Steel-concrete combined arch seat structure and construction method thereof

Abstract

The present application belongs to the technical field of arch bridge structure, and particularly relates to a steel-concrete combined arch seat structure and a construction method thereof. The arch seat structure is connected with the bearing platform, and the vertical and horizontal support forces of the arch seat structure have a stable foundation. The fixed steel pipe is filled with concrete, and the structural strength of the connection mode is further improved. In addition, the present application also provides a construction method of the steel-concrete combined arch seat structure. The steps of the construction method include positioning the fixed steel pipe, positioning the steel structure box unit, installing the arch rib pipe, pouring concrete, and compacting and curing the concrete. Finally, the arch seat structure and the installation mode have sufficient structural stability.

Description

Technical Field

[0001] This invention belongs to the field of arch bridge structure technology, and particularly relates to a steel-concrete composite arch seat structure and its construction method. Background Technology

[0002] The structure of a typical arch bridge mainly consists of an arch base, an arch ring, and the main body of the bridge. Based on the relative height of the arch ring and the main body, arch bridges can be further classified into upper-deck, mid-deck, and lower-deck types.

[0003] On the other hand, the auxiliary structures of an arch bridge can also include arch ribs and abutments. Arch ribs reinforce the arch ring, serving as its framework. However, when the soil conditions at the arch bridge construction site are relatively poor, the arch abutments cannot be directly placed on the original soil layer; otherwise, unstable and incomplete support from the arch abutments can easily occur. In this case, abutments can be constructed first on the relatively thin original soil layer, and then the arch abutments can be built on top of the abutments.

[0004] Correspondingly, in the actual construction process of arch bridges, the arch seat and arch rib can also be collectively referred to as the arch seat or arch seat structure.

[0005] The existing, relatively advanced arch abutment structure is the steel-concrete composite arch abutment. Its most basic advantage is that it combines the tensile strength of steel structures with the compressive strength of concrete.

[0006] For example, Chinese invention patent with publication number CN114250690A and publication date of March 29, 2022 discloses a steel-concrete composite arch seat suitable for steel-concrete composite arch bridges. Its structure includes: a core steel arch seat, with concrete poured inside and concrete poured on the outside. The core steel arch seat includes a top plate and a bottom plate arranged opposite to each other. Multiple web plates are arranged between the top plate and the bottom plate. The two sides of the web plates are sealed by side plates and pressure plates. The pressure plates are inclined and force transmission plates are fixedly arranged inside the pressure plates.

[0007] The advantages of the steel-concrete composite arch abutment in this invention patent mainly include: 1. Fully utilizing the superior performance of both steel plates and concrete; 2. Filling the arch abutment with concrete can enhance its stability, while the arch abutment's constricting effect on the concrete puts the concrete in a triaxial compression state, thereby giving it higher compressive strength and resistance to deformation; 3. The transverse quantity, size, and inclination angle of the arch abutment bearing plate can be freely adjusted according to the number and position of the steel-concrete tubes in the arch rib.

[0008] However, in actual construction and use, this steel-concrete composite arch has at least the following deficiency, which is the technical problem that this invention aims to solve:

[0009] When used in conjunction with a pier cap, it can only provide simple vertical support on the pier cap and cannot be integrated with the pier cap. Therefore, when subjected to lateral thrust, it cannot be transferred to the pier cap, which makes it difficult to improve the structural strength of the entire arch bridge.

[0010] Therefore, in summary, there is an urgent need for a new type of steel-concrete arch seat that can be connected to the existing pier with high strength. Summary of the Invention

[0011] This invention provides a steel-concrete composite arch support structure, which, by setting arch ribs, concrete sections inside the ribs, concrete blocks inside the arch support, fixed steel pipes, horizontal diaphragm units, and vertical diaphragm units on a steel structure box unit, enables: 1. The arch support structure to be fully connected to the foundation, ensuring a stable foundation for both vertical and horizontal support forces; 2. The fixed steel pipes to be fully filled with concrete, further enhancing the structural strength of the above connection method.

[0012] In addition, the present invention also provides a construction method for the above-mentioned steel-concrete composite arch seat structure, the steps of which include: fixing the positioning of the steel pipe, positioning the steel structure box unit, installing the arch rib pipe, pouring concrete, and vibrating and compacting the concrete for curing, so that the arch seat structure itself and the installation method have sufficient structural stability.

[0013] The technical solution adopted by the present invention to solve the above problems is: a steel-concrete composite arch seat structure, including an arch rib tube, a concrete section inside the tube, and a concrete block inside the arch seat, and further including a steel structure box unit with the concrete block inside the arch seat inside and used for inserting the arch rib tube, a fixed steel pipe inserted into the steel structure box unit and used for connecting the bearing platform, a transverse diaphragm unit set inside the steel structure box unit and used for sleeved on the fixed steel pipe, and a vertical diaphragm unit set on the transverse diaphragm unit and used for concrete filling operation of the fixed steel pipe by sleeved on the arch rib tube.

[0014] A further preferred technical solution is that the steel structure box unit includes a bottom plate, a first lower vertical plate, a lower inclined plate, a first upper vertical plate, an upper inclined plate and a top plate arranged sequentially from bottom to top on the bottom plate, and two closed web plates arranged on the bottom plate.

[0015] A further preferred technical solution is that the steel structure box unit further includes a fixing hole disposed on the bottom plate for inserting the fixing steel pipe, an installation hole disposed on the lower inclined plate for inserting the arch rib pipe and for adding concrete into the fixing steel pipe, and a connecting hole disposed on the upper inclined plate for pouring concrete blocks in the arch seat.

[0016] A further preferred technical solution is that the steel structure box unit also includes a casting hole provided on the top plate.

[0017] A further preferred technical solution is that the transverse partition unit includes a lower transverse plate disposed on the two first lower vertical plates, an upper transverse plate disposed on the two first upper vertical plates, a reinforcing hole disposed on the lower transverse plate for inserting the fixed steel pipe, and a concrete drop hole disposed on the lower transverse plate and the upper transverse plate.

[0018] A further preferred technical solution is that the vertical partition unit includes a second lower vertical plate disposed on the bottom plate and the lower horizontal plate, a middle vertical plate disposed on the lower horizontal plate and the upper horizontal plate, and a second upper vertical plate disposed on the upper horizontal plate and the top plate.

[0019] A further preferred technical solution is that the vertical partition unit further includes a positioning vertical plate disposed on the upper surface of the lower horizontal plate and used to block the insertion end of the arch rib tube, and a limiting vertical perforated plate disposed on the upper surface of the lower horizontal plate and used to fit the arch rib tube.

[0020] A further preferred technical solution is that: stiffening ribs are provided on the lower horizontal plate, upper horizontal plate, second lower vertical plate, middle vertical plate, second upper vertical plate, positioning vertical plate and limiting vertical hole plate.

[0021] A construction method for a steel-concrete composite arch abutment structure includes the following steps in sequence.

[0022] S1. Positioning of the fixed steel pipe: Before the foundation is cured, the fixed steel pipe is vertically inserted and at least 1 / 3 of its length is exposed. Then, the vertical angle of the fixed steel pipe is reinforced until the foundation is cured.

[0023] S2. Positioning of steel structure box unit: The steel structure box unit is sleeved on the fixed steel pipe until the steel structure box unit is pressed on the surface of the bearing platform;

[0024] S3. Install the arch rib tube: Install and fix the arch rib tube on the steel structure box unit;

[0025] S4. Pouring concrete: Add concrete into the arch rib tube so that the fixed steel pipe, the steel structure box unit and the arch rib tube are filled with concrete in sequence.

[0026] S5. Concrete vibration compaction and curing: The concrete is first vibrated and compacted in the arch rib tube and / or steel structure box unit, and then cured to finally obtain the steel-concrete composite arch seat structure.

[0027] A further preferred technical solution is: S4, during concrete pouring, concrete is also added at the steel structure box unit. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a schematic diagram showing the position of the fixed steel pipe in this invention.

[0030] Figure 3 This is a structural schematic diagram of the steel structure box unit in this invention.

[0031] Figure 4 This is a schematic diagram of the operation method of fixing the steel pipe and pouring concrete in advance in this invention.

[0032] Figure 5 This is a structural schematic diagram of a possible hollow section in the fixed steel pipe of the present invention. When the concrete inside the fixed steel pipe is poured together with the concrete block inside the arch seat, the hollow section is likely to appear.

[0033] Figure 6 This is a top-down view showing the position and structure of the transverse partition unit in this invention.

[0034] Figure 7 This is a top-down view of the structure of the upper horizontal plate in this invention.

[0035] Figure 8 This is a schematic diagram of the position and structure of the vertical partition unit in this invention.

[0036] The meanings of the markings in the diagram are as follows:

[0037] Foundation a, hollow section b;

[0038] 11. Arch rib tube; 12. Concrete section inside the tube; 13. Concrete block inside the arch seat;

[0039] Steel structure box unit 1, fixed steel pipe 2, horizontal partition unit 3, vertical partition unit 4, stiffening rib 5, connecting rod 6;

[0040] Base plate 101, first lower vertical plate 102, lower inclined plate 103, first upper vertical plate 104, upper inclined plate 105, top plate 106, closed web plate 107, fixing hole 108, mounting hole 109, connecting hole 110, pouring hole 111;

[0041] Lower horizontal plate 301, upper horizontal plate 302, reinforcement hole 303, concrete drop hole 304;

[0042] Second lower vertical plate 401, middle vertical plate 402, second upper vertical plate 403, positioning vertical plate 404, and limiting vertical perforated plate 405. Detailed Implementation

[0043] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0044] As attached Figure 1-8 As shown, a steel-concrete composite arch support structure includes an arch rib tube 11, a concrete section 12 inside the tube, and a concrete block 13 inside the arch support. It also includes a steel structure box unit 1 with the concrete block 13 inside the arch support inside and for inserting the arch rib tube 11, a fixed steel pipe 2 inserted into the steel structure box unit 1 and for connecting the pier a, a transverse diaphragm unit 3 set inside the steel structure box unit 1 and for sleeved on the fixed steel pipe 2, and a vertical diaphragm unit 4 set on the transverse diaphragm unit 3 and for filling the fixed steel pipe 2 with concrete by sleeved on the arch rib tube 11.

[0045] In this embodiment, the arch rib tube 11 is the main skeleton of the arch ring. The "steel-concrete composite" feature of the arch seat structure is reflected in both the arch rib tube 11 and the steel structure box unit 1. That is, the arch rib tube 11 is filled with a concrete section 12, and the steel structure box unit 1 is filled with a concrete block 13.

[0046] Secondly, the steel structure box unit 1 is enclosed, and its function is to hold and cover the concrete structure, ultimately improving the structural strength and long-term stability of the steel-concrete composite structure.

[0047] Furthermore, the steel structure box unit 1 is prefabricated in the factory, then transported to the construction site, and finally concrete is poured. During the prefabrication of the steel structure box unit 1, the horizontal diaphragm unit 3 and the vertical diaphragm unit 4 are also fully welded and fixed inside it. The arch rib tube 11 is welded to the steel structure box unit 1 on the construction site.

[0048] On the other hand, before the steel structure box unit 1 is lowered using a crane, the fixed steel pipe 2 has already maintained a stable vertical state due to the full curing effect of the foundation a. However, at this time, only the lower part of the fixed steel pipe 2 is filled with concrete, and the height of the concrete inside is the height of the upper surface of the foundation.

[0049] Therefore, the upper concrete section inside the fixed steel pipe 2, the concrete block 13 inside the arch seat, and the concrete section 12 inside the pipe need to be continuously added and poured together to obtain the required amount of concrete. However, if the upper concrete section inside the fixed steel pipe 2 is obtained by the concrete overflowing inwards from the concrete block 13 inside the arch seat and occasionally falling in, the filling time will be long and prone to problems.

[0050] The first batch of concrete has already begun to solidify, but the amount of concrete in this batch is relatively small, and the solidified shape does not completely fill the gaps in the fixed steel pipe 2. Then, the concrete that is poured in later is unable to fill the gaps in the solidified shape, which ultimately results in large hollow sections inside the fixed steel pipe 2.

[0051] The hollow structure will ultimately reduce the strength of the fixed steel pipe 2, the connection structure between the steel structure box unit 1 and the pier a, as well as the strength of the steel structure box unit 1 itself, which needs to be avoided.

[0052] Therefore, ultimately, a portion of the arch rib tube 11 is inserted into the steel structure box unit 1, allowing for a relatively large, rapid, and concentrated spraying of concrete to fully fill the fixed steel pipe 2. Only then does the concrete gradually accumulate to form the concrete block 13 within the arch seat. The purpose of this specific structure and concrete addition method is to prevent hollow sections from appearing in the fixed steel pipe 2.

[0053] The steel structure box unit 1 includes a base plate 101, a first lower vertical plate 102, a lower inclined plate 103, a first upper vertical plate 104, an upper inclined plate 105 and a top plate 106 arranged sequentially from bottom to top on the base plate 101, and two closed web plates 107 arranged on the base plate 101.

[0054] In this embodiment, the steel structure box unit 1 is an all-steel structure. All gaps between the 12 plates are fully welded to ensure that the concrete structure is fully contained and protected inside the steel structure, because the steel structure is less prone to weathering and peeling compared to the concrete structure.

[0055] Of the 12 plates mentioned above, only 2 of the closed web plates 107 are composite shapes, while the rest are rectangular. The specific shapes of the closed web plates 107, from top to bottom, are: a smaller trapezoid, a smaller rectangle, a larger trapezoid, and a larger rectangle.

[0056] The steel structure box unit 1 also includes a fixing hole 108 on the base plate 101 for inserting the fixing steel pipe 2, an installation hole 109 on the lower inclined plate 103 for inserting the arch rib pipe 11 and for adding concrete into the fixing steel pipe 2, and a connecting hole 110 on the upper inclined plate 105 for pouring the concrete block 13 in the arch seat.

[0057] In this embodiment, each steel structure box unit 1 corresponds to 4 rows of arch rib tubes 11, so a row of openings needs to be made on each of the 2 lower inclined plates 103 and the 2 upper inclined plates 105.

[0058] In addition, the connecting rod 6 is in the shape of a "cross" or "X" and is made of integrally welded steel rod. It can be used to weld the two upper and lower arch rib tubes 11 on the same side together, which can improve the overall integrity of the arch seat structure.

[0059] Of these, the lower two rows of arch rib tubes 11 require concrete to be added into the fixed steel pipe 2 first and specifically, while the upper two rows of arch rib tubes 11 do not. Therefore, the size of the mounting hole 109 is larger than the connecting hole 110; the former must be able to pass through the arch rib tube 11, while the latter only needs to be able to add falling concrete slurry.

[0060] Finally, the fixing hole 108 is inserted into the fixing steel pipe 2, which is already fixed in place, to ensure that the lowering position of the steel structure box unit 1 is the preset position.

[0061] The steel structure box unit 1 also includes a pouring hole 111 provided on the top plate 106.

[0062] In this embodiment, if all the concrete required for the arch seat were added only at the arch rib tube 11, it might take a long time. Therefore, by opening the pouring hole 111, the time required for adding concrete is further shortened, provided that the fixed steel pipe 2 is also fully filled with concrete.

[0063] On the other hand, an opening for adding concrete can be made on the arch rib tube 11, and a filling steel plate can be welded on later. Alternatively, concrete can be added directly to the exposed end of the relatively short arch rib tube 11, and the subsequent complete arch rib steel tube structure can be obtained by fitting a new, arc-shaped steel tube onto the arch rib tube 11.

[0064] The transverse partition unit 3 includes a lower transverse plate 301 disposed on two first lower vertical plates 102, an upper transverse plate 302 disposed on two first upper vertical plates 104, a reinforcing hole 303 disposed on the lower transverse plate 301 for inserting the fixed steel pipe 2, and a concrete drop hole 304 disposed on the lower transverse plate 301 and the upper transverse plate 302.

[0065] In this embodiment, both the horizontal partition unit 3 and the vertical partition unit 4 are made of steel plates, and their functions are largely the same, mainly including the following two:

[0066] First, support the "empty shell" of the steel structure box unit 1 to prevent it from bending and deforming outwards or inwards;

[0067] Secondly, the concrete block 13 inside the arch seat acts as a shear key, so that the "shell" and the concrete block not only contain each other, but are fully combined to bear the tensile and compressive forces in all directions.

[0068] The reinforcing hole 303 is vertically aligned with the fixing hole 108 to reinforce the connection between the steel structure box unit 1 and the fixing steel pipe 2.

[0069] Furthermore, all four sides of the lower horizontal plate 301 and the upper horizontal plate 302 are welded. Therefore, without the concrete drop hole 304, concrete cannot be obtained inside the steel structure box unit 1 below the upper horizontal plate 302. This is the purpose of the concrete drop hole 304.

[0070] The vertical partition unit 4 includes a second lower vertical plate 401 disposed on the bottom plate 101 and the lower horizontal plate 301, a middle vertical plate 402 disposed on the lower horizontal plate 301 and the upper horizontal plate 302, and a second upper vertical plate 403 disposed on the upper horizontal plate 302 and the top plate 106.

[0071] In this embodiment, the second lower vertical plate 401, the middle vertical plate 402, and the second upper vertical plate 403 are all rectangular in shape, but their length and width dimensions need to be set as needed to ensure sufficient vertical support.

[0072] Specifically, there are 2 upper vertical plates 403, 4 middle vertical plates 402, and 6-10 lower vertical plates 401.

[0073] Finally, the left and right vertical edges of the above three types of vertical plates cannot be welded and sealed; a gap must be left between them and the two closed web plates 107 to allow concrete to pass through. In other words, the width of the above three types of vertical plates is smaller than the width of the above upper and lower horizontal plates.

[0074] The vertical partition unit 4 further includes a positioning vertical plate 404 disposed on the upper surface of the lower horizontal plate 301 and used to block the insertion end of the arch rib tube 11, and a limiting vertical hole plate 405 disposed on the upper surface of the lower horizontal plate 301 and used to fit the arch rib tube 11.

[0075] In this embodiment, the positioning vertical plate 404 is the endpoint indicator position of the insertion action of the arch rib tube 11, and the opening on the limiting vertical hole plate 405 is aligned with the mounting hole 109, ultimately ensuring that the inner opening of the lower arch rib tube 11 is as close as possible to the upper opening of the fixed steel pipe 2.

[0076] This structural relationship ensures that the fixed steel pipe 2 is fully filled with concrete, resulting in greater structural strength.

[0077] The positioning vertical plate 404 is rectangular in shape, and the limiting vertical perforated plate 405 is either a rectangular plate with oblique holes or a two-section bent plate with straight holes in the upper part, the latter as shown in the attached figure. Figure 4 As shown.

[0078] The lower horizontal plate 301, upper horizontal plate 302, second lower vertical plate 401, middle vertical plate 402, second upper vertical plate 403, positioning vertical plate 404, and limiting vertical perforated plate 405 are all provided with stiffening ribs 5.

[0079] In this embodiment, the stiffening rib 5 is used to strengthen the stability of the horizontal and vertical plate structures, upgrading the "plate structure" to a "frame structure", thus making the horizontal and vertical plates more difficult to bend and deform.

[0080] The stiffening ribs 5 can be arranged horizontally, vertically, or diagonally, and they also function as shear keys within the concrete block 13 inside the arch seat.

[0081] A construction method for a steel-concrete composite arch abutment structure includes the following steps in sequence.

[0082] S1. Positioning of fixed steel pipe: Before the foundation a is cured, the fixed steel pipe 2 is vertically inserted and at least 1 / 3 of its length is exposed. Then, the vertical angle of the fixed steel pipe 2 is reinforced until the foundation a is cured.

[0083] S2. Positioning of steel structure box unit: The steel structure box unit 1 is sleeved on the fixed steel pipe 2 until the steel structure box unit 1 is pressed on the upper surface of the support a.

[0084] S3. Install the arch rib tube: Install and fix the arch rib tube 11 on the steel structure box unit 1;

[0085] S4. Pouring concrete: Adding concrete into the arch rib tube 11 so that the fixed steel pipe 2, the steel structure box unit 1 and the arch rib tube 11 are successively filled with concrete.

[0086] S5. Concrete vibration compaction and curing: The concrete is first vibrated and compacted in the arch rib tube 11 and / or steel structure box unit 1, and then cured to finally obtain the steel-concrete composite arch seat structure.

[0087] In this embodiment, after the fixed steel pipe 2 has been fully filled with concrete, the lower arch rib pipe 11 that was originally inserted can also be pulled out appropriately. At this time, the opening on the limiting vertical hole plate 405 can form a concrete shear key, which can also reinforce the concrete and the vertical partition plate unit 4.

[0088] S4. During concrete pouring, concrete is also added at the steel structure box unit 1.

[0089] In this embodiment, the concrete addition at the pouring hole 111 does not pre-fill the concrete at the fixed steel pipe 2, and is neither harmful nor beneficial. The pouring hole 111 is mainly used to quickly and fully fill and form the concrete block 13 inside the entire arch seat.

[0090] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of the present invention. These are non-inventive modifications and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A steel-concrete composite abutment structure comprising an arch rib tube (11), a concrete section (12) in the tube, and a concrete block (13) in the abutment, characterized in that: Further comprising a steel structure box unit (1) internally provided with the arch seat inner concrete block (13) and used for inserting the arch rib pipe (11), a fixed steel pipe (2) inserted on the steel structure box unit (1) and used for connecting the bearing platform (a), a transverse partition plate unit (3) arranged in the steel structure box unit (1) and used for sleeving the fixed steel pipe (2), and a vertical partition plate unit (4) arranged on the transverse partition plate unit (3) and used for filling the fixed steel pipe (2) with concrete by sleeving the arch rib pipe (11), The steel structure box unit (1) comprises a bottom plate (101), a first lower vertical plate (102), a lower inclined plate (103), a first upper vertical plate (104), an upper inclined plate (105) and a top plate (106) sequentially arranged on the bottom plate (101) from bottom to top, and two closed web plates (107) arranged on the bottom plate (101), The steel structure box unit (1) further comprises a fixing hole (108) arranged on the bottom plate (101) and used for inserting the fixed steel pipe (2), a mounting hole (109) arranged on the lower inclined plate (103) and used for adding concrete into the fixed steel pipe (2) by inserting the arch rib pipe (11), and a communication hole (110) arranged on the upper inclined plate (105) and used for pouring the arch seat inner concrete block (13), The transverse partition plate unit (3) comprises a lower transverse plate (301) arranged on two first lower vertical plates (102), an upper transverse plate (302) arranged on two first upper vertical plates (104), a reinforcing hole (303) arranged on the lower transverse plate (301) and used for inserting the fixed steel pipe (2), and a concrete falling hole (304) arranged on the lower transverse plate (301) and the upper transverse plate (302), The vertical partition plate unit (4) comprises a second lower vertical plate (401) arranged on the bottom plate (101) and the lower transverse plate (301), a middle vertical plate (402) arranged on the lower transverse plate (301) and the upper transverse plate (302), and a second upper vertical plate (403) arranged on the upper transverse plate (302) and the top plate (106), The vertical partition plate unit (4) further comprises a positioning vertical plate (404) arranged on the upper surface of the lower transverse plate (301) and used for blocking the insertion end of the arch rib pipe (11), and a limiting vertical hole plate (405) arranged on the upper surface of the lower transverse plate (301) and used for sleeving the arch rib pipe (11).

2. A composite steel-concrete arch structure according to claim 1, characterized in that: The steel structure box unit (1) further comprises a pouring hole (111) arranged on the top plate (106).

3. A composite steel-concrete arch support structure according to claim 1, wherein: The lower transverse plate (301), the upper transverse plate (302), the second lower vertical plate (401), the middle vertical plate (402), the second upper vertical plate (403), the positioning vertical plate (404) and the limiting vertical hole plate (405) are all provided with stiffening ribs (5).

4. A construction method of a steel-concrete composite abutment structure according to claim 1, characterized in that The method comprises the following steps in sequence, S1, fixed steel pipe positioning: before the cap (a) solidification, the vertical insertion of the fixed steel pipe (2), and expose at least 1 / 3 length of the fixed steel pipe (2), then assist to reinforce the vertical angle of the fixed steel pipe (2), until the cap (a) solidification is completed; S2, steel structure box unit positioning: the steel structure box unit (1) is sleeved on the fixed steel pipe (2), until the steel structure box unit (1) is pressed on the upper surface of the cap (a); S3, install arch rib pipe: install the fixed arch rib pipe (11) on the steel structure box unit (1); S4, pouring concrete: adding concrete into the arch rib pipe (11), so that the fixed steel pipe (2), steel structure box unit (1) and arch rib pipe (11) are filled with concrete in turn; S5, concrete vibration compaction maintenance: the concrete in the arch rib pipe (11) and / or steel structure box unit (1) is vibrated and compacted first, and then maintained, and finally the steel-concrete combined arch seat structure is obtained.

5. The construction method of a steel-concrete composite arch support structure according to claim 4, characterized in that: S4, in the pouring concrete, the steel structure box unit (1) is also added with concrete.

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