KR20210000234A - Method for Alternate Basement Vertical Structure Construction Method in Top Down Construction Project - Google Patents

Abstract

According to the present invention, in order to shorten a period for basement framework construction in a basement top-down method for construction, provided is a construction method wherein basement vertical members (core parts, pillars) are alternately constructed to a lower floor and then remaining vertical members are constructed at the same, thereby shortening a construction period. According to the present invention, the top-down construction method performing alternate connection includes: a first step of installing a retaining wall and constructing a basement pillar post, and then, excavating a bed for a first basement floor and constructing a first ground floor; a second step of first constructing a core part of the first basement floor to support a core part of the ground floor constructed upward while constructing a basement floor slab to a lower floor; a third step of constructing basement vertical members downward on an alternate basis floor by floor by using a bottom-up method; and a step of constructing the lowermost mat or foundation, and then, constructing basement vertical members for remaining floors at the same time or step by step by using the bottom-up method. Therefore, since a period for the construction of basement vertical members is shortened, subsequent ground framework and finishing construction can be started at an early stage, which can lead to a reduction in the entire construction period.

Description

[Method for Alternate Basement Vertical Structure Construction Method in Top Down Construction Project}

The present invention is to shorten the period of the basement framework work in the top-down of the construction work reverse punching method, and more specifically, one by one after the construction of the basement vertical member alternately down and one layer down in a suntaro, and then one after the mat and It is possible to shorten the underground vertical member and the entire construction period by providing a construction method in which vertical members of the remaining layers are simultaneously or sequentially constructed collectively.

The reverse drilling method (top-down, top-down) is a construction method that shortens the construction period by constructing a frame work on the ground floor while forming a frame work to the basement floor.

The order of construction of the general basement back-throwing method is to install soil barriers and pillars, digging each floor, and constructing slabs, and finally, constructing the lowermost foundation or mat, and having a depth of 4 to 8 floors below the ground.

Among the vertical members of the basement, the pile pillars are constructed at the beginning of the construction, the core of the first basement level is constructed for the construction of the ground floor, and the remaining vertical members (core walls, pillars) are constructed in a sunta (from the bottom to the top) after the mat is placed.

The reason why underground core walls and pillars cannot be constructed while going downstairs is that installing core walls from top to bottom is expensive and quality is difficult to secure. In addition, if a large number of core walls are installed before the mat is placed, a lot of load is placed on the PRD and RCD piles (pile), making it impossible to construct multiple ground floors, and the meaning of top-down disappears.

The ground floor framing work is constructed at the same time as the basement floor, but the number of floors that go up before the foundation and mat construction and the number of floors that go up until the completion of the underground vertical member is structurally limited. For example, it is possible to only up to 8 floors above the ground until foundation and mats are placed, and up to 15 floors above the ground until the underground vertical member is completed, and after the underground vertical member is completed, a construction constraint is imposed that allows you to climb to the rooftop without restrictions. .

Therefore, if the period of the basement frame construction increases, the above-ground frame construction should be constructed only up to the 8th or 15th floor and should be stopped and waited. On the contrary, if the basement floor frame work is accelerated, the ground floor frame work is also accelerated, and the entire construction period is greatly affected by the basement floor construction speed.

In particular, the ground floor frame construction takes 6 to 7 days to construct one base layer, and four or more floors are constructed per month, but the basement layer takes one month or more for one floor, so the construction speed of the basement floor is relatively slow.

The problems in the conventional reverse punching method top-down are as follows.

The conventional underground construction sequence is progressed by soil barriers, piles, digging and slab construction down each floor, mat construction at the bottom floor, and sequential construction of the underground vertical members upward.

Here, the underground vertical member has a characteristic that it proceeds as a sunta (construction from the lower floor to the upper floor) after the mat is placed. The construction period of the basement vertical member takes 25 to 30 days for the construction of one floor, and 5 to 6 months for the basement 6 floor.

The core wall and the underground vertical member, which is a pillar, are installed with a sunta (from bottom to top) after mat is placed. Since the ground level can continue to rise after the underground vertical member is completed, the underground vertical member is a critical path that determines the construction period.

On the other hand, while the construction speed of the ground floor frame is 7 days per floor, the number of floors that can be ascended to the time of placing the basement mat (for example, 8 floors above ground) and the completion of the underground vertical member (15 floors above ground) is limited. Construction suspension and construction waiting occur at the inflection point on the 15th floor above the ground.

During the underground vertical member construction period, the condition that the construction of each floor should be performed continuously and smoothly with no margin should be achieved. If there is a delay in even one floor, the ground floor construction will be delayed that much. Therefore, the existing construction method in which the underground vertical member must be continuously and smoothly constructed in a short period has a very high risk of delay.

The reverse punching method has the advantage of shortening the construction period by constructing the ground floor while constructing the basement layer. However, according to the structural constraints that the above-ground floor cannot rise more than a certain number of floors depending on the construction speed of the basement floor, the air is greatly affected by the underground frame construction.

Application No./Date 1020110024619 (2011.03.18), Applicant Hanbit Structural Engineering Co., Ltd., Registration No./Date 1012420170000 (2013.03.05), Name of the invention In parallel with ground and subterranean structures using the core of the above-ground layer and the core part of the above-ground layer to be constructed first Construction Method, Application No. Special 1995-0003110, filing date February 18, 1995, parallel construction method of the ground floor and basement frame of a building structure Application No. 10-2003-0037296, Application date June 10, 2003, A building structure having a mixed structure of a reinforced concrete structure and a steel frame reinforced concrete structure, and its simultaneous construction method Application number 10-2011-0087835, application date August 31, 2011, registration number 10-1101182, registration date December 26, 2011, reverse drilling method of underground structures Application number 10-2013-0004918, application date January 16, 2013, registration number 10-1426511, registration date July 29, 2014, temporary frame system used when constructing underground structures of buildings and reverse punching method using the same

The present invention has been invented to solve the problems of the prior art as described above, and shortens the construction period of the underground vertical member, which takes a lot of time in the reverse punching method, so that the ground floor frame construction can be carried out early. Accordingly, the entire construction period is shortened.

In order to achieve the above object and to solve the problems of the prior art described above, the underground vertical member construction method alternately constructed every other according to the present invention

One floor is sequentially constructed downward by alternating every other vertical member in the basement, and after that, the remaining vertical members are distributed among the previously constructed vertical members and simultaneously sandwiched and constructed or sequentially constructed.

According to the present invention, the following effects can be expected.

The construction period is shortened by pre-installing a number of underground vertical members in the overall process schedule and excluding them from the main line (Criticla path) that determines the construction period.

Since every other underground vertical member is constructed, the buckling length of the column is shortened, allowing more ground floors to be constructed, reducing the overall construction period.

If every other underground vertical member is constructed, the remaining parts to be constructed upward can be simultaneously constructed, reducing the overall construction period.

Each floor core wall and pillars are constructed one by one, so each floor can be constructed in succession. Before the mat is placed, every other layer (1st, 3rd, 5th basement floor) is installed in a row because the upper floors (2nd and 4th basement) are empty. Since every other layer (2nd, 4th, 6th basement floor) remaining after the mat is placed is already constructed, it is easy to connect reinforcing bars and can be easily constructed by attaching an alform frame.

Since the underground vertical member can be constructed early after the slab construction of the corresponding floor, there is little room for delay in construction, so the entire construction period is not delayed.

Construction period can be further shortened by constructing only rebar assembly first and placing concrete at the same time.

Conventionally, after the mat was poured, vertical members were installed on the 6th basement level, followed by sequential construction of 5 basement levels, 4 basement levels, 3 basement levels, and 2 basement levels. Accordingly, conventionally, it took a total of 150 days to construct 5 floors in Suntaro for 30 days per floor, but according to the present invention, the odd-numbered layers were already completed before the mat was placed, and after the mat was placed, the even-numbered floors were 6 basement levels, 4 basement levels, and 2 basement levels. It takes only 30 to 50 days to construct the floors simultaneously or in a pure manner. As a result, conventionally, it took 150 days to complete the basement layer after placing the mat, but according to the present invention, it took 30 to 50 days, resulting in a reduction of 100 to 120 days. Accordingly, the entire construction period is also reduced by about 120 days (3 to 4 months).

According to the present invention, in an office building with 6 floors below ground and 39 floors above the ground, it is 35 to 36 months compared to 39 months, showing an effect of shortening the construction period of about 3 to 4 months (about 8% to 10% of the total air).

Shortening the entire construction period in offices and officetels has high economic effects, such as early pre-sale, rental income, and additional sales (25% of annual sales), along with reduction of construction costs such as construction management and field expenses from the perspective of the construction company. Has.

1 is an overall flowchart of a method for constructing an underground vertical member that is constructed every other time according to the present invention.
2 to 7 is a vertical member construction method of the scale in the case of eight basement floors constructed every other according to the present invention.
Figures 8 to 12 are vertical member construction method in the case of the seventh basement level constructed every other according to the present invention.
13 to 17 is a vertical member construction method in the case of the sixth basement level constructed every other according to the present invention.
18 to 20 is a vertical member construction method in the case of a fifth basement level constructed every other according to the present invention.
Figure 21 is a vertical member construction method in the case of four basement levels that are constructed every other time according to the present invention.

Hereinafter, a method of constructing a vertical member of the basement layer of the reverse punching method alternately constructed every other according to the present invention will be described in detail.

1 is an overall flowchart of a method of constructing an underground vertical member of the reverse punching method that is constructed every other time according to an embodiment of the present invention. The project to be implemented is an SRC office building with 6 stories below ground and 39 stories above ground.

Referring to FIG. 1, in the construction method of the underground vertical member according to the present embodiment, in the soil barrier construction step (S10), a soil barrier is constructed in the basement based on the outer wall of the basement layer of the building, and a slurry wall, CIP, H-Pile, and earth plate are constructed. do.

In the underground pile construction step (S20), columns such as PRD and RCD ACT are constructed to the depth of the foundation and mat by using equipment from the first floor in order to support the basement slab in the reverse punching method.

In the first-floor slab construction step (S30), the first basement floor is excavated, and the first-floor slab is completed by pouring steel beams, deck plates, and concrete using the columns constructed in step (S20).

In the first basement level slab construction step (S40), the second basement level is excavated, and the first basement level slab is completed like the first level.

In the first basement level vertical member (core part, column) construction step (S50), the first basement level core part is completed from the first basement level slab constructed in the step (S40) so that the core part frame can be constructed upward to the ground level.

In the ground-floor frame (1st) construction step (S60), the ground-floor core portion and pillars are completed from the first basement core portion and pillars constructed in the step (S50). For example, if the structural condition of the PRD pile allows only 8 floors above the ground to be constructed before mat construction, the above ground floor frame (1st) is constructed up to 8 floors above the ground.

In the second basement slab construction step (S70), after the step (S40), the third basement level is dug downward, and then the second basement level slab is constructed.

In the slab construction step (S80) of the 3rd basement level, after the step (S70), the 4th basement level is dug downward, and the slab of the 3rd basement is constructed.

In the basement three-story vertical member construction step (S90) according to a feature of the present invention, the basement three-story core part is completed from the basement three-story slab constructed in the step (S80). In the step (S50), after constructing the first basement core part, if the construction of the second basement core part is omitted and the third basement core part is installed every other floor, the construction can be performed in a straightforward manner.

Conventionally, the core part of the basement 3rd floor was constructed sequentially from the 6th floor of the basement after the mat was placed, but according to the present invention, the vertical member of the basement 3rd floor has the effect of shortening the construction period by constructing one floor after the core part of the 1st basement is constructed.

In the slab construction step (S100) of the fourth basement level, after the step (S80), the 5th basement level is dug downward, and then the slab of the fourth basement level is constructed.

In the step of constructing a slab with a 5th basement level (S110), after the step (S100), after digging the 6th basement level downward, a slab with a 5th basement level is constructed.

In the step of constructing a vertical member of the fifth basement level according to the present invention (S120), a core part of the fifth basement level is completed from the slab of the fifth basement level constructed in the step (S110). In the step (S90), after constructing the core of the third basement level, if the construction of the core of the fourth basement is omitted and the core of the 5th basement is constructed every other floor, it can be constructed in a straightforward manner.

Conventionally, the core part of the basement 5th floor was constructed sequentially from the 6th floor of the basement after the mat was placed, but according to the present invention, the vertical member of the basement 5th floor is constructed one floor after the core part of the 3rd basement level is constructed, thereby shortening the construction period.

The three basement vertical member construction step (S90) and the fifth basement vertical member construction step (S120) are a method of pre-installing one layer before placing the mat in accordance with the features of the present invention to shorten the construction period.

Thereafter, in the foundation or mat construction step (S130), after the final digging downwards following the step (S110), the foundation and mat are constructed. When the mat is installed, now make a U-turn and construct the basement level vertical member and the ground level frame at the same time upward. For example, the ground frame can be raised up to 8 floors before mat construction, up to 15 floors can be constructed until the basement vertical member is completed, and the top floor, the roof layer, can be constructed after the basement vertical member is completed.

When the foundation and mat are completed (S140), now construct the underground vertical member (core part, pillar).

Among the vertical basement members, the first basement level (S50), the basement level 3 (S90), and the basement level 5 (S120) were constructed in advance according to the present invention, so the remaining vertical members are 6 basement levels, 4 basement levels, and 2 basement levels. In the present invention, in the construction of the remaining vertical members (6 basement levels, 4 basement levels, 2 basement levels), since the core part is already constructed above and below the corresponding floor, it has the advantage and characteristic that it can be constructed at the same time (S150, S160, S170).

Conventionally, after constructing the core of the 6th basement level, the 5th basement level was constructed, followed by 4 basement levels, 3 basement levels, and 2 basement levels in order. However, according to the present invention, since the remaining vertical members (6 basement levels, 4 basement levels, and 2 basement levels) can be constructed at the same time, only a period of construction of one floor is required.

Accordingly, the core part of the two floors of the 3rd basement and 5th basement is first constructed before the mat is placed, and the remaining vertical members (6th, 4th, and 2nd floors) are simultaneously constructed after the mat is placed. Has the effect of Therefore, since it usually takes 30 days for one floor vertical member, it took 150 days in the past, but according to the present invention, it took 30 days to reduce the overall construction period of 120 days (4 months).

When the underground vertical member is completed as described above (S170), the ground floor frame (secondary) (S180) may be started next. For example, the ground floor frame (primary) can be constructed up to 15 floors above the ground until the basement vertical member is completed, and after the basement nonwoven member is completed, it is a ground floor frame (secondary) (S180) from the 16th floor to the top (roof). ) Can be constructed without restrictions.

2 to 7 is a sequence of a vertical member construction method in the case of the eighth basement level of the reverse punching method alternately constructed according to an embodiment of the present invention.

The construction sequence is as follows.

Dirt barrier

Prd, RDC, ACT column

Excavating the 1st basement level and 2nd basement level

Basement 1st floor steel deck reinforced concrete pouring (slab pouring)

Excavating the 3rd basement floor

2nd basement slab casting, Core wall pillar placement on the first basement floor

Excavating the 4th basement floor

Slab placement on the 3rd basement floor

Excavating the 5th basement floor

4 basement level slab casting, Core wall pillar placement on the 3rd basement floor

Excavating the 6th basement floor

Slab placement on the 5th basement floor

Excavating the 7th basement floor

6 basement level slab casting, Core wall pillar placement on the 5th basement floor

Excavating the 8th basement floor and excavating the mat

7th basement slab casting, 7th basement level core wall pillar placement

Floor mats on the 8th basement floor

The remaining floors, 8 basement levels, 6 basement levels, 4 basement levels, and 4 basement levels, core wall pillar placement (simultaneous construction of 4 floors)

Or, add 8 basement levels and one level, and build the second core wall pillars on the remaining two levels after the first construction of two floors (two floors, two times)

Or add 8 basement levels and one floor, and after the first construction of two floors, the remaining two floors are constructed as core wall pillars in the second and third lanes one by one (2 floors 1 time, 1 floor 2 times total 3 times)

Or, after constructing the core wall pillar on the 8th basement level, the remaining 3 floors are constructed one by one (4 floors are constructed 4 times in total)

After the mat is poured, there are 4 remaining layers, and it is divided into 1, 2, 3, and 4 times.

8 to 12 is a sequence of a vertical member construction method in the case of the seventh basement level of the reverse punching method alternately constructed every other according to an embodiment of the present invention.

The construction sequence is as follows.

Dirt barrier

Prd, RDC, ACT column

Excavating the 1st basement level and 2nd basement level

Basement 1st floor steel deck reinforced concrete pouring (slab pouring)

Excavating the 3rd basement floor

2nd basement slab casting, Core wall pillar placement on the first basement floor

Excavating the 4th basement floor

Slab placement on the 3rd basement floor

Excavating the 5th basement floor

4 basement level slab casting, Core wall pillar placement on the 3rd basement floor

Excavating the 6th basement floor

Slab placement on the 5th basement floor

Excavating the 7th basement floor and excavating the mat

6 basement level slab casting, Core wall pillar placement on the 5th basement floor

Floor mats on the 7th basement floor

The remaining floors are 7 basement levels, 6 basement levels, 4 basement levels, and 2 basement levels.

Add 7 basement levels and 1 level (choose 1 from 4 basement levels or 2 basement levels) and install 2 floors remaining after the 1st construction of 2 floors and 2nd core wall pillar construction (2 floors 2 times construction)

Alternatively, 2nd floor construction from the 7th basement level and the remaining 3 floors, the remaining 1 floor construction (a total of 3 divisions)

Alternatively, each layer is constructed and constructed four times.

13 to 17 are a sequence of a vertical member construction method in the case of the sixth basement level of the reverse punching method alternately constructed every other according to an embodiment of the present invention.

The construction sequence is as follows.

Dirt barrier

Prd, RDC, ACT column

Excavating the 1st basement level and 2nd basement level

Basement 1st floor steel deck reinforced concrete pouring (slab pouring)

Excavating the 3rd basement floor

2nd basement slab casting, Core wall pillar placement on the first basement floor

Excavating the 4th basement floor

Slab placement on the 3rd basement floor

Excavating the 5th basement floor

4 basement level slab casting, Core wall pillar placement on the 3rd basement floor

Excavating the 6th basement floor and excavating the mat

Slab placement on the 5th basement floor

Floor mat placement on the 6th basement floor, Core wall pillar placement on the 5th basement floor

In the remaining floors, 6 basement levels, 4 basement levels, and 2 basement levels

Simultaneous construction with the remaining 3 floors (total 1 time)

Or, after constructing the 6th basement level, simultaneously construct the 4th basement level and the 2nd basement level (2 times in total)

Or, construct the 6th basement level and 4th basement level at the same time and then build 2 basement levels (total of 2 times)

Each floor is constructed and constructed three times (a total of three divided constructions).

18 to 20 are a sequence of a vertical member construction method in the case of the fifth basement level of the reverse punching method alternately constructed every other according to an embodiment of the present invention.

The construction sequence is as follows.

Dirt barrier

Prd, RDC, ACT column

Excavating the 1st basement level and 2nd basement level

Basement 1st floor steel deck reinforced concrete pouring (slab pouring)

Excavating the 3rd basement floor

2nd basement slab casting, Core wall pillar placement on the first basement floor

Excavating the 4th basement floor

Slab placement on the 3rd basement floor

Excavating the 5th basement floor and excavating the mat

4 basement level slab casting, Core wall pillar placement on the 3rd basement floor

Floor mat placement on the 5th basement floor

In the remaining floors, 5 basement levels, 4 basement levels, and 2 basement levels

After construction of 5 basement levels, simultaneous construction of 4 basement levels and 2 basement levels (2 times in total)

Or, after simultaneous construction of 5 basement levels and 2 basement levels, construct 4 basement levels (2 times in total)

Construct one layer at a time with the remaining 3 layers (a total of 3 times).

21 is a sequence of a vertical member construction method in the case of a fourth basement level of the reverse punching method alternately constructed every other according to an embodiment of the present invention.

The construction sequence is as follows.

Dirt barrier

Prd, RDC, ACT column

Excavating the 1st basement level and 2nd basement level

Basement 1st floor steel deck reinforced concrete pouring (slab pouring)

Excavating the 3rd basement floor

2nd basement slab casting, Core wall pillar placement on the first basement floor

Excavating the 4th basement floor and excavating the mat

3 basement level slab casting, Core wall pillar placement on the 3rd basement floor

Floor mats on the 4th basement floor

In the remaining floors, the 4th basement level and the 2nd basement level

Simultaneous construction of 4 basement levels and 2 basement levels (1 time in total)

The remaining 2 floors are constructed one by one (2 times in total).

Claims (1)

In the frame construction of the construction basement construction,
Step of constructing an underground pile;
Step of going down while excavating underground;
Step of constructing underground horizontal materials (slab steel frame and deck, reinforcing bar, concrete);
Constructing vertical materials (core walls, pillars) of one basement level (N level);
Constructing a core wall and a pillar of the other layer (N-2 layer) for every other layer (N layer);
Constructing a core wall and a pillar of the other layer (N-4 layer) for every other layer (N-2 layer);
Repeating the process every other time;
The step of constructing the basement foundation and mat;
Constructing the core wall and pillars of the remaining layers constructed in the above process;
Characterized in that it is constructed, including
Vertical material construction method of every other work.

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