KR102325276B1 - Half Precast Concrete continuous slab and construction method of the same - Google Patents

Abstract

The present invention relates to a half precast concrete (PC) continuous slab and a construction method thereof. The half PC continuous slab according to a proper embodiment of the present invention comprises: a PC bottom plate made of concrete, wherein a predetermined width and both end portions have cantilever length protruding by a predetermined distance from a point portion of an outermost girder and a blockout portion is formed at a location corresponding to a point portion of each girder to have a through-hole in a direction of thickness, so that a shear connection protruding from the upper part of the corresponding girder can be inserted thereinto; a plurality of steel trusses having lower parts buried into the PC bottom plate and installed in a widthwise direction of the PC bottom plate to protrude from the top surface of the PC bottom plate; and a blockout portion reinforcing material located at each of the blockout portion to have a lower part buried into the PC bottom plate, thereby reinforcing the corresponding blockout portion, wherein the blockout portion reinforcing material includes: a pair of lower fixed plates buried into and fixed to the PC bottom plate; a blockout portion reinforcing bridge protruding from the lower fixed plate through the top surface of the PC bottom plate by predetermined height to connect the lower fixed plate; and an upper fixed plate bonded to the top of the blockout portion reinforcing bridge in a horizontal direction to be incorporated into concrete placed in a field. In addition, adjacent blockout portion reinforcing materials are connected to each other through a pair of lower steel bars and a pair of upper steel bars and a strand buried into the PC bottom plate in order to increase flexure capacity within a section of a negative moment of the half PC continuous slab is bent and placed through the lower steel bars and the upper steel bars and then tension is applied. Accordingly, a construction period can be shortened and excellent working safety can be ensured due to convenient construction thereof in a field.

Description

Half Precast Concrete continuous slab and construction method of the same

The present invention relates to a half-PC continuous slab used for constructing a concrete floor plate and a construction method thereof, and in particular, a single half-PC continuous slab is extended by the length of a cantilever through a block-out part without the influence of a shear connector on the branch side of a girder. By introducing tension force to the strand without going through the block-out part, the cross-section (bending, shearing, resistance) reinforcement of the negative moment section can be increased. It relates to a half PC continuous slab and a construction method thereof.

In general, girder bridges are constructed by placing girders on abutments and piers and then pouring concrete on the upper surface of the girder to construct the deck. In order to pour concrete in this way, a form must be used, and in this case, the installation and dismantling of the form takes a long time, and a fall accident due to the carelessness of the operator may occur. apply However, even in the case of applying this half PC slab, in order to construct the cantilever parts at both ends (both ends of the bridge deck), separate cantilever copper bars and formwork must be installed, so the delay in construction and worker safety cannot be solved. Therefore, there is a need for a PC slab capable of constructing the end cantilever part without the need for a separate formwork and a construction method thereof.

As the background technology of the present invention, as Korean Patent Registration No. 10-0728106, 'the cantilever part installation structure and construction method of the bridge deck' is proposed. This allows the final bridge deck cantilever part to be constructed by binding the panel form consisting of the panel support plate and the reinforcing rib to the support fixing means fixed in advance to the upper surface of the bridge girder. This is to make it easy to construct. However, in this case as well, since a separate panel formwork must be installed, it is difficult to shorten the construction period, and there is a problem with safety because it is necessary to work at height to fix the panel formwork to the upper surface of the girder for the bridge.

As another technology that is the background of the present invention, as Korean Patent Registration No. 10-1883413, a 'supporting bracket installation structure' is proposed. This can be quickly and easily installed on the girder to support the formwork for pouring the bottom plate of the bridge, and if it is not dismantled after installation, it can reduce the safety accident rate of air and workers, and it can be dismantled if necessary. It is designed to simplify and reduce weight, and to minimize its own weight as it is manufactured by welding steel materials, and to satisfy structural stability that can stably transmit the load to the girder. However, in this case as well, it is difficult to shorten the construction period as well as reduce the work safety because the installation of the support plate and the formwork is required.

Korean Patent Registration No. 10-0728106 Korean Patent Registration No. 10-1883413

According to the present invention, a single half PC continuous slab can be installed by extending the length of the cantilever through the block-out portion without the influence of the shear connector on the branch side of the girder. The purpose is to provide a half-PC continuous slab that can increase cross-section (bending, shearing, resistance) reinforcement, and is easy to construct on site, which shortens the construction period and has excellent work safety and a construction method thereof.

Half PC continuous slab according to a suitable embodiment of the present invention

Each of the cantilever lengths with a certain width and both ends protrude by a certain amount from the fulcrum of the outermost girder is penetrated in the thickness direction at each position corresponding to the fulcrum of each girder and the shear connector protruding from the upper part of the girder is inserted. A PC floor plate made of concrete with a block-out portion formed to make it possible;

a reinforcing bar truss having a lower portion buried in the PC floor plate and at the same time being installed in a plurality in the width direction of the PC floor plate and protruding from the upper surface of the PC floor plate;

It includes; a block-out reinforcing material that is respectively located in the block-out portion and has a lower portion buried in the PC bottom plate to reinforce the corresponding block-out portion.
The block-out part reinforcement,
A pair of lower fixing plates that are buried and fixed in the PC base plate, a block-out part reinforcement bridge that protrudes a certain height above the upper surface of the PC bottom plate from the lower fixing plate, and connects the lower fixing plates. Horizontal posture at the top of the block-out part reinforcement bridge It is composed of an upper fixing plate that is joined with cast-in-place concrete and synthesized in concrete.
The adjacent block-out reinforcements are connected to each other through a pair of lower steel rods and a pair of upper steel rods. In order to increase the bending strength of the negative moment section of the half PC continuous slab, the stranded wire embedded in the PC floor plate is It is characterized in that the tension force is introduced after being bent through each pair of lower and upper steel bars.

delete

delete

In addition, the strand is characterized in that the tension is made after being mounted through a rolling cap that is freely inserted into the pair of lower steel rods and the pair of upper steel rods, respectively.

In addition, the block-out part reinforcement bridge is characterized in that a trapezoidal side opening is formed in order to increase the composite force with the cast-in-place concrete.

In addition, the block-out part reinforcing material is joined to the side of the block-out part reinforcement bridge and a guide tube for bending the strand is installed, and the strand embedded in the PC bottom plate to increase the bending strength of the negative moment section is in the negative moment section. It is characterized in that the tension force is introduced after being inserted into the guide tube for changing the direction of the strand and bent over.

In addition, a plurality of bolt boxes are installed along the long sides of both sides of the upper surface of the PC floor plate, and a plurality of height adjustment bolts protruding upward are fixedly installed in the bolt box, so that the connection between adjacent half PC continuous slabs and It is characterized in that the height adjustment is made by assembling the joint steel material to the height adjustment bolt installed on one half PC continuous slab and the height adjustment bolt installed on the other half PC continuous slab, and then tightening the nut.

On the other hand, the concrete floor plate construction method of the bridge using the half PC continuous slab according to the present invention,

After the half PC continuous slab is provided and lifted to the upper part of the girder, the half PC continuous slab is mounted on the branch part of the girder so that the shear connector protruding from the upper part of the girder is located in the blockout part;

Reinforcing additional reinforcement on-site on the upper part of the half PC continuous slab;

It is characterized in that it is constructed including; pouring cast-in-place concrete so that reinforcing bars are buried in the upper part of the half PC continuous slab.

Here, each time the lifting and mounting of the half-PC continuous slabs are repeated, interconnecting the adjacent half-PC continuous slabs; however, if connection and height adjustment between the adjacent half-PC continuous slabs are required, one side of the half-PC continuous slab is continuous It is characterized in that it is made by assembling the joint steel material to the bolt for height adjustment installed in the bolt box of the slab and the bolt for adjusting the height installed in the bolt box of the other half PC continuous slab, and then fastening the nut.

According to the half-PC continuous slab and its construction method of the present invention, the half-PC continuous slab is mounted on the girder through the block-out portion without interference of the shear connecting member installed at the branch portion of the girder, and can be installed to extend the length of the cantilever. In addition, since the block-out part reinforcement is installed in the block-out part, the shear strength of the half PC continuous slab is strengthened. In addition, tension force can be introduced to the strand using the block-out part reinforcement without going through the block-out part, so the cross-section (bending, shearing, resistance) reinforcement in the negative moment section can be increased, and the half PC continuous slab is installed and then cast on site. Since the floor plate is constructed of concrete, construction at the site becomes easy, and the installation of a formwork becomes unnecessary, providing the advantages of shortening the construction period and excellent work safety.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so the present invention is limited to the matters described in the accompanying drawings It should not be construed as being limited.
Figure 1a is a state diagram of a half PC continuous slab is lifted and mounted on a girder according to an embodiment of the present invention.
FIG. 1B is a plan view of FIG. 1A and is an exemplary view of a partial section.
Figure 2 is a cross-sectional view of the half PC continuous slab shown in Figure 1a.
Figure 3a is a longitudinal cross-sectional view of the block-out portion side of the half-PC continuous slab according to the present invention.
Figure 3b is a three-dimensional installation state of the block-out portion reinforcement shown in Figure 3a.
Figure 4a is a longitudinal sectional view of the block-out portion side of the half PC continuous slab of another type according to the present invention.
Figure 4b is a state diagram in which the stranded wire is tensioned on the block-out part reinforcement shown in Figure 4a.
Figure 5 is an exemplary view showing various forms of the block-out portion reinforcement shown in Figure 4b.
Figure 6 is a state diagram in which the strand is inserted into the guide tube for bending the strand bonded to the block-out part reinforcement according to the present invention.
Figure 7a is a plan view of the joint portion between the half PC continuous slab according to the present invention.
7b and 7c are state diagrams before and after height adjustment showing a state in which the connection between the half PC continuous slabs according to the present invention is made through a joint steel material and a height adjustment bolt.
Figure 8a is a state diagram in which the cast-in-place concrete is constructed after the half PC continuous slab is mounted on the girder according to the embodiment of the present invention.
Fig. 8b is an enlarged view of the block-out part reinforcement shown in Fig. 8a;

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto.

The half PC continuous slab 100 according to the present embodiment is installed on a plurality of girders 10 parallel to each other as shown in FIGS. 1A and 1B . In this embodiment, two girders 10 are arranged side by side, but one or more girders may be additionally arranged therebetween.

The half PC continuous slab 100 has a predetermined width W and a cantilever length L1 at which both ends protrude further by a predetermined amount from the point of the outermost girder 10, respectively. Therefore, the total length (L) of the half PC continuous slab 100 is made equal to the width of the bridge including the cantilever length (L1). In addition, the half-PC continuous slab 100 is penetrated in the thickness direction at each position corresponding to the point portion of each girder 10 and is a block-out portion so that the shear connector 12 protruding on the upper portion of the girder 10 can be inserted. 112 is formed and made of concrete. The block-out part 112 provides a sufficient space to accommodate the shear connector 12 so that the cast-in-place concrete 190 is filled during the construction of the bridge top plate as shown in FIG. 8 . The shear connector 12 may have a T, Π shape, or the like.

A plurality of reinforcing bar trusses 120 are installed on the PC bottom plate 110 . Reinforced truss 120 is combined with cast-in-place concrete 190 to be poured on top of the PC floor plate 110 to improve the shear strength of the half PC continuous slab 100 . The reinforcing bar truss 120 has a lower portion embedded in the PC floor plate 110 and the remaining portion protrudes from the upper surface of the PC floor plate 110 . The reinforcing bar truss 120 is a bending material connecting the upper lattice muscle 121, the lower joint 122 joined to the lower part of the lattice muscle, the upper lattice muscle 121 and the lower joint 122, as is well known. 123).

Here, since the reinforcing bar truss 120 passing through the block-out part 112 is cut, the block-out part reinforcement 130 for reinforcing the block-out part 112 is installed. The block-out part reinforcing material 130 is respectively located in the block-out part 112 and at the same time the lower part is buried in the PC bottom plate 110 to reinforce the corresponding block-out part 112 . As such, the block-out reinforcing material 130 should have a structure capable of not only reinforcing the block-out portion 112 , but also avoiding the interference of the girder 10 side shear connector 12 , and installing the stranded wire 114 if necessary.

To this end, the block-out part reinforcement 130 is a pair of lower fixing plates 131 and 131 that are buried and fixed in the PC bottom plate 110 as shown in FIGS. 3A and 3B, and the PC bottom plate 110 in the lower fixing plates 131 and 131 . The block-out part reinforcement bridge 132 that protrudes a certain height above the upper surface of the lower fixing plate 131 and 131 and connects the lower fixing plate 131 and 131, and the block-out part reinforcement bridge 132 is joined in a horizontal position to the top of the upper fixing plate and synthesized in the cast-in-place concrete. (133). The block-out reinforcing material 130 may be manufactured by cutting, for example, H-beam steel to have such a configuration.

Preferably, the block-out part reinforcement bridge 132 is formed with a trapezoidal side opening (132a) in order to increase the composite force with the cast-in-place concrete. The shape of the block-out part reinforcement bridge 132 and the side opening part 132a may be various trapezoidal shapes as shown in FIG. 5 .

On the other hand, the half PC continuous slab 100 of the present invention may appear in two cross-sectional shapes in a state in which the block-out portion 112 and the block-out portion reinforcement 130 are installed. That is, the half PC continuous slab 100 is when the longitudinal main reinforcing bars 111 are installed on the PC bottom plate 110 as shown in FIG. 3A and when the strand 114 is installed on the PC bottom plate 110 as shown in FIG. 4A . may appear as

Therefore, when the strand 114 is installed on the PC bottom plate 110, the strand 114 is bent using the block-out part reinforcing material 130, so that the bending strength of the negative moment section of the half PC continuous slab 100 can be made to increase.

The first form for this is to connect a pair of lower steel rods 142 and 142 and a pair of upper steel rods 144 and 144 between the block-out part reinforcements 130 and 130 facing each other as shown in FIGS. 4A and 4B, and the PC bottom plate 110 ) is bent through each pair of the lower steel bar 142 and the upper steel bar 144, and then the tension force is introduced, thereby increasing the bending strength of the negative moment section of the half PC continuous slab 100. can increase

At this time, the strand 114 may be tensioned after being mounted through the rolling cap 143 which is freely inserted into the pair of lower steel bars 142 and 142 and the pair of upper steel bars 142 and 142, respectively. In this case, the strand 114 can be tensioned without friction by using the rolling cap 143 .

In the second form, a guide pipe 136 for bending a strand bonded to the side of the block-out reinforcement bridge 132 of the block-out reinforcement 130 is installed as shown in FIG. 6, and a strand to be embedded in the PC bottom plate 110 ( 114) can be inserted into the guide pipe 136 for changing the direction of the strand, and then the bending strength of the negative moment section of the half PC continuous slab 100 can be increased by introducing a tension force after being bent.

As such, the present invention realizes the reinforcement of the block-out part 112 through the block-out part reinforcement 130 when the stranded wire is not applied to the half PC continuous slab 100 having the block-out part 112, and the half PC When the stranded wire 114 is applied to the continuous slab 100 , prestress can be introduced through the bending arrangement of the stranded wire 114 to the block-out part reinforcement 130 .

On the other hand, for the joint between the adjacent half PC continuous slab 100 and 100, the bolt box 150 is installed in a plurality of places along the long side of both sides of the upper surface of the PC bottom plate 110 as shown in FIG. 7, and the bolt box ( 150), a plurality of height adjustment bolts 160 protruding upward may be fixedly installed and configured.

Therefore, when connecting between the adjacent half-PC continuous slabs 100 and 100 as shown in FIGS. 7b and 7c, the height adjustment bolt 160 installed on one half-PC continuous slab 100 and the other half-PC continuous slab 100 are installed on the other side. After assembling the joint steel material 170 to the height adjustment bolt 160 , the height can be adjusted by tightening the nut 162 . The joint steel material 170 may have I and ┻ shapes.

A construction method of the half-PC continuous slab 100 configured in this way will be described.

First, after lifting the half PC continuous slab 100 to the upper part of the girder 10 as shown in FIG. 1A , the shear connecting material 12 protruding from the upper part of the girder 10 is located in the block-out part 112 . The half PC continuous slab 100 is mounted at the point of (10).

Then, as shown in Figure 8a, the additional reinforcement 180 on the top of the half PC continuous slab 100 is reinforced on-site.

Next, the cast-in-place concrete 190 is poured so that the reinforced reinforcing bar 180 is embedded in the upper part of the half PC continuous slab 100 . Therefore, the cast-in-place concrete 190 is also filled in the block-out portion 112 so that the shear connector 12 on the girder 10 side is synthesized with the cast-in-place concrete 190 and is connected to the block-out portion reinforcement 130 .

Here, it is preferable to interconnect the adjacent half-PC continuous slabs 100 and 100 before pouring the cast-in-place concrete 190, that is, whenever the lifting and mounting of the half-PC continuous slab 100 is repeated.

At this time, as shown in FIGS. 7b and 7c , the height adjustment bolt 160 installed in the bolt box 150 of the one half PC continuous slab 100 and the height adjustment bolt installed in the bolt box 150 of the other half PC continuous slab 100 are installed in the bolt box 150 . After assembling the joint steel material 170 to 160, the nut 162 is fastened to connect the adjacent half PC continuous slabs 100 and 100 and adjust the height.

As described above, according to the present invention, the half PC continuous slab 100 has a length corresponding to the width of the bridge and is not affected by the shear connector 12 through the blockout part 112 at the point part of the girder 10. It can be mounted on the girder 10, and the block-out part 112 is reinforced by the block-out part stiffener 130 to increase the cross-sectional force (bending, shearing) at the point part of the half PC continuous slab 100. . In addition, when it is intended to introduce tension force through the strand 114 to the half PC continuous slab 100 , the upper and lower steel bars 143 and 142 or the guide for bending the strand 114 are installed in the block-out part reinforcement 130 . By using the tube 136 to be bent and mounted to introduce a tension force, the tension force is introduced at the upper end of the negative moment of the half PC continuous slab 100 to further improve the cross-sectional rigidity.

In addition, in the present invention, when the bottom plate of a bridge is constructed through the half PC continuous slab 100, a separate PC cantilever must be manufactured as in the prior art, or construction such as installation and reinforcement of the cantilever formwork at the site is unnecessary. and the air is shortened.

So far, the present invention has been described in detail with reference to the presented embodiments, but those skilled in the art can make various modifications and modified inventions without departing from the technical spirit of the present invention with reference to the presented embodiments. will be. The present invention is not limited by such variations and modifications, but only by the claims appended below.

100: half PC continuous slab
110: PC bottom plate
120: reinforced truss
121: lattice muscle
122: Ha Yeon-jae
123: bending material
130: block-out part reinforcement
131: lower fixing plate
132: block-out part reinforcement bridge
132a: side opening
133: upper fixing plate
136: guide tube for bending strands
142: lower steel bar
143: rolling cap
144: upper steel bar
150: bolt box
160: bolt for height adjustment
170: joint steel

Claims (9)

In the half PC continuous slab 100 installed on a plurality of girders 10 in parallel with each other,
A predetermined width W and both ends each have a cantilever length L1 that protrudes by a predetermined amount from the branch of the outermost girder 10, and penetrates in the thickness direction at each position corresponding to the branch of each girder 10 A PC bottom plate 110 made of concrete with a block-out portion 112 formed so that the shear connector 12 protruding from the upper portion of the girder 10 can be inserted;
A reinforcing bar truss 120 protruding from the upper surface of the PC base plate 110 by installing a plurality of or more in the width direction of the PC base plate 110 at the same time as the lower part is buried in the PC base plate 110 ;
The block-out part reinforcement 130 which is respectively located in the block-out part 112 and is buried in the PC bottom plate 110 at the same time to reinforce the corresponding block-out part 112; includes;
The block-out part reinforcement 130 is,
A block connecting the lower fixing plates 131 and 131 by protruding at a certain height above the upper surface of the PC bottom plate 110 from a pair of lower fixing plates 131 and 131 that are buried and fixed in the PC bottom plate 110, and the lower fixing plates 131 and 131 It consists of an upper fixing plate 133 that is joined to the upper end of the reinforcement bridge 132 and the block-out reinforcement bridge 132 in a horizontal position and synthesized in cast-in-place concrete,
The adjacent block-out part reinforcements 130 and 130 are connected to each other through a pair of lower steel bars 142 and 142 and a pair of upper steel bars 144 and 144, and the bending strength of the negative moment section of the half PC continuous slab 100 is To increase, the strand 114 embedded in the PC bottom plate 110 is bent through each pair of the lower steel bar 142 and the upper steel bar 144, and then the tension force is introduced. slab. delete delete The method of claim 1,
The strand 114 is a pair of lower steel rods 142 and 142 and a pair of upper steel rods 142 and 142 respectively rotatably inserted through a rolling cap 143 after being mounted through a rolling cap 143, characterized in that the tension is made. slab. The method of claim 1,
Half PC continuous slab, characterized in that the block-out part reinforcement bridge (132) is formed with a trapezoidal side opening (132a) in order to increase the composite force with the cast-in-place concrete. The method of claim 1,
The block-out part reinforcing material 130 is joined to the side of the block-out part reinforcement bridge 132 and a guide pipe 136 for bending a strand is installed, and a PC bottom plate 110 to increase the bending strength of the negative moment section. A half-PC continuous slab, characterized in that the strand 114 embedded in the negative moment section is inserted into the guide pipe 136 for changing the direction of the strand, and then the tension is introduced after being bent. The method of claim 1,
A plurality of bolt boxes 150 are installed along the long sides of both sides of the upper surface of the PC bottom plate 110, and a plurality of height adjustment bolts 160 that protrude upward are fixedly installed in the bolt box 150. , the height adjustment bolt 160 installed on one side half PC continuous slab 100 and the height adjustment bolt 160 installed on the other half PC continuous slab 100 for connection and height adjustment between the adjacent half PC continuous slabs 100 and 100 ) after assembling the joint steel 170 to the half PC continuous slab, characterized in that it is made by adjusting the tightening of the nut 162. After the half PC continuous slab 100 of claim 1 is provided and lifted to the upper part of the girder 10, the girder so that the shear connector 12 protruding from the upper part of the girder 10 is located in the block-out part 112 (10) mounting the half PC continuous slab 100 at the point of step;
On-site reinforcement of additional reinforcing bars 180 on the upper part of the half PC continuous slab 100;
Concrete floor plate of a bridge using a half PC continuous slab, characterized in that it is constructed including; construction method. 9. The method of claim 8,
Each time the lifting and mounting of the half-PC continuous slab 100 is repeated, interconnecting the neighboring half-PC continuous slabs 100 and 100 with each other;
When the connection between the adjacent half PC continuous slabs 100 and 100 and height adjustment are required, the height adjustment bolt 160 installed in the bolt box 150 of the one half PC continuous slab 100 and the other half PC continuous slab 100 ), a concrete floor plate construction method of a bridge using a half-PC continuous slab, characterized in that it is made by assembling the joint steel material 170 to the height adjustment bolt 160 installed in the bolt box 150 of the . .

Images