KR100837608B1 - J.K Bracket Method - Google Patents

Abstract

The present invention is a bridge slab raising method for raising the upper portion of the bridge, such as the upper plate installed on the bridge. The pulling method comprises the steps of: forming a block out to expose the inner reinforcing bar on the coping upper surface of the piers (S1); Installing at least two hollow iron pipes having a plurality of nuts penetrated to the block-out surface such that the nuts face upwards (S2); Restoring the coping surface by pouring super-speed non-contraction mortar on the block-out surface (S3); Inserting a high tension steel bar having a plurality of bolt fixing grooves into the hollow steel pipe such that the bolt fixing groove and the nut coincide (S4); Inserting a fixing bolt from an upper portion of the restored coping surface so as to be in close contact with the bolt fixing groove while passing through the nut (S5); Installing a prefabricated steel bracket at an end portion of the high tensile steel bar, the portion of which protrudes into the sidewall of the piers (S6); Placing the jack support plate on the prefabricated steel bracket and applying silica sand on the jack support plate to adjust the level of the jack support plate (S7); And installing a hydraulic jack on the jack support plate to raise the bridge slab (S8). At this time, in the step of installing the hollow iron pipe (S2) to constrain the hollow iron pipe primarily by using an anchor, anchor bolt and fixing plate to wrap the hollow iron pipe in the upper, lower, left, right, again By joining the hollow steel pipe and the cast iron of the pier, the hollow steel pipe can be fixed twice.

Description

Bridge slab pulling method using high strength steel bar and prefabricated steel bracket which is formed integrally with hollow steel pipe embedded by inserting block out on the top of bridge coping {J.K Bracket Method}

1 is a side view of a bridge for explaining a conventional bridge upper lifting method,

Figure 2 is a construction sequence diagram for explaining the operation of the bridge in Figure 1,

3 is a side cross-sectional view of a bridge showing a state in which the pulling apparatus according to the present invention is installed,

4 is a partially enlarged view illustrating a state in which the hollow steel pipe and the high-tensile steel bar of FIG. 3 are buried to support the load;

FIG. 5 is an enlarged view of the hollow steel pipe and the high tensile steel bar of FIG. 4; FIG.

6 is a view showing a case in which to raise the slabs on both sides of the piers using the pulling apparatus according to the present invention,

7 is a front view of a bridge for showing a prefabricated steel bracket according to the present invention,

8 is an exploded view illustrating the bracket of FIG. 7, and

9 is a view showing a combination of the bracket of FIG.

<Description of the code | symbol about the principal part of drawing>

10 bridge 12 bridge

13: slab 14: the main reinforcing bar

15: prefabricated rebar of the concrete bracket 16: concrete bracket

30: hydraulic jack 31: silica sand

32: jack base plate 40: hollow steel pipe

41: nut 45: anchor

46: anchor bolt 47: fixed plate

50: high tensile steel bar 51: bolt fixing groove

55: fixing bolt 60: tightening nut

70: prefabricated steel bracket 71: vertical load support

72: vertical load dispersion support 73: seating groove

74: vertical load dispersion support rod 75: vertical load auxiliary support

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of raising an upper slab of a bridge, and more particularly, to an pulling method and apparatus for allowing an upper bridge slab to be raised using a jack.

In general, a bridge is composed of a girder and a girder that connects the bridge and the bridge or the alternating bridge and the top plate is integrated, commonly referred to as slab. These slabs are generally fixed to one side so that expansion, expansion, and sag may occur according to external factors after completion, and the other side of the slab is installed in connection with a pier bridge device in the form of a movable end.

Such bridges require repair work, reinforcement of slabs, or replacement of bridge devices due to various external factors over time after completion, or replacement of bridge devices to improve bridge performance. In this case, the work required to raise the bridge slab is necessary.

Bridge slabs are usually pulled up using hydraulic jacks, but require a clamping space for installing hydraulic jacks for pulling up. However, when the space is not enough, the side of the piers are crushed to assemble the reinforcing bars and new concrete is placed to make concrete brackets so that hydraulic jacks can be installed. In this regard, an example of a conventional slab pulling method will be briefly described with reference to FIGS. 1 and 2.

1 is a side view of a bridge for explaining a conventional bridge upper lifting method, and Figure 2 is a construction sequence diagram for explaining the operation of the bridge in FIG.

Referring to FIGS. 1 and 2, when the bridge device 11 is thin between the bridge 12 and the slab 13 and the mold space is insufficient, the hydraulic jack 30 may not be installed on the top surface of the bridge 12. In this case, the upper side of the pier 12 is crushed (step 1), the assembled reinforcing bars 15 of the concrete bracket (step 2), and then wrapped around the reinforcement to form a form (step 3), After pouring concrete (step 4), curing and demoulding the formwork, form a concrete bracket on the side of the bridge (12) (step 5) to install a hydraulic jack 30 on it (step 6), the slab 13 Impression (step 7).

The use of such an impression method is expensive to break the pier 12, cracks due to a large impact may occur, and unplanned areas may be broken. In addition, there is a safety problem because the adhesive strength between the new and old concrete during the bridge slab lifting work. In addition, it takes a lot of production time due to curing, there is a problem that can not be restored by removing the concrete bracket after the repair work.

The present invention has been made to solve the above problems, the object of the present invention is to secure the safe and large support force without damaging the pier, the lifting method to raise the slab and easy to disassemble easy to install To provide an iron bracket.

The present invention to achieve the above object,

Digging a coping upper surface of the pier so that internal reinforcing bars are exposed to form a block out (S1);

Installing at least two hollow iron pipes having a plurality of nuts penetrated to the block-out surface such that the nuts face upwards (S2);

Restoring the coping surface by pouring super-speed non-contraction mortar on the block-out surface (S3);

Inserting a high tension steel bar having a plurality of bolt fixing grooves formed on the outer circumferential surface into a hollow steel pipe such that the bolt fixing groove and the nut coincide with each other (S4);

Inserting a fixing bolt from an upper portion of the restored coping surface so as to be in close contact with the bolt fixing groove while passing through the nut (S5);

Installing a prefabricated steel bracket at an end portion of the high tensile steel bar, the portion of which protrudes into the sidewall of the piers (S6);

Placing the jack support plate on the prefabricated steel bracket and applying silica sand on the jack support plate to adjust the level of the jack support plate (S7); And

The step of raising the bridge slab by installing a hydraulic jack on the jack support plate (S8) provides a method of lifting the bridge slab comprising a.

At this time, in the step of installing the hollow iron pipe (S2) after the hollow iron pipe is disposed on the block-out surface, the anchors are installed on both sides of the hollow iron pipe, and after welding the cast iron of the anchor and the pier, The hollow steel pipe is first constrained by using anchor bolts and fixing plates to wrap the hollow steel pipes in the top, bottom, left and right. It can be fixed two times.

In addition, the present invention,

In the prefabricated steel bracket used in the bridge slab lifting method,

The prefabricated steel bracket is inserted into a vertical load support mounted on a high-tensile steel rod, a vertical load spreading support that is joined to the vertical load support at right angles, and a mounting groove formed on an upper surface of the vertical load spreading support. It provides a vertical load distribution support connecting the bridge, and the other end is coupled to the vertical load support, the other end is extended to the other end of the vertical load distribution support, and provided with a prefabricated steel bracket for raising the bridge slab, characterized in that it consists of a vertical load auxiliary support coupled to each other. .

Hereinafter, with reference to the accompanying drawings will be described for the slab pulling method and the pulling apparatus according to a preferred embodiment of the present invention.

Figure 3 is a side cross-sectional view of the bridge showing a state in which the pulling apparatus according to the present invention is installed, Figure 4 is a partially enlarged view showing a state in which the hollow steel pipe and the high-tensile steel rod of Figure 3 is going to support the load, and Figure 5 is an enlarged view of the hollow steel pipe and high tensile steel bar of FIG. 4.

3 to 5, as described in the related art, a bridge device 11 is installed between the pier 12 and the slab 13 so that the jack 30 is disposed between the top of the pier 12 and the slab 13. If there is no space to install the bracket (70) on the side of the pier 12 to be installed so that the jack 30 can be installed.

Bracket 70 is provided with a high-tensile steel bar 50 for supporting the bracket (70).

The high tensile steel bar 50 is embedded in the pier coping surface so as to protrude to the side of the pier coping surface, it is used to dig the coping surface of the pier (12) coping surface and concrete pouring with the reinforcing bars of the pier 12 to integrate.

That is, the pier 12 coping upper surface is excavated to expose the main reinforcing bar to form a block out.

The hollow iron pipe 40 is placed in the formed block out. At this time, a plurality of nuts 41 are integrally formed on the outer circumferential surface of the hollow steel pipe 40, and the nuts 41 are penetrated into the hollow steel pipe 40 and the hollow steel pipe 40. Is arranged so that the nut 41 faces upward. And the hollow steel pipe 40 is preferably provided with at least two or more to install a high-tensile steel bar 50 or prefabricated steel bracket 70 later.

Anchors 45 are formed by forming grooves in contact with the reinforcing bars of the piers 12 on both sides of the hollow iron pipe 40 arranged.

When the anchor 45 is provided, the part where the anchor 45 and the rebar abuts is welded and fixed.

The anchor bolt 46 is fastened to the fixed anchor 45 so as to pass to both sides of the hollow steel pipe 40. At this time, the fixing plate 470 is fitted together to the upper surface (the upper surface of the hollow iron pipe) of the anchor bolt 46 to restrain the hollow steel pipe 40.

The hollow iron pipe 40 is then welded to the part where the reinforcing bar abuts to fix the hollow iron pipe 40 twice.

The coping surface of the piers is restored by filling the blocked out surfaces with non-contraction supersized mortar. Since the nut 41 may be buried in the mortar in the restoration process, it is preferable to put a long tool in the nut 41 in advance so that the nut 41 is not buried in the mortar.

The high tensile steel bar 50 is inserted into the hollow steel pipe 40 embedded in this way. At this time, a plurality of concave bolt fixing grooves 51 are formed on the outer circumferential surface of the high tensile strength steel bar 50, and the bolt fixing grooves 51 are inserted to coincide with the nuts 41 of the hollow steel pipe 40. And high-strength steel bar 50 is to be inserted so that a part of the protruding to the coping surface outer wall of the pier 12, the protruding portion should be threaded.

In order to fix the inserted high tension steel bar 50, the fixing bolt 55 is fastened through a hole drilled toward the nut 41 from the upper portion of the block out. At this time, the fixing bolt 55 can be fastened to the bolt fixing groove 51 of the high tension steel bar 50 while passing through the nut 41 to firmly fix the high tension steel bar 50.

The fixing method of the high tension steel bar 50 described above is a method used to lift only one slab 13 placed in the pier 12 in such a way that only one wall of the pier 12 protrudes. However, when it is necessary to raise both slabs 13, the high tensile strength bar 50 may protrude on both wall sides of the pier 12.

6 is a view showing a case of raising the slabs on both sides of the piers using the pulling apparatus according to the present invention.

As shown in Figure 6 when the block out is formed long to extend to both sides of the piers, the hollow iron pipe 40 is installed on the lower surface of the block to restore the coping surface, high tension steel bar (50) It can be fixed by inserting long to protrude to both sides of the pier (12).

On the other hand, let's look at the detailed structure of the prefabricated steel bracket 70 is installed on the protruding high-tensile steel bar (50).

7 is a front view of a bridge for showing a prefabricated steel bracket, Figure 8 is an exploded view of the bracket of Figure 7, and Figure 9 is a view showing a combination of the bracket of FIG.

7 to 9, the prefabricated steel bracket 70 includes a vertical load support 71, a vertical load dispersion support 72, a vertical load dispersion support rod 74, and a vertical load auxiliary support 75. It is composed.

The vertical load support 71 has a long plate shape, and the upper portion of the vertical load support 71 is fitted to the threaded portion of the high tensile steel bar 50. After being inserted into the high tensile steel bar 50 as described above, the tightening nut 60 is fastened to the threaded portion of the high tensile steel bar 50 to fix the vertical load support 71 to the high tensile steel bar 50.

The vertical load distributing support 72 is coupled by bolting to protrude in a direction perpendicular to the vertical load supporting 71 at the upper side of the vertical load supporting 71. At this time, on the upper surface of the vertical load distribution support 72 is formed a plurality of seating grooves 73 concave.

The vertical load distributing support rod 74 is placed in the seating groove 73 formed in the vertical load distributing support 72 as a means for distributing the loads of the vertical load supporting members 71 fixed to the two high tensile steel bars 50. Both vertical load distribution support 72 is connected to each other.

And the vertical load auxiliary support 75 is to prevent the sag of the vertical load distribution support 72, one end is bolted to the lower side of the vertical load support 71 to extend diagonally in the diagonal direction, the other end is distributed vertical load It is bolted to the other end of the support (72).

The jack base plate 32 is mounted on the prefabricated steel bracket 70 installed in this way on the upper side of the vertical load distribution supporting rod 74, and the silica sand 31 is coated thereon. The silica sand can raise one slab or two slabs by installing a hydraulic jack 30 on the jack support plate 32 after horizontal adjustment as a means for horizontal adjustment of the jack support plate 32.

As can be seen from the above description, the slab pulling method and the apparatus according to the present invention can obtain a large bearing force because the high tensile steel rod is embedded in the upper surface of the pier to support the upper load of the bridge, and the supporting performance is determined by the number of high tensile steel bars It can be easily adjusted by adjusting the length of the landfill, and it is easy to install and dismantle the bracket, and in the case of repeating the same work in the future, it is possible to assemble high tensile steel rods in the hollow pipe through which many embedded nuts are attached. Therefore, a very economic effect can be expected.

Claims (3)

Digging a coping upper surface of the pier 12 to expose internal reinforcing bars to form a block out (S1); Installing at least two hollow iron pipes (40) having a plurality of nuts (41) attached to the block-out surface such that the nuts (41) face upwards (S2); Restoring a coping surface by pouring super-speed non-contraction mortar on the block-out surface (S3); Inserting a high tensile strength steel bar 50 having a plurality of bolt fixing grooves 51 on the outer circumferential surface into the hollow steel pipe 40 so that the bolt fixing grooves 51 and the nut 41 coincide (S4). ; Inserting a fixing bolt (55) from an upper portion of the restored coping surface so as to be in close contact with the bolt fixing groove (51) while passing through the nut (41); Installing a prefabricated steel bracket (70) at an end portion of the high tensile strength steel bar (50) protruding a part of the sidewall of the bridge (12) (S6); Placing a jack support plate (32) on the prefabricated steel bracket (70) and applying silica sand (31) on the jack support plate (32) to adjust the level of the jack support plate (32); And Raising the bridge slab 13 by installing a hydraulic jack 30 on the jack support plate 32 (S8); lifting method of the bridge slab comprising a. The method of claim 1, wherein in the step of installing the hollow iron pipe 40 (S2) after the hollow iron pipe 40 is disposed on the block-out surface, both sides of the hollow iron pipe 40 Install the anchor 45, weld the anchor 45 and the cast iron of the pier, and then raise the fixed plate 47 on the hollow steel pipe 40, and then the fixed plate 47 and the anchor 45 To the anchor bolt 46 to restrain the hollow steel pipe 40 primarily, and again weld the hollow steel pipe 40 and the cast iron of the pier to weld the hollow steel pipe 40. Impression method of a bridge slab characterized in that the secondary fixed. According to claim 1, The prefabricated steel bracket 70 is a vertical load support 71 which is mounted on the high tensile steel bar 50 and the vertical load distribution support that is coupled to the vertical load support 71 in a direction perpendicular to the 72, a vertical load dispersion support rod 74 inserted into a seating groove 73 formed on an upper surface of the vertical load dispersion support 72 and connecting the vertical load dispersion support 72, and the vertical load support One end coupled to (71), the other end is extended to the other end of the vertical load distributing support 72, the lifting method of the bridge slab, characterized in that composed of the vertical load auxiliary support 75 is coupled to each other.

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