KR200231051Y1 - inner formwork for pre-stressed bridge box girder - Google Patents

Abstract

According to the present invention, in accordance with the box girder standard of one span, the upper panel is fixedly installed in the center thrust support frame which is moved in the longitudinal direction by the wheel, and is installed foldingly between the left and right panels and the upper panel and the left and right panels. In the prefabricated movable formwork having left and right connecting panels and left and right anchor block panels, each of which can be folded at a certain distance by several hydraulic cylinders and joint blocks,

The left and right connecting panels are supported by the hinges at the left and right ends of the upper panel so as to be folded downward, and the other end is connected to the upper ends of the left and right panels and the hook-type fixing means, and these left and right connecting panels are respectively separated from the left and right panels. It is connected to the cylinder so that the bottom of the left and right anchor block panels, respectively forming a lower portion of the anchor block, the upper end is connected to the lower end of the left and right anchor block panel hinged and the bottom is folded inward left and right anchor block panels It is characterized by providing a movable internal formwork for box girder construction of prestressed concrete bridges having an auxiliary panel connected to the inside of the bottom of the turn buckle.

Description

Inner formwork for pre-stressed bridge box girder

The present invention relates to a movable internal formwork for box girder construction of pre-stressed concrete bridge.

Among the methods of constructing the box girder of the prestressed concrete bridge, the concrete is produced by placing concrete while launching the scaffold at the top of the pier.Inframental launching method, F.S. (full staying method) There are various mobile construction methods such as free cantilever method and MS (movable scaffoling system).

These mobile construction methods install launching scaffolding at the top of pre-made bridges and construct the entire bridge in a connected form while constructing the box girders at intervals, and the inner form of the box girders is formed in a predetermined form. Formwork is essential.

The internal formwork as described above is formed in a fixed type and a movable type according to the configuration and usage method, the fixed type is a configuration in which the upper and left and right panels are assembled and fixed in accordance with the internal shape of the box girder by using the pedestal, After the concrete casting, each panel is demolded from the box girder formed by dismantling method, and then the formwork material dismantled in the next span is reassembled and used.

The movable type is fixed to the box girder standard of one span, and the upper panel is fixedly installed on the center thrust support frame which is moved in the longitudinal direction by the wheel, and the left and right panels and the left and right panels are folded between the upper panel and the left and right panels. The connecting panels are prefabricated formwork that can be folded at a certain distance by several hydraulic cylinders.The concrete dimensions of the formwork are reduced by folding the left and right panels and the left and right connecting panels to the center trust supporting frame, respectively, after placing concrete. After moving, move to the next span and use it.

Among the above-mentioned configurations, the movable internal formwork is widely used in comparison with the stationary type, and has high construction precision, and the effect of shortening the air, reducing labor costs and overall construction cost due to assembly and demolding. In the folding configuration is not precise and practical, there is a problem that the air shortening effect during assembly and demolding work is very weak and low precision.

In particular, the box girder of most prestressed concrete bridges is configured to control the tension of PC strands during curing or use, and is used for fixing the PC strands located on the left and right sides of the piers in one span on the inner wall of the box girder. Concrete anchor block is installed by projecting to a certain standard.

The protruding PC strand anchor anchor block is concretely integrated with the box girder or dozens of connecting pipes for connecting the reinforcing bar and the PC strand in accordance with the position where the anchor block is to be installed on the inner wall of the box girder. In one state, the inner wall of the box girder is first placed in a flat state to be cured, and secondly, the anchor block is reinforced by connecting the reinforcing bar and the PC strand to the connection pipe, and then the anchor block is constructed by connecting the concrete by placing it.

Therefore, according to the construction method of placing the anchor block in a separate process, since there is no anchor block protruding from the inner wall of the box girder formed by the primary concrete placing, the movable internal formwork used in this construction method has a short folding operation for assembly and demoulding. Even if the configuration is simple, there is practicality.

In other words, the folding configuration of the movable internal formwork mainly consists of the left and right panels and the hydraulic device for folding the left and right connecting panels installed between the left and right panels and the upper panel, and in the absence of an anchor block on the inner wall of the box girder. Since the external dimensions of the movable internal formwork demolding from the box girder need only be reduced to the extent that it is moved to the next span inside the box girder, the configuration of the hydraulic system for folding the left and right panels and the left and right connecting panels is to use a short operation stroke. This can be done with a simple configuration.

However, the movable internal formwork used in the construction method in which the concrete anchor block for fixing the PC strand is fixed to the inner wall of the box girder is used to fold the movable internal formwork in a folding manner to move to the next span. Since the left and right panels that were installed should be folded by the width of the cured anchor block, the folding configuration is complicated.

Theoretically, it is possible to increase the folding stroke by replacing the hydraulic cylinders supporting and folding the left and right panels with a long operating stroke, but the folding stroke of the left and right panels is performed in association with the folding stroke of the left and right connecting panels. It cannot be solved by replacing only hydraulic cylinders with long operating strokes.

Recently, the movable internal formwork device used in the integrated anchor block construction method is a configuration in which the left and right panels and the left and right connecting panels are connected to each other by one hydraulic cylinder, and according to this configuration, the hydraulic cylinder Although there is an economical advantage to reduce the number of installations, the fixing accuracy of the left and right panels and the left and right connecting panels is lowered, resulting in a poor construction in the concrete specification of the box girder, which should be installed with an error accuracy within 1/100, and replacement of the hydraulic cylinder. Increasing the working time in the internal formwork has the disadvantage of increasing the setting and dismantling, folding time.

The present invention is provided to solve the problems of the movable internal formwork for the construction of the box girders of the conventional prestressed bridge as described above, the left and right panels and left and right connections in forming the movable internal formwork used in the anchor block integrated construction box girder. The purpose of the present invention is to provide a practical movable internal formwork with high construction accuracy, high assembly precision, high air shortening due to assembly and demolding, and low labor cost, by forming the operation units of the panels separately and improving the folding configuration of the left and right connecting panels.

Figure 1 is a side configuration of a portion of an embodiment movable internal formwork of the present invention

2 is a cross-sectional view of the fixing state of the configuration for the box girder flat side wall of the embodiment of the present invention movable internal formwork

3 is a partially enlarged cross-sectional view of the fixing state of the configuration for the box girder plane side wall of the configuration of the movable internal formwork according to one embodiment of the present invention

Figure 4 is a half-sectional view of the demolded state of the configuration for the box girder plane side wall of the configuration of the movable internal formwork of one embodiment of the present invention

Figure 5 is a cross-sectional view of the fixing state of the configuration for the box girder anchor block of the configuration of the movable internal formwork of one embodiment of the present invention

Figure 6 is an enlarged cross-sectional view of a part of the fixing state of the configuration for the box girder anchor block of the structure of an internal formwork movable one embodiment of the present invention

Figure 7 is a cross-sectional view of the demold state of the configuration for the box girder anchor block of the configuration of the movable internal formwork of one embodiment of the present invention

8 is an enlarged cross-sectional view of one side of the connecting panel part of the configuration for the box girder anchor block configuration of a movable internal formwork of an embodiment of the present invention

Figure 9 is an enlarged cross-sectional view of the fixing state of one side of the auxiliary panel portion of the configuration for the box girder anchor block of the configuration of the movable internal formwork of one embodiment of the present invention

10 is an enlarged cross-sectional view of one side of the auxiliary panel portion of the configuration for the box girder anchor block configuration of the movable formwork inside an embodiment of the present invention

Figure 11 is a side configuration diagram of a connecting panel of the embodiment of the present invention movable internal formwork

12 is a cross-sectional view of the main part of the connection panel of the embodiment of the present invention movable formwork

Figure 13 is a side configuration view of the fixing piece formed on the upper left and right panels of the configuration of an embodiment movable internal formwork of the present invention

Figure 14 is a sectional view of the main portion of the fixing piece formed on the upper left and right panels of the configuration of an embodiment movable internal formwork of the present invention

Figure 15 is a side view of the support roller portion of the left and right panel movable support formed on the middle frame of the thrust support frame of the movable formwork of an embodiment of the present invention

Figure 16 is a cross-sectional view of the support structure of the movable support for the left and right panels in the middle frame of the thrust support frame of the mobile formwork form one embodiment of the present invention

<Description of the symbols for the main parts of the drawings>

B: Box girder Ba: Box girder upper Bs: Box girder lower

Ab: Anchor Block Td: Strand

10a: Lower frame 10b: Vertical frame 10c: Middle frame 10d: Upper frame

11: wheel 12: hydraulic jack 13, 13a: hydraulic cylinder 14, 14a ,: turn buckle

15: Hydraulic cylinder for the left and right connection panel 15a: the operating rod of the hydraulic cylinder (15)

16: Turn buckle 18 for subpanel 18: Wheel rail 20: Upper panel

20a: Outer plate 20b: Extension outer plate 21: Horizontal frame of the upper panel

30: Left and right panel 30a: Upper outer plate of left and right panel

30b: Side outer plate of the left and right panels 30c: Upper horizontal frame

31: H type upper frame 31a: fixing piece 33: semi-arc shaped fixing groove

34: Slope 35: Settlement hole 36: Reinforcement

40: Left and right anchor block panel 40a: Anchor block panel upper outer plate

40b: Anchor block panel side outer plate 40c: Anchor block panel upper horizontal frame

40d: Anchor block panel frame 41: Anchor block panel upper frame 41a: Mounting piece

42: Anchor block panel side frame 43: Semi-arc anchorage groove

44: Slope 45: Settling hole 46: Bracket 47: Bracket

50: left and right connection panel 50a: fixed outer plate 50b: assembled outer plate

50c: Horizontal frame 51: H-shaped frame 51a of connecting panel: Insert

52: fixing rod 53: insertion hole 54; fixing pin 55: hinge 56: bracket

60: subpanel 62: upper hinge plate 63: lower hinge plate

70, 70a: left and right moving support 71: slide pad 72: support roller

73: stopper

The configuration of the movable internal formwork of the present invention for achieving the above object,

In accordance with the box girder standard of one span, the upper panel is fixedly installed in the center thrust support frame that is moved in the longitudinal direction by the wheel, and the left and right side panels and the left and right connecting panels that are folded between the upper panel and the left and right panels. In the prefabricated movable formwork, which is provided with the left and right anchor block panels, each of which can be folded at a certain distance by several hydraulic cylinders and joint blocks,

The left and right connecting panels are supported by the hinges at the left and right ends of the upper panel so as to be folded downward, and the other end is connected to the upper ends of the left and right panels and the hook-type fixing means, and these left and right connecting panels are respectively separated from the left and right panels. It is connected to the cylinder so that the bottom of the left and right anchor block panels, respectively forming a lower portion of the anchor block, the upper end is connected to the lower end of the left and right anchor block panel hinged and the bottom is folded inward left and right anchor block panels Characterized in that it comprises a sub-panel connected to the inner side of the turn buckle.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 to 16 is a configuration and use state diagram of an exemplary embodiment of the present invention used for the anchor block integrally constructed box girder among the configurations of the movable internal formwork for the box girder construction of an example prestressed bridge. .

The basic configuration of an embodiment of the present invention movable internal formwork, according to the box girder (B) standard to be constructed in one span,

Several wheels 11 are installed at the lower end of the lower frame 10a so that they can be moved in the longitudinal direction, and the lower frame 10a is pre-cured by the hydraulic jack 12 at the time of fixation. Supported by the center of the upper surface of the bottom, and the support frame formed in a trust type by a plurality of vertical frame (10b) and the intermediate frame (10c) and the upper frame (10d) to the top of the lower frame (10a),

An upper panel 20 fixedly installed to support a part of the slab surface of the box girder upper mold Ba to be molded at the upper end of the upper frame 10d of the trust type support frame;

The left and right moving support 70 is horizontally controlled to move horizontally controlled by the hydraulic cylinder 13 is supported freely to move to the left and right ends in the trust frame intermediate frame (10c), the middle is supported freely hinged and the bottom The left and right panels 30 are folded and supported at the side ends of the lower frame 10a by the turn buckle 14 to form upper and lower side walls of the box girder B, and

In the same structure as the left and right panels 30 in the trust frame intermediate frame (10c) is supported by the left and right moving support (70a) and the turn buckle (14a) horizontally controlled to move horizontally by the hydraulic cylinder (13a) box And the left and right anchor block panels 40 for forming the anchor block (Ab) formed in a narrow width on a part of the left and right inner wall of the girder (B),

Between the upper panel 20 and the left and right panels 30, the left and right connection panels 50 of the folding type is supported by one hinge at the left and right ends of the upper panel 20 so as to be folded downward. In terms of the configuration is the same as the basic configuration of a conventional movable internal formwork.

One feature of an embodiment movable internal formwork of the present invention having the basic configuration described above,

Between the upper panel 20 and the left and right panels 30 and between the upper panel 20 and the left and right anchor block panels 40, one side hinges 55 at the left and right ends of the upper panel 20, respectively. The folding fixing configuration of the left and right connecting panels 50 are supported by the folding downward.

The folding fixing configuration of the left and right connection panels 50 is a semi-arc shaped fixing groove open to the lower end at the front end of the upper frame 31 supporting the upper outer plate 30a of the left and right panel 30 ( 33 and the inclined end 34 is formed, and the fixing piece 31a having the fixing hole 35 penetrated with the reinforcing table 36 to the left and right above the fixing groove 33 is formed.

In addition, in the same configuration, the semi-circular fixing groove 43 and the inclined end 44 of which are opened at the lower end of the upper frame 41 supporting the upper outer plate 40a of the left and right anchor block panels 40 at the lower end thereof. ) Is formed, and the fixing piece (41a) is formed on the upper side of the fixing groove 43 has a reinforcing bar 36 to the left and right, and the fixing hole 45 is formed therethrough.

The configuration of the left and right connection panel 50, the folding end of the connection panel 50 is fixed to the fixing pieces (31a) (41a) is formed,

An insertion piece 51a overlapping the fixing pieces 31a and 41a to the outside of the reinforcing rods 36 is formed at the front end portion of the H-shaped frame 51 of the left and right connecting panels 50, and the insertion piece 51a is formed. At the bottom of the) is formed by fixing the fixing rod 52 pivotally fixed to the semi-circular arc-shaped fixing groove (33, 43), the upper end of the alignment hole (35) and (45) integrally aligned By forming the insertion hole 53 for fixing the fixing pins 54 in a fixed state, the left and right panels 30 and the left and right anchor block panels 40 are formed in the same shape, but different left and right specifications.

The folding left and right connection panels 50 of this configuration are provided with a bracket 56 on the lower surface of the H-type frame 51, so that the main body of the hydraulic cylinder 15 is supported by the intermediate frame 10c of the trust type support frame. It is a structure which connects the operation rod 15a by hinge type.

On the other hand, the configuration of the inner formwork outer plate of the portion in which the folding connection panel 50 is installed, the outer plate of the connection panel 50 has two horizontal frame 50c the upper horizontal frame 30c of the left and right panels 30 ) And a width narrower than the space between the horizontal frame 21 on one side of the upper panel 20, and the horizontal frame 21 on the upper horizontal frame 40c and the upper panel 20 of the left and right anchor block panels 40. Installed at the upper end of the connection panel frame 51 with a width narrower than the space between the two and fixing the fixed outer plate 50a thereon,

The upper outer plate 30a of the left and right panels 30 and the upper outer plate 40a of the left and right anchor block panels 40 are upper horizontal frames 30c installed on the upper ends of the respective H type upper frames 31 and 41. In the upper end of the 40c) to the middle only,

The outer side plate 20a of the upper panel 20 is the structure which extended the outer side plate 20b extended to the position which abuts on the fixed outer side plate 50a of the left and right connection panel 50 in each of the left and right sides.

The upper outer plate of the fixed outer plate 50a and the left and right panels 30 and the left and right anchor block panels 40 of the connecting panel 50 generated when the left and right connecting panels 50 are assembled and fixed by the configuration of the form outer plates as described above. The space between the 30a and 40a is formed to have a prefabricated outer plate 50b for each space as a separate member to be fixed and fixed with a fixing piece or a bowl at the time of fixing.

Another embodiment of the present invention the movable internal formwork,

The auxiliary panel 60 is provided at the lower ends of the folding left and right anchor block panels 40 which are installed to form the anchor blocks Ab on the left and right inner walls of the box girders B at the left and right ends of the thrust-type support frame. .

The auxiliary panel 60 has a standard for forming a part of the lower end of the anchor block (Ab), the upper and lower anchor block panel outer plate 40b and the anchor block panel side frame 42 at the lower left and right of the anchor block panel 40 ) Is provided with an upper hinge plate (62) hinged to the bracket 46 installed between the bottom, protruding lower hinge plate (63) is attached to the lower end of the frame (40d) of the left and right anchor block panel (40) It is a configuration that is installed in a folding manner by the turn buckle 16 between the bracket 47 attached to the.

Another embodiment of the present invention the movable internal formwork is

Intermediate frame (10c) to the support means of the left and right moving support (70) (70a) for supporting the left and right panels 30 and the left and right anchor block panels (40) at the left and right ends of the trust frame intermediate frame (10c). The inner wall of the slide pad 71 is installed and the lower support rollers 72 are installed on the lower side to facilitate the folding operation of the left and right moving support 70 (70a).

In the figure, reference numeral 18 denotes a wheel 11 driving rail installed to launch the movable internal formwork to the next span, reference numeral 73 denotes a stopper that prevents the left and right panels 30 from falling when demolded, and reference symbol Td It is shown.

One embodiment of such a configuration the use state of the movable internal formwork is as follows.

For the construction of prestressed concrete bridges, a mobile scaffolding device is installed at the top of the first pier for the pre-construction piers, and when one span lower mold Bs of the box girder is poured, the upper form of the box girder B In order to place Ba), the external formwork of the mobile scaffolding device is installed, and after the reinforcement of the reinforcing bar and the strand Td on the sidewall of the box girder B is performed, the movable internal formwork is installed therein.

At the time of initial installation of the movable internal formwork, it is temporarily assembled on the upper surface of the lower mold Bs cured in the disassembled state.

The movable internal formwork assembled with the first is fixed by adjusting the height of the upper panel 20 by supporting the lower frame 10a with several hydraulic jacks 12 so that the wheels 11 are lifted a certain height from the upper surface of the lower mold Bs. Let's do it.

Then, the left and right panels 30 and the left and right anchor block panels 40 are assembled and fixed to a predetermined standard by using the hydraulic cylinders 13 and 13a and the turn buckle 14 and 14a.

Subsequently, the auxiliary panel 60 provided at the lower end of the left and right anchor block panels 40 is fixed to a predetermined standard using the turn buckle 16.

Finally, the hydraulic cylinder 15 is connected to the left and right connecting panels 50 between the upper end of the fixed upper panel 20 and the left and right panels 30 and the space portion of the upper panel 20 and the left and right anchor block panels 40. If you raise it up,

A fixing rod 52 is formed in the upper frames 31 and 41 of the left and right panels 30 and the left and right anchor block panels 40 as the insertion plate 51a, which is a folded end of the left and right connecting panels 50, is raised. Close to the pieces 31a and 41a, they are first contacted with the inclined ends 34 and 44 and seated in the semi-arc shaped fixing grooves 33 and 43 while being guided upward.

When the insertion plate 51a overlaps and rests on the fixing pieces 31a and 41a, the fixing pins 54 pass through the fixing holes 35 and 45 and the insertion holes 53 to be completely fixed. .

When the fixing operation of the left and right connection panels 50 is completed, as described above, the assembled outer plate 50b formed of a separate member is fixed to the outer plate 50a of the connection panel 50 and the upper outside of the left and right panels 30. The space between the plate 30a and the space between the fixed outer plate 50a of the left and right connecting panels 50 and the upper outer plate 40a of the left and right anchor block panels 40 are assembled by fixing pieces or the like. To complete the setting of the overall internal formwork.

When the setting of the movable internal formwork as described above is completed, concrete reinforcement work is performed after reinforcing the reinforcing bars and the strands again.

If the curing work is carried out after concrete for a certain period of time, demolding the movable internal formwork, the demolding work is carried out as follows.

The demolding operation of the movable inner formwork is performed by first removing the fixing piece of the prefabricated outer plate 50b, which is prefabricated to the upper end of the prefabricated connecting panel 50, and then fixing holes 35 and 45 and the insertion hole 53 ( The fixing pin 54 inserted in the 53 is removed, and then the hydraulic cylinder 15 is operatively controlled to the inlet side, and the insertion plates 51a of the left and right connecting panels 50 are pulled downward to fully fold inwards.

Subsequently, the auxiliary panel 60 installed at the lower end of the left and right anchor block panels 40 is lifted inward by using the turn buckle 16 to be folded.

Subsequently, the turn buckles 14 and 14a installed at the lower ends of the left and right panels 30 and the left and right anchor block panels 40 are completely removed, and then the hydraulic cylinders 13 and 13a are operated to be pulled in and to the left and right sides. The panel 30 and the left and right anchor block panels 40 are folded by horizontally moving inwards stepwise, respectively.

At this time, the left and right panels 30 and the left and right anchor block panels 40 are fully folded to a position that does not interfere with the inner end of the anchor block Ab of the molded box girder B.

Subsequently, by lowering the several hydraulic jacks 12 supporting the lower frame 10a of the trust-type support frame from the upper surface of the lower mold Bs, demolding the upper panel 20 while lowering the entire trust-type support frame, the lower frame 10a The wheels 11 installed at the bottom of the) are seated on the rails 18 installed for launching on the upper surface of the lower mold Bs, and the overall demolding operation is completed.

When the demolding operation of the movable internal formwork is completed as described above, the rail 18 is moved to the upper surface of the lower mold Bs of the box girder B which is pre-poured in the pier of the next span, and then assembled and assembled in the same way in the next span. Used for demolding work.

According to one embodiment of the present invention as described in the configuration and use state of the movable internal formwork according to the movable internal formwork of the present invention, by folding a certain space between the left and right panels and the upper panel and between the anchor block panel and the upper panel In forming a movable internal formwork for installing the connection panel, the folding connection panels are operated and controlled by an independent hydraulic cylinder, and the mounting structure is hooked up, and the upper outer plate of the left and right panels, the outer plate of the upper panel, and the left and right sides By improving the outer panel of the connecting panel and having a prefabricated outer plate as a separate member, the fixing and demolding of the outer panel of the connecting panels can be performed quickly, smoothly and with high precision, and at the bottom of the anchor block panel. An angle having to be molded up to the upper surface of both ends of the lower mold Bs of the box girder B with the overlapping auxiliary panel Although it is easy to form the Kerb block (Ab), the installation cost is increased by increasing the number of installation of the hydraulic cylinders compared to the conventional mobile internal formwork used in the anchor block integrated construction method, but the improvement of the process process density and assembly And it is to have the advantage that the reduction in air, and the labor cost reduction according to the demoulding, moving significantly.

The present invention as described above is not necessarily limited to the above embodiment, some components may be changed according to the specification or form of the box girder, or may be carried out by replacing with other configurations having the same effect. .

Claims (5)

The upper panel is fixedly mounted on the thrust-type support frame which is moved in the longitudinal direction by the wheel in accordance with the box girder standard of one span with the structure of the movable internal formwork for the box girder construction of pre-stressed concrete bridge. Panels and left and right anchor block panels are provided, and left and right connecting panels are respectively provided in a folding manner between the upper panel and the left and right panels, and between the upper panel and the left and right anchor block panels, respectively. In the prefabricated movable internal formwork, which is installed by folding the buckle, The left and right connecting panels are supported by the hinges at the left and right ends of the upper panel so as to be folded downward, and the other ends are connected to the upper ends of the left and right panels and the left and right anchor block panels by hook-type fixing means, and these left and right connecting panels are respectively It is connected to the panels by a separate independent hydraulic cylinder so that it can be folded. The lower part of the left and right anchor block panels respectively forms a lower part of the anchor block. The upper end is hinged to the lower outer end of the left and right anchor block panels and the lower part is the inner side. A movable internal formwork for box girder construction of prestressed concrete bridges comprising an auxiliary panel connected to the bottom inner side of the left and right anchor block panels by a turn buckle to be folded. According to claim 1, wherein the hook fixing means of the left and right connecting panels, At the distal end of the upper frame 31 supporting the upper outer plate 30a of the left and right panels 30, a lower arc-shaped fixing groove 33 and an inclined end 34 are formed at the lower end thereof. Above the groove 33 is formed a fixing piece 31a having a reinforcing bar 36 to the left and right, and a fixing hole 35 formed therethrough, and a folding end of the connecting panel 50 is a reinforcing bar to the fixing piece 31a. A left and right insertion piece 51a overlapping the outside of the 36 pieces is formed at the tip of the H-shaped frame 51 of the connecting panel, and the lower end of the insertion piece 51a is caught by the semi-circular arc fixing fixing groove 33. The fixing rod 52 to be seated is fixed to the pivot type, and the upper end is provided with insertion holes 53 for fixing the fixing pin 54 in the state aligned with the fixing hole 35 integrally. Mobile internal formwork for box girder construction of prestressed concrete bridges. The outer plate formed in the fixing unit of the left and right connection panels according to claim 1, wherein the outer plate of the connection panel 50 includes two horizontal frames 50c and the upper horizontal frame 30c of the left and right panels 30. It is installed on the upper end of the connecting panel frame 51 with a width narrower than the space between the horizontal frame 21 on one side of the upper panel 20, and fixed to the fixed outer plate 50a thereon, The upper outer plate 30a of the left and right panels 30 is configured to span only the middle of the upper end of the upper horizontal frame 30c installed at the upper end of the H-type upper frame 31, The outer plate 20a of the upper panel 20 forms an extension outer plate 20b extending from the left and right sides to a position in contact with the fixed outer plate 50a of the left and right connecting panels 50, A prefabricated outer plate made of a separate member in the space between the fixed outer plate 50a of the connecting panel 50 and the upper outer plate 30a of the left and right panels 30 generated when the left and right connecting panels 50 are assembled and fixed. A movable internal formwork for box girder construction of prestressed concrete bridges, characterized in that it is configured to be provided with a configuration (50b). The auxiliary panel formed at the bottom of the left and right anchor block panel according to claim 1, wherein the top of the anchor block panel outer plate (40a) and the anchor block panel support frame (40b) at the lower end of the left and right anchor block panel (40) An upper hinge plate 62 is hinged to the brackets 42 installed therebetween, and a lower hinge plate 63 protruding is attached to a lower end of the H-shaped frame 41 of the left and right anchor block panels 40. The movable inner formwork for box girder construction of prestressed concrete bridges, characterized in that it consists of a secondary panel (60), which is installed folding by a turn buckle (16) between the bracket (43) attached to the. The support means of claim 1, wherein the left and right panels and the left and right anchor block panels support the intermediate frame of the trust support frame. The left and right moving supports 70 and 70a supporting the left and right panels 30 and the left and right anchor block panels 40 at the left and right ends of the trust type support frame, and slide pads on the inner left and right walls of the intermediate frame 10c. 71) and a movable internal formwork for the box girder construction of prestressed concrete bridge, characterized in that the support rollers (72) are installed to support the lower side of the front end.