KR20190018263A - Composite multi-cap for finishing fixtures and method for constructing prestressed concrete structures using the same - Google Patents

Abstract

The present invention relates to a composite multi-cap for finishing a fixture and a method for constructing a prestressed concrete structure using the same, and more specifically, to a composite multi-cap for finishing a fixture and a method for constructing a prestressed concrete structure using the same, which prevent corrosion of a fixing plate without separate finishing by bonding a plate part so as to bring the same in contact with the fixing plate, perform grouting in a cap part and protects an anchor head, a steel wire and a wedge received in the cap part by forming a grouting hole at one side of the cap part, simplify a construction process by omitting a process of wrapping an end portion of the steel wire with a bird′s nest or finishing with concrete, and greatly improve a grout filling rate by which the grout remaining in a grout injection pipe is additionally filled in a sheath pipe and the cap part.

Description

{Composite multi-cap for finishing fixtures and method for constructing prestressed concrete structures using the same}

The present invention relates to a composite multi-cap for finishing a fixing port and a method of constructing a prestressed concrete structure using the multi-cap. More particularly, the present invention relates to a method for constructing a multi- Grouting is performed in the cap part by forming a grouting hole in the cap part so that the anchor head, the steel wire and the wedge accommodated in the cap part can be sealed and protected and the construction process can be simplified by omitting the step of wrapping the end of the steel wire with a bird's nest or finishing with concrete The present invention relates to a composite multi-cap for finishing a fixture and a method for constructing a prestressed concrete structure using the same, wherein grout remaining in the grout injection pipe is additionally filled in the sheath pipe and the cap portion.

The girder is placed under the bottom plate which directly receives the load of the vehicle from the upper structure of the bridge, and supports the upper load and transmits the load to the lower structure of the bridge or bridge.

Such a girder has a large compressive force, but has a small tensile force, and therefore has a problem in that when the concrete is weak in bending stress, it does not play a role and cracks occur.

In order to solve this problem, PSC (PreStressed Concrete) girder is used to introduce compressive stress to offset the tensile stress generated in concrete.

The PSC girder calculates the magnitude and distribution of the stress acting on the member by a given load and pre-tensiones the internal PS tendon to offset the stress acting on the member.

On the other hand, PSC (PreStressed Concrete) is one of the methods of applying a prestress to concrete. PC concrete wire is placed in the sheath pipe to pour concrete, and after the concrete is hardened, the PC steel wire is tightened and fixed on the cutting end This is a method of introducing tensile stress.

As a prior art related to the fixing port, Korean Patent No. 10-0734169 discloses a girder (G) comprising upper and lower flanges and abdomen as shown in Figs. 5A to 5C; A fixing block B protruding at both sides of the girder with a predetermined width and width; And a maintenance fixing port (F) for tensioning the common strand (30) after a main tension at a predetermined position on both ends of the fixing block, wherein the fixing fixation port (F) for maintenance is a constant A sheath tube 10 having a diameter and a length; A spiral reinforcing bar (20) turning along an outer peripheral surface of the sheath tube (10); A strand (30) embedded in the sheath tube (10) and formed by twisting a plurality of PC steel wires; A pressure plate (40) installed outside the end of the strand (30) and installed to penetrate the sheath pipe (10); A fixation port head 80 composed of a ring nut 60 for additional tension and a tension releasing bracket 90 to which a wedge 50 for fixing the strand 30 is mounted is installed on the platen 40, And a cap (70).

However, in the above-mentioned patent, there is a problem in that the concrete finishing is required to prevent corrosion because the pressure plate 40 is exposed to the outside, and the end of the steel wire or the strand 30 is accommodated in the head cap 70, However, it is not sealed, so there is a problem of corrosion even though the concrete finishes.

Korean Patent No. 10-0734169

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a fixing device for a fixing device which can prevent corrosion of a fixing plate without a separate finishing, The present invention also provides a method for constructing a composite multi-cap for finishing a fixture, which is capable of sealing and protecting an anchor head, a steel wire and a wedge accommodated in a cap portion, and a method of constructing a prestressed concrete structure using the same.

It is another object of the present invention to simplify the construction process by omitting the step of wrapping the end of the steel wire barrel or finishing with concrete and further allowing the grout remaining in the grout injection pipe to be further filled in the sheath pipe and the cap part, And a method for constructing a prestressed concrete structure using the composite multi-cap.

The problems to be solved by the present invention are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a composite multi-cap for finishing a fixing port according to the present invention, comprising: casting to be embedded in a concrete structure such that a fixing plate provided at one end is exposed to the outside; And a wedge inserted into the steel wire insertion hole to fix the steel wire, wherein the composite multi-cap comprises: a cap part for receiving the anchor head; A plate portion extending from the edge of the cap portion and abutting against the shape of the fixing plate; And a grouting hole provided at one side of the cap part.

Further, in the composite multi-cap for finishing the fixing port according to the present invention, the grouting hole is disposed on the grouting hole formed in the fixing plate, and is communicated with the cap portion.

The present invention also provides a method for constructing a prestressed concrete structure using a composite multi-cap for finishing a fixture fin, comprising the steps of providing a pair of fixtures at both ends, and a concrete structure in which a sheath pipe is disposed between the pair of fixtures, A casting to be embedded in a concrete structure such that a fixing plate provided at one end is exposed to the outside, a fixed anchor head coupled to the fixing plate and having a plurality of steel wire insertion holes, and a wedge inserted into the steel wire insertion hole to fix the steel wire ; Inserting and stretching a steel wire across the pair of fixing holes and the sheath pipe, fixing and cutting the tensioned steel wire to the fixing hole; Providing a composite multi-cap for finishing a fusing unit comprising a cap portion for receiving the anchor head, a plate portion extending from an edge of the cap portion to abut the shape of the fusing plate to correspond to the shape of the fusing plate, and a grouting hole provided at one side of the cap portion; Fixing the composite multi-cap to the fusing plate so that the grouting holes and the grouting holes formed in the fusing plate are in contact with each other; And injecting grout through a grouting hole provided in the complex multi-cap for finishing the finishing hole to fill grout in the sheath pipe and the cap.

According to another aspect of the present invention, there is provided a method of constructing a prestressed concrete structure using a composite multi-cap for finishing a fixture port, comprising the steps of: providing a grout injection pipe in a grouting hole in a fixation hole provided on one side of the concrete structure; A grout discharge pipe is installed in the grouting hole of the fixing hole and then the grout injected through the grout injection pipe is injected until the grout is overflowed to the other side of the grout discharge pipe so that the grout is simultaneously filled in the sheath pipe and the cap portion The grout injection tube and the grout discharge tube are composed of a coupling tube portion that is laterally coupled to the grouting hole and an extension tube portion that extends upward from the coupling tube portion.

The present invention also provides a method for constructing a prestressed concrete structure using a composite multi-cap for finishing a fixture, comprising the steps of: after completion of grout injection through a grout injection pipe, separating the grout injection pipe and the grout discharge pipe until completion of curing of the grout And allowing the grout remaining in the grout inlet tube and the grout outlet tube to be further filled in the sheath tube and the cap portion by the weight of the grout contained in the extension tube portion.

According to the composite multi-cap for finishing the fastener port construction and the method of constructing a prestressed concrete structure using the same, the plate portion is bonded to the fixing plate so as to prevent corrosion of the fixing plate without a separate finish, Grouting is formed in the cap portion by forming the grouting hole on one side, and the anchor head, the steel wire and the wedge accommodated in the cap portion can be sealed and protected.

In addition, according to the composite multi-cap for finishing the fixing port according to the present invention and the method of constructing a prestressed concrete structure using the same, omitting the step of wrapping the end portion of the steel wire with a bird's nest or finishing with concrete, the construction process can be simplified, And the remaining grout is additionally filled in the sheath tube and the cap portion, there is an effect that the grout filling rate can be greatly improved.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

FIG. 1 is a perspective view showing an embodiment of a composite multi-cap for finishing the fixing port according to the present invention, and FIG. 2 is a sectional view of FIG.
FIGS. 3A, 3B and 3C are perspective views showing a composite multi-cap having different shapes of the cap part or the plate part, respectively, corresponding to FIG. 1. FIG.
FIG. 1 is a perspective view showing an embodiment of a composite multi-cap for finishing the fixing port according to the present invention, and FIG. 2 is a sectional view of FIG.
FIGS. 3A, 3B and 3C are perspective views showing a composite multi-cap having different shapes of the cap part or the plate part, respectively, corresponding to FIG. 1. FIG.
4A to 4D are cross-sectional views illustrating respective steps of a method of constructing a prestressed concrete structure according to the present invention.
FIGS. 5A, 5B and 5C are perspective views showing a side view, a plan view, and an eyelet of a conventional prestressed concrete girder, respectively.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention or precedent of the user. Therefore, the definition should be based on the contents throughout this specification.

In the description of the present invention, the same or similar elements are denoted by the same or similar reference numerals, and a detailed description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a composite multi-cap for finishing a fastener according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an embodiment of a composite multi-cap for finishing the fixing port according to the present invention, and FIG. 2 is a sectional view of FIG.

Referring to FIGS. 1 and 2, the composite multi-cap 100 for a fastener finishing structure according to the present invention closes the fastener 210 for a prestressed concrete structure by sealing the outer surface of the fastener- A plate portion 103, and a grouting hole 105.

First, a fixing port 210 for a prestressed concrete structure is installed in a concrete structure 200 such as a bridge girder made of prestressed concrete which is subjected to compressive stress in advance in advance, And an anchor head 220 fixed to the fixing plate 213 and having a plurality of steel wire insertion holes 221 formed thereon, And a wedge 230 that is inserted into the wire 221 and fixes the steel wire 241.

Since the cut steel wire 241, the anchor head 220, the wedge 230 and the fixing plate 213 are exposed to the outside at the end of the fixing hole 210, It is difficult to prevent the corrosion of the fixing plate and the steel wire and the anchor head housed inside the finishing cap because the finishing cap is formed by simply cutting the steel wire and the structure covering only the anchor head.

In order to solve such a problem, the composite multi-cap 100 for finishing a fixing port of the present invention includes a cap part 101 for receiving an anchor head 220, a shape of the fusing plate 213 extending from a rim of the cap part 101, And a grouting hole 105 provided at one side of the cap portion 101. The plate portion 103 is provided with a plate portion 103,

The plate portion 103 is formed so as to correspond to the rim of the fixing plate 213, and the contacting surface is sealed with a sealing material such as silicone, so that corrosion of the fixing plate 213 can be prevented.

A plurality of fixing holes 104 and 215 are formed in the plate portion 103 and the fixing plate 213 and a fixing member 219 such as a bolt is fastened to the fixing holes 104 and 215.

The grouting hole 105 is disposed on the grouting hole 217 formed in the fixing plate 213 and communicates with the cap portion 101. More specifically, the grouting hole 105 has a connecting portion 105a having an inner peripheral surface formed with threads, a first opening 105b provided coaxially with the connecting portion 105a, And a second opening 105c provided between the openings 105b and communicating with the cap portion 101. [

A screw thread is formed on the inner circumferential surface of the connection portion 105a, and a nipple 107 is screwed to the connection portion 105a. A grout injection pipe 110 or a grout discharge pipe 110a is connected to the nipple 107.

The first opening 105b communicates with the grouting opening 217 and the grout 243 injected through the connecting portion 105a is filled into the sheathing tube 240 through the grouting opening 217. [

The second opening 105c communicates with the cap portion 101 to seal the anchor head 220 and the cut steel wire 241 so that a part of the grout 243 injected is filled in the cap portion 101. [

Since the grouting hole 105 having such a structure grooves the sheath tube 240 and the cap portion 101 at the same time, corrosion of the end of the cut steel wire can be thoroughly prevented, and the construction process can be simplified.

FIGS. 3A, 3B and 3C are perspective views showing a composite multi-cap having different shapes of the cap part or the plate part, respectively, corresponding to FIG. 1. FIG.

The composite multi-cap 100 according to the present embodiment can be designed and modified to correspond to the structure or shape of the anchor head 220 and the fusing plate 213 as shown in Figs. 3A and 3B.

For example, when the fusing plate 213 is rectangular, the plate portion 103 of the composite multi-cap 100 is also formed in a rectangular shape as shown in FIG. 3A to cover the fusing plate 213 so as not to be exposed to the outside, It is possible to prevent the fixing plate 213 from being corroded.

3C, the cap portion 101 has a hemispherical shape, and the plate portion 103 differs from the composite multi-cap of FIG. 1 in that the plate portion 103 is formed in a circular shape having a very small width as compared with the plate portion of FIG. have.

The fixing hole 104 is formed at the center of the cap portion 101 instead of omitting the fixing hole formed in the plate portion 103 of Fig. 1 because the width of the plate portion 103 of this embodiment is very small. In this case, a fixing hole 223 corresponding to the fixing hole 104 should be formed in the anchor head 220, and a fixing member 219 such as a bolt is fastened to each fixing hole 223.

As described above, the composite multi-cap 100 according to the present invention can have various shapes and structures according to the structure of the fixing plate 213 and the anchor head 220.

Hereinafter, a method of constructing a prestressed concrete structure using a composite multi-cap for finishing a fixture according to the present invention will be described. Here, the concrete structure is mainly described as a girder.

The method for constructing a prestressed concrete structure using a composite multi-cap for finishing a fastener port according to the present invention includes a step S1 for providing a concrete girder 200, a step S2 for inserting and pulling a steel wire 241, A step S4 of fixing the composite multi-cap 100 on the fixing plate 213, and a step S5 of filling the grout 243.

4A, the concrete girder 200 in the step S1 is provided with a pair of fixing holes 210 at both ends thereof, and a sheath pipe 240 is disposed between the pair of fixing holes 210, Can be produced by pouring and curing.

The fixing unit 210 includes a casting 211 to be embedded in the concrete girder 200 so that the fixing plate 213 provided at one end is exposed to the outside as described above, An anchor head 220 in which a steel wire insertion hole 221 is formed and a wedge 230 inserted into the steel wire insertion hole 221 and fixing the steel wire 241.

In step S2, the steel wire 241 is inserted and stretched across the pair of fixing holes 210 and the sheath pipe 240, and then the tensioned steel wire 241 is fixed to the fixing hole 210 and cut .

The step S3 includes a cap part 101 for receiving the anchor head 220, a plate part 103 extending from the edge of the cap part 101 and contacting the shape of the fusing plate 213 to correspond to the shape of the fusing plate 213, And a grouting hole 105 provided on one side of the cap unit 101. The composite multi-

Referring to FIG. 4B, in step S4, the composite multi-cap 100 is fixed on the fusing plate 213 such that the grouting hole 105 and the grouting hole 217 formed in the fusing plate 213 are in contact with each other .

Referring to FIGS. 4C and 4D, in step S5, the grout is injected through the grouting holes provided in the complex multi-cap for finishing fixture finishing and the grout is filled in the sheath pipe and the cap part.

In the step S5, the grout injection pipe 110 is installed in the grouting hole 105 of the fixing hole 210 provided at one side of the concrete girder 200 and the fixing hole 210 The grout drainage pipe 110a is installed in the grouting hole 105 of the grout injection pipe 110 and then the grout injected through the grout injection pipe 110 is injected until it overflows to the grout discharge pipe 110a The sheath tube 240 and the cap portion 101 are simultaneously filled with grout.

The grout injection tube 110 and the grout discharge tube 110a are formed by a coupling tube portion 111 which is laterally coupled to the grouting hole 105 and an extension tube portion 113 extending upward from the coupling tube portion 111 ) Can be exemplified.

The grout injection pipe 110 and the grout discharge pipe 110a are not separated until the grouting of the grout 243 is completed at the latest after the injection of the grout 243 through the grout injection pipe 110 is completed And the grout 243 remaining in the grout injection pipe 110 and the grout discharge pipe 110a due to the weight of the grout 243 received in the extension pipe portion 113 passes through the sheath pipe 240, (S6) so as to be additionally filled in the container (101).

If the grout having a high viscosity is charged through the grout injection pipe 110 at an injection pressure of 5 to 10 kg / cm 2 in the step S5, even if the grout is injected until it overflows with the grout discharge pipe, An empty space may be formed. This hollow space may cause corrosion of the steel wire and deterioration of durability. In the case where the grout 243 is additionally supplied through the step S6, the air in the empty space is gradually discharged to increase the grout filling rate to improve the durability .

It is to be understood that the invention is not limited to the form set forth in the foregoing description. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

100: composite multi-cap 101: cap part
103: plate portion 104: fixing hole
105: grouting hole 105a:
105b: first opening 105c: second opening
107: Nipple 110: Grout injection tube
110a: Grout drain pipe 111: Coupling pipe
113: extension tube
200: prestressed concrete structure, girder
210: Fixture 211: Casting
213: Fixing plate 215: Fixing hole
217: grouting inlet 219: fixing member
220: anchor head 221: steel wire insertion hole
223: Fixing hole 230: Wedge
240: Sheath tube 241: Steel wire
243: grout

Claims (5)

And a wedge which is inserted into the steel wire insertion hole and fixes the steel wire, the casting comprising: a casting to be embedded in a concrete structure such that a fixing plate provided at one end is exposed to the outside; a fixing anchor head coupled to the fixing plate and having a plurality of steel wire insertion holes; A composite multi-cap for finishing an anchorage for a prestressed concrete structure,
The composite multi-
A cap portion for receiving the anchor head;
A plate portion extending from the edge of the cap portion and abutting against the shape of the fixing plate;
And a grouting hole provided on one side of the cap part.
The method according to claim 1,
The grouting hole
Wherein the cap is disposed on a grout injection port formed in the fixing plate and communicates with the cap portion.
A pair of fixing holes provided at both ends of the fixing structure, and a concrete structure in which a sheath tube is disposed between the pair of fixing holes is provided, the fixing hole includes a casting which is embedded in a concrete structure such that a fixing plate provided at one end is exposed to the outside, A fixed anchor head coupled to the plate and having a plurality of steel wire insertion holes formed therein, and a wedge inserted into the steel wire insertion hole to fix the steel wire;
Inserting and stretching a steel wire across the pair of fixing holes and the sheath pipe, and then fixing and cutting the tensioned steel wire to the fixing hole;
Providing a composite multi-cap for finishing a fusing unit comprising a cap portion for receiving the anchor head, a plate portion extending from an edge of the cap portion to abut the shape of the fusing plate to correspond to the shape of the fusing plate, and a grouting hole provided at one side of the cap portion;
Fixing the composite multi-cap to the fusing plate so that the grouting holes and the grouting holes formed in the fusing plate are in contact with each other;
Filling the grout into the sheath tube and the cap by injecting grout through a grouting hole provided in the composite multi-cap for finishing a fixture;
The method of claim 1 or 2, wherein the method comprises the steps of:
The method of claim 3,
The step of filling the grout comprises:
A grout injection pipe is provided in a grouting hole of a fixing port provided on one side of the concrete structure and a grout discharge pipe is installed in a grouting hole of a fixing port provided on the other side of the concrete structure and the grout injected through the grout injection pipe is connected to the grout discharge pipe And the grout is injected into the sheath tube and the cap part at the same time,
Wherein the grout injection pipe and the grout discharge pipe are composed of a coupling pipe portion that is laterally coupled to the grouting hole and an extension pipe portion that extends upward from the coupling pipe portion. .
5. The method of claim 4,
After the grout injection through the grout injection tube is completed,
The grout injection pipe and the grout discharge pipe are left without separation until the curing of the grout is completed at the latest, and the grout remaining in the grout injection pipe and the grout discharge pipe due to the self weight of the grout in the extension pipe portion, The method comprising the steps of: (a) providing a composite multi-cap for a fastener finishing apparatus;

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