KR20220024070A - The underground vertical member construction method of the reverse perforation method, which is constructed alternately every other time - Google Patents

Abstract

The present invention is to shorten the period of underground framing construction in the top-down of the basement level reverse perforation method of construction work, and the construction of underground vertical members (core part, column) alternately every other one to the lower floor, and then to construct the remaining vertical members at the same time method to shorten the construction period.
After installing the retaining wall and installing the underground pillar piles, the first step of excavating the first basement floor and constructing the first floor floor above the ground;
a second step of constructing the first basement core in order to support the above-ground core to be constructed upward while constructing the basement slab as a lower floor;
A third step of constructing the underground vertical members alternately downward;
After constructing the lowest floor mat or foundation, simultaneously constructing the remaining basement nonwoven member;
It is characterized in that by shortening the underground vertical member, it is possible to start the later above-ground framing and finishing work at an early stage, thereby shortening the overall construction period.

Description

The underground vertical member construction method of the reverse perforation method, which is constructed alternately every other time

The present invention is to shorten the period of underground framing construction in the reverse drilling method top-down construction work, and more specifically, construct an underground vertical member alternately every other time, and then install the vertical member of the remaining floor after the mat and foundation construction. At the same time, it is possible to shorten the underground vertical member and the overall construction period by providing a construction method for collective construction.

The reverse perforation method (top-down) is a method of shortening the construction period by constructing a framing work on the basement floor while simultaneously constructing a framing work on the ground floor.

The general order of construction of the basement level reverse drilling method is to install retaining walls and columns, excavate each floor, construct slabs, and finally construct the lowest floor foundation or mat, and have a depth of 4 to 7 floors underground.

Among the vertical members in the basement, pile columns are constructed at the initial stage of construction, the core part of the first basement floor is constructed for the framing work of the ground floor, and the remaining vertical members are constructed by rolling (from the lower floor to the upper floor) after placing the foundation or mat.

At this time, although the above-ground framing work is constructed at the same time as the basement, the number of floors that rise before the foundation and mat construction and the number of floors that rise until the completion of the basement vertical member is structurally limited. For example, up to the 8th floor slabs are possible until the foundation and mat are placed, and the 15th floor slabs are allowed until the basement vertical members are completed. is granted

Therefore, if the period of basement frame construction increases, the above ground level frame should be constructed only up to the 8th or 15th floor, then stop and wait. Conversely, if the basement level construction is accelerated, the above ground level frame construction will also be accelerated, so the overall construction period is greatly affected by the underground floor construction work.

In particular, in the case of the ground floor, it takes about 6 to 7 days to construct one base floor, so more than four floors are constructed in a month, but for the basement floor, it takes 1.5 months or 2 months for one floor, so the construction speed of the basement is relatively slow.

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

The conventional underground construction sequence consists of retaining walls, piles, digging and slab construction on each floor, foundation or mat construction on the lowest floor, and upward construction of underground vertical members.

Here, the underground vertical member has the characteristic that it proceeds in a sequence (construction from the lower floor to the upper floor) after the foundation or the mat is poured. The construction period of the underground vertical member takes 20 to 25 days for one floor and 4 to 5 months for the sixth basement.

Underground vertical members are installed by rolling (bottom to top) after placing the foundation or mat. Since the ground floor 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, the construction speed of the above-ground structure is fast, with a cycle of 6-7 days per floor, while the number of floors that can be climbed up to the time of placing the basement floor mat (eg, the 8th floor above the ground) and the completion of the underground vertical member (15th floor above the ground) is limited. At the inflection point of the first floor and the 15th floor, construction stops and construction waiting occurs.

During the underground vertical member construction period, the condition that the construction of each floor should be carried out continuously and smoothly without any leeway must be achieved. If even one floor is delayed, the ground floor construction will be delayed by that much. Therefore, the existing construction method, which requires continuous and smooth construction of underground vertical members in a short period of time, has a very high risk of delay.

The reverse drilling method has the advantage of shortening the construction period by constructing the ground floor while constructing the basement floor. However, depending on the construction speed of the basement, the air quality is greatly affected by the construction of the basement due to the structural constraint that the above-ground floor cannot go up to more than a certain number of floors.

The related applications are as follows.

Application No./Date 1020110024619 (2011.03.18), Applicant Hanbit Structural Engineering Co., Ltd., Registration No./Date 1012420170000 (2013.03.05), Title of Invention Parallel above-ground and underground structures using lattice-type lintel beams inside the core and the priority-constructed above-ground core

construction method,

Application No. 1995-0003110, Application date February 18, 1995, Method of parallel construction of above-ground and basement structures of building structures

Application No. 10-2003-0037296, filing date June 10, 2003, Building structure having a mixed structure of reinforced concrete structure and steel frame reinforced concrete structure and method for simultaneous construction thereof

Application No. 10-2011-0087835, Application Date August 31, 2011, Registration No. 10-1101182, Registration Date December 26, 2011, Reverse perforation method of underground structures

Application No. 10-2013-0004918, Application Date January 16, 2013, Registration No. 10-1426511, Registration Date July 29, 2014, Temporary frame system used in the construction of underground structures of buildings and reverse drilling method using the same

The present invention was devised to solve the problems of the prior art as described above, and shortens the construction period of the underground vertical member in the reverse perforation method so that the above-ground framing work can be continuously carried out. Accordingly, to shorten the overall construction period do.

In order to achieve the above object and solve the problems of the prior art, the underground vertical member construction method alternately constructed according to the present invention constructs every other underground vertical member downward alternately, and thereafter, the remaining vertical members Distributed between the previously constructed vertical members and installed at the same time.

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

The construction period is shortened by pre-constructing a number of underground vertical members on the entire process table and excluding them from the critical path, which determines the construction period.

By constructing every other vertical member under the ground, the buckling length of the column is shortened and more ground floors can be constructed, thereby shortening the overall construction period.

If every other underground vertical member is constructed, the remainder of the upward construction can be constructed at the same time, thereby shortening the overall construction period.

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

The construction period can be further shortened by constructing only the rebar assembly first and pouring the concrete at the same time.

Conventionally, after placing the mat, the vertical member was installed on the 6th basement floor, and then the 5th basement floor, the 4th basement floor, the 3rd basement floor, and the 2nd basement floor were installed sequentially in that order. Accordingly, conventionally, it took a total of 125 days to construct 5 floors in Sunta-ro, but 25 days per floor. It takes only 25 days to construct the layers at the same time. As a result, in the prior art, it took 125 days after placing the mat, but according to the present invention, it takes 25 days, so 100 days are shortened as a result. As a result, the overall construction period is shortened by about 100.

According to the present invention, in an office building with 6 floors underground and 39 floors above ground, it shows an effect of shortening the period of about 3 months (about 8% of the total air) from 39 months to 36 months.

The reduction of the overall construction period in offices and officetels has high economic effects such as reduction of construction costs such as construction management costs and field expenses from the construction company side, and early sales, rental income, and additional sales (25% of annual sales) from the building owner’s side. has

1 is an overall flow chart of the underground vertical member construction method to be constructed every other one according to the present invention.
2 to 3 are an example of a process table of a 39-story office building of the underground vertical member construction method to be constructed every other one according to the present invention.
Figure 4 is an enlarged process table of the underground vertical member process according to the present invention of Figure 2;
Figure 5 is an example of the process table of the latest starting point of the underground vertical member to be constructed every other according to the present invention.
Figure 6 is a comparative process table of the earliest starting point and the latest starting point of the underground vertical member constructed every other one according to the present invention.
7 is an overall flowchart of a method of constructing an underground vertical member of a conventional conventional method.
8 to 9 are an example of a process table of a 39-story office building to which the conventional method is applied.
Figure 10 is an enlarged process table of the underground vertical member process of the conventional conventional method of Figure 8.
11 is a comparative process table comparing the process of the underground vertical member constructed every other one according to the present invention with the conventional conventional construction method.
12 to 13 are a comparison of the schedule difference for each floor by comparing the schedule difference between the overall process table of the conventional conventional method ( FIGS. 8 and 9 ) and the overall process table of the underground vertical member constructed every other one according to the present invention ( FIGS. 2 and 3 ). comparison table.
14 is a process comparison graph comparing the overall process table of the conventional conventional method ( FIGS. 8 and 9 ) and the overall process table of the underground vertical member constructed every other one according to the present invention ( FIGS. 2 and 3 ) in an S-Curve form.

Best mode for carrying out the invention

Hereinafter, the construction method of the basement vertical member of the reverse drilling method alternately constructed according to the present invention will be described in detail.

1 is an overall flow chart of the underground vertical member construction method of the reverse perforation method constructed every other one according to an embodiment of the present invention. The target project is an SRC office building with 6 stories below the ground and 39 above.

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

In the underground pile construction step (S20), the pillars of the building are constructed from the ground to the foundation and the mat to support the basement slab in the reverse drilling method, and PRD and RCD are constructed.

In the first-floor slab construction step (S30), the first-floor slab is completed by excavating the first underground floor and pouring the steel beam, deck plate and concrete using the column constructed in the step (S20).

In the first basement slab construction step (S40), the second basement is excavated and the slab of the first basement is completed as in the first floor.

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

In the above-ground frame (first) construction step (S60), the above-ground core part and the pillar are completed from the first basement core part and the column constructed in the step (S50). For example, if it is possible to construct a frame up to the 8th floor before the mat construction due to the structural condition of the PRD file, in the above-ground level framing (1st) step, the frame is constructed up to the 8th floor above the ground.

In the second basement slab construction step (S70), after excavating the third basement floor downward following the step (S40), the second basement slab is constructed.

In the 3rd basement slab construction step (S80), after excavating the 4th basement floor downward following the (S70) step, the 3rd basement slab is constructed.

In the construction step (S90) of the vertical member on the 3rd basement level according to the characteristics of the present invention, the core part on the 3rd basement level is completed from the 3rd basement floor slab constructed in the step (S80). If, after constructing the first basement core part in step (S50), construction of the second basement core part is omitted, and the third basement core part is constructed every other floor, the construction can be done in a straight line, which facilitates construction.

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

In the 4th basement slab construction step (S100), after excavating the 5th basement floor downward following the step (S80), the 4th basement slab is constructed.

In the 5th basement slab construction step (S110), after excavating the 6th basement floor downward following the step (S100), the 5th basement slab is constructed.

In the 5th basement vertical member construction step (S120) according to the characteristics of the present invention, the core part of the 5th basement is completed from the 5th basement slab constructed in the step (S110). After constructing the core part on the 3rd basement level in the step (S90), the construction of the core part on the 4th basement level is omitted and the core part on the 5th basement floor is constructed every other floor.

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

The 3rd basement vertical member construction step (S90) and the 5th basement vertical member construction step (S120) are a method of pre-constructing every other layer before placing the mat according to the characteristics of the present invention, thereby shortening the construction period.

After that, in the foundation or mat construction step (S130), after the final excavation downward following the step (S110), the foundation and the mat are constructed. After the mat is installed, now make a U-turn and construct the basement vertical member and the above-ground frame at the same time. For example, the above-ground frame can be raised up to the 8th floor before mat construction, up to the 15th floor until the basement vertical member is completed, and up to the roof layer, which is the top floor, after the basement vertical member is completed.

When the foundation and the mat are completed (S140), now the underground vertical member (core part, column) is constructed.

Of the vertical members in the basement, the first basement floor (S50), the third basement floor (S90), and the fifth basement floor (S120) were pre-constructed according to the present invention, so the remaining vertical members are the 6th basement floor, the 4th basement floor, and the second basement floor. In the present invention, in constructing the remaining vertical members (6th basement floor, 4th basement floor, and 2nd basement floor), since the core part has already been constructed above and below the corresponding floor, it has the advantage and feature that it can be constructed at the same time (S150, S160, S170).

Conventionally, after the core part of the 6th basement was constructed, the 5th basement floor was constructed, and then the 4th basement floor, the 3rd basement floor, and the 2nd basement floor were to be constructed in that order. However, according to the present invention, since the remaining vertical members (the 6th basement floor, the 4th basement floor, and the 2nd basement floor) can be simultaneously constructed, only one floor construction period is required.

Accordingly, the core of the 3rd basement and 5th basement floors are first installed before the mat is placed, and the remaining vertical members (6th, 4th, and 2nd floors) are installed at the same time after the mat is placed. has the effect of Therefore, when it takes 25 days for one-story vertical member, it takes 125 days in the prior art, but according to the present invention, it takes 25 days, thereby reducing the total construction period of 100 days.

When the underground vertical member is completed as described above (S170), then the above-ground floor framing (secondary) (S180) can be started. For example, the above-ground frame (primary) can be constructed up to the 15th floor above the ground until the underground vertical member is completed, and after the basement non-woven member is completed, the above-ground frame (secondary) (S180) from the 16th floor to the top floor (roof) ) can be constructed without restrictions.

2 to 3 are overall process tables of the underground vertical member construction method of the reverse drilling method alternately constructed every other according to an embodiment of the present invention.

Referring to FIG. 2, this embodiment is an office building with 6 stories below the ground and 39 above the ground, and is an SRC group, reverse top-down construction method. The start date is January 1, 2019.

Referring to the process table, H-pile / CIP is constructed in the retaining construction stage (work number 6 in the first column on the left of the process table) and the work period is 80 days.

The 7th PRD is to construct a number of pile columns in the basement, and the period is 70 days.

Work No. 8 Excavation of the basement 1st floor and slab on the 1st floor is an SRC construction that constructs the 1st floor steel beams on piles and pours the deck plates and concrete when the PRD work of No. 7 work is completed. The duration is 50 days.

In the case of excavating the 2nd basement floor and constructing the 1st basement slab (work 9, indicated by the number below), when the 1st floor slab (8) is completed, dig the 2nd basement floor downward and then construct the 1st basement slab (9) and the period is 50 days.

When the first basement slab 9 is completed, the first basement core part and the pillar 22 are constructed so that the construction can proceed to the above-ground floor. As a result, both the basement and ground floor upward construction are carried out at the same time, and this is generally referred to as top-down construction.

When the first basement core part 22 is completed, it is possible to continuously work from the second-floor slab 25 to the eighth-floor slab 31 above the ground. At this time, the load on the ground floor up to the 8th floor is received by the PRD.

Since the 9-story slab 32 can proceed only when the mat concrete 15 is installed, the construction is stopped for about 4 months after the 8-story 31 is completed. According to the structural calculation, since the PRD can only support the load up to the 8th floor (31) above the ground, the 9th floor (32) can be started after the mat is placed.

Alternatively, the construction of the ground floor from the 2nd floor can be started about 3 months later and the waiting period between the 8th and 9th floors can be minimized to continue construction or proceed slowly to the 8th floor.

When the first basement slab 9 is completed, the second basement slab 10 is constructed after digging the third basement floor downward, and the period is 50 days.

When the 2nd basement slab 10 is completed, then the 4th basement level is excavated and then the 3rd basement level slab 11 is constructed, and the period is 50 days.

When the 3rd basement slab 11 is completed, the 3rd basement core part 20 is first constructed according to the characteristics of the present invention. In the existing construction method, the 3rd basement floor core 20 is being constructed upward from the 6th basement floor after the mat 15 is completed. Therefore, according to the present invention, the underground three-story core 20 is constructed first compared to the existing construction method, and thus the construction period is shortened.

After the first basement core part 22 is constructed, the third basement core part 20 is constructed every other floor by skipping the second basement core part 21 of the lower floor. The reason is that it is difficult to construct the connection part by reverse hitting the core part 21 on the second basement floor, which is immediately below after the construction of the core part 22 on the first basement floor. Therefore, if the core part 20 on the 3rd basement is constructed every other floor after the construction of the core part 22 on the 1st basement level, since the 2nd basement, which is the upper floor, is empty, the 3rd basement floor can be worked sequentially, so construction is easy. .

When the core part 22 on the first basement level and the core part 20 on the third basement level are completed every other layer, the core part 21 on the second basement floor in between can be constructed by sandwiching them.

When the 3rd basement slab 11 is completed, the construction continues downward, excavating the 5th basement, and then constructing the 4th basement slab 12, and the period is 50 days.

When the 4th basement slab 12 is completed, the 5th basement slab 13 is constructed after excavating the 6th basement, and the period is 50 days.

At this time, when the 5th basement slab 13 is completed, the 5th basement core part 18 is first constructed according to the characteristics of the present invention. In the existing method, the 5th basement floor core 18 is being constructed upward in order from the 6th basement floor after the mat 15 is completed. Therefore, according to the present invention, the 5th basement core portion 18 has the characteristic of being constructed first compared to the existing construction method, and exhibits the effect of shortening the overall construction period.

After constructing the core part 20 on the 3rd basement level, the core part 18 on the 5th basement floor is constructed every other floor by skipping the core part 19 on the 4th basement floor below it. The reason is that the construction of the connection part is difficult to construct the core part 19 on the 4th basement floor, which is immediately below, by reverse hitting after the construction of the core part 20 on the 3rd basement level. It is the same as the case of the core part 20 on the third basement floor.

After excavating the 6th basement floor, after excavating the mat (14), the foundation and the mat (15) are constructed.

When the mat 15 is completed, the mat 15 supports the load that the PRD was supporting, so that the ground floor can go up to the 9th floor 32 or more.

On the other hand, the reason that the ground floor can only be raised to the 15th floor after the construction of the mat 15 until the completion of the underground vertical member is because the PRD in the basement is buckling and the PRD columns from the 6th basement to the 2nd floor are exposed. . However, according to the present invention, since the odd-numbered floors have already been constructed for every other floor, the PRD column is exposed at the height of only one floor, so there is little buckling restriction.

After the mat (15) is completed, the remaining frameworks in the basement are the 6th basement core 17, the 4th basement core 19, and the 2nd basement core 21. Since the 3rd basement level 20 and the 5th basement level core part 18 have been completed every other layer in advance, the core part of the remaining 3 floors can be constructed by sandwiching them between them.

According to a feature of the present invention, since the odd-numbered layer core has already been constructed, the remaining three layers can be worked simultaneously or at the same time or in sequence.

On the other hand, in the construction of the second basement core part 21 and the fourth basement core part 19, reinforcing bars are pre-constructed, and concrete is poured simultaneously after the mat 15 is poured to further increase productivity.

Therefore, in the prior art, three floors (about 75 days) were required because three floors had to be constructed in sequential order. It takes only a period of time and has the effect of shortening two floors.

According to the present invention, the construction period of two floors was shortened by pre-constructing the 3rd basement level core part 20 and the 5th basement floor 18 before the mat construction by alternately removing one underground vertical member, and after placing the mat 15, the remaining By constructing the core parts 17, 19, and 21 of three floors at once, the period of two floors is shortened, which has the effect of shortening the construction period of a total of four floors. Since the core part of the basement floor is the main line (Critical Path), the total air length is shortened.

Referring to FIG. 3 , the final work, the finishing work, along with the frame work from the 5th to the 39th floor is displayed. According to the reverse structural calculation, the 9-story slab 32 can be started after the mat is poured, and the 16-story slab 39 is completed with all of the underground vertical members and the process table is prepared. From the 16th floor to the 39th floor of the top floor, framing was carried out in a cycle of 6 days, and the general finishing work was applied for one year. The finishing work includes interior decoration work, elevator work, temporary dismantling of external curtain walls and tower cranes, etc., roof work, landscaping work, etc.

Therefore, the total construction period of the 39-story office building takes 1,106 days (about 36 months) as shown in the first operation of FIG. Compared to the previous construction method, the total construction period was shortened by about 3 months.

4 is an enlarged process table of the underground vertical member process of FIG. 2 .

Referring to FIG. 4, the vertical members of the odd-numbered floors among the underground vertical members (the first basement core part 22, the third basement core part 20, the fifth basement core part 18) are the slabs of the corresponding floors are completed. It indicates starting later. The remaining three floors of the remaining even-numbered vertical members (the 6th basement core 17, the 4th basement core 19, the 2nd basement core 21) are installed in parallel at the same time after the mat 15 is poured. indicates to be

The remaining even-numbered vertical members (17, 19, 21) have a feature that, since every other odd-numbered layer has already been installed, they can be sandwiched between them and constructed at the same time.

5 is an example of the schedule of the latest starting point of the underground vertical member to be pre-constructed every other according to the present invention.

The latest start time refers to the work schedule that can be constructed the latest without affecting the subsequent process. As late as possible start, finish refers to the schedule that can be constructed the latest without affecting the subsequent process.

Referring to FIG. 5 , the first basement core part 22 is constructed after completion of the first basement slab for the above-ground floor construction (25~). Next, it indicates that the three-story basement core 20 can be constructed the latest before the even-numbered basement vertical members 17, 19, and 21 are constructed.

6 is a comparative process table of the earliest starting point and the latest starting point of the underground vertical member constructed every other one according to the present invention. 6 is to explain the contents of the construction at which date or time in the process table because the construction order of the vertical member is determined.

Referring to FIG. 6 , operation numbers 16 to 21 indicate a fast process ( FIG. 4 ), and operation numbers 23 to 28 indicate a slow process ( FIG. 5 ). The core part of the 3rd basement floor can be compared through the early work No. 20 and the slow work No. 27. In other words, if you look at the start column in No. 20, the 3rd basement floor can be started quickly on January 1, 2020, and can be started on May 15, 2020 from No. 27. Of course, you can start at any time between January 1st and May 15th.

As described above, the idea and embodiment of the underground vertical member construction method constructed every other one according to the present invention from FIGS. 1 to 6 has been described.

The following describes the construction concept and embodiment of the underground vertical member of the conventional conventional method in the reverse drilling method from FIGS. 7 to 10 .

7 is an overall flowchart of the underground vertical member construction method of the conventional conventional method in the reverse drilling method.

Referring to FIG. 7 , after the retaining wall (T10) is constructed on the outside of the building, a PRD or RCD pile (T20) is constructed underground to form a reversed frame. After that, the underground slab is constructed downward while excavating the underground trench (T30~T100). After excavating the basement 6th floor (T100), complete the foundation and mat (T110).

Thereafter, the underground vertical members (T130-170) are sequentially constructed upward from the 6th basement floor (T130).

On the other hand, for the above-ground layer, after the core part (T50) of the first basement is completed, the above-ground frame (1st) (T60) is constructed. For example, up to the 8th floor slab of the branch is installed until the mat is poured. After placing the mat, construct the above ground level frame (secondary) (T180) from the 9th to 15th floors above the ground. When the underground vertical member (T130 ~ 170) is completed, it can be constructed without restrictions from the 16th floor above the ground.

In the conventional reverse drilling method, after the construction is done downward from the ground to the lowest floor, the mat is used as a turning point to U-turn and the underground vertical members are sequentially constructed upwards.

Therefore, the sequence of the basement floors is long and the underground construction period is long.

8 to 9 are overall process tables of the reverse punching method to which the conventional method is applied.

Referring to FIG. 8 , the conventional reverse punching method is an office building with 6 stories below the ground and 39 stories above the ground, and it is an SRC group, reverse tapping top-down construction method. The start date is January 1, 2019. It is the same as FIG. The reason for explaining the schedule by applying the existing construction method is to examine the difference between the construction sequence and the total construction period with the construction method according to the present invention.

Referring to the process table, the retaining construction stage (work number 6 in the first column on the left of the process table) is H-pile / CIP work, and the duration is 80 days.

The 7th PRD is to construct a number of pile columns in the basement, and the period is 70 days.

Work No. 8 excavation of the first basement floor and slab construction of the first floor is an SRC work of installing the first floor steel beams on the piles and pouring the deck plate and concrete when the PRD work of No. 7 work is completed, and the duration is 50 days.

In the case of excavation of the 2nd basement floor and construction of the 1st basement slab (work 9, indicated by the number below), when the 1st floor slab (8) is completed, excavate the 2nd basement floor downward and then construct the 1st basement slab. 50 days.

When the first basement slab 9 is completed, the first basement core part and the pillar 22 are constructed so that the construction can proceed to the above-ground floor. As a result, both the basement and ground floor upward construction are carried out at the same time, and this is generally referred to as top-down construction.

When the first basement core part 22 is completed, it is possible to continuously work from the second-floor slab 25 to the eighth-floor slab 31 above the ground. At this time, the load on the ground floor up to the 8th floor is supported by the PRD.

Since the 9-story slab 32 can be constructed only when the mat concrete 15 is poured, the construction is stopped for about 4 months after the 8th-floor 31 is completed. Since the PRD can only support the load up to the 8th floor (31) above the ground, it is possible to undertake the 9th floor (32) after placing the mat.

When the first basement slab 9 is completed, the second basement slab 10 is constructed after digging the third basement floor downward, and the period is 50 days.

When the second basement slab 10 is completed, then the third basement slab 11 is constructed after digging down the fourth basement level, and the period is 50 days.

When the 3rd basement slab 11 is completed, the construction continues downward, and after excavating the 5th basement, the 4th basement slab 12 is constructed, and the period is 50 days.

When the 4th basement slab 12 is completed, the 5th basement slab 13 is constructed after excavating the 6th basement, and the period is 50 days.

After excavating the 6th basement floor, after excavating the mat 14, the foundation or the mat 15 is constructed. When the mat 15 is completed, the mat 15 supports the load that the PRD was supporting, so that the ground floor can go up to the 9th floor 32 or more.

When the mat 15 is completed, the underground vertical members 17 to 21 are continuously directly connected from the core part 17 on the 6th basement level to the core part 21 on the 2nd basement floor, and it takes 25 to 30 days per floor. do. During this period, the ground floor can be constructed from the 9th floor (32) to the 15th floor (38).

Referring to FIG. 9 , the 10th to 39th floors above the ground and finishing work are displayed. The 16-story slab 39 has a process table written that all underground vertical members are completed and started. From the 16th floor to the top floor without any restrictions on the basement, framing is carried out in a cycle of 6 days, and the general finishing work is applied for one year.

Therefore, the entire construction period of the 39-story office building takes 1,194 days (about 39 months) as shown in the first operation of FIG.

The total air of 39 months is longer by 3 months compared to the total air of 36 months according to the present invention. The reason is that it takes a lot of time to construct the underground vertical walls sequentially from the 6th basement to the 2nd basement level.

10 is an enlarged process table of the underground vertical member process of the conventional conventional method of FIG. It shows that the underground vertical member is being constructed sequentially from operation number 17 to operation number 21 after the construction of the mat 15, and the period is 130 days and takes about 4.3 months.

11 is a comparative process table comparing the process of the underground vertical member constructed every other one according to the present invention with the process of the underground vertical member of the conventional conventional method.

Referring to FIG. 11, operation numbers 1 to 19 are the process tables of the conventional method, operation numbers 20 to 38 are the process tables according to the present invention, and operation number 39 shows the difference in the construction period between the conventional method and the method of the present invention.

First, in the prior art method, from 12 to 16, the core part of the five basement floors is sequentially constructed after the mat 10 construction, indicating that it takes 130 days.

On the other hand, according to the present invention, from operations 31 to 35, only 30 days are required after the mat 29 construction, indicating that the present invention is short of 100 days (39).

The reason is that the core part 34 on the 3rd basement level and the core part 32 on the 5th basement floor were previously constructed, and the remaining three-story core parts 31, 33, 35 after the mat 29 were installed at the same time or at the same time. This is because each can be inserted and constructed. After constructing every other odd-numbered core part, the remaining even-numbered layers are constructed at once. As a result, the conventional method requires 5 constructions, but in the present invention, the effect of shortening 100 days of 4 floors with only one construction perform

12 to 13 are schedule comparison tables comparing the schedule difference for each floor of the overall process table of the conventional conventional method ( FIGS. 8 and 9 ) and the overall process table of the underground vertical member constructed every other one according to the present invention ( FIGS. 2 and 3 ). .

12, it can be seen that the total air difference (operation number 1) by the two methods is 88 days, which is 36 months compared to about 39 months, which is about 3 months, and about 8% of the total air is shortened.

The underground excavation, reverse slab, and mat construction (6~15) parts are the same in both methods.

The difference occurs from the underground vertical member, and it is due to the construction of every other underground vertical member (core part) downward in accordance with the present invention, and the construction of the remaining core part at the same time.

The last column (I) is a value minus the completion date for each floor (column E) of the existing method from the completion date for each floor (column H) according to the present invention.

From the 16th floor (39) above the ground, the difference of 88 days is fixed and continues until construction is completed.

Referring to FIG. 13 , it is shown that a schedule difference of 88 days from the 16th floor 39 (I completion date difference column) continues until completion.

14 is an S-Curve form of the overall process table of the conventional conventional method ( FIGS. 8 and 9 ) and the overall process table of the underground vertical member constructed every other one according to the present invention ( FIGS. 2 and 3 ) and FIGS. 12-13 organized in a table It is a comparative process comparison graph represented by .

Referring to FIG. 14 , the blue line indicates the existing method, and the red line indicates the method of the present invention.

Construction began on January 1, 19, and the 6th basement floor mat was poured on June 8, 2020 (lowest point in the graph).

Afterwards, the red line according to the present invention indicates that two floors have already been constructed every other one, and three floors are simultaneously constructed in one month to complete the basement vertical member and then lead to the 16th floor.

On the other hand, the blue line, which is the conventional method of construction, indicates that it takes about 4.3 months to construct the basement vertical member for each floor after the mat construction, and then leads to the 16th floor. From the 16th floor and above, the two construction methods are the same.

As described above, the difference between the existing method and the method of the present invention was compared through the process table, table, and graph.

The following is a description of a case in which some operations are performed differently in an embodiment of the present invention.

In the case of the final excavation of the 5th basement level, the basement core part is first constructed downwards on the 1st and 3rd basement floors, and after the mat is completed, the 5th basement floor is constructed, and then the 4th basement and 2nd basement floors are simultaneously constructed can be Therefore, after the mat, the remaining core part is installed twice.

In the case of the final excavation of the 4th basement floor, the basement core part is constructed downwards first on the 1st basement floor and the 3rd basement floor, and after the mat is completed, the 4th basement floor and the 2nd basement core part can be constructed at the same time. It is the same concept as the 6-story underground construction.

Since the floor height of the basement floor is not high, there are cases where the bottom two floors (for example, the 5th floor and the 6th floor) are dug at the same time, then the mat is completed and then the 5th basement slab is installed. In this case, after constructing the 6th basement slab and the 5th basement slab at the same time, construct the 5th basement core part. Therefore, after the mat, the remaining core part is installed twice.

As described above, in the case of excavating two floors with an odd number of floors or the lowest floor at the same time, some construction projects involve sequentially constructing the remaining core part twice after mat completion. Therefore, according to one embodiment of the present invention, after completing every other core part, the remaining core part is mostly completed at once, and in some constructions, the case of constructing the remaining part twice is derived.

The step table of the above embodiment is an example in which the date calculation is accurate since it is prepared by a program specializing in step table preparation. The Kant chart, which is a red bar chart in the milestone, represents a major operation that determines the total air as a critical pass of the major line. Blue bar charts indicate jobs with floats. Therefore, in order to shorten the air, the red line, which is the main line, must be shortened. A connection line including arrows connecting the bar charts of the milestone table (Relationship indicates the preceding and following relationship between tasks).

As described above, according to the characteristics of the present invention, there may be some derivative sequential core part construction depending on the characteristics of the site based on the idea of alternately completing the core part every other to shorten the construction period of the underground core part, which determines the overall construction period. It can be seen that However, unlike the sequential core part construction method, which is the existing construction method, the core part construction method partially modified based on the idea of shortening the entire construction period through the every other core part construction method according to the present invention is the spirit of the present invention. Engineers in the construction industry will be able to clearly see that it is included in the

Modes for carrying out the invention

This is the order of the vertical member construction method in the case of the 8th basement floor of the reverse perforation method alternately constructed according to an embodiment of the present invention.

The construction sequence is as follows.

mudguard

Underground column (PRD, RDC, ACT column)

Digging the 1st and 2nd basement floors

Reinforced concrete pouring on the 1st basement floor of the steel frame deck (slab pouring)

3rd floor digging

2nd basement floor slab pouring, 1st basement floor core wall column installation

4th basement floor digging

3rd basement floor slab casting

Digging the 5th basement floor

4th basement floor slab pouring, 3rd basement floor core wall column installation

digging the 6th floor

5th basement floor slab casting

7th floor digging

6th basement floor slab pouring, 5th basement floor core wall column installation

Digging the 8th basement floor and excavating the mat

7th basement floor slab pouring, 7th basement floor core wall column installation

8th basement floor mat

Remaining 8th basement, 6th basement, 4th basement, and 4th basement core wall pillars installed (4 floors simultaneous construction)

Or 2nd floor 2nd core wall column construction remaining after the 1st 2nd floor construction by adding 8 basement floors and 1st floor (2nd 2nd floor construction)

Alternatively, after the first construction of 2 floors by adding 8 basement floors and one floor, the core wall pillar construction is performed on the remaining 2 floors one by one in the second and third phases (2 floors 1 time, 1 floor 2 times total 3 times)

Alternatively, construct the remaining 3 floors one by one after the core wall pillar construction on the 8th basement floor (4 floors in total 4 times)

After the mat is poured, the remaining layers are 4 layers, and pour it in 1, 2, 3, and 4 divisions.

The following is the sequence of the vertical member construction method in the case of the 7th basement floor of the reverse perforation method alternately constructed according to an embodiment of the present invention.

mudguard

Underground column (PRD, RDC, ACT column)

Digging the 1st and 2nd basement floors

Reinforced concrete pouring on the 1st basement floor of the steel frame deck (slab pouring)

3rd floor digging

2nd basement floor slab pouring, 1st basement floor core wall column installation

4th basement floor digging

3rd basement floor slab casting

Digging the 5th basement floor

4th basement floor slab pouring, 3rd basement floor core wall column installation

digging the 6th floor

5th basement floor slab casting

Digging the 7th basement floor and excavating the mat

6th basement floor slab pouring, 5th basement floor core wall column installation

Pouring floor mat on the 7th basement floor

On the remaining floors, 7th basement, 6th basement, 4th basement, and 2nd basement

Add 7 basement floors and one floor (choose 1 from 4 basement floors or 2 basement floors)

Or 2nd floor construction from the 7th basement floor and 3 remaining floors, construction of the remaining 1st floor (3 divided constructions in total)

Alternatively, install one layer at a time and install a total of 4 times.

This is the sequence of the vertical member construction method in the case of the basement 6th floor of the reverse drilling method alternately constructed according to an embodiment of the present invention.

mudguard

Underground column (PRD, RDC, ACT column)

Digging the 1st and 2nd basement floors

Reinforced concrete pouring on the 1st basement floor of the steel frame deck (slab pouring)

3rd floor digging

2nd basement floor slab pouring, 1st basement floor core wall column installation

4th basement floor digging

3rd basement floor slab casting

Digging the 5th basement floor

4th basement floor slab pouring, 3rd basement floor core wall column installation

Excavation of basement 6th floor and excavation of mat

5th basement floor slab casting

Pouring floor mat on the 6th basement floor, pouring the core wall column on the 5th basement floor

On the remaining floors, the 6th, 4th, and 2nd basement floors,

Construction on the remaining 3 floors at the same time (1 time in total)

Alternatively, after constructing the 6th basement floor, simultaneously construct the 4th and 2nd basement floors (2 times in total)

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

Construct one layer at a time and construct a total of 3 times (3 divided constructions in total).

This is the sequence of the vertical member construction method in the case of the 5th basement floor of the reverse drilling method alternately constructed according to an embodiment of the present invention.

mudguard

Underground column (PRD, RDC, ACT column)

Digging the 1st and 2nd basement floors

Reinforced concrete pouring on the 1st basement floor of the steel frame deck (slab pouring)

3rd floor digging

2nd basement floor slab pouring, 1st basement floor core wall column installation

4th basement floor digging

3rd basement floor slab casting

Digging the 5th basement floor and excavating the mat

4th basement floor slab pouring, 3rd basement floor core wall column installation

5th basement floor mat

On the remaining floors, the 5th, 4th, and 2nd basement floors,

Simultaneous construction of the 4th and 2nd floors after the construction of the 5th basement (2 times in total)

Alternatively, construct the 5th basement floor and the 2nd basement floor at the same time and then construct the 4th basement floor (2 times in total)

The remaining 3 layers are constructed one layer at a time (3 times in total).

The following is the sequence of the vertical member construction method in the case of the fourth basement floor of the reverse perforation method alternately constructed according to an embodiment of the present invention.

mudguard

Underground column (PRD, RDC, ACT column)

Digging the 1st and 2nd basement floors

Reinforced concrete pouring on the 1st basement floor of the steel frame deck (slab pouring)

3rd floor digging

2nd basement floor slab pouring, 1st basement floor core wall column installation

Digging the 4th basement floor and excavating the mat

3rd basement floor slab pouring, 3rd basement floor core wall column installation

4th basement floor mat

On the remaining floors, the 4th and 2nd basement floors,

Simultaneous construction of the 4th basement floor and the 2nd basement floor (1 time in total)

Construct the remaining 2 layers one layer at a time (2 times in total).

Currently, most of the top-down construction is being carried out in downtown construction. With respect to the every other construction method according to the present invention, it is necessary to first design at the structural design office, and then construct the steel frame and formwork and then construct it. Therefore, the present invention can be directly applied industrially.

Claims (12)

In the construction of an underground vertical member of a building that constructs an above-ground structure that is constructed upward in parallel with the downward construction of an underground structure,
The first step of constructing the excavation and the basement slab downward;
A second step of prior construction of every other underground vertical member;
a third step of constructing every other remaining underground vertical member after the second step construction, either at the same time or twice;
A method of shortening the construction period through the construction method of every other underground vertical member, characterized in that it is constructed every other time. According to claim 1,
When the basement floor is the 6th floor,
One underground vertical member characterized in that the core part of the 1st basement, 3rd basement, and 5th floor is pre-constructed in advance while constructing the basement slab downwards, and then the core part of the 6th basement, 4th basement, and 2nd floor are simultaneously constructed. A method of shortening the construction period through the filter construction method. According to claim 1,
When the basement floor is the 5th floor,
While constructing the basement slab downward, pre-construct every other 1st basement and 3rd basement core part, and then construct the 5th basement core part and then construct the 4th basement level, but the 2nd basement core part is installed during the construction period of the 5th and 4th basement floors. A method of shortening the construction period through the construction method of every other vertical member underground, characterized in that the construction is carried out in parallel. According to claim 1,
When the basement floor is the fourth basement floor,
Air through the construction method for every other vertical member in the basement, characterized in that, while constructing the basement slab downward, the core part on the first basement floor and the third basement floor is pre-constructed every other time, and then the core part on the 4th basement floor and the core part on the 2nd basement floor are simultaneously constructed. shortening method. According to claim 1,
In the case of excavating the lowermost floor of the basement and the upper two floors at the same time,
While constructing the underground slab downward, every other core part is pre-constructed, the mat or foundation is constructed, the lowest core part and the slab of the immediately above floor are constructed, and then the remaining core part is constructed at the same time. Air shortening method. 6. The method of claim 1 to 5,
The method for shortening the construction period through the construction method for every other vertical member in the basement, characterized in that the core part to be constructed in advance every other and the remaining core part to be constructed simultaneously afterward are divided into preceding and following based on the mat pouring operation. 6. The method of claim 1 to 5,
The construction schedule of each core part, which is constructed in advance of every other above, is
It is characterized in that construction is carried out within the range of the earliest possible start date that starts after the completion of the slab of the corresponding floor and the latest finish date that is completed before the time when the remaining core part is constructed as a trailing point. A method of shortening the construction period through the construction method of every other vertical member in the basement. 6. The method of claim 1 to 5,
The underground vertical member is an air shortening method through the construction method for every other underground vertical member, characterized in that it includes a pillar connected to the core portion or the above-ground floor. According to claim 1,
The underground vertical member constructed every other one above is
While constructing the basement slab downward, the core part or column of the underground odd-numbered (or even-numbered) floor is pre-constructed. A method of shortening the construction period through the construction method of every other vertical member in the basement, characterized in that the construction is carried out twice depending on the site or site conditions. According to claim 1,
The subsequent construction of the remaining core part at once is,
A method of shortening the construction period through the construction method for every other vertical member in the basement, characterized in that after installing the reinforcing bar of the remaining underground core part as much as possible first, and then constructing it further including a method of pouring concrete at the same time, which is a subsequent process. (a) constructing a temporary retaining wall in the ground by a conventional method;
(b) installing the underground structure and the above-ground structure by driving the pillars vertically from the ground from the above-ground core and pillars constructed upward in parallel with the downward construction of the underground structure;
(c) excavating the first floor above the ground and constructing the floor, excavating the first basement and constructing the floor;
(d) excavating the remaining basement floors in order in the downward direction and constructing the floor part and at the same time constructing the basement core part of one basement floor or a plurality of basement floors first to support the above-ground core part which is preferentially constructed upward;
(e) preferentially constructing the above-ground core in the upper direction on the upper part of the basement core to be constructed first, and installing the basement frame in the downward direction in parallel with this;
(f) in the step of installing the basement frame in the downward direction, first constructing the core part of the first basement floor, and then installing the core part after every other one;
(g) after the basement frame is completed to the foundation part, forming the foundation, and installing the core part of the remaining floor to be constructed downwardly every other one from the lowest floor to the upper floor, simultaneously or sequentially, to the core part of the basement that was first constructed;
(h) including the steps of constructing the construction completion through the remaining framing work of the ground floor and the final work, the finishing work,
The underground core part is constructed first or at the same time as possible within a certain possible range, so that the construction period is shortened by excluding it from the critical path of the main line. 12. The method of claim 11,
The step of installing the core part after every other includes constructing the core part of the odd-numbered layer, the core part of the remaining layer includes the core part of the even-numbered layer, and the odd-numbered layer and the even-numbered layer core part are converted based on the mat construction, A method of shortening the construction period through the construction method of every other vertical member in the basement, characterized in that it includes the case where the lowermost core part and the upper core part are sequentially constructed according to site characteristics.

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