Construction method of prefabricated beam of long-span concrete-filled steel tube arch bridge

Abstract

The present application relates to a kind of construction methods of large-span steel pipe concrete arch bridge prefabricated assembly beam, comprising the following steps: pedestal prefabrication, prefabricated assembly beam formwork support, prefabricated beam landing, end middle beam construction, prefabricated beam wet joint construction.The beneficial effects of the present application are: the upper part of prefabricated beam formwork uses replaceable side mold section, which can be adjusted within a certain height range, suitable for beam prefabrication construction of various beam heights, improving the utilization rate of materials;When prefabricating beam, the lifting rope sleeve used for beam transfer is pre-buried by setting base reserved square hole, the lifting rope passes through lifting rope sleeve to hoist prefabricated beam, which protects beam body during transfer and does not cause lifting rope sliding;Wet joint between tie beam and prefabricated beam uses integral lifting mold system, and the positioning-pouring integrated base mold is connected to wet joint side lifting mold through wet joint side lifting mold fixing bolt, which ensures the construction quality of wet joint.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of beam construction of large-span steel pipe concrete arch bridge, and particularly relates to a construction method of a prefabricated assembly type beam of a large-span steel pipe concrete arch bridge. BACKGROUND

[0002] As an important part of the traffic line, the bridge construction is very brilliant. With the continuous emergence of new materials and the improvement of people's knowledge of mechanics, various arch bridges have emerged in turn. From the initial stone arch bridge to the later iron arch bridge, steel arch bridge and concrete arch bridge, the span capacity of the arch bridge has been greatly improved, and the cross-sectional size has been reduced.

[0003] At present, the beam is generally constructed by factory prefabrication and on-site hoisting installation. The formwork used in the prefabrication yard has limited rigidity and cannot be used to manufacture a large-span beam. In addition, the formwork setting and stripping currently used consumes a large amount of labor, and the end of the formwork is prone to slurry leakage. At the same time, in the construction process of the steel pipe concrete arch bridge, the hoisting of the prefabricated beam is also one of the difficulties in construction. In engineering, a cable crane main hoist is often used to directly bind the beam body for hoisting or a floating crane is used for hoisting, but both methods are subject to certain conditions in engineering application.

[0004] Therefore, on the basis of summarizing the traditional construction method, the construction method of the prefabricated assembly type beam of the large-span steel pipe concrete arch bridge is innovated, and the prefabricated assembly type beam of the large-span steel pipe concrete arch bridge and the construction method are proposed, so it is necessary to improve the assembly and in-place construction quality of the prefabricated assembly type beam of the large-span steel pipe concrete arch bridge. SUMMARY

[0005] The purpose of the present application is to overcome the deficiencies in the prior art and provide a construction method of a prefabricated assembly type beam of a large-span steel pipe concrete arch bridge.

[0006] The construction method of the prefabricated assembly type beam of the large-span steel pipe concrete arch bridge comprises the following steps:

[0007] Step 1, base prefabrication: construct the base according to the design length of the prefabricated beam, and reserve the base reserved square hole, the upper base screw hole and the lower base screw hole; set up a gantry crane at both ends of the base;

[0008] Step 2, prefabricated assembly type beam formwork setting: install replaceable side form sections on the side form of the beam, and place a steel plate with a hoisting rope bottom sleeve on the reserved square hole; then install the formwork, and install a hoisting rope sleeve fixing plate with a hoisting rope sleeve on the steel reinforcement framework;

[0009] Step three, precast beam positioning: after pouring the precast beam, the lifting rope is inserted into the lifting rope bottom sleeve and the lifting rope sleeve, and is transported by the gantry crane; after arranging the temporary support, the positioning-pouring integrated bottom mold is installed, and then the precast beam is hoisted;

[0010] Step four, end cross beam construction: pouring end cross beam concrete on the bent cap;

[0011] Step five, precast beam wet joint construction: wet joint side formwork and positioning-pouring integrated bottom mold are arranged at the wet joint between the tie beam and the precast beam, and finally the concrete is poured.

[0012] As preferred, in step one, the base formwork is set up according to the design length of the precast beam, and then the concrete is poured and cured; the top of the base is provided with two base reserved square holes, the top surface of the base reserved square hole is provided with a steel plate, and the base reserved square hole below the steel plate is provided with a lifting rope bottom sleeve; the top surface of the steel plate is provided with a steel plate anchor bar, and the base is provided with a plurality of upper base screw holes and lower base screw holes.

[0013] As preferred, in step two, the cross beam side formwork is placed on the base, and a plurality of side formwork support angle steels are arranged therebetween, the replaceable side formwork section is connected with the cross beam side formwork through replaceable side formwork fixing bolts, the replaceable side formwork section and the side formwork reinforcing double spliced channel steels are provided with supporting springs, the top of the side formwork reinforcing double spliced channel steels is provided with a plurality of channel steel reserved screw holes for installing upper adjusting screws on the side formwork top connecting plate, the top surface of the reinforcing double spliced channel steels is provided with side formwork upper counter-pulling screws, and one side of the pulley is provided with a pulley lock plate.

[0014] As preferred, in step two, the end of the cross beam side formwork is provided with an end plate one, the outer side of the end plate one is provided with an end plate two, and the end plate one is provided with a corrugated protection ring and a main reinforcement positioning groove; the end plate two is provided with a main reinforcement reserved hole and a corrugated pipe reserved hole.

[0015] As preferred, in step three, when the formwork of the precast beam is installed, the end plate one is installed first, then the reinforcement is bound and the corrugated pipe is installed, the reinforcement skeleton is checked and accepted, then the cross beam side formwork is pushed, the pulley is locked after sliding to the specified position, then the lifting rope sleeve fixing plate with the lifting rope sleeve is installed on the reinforcement skeleton, the upper base screw and the lower base screw are installed, and finally the end plate two and the side formwork upper counter-pulling screw are installed.

[0016] As preferred, in step three, the temporary support is provided with a Bailey beam at the top, the top surface of the Bailey beam is provided with a bearing beam, the upper part of the bearing beam is provided with a distribution beam, the top surface of the distribution beam is provided with a positioning-pouring integrated bottom mold, the end of the precast beam is arranged on the positioning-pouring integrated bottom mold, and the bearing beam is further provided with a tie beam, and the precast beam is positioned between the tie beams of the two temporary supports.

[0017] As preferred, in step four, the end cross beam is cast at the most end of the prefabricated cross beam, the bent cap construction time interval sets the bent cap pre-embedded pull ring, then sets the sleeper on the end support I-beam, then installs the end cross beam bottom die, the end cross beam side die, the end cross beam side die pre-reserved pull ring is set on the end cross beam side die close to the bent cap, the bent cap pre-embedded pull ring and the end cross beam side die pre-reserved pull ring are set with the flower basket pull rod, the end cross beam side die bottom is provided with the side die self-supporting rod and the weight block, the end cross beam side die bottom is provided with the end cross beam bottom die, the end support I-beam is set below the cross beam bottom die, the sleeper is set on the end support I-beam, the end support I-beam and the end cross beam side die bottom enlarged end are provided with the end cross beam side die connecting screw rod, the cross beam opposite pull bolt is set on the top of the end cross beam side die, and finally the inner die is installed and the end cross beam is cast.

[0018] As preferred, in step five, the tie beam and the pre-embedded steel bar of the prefabricated cross beam are connected with the reserved steel bar to form a wet joint, the wet joint sides are provided with the wet joint side hanging die, the wet joint side hanging die is connected with the positioning-pouring integrated bottom die through the wet joint side hanging die fixing bolt, the hanging die enlarged end of the wet joint side hanging die is attached to the tie beam, the two hanging steel plates on the top of the wet joint side hanging die are placed on the tie beam, and finally the concrete is cast.

[0019] The large-span steel pipe concrete arch bridge prefabricated assembly cross beam is obtained by any of the above methods.

[0020] The beneficial effects of the present application are:

[0021] 1) The upper part of the prefabricated cross beam formwork adopts replaceable side die segments, which can be adjusted within a certain height range, suitable for cross beam prefabrication construction of various beam heights, and improves the utilization rate of materials.

[0022] 2) When the cross beam is prefabricated, the base reserved square hole is pre-embedded with a lifting rope sleeve for cross beam transfer, the lifting rope passes through the lifting rope sleeve to lift the prefabricated cross beam, which protects the beam body during transfer and prevents the lifting rope from sliding.

[0023] 3) The wet joint between the tie beam and the prefabricated cross beam adopts an integral hanging die system, the wet joint side hanging die is connected with the positioning-pouring integrated bottom die through the wet joint side hanging die fixing bolt, which ensures the construction quality of the wet joint. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a large-span steel pipe concrete arch bridge prefabricated assembly cross beam construction overall schematic diagram of the present application;

[0025] Figure 2 is a formwork support schematic diagram;

[0026] Figure 3 is Figure 1 and Figure 2 is a schematic diagram of area A in

[0027] Figure 4 is a schematic diagram of base reserved square hole;

[0028] Figure 5 is Figure 4 is a section view of A-A in the middle;

[0029] Figure 6 is a schematic diagram of end head plate one;

[0030] Figure 7 is a schematic diagram of end head plate two;

[0031] Figure 8 is a schematic diagram of accurate beam dropping;

[0032] Figure 9 is a schematic diagram of hoisting rope arrangement;

[0033] Figure 10 is a schematic diagram of end beam formwork;

[0034] Figure 11 is a side view of precast beam wet joint;

[0035] Figure 12 is a section view of precast beam wet joint.

[0036] 1. precast beam 2. beam side form 3. side form reinforced double split channel steel 4. side form support angle steel 5. support spring 6. half pre-buried triangular frame 7. side form top connecting plate 8. channel steel reserved screw hole 9. upper side form tensioning screw 10. hoisting rope sleeve 11. hoisting rope sleeve fixing plate 12. upper adjusting bolt 13. replaceable side form section 14. replaceable side form fixing bolt 15. pulley 16. pulley locking plate 17. base upper screw reserved hole 18. base 19. base hole protection ring 20. base lower screw 21. base upper screw 22. end head plate one 23. corrugated pipe protection ring 24. main reinforcement positioning groove 25. end head plate two 26. main reinforcement reserved hole 27. corrugated pipe reserved hole 28. steel plate 29. base reserved square hole 30. hoisting rope bottom sleeve 31. steel plate anchor 32. temporary support 33. bailey beam 34. distribution beam 35. bearing beam 36. tie beam 38. hoisting rope 39. positioning-pouring integrated bottom form 40. bottom form support I-beam 41. capping beam 42. end support I-beam 43. sleeper 44. end beam side form 45. capping beam pre-buried pull ring 46. basket pull rod 47. end beam side form reserved pull ring 48. end beam tensioning screw 49. end beam 50. side form self-supporting rod 51. weight block 52. end beam side form connecting screw 53. wet joint side hanging form fixing bolt 54. hanging form enlarged end plate 55. wet joint side hanging form 56. suspended steel plate 57. gantry crane 58. hoisting hook 59. track. DETAILED DESCRIPTION

[0037] The application will be further described in connection with the following examples. The following examples are intended to be illustrative only and are not intended to limit the scope of the application. It will be apparent to those of ordinary skill in the art that numerous modifications can be made without departing from the principles of the application and that the scope of the application should not be limited by the examples.

[0038] Example 1

[0039] As an embodiment, the construction method of the prefabricated and assembled beam of the large-span steel pipe concrete arch bridge comprises the following steps:

[0040] Step 1, base prefabrication: according to the design length of the prefabricated beam, a base formwork is erected, and a base reserved square hole 29, a base upper screw hole 17 and a base lower screw hole are reserved during the erection, and a base hole mouth protection ring 19 is arranged at both ends of the base lower screw hole, and then concrete is poured and cured.

[0041] Arranging a transfer gantry crane: a track for the transfer gantry crane is arranged at both ends of the base, and then the gantry crane is arranged.

[0042] Step 2, prefabricated and assembled beam formwork erection: according to the beam, two suitable specifications of replaceable side form sections 13 are selected and fixed. A steel plate 28 with an anchor bar 31 and a hoisting rope bottom sleeve 30 is placed on the reserved square hole 29; during the formwork installation, the end head plate 1 is installed first, then the reinforcement is bound, and then the corrugated pipe is installed, after the reinforcement skeleton is accepted, the beam side form is pushed, the pulley 15 slides to the specified position and is locked by the pulley lock plate 16, then the hoisting rope sleeve fixing plate 11 with the hoisting rope sleeve 10 is installed on the reinforcement skeleton, and the upper and lower base screws at the bottom are installed, and finally the end head plate 2 and the upper side tensioning screw 9 are installed.

[0043] Step 3, prefabricated beam transfer: after the concrete pouring and curing of the prefabricated beam 2, the hoisting rope 38 is inserted into the hoisting rope bottom sleeve 30 and the hoisting rope sleeve 10, and is transferred by the hook on the gantry crane 57.

[0044] Precise positioning of the prefabricated beam: first, arrange the temporary support 32, and install the Bailey beam, the distribution beam 34, and the bearing beam 35, and install the positioning-pouring integrated bottom form 39 on the top surface of the distribution beam, then hoist the prefabricated beam 1 to make it accurately fall into position.

[0045] Step 4, end middle beam construction: embed a pull ring 45 every 2m during the construction of the bent cap, then set a sleeper 43 on the end support I-beam 42, then install the end beam bottom form, the end beam side form 44, and set the basket pull rod 46, then arrange the weight blocks, finally install the side form connecting screw 52 at the end, the beam tensioning screw 48 at the top, and finally install the inner form, and pour the end beam 49 concrete.

[0046] Step 5: Construction of wet joint of precast beam: After the pre-embedded steel bars of the tie beam are connected to the pre-reserved steel bars of the precast beam, wet joint side hanging formwork 55 is set on both sides of the wet joint. The wet joint side hanging formwork 55 is connected to the positioning-pouring integrated bottom formwork 39 through wet joint side hanging formwork fixing bolts 53. The enlarged end 54 of the wet joint side hanging formwork 55 is close to the tie beam 36. The two hanging steel plates 56 at the top of the wet joint side hanging formwork 55 are placed on the tie beam 36. Finally, concrete is poured.

[0047] Example 2

[0048] As another embodiment, the precast assembled crossbeams of the large-span steel-concrete composite arch bridge obtained by the method in Embodiment 1, such as... Figures 1 to 12 As shown, it mainly includes a precast crossbeam 1, a crossbeam side formwork 2, a support spring 5, a replaceable side formwork section 13, a pulley 15, a base 18, an end plate, a temporary support 32, a Bailey beam 33, a load-bearing beam 35, a lifting rope 38, a positioning-casting integrated bottom formwork 39, a wet joint side lifting formwork 55, a hook 58, a track 59, etc. The precast crossbeam 1 is placed on the base 18. Crossbeam side formwork 2 is set on both sides of the precast crossbeam 1. The outer side of the crossbeam side formwork 2 is provided with a side formwork reinforcing double channel steel 3. The bottom of the reinforcing double channel steel 3 is provided with a pulley 15. The upper part of the crossbeam side formwork 2 is provided with a replaceable side formwork section 13. A precast crossbeam transfer gantry crane 57 is set on the outer side of the crossbeam side formwork 2.

[0049] The base 18 has two pre-reserved square holes 29 at the top, and a steel plate 28 is provided on the top surface of the pre-reserved square holes 29. A hanging rope bottom sleeve 30 is provided in the pre-reserved square holes 29 below the steel plate 28. A hanging rope sleeve fixing plate 11 is provided on the top of the crossbeam side formwork 2. A triangular frame 6 is semi-embedded at the rear of the hanging rope sleeve fixing plate 11. A hanging rope sleeve 10 is provided on the hanging rope sleeve fixing plate 11.

[0050] When the precast crossbeam 1 is hoisted, the hoisting rope 38 is threaded through the bottom sleeve 30 and the sleeve 10 of the hoisting rope, and the gantry crane 57 is connected to the hoisting rope 38 through the hook 58.

[0051] The crossbeam side mold 2 is placed on the base 18, the crossbeam side mold 2 outside is provided with a side mold reinforcing double spliced channel steel 3, a plurality of side mold support angle steels 4 are arranged between the two, the upper part of the crossbeam side mold 2 is provided with a replaceable side mold section 13, the replaceable side mold section 13 and the crossbeam side mold 2 are connected through replaceable side mold fixing bolts 14, the replaceable side mold section 13 and the side mold reinforcing double spliced channel steel 3 are provided with support springs 5, a plurality of channel steel reserved screw holes 8 are arranged at the top of the side mold reinforcing double spliced channel steel 3, the channel steel reserved screw holes 8 are used for installing upper adjusting screws 12 on the side mold top connecting plate 7, the crossbeam side mold 2 top is provided with a hanging rope sleeve fixing plate 11, the rear part of the hanging rope sleeve fixing plate 11 is provided with a half-embedded tripod 6, the hanging rope sleeve fixing plate 11 is provided with a hanging rope sleeve 10, the top surface of the reinforcing double spliced channel steel 3 is provided with a side mold upper opposite pulling screw 9, the bottom of the reinforcing double spliced channel steel 3 is provided with a pulley 15, one side of the pulley 15 is provided with a pulley lock plate 16.

[0052] The base 18 is a cast-in-place concrete structure, two base reserved square holes 29 are arranged in the span, a steel plate 28 is arranged at the top of the base reserved square hole 29, two hanging rope bottom sleeves 30 are arranged at the bottom of the steel plate 28, a steel plate anchor 31 is arranged at the top, a plurality of base upper screw holes 17 and base lower screw holes are arranged on the base 18, a base hole opening protection ring 19 is arranged at the hole opening of the base lower screw hole, a base upper screw 21 is arranged in the base upper screw hole 17, and a base lower screw 20 is arranged in the base lower screw hole.

[0053] The end of the crossbeam side mold 2 is provided with an end plate one 22, the outer side of the end plate one 22 is provided with an end plate two 25, the end plate one 22 is provided with a corrugated protection ring 23 and a main reinforcement positioning groove 24; the end plate two 25 is provided with a main reinforcement reserved hole 26 and a corrugated pipe reserved hole 27.

[0054] The temporary support 32 is provided with a bailey beam 33 at the top, the bailey beam 33 is provided with a bearing beam 35 at the top, the bearing beam 35 is provided with a distribution beam 34 at the upper part, the distribution beam 34 is provided with a positioning-pouring integrated bottom mold 39 at the top, the prefabricated crossbeam 1 is arranged on the positioning-pouring integrated bottom mold 39, the bearing beam 35 is also provided with a tie beam 36, the prefabricated crossbeam 1 is arranged between the tie beams 36 of the two temporary supports 32, the hanging rope bottom sleeve 30 and the hanging rope sleeve 10 are provided with a hanging rope 38.

[0055] The precast beam 1 is provided with a cast-in-place end beam 49 at the end, and an end beam side form 44 is arranged outside the end beam 49. Two end beam side form reserved pull rings 47 are arranged every 2m on the end beam side form 44 close to the cap beam 41. Cap beam embedded pull rings 45 are arranged every 2m on the cap beam 41. A basket pull rod 46 is arranged between the cap beam embedded pull ring 45 and the end beam side form reserved pull ring 47. The end beam side form 44 is L-shaped, and a side form self-supporting rod 50 and a weight block 51 are arranged at the bottom. A beam counter-pulling bolt 48 is arranged at the top of the end beam side form 44, and an end beam bottom form is arranged at the bottom of the end beam side form 44. An end support I-beam 42 is arranged below the end beam bottom form, and a sleeper 43 is arranged on the end support I-beam 42. An end beam side form connecting screw rod 52 is arranged between the end support I-beam 42 and the enlarged end of the bottom of the end beam side form 44.

[0056] The precast beam 1 and the beams 36 at both ends are provided with a wet joint, and wet joint side hanging forms 55 are arranged on both sides of the wet joint. A positioning-pouring integrated bottom form 39 is arranged at the bottom of the wet joint side hanging form 55, and the two are connected by a wet joint side hanging form fixing bolt 53. A hanging form enlarged end 54 is arranged at the end of the wet joint side hanging form 55 close to the beam 36, and two suspension steel plates 56 are arranged at the top of the wet joint side hanging form 55, one end of the suspension steel plate 56 being arranged on the beam 36.

[0057] It should be noted that the same or similar parts in the embodiment and the first embodiment can be mutually referred to, and will not be described in detail in the present application.

[0058] The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be mutually referred to.

Claims

1. A construction method of a large-span steel pipe concrete arch bridge precast assembly beam, characterized in that It comprises the following steps: Step one, base prefabrication: according to the design length of the prefabricated beam, the base is constructed, and the base reserved square hole, the upper base screw hole and the lower base screw hole are reserved; gantry crane is set at both ends of the base; according to the design length of the prefabricated beam, the base formwork is erected, then the concrete is poured and cured; two base reserved square holes are provided at the top of the base, a steel plate is provided at the top surface of the base reserved square hole, and a lifting rope bottom sleeve is provided in the base reserved square hole below the steel plate; a steel plate anchor bar is provided on the top surface of the steel plate; a plurality of upper base screw holes and lower base screw holes are provided on the base; Step two, prefabricated assembly type beam formwork erection: install replaceable side form segment on the beam side form, and place the steel plate with lifting rope bottom sleeve on the reserved square hole; then install the formwork, and install the lifting rope sleeve fixing plate with lifting rope sleeve on the steel reinforcement framework; the beam side form is placed on the base, the side form reinforcing double spliced channel steel is arranged outside the beam side form, a plurality of side form support angle steels are arranged therebetween, the replaceable side form segment is connected with the beam side form through replaceable side form fixing bolt, the replaceable side form segment and the side form reinforcing double spliced channel steel are provided with supporting springs, a plurality of channel steel reserved screw holes are provided at the top of the side form reinforcing double spliced channel steel, the channel steel reserved screw holes are used for installing the upper adjusting screw on the side form top connecting plate, the side form reinforcing double spliced channel steel top is provided with a side form upper counter pull screw, the side form reinforcing double spliced channel steel bottom is provided with a pulley, one side of the pulley is provided with a pulley lock plate; the end of the beam side form is provided with an end plate one, the outer side of the end plate one is provided with an end plate two, the end plate one is provided with a corrugated protection ring and a main reinforcement positioning groove; the end plate two is provided with a main reinforcement reserved hole and a corrugated pipe reserved hole; when the formwork of the prefabricated beam is installed, the end plate one is installed first, then the reinforcement is bound and the corrugated pipe is installed, the steel reinforcement framework is accepted, the beam side form is pushed, the pulley is locked after sliding to the specified position, then the lifting rope sleeve fixing plate with lifting rope sleeve is installed on the steel reinforcement framework, the upper base screw and the lower base screw are installed, and finally the end plate two and the side form upper counter pull screw are installed; Step three, prefabricated beam positioning: after pouring the prefabricated beam, the lifting rope is inserted into the lifting rope bottom sleeve and the lifting rope sleeve, and is transferred by the gantry crane; after arranging the temporary support, the positioning-pouring integrated bottom die is installed, and then the prefabricated beam is hoisted; Step four, end beam construction: pouring end beam concrete on the bent cap; Step five, prefabricated beam wet joint construction: wet joint side form and positioning-pouring integrated bottom die are arranged at the wet joint between the tie beam and the prefabricated beam, and finally the concrete is poured.

2. The construction method of the precast assembly type beam of the long-span steel pipe concrete arch bridge according to claim 1, characterized in that, In step three, the temporary support is provided with a Bailey beam, the top surface of the Bailey beam is provided with a bearing beam, the upper part of the bearing beam is provided with a distribution beam, the top surface of the distribution beam is provided with a positioning-pouring integrated bottom die, the end of the prefabricated beam is arranged on the positioning-pouring integrated bottom die, and the tie beam is further arranged on the bearing beam, and the prefabricated beam is positioned between the tie beams of the two temporary supports.

3. The construction method of the precast assembly type beam of the long-span steel pipe concrete arch bridge according to claim 1, characterized in that, In step four, the end cross beam is cast at the most end of the prefabricated cross beam, the bent cap is constructed with time interval, the bent cap embedded pull ring is set, then the sleeper is set on the end support I-beam, then the end cross beam bottom form is installed, the end cross beam side form is installed, the end cross beam side form near the bent cap is set with interval, the end cross beam side form reserved pull ring is set, the flower basket pull rod is set between the bent cap embedded pull ring and the end cross beam side form reserved pull ring, the end cross beam side form bottom is provided with the side form self-supporting rod and the weight block, the end cross beam side form bottom is provided with the end cross beam bottom form, the end support I-beam is set under the cross beam bottom form, the sleeper is set on the end support I-beam, the end cross beam side form connecting screw rod is set between the end support I-beam and the end cross beam side form bottom enlarged end, the cross beam opposite-pulling bolt is set on the top of the end cross beam side form, finally the inner form is installed, and the end cross beam is cast.

4. The construction method of the precast assembly type beam of the long-span steel pipe concrete arch bridge according to claim 1, characterized in that, In step five, the tie beam and the prefabricated cross beam are connected through the embedded steel bar and the reserved steel bar to form a wet joint, the wet joint side hanging form is set on both sides of the wet joint, the wet joint side hanging form is connected with the positioning-pouring integrated bottom form through the wet joint side hanging form fixing bolt, the hanging form enlarged end of the wet joint side hanging form is attached to the tie beam, the two hanging steel plates on the top of the wet joint side hanging form are placed on the tie beam, and finally the concrete is cast.

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