CN106120563A - Cast-in-situ box girder Combined movable mould bases and construction method thereof - Google Patents

Abstract

The present invention relates to a kind of cast-in-situ box girder Combined movable mould bases, specifically include that bracket Support bracket, cross moving track, assembly pulley platform, longitudinal Bailey beam, horizontal Bailey beam, outer mould holder, traversing platform, traversing jack A, vertical shift jack, traversing jack B；Assembly pulley platform and cross moving track side arrange traversing jack A, and traversing jack A one end is fixed on assembly pulley platform, and the other end is fixed on cross moving track；Bottom longitudinal Bailey beam, longitudinal direction arranges vertical shift jack；Vertical shift jack base is fixed on assembly pulley platform, and the other end is fixed on vertical shift guide rail beam by connector E；Outer mould holder is lateral symmetry separate type structure, and both sides end template is bolted on together.The structure that the present invention relates to has easy accessibility, and efficiency of construction is high, it is not necessary to repeat to remove support and die carrier structure, mobile formwork and girder can be with automatization's vias, it is achieved the continuous construction of cast-in-situ box girder, has preferable economic technology benefit.

Description

Composite mobile formwork for cast-in-place box girder and its construction method

technical field

The invention relates to a composite mobile formwork for a cast-in-place box girder, which belongs to the field of building construction engineering, and in particular to a construction method for a cast-in-place box girder based on a composite mobile formwork.

Background technique

Prestressed concrete girder bridges occupy a dominant position in my country's small and medium-span bridges. In addition to the commonly used full pavement method of pouring hole by hole and whole hole prefabricated erection, the construction method also uses a large number of mobile formwork to pour hole by hole, which effectively promotes bridge construction. The mechanization process of construction.

The traditional cast-in-place box girder supporting formwork has poor adaptability, low construction efficiency, and the formwork and formwork brackets need to be removed repeatedly. In order to adapt to the different structural systems and structural characteristics of prestressed concrete beams, new mobile formworks with different characteristics have emerged one after another, and the beam-mold-integrated mobile formwork is one of them.

Contents of the invention

The purpose of the present invention is to propose a cast-in-place box girder composite mobile formwork and its construction in view of the shortcomings of the traditional cast-in-place box girder support formwork, such as poor adaptability, low construction efficiency, and repeated removal of the formwork and formwork brackets. According to the method, the cast-in-place box girder composite mobile formwork includes a movable longitudinal Bailey beam, a detachable formwork and a formwork integrated mobile formwork, and a composite mobile formwork such as longitudinal and lateral movement tracks.

In order to realize above-mentioned technical purpose, the present invention adopts following technical scheme:

The cast-in-place box girder composite mobile formwork is characterized in that the composite mobile formwork mainly includes: corbel support brackets, traversing tracks, pulley block platforms, longitudinal Bailey beams, transverse Bailey beams, and outer mold supports , traversing platform, traversing jack A, longitudinal jack and traversing jack B; the traversing track is set on the corbel support bracket, and the limit block A is set on the outside of the traversing track; the pulley block platform is placed on the traversing track, and the pulley block The longitudinal pulley A is set on the platform; the longitudinal Bailey beam is placed on the pulley block platform, and the traverse platform track is set on the longitudinal Bailey beam; the traverse platform is arranged at the bottom of the outer mold support, and the outer mold support is placed on the traverse platform track; The thunder beam is hinged and fixedly connected with the transverse Bailey beam.

A traversing jack A is arranged on the side of the pulley block platform and the traversing track, and one end of the traversing jack A is fixed on the pulley block platform through a connecting piece A, and the other end is fixed on the traversing track through a connecting piece B.

The corbel support brackets are fixed on the pier columns through embedded parts and cooperate with the bracket pull rods beside the pier to pull the pairs of corbel support brackets on opposite sides together.

A jack is arranged between the pulley block platform and the longitudinal Bailey beam.

The longitudinal guide rail beam is arranged at the bottom of the longitudinal Bailey beam.

A longitudinal jack is arranged at the bottom of the longitudinal Bailey beam; the base of the longitudinal jack is fixed on the pulley block platform, and the other end is fixed on the longitudinal guide rail beam through the connector E.

A traversing jack B is arranged at the bottom of the traversing platform, and one end of the traversing jack B is fixed on the traversing platform through a connecting piece C, and the other end is fixed on the track of the traversing platform through a connecting piece D.

The outer mold support is a two-sided symmetrical and separated structure, and the bottom templates on both sides are fixed together by bolts.

A supporting spiral top is provided on the top of the transverse Bailey beam, and cushion blocks are arranged on the supporting spiral top.

The construction method based on the composite mobile formwork cast-in-place box girder is characterized in that it comprises the following steps:

Step 1. Installation of corbel support bracket: according to the design requirements, pre-embed the embedded parts at the designated position of the pier column. After the strength of the pier column meets the design requirements, fix the corbel support bracket on the pier column through the embedded parts and cooperate The bracket pull rod beside the pier further fixes the corbel support bracket;

Step 2. Installation of the traversing platform: first fix the traversing track to the corbel support bracket through bolts, then place the platform pulley block on the traversing track, and install the traversing jack A in place;

Step 3. Bailey beam installation: the longitudinal Bailey beam and the transverse Bailey beam are pre-assembled on the ground, and the longitudinal Bailey beam is hoisted to the pulley block platform by a crane. After the Bailey beam is installed in place, the horizontal Bailey beam is hoisted to the designated position and connected with the longitudinal Bailey beam through a hinged joint;

Step 4. Formwork installation: Weld the traverse platform track on the longitudinal Bailey beam according to the design requirements, hoist the prefabricated outer mold support onto the traverse platform track, control the traverse jack A to the designated position and then control the traverse Move the jack B to move the outer mold bracket inward to the specified position, fix the outer mold brackets on both sides together with bolts, control the jack to lift the whole structure to the specified position and adjust the supporting screw top to make it bear the force;

Step 5, hoisting of reinforcement cage and concrete pouring: hoist the pre-bound reinforcement cage into the formwork, pour concrete and maintain it after all the inner molds are installed;

Step 6. Formwork removal: After the maintenance meets the design requirements, control the shrinkage of the jack to lower the overall structure, and automatically demould it under the action of gravity, then remove all the connecting bolts between the outer mold supports on both sides, and then control the lateral movement Jack B moves the outer mold support to the designated position.

Step 7. Construction of the via hole and the next section of box girder: Remove the hinged joint and cooperate with the traction wire rope to separate it from the longitudinal Bailey beam on one side, pull it to the longitudinal Bailey beam on the other side and fix it temporarily, and control the traverse jack A to make the pulley block The platform moves horizontally to the designated position, and then controls the longitudinal jack to move the vertical Bailey beam to realize the passage. After passing the hole to the designated position, the next section of box girder construction will start.

The present invention has following characteristics and beneficial effect:

(1) The formwork and the bracket are integrated, and the formwork on both sides can be separated when it is removed, so that the formwork can pass through the hole smoothly.

(2) The Bailey main beam is placed on the longitudinal movement platform, and the Bailey main beam can be moved longitudinally by controlling the jack, without repeated demolition of the Bailey main beam.

(3) The transverse Bailey beam and the longitudinal Bailey main beam are hinged together. Part of the hinged joints are removed before the hole is passed, and the transverse Bailey beam is pulled to the longitudinal Bailey beam with the wire rope and fixed temporarily, without affecting the construction of the hole.

Description of drawings

Fig. 1 is the sectional view of the construction state of the cast-in-place box girder based on the composite movable formwork;

Fig. 2 is a sectional view of the demoulding state of the cast-in-place box girder based on the composite mobile formwork;

Figure 3 is a transverse cross-sectional view of the central transverse Bailey beam;

Fig. 4 is a 2-2 sectional view;

Fig. 5 is 1-1 sectional view;

Figure 6 is a state diagram when the transverse Bailey beam is removed;

Fig. 7 is a state diagram when the longitudinal Bailey beam moves laterally;

In the figure: 1. Corbel supporting bracket, 2. Embedded parts, 3. Bracket pull rod beside the pier, 4. Traversing track, 5. Limiting block A, 6. Pulley block platform, 7. Traversing jack A, 8. Connector A, 9. Connector B, 10. Pulley A, 11. Longitudinal Bailey beam, 12. Vertical jack base, 13. Jack, 14. Transverse Bailey beam, 15. Outer mold support, 16. Traverse platform, 17. pulley A, 18. traverse platform track, 19. traverse jack B, 20. connector C, 21. connector D, 22. back frame, 23. outer formwork, 24. bottom formwork, 25. Bolt, 26. Baffle form, 27. Guardrail, 28. Supporting screw top, 29. Pad block, 30. Articulated joint, 31. Internal mold, 32. Hydraulic support, 33. Limiting block B, 34. Longitudinal Move the guide rail beam, 35. longitudinally moving jack, 36. connector E, 37. pier column, 38. box girder, 39. traction wire rope.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are explanations of the present invention and are not limited to the following examples.

Figure 1 is a cross-sectional view of the construction state of a cast-in-place box girder based on a composite mobile formwork. The composite mobile formwork shown in Figure 1 mainly includes: corbel support bracket 1, traversing track 4, pulley block platform 6, longitudinal Bailey beam 11, transverse Bailey beam 14, outer mold support 15, traversing Platform 16, traversing jack A7, longitudinal jack 35, traversing jack B19, baffle mold 26 and guardrail 27.

The traversing track 4 is set on the corbel support bracket 1, and the limit block A5 is set on the outside of the traversing track 4; the pulley block platform 6 is placed on the traversing track 4, and the longitudinal pulley A10 is set on the pulley block platform 6; the longitudinal Bailey beam 11 is placed On the pulley block platform 6, the transverse movement platform track 18 is set on the longitudinal Bailey beam 11; the transverse movement platform 16 is arranged at the bottom of the outer mold support 15, and the outer mold support 15 is placed on the transverse movement platform track 18; the longitudinal Bailey beam 11 and the transverse movement platform The Bailey beams 14 are hinged and fixedly connected together. A traversing jack A7 is arranged on the side of the pulley block platform 6 and the traversing track 4, and one end of the traversing jack A7 is fixed on the pulley block platform 6 through the connecting piece A8, and the other end is fixed on the traversing track 4 through the connecting piece B9.

The corbel support bracket 1 is fixed on the pier column 37 through the embedded part 2 and cooperates with the bracket pull rod 3 beside the pier to pull the pair of corbel support brackets 1 on the opposite side together. A jack 13 is arranged between the pulley block platform 6 and the longitudinal Bailey beam 11 . A vertical guide rail beam 34 is arranged at the bottom of the longitudinal Bailey beam 11 .

The bottom of the traversing platform 16 is provided with a traversing jack B19, one end of the traversing jack B19 is fixed on the traversing platform 16 through the connecting piece C20, and the other end is fixed on the traversing platform track 18 through the connecting piece D21.

The outer mold support 15 is a two-sided symmetrical separated structure, and the bottom templates 24 on both sides are fixed together by bolts 25 .

Fig. 2 is a sectional view of the demoulding state of the cast-in-place box girder based on the composite mobile formwork. Control the shrinkage of the jack 13 to lower the overall structure, and automatically demould it under the action of gravity, and then remove the 15 outer mold supports on both sides. All the connecting bolts 25, and then control the traverse jack B19 to move the outer mold support 15 to the designated position.

Fig. 3 is a transverse sectional view of the transverse Bailey beam in the middle, a supporting spiral top 28 is arranged on the top of the transverse Bailey beam 14, and a spacer 29 is arranged on the supporting spiral top 28.

Fig. 4 is the 2-2 sectional view of Fig. 2, the longitudinal direction of the bottom of the longitudinal Bailey beam 11 is provided with a longitudinal movement jack 35; the base of the longitudinal movement jack 35 is fixed on the pulley block platform 6, and the other end is fixed on the longitudinal movement guide rail beam through the connector E36 34 on.

FIG. 5 is a sectional view of 1-1 in FIG. 1 , the transverse Bailey beam 14 and the longitudinal Bailey beam 11 are connected together through a hinged joint 30 .

The main construction process of the above-mentioned cast-in-place box girder based on composite mobile formwork is as follows:

Step 1. Installation of the corbel support bracket: pre-embed the embedded part 2 at the designated position of the pier column 37 according to the design requirements. After the pier column strength meets the design requirements, fix the corbel support bracket 1 on the pier through the embedded part 2 On the column 37 and cooperate with the bracket pull rod next to the pier to further fix the corbel supporting bracket 1;

Step 2. Installation of the traversing platform: first fix the traversing track 4 to the corbel support bracket 1 through bolts, then place the platform pulley block 6 on the traversing track 4, and install the traversing jack A7 in place;

Step 3, Bailey beam installation: the longitudinal Bailey beam 11 and the transverse Bailey beam 14 are pre-assembled on the ground, and the longitudinal Bailey beam 11 is hoisted to the pulley block platform 6 by a crane, and the jacking jack 13 and the vertical moving jack are installed at the bottom 35. After the longitudinal Bailey beams 11 on both sides are installed in place, the transverse Bailey beam 14 is hoisted to a designated position and connected to the longitudinal Bailey beam 11 through the hinged joint 30;

Step 4. Formwork installation: Weld the traverse platform rail 18 on the longitudinal Bailey beam 11 according to the design requirements, hoist the prefabricated outer mold support 15 onto the traverse platform rail 18, and control the traverse jack A7 to the designated position Then control the traverse jack B19 to move the outer mold support 15 inwardly to the designated position, fix the outer mold supports 15 on both sides together through bolts 25, control the jack 13 to raise the overall structure to the designated position and adjust the support screw Top 28 makes it stressed;

Step 5, hoisting of reinforcement cage and concrete pouring: hoisting the pre-bound reinforcement cage into the formwork, pouring concrete and curing after all the inner molds 31 are installed;

Step 6, demoulding: After the maintenance meets the design requirements, control the shrinkage of the jack 13 to lower the overall structure, and automatically demould it under the action of gravity, then remove all the connecting bolts 25 between the outer mold supports 15 on both sides, and then Control the traverse jack B19 to move the outer mold support 15 to the designated position;

Step 7. Construction of the via hole and the next section of box girder: remove the hinged joint 30 and cooperate with the traction wire rope 39 to separate it from the longitudinal Bailey beam 11 on one side, pull it to the longitudinal Bailey beam 11 on the other side and fix it temporarily, and control the lateral movement The jack A7 moves the pulley block platform 6 laterally to the designated position, and then controls the longitudinal moving jack 35 to make the vertical Bailey beam 11 move longitudinally to realize the passage, and then proceed to the next section of box girder construction after passing the hole to the designated position.

Claims (10)

1. Cast-in-place box girder composite mobile formwork, characterized in that the composite mobile formwork mainly includes: corbel support bracket (1), traverse track (4), pulley block platform (6), longitudinal shell Thunder beam (11), transverse Bailey beam (14), outer mold support (15), traverse platform (16), traverse jack A (7), longitudinal jack (35) and traverse jack B (19) ; The traversing track (4) is set on the corbel support bracket (1), and the limit block A (5) is set on the outside of the traversing track (4); the pulley block platform (6) is placed on the traversing track (4), and the pulley block The longitudinal pulley A (10) is set on the platform (6); the longitudinal Bailey beam (11) is placed on the pulley block platform (6), and the traverse platform track (18) is set on the longitudinal Bailey beam (11); the outer mold support ( 15) A traversing platform (16) is set at the bottom, and the outer mold bracket (15) is placed on the traversing platform track (18); the longitudinal Bailey beam (11) and the transverse Bailey beam (14) are hinged and fixedly connected together. 2. The cast-in-place box girder composite mobile formwork according to claim 1, characterized in that, the side of the pulley block platform (6) and the traversing track (4) is provided with a traversing jack A (7), and the traversing One end of the jack A (7) is fixed on the pulley block platform (6) through the connecting piece A (8), and the other end is fixed on the traversing track (4) through the connecting piece B (9). 3. The composite mobile formwork for cast-in-place box girder according to claim 1, characterized in that the support bracket (1) of the corbel (1) is fixed on the pier column (37) through the embedded part (2) and Cooperate with the bracket pull rod (3) next to the pier to pull the pair of corbel support brackets (1) on the opposite side together. 4. The cast-in-place box girder composite mobile formwork according to claim 1, characterized in that a jack (13) is arranged between the pulley block platform (6) and the longitudinal Bailey beam (11). 5. The composite mobile formwork for cast-in-place box girder according to claim 1, characterized in that, the bottom of the longitudinal Bailey beam (11) is provided with a longitudinal guide rail beam (34). 6. The composite mobile formwork for cast-in-place box girders according to claim 4, characterized in that, longitudinally moving jacks (35) are arranged at the bottom of the longitudinal Bailey beam (11); the longitudinally moving jacks (35) The base is fixed on the pulley block platform (6), and the other end is fixed on the longitudinal guide rail beam (34) through the connector E (36). 7. The composite mobile formwork for cast-in-place box girder according to claim 1, characterized in that, the bottom of the traversing platform (16) is provided with a traversing jack B (19), and one end of the traversing jack B (19) It is fixed on the traversing platform (16) through the connecting piece C (20), and the other end is fixed on the traversing platform track (18) through the connecting piece D (21). 8. The cast-in-place box girder composite mobile formwork according to claim 1, characterized in that, the outer formwork support (15) is a symmetrical and separated structure on both sides, and the bottom formwork (24) on both sides is connected by bolts ( 25) Fastened together. 9. The cast-in-place box girder composite mobile formwork according to claim 1, characterized in that, the top of the transverse Bailey beam (14) is provided with a supporting screw top (28), and the supporting screw top (28) is provided with Block (29). 10. The construction method based on the composite mobile formwork cast-in-place box girder, is characterized in that comprising the following steps: Step 1. Installation of corbel support bracket: according to the design requirements, pre-embed the embedded part (2) at the designated position of the pier column (37). After the pier column strength meets the design requirements, install the corbel support bracket (1) The embedded part (2) is fixed on the pier column (37) and cooperates with the bracket pull rod beside the pier to further fix the corbel supporting bracket (1); Step 2. Installation of the traversing platform: First, fix the traversing track (4) to the corbel support bracket (1) with bolts, then place the platform pulley block (6) on the traversing track (4), and place the traversing jack A (7) installed in place; Step 3. Bailey beam installation: the longitudinal Bailey beam (11) and the transverse Bailey beam (14) are pre-assembled on the ground, and the longitudinal Bailey beam (11) is hoisted to the pulley block platform (6) by a crane, and the bottom is set Jacking jacks (13) and longitudinal moving jacks (35), after the longitudinal Bailey beams (11) on both sides are installed in place, hoist the transverse Bailey beams (14) Lightning beam (11) connection; Step 4. Formwork installation: Weld the traverse platform track (18) on the longitudinal Bailey beam (11) according to the design requirements, hoist the prefabricated outer mold support (15) onto the traverse platform track (18), Control the traversing jack A (7) to the specified position, then control the traversing jack B (19) to move the outer mold support (15) inward to the specified position, and connect the outer mold supports (15) on both sides through the bolts (25) ) are fixed together, and the jack (13) is controlled to raise the overall structure to a designated position and the supporting screw top (28) is adjusted to be stressed; Step 5, hoisting of reinforcement cage and pouring concrete: hoisting the pre-bundled reinforcement cage into the formwork, pouring concrete and curing after all the inner molds (31) are installed; Step 6, demoulding: After the maintenance meets the design requirements, control the jack (13) to shrink to lower the overall structure, and automatically demold it under the action of gravity, and then remove all the connections between the outer mold supports (15) on both sides Bolt (25), and then control the traverse jack B (19) to move the outer mold support (15) to the designated position; Step 7. Construction of the via hole and the next section of box girder: remove the hinged joint (30) and cooperate with the traction wire rope (39) to separate it from the longitudinal Bailey beam (11) on one side, and pull it to the longitudinal Bailey beam (11) on the other side ) and temporarily fix it, control the traverse jack A (7) to make the pulley block platform (6) traverse to the designated position, and then control the longitudinal traverse jack (35) to make the vertical Bailey beam (11) vertically move to achieve the through hole, through the hole to After specifying the location, proceed to the next section of box girder construction.