KR20220039337A - Construction method of prefabricated mat foundation system - Google Patents

Abstract

The present invention relates to a method of constructing a prefabricated mat foundation system. The method includes the following steps of: (S100) arranging a lower rebar (100); (S200) placing a foundation reinforcement material (200) in an upper part of the arranged lower rebar (100) by using a crane (C); (S300) installing a plurality of modular bar chairs (300) by using the crane (C); (S400) arranging an upper rebar (400) in an upper part of the modular bar chairs (300); and (S500) forming a foundation by placing concrete. Thus, the foundation reinforcement material (200) and the modular bar chairs (300) are prefabricated in a factory and transported in an integrated state, and then, the components are assembled to be constructed in a site through a crane, and, accordingly, the present invention is capable of reducing output personnel and significantly shortening the construction period in comparison to an existing onsite construction scheme, which can lead to a reduction in construction costs.

Description

Construction method of prefabricated mat foundation system

The present invention relates to a method of constructing a prefabricated mat foundation system, and more particularly, to a method of constructing a prefabricated mat foundation system in which a foundation reinforcement and a modular bar chair are disposed on top of a lower reinforcing bar using a crane.

The foundation work of a building structure is a work that firmly stabilizes the bottom of the structure so that it can safely support the load acting on the structure or the weight of the structure. Therefore, the simplification of the foundation and the reduction of the construction period through the pre-assembly of members correspond to the core tasks in the foundation construction.

The foundation of a building structure can be largely divided into a mat foundation or raft foundation and an independent footing or individual footing. is started, so it is realistically impossible to pour concrete at once when constructing the front foundation. Therefore, in the field, it is common to calculate the amount of concrete that can be poured on the same day, divide the pouring area, and then pour it separately by area.

등 다수의 구역으로 구획하여 시공성을 향상시키고 있으나, 이 같은 방식은 시공이음이 많이 발생하고, 하나의 구역에서 적어도 둘 이상의 측면에 거푸집을 설치하여야 하는 경우가 많아, 거푸집의 설치 및 해체에 따른 시간이 많이 소요된다는 문제점이 있다.At this time, in order to separate pouring of concrete, the formwork is installed in advance along the partitioned area, and after pouring and curing the concrete, the formwork is removed and carried out again. In particular, the conventional installation of general formwork is a labor-intensive process that goes through a series of processes such as material loading, loading, assembly installation, demolding, and material unloading. occurs frequently. In particular, in the case of a site with a large total foundation area, this

The constructability is improved by dividing it into a number of zones, such as, but this method causes a lot of construction joints, and in many cases it is necessary to install the formwork on at least two or more sides in one area, so the time required for the installation and dismantling of the formwork There is a problem that this takes a lot.

In addition, punching shear reinforcement is performed by additionally reinforcing shear reinforcing bars bound to the upper and lower reinforcing bars in the foundation. It is difficult to secure the homogeneity of construction because it is dependent on the skill level of

In addition, a reinforcing bar support structure called a chair bar, bar chair or spacer is installed on the upper part of the lower reinforcing bar, and the top rebar is placed on the upper part spaced apart from the lower reinforcing bar by a certain distance, and the foundation is established by pouring concrete. At this time, the reinforcing bar support structure takes a considerable amount of time to install, and buckling of the member occurs easily during work, so it is often not possible to support the structure as designed. There is a problem that safety accidents occur frequently because of this input. Therefore, there has been a demand for a reinforcing bar support structure that has a simple manufacturing and installation process and that has sufficient stability.

In the end, the construction of the front foundation divides the entire foundation area into a plurality of zones, and in each zone, a series of processes such as formwork installation, shear reinforcement, individual bar chair installation, and concrete pouring followed by demolding of the formwork are performed. There is a need for a foundation construction method that can shorten the construction period as much as possible and secure stability.

The present invention has been devised to solve the above problems, and when constructing a mat foundation for a large structure, the factory-manufactured foundation reinforcement and modular bar chair are integrally transported using a crane and installed at the site to ensure worker safety. It is an object of the invention to provide a construction method of a prefabricated mat foundation system that secures and dramatically reduces the number of output personnel and construction period.

In order to solve the above problems, the construction method (M) of the prefabricated mat foundation system of the present invention includes the steps of reinforcing the lower reinforcing bar 100 (S100); Placing the foundation reinforcement 200 using a crane (C) on the upper portion of the reinforced lower reinforcing bar 100 (S200); Installing a plurality of modular bar chair 300 using a crane (C) (S300); Reinforcing the upper reinforcing bar 400 on the upper part of the modular bar chair 300 (S400); and pouring concrete to form a foundation (S500).

In addition, the modular bar chair 300 installation step (S300) includes: forming a first modular bar chair line by continuously arranging a plurality of modular bar chairs 300 along one direction (S310); and forming a plurality of modular bar chair lines by continuously disposing a plurality of modular bar chairs 300 in parallel with the first bar chair line (S320).

In addition, the modular bar chair line located on the outer side of the plurality of modular bar chair lines may be constructed by zone by installing the modular bar chair 300 coupled with the form 350 to the outside.

In addition, before the lower reinforcing bar 100 reinforcement step (S100), an excavation step (S000) of excavating the strata corresponding to the entire foundation area by an open cut method so that the excavation section maintains a stable slope; may include more.

In addition, the step of arranging the base reinforcement 200 (S200), the step of providing a support guide 230 to correspond to the position of the pillar (S210); And a shear reinforcement body 210 to which the vertical reinforcing bar assembly 220 is integrally coupled to the upper portion of the reinforced lower reinforcing bar 100 by using a crane C is provided on the upper portion of the support guide 230 to position It may include; and at the same time placing it on the floor and spaced apart from the floor by a predetermined distance (S220).

In addition, a mechanical anchorage 224 may be coupled to the lower end of the vertical reinforcing bar 221 for joints of the vertical reinforcing bar assembly 220 .

In addition, the modular bar chair 300 installation step (S300) includes the steps of adjusting the horizontal position and vertical height of the interference prevention device 360 provided in the lower part of the modular bar chair 300 (S320); and disposing the modular bar chair 300 so as not to interfere with the lower reinforcing bar 100 (S330).

In addition, before the horizontal position and vertical height adjustment step (S320), the step of temporarily disposing the modular bar chair 300 on the upper portion of the lower reinforcing bar 100 (S310); may further include.

In addition, the step of adjusting the horizontal position and vertical height of the interference prevention device 360 (S320), the step of moving the height adjustment bar screwed to the nut body of the interference prevention device 360 in the vertical direction (S321) ; and moving the nut body 361 guided by the movement guide piece 363 of the interference prevention device 360 in the horizontal direction (S322).

The construction method of the prefabricated mat foundation system according to the present invention prefabricates the foundation reinforcement and the modular bar chair at the factory, transports them in one piece, and then constructs it in a prefabricated manner using a crane at the site, compared to the conventional field construction method. It is possible to reduce the number of people and dramatically shorten the construction period, and thus the construction cost can also be reduced.

In addition, as in the present invention, the mat foundation construction method consisting of on-site assembly type after factory production as in the present invention can significantly lower the risk of occurrence of safety accidents for workers compared to the conventional on-site construction method, and constant construction without being significantly affected by the skill level of the operator It has the advantage of ensuring quality and speed.

Specifically, by dividing the entire foundation area in one direction after excavating the foundation with the open cut method, the installation area of the formwork can be reduced, and the inflow of groundwater into the building can be minimized by minimizing the construction joint caused by the time lag separate pouring. can be reduced

In addition, by installing the modular bar chair in which the bar chair and the formwork are integrally formed on the outermost side of each zone, a separate formwork installation process becomes unnecessary. The process can be omitted, and the surplus water is discharged through the ribs to keep the concrete with high strength, and it has the advantage that it can be used as a construction joint of a mat foundation.

In the case of a basic reinforcement, a plurality of reinforcing plates are combined in an upright state to form a lattice-shaped shear reinforcement, and a vertical reinforcement assembly formed by assembling a plurality of vertical reinforcement for joints in the space of the shear reinforcement is integrated. By arranging the foundation reinforcement combined with a crane in the field using a crane, the construction efficiency is improved, and the construction period can be shortened and the cost reduction effect can be brought.

In addition, a mechanical anchorage is combined at the bottom of the vertical reinforcing bar for joints to bind horizontal reinforcing bars after the shear reinforcement is mounted, and a supporting guide is provided on the upper part of the floor to correspond to the position of the column, and the vertical reinforcing bar assembly is integrated The combined shear reinforcement body is mounted on the upper part of the support guide to guide the shear reinforcement body to the correct position and at the same time spaced apart from the floor at a certain distance to solve the interference with the lower reinforcing bar.

In addition, an interference prevention device is additionally provided in the lower part of the bar chair to prevent interference with the pre-constructed lower reinforcing bar and to improve the overall workability of the modular bar chair.

Figures 1a, 1b and 1c is a block diagram showing the construction method of the prefabricated mat foundation system of the present invention in time series.
Figure 2 is a conceptual diagram showing a construction site according to the construction method of the prefabricated mat foundation system of the present invention.
3 is a plan view showing the entire base area divided into a plurality of zones;
Figures 4a and 4b is a perspective view showing the foundation reinforcement of the present invention, and a view showing a site for arranging the foundation reinforcement using a crane.
Figure 5 is a conceptual view showing the principle of assembling a mechanical anchorage in the vertical reinforcing bar assembly of the present invention.
Figure 6 is a side view showing a state in which the base reinforcement of the present invention is installed.
Figure 7 is a conceptual view showing the principle of placing the vertical reinforcing bar assembly in place through the support guide according to an embodiment of the present invention.
Figures 8a and 8b is a perspective view showing the modular bar chair of the present invention and a view showing a site for arranging the modular bar chair using a crane.
Figure 9 is a perspective view showing a bar chair of the present invention.
Figure 10 is a view showing an anti-interference device of the present invention.

Hereinafter, before describing in detail through preferred embodiments of the present invention, terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and meanings consistent with the technical spirit of the present invention and should be interpreted as a concept.

Throughout this specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, a preferred embodiment of the present invention will be described in detail based on the accompanying drawings. The same reference numerals are used for the same components in the drawings, and repeated descriptions of the same components are omitted.

1a to 1c is a block diagram showing a time series sequence of the prefabricated mat based system construction method (M) according to an embodiment of the present invention.

Referring to Figure 1a, the construction method (M) of the prefabricated mat foundation system according to the present invention, the step of reinforcing the lower reinforcing bar 100 (S100); Placing a foundation reinforcement by using a crane (C) on the upper portion of the reinforced lower reinforcing bar 100 (S200); Installing a plurality of modular bar chairs using a crane (C) (S300); Reinforcing the upper reinforcing bar 400 on the upper part of the modular bar chair (S400); and pouring concrete to form a foundation (S500). As such, in the mat foundation construction using the construction method (M), the number of output personnel and the construction period can be drastically reduced by transporting the foundation reinforcement and the modular bar chair manufactured in the factory together using a crane and installing it on the site. This has the advantage of lowering the risk of safety accidents. Hereinafter, each step of the construction method (M) will be described in detail.

First, the construction method (M) of the prefabricated mat foundation system according to the present invention is excavated by excavating the stratum corresponding to the entire foundation area by an open cut method before the lower reinforcing bar 100 reinforcement step (S100). It may further include; an excavation step (S000) to maintain this stable slope.

The stratum excavation step (S000) refers to excavation work of excavating the stratum of the corresponding area to form the foundation of the building, as shown in FIG. 2 . Depending on the area or height of the foundation, the nature or shape of the soil, etc., the earth anchor method, island cut method, trench cut method, etc. can be used to dig. Considering that, it can be excavated using the open cut method, which excavates the ground so that the slope, which is a stable gradient, is maintained. When the open cut method is applied, the construction cost is low and the construction period can be shortened because concrete can be poured directly without a formwork.

After the geological excavation step (S000), as shown in FIG. 3, the entire foundation area is divided into a plurality of zones in consideration of the daily pouring amount of concrete, and formwork installation, reinforcement, and separate pouring of concrete are performed for each zone. .

형태가 아닌,

형태로 전체 기초면적을 일방향으로만 구획하여, 거푸집 필요면적을 감소시켜 출력인원 및 공사기간을 감축시킬 수 있으며, 시공이음을 최소화하여 기초 시공 후 지하수가 건물 내로 유입되는 것을 최대한 억제할 수 있다.In this case, the division method is

not form,

By dividing the entire foundation area in one direction only, the number of people to output and the construction period can be reduced by reducing the area required for the formwork.

In addition, after the stratum excavation step (S000), by pouring the discarded concrete to the excavated stratum, it is possible to increase the workability of the foundation construction, and the discarded concrete pouring can be performed for the entire foundation surface.

The step (S100) of reinforcing the lower reinforcing bar 100 is a process of reinforcing reinforcing bars in the lower part of the foundation to reinforce the tensile force. , it is possible to reduce the number of people outputting and shorten the construction period, and it has the advantage of improving the construction quality because it is possible to arrange reinforcement at uniform intervals. Rebar roll mat construction may be performed in the same manner in the upper reinforcing bar 400 reinforcement step (S400) to be described later.

Next, with reference to FIGS. 1b, 4a and 4b, the step (S200) of arranging the foundation reinforcement 200 on the upper portion of the foundation reinforcement 200 and the lower reinforcement 100 will be described in detail.

Figure 1b is a block diagram showing the foundation reinforcement 200 arrangement step (S200) in time series, Figure 4a is a perspective view showing the foundation reinforcement material 200, Figure 4b is a site for arranging the foundation reinforcement material using a crane is a diagram showing

First, the base reinforcement 200 is formed by integrally combining the shear reinforcement 210 and the vertical reinforcement assembly 220 as shown in FIG. 4A .

In the shear reinforcement body 210, a plurality of reinforcement plates 211 are coupled in an upright state to form a lattice structure, and the reinforcement plate 211 is a plurality of reinforcement plates 211 having different directions coupled to each other. Thus, it can be formed in a lattice shape. For example, a plurality of reinforcing plates 211 spaced apart at regular intervals in the first direction may be provided, and a plurality of reinforcing plates 211 spaced at regular intervals in a second direction perpendicular to the first direction may be provided, As a result, the load applied to the upper portion of the shear reinforcement body 210 is distributed to the outside in all directions, so that the bearing capacity and stability can be further improved.

At this time, it is preferable that the overlapping portions of the reinforcing plates 211 in different directions are coupled by welding or bolting by a backing plate, and even when forming one reinforcing plate 211 , a plurality of plates are added to the backing plate. can be combined using In addition, a plurality of stud bolts 216 are coupled to the reinforcing plate 211 in a normal direction to reinforce the bonding force with the concrete to be poured.

Furthermore, fixing flanges 213 are coupled to both ends in the longitudinal direction of each of the reinforcing plates 211 forming the shear reinforcement 210 , and the steel bars 214 are formed along the longitudinal direction of the reinforcing plate 211 . It may be provided so that both ends are fixed to the fixing flange 213 . In addition, an opening 215 convex toward the center may be formed in the lower portion of each reinforcing plate 211 to form an arcuate structure as a whole. Accordingly, the load applied to the upper portion of the shear reinforcement body 210 can be transmitted downward along the arcuate structure of the reinforcement plate 211, and at the same time, the deformation load applied to the outside of the shear reinforcement body 210 is the steel bar ( 214), so it is possible to provide a structurally excellent shear reinforcement 210.

In the base reinforcement 200 of the present invention, a space portion 212 is provided in the center in forming the shear reinforcement body 210 using the reinforcement plate 211, and a plurality of vertical reinforcement bars 221 for joints are assembled. The formed vertical reinforcing bar assembly 220 may be integrally coupled while being provided in the space portion 212 . As a result, construction can be accomplished only by arranging the foundation reinforcement 200 in which the vertical reinforcing bars for joints are integrated at the site using a crane (C), and the process of reinforcing the vertical reinforcing bars for joints can be omitted. By shortening the construction period and reducing the number of output personnel, it is possible to secure the economic feasibility and efficiency of the foundation construction. The shear reinforcement body 210 and the vertical reinforcing bar assembly 220 disposed in the space 212 may be integrated by direct welding or bolting, and the vertical reinforcing bar assembly 220 will be described in detail below.

The vertical reinforcing bar assembly 220 may include a plurality of vertical reinforcing bars 221 for joints along the tie frame 222 having a shape corresponding to the cross section of the column. The standard of the tie frame 222 is preferably formed so that an appropriate coating thickness is secured to the outside of the vertical reinforcing bar 221 for joints in forming the column.

A plurality of vertical reinforcing bars 221 for joints are coupled by welding along the inner circumferential or outer circumferential surface of the tie frame 222, or a plurality of vertical reinforcing bars 221 for splicing are provided and fixed to pass through the tie frame 222. can be produced At this time, the tie frame 222 is formed in plurality in the vertical direction to achieve solid integration, and as shown in FIG. 5 , the vertical frame 223 is additionally coupled between the vertically adjacent tie frames 222 . can

In addition, as shown in FIG. 5, a mechanical anchorage 224 may be assembled at the lower end of the vertical reinforcing bar 221 for the joint. The mechanical anchorage 224 is preferably a truncated cone-shaped anchorage referred to as an enlarged head reinforcing bar. That is, by combining the mechanical anchorage 24 to the vertical reinforcing bars 21 for individual joints of the vertical reinforcing bar assembly 20 in advance prior to placement using the crane (C), the lower reinforcing bars 100 and By resolving the interference between the vertical reinforcing bars 221 for joints, construction efficiency is achieved, and a sufficient anchorage length is ensured after arrangement.

The support guide 230 is provided in advance on the upper part of the floor to correspond to the position of the pillar as shown in FIG. By mounting on the upper part of the 230), the shear reinforcement body 210 can be guided to the correct position, and since the shear reinforcement body 210 is spaced apart from the floor by a predetermined distance by the support guide 230, the lower reinforcing bar 100 and interference can also be eliminated.

A support guide 230 according to an embodiment is provided with a plurality of guide members 231 having a guide ball 231a formed thereon as shown in FIG. 7 , and the vertical reinforcing bar assembly 220 includes the guide ball ( 231a), a plurality of guide pins 225 may be formed to protrude downward. That is, if the support guide 230 is provided to correspond to the position of the pillar, the guide pin 225 of the vertical reinforcing bar assembly 220 integrated in the process of arranging the shear reinforcement body 210 using the crane (C). By inserting the guide member 231 into the guide ball 231a through the medium, the weight of the base reinforcement 200 can be stably seated in the correct position within the error range.

At this time, the inner circumferential surface of the guide member 231 is formed to have a tapered cross-section that is inclined inwardly downward toward the guide hole 231a, so that the guide pin 225 is only arranged using a crane C without assistance by manpower. Since it can be naturally inserted into the guide hole 231a along the inner circumferential surface of the guide member 231, unnecessary consumption of manpower can be omitted, and construction efficiency can be significantly improved.

On the other hand, in the reinforcing bar integrated foundation reinforcement 200 capable of crane (C) construction of the present invention, the supporting guide 230 may be disposed after the lower reinforcing bar 100 , but after disposing the supporting guide 230 , the lower reinforcing bar It is also possible to provide (100). However, an embodiment in which the lower reinforcing bar 100 is omitted at the position of the support guide 230 for construction efficiency is also possible.

Although not shown in the drawings, in this case, the vertical reinforcing bar assembly 220 and the lower reinforcing bar assembly are integrated based on the crane C by additionally binding the lower reinforcing bar assembly in a shape corresponding to the lower portion of the shear reinforcement 210 . A shear reinforcement 210 may be disposed. Furthermore, it is also possible to additionally bind the upper reinforcing bar assembly.

When the lower reinforcing bar assembly 240 and the upper reinforcing bar assembly 250 are integrated, reinforcement is possible except for this part in the reinforcement process, so the advantage of easy reinforcement without interference with the foundation reinforcement 200 is exhibited.

The foundation reinforcement 200 may be disposed using a crane (C) where the column is located, in a state in which the shear reinforcement 210 and the vertical reinforcing bar assembly 220 are integrally coupled as described above, and the shear reinforcement is installed in the field. Compared to the conventional method of assembling and arranging, it can bring the effects of improvement of construction efficiency, shortening of construction period and cost reduction.

Hereinafter, referring to the installation method of each base reinforcement 200 in detail, as shown in FIG. 1B , it may include a step of providing a support guide ( S210 ) and a step of arranging a shear reinforcement ( S220 ). The step of providing the support guide ( S210 ) is a step of providing the support guide 230 on the floor to correspond to the position of the pillar. The support guide 230 serves to guide the shear reinforcement body 210 to which the vertical reinforcing bar assembly 220 is integrally coupled to the original position and to space it apart from the floor by a predetermined distance.

The supporting guide providing step S210 may be performed after the lower reinforcing bar 100 is reinforced, but the lower reinforcing bar 100 reinforcing step may be performed after the supporting guide 230 is provided.

On the other hand, the support guide 230 is provided with a plurality of guide members 231 having guide balls 231a formed thereon, so that the guide pins 225 of the vertical reinforcing bar assembly 220, which will be described later, are mounted on the guide members 231 of the guide pin 225 . It may be inserted into the guide ball (231a). In addition, the inner circumferential surface of the guide member 231 is formed to have a tapered cross section that is inclined downwardly inward toward the guide hole 231a, so that the guide pin 225 naturally rides on the inner circumferential surface of the guide member 231 and guides the guide hole. (231a) can be inserted.

In the shear reinforcement arrangement step (S220), the shear reinforcement body 210 to which the vertical reinforcing bar assembly 220 is integrally coupled is provided on the upper portion of the support guide 230 using a crane C to reinforce the shear. Interference with the lower reinforcing bar 100 can be avoided by disposing the sieve 210 in the correct position and at the same time spaced apart from the floor by a certain distance.

In addition, as described above, since a plurality of guide pins 225 may be formed to protrude downwardly at a position corresponding to the guide ball 231a in the vertical reinforcing bar assembly 220, shear reinforcement using a crane C In the process of arranging the sieve 210, by inserting the guide pin 225 of the integrated vertical reinforcing bar assembly 220 into the guide ball 231a via the guide member 231, the weight of the base reinforcement 200 is within the error range. It can be stably seated in the correct position within.

On the other hand, by coupling the mechanical anchorage 24 to the vertical reinforcing bars 21 for individual joints of the vertical reinforcing bar assembly 20 in advance before the shear reinforcement arrangement step (S220), a sufficient anchorage length is ensured. Accordingly, in the construction process, the interference between the lower reinforcing bar (BR) and the vertical reinforcing bar (21) for joint use can be eliminated to achieve construction efficiency.

Next, with reference to FIGS. 1c, 8a and 8b, the step of installing the modular bar chair 300 and the plurality of modular bar chairs 300 using the crane C (S300) will be described in detail.

Figure 1c is a block diagram showing the modular bar chair installation step (S300) in time series, Figure 8a is a perspective view showing the modular bar chair 300, Figure 8b is a lower reinforcing bar 100 using a crane It is a view showing a site for placing the modular bar chair 300 on the upper part of the.

First, the modular bar chair 300 is pre-assembled at a factory, transported and installed integrally, and as shown in FIG. 8A , a plurality of first bar chairs 310a, a plurality of second bar chairs 310b and a horizontal material (320).

The bar chairs 310a and 310b may include at least three or more vertical members and a horizontal member connecting the vertical members to each other. In this case, the vertical member may be preferably arranged in parallel with the four L-shaped steels spaced apart. In addition, a horizontal member for preventing vertical buckling of the vertical members and connecting the vertical members may be further included, and the horizontal member may be coupled by welding at a node with the vertical member.

In addition, by disposing a brace connecting another node where the vertical member and the horizontal member meet in the diagonal direction of the node where the vertical member and the horizontal member meet of the bar chairs 310a and 310b, they can be welded.

As shown in FIG. 8A , the bar chairs 310a and 310b may be divided into a first bar chair 310a or a second bar chair 310b according to their arrangement positions. First, a plurality of first bar chairs 310a are arranged to be spaced apart in a row in the longitudinal direction, and at a predetermined distance from the lateral side of the first bar chair 310a at positions corresponding to the first bar chairs 310a. A plurality of second bar chairs 310b are disposed, and a horizontal member 320 is adjacent to the first bar chair 310a or the second bar chair 310b in the transverse or longitudinal direction. And the second bar chair 310b is horizontally coupled to each other.

의 평면상 사각형 형태를 이루도록 구비될 수 있다.At this time, there is no limit to the number of the first bar chair 310a and the second bar chair 310b, but preferably the modular bar chair 300 is

It may be provided so as to form a rectangular shape on the plane of.

The horizontal member 320 is adjacent to the first bar chair 310a adjacent to the first bar chair 310a, the second bar chair 310b adjacent to the first bar chair 310a, or the second bar chair 310b adjacent to the first bar chair 310a. It is a member for coupling the second bar chair 310b to each other in the horizontal direction.

The horizontal member 320 may preferably be selected as a section steel, and after being provided on the same upper and lower sides of the adjacent bar chair, each tag is welded to the vertical member of the bar chair in the outer direction of the modular bar chair 300 . The bar chairs can be combined with each other. As such, the horizontal member 320 not only serves to additionally secure horizontal support, but also connects a plurality of first and second bar chairs to form one modular bar chair 300 .

The modular bar chair 300 as described above is pre-fabricated in a factory rather than assembled on-site with individual bar chairs and horizontal members 320, the first bar chair 310a and the second bar chair 310b By placing and combining the horizontal member 320 between the bar chairs to form a module in a pre-assembled state, by integrally transporting the modular bar chair 300 to the site and installing it integrally using a crane (C), It will be possible to dramatically reduce the number of people printing and the construction period. In particular, by replacing the chair bar installation process, which has a high work risk, with the installation of the modular bar chair 300 using a crane (C), it is possible to reduce costs and sufficiently secure the safety of the workers.

Referring to FIG. 8A , the modular bar chair 300 according to the present invention includes a first bar chair 310a or a first bar chair 310a adjacent to the first bar chair 310a or the second bar chair 310b in the transverse or longitudinal direction, and It may include a brace 330 for diagonally coupling the second bar chair 310b.

Bracing 330 is disposed on the upper and lower portions of the vertical member of one bar chair, the lower and upper portions of the adjacent vertical member of the bar chair, and is tag welded to form an X-shape, to be installed on the same plane as the horizontal member 320 . can As such, by adding and installing a brace 330 to the bar chair and the horizontal member 320, the vertical and horizontal support forces applied to the modular bar chair 300 are further strengthened, and vertical buckling can be effectively prevented, and the modular bar chair (300) makes it possible to more stably support the upper basal muscle.

Next, referring to FIG. 8A , the upper portions of the plurality of first bar chairs 310a are coupled by a first support yoke 340a provided in the longitudinal direction, and the upper portions of the plurality of second bar chairs 310b are disposed in the longitudinal direction. It may be coupled by the second support yoke (340b) provided with. The first and second support holes may be provided with a C-shaped steel, and are welded or bolted to the center of the upper end of the bar chair to connect a plurality of bar chairs and serve to support the upper base of the base.

Next, with reference to FIGS. 9 to 10 , the interference prevention device 360 will be described in detail. 9 is a view showing a state in which the interference prevention device 360 is provided in the bar chair, FIG. 10a is a perspective view of the interference prevention device 360, and FIG. 10b is the nut body 361 of the interference prevention device 360. , a view showing a state in which the height adjustment bar 362 and the bracket 364 are coupled, and FIG. 10c is a front view of the interference prevention device 360 .

The modular bar chair 300 according to the present invention may include an anti-interference device 360 comprising a nut body 361 , a height adjustment bar 362 , and a movement guide piece 63 .

Since the modular bar chair 300 includes a plurality of bar chairs, interference with the previously installed lower reinforcing bar 100 may occur during the installation process, and if the height of the discarded concrete is not constant, the modular bar chair (300) is not seated correctly, a problem may occur in the overall structural stability. Therefore, the modular bar chair 300 according to the present invention is provided with an interference prevention device 360 to prevent interference with the lower reinforcing bar 100 , and to allow the modular bar chair 300 to be seated on the lower reinforcing bar 100 . Horizontal position and vertical height can be adjusted.

Looking at the configuration of the interference prevention device 360 in detail with reference to FIGS. 10A to 10C , the nut body 361 has a screw thread formed on the inner circumferential surface of the hollow, and the nut body has a height adjustment bar made of spiral reinforcing bars. 362 may be provided to be movable in the vertical direction by being screwed. That is, by adjusting the vertical height of the height adjustment bar 362 and protruding to the lower part of the bar chair, it is possible to prevent interference with the lower reinforcing bar 100 in the process in which the modular bar chair 300 is seated, and discard the lower part. Even when the concrete layer is uneven, the entire structure can be stably supported by adjusting the height.

The nut body 361 is formed of an upper body 361a and a lower body, and may be composed of a reinforcing bar coupler capable of selectively fastening and releasing, and a movement guide piece 363 between the upper and lower bodies 361a and 361b. This may be provided to enable selective fastening and release of the nut body 361 .

In addition, the movement guide piece 363 has the flange of the C-shaped cross-section member facing the upper part and the open part provided at the lower part, and is coupled at the lower part of the first bar chair 310a and the second bar chair 310b and the nut The body 361 may be guided to move in the horizontal direction, and for this purpose, a rail ball 363a in the form of a long hole may be provided on the flange of the movement guide piece 363 .

The movement guide piece 363 may be coupled between two vertical members adjacent in a right angle direction among the plurality of vertical members of the bar chair, but preferably, as shown in FIG. 9 , between two vertical members positioned in a diagonal direction. It is coupled to the bar chair so that it is not biased toward one side of the bar chair, supports the bar chair stably in the central part, and prevents interference with the lower muscles. In particular, since the height adjustment bar 362 moves along the movement guide piece 363 arranged in the diagonal direction, there is an advantage that can simultaneously avoid interference with the lower reinforcing bar 100 that is reinforced in the longitudinal and transverse directions.

The step (S300) of installing a plurality of modular bar chairs 300 using a crane C is performed by continuously disposing a plurality of modular bar chairs 300 along one direction as shown in FIG. 1C. 1 Forming a modular bar chair line (S310); and continuously disposing a plurality of modular bar chairs 300 in parallel with the first modular bar chair line to form a plurality of bar chair lines (S320). In this case, an appropriate number of modular bar chair lines may be formed according to the area of the partitioned area, and the modular bar chair 300 may be arranged so as to be parallel to the line dividing the base area into a plurality of zones.

On the other hand, as shown in FIG. 8B , a modular bar chair 300 with a mold 350 coupled to the outside is installed in a bar chair line located outside one side of a plurality of modular bar chair lines, so that construction by area is possible. Do.

8A and 8B , in the modular bar chair 300 according to the present invention, the formwork 350 is coupled in the longitudinal direction from the outer surface of the first bar chair 310a or the second bar chair 310b. can be That is, in the process of front foundation construction that requires separate pouring of concrete, the necessary modular bar chair 300 and the form 350 are integrated, so that the function of the bar chair or chair bar and the function of the form 350 can be expressed at the same time. It is possible to reduce the number of output personnel required to install the formwork 350, and greatly shorten the construction period.

In particular, when the formwork 350 is formed of Rib-Lath, the concrete can be maintained at high strength due to the discharge of surplus water, and the process of removing and carrying out the form 350 after installing it is omitted. And by using it as a construction joint of the mat foundation, which will be described below, the period required for the formwork process, which greatly affects the entire foundation construction period, can be further shortened. The rib brass formwork 350 is manufactured in a modular form outside the construction site, and the rib brass is welded to the frame pre-assembled using a section steel, and is combined with the manufactured modular bar chair 300 and transported to the construction site as an integral part. can be installed.

A water expansion index material 351 may be further provided on one side of the formwork 350 in the longitudinal direction. In the process of separating and pouring the front foundation of a large building for each division, a construction joint is generated between the old concrete and the new concrete. The joint prevents groundwater from entering the building.

As the water stop material, it is common to install a rubber water stop plate having a width of 20 cm, but when the water expansion stop material 351 (Swelling water stop) is installed, it can be prevented from being bent or damaged during concrete pouring or transportation. there is. In addition, when the water expansion index material 351 is integrated into the pre-assembled modular bar chair 300 from the manufacturing stage, there is an advantage that a separate additional operation can be omitted in the field.

Next, looking at the installation method of one modular bar chair 300, as shown in FIG. 1c, the horizontal position and vertical height of the anti-interference device 360 provided at the lower part of the modular bar chair 300 adjusting (S320); and disposing the modular bar chair 300 so as not to interfere with the lower reinforcing bar 100 (S330).

As described above, the modular bar chair 300 is pre-assembled at a factory and transported as an integral vehicle. The jig may be coupled to the modular bar chair 300 .

In installing the modular bar chair 300, before the step of adjusting the interference prevention device 360, a step (S310) of temporarily arranging the modular bar chair may be performed, which is the crane (C) using the jig. In a step of lifting the modular bar chair 300 and then spaced apart by a predetermined interval from the upper part of the lower reinforcing bar 100, the horizontal position of the anti-interference device 360 and the nut body 361 and the vertical height of the bolt are installed It can be precisely adjusted at the position, thereby increasing the placement accuracy of the modular bar chair 300 and increasing the stability of the structure.

In the step (S320) of adjusting the horizontal position and vertical height of the interference prevention device 360, the height adjustment bar 362 screwed to the nut body 361 of the interference prevention device 360 is moved in the vertical direction. making (S321); and moving the nut body 361 guided by the movement guide piece 363 of the interference prevention device 360 in a horizontal direction (S322). As such, by adjusting the height of the bar chair included in the modular bar chair 300 in the horizontal and vertical directions to suit each ground condition, the modular bar chair 300 can be stably seated and support the upper basal muscles. make it possible

On the other hand, the horizontal position adjustment step (S321) and the vertical height adjustment step (S322) can be flexibly changed in order according to site conditions or work conditions. That is, it is also possible to adjust the vertical height in advance to correspond to the height of the lower reinforcing bar 100, and to adjust the vertical height after provisional arrangement.

The nut body 361 may be manufactured as a reinforcing bar coupler as a thread is formed on the inner circumferential surface of the sleeve-type body, and the height adjustment bar 362 may be made of a threaded bolt or reinforcing bar.

After disposing the base reinforcement 200 (S200) and installing the modular bar chair 300 (S300), the step of reinforcing the upper reinforcing bar 400 on the upper part of the modular bar chair 300 (S400) ; and pouring concrete to form a foundation (S500).

The construction method of the prefabricated mat foundation system according to the present invention described above, those of ordinary skill in the art to which the present invention pertains, can be implemented in other specific forms without changing the technical spirit or essential features of the present invention you will understand

Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive, and the scope of the present invention is indicated by the following claims rather than the foregoing detailed description, the meaning and scope of the claims, and All changes or modifications derived from the concept of equivalents should be construed as being included in the scope of the present invention.

S000: excavation stage S100: lower reinforcement stage
S200: Step of placing the foundation reinforcement S210: Step of providing the support guide
S220: Shear reinforcement body placement step S300: Modular bar chair installation step
S310: Modular bar chair temporary placement stage
S320: Step of adjusting the horizontal position and vertical height of the anti-interference device
S321: Step of vertical movement of the height adjustment bar
S322: nut body horizontal movement step S330: modular bar chair arrangement step
S400: upper reinforcement step S500: foundation formation step
100: lower reinforcing bar 200: foundation reinforcement\
210: shear reinforcement 211: reinforcement plate
212: space portion 213: fixing flange
214: steel bar 215: opening
216: stud bolt 220: vertical reinforcing bar assembly
221: vertical reinforcement for joints 222: tie frame
223: vertical frame 224: mechanical anchorage
225: guide pin 230: support guide
231: guide member 240: lower reinforcing bar assembly
300: modular bar chair 310a: first bar chair
310b: second bar chair 320: horizontal member
330: brace 340a: first yoke
340b: second yoke 350: formwork
351: water expansion index material 360: interference prevention device
361: nut body 361a: upper body
361b: lower body 362: height adjustment bar
363: movement guide piece 363a: rail ball
364: bracket 400: upper reinforcing bar

Claims (9)

In the method of constructing a mat foundation of a building structure,
Reinforcing the lower reinforcing bar 100 (S100);
Placing the foundation reinforcement 200 using a crane (C) on the upper portion of the reinforced lower reinforcing bar 100 (S200);
Installing a plurality of modular bar chair 300 using a crane (C) (S300);
Reinforcing the upper reinforcing bar 400 on the upper part of the modular bar chair 300 (S400); and
Forming a foundation by pouring concrete (S500);
Construction method of the prefabricated mat foundation system, characterized in that it comprises.
According to claim 1,
The plurality of modular bar chairs 300 installation step (S300),
forming a first modular bar chair line by continuously arranging a plurality of modular bar chairs 300 along one direction (S310); and
Forming a plurality of modular bar chair lines by continuously arranging a plurality of modular bar chairs 300 in parallel with the first bar chair line (S320);
Construction method of the prefabricated mat foundation system, characterized in that it comprises.
3. The method of claim 2,
A modular bar chair line located on the outer side of the plurality of modular bar chair lines is a prefabricated mat base, characterized in that by installing a modular bar chair 300 coupled with a form 350 to the outside, construction for each zone is possible. How to build the system.
According to claim 1,
Before the lower reinforcing bar 100 reinforcement step (S100),
An excavation step (S000) of excavating the stratum corresponding to the entire base area by an open cut method so that the excavation section maintains a stable slope;
Construction method of the prefabricated mat foundation system, characterized in that it further comprises.
According to claim 1,
The step of disposing the base reinforcement 200 (S200),
providing a support guide 230 to correspond to the position of the pillar (S210); and
By using a crane (C) on the upper portion of the reinforced lower reinforcing bar 100, the shear reinforcement body 210 to which the vertical reinforcing bar assembly 220 is integrally coupled is provided on the upper portion of the support guide 230 and placed in place. Step (S220) of spaced apart from the floor at the same time as the arrangement (S220);
Construction method of the prefabricated mat foundation system, characterized in that it comprises.
6. The method of claim 5,
The construction method of the prefabricated mat foundation system, characterized in that the mechanical anchorage 224 is coupled to the lower end of the vertical reinforcement 221 for joints of the vertical reinforcement assembly 220.
According to claim 1,
The modular bar chair 300 installation step (S300),
Step (S320) of adjusting the horizontal position and vertical height of the anti-interference device 360 provided in the lower part of the modular bar chair 300 (S320); and
Placing the modular bar chair 300 so as not to interfere with the lower reinforcing bar 100 (S330);
Construction method of the prefabricated mat foundation system, characterized in that it comprises.
8. The method of claim 7,
Before the horizontal position and vertical height adjustment step (S320),
Temporarily disposing the modular bar chair 300 on the upper part of the lower reinforcing bar 100 (S310);
Construction method of the prefabricated mat foundation system, characterized in that it further comprises.
8. The method of claim 7,
Step (S320) of adjusting the horizontal position and vertical height of the interference prevention device 360,
moving the height adjustment bar screwed to the nut body of the interference prevention device 360 in the vertical direction (S321); and
Step (S322) of moving the nut body 361 guided by the movement guide piece 363 of the interference prevention device 360 in the horizontal direction (S322);
Construction method of the prefabricated mat foundation system, characterized in that it comprises.

Images