CN215289720U

CN215289720U - Cast-in-place box girder formwork structure of wide body reservation post-cast strip of large-span

Info

Publication number: CN215289720U
Application number: CN202120806114.0U
Authority: CN
Inventors: 董亚; 蒋新春; 鲁江; 祁涛; 刘尚; 蔡继康; 章俊; 郑州
Original assignee: Zhejiang Jinzhu Transportation Construction Co Ltd
Current assignee: Zhejiang Jinzhu Transportation Construction Co Ltd
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2021-12-24
Anticipated expiration: 2031-04-20

Abstract

The utility model relates to a large-span wide body reserved post-cast-in-place box girder formwork structure, which comprises a reserved post-cast strip, a box girder poured section, a suspension hanging beam, a first supporting pier, a second supporting pier, a box girder inner mold and a box girder outer mold; arranging a box girder reinforcement cage at the positions of the reserved post-cast strip and the poured section of the box girder; the cast sections of the box girder are positioned on two sides of the reserved post-cast strip. The utility model has the advantages that: the sliding hanging beam is arranged between the hanging beam supporting columns on the two sides of the reserved post-cast strip, and the template hanging rod is arranged on the sliding hanging beam, so that the difficulty of supporting construction of the box beam outer mold can be effectively reduced; the transverse pressing body is used for applying transverse top pressure to the upper pre-pressing beam and the lower pre-pressing beam, so that the difficulty of top pressure construction of the reserved post-pouring strip can be effectively reduced; an inner support positioning body is arranged between the assembly inner bottom die and the assembly inner top die, so that the difficulty in mounting and positioning the box girder inner die is reduced; the efficiency of getting rid of the air in the concrete pouring process has been promoted, the pouring quality of reserving post-cast strip concrete has been improved.

Description

Cast-in-place box girder formwork structure of wide body reservation post-cast strip of large-span

Technical Field

The utility model relates to a can improve the quality that the concrete poured, improve on-the-spot efficiency of construction's large-span wide body and reserve cast-in-place box girder formwork structure in post-cast zone, be applicable to cast-in-place box girder template system construction among the bridge engineering.

Background

With the development of large-span continuous bridge in China, the bridge structure system is increasingly complex. When a cast-in-place box girder is constructed, a certain number of post-cast strips are often required to be arranged for reducing the influence of temperature load on a box girder structure. When the reserved post-cast strip is used for subsequent construction, efficient post-cast strip capping and reliable concrete pouring are often the key points and difficulties of site construction.

There has been the convenient construction support of no support in cast-in-place box girder span of bridge among the prior art, its characterized in that: construction support body and work platform, construction support body lower extreme fixed surface is equipped with a plurality of base, and the fixed a plurality of sleeve that is equipped with in construction support body upper end, the inside sliding of sleeve is equipped with the sliding block, and fixed surface is equipped with the dead lever under the sliding block, and dead lever one end is fixed and is equipped with the universal wheel, and the universal wheel upper end is equipped with the spring, and the base of bottom provides the outrigger. Through lowering work platform, make the inserted bar insert the inside sliding block that drives of sleeve and slide downwards inside the sleeve to stretch out construction support body lower extreme with the universal wheel through the dead lever, along with the effort of lead screw will be under construction support body jack-up, thereby conveniently construct the removal of support body and shift, the spring can drive the universal wheel when the inserted bar breaks away from the sleeve and receive inside the construction support body. Although the construction method solves the stability problem of the formwork supporting system and can facilitate the layout of the formwork supporting system to a certain degree, the construction method has improvements in the aspects of reducing the difficulty in installing and positioning the formwork, improving the compactness of the concrete of the reserved post-cast strip and the like.

In view of this, in order to effectively reduce the on-site construction difficulty of the large-span wide-body reserved post-cast-in-place box girder formwork system, improve the construction quality, and protect the surrounding environment, the invention is urgently needed to provide the large-span wide-body reserved post-cast-in-place box girder formwork structure which can not only reduce the on-site construction difficulty, improve the compactness of the reserved post-cast-in-place concrete, but also effectively improve the construction efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough among the prior art, provide one kind not only can effectively reduce the box girder external mold and prop up the degree of difficulty of establishing the construction, promote the closely knit degree of reserving post-cast strip concrete, the wide body of large-span that can effectively improve the efficiency of construction moreover reserves post-cast strip box girder formwork structure.

The large-span wide body reserved post-cast-in-place box girder formwork structure comprises a reserved post-cast strip, a box girder poured section, a suspension hanging beam, a first support pier, a second support pier, a box girder inner mold and a box girder outer mold;

arranging a box girder reinforcement cage at the positions of the reserved post-cast strip and the poured section of the box girder, wherein the poured section of the box girder is positioned at two sides of the reserved post-cast strip; hanging beam supporting columns are respectively arranged on two sides of the reserved post-cast strip, and a sliding hanging beam is arranged between the hanging beam supporting columns on the two sides of the reserved post-cast strip; a hanging beam connecting groove with a T-shaped cross section is arranged on the side of the hanging beam support column facing the sliding hanging beam, and the sliding hanging beam and the hanging beam connecting groove are connected through a hanging beam connecting plate; a template hanging rod is arranged on the sliding hanging beam, and a hanging beam is arranged at the bottom end of the template hanging rod; the upper surface and the lower surface of one side of the reserved post-cast strip are respectively provided with a first support pier, and the upper surface and the lower surface of the other side of the reserved post-cast strip are respectively provided with a second support pier; reinforcing support bodies are respectively arranged on the sides of the first support pier and the second support pier, which deviate from the reserved post-cast strip; an upper pre-pressing beam and a transverse pressing body are arranged between the first supporting pier and the second supporting pier on the upper surface of the reserved post-cast strip, and a lower pre-pressing beam and a transverse pressing body are arranged between the first supporting pier and the second supporting pier on the lower surface of the reserved post-cast strip;

the assembly inner side die, the assembly inner bottom die and the assembly inner top die are combined to form a box girder inner die which is arranged inside the reserved post-pouring strip, an inner support positioning body is arranged between the opposite assembly inner top die and the assembly inner bottom die, and inner die connecting plates and inner die splicing seams are arranged at the joints of the assembly inner side die and the assembly inner bottom die and the joints of the assembly inner side die and the assembly inner top die; two ends of the inner supporting and positioning body are respectively connected with the assembly inner bottom die and the assembly inner top die through inner supporting press plates; sequentially laying a template pad beam and a box beam outer mold on the suspension beams opposite to each other in a mirror image manner, arranging a template buttress on the upper surface of the suspension beam, arranging a vertical support rod and a rotary support rod on the side of the template buttress facing the box beam outer mold, and arranging a template pressing plate at the joint of the vertical support rod and the rotary support rod with the box beam outer mold; concrete is poured into a cavity formed by enclosing the box girder inner mold and the box girder outer mold and above the box girder inner mold and the box girder outer mold to form a box girder post-pouring belt.

Preferably, the method comprises the following steps: the first support pier and the second support pier are both formed by rolling profile steel and are connected with the reinforcing support body in a welding mode; the first support pier is connected with the upper pre-pressing beam or the lower pre-pressing beam through the transverse pressurizing body; the second support pier is connected with the upper pre-pressing beam and the lower pre-pressing beam in a welding mode; the transverse pressurizing body adopts a hydraulic jack, one end of the transverse pressurizing body is connected with the first supporting pier in a welding mode, and the other end of the transverse pressurizing body is connected with the upper pre-pressing beam or the lower pre-pressing beam which is connected with the transverse pressurizing body in a welding mode.

Preferably, the method comprises the following steps: the vertical support rod comprises a nut and a screw rod, the fastening directions of the screw rods on the two sides of the nut are opposite, and the two ends of the screw rod are respectively connected with the template buttress and the template pressing plate in a welding manner; the rotary support rod comprises a nut and screws, the fastening directions of the screws on the two sides of the nut are opposite, one end of the screw is connected with the template pressing plate in a welding mode, and the other end of the screw is connected with the template buttress through a support rod rotary hinge; the assembly inner side die, the assembly inner bottom die and the assembly inner top die are all prefabricated concrete templates and are connected with the box girder steel reinforcement cage through template positioning ribs; the bottom plate of the assembled inner side mold is provided with a bag connecting pipe and is communicated with the slurry storage bag through the bag connecting pipe; the grout storage bag is formed by sewing rubber sheets, and the elevation of the bottom surface is 10-30 mm higher than that of the top surface of the second filling pipe; the box girder outer mold adopts an alloy template, a first filling pipe and a second filling pipe are respectively arranged on the side plates, and the first filling pipe and the second filling pipe are respectively communicated with external concrete filling equipment.

The utility model has the advantages that:

(1) the utility model discloses set up between the string roof beam brace of reserving post-cast strip both sides and slide and hang the roof beam to set up the template jib on sliding and hanging the roof beam, can effectively reduce the degree of difficulty that the construction was established to the case roof beam external mold.

(2) The utility model discloses the upper surface and the lower surface of water area all set up first support mound and second support mound after reserving to exert horizontal roof pressure through horizontal pressurization body to upper portion prestressing beam and lower part prestressing beam, can effectively reduce the degree of difficulty of reserving the construction of water area roof pressure after reserving.

(3) The utility model discloses the case roof beam centre form adopts the reinforced concrete prefabricated plate, top mould in die block and the spelling in the inner die mould of spelling, spelling to set up the internal stay location body between the top mould in die block and the spelling in the spelling, reduced the degree of difficulty of case roof beam centre form installation location.

(4) The utility model discloses set up the bag connecting pipe on the bottom plate of spelling inside form to remaining thick liquid of storage and air are stayed with the storage thick liquid bag to the bag connecting pipe, have promoted the efficiency of getting rid of the air of concrete pouring in-process, have improved the pouring quality of reserving post-cast strip concrete.

Drawings

FIG. 1 is a schematic structural view of a formwork of a large-span wide-body reserved post-cast-in-place box girder of the utility model;

FIG. 2 is a schematic diagram of the arrangement and concrete pouring structure of the reserved post-cast strip formwork of FIG. 1;

fig. 3 is a schematic view of the connection inside the cast section of the box girder.

Description of reference numerals: 1-box girder reinforcement cage; 2-a box girder poured section; 3, reserving a post-pouring belt; 4-hanging beam and brace columns; 5, slipping and hanging the beam; 7-a template boom; 8-hanging the hanging beam; 9-a first support pier; 10-a second support pier; 11-a reinforcing support; 12-upper pre-press beam; 13-a transverse compression body; 14-lower pre-press beam; 15-internal bracing and pressing plate; 16-assembling the inner side mold; 17-assembling the inner bottom die; 18-assembling an inner top die; 19-box girder inner mould; 20-internal supporting and positioning body; 21-an inner mold connecting plate; 22-inner mold splice seam; 23-template pad beam; 24-box girder external mold; 25-formwork buttress; 26-vertical struts; 27-rotating the stay bar; 28-a template platen; 29-a first infusion tube; 30-a second infusion tube; 31-plasma storage sachet; 32-stay bar rotation hinge; 33-template positioning ribs; 34-bladder connection tube; 35-hanging beam connecting plate; 36-hanging beam connecting grooves; 37-box girder post-cast strip.

Detailed Description

The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

As an embodiment, fig. 1 is the utility model discloses the cast-in-place case roof beam formwork structure schematic diagram of large-span wide body reservation post-cast strip, fig. 2 is fig. 1 reservation post-cast strip template and lays and concrete placement structure schematic diagram, and fig. 3 is the bottom die and the interior top formwork of spelling prop up in fig. 2 spelling. Referring to fig. 1 to 3, the large-span wide body reserved post-cast-in-place box girder formwork structure comprises a reserved post-cast strip 3, a box girder poured section 2, a suspension hanging beam 8, a first supporting pier 9, a second supporting pier 10, a box girder inner mold 19 and a box girder outer mold 24; arranging box girder reinforcement cages 1 at the positions of the reserved post-cast strip 3 and the box girder cast sections 2, and pouring concrete of the box girder cast sections 2 on two sides of the reserved post-cast strip 3; two sides of the reserved post-cast strip 3 are respectively provided with two hanging beam supporting columns 4, a sliding hanging beam 5 is arranged between the hanging beam supporting columns 4 at the two sides of the reserved post-cast strip 3, and two template hanging rods 7 are arranged on the sliding hanging beam 5; the upper surface and the lower surface of one side of the reserved post-cast strip 3 are respectively provided with two first supporting piers 9, the upper surface and the lower surface of the other side of the reserved post-cast strip 3 are respectively provided with two second supporting piers 10, and transverse jacking force is applied to the upper pre-pressing beam 12 and the lower pre-pressing beam 14 through a transverse pressurizing body 13; the box girder inner die 19 is made of a reinforced concrete precast slab and comprises an assembled inner side die 16, an assembled inner bottom die 17 and an assembled inner top die 18, an inner support positioning body 20 is arranged between the assembled inner bottom die 17 and the assembled inner top die 18, and vertical pressure is applied to the assembled inner top die 18 and the assembled inner bottom die 17 through the inner support positioning body 20; a bladder connecting pipe 34 is provided on the bottom plate of the assembled inner mold 16, and the bladder connecting pipe 34 and the slurry storage bladder 31 store residual slurry and air. The first pouring pipe 29 is used for pouring concrete into a cavity formed by the enclosing of the box girder inner mould 19 and the box girder outer mould 24, when the slurry storage bag 31 is filled with concrete, the second pouring pipe 30 is used for pouring concrete into the cavity formed by the enclosing of the box girder inner mould 19 and the box girder outer mould 24, and when the concrete is poured to the top surface elevation of the assembled inner top mould 18, the pouring of the box girder post-pouring belt 37 is completed through the external concrete pouring pipe.

The box girder steel reinforcement cage 1 is formed by binding threaded steel bars with the diameters of 32mm and 10 mm.

The width of the reserved post-cast strip 3 is 800mm, and the strength grade of concrete is C50.

The hanging beam support column 4 is formed by rolling a steel plate with the thickness of 10mm, is T-shaped in appearance and is 50cm high. The sliding hanging beam 5 is formed by rolling a steel plate with the thickness of 3mm, the width of the sliding hanging beam is 30cm, and the height of the sliding hanging beam is 10 cm. The hanging beam connecting plate 35 is formed by rolling a steel plate with the thickness of 10mm, the width of the steel plate is 10cm, and the height of the steel plate is 15 cm. The hanging beam connecting groove 36 is formed by rolling a steel plate with the thickness of 10mm, is 20cm high and is vertically welded and connected with the hanging beam support column 4.

The template hanger rods 7 are all made of steel pipes with the strength grade of Q345D and the specification of phi 200 multiplied by 10.

The suspension hanging beam 8 and the second hanging beam are both formed by rolling H-shaped steel with the specification of 300 multiplied by 150 multiplied by 6.5 multiplied by 9.

The first support pier 9 and the second support pier 10 are both formed by rolling H-shaped steel with the specification of 150 multiplied by 7 multiplied by 10, the height is 30cm, and the first support pier and the second support pier are connected with the reinforcing support body 11 in a welding mode; the first supporting pier 9 is connected with the upper pre-pressing beam 12 or the lower pre-pressing beam 14 through a transverse pressing body 13; the second support pier 10 is welded to the upper and lower pre-stressed

beams

12, 14.

The reinforcing support body 11 is formed by rolling a steel plate with the thickness of 10mm and is firmly anchored and connected with the cast section 2 of the box girder; the cast section 2 of the box girder is formed by casting concrete with the strength grade of C50.

The transverse pressurizing body 13 adopts a 50-ton hydraulic jack, one end of the transverse pressurizing body is connected with the first supporting pier 9 in a welding way, and the other end of the transverse pressurizing body is connected with the upper pre-pressing beam 12 or the lower pre-pressing beam 14 in a welding way; the upper pre-pressing beam 12 and the lower pre-pressing beam 14 are both rolled in an H shape with a specification of 150 × 150 × 7 × 10.

The inner supporting pressing plate 15 is formed by rolling a steel plate with the thickness of 10 mm.

The box girder inner mold 19 comprises an assembled inner side mold 16, an assembled inner bottom mold 17 and an assembled inner top mold 18, all of which adopt reinforced concrete precast slabs, the concrete strength grade is C50, and are connected with the box girder steel reinforcement cage 1 through template positioning ribs 33, and the template positioning ribs 33 adopt throat hoops with the width of 20 mm; the bottom plate of the assembled inner side die 16 is provided with a bag connecting pipe 34 which is communicated with the slurry storage bag 31 through the bag connecting pipe 34, and the bag connecting pipe 34 adopts a steel pipe with the diameter of 60 mm.

The plasma storage bag 31 is formed by sewing rubber sheets with the thickness of 1mm, and the elevation of the bottom surface is 20mm higher than that of the top surface of the second perfusion tube 30.

The inner support positioning body 20 adopts a hydraulic jack; the internal mold connecting plate 21 is formed by rolling a steel plate with the thickness of 2 mm; the inclination angle of the inner die splicing seam 22 is 45 degrees.

The template pad beam 23 is formed by rolling a steel plate with the thickness of 10 mm.

The box girder external mold 24 adopts a steel template with the thickness of 3mm, a first filling pipe 29 and a second filling pipe 30 are respectively arranged on the side plates, and the first filling pipe 29 and the second filling pipe 30 are respectively communicated with external concrete filling equipment; the first perfusion tube 29 and the second perfusion tube 30 are both made of steel tubes with the diameter of 100 mm.

The vertical support rod 26 is composed of a high-strength screw rod with the diameter of 60mm and a bolt, the fastening directions of the screw rods on the two sides of the nut are opposite, and the two ends of the screw rod are respectively connected with the template buttress 25 and the template pressing plate 28 in a welding mode. The formwork buttress 25 is formed by rolling a steel plate with the thickness of 2mm, and the formwork press plate 28 is formed by rolling a steel plate with the thickness of 10 mm.

The rotary stay bar 27 is composed of high-strength screws with the diameter of 60mm and bolts, the fastening directions of the screws on the two sides of the nut are opposite, one end of the rotary stay bar is connected with the template pressing plate 28 in a welding mode, the other end of the rotary stay bar is connected with the template buttress 25 through a stay bar rotary hinge 32, and the stay bar rotary hinge 32 is a spherical hinge with the diameter of 60 mm.

Claims

1. Cast-in-place box girder formwork structure in post-cast strip is reserved to large-span wide body, its characterized in that: the method comprises a reserved post-cast strip (3), a box girder cast section (2), a suspension hanging beam (8), a first support pier (9), a second support pier (10), a box girder inner mold (19) and a box girder outer mold (24);

a box girder reinforcement cage (1) is arranged at the positions of the reserved post-cast strip (3) and the box girder cast section (2), and the box girder cast section (2) is positioned at two sides of the reserved post-cast strip (3); hanging beam supporting columns (4) are respectively arranged on two sides of the reserved post-cast strip (3), and sliding hanging beams (5) are arranged between the hanging beam supporting columns (4) on the two sides of the reserved post-cast strip (3); a hanging beam connecting groove (36) with a T-shaped cross section is arranged on the side of the hanging beam support column (4) facing the sliding hanging beam (5), and the sliding hanging beam (5) is connected with the hanging beam connecting groove (36) through a hanging beam connecting plate (35); a template hanging rod (7) is arranged on the sliding hanging beam (5), and a hanging beam (8) is arranged at the bottom end of the template hanging rod (7); the upper surface and the lower surface of one side of the reserved post-cast strip (3) are respectively provided with a first support pier (9), and the upper surface and the lower surface of the other side of the reserved post-cast strip (3) are respectively provided with a second support pier (10); reinforcing support bodies (11) are respectively arranged on the sides of the first support pier (9) and the second support pier (10) departing from the reserved post-cast strip (3); an upper pre-pressing beam (12) and a transverse pressing body (13) are arranged between a first supporting pier (9) and a second supporting pier (10) on the upper surface of the reserved post-cast strip (3), and a lower pre-pressing beam (14) and a transverse pressing body (13) are arranged between the first supporting pier (9) and the second supporting pier (10) on the lower surface of the reserved post-cast strip (3);

a box girder inner mold (19) formed by combining the assembly inner side mold (16), the assembly inner bottom mold (17) and the assembly inner top mold (18) is arranged inside the reserved post-pouring belt (3), an inner support positioning body (20) is arranged between the assembly inner top mold (18) and the assembly inner bottom mold (17) which are opposite, and an inner mold connecting plate (21) and an inner mold splicing seam (22) are arranged at the joint of the assembly inner side mold (16) and the assembly inner bottom mold (17) and the joint of the assembly inner side mold (16) and the assembly inner top mold (18); two ends of the inner supporting and positioning body (20) are respectively connected with the assembly inner bottom die (17) and the assembly inner top die (18) through inner supporting pressure plates (15); sequentially laying a template pad beam (23) and a box beam outer mold (24) on the suspension hanging beam (8) which is opposite in mirror image, arranging a template buttress (25) on the upper surface of the suspension hanging beam (8), arranging a vertical stay bar (26) and a rotary stay bar (27) on the side of the template buttress (25) facing the box beam outer mold (24), and arranging a template pressing plate (28) at the joint of the vertical stay bar (26) and the rotary stay bar (27) and the box beam outer mold (24); concrete is poured into a cavity formed by enclosing the box girder inner mold (19) and the box girder outer mold (24) and above the box girder inner mold (19) and the box girder outer mold (24) to form a box girder post-cast strip (37).

2. The large-span wide body reserved post-cast-in-place box girder formwork structure of claim 1, characterized in that: the first support pier (9) and the second support pier (10) are both formed by rolling profile steel and are connected with the reinforcing support body (11) in a welding mode; the first supporting pier (9) is connected with the upper pre-pressing beam (12) or the lower pre-pressing beam (14) through a transverse pressing body (13); the second support pier (10) is connected with the upper pre-pressing beam (12) and the lower pre-pressing beam (14) in a welding mode; the transverse pressurizing body (13) adopts a hydraulic jack, one end of the hydraulic jack is connected with the first supporting pier (9) in a welding mode, and the other end of the hydraulic jack is connected with the upper pre-pressing beam (12) or the lower pre-pressing beam (14) which is connected with the transverse pressurizing body in a welding mode.

3. The large-span wide body reserved post-cast-in-place box girder formwork structure of claim 1, characterized in that: the vertical support rod (26) comprises a nut and a screw rod, the fastening directions of the screw rods on the two sides of the nut are opposite, and the two ends of the screw rod are respectively connected with the template buttress (25) and the template pressing plate (28) in a welding manner; the rotary support rod (27) comprises a nut and a screw rod, the fastening directions of the screw rods on the two sides of the nut are opposite, one end of the screw rod is connected with the template pressing plate (28) in a welding mode, and the other end of the screw rod is connected with the template buttress (25) through a support rod rotary hinge (32); the assembly inner side die (16), the assembly inner bottom die (17) and the assembly inner top die (18) are all prefabricated concrete templates and are connected with the box girder reinforcement cage (1) through template positioning ribs (33); a bag connecting pipe (34) is arranged on the bottom plate of the assembled inner side mold (16) and is communicated with the pulp storage bag (31) through the bag connecting pipe (34); the grout storage bag (31) is formed by sewing rubber sheets, and the elevation of the bottom surface is 10-30 mm higher than that of the top surface of the second filling pipe (30); the box girder outer mold (24) adopts an alloy template, a first filling pipe (29) and a second filling pipe (30) are respectively arranged on the side plates, and the first filling pipe (29) and the second filling pipe (30) are respectively communicated with external concrete filling equipment.