A construction method for a railway hybrid beam steel-concrete combined section with a steel shell formwork

Abstract

The present invention belongs to the technical field of bridge construction, and in particular, relates to a construction method for a railway hybrid beam steel-concrete combination section with a steel shell formwork, comprising the following steps: S1, making a steel shell; S2, using a hanging basket crane to hoist the made steel shell to the designed position, burying one end of the steel shell in a concrete formwork, and then pouring a concrete beam in the concrete formwork; S3, locking the hanging basket crane on the concrete beam, and using the hanging basket crane to hoist the steel beam; S4, hoisting the steel beam to the designed position and locking the hanging basket crane, fine-tuning the steel beam, and fixing the steel beam to the other end of the steel shell; S5, converting the hanging basket crane and the steel shell into a wet joint formwork system, pouring and curing wet joint concrete; S6, dismantling the wet joint formwork system, and completing the construction of the steel-concrete combination section. Using a steel shell instead of a cantilever beam as a temporary fixing device for the steel-concrete combination section can share the load during the pouring of wet joint concrete, improve construction safety, shorten the construction period, and reduce construction difficulty.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for a steel-concrete combined section of a railway hybrid beam with a steel shell formwork. Background Art

[0002] At present, when constructing the steel-concrete joint section of a railway hybrid beam bridge, before pouring the heavy wet joint concrete, a cantilever beam is usually installed as a temporary fixing device for the steel-concrete joint section, and the cantilever beam and hanging basket are used to bear the load during the pouring of the wet joint concrete. In order to bear the heavy load, the cantilever beam often uses a larger box-section steel beam, which needs to be anchored on the cantilever concrete beam and the steel beam respectively. In addition, after pouring the wet joint concrete, in order to facilitate the construction of the next section, the cantilever beam needs to be removed again, and the whole process takes up a lot of construction time.

[0003] Therefore, it is necessary to design a construction method for the steel-concrete combined section of a railway hybrid beam with a steel shell formwork to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for a steel-concrete combined section of a railway hybrid beam with a steel shell formwork to solve the above-mentioned problems, thereby reducing the construction difficulty of the steel-concrete combined section and shortening the construction period, and ensuring the construction safety of the steel-concrete combined section.

[0005] To achieve the above object, the present invention provides the following scheme: a construction method of a railway hybrid beam steel-concrete combined section with a steel shell formwork, comprising the following steps:

[0006] S1, making steel shell;

[0007] S2. Use a hanging basket crane to hoist the prepared steel shell to the designed position, bury one end of the steel shell in the concrete formwork, and then pour the concrete beam in the concrete formwork;

[0008] S3, lock the basket crane on the concrete beam, and use the basket crane to lift the steel beam;

[0009] S4. Hoist the steel beam to the designed position and lock the hanging basket crane, make fine adjustments to the steel beam, and fix the steel beam to the other end of the steel shell;

[0010] S5. Convert the hanging basket crane and steel shell into a wet joint formwork system to pour and maintain wet joint concrete;

[0011] S6. Remove the wet joint formwork system and complete the construction of the steel-concrete joint section.

[0012] Preferably, in S1, the steel shell includes a flat bottom plate, a vertical web plate and an inclined bottom plate, the flat bottom plate and the vertical web plate are welded with welding nails and ribs in the longitudinal bridge direction, and the assembly order of the steel shell is flat bottom plate-vertical web plate-inclined bottom plate.

[0013] Preferably, in S2, after the outer formwork of the concrete formwork is made, the made steel shell is hoisted to the designed position by a hanging basket crane, the outer wall of the steel shell is fitted with the inner wall of the outer formwork, one end of the steel shell welded with the rivet is buried in the concrete formwork, and then the steel bars are tied, the prestressed pipes and prestressed steel bundles are installed, and the inner formwork of the concrete formwork is made, and then the concrete beam is poured in the inner formwork and maintained.

[0014] Preferably, in S3, the basket crane includes inner and outer guide beams, a bottom formwork platform, and inner and outer formwork systems. The basket crane is moved as a whole and locked on the concrete beam, and a lifting system is installed on the basket crane. The steel beam to be installed is transported to the bottom of the bridge to be installed, and lifting ears are installed on the steel beam. The lifting system is lowered and the steel beam is lifted by the lifting ears.

[0015] Preferably, in S4, the load is applied in stages during the process of hoisting the steel beam to the designed position. After the steel beam is hoisted to the designed position, it is welded to the end of the steel shell with ribs. The welding sequence is flat bottom plate-vertical web plate-inclined bottom plate. After welding is completed, the lifting hanger on the lifting ear is removed.

[0016] Preferably, in S5, the bottom formwork platform and the outer formwork of the inner and outer formwork system are moved to the wet joint position, the bottom formwork platform, the outer formwork of the inner and outer formwork system, and the steel shell are converted into a wet joint formwork system, the wet joint formwork system is locked on the steel beam and the concrete beam, the steel bars are tied, the prestressed pipes and prestressed steel bundles are installed, and the wet joint concrete is poured and cured.

[0017] Preferably, in S6, after the wet joint concrete reaches the design strength, the wet joint formwork system is removed, the prestressed steel strands are tensioned, and the construction of the steel-concrete joint section is completed.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] The present invention assembles a steel shell on a water platform, which is similar in shape to the outer contour of a steel beam and has a longitudinal length slightly longer than the length of a wet joint section. After setting up the outer formwork of a cantilever concrete beam, a hanging basket crane is used to hoist the steel shell to a designed height. One end of the steel shell is connected to the concrete beam, and the other end is butt-welded to the steel beam hoisted in place. First, the steel shell can be assembled on the water platform, which is different from the previous construction method that requires the installation and anchoring of cantilever beams on concrete beams and steel beams, greatly reducing the construction difficulty. Secondly, the steel shell can share the weight of the steel beam and the wet joint concrete during the construction of the steel-concrete combined section with the hanging basket crane, which is beneficial to the construction of a steel-concrete combined section with a higher beam height and a heavier weight, and improves the safety of the construction. Finally, the steel shell can be used as an outer formwork for wet joint concrete, shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0021] Figure 1 This is a schematic diagram of the steel shell of the present invention being hoisted into place;

[0022] Figure 2 This is a schematic diagram of the steel beam of the present invention being hoisted into place;

[0023] Figure 3 This is a schematic diagram of pouring wet joint concrete according to the present invention;

[0024] Figure 4 This is a schematic diagram of removing the formwork after the wet joint concrete pouring of the present invention is completed;

[0025] Figure 5 It is a cross-sectional schematic diagram of the steel beam of the present invention being hoisted into place;

[0026] Figure 6 is a schematic cross-sectional view of a steel shell of the present invention;

[0027] Figure 7 It is a schematic cross-sectional view of the connection position between the steel shell and the concrete beam of the present invention.

[0028] Among them, 1. Basket crane; 11. Main truss; 12. Rear anchoring system; 13. Sliding and walking system; 14. Bottom form platform; 15. Inner and outer form system; 16. Hanging system; 17. Lifting system; 3. Steel shell; 4. Steel beam; 5. Concrete beam; 6. Steel-concrete combined section; 7. Web stiffening ribs; 8. Bottom plate stiffening ribs; 9. Welding nails. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figures 1 to 7 As shown, the present invention provides a method for constructing a steel-concrete combined section of a railway hybrid beam with a steel shell formwork, comprising the following steps

[0032] S1, making a steel shell 3;

[0033] S2, using the hanging basket crane 1 to hoist the prepared steel shell 3 to the designed position, burying one end of the steel shell 3 in the concrete formwork, and then pouring the concrete beam 5 in the concrete formwork;

[0034] S3, locking the basket crane 1 on the concrete beam 5, and using the basket crane 1 to hoist the steel beam 4;

[0035] S4, hoist the steel beam 4 to the designed position and lock the hanging basket crane 1, make fine adjustments to the steel beam 4, and fix the steel beam 4 to the other end of the steel shell 3;

[0036] S5, converting the hanging basket crane 1 and the steel shell 3 into a wet joint formwork system, pouring and curing wet joint concrete;

[0037] S6. Remove the wet joint formwork system and complete the construction of the steel-concrete joint section.

[0038] The present invention assembles a section of steel shell 3 on the water platform, which is similar in shape to the outer contour of the steel beam 4 and has a longitudinal length slightly longer than the length of the wet joint section. After setting up the outer formwork of the cantilever concrete beam 5, the steel shell 3 is hoisted to the designed height using the hanging basket crane 1. One end of the steel shell 3 is connected to the concrete beam 5, and the other end is butt-welded to the hoisted steel beam 4. First, the steel shell 3 can be assembled on the water platform, which is different from the previous construction method that requires the installation and anchoring of the cantilever beam on the concrete beam 5 and the steel beam 4, greatly reducing the construction difficulty. Secondly, the steel shell 3 can share the weight of the steel beam 4 and the wet joint concrete during the construction of the steel-concrete combined section 6 with the hanging basket crane 1, which is conducive to the construction of the steel-concrete combined section with a higher beam height and a larger weight, and improves the safety of the construction. Finally, the steel shell 3 can be used as an outer formwork for wet joint concrete, shortening the construction period.

[0039] Further optimizing the scheme, in S1, the steel shell 3 includes a flat bottom plate, a vertical web plate and an inclined bottom plate, the flat bottom plate and the vertical web plate are welded with welding nails 9 and ribs in the longitudinal bridge direction, and the assembly order of the steel shell 3 is flat bottom plate-vertical web plate-inclined bottom plate.

[0040] The shape of the steel shell 3 is similar to the outer contour of the steel beam 4, and the longitudinal length is slightly longer than the length of the wet joint section. The thickness of the flat bottom plate, vertical web plate and inclined bottom plate is the same as the thickness of the corresponding plate of the steel beam 4. The welding nail 9 has a diameter of 22mm, a length of 120mm, and a spacing of 200mm. The rib plate includes a web stiffening rib 7 and a bottom plate stiffening rib 8. The web stiffening rib 7 is arranged on the vertical web plate, and the bottom plate stiffening rib 8 is arranged on the flat bottom plate. The rib plate height is 150mm and the thickness is 12mm.

[0041] To further optimize the solution, in S2, after the outer formwork of the concrete formwork is made, the made steel shell 3 is hoisted to the designed position by using the hanging basket crane 1, the outer wall of the steel shell 3 is fitted with the inner wall of the outer formwork, and one end of the steel shell 3 welded with the welding nail 9 is buried in the concrete formwork, and then the steel bars are tied, the prestressed pipes and prestressed steel bundles are installed, and the inner formwork of the concrete formwork is made, and then the concrete beam 5 is poured in the inner formwork and maintained.

[0042] According to a further optimization scheme, in S3, the basket crane 1 includes inner and outer guide beams, a bottom formwork platform 14, and an inner and outer formwork system 15. The basket crane 1 is moved as a whole and locked on the concrete beam 5, and a lifting system 17 is installed on the basket crane 1. The steel beam 4 to be installed is transported to the bottom of the bridge to be installed, and lifting ears are installed on the steel beam 4. The lifting system 17 is lowered, and the steel beam 4 is lifted by the lifting ears.

[0043] The basket crane 1 also includes a rear anchoring system 12 and a sliding and walking system 13. The sliding and walking system 13 serves as a walking track for the basket crane 1 on the hybrid beam. When hoisting the steel shell 3, a hanging system 16 is installed at the working end of the basket crane 1. When hoisting the steel beam 4, the hanging system 16 is replaced by a lifting system 17.

[0044] A lifting lug is arranged just below the lifting system 17 and close to the web of the steel beam 4 , and the lifting lug is welded and fixed to the top plate of the steel beam 4 . A stiffening plate is arranged to strengthen the top plate of the steel beam 4 at the position of the lifting lug at the side web, and is welded to the steel beam 4 .

[0045] To further optimize the solution, in S4, the load is applied in stages during the process of hoisting the steel beam 4 to the designed position. After the steel beam 4 is hoisted to the designed position, it is welded to the end of the steel shell 3 with the ribs. The welding sequence is flat bottom plate-vertical web plate-inclined bottom plate. After welding, the lifting hanger on the lifting lug is removed.

[0046] Two continuous jacks are arranged on the front upper crossbeam of the basket crane 1 near the main truss 11 of the crane as lifting devices for the steel beam 4. The lifting process should be loaded in stages (symmetrically on both sides), according to the load stage loading of 20%→40%→60%→80%→100%. During the loading process, the steel beam 4 and the lifting system 17 are observed, and loading can only be continued if there is no abnormality. During the lifting process, the loads applied at both ends are kept basically the same to ensure that the steel beam 4 rises smoothly. The lifting system 17 consists of a lifting control system, a continuous jack, a lifting pressure sensor, a steel strand, a steel strand reel and a hoist. During the lifting process, the loads applied to the left and right groups of lifting systems 17 on the steel beam 4 are kept basically the same. After the steel beam 4 is lifted to the designed height, the lifting system 17 is temporarily locked.

[0047] After the steel beam 4 reaches the designed position, the steel beam 4 is butt-welded to the end of the steel shell 3 with the ribs. The welding sequence is: flat bottom plate → vertical web plate → inclined bottom plate. During the welding process, the steel shell 3 is ensured to be completely aligned with the steel beam 4. Before welding, the steel beam 4 after lifting is ensured to be on the same vertical line as the steel beam 4 before lifting. The axis, elevation, transverse slope and longitudinal slope of the steel beam 4 are checked with a total station and a level. If they do not meet the requirements, the lifting system 17 is used for fine adjustment. After confirming that the review or adjustment meets the design and monitoring requirements, the end of the steel shell 3 with the ribs is butt-welded to the steel beam 4 to complete the rigid connection between the steel beam 4 and the concrete beam 5.

[0048] The connection portion between the hanger of the hanging basket crane 1 and the ear plate of the steel beam 4 is untied, and the hanger of the hanging basket crane 1 is removed, so that the steel beam 4 is connected to the concrete beam 5 only by the steel shell 3.

[0049] To further optimize the solution, in S5, the bottom formwork platform 14 and the outer formwork of the inner and outer formwork system 15 are moved to the wet joint position, the bottom formwork platform 14, the outer formwork of the inner and outer formwork system 15, and the steel shell 3 are converted into a wet joint formwork system, the wet joint formwork system is locked on the steel beam 4 and the concrete beam 5, the steel bars are tied, the prestressed pipes and prestressed steel strands are installed, and the wet joint concrete is poured and cured.

[0050] The bottom formwork platform 14 and the outer formwork of the inner and outer formwork system 15 that were originally retreated are moved forward to the wet joint position, and the bottom formwork platform 14 and the outer formwork of the inner and outer formwork system 15 are modified to serve as the formwork system for pouring the wet joint together with the steel shell 3, and then the wet joint formwork system is locked on the bottom plates of the concrete beam 5 and the steel beam 4, and the wet joint formwork system is connected to the hanging basket crane 1. The steel shell 3 serves as the outer formwork for pouring concrete, and the outer formwork of the inner and outer formwork system 15 only provides support for the steel shell 3 during the pouring process.

[0051] Tie the steel bars, install the prestressed pipes and prestressed steel strands, move the inner mold of the inner and outer mold system 15 that was originally retreated forward to the wet joint position, fix the inner and outer mold system 15, and start pouring the wet joint concrete and curing.

[0052] To further optimize the plan, in S6, after the wet joint concrete reaches the design strength, the wet joint formwork system is removed, the prestressed steel strands are tensioned, and the construction of the steel-concrete joint section is completed.

[0053] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. A construction method for a railway hybrid beam steel-concrete combined section with a steel shell formwork, characterized in that: The following steps are included S1, making a steel shell (3); S2, using a hanging basket crane (1) to hoist the manufactured steel shell (3) to the designed position, burying one end of the steel shell (3) in a concrete formwork, and then pouring a concrete beam (5) in the concrete formwork; S3, locking the basket crane (1) on the concrete beam (5), and using the basket crane (1) to lift the steel beam (4); S4, hoisting the steel beam (4) to the designed position and locking the hanging basket crane (1), fine-tuning the steel beam (4), and fixing the steel beam (4) to the other end of the steel shell (3); S5, converting the hanging basket crane (1) and the steel shell (3) into a wet joint formwork system, and pouring and curing wet joint concrete; S6. Remove the wet joint formwork system and complete the construction of the steel-concrete joint section; In S1, the steel shell (3) includes a flat bottom plate, a vertical web plate and an inclined bottom plate, the flat bottom plate and the vertical web plate are both welded with welding nails (9) and ribs in the longitudinal bridge direction, and the assembly order of the steel shell (3) is flat bottom plate-vertical web plate-inclined bottom plate; In S2, after the outer formwork of the concrete formwork is manufactured, the manufactured steel shell (3) is hoisted to the designed position by using a hanging basket crane (1), the outer wall of the steel shell (3) is fitted with the inner wall of the outer formwork, one end of the steel shell (3) welded with the welding nail (9) is buried in the concrete formwork, and then the steel bars are tied, the prestressed pipe and the prestressed steel bundle are installed, and the inner formwork of the concrete formwork is manufactured, and then the concrete beam (5) is poured in the inner formwork and maintained; In S3, the basket crane (1) includes inner and outer guide beams, a bottom formwork platform (14), and an inner and outer formwork system (15). The basket crane (1) is moved as a whole and locked on the concrete beam (5), and a lifting system (17) is installed on the basket crane (1). The steel beam (4) to be installed is transported to the bottom of the bridge to be installed, and a lifting lug is installed on the steel beam (4). The lifting system (17) is lowered, and the steel beam (4) is lifted by the lifting lug. In S5, the bottom formwork platform (14) and the outer formwork of the inner and outer formwork system (15) are moved to the wet joint position, the bottom formwork platform (14), the outer formwork of the inner and outer formwork system (15), and the steel shell (3) are converted into a wet joint formwork system, the wet joint formwork system is locked on the steel beam (4) and the concrete beam (5), the steel bars are tied, the prestressed pipes and prestressed steel strands are installed, and the wet joint concrete is poured and cured.

2. The method for constructing a railway hybrid beam steel-concrete combined section with a steel shell formwork according to claim 1, characterized in that: In S4, the load during the process of hoisting the steel beam (4) to the design position is applied in stages. After the steel beam (4) is hoisted to the design position, it is welded to the end of the steel shell (3) welded with the ribs. The welding sequence is flat bottom plate-vertical web plate-inclined bottom plate. After the welding is completed, the lifting hanger on the lifting lug is removed.

3. The method for constructing a railway hybrid beam steel-concrete combined section with a steel shell formwork according to claim 1, characterized in that: In S6, after the wet joint concrete reaches the design strength, the wet joint formwork system is removed, the prestressed steel tendons are tensioned, and the construction of the steel-concrete joint section is completed.

Images