JP2023091593A - Cutting device and assembling method thereof - Google Patents

Abstract

To provide a cutting device allowing efficient setting work and transfer work thereof, in a narrow work space under a concrete slab.SOLUTION: A cutting device cuts and separates a joint part of a concrete slab and a main girder of a bridge. The cutting device includes: a wire saw forming a cut surface along the main girder in the joint part; a driven pulley guiding the wire saw in a direction along the cut surface; a support mechanism detachably set on the main girder; and a driving unit supported by the support mechanism and making the wire saw travel around.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device used for cutting and separating joints between a concrete floor slab and a main girder, and a method for assembling the cutting device.

Bridge floor slab renewal work involves replacing deteriorated concrete floor slabs with new, highly durable floor slabs, and traffic must be blocked during this work. For this reason, although construction traffic regulations such as road closures for general vehicles and various traffic regulations are required, it is necessary to minimize the time of construction traffic regulations so as not to affect existing traffic as much as possible.

However, in the work of replacing with a new floor slab, the existing concrete floor slab must be removed from the bridge girder, and the removal work requires a great deal of work time. In particular, it took more time than non-synthetic structures to remove the concrete around the slip prevention of the synthetic girders, which was streamlined by integrating the behavior of the floor slabs and bridge girders.

Under these circumstances, in order to minimize the construction traffic control time, various floor slab cutting devices have been developed that can be placed under the floor slab so that the concrete floor slab cutting work can be started when the construction traffic regulation comes. . For example, Patent Literature 1 discloses a floor slab cutting device that cuts off a joint interface between a concrete floor slab and a bridge girder with a wire saw.

Specifically, a wire saw cutting device having a driving pulley, a fixed pulley and a moving pulley is arranged on one side of the bridge girder. Also, a driven pulley is arranged on the other side. All of these various pulleys are installed on the lower surface of the concrete floor slab so as to horizontally rotate within a horizontal plane including the joint interface between the concrete floor slab and the bridge girder. Also, the wire saw is passed through the small-diameter drilled portion in the vicinity of the joint boundary surface, and is wound around each of the pulleys.

In this state, when the driving pulley is operated, the wire saw travels in the extending direction, and a cutting operation is disclosed in which the joint boundary surface is cut. Since the wire saw relaxes as the cutting operation progresses, the position of the moving pulley relative to the fixed pulley is adjusted to pull the wire saw into the cutting device. In this way, the wire saw maintains a tension force capable of cutting the concrete floor slab, thereby forming a cut surface parallel to the joint boundary surface, and the concrete floor slab and the bridge girder can be cut and separated.

Japanese Patent No. 6626599

According to Patent Document 1, the work of cutting and separating the concrete floor slab and the bridge girder can be performed under the concrete floor slab. However, when installing the floor slab cutting device under the concrete floor slab in the preparatory stage before starting the cutting work, it becomes necessary to install the wire saw cutting device in a hanging state on the lower surface of the concrete floor slab.

In general, these are supported by drilling holes in the lower surface of the concrete floor slab to provide anchor holes and post-installed anchors. Such work has to be carried out by the worker in an upward posture, and is inferior in workability and safety. In addition, concrete floor slabs are often densely packed with reinforcing bars, which not only makes drilling work complicated, but also makes it difficult to install a wire saw cutting device if anchor holes are drilled while avoiding these reinforcing bars. Positional restrictions tend to make it difficult to install at a desired position.

In addition, in the floor slab cutting apparatus of Patent Document 1, the wire saw cutting apparatus is equipped with not only the drive pulley, fixed pulley, and moving pulley described above, but also various devices such as a driving device and a cooling device for the wire saw. is installed on the bottom of the As a result, the number of anchors to be provided for suspension support becomes enormous, and the installation work tends to become more complicated.

In addition, relocation work occurs as the cutting work progresses, but for each relocation work, post work to remove the wire saw cutting device Work to remove the anchor and post work to install the wire saw cutting device at the relocation destination A work for constructing the anchor occurs, which may require a great amount of work time. In addition, since these wire cutting devices are installed on the lower surface of the concrete floor slab, the work space under the concrete floor slab, which has a low head space, tends to become narrower, and a problem arises in the work environment.

The present invention has been made in view of such problems, and its main purpose is to efficiently install and relocate a cutting device in a narrow working space under a concrete floor slab.

In order to achieve such an object, the cutting device of the present invention is a cutting device for cutting and separating a joint between a concrete floor slab and a main girder of a bridge, wherein the joint forms a cut surface along the main girder. a wire saw, a driven pulley that guides the wire saw in a direction along the cut surface, a support mechanism detachably installed on the main girder, and a drive that is supported by the support mechanism and causes the wire saw to circulate. and a unit.

The cutting device of the present invention is characterized in that the support mechanism is installed on the lower flange of the main girder or on the horizontal structure connected to the main girder.

The cutting device of the present invention is characterized in that the support mechanism is installed on the web of the main girder.

The cutting device of the present invention is characterized in that it is installed on the vertical stiffening member of the main girder.

A cutting device according to the present invention is a cutting device for cutting and separating a joint between a concrete floor slab and a main girder of a bridge, comprising: a wire saw for forming a cut surface along the main girder at the joint; a driven pulley that guides the wire in a direction along the cut surface; a drive unit that circulates the wire saw; and a drive unit for driving the saw in a circular motion.

In the cutting apparatus of the present invention, the drive unit includes a drive mechanism including a drive pulley, a storage mechanism including a guide pulley around which the excess length of the wire saw is wound, and an extension of the wire saw along the cut surface. and a guide mechanism including a direction changing portion that changes the current direction.

In the cutting device of the present invention, the drive unit includes a frame detachably installed on the support mechanism, the frame is provided on the drive mechanism and a columnar pulley guide on which the drive pulley is installed; A columnar pulley holder provided in the storage mechanism and on which the guide pulley is installed, and a beam-like connecting member provided in the guide mechanism, in which the direction changing portion is provided and which connects the pulley guide and the pulley holder. , and

The cutting device of the present invention is characterized in that the frame is fixed to the support mechanism at at least three points.

A method for assembling a cutting apparatus according to the present invention is characterized by comprising the steps of: installing the support mechanism on the main girder or the opposing tilting structure; and installing the drive unit on the support mechanism.

According to the cutting device and assembly method of the present invention, the cutting device is provided with a support mechanism detachably installed on the main girder or the opposing tilting structure, and a drive unit supported by the support mechanism and causing the wire saw to circulate. As a result, workers do not have to perform complicated work such as installing anchors under concrete floor slabs using post-construction anchors in an upward posture, or setting anchor holes by avoiding reinforcing bars in concrete floor slabs. The drive unit can be installed below the concrete slab. In addition, in the relocation work that occurs each time the cutting work progresses, after removing the drive unit and removing the support mechanism from the main girder, this support mechanism is installed on the main girder of the relocation destination, and the drive unit is installed again. Just do it.

Therefore, it is possible to improve the efficiency of work related to the installation and relocation of the entire cutting device including the drive unit, which is performed under the concrete floor slab. In addition, since there are no restrictions on the installation position of the drive unit and there is a high degree of freedom, it is possible to install the drive unit while adjusting the position so as to secure a sufficient working space in a narrow area under the concrete floor slab. This makes it possible to improve the workability of the entire work of cutting and separating the concrete floor slab and the main girder.

Furthermore, the frame of the drive unit can be assembled simply by connecting the columnar pulley guide provided in the drive mechanism and the columnar pulley holder provided in the storage mechanism with the beam-like connecting member provided in the guide mechanism. . Further, the drive unit can be installed below the concrete floor slab simply by installing the frame on the support mechanism. As a result, compared to the case where the drive mechanism, the storage mechanism, and the guide mechanism are handled individually, it is possible to reduce the work processes related to installation and save labor.

Further, by fixing the assembled frame to the support mechanism at least at three points, the drive unit including the frame can be stably supported by the support mechanism. When relocating the cutting device, it is also possible to relocate the assembled frame, that is, each drive unit. Become.

In addition, the drive unit includes a direction changer that changes the extending direction of the wire saw along the cut surface. As a result, the wire saw can change its extending direction and travel along the web of the main girder, so that the drive unit can be erected along the web of the main girder. Therefore, the installation position of the drive unit can be adjusted, and the degree of freedom of the installation position can be increased.

According to the present invention, since the supporting mechanism is detachably installed on the main girder or the counter-tilting structure, and the driving unit is supported by the supporting mechanism and causes the wire saw to travel around, a narrow working space under the concrete floor slab is provided. Therefore, it is possible to efficiently install and relocate the cutting device including the drive unit.

It is a side view which shows the cutting device seen from the bridge axis direction in embodiment of this invention. It is a top view of a cutting device in an embodiment of the invention. It is a figure which shows a mode that a cut surface is formed with the cutting device in embodiment of this invention. 4A and 4B are a front view and a plan view of a drive unit and a support mechanism according to an embodiment of the present invention; FIG. It is a figure which shows the other example of the installation position of the support mechanism in embodiment of this invention. FIG. 10 is a view (viewed from the direction perpendicular to the bridge axis) showing another example (part 1) of the support mechanism that supports the drive unit in the embodiment of the present invention; FIG. 10 is a diagram (front view) showing another example (No. 1) of the support mechanism that supports the drive unit according to the embodiment of the present invention; FIG. 10 is a view (viewed from the direction orthogonal to the bridge axis) showing another example (part 2) of the support mechanism that supports the drive unit in the embodiment of the present invention; FIG. 11 is a diagram (front view) showing another example (part 2) of the support mechanism that supports the drive unit according to the embodiment of the present invention; FIG. 11 is a view (viewed from the direction orthogonal to the bridge axis) showing another example (3) of the support mechanism that supports the drive unit according to the embodiment of the present invention; FIG. 11 is a diagram (front view) showing another example (No. 3) of the support mechanism that supports the drive unit according to the embodiment of the present invention; It is a figure (front view) which shows the other example of the drive unit in embodiment of this invention. FIG. 10 is a diagram (plan view) showing another example of the drive unit according to the embodiment of the present invention;

The present invention relates to a cutting device used for cutting and separating concrete floor slabs and main girders in floor slab renewal work of highway bridges, comprising a support mechanism detachably installed on the main girders or opposite tilting structure, and comprising: By supporting the driving unit that rotates the wire saw with the support mechanism, work efficiency is improved when the driving unit is installed under the concrete floor slab.

The details of the cutting device and the method of assembling the cutting device will be described below with reference to FIGS. explain. Note that the cutting method using a wire saw is not limited to the push cutting method, and other cutting methods such as the pull cutting method, for example, can also be employed.

The bridge 200, as shown in FIG. 1, has a main girder 201 made of steel and a concrete floor slab 202 installed on the main girder 201. On the lower surface of the concrete floor slab 202 is a joint with the main girder 201. A haunch portion 204 is formed. A headed stud 2011 installed on the upper flange 201c of the main girder 201 is embedded in the haunch portion 204 . The headed stud 2011 is a member that functions as a slip stopper in the substantially horizontal direction (mainly in the bridge axis direction) of the concrete floor slab 202 .

In the bridge 200 having a composite structure in which the concrete floor slab 202 and the steel main girder 201 are integrated, when the floor slab replacement work is carried out, first of all, it is widely used when cutting the concrete structure. Using a cutting device 100 equipped with a wire saw 10, a cut surface C is formed on the haunch portion 204 as shown in FIG. After that, the concrete floor slab 202 cut and separated from the main girder 201 is removed and replaced with a new concrete floor slab. A cutting apparatus 100 equipped with a wire saw 10 that is used to form the cut surface C on the haunch portion 204 will be described below.

<<<<Cutting device 100>>>>
The wire saw 10 is a member obtained by processing a diamond saw wire into an endless shape, and the cutting device 100 has a structure as shown in FIG.

First and second front support devices 40a and 40b, first and second rear support devices 50a and 50b, and a drive unit D are provided in order along the extending direction of the wire saw 10. As shown in FIG. The drive unit D also includes a drive mechanism 20 , a storage mechanism 30 and a guide mechanism 70 . Furthermore, as shown in FIG. 1, the cutting device 100 includes a support mechanism 80 that supports the drive unit D, and a pair of running rails 60 provided on both sides of the haunch portion 204 .

The pair of running rails 60 includes a guide portion 61 extending along the main girder 201 and a guide support 62 supporting the guide portion 61, as shown in FIGS. The guide support 62 is detachably installed on the lower surface of the concrete floor 202 and suspends the guide portion 61 . Further, the guide support 62 is installed slidably with respect to the guide portion 61 , and the guide portion 61 is installed movably in the height direction with respect to the guide support 62 .

As shown in FIG. 2, the first and second rear support devices 50a, 50b include third to fifth driven pulleys 51, 52, 53 around which the wire saw 10 is wound, and a pulley stand 56 for supporting them. and Further, as shown in FIG. 1, the pulley mount 56 drives a moving body 55 that moves along a guide portion 61 formed on the lower surface side of the running rail 60, and drives the moving body 55 to move the first and second rear wheels. It has a feeding device 54 for moving the supporting devices 50a, 50b.

A pinion is adopted as the moving body 55 , and the pulley mount 56 is supported on the upper surface side of the running rail 60 . As shown in FIG. 2, the first and second front support devices 40a and 40b are arranged in front of the first and second rear support devices 50a and 50b (upper side of the drawing).

As shown in FIGS. 2 and 3, the first and second front supporting devices 40a and 40b include first and second driven pulleys 41 to 42 around which the wire saw 10 is wound, and a pulley stand for supporting them. 46. Further, the pulley mount 46 drives the moving body 45 that moves along the guide portion 61 formed on the lower surface side of the running rail 60, similarly to the first and second rear support devices 50a and 50b. A feeding device 44 is provided.

First and second driven pulleys 41 to 42 supported by the first and second front support devices 40a and 40b, and third to fifth driven pulleys 41 to 42 supported by the first and second rear support devices 50a and 50b. The driven pulleys 51 to 53 are pulleys that rotate in the horizontal direction and change the direction of the wire saw 10 in the horizontal plane. The wire saw 10 penetrates the haunch portion 204 between the first driven pulley 41 and between the third driven pulley 51 . In this embodiment, the horizontal direction means the direction parallel to the upper flange 201c of the main girder 201. As shown in FIG.

≪≪Drive unit≫≫
As shown in FIG. 2, the drive unit D is an integral structure in which the drive mechanism 20 and the storage mechanism 30 are connected by a guide mechanism 70. As shown in FIG. It is arranged below the concrete floor slab 202 in a standing position.

The drive mechanism 20 applies constant tension and high-speed rotational force to the wire saw 10. As shown in FIG. 23 , and a flat support plate 221 is installed at the lower end of the pulley guide 22 . A drive pulley 21 that rotates the wire saw 10 and a drive unit 24 that drives the drive pulley 21 are installed in the lifting device 23 . The drive pulley 21 is installed on the lifting device 23 via a horizontal shaft, and rotates vertically around the horizontal shaft to impart a high-speed rotational force to the wire saw 10 that is wound around the drive pulley 21 . In addition, tension is applied to the wire saw 10 by moving up and down along the pulley guide 22 via the lifting device 23.

The storage mechanism 30 stores the surplus portion of the wire saw 10 while maintaining it in a state where a constant tension force is applied. It is a mechanism for feeding out the wire saw 10 step by step when 40b moves forward. Any structure may be employed as long as it has these functions.

In FIG. 4(a), as the storage mechanism 30, an upright pulley holder 31 having first to third guide pulleys 32 to 34 rotating in the vertical direction is employed. A jack base 35 is provided at the lower end of the pulley holder 31 , and the height position of the base portion 352 can be adjusted by expanding and contracting the jack portion 351 . The drive unit D is provided with a pair of storage mechanisms 30 having such a configuration on both sides of the drive mechanism 20 in the bridge axis direction.

As shown in FIG. 4( a ), the guide mechanism 70 includes a beam-like connecting member 71 and is provided so as to connect the columnar pulley holder 31 and the columnar pulley guide 22 in the vicinity of their upper portions. Further, the guide mechanism 70 includes first and second direction changing portions 72, 73 around which the wire saw 10 is wound, and first and second guide pulleys 74, 75, which are attached to the connecting member 71. is set up. The first and second guide pulleys 74 , 75 are vertically rotating pulleys from the drive mechanism 20 to the other of the paired storage mechanisms 30 and from one of the paired storage mechanisms 30 to the drive mechanism 20 . , respectively guide the wire saw 10 .

The first and second turning sections 72,73 comprise horizontal pulleys 721,731 and vertical pulleys 722,732, respectively. As shown in FIG. 2, the first direction changer 72 twists the wire saw 10 that is delivered from the first rear support device 50a to one of the paired storage mechanisms 30. As shown in FIG. The second direction changer 73 twists the wire saw 10 sent from the other of the paired storage mechanisms 30 to the first front support device 40a. In this embodiment, the vertical direction means a direction parallel to the web 201b of the main girder 201. As shown in FIG.

As described above, in the drive unit D, the pulley guide 22 and the pulley holder 31 are connected by the connecting member 71, so that the frame F is formed with these as pillars and beams. 4, it can be seen that the frame F is formed by the pulley guide 22, the two pulley holders 31, and the connecting member 71. As shown in FIG. In the cutting device 100, the drive unit D is supported by the support mechanism 80 by installing the frame F on the support mechanism 80. As shown in FIG.

≪≪Support Mechanism≫≫
As shown in FIG. 4B, the support mechanism 80 includes a drive support beam 81 on which the pulley guide 22 is installed, a storage support beam 82 on which the pulley holder 31 is installed, and a plurality of clamping fittings 83. It has

The drive support beam 81 extends in the direction perpendicular to the bridge axis perpendicular to the main girder 201 and is composed of two elongated members 81a arranged in parallel with a gap therebetween. These are arranged so as to span adjacent main girders 201 , and both ends thereof are placed on the lower flanges 201 a of the main girders 201 . Further, the storage support beam 82 is composed of one elongated member, and is arranged so as to bridge the main girder 201 parallel to and adjacent to the drive support beam 81 , and both ends thereof are located under the main girder 201 . It rests on the flange 201a. A C-shaped clamp, a vise, or the like can be employed as the clamping fitting 83, and the C-shaped clamp is employed in this embodiment.

<<Installation structure between support mechanism 80 and lower flange 201a of main girder 201>>
Both the drive support beam 81 and the storage support beam 82 are, as shown in FIG. there is The means for fastening and fixing the driving support beam 81 and the storage support beam 82 to the lower flange 201a of the main girder 201 is not limited to the clamping metal fittings 83, and has a structure that can be installed detachably. If necessary, any means other than tightening and fixing may be adopted.

Further, H-shaped aluminum steel is used as the long member 81a constituting the drive support beam 81 and the storage support beam 82, but any member that can support the drive unit D can be used. Alternatively, other elongated steel materials having different cross-sectional shapes or materials other than steel materials may be employed.

<<Installation Structure of Support Mechanism 80 and Drive Unit D>>
In the support mechanism 80 having the configuration described above, the pulley guide 22 is installed on the driving support beam 81 via the sandwiching member 91 as shown in FIG. 4(a). Also, the pulley holder 31 is installed on the storage support beam 82 via the clamping fitting 95 .

The holding member 91 includes a through bolt 92, a through bolt fixture 93 fixed to one end of the through bolt 92, and a support base 94 having a through hole (not shown) through which the through bolt 92 passes. A support plate 221 for the pulley guide 22 is installed on the support pedestal 94 , and the support plate 221 is also provided with a through hole (not shown) through which the through bolt 92 passes.

These are arranged so that the through-bolt fixture 93 abuts the lower flange of the drive support beam 81 . Further, a support frame 94 is arranged so as to be placed on the upper flange of the drive support beam 81 . A through bolt 92 is arranged to pass through the driving support beam 81 , the support frame 94 and the support plate 221 . In this state, as shown in FIG. 4B, the nut 92a provided on the through-bolt 92 is rotated, and the through-bolt fixture 93 and the support base 94 are tightened to fix the driving support beam 81. As shown in FIG.

In this way, the pulley guide 22 constituting the frame F is detachably fastened and fixed to the driving support beam 81 via the clamping member 91 . Although only one combination of the through bolt 92, the through bolt fixture 93, and the nut 92a may be used for the support frame 94, here, as shown in FIGS. , two sets are installed with an interval therebetween, and are fixed by tightening at two points.

On the other hand, the clamping metal fitting 95 is similar to the clamping metal fitting 83 constituting the support mechanism 80, and a clamp, a vise, or the like can be adopted. are listed. The clamping fitting 95 clamps the base portion 352 of the jack base 35 provided on the pulley holder 31 and the storage support beam 82 . As a result, the pulley holder 31 that constitutes the frame F is detachably fastened and fixed to the storage support beam 82 via the clamping fitting 95 .

As described above, the frame F is provided with two fixing points by through bolts 92 between the pulley guides 22 and the drive support beams 81, and between the two pulley holders 31 and the storage support beams 82. , and fixing points by clamping metal fittings 95 are provided, and the support mechanism 80 is firmly installed by a total of four fixing points. As a result, the drive unit D is detachably attached to the support mechanism 80 and is firmly installed and supported in a stable state.

The drive unit D can be stably installed on the support mechanism 80 if there are at least three fixed points. Therefore, for example, only one of the two pulley holders 31 may be tightened and fixed by the clamping member 95 , and the base portion 352 of the jack base 35 may be brought into contact with the upper surface of the storage support beam 82 for the other.

≪≪Method for assembling cutting device and method for cutting and separating concrete floor slab and main girder≫≫
The procedure for assembling the cutting device 100 having the above-described configuration in the construction target area and the procedure for forming the cut surface C on the haunch portion 204 with the cutting device 100 are as follows.

<Assembly work of the cutting device>
First, as shown in FIGS. 4A and 4B, the support mechanism 80 is installed on the lower flange 201a of the main girder 201. As shown in FIG. The support mechanism 80 arranges the drive support beam 81 at a position facing the pulley guide 22 of the frame F, and arranges the storage support beam 82 at a position facing the pulley holder 31 of the frame F, respectively. Both ends of these parts are clamped and fixed to the lower flanges 201a of the adjacent main girders 201 with clamping fittings 83, respectively.

After that, the frame F provided for the drive unit D is installed on the support mechanism 80, and the drive unit D is supported by the support mechanism 80. As shown in FIG. In other words, the driving support beam 81 is fixed to the pulley guide 22 via the clamping member 91 by tightening. Also, the pulley holder 31 is fastened and fixed to the storage support beam 82 via the clamping fitting 95 . The drive unit D has the drive mechanism 20, the storage mechanism 30, and the guide mechanism 70 assembled in advance, is carried in with the frame F, and the frame F is installed on the support mechanism 80 as described above. Alternatively, the drive mechanism 20, the storage mechanism 30, and the guide mechanism 70 may be separately brought in and installed on the support mechanism 80 while being assembled.

In this way, the drive unit D is supported on the support mechanism 80 in a state of standing parallel to the web 201b of the main girder 201, as shown in FIG. In this way, since there is no restriction on the installation position of the drive unit D and there is a high degree of freedom, the drive unit D is installed while adjusting the position so as to secure a sufficient working space in the narrow area under the concrete floor slab 202. can also Therefore, it is possible to improve the workability of the entire work for cutting and separating the concrete floor slab 202 and the main girder 201 .

Before, after, or at the same time as these operations, as shown in FIG. 1, an insertion hole 205 for inserting the wire saw 10 is provided at the haunch portion 204 of the concrete floor slab 202 at the start position of the horizontal cutting operation. Also, a pair of running rails 60 are installed at predetermined positions on the lower surface of the concrete floor slab 202 in a suspended state via anchor bolts (not shown). At the same time, the first and second front supporting devices 40a, 40b and the first and second rear supporting devices 50a, 50b are installed on the running rail 60, and the wire saw 10 is hung to cut as shown in FIG. Assemble the device 100 .

<Cut and separate the concrete floor slab and main girder>
When the cutting device 100 is assembled, the drive mechanism 20 is operated to impart a rotational force in the extension direction so that the wire saw 10, which penetrates the haunch portion 204 in the direction perpendicular to the bridge axis, can travel around. Then, the wire saw 10 moves the first and second driven pulleys 41 to 42 provided on the first and second front support devices 40a and 40b, and the first and second driven pulleys 41 to 42 provided on the first and second rear support devices 50a and 50b. 3 Driven pulleys 51-53 in the horizontal direction, is sent to the drive unit D.

As shown in FIG. 4( a ), the wire saw 10 is changed from horizontal to vertical by the first direction changer 72 in the drive unit D, and then moved to the first direction in one of the paired storage mechanisms 30 . It runs vertically on the first to third guide pulleys 32 to 34 . It is then fed into the drive mechanism 20 via the second guide pulley 75 of the guide mechanism 70 . Then, it runs vertically on the first to third guide pulleys 32 to 34 of the storage mechanism 30 via the drive pulley 21 and the first guide pulley 74 of the guide mechanism 70 .

After the wire saw 10 has its running direction changed from vertical to horizontal at the second direction changing portion 73, the first and second driven pulleys 41 provided on the first and second front support devices 40a and 40b are moved. ~42. After that, tension is applied to the wire saw 10 that travels in a circle so that the cut surface C can be formed on the haunch portion 204 . Tension can be adjusted by moving drive pulley 21 along pulley guide 22 .

At the same time, while the first and second rear support devices 50a and 50b are stopped, the first and second front support devices 40a and 40b are moved along the running rail 60 in a direction away from them. Then, the wire saw 10 positioned between the first and second front supporting devices 40 a and 40 b is pressed against the height at which the cut surface C of the haunch portion 204 is to be formed. As a result, as shown in FIG. 2 , the wire saw 10 moves in the bridge axis direction along the main girder 201 while being pressed against the planned formation position of the cut plane C while traveling in a circular motion in the extending direction.

At this time, as shown in FIG. 3B, the drive pulley 21 is moved along the pulley guide 22 as the wire saw 10 moves along the main girder 201 in the bridge axis direction. As a result, the wire saw 10 is sent out from the drive unit D, so that the wire saw 10 always maintains a tension capable of forming the cutting plane C. As shown in FIG. As a result, the wire saw 10 can form the cut surface C on the haunch portion 204 by the press cutting method.

When the drive pulley 21 has moved to the upper end of the pulley guide 22 as shown in FIG. The excess length of the wire saw 10 is fed out. This operation is repeated to form a cut surface C on the haunch portion 204 .

When the excess length of the wire saw 10 stored in the storage mechanism 30 is fully extended, the operation of forming the cut surface C is stopped. After that, when the operation of forming the cut surface C is to be continued, the cutting device 100 is moved to the next arrangement position. Moreover, when finishing the work of forming the cut surface C, the cutting device 100 is removed.

<Relocation work of the cutting device>
When relocating the cutting device 100, the clamping member 91 and the clamping fitting 95 are removed from the frame F of the drive unit D, and the fastening is released. Next, the clamping fittings 83 of the support mechanism 80 are removed, and the tightening fixation between the driving support beam 81 and the storage support beam 82 and the lower flange 201a of the main girder 201 is released. After that, at the destination, the driving support beam 81 and the storage support beam 82 are placed on the lower flange 201a of the main girder 201, and the lower flange 201a of the main girder 201 is clamped by the clamping metal fittings 83 in the same manner as the installation described above. pinch together.

Next, the assembled drive unit D is moved to the relocation destination, and the pulley guide 22 is tightened and fixed to the driving support beam 81 of the support mechanism 80 previously installed at the relocation destination via the holding member 91 . Also, the pulley holder 31 is tightened and fixed to the storage support beam 82 via the clamping fitting 95 . In this way, it is possible to move the assembled frame F, that is, the drive unit D together, and it is possible to shorten the construction period for the entire work of cutting and separating the concrete floor slab 202 and the main girder 201 . These relocation operations may be carried out while once dismantling the drive unit D and then reassembling it on the support mechanism 80 installed at the relocation destination.

In this way, by the steps of installing the support mechanism 80 on the lower flange 201a of the main girder 201 and installing the frame F provided in the drive unit D on the support mechanism 80 and supporting the drive unit D on the support mechanism 80, , the driving unit D can be installed under the concrete floor slab 202, therefore, the work related to the installation and relocation of the entire cutting device 100 including the driving unit D, which is performed under the concrete floor slab 202, can be made more efficient. becomes possible.

<<<When the horizontal structure is connected to the lower flange 201a of the main girder 201>>>>
The support mechanism 80 provided so as to span the lower flanges 201 a of the adjacent main girders 201 may be installed on the lateral structure 205 . As shown in FIG. 5 , the horizontal structure 205 is a member that spans the adjacent main girders 201 via gusset plates 206 so as to obliquely move with respect to the direction of the bridge axis. The gusset plate 206 is fixed by welding to the web 201b in a posture parallel to the lower flange 201a, and is a member used not only for connecting the horizontal structure 205 but also for connecting the opposing tilting structure 203 and the main girder 201. be.

Therefore, for example, the storage support beam 82 is fastened and fixed to the horizontal structure 205 via the clamping metal fittings 83 , and the driving support beam 81 is fastened to the lower flange 201 a of the main girder 201 or the gusset plate 206 via the clamping metal fittings 83 . For example, it may be fastened and fixed. Alternatively, at least one of the storage support beam 82 and the drive support beam 81 may be fastened and fixed to the lateral structure 205 via clamping fittings 83 . When the horizontal structure 205 employs angle members, when the drive support beam 81 and the storage support beam 82 and the horizontal structure 205 are fastened and fixed via the clamping metal fittings 83, there is a gap between them. It is good to bite the backing material etc.

≪≪Other Examples of Supporting Mechanisms≫≫
In the support mechanism 80 described above, the driving support beam 81 and the storage support beam 82 are fixed by tightening them to the lower flange 201a of the main girder 201 via the clamping metal fittings 83. Instead, any means that can be detachably installed, such as a magnet, may be used.

Further, if the drive support beam 81 and the storage support beam 82 can support the drive unit D below the concrete floor slab 202, their installation positions and shapes are not restricted at all. Further, the driving support beam 81 and the storage support beam 82 may not be separated, and a dual-purpose support beam 84 that integrates the functions of both may be employed. Other examples of the support mechanism 80 are shown below.

<<<Example of installing the support mechanism 80 on the web 201b of the main girder 201>>>>
6 and 7, the support mechanism 80 includes a drive support beam 81, a storage support beam 82, a plurality of magnet members 85, and reinforcements that reinforce the drive support beam 81 and the storage support beam 82. a member 86;

The driving support beam 81 is composed of a pair of elongated members 81a. there is Since the driving support beam 81 is configured like a cantilever beam in this way, a reinforcing member 86 is provided on the upper surface side of the base end. The reinforcing member 86 includes a vertical member 861 standing upward from the upper surface near the base end of the driving support beam 81, and a diagonal member 862 connecting the upper end of the vertical member 861 and the longitudinal intermediate portion of the driving support beam 81. It is composed of

The storage support beam 82 is composed of a pair of long members 82b, and similarly to the drive support beam 81, the tip extends laterally from the web 201b of the main girder 201, and the base end extends from the web of the main girder 201. 201b and configured like a cantilever beam. Therefore, although illustration is omitted, a reinforcing member is provided on the upper surface side of the base end in the same manner as the driving support beam 81 .

<<Installation Structure of Support Mechanism 80 and Drive Unit D>>
In the support mechanism 80 configured as described above, the pulley guide 22 is installed on the driving support beam 81 via the above-described clamping member 91 . Also, the pulley holder 31 is installed on the storage support beam 82 through the clamping metal fittings 95 described above. The drive unit D is thus firmly installed on the support mechanism 80 .

In FIG. 6, the pair of elongated members 81a forming the drive support beam 81 and the pair of elongated members 82a forming the storage support beam 82 are made of angle-shaped aluminum steel. However, as long as the member is capable of supporting the drive unit D, it may not necessarily be made of steel, and may be made of any material having any cross-sectional shape.

<<<Example of installing the support mechanism 80 on the vertical stiffening member 201d of the main girder 201>>>>
As shown in FIGS. 8 and 9, the support mechanism 80 includes a dual-purpose support beam 84 that integrates the functions of the drive support beam 81 and the storage support beam 82, a clamping member 83, and a plurality of A bracket 87 is provided.

As shown in FIG. 8, the bracket 87 is a cantilever-shaped member whose tip extends laterally from the web 201b of the main girder 201, and whose base end is a vertical support of the main girder 201 via the clamping metal fittings 83. It is detachably installed with respect to the rigid member 201d. A plurality of such brackets 87 are installed on each of the vertical stiffening members 201d adjacent to each other in the direction of the bridge axis. there is

A dual-purpose support beam 84 is installed so as to bridge these four vertical stiffening members 201d. As shown in FIG. 8, the dual-purpose support beam 84 is formed by arranging a pair of long members 84a extending in the bridge axis direction parallel to the main girder 201 with a gap therebetween. Further, as shown in FIG. 9, it is mounted on the upper surfaces of the plurality of brackets 87 described above, and is detachably installed via clamping metal fittings 83 . For the pair of elongated members 84a constituting the dual-purpose support beam 84, groove-shaped aluminum steel is adopted. However, as long as the member is capable of supporting the drive unit D, it may not necessarily be made of steel, and may be made of any material having any cross-sectional shape.

<<Installation Structure of Support Mechanism and Drive Unit D>>
As shown in FIG. 9, the support mechanism 80 having the above-described structure has a dual-purpose support beam 84 arranged over the lower positions of the pulley guides 22 and the pulley holders 31 that constitute the frame F provided in the drive unit D. there is For this reason, the pulley guide 22 is installed on the combined support beam 84 via the clamping member 91 described above, and the pulley holder 31 is installed via the clamping metal fitting 95 described above. The drive unit D is thus firmly installed on the support mechanism 80 .

In this case also, the pulley guide 22 is fastened and fixed to the combined support beam 84 at two points. Specifically, as shown in FIG. 9, two sets of combinations of through-bolts 92, through-bolt fixtures 93, and nuts 92a, which constitute a clamping member 91, are installed with the pulley guide 22 interposed therebetween.

<<<Case in which the support mechanism 80 is installed on the opposing tilting structure 203 or the horizontal girder>>>>
As shown in FIGS. 10 and 11, the support mechanism 80 includes a dual-purpose support beam 84 that integrates the functions of the drive support beam 81 and the storage support beam 82, and clamping hardware 83. there is The support mechanism 80 is installed so as to bridge the adjacent counter-tilting structure 203, the adjacent horizontal girder, or the adjacent counter-tilting structure 203 and the horizontal girder.

The opposing tilting structure 203 is a frame-shaped member that combines vertical members, horizontal members, and diagonal members. Both of them are members arranged with a gap between them and the concrete floor slab 202 in the bridge axis direction, and the support mechanism 80 is installed using this gap. The details will be described below by exemplifying the case of providing the adjacent opposing tilting structures 203 .

As shown in FIG. 10, the dual-purpose support beam 84 is formed by arranging a pair of long members 84a extending in the bridge axis direction parallel to the main girder 201 with a gap therebetween. As shown in FIG. 11, these are mounted on the upper surface of the adjacent counter-tilt structures 203 so as to bridge them, and are detachably installed via clamping metal fittings 83 . H-shaped aluminum steel is used for the pair of long members 84a that constitute the dual-purpose support beam 84. As shown in FIG. However, as long as the member is capable of supporting the drive unit D, it may not necessarily be made of steel, and may be made of any material having any cross-sectional shape.

<<Installation Structure of Support Mechanism and Drive Unit D>>
As shown in FIG. 11, the support mechanism 80 configured as described above has a dual-purpose support beam 84 disposed over the pulley guide 22 and the pulley holder 31 that constitute the frame F provided in the drive unit D. there is For this reason, the pulley guide 22 is installed on the combined support beam 84 via the clamping member 91 described above, and the pulley holder 31 is installed via the clamping metal fitting 95 described above.

Specifically, as shown in FIG. 10 , the clamping member 91 abuts the through-bolt fixture 93 on the upper surface side of the lower flange of the dual-purpose support beam 84 , and also places the support pedestal 94 on the lower flange of the dual-purpose support beam 84 . The through bolts 92 are passed through the bolt holes (not shown) of the support frame 94 and the dual-purpose support beams 84 by contacting the lower surface side. In this state, the pulley guide 22 attached to the support base 94 is rotated by rotating the nut 92 a provided on the through bolt 92 and clamping the lower flange of the combined support beam 84 between the through bolt fixture 93 and the support base 94 . is suspended and fixed to the dual-purpose support beam 84 .

On the other hand, as shown in FIG. 11, the pulley holder 31 is clamped and fixed to the dual-purpose support beam 84 via clamping fittings 95 (not shown). Although any clamping and fixing method may be used, for example, if a support plate or the like that protrudes horizontally is attached to the upper end of the pulley holder 31 and the lower flange of the dual-purpose support beam 84 is clamped by clamping metal fittings 95, it can be easily fixed. The pulley holder 31 can be suspended and fixed to the dual-purpose support beam 84 .

In this case also, the pulley guide 22 is fastened and fixed to the dual-purpose support beam 84 at two points. Specifically, as shown in FIG. 11, two sets of combinations of through-bolts 92, through-bolt fixtures 93, and nuts 92a, which constitute a clamping member 91, are installed with the pulley guide 22 interposed therebetween. The drive unit D is thus firmly installed on the support mechanism 80 .

The floor slab cutting and separating system and the concrete floor slab and main girder cutting and separating method of the present invention are not limited to the above embodiments, and various modifications are possible without departing from the scope of the present invention.

For example, in the present embodiment, the drive unit D is provided with the storage mechanisms 30 on both sides in the bridge axis direction with the drive mechanism 20 interposed therebetween, but the present invention is not necessarily limited to this. The number of storage mechanisms 30 can be increased or decreased as appropriate according to the length of the extra length of the wire saw 10. For example, in FIG. is cited as an example.

In this case also, as shown in FIG. 12(b), there are two fixed points by the through bolts 92 of the pulley guide 22 and the drive support beam 81, and one by the clamping metal fittings 95 of the pulley holder 31 and the storage support beam 82. There are 3 fixed points in total. Therefore, the drive unit D can be stably installed with respect to the support mechanism 80 .

When only one storage mechanism 30 is provided, as shown in FIGS. 12A and 13 , the storage mechanism 30 should be provided on the front side of the drive mechanism 20 in the traveling direction of the wire saw 10 . In this way, chatter vibration continuously occurring between the position where the wire saw 10 of the haunch portion 204 is pressed and the drive mechanism 20 is suppressed, and damage to the wire saw 10, detachment from the drive pulley 21, and cutting It is possible to suppress the deterioration of the accuracy of the surface C and the like.

Further, in the present embodiment, the first and second front support devices 40a and 40b are moved away from the stopped first and second rear support devices 50a and 50b, and the haunch is cut by the press cutting method. The case where the cut surface C is provided in the portion 204 is taken as an example. However, it is not limited to this.

It is also possible to stop the first and second front support devices 40a, 40b and move the first and second rear support devices 50a, 50b away from them. By doing so, it becomes possible to provide the cut surface C in the haunch portion 204 with the wire saw 10 between the first and second rear support devices 50a and 50b.

Further, the first and second rear support devices 50a and 50b are fixed, the drive pulley 21 is moved along the pulley guide 22 in the direction in which the wire saw 10 is pulled into the drive unit D, and the first and second front support devices are moved. If 40a and 40b are made to freely follow the movement of the wire saw 10, it is also possible to provide the cut surface C on the haunch portion 204 by the pull cutting method.

100 cutting device 10 wire saw 20 drive mechanism 21 drive pulley 22 pulley guide 23 lifting device 24 drive unit 30 storage mechanism 31 pulley holder 32 first guide pulley 33 second guide pulley 34 third guide pulley 35 jack base 351 jack Part 352 Base part 40a First front supporting device (moving device)
40b Second front support device (moving device)
41 to 42 first and second driven pulleys 44 feeding device 45 moving body 46 pulley stand 50a first rear supporting device (moving device)
50b Second rear support device (moving device)
51 to 53 Third to fifth driven pulleys 54 Feeding device 55 Moving body 56 Pulley base 564 Feeding device 60 Running rail 61 Guide part 62 Guide support 70 Guide mechanism 71 Connecting member 72 First direction changing part 721 Horizontal pulley 722 Vertical pulley 73 second direction changer 731 horizontal pulley 732 vertical pulley 74 first guide pulley 75 second guide pulley 80 support mechanism 81 drive support beam 82 storage support beam 83 clamping fixture 84 dual-purpose support beam 85 magnet member 86 Reinforcing member 861 Vertical member 862 Diagonal member 87 Bracket 91 Clamping member 92 Through bolt 92a Nut 93 Through bolt fixture 94 Support base 95 Clamp metal fitting 200 Bridge 201 Main girder 2011 Stud with head 201a Lower flange 201b Web 202c Upper flange 202d Vertical stiffening member 202 Concrete floor slab 203 Counter tilting structure 204 Haunch (joint)
205 Horizontal structure 206 Gusset plate C Cutting plane D Drive unit F Frame

Claims (10)

A cutting device for cutting and separating a joint between a concrete floor slab and a main girder of a bridge,
a wire saw that forms a cut surface along the main girder at the joint;
a driven pulley that guides the wire saw in a direction along the cut surface;
a support mechanism detachably installed on the main girder;
a drive unit that is supported by the support mechanism and causes the wire saw to circulate;
A cutting device comprising: The cutting device according to claim 1,
A cutting device, wherein the support mechanism is installed on a lower flange of the main girder or on a lateral beam connected to the main girder. The cutting device according to claim 1,
A cutting device, wherein the support mechanism is mounted on the web of the main girder. The cutting device according to claim 1,
A cutting device, wherein said support mechanism is mounted on a vertical stiffener of said main girder. A cutting device for cutting and separating a joint between a concrete floor slab and a main girder of a bridge,
a wire saw that forms a cut surface along the main girder at the joint;
a driven pulley that guides the wire saw in a direction along the cut surface;
a support mechanism detachably installed on the counter-tilt structure or cross beam;
a drive unit that is supported by the support mechanism and causes the wire saw to circulate;
A cutting device comprising: In the cutting device according to any one of claims 1 to 5,
the drive unit
a drive mechanism comprising a drive pulley;
a storage mechanism comprising a guide pulley around which the excess length of the wire saw is wound;
and a guide mechanism including a direction changer that changes the direction in which the wire saw extends along the cut surface. The cutting device according to claim 6,
The drive unit comprises a frame detachably installed on the support mechanism,
the frame is
a columnar pulley guide provided in the drive mechanism and on which the drive pulley is installed;
a columnar pulley holder provided in the storage mechanism and on which the guide pulley is installed;
a beam-like connecting member provided in the guide mechanism, in which the direction changing portion is installed and which connects the pulley guide and the pulley holder;
A cutting device comprising: The cutting device according to claim 7,
A cutting device, wherein said frame is fixed to said support mechanism at at least three points. In the cutting device according to any one of claims 1 to 8,
A moving device that moves along the main girder under the concrete floor slab,
A cutting device, wherein the driven pulley is provided on the moving device. A method for assembling a cutting device according to any one of claims 1 to 9,
a step of installing the support mechanism on the main girder or the opposing tilting structure;
installing the drive unit on the support mechanism;
A method for assembling a cutting device, comprising:

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