JPS5936044B2 - Support device for cantilever erection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device used in a cantilever construction method for concrete bridge girders.

Conventionally, in the cantilever construction method for concrete bridge girders, when the bridge girder (superstructure) G is sent forward and erected on the pier (substructure) B, as shown in Fig. After the concrete has hardened, the bridge girder G is manufactured in units of several meters to several tens of meters on a manufacturing table installed at the back, and hand-stretched garters A are attached to the bridge girder G, and steel pedestals are attached to the piers B. , a temporary support device C consisting of a sliding member is placed on an appropriate support base such as a concrete block, and a bridge girder G is loaded onto the temporary support device C, either directly on the bridge girder G or on the pier B. The bridge girder can be slid between the temporary support device C using an attached push-out device, or the temporary support device C can be slid with a push-out device such as a horizontal jack. However, a method is adopted in which the bridge girders G are sequentially sent out by repeatedly sliding the temporary support device C loaded with the bridge girders G.

However, in these methods, after the bridge girder G reaches a predetermined position and the erection, so-called sending out, is completed, the temporary support device C must be removed and replaced with a regular support device, and this replacement work is required. There were problems such as the work being complicated.

In order to solve these problems, patent application No. 53-15890
In this case, a regular support device is used from the beginning without using a temporary support device C as shown in Fig. 2, and during erection, the support device is made to perform the function of a temporary support device, and after the erection is completed, the support device is replaced. We have provided an erection method that allows the structure to be fixed as is and to exhibit the desired supporting function.

That is, a vertical jack E that causes the bridge girder G to be launched and lowered in advance on the pier B, and a support F that is generally used as a bridge support and has a movable part between the top and bottom, such as a movable part force ratio or rocker. Rolling bearings and hinge bearings such as pins, sliding bearings such as sliding plates or bearing plates with curved surfaces, and bearings that combine rubber bearings such as rubber, and bearings that can be moved in the bridge axis direction on the bearing F. A supporting device K having a holding device (1) that holds and sends out the thin steel plate H placed on the support F and a holding device J that winds up the thin steel plate H that has passed over the support F is mounted and fixed.

Then, by loading the bridge girder G manufactured as a unit on the thin steel plate H on the supporting device and having the hand-stretched garter A attached thereto, and moving the bridge girder G with an extrusion device, An erection method is provided in which the thin steel plate H is sent out on the bearing F together with the thin steel plate H.

However, in this method, the thin steel plate H is rolled to a length corresponding to the entire length of the bridge and held in the holding device (2), or only a length corresponding to the distance between the piers B (spans) is rolled and held. Since the thin steel plates H are held in the device (1) and added to each span one by one during erection, there is a problem in the handling efficiency of the thin steel plates H.

The present invention was made in order to solve these problems, and instead of a holding device, a guide device having rollers and guide rollers is disposed facing each other at both ends of the support, and the guide rollers of the guide device are arranged opposite to each other. An adjustment device having a tension roller is arranged between the adjustment device and the kite device, and an endless thin steel plate is used instead of using a long thin steel plate so that the same surface always slides into contact with the upper surface of the support, and the bridge girder The present invention provides a support device for cantilever construction method which is arranged so as to move together with the cantilever construction method.

In other words, the sole play 1 is fixed to the upper structure such as the bridge girder, and the support with the movable part between the upper and lower sections is fixed to the lower structure such as the pier, and the movable part is fixed in the bridge axis direction between the -F lower shoe. A locking member for regulating the movement of the support is placed and fixed, and at both ends of the support in the bridge axis direction, a circulation roller and a circulation roller are disposed with their axes oriented in a horizontal direction perpendicular to the bridge axis. The circulating rollers support a guide device having guide rollers arranged with their axes perpendicular to each other in the direction of the bridge axis on the support side and in the horizontal direction to the axis of the bridge. The base portions are fixed to the piers so as to be sandwiched and face each other, and further, an adjustment device having a tension roller whose axis is perpendicular in the middle of the guide device is provided on the guide roller side of the guide device,
And the base part is fixed to the bridge pier at a position shifted horizontally from the bridge axis, and the guide device and adjustment device are supported by endless thin steel plates.Appeal-F is always the same. If the surface is wrapped so that it slides in contact with the upper shoe and moves in the direction of the bridge axis, the bridge girder is loaded onto the thin steel plate when the bridge girder is constructed, and the thin steel plate is circulated in sliding contact with the upper shoe. To provide a support device for a cantilever construction method, which at least enables the movement of the bridge girder and supports the bridge girder by engaging the upper shoe and sole plate after erection.

Embodiments of the present invention will now be described in detail with reference to the drawings.

1 is a lower structure B such as a bridge pier and an upper structure G such as a bridge girder.
The bearing device 1 is arranged between a bearing 2, a guide device 3, 3', and a guide device 3, 3', which are arranged opposite to each other at both ends in the bridge axis direction with the bearing 2 in between. An adjusting device 4 is located in the middle of the bridge and is disposed horizontally offset from the bridge axis, and is wound around the adjusting device 4 and guide devices 3 and 3', and is disposed on the support 2 in the bridge axis direction. It is composed of endless thin steel plates 5 that are movably arranged.

The support 2 has a sole plate 6 arranged on the bridge girder G, a lower shoe 7 arranged on the bridge girder B, and an upper shoe 8 between the lower shoe 7 and the sole plate 6 to prevent displacement such as tilting and expansion/contraction of the bridge girder G. It is composed of a movable part 9 to be removed.

The sole plate 6 is attached to the pier B after it is constructed during the manufacture of the bridge girder G.
It is embedded and fixed in the bridge girder G with its lower surface flush with the bridge girder G using anchor bolts 10, 10, etc. in advance at a position that matches the upper shoe 8 disposed on the side.

Lower shoe γ is connected to pier B by anchor bolts 11 and 11.
A concave curved surface 15 is formed on the upper surface of the bearing plate 140, which constitutes the movable portion 9 and has a curved surface 12 on one side and a lower surface 13 on the other surface, on which the curved surface 12 of a bearing plate 140 slides.

16.16 is a concave curved surface 1 at both ends of the lower shoe 7 in the direction perpendicular to the bridge axis.
These are convex portions that are provided facing each other with 5 in between.

The upper surface 17 and the lower surface 18 of the upper shoe 8 are each formed as a smooth surface, and the lower surface 18 is the flat surface 13 of the bear link plate that constitutes the movable part 9 fitted into the concave curved surface 15 of the lower shoe.
The upper surface 17 serves as a joint surface with the sole plate 6.

19. 19 is a step provided at both ends of the upper shoe 8 in the direction perpendicular to the bridge axis, and the step portions 19, 19 are provided at the convex portion 16 of the lower shoe, leaving ears 20, 20 at both ends in the bridge axis direction. .16,
In addition, notches 21 and 21 are provided to allow the bridge girder G to expand and contract in the bridge axis direction after being constructed.

Reference numerals 22 and 22 designate locking holes provided at both ends of the upper shoe 8 in the bridge axis direction for engagement with the sole plate 6.

Reference numeral 23.23 denotes a hook-shaped side block that is fixed to the convex portion 16.16 of the lower shoe and locks the step portions 19, 19 of the upper shoe in the vertical direction.

The guide devices 3, 3' have their base parts 24, 24' fixed to the pier B by bolts 25, 25, etc., and one guide device 3 is located at the rear of the support 2 in the feeding direction. The third guide device is fixed to the bridge pier B so as to be located in front of the other three guide devices in the sending-out direction, that is, to face each other with the support 2 sandwiched in the bridge axis direction.

26.26' is the guide device 3, 3v) circulation roller, and the circulation roller 26.26' is a side plate 27.27, 27' provided along the bridge axis direction on the base portion 24.24'.
, 27', with its axis oriented in a horizontal direction perpendicular to the bridge axis, and both ends thereof are rotatably and detachably supported.

28.28'H Guide rollers of the guide devices 3, 3', respectively, which guide rollers 28.28' are connected to the base part 24.
．． At 24'h, the axis of the circulation rollers 26, 26' is perpendicular to the axis of the support 2 in the direction of the bridge axis and parallel to the axis of the bridge in the horizontal direction. 24.24' is rotatably supported.

Note that the guide rollers 28.2 of the guide devices 3, 3'
8'H1 The positions of the bridges are arranged in opposite directions, and they are constructed so that they face each other on the same line in the bridge axis direction during construction.

The adjusting device 4 is placed in a horizontally offset position perpendicular to the bridge axis with respect to the bearing 2 and with respect to the guide device 3.3' by the guide rollers 28, 28 of the guide device 3,3'.
'7>N The base portion 29 is located in the middle of the opposing sides.
It is fixed to pier B with.

30.30 is a side plate of the adjustment device 4, and the side plate 30.30
are formed to protrude in parallel from the base portion 29 at regular intervals in the horizontal direction, and the side plates 30, 3 are formed on opposing surfaces.
Concave grooves 31 and 31 are provided along the protruding direction of 0.

Reference numeral 32 designates a tension roller of the adjustment device 4, and the tension roller 32 is fitted onto a roller shaft 33 so as to rotate around the shaft.
9, the coil spring 3
An adjusting piece 36 with a handle 35 is provided to adjust the pressing force of the screw 4.

The tension roller 32 has a groove 3 provided in the side plates 30, 30 with the axis of the roller shaft 33 being vertical.
1 and 31, and is configured such that tension can be applied to the thin steel plate 5 by a coil spring 34.

Here, a method for winding the endless thin steel plate 5 around the guide devices 3, 3' and the adjusting device 4 will be described.

It is desirable to move the thin steel plate 5 so that the same surface always slides on the upper surface 17 of the upper shoe of the support 2. In other words, the roughened surface that is still in contact with the lower surface of the bridge girder G slides on the upper shoe 8. In order to avoid damaging the upper surface 17 of the upper shoe,
The circulation rollers 26 and 26 of the guide devices 3 and 3' that sandwich the support 2 in the bridge axis direction are in a horizontal state, and the circulation rollers 26
．． 26' and the kite roller 28, 28' to give a twist and guide it to the side of the support 2, and wrap it around the tension roller 32 of the adjustment device 4 in a vertical state.

Note that since the surface of the thin steel plate 50 that is in contact with the lower surface of the bridge girder G slides on the tension roller 32 of the adjustment device, it is preferable to provide a coating layer of a rubber elastic body on the outer peripheral surface of the roller 32. desirable for protection.

3γ, 37 are locking members disposed between the lower shoes 7, 8 of the support, and the locking members 37, 37 are the notches 21.3 of the upper shoe.
21 and the convex portion 16.16 of the lower shoe, and restricts the movement of the movable portion 9 in the bridge axis direction during construction.

To send out the bridge girder G, after placing and fixing the bearing device 1 excluding the sole plate 6 and the vertical jack for launching or lowering the bridge girder G on the pier B in advance, it is installed on the thin steel plate 5 of the bearing device behind the abutment. It was manufactured on a production table with a hand-stretched garter attached, and the bridge girder G was loaded.
Melt.

After that, the bridge girder G is sent forward along with the thin steel plate 5 on the upper part of the support 8 using the pushing device 1 to the pushing device (FIG. 3).
(See Figure 4), and on the empty production table, concrete is poured onto the bridge girder G sent forward, until the sole plate 6 fixed in advance to the bridge girder reaches the predetermined support 8. The steel plates 5 are circulated in sliding contact and sent out one after another, and the sole plate 6 that has reached a predetermined position is attached to the bridge girder G.
The bridge girder G is lifted up with a vertical jack, and then lowered onto the upper shoe 8 of the bearing from which the locking member 37, 37 placed between the upper shoes 7 and 8 of the bearing and the thin steel plate 5 have been removed. A bolt is placed in the locking hole 22 of the upper shoe to engage it with the shoe 8.

And extrusion device, vertical jack, kite device 3,
3' and the adjustment device 4 are removed to complete the erection (see Figs. 6 and 7).

Here, the upper surface of the upper shoe 8 of the support at the time of sending out'7
A sliding member or a coating layer thereof (not shown) is interposed between the thin steel plate 5 and the thin steel plate 5 so as to ensure smooth feeding.

In the bearing device 1 of the present invention, the bridge girder G generated after erection
Displacements such as inclination and expansion/contraction are caused by the movable part 9 constructed between the lower shoes 7 and 8 of the support, that is, the curved surface 12 of the bearing plate, the concave curved surface 15 of the lower shoe, the flat surface 13 of the bearing plate, and the lower surface of the upper shoe. It is removed by each of the 18 sliding contacts.

In addition, if the bridge axis is after erection, the direction perpendicular to the bridge axis.

The movement restriction is the notches 21, 21 of the appeal and the convex part 1 of the shoe.
6.16 is regulated by contact in the respective directions.

In this embodiment, a mode in which a bearing plate 14 is used in the movable part 9 constructed between the upper and lower shoes 7 and 8 of the support is shown, but the same function as described above can be achieved without using the bearing plate 14 in the movable part 9. A separate movable part 9 having upper and lower shoes 7,
It is also possible to adopt an embodiment in which the length is set between 8 and 8.

The present invention has the above-mentioned configuration, and there is no need for unsafe manual work to replace and supply the thin steel plates used to move the bridge girder, and the erection work can be carried out smoothly and efficiently.
This provides various effects, such as the ability to apply a support that has a movable part between the upper and lower sections, which is commonly used as a bridge support, without using a temporary support device.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the cantilever construction method, Figure 2 is an explanatory diagram of the conventional cantilever construction method using thin steel plates, and Figure 3 is the cantilever construction method of the present invention when sending out the bridge girder. FIG. 4 is a front view thereof, FIG. 5 is a perspective view showing the guide device and adjustment device, and FIG. 6 is a partial longitudinal side view of the support device of the present invention after installation. FIG. 7 is a partially vertical front view thereof. 1..., bearing device, 2...... bearing, 3,3
'...Guide device, 4...Adjustment device, 5
...Thin steel plate, 6...Sole play 1.
, 7...Lower shoe, 8...Upper shoe, 9...
...Movable part, 24. 24', 29...Base portion, 26°26'...Circulation roller, 28,2
8'... Guide row 7-132... Tension roller, 37... Locking member.

Claims (1)

[Claims] 1 A sole plate is fixed in advance to an upper structure such as a bridge girder, and a support with a movable part configured between the upper and lower parts is fixed to a lower structure such as a bridge pier, and a lock is installed between the upper and lower parts to restrict the movement of the movable part in the bridge axis direction. While placing and fixing the parts,
At both ends of the support in the bridge axis direction, there is a circulation roller whose axis is arranged in a horizontal direction perpendicular to the bridge axis, and a circulation roller whose axis is in the direction of the bridge axis on the support side with respect to the axis of the circulation roller, and with respect to the bridge axis. A guide device having guide rollers arranged with their axes perpendicular to each other in parallel and offset positions in the horizontal direction is arranged with the base part fixed to the pier so that the circulation rollers face each other with the support in between. Further, in the middle of the guide device, an adjustment device having a tension roller whose axis is perpendicular is fixed to the guide roller side of the guide device, and its basic part is fixed to the pier at a position shifted horizontally with respect to the bridge axis. The guide device and the adjustment device have an endless thin steel plate wrapped around the supporting upper shoe so that the same surface is always in sliding contact with the upper shoe and moves in the bridge axis direction. By doing so, when the bridge girder is being erected, the bridge girder is loaded onto the thin steel plate, and the thin steel plate is slid and circulated on the upper shoe to enable the movement of the bridge girder, and after the bridge girder is erected, the upper shoe and sole plate are engaged. A support device for cantilever construction method that supports bridge girders.