CN116463944A - Main arch structure for steel tube concrete tie rod arch bridge and construction method thereof - Google Patents

Abstract

The application relates to a main arch structure for a steel tube concrete tie rod arch bridge and a construction method thereof, and relates to the technical field of bridge structures, wherein the main arch structure comprises two arch seats, a plurality of sections of arch bodies arranged between the two arch seats and a reinforcing structure arranged at the joint of the adjacent arch bodies; the arch bodies are sequentially connected into an arch shape, the arch bodies at two ends are connected to the two arch seats, and the reinforcing structure comprises two groups of mounting assemblies and reinforcing rods, wherein the two groups of mounting assemblies are respectively connected to the two adjacent arch bodies, and the reinforcing rods are fixedly connected with the two groups of mounting assemblies. The reinforcing structure is added at the connecting part of the adjacent arch bodies, the connecting part of the adjacent arch bodies is reinforced by the reinforcing structure on the basis of the connection of the adjacent arch bodies, so that the connection between the arch bodies is firmer and tighter, the stability and the firmness of the whole main arch structure are higher, and the deformation resistance is stronger.

Description

Main arch structure for steel tube concrete tie rod arch bridge and construction method thereof

Technical Field

The application relates to the technical field of bridge structures, in particular to a main arch structure for a steel tube concrete tie rod arch bridge and a construction method thereof.

Background

The tied-arch bridge, which is a member of the family of arch bridges, has the general characteristics of an arch bridge and has unique characteristics of itself. The bridge combines the two basic structural forms of arch and beam together to bear load, and the structural performance and combination effect of the bent and pressed arch are fully exerted. The arch and the string are connected by vertical rods with hinged ends, and inclined rods can be used for replacing straight rods to form a Nielsen system. The arch bridge is internally provided with a hyperstatic system, and the outside of the arch bridge is statically determined, so that the arch bridge has no influence on uneven settlement of the abutment.

The steel tube concrete arch bridge is taken as an excellent steel-concrete combined structure bridge, rapid development is achieved in recent years, the main arch web members of the steel tube concrete truss arch bridge are mainly arranged in an N shape, the included angle between the inclined web members and the axis of the main arch is generally 30-60 degrees, the free length of the web members in the arrangement form is larger than or equal to the section height of the main arch, and the free length of the web members is generally 1.15-2 times of the section height of the main arch.

Along with the continuous increase of the span of the steel pipe concrete arch bridge, the main arch structure of the tied arch bridge is unstable, the installation difficulty is increased, more problems are brought to the construction of the tied arch bridge, and the construction period is prolonged.

Disclosure of Invention

The main arch structure for the steel tube concrete tie rod arch bridge and the construction method thereof are stable in installation structure, difficult to install and safer and more reliable in construction.

In a first aspect, the present application provides a main arch structure for a steel pipe concrete tie rod arch bridge, which adopts the following technical scheme:

a main arch structure for a steel tube concrete tie rod arch bridge comprises two arch seats, a plurality of sections of arch bodies arranged between the two arch seats and a reinforcing structure arranged at the joint of the adjacent arch bodies;

the arch bodies are sequentially connected into an arch shape, the arch bodies at two ends are connected to the two arch seats, and the reinforcing structure comprises two groups of mounting assemblies and reinforcing rods, wherein the two groups of mounting assemblies are respectively connected to the two adjacent arch bodies, and the reinforcing rods are fixedly connected with the two groups of mounting assemblies.

Through adopting above-mentioned technical scheme, increase additional strengthening in adjacent hunch body junction, on the basis that adjacent hunch body is connected, utilize additional strengthening to consolidate the junction of adjacent hunch body, make the connection between the hunch body firm inseparabler, stability and fastness are higher of whole main arch structure, and anti deformability is stronger.

Optionally, the arch body includes two sets of parallel and the single bent that sets up relatively, and single bent includes string pipe, lower string pipe and connects the web member between string pipe and the lower string pipe, all is connected with the rib pole between string pipe and the lower string pipe on two sets of single bent, connects through string pipe and lower string pipe between the adjacent arch body.

Through adopting above-mentioned technical scheme, the structure that makes the hunch body is more stable, and structural strength is high, is difficult for taking place deformation, has promoted the intensity of main arch structure simultaneously.

Optionally, the installation component includes the cover and locates the last sleeve pipe on the last string pipe, the cover is located the lower sleeve pipe on the lower string pipe and is connected the connecting plate between last sleeve pipe and the lower sleeve pipe, and the stiffener is connected between two connecting plates.

Through adopting above-mentioned technical scheme, installation component can be with the arch upper and lower string pipe connection, has strengthened the stability between the arch upper and lower string pipe tip, avoids upper and lower string pipe tip to take place to warp, utilizes the stiffener to link together two installation components, has further promoted the structural strength of arch junction.

Optionally, the stiffener is connected with connecting plate bolt, and the stiffener both ends are provided with a plurality of connecting holes along length direction, and connecting bolt is adjustable to pass different connecting holes.

Through adopting above-mentioned technical scheme, the reinforcing rod is adjustable with the hookup location of connecting plate, can make upper sleeve pipe and lower sheathed tube mounted position adjustable, can avoid the position of web member, more convenient installation of installation component.

Optionally, a compartment plate is arranged at the end part of the upper chord pipe of the arch body with the largest height, the compartment plate divides the inner part of the upper chord pipe with the gradually reduced heights at two sides into a grouting cabin, a grouting pipe is arranged on the upper chord pipe at the bottom of the grouting cabin, and a grouting pipe is arranged on the upper chord pipe at the top of the grouting cabin;

the structure arranged on the lower chord tube is the same as the structure arranged on the upper chord tube.

By adopting the technical scheme, the grouting bin is formed in the upper chord pipe and the lower chord pipe, the grouting pipe at the lower end is used for injecting mortar concrete into the grouting bin until the mortar concrete emerges from the grouting pipe, and the arch body adopts a steel pipe concrete structure to strengthen the strength of the structure.

Optionally, exhaust holes are formed in the upper chord pipe and the lower chord pipe of the slurry outlet pipe, and the height of the exhaust holes is lower than that of the slurry outlet pipe.

By adopting the technical scheme, the air in the pressure injection mortar concrete is discharged by the exhaust holes, so that the pressure injection quality of the mortar concrete is improved.

In a second aspect, the construction method for the main arch structure of the steel pipe concrete tie rod arch bridge provided by the application adopts the following technical scheme:

a construction method for a main arch structure of a steel tube concrete tie rod arch bridge comprises the following steps:

fixing the arch base at the top of the bridge pier;

the top of other arch seats except the arch seats at the two ends is provided with a diagonal buckling tower;

mounting a floor stand at a corresponding position below the arch body of the arch base close to the two ends, wherein the height of the floor stand gradually rises along with the rising of the height of the arch body;

constructing a plurality of main arch structures according to the sequence of construction from two ends to the middle, and constructing a single main arch structure according to the sequence of construction from two ends to the middle;

when the end main arch structure is constructed, two arch bodies with the lowest height are respectively fixed on the two arch seats, the two arch bodies with the second lowest height are connected with the arch body with the lowest height by moving to a floor support, and the other arch body is hung on a diagonal buckling tower through a buckling rope to be connected with the arch body with the lowest height, so that the increment of the arch body height and the installation are completed in the same manner until the main arch structure is capped;

when the non-end main arch structure is constructed, the two arch bodies with the lowest height are respectively fixed on the two arch seats, the two arch bodies with the second lowest height are installed in a mode of being connected with the arch body with the lowest height by hanging the arch bodies on the diagonal buckling tower through buckling ropes, and the incremental installation of the arch body heights is completed in the same mode until the main arch structure is capped;

and dismantling the cable-stayed buckling tower and the landing bracket.

By adopting the technical scheme, the installation of the main arch structure adopts the construction mode that the floor support is matched with the inclined pulling buckling, so that the safety and stability of the main arch structure in the installation process can be improved, and particularly, the efficiency is obviously improved in the installation process of a plurality of whole main arches.

Optionally, the main arch structure is installed by adopting a bridge deck gantry crane, the arch body is not lifted, and the arch body is transported to the position to be installed from the ground or trestle, and then is lifted to the installation position by adopting a mode of passing through the main beam structure space.

Through adopting above-mentioned technical scheme, adopt portal crane to come the handling arch body, the handling process is safer, and the arch body is more stable, lifts by crane from ground or landing stage position, can conveniently and fast the handling to mounted position more, improves the installation effectiveness of whole main arch structure, also can avoid causing the damage to the roof beam body of bridge body.

Optionally, each arch body is provided with at least two tension points from the buckling ropes, and the heights of the connecting positions of the corresponding buckling ropes on the arch body and the inclined-pulling buckling towers gradually rise along with the rising of the installed arch body.

Through adopting above-mentioned technical scheme, make the distribution of knot rope more orderly, can not take place winding condition, improved the security of work progress, the atress condition of detaining the tower to one side is more reasonable, safer.

Optionally, before dismantling the cable-stayed buckling tower and the floor stand, the pressing injection of mortar concrete in the arch body is needed, and the pressing injection process comprises the following steps:

mixing mortar concrete;

arch body alignment measurement:

opening holes on the upper chord pipe and the lower chord pipe respectively, and installing a grouting pipe and a slurry outlet pipe;

cleaning dirt in the grouting bin and wetting the inner wall of the grouting bin;

grouting mortar concrete into the grouting bin, measuring arch shape, and grouting to the slurry outlet pipe;

closing the grouting pipe, and stabilizing the pressure in the grouting bin;

removing the grouting pipe and the grouting pipe to finish grouting;

repairing the positions of the holes on the upper chord tube and the lower chord tube.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the reinforcing structure is added at the connecting part of the adjacent arch bodies, the connecting part of the adjacent arch bodies is reinforced by the reinforcing structure on the basis of the connection of the adjacent arch bodies, so that the connection between the arch bodies is firmer and tighter, the stability and the firmness of the whole main arch structure are higher, and the deformation resistance is stronger.

2. The installation component can be with the last string pipe of hunch body link together, has strengthened the stability between the last string pipe tip of hunch body, avoids going up string pipe tip and takes place to warp about, utilizes the stiffener to link together two installation components, has further promoted the structural strength of hunch body junction.

3. The installation of main arch structure adopts the construction mode that the floor support cooperates with the diagonal draw knot to hang in this application, can improve safety and stability in the main arch structure installation, especially the installation of a plurality of whole main arches, and efficiency obtains showing promotion.

Drawings

FIG. 1 is a schematic view of a single main arch structure in embodiment 1 of the present application;

FIG. 2 is a schematic view showing the connection state of the arch body and the reinforcement structure in embodiment 1 of the present application;

FIG. 3 is a schematic view showing the construction of a grouting chamber in embodiment 1 of the present application;

FIG. 4 is a schematic view of the installation process of the multiple primary arches in embodiment 2 of the present application;

fig. 5 is a schematic diagram of a second installation process of the multiple main arch structures in embodiment 2 of the present application:

in the figure, 1, a arch base; 2. arch body; 21. a winding pipe; 22. a lower chord tube; 23. a web member; 24. a rib bar; 25. grouting pipe; 26. a slurry outlet pipe; 3. a reinforcing structure; 31. a reinforcing rod; 32. a sleeve is arranged; 33. running a sleeve; 34. a connecting plate; 4. a cable-stayed buckling tower; 5. a floor stand; 6. a buckling rope; and 7, a gantry crane.

Detailed Description

The present application is described in further detail below with reference to fig. 1-5.

Example 1: referring to fig. 1 and 2, a main arch structure for a steel pipe concrete tie rod arch bridge is taken as an example in this embodiment, and includes two arch abutments 1, a plurality of sections of arch bodies 2 and a plurality of groups of reinforcing structures 3. The arch support 1 is of a trapezoid concrete structure, the bottom of the arch support is fixed at the top of a pier, and the arch body 2 is fixed on an inclined slope of the arch support 1; the arch bodies 2 are connected end to form an arch, the arch bodies 2 at two ends are connected to the two arch seats 1, end faces between the arch bodies 2 are welded or connected through connecting flanges, the reinforcing structures 3 are connected to the connecting positions of the adjacent arch bodies 2 to reinforce the connecting positions of the arch bodies 2, and in the embodiment, the reinforcing structures 3 are arranged on two sides of the arch bodies 2.

The arch body 2 comprises two groups of parallel single-row frames which are oppositely arranged, each single-row frame comprises an upper chord tube 21, a lower chord tube 22 and web members 23, the upper chord tubes 21 and the lower chord tubes 22 are arc hollow round tubes, the web members 23 are provided with a plurality of pieces, the single-row frames are connected between the upper chord tubes 21 and the lower chord tubes 22 and distributed in an N shape, the two groups of single-row frames are connected through rib rods 24, the rib rods 24 are connected between the upper chord tubes 21 of the two groups of single-row frames and between the lower chord tubes 22 of the two groups of single-row frames, and when the adjacent arch bodies 2 are connected, the adjacent arch bodies are connected through the upper chord tubes and the lower chord tubes.

The reinforcing structure 3 is arranged on the outer sides of the two groups of single-row racks, one group is arranged on each side, each group of reinforcing structure 3 comprises two groups of mounting assemblies and a reinforcing rod 31, the two groups of mounting assemblies are respectively connected to the adjacent two arch bodies 2, and the reinforcing rods 31 are fixedly connected between the two groups of mounting assemblies. The installation component includes upper sleeve 32, lower sleeve 33 and connecting plate 34, and upper sleeve 32 cover is established at last string pipe 21 tip, and lower sleeve 33 cover is established at lower string pipe 22 tip, and connecting plate 34 both ends are connected on the upper sleeve 32 outer wall and on the lower sleeve 33 outer wall, and upper sleeve 32, lower sleeve 33 and connecting plate 34 link into an integral whole and install, and stiffener 31 is connected between two connecting plates 34. In this embodiment, the reinforcing rod 31 is detachably connected with the connecting plate 34, the connecting plate 34 is provided with connecting holes, two ends of the reinforcing rod 31 are also provided with a plurality of connecting holes along the length direction, bolts respectively penetrate through the connecting holes on the connecting plate 34 and the reinforcing rod 31 and are fixed, and the connecting bolts can penetrate through different connecting holes on the reinforcing rod 31, so that the installation positions of the upper sleeve 32 and the lower sleeve 33 can be adjusted, and the positions of the web members 23 can be avoided.

Referring to fig. 3, in this embodiment, the number of arch bodies 2 of a main arch structure is singular, the height of the arch body 2 in the middle is the largest, a partition plate is arranged at the end part of the upper chord tube 21 of the arch body 2 with the largest height, the partition plate divides the interior of a plurality of upper chord tubes 21 with gradually reduced heights at two sides into grouting chambers for grouting mortar concrete, holes are formed in the upper chord tube 21 at the bottom of each grouting chamber at each side and are connected with grouting tubes 25, holes are formed in the upper chord tube 21 at the top of each grouting chamber at each side and are connected with grouting tubes 26, the grouting tubes 25 and the grouting tubes 26 are connected in a detachable manner, and the mortar concrete can be injected into the grouting chambers from the grouting tubes 25 at the lower end until the mortar concrete is stopped when the grouting tubes 26 emerge. In this embodiment, the upper chord tube 21 provided with the grout outlet tube 26 is provided with an air vent, the set height of the air vent is lower than that of the grout outlet tube 26, and air in the pressure injection mortar concrete is discharged through the air vent, so that the pressure injection quality of the mortar concrete is improved.

In this embodiment, the grouting structure on the lower chord tube 22 is the same as the grouting structure on the upper chord tube 21, so that the grouting cabin formed by the lower chord tube 22 is convenient for injecting the mortar concrete.

Example 2: a construction method for a main arch structure of a steel pipe concrete tie rod arch bridge, which is applied to the construction of a plurality of continuous main arch structures, referring to fig. 4 and 5, comprises the following steps:

s1, constructing and forming an arch abutment 1 at the top of a pier;

s2, installing a diagonal buckling tower 4 on the top surfaces of other arch seats 1 except the arch seats 1 at two ends, wherein the diagonal buckling tower 4 is of an upright steel frame structure, arranging steel anchor beams on the diagonal buckling tower 4, tensioning and anchoring buckling ropes 6, tensioning by adopting a low-stress clamping piece anchorage device in a group anchoring mode, locking clamping pieces in a pressing plate mode, and enabling the safety coefficient of the buckling ropes 6 to be 3;

s3, mounting a floor support 5 at a corresponding position below the arch body 2 of the arch support 1 close to the two ends, wherein the height of the floor support 5 gradually increases along with the increase of the height of the arch body 2;

s4, constructing a plurality of main arch structures according to the construction sequence from two ends to the middle, and installing the arch body 2 according to the construction sequence from two ends to the middle by a single main arch structure;

s5, during construction of the end main arch structure, the two arch bodies 2 with the lowest height are respectively fixed on the two arch seats 1, the two arch bodies 2 with the second lowest height are moved to the floor support 5 to be connected with the arch body 2 with the lowest height, and the other arch body is hung on the cable-stayed buckling tower 4 through the buckling cable 6 to be connected with the arch body 2 with the lowest height, so that the arch body 2 is gradually increased in height and installed in the same manner until the main arch structure is capped;

s6, during construction of a non-end main arch structure, respectively fixing two arch bodies 2 with the lowest height on the two arch seats 1, installing the two arch bodies 2 with the second lowest height in a mode of being hung on a diagonal buckling tower 4 through buckling ropes 6 and being connected with the arch body 2 with the lowest height, and finishing incremental installation of the height of the arch bodies 2 in the same mode until the main arch structure is capped;

s7, after the installation of the main arch structure is completed, grouting mortar concrete in a grouting bin formed by the arch body 2;

s8, after the injection of the mortar concrete is completed, dismantling the cable-stayed buckling tower 4 and the floor stand 5.

The process of pressing the injected mortar concrete further comprises the following steps:

mixing mortar concrete and transporting to an installation site;

linear measurement is carried out on the arch body 2, and data of the main arch structure are known:

the corresponding upper chord pipe 21 and lower chord pipe 22 are respectively perforated by perforating equipment, a grouting pipe 25 and a grouting pipe 26 are correspondingly arranged, and exhaust holes are reserved at the same time;

injecting water into the grouting bin through the grouting pipe 25, cleaning dirt in the grouting bin, and wetting the inner wall of the grouting bin;

pouring mortar concrete into the grouting bin through the grouting pipe 25, and intermittently measuring the line shape of the arch body 2 to know the linear change of the arch body 2 until the grouting pipe 26 has slurry overflow;

closing the grouting pipe 25, stopping grouting, and waiting for pressure stabilization in the grouting bin;

after the pressure stabilization is finished, the grouting pipe 25 and the grouting pipe 26 are removed, and grouting work is finished;

repairing the positions of the openings on the upper chord tube 21 and the lower chord tube 22 can be sealed in a welding mode.

In this embodiment, the main arch structure is installed by using a bridge deck gantry crane 7, the 2 arch body is not lifted, and the arch body 2 is directly transported from the ground or trestle to the position to be installed and then is lifted to the installation position by adopting a mode of passing through the space between the main girder structures of the bridge. The landing leg of gantry crane 7 is for the self-elevating design, and the girder cantilever is upwards collapsible design, can conveniently and fast with hunch body 2 handling to mounted position, improves the installation effectiveness of whole main arch structure.

In order to keep stability after the arch body 2 is installed, at least two tension points from the buckling ropes 6 are arranged above each arch body 2, and along with the rising of the installed arch body 2, the height of the connecting position of the corresponding buckling ropes 6 on the arch body 2 and the inclined pulling buckling tower 4 is gradually increased, so that the distribution of the buckling ropes 2 is more orderly, the winding condition can not occur, the safety of the construction process is improved, and the stress condition of the inclined pulling buckling tower 4 is more reasonable and safer.

The embodiments of this embodiment are all preferred embodiments of the present application, and are not intended to limit the scope of the present application, in which like parts are denoted by like reference numerals. Therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. The main arch structure for the steel tube concrete tie rod arch bridge is characterized by comprising two arch seats (1), a plurality of sections of arch bodies (2) arranged between the two arch seats (1) and a reinforcing structure (3) arranged at the joint of the adjacent arch bodies (2);

the arch bodies (2) of the multiple sections are sequentially connected into an arch shape, the arch bodies (2) at two ends are connected to the two arch seats (1), and the reinforcing structure (3) comprises two groups of mounting assemblies respectively connected to the two adjacent arch bodies (2) and reinforcing rods (31) fixedly connected with the two groups of mounting assemblies.

2. A main arch structure for a concrete filled steel tube tie arch bridge according to claim 1, wherein the arch body (2) comprises two groups of parallel and oppositely arranged single-row frames, each single-row frame comprises an upper chord tube (21), a lower chord tube (22) and a web member (23) connected between the upper chord tube (21) and the lower chord tube (22), rib rods (24) are connected between the upper chord tubes (21) and between the lower chord tubes (22) of the two groups of single-row frames, and adjacent arch bodies (2) are connected through the upper chord tubes (21) and the lower chord tubes (22).

3. A main arch structure for a concrete filled steel tube tie arch bridge according to claim 2, wherein the mounting assembly comprises an upper sleeve (32) sleeved on the upper chord tube (21), a lower sleeve (33) sleeved on the lower chord tube (22), and a connecting plate (34) connected between the upper sleeve (32) and the lower sleeve (33), and the reinforcing rod (31) is connected between the two connecting plates (34).

4. A main arch structure for a concrete filled steel tube tie bar arch bridge according to claim 3, wherein the reinforcing bars (31) are bolted to the connecting plates (34), and a plurality of connecting holes are provided at both ends of the reinforcing bars (31) in the length direction, and the connecting bolts are adjustable through the different connecting holes.

5. The main arch structure for the steel pipe concrete tie rod arch bridge according to claim 2, wherein a compartment plate is arranged at the end part of an upper chord pipe (21) of the arch body (2) with the largest height, the compartment plate divides the inner part of the upper chord pipe with the gradually reduced heights at two sides into a grouting cabin, a grouting pipe (25) is arranged on the upper chord pipe (21) at the bottom of the grouting cabin, and a grouting pipe (26) is arranged on the upper chord pipe (21) at the top of the grouting cabin;

the structure arranged on the lower chord tube (22) is the same as the structure arranged on the upper chord tube (21).

6. The main arch structure for the steel tube concrete tie-bar arch bridge according to claim 5, wherein the upper chord tube (21) and the lower chord tube (22) provided with the grout outlet tube (26) are provided with vent holes, and the height of the vent holes is lower than the height of the grout outlet tube (26).

7. The construction method for the main arch structure of the steel tube concrete tie rod arch bridge is characterized by comprising the following steps of:

fixing an arch abutment (1) at the top of a bridge pier;

the top of other arch seats (1) except the arch seats (1) at the two ends is provided with a diagonal buckling tower (4);

a floor stand (5) is arranged at a position corresponding to the lower part of the arch body (2) of the arch base (1) close to the two ends, and the height of the floor stand (5) is gradually increased along with the increase of the height of the arch body (2);

constructing a plurality of main arch structures according to the sequence of construction from two ends to the middle, and constructing a single main arch structure according to the sequence of construction from two ends to the middle;

when the end part main arch structure is constructed, two arch bodies (2) with the lowest height are respectively fixed on two arch seats (1), the two arch bodies (2) with the second lowest height are moved to a ground support (5) to be connected with the arch body (2) with the lowest height, and the other arch body is hung on a diagonal buckling tower (4) through a buckling rope (6) to be connected with the arch body (2) with the lowest height, so that the arch bodies (2) are gradually increased in height and are installed in the same manner until the main arch structure is capped;

when the non-end main arch structure is constructed, the two arch bodies (2) with the lowest height are respectively fixed on the two arch seats (1), the two arch bodies (2) with the next lowest height are mounted in a mode of being hung on a diagonal buckling tower (4) through buckling ropes (6) and connected with the arch body (2) with the lowest height, and the arch bodies (2) are gradually increased in height and mounted in the same mode until the main arch structure is capped;

dismantling the cable-stayed buckling tower (4) and the floor stand (5).

8. The construction method for the main arch structure of the steel pipe concrete tie rod arch bridge according to claim 7, wherein the main arch structure is installed by adopting a bridge deck gantry crane (7) in a hoisting mode, the arch body (2) is not lifted, and the arch body (2) is hoisted to an installation position in a mode of penetrating through a main beam structural space after being transported to the installation position from the ground or a trestle.

9. The construction method for the main arch structure of the steel tube concrete tie rod arch bridge according to claim 7, wherein each arch body (2) is provided with at least two tension points from the buckling ropes (6), and the height of the connecting position of the corresponding buckling rope (6) on the arch body (2) and the inclined pulling buckling tower (4) gradually increases along with the increase of the height of the installed arch body (2).

10. The construction method for the main arch structure of the steel tube concrete tie rod arch bridge according to claim 7, wherein before the cable stayed buckling tower (4) and the floor stand (5) are removed, the grouting of mortar concrete in the arch body (2) is further needed, and the grouting process comprises the following steps:

mixing mortar concrete;

linear measurement of arch (2):

the upper chord pipe (21) and the lower chord pipe (22) are respectively provided with holes, and a grouting pipe (25) and a slurry outlet pipe (26) are arranged;

cleaning dirt in the grouting bin and wetting the inner wall of the grouting bin;

grouting mortar concrete into the grouting bin, measuring the shape of the arch body (2), and leading the arch body to be in slurry overflow of a slurry outlet pipe (26);

closing the grouting pipe (25) and stabilizing the pressure in the grouting bin;

removing the grouting pipe (25) and the grouting pipe (26) to finish grouting;

repairing the positions of the openings on the upper chord tube (21) and the lower chord tube (22).