A three-main-beam movable formwork structure

Abstract

A three-main-beam mobile formwork structure, bottom formwork I and bottom formwork II on both sides and side formworks constitute a casting area, concrete is cast inside it to form a concrete box beam, after the concrete box beam is made, the bottom formwork driving device drives the bottom formwork I and the bottom formwork II to fall out of the formwork, after the bolts between the cross beam I and the cross beam II are removed, the mobile mechanism drives the trolley to move along the corbel to the outer end, thereby driving the bottom formwork II and the side formwork on the side main beam and the cross beam II to move outward to realize the movement of the cross beam II to the outside of the bridge pier, thereby meeting the needs of the longitudinal movement of the mobile formwork, and the cross beam II will not interfere with the bridge pier during the longitudinal movement. The mobile formwork is equipped with a bottom formwork driving device that drives the bottom formwork to be adjusted vertically to meet the needs of cast-in-place construction of large-span arch bridges.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a three-main-beam movable formwork structure. Background Art

[0002] Mobile formwork bridge construction machine is a kind of construction machinery that comes with its own formwork and uses abutments or piers as support to cast bridges on site. Its main features are: good construction quality, simple construction operation, low cost, etc. Therefore, mobile formwork is more and more widely used in bridge construction. The traditional mobile formwork adopts a double main beam method, but when the concrete box beam to be cast is of super-wide specifications, the mobile formwork bridge construction machine needs to use a three-main beam structure. However, how to move the mobile formwork with a three-main beam structure longitudinally through the hole becomes a problem that needs to be solved. As shown in the attached figure Figure 7 As shown, the construction of large-span arch bridges is usually carried out using hanging baskets or scaffolds. The hanging basket is not a one-time casting, which degrades the bridge structure. Although the scaffold construction is a one-time cast-in-place construction, it has high requirements on the foundation and is not suitable for cross-sea and mountainous areas. Summary of the invention

[0003] In order to overcome the deficiencies of the above technologies, the present invention provides a three-main-beam movable formwork structure that can meet the needs of longitudinal movement through holes after the concrete box beam is poured.

[0004] The technical solution adopted by the present invention to overcome the technical problems is:

[0005] A three-main-beam movable formwork structure comprises brackets respectively arranged on the outer sides of two bridge piers, and further comprising:

[0006] The middle main beam is arranged in the middle position of the mobile formwork, and its lower end is installed on the longitudinal moving trolley of the mobile formwork. The left and right sides of the upper end of the middle main beam are respectively installed with cross beams I horizontally, and the cross beam I is located between the two piers;

[0007] Two side main beams are respectively arranged on the left and right sides of the middle main beam, and cross beams II are respectively installed horizontally on the left and right sides of the upper end of the side main beam, and the cross beam II located at the inner end is fixed to the corresponding cross beam I on the same side by bolts;

[0008] The trolley is slidably mounted on the corbel along the left and right directions of the corbel through a moving mechanism, and the lower end of the side main beam is fixed on the corresponding trolley on the same side;

[0009] A plurality of bottom template driving devices are arranged on the cross beam I in the left and right directions, and the bottom template I is installed on the bottom template driving device, and the bottom template driving device drives the bottom template I to move up and down;

[0010] A side template is installed on the upper end of the cross beam II located at the outer end of the side main beam. A plurality of bottom template driving devices are arranged on the left and right sides of the cross beam II. The bottom template II is installed on the bottom template driving device. The bottom template driving device drives the bottom template II to move up and down.

[0011] The bottom formwork I and the two bottom formwork IIs match the bottom curve of the concrete box girder.

[0012] Furthermore, the above-mentioned moving mechanism includes flange plates horizontally arranged on the front and rear sides of the corbel and a cylinder III horizontally arranged along the left and right directions. The lower end of the trolley is in contact with the upper end surface of the corbel, the tail end of the cylinder III is hingedly connected to the corbel, the head end of the piston rod of the cylinder III is hingedly connected to the trolley, the buckle plate is located at the lower end of the flange plate, and the upper end surface of the buckle plate is in sliding friction contact with the lower end surface of the flange plate, and the buckle plate is fixed to the trolley by connecting bolts.

[0013] Furthermore, the bottom template driving device comprises a follower cylinder and a positioning cylinder respectively installed vertically on the beam I or beam II in the front-to-back direction, the lower ends of the follower cylinder and the positioning cylinder are hingedly connected to the corresponding beam I or beam II, and the piston rod head ends are hingedly connected to the lower ends of the corresponding bottom template I or bottom template II, the outer ends of the follower cylinder and the positioning cylinder are respectively provided with bases, the upper ends of the bases are provided with mechanical screw tops, the mechanical screw tops are installed above the mechanical screw tops, and the mechanical screw tops are connected to the corresponding bottom template I or bottom template II. An ear plate is connected, and the outer end of the ear plate is hingedly connected to the corresponding bottom template I or bottom template II through a pin shaft. When the base is in a vertical state, the lower end of the base is fixedly connected to the corresponding crossbeam I or crossbeam II by bolts, and the screw head end of the mechanical spiral top is in contact with the lower end of the corresponding bottom template I or bottom template II. When the lower end of the mechanical spiral top is not connected to the bottom template I or bottom template II and the follower cylinder and the positioning cylinder drive the bottom template to rise, the base rotates outward under the action of gravity, and the two bases are arranged in an eight-shaped state.

[0014] In order to improve stability, a stabilizing frame is also included, which is arranged between the two bases of each bottom template driving device. The inner ends of the two bases are connected to the stabilizing frame by bolts, and the upper end of the stabilizing frame is suspended under the corresponding bottom template I or bottom template II by a steel wire rope.

[0015] Preferably, the base is composed of a plurality of pads stacked from top to bottom, and the pads are fixed by bolts.

[0016] The beneficial effects of the present invention are as follows: the bottom formwork I and the bottom formwork II on both sides and the side formwork constitute a casting area, concrete is cast inside the bottom formwork to form a concrete box beam, after the concrete box beam is formed, the bottom formwork driving device drives the bottom formwork I to drop the formwork, drives the bottom formwork II to drop the formwork, removes the bolts between the cross beam I and the cross beam II, and then the moving mechanism drives the trolley to move along the corbel to the outer end, thereby driving the bottom formwork II and the side formwork on the side main beam and the cross beam II to move outward to realize the movement of the cross beam II to the outside of the bridge pier, thereby meeting the needs of the longitudinal movement of the mobile formwork, and the cross beam II will not interfere with and collide with the bridge pier during the longitudinal movement. The mobile formwork is equipped with a bottom formwork driving device that drives the bottom formwork to be adjusted vertically to meet the needs of cast-in-place construction of large-span arch bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention when pouring a concrete box girder;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention when longitudinally moving through a hole;

[0019] Figure 3 It is a structural schematic diagram of the oil cylinder III part of the present invention;

[0020] Figure 4 It is a schematic diagram of the state of the mechanical spiral top supporting the bottom template of the present invention;

[0021] Figure 5 It is a schematic diagram of the state in which the base of the present invention is swung outwards;

[0022] Figure 6 It is a schematic diagram of the bottom mold dropping state of the present invention;

[0023] Figure 7 It is a longitudinal structural schematic diagram of a long-span arch bridge of the present invention;

[0024] In the figure, 1. concrete box girder 2. corbel 3. longitudinal moving trolley 4. middle main beam 5. bottom formwork I 6. mechanical screw top 7. side main beam 8. cross beam II 9. connecting bolts 10. cross beam I 11. bottom formwork II 12. trolley 13. cylinder II 14. flange plate 15. buckle plate 16. base 17. follower cylinder 18. positioning cylinder 19. stabilizing frame 20. wire rope 21. ear plate 22. pin shaft. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 , Attachment Figure 2 , Attachment Figure 3 The present invention is further described.

[0026] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3As shown, a three-main-beam mobile formwork structure includes a corbel 2 respectively arranged on the outer sides of two piers, and also includes: an intermediate main beam 4, which is arranged in the middle position of the mobile formwork, and its lower end is installed on the longitudinal movement trolley 3 of the mobile formwork, and the left and right sides of the upper end of the intermediate main beam 4 are respectively installed with a cross beam Ⅰ 10 horizontally, and the cross beam Ⅰ 10 is located between the two piers; two side main beams 7, which are respectively arranged on the left and right sides of the intermediate main beam 4, and the left and right sides of the upper end of the side main beam 7 are respectively installed with a cross beam Ⅱ 8 horizontally, and the cross beam Ⅱ 8 located at the inner end is fixed to the corresponding cross beam Ⅰ 10 on the same side by bolts; a trolley 12 is slidably installed on the corbel 2 along the left and right directions of the corbel 2 through a moving mechanism, and the lower end of the side main beam 7 is fixed on the corresponding trolley 12 on the same side; a plurality of bottom template driving devices are arranged on the cross beam Ⅰ 10 along the left and right directions, and the bottom template Ⅰ 5 is installed on the bottom template driving device, and the bottom template driving device drives the bottom template Ⅰ 5 moves up and down; a side formwork is installed on the upper end of the cross beam II 8 located at the outer end of the side main beam 7, and a plurality of bottom formwork driving devices are arranged on the cross beam II 8 along the left and right directions. The bottom formwork II 11 is installed on the bottom formwork driving device, and the bottom formwork driving device drives the bottom formwork II 11 to move up and down; the bottom formwork I 5 and the two bottom formworks II 11 match the bottom curve of the concrete box beam 1. The bottom formwork Ⅰ 5 and the bottom formwork Ⅱ 11 on both sides and the side formwork constitute the casting area, and concrete is cast inside it to form the concrete box beam 1. After the concrete box beam 1 is formed, the bottom formwork driving device drives the bottom formwork Ⅰ 5 to drop the mold and drives the bottom formwork Ⅱ 11 to drop the mold. After the bolts between the cross beam Ⅰ 10 and the cross beam Ⅱ 8 are removed, the mobile mechanism drives the trolley 12 to move toward the outer end along the corbel 2, thereby driving the bottom formwork Ⅱ 11 and the side formwork on the side main beam 7 and the cross beam Ⅱ 8 to move outward to realize the movement of the cross beam Ⅱ 8 to the outside of the bridge pier, thereby meeting the needs of the longitudinal movement of the mobile formwork, and the cross beam Ⅱ 8 will not interfere with the bridge pier during the longitudinal movement. The mobile formwork is equipped with a bottom formwork driving device that drives the bottom formwork to adjust vertically, which can meet the needs of cast-in-place construction of large-span arch bridges.

[0027] The moving mechanism may be a structure as follows, which includes flange plates 14 horizontally arranged at the front and rear sides of the corbel 2 and a cylinder III 13 horizontally arranged in the left and right directions. The lower end of the trolley 12 contacts the upper end surface of the corbel 2, the tail end of the cylinder III 13 is hingedly connected to the corbel 2, the piston rod head end of the cylinder III 13 is hingedly connected to the trolley 12, the gusset plate 15 is located at the lower end of the flange plate 14, and the upper end surface of the gusset plate 15 is in sliding friction contact with the lower end surface of the flange plate 14, and the gusset plate 15 is fixed to the trolley 12 by connecting bolts 16. The piston rod of the cylinder III 13 extends outward, which pushes the trolley 12 to slide outward along the corbel 2. Since the flange plates 14 are arranged at the front and rear ends of the corbel 2, the gusset plate 15 is below the flange plate 14, thereby playing a role in limiting the position of the trolley 12, ensuring that the trolley 12 only moves in the left and right directions of the corbel 2.

[0028] As attached Figure 4 As shown, the bottom template driving device can be the following structure, which includes a follower cylinder 17 and a positioning cylinder 18 vertically installed on the beam Ⅰ 10 or the beam Ⅱ 8 respectively along the front and rear directions, the lower ends of the follower cylinder 17 and the positioning cylinder 18 are hingedly connected to the corresponding beam Ⅰ 10 or beam Ⅱ 8, and the piston rod head ends are hingedly connected to the lower ends of the corresponding bottom template Ⅰ 5 or bottom template Ⅱ 11, and the outer ends of the follower cylinder 17 and the positioning cylinder 18 are respectively provided with a base 16, and the upper end of the base 16 is provided with a mechanical screw top 6, and the mechanical screw top 6 is installed above the mechanical screw top 6, and the mechanical screw top 6 is connected to an ear plate 21, and the outer end of the ear plate 21 is hingedly connected to the corresponding bottom template Ⅰ 5 or bottom template Ⅱ 11 through a pin shaft 22. When the base 16 is in a vertical state, the lower end of the base 16 is connected and fixed to the corresponding beam Ⅰ 10 or beam Ⅱ 8 by bolts, and the screw head end of the mechanical screw top 6 is connected to the corresponding bottom template Ⅰ 5 or the lower end of the bottom template II 11 is in contact. When the lower end of the mechanical screw top 6 is not connected to the bottom template I 5 or the bottom template II 11 and the follower cylinder 17 and the positioning cylinder 18 drive the bottom template to rise, the base 16 rotates outward under the action of gravity, and the two bases 16 are arranged in an eight-shaped state. When the concrete box girder 1 is poured and tensioned, the bottom formwork Ⅰ 5 or the bottom formwork Ⅱ 11 is supported by the mechanical screw top 6, and the base 16 is in a vertical state. The base 16 transmits the supporting force to the beam Ⅰ 10 or the beam Ⅱ 8, and then the bottom formwork Ⅰ 5, the bottom formwork Ⅱ 11, the side formwork, the beam Ⅰ 10, the beam Ⅱ 8 and the mechanical screw top 6 are molded as a whole with the mobile formwork. Generally, the mold dropping height is 20 cm, so that the bottom formwork Ⅰ 5, the bottom formwork Ⅱ 11 and the side formwork are separated from the concrete box girder 1, and the bolts between the base 16 below the mechanical screw top 6 and the corresponding beam Ⅰ 10 or beam Ⅱ 8 are released. The piston rods of the follower cylinder 17 and the positioning cylinder 18 extend outward to drive the bottom formwork Ⅰ 5 or the bottom formwork Ⅱ 11 to rise to a certain height (generally 10 cm). At this time, under the action of gravity, the mechanical screw top 6 and the base 16 rotate outward, as shown in the attached figure. Figure 5 In the state shown, the screw head end of the mechanical screw top 6 is separated from the bottom template Ⅰ 5 or the bottom template Ⅱ 11. Thus, the purpose of leaving the cross beam Ⅰ 10 or the cross beam Ⅱ 8 is achieved. Figure 6As shown, the piston rods of the follower cylinder 17 and the positioning cylinder 18 are retracted inward, thereby driving the bottom template Ⅰ 5 or the bottom template Ⅱ 11 to connect the mechanical screw top 6 and the base 16 to descend, thereby realizing the overall mold drop. Since the bottom height curve of the concrete box girder 1 changes during the arch bridge construction, the bottom template Ⅰ 5 or the bottom template Ⅱ 11 is in an inclined state. Therefore, the present invention can drive the front and rear ends of the bottom template to move respectively by arranging the follower cylinder 17 and the positioning cylinder 18 on both sides thereof, so that it can be changed from an inclined state to a horizontal state, so that the bottom template Ⅰ 5 or the bottom template Ⅱ 11 can better fit the curve change of the bottom of the concrete box girder 1.

[0029] Furthermore, a stabilizing frame 19 is included, which is arranged between the two bases 16 of each bottom template driving device. The inner ends of the two bases 16 are connected to the stabilizing frame 19 by bolts, and the upper end of the stabilizing frame 19 is suspended below the corresponding bottom template Ⅰ 5 or bottom template Ⅱ 11 by a steel wire rope 20. Since the height of the base 6 is relatively high, the fixing firmness between the two bases 16 can be improved by the stabilizing frame 19. When the base 16 swings outward, the bolts between the stabilizing frame 19 and the base 16 are removed, and the stabilizing frame 19 is suspended and fixed below the bottom template Ⅰ 5 or bottom template Ⅱ 11 by the steel wire rope 20. In order to facilitate the longitudinal movement of the mobile formwork to the next span construction, the stabilizing frame 19 is connected and fixed to the two bases 16.

[0030] Preferably, the base 16 is composed of a plurality of pads stacked from top to bottom, and each pad is fixed by bolts. Each pad can be set to different heights, so that bases 16 of different heights can be achieved by stacking, which is convenient for overlapping to form different heights of the base 16 required at the bottom when the height curve of the concrete box girder changes.

Claims

1. A three-main-beam movable formwork structure, comprising brackets (2) respectively arranged on the outside of two bridge piers, characterized in that: Also includes: An intermediate main beam (4) is arranged in the middle of the mobile formwork, and its lower end is mounted on the longitudinal movement trolley (3) of the mobile formwork. A cross beam I (10) is horizontally mounted on the left and right sides of the upper end of the intermediate main beam (4), and the cross beam I (10) is located between the two bridge piers. Two side main beams (7) are respectively arranged on the left and right sides of the middle main beam (4); cross beams II (8) are respectively installed horizontally on the left and right sides of the upper ends of the side main beams (7); the cross beam II (8) located at the inner end is fixed to the corresponding cross beam I (10) on the same side by bolts; A trolley (12) is slidably mounted on the corbel (2) along the left-right direction of the corbel (2) via a moving mechanism, and the lower end of the side main beam (7) is fixed to the trolley (12) corresponding to the same side; A plurality of bottom template driving devices are arranged on the cross beam I (10) along the left and right directions, the bottom template I (5) is mounted on the bottom template driving device, and the bottom template driving device drives the bottom template I (5) to move up and down; A side template is installed on the upper end of the cross beam II (8) located at the outer end of the side main beam (7), and a plurality of bottom template driving devices are arranged on the cross beam II (8) in the left and right directions. The bottom template II (11) is installed on the bottom template driving device, and the bottom template driving device drives the bottom template II (11) to move up and down; The bottom formwork I (5) and the two bottom formwork II (11) match the bottom curve of the concrete box beam (1); The moving mechanism comprises flange plates (14) respectively arranged horizontally on the front and rear sides of the corbel (2) and a cylinder III (13) arranged horizontally in the left and right directions, the lower end of the trolley (12) contacts the upper end surface of the corbel (2), the tail end of the cylinder III (13) is hingedly connected to the corbel (2), the piston rod head end of the cylinder III (13) is hingedly connected to the trolley (12), the pinch plate (15) is located at the lower end of the flange plate (14), and the upper end surface of the pinch plate (15) is in sliding friction contact with the lower end surface of the flange plate (14), and the pinch plate (15) is fixed to the trolley (12) by connecting bolts (9); The bottom template driving device comprises a follower cylinder (17) and a positioning cylinder (18) respectively vertically mounted on the cross beam I (10) or the cross beam II (8) along the front-back direction, wherein the lower ends of the follower cylinder (17) and the positioning cylinder (18) are hingedly connected to the corresponding cross beam I (10) or cross beam II (8), and the piston rod heads thereof are hingedly connected to the lower ends of the corresponding bottom template I (5) or bottom template II (11), and the outer ends of the follower cylinder (17) and the positioning cylinder (18) are respectively provided with bases (16), and the upper ends of the bases (16) are provided with mechanical screw tops (6), which are mounted above the mechanical screw tops (6), and the mechanical screw tops (6) are connected to ear plates ( 21), the outer end of the ear plate (21) is hingedly connected to the corresponding bottom template I (5) or bottom template II (11) through a pin shaft (22), when the base (16) is in a vertical state, the lower end of the base (16) is connected and fixed to the corresponding cross beam I (10) or cross beam II (8) through bolts, and the screw head end of the mechanical screw top (6) is in contact with the lower end of the corresponding bottom template I (5) or bottom template II (11), when the lower end of the mechanical screw top (6) is not connected to the bottom template I (5) or bottom template II (11) and the follower cylinder (17) and the positioning cylinder (18) drive the bottom template to rise, the base (16) rotates outward under the action of gravity, and the two bases (16) are arranged in an eight-shaped state.

2. The three-main-beam movable formwork structure according to claim 1 is characterized in that: It also includes a stabilizing frame (19), which is arranged between the two bases (16) of each bottom template driving device, the inner ends of the two bases (16) are connected to the stabilizing frame (19) by bolts, and the upper end of the stabilizing frame (19) is suspended below the corresponding bottom template I (5) or bottom template II (11) by a steel wire rope (20).

3. The three-main-beam movable formwork structure according to claim 1 is characterized in that: The base (16) is composed of a plurality of cushion blocks stacked from top to bottom, and each cushion block is connected and fixed by bolts.

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