JPH0765299B2 - Temporary support device for hand girder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary support device for a hand girder that temporarily supports a hand girder on the next pier in the girder forward direction when constructing a bridge girder.

[0002]

2. Description of the Related Art An extrusion method of constructing a bridge by sequentially extruding girders will be described as an example. When constructing a concrete bridge girder by the extrusion method, in order to prevent the tip of the extruded concrete bridge girder from being cantilevered, attach a hand girder to the leading end of the concrete bridge girder and attach this hand girder to the next The concrete bridge girder is moved forward while supporting the hand-held girder and girder at both ends of the span, and the bridge body is erected. In this case, before the tip of the hand girder reaches the next bridge pier in the girder advance direction, the temporary support device for the hand girder is assembled on the next pier in the girder advance direction by a separate transportation means. When the tip of the hand girder reaches, the tip of the girder is placed on this temporary support device. When the rear end of the hand girder reaches the position of this temporary support device and the tip of the concrete bridge girder is placed on the pier, remove the temporary support device on this pier.

At this time, it is necessary to support the concrete bridge girder on the pier and change the load of the temporary strut apparatus to remove the temporary strut apparatus. For this reason, it is necessary to previously incorporate a sandal jack or the like into the bottom surface of the conventional hand girder temporary support device. The above will be described with reference to the drawings. 5 is an overall side view of the hand-held girder in a state where the concrete bridge girder is pushed out, FIG. 6 is a plan view thereof, FIG. 7 is a front view thereof, and FIG. 8 is a front view of a column portion showing a conventional technique.

In FIG. 5, the hand girder 1 is attached to the head of the concrete bridge girder 2 and guides the tip of the concrete bridge girder 2 which is moving forward. FIG. 6 is a plan view of FIG. 5, and FIG. 7 shows the structure of the attachment portion of the concrete bridge girder 2 and the hand girder 1. As shown in FIG. 5, the hand girder 1 has a temporary support device 5 for the hand girder installed on the pier 3 and is supported thereon by rollers or sliding bearings.

A procedure for changing the load of the conventional temporary support device 5 will be described with reference to FIG. FIG. 8 is a view of the pier 3 as viewed from the left side of FIG. When the tip of the concrete bridge girder 2 reaches the bridge slide 4 on the pier 3, the sandle jack 6 provided on the bottom surface of the bridge slide 4 is actuated to lift the concrete bridge girder 2, The sandal jack 7 of the temporary support device 5 of the hand extending girder 1 is lowered. By this, hand delay girder 1
The temporary support device 5 does not bear the vertical load. Therefore,
The temporary support device 5 of the hand girder 1 is suspended by the chain block 8 (see FIG. 5) provided on the hand girder 1, and this is moved forward. Next, a permanent slide frame (not shown) for the concrete bridge girder 2 is mounted on the bridge pier 3, and the sandle jack 6 of the bridge slide frame 4 is lowered to place the concrete bridge girder 2 on the permanent slide frame and erected. Sliding stand for bridges for construction 4
Pull out. Next, the extrusion of the concrete bridge girder 2 is continued, and when the tip 9 of the hand-held girder 1 reaches the next pier (not shown), the tip temporary leg 10 is erected on the pier and the adjustment jack 11 raises it. Adjusting the height, the tip 9 of the hand girder 1 is supported on the pier. Next, the temporary support device 5 of the hand-reach girder 1 is advanced over the hand-reach girder 1 to reach the pier, and after being fixed on the pier, the tip temporary leg 10 is fixed using the sandle jack 7.
The load of (1) is transferred to the temporary support device 5 of the hand-rear girder 1.

[0006]

In such a conventional device, (a) it takes a great deal of time to load, remove, and carry the work of the temporary hand girder temporary support device. (B) On the pier, an upper space for installing the temporary suspension girder support device and a space for installing a slide stand for supporting the concrete bridge girder are required. For this purpose, an extra pier head is created. There must be. There was a problem.

An object of the present invention is to provide a temporary supporting device for a hand girder in which such problems are rationalized.

[0008]

The present invention relates to a device for temporarily supporting a hand girder used for bridge girder erection work on a bridge pier next to the girder forward direction. (1) The temporary support device is placed on a pedestal and on it. (2) The pedestal shall be a separate body, and (2) the pedestal shall have a downward slope toward the front of the girder forward direction on the upper surface, shall be fixed and left on the pier, and shall be the bearing part of the bridge girder. The hand girder characterized in that the part has a sliding part that slides on the pedestal and a fixing part that can be detachably fixed to the pier separately from the pedestal, and that it can be sequentially moved to the next pier. It is a temporary support device.

[0009]

In the provisional support device for the hand-retracted girder of the present invention, the pedestal and the supporting column mounted on the pedestal are separately provided, and the pedestal and the supporting column are separately fixed on the pier. This pedestal is concrete
A girder can be placed on the concrete bridge girder to finally become a slide stand for the concrete bridge girder. The pedestal and the column portion are in contact with each other at a dividing surface having a downward slope toward the front in the forward direction of the girder. The dividing surface forms a slide mount with Teflon or the like attached to the surface. The above slope of the pedestal upper surface releases the load of the hand girder supported by the stanchion when pushing out only the stanchion with the pedestal fixed on the pier, and the load was placed on the pedestal. It is for moving to the next bridge pier so that the supporting column that has released the supporting load can be smoothly extracted and moved to the next pier.

The gradient applied to the upper surface of the pedestal is the span distance,
It is determined according to the structure of the hand girder, etc., but when pushing out the strut part forward, if the strut part has a gradient amount equal to the amount of vertical compressive strain received by the load of the hand girder. , The vertical load becomes zero while the prop is pushed forward on the gantry and sliding. Therefore, in this state, the pedestal and the supporting column are separated without any shock, and the supporting column is hung on the traveling device provided on the hand girder.

When the tip of the hand girder reaches the next bridge pier and the tip is supported by the temporary tentative leg, the traveling device advances the temporary strut to the pier, mounts it on the pedestal there, and fixes it to the pier. . The top surface of the temporary column portion of the temporary supporting device for the hand-held girder of the present invention is a roller or a slide bearing for receiving the lower surface of the hand-held girder.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a side view of a temporary hand girder temporary support device according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof. FIG. 4 shows a diagram in which the support columns are extruded. The temporary support device 15 according to the embodiment includes a pedestal 16 and a support 17 mounted on the pedestal 16.
It is separated into and. The pedestal 16 has a downward slope on the upper surface toward the front of the girder forward direction. The pedestal 16 is fixed on the pier, and the support 17 can slide on the pedestal 16. The pedestal 16 also serves as the support portion (slide base 4) of the bridge girder. The bottom of the column 17 is a sliding portion 23 that slides on the pedestal 16. In addition to the pedestal 16, a fixing portion 21 that is detachably fixed to the pier is provided.

The concrete bridge girder 2 is extruded and moved forward.
FIG. 1 shows a state where the tip of the extrusion concrete bridge girder 2 has just reached the pier 3. Concrete bridge girder 2
The top end of the is placed on the pedestal 16 for the bridge. Here, the mounting bolt 22 of the fixed portion 21 is removed, and the suspension device of the temporary support device 15 is coupled to the ear portion 18 of the support column portion 17. Concrete in this state
G. When the extrusion hardware 31, 32 attached to the tip of the bridge girder 2 is brought into contact with the column 17 of the temporary support device 15 and further pushed out, the concrete bridge girder 2 is fixed to the column 17 of the temporary support device 15.
Push forward. The column 17 is placed on the pedestal 16. The upper surface of the pedestal 16 has a downward slope in the forward direction of the girder. The column 17 of the temporary support device 15 is pushed by the concrete bridge girder 2 and moves forward while eliminating the compression strain due to this downward slope. With this forward movement, the supporting loads of the temporary supporting device 15 and the concrete bridge girder are gradually rebalanced. Then, the column portion 17 of the temporary support device 15 of the hand extending girder 1 can release the vertical load. FIG. 4 shows a state in which this extrusion is in progress. That is, the concrete bridge girder 2 pushes the column portion 17 of the temporary support device 15 to the right in the figure,
The bottom surface 23 of the column 17 slides on the pedestal 16,
The vertical load is being released due to the slope above. The concrete bridge girder 2 bears this load instead. Finally, when the support 17 is pushed out from the pedestal 16, the temporary support device 15 does not support the vertical load, and the concrete bridge girder supports the pedestal 16 on the entire vertical load. Therefore,
The support 17 of the temporary support device 15 is smoothly removed from the pedestal 16 and is suspended from the hand girder 1. The vertical compressive strain amount of the temporary support device 15 varies depending on the condition and the structure, but is 3 to 4 mm.
Becomes The pedestal 16 may have a gradient having a height difference slightly larger than this strain amount, and the vertical installation accuracy is set within ± 5 mm.

[0014]

EFFECT OF THE INVENTION Since the provisional support device for the hand-retracted girder of the present invention is constructed as described above, it has the following effects. (A) Since the refilling is automatically performed, the trouble is unnecessary. (B) The top surface of the pier may be as small as necessary. (C) The bridge construction period can be shortened.

[Brief description of drawings]

FIG. 1 is a side view of a temporary hand girder temporary support device according to an embodiment of the present invention.

FIG. 2 is a front view of a temporary hand girder temporary support device according to an embodiment of the present invention.

FIG. 3 is a plan view of the temporary supporting device for the hand extending girder according to the embodiment of the present invention.

FIG. 4 is a diagram showing a case where a support column is extruded.

FIG. 5 is an overall side view of the hand extending girder.

FIG. 6 is a plan view of a hand extending girder.

FIG. 7 is a front view of a hand extending girder.

FIG. 8 is a front view of a conventional strut.

[Explanation of symbols]

1 Hand Girder 2 Concrete Bridge Girder 3 Bridge Pier 4 Frame 5 Temporary Supporting Device 6 Sandle Jack 7 Sandle Jack 8 Chain Block 9 Tip 10 Temporary Leg 11 Adjustment Jack 15 Temporary Supporting Device 16 Pedestal 17 Strut 18 Ear 21 Fixing 22 Attaching The bottom of the bolt 23

Claims (1)

[Claims] 1. A temporary support device for temporarily supporting a hand girder used for bridge girder erection work on the next bridge pier in the direction of advance of the girder, wherein the temporary support device is a separate body from a support column to be mounted thereon. The pedestal has a downward slope on the upper surface in the forward direction of the girder, and is fixed on the bridge pier and left as the bearing part of the bridge girder, and the strut part slides on the pedestal. A temporary support device for a hand girder characterized by having a fixing portion that is detachably fixed to the pier separately from the base and the pedestal.