JPH0352811Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a mobile formwork device used for manufacturing bridge girders for concrete bridges.

[Prior art]

Conventionally, in the construction of continuous girder type concrete bridges constructed using the cast-in-place concrete method and simple girder type concrete bridges with multiple spans, it is uneconomical to use formwork over the entire length of the bridge. Therefore, a method is being implemented in which the bridge is divided into several parts and constructed one after another. As a mobile formwork apparatus used in this case, a mobile formwork apparatus disclosed in Japanese Patent Publication No. 56-41763 is known.

In the case of this movable formwork device, as shown in FIGS. 13 to 15, two sets of rails 12 extending in the bridge axis direction, that is, the front and back direction, are laid and fixed on the shoring 11, and each set of rails is A support member 15 that is moved in the left-right direction, that is, in a direction perpendicular to the bridge axis, is placed on the bogie frame 22 of each bogie 13 running on the support 11 by a lateral movement jack 14, and Lifting jack 16
Two sets of left and right frames 17 with , supports a large number of small-sized formworks 20 for the upper deck section and the abdomen.

After the bridge girder concrete 21 has hardened, by shortening the lifting jacks 16 of each frame 17, the frame 1
7. Lower the left and right formwork support frames consisting of the square timbers 18 and H-shaped steel beams 19 and the formwork 20 for the upper deck section and the abdomen by their own weight, and lower the support members 15 of each truck 13. Then, each support member 15, each formwork support frame supported thereby, and the formwork 20 are laterally moved by the lateral movement jacks 14 of each trolley 13, and the formwork 20 is moved horizontally. away from concrete,
Next, the left and right carts 13 are moved to move the formwork device consisting of the formwork support frame and the formwork 20 to the next concrete pouring section.

[Problem that the invention attempts to solve]

However, in the case of the conventional mobile formwork apparatus for constructing concrete bridge girders, the upper deck formwork and the belly formwork have an integral structure, and this integrated formwork 20 as a whole is made of H-shaped steel. Since it is supported from below by a shaped steel beam 19, the H at the outer fulcrum of the beam is
Large bending forces act on the section of the steel section, which necessitates the use of H-section steel with a large cross-sectional area, and also supports the horizontal forces acting on the abdominal formwork during concrete pouring and formwork equipment movement. Since the H-shaped steel beam is not equipped with a reinforcing member, it is necessary to significantly strengthen the bending connection between the upper deck formwork support and the abdominal formwork support in the H-shaped steel beam. This increases the amount of steel used to construct the support frame, which is uneconomical. Furthermore, the weight of the formwork device increases, and the carts 13 on both the left and right sides
While simultaneously moving the support member 15 in
Since the carts 13 on both the left and right sides must run in synchronization, the work becomes complicated. Furthermore, in the case of the conventional mobile formwork apparatus for concrete bridge girder construction, it is configured to use a small-sized formwork and support it from the bottom surface with an H-shaped steel beam.
There is a problem in that it takes a long time to assemble and disassemble the formwork device.

[Purpose of the invention, structure]

The purpose of this invention is to provide a mobile formwork device for concrete bridge girder construction that can advantageously solve the above-mentioned problems. , the upper tip of the abdominal formwork 2, which has a short horizontal portion at the upper end, is rotatably connected by a pin 3 extending in the bridge axis direction, and the formwork support frame is moved up and down by a lifting jack 4. 5 above the upper deck formwork 1
is fixed, an abdominal formwork supporting jack 6 is attached to the end of the formwork support frame 5 in the direction perpendicular to the bridge axis, and the wheels 8 of the bogie 7 arranged at the bottom of the formwork support frame 5 are mounted in the direction perpendicular to the bridge axis. A mobile formwork device for constructing concrete bridge girders, which is placed on a running rail 9 that extends to the top, and has a bottom formwork 10 removably attached across the lower ends of adjacent abdominal formworks 2. be.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

Figures 1 to 12 show an embodiment of this invention, in which a section is placed on the upper surface of the prefabricated shoring 11 installed on the foundation in the direction of the bridge axis below the upper deck of the part where the bridge girder is planned to be constructed. That is, a plurality of running rails 12 extending in the front-rear direction are laid and fixed, and a plurality of wheels 8 are attached to both left and right sides of a truck frame 22 at intervals in the front-rear direction to constitute a truck 7. The wheels 8 are placed on the rails 12, and a number of lower support beams 24 extending in the left-right direction are arranged at intervals in the front-rear direction at the upper part of the bogie frame 22.
The lower support beam 24 located below is fixed to the bogie frame 22 with bolts, and the lower support beam 24 located below the upper floor slab 43 at the end
is not fixed to the truck frame 22 during concrete pouring.

Side beams 25 extending in the front-rear direction at both ends of the lower support beam 24 are connected to the lower support beam 2.
A plurality of upper support beams 26 fixed to the lower support beam 24 and extending in the front-rear direction are fixed to the lower support beam 24.
Further, the lower support beam 24 and the upper support beam 26 are connected via a vertical connection member 27 and an inclined connection member 28, and the lower support beam 24 and the side beam 25 , the upper support beam 26, the vertical connection member 27, and the inclined connection member 28 constitute the steel formwork support frame 5.

The large steel upper deck formwork 1 is constructed by fixing a large number of steel reinforcing ribs 30 extending in the left-right direction and steel reinforcing ribs 31 extending in the front-rear direction to a steel face plate 29, and each upper support beam 26 and fixed with bolts, a steel face plate 32 consisting of a short upper horizontal plate and a long vertical plate has steel reinforcing ribs 33 extending in the vertical direction and steel reinforcing ribs 34 extending in the front-rear direction. A steel abdominal formwork 2 is constructed by being fixed, and a bracket 35 is fixed to the upper end of the abdominal formwork 2, and a bracket 36 is fixed to the end of the upper deck formwork 1 on the bridge girder abdomen side. A pin 3 extending in the front-rear direction is inserted through the pin 3, and the end of the abdominal form 2 is rotatably connected to the end of the upper slab form 1 by the pin 3.

At both left and right ends of the lower part of the formwork support frame 5,
A plurality of lifting jacks 4, which are screw jacks with rotating handles, are arranged and fixed at intervals in the front-rear direction, and at the bottom of the formwork support frame 5 below the intermediate upper floor slab. A lifting jack 4 is fixed to the upper part of each rail 12, and a plurality of abdomens are provided at both left and right ends of the formwork support frame 5, each consisting of a screw-type jack that extends in the left-right direction and is equipped with a rotation handle. Formwork supporting jacks 6 are fixed at intervals in the front-rear direction.

A plurality of connecting arm insertion holes 3 are provided at the bottom of the abdominal formwork 2.
A plurality of connecting arms 39 having wedge holes 38 are fixed to both left and right ends of the steel bottom formwork 10, which is arranged between the lower ends of adjacent abdominal formworks 2. 2 and the end of the bottom formwork 10, the connecting arm 39 connects the lower end of the abdomen formwork 2.
After the connecting arm is inserted through the connecting arm insertion through hole 37, the tightening wedge 40 is inserted into the wedge hole 38 and driven.

FIG. 1 shows a state in which concrete 21 for a bridge girder is placed, in which a bottom form 10 is placed across the lower ends of adjacent belly forms 2 and fixed by the tightening wedges 40. , and the abdominal formwork 2 is supported by the extended abdominal formwork supporting jacks 6 via the square timbers 41, and the lifting jacks 4 are further extended to form the upper slab formwork 1 and the bottom formwork 10.
is placed at a predetermined level, the wheels 8 of the trolley 7 below the middle upper deck 42 are lifted off the rails 12, and the formwork support frame 5 below the upper deck 43 at the end is lifted off the trolley frame 22. The bridge girder concrete 21 is placed on top of each formwork in this state.

After the bridge girder concrete 21 has hardened,
As shown in FIG. 2, the tightening wedge 40 is pulled out to release the connection between the abdominal formwork 2 and the bottom formwork 10, and then the abdominal formwork supporting jacks 6 are shortened and the abdominal formwork 2 is removed. It is rotated about the pin 3, and then the lifting jack 4 is shortened to lower the formwork support frame 5 and the parts supported by it, and the upper slab formwork 1 and the abdominal formwork 2 are removed. While being molded, the wheels 8 of the trolley 7 below the intermediate upper deck are placed on the rails 12, and the formwork support frame 5 below the upper deck 43 at the end is placed on the truck frame 22. and is fixed with bolts 44. The formwork support frame 5 supporting the demolded upper deck formwork 1 and belly formwork 2 is moved to the next bridge girder concrete construction section while being placed on a trolley 7, and each part is again The bridge girder concrete 21 is placed in the state shown in FIG. 1.

When implementing this idea, the formwork support frame 5 below the intermediate top slab 42 may be separated from the trolley frame 22 during concrete pouring and raised, and the formwork support frame 5 below the top slab 43 at the end may be lifted up. It is also possible to fix the formwork support frame 5 on the trolley frame 22 so that the trolley 7 is lifted off the rail 12 during concrete pouring. Furthermore, a hydraulic jack may be used as the lifting jack 4 and the abdominal formwork supporting jack 6.

[Effect of idea]

According to this invention, the upper tip of the abdominal formwork 2, which has a short horizontal portion at the upper end, is rotatably connected to the end of the upper deck formwork 1 by a pin 3 extending in the bridge axis direction. The upper deck formwork 1 is fixed to the upper part of a formwork support frame 5 which is moved up and down by a lifting jack 4, and an abdominal formwork supporting jack is attached to the end of the formwork support frame 5 in the direction perpendicular to the bridge axis. 6 is attached, and the bottom formwork 10 is removably attached across the lower ends of the adjacent abdominal formworks 2. Therefore, after the bridge girder concrete 21 has hardened, simply connect the abdominal formwork 2 and the bottom formwork. 10 and shorten the abdominal formwork supporting jacks 6 to rotate the abdominal formwork 2 around the pins 3, and further shorten the lifting jacks 4 to form the formwork support frame 5. By performing the simple work of lowering each part supported thereby, the belly formwork 2 and the upper deck formwork 1 can be easily demolded and moved to the next bridge girder concrete construction section by the trolley 7. Therefore, the work can be simplified, the work time can be shortened, and the construction efficiency can be improved. In addition, since no bending force is applied to the joint between the upper deck formwork 1 and the abdomen formwork 2, there is no need to reinforce the joint with a reinforcing member having a large cross section, and the joint is located in a plane perpendicular to the bridge axis. There is no need to use a large number of steel beams, so the amount of steel that makes up the formwork support frame can be reduced, making it economical.It also reduces the weight of the formwork equipment and improves mobile workability. Effects such as being able to do this can be obtained.

[Brief explanation of drawings]

Figures 1 to 12 show one embodiment of this invention, and Figure 1 is a vertical sectional front view showing concrete for a bridge girder being poured using the mobile formwork device of this invention; Figure 2 is a longitudinal front view showing the state of the formwork when it is moved after concrete has hardened, Figure 3 is a longitudinal front view showing the rotatable connection between the upper deck formwork and the abdominal formwork, and Figure 4 is Its bottom view, FIG. 5 is a longitudinal sectional front view showing a joint between the abdominal form and the bottom form, and FIG. 6 is its side view. Figure 7 is a side view showing the relationship between the lifting jack, rail, and truck during concrete pouring, and Figure 8 is a side view showing the relationship between the lifting jack, rail, and truck when moving the mobile formwork device. , Figure 9 is A- in Figure 8.
A sectional view taken along line A, FIG. 10 is a longitudinal sectional front view of the lifting jack attached to the trolley, FIG. 11 is a side view thereof, and FIG. 12 is a part showing how the abdominal formwork is supported by the jack for supporting the abdominal formwork. FIG. Fig. 13 is a longitudinal sectional front view showing concrete being poured using a conventional movable formwork device for constructing concrete bridge girders, Fig. 14 is a front view showing a partially enlarged view, and Fig. 15 is a FIG. 14 is a longitudinal sectional front view showing a state when the movable formwork device shown in FIG. 13 is moved. In the figure, 1 is the upper slab formwork, 2 is the abdominal formwork,
3 is a pin, 4 is a lifting jack, 5 is a formwork support frame, 6 is a jack for supporting the abdominal formwork, 7 is a trolley, 8 is a wheel, 9 is a running rail, 10 is a bottom formwork, and 11 is a support. , 12 is a rail, 21 is concrete for a bridge girder, 22 is a bogie frame, 26 is an upper support beam, 29 is a steel face plate, 30 and 31 are steel reinforcing ribs, 32 is a steel face plate, 33 and 34
39 is a connecting arm, and 40 is a tightening wedge.

Claims (1)

[Scope of utility model registration request] The upper end of the abdominal formwork 2, which has a short horizontal portion at the upper end, is rotatably connected to the end of the upper deck formwork 1 by a pin 3 extending in the bridge axis direction, and a lifting jack 4 The upper deck formwork 1 is fixed to the upper part of the formwork support frame 5 which is moved up and down by
An abdominal formwork supporting jack 6 is attached to the end of the formwork support frame 5 in the direction perpendicular to the bridge axis,
Wheels 8 of a bogie 7 arranged at the lower part of the formwork support frame 5 are placed on running rails 9 extending in the bridge axis direction, and the bottom formwork 10 is attached and removed across the lower ends of the adjacent abdominal formworks 2. A mobile formwork device for constructing concrete bridge girders, which is characterized by being freely installed.