JPS607085B2 - Supporting device for cantilever erection method and cantilever erection method for bridges using the bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing device used in a cantilever construction method for a concrete bridge girder, and a cantilever construction method for a bridge using the bearing device.

Conventionally, in the cantilever construction method of concrete bridge girders,
As shown in Figure 1, when the bridge girder (superstructure) G is sent forward and erected on the pier (substructure) B, the sending out of the bridge girder G is carried out on the production table installed behind the abutment. After the concrete has hardened, hand-stretched garters A are attached to the bridge girders G, which are manufactured in units of several meters to several tens of meters, and the piers B are provided with temporary supports as shown in Figure 2. The bridge girder G is loaded onto the device C, for example, a steel platform, which consists of a sliding block D placed on a suitable support such as a concrete block, and the bridge girder G is loaded with an extrusion attached to the bridge pier B. Using device E, the bridge girder G
Either by pulling (or pushing) the bridge girder G and the support base, the support base can be slid between the bridge girder G and the support base, or the support base can be slid on the flat plate F fixed to the bridge pier B etc. as shown in Fig. 3. The bridge girder G is loaded onto the movable support stand, and the support stand is moved by pulling (or pushing) on the flat plate F using a horizontal jack. Methods such as sending out .

In particular, in this latter method, there is a limit to the movement of the movable support platform, and after a certain stroke movement, the bridge girder G is lifted up by the vertical jack W installed at the 8U end, and the support platform is returned to its original state with no load. Then, the bridge girder G is lowered again, placed on the support platform, and the movable support platform is slid.This operation is repeated to send out the bridge girder G one after another.However, these methods There is a problem.

In other words, in any of the above methods, after the bridge girder G reaches the predetermined position and the erection is completed, it is necessary to remove the temporary support device C and then install the regular support device to support the bridge girder G. , and the temporary support device C
Because the gap between the bridge girder G and the bridge pier B is small, the work to remove the bridge girder G and the bridge pier B is often done manually, and there are problems such as the work is complicated and economically unfavorable.

The present invention solves these problems by using a regular support device from the beginning without using a temporary support device D, and making the support device function as a temporary support device during erection. ``After the construction is complete, the support device is fixed in place so that it can perform the desired support function.

In other words, a bearing device that has a movable part between the upper and lower shoes, which is generally used as a bridge support, for example, has a low movable part.
A rolling bearing such as a roller or rocker, a hinge bearing such as a pin, a sliding bearing such as a sliding plate or a bearing plate having a curved surface, a rubber bearing such as rubber, or a combination of these can be applied as is. The purpose of this invention is to obtain a support device for cantilever construction method and a cantilever construction method for bridges using the support device. Between the lower shoe fixed to the pier, there is a movable part that allows displacement such as tilting of the bridge girder, or such displacement and expansion and contraction of the bridge girder. Relative movement in the bridge axis direction is regulated by the disposed locking members, and a pair of retaining devices are disposed on the pier or the lower shoe in the bridge axis direction with the lower shoe sandwiched between them. The ends of thin steel plates covering the upper surface of the upper shoe and movable in the bridge rut direction are engaged and held, and a sliding member is interposed between the thin steel plate and the upper surface of the upper shoe. , a support device for a cantilever construction method, characterized in that the bridge girder with the sole plate fixed at a predetermined position is supported on a thin steel plate so as to be movable in all directions along the bridge axis, and the support device is used. This method provides a method for cantilever erection of bridges.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

This is a bearing device placed between the Kawama pier B and the bridge girder G, and the bearing device 1 has a lower shoe 2, an upper shoe 3,
, 3, a movable part 4 which eliminates displacement such as inclination and expansion/contraction of the bridge girder G, and holding devices 6, 5' and the holding device 5 arranged at both ends of the upper and lower shoes 2, 3 in the bridge axis direction. ? 5
It is supported by a thin steel plate 6 which is supported on the upper shoe 3 and is movable in all directions along the bridge axis. The lower shoe 2 is fixed to the pier B by an anchor bolt 7 or the like, and the curved surface 8 of a bearing plate IQ, which constitutes the movable part 4 and has a curved surface 8 on one side and a flat surface 9 on the other side, slides on its upper surface. A concave curved surface 11 is formed.

The base 2 and the tortoise 2 are convex portions provided at both ends of the lower shoe 2 in the direction perpendicular to the bridge axis.

The upper shoe 3 has a curved upper surface 13 and a lower surface 14, each of which is formed as a smooth surface, and the lower surface 14 is in sliding contact with the flat surface 9 of the bearing plate that constitutes the movable part 4 which is iron-mounted on the concave curved surface 11 of the lower shoe. The upper surface 13 becomes a joint surface of a sole plate, which will be described later.

Reference numerals 15, 15 are stepped portions provided at both ends of the upper shoe 3 in the direction perpendicular to the bridge axis, and the stepped portions 15, 15 have a cutout portion 17 with ears 16, 16 left at both ends in the bridge axis direction. , 17 are formed, and the projections 12, 12 of the lower shoe engage with the notches 17, 17, and the projections 12, 12 of the lower shoe engage with the notches 17, 17.
The engagement of 2 and 12 allows the bridge girder G to expand and contract in the bridge axis direction after construction.

Reference numerals 18 and 18 designate holes for engaging sole plates provided at both ends of the upper shoe 3 in the bridge axis direction.

Reference numerals 19 and 19 designate hook-shaped side blocks that are fixed to the convex portions 12 and 12 of the upper shoe and lock the step portions 15 and 15 of the upper shoe in the vertical direction.

The holding devices 5, 5' have their base portions fixed to the pier B by bolts or the like, and the holding devices 5. is arranged at the rear of the upper and lower shoes 2 and 3 in the feeding direction, and plays the role of feeding out the thin steel plate 6 supported by the holding device 5 in a roll or the like during erection, while the holding device 5' is the feeding direction. Located in front of the direction, the upper shoe 3
It serves to wind up the thin steel plate 6 that has passed above.

20, 20' are pressing bars of the holding devices 5, 5', and the pressing levers 20, 20' have rollers 21, 2 at their tips.
1', the thin steel plate 6 is always pressed against the bridge girder G via the rollers 21, 21' during erection, and even if a small vertical displacement occurs in the girder G, the displacement is configured to handle.

22, 22 are locking members arranged between the upper and lower shoes 2 and 3;
The locking members 22, 22 are connected to the notches 17, 17 of the upper shoe 2.
and the convex parts 12, 12 of the lower shoe 3, and regulates the movement of the movable part 4 in the direction of the bridge axis during construction, in other words, the relative movement of the upper and lower shoes in all directions along the bridge axis during construction. It is something that is regulated.

23 is a sliding member interposed between the upper surface 13 of the upper shoe and the thin steel plate 6, and 24 is a holding piece that fixes and holds the sliding member 23 on the upper shoe 3. 25 is a sole plate that is buried and fixed in advance with anchor bolts 26 etc. at a position that matches the bearing device 1 which was rebuilt on the bridge pier B after the artificial material girder G was erected during the manufacture of the bridge girder G, and its lower surface is attached to the bridge girder. It is constructed on the same surface as G and has a smooth finish.

To send out the bridge girder G, as shown in Figure 4, the bearing device 1
In addition, after fixing the vertical jack 1 for lowering the bridge girder G to the top or bottom of the bridge, the thin steel plate 6 of the support device is fixed.
A bridge girder G to which a hand-stretched garter A is attached is manufactured on a production table installed behind the bridge abutment.

Thereafter, using the extrusion device E attached to the bridge girder G, the bridge girder G is sent forward along with the thin steel plate 6 on the sliding member 23 fixed to the upper shoe 3 (see FIGS. 5 and 6). In addition, on the vacant production table, concrete is poured onto the bridge girder G that has been sent forward, and the concrete is sent out one after another until the sole plate 25 fixed to the nutrient bridge girder G reaches a predetermined bearing straightness layer 1, and reaches a predetermined position. The sole plate 25 is fixed to the retaining portions 22, 22 that restrain the movable part 4 and the retaining piece 24 by launching the bridge girder G with the vertical jack 1 and disposing it between the upper and lower shoes 2 and 3. The vertical jack 1 is lowered onto the upper shoe 3 from which the thin steel plate 6 supported by the sliding member 23 and the holding devices 5 and 5' has been removed, and the cargo is loaded, and the locking hole 18 of the upper shoe is It is engaged with the upper shoe 3 by a bolt arranged at 18.

Then, the extrusion device E, vertical jack 1, and holding devices 5, 5 are removed to complete the erection (
(See Figures 7 and 8).

Here, in the thin steel plate 6 at the time of sending out, the bridge girder G is made of concrete, and the sliding member 23 is fixed to the upper surface of the upper foot 3 of the supporting device with the holding piece 24, so that the thin steel plate 6 has a low frictional resistance. It slides between the member 23 and the thin steel plate 6 and moves together with the bridge girder G.

Therefore, the vertical girder G is smoothly fed out on the support device 1 by the sliding motion of the thin steel plate 6. In addition, the thin steel plate 6 allows the protrusion to prevent the sliding member 23 from being damaged due to deformation of the thin steel plate 6 due to the protrusion caused by the bending girder G on the surface that supports the bridge girder G. It is desirable to provide a coating layer of rubber or the like, and the sliding surface of the thin steel plate 6 with the sliding member 23 is coated with a surface treatment that has antirust ability and excellent lubricity, such as plating or It is desirable to apply a solid lubricant coating or a thermoplastic resin coating such as polyamide resin or polyethylene resin, or to use fusen steel or the like for the thin steel plate 6.

Furthermore, it is preferable that the length of the thin steel plate 6 is equivalent to the bridge length of the bridge to be rolled up and supported by the holding device 5. A method such as adding and supplying pieces of length one after another is being explored.

In the supporting device 11 of the present invention, displacement such as inclination and expansion/contraction of the bridge girder G that occurs after construction is carried out by the movable part 4, that is, the sliding bale between the curved surface 8 of the bearing plate and the concave curved surface 1 of the lower shoe, and the bearing plate. It is removed by the sliding motion between the plane 9 of the upper shoe and the lower surface of the upper shoe.

In addition, ``The movement of the bridge in the direction perpendicular to the bridge axis and the bridge bridge after construction is restricted is the notch 17 on the upper shoe, the tortoise and the convex portion 129 on the lower shoe.
are regulated by their respective abutments in that direction.

In this embodiment, the supporting devices 5, 5' that support the thin steel plate 6 are
Although a mode in which the thin steel plate 6 is fixed to the pier B is shown, it is also possible to adopt a mode in which the thin steel plate 6 is fixed to the lower shoe 2 without being fixed to the pier B.
In other words, the thin steel plate 6 is automatically fed out by the friction force between the bridge girder G and the thin steel plate 6. However, a constant torque motor is installed on the holding device 5', especially on the winding side holding device 6r. It is also possible to adopt a mode in which the bridge girder G is attached to the bridge girder G and pulled out according to the distance the bridge girder G is moved.

``Even if this aspect is adopted, there will be no difference in its effects.''

In addition, after the upper shoe 3 and the sole plate are installed, the upper shoe 3 and the sole plate 26 are engaged with each other with bolts, but the sole plate 25 is also connected with a hook-shaped locking piece without using bolts. Various methods can be explored, such as fixing and engaging the sole plate 25 with the upper shoe 3 or welding the sole plate 25 and the upper shoe 3.

The supporting device base of another embodiment shown in FIG. 9 is interposed between the thin steel plate 6 and the upper shoe 3, and the sliding member 23 that slides on the thin steel plate 6 is fixed on the upper shoe 3 with a holding piece 24. This figure shows an embodiment in which the thin steel plate 61 directly slides the upper surface 13 of the upper shoe to form the coating layer 23' of the sliding member, and by adopting this embodiment, Removal of the thin steel plate 6 having the coating layer 23 after erection,
The vertical jack 1 allows the bridge girder G to be lifted without being lifted up.

That is, the lower surface of the sole plate 25 that has reached the installation position is finished smooth, and in this state it exhibits the same frictional force as the upper surface 13 of the upper shoe. The thin steel plate 6 sandwiched between them can be easily removed without causing the bridge girder G to rise.

In addition, in this embodiment, the upper surface 13 of the upper shoe is coated with a surface treatment that has rust prevention ability and excellent lubricity, such as plating, a fixed lubricant coating, or a thermoplastic resin coating such as polyamide resin L polyethylene resin. This makes it easier to remove the thin steel plate 6 each time G is fed out.

Furthermore, FIGS. 18 and 11 show an embodiment in which a separate movable part 4 having a similar function is arranged without using a bearing plate IQ for the movable part 4 constructed between the upper and lower shoes 2 and 3. It is something.

In other words, ``Figure 10 shows that the rubber elastic body 39 housed in the concave part of the lower shoe is sealed with the intermediate plate 2 fins having two sliding members on the upper surface between the upper and lower shoes 2 and 3. This figure shows an embodiment of a closed rubber bearing device comprising a movable part 4 that expands and contracts the bridge girder G by sliding with the lower surface 14 of the upper shoe and eliminates displacement such as inclination by deforming the rubber elastic body 38. In the re-drawing, a roller 31 is placed between the upper and lower shoes 298, and the upper surface of the lower shoe 2 is made smooth in the same way as the lower surface 14 of the upper shoe, and the transfer of the third roller allows for displacement such as expansion and contraction of the bridge girder and tilting. This figure shows an embodiment of a low-foot support device in which a movable part 4 is configured to remove 15 and its grandchildren.

Even with such an embodiment, the effects of the present embodiment and the same machine can be obtained.

Also in this embodiment, locking members 22 and 2 are provided between the upper and lower shoes 2 and 3 in order to restrict the movement of the movable part 4 in the bridge axis direction during construction.
2 is of course arranged, and also for the mode of the movable part base which has finally been constructed, the embodiment shown in FIG. It goes without saying that it can be made to slide with 13.

The present invention has the above-mentioned configuration, and when the bridge girder is being erected by the cantilever construction method, it functions as a temporary support device that facilitates the movement of the bridge girder, and after the erection, it remains fixed (as is) and various devices that act on the bridge girder. The support device performs the desired function of removing the load of the bridge girder and displacement such as expansion and contraction, tilting, and deflection of the bridge girder. It can be carried out without unsafe manual work, such as the installation work of a bearing device, and it improves the efficiency of erection work, and can also be applied directly to a bearing device that has a movable part between the upper and lower shoes, which is commonly used as a bridge support. It has various effects such as.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the cantilever erection method, Figs. 2 and 3 are explanatory diagrams of the conventional sending method, and Fig. 4 is a cantilever erection state of a bridge girder using the support device of the present invention. Explanatory drawings, FIG. 5 is a partially vertical side view of the support device for the cantilever construction method of the present invention at the time of sending out the bridge girder, and FIG. 6 is a partially vertical front view taken along the line J-J in FIG. , FIG. 7 is a partially vertical side view of the support device for the cantilever construction method of the present invention after erection, FIG. 8 is a partially vertical front view thereof, and FIG. 9 is a cantilever structure of another embodiment. 10 and 11 are partially vertical side views of a support device for a cantilever construction method according to still another embodiment. 1: Support device, 2: Lower shoe, 3: Upper shoe, 4; Movable part, 5,
5': Holding device, 6: Thin steel plate, 13: Top surface, 22: Locking member, 23: Sliding member, 23': Covering layer, 25: Sole plate, B: Extrusion device, 1: Vertical jack. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Scope of Claims] 1. There is a gap between the upper shoe fixed to the bridge girder and the lower shoe fixed to the bridge pier via a sole plate fixed to a predetermined position of the bridge girder. A movable part that allows displacement and expansion and contraction of the bridge girder is configured, and relative movement of the upper shoe and the lower shoe in the bridge axis direction is regulated by a locking member placed between them. A pair of holding devices are arranged on the shoe in the direction of the bridge axis, sandwiching the lower shoe, and the holding device includes an end of a thin steel plate that covers the upper surface of the upper shoe and is movable in the direction of the bridge axis. A sliding member is interposed between the thin steel plate and the upper surface of the upper shoe, and the bridge girder with the sole plate fixed at a predetermined position is loaded on the thin steel plate and moves in the axial direction of the bridge. A support device for a cantilever construction method, characterized in that it is movably supported. 2. The cantilever construction method support device according to claim 1, wherein the sliding member is fixed to the upper surface of the upper shoe by a holding piece and is interposed between the thin steel plate and the upper surface of the upper shoe. 3. The support device for a cantilever construction method according to claim 1, wherein the sliding member is integrally formed on one side of the thin steel plate and is interposed between the thin steel plate and the upper surface of the upper shoe. 4 Consisting of an upper shoe fixed to the bridge girder via a sole plate fixed to a predetermined position on the bridge girder, a lower shoe fixed to the bridge pier, and between the upper and lower shoes, it is configured to prevent displacement such as tilt of the bridge girder. Alternatively, a movable part that allows the displacement and expansion and contraction of the bridge girder, a locking member arranged between the upper and lower shoes and regulating relative movement of the upper and lower shoes in the bridge axis direction, and a locking member located on the bridge pier or the lower shoe. a pair of holding devices arranged in the direction of the bridge axis to sandwich the lower shoe, and a thin plate that covers the upper surface of the upper shoe and is arranged so as to be movable in the direction of the bridge axis, and whose ends are engaged and held by the holding devices, respectively. A support device consisting of a steel plate and a sliding member interposed between the thin steel plate and the upper surface of the upper shoe is mounted and fixed on each bridge pier, and a bridge girder is provided with the sole plate fixed in a predetermined position on the thin steel plate of the support device. Loaded, the bridge girder is slid on the upper foot of the support device together with the thin steel plate using a push-out device attached directly to the bridge pier or the bridge girder, and sent out to the construction position forward in the bridge axis direction, and the sole plate is placed on the bridge pier at the construction position. A cantilever construction method for a bridge, characterized in that the sole plate and the upper shoe are fixed together after being placed on a fixed supporting device and then removing the thin steel plate, the sliding member and the locking member. 5. Cantilever erection of a bridge according to claim 4, wherein the thin steel plate, sliding member, and locking member are removed after the bridge girder is raised by vertical jacks at the bridge girder erection position. Construction method.