A segment joint connection structure of prefabricated UHPC box-type arch rib and its construction method

Abstract

The invention discloses a segment joint connection structure of a prefabricated UHPC box-shaped arch rib and a construction method thereof, which belongs to the technical field of building construction, and comprises a prefabricated UHPC box-shaped arch rib, a connection structure is arranged at both ends of the prefabricated UHPC box-shaped arch rib, the connection structure comprises a plurality of flange components circumferentially arranged on the inner wall of the prefabricated UHPC box-shaped arch rib, a part of the flange component is pre-buried in the prefabricated UHPC box-shaped arch rib, a part of the flange component is exposed from the inner cavity of the prefabricated UHPC box-shaped arch rib, and the flange component is used to connect with the flange component on the adjacent prefabricated UHPC box-shaped arch rib; a pre-pressing structure is arranged at both ends of the prefabricated UHPC box-shaped arch rib, the pre-pressing structure comprises a plurality of threaded steel bars circumferentially arranged on the inner wall of the prefabricated UHPC box-shaped arch rib, the threaded steel bars pass through steel casing holes reserved on two adjacent prefabricated UHPC box-shaped arch ribs and are respectively anchored on the two prefabricated UHPC box-shaped arch ribs. The invention has a simple structure, excellent interface stress, good construction performance, and can realize rapid connection of adjacent UHPC box-shaped arch ribs at the construction site.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a segment joint connection structure of a prefabricated UHPC box-type arch rib and a construction method thereof. Background Art

[0002] With the development of ultra-high performance concrete (UHPC) materials, more and more structures are gradually using UHPC materials for the main load-bearing structures. At present, the main arch ribs of UHPC arch bridges are all small-span rib arches or plate arches, which are constructed by integral prefabrication or cast-in-place support. This structure and construction method cannot achieve more economical and fast construction of large-span UHPC arch bridges. Large-span UHPC arch bridges usually use box-type arch ribs according to the load characteristics, and in order to better play the characteristics of UHPC materials, UHPC box-type arch ribs are usually prefabricated parts, and the segment joint connection of prefabricated UHPC box-type arch ribs will become a key technical factor restricting the successful construction of UHPC box-type arches.

[0003] Some prefabricated UHPC structures, such as steel-UHPC composite slab structures, are connected by casting UHPC in situ to form wet joints at the joints. However, for arch bridges with high-altitude cantilever construction, the construction convenience and quality will face severe challenges, and the stress performance of wet joints formed by post-casting is much smaller than that of prefabricated structures. For arch bridges with relatively uniform stress, the wet joint position will become a weak point in the stress of the large-span arch rib structure.

[0004] Therefore, a segment joint connection structure of prefabricated UHPC box-type arch rib and its construction method are proposed. Summary of the invention

[0005] The object of the present invention is to provide a segment joint connection structure of a prefabricated UHPC box-type arch rib and a construction method thereof, aiming to solve or improve at least one of the above-mentioned technical problems.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a segment joint connection structure of a prefabricated UHPC box-type arch rib and a construction method thereof, comprising:

[0007] Prefabricated UHPC box-shaped arch rib, wherein the prefabricated UHPC box-shaped arch rib is a hollow structure;

[0008] A connection structure, wherein the connection structure is arranged at both ends of the prefabricated UHPC box-shaped arch rib, and the connection structure comprises a plurality of flange components circumferentially arranged on the inner wall of the prefabricated UHPC box-shaped arch rib, wherein a portion of the flange component is pre-embedded in the prefabricated UHPC box-shaped arch rib, and a portion of the flange component is exposed from the inner cavity of the prefabricated UHPC box-shaped arch rib, and the flange component is used to connect with the flange component on the adjacent prefabricated UHPC box-shaped arch rib;

[0009] A pre-stressing structure is provided at both ends of the prefabricated UHPC box-shaped arch rib, and the pre-stressing structure comprises a plurality of threaded steel bars circumferentially arranged on the inner wall of the prefabricated UHPC box-shaped arch rib, and the threaded steel bars pass through steel casing holes reserved on two adjacent prefabricated UHPC box-shaped arch ribs and are respectively anchored on the two prefabricated UHPC box-shaped arch ribs.

[0010] Preferably, the prefabricated UHPC box-type arch rib includes a standard section, two partition sections and two connecting sections, the two connecting sections are respectively located at both ends of the standard section, the standard section and the connecting section are fixedly connected through the partition section, the flange member is arranged on the connecting section, and the inner cavity size of the partition section is smaller than the inner cavity size of the standard section and the connecting section.

[0011] Preferably, the flange component includes a pressure plate, a base plate and two anchor plates, the opposite sides of the base plate are fixedly connected to the pressure plate and the two anchor plates, the pressure plate and the anchor plates are respectively perpendicular to the base plate, the two anchor plates are pre-embedded in the connecting section, the base plate is close to the inner wall of the connecting section, the pressure plate is located in the inner cavity of the connecting section, a plurality of bolt holes are opened on the pressure plate, the pressure plate and the pressure plate on the connecting section of the adjacent prefabricated UHPC box-type arch rib are fixedly connected by a plurality of high-strength bolt assemblies, and the high-strength bolt assemblies pass through the two bolt holes on the two pressure plates.

[0012] Preferably, a pad is provided between two pressure-bearing plates connected to two adjacent prefabricated UHPC box-shaped arch ribs, and the pad is provided with the bolt hole for the high-strength bolt assembly to pass through.

[0013] Preferably, a plurality of shear holes are evenly distributed on the anchor plate, and an annular shear key structure made of steel bars sequentially passes through a plurality of the shear holes on the plurality of anchor plates located on the same connecting section, and the annular shear key structure is pre-buried in the connecting section.

[0014] Preferably, the outer end faces of the two connecting sections on the prefabricated UHPC box-type arch rib are air-facing surfaces, one of the air-facing surfaces is fixedly connected with a plurality of male falcons, and the other air-facing surface is provided with a plurality of female falcons, the plurality of male falcons are arranged in a one-to-one correspondence with the plurality of female falcons, and the positions and sizes of the male falcons and the female falcons match each other.

[0015] Preferably, the male falcon is in a prism shape, and the top plane of the prism at the end of the male falcon is covered with elastic rubber plates. The female falcon is a prism shape + a square structure complex with the top of the prism connected. A steel panel is embedded at the end of the square part of the female falcon. The prism-shaped part of the male falcon matches the prism-shaped part of the female falcon in size. The elastic rubber plate on the male falcon extends into the square part of the female falcon and is tightly attached to the surface of the steel panel.

[0016] Preferably, the sum of the thicknesses of the steel panel and the elastic rubber sheet is greater than the depth of the square portion of the concave portion, and the difference is not less than 1 mm.

[0017] Preferably, a plurality of U-shaped hollow short ribs are circumferentially fixed to the inner wall of the connecting section, one end of the U-shaped hollow short rib is flush with the free surface, and the other end is fixed to the partition section and passes through the partition section, the steel casing hole is opened on the U-shaped hollow short rib, a steel casing is fixed in the steel casing hole, an anchoring structure corresponding to the steel casing is fixed to the partition section, the threaded steel is passed through the steel casing and its end is fixed by the anchoring structure.

[0018] A construction method for a segment joint connection structure of a prefabricated UHPC box-type arch rib is also provided, comprising the following steps:

[0019] S1: Prefabricate multiple flange components;

[0020] S2: Casting the prefabricated UHPC box-shaped arch rib. During casting, a portion of the plurality of flange components is embedded in the prefabricated UHPC box-shaped arch rib;

[0021] S3: Fix one prefabricated UHPC box-shaped arch rib, then hoist the next prefabricated UHPC box-shaped arch rib, and apply epoxy resin glue on the connecting end surfaces of the two prefabricated UHPC box-shaped arch ribs;

[0022] S4: Connect the flange components on the connection end faces of the two prefabricated UHPC box-type arch ribs without pre-tightening the flange components; when the connection end faces are correctly positioned and docked, gradually pre-tighten the flange components until the gap at the connection interface disappears;

[0023] S5: After gradually pre-tightening the flange components to the design value, tension and anchor the threaded steel bars in the pre-stressed structure to complete the segment connection construction.

[0024] The present invention discloses the following technical effects: adjacent prefabricated UHPC box-type arch ribs are positioned and connected by circumferentially arranged flange components, and the threaded steel in the prestressing structure is prestressed so that the connection interface of the adjacent prefabricated UHPC box-type arch ribs is tightly compressed. The present invention has a simple structure, excellent interface force, and good construction performance, and can realize the rapid connection of adjacent UHPC box-type arch ribs at the construction site. The adjacent prefabricated UHPC box-type arch ribs are convenient to position during the connection construction, and no welding or pouring of concrete is required. There is no exposed steel plate outside the UHPC box-type arch ribs, and the durability is good. The external prestressing further ensures the safety of the structural force. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the UHPC box-type arch rib segment and joint of the present invention;

[0027] Figure 2 This is a sectional view of the three-dimensional structure of the UHPC box-type arch rib segment of the present invention;

[0028] Figure 3 It is a schematic diagram of the three-dimensional structure of the positive falcon surface of the UHPC box-type arch rib segment of the present invention;

[0029] Figure 4 It is a schematic diagram of the three-dimensional structure of the concave surface of the UHPC box-type arch rib segment of the present invention;

[0030] Figure 5 This is a three-dimensional structural cross-sectional view of the UHPC box-type arch rib segment joint of the present invention;

[0031] Figure 6 This is a cross-sectional view of a UHPC box-type arch rib segment joint of the present invention;

[0032] Figure 7 It is a schematic diagram of the three-dimensional structure of the flange after the UHPC box-type arch rib segment joint is spliced;

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of the UHPC box-type arch rib segment joint flange of the present invention;

[0034] Fig. 9 A three-dimensional schematic diagram of a Yang Falcon and an external elastic rubber plate in the present invention;

[0035] Fig.10 A three-dimensional schematic diagram of a Yin Falcon and an embedded steel panel in the present invention;

[0036] Fig.11 It is a schematic diagram of the three-dimensional matching of the yang falcon and the yin falcon before no pressure is applied to the UHPC box-type arch rib segment joint of the present invention.

[0037] In the figure: 1. Prefabricated UHPC box-type arch rib; 101. Standard section; 102. Partition section; 103. Connecting section; 104. Connecting section contact chamfer; 105. Yang Falcon; 106. Yin Falcon; 107. Top plate; 108. Second bottom plate; 109. Web plate; 110. Connecting section chamfer; 111. Steel casing hole; 112. Free surface; 113. Elastic rubber sheet; 114. Steel inlay plate; 115. U-shaped hollow short rib; 105-1. First Yang Falcon; 105-2. First Yang Falcon; 106-1. First Yin Falcon; 106-2. First Yin Falcon;

[0038] 2. Connection structure; 201. Flange structure; 202. Flange structure; 203. Annular shear key structure; 204. Pressure plate; 205. Transition plate; 206. Bottom plate; 207. Anchor plate; 208. High-strength bolt assembly; 209. Shear hole; 210. Bolt hole; 211. Pad; 212. Overall structure;

[0039] 3. Pre-stressing structure; 301. Casing; 302. Threaded steel bar; 303. Anchoring structure. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] Reference Figure 1-Figure 11 The present invention provides a segment joint connection structure of a prefabricated UHPC box-type arch rib and a construction method thereof, comprising:

[0043] The prefabricated UHPC box-shaped arch rib 1 is a hollow structure;

[0044] A connection structure 2, the connection structure 2 is arranged at both ends of the prefabricated UHPC box-shaped arch rib 1, and the connection structure 2 includes a plurality of flange components circumferentially arranged on the inner wall of the prefabricated UHPC box-shaped arch rib 1, a portion of the flange component is embedded in the prefabricated UHPC box-shaped arch rib 1, and a portion is exposed from the inner cavity of the prefabricated UHPC box-shaped arch rib 1, and the flange component is used to connect with the flange component on the adjacent prefabricated UHPC box-shaped arch rib 1;

[0045] The prestressing structure 3 is arranged at both ends of the prefabricated UHPC box-type arch rib 1. The prestressing structure 3 includes a plurality of threaded steel bars 302 circumferentially arranged on the inner wall of the prefabricated UHPC box-type arch rib 1. The threaded steel bars 302 pass through the steel casing holes 111 reserved on two adjacent prefabricated UHPC box-type arch ribs 1 and are anchored on the two prefabricated UHPC box-type arch ribs 1 respectively.

[0046] In this embodiment, the flange component includes a first flange structure 201 and a second flange structure 202. The first flange structure 201 and the second flange structure 202 have the same structure but different layout directions. The first flange structure 201 is horizontally or vertically distributed, and the second flange structure 202 is obliquely distributed.

[0047] In some optional embodiments, the prefabricated UHPC box-type arch rib 1 includes a standard section 101, two partition sections 102 and two connecting sections 103, the two connecting sections 103 are respectively located at both ends of the standard section 101, the standard section 101 and the connecting section 103 are fixedly connected by the partition section 102, the flange component is arranged on the connecting section 103, and the inner cavity size of the partition section 102 is smaller than the inner cavity size of the standard section 101 and the connecting section 103.

[0048] In this embodiment, the standard section 101, the two partition sections 102 and the two connecting sections 103 are all hollow structures, which are convenient for people to enter and exit, and reduce the deadweight of the structure; the inner cavity size of the partition section 102 is smaller than the inner cavity size of the standard section 101 and the connecting section 103, and the outer dimensions of the standard section 101, the two partition sections 102 and the two connecting sections 103 are the same. The inner cavity of the partition section 102 is connected to the inner wall of the standard section 101 and the connecting section 103 through the connecting section contact chamfer 104. The connecting section contact chamfer 104 has a size of 20cm×20cm, and is distributed with steel casing holes 111 with a diameter of 11cm, so that the steel casing 301 can pass through. The thickness of the partition section 102 is 15cm, which can meet the force requirements of the preload structure 3 through calculation.

[0049] In some optional embodiments, the flange component includes a pressure plate 204, a bottom plate 206 and two anchor plates 207, the opposite sides of the bottom plate 206 are fixedly connected to the pressure plate 204 and the two anchor plates 207, the pressure plate 204 and the anchor plates 207 are respectively perpendicular to the bottom plate 206, the two anchor plates 207 are pre-buried in the connecting section 103, the bottom plate 206 is close to the inner wall of the connecting section 103, the pressure plate 204 is located in the inner cavity of the connecting section 103, a plurality of bolt holes 210 are opened on the pressure plate 204, the pressure plate 204 is fixedly connected to the pressure plate 204 on the connecting section 103 of the adjacent prefabricated UHPC box-type arch rib 1 through a plurality of high-strength bolt assemblies 208, and the high-strength bolt assemblies 208 pass through the two bolt holes 210 on the two pressure plates 204.

[0050] In some optional embodiments, a backing plate 211 is provided between two pressure-bearing plates 204 connected to two adjacent prefabricated UHPC box-type arch ribs 1 , and a bolt hole 210 for the high-strength bolt assembly 208 to pass through is opened on the backing plate 211 .

[0051] In this embodiment, the connecting section 103 includes a top plate 107, a second bottom plate 108 and a web plate 109, and the plate thickness is 30 cm, which is equal to the corresponding plate thickness of the standard section 101, and four connecting section chamfers 110 are arranged at the intersection of the top plate 107, the second bottom plate 108 and the web plate 109. The size of the connecting section chamfer 110 is 30 cm × 10 cm, which can meet the layout requirements of the first flange structure 201, the second flange structure 202, the male falcon 105 or the female falcon 106.

[0052] The top plate 107 is provided with a first flange structure 201 which is arranged transversely, the web plate 109 is provided with a first flange structure 201 which is arranged vertically, and the chamfer 110 of the connecting section is provided with a second flange structure 202 which is arranged obliquely.

[0053] In this embodiment, the upper part of the bottom plate 206 is welded vertically to the pressure plate 204 and the transition plate 205, and the lower part is welded to the anchor plate 207 along the length direction of the long side connecting section 103. Two anchor plates 207 are provided, and shear holes 209 are evenly distributed on them, and the hole diameter is 14mm. The pad 211 is arranged between two adjacent pressure plates 204, and the pad 211 and the pressure plate 204 are provided with corresponding bolt holes 210. The M24 high-strength bolt assembly 208 passes through the bolt holes 210 and is anchored on the pressure plate 204.

[0054] In some optional embodiments, multiple shear holes 209 are evenly distributed on the anchor plate 207, and the annular shear key structure 203 made of steel bars passes through several shear holes 209 on multiple anchor plates 207 located on the same connecting section 103 in sequence, and the annular shear key structure 203 is pre-buried in the connecting section 103.

[0055] In some optional embodiments, the outer end surfaces of the two connecting sections 103 on the prefabricated UHPC box-type arch rib 1 are free-facing surfaces 112, one of the free-facing surfaces 112 is fixedly connected with a plurality of male falcons 105, and the other free-facing surface 112 is provided with a plurality of female falcons 106, the plurality of male falcons 105 and the plurality of female falcons 106 are arranged in a one-to-one correspondence, and the positions and sizes of the male falcons 105 and the female falcons 106 match each other.

[0056] In some optional embodiments, the male falcon 105 is in a prism shape, and the top plane of the prism at the end of the male falcon 105 is covered with elastic rubber plates 113. The female falcon 106 is a prism shape + prism top connected to a square structure complex. A steel panel 114 is embedded at the end of the square part of the female falcon 106. The sizes of the prism-shaped part of the male falcon 105 and the prism-shaped part of the female falcon 106 match each other. The elastic rubber plate 113 on the male falcon 105 extends into the square part of the female falcon 106 and is tightly attached to the surface of the steel panel 114.

[0057] In this embodiment, the convex 105 includes a first convex 105-1 and a second convex 105-2, which have the same structure but are arranged in different directions. The concave 106 includes a first concave 106-1 and a second concave 106-2, which have the same structure but are arranged in different directions. The first convex 105-1 and the first concave 106-1 are respectively arranged horizontally or vertically on the top plate 107, the second bottom plate 108 and the web 109 of the free surface 112; the second convex 105-2 and the second concave 106-2 are respectively arranged obliquely on the chamfer 110 of the connecting section. The net spacing between adjacent first convex 105-1 or first concave 106-1 on the same free surface 112 is 45 cm, which can meet the arrangement requirements of the first flange structure 201. A single convex 105 or concave 106 is 15 cm wide and 30 cm long. Considering the thinness of the UHPC box girder, the long side direction of the first convex 105-1 and the first concave 106-1 is perpendicular to the thickness direction of the top plate 107, the second bottom plate 108 and the web 109, and the long side direction of the second convex 105-2 and the second concave 106-2 is parallel to the length direction of the hypotenuse of the chamfer 110 of the connecting section. The first convex 105-1 and the first concave 106-1 are located on the center line of the corresponding plate of the connecting section 103, two are symmetrically distributed on the top plate 107 and the second bottom plate 108, three are symmetrically distributed on the web 109, and one of the second convex 105-2 and the second concave 106-2 is distributed on each of the chamfers 110 of the four connecting sections. The densely distributed arrangement of the male and female falcons 105 and 106 can increase the shear strength of the connection interface and increase the uniformity of the force on the connection interface, while ensuring the tightness and firmness of the connection interface.

[0058] In some optional embodiments, the sum of the thicknesses of the steel panel 114 and the elastic rubber plate 113 is greater than the depth of the square portion of the yin 106, and the difference is not less than 1 mm.

[0059] In this embodiment, the sum of the thickness of the steel panel 114 and the elastic rubber sheet 113 is greater than the depth of the square portion of the yin 106 by 3 mm. After the initial docking, the connection interface cannot form a close fit due to this 3 mm difference, and pressure must be applied to the connection interface to achieve contact of the entire connection interface. This structure can eliminate the uneven stress on the connection interface caused by the construction errors of the yang 105 and the yin 106, and can also serve as a basis for judging whether the connection interface begins to be evenly compressed.

[0060] In some optional embodiments, a plurality of U-shaped hollow short ribs 115 are circumferentially fixed to the inner wall of the connecting section 103, one end of the U-shaped hollow short rib 115 is flush with the free surface 112, and the other end is fixed to the partition section 102 and passes through the partition section 102, a steel casing hole 111 is opened on the U-shaped hollow short rib 115, a steel casing 301 is fixed in the steel casing hole 111, an anchoring structure 303 corresponding to the steel casing 301 is fixed to the partition section 102, the threaded steel bar 302 is passed through the steel casing 301 and its end is fixed by the anchoring structure 303.

[0061] In this embodiment, a U-shaped hollow short rib 115 is provided on the inner wall of the connecting section 103, which corresponds to the position of each first male screw 105-1 and the first female screw 106-1. The U-shaped hollow short rib 115 is 50 cm long, one end of which starts from the free surface 112 and the other end is connected to the partition section 102. A steel casing hole 111 with a diameter of 11 cm is provided on the cross section of the U-shaped hollow short rib 115, and the maximum width of the cross section of the U-shaped hollow short rib 115 is the same as the length of the male screw 105 or the female screw 106, which is 30 cm, and the height is 20 cm. The setting of the U-shaped hollow short rib 115 not only seals and protects the fine-rolled threaded steel 302, but also increases the area and rigidity of the connection interface and reduces the stress level of the connection interface.

[0062] In this embodiment, multiple first flange structures 201 are distributed on the inner cavity side of the connection section 103, specifically arranged in the middle of adjacent U-shaped hollow short ribs 115 of the same section and close to the inner cavity side, and the second flange structure 202 is arranged in the middle of the chamfer 110 of the connection section on the free surface of the connection section 103 and on the inner cavity side, in the same direction as the second female flange 106-2 or the second male flange 105-2, so that the flange bottom plate 206 is close to the inner wall of the connection section 103. The annular shear key structure 203 of the steel bar with a nominal diameter of 12 mm is used to sequentially pass through the shear holes 209 of the multiple first flange structures 201 and the second flange structures 202, and the multiple first flange structures 201 and the second flange structures 202 of the same section are connected into a whole 212, so as to increase the connection between the flange structure and the connection section 103, and facilitate the precise positioning and pre-embedded construction of multiple flange structures.

[0063] In this embodiment, the length of the pressure plate 204 is 35 cm, which is less than the 45 cm clear distance between the adjacent first male 105-1 or first female 106-1, and the clear distance from the free surface 112 of the connecting section 103 is 5 mm, and the thickness of the pad 211 is 10 mm. The anchor plate 207 and the annular shear key structure 203 are all pre-buried in the connecting section 103, the pre-buried depth is 12 cm, and the clear distance between the anchor plate 207 and the free surface 112 of the connecting section 103 is 3 cm, which prevents the anchor plate 207 from leaking out at the connecting interface.

[0064] In this embodiment, the rebar 302 is arranged inside the U-shaped hollow short rib 115, passes through the steel casing hole 111 on the U-shaped hollow short rib 115, passes through the partition section 102 with the free surface 112 as the symmetry plane, and is anchored on the contact chamfer 104 of the connecting section. The number of the fine-rolled rebar 302 is the same as that of the first concave rib 106-1 or the first convex rib 105-1, and the effective tensioning length of the fine-rolled rebar 302 is 1.3m.

[0065] A construction method for a segment joint connection structure of a prefabricated UHPC box-type arch rib is also provided, comprising the following steps:

[0066] S1: Prefabricate multiple flange components;

[0067] S2: Casting the prefabricated UHPC box-shaped arch rib 1. During the casting, a portion of the plurality of flange components is embedded in the prefabricated UHPC box-shaped arch rib 1;

[0068] S3: Fix one prefabricated UHPC box-shaped arch rib 1, then hoist the next prefabricated UHPC box-shaped arch rib 1, and apply epoxy resin glue on the connecting end surfaces of the two prefabricated UHPC box-shaped arch ribs 1;

[0069] S4: Connect the flange components on the connection end surfaces of the two prefabricated UHPC box-shaped arch ribs 1, and the flange components are not pre-tightened; when the connection end surfaces are correctly positioned and docked, gradually pre-tighten the flange components until the gap at the connection interface disappears;

[0070] S5: After gradually pre-tightening the flange components to the design value, the threaded steel bar 302 in the pre-stressing structure 3 is tensioned and anchored to complete the segment connection construction.

[0071] The detailed construction steps are:

[0072] S1: Prefabricate a plurality of first flange structures 201 and second flange structures 202, and distribute them according to the free surface 112 at the connecting section 103, and connect them into an integral structure 212 using an annular shear key structure 203;

[0073] S2: Casting the prefabricated UHPC box-shaped arch rib 1 to form structures such as the inner rib 106, the outer rib 105 and the hollow short rib 115, and embedding the overall structure 212 in the prefabricated UHPC box-shaped arch rib 1;

[0074] S3: Use epoxy resin to stick the elastic rubber plate 113 on the end of the Yang Falcon 105, and use epoxy resin to stick the steel panel 114 on the bottom of the Yin Falcon 106;

[0075] S4: Fix a prefabricated UHPC box-shaped arch rib 1 so that the section with the yin falcon 106 is the free surface 112, hoist the next prefabricated UHPC box-shaped arch rib 1 so that the free surface 112 with the yang falcon 105 faces the yin falcon 106 of the previous section, and apply epoxy resin glue on the two free surfaces 112 respectively;

[0076] S5: Connect the second flange structure 202 on the upper segment Yin Falcon 106 and the next segment Yang Falcon 105. The second flange structure 202 is not pre-tightened. After the connection interface is correctly positioned and docked, a small gap will appear on the connection interface because the elastic rubber plate 113 has not been compressed. Then connect the first flange structure 201, and gradually pre-tighten the first flange structure 201 and the second flange structure 202 until the gap on the connection interface disappears, thereby achieving full-section close contact on the connection interface.

[0077] S6: gradually pre-tighten the first flange structure 201 and the second flange structure 202 to the design value; then tension and anchor all the pre-stressed structures 3, thus completing the segment connection construction.

[0078] The densely distributed yin-yang, yang-yang, hollow short rib structures and flange structures improve the stress on the connection interface. At the same time, the prestressed anchors are set on the partitions to further ensure the tight fit of the connection interface. The flange structure is set at the four chamfers of the prefabricated UHPC box-type arch ribs, which makes positioning convenient during construction, and there is no need for welding or pouring concrete throughout the process. There is no exposed steel plate outside the UHPC box-type arch ribs, and the durability is good. The joint connection structure is quick and convenient to construct, and can easily achieve high-altitude precise positioning. There is no need for on-site welding and cast-in-place construction. Multiple structural measures are used to ensure the reliability of the stress performance at the joint, while also having strong durability.

[0079] 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.

[0080] The embodiments described above are only descriptions of the preferred modes 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 all fall within the protection scope determined by the claims of the present invention.

Claims

1. A segment joint connection structure of a prefabricated UHPC box-type arch rib, characterized in that: include: A prefabricated UHPC box-shaped arch rib (1), wherein the prefabricated UHPC box-shaped arch rib (1) is a hollow structure; A connection structure (2) is arranged at both ends of the prefabricated UHPC box-shaped arch rib (1), the connection structure (2) comprising a plurality of flange components circumferentially arranged on the inner wall of the prefabricated UHPC box-shaped arch rib (1), a portion of the flange component being pre-buried in the prefabricated UHPC box-shaped arch rib (1), and a portion being exposed from the inner cavity of the prefabricated UHPC box-shaped arch rib (1), the flange component being used to connect with the flange component on the adjacent prefabricated UHPC box-shaped arch rib (1); A pre-stressing structure (3) is arranged at both ends of the prefabricated UHPC box-shaped arch rib (1), the pre-stressing structure (3) comprising a plurality of threaded steel bars (302) circumferentially arranged on the inner wall of the prefabricated UHPC box-shaped arch rib (1), the threaded steel bars (302) passing through steel casing holes (111) reserved on two adjacent prefabricated UHPC box-shaped arch ribs (1) and being anchored respectively on the two prefabricated UHPC box-shaped arch ribs (1).

2. The segment joint connection structure of the prefabricated UHPC box-type arch rib according to claim 1, characterized in that: The prefabricated UHPC box-type arch rib (1) comprises a standard section (101), two partition sections (102) and two connecting sections (103); the two connecting sections (103) are respectively located at two ends of the standard section (101); the standard section (101) and the connecting section (103) are fixedly connected via the partition section (102); the flange component is arranged on the connecting section (103); and the inner cavity size of the partition section (102) is smaller than the inner cavity size of the standard section (101) and the connecting section (103).

3. The segment joint connection structure of the prefabricated UHPC box-type arch rib according to claim 2, characterized in that: The flange component comprises a pressure-bearing plate (204), a bottom plate (206) and two anchor plates (207); opposite sides of the bottom plate (206) are fixedly connected to the pressure-bearing plate (204) and the two anchor plates (207); the pressure-bearing plate (204) and the anchor plates (207) are respectively perpendicular to the bottom plate (206); the two anchor plates (207) are pre-buried in the connecting section (103); and the bottom plate (206) is closely attached to the inner wall of the connecting section (103). The pressure-bearing plate (204) is located in the inner cavity of the connecting section (103), and a plurality of bolt holes (210) are provided on the pressure-bearing plate (204). The pressure-bearing plate (204) is fixedly connected to the pressure-bearing plate (204) on the connecting section (103) of the adjacent prefabricated UHPC box-type arch rib (1) through a plurality of high-strength bolt assemblies (208), and the high-strength bolt assemblies (208) penetrate through the two bolt holes (210) on the two pressure-bearing plates (204).

4. The segment joint connection structure of the prefabricated UHPC box-type arch rib according to claim 3, characterized in that: A pad (211) is provided between two pressure-bearing plates (204) connected to two adjacent prefabricated UHPC box-shaped arch ribs (1), and the pad (211) is provided with the bolt hole (210) for the high-strength bolt assembly (208) to pass through.

5. The segment joint connection structure of the prefabricated UHPC box-type arch rib according to claim 3, characterized in that: A plurality of shear holes (209) are evenly distributed on the anchor plate (207), and an annular shear key structure (203) made of steel bars sequentially passes through a plurality of the shear holes (209) on the plurality of anchor plates (207) located on the same connection section (103), and the annular shear key structure (203) is pre-buried in the connection section (103).

6. The segment joint connection structure of the prefabricated UHPC box-type arch rib according to claim 3, characterized in that: The outer end surfaces of the two connecting sections (103) on the prefabricated UHPC box-shaped arch rib (1) are free-facing surfaces (112), one of the free-facing surfaces (112) is fixedly connected with a plurality of male grommets (105), and the other free-facing surface (112) is provided with a plurality of female grommets (106), the plurality of male grommets (105) and the plurality of female grommets (106) are arranged in a one-to-one correspondence, and the positions and sizes of the male grommets (105) and the female grommets (106) match each other.

7. The segment joint connection structure of the prefabricated UHPC box-type arch rib according to claim 6, characterized in that: The male falcon (105) is in the shape of a prism, and the top plane of the prism at the end of the male falcon (105) is covered with an elastic rubber plate (113). The female falcon (106) is a prism-shaped + prism-top connected square structure complex. The square part of the female falcon (106) is embedded with a steel panel (114) at the end. The prism-shaped part of the male falcon (105) and the prism-shaped part of the female falcon (106) match each other in size. The elastic rubber plate (113) on the male falcon (105) extends into the square part of the female falcon (106) and is tightly attached to the surface of the steel panel (114).

8. The segment joint connection structure of the prefabricated UHPC box-type arch rib according to claim 7, characterized in that: The sum of the thicknesses of the steel panel (114) and the elastic rubber plate (113) is greater than the depth of the square portion of the concave convex portion (106), and the difference is not less than 1 mm.

9. The segment joint connection structure of the prefabricated UHPC box-type arch rib according to claim 6, characterized in that: A plurality of U-shaped hollow short ribs (115) are fixedly connected to the inner wall of the connecting section (103) in the circumferential direction; one end of the U-shaped hollow short rib (115) is flush with the free surface (112); the other end is fixedly connected to the partition section (102) and passes through the partition section (102); the steel casing hole (111) is opened on the U-shaped hollow short rib (115); a steel casing (301) is fixedly connected in the steel casing hole (111); an anchoring structure (303) corresponding to the steel casing (301) is fixedly connected to the partition section (102); the threaded steel (302) is passed through the steel casing (301) and its end is fixedly connected via the anchoring structure (303).

10. A construction method for a segment joint connection structure of a prefabricated UHPC box-type arch rib, according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Prefabricate multiple flange components; S2: Casting the prefabricated UHPC box-shaped arch rib (1), during casting, embedding a portion of the plurality of flange components in the prefabricated UHPC box-shaped arch rib (1); S3: Fix one prefabricated UHPC box-shaped arch rib (1), then hoist the next prefabricated UHPC box-shaped arch rib (1), and apply epoxy resin glue on the connecting end surfaces of the two prefabricated UHPC box-shaped arch ribs (1); S4: connecting the flange components on the connection end faces of the two prefabricated UHPC box-shaped arch ribs (1) without pre-tightening the flange components; when the connection end faces are correctly positioned and butted, gradually pre-tightening the flange components until the gap at the connection interface disappears; S5: After gradually pre-tightening the flange components to the design value, the threaded steel bars (302) in the pre-stressing structure (3) are tensioned and anchored to complete the segment connection construction.

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