KR101072258B1 - Column connectiom parts construction method - Google Patents

Abstract

Construct column structure with high-strength concrete, and form the joint part (A) between the column structure and the slab / beam together with slab / beam concrete with normal strength together with the reinforcing means for economical and efficient column structure connection. A construction method is disclosed.

In the method of constructing the connection structure of the column structure, the concrete having the strength required for the slab / beam is to be cast without the mixing of the concrete having different strength in the connection structure between the column structure and the slab / beam. It is to be secured by a connecting portion reinforcing means including a rod-shaped precast concrete member or a constrained pipe member made of high strength concrete that is greater than the strength of the high strength concrete for the structure.

Column structure, high strength concrete

Description

COLUMN CONNECTIOM PARTS CONSTRUCTION METHOD}

The present invention relates to a method for constructing a column structure connection portion. More specifically, the present invention relates to a method of constructing a column structure connecting portion to allow the high-strength concrete required to be applied to the upper and lower pillar structures while placing the slab / beam concrete on the connection portion between the column structure and the slab / beam.

High-strength concrete has been widely used in recent years, the construction of the structure.

In general, concrete having a strength of 40-50 MPa or more is referred to as high-strength concrete, and since such high-strength concrete can relatively reduce the cross-sectional size that a conventional concrete structure should have, it is being used in all or part of a member for a concrete structure.

In particular, in the case of the construction of slab / beam and column structure, the lower column structure is usually constructed, and the slab / beam is connected to the lower column structure and the slab / beam is connected again. The construction of the upper pillar structure in the way will increase the number of floors of the building.

In the case of a column structure that is mainly subjected to axial force, by using high-strength concrete, many examples are designed to slim the cross-sectional size of the column structure, in particular, high-strength concrete for the column structure is frequently used in building design.

In this case, the use of such high-strength concrete has the advantage of producing a slim structural member by reducing the cross-sectional size of the structure. Construction work such as pouring concrete water is required.

In other words, when the concrete is strengthened, the unit cement amount is increased and the water-cement ratio is significantly lowered. Therefore, pump viscous is difficult due to the high viscosity of cement, and the low filling and gap permeability are small. In addition, the temperature of concrete increases due to the heat of hydration of cement, causing cracking due to temperature stress.

In order to solve this problem, domestically, to solve these problems, industrial powders, such as blast furnace slag and fly ash, are used as mineral admixtures to increase the amount of powder in concrete or to use chemical admixtures such as high-performance sensitizers and thickeners. Research is ongoing.

On the other hand it has been studied using a cement mineral composition to adjust the bell light (Belite) cement of the same token in progress also actively there Bell Light cement is usually due to the bell light (C ₂ S) components chemical admixtures as a number of cement than the Portland cement The good dispersion effect improves the fluidity, reduces the temperature rise of concrete due to the initial heat of hydration, and has been reported to have many advantages such as strength increase in the long-term age.

In general, high strength concrete is characterized by the fact that the fluidity is usually large because the high flow admixture is used to reinforce the disadvantage that the water-cement ratio is significantly lowered.

On the other hand, slabs, slabs and beams that are constructed between column structures designed as flexural members do not need to use high-strength concrete, so concrete (21-30 MPa) with general strength is constructed using formwork.

In this regard, even when the column structure is constructed of high-strength concrete, low-strength concrete can be used in the case of slab / beam, except that the slab / beam concrete strength is 1.4 times higher than that of the column structure concrete. In the case of raw materials, the construction is prescribed according to the detailed construction of the city, and in order to solve this inconvenience, the slab / beam concrete strength is applied to 1.4 times less than that of the column structure concrete.

That is, when designing the building, when the column structure is designed with high-strength concrete, the concrete strength standard is determined so that the slab / beam concrete strength is 1.4 times or less of the column structure concrete strength. In other words, the concrete for the column structure and the slab / beam fabrication is made to use different strengths.

However, the use of mixed concrete of different strength in the construction of the column structure and the slab / beam in the construction is inefficient because the construction is very inferior in terms of site conditions. Therefore, the necessity of an improved construction method by the realistic method is required. This was required.

In addition, when attempting to construct a column structure with 50 MPa strength, for example, the slab / beam must use concrete with a strength of at least 35.7 MPa (50 / 1.4 = 35.7 MPa), which is 20-30 for the slab / beam. Even though concrete having MPa does not have any structural problem, expensive concrete with a strength of 35.7 MPa or more must be used to satisfy the related regulations, which makes it economically unreasonable.

Accordingly, the present invention is economical pillar structure and slab while satisfying the requirements of the relevant regulations in the connection of the slab / beam made of high strength concrete and concrete having a relatively lower strength than high strength concrete Providing a method of constructing the connection part of the beam is a problem to be solved.

In order to achieve the above object, the present invention is configured as follows.

First, in the connection between the column structure and the slab / beam, the concrete having the strength required for the slab / beam is cast without mixing the concrete with different strengths, but the strength of the high-strength concrete for the column structure to use the required connection strength It can be secured by connecting part reinforcing means including rod-shaped precast concrete member or constrained pipe member made of higher strength concrete.

Second, when the constrained pipe member can be used to more effectively transfer the load transmitted to the column structure as the connecting portion reinforcing means, in particular, the installation form (parallel installation) of the constrained pipe member is optimized to more efficiently connect the column structure. Construction method can be provided.

According to the present invention, even in the connection portion between the column structure and the slab / beam, it is possible to construct an economical building without degrading the workability and workability.

An embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Accordingly, such improvements and modifications are within the scope of the present invention as long as they are obvious to those skilled in the art.

BRIEF DESCRIPTION OF THE DRAWINGS In order to describe the present invention more clearly and easily, the following describes the best embodiments of the present invention in detail with reference to the accompanying drawings. Is not limited to the embodiments described below.

Basically, although several types of constructions are required for the construction of the building, the present invention is to install the columnar structure, and look at the construction of the slab alone or the slab and the beam (beam) together in the columnar structure, such a columnar structure, slab, It is noted that the beams (beams) are premised on work by cast-in-place concrete.

This is because when constructing a pillar structure, slab, beam (beam) with a PC member, it is rarely necessary to cast different concrete directly on site as in the present invention, because the problems of the prior art described above are not particularly highlighted.

First, the lower pillar structure 110 is constructed as shown in FIG. 1A.

Such construction is carried out by using the formwork for pillar structure (usually steel formwork), and looks at the columnar structure of the rectangular cross-sectional shape.

That is, after the high-strength column concrete is poured into the form using a formwork not shown so that a columnar structure having a constant rectangular cross-section is formed, curing is performed to dismantle the form to complete the lower column structure 110. .

At this time, the upper surface of the completed lower columnar structure 110 is located at a position lower than the slab 310 or the slab 310 and the formation position of the beam 320 to be described later (so that the portion B of Figure 1c) The height of formation is determined so as to correspond. That is, the slab and the beam completes the lower pillar structure 110 only to the lower portion of the connection portion (A) of the pillar structure. This may be called to install the connecting portion reinforcement means 200 which will be described later.

The high-strength column concrete used at this time can use concrete having a strength of 40-50MPa or more unless otherwise specified.

Next, as shown in Figure 1b is to install the connecting portion reinforcement means 200 according to the present invention. The connection part reinforcement means may use a rod-shaped precast concrete member 210 made of high strength concrete that is greater than the strength of the high-strength concrete for the column structure to be used, or the constrained pipe members 220 and 230 having a circular or square tube shape.

First, referring to the example using the rod-shaped precast concrete member 210, first, the rod-shaped precast having a cross-sectional size smaller than the upper surface on the upper surface of the completed lower columnar structure 110 Fixing the lower end of the concrete member 210 with anchor bolts (111, 112),

The internal reinforcement of the lower columnar structure 110 around the rod-shaped precast concrete member 210 extends upward as shown in FIG. 1D to pass through the connection portion A, which will be described later, of the upper columnar structure 120. It will be connected to the internal rebar.

At this time, the forming height of the rod-shaped precast concrete member 210 is to be formed higher than the height of the upper surface of the slab 310 to be constructed later, so that the upper end is embedded to the inside of the lower end of the upper column structure 120 to be described later To be extended.

The rod-shaped precast concrete member 210 is to reinforce the strength of the connection portion (A) to be formed of high-strength concrete by forming the concrete strength of the connection portion (A) according to the slab / beam concrete. (If this is not the case, the connection is high-strength concrete, and the slab / beams must be mixed and poured with lower strength concrete).

In addition, the rod-shaped precast concrete member 210, for example, if the strength of the lower or upper columnar concrete is in the range of 40-50MPa is to use a high-strength concrete at least greater than this strength.

Furthermore, the rod-shaped precast concrete member 210 is made of RC (reinforced concrete) or PC (pre-stressed concrete) member to further increase the required strength by the reinforcement, tension material, etc., which can burden compression and tension. It can also be secured.

Therefore, the rod-shaped precast concrete member 210 is not one rod-shaped precast concrete member 210 in order to reinforce the strength of the connection portion (A), but if there is no limitation of the cross-sectional area, Figures 2 and 3 As such, to arrange a plurality of rod-shaped precast concrete members 210 of the same height in parallel to the dispersion effect of the axial force transmission in the axial force connection.

This may be more effective when the cross section of the upper surface of the upper pillar structure 120 is considerably large in the case where it is difficult to secure the required strength of the connecting portion with only one rod-shaped precast concrete member 210.

The lower part of the rod-shaped precast concrete member 210 is sufficient between the lower column structure and the bottom of the slab / beam to ensure sufficient coupling performance by the stud or concrete unevenness 211, so that the load is sufficiently transferred. Although not shown, it is possible to replace the horizontal reinforcing bar that can serve as a stud for the convenience penetrating the lower end of the rod-shaped precast concrete member 210, but the position of the stud for convenience installation.

This stud allows the rod-shaped precast concrete member 210 to be more securely coupled to the lower column structure, so that the working load transmitted from the upper column structure is transferred to the lower column structure through the rod-shaped precast concrete member 210. It will play an important role in ensuring effective delivery.

Next, look at the example using the restraint tube members 220 and 230 as shown in Figures 2 and 3

First, fixing the lower end of the constrained pipe member 220 having a smaller cross-sectional size than the upper surface on the upper surface of the completed lower pillar structure 110 with a clamp and an anchor bolt, not shown,

In addition, the inner reinforcement of the lower columnar structure 110 around the constrained tube member 220 is to be extended upward so as to be connected to the inner reinforcement of the upper columnar structure 120 through the connecting portion (A) to be described later. .

At this time, the forming height of the constrained pipe member 220 is also formed to be higher than the height of the upper surface of the slab to be constructed later, the upper end is to extend to the inside of the lower end of the upper column structure 120 to be described later.

The constrained pipe member 220 is to be formed through-hole 213 to be filled with the slab / beams (300: 310,320) concrete is poured into it, whereby the slab / beam 300 filled therein 310, 320 is constrained by the constrained pipe member 220, it is possible to increase the concrete strength of the more reliable connection. That is to say that the constrained pipe member 220 wraps the concrete at the connection portion.

In addition, such a constrained pipe member 220 is not one constrained pipe member 220 to reinforce the strength of the connecting portion (A), if there is no limitation of the cross-sectional area, also parallel to a plurality of constrained pipe members 220 of the same height It is possible to expect the dispersion effect of the axial force transmission in the axially connected connection.

That is, in the case where the cross-sectional area of the upper surface of the upper pillar structure 120 is considerably large, it may be more effective in the case where it is difficult to secure the required strength of the connecting portion with only one constrained pipe member 220, and at this time, the plate A plurality of constrained pipe members 220 are pre-fabricated on the upper surface of the upper pillar structure 120 by bolts 112 and 113 and welded to the upper surface of the member 212. The constrained tube member 220 to be installed integrally at a time.

In addition, the lower part of the constrained pipe member 220 is the same between the lower pillar structure and the bottom of the slab / beam to ensure sufficient coupling performance by the stud 211 or horizontal rebar.

At this time, the restraint pipe member 220 may be made of a PC or RC concrete pipe shape, or may be made of steel material.

In addition, as the constrained tube member, it is preferable to use the member 230 having a circular tube shape as shown in FIG.

Also, as described above, since the constrained pipe members 220 and 230 are used to secure the strength of the connec- tion parts, the constrained pipe members 220 and 230 may be manufactured in the form of PC or RC concrete pipe, or made of steel. It doesn't matter what you use.

Accordingly, in the case of the rod-shaped precast concrete member 210 and the constrained pipe members 220 and 230, the outer circumferential surface of the rod-shaped precast concrete member 210 and the constrained pipe members 220 and 230 may have a surface structure that is advantageous for shear coupling in a manner of scratching or uneven surface shape. Preferably, these constrained pipe members 220 and 230 are also made of high-strength concrete with greater strength than the lower columnar concrete.

In the case of the rod-shaped precast concrete member 210, the constrained pipe members (220, 230) is a steel material, the strength thereof is usually greater than that of the lower pillar structure concrete, so there will be no special strength limitation.

Next, as shown in FIG. 1C, the slab and the beam lower part B are first cast and cured using the formwork, and the slab and the beam concrete are not shown together with the connection part A. Use to finish by pouring.

At this time, the slab, beams 300: 310,320 concrete for concrete is integrally formed using a conventional concrete having a smaller strength than the concrete of the lower pillar structure (110).

In the connection portion (A), the slab, beam concrete is formed so that the connection portion reinforcing means (200: 210, 220, 230) by the rod-shaped precast concrete member 210, the restraint pipe member (220, 230) is embedded, the slab / beam In the case of the slab / beam according to the shape of the formwork is formed by the usual site casting.

In this case, in the case of a building in which no beam is formed, the slab may be formed alone, and in the case of forming the slab and the beam together, the beam may be formed first in order, and the slab may be formed later. In this case, the slab may be constructed by using a deck plate on the constructed beam.

When the slab, the concrete for the beam is finally completed, the connection portion reinforcing means 200 by steel members or the like protruding upward from the upper surface of the slab is exposed.

Therefore, the connection portion reinforcement means 200 is also constructed to the upper pillar structure 120 by using the formwork in the same way as the lower pillar structure 110 to be buried.

That is, the upper pillar structure 120 is completed by re-pouring the high-strength pillar concrete so that the upper portion of the connection part reinforcing means 200 exposed by using a mold not shown as shown in FIG. 1D is embedded.

At this time, the high-strength pillar concrete used for the upper pillar structure 120 and the lower pillar structure 110 is to use concrete of the same strength.

Thus, according to the present invention, the high-strength column concrete is used only for the lower and upper column structures, and in the case of the slab / beam that does not necessarily need to use the high-strength column concrete, it is formed using the concrete having the required strength, The additional strength required for the connecting portion (A) can be secured by the connecting portion reinforcing means 200, thereby enabling a more efficient and economical column structure and the construction of the slab / beam connecting portion.

For example, when using 50 MPa strength as a high-strength concrete of the upper and lower column structures, the slab / beam should be constructed of concrete having a strength of 35.7 MPa (50 / 1.4 = 35.7 MPa) or more according to the regulations, but in the case of the present invention The site reinforcement means can sufficiently resist the strength at the connecting part, so that concrete of about 21 MPa can be used, thereby significantly reducing the cost of using the concrete, which increases as the strength increases.

When using rod-shaped precast concrete member 210 or restraint pipe members 220 and 230 as reinforcing means, it is expected that the structural performance will be very advantageous in load transfer and resistance of column structures due to tension and concrete restraint effect as PC members. It can be seen that.

Therefore, the connecting portion (A) means a portion where the slab / beam is connected to the columnar structure, the connecting portion (A) is connected to the reinforcement means 200 is installed because it is on the extension line of the actual columnar structure, It can be seen that only this connection (A) concrete is to be cast into slab / beam concrete.

1a, 1b, 1c and 1d is a construction sequence diagram of the column structure connecting portion according to the present invention.

2 and 3 show other embodiments of the connector reinforcing means of the present invention.

<Description of Major Reference Signs>

110: lower pillar structure

120: upper column structure

200: reinforcing means

210: precast concrete member in the form of a rod (connection part reinforcing means)

220,230: Restriction pipe member (connection part reinforcement means)

310: beam

320: slab

Claims (5)

In the construction method of the column structure connection site by the cast-in-place concrete that is constructed so that the concrete strength of the slab, the column structure supporting the beam than the concrete constituting the slab, the beam, the slab and the beam is connected to the column structure (A) In order to install only up to the lower part, the high-strength pillar concrete is poured by using the formwork to complete the lower pillar structure 110, and a connection for reinforcing the concrete strength of the connecting portion on the upper surface of the lower pillar structure. In addition to installing the site reinforcement means 200, the slab, the concrete for the beam 300 is poured together using the formwork together with the reinforcement means of the connection and completed, and the high-strength column concrete on the upper surface of the connection site reinforcement means Including the step of completing the upper pillar structure 120, the connection portion slab, beam But to cast-in-place concrete and same intensity, and so that the reinforcement of concrete and insufficient strength of the connection portion with the connection part reinforcing means, The connecting portion reinforcing means is a rod-shaped precast concrete member which is installed to be embedded in the connection portion on the lower pillar concrete upper surface, so that the lower end of the rod-shaped precast concrete member is located at the bottom of the slab, beam bottom And the upper end of the rod-shaped precast concrete member is installed upwardly so as to extend upward from the upper surface of the slab. The method of claim 1, wherein the rod-shaped precast concrete member has a plurality of rod-shaped precast concrete members arranged in parallel so as to be integrally installed with the plate member (212). In the construction method of the column structure connection site by the cast-in-place concrete that is constructed so that the concrete strength of the slab, the column structure supporting the beam than the concrete constituting the slab, the beam, the slab and the beam is connected to the column structure (A) In order to install only up to the lower part, the high-strength pillar concrete is poured by using the formwork to complete the lower pillar structure 110, and a connection for reinforcing the concrete strength of the connecting portion on the upper surface of the lower pillar structure. In addition to installing the site reinforcement means 200, the slab, the concrete for the beam 300 is poured together using the formwork together with the reinforcement means of the connection and completed, and the high-strength column concrete on the upper surface of the connection site reinforcement means Including the step of completing the upper pillar structure 120, the connection portion slab, beam But to cast-in-place concrete and same intensity, and so that the reinforcement of concrete and insufficient strength of the connection portion with the connection part reinforcing means, The connecting portion reinforcement means A constrained pipe member that is installed to be embedded in the upper portion of the lower high-strength pillar portion, so that the lower end of the constrained pipe member is located at the bottom of the slab, the bottom of the beam, the upper end of the constrained pipe member from the upper surface of the slab It is installed to extend upward to be located in, the constrained pipe member is a slab, construction method for connecting the column structure so that the through-hole is further formed so that the beam concrete can communicate. 4. The column structure according to claim 3, wherein the constrained pipe member is a steel pipe member or a concrete pipe member in the form of a square tube or a circular tube, and the plurality of constrained tube members are arranged in parallel so as to be integrally installed with the plate member 212. Construction method of connection part. delete

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