JPH02311604A - Horizontal cutting method for bridge floor system - Google Patents

Abstract

PURPOSE:To accurately keep the cutting line by installing rails for guiding floating pulleys engaging with a sawing wire on both sides of a bridge girder, so that the floor system and the bridge girder can be cut off while moving the floating pulleys. CONSTITUTION:On both sides of a bridge girder 2 which is intended to be separated from the floor system 1, guide rails 9 for moving floating pulleys 10 engaging with an endless sawing wire 4 along the bridge girder 2 are installed. And the sawing wire 4 is driven by a driving device which has been movably installed at another place, and also while moving the floating pulleys 10 along the guide rails 9, the floor system 1 is cut off from the bridge girder 2. Thus, the reconstruction of the bridge girder can be efficiently carried out with a low environmental disruption.

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention provides a method for removing bridge slabs that require renovation due to aging, etc., with low pollution and economic efficiency. This article concerns methods for horizontally cutting bridge decks.

(Conventional technology) Bridge deck slabs installed on elevated roads, etc. become obsolete or damaged over time and need to be renovated. It will be necessary to remove the concrete floor slab.

The usual method of removal is to use a concrete cutter to cut the concrete slab vertically along both sides of the bridge girder, as shown in Figure 9. The concrete blocks are cut vertically in the width direction as well, and the cut concrete blocks are lifted and removed using a large crane or the like as shown in FIG. After the concrete blocks are removed, the remaining concrete on the bridge girder is removed (a) as shown in Figure 11.
) Crushing using a manual breaker or (b) large hydraulic breaker, or (C) crushing using a hydraulic crusher. Thereafter, as shown in FIG. 12, the floor slab fixing anchors are cut using a gas cutter or the like, and the crushed floor slab debris is collected using a belt conveyor or the like.

(Problems to be Solved by the Invention) However, such a removal method causes various problems.

First, cutting the concrete slab in the bridge width direction naturally requires cutting both sides of the bridge girder in the vertical direction, and the cutting itself takes a considerable amount of time. Furthermore, since the remaining concrete on the bridge girders is crushed by breakers, noise, vibration, and dust pollution are significant, making it not only unsuitable for work in urban areas, but also causing damage to the bridge girders. Moreover, even after the concrete slab is removed, secondary work such as cutting the anchors for fixing the slab and collecting crushed concrete debris is forced.

In view of these points, the present invention provides a deck slab at the contact area between the deck slab concrete of a bridge deck and a bridge girder, which is suitable for a low-pollution and economical bridge deck removal method, as described below. The present invention attempts to provide a method for cutting concrete in the horizontal direction.

(Structure of the Invention) (Means for Solving the Problems) The floor slab concrete and the floor slab fixed stone anchors at the contact portion of the deck concrete with the bridge girder are cut horizontally and the width direction is cut vertically. The above problem is solved by making blocks and removing the separated concrete blocks from the bridge girder.In detail, the concrete slab in contact with the bridge girder and the concrete slab at the contact area with the bridge girder are cut. A sawing wire is placed along the linear direction, and this sawing wire is movably held on a pair of guide rails that are attached to both sides of the deck concrete in the direction of the bridge girder, which are in contact with the +n girder, in alignment with the horizontal cutting line of the deck concrete. along the horizontal cutting line of the concrete floor slab through a floating pulley, and
The direction is changed using a direction changing pulley installed in the middle of the horizontal cutting line, and the sawing wire is rotatably guided in an endless manner to the rotating body of the driving device moving via the driving device moving rail, and the sawing wire is rotated. By rotating the machine by rotating the body and moving the drive device via the drive device movement rail, the sawing wire cuts the slab concrete and the floor slab fixing anchor in the horizontal direction. - By way of example, the floating pulley is such that it stops when the sawing wire makes a break due to the cutting resistance, and moves when the break becomes small or disappears.

(Function) In the above configuration, the slab concrete is cut horizontally along with the slab chamber 4 anchor at the contact area of the bridge girder with the slab concrete, and is also cut vertically in the width Q direction, so it can be easily removed. Concrete blocks of convenient size are formed.

Horizontal cutting is performed using a sawing wire, and the sawing wire is rotated by the rotation of a rotating body of a drive device that moves via a moving rail, and the cutting progresses. Move through and keep tension on the sawing wire. Further, the sawing wire is held by a combination of a pair of guide rails and a floating pulley to accurately hold the target cutting line and to prevent the sawing wire from becoming large in angle.

<Example) Next, embodiments of the present invention will be explained based on the drawings.

1 to 3 are schematic explanatory diagrams showing the cutting method, and show a side view, a plane view, and a cross section taken along the line AA in FIG. 1, respectively.

In the drawings, 1 is a bridge deck, 2 is a bridge girder, 3 is a deck fixing anchor, 4 is a sawing wire, 5 is a direction change pulley, 6 is a drive device, 7 is a drive device moving rail, 8 is an insertion hole, 9 is a The guide rail 10 is an idler pulley.

The bridge deck 1 is placed on the bridge girder 2 and fixed to the deck anchor 3.
It is established by The floor slab fixing anchor 3 is, for example, a combination of steel plates and reinforcing bars (a) as shown in FIG.
), stud dowels (b), reinforcing bars or horseshoes (C), square steel and reinforcing bars (d), and reinforcing bars (e) to strengthen the flanges 2a of the bridge girder 2 and the haunches 1a of the bridge deck 1. It has become established.

In the bridge deck 1 made in this manner, the haunch portion 1a, which is necessary in the concrete of the deck in contact with the bridge girder, is cut horizontally together with the deck fixing anchors 3, and the bridge deck 1
Cut the width direction vertically to make a concrete block, and separate the bridge deck 1 and the bridge girder 2. The cutting in the horizontal direction and the cutting in the vertical direction in the width direction may be performed before or after the cutting.

The cutting in the horizontal direction is performed by applying the sawing wire 4 to the cutting location and moving the sawing wire 4 in the horizontal direction while rotating it.

A generally used sewing wire 4 has a plurality of diamond beads 4 as shown in FIGS. 14 and 15.
The wire 4b is passed through the wire 4b to form an endless structure.

The sawing wire 4 is inserted into the insertion hole 8 which is perpendicular to the bridge girder 2 of the haunch portion 1a of the bridge deck 1, and is inserted into the concrete top surface of the deck slab on both sides of the haunch portion 1a in the direction of the bridge girder.
It is passed along the horizontal cutting line via an M movable pulley 10 movably held on a guide rail 9 attached to the horizontal cutting position of the haunch portion 1a. At the end of the haunch portion 1a, for example at the expansion joint position, the sawing wire 4 may be threaded along the end surface of the haunch portion 1a, for example at the expansion joint position, and along the direction of the cutting line on both sides without providing an insertion hole.

As shown in FIGS. 4 and 5, the guide rail 9 and floating pulley 10 are aligned with the cutting line position of the corbel portion 1a, and the corbel portion 1a is attached to the back surface of the bridge deck 1 with a length corresponding to the cutting length. You can install a pair with . The guide rail 9 is attached directly to the lower surface of the concrete slab (although it may be installed directly, in this embodiment, it is made of a steel plate in the shape of an opening and fixed to a steel plate 11, and this steel plate 11 is anchored 12 to the lower surface of the concrete slab). Another embodiment of how to install the guide rail 9 is shown in FIG. Bolt 2 to the attached support 22
3 and fixed. The floating pulley 10 is attached to a guide plate 13 that is movable along the guide rail 9, and the guide plate 13 has a held portion 14 that is moved by being bitten by a U-shaped portion of the guide rail 9. are doing. The guide rail 9 may have various shapes as shown in FIGS. 7 to 9, for example, and the held portion 14 of the floating pulley 10 may have a shape that is suitable for each shape.

The sawing wire 4, which is guided along the horizontal cutting line via the movable pulley 10 held by the guide rail 9 constructed in this manner, is changed direction by the direction changing pulley 5, which is provided with a step number in the middle of the horizontal cutting line.

In this embodiment, the direction is changed downward via the direction change pulleys 5 attached to both sides in the direction of the cutting line, and the direction is changed horizontally by the direction change pulleys 5 roughly below. This direction change allows the sawing wire 4 to be moved in the cutting direction as the cutting progresses, while maintaining a movement space for the receptacle.

A moving rail 7 for moving the drive device 6 is laid down below, and the drive device 6 is located therein. The sawing wire 4 whose direction has been changed is endlessly wound around a rotary body of a drive device 6 that moves via a drive device moving rail 7 laid down below so as to be rotatable by the rotation of the rotary body. The drive device 6 rotates the sawing wire 4 by the rotation of the rotating body, and the sawing wire 4 cuts the haunch portion 1a of the bridge deck 1, and as the cutting progresses, the moving rail 7
The drive device 6 moves via the sawing wire 4 to keep the tension of the sawing wire 4 constant.

Here, the guiding function of the guide rail 9 and the floating pulley 10 is to accurately hold the cutting line when cutting the haunch portion 1a and to reduce the angle of the sawing wire 4 at the cut surface, thereby reducing the load on the sawing wire 4. This is to reduce the

By controlling the movement of the floating pulley 10, for example, in combination with a device that electrically or mechanically controls the movement of the sawing wire 4, it is possible to firmly fix the floor plate as cutting progresses. When the wire reaches the anchor 3, the cutting resistance is large, an excessive load is applied to the wire, the bending angle of the wire becomes large, and an accident in which the wire breaks due to this is prevented.

Here, the movement of the M iJJ pulley 10 is controlled in an optimal situation by combining a device that controls electrically or mechanically in response to the angle of the sawing wire 4, for example.

Mechanical embodiments are shown in FIGS. 10 to 12.

Basically, the floating pulley 10 is guided by the guide rail 9 and moved by the movement of the drive device 6, but when the rotating sawing wire 4 has a large cutting resistance and an excessive load is applied, the floating pulley 10 is moved. When a break occurs, the sawing wire 4 stops moving, and moves when the break becomes small or disappears as cutting progresses, so that the saw wire 4 maintains a good break.

Examples thereof are shown in FIGS. 10 to 12 below.

The guide rail 9 is a toothed wheel 9a, and a toothed wheel as a held part 14 attached to a guide plate 13 to which an idler pulley 10 is fixed is held on the toothed rail 9a. The held portion 14 runs on the toothed rail 9a. The sawing wire 4 is brought into contact with the pulley 17 at the end of an arm 16 attached to the guide plate 13 by a hinge 15 from the direction in which tension is applied, and the arm 16 is pulled in the direction opposite to the cutting surface by a spring 20 around the hinge 15. It is now possible to The other end of the arm 16 is provided with an actuating device 19 for a brake device 18 that stops the movement of the held portion 14 when the distal end pulley 17 feels a certain tension.

Thus, by driving the drive device 6, the rotating body is rotated,
The sawing wire 4 is rotated, the driving bar 6 moves on the drive device moving rail 7, and the floating pulley 10 moves on the guide rail 9.
When a is moved through the held part 14 and a large cutting resistance is generated on the sawing wire 4, the sawing wire 4 forms a corner against the advancement of the 1!1 rib pulley 10, and the arm 16 also moves against the spring 20. The brake device 18 is activated by the actuating device 19 to lock the toothed wheel, which is the held portion 14. When the cutting progresses with a moderate amount of effort and the amount of effort becomes small, the brake device 18 is released,
The held portion 14 travels on the toothed rail 9a again, and the above-described progress is repeated.

Then, insert the sewing wire 4 into the insertion hole 8,
The rotating body of the driving device 6 is passed through a movable pulley 10 movably held by the guide rail 9, guided by the guide rail 9, changed direction, and wrapped endlessly around the rotating body of the driving device 6. When driven, the endless sawing wire 4 rotates under tension and cuts the inner surface of the insertion hole 8. And as the amputation progresses,
When the drive device 6 is moved along the moving rail 7, the sawing wire 4 does not make a large bend due to the floating pulley 10 (the tension is maintained, the cutting line is accurately held by the guide rail 9, and the cutting progresses in the horizontal direction). However, the haunch portion 1a of the bridge deck 1 was not separated from the bridge girder 2 together with the deck fixing anchors 3.

Thereafter, vertical cuts are made in the width direction at appropriate intervals to form concrete blocks. Note that cutting in the vertical direction in the width direction may be performed before cutting in the horizontal direction, and in this case, the cutting portion may be the insertion hole 8 for the sawing wire.

Then, the cut concrete blocks are lifted and removed by a known method, for example, using a large crane or the like as shown in FIGS. 16 to 17.

(Effects of the Invention) Since the present invention is made as described above, it has the following effects.

In claim (■■), since the concrete and the deck fixing anchors at the contact area between the concrete deck and the bridge girder are cut horizontally, the concrete slab is not cut in the vertical direction on both sides along the bridge girder as in the conventional method. By simply cutting at appropriate intervals in the vertical direction of the width, the concrete block is separated from the bridge girder and formed.

Therefore, there are fewer places to cut the slab concrete, and in addition, since the slab concrete is not cut from the bridge girder together with the slab anchors, crushing of the remaining concrete on the bridge girders, gas cutting of the slab fixing anchors, and concrete By omitting the waste collection work, the overall work time can be shortened.■ There is no need to crush the remaining concrete of the bridge girder, and no hydraulic crusher or the like is used for the breaker 1, which reduces noise and noise. X-shift, generates very little dust and has little effect on damage to the bridge girder; - Since the deck slab fixing anchors do not involve gas melting, adverse effects such as reverse warping of the bridge girder due to heat effects can be avoided; ■ Deck slab Since the contact area between the concrete and the bridge girder is cut in the horizontal direction,
It has the advantages of being able to do this without stopping traffic, and (2) reducing the overall time required, thereby reducing the impact on general traffic.

The unique effects of claim (■) include: (i) A floating pulley movably held by a pair of guide rails attached to the concrete slab on both sides in the direction of the bridge girder in line with the horizontal cutting line of the concrete slab; Since the sawing wire follows the horizontal cutting line of the concrete, the target cutting line can be held accurately. ■The sawing wire changes direction using a pulley for changing direction installed in the middle of the cutting line. It is possible to cut the concrete slab horizontally to the required length in the direction of the bridge girder. The unique effect of claim (■) is that the floating pulley stops when the sawing wire reaches a certain angle due to the cutting resistance, and moves when the angle becomes smaller or disappears. Can be well controlled.

[Brief explanation of drawings]

Figures 1 to 3 are schematic diagrams showing examples of cutting concrete slabs, where Figure 1 is a side view, Figure 2 is a plan view, and Figure 3 is a sectional view taken along line A-A in Figure 1. , FIG. 4 is a sectional view showing the cutting line holding device, FIG. 5 is a plan view thereof, FIG. 6 is a sectional view showing another embodiment of the cutting line holding device, and FIGS. 7 to 9
10 to 12 are schematic diagrams showing the control of the floating pulley, FIG. 10 is a sectional view, FIG. 11 is a plan view, and FIG. 12 is a side view. FIG. 13 is a schematic perspective view illustrating a floor plate fixing anchor, FIGS. 14 and 15 are schematic diagrams illustrating an example of a sewing wire, FIG. 14 is a plan view, and FIG. 15 is a sectional view. Figures 16 and 17 are schematic diagrams showing an example of concrete slab removal. Figure 16 is a schematic diagram in the width direction, Figure 17 is a schematic diagram in the longitudinal direction, and Figures 18 to 21. 1 is a schematic diagram showing a conventional example. In the drawings, 1 is a bridge deck, 2 is a bridge girder, 3 is a deck fixing anchor, 4 is a sawing wire, 5 is a direction change pulley, 6 is a drive device, 7 is a drive device moving rail, 8 is an insertion hole, 9 is a The guide rail 10 is a floating pulley. 111th! J Figure 2 Figure 3 f Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 11 Figure 1O Figure 11 Figure 12 Figure 13 (a) (b) Busy) (d ) ('e) Figure 16 Figure 18

Claims (2)

[Claims] (1) Place a sawing wire along the cutting line of the concrete slab at the contact point between the concrete slab that contacts the bridge girder and the concrete slab that contacts the bridge girder, and place this sawing wire on both sides of the concrete slab that contacts the bridge girder in the direction of the bridge girder. A floating pulley that is movably held on a pair of guide rails installed in line with the horizontal cutting line position of the concrete floor slab, and installed in the middle of the horizontal cutting line. A direction changing pulley is used to change the direction, and the sawing wire is rotatably guided in an endless manner to the rotating body of the driving device that moves via the driving device moving rail, and the sawing wire is rotated by the rotation of the rotating body, and the sawing wire is rotated by the rotation of the rotating body. A method for cutting a bridge deck in the horizontal direction, characterized by cutting the concrete deck and the deck anchor in the horizontal direction with a sawing wire by moving a drive device via a moving rail. (2) The floating pulley stops when the sawing wire makes a certain angle due to the cutting resistance, and moves when the angle becomes smaller or disappears. Cutting method.