KR102504211B1 - Improvement down-up method of construction of the underground structure - Google Patents

Abstract

The present invention discloses an improved down-up method of construction for an underground structure, wherein in a down-up method for constructing a slab of an underground structure, the construction of a basement-floor slab of an underground structure is facilitated by stepwise lowering a truss support, which supports the basement-floor slab by pouring concrete and consists of a column upper bracket, a lower chord and an upper chord, the separation of the poured basement-floor slab from a mold is facilitated and the operation of raising and lowering the truss support, which consists of a column upper bracket, a lower chord and an upper chord, can be finely adjusted by hydraulic pressure to improve workability greatly, the operation of lowering the truss support is performed by hydraulic pressure to facilitate the lowering operation, the truss support can be fixed firmly and supported on a vertical beam to firmly bear load caused by pouring concrete, the truss support consisting of a column upper bracket, a lower chord and an upper chord can be supported firmly on a wall beam and the truss support can be separated easily from the wall beam to improve the convenience of work and firmness greatly, thereby firmly bearing the load of poured concrete, and the truss support can be supported in a dual structure by a hydraulic jack and a reinforcing hydraulic jack, thereby more firmly supporting the truss support when the truss support is lowered as well as when concrete is poured.

Description

Improvement down-up method of construction of the underground structure}

The present invention relates to an improved down-up construction method for underground structures, and more particularly, to facilitate the lifting and lowering of a truss support by using an automatic hydraulic jack device, thereby facilitating the separation and placement of formwork and slabs, and truss The present invention relates to an improved down-up construction method of an underground structure capable of greatly improving the rigidity and supportability of a support body and enabling fine adjustment of a jack device by hydraulic pressure.

In general, the cut-and-cut earth retaining method has been mainly adopted for various building constructions. In the case of building construction using this cut-and-cut earth retaining method, after installing thumb piles in the ground along the planned excavation planning line of the area, excavation work is performed while By repeating the installation process by inserting the earth plate between the exposed thumb piles, the retaining wall was installed to the foundation floor, and each stratum slab was sequentially poured together with the outer wall from the excavated foundation floor in the retaining wall to construct this structure. .

Building construction using such an open-cut earth retaining method has, first, a vulnerability in constructing a large-scale underground structure in which the excavation scale or excavation depth increases as the earth retaining wall bears the surrounding earth pressure acting during construction, and second In downtown areas where buildings are dense, it is virtually impossible to completely compact the outside of the retaining wall, causing damage to surrounding buildings due to deformation and settlement of the ground floor. There was a problem that the floor area ratio of was reduced, and there was a problem that the construction period was extended as much as the construction of the main structure was carried out only after the fourth retaining wall installation work was completed.

In addition, in order to solve the problems of the conventional open-cut retaining wall construction method, various types of top-down construction methods are actively used at building construction sites.

The top-down construction method is a construction method that forms an underground structure by going down from the ground to the basement in order to minimize the impact on the surroundings in densely populated areas such as downtown construction. After curing after pouring concrete, when the curing of the upper slab beam is finished, the formwork is demolded from the upper slab beam and lowered while maintaining the shape to construct the underground structure.

At this time, the lowered formwork is being reused to form the lower slab beam, and accordingly, the down-up method constructs an underground structure while repeatedly lowering the formwork for the slab beam.

Looking at the prior art, a top-down construction method using a central steel column, registered patent No. 10-2123543, has been devised. A retaining wall construction step of performing a retaining wall construction step, a pillar construction step of vertically driving a steel pillar from the ground into an internal space surrounded by a retaining wall, and excavating the inside of the retaining wall to a predetermined depth to perform excavation work, and perform excavation work. It consists of a wale installation step of installing a wale horizontally on the side of the retaining wall exposed by the wall, and a horizontal beam installation step of installing a horizontal beam connecting the facing wale and the steel pillars between them. Installation steps are repeated, and walls, floors and foundations are constructed according to the design in the interior space.

In addition, a top-down method using a truss-type support has been proposed, and for example, a top-down method of forming an underground structure using a truss-type support, disclosed in Patent Publication No. 10-2020-0032316, has been devised.

In this prior art, in the top-down method of forming an underground structure, installing a column member on the ground, coupling a bracket member to the column member, installing a truss-type support in the transverse direction on top of the bracket member It consists of the steps of:

However, in the case of the prior art, in the process of connecting and constructing a plurality of truss-type supports to bracket members connected to column members, bracket members are connected by welding or bolting, or truss-type supports are connected by welding or bolting. Since the member, the column member and the truss-type support are completely fixed, there is a problem in that the entire column must be reconstructed if the level or distance does not match in the process of connecting and constructing the column member and the column member.

In addition, as the bracket member connected to the column member and the truss-type support connected to the bracket member are connected only by welding or bolts, there is a problem in that it is insufficient to firmly support the load strength of the concrete to be poured.

Patent Document 1: Korean Registered Patent No. 10-2123543 (registered on June 10, 2020) Patent Document 2: Korean Patent Publication No. 10-2020-0032316 (published on March 26, 2020)

The present invention can firmly support the truss support when constructing basement slabs by pouring concrete on the formwork supported by the truss support, and also enables fine adjustment when the truss support is lowered. It provides an improved down-up construction method for underground structures that can be firmly supported, and can greatly improve work convenience according to the descending operation of the truss support by facilitating separation and separation work between the cast basement slab and formwork. There is a purpose.

As a means for achieving the above object, the improved down-up construction method of the underground structure of the present invention, after excavating the ground on which the underground structure is to be constructed, installs a wall beam, installs a vertical beam inside the wall beam, and then vertically In the underground structure down-up construction method for constructing an underground structure by installing a truss support on a beam, a first wall stopper is installed on a side pile, a column upper stopper and a lower column stopper are installed on a post pile, respectively, and A first step of installing a post lower bracket on the upper side; After the first process, the first hinge connection piece and the second hinge connection piece are installed on the post pile lower bracket, the post pile upper bracket having a vertical support caster box is installed at the lower end of the post pile, and then the post pile lower part The lower end of the vertical support hydraulic jack is hinged to the first hinge connection piece of the bracket, the upper end of the vertical support hydraulic jack is connected to the vertical support caster box, and the lower end of the auxiliary hydraulic jack is hinged to the second hinge connection piece and the top of the auxiliary hydraulic jack is connected. A second step of connecting the hinge to the auxiliary hinge piece of the vertical support hydraulic jack; After the second process, the lower chord is bolted and installed on the upper surface of the upper bracket of the column, and the upper chord having a horizontal support plate on the lower surface is bolted and installed on the upper surface of the lower chord, and the lower chord and the upper chord cross each other. It is installed to cross, and a horizontal support hydraulic jack is installed on the side pile, but the lower end of the horizontal support hydraulic jack is connected to the first wall stopper, and the horizontal support cylinder rod of the horizontal support hydraulic jack is hinged to the horizontal support plate. 3 process; After the third process, the formwork is seated and fixed on the upper surface of the upper chord, and then the formwork is poured and dried to construct the first basement floor slab.

In addition, after the fourth process, the column lower stopper installed on the post pile is removed, and the removed column lower stopper is lowered and installed on the lower side in the vertical longitudinal direction of the post pile, and is positioned at the lower side of the horizontal support hydraulic jack. A fifth step of excavating the lower side of the post bracket after installing the two-wall stopper; After the fifth process, the lower column bracket is lowered to the side of the lower column stopper installed in the post pile, and the vertical support cylinder rod of the vertical support hydraulic jack is pulled from the vertical support hydraulic jack. A sixth step of lowering; After the sixth process, the lower end of the horizontal support hydraulic jack whose lower end is hinged to the first wall stopper is separated from the first wall stopper, and the horizontal support cylinder rod of the horizontal support hydraulic jack is tensioned. A seventh step of connecting the hinge to the two-wall stopper; After the 7th process, the column top stopper installed on the post pile is removed, lowered in the vertical length direction of the post pile and reinstalled, and the vertical support cylinder rod of the vertical support hydraulic jack and the horizontal support cylinder rod of the horizontal support hydraulic jack are respectively vertically supported. An eighth process of lowering the hydraulic jack and the horizontal support hydraulic jack to prepare the lower chord and upper chord by demolding 0.1 cm to 0.3 cm from the first basement slab to prepare for lowering; After the eighth process, the vertical support cylinder rod is drawn into the vertical support hydraulic jack side and the horizontal support cylinder rod is drawn into the horizontal support hydraulic jack side to lower the upper chord, lower chord, and column upper bracket, and the column upper bracket is moved by the seventh step. A ninth process of descending to the lower side of the post pile and lowering to be located on the re-installed column top stopper; After the ninth step, the lower ground of the column lower bracket is excavated so that the second basement layer slab is installed on the lower side of the first basement layer slab, and the upper chord, lower chord, and column upper bracket are excavated by repeating the ninth step. A 10th process of lowering the basement slab to the construction position; After the 10th step, a 11th step of constructing a second basement floor slab by placing and fixing a formwork on the upper surface of the upper chord, then pouring and drying concrete on the formwork; After the 11th step, the 5th to 10th steps are repeated to construct the basement slab continuously to construct the underground structure.

The present invention relates to a down-up method for constructing slabs of underground structures by stepwise lowering of a truss support composed of a column upper bracket supporting a basement slab and a lower chord and an upper chord by concrete pouring, It is easy to construct basement slabs, and it is easy to separate the cast basement slabs from the formwork, as well as to fine-tune the lifting and lowering motions of the truss support consisting of the column upper bracket, lower chord, and upper chord by hydraulic pressure. Workability can be greatly improved, and since the operation of lowering the truss support is performed by hydraulic pressure, the lowering operation is easy, and the truss support can be firmly fixed and supported on the vertical beam to firmly support the load intensity due to concrete pouring. In addition, it can firmly support the truss support consisting of the upper column bracket and the lower chord and upper chord on the wall beam, and the truss support can be easily separated from the wall beam, greatly improving work convenience as well as robustness. Since the truss support can be supported in a double structure by a hydraulic jack and a reinforcing hydraulic jack, the truss support can be more firmly supported when the truss support is lowered as well as concrete pouring. there is.

1 is a process chart showing the process of the improved down-up construction method of the present invention underground structure.
Figure 2 is a construction diagram showing the first step of the improved down-up construction method of the present invention underground structure.
3 is a construction diagram showing the second step of the improved down-up construction method of the underground structure of the present invention.
4 is a construction diagram showing the third step of the improved down-up construction method of the underground structure of the present invention.
5 is a construction diagram showing a fourth step of the improved down-up construction method of an underground structure according to the present invention.
6 is a construction diagram showing a fifth step of the improved down-up construction method of an underground structure according to the present invention.
7 is a construction diagram showing the sixth step of the improved down-up construction method of the underground structure of the present invention.
8 is a construction diagram showing the seventh step of the improved down-up construction method of the underground structure of the present invention.
9 is a construction diagram showing the eighth step of the improved down-up construction method of the underground structure of the present invention.
10 is a construction diagram showing the ninth step of the improved down-up construction method of the underground structure of the present invention.
11 is a construction diagram showing the tenth step of the improved down-up construction method of the underground structure of the present invention.
12 is a construction diagram showing the continuous process of the 10th process of the improved down-up construction method of the underground structure of the present invention.
13 is a construction diagram showing an 11th step of the improved down-up construction method of an underground structure according to the present invention.

Hereinafter, other objects and features of the present invention in addition to the above objects will be clearly revealed through the description of the embodiments with reference to the accompanying drawings.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, an improved down-up construction method of an underground structure according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

As shown, the present invention, after excavating the ground on which an underground structure is to be constructed, installs a wall beam, installs a vertical beam inside the wall beam, and then installs a truss support on the vertical beam to construct the underground structure. It relates to an underground structure down-up construction method, and is performed by the first step (S1) to the eleventh step (S11).

In the first step (S1) of the present invention, the first wall stopper 10 is installed on the side pile (H1), and the post pile (H2) is installed with the upper column stopper 20 and the lower column stopper 30, respectively. It is a process of installing the pillar lower bracket 50 on the upper side of the pillar lower stopper 30.

The first wall stopper 10 is fixed by bolting to the side pile H1, which is used to lift or lower the upper column bracket 40 and the lower column bracket 50, the upper column bracket 40 When the lower chord 42 fixed by bolting to the upper surface of the lower chord 42 and the upper chord 80 bolted to the top of the lower chord 42 are raised or lowered, the horizontal support hydraulic jack 90 connected to the first wall stopper 10 in order not to be interfered with by

In the second process (S2) of the present invention, after the first process (S1), the first hinge connection piece 51 and the second hinge connection piece 52 are installed on the pillar lower bracket 50 installed on the post pile H2. And, after installing the column upper bracket 40 equipped with the vertical support caster box 41 at the lower end of the post pile (H2), and then vertically supporting the first hinge connection piece 51 of the column lower bracket 50 The lower end of the hydraulic jack 60 is hinged, the upper end of the vertical support hydraulic jack 60 is connected to the vertical support caster box 41, and the lower end of the auxiliary hydraulic jack 70 is hinged to the second hinge connection piece 52 It is a process of connecting the upper end of the auxiliary hydraulic jack 70 to the auxiliary hinge piece 61 of the vertical support hydraulic jack 60.

When connecting the vertical support caster box 41 and the first hinge connection piece 51 with the vertical hydraulic support jack 60, after connecting the vertical support roll guide 62 to the top of the vertical hydraulic support jack 60 The vertical support roll guide 62 is positioned inside the vertical support caster box 41, so that when the vertical support cylinder rod 60a of the vertical hydraulic support jack 60 moves in and out, the vertical support caster Along the inner longitudinal direction of the box 41, the vertical support cloud guide 62 is connected to guide while sliding.

The upper column bracket 40 is supported by the upper column stopper 20, the upper column stopper 20 is bolted to the post pile H2, and the lower column bracket 50 is the column Being supported and supported by the lower stopper 30, the pillar lower stopper 30 is also bolted to the post pile H2.

The reason why the upper column stopper 20 and the lower column stopper 30 are respectively bolted to the post pile H2 is to raise or lower the upper column bracket 40 or to lower the column lower bracket 50. This is to make it easy to separate or fix the pillar top stopper 20 and the pillar bottom stopper 30 to the post pile H2 when moving up or down.

In the third process (S3) of the present invention, after the second process (S2), the lower chord 42 is installed by bolting to the upper surface of the column top bracket 40, and the horizontal support plate 81 is provided on the lower surface. The upper chord 80 is installed by bolting to the upper surface of the lower chord 42, but the lower chord 42 and the upper chord 80 are installed so that they cross each other, and the side pile H1 is horizontally supported. Install a hydraulic jack (90) by connecting the lower end of the horizontal support hydraulic jack (90) to the first wall stopper (10), and install the horizontal support cylinder rod (90a) of the horizontal support hydraulic jack (90) on the horizontal support plate (81). It is a process of installing by hinge connection.

When connecting the upper end of the horizontal support hydraulic jack 90 to the horizontal support plate 81 in the fourth step (S4), the horizontal support cylinder rod 90a of the horizontal support hydraulic jack 90 is attached to the horizontal support plate 81. According to the hinge connection, when the horizontal support cylinder rod 90a of the horizontal support hydraulic jack 90 is tensioned, the horizontal support cylinder rod 90a can be hinged with respect to the horizontal support plate 81, so that the phase current 80 ) greatly improves the supportability according to the descent of the

Moreover, since the vertical support roll guide 62 is sliding and moved inside the vertical support caster box 41 when the vertical support cylinder rod 60a is pulled from the vertical support hydraulic jack 60, the vertical support cylinder rod (60a) makes it easy to tension the vertical support hydraulic jack 60, as well as fine adjustment is possible.

In addition, when the vertical support cylinder rod 60a is tensioned, the vertical support hydraulic jack 60 can be easily tilted, so that the pillar lower bracket 50, the pillar upper bracket 40 and the lower chord ( 42) and fine adjustment of the lifting and lowering operation of the phase chord 80 is possible.

In the fourth process (S4) of the present invention, after the third process (S3), the formwork 101 is seated and fixed on the upper surface of the upper current 80, and then concrete is poured and dried on the formwork 101, and the first This is a process of constructing the basement slab 102.

The reason why the lower chord 42 and the upper chord 80 are cross-intersected with respect to each other is that, when concrete is poured after the formwork 101 is seated on the upper chord 80, the load of the concrete to be poured is solid. in order to support

In the fifth step (S5) of the present invention, after the fourth step (S4), the pillar lower stopper 30 installed on the post pile (H2) is removed, and the removed pillar lower stopper (30) is returned to the post pile (H2). ) is lowered and installed on the lower side in the vertical longitudinal direction, and the second wall stopper (10a) is installed to be located on the lower side of the horizontal support hydraulic jack 90, and then on the ground on the lower side of the column lower bracket 40 It is an excavation process.

In addition, in the sixth process (S6) of the present invention, after the fifth process (S5), the column lower bracket 50 is lowered to the side of the column lower stopper 30 installed in the post pile (H2), but the vertical support It is a process of lowering the pillar lower bracket 50 with respect to the pillar upper bracket 40 by an operation of tensioning the vertical support cylinder rod 60a of the hydraulic jack 60 from the vertical support hydraulic jack 60.

At this time, as the auxiliary hydraulic jack 70 is hinged to the vertical support hydraulic jack 60, the vertical support hydraulic jack 60 tilts when the vertical support cylinder rod 60a of the vertical support hydraulic jack 60 is pulled in. In addition to improving load support, the vertical support cylinder rod 60a can be smoothly and easily pulled into the vertical support hydraulic jack 60, so that the pillar upper bracket 40, the lower chord 42 and the upper chord ( 80) and the operation of raising or lowering the column lower bracket 50 relative to the vertical beam H2 can be finely adjusted.

In the seventh step (S7) of the present invention, after the sixth step (S6), the lower end of the horizontal support hydraulic jack 90 whose lower end is hinged to the first wall stopper 10 is separated from the first wall stopper 10 This is a process of tensioning the horizontal support cylinder rod 90a of the horizontal support hydraulic jack 90 and connecting the hinge to the second wall stopper 10a installed on the side pile H1 by the fourth step S4.

In addition, in the eighth step (S8) of the present invention, after the seventh step (S7), the pillar top stopper 20 installed on the post pile (H2) is separated and lowered in the vertical longitudinal direction of the post pile (H2) to Install, and lower the vertical support cylinder rod (60a) of the vertical support hydraulic jack (60) and the horizontal support cylinder rod (90a) of the horizontal support hydraulic jack (90) toward the vertical support hydraulic jack (60) and the horizontal support hydraulic jack (90) side, respectively. It is a process of preparing the lower chord 42 and the upper chord 80 by demolding 0.1 cm to 0.3 cm from the first basement slab 102 to prepare for lowering.

The reason why the lower chord 42 and the upper chord 80 lower the first basement layer slab 102 by 0.1 cm to 0.3 cm is that the upper chord 80 and the construction work when the column upper bracket 40 is lowered This is to ensure that it is easily spaced apart from the first basement floor slab 102.

In addition, in the ninth step (S9) of the present invention, after the eighth step (S8), the vertical support cylinder rod (60a) is drawn into the vertical support hydraulic jack 60 side and the horizontal support cylinder rod (90a) is moved to the horizontal support hydraulic jack ( 90) to lower the upper chord 80, the lower chord 42, and the upper column bracket 40, but the upper column bracket 40 moves to the lower part of the post pile H2 by the seventh step S7. It is a process of descending to the side to be positioned on the re-installed pillar top stopper 20.

At this time, the pillar upper bracket 40 is a post pile because the phase chord 80 is fixed by the horizontal support hydraulic jack 90 connected to the second wall stopper 10a fixed to the side pile H1. It is fixed without descending to the lower side of (H1).

In addition, in the 10th process (S10) of the present invention, after the 9th process (S9), the second basement slab 103 is installed on the lower side of the first basement slab 102 of the column lower bracket 50 It is a process of excavating the lower ground and repeating the ninth process (S9) to lower the top chord 80, the bottom chord 42, and the column upper bracket 40 to the construction position of the second basement slab 102 .

In addition, in the 11th process (S11) of the present invention, after the 10th process (S10), the formwork 101 is seated and fixed on the upper surface of the upper current 80, and then concrete is poured into the formwork 101 and dried. This is a process of constructing the second basement floor slab 103.

The present invention, by the operation of the vertical support hydraulic jack (60), that is, the vertical support cylinder rod (60a) of the vertical support hydraulic jack (60) is pulled into the vertical support hydraulic jack (60), the column top bracket (40) ) is raised or lowered with respect to the post pile (H2) to raise or lower the lower chord 42 and the upper chord 80, and the pillar lower bracket 50 is raised or lowered with respect to the post pile (H2)

In addition, after the vertical support cylinder rod 60a is pulled from the vertical support hydraulic jack 60 to lower the column lower bracket 50, the column lower bracket is attached to the column lower stopper 30 installed on the post pile H2. (50) is supported so that it is supported.

In this way, in the present invention, after the 11th step (S11), the 5th step (S5) to the 10th step (S10) are repeated to construct the basement slab continuously to construct the underground structure.

As described above, the present invention has been described by specific details such as specific components and limited embodiments and drawings, but these are provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. Those skilled in the art to which the present invention pertains can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments and should not be determined, and all things equivalent or equivalent to the claims as well as the following claims belong to the scope of the present invention.

S1: 1st process S2: 2nd process
S3: 3rd process S4: 4th process
S5: 5th process S6: 6th process
S7: 7th process S8: 8th process
S9: 9th process S10: 10th process
H1: wall beam H2: vertical beam
10: first wall stopper 10a: second wall stopper
20: pillar top stopper
30: pillar lower stopper 40: pillar upper bracket
41; Vertical support caster box 42: lower current
50: pillar lower bracket 51: first hinge connection piece
52: second hinge connection piece 60: vertical support hydraulic jack
60a: vertical support cylinder rod 61: auxiliary hinge piece
62: vertical support rolling guide 70: auxiliary hydraulic jack
80: phase current 81: horizontal support plate
90: horizontal support hydraulic jack 90a: horizontal support cylinder rod
92: horizontal support cloud guide 101: formwork
102: first basement floor slab 103: second basement floor slab

Claims (3)

In the underground structure down-up construction method of constructing an underground structure by excavating the ground on which an underground structure is to be constructed, installing a wall beam, installing a vertical beam inside the wall beam, and then installing a truss support on the vertical beam ,
Install the first wall stopper (10) on the side pile (H1), install the upper column stopper (20) and the lower column stopper (30) on the post pile (H2), respectively, on the upper side of the lower column stopper (30). A first step (S1) of installing the pillar lower bracket 50;
After the first step (S1), the first hinge connection piece 51 and the second hinge connection piece 52 are installed on the pillar lower bracket 50 installed on the post pile H2, and at the lower end of the post pile H2. After installing the column upper bracket 40 equipped with the vertical support caster box 41, the lower end of the vertical support hydraulic jack 60 is hinged to the first hinge connection piece 51 of the column lower bracket 50, and the The upper end of the vertical support hydraulic jack 60 is connected to the vertical support caster box 41, the lower end of the auxiliary hydraulic jack 70 is hinged to the second hinge connection piece 52, and the upper end of the auxiliary hydraulic jack 70 is connected to the vertical A second step (S2) of connecting the hinge to the auxiliary hinge piece 61 of the support hydraulic jack 60;
After the second step (S2), the lower chord 42 is fixed to the upper surface of the pillar upper bracket 40 by bolting and installed, and the upper chord 80 equipped with the horizontal support plate 81 is installed on the lower surface of the lower chord ( 42), but installed by bolting and fixing, the lower chord 42 and the upper chord 80 are installed so that they cross each other, and the horizontal support hydraulic jack 90 is installed on the side pile (H1), but the horizontal support hydraulic jack ( 90) is installed by connecting the lower end to the first wall stopper 10, and the horizontal support cylinder rod 90a of the horizontal support hydraulic jack 90 is hinged to the horizontal support plate 81. Third process (S3) );
After the third step (S3), the formwork 101 is seated and fixed on the upper surface of the upper current 80, and then the formwork 101 is poured and dried to construct the first basement floor slab 102. (S4);
After the fourth process (S4), the post pile (H2) is installed by removing the lower column stopper (30), and the removed column lower stopper (30) is lowered to the lower side of the post pile (H2) in the vertical longitudinal direction. And, a fifth step (S5) of installing the second wall stopper (10a) to be located on the lower side of the horizontal support hydraulic jack (90), and then excavating the ground on the lower side of the pillar lower bracket (50);
After the fifth process (S5), the lower column bracket 50 is lowered toward the lower column stopper 30 installed in the post pile H2, and the vertical support cylinder rod 60a of the vertical support hydraulic jack 60 is lowered. A sixth step (S6) of lowering the pillar lower bracket 50 with respect to the pillar upper bracket 40 by a tensioning operation from the vertical support hydraulic jack 60;
After the sixth step (S6), the lower end of the horizontal support hydraulic jack 90 whose lower end is hinged to the first wall stopper 10 is separated from the first wall stopper 10, and the horizontal support cylinder of the horizontal support hydraulic jack 90 A seventh step (S7) of tensioning the rod (90a) and hinge-connecting it to the second wall stopper (10a) installed on the side pile (H1) by the fourth step (S4);
After the seventh process (S7), the column top stopper 20 installed on the post pile (H2) is separated and lowered in the vertical length direction of the post pile (H2) and reinstalled, and the vertical support hydraulic jack (60) The lower chord 42 and the upper chord 80 are lowered to the vertical support hydraulic jack 60 and the horizontal support hydraulic jack 90 by lowering the support cylinder rod 60a and the horizontal support cylinder rod 90a of the horizontal support hydraulic jack 90, respectively. ) An eighth step (S8) of preparing for lowering by demolding 0.1 cm to 0.3 cm from the first basement slab 102;
After the eighth process (S8), the vertical support cylinder rod (60a) is drawn into the vertical support hydraulic jack (60) side and the horizontal support cylinder rod (90a) is drawn into the horizontal support hydraulic jack (90) side to form an upper chord (80) and a lower chord (80). (42) and the upper column bracket 40 are lowered, but the upper column bracket 40 is lowered to the lower side of the post pile H2 by the seventh step (S7) and is located in the reinstalled upper column stopper 20. A ninth step (S9) of descending as much as possible;
After the ninth process (S9), the lower ground of the column lower bracket 50 is excavated so that the second basement slab 103 is constructed on the lower side of the first basement slab 102, and the ninth process (S9) A tenth step (10) of lowering the upper chord (80), the lower chord (42) and the column upper bracket (40) to the construction position of the second basement slab (102) by repeating the above;
After the 10th process (S10), the formwork 101 is seated and fixed on the upper surface of the upper current 80, and then the formwork 101 is poured and dried to construct the second basement floor slab 103. (S11);
After the 11th step (S11), the 5th step (S5) to the 10th step (S10) are repeated to construct the basement slab continuously to construct the underground structure. .
According to claim 1,
When connecting the upper end of the vertical hydraulic support jack 60 to the column upper bracket 40 and the lower end of the vertical hydraulic support jack 60 to the vertical support caster box 41 in the second step (S2),
After connecting the vertical support roll guide 62 to the upper end of the vertical hydraulic support jack 60, the vertical support roll guide 62 is positioned inside the vertical support caster box 41, and the vertical hydraulic support jack When the vertical support cylinder rod (60a) of (60) is pulled and retracted, the vertical support roll guide 62 is connected to guide while sliding along the inner longitudinal direction of the vertical support caster box 41 Improvement down-up construction method of underground structure to be.
According to claim 1,
When connecting the upper end of the horizontal support hydraulic jack 90 to the horizontal support plate 81 in the third process (S3),
The horizontal support cylinder rod 90a drawn out from the horizontal support hydraulic jack 90 is hingedly connected to the horizontal support plate 81, so that the horizontal support cylinder rod 90a of the horizontal support hydraulic jack 90 is tensioned and retracted. Improved down-up construction method for underground structures, characterized in that the horizontal support cylinder rod (90a) is hingedly guided with respect to the horizontal support plate (81).

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