WO2021212921A1

WO2021212921A1 - Construction system for widened section of half-through arch bridge

Info

Publication number: WO2021212921A1
Application number: PCT/CN2020/142077
Authority: WO
Inventors: 周文; 朱志钢; 柯松林; 廖云沼; 杨景新; 张立军; 王学栋; 张应红
Original assignee: 中铁广州工程局集团有限公司; 中铁广州局集团桥梁工程有限公司
Priority date: 2020-04-21
Filing date: 2020-12-31
Publication date: 2021-10-28
Also published as: GB2599295B; GB202117698D0; GB2599295A

Abstract

A construction system for a widened section of a half-through arch bridge, comprising: a cast-in-place hanger (10) comprising a longitudinal support frame and a plurality of lower truss beams (12) fixed onto the bottom surface of the longitudinal support frame, both ends of each lower truss beam (12) extending out of both sides of the longitudinal support frame; and a spreader system comprising a plurality of boom devices respectively connected to the lower truss beams (12). The upper ends of the boom devices are all mounted on an arch rib (60) of the arch bridge, and the lower ends of the boom devices are respectively connected to both ends of the corresponding lower truss beams (12). According to the construction system, the cast-in-place hanger is fixedly connected to the arch rib by means of the spreader system, so that the construction of the widened section is implemented on the cast-in-place hanger, and after the construction is completed, the cast-in-place hanger and the spreader system are removed. The construction system reduces the construction risk in the construction process of the widened section, simplifies the operation procedure, shortens the construction period, and maximizes the economy, safety and practicability.

Description

A construction system for the variable-width section of a half-through arch bridge

Technical field

The invention relates to a construction system for a variable-width section of a mid-through arch bridge in the technical field of bridge construction.

Background technique

In recent years, large-scale transportation network is being built in various parts of our country, and bridges, as a common structural form that spans rivers, lakes and seas, are often used in every transportation network. Steel pipe arch bridges have greater spanning capacity, good durability and Bridges with low maintenance and repair costs are being used more and more frequently in various road networks. When the arch bridge adopts a half-through concrete-filled steel tube arch, the main girder at the junction of the beam and the arch is generally designed with a variable width section. The construction usually has the following two methods:

1. Hanging basket method, customizing a special hanging basket according to the variable width section beam structure, using the hanging basket to pour the variable width section concrete in sections, until the variable width section concrete beam is completely poured. However, when the hanging basket method is adopted, the hanging basket needs to be designed separately according to the width of each segment beam that constitutes the widening section. After the single-segment beam is poured, the hanging basket needs to be reformed. The material waste of the hanging basket is huge, and each time the hanging basket The process of restructuring and adjustment is cumbersome, time-consuming, and has great safety risks, which is not conducive to the smooth progress of on-site construction.

2. Bracket method: erect a steel tube bracket from below the beam of the variable width section, lay the bottom form, side form, etc. on it, bind the steel bars after pre-compression according to the design, and use the bracket to pour the concrete of the variable width section at one time. However, when using the bracket method, a certain foundation is required under the variable-width section beam to meet the requirements for erection of brackets and the requirements are not high. For bridges across rivers and rivers, the beam body needs to be erected in the water, which is difficult to construct.

Summary of the invention

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a construction system for the widening section of a mid-through arch bridge, which overcomes the inability to construct by conventional construction methods, the cumbersome construction process, and the large waste of materials. The problem.

According to an embodiment of the first aspect of the present invention, there is provided a construction system for a variable-width section of a mid-bearing arch bridge, which includes a cast-in-place hanger, the cast-in-place hanger includes a longitudinal support frame and a plurality of fixed on the bottom surface of the longitudinal support frame A lower truss beam, both ends of each of the lower truss beams protrude from both sides of the longitudinal support; a spreader system, the spreader system includes a plurality of boom devices connected to each lower truss beam, the boom The upper ends of the devices are all installed on the arch ribs of the arch bridge, and the lower ends of the suspension rod devices are respectively connected with the two ends of the corresponding lower truss beams.

According to the embodiment of the first aspect of the present invention, further, a first jack is connected between the upper end of the boom device and the arch rib.

According to the embodiment of the first aspect of the present invention, further, the longitudinal support frame includes a plurality of hanger longitudinal beams spaced in parallel, and the longitudinal direction of the hanger longitudinal beam is parallel along the direction of the cross section of the variable width section, and each of the lower The truss beams are distributed in parallel and spaced apart, and the lower truss beams are perpendicular to the hanger longitudinal beams.

According to the embodiment of the first aspect of the present invention, further, the boom device includes two first temporary booms, each of the first temporary booms is installed on the lower chord on both sides of the arch rib through a boom support, respectively, The boom support includes a hanger and a fixing piece, the bottom of the hanger is provided with a groove, the hanger is hung on the crossbar of the lower string through the groove, and both ends of the fixing piece are detachably connected to the groove On both sides, the fixing member is provided with a suspension rod through hole, the upper end of the first temporary suspension rod penetrates the suspension rod through hole and is fixed by an upper nut, and the lower end of the first temporary suspension rod passes through the lower truss beam The top surface is fixed by the lower nut.

According to the embodiment of the first aspect of the present invention, further, the boom device includes two transfer booms, and the transfer boom includes a second temporary boom and a permanent boom fixed on one side of the arch rib, The upper ends of each of the second temporary suspension rods are respectively connected with the permanent suspension rods through a transfer joint, and the lower ends of the second temporary suspension rods pass through the top surface of the lower truss beam and are fixed by lower nuts.

According to the embodiment of the first aspect of the present invention, further, the adapter includes an upper connecting piece fixed to the permanent boom, a lower connecting piece fixed to the second temporary boom, and two connecting bolts, the upper connecting piece Both ends of the lower connecting piece and the lower connecting piece are provided with connecting piece through holes, and the two ends of each connecting bolt respectively penetrate through the connecting through holes of the upper connecting piece and the lower connecting piece on the same side and are fixed by connecting nuts.

According to the embodiment of the first aspect of the present invention, further, the top surface of the end of the hanger longitudinal beam close to the cast section is connected to the bottom surface of the cast section, and the bottom surface of the end of the hanger longitudinal beam close to the cast section is provided with The end lower truss beam is fixed on the bottom surface of the casted section through an end boom device.

According to the embodiment of the first aspect of the present invention, further, the end boom device includes a pair of pull suspension rods and a sleeve sleeved on the outside of the pair of pull suspension rods, and the pair of pull suspension rods sequentially penetrate the cast section and the longitudinal direction. The supporting frame and the end lower truss beam, the two ends of the pair of pull suspension rods are fixed by the pair of pull nuts.

According to the embodiment of the first aspect of the present invention, further, at least one second jack is provided between the split nut on the top surface of the cast section and the cast section.

According to the embodiment of the first aspect of the present invention, further, a template system is provided on the longitudinal support frame, and the template system includes a bottom mold and two opposite side molds. The side molds are all located on the bottom mold. A molding space is formed between the side molds.

The beneficial effect of the present invention is that the present invention fixes the cast-in-place hanger and the arch rib through the spreader system, so that the widened section construction is carried out on the cast-in-place hanger, and the cast-in-place hanger and the hanger are removed after the construction is completed The system is fine. The invention reduces the construction risk in the construction process of the widening section, simplifies the operation process and shortens the construction period, and realizes the maximization of economy, safety and practicability.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in the description of the embodiments. Obviously, the drawings described are only a part of the embodiments of the present invention, rather than all the embodiments, and those skilled in the art can also obtain other design schemes and drawings based on these drawings without creative work.

Figure 1 is a schematic elevation view of the present invention;

Figure 2 is a schematic diagram of the A-A section in Figure 1;

Figure 3 is a top view of the present invention;

Figure 4 is a schematic diagram of the transfer boom in the present invention;

Figure 5 is a schematic diagram of the connection between the casted section and the lower end truss beam in the present invention;

Fig. 6 is a schematic diagram of the connection between the lower truss beam and the first temporary suspension rod in the present invention.

Detailed ways

This section will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description of the text part of the manual with graphics, so that people can understand the present invention intuitively and vividly. Each technical feature and overall technical solution of the invention cannot be understood as a limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation description involved, such as up, down, front, back, left, right, etc. indicates the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, but In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be configured and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In the description of the present invention, several means one or more, multiple means two or more, greater than, less than, exceeding, etc. are understood to not include the number, and above, below, and within are understood to include the number. If it is described that the first and second are only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly specifying the number of the indicated technical features or implicitly specifying the order of the indicated technical features relation.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

1 to 6, the construction system for the widening section of the mid-through arch bridge in the embodiment of the present invention includes a cast-in-place hanger 10 and a spreader system.

The cast-in-place hanger 10 includes a longitudinal support frame and a plurality of lower truss beams 12 fixed on the bottom surface of the longitudinal support frame, and both ends of each lower truss beam 12 extend out of both sides of the longitudinal support frame. Preferably, the longitudinal bearing frame includes a plurality of hanger longitudinal beams 11 spaced in parallel. The longitudinal beam 11 is vertical.

The spreader system includes a plurality of boom devices respectively connected to the lower truss beams 12, the upper ends of the boom devices are all installed on the arch ribs 60 of the arch bridge, and the lower ends of the boom devices are respectively connected to the two ends of the corresponding lower truss beams 12 connect. Preferably, a first jack is connected between the upper end of the boom device and the arch rib 60 to adjust the height of the cast-in-place hanger 10 to match the cast section.

According to the position and size of the cast-in-place hanger 10, different hanger devices can be used to connect the cast-in-place hanger 10 and the arch rib 60. Optionally, the boom device includes two first temporary booms 23, each of the first temporary booms 23 is respectively installed on the cross bar between the two lower chord steel pipes of the arch ribs 60 on both sides through a boom support. The support includes a hanging piece 21 and a fixing piece 22. The bottom of the hanging piece 21 is provided with a groove. The hanging piece 21 is hung on the crossbar of the lower chord through the groove. The two ends of the fixing piece 22 are detachably connected to both sides of the groove. The fixing piece A suspension rod through hole is provided on 22. The upper end of the first temporary suspension rod 23 penetrates through the suspension rod through hole and is fixed by an upper nut. The lower end of the first temporary suspension rod 23 passes through the top surface of the lower truss beam 12 and is fixed by a lower nut. .

As another alternative embodiment of the boom device, the boom device includes two transfer booms, the transfer boom includes a second temporary boom 33 and a permanent boom 31 fixed on one side of the arch rib 60, The upper ends of the second temporary suspension rods 33 are respectively connected to the permanent suspension rods 31 through the adapters 32, and the lower ends of the second temporary suspension rods 33 pass through the top surface of the lower truss beam 12 and are fixed by lower nuts. The adapter 32 includes an upper connecting member 321 fixed to the permanent boom 31, a lower connecting member 322 fixed to the second temporary boom 33, and two connecting bolts 323. The upper connecting piece 321 and the lower connecting piece 322 are both circular. Both ends of the upper connecting piece 321 and the lower connecting piece 322 are provided with connecting piece through holes. The two ends of each connecting bolt 323 respectively penetrate the upper connecting piece 321 and the lower connecting piece. The piece 322 is located at the connecting through hole on the same side and fixed by a connecting nut.

Further as a preferred embodiment, the top surface of the hanger stringer 11 near the end of the casted section 40 is connected to the bottom surface of the casted section 40 by lifting equipment, so as to ensure a more stable connection between the widened section and the casted section. smooth. An end lower truss beam 13 is provided on the bottom surface of one end of the hanger longitudinal beam 11 close to the cast section 40, and the end lower truss beam 13 is fixed on the bottom surface of the cast section 40 through an end hanger device. The end boom device includes a pair of pull boom 41 and a sleeve sleeved on the outside of the pair of pull boom 41. The pair of pull boom 41 sequentially penetrates the cast section 40, the longitudinal support and the end lower truss beam 13, and the pair is lifted. Both ends of the rod 41 are fixed by tension nuts. Preferably, at least one second jack 42 is provided between the tension nut on the top surface of the cast section 40 and the cast section 40 to adjust the elevation of the lower end truss beam 13.

A template system is provided on the longitudinal support frame. The template system includes a bottom mold 51 and two opposite side molds 52. The side molds 52 are located on the bottom mold 51. A forming space is formed between the two side molds 52. Concrete is poured to form a widened section.

The construction method of the present invention will be described below with examples.

In this embodiment, before the construction of the variable-width section, pre-construction is performed on the cast section that is connected to the variable-width section, that is, a pair of pull-through holes should be preset in the cast section 40. Specifically, referring to Fig. 1 and Fig. 5, setting the opposite pull through hole in the cast section 40 includes the following steps:

S1. The segment beams used to form the casted section have been preset with multiple vertical through holes when they are manufactured in the factory. The vertical through holes penetrate the casted section 40-segment beam vertically, and install the section beams to the designated position ；

S2. Insert a plurality of sleeves into each vertical through hole to fix, and the sleeve and the vertical through hole are interference fit;

S3. Bind the steel bars on the section beams of the poured section 40, and pour concrete into them, forming opposite pull through holes in the casing.

After the concrete in the segment beam of the poured section 40 reaches the design strength, a plurality of paired pull through holes are formed in the poured section 40, and then the widened section can be constructed.

The construction of the variable width section includes the following steps:

S10. Lift the prefabricated cast-in-situ hanger 10 by lifting equipment, so that the top surface of the cast-in-situ hanger 10 is flush with the bottom surface of the cast section 40.

Preferably, referring to Figure 3, the cast-in-situ hanger 10 includes a longitudinal bearing frame and a plurality of lower truss beams 12 fixed on the bottom surface of the longitudinal bearing frame. The frame includes a plurality of hanger longitudinal beams 11 arranged in parallel and spaced apart. In this embodiment, the hanger longitudinal beam 1 is a beret beam, which is mainly composed of a beret standard piece and a 900 standard flower window (or a 450 standard flower window). The Bailey beams of different specifications are arranged in a staggered manner, and the bottom surface of each Bailey beam is equipped with steel bars and welded to the top surface of the lower truss beam 12 to improve the overall stability of the longitudinal bearing.

The cable crane or hoist used for the installation of the steel pipe arch rib is connected with the hanger longitudinal beam 11 to hoist the cast-in-situ hanger 10 as a whole, so that the top surface of the cast-in-situ hanger 10 and the bottom surface of the cast section 40 abut. At this time, a plurality of pairs of pull suspension rods 40 are used to sequentially penetrate through the pairs of pull through holes of the cast section 40, the gap between adjacent hanger longitudinal beams 11, and the end lower truss beam 13, and then the pair is fixed by a pair of tension nuts. Pull the boom 40.

Further as a preferred embodiment, before installing the pair of pair nuts on the upper ends of the tie rods 40, install at least one second jack on the top surface of the cast section 40, and then install the pair of tie nuts so that the pair of tie nuts The bottom surface abuts against the top of the second jack. The height adjustment of the cast-in-place hanger can be realized by adjusting the second jack.

S20. Use a spreader system to connect both sides of the cast-in-place hanger 10 to both sides of the arch rib 60. The spreader system includes a plurality of hanger devices respectively connected to the lower truss beams 12, and the lower truss beams 12 can be used Different boom devices are connected to the arch rib 60. In this embodiment, there are a total of three lower truss beams 12, of which the two lower truss beams 12 close to the cast section 40 use a different suspension rod device from the remaining one of the lower truss beams 12.

A. Two lower truss beams 12 close to the cast section are provided with two suspension rod devices, each suspension rod device includes two first temporary suspension rods 23, optionally, the first temporary suspension rod 23 is prestressed steel Stranded wire. 6, using the first temporary boom 23 to connect the cast-in-place hanger 10 and the arch rib 60 includes the following steps:

S21A. Hang the pendant 21 on the cross bar between the two lower chord steel pipes of one side arch rib 60, and the groove at the bottom of the pendant 21 matches the cross bar, that is, the groove of the pendant 21 matches the curve of the original steel pipe of the cross bar.

S22A. Connect the fixing member 22 fixed to the first temporary boom 23 to the pendant 21, the fixing member 22 is connected to the top end of the first temporary boom 23, and the fixing member 22 closes the groove at the bottom of the pendant 21. Preferably, a bolt connection is adopted between the pendant 21 and the fixing member 22 to facilitate detachment and connection.

S23A. After the lower end of the first temporary boom 23 passes through the top surface of the lower truss beam 12, the lower end of the first temporary boom 23 is fixed on the lower truss beam 12 by a lower nut.

S24A. Repeat steps S21A to S23A to complete the connection between the lower truss beam 12 and the other side of the arch rib 60.

B. For the remaining lower truss beam 12, the boom device includes two adapter booms. The adapter boom includes an adapter 32 connected to the permanent boom 31 and a second temporary boom 33. The adapter 32 includes The upper connecting piece 321, the lower connecting piece 322, and at least two connecting bolts 323 having a circular shape, preferably, the number of connecting bolts 323 is six. 2 and 4, using the permanent boom 31, the adapter 32 and the second temporary boom 33 to connect the cast-in-place hanger 10 and the arch rib 60 includes the following steps:

S21B. The upper connecting piece 321 is fixed to the anchor at the lower end of the permanent boom 31 on the side of the arch rib 60 by means of an internal threaded thread. The lower part of the anchor is provided with an external threaded thread, and the lower connecting piece 322 is fixed to The upper end of the second temporary boom 33.

S22B. After both ends of each connecting bolt 323 penetrate through the connecting through holes on the same side of the upper connecting piece 321 and the lower connecting piece 322, they are fixed by connecting nuts. Since the upper connecting piece 321 and the lower connecting piece 322 are connected by the connecting bolt 323, the distance between the upper connecting piece 321 and the lower connecting piece 322 can be adjusted to adjust the overall length of the transfer boom to adapt to the lower truss beam 12 and The distance of the arch rib 60.

S23B. After the lower end of the second temporary suspension rod 33 passes through the top surface of the lower truss beam 12, the lower end of the second temporary suspension rod 33 is fixed on the lower truss beam 12 by a lower nut.

S24B. Repeat steps S21B to S23B to complete the connection between the lower truss beam 12 and the other side of the arch rib 60.

Since the second temporary boom 33 is combined with the permanent boom 31 to form a permanent-immediate boom, the force is clear, the boom device is easy to install and dismantle, and the amount of steel used is small.

As a further preferred embodiment, a first jack is provided between the boom device of the spreader system and the arch rib 60, and the height of the cast-in-situ hanger can be adjusted by adjusting the first jack.

After the spreader system has completed the connection of the cast-in-place hanger 10 and the arch rib 60, that is, after steps A and B are completed, step S25 is further included. Step S25 includes removing the connection between the lifting equipment and the cast-in-place hanger 10 to facilitate Then install the formwork system and pour. After the lifting equipment is removed, the cast-in-place hanger 10 is preloaded.

S30. Lay a formwork system for pouring the widened section on the top surface of the cast-in-place hanger 10, and pour concrete to form the widened section after tying the steel bars. The formwork system includes a bottom mold 51 and two side molds 52. In step S30, the bottom mold 51 is first laid on the top surface of the longitudinal support frame, and then two opposite side molds 52 are installed on the bottom mold 51, and then the two side molds 52 are installed on the bottom mold 51. The steel bars are tied between the two side molds 52 and the widened section is poured.

S40. After the concrete reaches the design strength and the longitudinal prestressed tendons of the box girder are stretched, the spreader system is removed, and the cast-in-situ hanger 10 is lifted by lifting equipment. Specifically, after the widened section of concrete reaches the design strength and the box girder longitudinal prestressed tendons are stretched, the cable crane or hoist used for the installation of the steel pipe arch rib is reconnected to the cast-in-place hanger 10, and then the first temporary hanger is removed The rod 23 and its boom support, the second temporary boom 33 and its adapter, a cable crane or a hoist hoist the cast-in-place hanger away.

The above is a detailed description of the preferred embodiments of the present invention, but the invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. These equivalent modifications or replacements are all included in the scope defined by the claims of this application.

Claims

A construction system for the variable width section of a half-through arch bridge, which is characterized in that it comprises:

The cast-in-place hanger (10) includes a longitudinal bearing frame and a plurality of lower truss beams (12) fixed on the bottom surface of the longitudinal bearing frame, and both ends of each of the lower truss beams (12) Extend both sides of the longitudinal support frame;

A spreader system, the spreader system includes a plurality of boom devices respectively connected to the lower truss beams (12), the upper ends of the boom devices are all installed on the arch ribs (60) of the arch bridge, and the boom The lower end of the device is respectively connected with the two ends of the corresponding lower truss beam (12).
The construction system for the variable width section of a mid-supported arch bridge according to claim 1, wherein a first jack is connected between the upper end of the boom device and the arch rib (60).
The construction system for the variable-width section of a mid-supported arch bridge according to claim 1, characterized in that: the longitudinal bearing frame comprises a plurality of hanger longitudinal beams (11) spaced in parallel, and the longitudinal beams (11) of the hanger The length direction is parallel along the direction of the cross section of the variable width section, the lower truss beams (12) are distributed in parallel and spaced apart, and the lower truss beams (12) are perpendicular to the hanger longitudinal beams (11).
The construction system for the variable-width section of a mid-supported arch bridge according to claim 3, characterized in that: the boom device includes two first temporary booms (23), each of the first temporary booms (23) respectively The suspension rod support is installed on the lower chord on both sides of the arch rib (60). The suspension rod support includes a hanging piece (21) and a fixing piece (22). The bottom of the hanging piece (21) is provided with a groove, so The hanging piece (21) is hung on the cross bar between the two lower chord steel pipes of one side arch rib (60) through a groove, and both ends of the fixing piece (22) are detachably connected to both sides of the groove. The fixing member (22) is provided with a suspension rod through hole, the upper end of the first temporary suspension rod (23) passes through the suspension rod through hole and then is fixed by an upper nut, and the lower end of the first temporary suspension rod (23) passes through The top surface of the lower truss beam (12) is fixed by lower nuts.
The construction system for the variable-width section of a mid-supported arch bridge according to claim 3, characterized in that: the boom device includes two transfer booms, and the transfer boom includes a second temporary boom (33) and The permanent boom (31) fixed on one side of the arch rib (60), the upper end of each second temporary boom (33) is respectively connected with the permanent boom (31) through the adapter (32), the first The lower ends of the two temporary suspension rods (33) pass through the top surface of the lower truss beam (12) and are fixed by lower nuts.
The construction system for the widening section of a mid-supported arch bridge according to claim 5, characterized in that: the adapter (32) includes an upper connecting piece (321) fixed to a permanent boom (31), and a second temporary suspension The lower connecting piece (322) fixed to the rod (33) and two connecting bolts (323), both ends of the upper connecting piece (321) and the lower connecting piece (322) are provided with connecting piece through holes, each The two ends of the connecting bolt (323) respectively penetrate through the connecting through holes of the upper connecting piece (321) and the lower connecting piece (322) on the same side, and then are fixed by the connecting nut.
The construction system for the variable-width section of a mid-through arch bridge according to claim 3, wherein the hanger longitudinal beam (11) is close to the top surface of one end of the cast section (40) and the bottom surface of the cast section (40). Connected, the hanger longitudinal beam (11) is provided with an end lower truss beam (13) on the bottom surface of one end close to the cast section (40), and the end lower truss beam (13) is fixed on the The bottom surface of the pouring section (40).
The construction system for the variable-width section of the mid-supported arch bridge according to claim 7, characterized in that: the end boom device includes a pair of pull boom (41) and a sleeve set on the outside of the pair of pull boom (41) Tube, the pair of pull suspension rods (41) sequentially penetrate the cast section (40), the longitudinal support frame and the end lower truss beam (13), and the two ends of the pair of pull suspension rods (41) are fixed by the pair of pull nuts.
The construction system for the variable-width section of a mid-supported arch bridge according to claim 8, characterized in that: at least one second thousandth The catty (42).
The construction system for the variable width section of the mid-supported arch bridge according to claim 3, characterized in that: the longitudinal bearing frame is provided with a formwork system, and the formwork system includes a bottom form (51) and two opposite side forms ( 52), the side molds (52) are all located on the bottom mold (51), and a molding space is formed between the two side molds (52).