JP4875775B1 - Removal method of bridge deck - Google Patents

Abstract

A steel girder and a concrete floor slab are trimmed while leaving a stud gibber intact so that the concrete floor slab can be removed.
SOLUTION: Only a concrete is removed from a top surface of a floor slab 2 along a length direction of a steel girder 1 by a high-pressure water jet to form a cutting zone having a width narrower than that of the steel girder 1, and the cutting zone is formed in the cutting zone. The girders on the upper surface of the steel girder 1 and a part of the reinforcing bar embedded in the concrete floor slab 2 are exposed, and the steel girder 1 and the concrete floor slab 2 are edge-cut, and the edge-cut concrete floor slab 2 has the required size. Cut into block pieces, peel upward and remove.
[Selection] Figure 1

Description

  The present invention relates to a concrete floor slab installed on a main steel girder constituting a road bridge or the like, that is, a method for removing a bridge floor slab.

  Generally, this type of bridge deck is required to be replaced due to aging. When replacing bridge decks, we want to remove only the old decks, leaving the main girders, but concrete decks are usually made up of many stud gibbles or rebars formed on the upper surface of steel main girders. When the concrete floor slab is disassembled or removed, the rigid connection warps and makes it difficult to disassemble or remove. At present, a plurality of methods are known as concrete floor slab removal methods.

  As a first related art, a floor in a composite girder in which a concrete floor slab is installed on a steel main girder and the floor slabs are coupled by a plurality of dowels provided on the upper surface of the main girder. It is a plate removal method, and the floor slab supported by the main girder is cut in the bridge axis direction along one side of the pair of main girder, and further, this floor slab is cut in the bridge width direction, A plurality of rectangular floor slab blocks are used, and holes are drilled using a concrete core drilling machine at the positions where the divels are arranged laterally from the cut surfaces on both sides of the floor slab blocks connected to the main girder by the dowels. This is a floor slab removal method characterized in that the floor slab block and the main girder are released from the coupled state by the gibber, and the floor slab is removed from the main girder (Japanese Patent Laid-Open No. 9-158124).

  According to this removal method, the floor slab is cut in the vicinity of the position where the gibber is erected on the girder, and the diver is cut off by forming a hole at the position where the diver is placed sideways from the cut surface. Then, the coupling of the floor slab with the gibber is released and the girder and the floor slab are separated, so that noise and vibration are generated compared to the conventional method of crushing and removing the floor slab with a large force. It is possible to remove a damaged and aged floor slab without letting it sprinkle or disperse debris or dust.

  Further, as a second related art that is publicly known, in a bridge in which a reinforced concrete floor slab is installed on a flange of a steel main girder, the reinforced concrete floor slab is cut into a large number of blocks that can be carried out, and the reinforced concrete A large number of holes are formed in the floor slab directly above the flange, and then the static crushing agent is mixed with water and injected into the holes. A method for dismantling a reinforced concrete floor slab of a bridge, characterized in that the reinforced concrete floor slab and the steel main girder are separated by crushing, and then the block of the reinforced concrete floor slab is removed (Japanese Patent Laid-Open No. 2003-247212). Publication).

  According to this dismantling method, a static crushing agent is injected directly above and near the steel main girder flange of the reinforced concrete floor slab to crush the concrete to separate the reinforced concrete floor slab from the steel main girder, and then to the reinforced concrete floor slab. By removing the slab, it is possible to remove the joint including the reinforced concrete floor slab and the steel main girder flange, so that efficient dismantling work can be performed.

  Furthermore, although it is not a method of removing the floor slab, it is known that the part to be repaired is repaired using a water jet device as a method of repairing the lower surface of the end of the concrete floor slab. The repair method is to insert a high-pressure water spray nozzle of a water jet device through a horizontal gap formed between a floor slab support seat surface of an abutment and a bottom surface of an end portion of a concrete slab supported by the support seat surface, The concrete that forms a chisel zone in which the concrete surface layer portion of the lower surface of the end portion of the concrete floor slab is formed over a required zone by high pressure water jetting by a high pressure water jet nozzle, and a buried reinforcing bar is exposed in the concrete surface layer portion. A template having bending elasticity is inserted through the lateral play between the vertical play formed between the end face of the floor slab and the rising surface of the inner end of the floor support support surface of the abutment. A mold frame is installed on the floor slab support seating surface to cover the lower open surface of the chisel band, and the front end surface of the mold frame is The mold plate is removed after the repair cement mortar is cured, the repair cement mortar is filled in the chip zone defined by the mold plate and the mold, which is in contact with the surface of the mold plate. This is a repair method of the bottom surface of the end portion of the concrete floor slab including the remaining (Japanese Unexamined Patent Publication No. 2006-161314).

  According to the method for repairing the bottom surface of the concrete floor slab, the bottom surface of the concrete floor slab supported on the abutment or the pier by the water jet device is appropriately sliced and buried in the required depth and width. The chipping work prior to the filling of the repair cement mortar can be performed soundly. Also, the mold plate inserted into the vertical gap and the mold installed on the floor support seat can cooperate to secure a space for filling the repair cement mortar. It is possible to ensure a repair effect by filling evenly without generating.

JP-A-9-158124 Japanese Patent Laid-Open No. 2003-247212 JP 2006-161314 A

  In the first prior art, the floor slab is cut into a block shape in the vicinity of the position where the jib is erected on the main girder, and a hole is formed at the position where the jib is located laterally from the cut surface. As a result, the gibber that is installed on the main girder is cut, the coupling with the floor slab is released, the main girder and the floor slab are separated, and the floor slab is removed. In order to form a new floor slab, it is necessary to integrally attach a new binding material such as a stud gibber on the main girder, which not only deteriorates workability but also uses a new gibber. There is a problem that material waste occurs.

  In the second prior art, a static crushing agent is injected directly into and near the steel main girder flange portion of the reinforced concrete floor slab to crush the concrete to separate the reinforced concrete floor slab from the steel main girder, After that, by removing the reinforced concrete slab, it is possible to remove the reinforced concrete floor slab and the steel main girder flange, but there are many rebars in the concrete slab. The upper surface of the steel main girder is provided with a large number of stud gibbels and is connected with a strong binding force, so that the expansion pressure generated when the static crushing agent reacts with water is the weakest of the closing or sealing strength. Since the opening end side of the injection hole is the weakest, the expansion pressure escapes indefinitely from the opening end side. Over preparative was observed established less is crushed, Briefly it is estimated to be difficult to peel the reinforced concrete slab of steel main beam.

  And, it is recognized that a large number of holes are formed in a staggered pattern directly above the steel main girder flange of the reinforced concrete slab, and the opening side of these numerous holes is weakened by some crushing due to expansion pressure. Even if it is strongly pulled up with a crane etc. for each cut block, the joint part with the stud gibber strongly resists, but if you try to pull it off forcibly, not only a large crane is necessary, Although it is possible to crush the concrete at the joint with a large crane and tear it away, many of the crushed concrete debris will fall and adversely affect the environment, especially on rivers, preventing concrete debris from falling For this purpose, it is necessary to provide the necessary facilities for the scaffolding. Dojiberu damage or or a portion of the concrete is of being may remain between the stud dowels, including recovery operations such as falling concrete debris subsequent treatments has a problem that it is extremely troublesome.

  Furthermore, in the third prior art, the problem is to repair the lower surface of the concrete floor slab end, and for that purpose, a water jet device is used and formed between the floor slab support seat surface of the abutment. A high-pressure water injection nozzle is inserted through the horizontal gap, and the concrete surface layer on the lower surface of the end of the concrete slab is crushed over a required band by high-pressure water injection by the high-pressure water injection nozzle, and the reinforcing bar embedded in the concrete This is a concrete floor where a chisel zone is formed, and the chisel zone is surrounded by a mold that covers the elastic mold plate and the lower open surface, and is filled with repair cement mortar. No mention is made of a coupling gibber for coupling between the plate and the floor support surface of the abutment.

  Then, this 3rd prior art is not suggested until it can be applied to the removal of the concrete slab in the general bridge or viaduct in which the main girder and the concrete slab are connected with the dowel. And even if it is applied, how to do it specifically must be developed as such.

  Therefore, in the prior art, the concrete floor slab can be removed by cutting the edge of the steel girder and the concrete floor slab while leaving the stud gibber intact without adversely affecting the environment. There is a problem to be solved.

In the present invention, as concrete means for solving the problems of the above-described conventional example, a slab concrete slab is installed on a steel main girder constituting a road bridge or the like, and the steel main girder (steel girder). the coupled by a plurality of coupling members provided in the upper surface the concrete slab a removing method, the binder and dowels, high pressure water along the length of the steel girder from the upper surface of the slab By removing only the concrete with a jet to form a cutting zone with a width narrower than the width of the steel girder, the girders on the upper surface of the steel girder and a part of the reinforcing bar embedded in the concrete deck are exposed in the cutting zone. And a concrete floor slab, and the concrete floor slab that has been cut is cut in the vicinity of the middle where no steel girder is present to make a block piece of a required size and then removed and removed. Floor slab It is to provide a removing method.

In the present invention, the binder is a reinforcing bar ; the block piece is cut by cutting the concrete floor slab in the bridge width direction and in the vicinity of the middle where the steel girders are not present ; In addition, when the width B of the steel girder upper surface, the width a of the cutting zone to be formed, and the remaining allowance c are B = a + 2c, a <B and c is at least 5 cm. It is included as a requirement.

  According to the method for removing a bridge floor slab according to the present invention, only the concrete is removed by a high-pressure water jet to form a cutting zone having a width narrower than the width of the steel girder. Work efficiency is achieved because the steel bar and floor slab are cut off by exposing the reinforcing bars, and the concrete slab is cut and removed into block pieces of the required size, leaving the gibber on the upper surface of the steel girder as it is. As well as being good, since concrete fragments do not scatter, there is an excellent effect of not adversely affecting the environment.

It is the perspective view which showed schematically the removal method of the bridge floor slab which concerns on the 1st Embodiment of this invention. It is a schematic sectional drawing of the principal part which shows the condition which cuts and removes a concrete floor slab with a high pressure water jet in the removal method of the bridge floor slab which concerns on the embodiment. It is a schematic plan view of the principal part which shows the condition where the concrete floor slab is cut and removed with a high-pressure water jet in the bridge floor slab removal method according to the embodiment. It is a schematic side view of the principal part showing a situation in which the concrete floor slab is cut and removed with a high-pressure water jet in the bridge floor slab removal method according to the embodiment. FIG. 4 is a schematic side view of a main part showing a cutting zone formed by cutting and removing only concrete of a concrete floor slab with a high-pressure water jet in the method for removing a bridge floor slab according to the same embodiment. It is explanatory drawing which shows schematically the condition which cuts and removes a bridge floor slab into a block in the embodiment. It is the perspective view which showed schematically the removal method of the bridge floor slab which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows schematically the condition which cuts and removes a bridge floor slab into a block in the embodiment. It is the perspective view which showed schematically the removal method of the bridge floor slab which concerns on the 3rd Embodiment of this invention. FIG. 4 is a schematic side view of a main part showing a cutting zone formed by cutting and removing only concrete of a concrete floor slab with a high-pressure water jet in the method for removing a bridge floor slab according to the same embodiment. It is explanatory drawing which shows schematically the condition which cuts and removes a bridge floor slab into a block in the embodiment.

  The present invention will be described in detail based on the illustrated embodiment. First, FIGS. 1 to 6 show a method for removing a bridge deck according to the first embodiment of the present invention. Generally, a bridge such as a road bridge or a viaduct is generally made of a plurality of steel. A slab concrete slab (hereinafter referred to as a concrete slab) 2 is installed on a girder (hereinafter referred to as a steel girder) 1, and the concrete slab 2 is generally struck in the field. Are firmly coupled to the steel girder 1 by a stud gibber 3 which is a plurality of coupling materials provided on the upper surface of the steel beam.

  When the concrete floor slab 2 of the bridge configured as described above is replaced due to aging or the like, it is necessary to dismantle and remove the aging concrete floor slab 2 while leaving the steel girder 1. Therefore, the present invention uses a high-pressure water jet device (not shown) to cut and remove only the concrete of the concrete slab 2 along the lengthwise upper surface of the steel girder 1 over the required width and length, The steel girder 1 and the concrete floor slab 2 are trimmed by forming a cutting zone 5 in which the gibber 3 and a part of the reinforcing bar 4 embedded in the concrete floor slab 2 are exposed. Thereafter, the concrete floor slab 2 is cut into a block of a required size with an appropriate concrete cutter or the like within the length range of the formed cutting zone 5, and the block is peeled upward by an appropriate means and removed. As the peeling means, for example, it is lifted and removed by a crane or the like.

  In this case, as shown in FIGS. 2 to 4, in order to form a cutting zone 5 having a required width along the length direction of the steel beam 1 from the upper surface of the concrete slab 2 with the nozzle 6 of the high-pressure water jet, High pressure water 7 is sprayed to cut and remove only the concrete, and the gibber 3 provided on the steel girder 1 and a part of the reinforcing bar 4 disposed in the concrete floor slab 2 are exposed in the cutting zone 5 to form a steel girder. 1 and the concrete slab 2 are separated from each other. However, dirty water containing impurities such as concrete particles that have been cut by the high-pressure water 7 may cause trouble to the surroundings or adversely affect the surrounding environment. It is collected without running down.

  As the recovery means, a water stop plate 8 made of an iron plate or the like is attached to the end of the concrete slab 2 where the cutting zone 5 is to be formed. For example, rubber rubber is attached to the contact surface side of the water stop plate 8, and an L-shaped angle member 9 is provided at the lower end portion on the opposite surface side. Temporary fixing between the upper surface of the steel beam 1, for example, spot welding, bolts or adhesive fixing, or clamping between the flange part 1 a with an appropriate clamping tool, or temporarily fixing the angle member 9 It may be formed by a magnet and fixed by suction, and an appropriate means is used for the temporary fixing.

  A drainage hose or pipe 11 with a pump 10 is connected to the water stop plate 8, and the hose or pipe is connected to a wastewater treatment device (not shown) brought into the construction site to drive the pump. However, the water contaminated by cutting and removing the cutting zone 5 with the high-pressure water 7 is sequentially collected by the wastewater treatment device via the hose or pipe 11.

  Since the collected dirty water contains alkaline concrete particles and debris, the wastewater treatment apparatus purifies the water by performing purification treatment, that is, neutralization treatment and filtration treatment, or waste water, or The purified water can be stored in a required water tank and used again as high-pressure water for a high-pressure water jet.

  Further, as shown in FIGS. 5 and 6, the required width a of the cutting zone 5 formed in the concrete floor slab 2 is smaller than the upper surface width B of the steel girder 1 (a <B), The concrete floor slab 2 after the formation of the cutting zone 5 is required to leave a minimum residual allowance c on both sides in order to maintain the mounting state with respect to the steel girder 1. And B = a + 2c, and the above-mentioned residual allowance c must be at least about 5 cm.

  And the concrete floor slab 2 is cut | disconnected and cut | disconnected in the block shape of required magnitude | size with an appropriate concrete cutter etc. along the cutting lines 12a and 12b shown in FIG. Although this block-like cutting differs depending on the width of the concrete slab 2 in the bridge width direction, for example, it is cut along the cutting line 12a in the vicinity of the middle where the steel girder 1 does not exist, and the bridge width direction is tracked. The concrete floor slab 2 is cut at a cutting line 12b in the bridge width direction so as to have a size that can be carried out by, for example, a rectangular concrete block piece as a whole. For removing the concrete block piece, the concrete block piece can be easily removed from the steel girder 1 by holding the suspension wire 13 on the reinforcing bars 4 exposed at the two cutting zones 5 and lifting it with a crane or the like. It can be peeled off and lifted up almost horizontally to be removed, which is convenient when loading on a transport truck.

  Next, the second embodiment shown in FIGS. 7 to 8 will be described. Note that the same parts as those in the first embodiment are described in duplicate, so the same reference numerals are given and the details are omitted. In this second embodiment, the concrete floor slab 2 is cut and removed only by the high-pressure water jet along the upper surface in the length direction of each steel girder 1 so as to form a cutting zone 5 having a required width. The process is such that the steel bar 1 and the concrete slab 2 are separated from each other by exposing the steel bar 4 and the steel bar 4 and the cut and dirty water is collected and purified in the waste water treatment apparatus.

  And then, in the step of cutting the concrete floor slab 2 into blocks, the cutting position is simply changed to make the block pieces different in size. That is, the cutting zone 5 formed in the steel girder 1 on both sides in the concrete floor slab 2 is left as it is, and the reinforcing bar 4 exposed in the cutting zone 5 formed in each steel girder 1 located in the middle is cut at the center. As a result, a concrete block piece is removed for each steel girder 1, that is, for each section. In this case, as the cutting means used, for example, a manual small and light gas cutting machine or the like can be used.

  In short, the concrete block pieces to be removed must be sized and weighted so as not to hinder removal and transportation when they are made into block pieces depending on the width and thickness of the concrete floor slab 2. After forming the cutting zone 5 that cuts off the connection between the plate 2 and the steel girder 1, the position of cutting into a block shape is restricted by the situation at the site. Furthermore, when removing the block pieces for each section, if there is a risk of the steel girder 1 being twisted due to the weight of the block pieces still remaining on one side of the steel girder 1, support work is performed near both sides of the steel girder 1 It is necessary to take measures to support the concrete floor slab 2 in a stable state until the support piece 14 is provided and the block piece is removed.

  In any of the above-described methods for removing a bridge floor slab, the floor slab 2 can be efficiently removed with the gibber 3 remaining on the steel girder 1, and the remaining gibber 3 is newly installed as it is. Since it can be used as a binding material to the concrete floor slab, the cost and labor can be significantly reduced.

  Furthermore, the third embodiment shown in FIGS. 9 to 11 will be described. This third embodiment is different from the first and second embodiments in that the bonding material provided on the steel beam 1 is a reinforcing bar (bonding bar 15) instead of a stud gibber. Since the constituent parts are substantially the same, the description of the same parts will be repeated, and the same reference numerals will be given, and the details thereof will be omitted.

  Also in this third embodiment, the concrete floor slab 2 is cut along the upper surface in the length direction of each steel girder 1 with a high-pressure water jet to cut and remove only the concrete to form a cutting zone 5 having a required width, and the reinforcing bar 4. And the first and second steps up to the step of separating the connection between the steel girder 1 and the concrete slab 2 by exposing the connecting bar 15 and the step of recovering the cut and dirty water and purifying it in the waste water treatment device. This is the same as the embodiment.

  The connecting bar 15 provided on the steel girder 1 is formed in an inverted trapezoidal shape unlike an upright stud gibber, the top of the inverted trapezoidal shape is welded onto the steel girder 1 and the left and right legs are extended upward, Since its tip extends in the lateral direction and is longer than the width of the steel beam 1, it protrudes from the cutting zone 5 formed in the width a narrower than the width B of the steel beam 1 and fits in the concrete slab 2. The steel girder 1 and the concrete floor slab 2 are cut at most parts by forming the cutting zone 5, but are not completely cut off because a part of the connecting bars 15 are still connected. (See FIG. 10).

  Therefore, in the cutting zone 5, for example, when a portion where the exposed connecting bar 15 is connected is cut with a gas cutter, if the reinforcing bar 4 exposed in the cutting zone 5 does not get in the way, the connecting bar 15 is Cut the edges. Otherwise, after forming the cutting zone 5, when cutting into concrete block pieces, first cut the width direction as the block pieces along the cutting line 12b with a concrete cutter or the like, then, for example, manually When the reinforcing bar 4 and the connecting bar 15 exposed in the cutting zone 5 are cut (fused) along both side surfaces of the cutting zone 5 using a small and light gas cutting machine or the like, a part of the connecting bar 15 becomes a steel girder. The block piece remains on 1 and is completely trimmed.

  By cutting the edge in this way, as in the case of the second embodiment, it is divided into block pieces and removed every section, and at the time of removal, the weight of the block piece still remaining on one side is removed. If the steel girder 1 is likely to be twisted, a support member 14 such as a support is provided in the same manner as described above, and measures are taken to support the concrete slab 2 in a stable state until the block piece is removed. Then, when lifting and removing, for example, the insert 16 is driven into the block piece and used as a hanging hardware, and an appropriate locking jig is inserted to connect the wire 13 and lift and remove.

Each configuration in the embodiment described above can be variously changed without departing from the gist of the present invention, and is not limited to each configuration in the embodiment.
For example, along the width a of the cutting zone, the concrete floor slab 2 is first cut with a concrete cutter or the like to a required depth (near the middle of the thickness or reaches the upper surface of the steel girder 1), and then cut. The concrete of the floor slab 2 in the width a of the cutting zone may be removed with the high-pressure water 7. In short, in consideration of work efficiency, performing the step of cutting the width a of the cutting zone with a concrete cutter first and the step of removing the concrete with high-pressure water along the width of cutting after that is the present invention. The same effect can be obtained along the gist of the present invention, and it falls within the scope of the invention.

  In any of the embodiments according to the present invention, the bridge floor slab removal method also forms a cutting zone having a width narrower than the width of the steel girder by removing only the concrete with a high-pressure water jet, and the diver and the floor slab are formed in the cutting zone. Because the steel bars and floor slabs are cut off by exposing the reinforcing bars arranged inside, and the concrete floor slab is cut into block pieces of the required size while leaving the gibber on the upper surface of the steel girder as it is. This type of bridge floor slab is not only bad for the environment, but also because the work efficiency is good and the concrete debris does not scatter. Widely available for removal technology.

DESCRIPTION OF SYMBOLS 1 Steel girder 1a Flange part 2 Concrete floor slab 3 Stud diver 4 Reinforcing bar 5 Cutting zone 6 Nozzle 7 High pressure water 8 Water stop plate 9 Leg elbow 10 Pump 11 Hose or pipe 12a, 12b Cutting line 13 Wire 14 Support material 15 Bonding bar 16 Insert a Width of cutting zone B Width of steel girder upper surface c Residual hooking allowance

Claims (4)

A concrete slab in which a reinforced concrete floor slab is installed on a steel main girder constituting a road bridge, etc., and is joined by a plurality of binders provided on the upper surface of the steel main girder (steel girder) Is a method of removing
The binder is a gibber, and only the concrete is removed by a high-pressure water jet along the length direction of the steel girder from the upper surface of the floor slab to form a cutting zone having a width narrower than the width of the steel girder,
Exposing the gibber on the upper surface of the steel girder and a part of the reinforcing bar embedded in the concrete floor slab in the cutting zone to perform edge cutting between the steel girder and the concrete floor slab,
A method for removing a bridge floor slab, characterized in that the edged concrete floor slab is cut near the middle where there is no steel girder to make a block piece of a required size and then peeled upward. The method for removing a bridge deck according to claim 1, wherein the binding material is a reinforcing bar. The block piece is cut by cutting the concrete floor slab in the bridge width direction and near the middle where the steel girder does not exist.
The method for removing a bridge deck according to claim 1 or 2, wherein: In the formation of the cutting zone, when the width B of the steel girder upper surface, the width a of the cutting zone to be formed, and the remaining allowance c are B = a + 2c, a <B, c is at least 5 cm. The method for removing a bridge deck according to any one of claims 1 to 3.

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