KR101288831B1 - Remodeling construction method using micropile and truss in a surrounding structure and the places that it is adjacent to - Google Patents

Abstract

In the present invention, the wall-replacement building remodeling method using the small-diameter pile and the load transfer frame is based on the limited load-transfer frame that transfers the load of the new column constructed close to the zone wall to the small-diameter pile arranged in a line and minimizes the eccentricity. It is installed within the dance and the width of the building, and a buffer pad is installed under the new foundation to control the deflection due to the change in the working load between the foundation wall and the new foundation, and the settlement of the new extension building is completed. The post wall and the new column are combined with the Delay Joint, so that the upper loads transmitted through the columns in the narrow space can be effectively transmitted to the multiple rows of pile foundations in the lower part. It does not bear the load added to the structure and can be installed near the basic structure and surrounding structures Because while the fire preservation value of maintaining good wall or building upon existing wall remodeling can be constructed without damaging the wall or walls is an excellent workability, and is very valuable economic effect.

Description

Remodeling construction method using micropile and truss in a surrounding structure and the places that it is adjacent to}

The present invention relates to a method of remodeling a wall-bearing building using a small-diameter pile and a load transfer frame, and more specifically, to separate and load a new structure while expanding and expanding a building as close as possible in the presence of an exterior wall of historical value. It is a remodeling method that can maximize the use of planned space and ensure the stability by forming the foundation.The load that transfers the load of the new column constructed close to the zone wall with the small-diameter pile arranged in line is minimized the eccentricity and is transmitted evenly. The transition frame is installed within the dance and the width of the limited foundation, and a buffer pad is installed below the new foundation to control the absorption of the sag caused by the change of the upper load between the existing foundation and the new foundation. After the settlement of the new extension building by the fixed load, the wall and the new column Delay Joi The present invention relates to a wall-replacement building remodeling method using small-diameter piles and load transfer frames coupled to nt.

The outer wall of the existing building was preserved and the interior was renovated and the interior was renovated by installing a separate support frame for the self-reliance of the wall. In this way, the exterior has the same cultural value as some walls of the existing building. In the case of preservation, extension or renovation, it is difficult to overcome various structural problems due to the independence of the wall, the fixed load of the new part, and the new load of the loaded part. There was a problem.

In addition, the remodeling work in the existing state of the wall is using a support frame that is frequently used in the existing remodeling method, so that the work is spaced apart from a certain space between the preservation wall (structure) and the new structure, which causes spatial loss. As a result, the cost loss due to the decrease of the lease area was very large.

The present invention is to solve the above problems, the remodeling method to expand and expand the building as close as possible in the state of retaining the outer wall of historical value, the load of the new column constructed in close proximity to the zone wall Load transfer frame that minimizes eccentricity and distributes evenly with small diameter piles is installed within the limited dance and width of foundation, and buffer pad controls the deflection caused by the change of working load between foundation and new foundation. It is installed under the new foundation, and provides the wall renovation construction method using small-diameter piles and load transition frames that are combined with the zone wall and the new column Delay Joint after the settlement of the fixed load of the new extension building is completed. There is this.

The present invention is an existing structure demolition step of demolishing the internal structure while leaving the existing wall of the existing structure; A through-hole drilling step of forming a groove by blocking out the existing foundation of the zone wall and drilling a plurality of through-holes in a line in the groove; A small diameter pile installation step of pressing and installing a small diameter pile into the perforated through hole, cutting the upper end, and then installing a cap plate at the upper end of the small diameter pile; A load transfer frame installation step of installing a load transfer frame made of steel on the upper portion of the small diameter pile so as to distribute the load of the upper portion evenly to the plurality of small diameter piles arranged in a row; A buffer pad installation step of constructing a buffer pad between a lower surface of a cap plate of a small diameter pile and an upper surface of an existing foundation, and installing a separator on the side of the existing foundation; A new foundation forming step of forming a new foundation by assembling reinforcing bars in the groove and placing concrete; Steel pillar installation step of installing a steel pillar on the upper portion of the load transfer frame; A new structure installation step of installing a new column by constructing a delay joint for dropping the space between the zone wall and the new column by a predetermined distance, and installing the new structure by placing boconcrete; After the settlement of the new structure is completed, the concrete joining step of placing the concrete on the delay joint to combine the existing wall and the new pillar; To provide a wall reconstruction structure renovation method using small diameter pile and load transition frame characterized in that consisting of do.

In addition, the buffer pad is composed of a natural rubber plate or a high damping rubber plate, to provide a wall reconstructed building renovation method using a small diameter pile and a load transition frame characterized in that the steel plate is installed at a predetermined interval therein.

In addition, the small diameter pile installation step provides a wall pre-construction building remodeling method using a small diameter pile and a load transfer frame, characterized in that the sleeve pipe formed of a synthetic resin pipe or steel pipe in the through-hole and press-fitted the small diameter pile. I would like to.

In addition, the load transfer frame is the wall plate using a small diameter pile and load transfer frame, characterized in that consisting of a plurality of braces installed between the upper plate, the lower plate configured at the bottom, the upper plate and the lower plate configured at the top To provide a building remodeling method.

Wall relocation building renovation method using small diameter pile and load transfer frame of the present invention uses a load transition frame to evenly transfer the load of the new column adjacent to the zone wall to the small diameter pile arranged in a row. Efficiently transmits the upper load transmitted through the multiple rows of pile foundations in the lower part so that the stretched part does not bear the load added to the existing wall and the existing foundation, and can be installed near the foundation and surrounding structures. As the building is constructed and expanded as close as possible to the exterior wall, the foundation can be formed by separating the load of the newly constructed structure to form the foundation, thereby maximizing the use of planned space and securing stability.

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 cross-sectional view schematically showing the installation state of the wall existing building remodeling method using a small diameter pile and load transfer frame of the present invention,
2 is an enlarged partial view of FIG.
3 is an explanatory view schematically showing the procedure of the wall-standing building remodeling method using a small diameter pile and a load transition frame of the present invention,
3A is an explanatory diagram of an existing structure removal step;
Figure 3b is a through hole drilling step explanatory diagram,
Figure 3c is a small diameter pile installation step explanatory diagram,
Figure 3d is a diagram illustrating the load transition frame installation step,
Figure 3e is a diagram illustrating the buffer pad installation step,
3f is an explanatory diagram of a new basic formation step;
Figure 3g is an illustration of the steel pillar installation step,
Figure 3h is an explanatory diagram of the installation step of the new structure,
3i is an explanatory diagram of the structure coupling step;
4 is a view showing an installation state of the load transfer frame of the present invention,
5 is a view showing an embodiment of a load transition frame formed of four points and five points,
6 is an explanatory diagram showing a schematic load transition flow of a load transfer frame in which four points and five points are formed;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

 Hereinafter, the technical structure of the present invention will be described in detail with reference to the preferred embodiments.

Wall retaining building remodeling method using a small diameter pile and load transfer frame of the present invention is to install the self-supporting truss (11) on the outer wall leaving the retaining wall (10) of the existing structure and the existing structure demolition step ( S1); A through-hole drilling step (S2) for forming a groove 22 by blocking out the existing foundation 20 of the zone wall 10 and drilling a plurality of through-holes 21 having a predetermined interval in the groove 22 in a line. ; Small diameter pile installation step (S3) for pressing and installing the small diameter pile 200 in the perforated through-hole 21 and cutting the upper end, and then installing the cap plate 210 on the upper end of the small diameter pile 200; Load transition frame installation step (S4) to install a load transfer frame 300 made of steel to the top of the small diameter pile 200 to distribute the load of the upper portion evenly arranged in a plurality of small diameter pile 200 in a row ; The buffer pad 100 is formed between the lower surface of the cap plate 210 of the small diameter pile 200 and the upper surface of the existing foundation 20, and the separation membrane 23 is installed on the side surface of the existing foundation 20. Buffer pad installation step (S5); A new foundation forming step (S6) of assembling reinforcing bars in the grooves 22 and pouring concrete to form a new foundation 40; Steel pillar installation step (S7) for installing the steel pillars 31 on the upper portion of the load transfer frame (300); Install new structure to construct new joint 30 by constructing delay joint 400 to drop the space between the precipitous wall and the new pillar by a certain distance, and install new structure 60 by placing boconcrete 50 Step S8; After the settlement of the new structure (60) is completed, the concrete is poured into the delay joint (400) is characterized by consisting of a structural coupling step (S9) for coupling the zone wall 10 and the new column (30).

Existing structure demolition step (S1) is a step of dismantling the existing structure with the remaining wall 10 is left. The self-supporting truss 11 is installed on the outer wall of the zone wall 10 to demolish the internal structure to ensure structural stability.

The zonal wall 10 is zoned to remodel the building as close as possible in the state of retaining the exterior wall of historical value, and the new structure 60 is installed inside the zonal wall 10 by removing the internal structure. For that.

The preservation wall 10 which is preserved at the same time as the start of construction is supported by installing the self-supporting truss 11 on the outer wall, and is supported by being combined with the new structure 60 after the construction is completed.

The through hole drilling step (S2) blocks out the existing foundation 20 of the zone wall 10 to form a groove 22, and drills a plurality of through holes 21 at a predetermined interval in the groove 22. It's a step.

As shown in FIG. 1, the urban remodeling blocks out the existing foundation 20 to form the grooves 22 for the foundation reinforcement together with the interference with the existing foundation 20, wherein the existing foundation ( Since the width (L) and the dance (D) that can be used as the grooves 22 in 20) are limited, the small-diameter piles 200 are used in a row.

When constructed as close as possible to the zonal wall 10, the available space inside the structure is fully utilized, so that the space utilization is very high. However, if the proximity construction is not possible, the space utilization is low because a considerable portion of the available area cannot be utilized. If the small diameter pile 200 is multi-arranged in the existing foundation 20, since eccentricity is generated and stress is concentrated in a part, the small diameter pile is secured for economical pile design while ensuring structural stability. 200) in a row.

In order to form the small diameter pile 200, the groove 22 is formed in the existing foundation 20, and the through hole 21 is formed in advance in the place where the small diameter pile 200 of the portion in which the groove 22 is formed is disposed. Perforated in a row to be arranged so that the small diameter pile 200 in a row.

Small diameter pile installation step (S3) is installed by pressing the small diameter pile 200 in the perforated through-hole 21, cut the upper end and then install the cap plate 210 on the upper end of the small diameter pile 200 Step.

Since the through holes 21 are arranged in a row on the existing foundation 20, the small-diameter piles 200 are also arranged in a row on the existing foundation 20.

In this way, the small diameter pile 200 is arranged in a line, the urban remodeling is limited to the width (L) and the dance (D) for the foundation reinforcement with interference with the existing foundation 20, and is constructed as close as possible to the existing building. Small diameter piles are arranged in a row to use.

When the small diameter pile 200 is multi-arranged in the existing foundation 20, since eccentricity is generated and stress is concentrated in a part, the small diameter pile 200 for economical pile design while ensuring structural stability. Are arranged in a line.

After inserting the small hole (200) into the through hole (21), the head is cut and the head is cut, and the head of the small diameter stake (200) is cleaned and the cap plate (210) is installed. do.

The load transition frame installation step (S4) is installed on the upper portion of the small diameter pile 200, the load transfer frame 300 made of steel to distribute the load of the upper portion evenly arranged in a plurality of small diameter pile 200 in a row It's a step.

Due to the space constraints, the small diameter pile 200 is arranged in a row. When the load of the new structure 60 is directly transmitted to the small diameter pile 200, the sizes are different so that the small diameter pile 200 can receive the load. Because it is impossible to properly utilize the ability of, the load transfer frame 300 that can be distributed evenly to the small diameter pile 200 receives the load from the new pillar 30 of the upper,

The load transfer frame 300 allows the load of the upper structure additionally generated on the small diameter pile 200 to act evenly on the small diameter pile 200 as the new pillar 30 is proximately installed on the wall 10. It is possible to use the pile of, and thus, for the even distribution of the load is necessary because the frame capable of transferring the load is configured.

In order to distribute the load evenly because the support load of the small diameter pile 200 is small, the load transition frame 300 may be configured to distribute the load evenly to the upper end of the plurality of small diameter pile 200 to the point. The load transition frame 300 is preferably configured in a truss shape.

For example, assuming that 200 tons of upper load is transferred to small diameter piles, assuming that the capacity of small diameter piles is 50 tons, the concentrated load without eccentricity is concentrated in the center and exceeds 50 tons of capacity of small diameter piles. To support the load concentrated in the center, pile capacity should be increased by exceeding the capacity of the pile, and small-diameter piles should be arranged in the less-loaded perimeter. In other words, if it is possible to distribute the load evenly, it is possible to have 4 tons of 50 tons by showing the maximum capacity for the load that can support each of the small-diameter piles. Since a quantity is required, it is disadvantageous in terms of construction period or economic feasibility, so that the load transition frame 300 is configured to transfer the load to the upper part of the plurality of small diameter piles 200.

When the load transfer frame 300 is installed on the small diameter pile 200, the center point of the load transfer frame 300 and the small diameter pile 200 is positioned at the correct position so as to coincide with the center point of the small diameter pile 200. Install it to match.

After the load transfer frame 300 is installed, the load transfer frame 300 should be fixed so as not to move by making the load transfer frame 300 coincide with the centering of the leveling and each point and the small diameter pile 200 by the vibration of the concrete placing and subsequent work. , Load transfer frame 300 is made of steel, so it is coupled to the small diameter pile 200 through a simple welding operation.

Buffer pad installation step (S5) comprises a buffer pad 100 between the lower surface of the cap plate 210 of the small diameter pile 200 and the upper surface of the existing foundation 20, the side of the existing foundation 20 In this step, the separator 23 is installed.

The buffer pad 100 is inserted between the lower surface of the cap plate 210 and the upper surface of the existing foundation 20 to prevent interference of the existing foundation 20 and the new structure.

When the cap plate 210 is installed at the upper end of the small diameter pile 200 in the small diameter pile installation step (S3), the lower surface of the cap plate 210 cannot be in close contact with the upper surface of the existing foundation 20 and is fixed. The cap plate 210 is spaced apart from the upper portion of the gap. Therefore, the buffer pad 100 is inserted between the lower surface of the cap plate 210 of the small diameter pile 200 and the upper surface of the existing foundation 20.
The zone wall 10 and the existing foundation 20 exist for a long time and are stabilized. When the load of the new column 30 is applied according to the reconstruction, problems may arise in the basic stability of the zone wall 10. In other words, if the ground bearing capacity is not secured, the settlement of the foundation will occur. Therefore, the new column 30 should be separated and constructed so as not to affect the existing foundation 20 of the precipitating wall 10, and the new foundation by fixed load should be completed only when the upper stretch structure 60 (not shown) is completed. Since ground stabilization is achieved, spaces between the existing foundation 20 and the new foundation 40 can be accommodated until the completion of the building to accommodate settlement of the ground caused by the new structure 60. Even if 40 is settled, the buffer pad 100 is installed so that the existing foundation 20 is not affected.

Buffer pad 100 for absorbing vertical displacement in consideration of the short-term settlement of small diameter piles resulting from the difference in working shaft load (load of new building during construction) between the lower surface of the new foundation 40 and the upper surface of the existing foundation 20 To install it.

At this time, the installation thickness of the buffer pad 100 is preferably configured to 1.5 times or more of the expected settlement amount.

The load that the new pillar 30 bears gradually increases according to the construction state of the internal structure in the state where the zonal wall 10 is outside. As the upper load increases, deflection occurs in the new column 30, and this deflection leads to the load transition frame 300. This means that if the cap plate 210 of the load transfer frame 300 and the small diameter pile 200 is in contact with the upper surface of the existing foundation 20, the deflection generated in the new structure 60 is loaded on the existing foundation 20. As a result, the behavior of the zone wall 10 and the existing foundation 20 may be unexpected. The load transfer that occurs before the construction of the new column 30 is completed and connected to the zone wall 10 may cause a performance limit of the existing foundation 20. That is, the settling of the new column 30 leads to the settling of the load transfer frame 300, and again exerts an additional force on the existing base 20, which may lead to abnormal behavior of the zoned wall 10.

Therefore, using the buffer pad (Buffer Pad) spaced between the cap plate 210 of the load transfer frame 300 and the small diameter pile 200 and the upper surface of the existing foundation 20 is a new structure 60 to be described later Even after deflection caused by the weight of the new structure 60 after formation, no load transfer to the existing foundation 20 occurs.

In addition, if the separation membrane 23 is provided on the side of the existing base 20, after the formation of the new foundation 40 to be described later, the load of the new foundation 40 prevents the transfer of load to the existing foundation 20 of the upper portion. The separation membrane 23 is installed perpendicular to the side of the existing foundation 20, that is, the side of the block-out groove 22 of the existing foundation 20.

Separation membrane 23 separates the existing foundation 20 and the new foundation 40, so as not to deliver the vertical load transferred to the new foundation 40 in the short-term settlement of the new structure 60 to the existing foundation 20. For that. The separation membrane 23 may use a vinyl membrane or a plate, or a mixture of the two.

New foundation forming step (S6) is a step of forming a new foundation 40 by assembling the reinforcing steel in the groove 22 and placing concrete.

The new foundation 40 installs the buffer pad 100, the small diameter pile 200, and the load transition frame 300 in the groove 22 formed by blocking out the existing foundation 20, and then reinforces the concrete. Pour it to form the foundation.

Steel pillar installation step (S7) is a step of installing the steel pillars 31 on the upper portion of the load transition frame (300).

Steel column 31 is a base for installing a new pillar 30, the steel pillar 31 is installed in order to install a new column on the vertical portion of the load transfer frame (300).

In the installation of the new structure (S8), the delay joint 400 is formed by dropping the space between the zone wall and the new pillar by a predetermined interval, and the new pillar 30 is poured, and the bocon concrete 50 is poured to build the new structure ( 60) step.

Delay joint refers to the site where the final concrete is poured after completion without leaving concrete for a certain period in order to exclude stress caused when the shrinkage and fixation of the concrete are different during construction.

When the anchorage wall 10 is directly connected to the new structure, the construction is to be carried out. When the stable ground of the existing foundation 20 and the additional fixed load of the new foundation 40 of the new structure are applied, the sedimentation is stabilized. At this time, the delay joint 400 is configured to attempt to connect the zone wall 10 and the new pillar 30.

The delay joint 400 constituting the delay joint 400 by dropping the space between the zone wall 10 and the new column 30 at a predetermined interval is different because the reaction force of the zone wall 10 and the new structure 60 is different. This is because if the newly constructed structure 60 and the residual wall 10 are connected together and behave as a single structure without forming the delay joint 400, short-term settlement of the newly constructed structure may cause damage to the residual wall 10. .

The section of the delay joint 400 may constitute a dowel bar 410 in the zone wall 10, or may comprise a reinforcing bar in the zone wall 10 and the new column 30.

Install the new column 30 to the steel column (31), install the beam 50 and the slab to construct a new structure (60), install a dowel bar (410) to the zone wall 10 do.

Structural coupling step (S9) is a step of combining the preliminary wall 10 and the new column 30 by placing concrete on the delay joint 400 after the settlement of the new structure 60 is completed.

In order to induce the behavior different from the new structure 60 by supporting the preliminary wall 10 to the external construction, and after the short-term settlement of the new structure 60 by the fixed load is completed in order to minimize the damage of the premise wall 10. The concrete is poured into the delay joint 400 between the zone wall 10 and the new column 30 to tightly connect the zone wall 10 and the new column 30.
Since one side of the existing foundation 20 is formed to block out the groove 22, and the new foundation 40 is formed in the groove 22, one side and the bottom surface of the new foundation 40 are existing foundations. It is in contact with the existing foundation 20 in the block-out groove 22 of (20). At this time, the lower surface of the new foundation 40 is supported by the small diameter pile 200, to prevent the load of the new foundation 40 from being transferred to the existing foundation 20, the new foundation 40 and the existing The side that the base 20 is in contact with each other prevents the load of the new foundation 40 from being transferred to the existing foundation 20 by the separator 23.

Therefore, when the new structure 60 is completed on the new foundation 40, the new foundation 40 is settled while the buffer pad 100 is compressed by the fixed load of the new structure 60.
As such, after the settlement of the new structure 60 is completed, the concrete is poured into the delay joint 400 to combine the zone wall 10 and the new pillar 30, and then grout the portion where the separator 23 is installed. Complete

In addition, the buffer pad 300 is composed of a natural rubber plate or a high damping rubber plate, it characterized in that the iron plate is installed at a predetermined interval therein.

The buffer pad consists of a natural rubber sheet or a high damping rubber sheet, and a thin steel plate is installed inside the natural rubber sheet or the high damping rubber sheet at regular intervals to control the displacement beyond the limit according to the load in the vertical direction at the site. Vertical displacement can be adjusted.

In addition, the small diameter pile installation step (S3) is characterized in that the through-hole 21 is installed by the sleeve tube 220 formed of a synthetic resin tube or steel pipe and press-fit the small diameter pile 200.

The sleeve (sleev) tube 220 is installed after drilling the through-hole 21 so that the small diameter pile 200 is introduced into the sleeve tube 220 to perfect the small diameter pile 200 and the existing foundation 20 To separate.

Between the sleeve tube 220 and the through-hole 21 is filled by mortar construction.

In addition, the load transfer frame 300 is the upper plate 310 configured at the top, the lower plate 320 configured at the bottom, a plurality of braces 330 installed between the upper plate 310 and the lower plate 320. It is characterized by a triangular truss shape consisting of a).

Since the new column 30 is close to the zone wall 10, the space of the existing foundation 20 is bound to be limited. A plurality of small-diameter piles 200 for transferring the upper loads transmitted from the new pillars 30 to the ground were arranged long in a row, and the space between the new pillars 30 and the existing foundations 20 is limited, so that the load transition frame The shape of the 300 is limited to a shape where the dance is small and the length is long compared to the width.

Therefore, the load transition frame 300 of the present invention, the upper plate 310 configured in the upper portion, the lower plate 320 configured in the lower portion, a plurality of braces installed between the upper plate 310 and the lower plate 320. It consists of a triangular truss (Triangle Truss) shape consisting of (330).

The brace 330 is formed by forming each point on the lower plate 320, the small diameter pile 200 abutting the load received from the upper plate 310 with the lower plate 320 under each point of the brace 330 It will be delivered evenly to the upper end of the).

As shown in FIG. 6, the distance between the points formed by the brace 330 of the lower plate 320 is constant at ℓ, so that the loads received from the upper plate 310 can be evenly transmitted to each point, respectively. Will be delivered to the small diameter pile 200 configured in the lower portion of each point.

Experimental Example

As shown in FIG. 6, the load transition frame 300 of the present invention includes an upper plate 310 configured at an upper portion, a lower plate 320 configured at a lower portion thereof, and an upper plate 310 and a lower plate 320 formed at an upper portion thereof. Experiments consisted of a plurality of braces 330 installed between them and composed of a triangular truss (Triangle Truss) shape having four points and five points.

1. Experimental conditions

When the upper load is 2,000 kN, the design load of one lower diameter pile foundation is 500 kN, which is designed as a four-point triangular truss. If the upper load is 2,500 kN, it was designed as a 5 point triangular truss. The four- and five-point load transition frames were analyzed only by the Half Model as a symmetric structure.

2. Result of experimental condition

(1) Three assumptions for four point load transition frame analysis

① Only half of the structure was analyzed in consideration of left and right symmetry, and the number of cross sections was limited to four.

② The cross section of element 4 (low chord) was limited to 250mmx40mm in consideration of the ease of joining the load transition frame and pile foundation because the diameter of the small diameter pile foundation set to 500 kN was Φ200. .

③ The thickness t of the member was limited to three types of 40 mm, 60 mm, and 80 mm in consideration of the workability of the steel sheet to be manufactured.

(2) 4 point load transfer frame section

① Derivation of relationship between fixed thickness (t ₁ , t ₂ , t ₃ ) and width (b ₁ , b ₂ , b ₃ )

(1), (2), (3) numbers are assigned randomly to upper parts except lower chords

All three members fix the thickness (t ₁ , t ₂ , t ₃ ) equally from 40 mm to 80 mm and derive the relational expression of the width (b ₁ , b ₂ , b ₃ )

Deriving a relation of b ₁ <b ₂ = b ₃ (b ₁ is 250mm or more)

Change in thickness (t) is required rather than width (b)

② Derivation of relationship between fixed width (b1, b2, b3) and thickness (t1, t2, t3)

Calculation of values of t ₁ = 40 mm and t ₂ = t ₃ = 80 mm

The calculated cross section was determined to be member 1: 150 mm × 0 mm, member 2: 150 mm × 80 mm, member 3: 150 mm × 80 mm, member 4: 250 mm × 40 mm.

Load sharing evenly at 4 points of error within 8% error range

(3) 5 point load transfer frame section

① Section 4 application

Member 1: 150 mm x 40 mm, Member 2: 150 mm x 40 mm, Member 3: 150 mm x 80 mm, Member 4: 150 mm x 80 mm, Member 5: 250 mm x 40 mm

② Change inclination of members 2 and 4

Assuming the inclination of the member 4 to 55 ° (on the connecting line of the center of the member 3 from the center of the lower chord)

Change inclination of member 2 between 90 ° and 70 °

■ Results: Even when the inclination of member 4 is 55 ° and the inclination of member 2 is 77 °, the load at 5 points can be equally distributed in the error range of about 8%.

Table 1 shows the member sections of the four and five points determined above.

(4) Analytical verification of the load transition frame.
Part number 4 points 5 points Width (b) Thickness (t) Width (b) Thickness (t) One 150 40 150 40 2 150 80 150 40 3 150 80 150 80 4 250 40 250 40 5 - - 250 40

■ Analysis using finite element analysis program

Four- and five-point transition frames were analyzed. Through the load control / displacement control for each model, the structural stability review and the distribution of reaction force values for the upper load were confirmed.

■ Measurement position of point reaction

Four rectangular 125x125x10 (mm) reaction plates with four cross-sections (four point transition frame) and five (five point transition frame) are installed at the bottom of each model to act as a small diameter pile foundation. The analysis was performed.

(5) Results

1,900kN and 2,400kN were applied to the upper points, and the reaction force values were measured to determine the even reaction force distribution.

Both models secured stability during site loading. From the structural behavior, both models were found to be in the elastic range with respect to the field load and the displacement was also small. Table 2 summarizes the results.

Analyze Analysis Model Stability Model Field load Yield load
(kN) Load
(kN) Field load
Yield Load Safety factor 4 points
Transition frame 1,900kN load
Elastic range
(stable) 2,640 3,600 0.72 28% 5 points
Transition frame 2,400kN load
Elastic range
(stable) 3,130 3,600 0.76 24%

As the load increases, the rate of increase of reaction force values in the center and both ends does not change, and the deflection of the reaction force at each point is small when the field load is applied. In case of the four-point transition frame, the reaction force deviation of the center and both ends is about 2%, and in the five-point transition frame, the reaction force deviation of the center and both ends is about 3%.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

10: Preservation Wall 20: Existing Foundation
21: through hole 22: groove
23: separator 30: new pillar
31: steel pillars 40: new foundation
50: bocon concrete 60: new structure
100: buffer pad 200: small diameter pile
210: cap plate 220: sleeve tube
300: load transition frame 310: upper plate
320: lower plate 330: brace
400: delay joint
S1: Demolition of existing structure S2: Drilling through hole
S3: Small diameter pile installation step
S4: Load transition frame installation step
S5: Buffer pad installation step S6: New basic formation step
S7: Installation stage of steel frame S8: Installation stage of new structure
S9: Structure combining step

Claims (4)

An existing structure demolition step (S1) of dismantling the internal structure while leaving the residual wall 10 of the existing structure;
A through-hole drilling step (S2) for forming a groove 22 by blocking out the existing foundation 20 of the zone wall 10 and drilling a plurality of through-holes 21 having a predetermined interval in the groove 22 in a line. ;
Small diameter pile installation step (S3) for pressing and installing the small diameter pile 200 in the perforated through-hole 21 and cutting the upper end, and then installing the cap plate 210 on the upper end of the small diameter pile 200;
Load transition frame installation step (S4) to install a load transfer frame 300 made of steel to the top of the small diameter pile 200 to distribute the load of the upper portion evenly arranged in a plurality of small diameter pile 200 in a row ;
The buffer pad 100 is formed between the lower surface of the cap plate 210 of the small diameter pile 200 and the upper surface of the existing foundation 20, and the separation membrane 23 is installed on the side surface of the existing foundation 20. Buffer pad installation step (S5);
A new foundation forming step (S6) of assembling reinforcing bars in the grooves 22 and pouring concrete to form a new foundation 40;
Steel pillar installation step (S7) for installing the steel pillars 31 on the upper portion of the load transfer frame (300);
Install new structure to construct new joint 30 by constructing delay joint 400 to drop the space between the precipitous wall and the new pillar by a certain distance, and install new structure 60 by placing boconcrete 50 Step S8;
After the submersion of the new structure 60 is completed, the concrete is poured into the delay joint 400, the structure coupling step (S9) for coupling the zone wall 10 and the new column 30; Small diameter consisting of Wall remodeling construction method using pile and load transfer frame. The method of claim 1,
The buffer pad 300 is composed of a natural rubber plate or a high attenuation rubber plate, the wall pre-existing building remodeling method using a small diameter pile and load transfer frame, characterized in that the steel plate is installed at a predetermined interval therein. The method of claim 1,
Small diameter pile installation step (S3) is a small diameter pile and load transfer, characterized in that by installing the sleeve tube 220 formed of a synthetic resin tube or steel pipe in the through-hole 21 and press-fit the small diameter pile 200 Wall Relocation Building Remodeling Method Using Frame. 4. The method according to any one of claims 1 to 3,
The load transfer frame 300 includes a plurality of braces 330 installed between the upper plate 310 configured at the upper portion, the lower plate 320 configured at the lower portion, and the upper plate 310 and the lower plate 320. Wall pre-existing building remodeling method using a small diameter pile and a load transition frame characterized in that the triangular truss shape made.

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