KR100960603B1 - Construction method of retaining wall using phc pile - Google Patents

Abstract

PURPOSE: An underground composition wall construction method using a retaining wall composed of PHC piles is provided to carry out simple and minute construction by reducing the thickness of a wall. CONSTITUTION: An underground composition wall construction method using a retaining wall composed of PHC piles(11) comprises following steps. The ground is bored along a ground boundary line and a PHC pile is inserted to form a retaining wall. A connecting bar fixing unit is welded after arranging the head of a PHC pile and inserting a connecting bar. The head of the PHC piles is connected by digging the ground at fixed depth, a reinforcing bar is arranged, a cap beam is formed, a mold is installed, and then concrete is poured.

Description

Construction method of retaining wall using PHC pile}

The present invention relates to an underground plywood that is constructed so that the basement outer wall of a building is integrated with an earthquake wall. In particular, it is possible to construct a column or wall of the basement outer wall and the ground floor as close to the land boundary as possible, and at the same time, to increase the thickness of the wall when constructing the plywood wall. The present invention relates to a construction method of underground plywood wall using a retaining wall composed of PHC piles.

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 400 mm of working space. Therefore, 550 + 400 = 950 mm 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.

Figure 6 is a cross-sectional view showing the construction of the retaining wall by the CIP method and the construction of the outer wall of the basement floor as a combined wall.

As shown in FIG. 6 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 poured into 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 be able to construct the basement outer wall and the ground floor column or wall as close as possible to the boundary of the land line, the use of the land is high and the wall thickness can be reduced when constructing the plywood, economical and simple construction The present invention provides a construction method for underground plywood walls using an earthquake wall composed of PHC piles, which allows for shortening of air and high precision construction.

According to a preferred embodiment of the present invention, the method comprises the steps of: (a) perforating the ground along the land boundary, inserting and finally struck the PHC pile to form a barrier wall composed of PHC piles in the ground; (b) constructing an internal column that is a pillar of the structure while supporting the brace and according to the plan; (c) arranging the head of each PHC pile and inserting the connecting bar to be exposed to the hollow of the PHC pile and then joining the connecting bar fixing means to the connecting bar to fix the installation position of the connecting bar; (d) After being dug to a certain depth, connecting the heads of each PHC pile, reinforcing the reinforcing bars for the formation of the cap beams on which the ground column pillars or walls are erected, and installing the formwork, and then hollowing the cap beam concrete and each PHC pile Pouring concrete at the same time filling the; (e) jutting to a predetermined depth of depth, then repeating the process of installing a brace to connect the girdle and the inner pillar to support the retaining wall, and gulting until the planned dig is reached; (f) installing a plurality of shear connectors on the outer surface of the PHC pile corresponding to the lowermost floor, fixing the metal lath, and then laying the foundation floor concrete and laying the lowermost outer wall concrete to construct the lowermost plywood; (g) After removing the strips and braces of the layer corresponding to the bottom layer +1, install a plurality of shear connectors on the outer surface of the PHC pile, fix the metal lath, cast the floor concrete of the floor, and cast the outer wall concrete of the floor. Repeating the process of constructing the laminated wall to the ground layer-1 layer; And (h) pouring the ground floor concrete; wherein, in step (f), the bottom of the bottom of the part where the foundation floor and the wall contact each other has a load transferred through the wall of the foundation to equally transfer the ground to the ground. Underground plywood construction method using a retaining wall consisting of a PHC pile, characterized in that to form a larger bracket than the other parts of the dance is provided.

According to another suitable embodiment of the present invention, the PHC pile is formed with a pair of order grouting grooves facing each other so that injection holes can be formed by neighboring PHC piles. It has a predetermined eccentric distance to the rear of the center line passing through, and further comprising the step of performing grouting for the degree in the order grouting groove after step (a).

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According to another suitable embodiment of the present invention, in step (g), an intermediate layer border beam is formed between the bottom of the layer and the plywood.

According to the construction method of underground plywood wall using PHC pile according to the present invention, it is possible to construct pillars or walls of the basement outer wall and ground layer as close as possible to the boundary of the land, so that the use of the land is high and the thickness of the wall when the plywood is constructed Economical and simple construction is possible because it can be reduced, so it is possible to shorten the air and high precision construction.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components or parts are denoted by the same reference numerals as much as possible, and detailed descriptions of related known functions or configurations are omitted.

1 is a view for explaining the construction step of the earthquake wall construction of the underground plywood construction method using the earthquake wall consisting of PHC pile according to the present invention, Figure 2 is a cross-sectional view showing the configuration of the underground plywood constructed in accordance with the present invention, Figure 3 is a cross-sectional view showing the joint structure of the head of the PHC pile, the cap beam and the bottom of the vapor phase layer.

Underground pavement construction method using the earthquake wall consisting of PHC pile according to the present invention, the construction of the earthquake wall construction step, internal column construction step, PHC pile head cleaning step, cap beam construction step, gulting step, foundation floor and bottom layer construction wall construction step, And ground floor floor construction step after repeating the construction of the plywood wall. Various methods are known as the method of supporting the retaining wall while resisting the 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 supporting method and the excavation method of the retaining wall will be described within the range 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.

(a) Block wall construction stage

Perforating the ground along the ground boundary line and repeating the step of inserting and final strike the PHC pile (11) to form a barrier wall consisting of PHC pile in the ground. 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. In the present invention, as shown in Figure 1, PHC pile 11 having a pair of order grouting groove 111 is formed on the outer peripheral surface with a predetermined eccentric distance e rearward with respect to the center line (cl) passing through the center of the cross section ). Thus, by forming a pair of order grouting groove 111 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 installed 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. As the injection method of the grouting agent (chemical solution), a known LW method, SGR method, JSP method, etc. may be selectively applied. In addition, in the related art, the diameter of the drilling hole needs to be drilled about 10 cm larger than the diameter of the pile. However, in the present invention, the diameter of the drilling hole can be made much smaller, so that the construction of the PHC pile 11 as close as possible to the ground boundary line is possible.

(b) Internal column construction stage

At the same time, support the brace and construct the inner pillar which becomes the pillar of the structure according to the plan. 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.

(c) PHC file tofu cleanup step

After arranging the head of each PHC pile, the connecting bar 21 and the connecting bar fixing means 22 for synthesizing the head of the PHC pile and the cap beam and the ground layer wall or column to be built on the cap beam can be integrated. Install). Referring to FIG. 3, after arranging the head of each PHC pile 11, the connecting bar 21 is inserted to be exposed to the hollow of the PHC pile 11, and then the connecting bar fixing means 22 is connected to the connecting bar 21. To fix the installation position of the connecting bar (21). The connecting bar 21 is for the PHC pile 11 and the cap beam 20 and the ground layer wall or the pillar 30 installed on the cap beam 20 to be integrated with each other. Inserted into the hollow and the other end is installed to be exposed to the top of the cap beam (20). And the ground layer wall or pillar 30 and the cap beam 20 which is installed on the cap beam 20 by the exposed connecting bar 11 is synthesized integrally. The connection bar fixing means 22 is for fixing the connection bar 21 temporarily, the angle can be used and is fixed to the seat plate of the upper PHC pile (11).

(d) Cap beam construction stage

After digging to a certain depth and connecting the head of each PHC pile (11) after laying the reinforcing bar (23) for forming the cap beam 20, which is the foundation on which the ground floor column or wall (30) is erected and the formwork is installed The cap beam concrete and the concrete filling the hollow of each PHC pile 11 are poured at the same time. The tip of the PHC pile 11 is driven to a depth capable of exerting sufficient supporting force by the final strike. As the heads of the PHC pile 11 are connected to each other by the cap beam 20, the PHC pile is connected to the side pressure such as earth pressure or hydraulic pressure. Allow the piles 11 to resist integrally. In addition, the PHC pile 11 functions as an outer wall of the basement layer of the present structure as well as a barrier wall to prevent the collapse and relaxation of the soil during the excavation, thereby increasing the strength and rigidity by filling concrete therein. On the other hand, the lower end of the cap beam 20 is formed to have a step so that the upper end of the basement outer wall 40 to be constructed later is higher than the upper end of the PHC pile 11.

(e) Gulto stage

After excavating to a predetermined depth of planning, repeat the process of installing a brace that connects the girdle and the inner column to support the retaining wall and til until the planned excavation is reached. As a method for supporting the soil wall at the time of gulting, a strut method for supporting the soil wall composed of the H pile-earth plate may be used, and may be arbitrarily selected from known methods.

(f) Foundation floor and lowest plywood construction

After the excavation is completed until the planned excavation height, a plurality of shear connecting members 411 are fixed to the outer surface of the PHC pile 11 corresponding to the lowest layer and the metal lath 412 is installed. Then, the foundation floor 50 is poured concrete and the lowermost outer wall 41 concrete is poured to construct the lowest plywood wall. Shear connector 411 can be applied to the stud known to resist the in-plane shear force between the PHC pile (11) and the basement outer wall concrete can be synthesized and behave integrally. You can apply the method of inserting and fixing the stud after making a hole in 11). The metal lath 412 is installed for the purpose of suppressing cracking as well as improving adhesion and strength of the basement outer wall concrete.

(g) plywood construction repetition

After the lowermost plywood is constructed, the strips and braces of the upper layer, that is, the lowermost layer + the first layer, are removed, and a plurality of shear connectors 411 are formed on the outer surface of the PHC pile 11 as in the above step (f). After installing and fixing the metal las 412, the layer floor concrete 60 is poured, and the layer outer wall 40 + n concrete is poured to construct the layered wall to the ground layer-1 layer.

(h) Ground floor floor construction stage

Finally, the ground layer bottom 70 is constructed, and the bottom layer 70 end of the ground layer is integrally connected to the pre-constructed cap beam 20. To this end, when the cap beam 20 is constructed, the rebar of the cap beam 20 is exposed to be connected to the ground floor bottom reinforcement 71 in advance. Alternatively, the construction of the ground floor bottom 70 may be simultaneously performed for the construction of the cap beam 20. In this case, the ground floor bottom reinforcing bar 71 is embedded into the cap beam 20 and the end is bent and fixed.

As described above, in the present invention, since the ground wall or the pillar of the ground layer may be installed on the upper part of the cap beam, the basement outer wall and the ground or the pillar of the ground layer may be constructed as close as possible to the boundary of the ground, so that the use of the earth is high. When the plywood is constructed, the thickness of the wall can be reduced, so it is economical and the construction is simple. Therefore, the air shortening and high precision construction are possible.

4 is a cross-sectional view showing the junction structure of the base (lowest floor) floor concrete and the plywood wall, Figure 5 is a cross-sectional view showing the junction structure of the middle layer (lowest layer + n layer) floor and the plywood wall.

Referring to FIG. 4, the lower surface of the base bottom 50 of the portion where the base bottom 50 and the lowermost outer wall 41 are in contact with each other is compared with other parts of the base bottom so that the load transmitted through the plywood is evenly transmitted to the ground. This large bracket portion 51 is formed. That is, the load transmitted from the ground layer structure is transferred to the ground through the PHC pile 11 and the basement outer wall 40 which is constructed integrally with the PHC pile 11, and the PHC pile 11 is supported by the solid ground to have sufficient bearing capacity. On the other hand, in the case of the basement outer wall 40, the bearing capacity is insufficient compared to the PHC pile 11, although it is synthesized by the shear connector 411, PHC pile 11 and the displacement may be different. Therefore, in the present invention, by forming a bracket portion 51 having a larger dance than the other portion of the bottom of the foundation bottom of the portion where the foundation bottom 50 and the lowermost outer wall 41 contact each other, the rigidity is increased and the outer circumferential surface of the PHC pile 11 is provided. A plurality of shear connectors 411 and connecting loop reinforcing bars 511 bonded to the upper surface of the basement layer 40 and the base floor 50, the slip is not generated at the interface is synthesized integrally.

As shown in FIG. 5, an intermediate layer border beam 61 is formed between the floor bottom 60 and the outer wall 40 + n. The middle layer rim beam 61 synthesizes the PHC pile 11 and the layer bottom 60 integrally through a plurality of shear connecting members 411 and connecting loop reinforcing bars 511 bonded to the outer circumferential surface of the PHC pile 11. .

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. Can be done.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.

1 is a view for explaining the step of constructing the retaining wall of the underground plywood construction method using the retaining wall consisting of PHC pile according to the present invention.

Figure 2 is a cross-sectional view showing the configuration of the underground plywood constructed in accordance with the present invention.

3 is a cross-sectional view showing the joint structure of the head of the PHC pile, the cap beam and the bottom of the vapor phase layer.

Figure 4 is a cross-sectional view showing the junction structure of the base (lowest layer) floor concrete and the plywood.

5 is a cross-sectional view showing the junction structure between the bottom of the intermediate layer (lower layer + n layer) and the plywood wall.

Figure 6 is a cross-sectional view showing the construction of the retaining wall by the CIP method and the construction of the outer wall of the basement floor as a combined wall.

Claims (4)

(a) repeating the steps of perforating the ground along the land boundary, inserting and finally struck the PHC file to form a retaining wall composed of PHC piles in the ground; (b) constructing an internal column that is a pillar of the structure while supporting the brace and according to the plan; (c) arranging the head of each PHC pile and inserting the connecting bar to be exposed to the hollow of the PHC pile and then joining the connecting bar fixing means to the connecting bar to fix the installation position of the connecting bar; (d) After being dug to a certain depth, connecting the heads of each PHC pile, reinforcing the reinforcing bars for the formation of the cap beams on which the ground column pillars or walls are erected, and installing the formwork, and then hollowing the cap beam concrete and each PHC pile Pouring concrete at the same time filling the; (e) jutting to a predetermined depth of depth, then repeating the process of installing a brace to connect the girdle and the inner pillar to support the retaining wall, and gulting until the planned dig is reached; (f) installing a plurality of shear connectors on the outer surface of the PHC pile corresponding to the lowermost floor, fixing the metal lath, and then laying the foundation floor concrete and laying the lowermost outer wall concrete to construct the lowermost plywood; (g) After removing the strips and braces of the layer corresponding to the bottom layer +1, install a plurality of shear connectors on the outer surface of the PHC pile, fix the metal lath, cast the floor concrete of the floor, and cast the outer wall concrete of the floor. Repeating the process of constructing the laminated wall to the ground layer-1 layer; And (h) pouring ground floor concrete; In the step (f), the base bottom and the bottom wall of the portion where the wall is in contact, characterized in that the bracket portion is danced larger than the other parts of the foundation floor so that the load transmitted through the wall is evenly transmitted to the ground Underground pavement construction method using soil wall consisting of PHC pile. According to claim 1, The PHC pile has a pair of order grouting grooves facing each other so that injection holes can be formed by neighboring PHC piles, and the order grouting grooves have a predetermined eccentricity toward the centerline passing through the center of the cross section on the outer peripheral surface. Has a distance, After the step (a), the underground grout construction method using the earth retaining wall consisting of PHC pile, characterized in that further comprising the step of grouting for the order in the order grouting groove. delete According to claim 1, In step (g), the basement plywood construction method using the earth barrier wall consisting of PHC pile, characterized in that the intermediate layer rim beam is formed between the floor and the plywood wall.

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