Arch rib encased concrete construction device and method for steel tube stiff skeleton arch bridge

Abstract

The invention belongs to the technical field of arch rib construction, and particularly relates to an arch rib encased concrete construction device and method for a steel tube stiff skeleton arch bridge. Flanges are arranged at the two ends of the conveying pipe; the conveying pipe comprises an outer pipe and an inner pipe; an annular cavity is formed between the outer pipe and the inner pipe; a group of guide holes are uniformly distributed in positions, corresponding to the annular cavity, on the surface of the flange; a conveying channel and an annular channel are formed in the supporting base. The conveying pipe is designed to be of a double-layer structure of the outer pipe and the inner pipe, concrete is conveyed through the inner pipe and the conveying channel, water flow used for temperature control is pumped into the annular cavities from the two banks of the arch bridge, the water flow flows along the annular cavities and the interior of the annular channel and exchanges heat with the concrete in the inner pipe in the period, and the conveying temperature of the concrete is controlled; according to the device, the conveying pipe and the supporting seat are assembled section by section according to different section construction progresses of the encased concrete, the technical difficulty is low, and the temperature control effect is more ideal.

Description

Technical Field

[0001] This invention belongs to the field of arch rib construction technology, specifically to the construction device and method for encasing the arch ribs of steel pipe rigid frame arch bridges in concrete. Background Technology

[0002] The steel pipe rigid frame arch bridge is a composite arch bridge with a steel pipe truss as its core load-bearing structure. Its core process involves first forming hollow steel pipe truss arch ribs through segmented hoisting and welding; then, pouring micro-expansion concrete inside the steel pipes to form a rigid frame; and finally, pouring an outer layer of concrete to form a complete arch ring. This structure fully leverages the combined advantages of the tensile strength of steel and the compressive strength of concrete, possessing three major characteristics: high strength and lightweight, convenient construction, and strong adaptability to large spans. It is particularly suitable for bridge construction in complex terrains such as canyons and deep water.

[0003] In existing technologies for constructing concrete cladding around arch ribs, temperature control is required for the concrete delivery pipelines to maintain stable concrete rheological properties and ensure pumping quality and structural durability. Specifically, high-temperature environments accelerate cement hydration, leading to a sharp drop in slump and an increase in viscosity, increasing the risk of pipe blockage and exacerbating plastic shrinkage cracking. Low-temperature environments cause a surge in concrete viscosity, potentially causing pipe bursts due to excessive pump pressure, and uncontrolled air content affects frost resistance. For high-temperature environments, external surface spraying is typically used for cooling, while for low-temperature environments, electric heating is usually employed. However, arch rib construction involves large-span, long-distance concrete delivery, making it extremely difficult to install spraying or heating devices along the delivery pipeline, and the temperature control effect is often insufficient to meet actual construction requirements.

[0004] Therefore, the present invention provides a construction device and method for encasing the arch ribs of a steel pipe rigid frame arch bridge in concrete. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: the concrete encasing device for the arch rib of the steel pipe stiffened frame arch bridge described in the present invention includes a conveying pipe and a support base;

[0007] The conveying pipe is provided with flanges at both ends; the conveying pipe includes an outer pipe and an inner pipe; an annular cavity is formed between the outer pipe and the inner pipe; a set of guide holes are evenly distributed on the surface of the flange at the corresponding positions of the annular cavity.

[0008] The support base is fixedly connected to the surface of the arch rib frame; the support base is used to fix and support the conveying pipe; the flange is fixedly connected to the support base by bolts; the support base has a conveying channel and an annular channel inside; the conveying channel and the annular channel are aligned with and connected to the inner pipe and the annular cavity, respectively.

[0009] Preferably, both the annular cavity and the annular channel include an upper half and a lower half, and the upper half and the lower half are isolated from each other; a connecting hole is provided between the upper half and the lower half of the annular cavity, and the connecting hole is located at one end of the conveying pipe.

[0010] The annular cavity has sealing rings inside both ends; a set of springs is fixedly connected between the sealing rings and the flange; and a set of guide rods is fixedly connected to the support base at the corresponding position of the guide hole.

[0011] Preferably, a through hole is provided between the flange surface and the connection hole; a sealing rod is fixedly connected to the support at the position corresponding to the through hole.

[0012] Preferably, a central column is rotatably connected inside the support base; a handwheel is fixedly connected to the top of the central column; and a protruding ring is fixedly connected to the bottom of the central column at a position corresponding to the annular track.

[0013] A water inlet is provided between the bottom of the conveying channel and the ring channel; a sealing ball is provided inside the water inlet; a bracket is fixedly connected to the inside of the ring channel below the water inlet; a spring is fixedly connected between the bracket and the sealing ball; and a steel wire rope is fixedly connected between the convex ring and the sealing ball.

[0014] Preferably, a sealing disc is fixedly connected to the central column at the corresponding position of the conveyor.

[0015] Preferably, a water-stop pad is provided between the flange and the support base; a water-stop ring is fixedly connected to the outside of the sealing plate.

[0016] Preferably, a set of movable plates and elastic pads are evenly distributed on the inner and outer surfaces of the inner tube; the ends of the movable plates are connected to the inner tube via hinges and torsion springs; an elastic hollow block is fixedly connected between the movable plates and the inner tube; an elastic element is fixedly connected between the elastic pad and the inner tube; a closed space is formed between the elastic pad and the inner tube, and the closed space is connected to the hollow block via an air tube.

[0017] Preferably, a wire mesh is fixedly connected between the movable plate and the inner tube; the wire mesh and the movable plate wrap around the hollow block.

[0018] A method for constructing concrete encasing the arch ribs of a steel-tube rigid frame arch bridge, employing the aforementioned concrete encasing construction device for the arch ribs of a steel-tube rigid frame arch bridge, includes the following steps:

[0019] A1. Divide the completed steel arch rib frame into several segments along its arc direction;

[0020] A2. Construction proceeds from both sides towards the middle, with formwork installed on the outside of the steel arch rib frame and concrete poured into the formwork to achieve segmented encapsulation until closure.

[0021] The specific construction steps for pouring concrete in section A2 are as follows:

[0022] B1. Assemble the conveying pipe and support according to the construction section location, and use the support to fix the conveying pipe to the steel arch rib frame.

[0023] B2. Concrete is transported through the inner pipe and conveying channel using concrete pumping equipment and poured into the formwork. Water is circulated through the annular cavity and annular channel using water pumping equipment, and the water temperature is controlled in real time.

[0024] B3. As the water flows through the various delivery pipes and support bases, it can exchange heat with the concrete, thus controlling the concrete delivery temperature within an ideal range.

[0025] B4. If a blockage occurs in the concrete delivery pipe during construction, immediately stop pumping concrete and locate the blockage.

[0026] B5. Rotate the handwheel of the first support seat upstream of the blockage point to drive the central column and the convex ring to rotate 90°. Then the sealing ball will open the water inlet and the sealing disc will close the delivery channel.

[0027] B6. Water in the lower part of the ring road enters the conveying channel and inner pipe through the water inlet. As the water volume and water pressure continue to increase, it dilutes, impacts, and presses against the concrete at the blockage point to clear the blockage.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. The steel pipe rigid frame arch bridge arch rib external concrete construction device and method of the present invention, by designing the conveying pipe as a double-layer structure of outer pipe and inner pipe, the concrete is conveyed through the inner pipe and the conveying channel, while the annular cavity between the outer pipe and the inner pipe and the annular channel of the support seat are used to convey water. Water for temperature control is pumped from both sides of the arch bridge into the annular cavity, so that it flows along the annular cavity and the annular channel, and exchanges heat with the concrete in the inner pipe during the process, so as to achieve temperature control of the conveyed concrete. This device assembles the conveying pipe and support seat segment by segment according to the different construction progress of the external concrete, which has low technical difficulty and more ideal temperature control effect.

[0030] 2. The concrete encasing device and method for the arch ribs of a steel pipe rigid frame arch bridge as described in this invention divides the annular cavity and annular channel into an upper and lower half. When pumping water, water enters the annular cavity from the lower half. The water then flows continuously through the lower half of the annular cavity and annular channel, as well as the guide hole, through each delivery pipe and support. Since the end of the annular cavity of the last delivery pipe is blocked, the water continues to flow upward through the connection hole into the upper half of the annular cavity. Then, it flows in the opposite direction through the upper half of the annular cavity and annular channel, as well as the guide hole, through each delivery pipe and support, and finally returns to the original pumping position. This achieves dynamic circulation of temperature-controlled water, which saves water resources, facilitates the control of water temperature and pressure, and improves the temperature control effect on concrete.

[0031] 3. The concrete encasing device and method for the arch rib of the steel pipe rigid frame arch bridge described in this invention, if a blockage occurs in the concrete pipeline during construction, the concrete pumping is immediately stopped, the blockage location is determined, and then the handwheel of the first support seat upstream of the blockage location is rotated, driving the central column and the convex ring to rotate 90° to loosen the wire rope. At this time, the second spring can push the sealing ball upward, causing the water inlet to be in a conductive state. Then, the water in the lower half of the ring channel can enter the conveying channel and the inner pipe through the water inlet, using the water flow to dilute and impact the concrete blockage location to alleviate the blockage and achieve rapid unblocking of the concrete pipeline. Attached Figure Description

[0032] The invention will now be further described with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the structure of the steel arch rib frame with concrete encasing it in one segment during construction in this invention;

[0034] Figure 2 This is a schematic diagram of the conveying pipe and support base in this invention;

[0035] Figure 3 This is a cross-sectional view of the conveying pipe and support base in this invention;

[0036] Figure 4 yes Figure 3 Enlarged view of a portion of point A in the middle;

[0037] Figure 5 yes Figure 3 Enlarged view of a section at point B in the middle;

[0038] Figure 6 yes Figure 3 Sectional view at CC;

[0039] Figure 7 yes Figure 6 Enlarged view of a section at point D;

[0040] Figure 8 This is a schematic diagram of the connection between the conveying pipe and the support base in this invention;

[0041] Figure 9 This is a schematic diagram of the flange structure in this invention;

[0042] Figure 10 yes Figure 9 Enlarged view of a section at point E in the middle;

[0043] Figure 11 and Figure 12 This is a schematic diagram of the method flow of the present invention.

[0044] In the diagram: 1. Conveying pipe 101, outer pipe 102, inner pipe 102, support base 2, flange 3, annular cavity 4, guide hole 5, conveying channel 6, annular channel 7, connecting hole 8, sealing ring 9, spring one 10, guide rod 11, through hole 12, sealing rod 13, center column 14, handwheel 15, convex ring 16, water inlet 17, sealing ball 18, bracket 19, spring two 20, steel wire rope 21, sealing disc 22, water-stop pad 23, water-stop ring 24, movable piece 25, elastic pad 26, hollow block 27, elastic element 28, air pipe 29, steel wire mesh 30. Detailed Implementation

[0045] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0046] like Figures 1 to 10 As shown, the concrete-encased arch rib construction device for the steel pipe rigid frame arch bridge of the present invention includes a conveying pipe 1 and a support base 2.

[0047] The conveying pipe 1 is provided with flanges 3 at both ends; the conveying pipe 1 includes an outer pipe 101 and an inner pipe 102; an annular cavity 4 is formed between the outer pipe 101 and the inner pipe 102; a set of guide holes 5 are evenly distributed on the surface of the flange 3 at the corresponding positions of the annular cavity 4.

[0048] The support base 2 is fixedly connected to the surface of the arch rib skeleton; the support base 2 is used to fix and support the conveying pipe 1; the flange 3 is fixedly connected to the support base 2 by bolts; the support base 2 has a conveying channel 6 and an annular channel 7 inside; the conveying channel 6 and the annular channel 7 are aligned with and connected to the inner pipe 102 and the annular cavity 4, respectively.

[0049] In the current technology for concrete construction of arch rib skeleton, in order to maintain the stability of concrete rheological properties and ensure the quality of pumping construction and structural durability, the temperature of the pipeline used to transport concrete needs to be controlled. For high-temperature environments, external surface spraying is usually used for cooling, and for low-temperature environments, electric heating is usually used. However, arch rib construction involves large-span and long-distance concrete transportation, and it is extremely difficult to arrange spraying or heating devices along the transportation pipeline. Moreover, the temperature control effect is not ideal and it is difficult to meet the actual construction needs.

[0050] In this invention, during construction, delivery pipes 1 and support seats 2 are added segment by segment according to the construction progress. The support seats 2 are used to fix delivery pipes 1 to the arch rib frame, so as to transport concrete from both sides of the arch bridge to the interior of the formwork to be poured, thus realizing segmented construction. By designing delivery pipe 1 as a double-layer structure of outer pipe 101 and inner pipe 102, concrete is transported through inner pipe 102 and delivery channel 6, while the annular cavity 4 between outer pipe 101 and inner pipe 102 and the annular channel 7 of support seat 2 are used to transport water. Water for temperature control is pumped from both sides of the arch bridge into the annular cavity 4, so that it flows along each The flow inside the annular cavity 4 and the annular channel 7 exchanges heat with the concrete in the inner pipe 102 to achieve temperature control of the concrete during delivery. This device assembles the delivery pipe 1 and support seat 2 segment by segment according to the different construction progress of the outer concrete. The technical difficulty is relatively low and the temperature control effect is more ideal. For high temperature environment, the water used for heat exchange should be low temperature water to cool down the concrete. For low temperature environment, the water used for heat exchange should be high temperature water to heat the concrete. The actual water temperature is dynamically adjusted according to the ambient temperature to keep the concrete temperature as close as possible to 5-30℃.

[0051] In another embodiment of the present invention, both the annular cavity 4 and the annular channel 7 include an upper half and a lower half, and the upper half and the lower half are isolated from each other; a connecting hole 8 is provided between the upper half and the lower half of the annular cavity 4, and the connecting hole 8 is located at one end of the conveying pipe 1.

[0052] The annular cavity 4 has sealing rings 9 inside both ends; a set of springs 10 are fixedly connected between the sealing rings 9 and the flange 3; a set of guide rods 11 are fixedly connected to the support base 2 at the corresponding position of the guide hole 5.

[0053] Under normal circumstances, the sealing ring 9 is pressed against the surface of the flange 3 by the action of the spring 10 to seal the guide hole 5. When the conveying pipe 1 is in an unassembled state, it can prevent external dust and other debris from entering the annular cavity 4 through the guide hole 5 and causing blockage. When the conveying pipe 1 and the support seat 2 are assembled segment by segment, the guide rod 11 of the support seat 2 is aligned and inserted into the guide hole 5 and pushes the sealing ring 9 open, so that the guide hole 5 is in a conductive state, so as to connect the annular cavity 4 with the annular channel 7. However, the tail end of the last conveying pipe 1 of the entire pipeline is not connected to the support seat 2, so its sealing ring 9 is still in a closed state of the guide hole 5.

[0054] By dividing the annular cavity 4 and the annular channel 7 into upper and lower halves, water is allowed to enter the annular cavity 4 from the lower half during pumping. The water then flows continuously through the lower half of the annular cavity 4 and the annular channel 7, as well as the guide hole 5, through each delivery pipe 1 and the support seat 2. Since the end of the annular cavity 4 of the last delivery pipe 1 is blocked, the water will continue to flow upward through the connecting hole 8 into the upper half of the annular cavity 4. Then, it flows in the opposite direction through the upper half of the annular cavity 4 and the annular channel 7, as well as the guide hole 5, through each delivery pipe 1 and the support seat 2, and finally returns to the original pumping position of the water flow. This achieves dynamic circulation of temperature-controlled water, which can save water resources, facilitate the control of water temperature and pressure, and improve the temperature control effect on concrete.

[0055] A through hole 12 is provided between the surface of the flange 3 and the connection hole 8; a sealing rod 13 is fixedly connected to the support base 2 at the position corresponding to the through hole 12.

[0056] When the delivery pipe 1 is connected to the support base 2, the sealing rod 13 is inserted into the through hole 12 to seal the connection hole 8. Therefore, all the connection holes 8 of the delivery pipe 1 except the end are blocked. The end of the delivery pipe 1 is not connected to the support base 2, so its connection hole 8 is not blocked by the sealing rod 13 and is in the open state. The through hole 12 at this end is blocked by an external object. When the water is delivered, the water flows downstream and exchanges heat along the lower half of the annular cavity 4 and the annular channel 7 until it flows to the end of the last delivery pipe 1. Then it enters the upper half through the connection hole 8 at this end and returns to the pumping point through the upper half. This structure allows the temperature-controlled water to achieve a complete flow circulation in the pipeline, instead of being diverted and dispersed through multiple connection holes 8, so as to ensure that the flow rate, velocity and pressure at each position of the pipeline are balanced, and fully improve the temperature control uniformity of the concrete.

[0057] In another embodiment of the present invention, a central column 14 is rotatably connected inside the support base 2; a handwheel 15 is fixedly connected to the top of the central column 14; and a protruding ring 16 is fixedly connected to the bottom of the central column 14 at the corresponding position of the annular track 7.

[0058] A water inlet 17 is provided between the bottom of the conveying channel 6 and the annular channel 7; a sealing ball 18 is provided inside the water inlet 17; a bracket 19 is fixedly connected to the annular channel 7 below the water inlet 17; a second spring 20 is fixedly connected between the bracket 19 and the sealing ball 18; a steel wire rope 21 is fixedly connected between the convex ring 16 and the sealing ball 18; the steel wire rope 21 passes through the inside of the second spring 20 and the lower side of the bracket 19, and a guide wheel is provided at the bend of the steel wire rope 21.

[0059] Under normal circumstances, the convex ring 16 tightens the steel wire rope 21, causing the sealing ball 18 to seal the water inlet 17, thus isolating the concrete from the water. If a blockage occurs in the concrete pipeline during construction, the concrete pumping is stopped immediately, the blockage location is identified, and then the handwheel 15 of the first support seat 2 upstream of the blockage location is rotated, causing the central column 14 and the convex ring 16 to rotate 90° to loosen the steel wire rope 21. At this time, the spring 20 can push the sealing ball 18 upward, causing the water inlet 17 to be in a conductive state. Then, the water in the lower half of the ring channel 7 can enter the conveying channel 6 and the inner pipe 102 through the water inlet 17, using the water flow to dilute and impact the concrete blockage to alleviate the blockage and achieve rapid unblocking of the concrete pipeline. In case of non-essential circumstances, it is not necessary to disassemble the pipeline.

[0060] It is worth noting that when determining the location of a blockage, it is necessary to combine personnel's experience with analysis. One method is to tap the pipe to make a sound; the blockage point is where the sound is unusually dull.

[0061] The central column 14 is fixedly connected to a sealing disc 22 at a corresponding position in the conveying channel 6. When the central column 14 is rotated, the sealing disc 22 is rotated synchronously. On the one hand, the sealing ball 18 opens the water inlet 17, and on the other hand, the sealing disc 22 closes the conveying channel 6. At this time, the water flowing into the inner pipe 102 can only flow downstream to the blocked part, and cannot flow upstream through the sealing disc 22. As the amount of water entering between the blocked point and the sealing disc 22 gradually increases, the water pressure continues to rise, which can increase the pressure of the water on the concrete at the blocked point, thereby further improving the dredging efficiency of the blocked part. After dredging, the water flow carries the blocked concrete out through the downstream end of the pipeline, and the water flow can also flush the inside of the inner pipe 102.

[0062] In another embodiment of the present invention, a water-stop pad 23 is provided between the flange 3 and the support base 2; a water-stop ring 24 is fixedly connected to the outside of the sealing plate 22.

[0063] In another embodiment of the present invention, a set of movable plates 25 and elastic pads 26 are evenly distributed on the inner wall and outer wall surface of the inner tube 102, respectively; the end of the movable plate 25 is connected to the inner tube 102 by a hinge and a torsion spring; an elastic hollow block 27 is fixedly connected between the movable plate 25 and the inner tube 102; an elastic element 28 is fixedly connected between the elastic pad 26 and the inner tube 102; a closed space is formed between the elastic pad 26 and the inner tube 102, and the closed space is connected to the hollow block 27 by an air pipe 29.

[0064] During the process of conveying concrete in the inner tube 102, the movable plate 25 can frequently deflect towards the inner wall of the inner tube 102 under the squeezing action of the concrete aggregate. In turn, the movable plate 25 squeezes the hollow block 27 and compresses the air stored in it into the closed space between the elastic pad 26 and the inner tube 102 through the air pipe 29. This causes the elastic pad 26 to expand and deform, and to bulge into the annular cavity 4 to agitate the water flow, giving the water flow a radial flow pattern, improving the turbulence effect of the temperature-controlled water, and further promoting the full heat exchange between the water flow and the concrete.

[0065] A wire mesh 30 is fixedly connected between the movable plate 25 and the inner tube 102; the wire mesh 30 and the movable plate 25 wrap around the hollow block 27. Through the joint wrapping of the hollow block 27 by the wire mesh 30 and the movable plate 25, the wire mesh 30 can intercept the aggregate in the concrete, preventing the aggregate from directly rubbing against the hollow block 27, which would cause it to wear or even crack and leak air, thus extending the service life of the hollow block 27.

[0066] like Figures 11 to 12 As shown, the present invention describes a method for constructing concrete encasing the arch ribs of a steel-pipe stiffened arch bridge. This method utilizes the aforementioned concrete encasing construction device for the arch ribs of a steel-pipe stiffened arch bridge and includes the following steps:

[0067] A1. Divide the completed steel arch rib frame into several segments along its arc direction;

[0068] A2. Construction proceeds from both sides towards the middle, with formwork installed on the outside of the steel arch rib frame and concrete poured into the formwork to achieve segmented encapsulation until closure.

[0069] The specific construction steps for pouring concrete in section A2 are as follows:

[0070] B1. Assemble the conveying pipe 1 and the support seat 2 according to the construction section location, and use the support seat 2 to fix the conveying pipe 1 to the steel arch rib frame.

[0071] B2. Concrete is transported through the inner pipe 102 and the conveying channel 6 using concrete pumping equipment and poured into the formwork. Water is circulated through the annular cavity 4 and the annular channel 7 using water pumping equipment, and the water temperature is controlled in real time.

[0072] B3. As the water flows through each conveying pipe 1 and support 2, it can exchange heat with the concrete, thus controlling the conveying temperature of the concrete within an ideal range.

[0073] B4. If a blockage occurs at any point in the concrete delivery pipe 1 during construction, immediately stop pumping concrete and determine the location of the blockage.

[0074] B5. Rotate the handwheel 15 of the first support seat 2 upstream of the blockage, which will drive the central column 14 and the convex ring 16 to rotate 90°. Then the sealing ball 18 will open the water inlet 17 and the sealing disc 22 will close the conveying channel 6.

[0075] B6. Water in the lower half of the ring road 7 enters the conveying channel 6 and the inner pipe 102 through the water inlet 17. As the water volume and water pressure continue to increase, the concrete at the blockage is diluted, impacted, and pressurized to clear the blockage.

[0076] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0077] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0078] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction device for encasing the arch ribs of a steel pipe rigid frame arch bridge in concrete, characterized in that: It comprises a conveying pipe (1) and a support base (2); The conveying pipe (1) is provided with flanges (3) at both ends; the conveying pipe (1) comprises an outer pipe (101) and an inner pipe (102); an annular cavity (4) is formed between the outer pipe (101) and the inner pipe (102); a group of guide holes (5) are uniformly distributed on the surface of the flanges (3) at the corresponding positions of the annular cavity (4); The support base (2) is fixedly connected to the surface of the arch rib framework; the support base (2) is used for fixing and supporting the conveying pipe (1); the flanges (3) and the support base (2) are fixedly connected through bolts; the support base (2) is internally provided with a conveying channel (6) and an annular channel (7); the conveying channel (6) and the annular channel (7) are respectively aligned with and communicated with the inner pipe (102) and the annular cavity (4).

2. The construction device for the arch rib concrete-encased steel tubular arch bridge according to claim 1, characterized in that: The annular cavity (4) and the annular channel (7) each comprise an upper half and a lower half, and the upper half and the lower half are isolated from each other; a connecting hole (8) is arranged between the upper half and the lower half of the annular cavity (4), and the connecting hole (8) is located at one end of the conveying pipe (1); Sealing rings (9) are arranged inside the annular cavity (4) at both ends; a group of springs (10) are fixedly connected between the sealing rings (9) and the flanges (3); a group of guide rods (11) are fixedly connected to the support base (2) at the corresponding positions of the guide holes (5).

3. The device for constructing the concrete-encased arch rib of a steel tubular rigid frame arch bridge according to claim 2, characterized in that: Through holes (12) are arranged between the surface of the flanges (3) and the connecting holes (8); a sealing rod (13) is fixedly connected to the support base (2) at the corresponding position of the through hole (12).

4. The device for constructing the concrete-encased arch rib of a steel tubular rigid frame arch bridge according to claim 3, characterized in that: A central column (14) is rotatably connected inside the support base (2); a hand wheel (15) is fixedly connected to the top of the central column (14); a convex ring (16) is fixedly connected to the bottom of the central column (14) at the corresponding position of the annular channel (7); A water filling port (17) is arranged between the conveying channel (6) and the bottom of the annular channel (7); a sealing ball (18) is arranged inside the water filling port (17); a support (19) is fixedly connected to the annular channel (7) at a position below the water filling port (17); a spring (20) is fixedly connected between the support (19) and the sealing ball (18); a steel wire rope (21) is fixedly connected between the convex ring (16) and the sealing ball (18).

5. The device for constructing the concrete-encased arch rib of a steel tubular rigid frame arch bridge according to claim 4, characterized in that: The central column (14) is fixedly connected with a sealing disc (22) at the corresponding position of the conveying channel (6).

6. The construction device for the arch rib concrete-encased steel tubular arch bridge according to claim 5, characterized in that: A water stop pad (23) is arranged between the flanges (3) and the support base (2); a water stop ring (24) is fixedly connected to the outside of the sealing disc (22).

7. The construction device for the concrete-encased arch rib of a steel tubular rigid frame arch bridge according to claim 6, characterized in that: A group of movable pieces (25) and elastic pads (26) are uniformly distributed on the inner wall and the outer wall of the inner pipe (102); the movable pieces (25) are connected to the inner pipe (102) through hinges and torsional springs at the ends; a hollow elastic block (27) is fixedly connected between the movable pieces (25) and the inner pipe (102); an elastic member (28) is fixedly connected between the elastic pads (26) and the inner pipe (102); a closed space is formed between the elastic pads (26) and the inner pipe (102), and the closed space is communicated with the hollow elastic block (27) through an air pipe (29).

8. The device for constructing the concrete-encased arch rib of a steel tubular rigid frame arch bridge according to claim 7, characterized in that: The steel wire mesh (30) is fixedly connected between the movable piece (25) and the inner tube (102); the steel wire mesh (30) and the movable piece (25) are wrapped around the hollow block (27).

9. The construction method of the arch rib concrete-encased steel tube arch bridge, which adopts the construction device of the arch rib concrete-encased steel tube arch bridge according to claim 8, characterized in that: The method comprises the following steps: A1, the steel arch rib skeleton which has been constructed is divided into several segments along the arc direction thereof; A2, the formwork is installed outside the steel arch rib skeleton, and the concrete is poured into the formwork, so that the segments are wrapped outside one by one until the closure is realized; The specific construction steps of pouring the concrete in A2 are as follows: B1, the delivery pipe (1) and the support seat (2) are assembled according to the construction segment position, and the delivery pipe (1) is fixedly connected with the steel arch rib skeleton by the support seat (2); B2, the concrete is delivered and poured into the formwork through the inner tube (102) and the delivery channel (6) by using the concrete pumping equipment, the water flow is circulated and delivered through the annular cavity (4) and the annular channel (7) by using the water pumping equipment, and the water temperature is controlled in real time; B3, the water flow can exchange heat with the concrete in the process of passing through each delivery pipe (1) and support seat (2), so that the delivery temperature of the concrete is controlled in the ideal range.

10. The construction method of the arch rib concrete-encased steel tubular arch bridge according to claim 9, characterized in that: The pouring of the concrete in A2 further comprises the following specific construction steps: B4, if the concrete delivery pipe (1) is blocked at some position during the construction process, the pumping of the concrete is immediately stopped, and the blocked position is determined; B5, the hand wheel (15) of the first support seat (2) upstream of the blocked position is rotated, the central column (14) and the convex ring (16) are rotated by 90°, the pouring opening (17) is opened by the blocking ball (18), and the delivery channel (6) is closed by the blocking disc (22); B6, the water in the lower half of the annular channel (7) enters the delivery channel (6) and the inner tube (102) through the pouring opening (17), and as the water quantity and water pressure continue to rise, the concrete at the blocked position is diluted, impacted and pressed, so that the blocked position is dredged.

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