CN221052396U - Variable cross-section cast-in-situ box girder web steel bar prefabrication jig - Google Patents

Abstract

The utility model belongs to the technical field of construction devices, and particularly provides a variable-section cast-in-situ box girder web steel bar prefabrication jig which comprises an upper layer frame, a lower layer frame and support rods, wherein the upper layer frame is connected with the lower layer frame through a plurality of support rods, and the upper layer frame is positioned above the lower layer frame, so that the problems that the conventional steel bar jig is difficult to bind steel bars, difficult to guarantee quality and long in construction time due to vertical operation and lack of an operation platform in the variable-section box girder construction operation process are solved. According to the utility model, the web steel bar binding operation is optimized from vertical operation to ground horizontal operation, and the line production is adjusted to parallel operation, so that the work efficiency is improved, the deformation of the steel bar block section during hoisting caused by oversized prefabricated steel bars is eliminated, the operability is enhanced, the quality is ensured to be controllable, the construction time is saved, the material investment is reduced, and the safety risk is reduced.

Description

A prefabricated steel frame for web slabs of cast-in-place box beams with variable cross-section

Technical Field

The utility model belongs to the technical field of construction devices, and in particular relates to a prefabricated steel bar frame for a web of a variable-section cast-in-place box beam.

Background technique

Cantilever cast-in-place construction is a common method in bridge construction. During construction, the beam section construction platform is provided by the outer formwork and bottom formwork of the hanging basket. Due to space limitations, there is no reliable operating platform for the steel bar binding work of the cast-in-place beam section, especially the cast-in-place box beam, which seriously affects the construction rate. When the size of the cast-in-place box beam is too large, it is difficult to build a steel bar binding platform; especially in the case of partitions and manholes, the steel bar binding operation is a vertical operation, the steel bar binding efficiency is limited, and the quality of steel bar construction is difficult to control. The traditional cast-in-place box beam steel bar construction adopts the installation of temporary supports on the formwork, and uses manual binding from bottom to top layer by layer. Due to the low stiffness of the steel bar itself and the long size of the steel bar, the elastic deformation is large during construction, which has a great impact on the construction operation; although the ordinary ladder installation steel bar meets the requirements, the construction is inconvenient, and it is difficult to install the ladder at the position of the transverse partition. It is necessary to wait until the inclined web reinforcement is completed before the partition reinforcement can be tied. The construction time cannot be fully utilized and the main beam construction is not carried out efficiently.

A Chinese patent document with publication number CN112982182A and publication date June 18, 2021 discloses an overall lifting device for the bottom web steel bars of a variable curve cast-in-place beam and a method of using the same, comprising a prefabricated frame for bottom web steel bars, bottom web steel bars, a hoist, a gantry crane, and a formwork, wherein the formwork is a cast-in-place beam formwork, and a support rod is arranged on one side of the formwork. The prefabricated frame for bottom web steel bars is a simple frame, and the prefabricated frame for bottom web steel bars comprises channel steel, I-beam, smooth round steel bars, etc. The bottom web steel bars comprise floor steel bars, web steel bars, steel strands and crossbeam steel bars, and supports are arranged on both sides of the bottom of the prefabricated frame for bottom web steel bars. By adopting the numerical formwork for the position of the cross beam of the bottom web steel bars, a hanger with high rigidity and flexible change of lifting points, a track and anchoring setting that is easy to install and have a good limiting effect, and a simple adjustment of the thickness of the steel skeleton protective layer, the construction operability is improved, the process time is reduced, and the efficiency is improved, which has certain value for future similar engineering construction. However, this document does not solve the problem that the traditional steel frame is difficult to tie the steel bars and the quality is difficult to ensure due to vertical operation and lack of working platform during the construction of variable-section box girders.

Utility Model Content

The utility model provides a prefabricated steel bar frame for the web of a variable-section cast-in-place box girder, which aims to overcome the problems in the prior art of traditional steel bar frames in the construction process of variable-section box girders, which result in difficulty in steel bar binding, difficulty in ensuring quality and long construction time due to vertical operation and lack of working platform.

To this end, the utility model provides a variable-section cast-in-place box beam web steel bar prefabricated frame, including an upper frame, a lower frame and support rods, the upper frame is connected to the lower frame through a plurality of support rods, and the upper frame is located above the lower frame.

Preferably, the upper shelf comprises an upper shelf body 1 and an upper shelf body 2, and the upper shelf body 1 is located above the upper shelf body 2;

The upper frame body 1 includes an upper left longitudinal positioning rod 1 and an upper right longitudinal positioning rod 1, and the upper left longitudinal positioning rod 1 and the upper right longitudinal positioning rod 1 are longitudinally arranged from left to right with an interval;

The second upper frame body comprises a second upper left longitudinal positioning rod and a second upper right longitudinal positioning rod, and the second upper left longitudinal positioning rod and the second upper right longitudinal positioning rod are longitudinally arranged with intervals from left to right.

Preferably, the lower shelf comprises a lower shelf body 1 and a lower shelf body 2, and the lower shelf body 1 is located below the lower shelf body 2;

The lower frame body 1 includes a lower left longitudinal positioning rod 1, a lower right longitudinal positioning rod 1 and a transverse positioning rod 1, and the front end of the lower left longitudinal positioning rod 1 and the front end of the lower right longitudinal positioning rod 1, and the rear part of the lower left longitudinal positioning rod 1 and the rear part of the lower right longitudinal positioning rod 1 are connected by the transverse positioning rod 1;

The lower frame body 2 includes a lower left longitudinal positioning rod 2, a lower right longitudinal positioning rod 2 and a transverse positioning rod 2. The lower left longitudinal positioning rod 2 and the lower right longitudinal positioning rod 2 are connected by a plurality of transverse positioning rods 2. The plurality of transverse positioning rods 2 are arranged transversely from front to back at intervals, and the plurality of transverse positioning rods 2 are located between the two transverse positioning rods 1 of the lower frame body 1.

Preferably, the upper left longitudinal positioning rod 1, the upper left longitudinal positioning rod 2, the lower left longitudinal positioning rod 1 and the lower left longitudinal positioning rod 2 are connected by a group of multiple support rods, and the upper right longitudinal positioning rod 1, the upper right longitudinal positioning rod 2, the lower right longitudinal positioning rod 1 and the lower right longitudinal positioning rod 2 are connected by another group of multiple support rods, and the multiple support rods are vertically arranged at intervals from front to back.

Preferably, the variable-section cast-in-situ box girder web steel prefabricated tire frame also includes stirrup 1, stirrup 2, horizontal reinforcement 1, horizontal reinforcement 2, horizontal reinforcement 3 and horizontal reinforcement 4, stirrup 1 and stirrup 2 are both in a closed loop shape, transverse positioning rod 1, the lower part of stirrup 1, horizontal reinforcement 1, transverse positioning rod 2, the lower part of stirrup 2, horizontal reinforcement 2, horizontal reinforcement 3, the upper part of stirrup 1, horizontal reinforcement 4 and the upper part of stirrup 2 are distributed in sequence from bottom to top, the lower parts of multiple stirrups 1 are connected between the two transverse positioning rods 1, and the lower left longitudinal positioning rod 1 and the lower right longitudinal positioning rod 1 are connected. A plurality of horizontal bars 1 are connected, the lower parts of a plurality of stirrups 2 are connected between a plurality of transverse positioning rods 2, a plurality of horizontal bars 2 are connected between the lower left longitudinal positioning rod 2 and the lower right longitudinal positioning rod 2, a plurality of horizontal bars 3 are connected between the upper left longitudinal positioning rod 2 and the upper right longitudinal positioning rod 2, and a plurality of horizontal bars 4 are connected between the upper left longitudinal positioning rod 1 and the upper right longitudinal positioning rod 1; the plurality of stirrups 1 and the plurality of stirrups 2 are longitudinally arranged at intervals from left to right, and the plurality of horizontal bars 1, the plurality of horizontal bars 2, the plurality of horizontal bars 3 and the plurality of horizontal bars 4 are transversely arranged at intervals from front to back.

Preferably, a plurality of horizontal rib positioning holes are provided on the upper left longitudinal positioning rod 1, the upper right longitudinal positioning rod 1, the upper left longitudinal positioning rod 2, the upper right longitudinal positioning rod 2, the lower left longitudinal positioning rod 1, the lower right longitudinal positioning rod 1, the lower left longitudinal positioning rod 2 and the lower right longitudinal positioning rod 2.

Preferably, a plurality of stirrup positioning holes are provided on the transverse positioning rod one and the transverse positioning rod two.

Preferably, it also includes an end positioning rod, which is connected to the support rod between the rear end of the upper frame and the rear end of the lower frame, and the rear end of the stirrup one and the rear end of the stirrup two are both connected to the end positioning rod.

Preferably, the upper left longitudinal positioning rod 1, upper right longitudinal positioning rod 1, upper left longitudinal positioning rod 2, upper right longitudinal positioning rod 2, lower left longitudinal positioning rod 1, lower right longitudinal positioning rod 1, transverse positioning rod 1, lower left longitudinal positioning rod 2, lower right longitudinal positioning rod 2, transverse positioning rod 2 and end positioning rod are all angle steels.

Preferably, the plurality of stirrups 1 and the plurality of stirrups 2 are placed in the direction of the actual bottom plate slope.

Beneficial effects of the utility model:

1. The variable-section cast-in-place box girder web steel bar prefabricated cradle provided by the utility model comprises an upper frame, a lower frame and support rods. The upper frame is connected to the lower frame through a plurality of support rods, and the web steel bar (hoops and horizontal bars) binding operation is optimized from vertical operation to ground horizontal operation, which greatly reduces the construction risk. After assembly at a designated position such as a bridge deck or the ground, the web steel bar binding operation is carried out. After the web steel bar binding is completed, the variable-section cast-in-place box girder web steel bar prefabricated cradle itself can be used as a rigid skeleton. The operating personnel can use the lifting equipment to synchronously lift the bound variable-section cast-in-place box girder web steel bar prefabricated cradle to the web steel bar installation position for installation, thereby saving construction time and optimizing the construction efficiency of the steel bar binding operation.

2. The prefabricated web reinforcement frame of the variable-section cast-in-place box beam provided by the utility model has various components mechanically connected by bolts, which is convenient for installation and removal of the components and for the removal of the web reinforcement. The positions of the various components can be adjusted at will to adapt to different arrangements of web reinforcements of the variable-section box beam. The installation quality of the web reinforcements is controllable, and the convenient adjustment improves the construction quality. By prefabricating the web reinforcements, the cantilever construction of the main beam is changed from a flow operation to a parallel operation, which greatly improves the construction efficiency and effectively shortens the construction period.

BRIEF DESCRIPTION OF THE DRAWINGS

The utility model will be further described in detail below with reference to the accompanying drawings.

FIG1 is a top view of a prefabricated steel frame structure for a web of a variable-section cast-in-place box girder;

Fig. 2 is a right side view of Fig. 1;

Fig. 3 is a front view of Fig. 1;

FIG4 is a top view of the structure of positioning cross bars 1, 2 and the end positioning bar;

FIG. 5 is a schematic diagram of the structure of the connection between the lower left longitudinal positioning rod 1 and the transverse positioning rod 1. FIG.

Description of reference numerals: 1, upper frame; 2, lower frame; 3, support rod; 4, stirrup 1; 5, stirrup 2; 6, end positioning rod;

11. One upper frame; 111. One upper left longitudinal positioning rod; 112. One upper right longitudinal positioning rod; 113. Four horizontal ribs;

12. Upper frame body 2; 121. Upper left longitudinal positioning rod 2; 122. Upper right longitudinal positioning rod 2; 123. Horizontal rib 3;

21. A lower frame; 211. A lower left longitudinal positioning rod; 212. A lower right longitudinal positioning rod; 213. A transverse positioning rod; 214. A horizontal rib;

22. Lower frame body 2; 221. Lower left longitudinal positioning rod 2; 222. Lower right longitudinal positioning rod 2; 223. Transverse positioning rod 2; 224. Horizontal rib 2;

2141. Horizontal reinforcement positioning hole; 41. Stirrup reinforcement positioning hole.

Detailed ways

Embodiment 1:

As shown in Figures 1 to 5, a variable-section cast-in-place box girder web steel bar prefabricated frame includes an upper frame 1, a lower frame 2 and support rods 3. The upper frame 1 is connected to the lower frame 2 through a plurality of support rods 3, and the upper frame 1 is located above the lower frame 2.

The variable-section cast-in-place box girder web steel bar prefabricated cradle is assembled into a variable-section cast-in-place box girder through the upper frame 1, the lower frame 2 and the support rod 3. After being assembled at a designated position such as a bridge deck or the ground, the web steel bar binding operation is carried out. After the web steel bar binding is completed, the variable-section cast-in-place box girder web steel bar prefabricated cradle itself can be used as a rigid skeleton. The operating personnel can use the lifting equipment to synchronously lift the bound variable-section cast-in-place box girder web steel bar prefabricated cradle to the web steel bar installation position for installation, thereby optimizing the web steel bar binding operation from vertical operation to ground horizontal operation, greatly reducing the construction risk.

Embodiment 2:

On the basis of Embodiment 1, the upper shelf 1 comprises an upper shelf body 11 and an upper shelf body 2 12, and the upper shelf body 11 is located above the upper shelf body 2 12;

The upper frame body 11 includes an upper left longitudinal positioning rod 111 and an upper right longitudinal positioning rod 112, and the upper left longitudinal positioning rod 111 and the upper right longitudinal positioning rod 112 are longitudinally arranged from left to right with intervals;

The upper frame body 12 includes an upper left longitudinal positioning rod 121 and an upper right longitudinal positioning rod 122. The upper left longitudinal positioning rod 121 and the upper right longitudinal positioning rod 122 are longitudinally arranged with intervals from left to right.

The upper left longitudinal positioning rod 111 and the upper right longitudinal positioning rod 112, the upper left longitudinal positioning rod 2 121 and the upper right longitudinal positioning rod 2 122 play the role of positioning support for the horizontal reinforcement, and can play the role of connecting stirrups without using a transverse positioning rod, saving materials. The size and distance distribution of each component in the upper frame 1 are set according to actual conditions to meet actual requirements, with a simple structure and strong operability. At the same time, the upper left longitudinal positioning rod 111 and the upper right longitudinal positioning rod 112 are convenient for lifting.

Preferably, the lower shelf 2 includes a lower shelf body 1 21 and a lower shelf body 22, and the lower shelf body 1 21 is located below the lower shelf body 22;

The lower frame 21 includes a lower left longitudinal positioning rod 211, a lower right longitudinal positioning rod 212 and a transverse positioning rod 213, and the front end of the lower left longitudinal positioning rod 211 and the front end of the lower right longitudinal positioning rod 212, and the rear part of the lower left longitudinal positioning rod 211 and the rear part of the lower right longitudinal positioning rod 212 are connected by the transverse positioning rod 213;

The lower frame body 22 includes a lower left longitudinal positioning rod 221, a lower right longitudinal positioning rod 222 and a transverse positioning rod 223. The lower left longitudinal positioning rod 221 and the lower right longitudinal positioning rod 222 are connected by multiple transverse positioning rods 223. The multiple transverse positioning rods 223 are horizontally arranged from front to back with intervals. The multiple transverse positioning rods 223 are located between the two transverse positioning rods 213 of the lower frame body 1 21.

The lower left longitudinal positioning rod 1 211 and the lower right longitudinal positioning rod 1 212, the lower left longitudinal positioning rod 221 and the lower right longitudinal positioning rod 222 play a role of positioning support for the horizontal reinforcement, and the transverse positioning rod 1 213 and the transverse positioning rod 223 play a role of positioning support for the stirrups. The size and distance distribution of each component in the lower frame 2 are set according to actual conditions to meet actual requirements, with a simple structure and strong operability.

Preferably, the upper left longitudinal positioning rod 111, the upper left longitudinal positioning rod 2 121, the lower left longitudinal positioning rod 1 211 and the lower left longitudinal positioning rod 2 221 are connected by a group of multiple support rods 3, and the upper right longitudinal positioning rod 1 112, the upper right longitudinal positioning rod 2 122, the lower right longitudinal positioning rod 1 212 and the lower right longitudinal positioning rod 2 222 are connected by another group of multiple support rods 3, and the multiple support rods 3 are vertically arranged at intervals from front to back.

This connection method avoids setting the support rod 3 between the horizontal positioning rod 1 213 and the horizontal positioning rod 223, and the support rod 3 can be used to connect and support the upper frame 1 and the lower frame 2. The size, number, distance and distribution of the support rod 3 are set according to actual conditions to meet actual requirements. It has a simple structure, saves materials, and has strong stability and operability.

Preferably, the variable-section cast-in-place box girder web steel prefabricated tire frame also includes stirrup 14, stirrup 25, horizontal reinforcement 1 214, horizontal reinforcement 224, horizontal reinforcement 3 123 and horizontal reinforcement 4 113, stirrup 14 and stirrup 25 are all in a closed loop shape, the transverse positioning rod 1 213, the lower part of stirrup 14, horizontal reinforcement 1 214, transverse positioning rod 223, the lower part of stirrup 25, horizontal reinforcement 224, horizontal reinforcement 3 123, the upper part of stirrup 14, horizontal reinforcement 4 113 and the upper part of stirrup 25 are distributed from bottom to top in sequence, the lower parts of multiple stirrups 4 are connected between the two transverse positioning rods 1 213, and the lower left longitudinal positioning rod 1 211 and the lower right longitudinal positioning rod 1 212 are connected. A plurality of horizontal ribs 1 214 are connected, the lower parts of a plurality of stirrups 2 5 are connected between a plurality of transverse positioning rods 2 223, a plurality of horizontal ribs 224 are connected between the lower left longitudinal positioning rod 2 221 and the lower right longitudinal positioning rod 2 222, a plurality of horizontal ribs 3 123 are connected between the upper left longitudinal positioning rod 2 121 and the upper right longitudinal positioning rod 2 122, and a plurality of horizontal ribs 4 113 are connected between the upper left longitudinal positioning rod 1 111 and the upper right longitudinal positioning rod 1 112; the plurality of stirrups 1 4 and the plurality of stirrups 2 5 are longitudinally arranged at intervals from left to right, and the plurality of horizontal ribs 1 214, the plurality of horizontal ribs 224, the plurality of horizontal ribs 3 123 and the plurality of horizontal ribs 4 113 are transversely arranged at intervals from front to back.

This setting realizes the binding of the lower part of stirrup 14 and horizontal reinforcement 1 214, the binding of the lower part of stirrup 25 and horizontal reinforcement 224, the binding of the upper part of stirrup 14 and horizontal reinforcement 3 123, and the binding of the upper part of stirrup 25 and horizontal reinforcement 4 113.

Preferably, a plurality of horizontal rib positioning holes 2141 are provided on the upper left longitudinal positioning rod 111, the upper right longitudinal positioning rod 112, the upper left longitudinal positioning rod 2 121, the upper right longitudinal positioning rod 2 122, the lower left longitudinal positioning rod 1 211, the lower right longitudinal positioning rod 1 212, the lower left longitudinal positioning rod 2 221 and the lower right longitudinal positioning rod 2 222.

The horizontal reinforcement positioning holes 2141 are used to realize the positioning support of the stirrup 1 4 and the stirrup 2 5. In actual operation, the number and distribution of the horizontal reinforcement positioning holes 2141 are set according to actual conditions to meet actual requirements.

Preferably, a plurality of stirrup positioning holes 41 are provided on the transverse positioning rod 1 213 and the transverse positioning rod 223 .

The stirrup positioning holes 41 are used to achieve positioning support for the horizontal reinforcement on the corresponding frame. In actual operation, the number and distribution of the stirrup positioning holes 41 are set according to actual conditions to meet actual requirements.

Preferably, the upper left longitudinal positioning rod 111, the upper right longitudinal positioning rod 112, the upper left longitudinal positioning rod 2 121, the upper right longitudinal positioning rod 2 122, the lower left longitudinal positioning rod 1 211, the lower right longitudinal positioning rod 1 212, the transverse positioning rod 1 213, the lower left longitudinal positioning rod 221, the lower right longitudinal positioning rod 222, the transverse positioning rod 223 and the end positioning rod 6 are all angle steels.

Angle steel is easy to connect and punch, easy to obtain and connect, and economical and practical.

Preferably, the plurality of stirrups 1 4 and the plurality of stirrups 2 5 are placed in the direction of the actual bottom plate slope.

To adapt to the installation of slope web reinforcement in variable sections.

Preferably, it also includes an end positioning rod 6, which is connected to the support rod 3 between the rear end of the upper frame 1 and the rear end of the lower frame 2, and the rear ends of stirrup 1 4 and stirrup 2 5 are both connected to the end positioning rod 6.

The end positioning rod 6 is mainly used to position the top of the stirrup according to the longitudinal slope of the bridge deck, and the angle of the end positioning rod 6 is adjusted according to the slope of the web reinforcement of the current block section to ensure the slope of the reinforcement. The advantage of this method is that it can adapt to the slope of the web reinforcement of different blocks and sections, and the slope of the reinforcement can be flexibly adjusted. When the size of the stirrup or horizontal reinforcement changes, the distance between the positioning rods (upper left longitudinal positioning rod 111, upper right longitudinal positioning rod 112, upper left longitudinal positioning rod 2 121, upper right longitudinal positioning rod 2 122, lower left longitudinal positioning rod 1 211, lower right longitudinal positioning rod 1 212, transverse positioning rod 1 213, lower left longitudinal positioning rod 2 221, lower right longitudinal positioning rod 2 222, transverse positioning rod 2 223 and the end positioning rod 6) is adjusted, and it is re-fixed on the support rod 3 to complete the adjustment of the positioning of the stirrup and the horizontal reinforcement. When installing stirrups 1 4 and stirrups 2 5, the end of the rear end of each stirrup 1 4 and stirrup 2 5 should be connected to the end positioning rod 6, and stirrups 1 4 and stirrups 2 5 should be placed in the direction of the actual bottom plate slope.

Preferably, the horizontal reinforcement positioning holes 2141 and the stirrup positioning holes 41 are both grooves.

That is, the upper left longitudinal positioning rod 111, the upper right longitudinal positioning rod 112, the upper left longitudinal positioning rod 2 121, the upper right longitudinal positioning rod 2 122, the lower left longitudinal positioning rod 1 211, the lower right longitudinal positioning rod 1 212, the lower left longitudinal positioning rod 221, the lower right longitudinal positioning rod 222, the transverse positioning rod 1 213, the transverse positioning rod 223 and the end positioning rod 6 are all comb-tooth type, that is, a small groove with an opening slightly larger than the diameter of the steel bar and a depth of three-fifths of the steel bar diameter is set on one side of the angle steel.

Preferably, the support rod 3 is respectively connected to the upper left longitudinal positioning rod 111, the upper right longitudinal positioning rod 112, the upper left longitudinal positioning rod 2 121, the upper right longitudinal positioning rod 2 122, the lower left longitudinal positioning rod 1 211, the lower right longitudinal positioning rod 1 212, the lower left longitudinal positioning rod 2 221, the lower right longitudinal positioning rod 2 222 and the end positioning rod 6; the transverse positioning rod 1 213 is respectively connected to the lower left longitudinal positioning rod 1 211, the lower right longitudinal positioning rod 1 212; the transverse positioning rod 223 is respectively connected to the lower left longitudinal positioning rod 2 221 and the lower right longitudinal positioning rod 2 222 by bolts. The bolt connection is convenient for installation and disassembly and is convenient for construction.

Specifically, the intersections of the horizontal bars with the longitudinal bars and the vertical bars are made by welding steel plates at the ends of the horizontal bars and opening bolt holes on the steel plates, and bolt holes are directly opened at the corresponding positions of the longitudinal bars and the vertical bars; the intersections of the longitudinal bars with the vertical bars are made by welding steel plates at the ends of the longitudinal bars and opening bolt holes, and bolt holes are directly opened at the corresponding positions of the vertical bars; the entire tire frame is bolted.

Preferably, the beam section vertical prestressed steel rod and the longitudinal prestressed corrugated pipe are connected between the upper frame 1 and the lower frame 2. The beam section vertical prestressed steel rod and the longitudinal prestressed corrugated pipe can be connected according to the actual position, thereby reducing the workload during vertical work.

Embodiment 3:

Based on Example 2, a method for using a prefabricated tire frame for web steel bars of a variable-section cast-in-place box beam is as follows:

During assembly: the following steps are included: first, install the lower left longitudinal positioning rod 211, the lower right longitudinal positioning rod 212 and the transverse positioning rod 213 in the lower frame 21; connect the lower left longitudinal positioning rod 221 through the support rod 3 above the lower left longitudinal positioning rod 211, and connect the lower right longitudinal positioning rod 222 through the support rod 3 above the lower right longitudinal positioning rod 212; connect the end positioning rod 6 through the support rod 3 above the rear end of the lower frame 22 (as shown in FIG. 1); then connect the upper left longitudinal positioning rod 211 through the support rod 3 above the lower left longitudinal positioning rod 211, and connect the upper right longitudinal positioning rod 212 through the support rod 3 above the lower right longitudinal positioning rod 212; connect the upper left longitudinal positioning rod 121 through the support rod 3 above the upper left longitudinal positioning rod 121 111, connect the upper right longitudinal positioning rod 112 through the support rod 3 above the upper right longitudinal positioning rod 222; install the stirrup 14 on the transverse positioning rod 1 213, connect the transverse positioning rod 223 between the lower left longitudinal positioning rod 221 and the lower right longitudinal positioning rod 222, and install the stirrup 25 on the transverse positioning rod 223; finally, connect the horizontal reinforcement 1 214 between the lower left longitudinal positioning rod 1 211 and the lower right longitudinal positioning rod 1 212, connect the horizontal reinforcement 224 between the lower left longitudinal positioning rod 221 and the lower right longitudinal positioning rod 222, connect the horizontal reinforcement 3 123 between the upper left longitudinal positioning rod 2 121 and the upper right longitudinal positioning rod 2 122, and connect the horizontal reinforcement 4 113 between the upper left longitudinal positioning rod 1 111 and the upper right longitudinal positioning rod 1 112; complete the assembly.

Prestressed and embedded parts can be installed in a timely manner according to actual conditions.

During disassembly, the rods close to the ends of the cast beam sections can be released from constraints and disassembled one by one, and the remaining parts can be removed as a whole from the prefabricated steel bar block segments and hoisted to the ground.

Rebar installation: After assembly is completed, the assembled prefabricated tire frame is hoisted to the target location using a hoist.

The utility model can realize the prefabrication of horizontal reinforcements for different webs by adjusting the number of layers and the spacing of the longitudinal positioning rods of each layer, and can realize the prefabrication of stirrups for different webs by adjusting the number of layers and the spacing of the transverse positioning rods of each layer; according to the actual situation, "U"-shaped positioning bars can be added to position the prestressing force, embedded parts, etc. It effectively solves the problem of difficult steel bar binding caused by vertical operation in the construction of traditional variable-section box girders, effectively ensures the accuracy of the steel bar spacing, and ensures the construction quality. The utility model can be used as a hoisting rigid skeleton while serving as a positioning skeleton, eliminating the deformation of the steel bar block segment caused by the oversize of the prefabricated steel bar during hoisting, and ensuring the safety of hoisting. Compared with the traditional steel bar prefabricated skeleton, the steel bar prefabricated skeleton of the present application has large rigidity and stable structure, and can be used as a steel bar hoisting rigid skeleton. The connection between each component is a mechanical connection, and the position of the component can be adjusted at will, which is relatively convenient, enhances its adaptability to the variable-section box girder and is easy to install and disassemble. The rods of the overall structure can be numbered and reused, reducing material investment.

In the description of the present invention, it should be understood that the terms "left", "inside", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations on the present invention.

The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a prefabricated bed-jig of cast-in-place case girder web reinforcing bar of variable cross-section which characterized in that: the device comprises an upper layer frame (1), a lower layer frame (2) and supporting rods (3), wherein the upper layer frame (1) is connected with the lower layer frame (2) through the supporting rods (3), and the upper layer frame (1) is located above the lower layer frame (2).

2. The variable cross-section cast-in-place box girder web reinforcement prefabricated jig of claim 1, wherein: the upper layer frame (1) comprises an upper frame body I (11) and an upper frame body II (12), and the upper frame body I (11) is positioned above the upper frame body II (12);

the upper frame body I (11) comprises an upper left longitudinal positioning rod I (111) and an upper right longitudinal positioning rod I (112), and the upper left longitudinal positioning rod I (111) and the upper right longitudinal positioning rod I (112) are longitudinally arranged at intervals from left to right;

the upper frame body II (12) comprises an upper left longitudinal positioning rod II (121) and an upper right longitudinal positioning rod II (122), and the upper left longitudinal positioning rod II (121) and the upper right longitudinal positioning rod II (122) are longitudinally arranged at intervals from left to right.

3. The variable cross-section cast-in-situ box girder web reinforcement prefabricated jig of claim 2, wherein:

The lower layer frame (2) comprises a first lower frame body (21) and a second lower frame body (22), and the first lower frame body (21) is positioned below the second lower frame body (22);

The lower frame body I (21) comprises a lower left longitudinal positioning rod I (211), a lower right longitudinal positioning rod I (212) and a transverse positioning rod I (213), wherein the front end of the lower left longitudinal positioning rod I (211) is connected with the front end of the lower right longitudinal positioning rod I (212), and the rear part of the lower left longitudinal positioning rod I (211) is connected with the rear part of the lower right longitudinal positioning rod I (212) through the transverse positioning rod I (213);

the lower frame body II (22) comprises a lower left longitudinal positioning rod II (221), a lower right longitudinal positioning rod II (222) and a transverse positioning rod II (223), the lower left longitudinal positioning rod II (221) is connected with the lower right longitudinal positioning rod II (222) through a plurality of transverse positioning rods II (223), the transverse positioning rods II (223) are transversely arranged at intervals from front to back, and the transverse positioning rods II (223) are positioned between the two transverse positioning rods I (213) of the lower frame body I (21).

4. A variable cross-section cast-in-place box girder web reinforcement prefabricated jig as claimed in claim 3, wherein: the upper left longitudinal positioning rod I (111), the upper left longitudinal positioning rod II (121), the lower left longitudinal positioning rod I (211) and the lower left longitudinal positioning rod II (221) are connected through a plurality of support rods (3), the upper right longitudinal positioning rod I (112), the upper right longitudinal positioning rod II (122), the lower right longitudinal positioning rod I (212) and the lower right longitudinal positioning rod II (222) are connected through another plurality of support rods (3), and the plurality of support rods (3) are vertically arranged at intervals from front to back.

5. The variable cross-section cast-in-situ box girder web reinforcement prefabricated jig of claim 4, wherein: the variable cross-section cast-in-situ box girder web steel bar prefabrication jig frame further comprises a first stirrup (4), a second stirrup (5), a fourth horizontal stirrup (214), a second horizontal stirrup (224), a third horizontal stirrup (123) and a fourth horizontal stirrup (113), wherein the first stirrup (4) and the second stirrup (5) are in closed loop shapes, the first transverse positioning rod (213), the lower part of the first stirrup (4), the first horizontal stirrup (214), the second transverse positioning rod (223), the lower part of the second stirrup (5), the second horizontal stirrup (224), the third horizontal stirrup (123), the upper part of the first stirrup (4), the fourth horizontal stirrup (113) and the upper part of the second stirrup (5) are sequentially distributed from bottom to top, the lower part of the first horizontal stirrup (123) is connected between the two transverse positioning rods (213), the lower part of the first horizontal stirrup (214) is connected between the first lower left longitudinal positioning rod (211) and the first lower right longitudinal positioning rod (212), the lower part of the second stirrup (5) is connected between the second transverse positioning rod (223), the upper part of the second stirrup (122) is connected between the second longitudinal positioning rod (221) and the second longitudinal positioning rod (122), a plurality of horizontal ribs IV (113) are connected between the upper left longitudinal positioning rod I (111) and the upper right longitudinal positioning rod I (112); the first stirrups (4) and the second stirrups (5) are longitudinally arranged at intervals from left to right, and the first horizontal stirrups (214), the second horizontal stirrups (224), the third horizontal stirrups (123) and the fourth horizontal stirrups (113) are transversely arranged at intervals from front to back.

6. The variable cross-section cast-in-situ box girder web reinforcement prefabricated jig of claim 5, wherein: the upper left longitudinal positioning rod I (111), the upper right longitudinal positioning rod I (112), the upper left longitudinal positioning rod II (121), the upper right longitudinal positioning rod II (122), the lower left longitudinal positioning rod I (211), the lower right longitudinal positioning rod I (212), the lower left longitudinal positioning rod II (221) and the lower right longitudinal positioning rod II (222) are provided with a plurality of horizontal rib positioning holes (2141).

7. The variable cross-section cast-in-place box girder web reinforcement prefabricated jig of claim 6, wherein: a plurality of stirrup positioning holes (41) are formed in the first transverse positioning rod (213) and the second transverse positioning rod (223).

8. The variable cross-section cast-in-place box girder web reinforcement prefabricated jig of claim 7, wherein: the novel multifunctional support frame further comprises an end positioning rod (6), wherein the end positioning rod (6) is connected to a support rod (3) between the rear end of the upper layer frame (1) and the rear end of the lower layer frame (2), and the rear ends of the stirrups I (4) and II (5) are both connected with the end positioning rod (6).

9. The variable cross-section cast-in-place box girder web reinforcement prefabricated jig of claim 8, wherein: the upper left longitudinal locating rod I (111), the upper right longitudinal locating rod I (112), the upper left longitudinal locating rod II (121), the upper right longitudinal locating rod II (122), the lower left longitudinal locating rod I (211), the lower right longitudinal locating rod I (212), the transverse locating rod I (213), the lower left longitudinal locating rod II (221), the lower right longitudinal locating rod II (222), the transverse locating rod II (223) and the end locating rod (6) are all angle steels.

10. The variable cross-section cast-in-place box girder web reinforcement prefabricated jig of claim 9, wherein: the stirrups I (4) and the stirrups II (5) are placed according to the direction of the actual bottom plate gradient.