KR100864953B1 - Frp-concrete composite structure using precast fiber reinforced polymer pipe of double(inner and outer) hollow type and the construction method using the same - Google Patents

Abstract

A concrete composite structure of a double cross section using a precast inner composite block segment, and a construction method of the concrete composite structure are provided to secure the connection efficiency sufficiently by connecting pipe-shaped fiber reinforced plastics mutually, to minimize the work in a construction site, to utilize a precast product manufactured in a factory to the maximum, and to have excellent economical efficiency, constructability and durability by making conveyance and installation possible. A concrete composite structure of a double cross section comprises a support structure, an inner composite block(200), and an outer block. The support structure is provided with many reinforcing bars and supported by installing the inner composite block and the outer block in a double cross-sectional structure, wherein a connection member including a reinforcing bar and a reinforcing bar assembly to connect with the inner composite block structurally. The inner composite block is manufactured at the appointed height by connecting precast inner composite block segments(200a,200b,200c) having a hollow(S) vertically in order, and placing plain concrete(221a,221b,221c,221d) in the inside of the precast inner composite block segments, wherein a ductility securing member(230) including a reinforcing bar or a reinforcing bar assembly is installed over the entire length of the inner composite block on the inside of precast concrete(220a,220b,220c,220d) of the inner composite block to secure ductility. The outer block is installed to cover the inner composite block and made of fiber reinforced plastics to secure the structural safety of a connection.

Description

FRP-CONCRETE COMPOSITE STRUCTURE USING PRECAST FIBER REINFORCED POLYMER PIPE OF DOUBLE (INNER AND OUTER) HOLLOW TYPE AND THE CONSTRUCTION METHOD USING THE SAME}

Figure 1 shows an example of a concrete composite structure using a conventional fiber-reinforced plastic.

Figure 2a shows a state in which the connection member is installed in the support structure of the present invention,

Figure 2b shows a precast inner composite block segment constituting the inner composite block of the present invention,

Figure 2c shows a socket type connection of the precast inner composite block segment,

3 illustrates an outer block of the present invention,

4A, 4B, 4C, 4D, and 4E sequentially illustrate a method for constructing a concrete composite structure having a double section structure using precast internal synthetic block segments of the present invention.

<Description of the symbols for the main parts of the drawings>

100: support structure 110: connecting member (rebar)

120: support groove

200: internal synthetic block

200a, 200b, 200c, 200d: precast internal composite block segment

210a, 210b, 210c, 210d: inner fiber reinforced plastic segment

220a, 220b, 220c, 220d: precast concrete

221a, 221b, 221c, 221d: free concrete

230: flexible member (rebar) 240: tension member

300: external block 400: adhesive

500: additional structure (coping part of column structure)

The present invention relates to a double-sided concrete composite structure using a precast internal synthetic block segment and a construction method thereof. More specifically, the concrete is constructed in a double-section structure by placing plain concrete inside the precast internal synthetic block segment in the form of a hollow and constructing it on the site by a certain height. It relates to a method for constructing a composite structure.

According to the prior art for the structural member of the concrete composite using a fiber-reinforced plastic (or fiber-reinforced polymer) in connection with the present invention, according to Japanese Patent Application Laid-Open No. 2003-253761

As shown in FIG. 1, the fiber reinforced plastics such as FRP, GFRP, and CFRP are manufactured in the form of a tube 10, and installed as a column structure on the upper surface of the base plate 40, and the concrete 20 inside the fiber-reinforced plastic of the tubular shape. The fiber-reinforced plastic concrete composite structural member is filled, the reinforcing bar 30 is disposed therein, and the coping part 50 is formed on the fiber-reinforced plastic.

However, since the tubular fiber-reinforced plastic 10 is manufactured to have a considerably large height or length, it is easy to separate the material and make compactness due to the problem of placing all at once when placing concrete 20 that is placed inside. There was a problem that not.

In addition, even if the fiber reinforced plastic pipe is manufactured and installed in a precast method of pre-filling the concrete 20 inside the fiber-reinforced plastic 10 in the form of a tube in a length that can secure economical efficiency. There was a problem that the transport and installation is practically very difficult.

In addition, even though a method of connecting and connecting a plurality of tubular fiber-reinforced plastics through a known connection configuration is used, a more reliable connection treatment configuration is provided in case of a defect in the connection part of each tubular fiber-reinforced plastic. There is a need for developing related technologies.

As to solve the problems of the prior art of the present invention,

SUMMARY OF THE INVENTION An object of the present invention is to provide a concrete composite structure and a construction method capable of sufficiently securing the connection part performance in construction while connecting tubular fiber-reinforced plastics to each other.

Another object of the present invention is to minimize the work in the field, to make the best use of the factory-made precast products, to enable the realistic transport and installation, economical and excellent construction, durable concrete composite structure and its construction To provide a way.

The present invention to achieve the above technical problem

First, by using fiber-reinforced plastic pipes, but adopting a method of manufacturing and installing them in the form of segments, it secures concrete casting quality and eliminates the need for formwork.

Second, the concrete composite was fabricated with a partial precast double section structure. In other words, the hollow portion S is formed on the inside by the precast concrete 220a, 220b, 220c, 220d formed to have a predetermined thickness from the inner surface of the inner fiber-reinforced plastic segments 210a, 210b, 210c, and 210d in the form of a tube. The hollow part formed precast inner synthetic block segments (200a, 200b, 200c, 200d) formed in the factory to a predetermined length, and laminated the inner synthetic block segments transported to the site by one stage and the hollow part (S ) To install the inner composite block 200 in particular by filling the plain concrete (221a, 221b, 221c, 221d),

Finally, the outer block 300, which is made of a fiber-reinforced plastic in the form of a tube, is integrally formed without connecting parts, and is installed to surround the inner synthetic block 200. Then, an epoxy resin is formed between the inner synthetic block and the outer block. The adhesive 400 included was filled to integrate both.

Third, the ductile securing member (rebar, etc. 230) and the tension member (PC strand, 240) in the precast concrete (220a, 220b, 220c, 220d) of the inner composite block 200, the present invention is structural In order to provide a more efficient concrete composite structure and its construction method.

BEST MODE Hereinafter, the best embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to describe the present invention more clearly and easily.

Figure 2a is a front view showing a state in which the connection member 110 is installed on the support structure 100 of the present invention,

Figure 2b is a precast concrete (220a, 220b, 220c, 220d) is formed in the hollow fiber-shaped inner fiber-reinforced plastic segments (210a, 210b, 210c, 210d) constituting the inner composite block 200 of the present invention, The precast internal synthetic block segments 200a, 200b, 200c, and 200d having the through hole 241 in which the ductile securing member 230 and the tension member 240 are installed in the precast concrete are illustrated in a perspective view.

Figure 2c is an enlarged view of the socket-type connection of the precast inner composite block segments (210a, 210b),

3 is a perspective view of the outer synthetic block 300 of the present invention,

Figures 4a to 4e in order to show the work in which the inner composite block 200 of the present invention is inserted into the outer composite block 300 is installed on the support structure 100 in order.

< Precast  Internal Synthetic Block Segment  Used Double-sided structure  Concrete Composite Structure>

The double-sided concrete composite structure is largely comprised of a support structure 100 , the inner composite block 200 and the outer block 300 .

The support structure 100 may be manufactured as a concrete structure of various forms as shown in Figure 2a , in the present invention will be described based on the concrete base plate manufactured to support the lifting structure from the bottom as a support structure.

The concrete base plate has a predetermined height, the concrete is produced in the field using a formwork in the form of a cuboid. A plurality of reinforcing bars are not embedded therein, and the inner synthetic block 200 and the outer block 300 of the present invention described below are installed and supported in a double cross-sectional structure.

The upper portion of the concrete base plate is to be further provided with a connecting member 110 including a reinforcing bar and reinforcing bar assembly for structural connection with the internal composite block 200 to be described later.

The connecting member 110 serves to mechanically connect the support structure 100 and the inner composite block 200 to each other, and installed in such a way that reinforcing the reinforcement from the upper surface of the concrete base plate in advance when the concrete base plate construction It is also possible to install a separate reinforcing bar assembly to protrude to the upper surface of the support structure.

Furthermore, the support groove 120 may be formed in a cross-sectional shape (circular cross-section or rectangular cross-section) of the outer block 300 so that the lower end of the outer block 300, which will be described later, in particular, may be fixed.

The support groove 120 may be fixed to the end of the outer block 300 is inserted into the support groove 120 by an adhesive including an epoxy resin, the depth of the support groove is such as the outer block 300 This may be determined in consideration of the insertion depth of the edge, and the like.

Installing the inner synthesis block 200, as will be described later in advance to base plate upper surface of the inner synthesis block projecting from the holding groove inner side as shown in Figure 2a The support 130 may be installed. This is to facilitate the initial installation of the inner composite block through the inner composite block support.

That is, the support groove 131 may be first installed with the same material as the inner fiber-reinforced plastic segment in the support groove 120, and the mortar or concrete 132 may be prefilled therein.

As installed inside the synthesis block 200 includes a hollow precast inner synthesis block segment (S) is formed (200a, 200b, 200c, 200d ) as shown in Figure 2b is connected in turn to the first three steps up and down, with the first three steps plain therein Concretes 221a, 221b, 221c, and 221d are filled and cured to produce a final predetermined height H.

Conventionally, after installing the fiber-reinforced plastic pipe having a final height as shown in Figure 1, but was produced by pouring concrete from the inside of the hollow tube, this method is to separate the concrete material at the time of pouring only 1.5M or more There was a problem that quality control is not easy due to the phenomenon.

Accordingly, in the present invention, as shown in Figure 2b , the precast concrete 220a, which has a predetermined thickness from the inner surface of the inner fiber-reinforced plastic segment 210a, 210b, 210c, 210d in the form of a hollow tube having a height that is easy to transport, install and install , First, precast internal synthetic block segments 200a, 200b, 200c, and 200d having hollow parts S formed therein by 220b, 220c, and 220d are manufactured at the factory.

In addition to the stacking step by step in the support structure 100, the internal composite block 200 is installed in a manner of pouring the stepless concrete (221a, 221b, 221c, 221d) by one step in the hollow portion (S).

At this time, each of the plain concrete (221a, 221b, 221c, 221d) is a precast internal composite block (200a, 200b, 200c, 200d) formed in the hollow portion (S) collectively referred to as the internal composite block 200 in the present invention.

Each height of the inner fiber-reinforced plastic segments 210a, 210b, 210c, and 210d may be, for example, about 1.5M (not necessarily the same height, but can be changed in various heights), and the diameter is at least. It is desirable for one worker to be able to compact concrete within each segment.

The reason is that when the height of each segment is within 1.5M, it is possible to prevent material separation even if the concrete is poured from the top of the segment, and that the worker can enter the inside of the segment and compact it. This is because quality control is possible.

Furthermore, the reason for forming the precast concrete (220a, 220b, 220c, 220d) but not completely filled inside the internal fiber reinforced plastic segments (210a, 210b, 210c, 210d) is the internal composite block 200 in a completely precast manner In the case of manufacturing and installing, there is an advantage that the workability, etc. is improved, but because of the weight of the concrete is almost impossible to transport enough to secure economic feasibility.

Accordingly, the present invention can be seen that the technical features of the inner pre-synthesis block 200 by the partial precast method to ensure the convenience of manufacturing, transportation and construction to the maximum.

Further, in order to simplify the work in the field as much as possible to simplify the precast concrete (220a, 220b, 220c, 220d) inside the flexible securing member 230 and the through-hole 241 for installing the tension member 240 to be described later further formed It could be.

That is, as shown in Figure 2b, inside the precast concrete (220a, 220b, 220c, 220d) of the inner composite block 200, the flexible member 230 including a reinforcing bar or reinforcing bar assembly over the entire length of the inner composite block To be installed more.

In the case of the internal composite block 200, there is an advantage that the reinforcing bar (a kind of concrete reinforcing material) used for reinforcement concrete is not required due to the material characteristics of the fiber reinforced plastic (FRP, etc.) and the concrete restraint effect, but the present invention In the installation of the ductile securing member 230 including the reinforcing bar or reinforcing bar assembly in order to secure the ductility, not the function of such concrete reinforcement.

This is to solve the problem that the internal synthetic block 200 may show brittle fracture behavior with respect to the working load, and to ensure ductility during the delayed time until the reinforcement or the reinforcing assembly breaks while yielding to the working load. The principle is that it can. Thus, the flexible securing member 230 of the present invention can be distinguished by its installation purpose, installation amount and installation method as compared to the conventional reinforcement to be reinforced to the reinforced concrete even when using the same rebar.

In addition, a through hole 241 is formed inside the precast concrete 220a, 220b, 220c, and 220d so that the tension member 240 can be installed, and the tension member 240 is later added to the through hole 241 as shown in FIG. 4E. It will be installed so that it can be settled later.

The pre-stressed internal composite block segments 200a, 200b, 200c, and 200d stacked one by one by prestress by the tension member 240 are bound to each other, and the prestress is introduced in the axial direction, thereby providing more effective load resistance. It can be said to give.

At this time, each of the inner fiber-reinforced plastic segment (210a, 210b) is a body portion (211a, 211b) using a fiber-reinforced plastic in the form of a hollow tube of circular cross section (or square cross section) as shown in Figure 2c ; Connecting ends (212a, 212b) protruding while a step is formed inward on an outer circumferential surface of the body portion; And a connection end accommodating part 213a and 213b formed on the opposite side of the connection end and formed with a step on the inner side of the hollow so as to be caught while the other connection end is inserted.

The body parts 211a and 211b are manufactured in the form of hollow tubes as cross-sections, such as circular, using fiber-reinforced plastics, ie GFRP, CFRP, etc., and are manufactured by strict quality control in the factory, and precast concrete 220a, 220b) is poured and cured.

These body parts 211a and 211b not only serve as a form of formwork, but are integral with the concrete so that the body parts 211a and 211b and the precast concrete 220a and 220b are combined with each other to serve as concrete composites. Basically, it is possible to secure sufficient cross-sectional force against external load even if there is no concrete reinforcement such as reinforcing steel or steel, or even small amount of steel.

Furthermore, the precast concrete 220a and 220b and the plain concrete 221a and 221b formed inside the body parts 211a and 211b are restrained. Due to the restraining effect of the body parts 211a and 211b, the inner synthetic block 200 can withstand larger loads, thereby increasing resistance to working loads.

The connection ends 212a and 212b are formed for connection with other internal fiber reinforced plastic segments 210b, and segments are formed to connect the internal fiber reinforced plastic segments 210a and 210b to each other by a kind of socket connection method. It is formed to protrude in the direction.

That is, the step is formed to protrude while forming a step inward on the outer peripheral surface of the end of the body portion 211, wherein the size of the connection end portion 212 can also be inserted into the connection end receiving portion 213 of the other internal fiber reinforced plastic segment It is formed to a degree, and its length can be changed according to the size and installation height of the internal fiber reinforced plastic segment.

The connection end accommodating parts 213a and 213b are formed on the opposite side of the connection end 212, and are stepped outward from the hollow inner surface to a predetermined depth so that other connection ends may be caught. That is, when the connecting end is inserted into the internal fiber reinforced plastic segment and connected to the point where the step is formed, it is caught at the step where the step is formed so that it is no longer inserted, whereby the internal fiber reinforced plastic segments are mechanically coupled to each other. In the present invention, the connection end 212 and the connection end receiving portion 213 is called a socket-type connection .

Further, it is also possible to connect the internal fiber-reinforced plastic segments to each other by a method other than such a socket type connection part, and the socket type connection part of the present invention is shown as an example and may be installed without any additional connection part. This is because the outer block 300 is installed while surrounding the inner composite block 200 as described below can sufficiently secure the connection portion performance.

The lower end of the flexible securing member 230 is preferably connected to the upper end and the lower part of the connecting member 110 reinforced from the base plate 100, as shown in Fig. 4e to each other by overlapping each other, rebar, such as a coupler Joints can also be used.

The precast internal composite block segments 200a, 200b, 200c, and 200d connected to each other as the socket type connection are necessarily formed with a connection, and such a connection may be a factor that may affect structural safety in any way.

Therefore, in the present invention, in order not to impair the structural safety by such a connection portion, the entire inner synthetic block 200 is also wrapped with an outer block 300 of fiber reinforced plastic material, and the adhesive 400 including epoxy resin therebetween. After charging, the external block 300 is integrated with the connection part of the internal synthesis block 200, thereby structurally canceling the instability of the connection part.

The outer block 300 is manufactured in the shape of a hollow tube using a fiber reinforced plastic, ie GFRP, CFRP, etc. as a cross-section, such as a circular cross section, as shown in Figure 3 is not installed in such a way that a plurality of segments are connected, in the factory without a connection There is a technical feature of being made of fiber-reinforced plastic in the form of a hollow tube integrally produced as a height corresponding to the height of the inner synthetic block 200.

If the size is based on a circular cross section, the inner synthetic block is made to the minimum diameter that can be fitted to minimize the amount of adhesive filling.

As a result, the outer block 300 is installed to surround the inner synthetic block 200. For example, the inner composite block 200 is interpolated into the hollow interior of the outer block 300, that is, the outer block 300 is lifted by a lifting device such as a crane, and then the outer block 300 from the upper portion of the inner composite block 200. ) Can be fitted.

The main function of the outer block 300 is to ensure the structural safety of the connecting portion, such as the socket-type connection of the inner composite block 200, and is not simply a member synthesized with concrete, so it is simply referred to as a block of fiber reinforced plastic material. .

At this time, the lower end of the outer block 300 may be inserted into the support groove 120 formed on the upper surface of the concrete base plate 100, as shown in Figure 4e so that its position does not change after installation. Accordingly, the position of the support groove may be somewhat wider in consideration of the installation position of the external block, and the construction of the external block may be improved by applying an adhesive including an epoxy resin in advance in the support groove.

As a result, the outer block 300 and the inner composite block 200 are installed in a double cross-sectional structure. Since only the cross-sectional structure is such that the outer block is simply positioned around the inner synthetic block, there is a problem in that the external block cannot be integrally resisted against the working load. The inner surface of the fiber reinforced plastic outer block is filled with an adhesive 400 including an epoxy resin as shown in FIG. 4e to integrate the inner synthetic block and the outer block.

By securing the integrity, the connection part of the inner synthetic block is integrated with the outer block as described above, and thus has the effect of structurally canceling the instability of the connection part.

In the construction form of the present invention, in the case of the support structure 100 to be manufactured in the field, the precast inner composite block segment (200a, 200b, 200c, 200d) formed in the hollow portion constituting the inner composite block 200 is factory After manufacturing, but transported to the site, the plain concrete (221a, 221b, 221c, 221d) is to be placed in the field to work, and after the external block 300 is also manufactured in the factory, the method that follows the method of installing in the field However, the present invention is not limited thereto, and both the inner composite block and the outer block may be manufactured at the factory, and then only the installation may be performed in the field.

< Precast  Internal Synthetic Block Segment  Used Double-sided structure  Construction Method of Concrete Composite Structure>

First, as shown in FIG. 4a , the support structure 100 is installed through the excavation work of the ground on which the concrete composite structure is to be installed.

As described above, the supporting structure 100 has a connecting steel 110 protruding from the upper surface to secure the mechanical connection performance with the inner synthetic block 200, and the supporting groove 120 is also formed on the upper surface. The outer block 300 is inserted and installed to be formed.

In addition, in order to install the inner composite block 200, the inner composite block support 130 including the support 131 and concrete 132 protruding in the support groove in advance is installed on the upper surface of the base plate.

In addition, the bottom of the support structure 100 so that one end of the tension member 240 can be fixed to the conventional fasteners 140 installed in the block-out portion to be fixed so that one end of the tension member in advance to the fastener 140 Allow it to be fixed but allow the other end of the tension member to extend upwards.

Next, as shown in FIG. 4B , the first stage of the precast inner composite block segment 200a having the hollow part prefabricated in the factory and brought into the site is first installed on the inner composite block support 130 of the supporting structure 100. The tension member 240 penetrates the through hole formed in the precast concrete 220a of the precast internal synthetic block segment 200a to extend upward.

Next, as shown in FIG. 4c , the hollow concrete 221a is filled in the hollow portion of the precast inner synthetic block segment 200a.

Next, as shown in FIGS. 4C and 4D , the sockets are formed on the precast inner synthetic block segments 200b, 200c and 200d, respectively, in which hollow parts are sequentially formed on the precast inner composite block segments 200a. By filling the hollow-free concrete (221b, 221c, 221d) in sequence to the hollow portion to install the inner composite block 200 to the final height.

At this time, the tension member 240 is to pass through the through-holes of each of the precast inner composite block segments (200b, 200c, 200d), the final protrusion height is enough to penetrate the coping portion and the additional upper structure 500 to be described later do.

Next, as shown in FIG. 4D, the outer block 300 is inserted from the upper portion of the inner synthetic block 200 so that the lower end is inserted into the supporting groove 120 of the support structure.

Next, by filling the inner surface of the outer block 300 and the inner surface of the inner composite block 200 by filling the adhesive 400 such as epoxy resin, the outer block 300 and the inner block are integrated to form a concrete structure of the double-sided structure. Will install

Next, an additional upper structure 500 such as a coping part is further installed on the upper portion of the inner composite block 200 and the outer block 300 installed in a double cross-sectional structure as shown in FIG. 4E .

The upper end of the coping portion is to make the tension sphere 510 is formed so that the other end of the tension member 240 protruding upwards can be fixed after the tension.

The internal composite block and the additional superstructure is bound to each other by the prestress by the tension member 240, so that the bending rigidity for the axial force and the like can be enhanced.

The concrete composite structure using the fiber reinforced plastic pipe made of the double precast structure of the partial precast method of the present invention and the construction method can be used to construct a structure with better connection performance and easier quality control.

By using the fiber-reinforced plastic and the combination of the restraint effect and the tension material of the concrete filled therein, more efficient cross-sectional design is possible, and it is particularly efficient in manufacturing and transporting because it is assembled and installed by the partial precast method. This becomes possible.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. Those skilled in the art of the present invention can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (10)

Repeating the operation of filling the hollow in the concrete while connecting the precast inner composite block segment having a hollow portion formed on the support structure one by one, the inner composite block 110 is a plurality of precast inner composite block segments are connected to each other installed And a fiber-reinforced plastic block manufactured integrally without a connecting portion in the form of a hollow tube, the inner synthetic block having an integrated diameter and having an integrated diameter, including an outer block 120 inserted from an upper portion of the inner synthetic block and installed around the inner synthetic block. Install the composite structure, The hollow formed precast inner synthetic block segment, the hollow portion is formed by the precast concrete formed to a certain thickness from the inner surface of the inner fiber-reinforced plastic segment of the hollow tube form, the hollow portion is filled with concrete, The precast inner composite block segment is a concrete composite structure having a double-section structure using a precast inner composite block segment, characterized in that a flexible securing member including a reinforcing bar or reinforcing bar assembly is installed over the entire length of the inner composite block segment. delete The precast interior of claim 1, wherein a tension member including a PC strand is further installed in the precast inner composite block segment in which the flexible securing member is installed, and is tensioned and settled over the entire length of the inner composite block. Concrete structure of double section using composite block segment. delete delete delete delete delete In constructing a concrete composite structure filled with concrete in a support structure, a precast internal synthetic block segment in which the hollow part is formed by precast concrete formed at a predetermined thickness from the inner surface of the hollow fiber-shaped internal fiber-reinforced plastic segment is formed in the support structure. Repeating the step of filling the hollow portion of the hollow concrete while connecting by one stage, the step of installing an inner composite block formed therein a flexible member including a reinforcing bar or reinforcing bar assembly over the entire length; Installing a hollow block in the form of a fiber reinforced plastic block integrally manufactured without a connecting portion, the outer block having a diameter in which the inner synthetic block is interpolated around the inner synthetic block; And Integrating each other with a filler comprising an adhesive comprising an epoxy resin between the inner synthetic block and the outer block; Concrete construction structure construction method of a double-sided structure using a precast inner composite block segment comprising a. 10. The method of claim 9, further comprising installing a tension member including a PC strand that is tensioned and settled over the entire length of the inner composite block.

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