wall to construct the main structure. .

This is because the installation of the detachable retaining wall and the main structure work are performed separately when constructing the underground structure part of the building, and thus, there is no need for special equipment or technical skills, and the construction is easy and the required construction cost is relatively low. It has been widely used in various construction sites.

However, the construction work using the detachable earthquake method was weak in constructing a large underground structure where the excavation scale and the depth of excavation were increased because the earth pressure applied to the surrounding earth pressure acted during the construction was the first. Second, there was a problem that the perfect structure outside the retaining wall was virtually impossible in the city center where the buildings were concentrated, which caused the deterioration of the surrounding buildings due to the deformation and settlement of the ground. The third secured unnecessary working space between the retaining wall and the basement outer wall. There was a problem that the volume ratio of the underground structure part was reduced, and after the completion of the installation of the retaining wall, the construction period was extended as the main structure work was completed.

In order to solve the above problems, various types of TOP DOWN methods are actively used at the construction site, and one of them is the composite columns and supports settled by entering the ground in the basement construction area. With the upper part of the pillars as the boundary, the ground structure part construction proceeds to the upper part of the ground, and the underground structure part construction proceeds to the lower part of the ground so that the overall construction work can be proceeded quickly. Using the earth wall to fix the deck plate on the exposed composite pillar back to install the earth wall, and construct the main structure by inverting the stratum slabs together with the synthetic wall to the foundation floor so as to be integrated with the earth wall. Down method is known.

In the top-down method using the retaining wall, as shown in FIGS. 1A and 1B, when the basement structure 100 is constructed, the retaining wall 110 and the ground slab 120 are inversely integrated in the cross section. By constructing to form the main structure, in parallel with the installation work of the retaining wall 110, the composite wall 120 and the stratum slab 130 are placed, thereby shortening the construction period and being integral with the retaining wall 110 in cross section. It is true that the composite wall 120 has the advantage of being able to construct an underground structure as a rigid structure corresponding to the surrounding earth pressure.

However, according to the conventional top-down method using the retaining wall, the composite pillar 140 subjected to the excessive vertical load due to the self-weight of the composite wall 120 and the stratum slab 130 is buckled or settled and is under construction. There was a possibility that a collapse accident occurred. Second, as the composite pillar 140 is embedded in the cross section of the composite wall 120, the buried reinforcing bars 121 which are disposed on the composite wall 120 cannot be connected to each other integrally. There is a problem that the main structure is structurally weak due to the reinforcement as a short-circuit state between the 140), and in order to install the deck plate 150 on the back of the third composite pillar 140, the composite pillar 140 itself fixed in the ground is completely contained. As a result of the excavation work, the amount of excavation work is increased. In the case of poor verticalness of the composite pillars 140 settled in the fourth underground, there was a problem that the underground space was narrowed by invading into the predetermined design area to maintain the verticality of the composite wall 120 itself. .

According to the present invention, each stratified slab is inverted so as to be integral with the retaining wall, and then the permanent outer wall is placed sequentially from the foundation floor so as to be separated from the retaining wall in cross section, thereby minimizing the load acting on the support column during the construction of the first underground structure. It improves the stability of building construction by efficiently responding to the working earth pressure. Second, it makes the underground structure part as a more rigid structure by allowing the reinforcing bars to be connected without being short-circuited in the permanent wall. The objective is to provide an improved top-down method using a retaining wall that enables the construction of underground structures to be designed for design purposes without regard to the verticality of the support columns.

Figure 1a is a longitudinal cross-sectional view of the main portion of the conventional embodiment

Figure 1b is a cross-sectional view of the excerpts of the conventional embodiment

Figure 2 illustrates the process of installing the support columns and support columns in the ground

Figure 3 illustrates the process of undertaking the construction of ground and underground structures

Figure 4 illustrates the stratum slab reverse casting process

Figure 5 shows the underground structure of the construction is completed by placing the permanent outer wall in sequence

being

Figure 6a is a partial perspective view showing the support column

Figure 6b is a cross sectional view of the support column

Figure 7a is a longitudinal sectional view of the excerpts of the embodiment of the present invention

Figure 7b is a cross-sectional view of the main portion of the excerpt embodiment of the present invention

Figure 8 shows an embodiment of the present invention

Figure 9 shows another embodiment of the present invention

Explanation of symbols on the main parts of the drawings

1: support column 1a: stud 2: support column

3: retaining wall 4: earth plate 5: reinforced concrete support pillar

6: temporary support 7: auxiliary column 8: cement column

10: ground structure unit 11: interlayer slab 20: underground structure unit

21: Stratified slab 22: Permanent outer wall 23: Soil cement wall

In the present invention, the construction of the ground structure part 20 is carried out on the ground with the upper end portions of the support pillars 1 and the support pillars 2 settled in the ground in the basement construction area. The technical concept is the same as the conventional one in that the construction of the underground structural unit 20 can be quickly performed for the overall construction work.

However, in the improved top-down method using the soil wall of the present invention, as shown in Figs. 2 and 5, the underground structure portion 20 is the earth plate between the support pillars (1) exposed to the pit after each layer from the ground surface (4) Inserting and installing the retaining wall (3), while backing the cast pillars (1) and the support columns (2) of the exposed retaining wall (3) to be integrally connected to each other to the basement base floor (A) The technical features of the construction of the ground slab 21 is installed by sequentially placing the permanent outer wall 22 from the basement ground floor A to the top ground slab 21 so as to be separated in cross section from the earth wall 3. It is done.

In other words, the present invention, after the construction of each underground slab 21 is integrated with the retaining wall (3) at the time of construction of the underground structure 20, after pre-installation to the foundation floor (A), from the foundation floor (A) By placing the permanent outer wall 22 sequentially so as to be separated in cross section from the soil wall 3, and constructing the main structure, first, the earth pressure of the surroundings acted during the construction of the underground structure 20 is supported by the support column of the soil wall 3 (1). ) Is supported as stratified slabs 21 which are inversely cast so as to be integral with one another, and the support pillars 1 stably prevent the buckling or sinking by bearing only vertical loads due to the stratified slabs 21 themselves. As the permanent outer wall 22 is constructed to be separated from the second retaining wall 3, the embedded reinforcing bars 21a are connected to each other as a unitary body without short-circuit. More dog It is possible to construct the underground structure part 20 as a high-level structure, and as long as the permanent outer wall 22 is installed to be separated from the third retaining wall 3 in cross-section, the presence of pre-installed support columns 1 is poor. It will have the advantage of being able to secure a predetermined design area.

Hereinafter, the top-down method using the earth retaining wall of the present invention in more detail as follows.

First, as shown in FIG. 2, the prepared support pillars 1 and the support pillars 2 are mounted in the ground in the basement construction area.

The support column 1 is installed in the ground by driving at a predetermined interval along the predetermined plan line of the basement construction zone, and the support columns 2 are installed in the inner ground where the support columns 1 are installed. At this time, the support pillars 2 are fixed and installed so as to be integrally supported by the reinforced concrete support pillars 5 that are pre-poured on the base bottom of the position to be installed.

The support columns 1 are made of H-shaped steel as shown in FIGS. 6A and 6B, and the plurality of studs 1a are welded and fixed in one set at each position to which the strata slabs 21 are connected inside the support columns 1. Settled underground.

Here, by installing the soil cement wall 23 as the required depth in the ground around the outer periphery where the support columns (1) are installed, the soft ground close to the ground is stabilized by the soil cement wall (23), the support pillar ( 1) When performing underground excavation work, the cutting surface of soft ground should be prevented from collapse.

When the installation work of the support column (1) and the support column (2) is completed, as shown in Figure 3, the upper end of the support column (1) and the support column (2) to the upper surface of the support column (1) ) And the support pillar (2) to start the construction of the ground structure part 10 in order to place the interlayer slab (11) of the ground in sequence, at this time, the underground structure part (20) to reverse the ground layer slab 21 to the lower ground ) Will start construction.

4 is a work process of the first stage to perform the construction of the underground structure 20, the brace pillar (1) and the support pillar (2) settled in the ground by performing the excavation work for each floor exposed, the exposed brace (1) sandwiching the earth plate (4) between the installation of the retaining wall (3), while placing the foundation slabs 21 to be integrated with the support pillar (1) and the support pillar (2) by repeating the foundation Reverse stratum slab 21 to the bottom (A).

When performing the pitwork work for placing the stratum slab 21, by determining in advance whether or not to install the support ball according to the geological structure of the stratum, or whether to install the formwork panel after stopping the pit surface smoothly, As the required depth, the gulting work is performed.

In addition, when performing the excavation work as described above, the support pillars 2 are completely exposed, and the support pillars 1 can be provided with the earth plate 4 between the support pillars 1, so that only a part of the front surface thereof can be installed. By cutting this exposed, it is desirable to be considerate so that the support pillars 1 can be firmly fixed in the ground during construction.

As shown in FIG. 7A, the stratified slabs 21 are placed so that the studs 1a, which are installed in one piece at a predetermined interval in the longitudinal direction inside the support pillars 1, are embedded in the cross section. Thus, the ground slabs 21 are constructed so that they are supported by the support column 1 through the studs 1a.

At this time, the stratified slab 21 serves as a support for supporting the interior of the support pillars 1 during the construction of the underground structure 20, so that the periphery acting on the retaining wall 3 including the support pillars 1. Will effectively respond to the earth pressure. At the same time, the support columns (1) are to bear only the load acting by the weight of the stratified slabs 21 to prevent the support columns (1) from buckling or sinking during the construction of the underground structure (20).

5 is a work process for installing the permanent outer wall 22 during the construction of the underground structure 20, and after installing the stratified slabs 21 up to the basement base A, the earthen wall 3 from the basement base A is shown. ) And the periphery of the outermost layer 22 to the uppermost stratum slab 21 while connecting to each tooth slab 21 so as to be separated in cross section.

At this time, as shown in Figure 7a and 7b, the permanent outer wall 22 is poured in the form of a haptic wall which is separated in cross-section with the earth wall 3 and simply contacted, so that the buried reinforcing bars are not short-circuited by each other. As a unitary body is connected to have a solid structural strength, as well as to secure a predetermined design surface regardless of the verticality of the support column (1).

On the other hand, Figure 8 shows an embodiment of the present invention, when performing the excavation work for the construction of the stratum slabs 21, the inclined upward connection from the exposed support pillar (2) toward the support column (1) By supporting it as a temporary brace 6 to be, it is to be able to firmly respond to the earth pressure around the actuation of the support pillars (1) during the construction of the stratum slab (21).

In addition, Figure 9 shows another embodiment of the present invention, wherein the retaining wall (3) is to settle the auxiliary pillar (7) in the ground between the support pillar (1) before performing the pit excavation work, the support It is to be made of a cement column (8) formed by jet grouting the cement mortar between the column (1) and the auxiliary column (7). The retaining wall 3 is a structure in which the support columns 1 are embedded in the cement column 8 so that the retaining columns 1 are firmly fixed in the ground without being exposed to the support columns 1 during the excavation. (3) The benefits of increasing structural rigidity can be expected.

As described above, the present invention inverts each stratum slab to be connected with the pre-installed retaining wall, and then installs the permanent outer wall in order to separate the retaining wall from the lower part of the stratum bottom. While performing, it is possible to obtain a more robust main structure and to have a useful effect such as securing a predetermined design area.

Claims (6)

The ground structure 20 is constructed on the ground with the upper ends of the support pillars 1 and the support pillars 2 settled in the ground in the basement construction area, and the underground structure 20 is located in the ground below the boundary. ) In proceeding with the construction so that the overall construction can proceed quickly, The underground structure portion 20 is inserted into the earth plate (4) between the support pillars (1) exposed to the ground after each layer from the ground surface, while installing the retaining wall (3), the support pillar of the exposed retaining wall (3) ( 1) install each stratified slab 21 to the basement ground floor A by back-casting so that the support columns 2 are integrally connected, and separate from the basement wall A from the base wall 3 in cross section. Improved top-down method using a retaining wall, characterized in that the construction by placing the permanent outer wall 22 sequentially up to the top floor slab 21 as possible. The improved top-down method according to claim 1, wherein a soil cement wall (23) is provided as a required depth in the ground around the outer periphery where the support columns (1) are installed. The method according to claim 1, wherein the support pillars (2) are completely exposed when performing the excavation, and the support columns (1) are such that the earth plate (4) can be installed between the support columns (1) An improved top-down method using a retaining wall, which is cut to expose only a part of the front surface, so that the support pillars 1 can be firmly fixed in the ground during construction. The method according to claim 1, wherein when performing the excavation work for the construction of the stratum slabs (21), it is supported as a temporary support (6) connected inclined upward toward the support column (1) from the exposed support column (2) Improved top-down method using a retaining wall characterized in that. According to claim 1, The stratified slabs (21) are placed in the cross-section so that the studs (1a), each of which is installed in one set at a certain length in the longitudinal direction of the inner side of the support pillars (1) are embedded as a single piece , Improved top-down method using a retaining wall, characterized in that the ground slabs 21 are constructed so as to be connected to the support pillar (1) through the studs (1a). According to claim 1, wherein the retaining wall (3) is fixed to the support pillar (7) in the ground between the support pillar (1) before performing the excavation work, the support pillar (1) and the auxiliary pillar (7) Improved top-down method using a retaining wall, characterized in that the cement pillar (8) formed by jet grouting the cement mortar.