KR102163522B1 - Precast floor plate having level correction unit and construction method of the same - Google Patents

Abstract

Provided are a precast bottom plate and a constructing method thereof, which are more precise than a conventional step correcting method of a precast bottom plate, prevent damage to a girder due to a height adjusting bolt, have a distribution plate integrated with the precast bottom plate to improve the convenience of a bottom plate installing operation, do not cause direct rotation of the distribution plate to reduce a rotational force of a bolt so as to improve workability in a step correcting stage, and conveniently remove a correcting bolt after an operation is completed. According to an embodiment of the present invention, the precast bottom plate comprises: a precast bottom plate body manufactured by installing a tendon or rebar, and then pouring and curing the same with concrete in a factory; a height adjustment unit buried in the precast bottom plate body to adjust an installation height; and a step correction unit including a lower end burying unit fastened to a lower end of the height adjustment unit.

Description

Precast floor plate having level correction unit and construction method of the same}

The present invention relates to a precast floor plate equipped with a step correction unit capable of correcting a level difference of a precast floor plate mounted on a girder through height adjustment, and a construction method using the same, and in particular, integration before mounting the precast floor plate Then, by applying the bottom buried part separated from the height adjustment part due to the destruction of the soft payment agent, it is possible to accurately correct the step with little rotational force without damaging the girder, and remove the correction bolt as necessary after completing the step correction. It relates to a precast floor plate and a construction method provided with a step correction unit capable of.

The concrete deck of the bridge is generally completed through a long period of curing by pouring concrete by making a formwork on site. However, such a conventional method of constructing a floorboard may increase the construction period due to the installation and dismantling of the formwork, and may cause safety accidents due to falling objects, and the concrete floorboard of equal quality due to the site conditions and weather conditions. It is difficult to construct, and there is a fear of various problems such as indirect loss. The construction method using the precast floor plate is a construction method that improves the workability and safety by improving the conventional method of constructing the cast-in-place floor plate.

Precast deck is a method that is divided and manufactured at the factory in consideration of the gap between the bridge width and the girder according to the specifications of the bridge, and then shipped and installed on site.Compared to traditional construction methods, the time required for concrete placement and curing is reduced. It has the advantage of securing a sufficient working space and safety for workers by mounting a precast floor plate on the upper surface of the girder.

However, since such a precast deck is divided and assembled in the field, a joint between the deck and the deck occurs, and a step occurs due to the vertical curve and square of the bridge, and in particular, the PSC girder In the case of the used bridge, the height difference of the entire girder is not uniform due to the difference in age of the concrete and the prestress, so the step of the joint of the deck becomes more severe.

Steps at the joints that occur during the installation work of the precast floor plate are particularly severe in the cantilever part, which hinders the aesthetic appearance after completion, and the thickness of the pavement layer placed on the floor plate is not constant, so there is a risk of damage. After completing the process, follow-up work should be done.

Methods conventionally used to correct the step difference of the precast floor plate include a method of installing between the floor plate and the girder using a rubber pad, and a method of using a height adjustment bolt. Among them, the method using the rubber pad has the disadvantage that it is difficult to correct the minute level difference as the method corrects the step by the height of the rubber pad installed between the bottom plate and the girder, and the method using the height adjustment bolt is a method of using a nut embedded in the bottom plate. By inserting a bolt and adjusting the gap with the girder through rotation of the bolt, it is possible to correct even minute steps, but due to the concentration of stress generated in the girder due to the height adjustment bolt that must support the heavy base plate, There is a risk of damage.

In order to prevent such damage, when the pressure plate is used at the end of the height adjustment bolt, since the height adjustment bolt and the pressure plate are not integrated, there is a risk of an accident due to the fall of the pressure plate. In addition, before performing the installation work of the floor plate, an additional work must be performed that requires pre-arrangement of the pressure plate on the contact surface between the bolt and the girder, and there is a fear that a situation in which the operator repeats the arrangement work due to not being accurately arranged. In order to solve this problem, when the pressure plate is welded to the end of the height adjustment bolt and integrated, the pressure plate rotates together when the bolt is rotated, so the rotational force increases due to the increase in friction as much as the contact area between the pressure plate and the girder. Is lowered. In addition, since the height adjustment bolt cannot be removed after the step correction operation, subsequent work such as cutting the bolt must be accompanied.

As the background technology of the present invention, as Korean Patent Application Publication No. 2002-0083994,'precast concrete flooring' has been proposed. This includes a body having a standardized size and thickness, a nut embedded in the body, and a bolt fastened to the nut to adjust the gradient of the body. However, in the background art, when the precast concrete flooring is installed on the girder and the step is corrected with bolts, the rotational force increases due to the increase in the frictional force of the bolts, thereby reducing workability. In addition, there is a greater risk of damage to the contact surface of the girder.

Korean Patent Application Publication No. 2002-0083994

The present invention is more precise than the conventional method of correcting the step difference of the precast floor plate, prevents damage to the girder due to the height adjustment bolt, improves the convenience of installation work of the floor plate by integrating the pressure plate with the precast floor plate, and Its purpose is to provide a precast deck and a construction method using the same, which improves workability in the step correction step by reducing the rotational force of the bolt because it does not induce direct rotation, and it is convenient to remove the correction bolt after the work is completed.

A precast floor plate according to a preferred embodiment of the present invention includes a precast floor plate body produced by pouring and curing concrete after reinforcement or reinforcement in a factory; A height adjustment unit embedded in the precast base plate body to adjust the installation height; It characterized in that it is provided with; a step correction unit including a bottom buried portion fastened to the bottom of the height adjustment unit.

In addition, the height adjustment unit of the step correction unit includes a buried nut embedded in the body of the precast base plate; It characterized in that it consists of; a correction bolt screwed to the buried nut is installed.

In addition, the bottom buried portion of the step correction unit includes a soft temporary payment agent that has a thread formed therein and can be fastened to the correction bolt; It characterized in that it consists of; acupressure plate integrated with the soft temporary payment through welding.

In addition, the soft finishing agent of the bottom buried part is characterized in that it is made of a low-hardness material such as aluminum and copper so that it can be welded to the pressure plate and can be easily destroyed due to rotation of the correction bolt.

In addition, it is characterized in that the internal thread of the soft payment agent is manufactured with a thickness of less than 1 pitch of the thread formed on the correction bolt.

In addition, the height adjustment part and the bottom buried part are fastened in the manufacturing stage of the precast base plate body, and thus, are integrated in the case of shipping and mounting the base plate.

On the other hand, according to the construction method of a precast floor plate equipped with a step correction unit according to an embodiment of the present invention, a manufacturing step of forming a height adjustment unit by screwing a correction bolt to a buried nut embedded in the precast floor plate body Wow; An integration step of coupling a bottom buried part formed by fastening a soft prepayment welded with a pressure plate to a lower end of the correction bolt; Mounting the precast floor plate transported to the site on the girder; A separating step of rotating the correction bolt of the mounted precast floor plate to induce independent rotation of the correction bolt through destruction of the soft temporary payment agent; A step correction step of adjusting the height of the precast base plate body through rotation of the correction bolt separated from the bottom buried part; And a removal step of removing the correction bolt from the buried nut through rotation of the correction bolt after filling the filler material between the girder and the precast base plate body, and after curing the filler material.

In addition, according to the construction method of a precast floor plate equipped with a step correction unit according to another embodiment of the present invention, a manufacturing step of forming a height adjustment part by screwing a correction bolt to a buried nut embedded in the precast floor plate body Wow; An integration step of coupling a bottom buried part formed by fastening a soft prepayment welded with a pressure plate to a lower end of the correction bolt; Mounting the precast floor plate transported to the site on the girder; A separating step of rotating the correction bolt of the mounted precast floor plate to induce independent rotation of the correction bolt through destruction of the soft temporary payment agent; A step correction step of adjusting the height of the precast base plate body through rotation of the correction bolt separated from the bottom buried part; It characterized in that it comprises; a pouring step of placing concrete on-site to bury the gap and the step correction unit.

In addition, the precast base plate body adjusted to the final height during the step correction step is connected to each other by tightening the fixing nuts fastened to the correction bolt after inserting the joint members having the correction bolt insertion slot holes at both ends into the correction bolt. It is characterized.

According to the precast floor plate provided with the step difference correction unit of the present invention and the construction method thereof, partial damage of the pavement layer is prevented through pavement of an even thickness by finely adjusting the step difference between the joints of the precast floor plate manufactured separately. It is possible to prevent and improve the aesthetics by preventing the adjacent floor plate from appearing misaligned due to the step difference of the floor plate cantilever part after completion.

In addition, since the correction bolt does not directly transmit the weight and working load of the floor plate to the girder, it is distributed and transmitted over a large area through the pressure plate of the bottom buried part, so it is possible to prevent damage to the girder due to stress concentration.

In addition, since the height adjustment unit and the bottom buried part of the step correction unit are connected to each other to be integrated, it is possible to omit preparation work such as arranging the acupressure plate before mounting the floor plate, and the operator's correction work due to an error in the acupressure plate placement is not required. It improves workability and prevents safety accidents caused by falling objects.

In addition, since the height adjustment part and the bottom buried part are separated from each other through the destruction of the soft temporary settlement in the step correction step, the acupressure plate does not rotate due to friction with the contact surface of the girder when the correction bolt for step correction is rotated. There is an effect of improving workability.

In addition, if the correction bolt needs to be removed after completing the step correction operation, since the correction bolt is separated from the bottom buried part, it can be removed only by rotating the correction bolt without subsequent work such as cutting the correction bolt. There is an effect of improving convenience.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea 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 is limited and should not be interpreted.
1 is a perspective view of a precast floor plate according to an embodiment of the present invention.
2 is a cross-sectional view taken along line AA of FIG. 1.
3 is an exploded perspective view of a precast floor plate step correction unit according to the present invention.
(A), (B), (C) of FIG. 4 are various exemplary diagrams according to the end shape of the correction bolt applied to the present invention.
Figure 5 (a), (b), (c) is a perspective view according to various forms of the soft temporary payment applied to the present invention.
6A and 6B are cross-sectional views showing the helical breakage and the breakage of the welded part of the soft temporary settlement agent according to the rotation of the correction bolt of the step correction unit of the present invention.
7 is a perspective view showing an example of mounting a precast floor plate provided with a step correction unit of the present invention.
8A and 8B are process diagrams showing the construction sequence of a precast floor plate equipped with a step correction unit of the present invention.
9A and 9B are cross-sectional views sequentially showing the connection between the correction bolts through the joint member after the step correction operation of the precast floor plate with the step correction unit of the present invention is completed.
10 is a perspective view showing various forms of a joint member applied to the present invention.

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

1 is a perspective view of a precast floor plate according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, and FIG. 3 is an exploded perspective view of a precast floor plate step correction unit according to the present invention.

1 to 3, the precast floor plate 10 is embedded in the precast floor plate body 12 and the precast floor plate body 12 produced by pouring and curing with concrete after reinforcement or reinforcement at the factory. It is characterized in that the step correction unit 20 including a height adjustment unit 21 that can adjust the installation height, and a bottom buried portion 22 fastened to the lower end of the height adjustment unit 21 is provided.

The step correction unit 20 is to correct the step difference between the precast deck body 12 that occurs in the step of the precast deck body 12 being divided and mounted on the upper surface of the girder 100 of the bridge.

The step correction unit 20 is installed at four locations corresponding to the corners of the precast bottom plate body 12 as shown in FIG. 1 in this embodiment, but is not limited to such installation locations or locations. The precast deck body 12 is manufactured in a square shape having a certain thickness (t) by pouring and curing concrete in a formwork reinforced in a factory and then demolding.

The height adjustment unit 21 is composed of a buried nut 211 embedded in the precast bottom plate body 12 and installed, and a correction bolt 212 screwed to the buried nut 211. The buried nut 211 has a screw hole 211a on the central axis and may be buried and installed to have the same length as the thickness t of the precast bottom plate body 12. The correction bolt 212 is installed to have a length longer than the thickness t of the precast base plate body 12.

The ends of the correction bolts 212 may be flat, round, or pointed, as shown in (a), (b), and (c) of FIG. 5.

The bottom buried part 22 is composed of a soft temporary payment agent 221 that can be fastened to the correction bolt 212 by having a thread formed therein, and a pressure plate 222 integrated with the soft temporary payment agent 221 through welding.

The soft processing agent 221 of the bottom buried part 22 can be welded to the pressure plate 222, and at the same time, a soft metal of a low hardness material such as aluminum or copper is used so that it can be destroyed by rotation of the correction bolt 212 This is desirable. The soft payment agent 221 is in the form of a ring or plate with internal threads as shown in Fig. 5 (a), (b), and (c), and a socket shape having a thickness of less than 1 pitch of the thread formed on the correction bolt 212 It can be made of etc.

As shown in Figure 2, by screwing the correction bolt 212 to the buried nut 211 embedded in the precast floor plate body 12, the correction bolt 212 to the lower surface of the precast floor plate body 12 The end of the plate is exposed, but the length of the exposure is to ensure a sufficient length in consideration of the height of the precast base plate body 12 and the height of the grade.

The bottom buried part 22 including the acupressure plate 222 and the soft fastening agent 221 has a height of the lower end of the correction bolt 212 screwed to the buried nut 211 is screwed to the thread of the soft fastening agent 221 It is fastened with the adjustment part 21. Accordingly, the step correction unit 20 applied to the present invention can perform an integrated behavior when shipping and mounting the precast floor plate 10.

The non-explanatory symbol '10a' is a'shear pocket'.

Hereinafter, the construction method of the precast floor plate provided with the step correction unit of the present invention will be described by dividing the construction method of the front precast floor plate and the half sectional precast floor plate construction method.

<Construction method of precast floor plate for front end>

end. Production stage

As shown in FIGS. 1 and 2, the height adjustment part 21 is formed by inserting the correction bolt 212 into the buried nut 211 embedded in the precast base plate body 12.

I. Integration stage

Then, by fastening the acupressure plate 222 and the welded soft prepayment 221 at the bottom of the correction bolt 212 inserted into the buried nut 211, the height adjustment unit 21 and the bottom of the step correction unit 20 are embedded. Unit 22 is integrated.

All. Deferred step

Then, as shown in (a) of FIGS. 7 and 8A, the precast floor plate 10, which has been manufactured, is transported to the site and mounted on the girder 100.

la. Separation step

Then, by rotating the correction bolt 212 of the precast floor plate mounted as shown in (B) of FIGS. 6 and 8A, an independent rotation of the correction bolt 212 is induced through the destruction of the soft temporary payment agent 221. .

hemp. Step correction step

Then, the height of the precast base plate body 12 is adjusted through independent rotation of the lower buried part 22 and the separate correction bolt 212 to correct the step difference. The precast base plate body 12 adjusted to the final height may be connected using the adjacent precast base plate body 12 and the joint member 30 as shown in (A) of FIG. 9. At this time, the joint member 30 may be manufactured in an angle shape of a flat plate or an L-shaped cross section as shown in FIG. 10, and has correction bolt insertion slot holes 301 and 301 at both ends to fit into the correction bolt 212. Therefore, as shown in (B) of FIG. 9, the joint member 30 is located on the upper surface of the adjacent precast base plate bodies 12 and 12, and after inserting the correction bolt insertion slot holes 301 and 301 into the correction bolts 212 and 212, the correction bolt The precast base plate bodies 12 and 12, which have been stepped corrected by tightening the fixing nuts 32 fastened to the (212, 212), are jointly connected to each other.

bar. Removal step

Then, after injection-hardening the filler 110 between the girder 100 and the precast bottom plate body 12 as shown in (D) of FIG. 8B, the buried nut ( The correction bolt 212 is removed from 211) and recovered. Thereafter, as shown in (E) of FIG. 8B, the filler 110 is additionally injected into the screw hole 211a of the buried nut 211.

In this way, in this method, when rotating the correction bolt 212 for step adjustment, the soft temporary settlement agent 221 is destroyed or the welding part 223 is destroyed as shown in FIG. 6, so that the rotation operation is easily performed on the upper surface of the pressure plate 222. . In addition, in this case, the lower end of the correction bolt 212 is supported by the pressure plate 222 and is rotated so that damage to the surface of the girder 100 does not occur.

In addition, there is no fear of falling of the pressure plate 222 because the pressure plate 222 behaves integrally with the precast bottom plate 10 until the soft temporary payment agent 221 is destroyed.

In addition, as in the prior art, before performing the installation work of the bottom plate, the additional work of accurately disposing the pressure plate 222 on the contact surface between the bolt and the girder becomes unnecessary.

In addition, since the correction bolt 212 is removed after the step correction operation, a subsequent operation requiring cutting the bolt as in the prior art is omitted.

<Construction of half-section precast deck>

On the other hand, after the step correction step above in the present method, the step correction unit 20 may be embedded in the concrete by placing the concrete 120 on-site as shown in (D') of FIG. 8B. At this time, the thickness of the cast-in-place concrete 200 is equal to or greater than the height of the head of the correction bolt 212.

Until now, the present invention has been described in detail with reference to the presented embodiments, but those of ordinary skill in the art can make various modifications and modifications 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 modifications and variations of the invention, but is limited by the claims appended below.

10: precast base plate
12: Precast base plate body
20: step correction unit
21: height adjustment unit
22: bottom reclaimed part
211: buried nut
212: correction bolt
221: soft temporary settlement
222: acupressure plate
30: joint member

Claims (9)

In the precast deck 10 installed on the girder 100 of the bridge,
Precast deck body 12 produced by pouring and curing with concrete after reinforcement of a tension member or reinforcement in a factory; A height adjustment part 21 that is embedded in the precast base plate body 12 to adjust the installation height; A step correction unit 20 including a bottom buried part 22 fastened to the lower end of the height adjusting part 21; is provided,
The bottom buried part 22 of the step correction unit 20 includes a soft temporary payment agent 221 that has a thread formed therein and can be fastened to the correction bolt 212; A precast floor plate provided with a step correction unit, characterized in that consisting of; an acupressure plate 222 integrated with the soft temporary payment agent 221 through welding. The method of claim 1,
The height adjustment unit 21 of the step correction unit 20 includes a buried nut 211 embedded in the precast bottom plate body 12; A precast floor plate provided with a step correction unit, characterized in that consisting of; a correction bolt 212 which is screwed to the buried nut 211 and installed. delete The method of claim 1,
The soft temporary payment agent 221 of the bottom buried part 22 can be welded to the pressure plate 222, and at the same time, it is made of a metal of a low hardness material such as aluminum or copper so that it can be easily destroyed due to rotation of the correction bolt 212. Precast floor plate provided with a step correction unit, characterized in that produced. The method of claim 1,
A precast floor plate provided with a step correction unit, characterized in that the thread inside the soft payment agent 221 is manufactured with a thickness (t) less than 1 pitch of the thread formed on the correction bolt 212. The method of claim 1,
The height adjustment part 21 and the bottom buried part 22 are fastened in the manufacturing stage of the precast base plate body 12 to be integrated when shipping and mounting the base plate. Precast equipped with a step correction unit, characterized in that Bottom plate. A manufacturing step of forming a height adjustment part 21 by screwing the correction bolt 212 to the buried nut 211 embedded in the precast base plate body 12;
An integration step of coupling the bottom buried portion 22 formed by fastening the acupressure plate 222 and the welded soft temporary payment agent 221 to the lower end of the correction bolt 212;
Mounting the precast floor plate 10 transported to the site on the girder 100;
A separation step of inducing independent rotation of the correction bolt 212 through destruction of the soft temporary payment agent 221 by rotating the correction bolt 212 of the mounted precast floor plate 10;
A step correction step of adjusting the height of the precast base plate body 12 through rotation of the correction bolt 212 separated from the bottom buried part 22;
Filling the filler 110 between the girder 100 and the precast base plate body 12, and the correction bolt 212 from the buried nut 211 through the rotation of the correction bolt 212 after hardening of the filler 110 ) Removing step of removing; construction method of a precast floor plate provided with a step correction unit, characterized in that it comprises a. A manufacturing step of forming a height adjustment part 21 by screwing the correction bolt 212 to the buried nut 211 embedded in the precast base plate body 12;
An integration step of coupling the bottom buried portion 22 formed by fastening the acupressure plate 222 and the welded soft temporary payment agent 221 to the lower end of the correction bolt 212;
Mounting the precast floor plate 10 transported to the site on the girder 100;
A separation step of inducing independent rotation of the correction bolt 212 through destruction of the soft temporary payment agent 221 by rotating the correction bolt 212 of the mounted precast floor plate 10;
A step correction step of adjusting the height of the precast base plate body 12 through rotation of the correction bolt 212 separated from the bottom buried part 22;
A method of constructing a precast floor plate having a step correction unit comprising; a pouring step of placing concrete on-site to fill the voids and the step correction unit 20. The method according to claim 7 or 8,
After the precast base plate body 12 and 12 adjusted to the final height during the step correction step, the joint members 30 having the correction bolt insertion slot holes 301 and 301 at both ends are inserted into the correction bolts 212 and 212. Construction method of a precast floor plate provided with a step correction unit, characterized in that mutual connection by tightening the fixing nuts 32 fastened to the correction bolts (212, 212).

Images