JPS60483B2 - Fixing method of bearing device in cantilever construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing 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 Figure 1, the sister-in-law girder G
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 behind the bridge abutment, and then the hand-stretched garter A is attached to the bridge girder G.
be attached to the bridge pier B, and the bridge girder G is mounted on a temporary support device C, such as a steel platform, a concrete block, etc., with sliding members arranged on an appropriate support base, and the bridge girder G is directly attached to the bridge pier B. Alternatively, use the pushing device D attached to the pier B to pull (or push) the bridge girder G.
, by sliding it between the bridge girder G and the support base, or by sending the support base so as to be able to slide on a flat plate fixed to the bridge pier B etc., and make it a movable support base. A method is used in which the bridge girder G is loaded onto a platform and the supporting platform is slid by pulling (or pushing) on the flat plate using a pushing device D such as a horizontal jack to send out the bridge girder G. However, these methods have various problems.

In other words, in any of the above-mentioned methods, after the bridge girder G reaches a predetermined position and the erection, so-called delivery, 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. In addition, the work to remove the temporary support device C is carried out by lifting the bridge girder G using a vertical jack E, etc., but since the amount of lifting of the bridge girder G cannot be increased due to construction reasons, the distance between the bridge girder G and the pier B is There was a problem in that the gap between the holes was not sufficient, and as a result, the work was often done by hand, and the work was complicated and economically undesirable.

In order to solve these problems, various studies have been carried out, including bearing devices that have a movable member between the upper and lower shoes, which are generally used as bridge supports, such as rolling bearing devices where the movable member is a roller or rocker, and hinge bearings such as pins. A sliding bearing device such as a rhombus and a sliding plate or a bearing plate having a curved surface, a rubber bearing device such as rubber, or a regular bearing device that combines these are used from the beginning, and the official support device is used without using a temporary bearing device C. Erection methods have been attempted in which the support device is made to function as a temporary support device during erection, and after the erection is completed, the support device is fixed as it is to exert the desired support function. There is a problem with the method of fixing the bridge girder G and the supporting device after construction.

That is, in these methods, when the sole plate fixed to the bridge girder G and the upper shoe fixed to the pier side are fixed after construction, the upper shoe and sole plate are connected with bolts, or a sole is attached to the periphery of the upper shoe. Methods such as placing locking pieces fixed with bolts etc. on the plate and engaging and fixing it are used, but "with this fixing method, when a horizontal load is applied to the bridge girder G, The shoe and the sole plate are supported only by the bolts that engage them, and if the number or diameter of the bolts is increased, there is an inconvenience such as the size and shape of the upper shoe and sole plate must be increased. .

The present invention has been made to solve such inconveniences, and includes providing an upward recess on the upper surface of the upper shoe, and forming a downward recess on the lower surface of the sole plate that faces the upward recess of the upper shoe. A locking piece supported by a mounting bolt passing through the upper structure (bridge girder) is held in the downward recess, and after installation, the locking piece is inserted into the upward recess of the upper shoe to connect the upper shoe and sole plate. The present invention provides a method for fixing a support device in a cantilever construction method in which engagement is performed.
That is, in a method of fixing a bridge girder constructed by the cantilever construction method and a bearing device fixed to a bridge pier, the bearing device is connected to a lower shoe, an upper shoe with an upwardly directed recessed portion in the center of the upper surface, and a space between the upper and lower shoes. and a movable member arranged on the lower shoe and fixed on the pier at the lower shoe, and on the upper shoe of the support device, a downward recess facing the upward recess of the upper shoe is provided at the center of the lower surface, and the downward recess Load the bridge girder with the sole plate holding the locking piece supported by the mounting bolts fixed in a predetermined position, push out the Yoshiko girder with a pushing device to the erection position in all directions of the bridge axis, and install the bridge girder. At the same time, the upper shoe's upward recess and the sole plate's downward recess are brought into alignment, and the locking piece held in the downward recess is moved into both recesses to engage the upper shoe and the sole plate. The present invention provides a method for fixing a support device in a cantilever construction method.

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

Reference numeral 1 denotes a support device disposed between the pier B and the bridge girder G, and the support device 1' has a lower shoe 2, an upper shoe 3, and these upper and lower shoes 2,
The sole plate 5 is fixed to the bridge girder G, and a movable member 4 is disposed between the bridge girder G and eliminates displacement such as inclination and expansion/contraction of the bridge girder G. The lower shoe 2 is fixed to the pier B by an anchor bolt 6 or the like, and has a curved surface 7 on one side constituting the movable member 4 on its upper surface, and a flat surface 8 on the other side.
Convex portions 11, 11 protruding from the upper surface are formed at both ends in the direction perpendicular to the bridge axis, with the concave curved surface 10 in sliding contact with the curved surface 7 of the bearing plate 9.

The upper shoe 3 has an upwardly directed recess 13 in the center of its upper surface 12, and has locking holes 1 with the sole plate 5 at both ends in the bridge axis direction.
4 and 14, and there are also stepped portions 15 at both ends in the direction perpendicular to the bridge axis.
, 15 are provided, and the convex portions 11, 11 of the lower shoe are provided on the step portions 15, 15, leaving ears 16, 16 at both ends in the bridge axis direction.
Notches 17, 17 are formed to engage with.

Further, the upper shoe 3 has a lower surface 18 formed as a smooth surface,
The lower surface 18 is a movable part 4 which is iron-mounted on the concave curved surface 10 of the lower shoe.
The upper surface 12 is in contact with the flat surface 8 of the bearing plate constituting the bearing plate, and the upper surface 12 becomes the joint surface with the sole plate 5.

Reference numerals 19 and 19 designate hook-shaped side blocks that are fixed to the convex portions 11, 11 of the lower shoe with bolts or the like, and lock the step portions 15, 15 of the upper shoe in the vertical direction.

The sole plate 5 has an upward recess 20 for the upper shoe in the center of its lower surface, and locking holes 14 for the upper shoe at both ends in the bridge axis direction.
, 14 are provided, and a hole 23 is provided in the upper surface 22 of the bolt hole 21 to communicate with the downward recess 20 and the upper surface 22, and a nut 24 is fixed to cover the hole 23. There is.

25 is a locking piece held in the downward recess 20 of the sole plate 5, and the locking piece 25 is screwed onto the nut 24;
It is supported by a mounting bolt 26 inserted into the hole 23 with iron.

The sole plate 5 is attached to the support device 1 mounted on the pier B after the bridge girder G is erected during the manufacture of the bridge girder G.
It is fixed in advance with anchor bolts 27 or the like at a position that matches with the lower surface of the bridge girder G.

Further, the locking piece 25 is supported so as to be hugged by the downward recess 20 of the sole plate, and the locking piece 25 is
A mounting bolt 26 for locking the upper shoe 3 and the sole plate 5 by inserting it into the upward recess 13 of the upper shoe is inserted into a hole 28 provided through the lower slab G' of the bridge girder. The mounting bolts 26 are embedded and fixed by inserting the locking pieces 25 into the upwardly directed recesses 13 of the upper shoe, and then pouring mortar M or the like into the holes 28 of the bridge girder G.

29 and 29' are arranged at both ends of the support device 1 in the bridge axis direction,
This is a holding device that supports a thin steel plate 30 which is arranged so that the upper shoe 3 of the supporting device can be moved in all directions of the bridge axis, and the holding device 29 is arranged at the rear of the supporting device 1 in the feeding direction. ,
The holding devices 29' are disposed in front of the supporting device 1 in the feeding direction, and their base portions are fixed to the pier B with bolts or the like. The holding device 29 arranged at the rear of the support device 1 plays the role of sending out the thin steel plate 30 supported by being rolled or the like during erection, while the holding device 29' arranged at the front passes over the upper shoe 3. It plays a role of winding up the thin steel plate 30.

31, 31' are the pressing bars 3 of the holding devices 29, 29'.
1 and 31' have rollers 32 and 32' at their tips, and even if slight vertical displacement occurs in the bridge girder G during construction, the thin steel plate 30 is always pressed against the bridge girder G via the rollers 32 and 32'. It is something that forces you to do something.

Numerals 33 and 33 are locking members arranged between the upper and lower shoes 2 and 3, and the locking members 33 and 33 are arranged between the notches 17 and 17 of the upper shoe and the convex parts 11 and 11 of the lower shoe. and the said upper shoe 3 at the time of erection.
This restricts the movement of the bridge in the direction of the bridge axis.

To send out the bridge girder G, as shown in Figure 2, the bearing device 1
After fixing the holding devices 29, 29' for holding the thin steel plate 30 on the support device 1 and the vertical jack E for lowering the bridge girder G to the pier B, the thin steel plate 30 on the support device 1 is fixed. The bridge girder G, to which the hand-stretched garter A is attached, is manufactured on a manufacturing table provided behind the abutment.

After that, using the extrusion device D attached to the bridge girder G, the bridge girder G is sent forward along with the thin steel plate 30 on the upper shoe 3 (see Fig. 3), and also sent forward on the empty production table. Concrete is poured onto the bridge girder G, and the bridge girder G
The sole plate 5 fixed to the is fed out one after another until it reaches a predetermined support device 1, and when the sole plate 5 has reached the predetermined position, the bridge girder G is lifted up by a vertical jack E and is supported by the holding devices 29, 29'. thin steel plate 30
The vertical jack B is lowered onto the upper shoe 3 from which the upper shoe 3 has been removed, and in this state the upward concave portion 13 of the upper shoe is rotted as described above.
The locking piece 25 held in the downward recess 20 of the sole plate is attached to the mounting bolt 2 that supported the locking piece 25.
At the same time, the bolts arranged in the locking holes 14, 14 of the upper shoe are screwed into the bolt holes 21, 21 of the sole plate to engage and fix the upper shoe 3 and the sole plate 5. It is something that forces you to do something.

In addition, a locking piece 25 that engages the upper shoe 3 and the sole plate 5
is formed so that even when inserted into the upward recess 13 of the upper shoe, its upper part protrudes from the recess 13 and remains in the downward recess 20 of the sole plate, and the bolt holes 21, 21 of the upper shoe are In order to prevent horizontal loads from acting on the bolts that fix the shoe 3 and the sole plate 5, the gap between the bolt and the bolt is made larger than the gap formed by the respective recesses 13 and 20 and the locking piece 25. be.

In addition, when inserting the locking piece 25 into the upward recess 13 of the upper shoe, if the position in the direction perpendicular to the bridge axis is misaligned and the downward recess 20 of the sole plate does not match the upward recess 13 of the upper shoe, Adjustment bolts are arranged in bolt holes for fixing side blocks 19, 19 provided on convex parts 11, 11 of the lower shoes, and the position of the upper shoes is adjusted by pushing the upper shoes 3 with the bolts. .

Then, the locking members 33, 33 disposed between the upper and lower shoes 2, 3 and restraining the movement of the upper shoe 3 in the bridge axis direction, the pushing device D, the vertical jack E, and the holding devices 29, 29' are removed. , installed on the bridge girder G, with mounting bolt 2
6 is filled with mortar M or the like, and the mounting bolts 26 are buried to complete the erection (see FIGS. 4 and 5).

Here, the thin steel plate 30 at the time of sending out is arranged such that the bridge girder G is smoothly moved over the support device 1 together with the thin steel plate 30 without sliding between the bridge girder G and the thin steel plate 30. A sliding member is attached to and interposed between the sliding surfaces of the thin steel plate 30 and the upper shoe 3.

With this configuration, the load acting on the bridge girder G in the horizontal direction is transferred to the recesses 13 of the upper shoe 3 and the sole plate 5.
, 20, the load can be prevented from acting on the bolts that fix the upper shoe 3 and the sole plate 5, and the number and diameter of the bolts, as well as the upper shoe 3 and the sole The bridge girder G can be supported without increasing the size and shape of the plate 5.

In addition, each recess 13 of the upper shoe 3 and the sole plate 5
, 20, the method of inserting the locking piece 25 into the sole plate 5 is to raise the bridge girder G when the upper shoe 3 and the sole plate 5 match, and then insert the locking piece 25 into the sole plate 5. Although it is possible to explore a mode in which the locking piece 25 is inserted separately, this mode has disadvantages such as making the bridge girder G rise enough to insert the locking piece 25, which is complicated in terms of construction.

In addition, in the support device 1 of the present invention, displacement such as inclination and expansion/contraction of the bridge girder G that occurs after erection is caused by the movable member 4, that is, the curved surface 7 of the bearing plate and the concave curved surface 10 of the lower shoe, and the flat surface of the bearing plate. 8 and the lower surface 18 of the upper shoe. Furthermore, movement of the upper shoe 3 in the direction perpendicular to the bridge axis and the bridge axis after construction is restricted by the notches 17, 17 of the upper shoe and the protrusions 11, 1 of the lower shoe.
1 and each twill in the corresponding direction.

In this embodiment, the locking piece 25 held in the downward recess 20 of the sole plate is inserted into the upward recess 13 of the upper shoe.
0 and the locking piece 25, and the mounting bolt 2
6 is rotated and the downward recess 20 of the sole plate and the upward recess 13 of the upper shoe are screwed together with the locking piece 25, and a method that does not use bolts to fix the upper shoe 3 and the sole plate 5 is also adopted. It is possible. In addition, the bridge girder G is mounted on a thin steel plate 30 placed on the upper surface 12 of the upper shoe, which restrains the movement of the bridge girder G in the bridge axis direction with locking members 33, 33.
In addition, the extrusion device D attached to the bridge girder G was configured to send out the bridge girder G along with the thin steel plate 30 over the upper shoe 12, but the bridge girder G was directly pushed onto the upper shoe 3 without using the locking members 33, 33 and the thin steel plate 30. At the same time as loading G, an extrusion device D is attached directly to the upper shoe 3, and the extrusion device ○ is used to push the upper shoe 3
In other words, the upper shoe 3 loaded with the bridge girder G is pushed out by pushing out the upper shoe 3 loaded with the bridge girder G by the length of the upper shoe 3 in the bridge axis direction. The bridge girder G is sent out by pushing (or pulling) on the flat surface 8 of the bearing plate, and at that point, the bridge girder G is lifted up with a vertical jack E, and the upper shoe 3 is returned to its original position under no load. It is also possible to adopt a mode in which the operation of repeatedly lowering the bridge girder E, loading the bridge girder G onto the upper shoe 3, and pushing it out with the push-out device D is repeated. Furthermore, although a mode has been shown in which a bearing plate 9 is used for the movable member 4 disposed between the upper and lower shoes 2 and 3, a movable member 4 having a similar function without using the bearing plate 9, for example, the lower shoe 2, may be used. A pot-shaped recess is provided on the upper surface, and an intermediate plate with a rubber elastic body and a sliding part is placed in the recess, and the sliding bale between the sliding part and the upper shoe allows the bridge girder G to expand and contract, and the com elastic body A closed rubber type that eliminates displacement such as inclination by deformation, or a roller is used,
It is also possible to adopt a roller-type embodiment in which displacements such as expansion and contraction of the bridge girder G and nuisance are eliminated by the transfer of the rollers. Furthermore, the structure of the bridge girder G is box-shaped, and holes 28 are provided in the lower slab G' of the bridge girder G, which has a box-shaped cross section in order to arrange the mounting bolts 26 that support the locking pieces 25. If the cross-section does not have a box-shaped cross section, or even if the cross-section is box-shaped, a hole may be provided that penetrates to the upper surface of the cross-section, and the mounting bolt 26 may be disposed therein.

The present invention has the above configuration, and by providing a recess in the upper shoe and the sole plate and inserting a locking piece into the recess, it is possible to easily fix the bridge girder and the supporting device to be constructed using the cantilever construction method. Moreover, it has the effect of being able to sufficiently cope with horizontal loads acting on the bridge girder.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the cantilever erection method, Fig. 2 is an explanatory diagram of the cantilever erection state of the present invention, Fig. 3 is a partial vertical sectional side view of the support device when the bridge girder is sent out, The figure is a partially longitudinal side view of the support device after erection, and FIG. 5 is a partially longitudinal front view thereof. 1: Support device, 2: Lower shoe, 3: Upper shoe, 4: Movable member, 5
: Sole plate, 13: Upward recess, 20: Downward recess, 25: Locking piece, 26: Mounting bolt. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a method of fixing a bridge girder constructed using the cantilever construction method and a bearing device fixed to a bridge pier, the bearing device is installed between a lower shoe and an upper shoe with an upwardly directed recessed portion in the center of the upper surface, and between the upper and lower shoes. a movable member disposed on the support device, and fixed on the pier at the lower shoe; on the upper shoe of the support device, a downward recess facing the upward recess of the upper shoe is provided at the center of the lower surface; A bridge girder with a sole plate holding a locking piece supported by mounting bolts fixed in a predetermined position is loaded, the bridge girder is pushed out to an installation position in the bridge axis direction by a pushing device, and the upper shoe is placed at the installation position. In a cantilever construction method, the upper shoe and the sole plate are engaged by aligning the upward recess with the downward recess of the sole plate and moving the locking piece held in the downward recess into both recesses. How to fix the bearing device.