KR20110096339A - Construction method of basement structure of building using soil wall composed of PH pile - Google Patents

Abstract

The present invention relates to a method of constructing a basement outer wall of a building to be integrated with a retaining wall. In particular, the present invention relates to a retaining wall composed of PHC piles that can serve as a pile for supporting a ground layer structure and can be used as an external formwork for building a basement wall. The present invention relates to a method of constructing a basement structure of a building using an earthquake wall composed of a PHC pile supporting a ground layer structure by a plywood consisting of a PHC pile and an outer wall of the basement layer.
According to a preferred embodiment of the present invention, a PHC pile is installed along the ground boundary line to construct the earth wall, and the head of the PHC pile is arranged, and then a stress transmission beam connecting the heads of the PHC piles arranged in a line is constructed. To excavate to the lowest floor while supporting the walls, construct the foundation slab on the bottom of the excavated bottom layer, repeat the steps of constructing the outer wall and the basement slab, and then construct the ground floor slab to complete the basement structure of the building. In the longitudinal direction of a pair of base plates in which the stress transmission beams are inserted into the hollows of respective PHC piles by inserting a cylindrical reinforcing bar network formed by fixing a plurality of vertical rebars with a spiral reinforcing bar, and spaced apart from each other. Joining the abdominal reinforcement bars to protrude perpendicularly to the base plate at regular intervals along the A pair of intermediate reinforcing bars connecting the upper part of the upper part and the middle part of the abdominal reinforcing bars to each other are fixed in parallel to the base plate, and then the base plate is placed on the upper surface in the direction crossing the PHC piles. There is provided a construction method of a basement structure of a building using a retaining wall composed of a PHC pile, which is fixed to the abdominal reinforcement, and after the formwork is installed, the concrete is poured to fill the hollow of the PHC pile.

Description

Construction Method of Undergroud Structure Using PHC Pile

The present invention relates to a method of constructing a basement outer wall of a building to be integrated with a retaining wall. In particular, the present invention relates to a retaining wall composed of PHC piles that can serve as a pile for supporting a ground layer structure and can be used as an external formwork for constructing a basement wall. The present invention relates to a method of constructing a basement structure of a building using an earthquake wall composed of a PHC pile supporting a ground layer structure by a plywood consisting of a PHC pile and an outer wall of the basement layer.

In the case of the construction of the downtown building, when the underground structure is installed close to the ground boundary line, there is no work space for the exterior wall frame construction, so it is constructed as a plywood wall using the earthen wall as the external formwork for the construction of the exterior floor of the building.

When the wall is composed of H-pile + earth plate, H-PILE (Thumb pile; 300x200x9x14, 300x300x10x15), Wale; 300x300x10x15 (H-PILE), and work order (LW) to provide the minimum space for the wall. (Water glass contract amount injection method) At least 1,100mm is required considering the space for at least 500mm when applying the method and at least 600mm when applying the Space Grouting Rocket System (SGR) method. Even if there is no liner, at least 550mm is required on the ground boundary line when using the drilling machine to secure the construction space. In order to install inclinometers and ground level gauges on the back ground, the crawler drill requires at least 400mm of space, so 550 + 400 = 950mm is required to construct the wall. In conclusion, the outer wall of the building should be at least 1M above the boundary of the land to be able to construct a plywood wall (use the wall as an external formwork), and at least 1.5M should be needed to refill the plywood instead of the plywood wall. Therefore, when the outer wall line and the ground boundary line is less than 1M on the construction drawing, the minimum thickness of the wall should be calculated and the construction of the retaining wall should be planned in the range where reinforcement is possible.

Even if it is planned to be plywood, the rebar reinforcement is not a problem when the reinforcement and the outer wall coincide according to the relationship between the clamboard and the outer wall of the building, but there is a problem that the amount of concrete increases considerably. There is a problem that the construction is delayed because the silver belt may need to be removed.

8 is a cross-sectional view showing the construction of the earthen wall by the CIP method and the construction of the outer wall of the basement layer as a laminated wall.

As shown in FIG. 8 when the earthen wall is drilled with an auger or boring, the independence of the hole is treated with a stabilizer or a casing, and the concrete is placed in the hole to build a main heat wall in the ground. (CIP mudwall, 100) thickness (400mm), basement layer outer wall (200) thickness (300 ~ 400mm) and the length of the inner part 310 of the floor slab 300 (400mm) in total of about 1100 ~ 1200mm It becomes thickness. In addition, since the CIP mud wall 100 is not used as the basis of the structure, the ground floor pillars or walls 400 are not installed on the mud wall 100, but are installed on the basement outer wall 200, so that the ground floor is the building floor. The area will not be fully utilized, which will greatly affect the feasibility and economic feasibility of building remodeling or expansion. This problem also appears when the barrier wall is composed of H-pile + earth plate.

The problem to be solved by the present invention is to provide a construction method of a building basement floor structure using a retaining wall consisting of PHC pile that can function as a pile supporting the ground floor structure and at the same time as an external formwork to build a basement wall.

According to a preferred embodiment of the present invention, a PHC pile is installed along the ground boundary line to construct the earth wall, and the head of the PHC pile is arranged, and then a stress transmission beam connecting the heads of the PHC piles arranged in a line is constructed. To excavate to the lowest floor while supporting the walls, construct the foundation slab on the bottom of the excavated bottom layer, repeat the steps of constructing the outer wall and the basement slab, and then construct the ground floor slab to complete the basement structure of the building. In the stress transmission beam, a longitudinal reinforcement of a pair of base plates arranged in parallel to each other by inserting a cylindrical reinforcing bar network formed by fixing a plurality of vertical rebars with a spiral rebar into the hollow of each PHC pile Joining the abdominal reinforcement bars to protrude perpendicularly to the base plate at regular intervals along the A pair of intermediate reinforcing bars connecting the upper part of the upper part and the middle part of the abdominal reinforcing bars to each other are fixed in parallel to the base plate, and then the base plate is placed on the upper surface in the direction crossing the PHC piles. There is provided a construction method of a basement structure of a building using a retaining wall composed of a PHC pile, which is fixed to the abdominal reinforcement, and after the formwork is installed, the concrete is poured to fill the hollow of the PHC pile.

According to another suitable embodiment of the present invention, the basement slab is connected to the PHC pile using an intermediate layer border beam, and the intermediate layer border beam has a base with a predetermined distance along a longitudinal direction of a pair of base plates arranged parallel to each other at a distance. After joining a plurality of abdominal reinforcement to protrude perpendicular to the plate, and fixing the upper reinforcement connecting the upper part of the abdominal reinforcement and a pair of intermediate reinforcement connecting the middle part of the abdominal reinforcement to each other in parallel to the base plate, The base plate is fixed to a position where basement slabs are to be installed in a direction crossing the PHC piles so as to project vertically toward the excavation surface, and after the formwork is installed, the base plate is constructed integrally with the outer wall and the basement slab concrete.

According to another suitable embodiment of the present invention, the outer surface of the PHC pile fixed a plurality of shear connecting members at regular intervals along the longitudinal direction, install metallas and then cast the basement outer wall concrete to integrate the PHC pile and basement outer wall integrally To synthesize.

According to another suitable embodiment of the present invention, a bracket having a larger dance compared to other parts of the foundation slab is disposed on the lower surface of the foundation slab where the foundation slab and the basement outer wall contact each other so that loads transmitted through the basement outer wall are evenly transmitted to the ground. An additional portion is formed.

According to another suitable embodiment of the present invention, a pair of order grouting grooves are formed on the outer circumferential surface of the PHC pile with a predetermined eccentric distance to the rear of the center line passing through the center of the cross section.

  According to the construction method of the basement structure of the building using the earthquake wall consisting of the PHC pile according to the present invention, since the PHC pile and the basement outer wall together with the earthquake wall transfer the loads transmitted from the ground floor structure to the ground, the pillar or wall of the ground floor is maximized. It can be installed close to the boundary of the land, so the use of the land is high and the wall thickness can be reduced when constructing the plywood.

The following drawings, which are attached in the present specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a view schematically showing a process of constructing a building basement structure according to an embodiment of the present invention.
Figure 2 is a cross-sectional view schematically showing a state in which the PHC pile is applied to build the retaining wall according to the present invention.
Figure 3 is a perspective view showing a state in which the reinforcement constituting the stress transmission beam is installed on the upper surface of the PHC pile.
4 is a cross-sectional view showing a state in which the basement outer wall is integrally synthesized on the front surface of the PHC pile.
5 is a perspective view showing a state in which a reinforcement is installed to connect the PHC pile and the basement slab to reinforce the intermediate layer rim beam to transfer the load transferred from the basement slab to the PHC pile and the basement outer wall is fixed to the PHC pile.
6 is a cross-sectional view schematically showing a building basement structure constructed in accordance with the present invention.
7 is a view schematically showing a process of constructing a building basement structure according to another embodiment of the present invention.

In the following the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the embodiments presented are exemplary for a clear understanding of the present invention is not limited thereto.

1 is a view schematically showing a process of constructing a building basement structure according to an embodiment of the present invention.

Construction method of the building basement structure using the earthquake wall consisting of the PHC pile according to an embodiment of the present invention, after completing the excavation to the lowest floor by the method of constructing the basement structure sequentially from the lowest floor to the earthquake wall (10) construction Step (a), PHC pile head clearance and stress transfer beam 20 construction step (b), excavation step (c), foundation slab 30 construction step (d), the bottom outer wall 40 and the bottom layer + one layer slab (50) the construction step (e), and the outer wall construction and underground floor slab construction iteration (f) after the ground layer slab 60 construction step (g).

(a) Wall  Build phase

The PHC pile 11 constituting the retaining wall 10 may be constructed by a buried pile method. That is, the cement paste is injected while drilling the ground along the ground boundary line and the PHC pile 11 is inserted and finally struck, or the tip fixing liquid and the main surface fixing liquid are injected while the ground is drilled, and the PHC pile 11 is inserted again. The PHC file 11 can be installed in a line in the underground. However, if the effects of noise or vibration can be neglected, it is also possible to construct by type method.

 Figure 2 is a cross-sectional view schematically showing a state in which the PHC pile is applied to build the retaining wall according to the present invention.

PHC file 11 to be applied to the present invention is also possible to apply a known PHC file, but in that case there is a disadvantage that a separate process may be required for the order. Accordingly, in the present invention, as shown in FIG. 2, the PHC has a predetermined eccentric distance e in a rearward (back side) with respect to the center line CL passing through the center of the cross section on the outer circumferential surface and a pair of order grouting grooves 111 are formed. Apply file 11.

Thus, a pair of order grouting groove 111 is formed to have a predetermined eccentric distance (e) to the rear with respect to the center line (CL) passing through the center of the cross section has the advantage that can be constructed as close as possible. If a pair of order grouting grooves 111 are formed on the center line CL passing through the center of the cross section, the grouting agent is spaced apart from each other to allow the grouting agent to spread to the rear of the pile, and also to prevent the grouting agent from leaking forward. Although it is necessary to take a countermeasure, when the degree grouting groove 111 has a predetermined eccentric distance e rearward with respect to the center line CL passing through the center of the cross section as in the present invention, the grouting agent is brought into close contact with the adjacent pile. It can be prevented from leaking.

In addition, in the past, the diameter of the drilling hole needed to be drilled about 10 cm larger than the diameter of the pile. However, when the PHC pile 11 according to the present invention is applied, the diameter of the drilling hole can be made much smaller. Construction is possible as close as possible.

As an injection method of the grouting agent (chemical liquid), a known LW method (Lables Wasser Glass), SCW method (Special Chemical Grouting Method), JSP method (Jumbo Specila Pile), etc. may be selectively applied.

(b) PHC Pile head and stress transfer beam construction stage

When the construction of the PHC pile 11 is completed, the head of the PHC pile 11 is arranged before the construction of the stress transmission beam 20. At this time, the head of the PHC pile 11 is cleanly cut to the steel wire by a cutter.

After completion of the head to the excavation to a certain depth and then to connect the head of each PHC pile 11 to construct a stress transmission beam 20 that is the foundation on which the ground floor column or wall () is built.

Figure 3 is a perspective view showing a state in which the reinforcement constituting the stress transmission beam is installed on the upper surface of the PHC pile.

As shown in FIG. 3, the reinforcement 20a constituting the stress transmission beam 20 according to the present invention is provided with respect to the pair of base plates 21a and 21b and the base plates 21a and 21b. A plurality of abdominal reinforcing bars (22), the upper reinforcing bar 23 and the pair of intermediate reinforcing bars (24a) and 24b, which connects the abdominal reinforcing bars (22) vertically spaced from each other are installed hollow It includes a plurality of vertical reinforcement 26 and a spiral reinforcement 27 surrounding the vertical reinforcement 26 and inserted into the upper end is fixed to the abdominal reinforcement (22).

The pair of base plates 21a and 21b are each composed of a strip-shaped steel sheet having a constant thickness and a longer length than the width, and they are arranged in a direction crossing the PHC piles 11 on the upper surface of the PHC pile 11. They are arranged parallel to each other at intervals. PHC pile (11) is to clean the head after the construction, this time because the cutting by cutting the pile including the steel wire to clean the seat plate fixed to the head of the pile is also removed abdominal reinforcement (22) on the upper surface of the PHC pile (11) It is difficult to fix it. The base plates 21a and 21b provide a surface on which the abdominal reinforcement 22 can be welded.

On the upper surface of the base plates 21a and 21b, a plurality of abdominal reinforcing bars 22 are welded at regular intervals along the longitudinal direction of the base plates 21a and 21b perpendicular to the surface. Abdominal reinforcing bar 22 is bent in a substantially c-shaped shape and has a leg portion 222 extending horizontally at each end. The abdominal reinforcing bar 22 may be bent in a rod-like member in multiple stages to form the leg portion 222 and the c-shaped portion 221 integrally. The leg portion 222 may be bent to be retracted inwardly or spread outwardly and welded to the upper surfaces of the base plates 21a and 21b. When bent inwardly, the vertical portion 221a of the c-shaped portion 221 is formed to extend vertically at the end in the width direction of the base plates 21a and 21b, thereby forming a larger cross section of virtual concrete. And the more stress transfer beam can thus have a greater load capacity.

The upper reinforcing bar 23 is provided so as to connect the upper part of the abdominal reinforcement 22 (upper part of the part projecting perpendicularly from the base plate) to each other, and the intermediate reinforcing bars 24a and 24b are provided to connect the middle part.

The upper reinforcing bar 23 is composed of at least two and is installed in parallel to the base plate (21a) (21b) to connect the horizontal portion (221b) of the abdominal reinforcement (22) with each other. In the drawing, the three upper bars 23 were welded in parallel to the base plates 21a and 21b at the bottom of the horizontal portion 221b of the abdominal rebar 22 at equal intervals, but the number of the upper bars 23 was increased. Is not limited thereto, and the installation position may also be installed above the horizontal portion 221b.

The intermediate reinforcing bars 24a and 24b are formed in at least two pairs and are installed in parallel to the upper reinforcing bars 23 so as to connect the vertical portions 221a of the abdominal reinforcing bars 22 to each other. In the figure, the three pairs of intermediate bars 24a and 24b are welded in parallel to the upper bar 23 inside the vertical portion 221a of the abdominal reinforcement 22 at equal intervals, but the intermediate bars 24a ( The number of 24b) is not limited thereto, and the installation position thereof may also be installed outside the vertical portion 221a.

A plurality of vertical rebars 26 are installed to be inserted into the hollow of each PHC pile 11. The vertical rebar 26 is disposed along the circumference of the hollow of the PHC pile 11 and each vertical rebar 26 is spaced from each other. Accordingly, the vertical rebar 26 is inserted into the hollow of the PHC pile 11 while forming a cylindrical shape. An upper end of the vertical bar 26 of some of the plurality of vertical bars 26 may be connected to the horizontal portion 221b of the abdominal bar 22. For convenience of assembly, a hook portion may be formed at an upper end of the vertical rebar 26 connected to the abdominal rebar 22.

The spiral reinforcement 27 is installed to surround the vertical rebar 26 from the outside in order to fix the positions of the plurality of vertical rebars 26. Spiral reinforcing bar 27 may be coupled to the vertical bar 26 by welding at the intersection with the vertical bar (26).

The reinforcement 20a configured as described above welds the plurality of abdominal reinforcements 22 to the pair of base plates 21a and 21b, and the upper reinforcement 23 and the intermediate reinforcements 24a and 24b to the abdominal reinforcement 22. To form a rectangular cylindrical reinforcing bar network with open bottom, which is located on the upper surface of the PHC pile 11, and welds spiral reinforcing bars 27 to a plurality of vertical rebars 26 to form a cylindrical reinforcing bar network. It is inserted into and fixed into the hollow of the PHC pile 11. The depth at which the cylindrical rebar mesh combined with the vertical rebar 26 and the spiral reinforcement 27 is inserted into the hollow of the PHC pile 11 may be inserted slightly longer than the diameter or diameter of the PHC pile 11, but the insertion depth The present invention is not limited thereto, and the depth may be such that the PHC pile 11 and the stress transmission beam 20 may be integrally formed with respect to the cross-sectional force acting on the joint of the head and the stress transmission beam 20 of the PHC pile 11. .

After the installation of the reinforcement (20a) is completed, the formwork is installed, then concrete is poured and hardened. At this time, the concrete is filled in the hollow of the PHC pile 11, the stress transmission beam 20 and the PHC pile 11 is integrated. In this way, the stress transmission beam 20 formed on the upper portion of the PHC pile 11 may be shaped like a conventional T-shaped cross section beam or a rectangular cross section beam. And a vertical member such as a column or a wall of the ground layer structure is installed on the stress transmission beam 20. In the present invention, the structure of the reinforcement (20a) embedded in the concrete is composed of a square cylindrical mesh network so that the stress transmission beam for supporting the vertical member of the upper layer structure is effectively reinforced, the head of the PHC pile 11 is a vertical reinforcement and spiral It is reinforced with a cylindrical reinforcing bar composed of reinforcing bars and filled concrete. Therefore, the stress transmission beam 20 and the PHC pile 11 behave integrally, thereby transferring the load transmitted from the ground layer wall or the pillar to the PHC pile 11, and the PHC pile against the side pressure acting on the retaining wall upon excavation. The PHC files can be linked together so that they act integrally.

(c) excavation stage

Construct the stress transmission beam 20 to configure the PHC piles 11 to be integrally acting on the side pressure and then start excavation while supporting the retaining wall (10).

Various methods are known as a method of excavation while supporting the retaining wall to resist side pressure such as earth pressure and water pressure, and in the present invention, various methods are known in the present invention. Since it can be appropriately selected and applied in consideration, a detailed description of the support method or excavation method of the retaining wall will be described within the scope necessary to understand the present invention. Therefore, the present invention is not limited to the supporting method and the excavation method of the retaining wall described below.

In the present invention, a brace method can be applied as a method for supporting the retaining wall composed of PHC piles. In order to apply the brace method, it is necessary to first support the brace and at the same time construct the internal pillar that becomes the pillar of the structure. The installation method of the column can be applied as it is applied in the known top-down method or the Strut as Permanent System (SPS) method. For example, drill the location where the column is to be installed, as in the top-down method, install the prefabricated foundation reinforcing bar and steel column using the crane, and the foundation part is concrete, and the rest part is gravel or empty mixture. Prevents the movement of steel columns installed with concrete. When the installation of the inner column is completed, repeat the process of installing the brace to connect the strip and the inner column to support the earth wall and excavate until the planned dig is reached.

However, the present invention is not limited to supporting the retaining wall by the strut method, and the retaining wall may be arbitrarily selected from methods known in the art, such as a supporting method by a ground anchor and a supporting method by a nail nail.

(d) foundation slab construction stage

After the excavation is completed to the planned excavation height, the foundation slab, that is, the bottom floor slab 30, is first constructed. In the case of the foundation slab 30, the entire floor is simultaneously excavated and poured into concrete, or starting from excavation from the central part, the concrete is poured and the remaining part is excavated again. Can be. The lower surface of the foundation slab 30 where the foundation slab 30 and the basement outer wall 40 are in contact with each other, compared to other parts of the foundation slab 30 so that the load transmitted through the basement outer wall 40 is evenly transmitted to the ground. The large dance bracket 31 is formed.

(e) Plywood  And basement floor slab construction

4 is a cross-sectional view showing a state in which the basement outer wall is integrally synthesized on the front surface of the PHC pile 11.

After the construction of the bottom floor slab 30 is completed, a plurality of shear connection members 41 are fixed at regular intervals along the length direction on the outer surface of the PHC pile 11 corresponding to the bottom floor, and metallases 42 are installed. After removing the strips and braces of the floor corresponding to the lowest floor and the first floor, the formwork is installed to construct the floor slab, and the reinforcement is completed.The concrete is then placed on the bottom floor and the first floor slab (50) and the bottom floor (40) concrete. Build the lowest plywood by pouring Shear connector 41 is resistant to the in-plane shear force between the PHC pile 11 and the basement outer wall concrete can be applied studs known to be able to synthesize and act integrally, and the installation method is PHC pile (using a drill) You can apply the method of inserting and fixing the stud after making a hole in 11). The metal lath 42 is installed for the purpose of suppressing the occurrence of cracks as well as improving adhesion and strength of the basement outer wall concrete.

After the lowermost plywood is constructed, the strips and braces of the upper layer, that is, the lowermost layer + the second layer, are removed, and then a plurality of shear connecting members 41 are installed on the outer surface of the PHC pile 11 and the metal laths 42 are fixed. Next, the step of pouring the floor concrete 50 and the concrete of the layer outer wall 40 is repeated to repeat the process of constructing the layered wall to the ground floor-1 floor.

(f) Ground floor floor construction stage

Finally, the ground layer slab 60 (underground roof slab) is constructed, wherein the ends of the ground layer slab 60 are integrally connected to the pre-constructed stress transmission beam 20. To this end, the reinforcing bar of the stress transmission beam 20 may be exposed so as to be connected to the ground layer slab rebar in advance when the construction of the stress transmission beam 20. Alternatively, the construction of the ground layer slab 60 may be simultaneously performed in the construction of the stress transmission beam 20. In this case, the ground layer slab 60 is embedded into the ground layer bottom reinforcing stress cutting beam 20, and the ends thereof are bent and fixed.

As described above, in the present invention, when excavating a retaining wall composed of PHC piles, as in the existing retaining wall, it resists side pressure such as earth pressure or hydraulic pressure acting on the back of the retaining wall, and at the same time, after the excavation is completed, the basement outer wall is completed. It is used as an external formwork for construction, and after the exterior wall is constructed, it is synthesized integrally with the exterior wall to serve as a foundation for transmitting the load transmitted from the ground layer structure to the ground. Therefore, it is possible to install a wall or column of the ground layer on the upper part of the stress transmission beam, and thus, unlike the conventional art, it is possible to construct the column or wall of the basement layer and the ground layer as close as possible to the boundary of the land, so that the use of the land is high and the wall thickness is increased when constructing the plywood wall. As it is possible to reduce the cost, it is economical and the construction is simple, so it is possible to shorten the air and install it with high precision.

5 is a perspective view showing a state in which a reinforcement is installed to connect the PHC pile and the basement slab to reinforce the intermediate layer rim beam to transfer the load transferred from the basement slab to the PHC pile and the basement outer wall is fixed to the PHC pile.

As shown in FIG. 1 (e), an intermediate layer border beam 45 is formed between the basement floor 50 and the PHC pile, and the load transferred from the basement layer slab 50 through the intermediate layer border beam 45 is PHC pile. And to the basement outer wall 40.

As shown in FIG. 5, the reinforcement 45a constituting the interlayer edge beam according to the present invention is perpendicular to each other with respect to the pair of base plates 451a and 451b and the base plates 451a and 451b. It includes a plurality of abdominal reinforcement (452), the upper reinforcement (453) and a pair of intermediate reinforcement (454a) (454b) for connecting the abdominal reinforcement (452) to be installed at intervals. That is, the configuration of the reinforcement (45a) to reinforce the intermediate layer rim beam is the same as the configuration of the reinforcement (20a) to reinforce the stress transmission beam 20, except for the vertical reinforcement and spiral reinforcement to the component having the same function The same terms are used and only the reference numerals are used for differentiation.

The pair of base plates 451a and 451b are each composed of a strip-shaped steel sheet having a constant thickness as a whole and a length longer than the width thereof, and they are formed on the front surface of the PHC pile 11 (the surface on which the ground is excavated). The piles 11 are arranged in parallel to be spaced apart from each other in a direction crossing the piles 11. Since the PHC pile 11 is manufactured by centrifugal molding of high-strength concrete, it is difficult to fix the abdominal reinforcement 452 on the front surface of the PHC pile 11. The base plates 451a and 451b provide a surface on which the abdominal reinforcement 452 can be welded. The base plates 451a and 451b are drilled into the PHC pile 11 at a position corresponding to the position where the basement slab is to be installed using a drill, and then the bolts penetrate the base plates 451a and 451b to be fastened to the holes. It can be fixed in a way. Alternatively, the manufacture of the PHC pile 11 may be fixed by inserting the insert nut in advance and fixing the bolt to the insert nut and welding the base plates 451a and 451b to the bolt. Therefore, one side (back side) of the base plates 451a and 451b is in contact with the PHC pile 11 and the abdominal reinforcement 452 is fixed to the other side (front side).

A plurality of abdominal reinforcing bars 452 are welded to the front surfaces of the base plates 451a and 451b at regular intervals along the longitudinal direction of the base plates 451a and 451b perpendicular to the surface. Abdominal reinforcement 452 is bent in a substantially c-shaped shape and has a leg portion 4522 extending horizontally at each end. The abdominal reinforcement 452 may be bent in a rod-like member in multiple stages to form the leg portion 4522 and the c-shaped portion (4521) integrally. The leg portion 4522 may be bent to be retracted inwardly or spread outwardly and welded to the front surface of the base plates 451a and 451b. When bent to cut inward, the vertical portion 4451a of the c-shaped portion 4451 becomes a shape extending vertically from the end in the width direction of the base plates 451a and 451b so that a larger cross section of virtual concrete can be formed. Thus, the interlayer rim beam can have a greater load capacity and the transfer of stress at the junction of the interlayer rim beam and the PHC pile becomes more certain.

The upper reinforcement 453 is installed to connect the upper part of the abdominal reinforcement 452 (the length protruding from the base plate is called the height of the abdominal reinforcement and the highest part is called the upper part) and the intermediate reinforcement 454a to connect the middle part. 454b is installed.

The upper reinforcement 453 is composed of at least two or more and is installed in parallel to the base plate (451a) (451b) to connect the horizontal portion (4521b) of the abdominal reinforcement (452). In the drawing, the lower part of the horizontal portion 4451b of the abdominal reinforcement 452 of the two upper reinforcement 453 was welded in parallel to the base plates 451a and 451b, but the number of the upper reinforcement 453 is not limited thereto. Of course, the installation position can also be installed above the horizontal portion (4521b).

The intermediate reinforcing bars 454a and 454b are formed in at least two pairs and are installed in parallel to the upper reinforcement 453 so as to connect the vertical portions 4451a of the abdominal reinforcing bars 452 to each other. In the drawing, two pairs of intermediate reinforcing bars 454a and 454b were welded in parallel to the upper reinforcing bars 453 inside the vertical portion 4451a of the abdominal reinforcing bars 452. Is not limited thereto, and the installation position may also be installed outside the vertical portion 4251a.

When the reinforcement 45a for reinforcing the intermediate layer rim beam 45 configured as described above is fixed to the PHC pile, and the formwork for placing the basement slab and the basement outer wall concrete is installed and then the concrete is poured, the intermediate layer as shown in FIG. 1 (e). Rim beam 45, basement slab 50 and basement outer wall 40 are integrally constructed so that the load transmitted from basement slab 50 is transmitted to PHC pile and basement outer wall 40 through middle layer rim beam 45. do.

6 is a cross-sectional view schematically showing a building basement structure constructed in accordance with the present invention.

As shown in FIG. 6, in the building basement structure constructed in accordance with the present invention, the PHC pile 11 constituting the retaining wall is integrally synthesized through the basement outer wall 40 and the shear connection material 41 and transmitted from the ground layer structure. It serves as a basis for delivering to the ground. Therefore, according to the present invention, the load transmitted from the ground layer structure is a vertical member (70, column or wall) of the ground layer structure-> stress transmission beam 20-> PHC pile 11 + underground layer outer wall 40- > Transferred to ground. At this time, the stress transmission beam 20 is connected to the upper end of the PHC pile 11 so as to be integral to the side pressure and at the same time transfer the load through the vertical member 70, such as pillars or walls of the ground layer structure PHC pile ( 11) and a function (transmitted as a kind of stem or continuous basis), the shear connector 41 installed on the outer surface of the PHC pile 11 is a basement outer wall by synthesizing the PHC pile 11 and the basement outer wall 40 The 40 is to share the load transmitted through the vertical member 70 of the ground layer structure together with the PHC pile 11, and the bracket formed on the lower surface of the foundation bottom of the contact portion of the foundation floor 30 and the basement outer wall 40 The part 31 serves to widen the tip area of the basement outer wall 40 to share the load transmitted through the vertical member 70 of the ground layer structure together with the PHC pile 11 and transmit it to the ground. PHC pile and supported by hard supporting ground Unlike the tip of the basement outer wall may lack the support force bracket portion 31 is to reinforce the tip support of the basement outer wall that may be lacking by expanding the tip area.

Therefore, according to the present invention, it is possible to install a wall or column of the ground layer on the upper part of the stress transmission beam, and thus, unlike the conventional art, it is possible to construct a column or wall of the basement outer wall and the ground layer as close as possible to the boundary of the ground, so that the use of the site is high and the construction of the plywood is performed. The thickness of the wall can be reduced, so it is economical and the construction is simple, so it is possible to shorten the air and make the construction more accurate.

7 is a view schematically showing a process of constructing a building basement structure according to another embodiment of the present invention.

According to another embodiment of the present invention, a method for constructing a basement structure of a building using a barrier wall composed of PHC piles is a method of constructing a barrier layer in a method of constructing a basement structure sequentially from the ground floor down to the ground while performing excavation (Top-down method). Construction of the foundation, slab construction of the PHC pile head and stress transfer beam, construction of the ground layer slab after the excavation of the first stage, construction of the first floor slab and the exterior wall after the excavation of the second stage, construction of the foundation slab after the excavation and construction of the basement slab / outer wall after the excavation It is composed. That is, the present embodiment is different from the embodiment shown in Figure 1 in that the excavation is repeated while constructing the slab of the basement layer from the ground floor sequentially from the ground floor, the construction of the retaining wall, PHC pile head clearance and stress transmission beam construction , Ground layer slab construction, excavation, basement slab and plywood construction, foundation slab construction are all constructed in the same way as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention . The invention is not limited by these variations and modifications, but is only limited by the scope of the appended claims.

10: retaining wall
11: PHC file
20: stress transfer beam
20a: Reinforcement of stress transfer beam
30: foundation slab
31: Bracket part
40: basement outer wall
41: shear connector
42: welded wire mesh
45: mezzanine border beam
45a: Reinforcement of the middle rim beam
50: basement slab
60: ground floor slab

Claims (5)

Install PHC piles in a line along the land boundary to construct the earth wall.
After arranging the heads of the PHC piles, construct the stress transmission beams connecting the heads of the PHC piles arranged in a line.
Excavate to the lowest level while supporting the retaining wall,
Install the foundation slab on the bottom of the excavated bottom layer,
In the method of completing the basement structure of the building by repeating the steps of constructing the basement outer wall and basement slab, and then the ground floor slab,
Stress transmission seeing,
Insert a cylindrical rebar network formed by fixing a plurality of vertical reinforcement (16) with a spiral reinforcement (17) into the hollow of each PHC pile (11),
A plurality of abdominal reinforcing bars 12 are projected vertically with respect to the base plates 11a and 11b at regular intervals along the longitudinal direction of the pair of base plates 11a and 11b spaced apart from each other. Base plate 11a (11b) and a pair of intermediate reinforcing bars (14a) and (14b) for coupling the upper reinforcement 13 and the middle portion of the abdominal reinforcement (12) to each other and to connect the upper portion of the abdominal reinforcement (12) Fixed in parallel to the base plate (11a) (11b) is placed on the upper surface in the direction crossing the PHC piles and then fixed the vertical reinforcement (16) to the abdominal reinforcement (12),
A method of constructing a basement structure of a building using a retaining wall composed of PHC piles after the formwork is installed so that concrete is filled into the hollow of the PHC pile. The method according to claim 1,
Connect the basement slab to the PHC pile using the middle layer border beam,
Mezzanine border beams,
A plurality of abdominal reinforcing bars 452 are formed to protrude perpendicularly to the base plates 451a and 451b at a predetermined distance along the longitudinal direction of the pair of base plates 451a and 451b spaced apart from each other. Base plate (11a) (11b) and a pair of intermediate reinforcing bars (454a) (454b) for coupling and connecting the upper portion of the abdominal reinforcement (452) to the upper bar (453) and the middle portion of the abdominal reinforcement (452) After fixing in parallel to the base) and fixing the base plate (451a, 451b) in the direction across the PHC pile so that the abdominal reinforcement (452) protrudes vertically toward the excavation surface,
A method of constructing a basement structure of a building using a retaining wall composed of PHC piles after the formwork is installed and integrated with the basement outer wall and the basement slab concrete. The method according to claim 1,
A plurality of shear connection members 41 are fixed to the outer surface of the PHC pile 11 at regular intervals along the longitudinal direction, metallases 42 are installed, and the base layer outer concrete is poured to synthesize the PHC pile and the basement outer wall integrally. Construction method of the basement structure of the building using the earthen wall consisting of PHC pile, characterized in that to make. The method according to claim 1,
The lower surface of the foundation slab 30 where the foundation slab 30 and the basement outer wall 40 are in contact with each other, compared to other parts of the foundation slab 30 so that the load transmitted through the basement outer wall 40 is evenly transmitted to the ground. The construction method of the building basement floor structure using the earthquake wall consisting of PHC pile, characterized in that the large dance portion 31 is formed. The method according to claim 1,
On the outer circumferential surface of the PHC pile 11 has a predetermined eccentric distance e to the rear with respect to the center line (CL) passing through the center of the cross section, and the soil barrier consisting of a PHC pile characterized in that a pair of order grouting groove 111 is formed Construction method of building basement structure using walls.

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