KR20200085573A - Gravity type leveling method for precast members including expansion joint - Google Patents

Abstract

The present invention relates to a method for installing a precast member of an expansion joint and, more specifically, to a gravity type leveling method for a precast member of an expansion joint, which fixes a pair of precast members of expansion joints by a steel frame beam, inserts the precast members of the expansion joints between preinstalled floor plates to adjust leveling of the precast members of the expansion joints in a state of holding the steel frame beam on upper surfaces of the preinstalled floor plates, and then places non-shrink mortar after the steel frame beam is removed when the leveling is completed.

Description

GRAVITY TYPE LEVELING METHOD FOR PRECAST MEMBERS INCLUDING EXPANSION JOINT}

The present invention relates to an installation method of a telescopic joint precast, and in detail, a pair of telescopic joint precasts are fixed with a steel beam, and then a steel beam is pre-installed by inserting a telescopic joint precast between the pre-installed floor plates. It relates to a gravity leveling method of a telescopic joint precast member that adjusts the leveling of the telescopic joint precast in a state mounted on the upper surface of the plate, and then removes the steel beam when the leveling is completed, and then pours a non-shrinkable mortar.

The expansion joint is installed in the gap between the upper and lower floors of the bridge superstructure, and it accommodates the displacement and deformation caused by repeated contraction and expansion by the temperature change and the continuous load of the vehicle driving the bridge. It is a device that plays an important role in allowing the bridge to safely drive and preventing the corrosion of the bridge bearing or concrete by introducing the surface water and various dirts into the lower part.

Currently, the new joint construction technology forms an installation space where telescopic joints can be inserted into the opposite deck of the superstructure of the bridge, and is fixed and welded to the main structure of the superstructure by using telescopic joints and reinforcing bars in the field. It is being constructed in a rather complicated way to integrate with the superstructure by pouring concrete.

Accordingly, when installing a new construction site of a new joint and replacing a public site, the amount of carbon generated by the construction of concrete on site is increased, and it is difficult to partially replace it without damaging the structure, thereby extending the life of the bridge and the new joint and shortening the air.

For example, when the structure is a bridge, the bridge is composed of a plurality of bottom piers and a plurality of bottom plates that are seated on the top of the bridge to form a road, and both bottom plates are connected to the end bottom plate and the end bottom plate. In order to accommodate the dynamic behavior of a smoothly, a clearance is provided with an appropriate joint gap width.

In addition, it is possible to contaminate or corrode the lower facilities of the bridge by flowing and dropping rainwater or various foreign substances through the gap, while allowing the vehicle traveling from the top to run smoothly by closing and closing the gap in the horizontal direction. In order to prevent the stretchable expansion joints are installed in the play.

Since the expansion joint directly affects the safety and durability of the structure, it is the most damaged and replaceable element among the entire structure of the structure, so basically it must be able to provide the expansion and contraction functions perfectly and durable. It should also have excellent resistance to UV rays and various chemicals when exposed, and it should be possible to reduce construction traffic control as much as possible due to rapid construction.

However, in order to replace or repair the conventional expansion joints, the fused concrete is cut and shredded in the installation space forming portion where the expansion joints are inserted to separate the expansion joints from the bottom plate, insert new expansion joints, and then cast concrete again. It goes through a series of processes.

Accordingly, it is possible to cause structural problems of the floor plate concrete in the process of cutting and separating the futa concrete at the time of replacing or repairing the new joint. In addition, when the replacement operation using the series of processes is used, a lot of time and resources are put into dismantling, and the replacement time of the new joint after the re-installation of the new joint is required, so it takes a long time to replace.

In order to solve this problem, a method of connecting a concrete non-pouring bridge, which is Korean Patent Registration No. 10-1127561, is disclosed.

The concrete non-pouring bridge connection method includes preparing a first non-contraction concrete portion and a second non-contraction concrete portion, and a first joint and a second non-contraction concrete portion and the second non-contraction concrete portion, respectively. Preparing a new joint by connecting a joint, preparing a first support portion and a second support portion spaced apart from each other, and the first joint portion having the first non-contraction concrete portion and the second non-contraction concrete portion It is provided between the second support and the step of connecting the first support and the second support.

However, such a conventional method of connecting a concrete-less bridge is required to form a stepped portion with a concrete breaker to allow the insertion of a telescopic joint device in a part of the end floor plate, thereby increasing carbon generation, causing noise dust and damage to the structure, and in complex processes. The construction time is increased, resulting in excessive construction costs, problems such as traffic jams, and a separate non-contraction concrete part on the floor plate is constructed by post-construction. There is a problem that a leak occurs between the gaps.

In addition, such a conventional method of connecting a concrete non-casting bridge is difficult to simultaneously lift the unconstricted concrete portion and the expansion joint of the weight composed of a pair at both ends of the girder, resulting in rotation or uneven deflection during construction and transportation. There is another problem that the shrinking concrete portion and the elastic teeth are damaged. That is, the type in which the expansion joints such as the rail type and the monocell type are integrally formed in the longitudinal and transverse directions is not applicable, and there is a problem in that the construction time is increased when constructing the steel finger-type expansion joint capable of separating and lifting.

In order to solve this problem, a method of constructing a precast floor plate with a new joint, which is a domestic registered patent No. 10-1693767, has been filed and disclosed by the applicant.

The precast floor plate construction method with the expansion joint is a space forming process (S10) to form a space so that the upper part of the bridge girder is exposed between the existing floor plates to enable installation of the expansion joint as shown in FIG. And, the shear connecting material installation process (S20) for installing the vertical shear connecting material on the upper girder, and the expansion joint precast bottom plate integrally formed with the expansion joint to have a pocket on the corresponding portion to insert the vertical shear connecting material After manufacturing, the expansion joint precast bottom plate manufacturing process (S30) for coupling the lifting device to the expansion joint precast bottom plate, and after transporting the expansion joint precast floor plate to the installation site, the lifting equipment is mounted on the lifting device. After binding, the seating process (S40) for lifting and seating on the top of the girder, the lifting device removing process for removing the lifting device (S50), and between the pocket and the expansion joint precast bottom plate and the pre-installed bottom plate It consists of a shrinking mortar pour process (S60) to pour shrink mortar.

However, since the conventional method for constructing a precast floor plate with a stretch joint is removed immediately after the lifting device is seated on the girder, an operator is stretched to adjust the level of the stretch joint precast floor plate and a pre-installed floor plate. Additional time is required because a separate leveling operation is performed while a thin plate is inserted under the joint precast bottom plate.

Domestic patent registration No. 10-1127561 Domestic patent registration No. 10-1693767

The present invention is to solve the above problems, and a pair of telescopic joint precasts are fixed with a steel beam, and then a telescopic joint precast is inserted between the pre-installed floor plates to mount the steel beams on the pre-installed upper floor plate. It is an object of the present invention to provide a gravity leveling method of a telescopic joint precast member that adjusts the leveling of the telescopic joint precast in one state and then removes the steel beam when the leveling is completed, and then pours a non-shrinkable mortar.

Features of the present invention for achieving the above object,

A space forming process of forming a space such that the upper part of the girder of the bridge is exposed between the pre-installed floor plates to enable the installation of the expansion joint;

A shear connection material installation process for installing a vertical shear connection material on the upper side of the girder;

The expansion joint is integrally formed to have a pocket on a corresponding portion so that the vertical shear connecting material is inserted, a plurality of first bolt members are vertically projected on the upper surface, and a second bolt member is installed and installed at each corner of the bottom surface. An expansion joint precast production process of prefabricating a joint precast and coupling a steel beam to a first bolt member of the expansion joint precast; After transporting the telescopic joint precast to the installation site, the lifting equipment is bound to the steel beam and then lifted to insert the telescopic joint precast between the pre-installed floor plates and placed on the upper surface of the girder, but at both ends of the steel beam. And seating process for mounting each on the upper surface of the previously installed bottom plate; A leveling process of rotating the fixing nut to lower the stretch joint precast to match the level with the previously installed bottom plate; A leveling maintenance step of lowering the second bolt member of the telescopic joint precast to maintain leveling by interviewing with the upper surface of the girder when the level is matched; A removing step of removing the steel beam and the first bolt member from the expansion joint precast; And a non-shrinking mortar to be poured between the stretched joint precast and the pre-installed base plate, between the bottom surface and the top surface of the stretched joint precast, and to the portion where the first bolt member is removed and the portion where the second bolt member is formed. It is characterized by consisting of a shrink mortar pouring process.

Here, the expansion joint is one of a strong finger type, rail type, monocell type is selected.

Here, also, the expansion joint precast is formed to have a height smaller than the height of the previously installed base plate.

Here, the steel beam has a cross-sectional shape of "H" or "I", and a plurality of longitudinally installed precasts are provided in the pair.

Here, the steel beam adds a transverse steel beam having a cross-sectional shape of "H" or "I" on the top surface to prevent bending when the load of the telescopic joint precast is relatively heavy or relatively long. With bolts.

Here, the first bolt member is installed inside the expansion joint precast, and a first binding nut having a first shear key formed thereon; A first cap welded to the upper portion of the first binding nut; A first guide tube inserted into an upper surface of the first cap and extending to an upper surface of the telescopic joint precast; And the lower end is coupled to the first binding nut, the other end is made of a tanned fixing bolt protruding to the upper surface of the expansion joint precast.

Here, the second bolt member is installed inside the bottom edge of the telescopic joint precast, and a second binding nut having a second shear key formed on the outside; A second cap welded to the upper portion of the second binding nut; A second guide tube inserted into an upper surface of the second cap and extending to an upper surface of the telescopic joint precast; And a leveling retaining bolt coupled to the second binding nut and projecting to the bottom surface of the telescopic joint precast when descending.

According to the gravitational leveling method of the stretch joint precast member according to the present invention configured as described above, a pair of stretch joint precasts are fixed with a steel beam, and then a steel joint beam is inserted by inserting a stretch joint precast between the base plates. Adjust the leveling of the expansion joint precast while mounted on the top of the installed base plate, and when leveling is completed, remove the steel beam and pour non-contraction mortar to simplify the leveling of the expansion joint precast to shorten construction time By reducing construction time and construction cost, it is possible to minimize complaints about traffic jams.

In addition, according to the present invention, the quality and durability of the expansion joint precast are excellent in manufacturing in the form of a precast, and the defect rate is reduced and maintenance cost can be reduced by reliably integrating and fixing the expansion joint precast.

In addition, according to the present invention, it can be prevented from being damaged due to rotation or uneven deflection because the elastic joint precast is firmly fixed and moved by the steel beam during construction and transportation.

1 is a process diagram for explaining a method for constructing a precast floor plate with a conventional expansion joint.
Figure 2 is a perspective view showing the appearance of a stretch joint precast applied to the gravity leveling method of the stretch joint precast member according to the present invention.
3 is a partial cross-sectional view taken along line AA of FIG. 2.
4 is a partial cross-sectional view taken along line BB of FIG. 2.
5 is a perspective view showing a state in which a steel beam is combined with a telescopic joint precast applied to a gravity leveling method of a telescopic joint precast member according to the present invention.
6 is a perspective view showing the configuration of a telescopic joint precast applied to the gravity leveling method of a telescopic joint precast member according to another embodiment of the present invention.
7 is a process diagram for explaining the gravity leveling method of the expansion joint precast member according to the present invention.
8A to 8H are explanatory diagrams for explaining the construction process of the gravity leveling method of the telescopic joint precast member according to the present invention.

The configuration of the expansion joint precast base plate and the lifting device applied to the gravity leveling method of the expansion joint precast member according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

2 is a perspective view showing a state of a stretch joint precast applied to a gravity leveling method of a stretch joint precast member according to the present invention, FIG. 3 is a partial cross-sectional view along AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB in FIG. , FIG. 5 is a perspective view showing a state in which a telescopic joint precast and a steel beam applied to a gravity leveling method of a telescopic joint precast member according to the present invention are combined, and FIG. 6 is a telescopic joint precast according to another embodiment of the present invention It is a perspective view showing the structure of the expansion joint precast applied to the gravity leveling method of the member.

1 to 6, the stretched joint precast 10 according to the present invention is manufactured by a pair of precast production methods so as to be symmetric to each other in the same size, and the stretched joint 20 is formed integrally at each end. do. At this time, the expansion joint precast bottom plate 10 is formed to have the same size as the width of the road so that construction is performed at one time, and the expansion joint 20 is any one selected from steel finger type, rail type, and monocell type. Method is applied. In addition, it is preferable that the pocket 13 is formed in the expansion joint precast 10 for insertion of the vertical shear connecting material 5 installed in the girder 3.

Then, the telescopic joint precast 10 according to the present invention is installed by connecting the reclamation plate 20 of the telescopic joint 20 to the basic rebar 11 so that the telescopic joint 20 is buried. 11) a plurality of first bolt members 30 in the lateral direction to enable connection with the steel beam 50 and the second bolt members 40 at the bottom edge so as to be adjustable in height are manufactured by being buried.

At this time, the first bolt member 30 is installed inside the expansion joint precast 10, as shown in Figure 3, the first binding nut 31 is formed with a first front key 32 on the outside, The first cap 33 welded to the upper portion of the first binding nut 31 and the first guide tube inserted into the upper surface of the first cap 33 and extending to the upper surface of the expansion joint precast 10 ( 35) and the lower end is coupled to the first binding nut (31), the other end is made of a tanned fixing bolt (37) protruding from the upper surface of the telescopic joint precast (10).

In addition, the second bolt member 40 is installed inside the bottom edge of the expansion joint precast 10, as shown in Figure 4, the second fastening key 42 is formed on the outside of the second binding nut (41) And, the second cap 43 is welded to the upper portion of the second binding nut 41, and the second guide is inserted into the upper surface of the second cap 43 and extended to the upper surface of the expansion joint precast 10 It consists of a leveling retaining bolt 47 that is coupled to the pipe 45 and the second binding nut 41 and protrudes to the bottom surface of the telescopic joint precast 10 when descending.

And, the step plate 22 of the expansion joint 20 is formed on the upper surface of each buried plate 21, and the expansion joint plate 23 of the expansion joint 20 is installed on the upper surface of each step plate 22. . At this time, the step plate 22 may not be installed according to the installation standard.

Thereafter, a waterproof sheet 24 of the expansion joint 20 is installed between them, and concrete is poured up to the height of each expansion joint plate 23 to cure, but the first guide tube of the first bolt member 40 (37) The upper surface and the upper surface of the second guide tube 47 of the second bolt member 40 are formed to have the same height as the concrete, respectively, so that they are exposed to the outside. At this time, it is preferable to form a grooming (not shown) in the longitudinal or transverse direction in order to reduce noise and prevent vehicle braking pushing on the upper surface of the expansion joint precast 10.

In addition, the steel beam 50 according to the present invention has a cross-sectional shape of "H" or "I" is formed, at least one is installed in the longitudinal direction from the upper surface of the pair of expansion joint precast 10, the One bolt member 30 is coupled to the tanning fixing bolt 37 by a pair of nuts 51. At this time, the reason for installing the pair of nuts 51 is to stably elevate the telescopic joint precast 10.

In addition, the steel beam 50 is a transverse steel beam formed with a cross-sectional shape of "H" or "I" on the upper surface to prevent bending when the load of the telescopic joint precast 10 is relatively heavy or relatively long. (Not shown) may be further bolted.

On the other hand, the expansion joint precast 10 according to the present invention, as shown in Figure 6 by installing the first pocket (1a) with an open front at any end of any one of the pre-installed bottom plate (1) at equal intervals The first unevenness (1b) is formed, the first loop reinforcing bar (1c) is formed horizontally protruding from one side of the inner side of each first pocket (1a), corresponding to the first pocket (1a) at the other end The second pocket 1d is formed at equal intervals by installing the second pocket 1d, the front of which is open at the location, and the second loop reinforcing bar 1f is formed on one side of the inner surface of each second pocket 1d. When the horizontally protruding so as to intersect with the first loop reinforcing bar 1c, the third pocket 12 with the front surface open at a position corresponding to the first pocket 1a at the end of the expansion joint precast at either side at equal intervals By installing to form the third unevenness 13, the third loop reinforcing bar 14 is horizontally protruded so as to cross with the first loop reinforcing bar 1c at one side of the inner side of each third pocket 12, The fourth uneven 16 is formed at equal intervals by installing the fourth pocket 15 with the front surface open at a position corresponding to the second pocket 1d at the other end of the expansion joint precast. On one side of the inner surface of the pocket 15, the fourth loop reinforcement 17 is formed to protrude horizontally to intersect with the second loop reinforcement 1f, and between the first and third irregularities 1b and 13, the second and fourth Between the unevenness (1e, 16), in the first and third pockets (1a, 12), and in the second and fourth pockets (1d, 15), respectively, a non-shrinking mortar is placed and integrated.

Hereinafter, with reference to the accompanying drawings, the gravity leveling method of the telescopic joint precast member according to the present invention will be described in detail as follows.

7 is a process diagram for explaining the gravity leveling method of the stretchable joint precast member according to the present invention, and FIGS. 8A to 8H are cross-sectional views for explaining the gravity leveling method of the stretchable joint precast member according to the present invention.

7 to 8h, the gravity leveling method of the expansion joint precast member according to the present invention includes a space forming process (S10), a shear connecting material installation process (S20), and a stretching joint precast manufacturing process (S30). And a seating process (S40), a leveling process (S50), a leveling maintenance process (S60), a removal process (S70), and a non-shrinking mortar pouring process (S80).

《Spatial formation process-S10》

First, as shown in FIG. 8A, a space is formed so that the upper part of the girder 3 of the bridge is exposed between the pre-installed floor plates 1 to enable the installation of the expansion joint precast 10. Here, in the case of replacement construction, a part of the pre-installed base plate 1 is vertically cut, but a space is formed by cutting up to the upper surface of the girder 3, and in the case of a new construction, each corresponding to the expansion joint precast 10 The ends of the vertically formed, spaced apart from each other to form a space.

<< Shear connector installation process-S20 >>

And, as shown in Figure 8b, the vertical shear connecting material 5 is installed on the top of the girder (3). At this time, the vertical shear connecting material 5 is welded vertically as shown in the drawing when the girder 3 is steel, and when the girder 3 is concrete, the lower end is vertically embedded in the form of an anchor.

《New joint precast production process-S30》

As shown in FIG. 8c, as described above, a pair of telescopic joint precasts 10 are manufactured, and a steel beam 50 is fixed to the pair of telescopic joint precasts 10 with a fixing nut 51. Install and fix it integrally.

<< seating process-S40 >>

Then, as shown in Figure 8d, after lifting the steel joint beam 50 is installed telescopic joint precast (10) to the installation site, the steel beam (40) lifting equipment (CR) to the tanned fixing bolt 37 is coupled (CR ) And then lifting and inserting the elastic joint precast between the previously installed floor plates (1) to be placed on the upper surface of the girder (3), respectively, both ends of the steel beam (50) on the upper surface of the previously installed floor plate (1). Mount it. At this time, since the height of the expansion joint precast 10 is formed smaller than the height of the installed base plate 1, the expansion joint precast 10 has a predetermined distance (d, for example, from the upper surface of the girder 3) , 10~20㎜), it keeps floating. In addition, by using the steel beam 50, it can be lifted from a manufacturing plant and carried on the transport equipment. In addition, when seated on the girder 3, the vertical shear connecting material 5 is inserted into the pocket 13 of the expansion joint precast 10.

<< leveling process-S50 >>

Then, while installing a horizontal system (not shown) on the telescopic joint precast 10, while rotating the fixing nut 51 as shown in FIG. 8E, while lowering the telescopic joint precast 10, the installed base plate Match the level of the lesson. At this time, if the expansion joint precast 10 is too lowered, the level is adjusted again by lifting again.

<< leveling maintenance process-S60 >>

When the level of the telescopic joint precast 10 is aligned, the tool is inserted into the second bolt member 40 of the telescopic joint precast 10 as shown in Fig. 8F, and then the leveling retaining bolt 47 is rotated down. Let the girder (3) interview with the top surface to maintain leveling.

<< removal process -S70 >>

When the leveling is maintained by the expansion joint precast 10 by the leveling retaining bolt 47, the tanning fixing bolt 37 of the steel beam 50 and the first bolt member 30 is stretched as shown in FIG. 8G. It is removed from the joint precast 10.

<< shrinking mortar pouring process-S80 >>

Finally, as shown in FIG. 8h, between the pocket 13 of the telescopic joint precast 10, the telescopic joint precast base plate 10 and the pre-installed floor plate 1, the telescopic joint precast 10 The installation is completed by placing a non-shrinking mortar (M) between the bottom surface and the top surface of the girder (3) and inside the first and second bolt members (30. 40), respectively.

The present invention can be variously modified and can take various forms, and the detailed description of the invention has been described only for the specific embodiments accordingly. However, it should be understood that the present invention is not limited to the specific forms mentioned in the detailed description, but rather includes all modifications, equivalents, and substitutes within the spirit and scope of the present invention as defined by the appended claims. Should be.

1: bottom plate 3: girder
5: vertical shear connecting material 10: stretch joint precast
20: expansion joint 30: 1st bolt member
40: second bolt member 50: steel beam

Claims (7)

A space forming process of forming a space such that the upper part of the girder of the bridge is exposed between the pre-installed floor plates to enable the installation of the expansion joint;
A shear connection material installation process for installing a vertical shear connection material on the upper side of the girder;
The expansion joint is integrally formed to have a pocket on a corresponding portion so that the vertical shear connection material is inserted, a plurality of first bolt members are vertically projected on the upper surface, and a second bolt member is installed and installed at each corner of the bottom surface. A stretch joint precast fabrication process of prefabricating a joint precast and coupling a steel beam to a first bolt member of the stretch joint precast;
After transporting the telescopic joint precast to the installation site, the lifting equipment is bound to the steel beam and then lifted to insert the telescopic joint precast between the pre-installed floor plates and placed on the upper surface of the girder, but at both ends of the steel beam. And seating process for mounting each on the upper surface of the previously installed bottom plate;
A leveling process of rotating the fixing nut to lower the stretch joint precast to match the level with the previously installed bottom plate;
A leveling maintenance step of lowering the second bolt member of the telescopic joint precast to maintain leveling by making an interview with the upper surface of the girder;
A removing step of removing the steel beam and the first bolt member from the expansion joint precast; And
Non-constriction mortar is poured into the stretched joint precast and the installed base plate, between the bottom surface and the girder upper surface of the stretched joint precast, and in the portion where the first bolt member is removed and the portion where the second bolt member is formed, respectively. Gravity leveling method of stretch joint precast member, characterized in that it consists of a shrink mortar pouring process. According to claim 1,
The expansion joint,
Gravity leveling method of a telescopic joint precast member, characterized in that any one of a strong finger type, a rail type, and a monocell type is applied. According to claim 1,
The expansion joint precast,
Gravity leveling method of the expansion joint precast member, characterized in that the height is formed smaller than the height of the installed base plate. According to claim 1,
The steel beam,
The cross-sectional shape is formed of "H" or "I", the gravity leveling method of the expansion joint precast member, characterized in that a plurality of longitudinally installed in a pair of the expansion joint precast. According to claim 1,
The steel beam,
When the load of the expansion joint precast base plate is relatively heavy or relatively long, it is characterized by additionally bolting a transverse steel beam having a cross-sectional shape of "H" or "I" on the upper surface to prevent bending. Gravity leveling method of telescopic joint precast member. According to claim 1,
The first bolt member,
A first binding nut installed inside the expansion joint precast and having a first shear key formed outside;
A first cap welded to the upper portion of the first binding nut;
A first guide tube inserted into an upper surface of the first cap and extending to an upper surface of the telescopic joint precast; And
Gravity leveling method of the expansion joint precast member, characterized in that the lower end is coupled to the first binding nut, the other end is made of a tanned fixing bolt protruding from the upper surface of the expansion joint precast. According to claim 1,
The second bolt member,
A second binding nut which is installed inside the bottom edge of the telescopic joint precast and has a second shear key formed on the outside;
A second cap welded to the upper portion of the second binding nut;
A second guide tube inserted into an upper surface of the second cap and extending to an upper surface of the telescopic joint precast; And
Gravity leveling method of a telescopic joint precast member, characterized in that it consists of a leveling retaining bolt that is coupled to the second binding nut and protrudes to the bottom surface of the telescopic joint precast when lowered.

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