JP2018197486A - Construction method for forming underground structure, and underground structure completed by the same - Google Patents

Abstract

To provide a construction method for forming an underground structure, and an underground structure completed by the method.SOLUTION: The construction method comprises a step to form a first wall structure including a plurality of first walls that are parallel to each other and define a construction region, a step to form a first underground sub-structure by providing a plurality of first permanent underground beams for supporting the plurality of first walls between the insides of the plurality of first walls, a step to excavate earth within the construction region up to a first depth, and a step to press the first underground sub-structure into a ground up to substantially the first depth using a tensile material with a guide function.SELECTED DRAWING: Figure 2A

Description

The present invention relates to a building construction method, and more particularly to a building construction method for an underground structure.

When building a building, it is necessary to first excavate the site to form an underground structure. Before excavating a site, it is usually necessary to first build a retaining wall structure around the site excavation site. Since the continuous wall has advantages such as high rigidity and water tightness and a large excavation depth, it has been widely applied to the retaining wall construction method for site excavation in recent years. In general, as a procedure for producing a continuous wall, first, a guide groove is dug in the ground around the construction area where the site is to be excavated, and then a groove is dug by a grab excavator to form the groove. Is installed in the groove and cement is poured to complete the construction of the continuous wall.

Referring to FIG. 1, in the conventional construction method for forming an underground structure 9, first, a groove for forming a continuous wall 91 is formed by excavating earth and sand from the ground 11, and cement is then placed in the groove. The continuous wall 91 is formed by pouring. Since the groove required for forming the continuous wall 91 is considerably deep, it is necessary to provide a temporary support body (for example, a steel plate, a temporary support beam, and a column) that supports the groove while excavating the groove. However, in the conventional construction method, not only is it time-consuming, but there is a possibility that the earth and sand on both sides of the groove may collapse.

As shown in FIG. 1, after forming the continuous wall 91, the builder excavates the earth and sand from the ground down to the depth required for the underground structure 9 in the construction area 10. In this excavation step, the earth and sand are excavated one layer at a time until the depth required for the underground structure 9 is reached, and a temporary support (e.g., steel plate, temporary support beam and It is necessary to provide pillars. The step of providing the excavation and the temporary support is also very laborious and the earth and sand on both sides of the construction area 10 may be destroyed. By the time the above steps are completed, the contractor cannot form the underground structure 9 by building the underground substructure 93 one by one from the bottom up in the space formed by the excavation of earth and sand.

In summary, in the conventional construction method of the underground structure 9 described above, the builder waits until the construction of the continuous wall 91 is completed, and then excavates the inside of the construction area to build the underground substructure 93 one by one. By doing so, the underground structure 9 must be formed, and therefore there are disadvantages that the cost is high and the construction period is long.

An embodiment of the present invention is to provide a construction method for forming an underground structure. The construction method supports the plurality of first walls between a step of forming a first wall structure including a plurality of first walls that are connected to each other to define a construction area, and the inside of the plurality of first walls. Providing a plurality of first permanent underground beams to form a first subsurface substructure, excavating earth and sand in the construction area to a first depth, and the first subsurface substructure Pushing from the ground to approximately the first depth.

Another embodiment of the present invention is to provide an underground structure formed by the above construction method.

FIG. 1 is a schematic cross-sectional view of a conventional underground structure. It is a flowchart of the step of one Example of the construction method of this invention. It is a flowchart of the detailed step of step S2 in FIG. 2A. It is a flowchart of the detailed step of step S3 in FIG. 2A. It is a flowchart of the detailed step of step S7 in FIG. 2A. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method. It is a schematic diagram of the structure formed based on each step of one Example of this invention construction method.

Please refer to FIGS. 2A to 2D and FIGS. 3A to 3L. One embodiment of the construction method for forming the underground structure 1 of the present invention is mainly composed of a step (step S1, details are shown in FIG. 3A) of forming a plurality of continuous guide grooves 12 on the ground 11, and a guide member. 16 (step S2, details are shown in FIGS. 3B-3E) and forming a first wall structure 32 that includes a plurality of first walls that are connected to each other to define the construction area 10 (step S3, FIG. 3F to 3H) and a plurality of first permanent underground beams 36 for supporting the plurality of first walls are formed between the inside of the plurality of first walls, thereby forming the first underground substructure 3 Step (see step S4, FIG. 3I), excavating the earth and sand in the construction area 10 to the first depth H1, and forming a plurality of first permanent pillars 43 (see step S5, FIG. 3I), 1 Sub-structure 3 is abbreviated Step pushing from the ground 11 to a depth of one H1 (step S6, see FIG. 3I) and a. Subsequently, in order to form the multi-layered underground structure 1, another embodiment of the construction method for forming the underground structure 1 of the present invention is the step of forming the second wall structure 40 after the above steps (step S7). 3J to 3K) and the second permanent underground beam 42 (see FIG. 3Lp) to form the second underground substructure 4 (see FIG. 3L), the first permanent underground beam 36 and the second A step of forming a second permanent column 45 between the permanent underground beam 42 (step S8, see FIG. 3L) and a step of excavating the earth and sand in the construction area 10 to the second depth H2 (step S9, FIG. 3L). And a step of pushing the first underground substructure 3, the second underground substructure 4, the first permanent pillar 43, and the second permanent pillar 45 from the ground 11 to the second depth H2 (step S10). Prepare. Below, the detail of the step of said another one Example is demonstrated according to a construction procedure.

As shown in FIG. 3A, step S1 includes forming a plurality of guide grooves 12 connected to the ground surface 11 in the construction area 10 (for example, guide grooves 12 having a depth of about 1 meter). The guide groove 12 is preferably formed on the outer peripheral edge of the construction area 10. For example, the guide groove 12 is dug in the ground 11 on the outer peripheral edge of the construction area 10 by an excavator.

FIG. 2B shows detailed steps S21, S22, S23 and S24 showing step S2 for providing the guide member 16. As shown in FIG. 3B, step S21 includes forming a plurality of holes 14 extending downward from the ground 11 and having a predetermined depth D. The hole 14 extends downward to the predetermined depth D in the guide groove 12. The hole 14 can be formed, for example, by drilling vertically downward in the guide groove 12 with a drilling machine. The predetermined depth D is determined in accordance with actual architectural design requirements. In a particular embodiment, the predetermined depth D is about 24 meters from the ground 11 but is not limited thereto.

In step S22, a plurality of elongated and flexible guide members 16 are provided in the plurality of holes 14, respectively. As shown in FIG. 3C, the plurality of guide members 16 are provided so as to extend to a predetermined depth D, thereby guiding the first underground substructure 3 shown in FIG.

As shown in FIG. 3D, step S23 of FIG. 2B is performed by injecting cement slurry from the plurality of holes 14 to fix one end of the plurality of guide members 16 to the plurality of bottom portions of the plurality of holes 14. Forming the consolidated region 18. The consolidated region 18 is earth and sand solidified by cement slurry. In certain embodiments, consolidation area 18 is located approximately 14-24 meters from ground 11 but is not limited to such.

As shown in FIG. 3E, step S24 of FIG. 2B includes covering the plurality of tubular objects 20 on the plurality of guide members 16, respectively. In one embodiment, the plurality of tubular objects 20 are connected to a plurality of plastic pipes, and extend along the substantially longitudinal direction of the plurality of holes 14. In step S <b> 24, it is preferable that one end of the plurality of tubular objects 20 is in contact with the consolidated region 18 in order to prevent the guide member 16 from being corroded by contact with the slurry in a subsequent cement injection operation.

FIG. 2C shows detailed steps S31, S32 and S33 showing step S3 of forming the first wall structure 32. As shown in FIG. 3F, step S31 includes preparing a plurality of rigid insertion sleeves 22. Each of the rigid insertion sleeves 22 has a gradually reducing end 221 and a connecting end 222 corresponding to the gradually reducing end 221. In this preferred embodiment, in step S31, each of the gradually reducing ends 221 of the rigid insertion sleeve 22 is provided in the plurality of continuous guide grooves 12, and the connection ends 222 of the plurality of rigid insertion sleeves 22 are placed on the ground 11. Expose. The gradually reducing ends 221 of the plurality of rigid insertion sleeves 22 are preferably sharp tips 24 inclined upwardly from the outside of the construction area 10 to the inside thereof with respect to the construction area 10, whereby the rear first underground sub In the step of pushing the structure 3 into the ground 11, the earth and sand are removed in the excavated space inside the construction area 10. The plurality of rigid insertion sleeves 22 are preferably made of steel, an alloy or other material with similar rigidity.

As shown in FIG. 3G, step S32 includes connecting the plurality of barrier plate structures 26 to the connection ends 222 of the plurality of rigid insertion sleeves 22, respectively. Preferably, in step S32, as shown in FIG. 3G, in the plurality of spaces 28 defined by the plurality of rigid insertion sleeves 22 and the plurality of dam plate structures 26, the plurality of force regions P by the plurality of dam plates 261. As shown in FIG. 3H, a plurality of depressions 30 for applying a force are formed inside the first wall structure 32. Specifically, the partition of the plurality of barrier plates 261 does not provide reinforcing bars or inject concrete into the applied region P, and thereby a plurality of members for applying a force to the inside of the first wall structure 32. In other words, the above-described force region P is positioned corresponding to the plurality of recesses 30 in the first wall structure 32.

As shown in FIG. 3H, step S33 includes forming a first wall structure 32 in a plurality of spaces 28 defined by the plurality of rigid insertion sleeves 22 and the plurality of barrier plate structures 26. Step S33 further includes forming a first wall structure 32 made of reinforced concrete by providing a plurality of reinforcing rods (not shown) in the plurality of spaces 28 and performing cement injection. In a particular embodiment, the first wall structure 32 is composed of precast reinforced concrete. In another particular embodiment, the first wall structure 32 is preferably about one floor above the ground 11. In another particular embodiment, the first wall structure 32 can be provided with indentations 30 as shown in FIG. 3H every 5-10 meters laterally, defined by a plurality of first walls of the first wall structure 32. The construction area 10 is a closed construction area 10.

In one embodiment shown in FIG. 3G, the plurality of guide members 16 are a plurality of metal cables, and when the barrier plate structure 26 is provided in step S32, the plurality of guide members 16 formed in advance by the plurality of metal cables. These are extracted from the applied region P partitioned by a plurality of barrier plates 261. Accordingly, as shown in FIG. 3H, when the first wall structure 32 is formed in step S33, the plurality of guide members 16 formed of the plurality of metal cables are arranged so as to be extracted from the plurality of depressions 30. Is done.

As shown in FIG. 3I, step S4 includes a plurality of first permanent underground beams 36 (basement chambers) for supporting the plurality of first walls between the insides of the plurality of first walls of the first wall structure 32. Forming the first subsurface substructure 3 by providing (also referred to as foundation beams or lattice beams). The permanent underground beam 36 is not a temporary support body that supports a plurality of first walls at a time, but is fixed to the first wall structure 32 and becomes a permanent part of the completed underground structure 1. It is. The permanent underground beam 36 may be cast on site, may be precast reinforced concrete, or may be a concrete-coated steel structure.

As shown in FIG. 3I, step S5 includes excavating the earth and sand in the construction area 10 to the first depth H1. Step S6 includes pushing the first underground substructure 3 into the ground 11 to approximately the first depth H1. Since the plurality of tubular objects 20 are covered on the plurality of guide members 16, the plurality of tubular objects 20 can slide relative to the corresponding plurality of guide members 16. Therefore, the first wall structure 32 coupled to the tubular object 20 is not fixed to the plurality of guide members 16. Due to the covering relationship between the plurality of tubular objects 20 and the corresponding plurality of guide members 16, the first wall structure 32 can slide the plurality of guide members 16. In step S <b> 6 of this embodiment, the installer pushes the first underground substructure 3 from the ground 11 by applying a thrust downward by the jacks 34 in the plurality of depressions 30. Step S6 pushes the tips 24 of the plurality of rigid insertion sleeves 22 from the original depth of 1 meter, for example, to a first depth H1 of 4 meters, for example, preferably a depth of the first floor. After this pushing step is completed, the first wall structure 32 can be an outer wall of an underground structure (basement).

In the embodiment shown in FIG. 3H, the installer provides a plurality of jacks 34 in the plurality of depressions 30, and each of the plurality of jacks 34 to a plurality of guide members 16 formed of a plurality of corresponding metal cables. Connecting. As a result, the plurality of jacks 34 used in step S6 apply force to the plurality of guide members 16 each formed of a plurality of metal cables, and the plurality of guide members 16 formed of the plurality of metal cables respectively. The first underground substructure 3 is pushed in from the ground 11 by the reaction force due to the consolidation relationship connected to the plurality of consolidation regions 18. In the present embodiment, the gradually reducing ends 221 of the plurality of rigid insertion sleeves 22 have a tip 24 that is inclined upward from the outside of the construction area 10 to the inside thereof with respect to the construction area 10. Simultaneously with the downward pressing, the gradually reducing end 221 can remove earth and sand to the inside of the construction area 10 excavated in step S5 and having a space.

In another embodiment, the guide member 16 formed of a plurality of metal cables is extracted from above the first wall structure 32 and applies a downward thrust from above the first wall structure 32. At this time, the first wall structure 32 can slide the plurality of guide members 16 by the covering relationship between the plurality of tubular objects 20 fixedly contacted thereto and the corresponding guide members 16. The first underground substructure 3 is pushed in from the ground 11. In this embodiment, the installer provides a plurality of jacks 34 on the first wall structure 32, and applies a force to each of the plurality of guide members 16 formed of a plurality of metal cables by the plurality of jacks 34. The first underground substructure 3 is pushed into the ground 11 by a reaction force due to a consolidation relationship in which a plurality of guide members 16 formed of metal cables are respectively connected to a plurality of consolidation regions 18.

The plurality of guide members 16 are tendons referred to in the ground anchor method in one embodiment, and are made of a tensile material. The tensile material may be a steel product and / or other material, the steel product being a steel bar (eg a rigid bar according to the provisions of CNS9272 G3192), a steel wire or a steel strand (eg CNS 3332 G3073). Steel stranded wire according to regulations), other materials include materials such as glass fiber.

In step S6, after the first underground substructure 3 is pushed into the ground 11, in order to form the rear wall structure on the first wall structure 32 and to construct the multilayer underground structure 1 having a desired height, The following steps S7 to S10 are further provided.

FIG. 2D shows detailed steps S71 and S72 showing step S7 for forming the second wall structure 40 shown in FIG. 2A. As shown in FIG. 3J, step S71 includes connecting a plurality of barrier plate structures 38 to the upper ends of the first wall structures 32, respectively. As shown in FIG. 3K, step S <b> 72 includes forming a second wall structure 40 including a plurality of second walls above the first wall structure 32 in the barrier plate structure 38. The first wall structure 32 and the second wall structure 40 are connected to each other by injecting concrete after being overlapped with each other by a reinforcing bar provided in advance, or by other connecting means. The structure 40 is connected.

As shown in FIG. 3L, step S8 of FIG. 2A includes a plurality of second walls for supporting the plurality of second walls of the second wall structure 40 between the insides of the plurality of second walls of the second wall structure 40. By providing two permanent underground beams 42, a second underground substructure 4 is formed, and a plurality of second underground substructures 36 and a plurality of second permanent underground beams 42 are provided between the plurality of second permanent underground beams 42. Forming the permanent pillar 45. Step S9 in FIG. 2A includes excavating the earth and sand in the construction area 10 to a second depth H2 deeper than the first depth H1. Step S10 in FIG. 2A includes a plurality of jacks 34 in which the first underground substructure 3, the second underground substructure 4, the plurality of first permanent columns 43, and the plurality of second permanent columns 45 are positioned in the plurality of depressions 30. , And pushing down to approximately the second depth H2.

In the construction method of the underground structure 1 according to the present invention, the first underground floor layer F1 is laid above the plurality of first permanent underground beams 36, and the first permanent pillar 43 is below the first permanent pillar 43. It is preferable to further include forming an underground structure floor layer F0 for supporting the pillar 43.

The steps S7 to S10 are repeated until the desired depth of the wall and the underground structure is completed, and the multilayered second wall structure 40 is formed on the completed wall structure, and the second permanent underground Steps such as building the beam 42 and pushing in the second wall structure 40 are performed in order.

According to the above, FIG. 3L shows the first underground substructure 3, a plurality of holes 14 extending downward from the ground 11 and having a predetermined depth D, and provided in the plurality of holes 14. And a plurality of consolidated regions 18 formed at a plurality of bottom portions of the plurality of holes 14 and fixing one end of the plurality of guide members 16. The completed underground structure 1 is shown. Further, the plurality of tubular objects 20 extend along the substantially longitudinal direction of the plurality of holes 14. The first underground substructure 3 is provided between the first wall structure 32 and the plurality of first walls of the first wall structure 32, and a plurality of first permanent lands for supporting the plurality of first walls. An intermediate beam 36 and a first permanent pillar 43 are provided.

The underground structure 1 further includes a plurality of tubular objects 20 covered by the plurality of guide members 16 and a plurality of rigid insertion sleeves 22. The gradually reducing ends 221 of the plurality of rigid insertion sleeves 22 are preferably sharp edges 24 inclined upward from the outside of the construction area 10 to the inside thereof with respect to the construction area 10. Preferably, the plurality of rigid insertion sleeves 22 are made of steel or an alloy. In a preferred embodiment, the plurality of guide members 16 are a plurality of metal cables, which are extracted from a plurality of recesses 30 corresponding thereto.

The underground structure 1 of the present invention is provided between the second wall structure 40 formed on the first wall structure 32 and the plurality of second walls of the second wall structure 40, and the plurality of second walls are A plurality of second permanent underground beams 42 for supporting and forming the second underground substructure 4 are further provided. A plurality of second permanent columns 45 are further formed between the plurality of first permanent underground beams 36 and the plurality of second permanent underground beams 42.

The underground structure 1 of the present invention preferably further includes a first underground floor layer F1 and an underground structure floor layer F0 laid above the plurality of first permanent underground beams 36.

In summary, according to the construction method of the underground structure 1 of the present invention, the underground structure 1 can be formed, the inside of the construction region 10 can be excavated, and permanent underground beams and permanent columns can be provided simultaneously. Therefore, it has the advantages of good quality, low cost and short construction period.

The present invention has been explained by the related embodiments already described above, but the above embodiments are merely examples for carrying out the present invention. It should be noted that the disclosed embodiments are not intended to limit the scope of the invention. On the contrary, all modifications and equivalent installations included in the spirit and scope of the claims are included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1: Underground structure 10: Construction area 11: Ground 12: Guide groove 14: Hole 16: Guide member 18: Consolidation area 20: Tubular object 22: Insertion sleeve 221: Reducing end 222: Connection end 24: Pointed end 26: Weir Plate structure 261: Dam plate 28: Space 30: Indent 3: First underground substructure 32: First wall structure 34: Jack 36: First permanent underground beam 38: Dam plate structure 4: Second underground substructure 40: Second wall structure 42: Second permanent underground beam 43: First permanent column 45: Second permanent column 9: Underground structure 91: Continuous wall 93: Underground substructure D: Predetermined depth H1: First depth H2 : Second depth F1: First underground floor layer F0: Underground structure floor layer P: Applied area S1 to S10: Steps S21 to S24: Steps S31 to S33: Steps S71 to S72: Step

Claims (14)

A construction method for forming an underground structure,
Forming a first wall structure that includes a plurality of first walls that are connected together to define a construction area;
Forming a first underground substructure by providing a plurality of first permanent underground beams for supporting the plurality of first walls between the inside of the plurality of first walls;
Excavating the earth and sand in the construction area to a first depth;
Pushing the first underground substructure into the ground substantially to the first depth. Before the step of forming the first wall structure,
Extending downward from the ground to form a plurality of holes having a predetermined depth;
Providing a plurality of elongated and flexible guide members in the plurality of holes, extending to a predetermined depth so as to guide the pushing of the first underground substructure into the ground;
Fixing a first end of the guide member by forming cemented slurry from the plurality of holes to form a plurality of consolidated regions at a plurality of bottoms of the plurality of holes;
The construction method according to claim 1, further comprising: The step of covering the plurality of guide members with a plurality of tubular objects extending along substantially the longitudinal direction of the plurality of holes before the step of forming the first wall structure is provided. The construction method described. The step of forming the first wall structure comprises:
Forming a plurality of depressions for applying a force inside the first wall structure by partitioning a plurality of force application regions by a plurality of barrier plates in the space;
The construction method according to claim 3, wherein the step of pushing the first underground substructure into the ground applies a plurality of downward thrusts in the plurality of depressions. The plurality of guide members are a plurality of metal cables,
In the construction method, the plurality of metal cables are extracted from the plurality of depressions, a plurality of jacks are provided in the plurality of depressions, and a force is applied to the plurality of metal cables by each of the plurality of jacks. The construction method according to claim 4, further comprising pressing the first underground substructure into the ground by a reaction force caused by each of the metal cables connected to the plurality of consolidated regions. The plurality of guide members are a plurality of metal cables, and the construction method includes extracting the plurality of metal cables from an upper end of the first wall structure and a plurality of metal cables at an upper end of the first wall structure. Providing a jack, applying a force to the plurality of metal cables by the plurality of jacks, and reacting the plurality of metal cables to the plurality of consolidated regions, thereby causing the first underground substructure to be The construction method according to claim 3, further comprising pushing into the ground. After the step of excavating the earth and sand in the construction area to a first depth, further comprising forming a first permanent column below the plurality of first permanent underground beams and defined by the plurality of first walls. The construction method according to claim 3, wherein the constructed construction area is a closed construction area. The step of forming the first wall structure comprises:
Providing a plurality of rigid insertion sleeves each having a gradually reducing end and a connecting end corresponding to the gradually reducing end;
Connecting a plurality of barrier plate structures to the connection ends of the plurality of rigid insertion sleeves, respectively;
The construction method according to claim 7, further comprising: forming the first wall structure in a plurality of spaces respectively defined by the plurality of rigid insertion sleeves and the plurality of barrier plate structures. Before the step of forming the first wall structure,
Forming a plurality of continuous guide grooves in the ground;
The construction method according to claim 8, further comprising the step of providing the gradually reducing ends of the plurality of rigid insertion sleeves in the plurality of continuous guide grooves, respectively. The gradually reducing edge is a sharp tip inclined upward from the outside of the construction area to the inside thereof with respect to the construction area, and in the step of pushing the first underground substructure into the ground, The construction method according to claim 8, wherein earth and sand are excluded to the inside of the region. The construction method according to claim 8, wherein the step of forming the first wall structure includes providing a plurality of reinforcing bar rods in each of the plurality of spaces and injecting cement. Connecting a plurality of barrier plate structures to an upper end of the first wall structure;
Forming a second wall structure including a plurality of second walls;
Forming a second subsurface substructure by providing a plurality of second permanent underground beams for supporting the plurality of second walls between the inside of the plurality of second walls;
Forming a plurality of second permanent columns between the plurality of first permanent underground beams and the plurality of second permanent underground beams;
Excavating the earth and sand in the construction area to a second depth deeper than the first depth;
Pushing the first subsurface substructure, the second subsurface substructure, the plurality of first permanent columns, and the plurality of second permanent columns substantially to the second depth;
The construction method according to claim 8, further comprising: 13. The method according to claim 12, further comprising: laying a first underground floor floor layer above the plurality of first permanent underground beams; and forming an underground structure floor floor layer below the first permanent pillar. The construction method described. The underground structure formed by the construction method of any one of Claims 2-13.

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