Fabricated detachable composite beam bridge and construction method thereof

Abstract

The invention relates to a fabricated detachable composite beam bridge and a construction method thereof, and belongs to the technical field of bridge construction. The beam bridge comprises steel beams arranged in the transverse bridge direction and UHPC prefabricated bridge decks. The ends of the longitudinal connecting pieces of the steel beams are located in the reserved pouring areas of the UHPC prefabricated bridge deck slabs. A plurality of reserved holes in the transverse bridge direction are formed in the UHPC prefabricated bridge deck slab, and tensioning rod pieces are arranged in the reserved holes; the tensioning rod pieces are connected with the adjacent UHPC prefabricated bridge deck slabs, and the ends of the tensioning rod pieces are located in the reserved pouring areas. The butt joint face of the contact position between every two adjacent UHPC prefabricated bridge deck slabs is of a tongue-and-groove structure, the contact position is covered with a prefabricated cover plate, and the lower surface of the prefabricated cover plate and the upper surface of the contact position are of tooth-shaped structures which are meshed with each other. Through the arrangement, the integrity and rigidity of the two UHPC prefabricated bridge deck slabs are improved. And the reserved pouring area for wet operation is located above the steel beam, and potential safety hazards caused by a large amount of wet operation at the suspended position are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to an assembled detachable composite beam bridge and a construction method thereof. Background Art

[0002] Steel-concrete composite structures can give full play to the mechanical properties of both steel and concrete, and have a reasonable force form, and are widely used in the field of bridges. The thickness of the ordinary concrete bridge deck in the traditional steel-concrete composite beam is relatively large. The thick ordinary concrete bridge deck (average thickness is about 28cm) leads to the overall weight of the structure, of which the weight of the ordinary concrete bridge deck can account for more than 70% of the total weight of the composite beam, which ultimately limits the economical span range of the composite beam bridge. Ultra-High Performance Concrete (UHPC) with added steel fiber has a compressive strength of more than 150MPa. It is a cement-based composite material with ultra-high toughness and ultra-long durability. Its application in steel-concrete composite structures can increase the span range and reduce the weight.

[0003] In existing steel-concrete structures, bolt welding is often used for connection. However, this method cannot remove the connecting parts after construction, which brings great inconvenience to subsequent maintenance, replacement or disassembly. In addition, in bridge construction, in order to ensure the stability and durability of prefabricated bridges, engineers usually reserve concrete casting strips between prefabricated components, and use wet operations to fill the reserved casting strips at the construction site. However, due to the presence of wet joints, subsequent maintenance and disassembly often require the destruction of the overall structure, which increases the difficulty and cost of disassembly and reduces the overall performance of the bridge structure after maintenance. In addition, wet operations require a lot of time and manpower, and there are safety hazards. At the same time, they involve the consumption of a large amount of cement, water and other materials. Waste will also be generated during the construction process, causing a lot of pollution to the environment. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an assembled detachable composite beam bridge and a construction method thereof, which adopts a tongue-and-groove structure instead of a wet joint, and at the same time uses a toothed limit cover plate and connecting rods to enhance the connection strength of adjacent prefabricated components, thereby reducing on-site wet work and reducing the impact of replacing the bridge deck on the bridge structure.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, an assembled detachable composite beam bridge comprises steel beams and UHPC prefabricated bridge decks arranged in a transverse direction of the bridge; vertical longitudinal connectors are installed on the steel beams, and ends of the longitudinal connectors are located in a reserved casting area of ​​the UHPC prefabricated bridge deck, and the reserved casting area comprises a plurality of reserved cavities that penetrate vertically;

[0007] The UHPC prefabricated bridge deck is provided with a plurality of reserved holes in the transverse direction of the bridge, and tension rods are provided in the reserved holes. The tension rods connect adjacent UHPC prefabricated bridge decks, and the ends of the tension rods are located in the reserved cavities;

[0008] The butt joint surface of the contact position between adjacent UHPC prefabricated bridge panels is a tongue-and-groove structure, the contact position is covered with a prefabricated cover plate, the upper surface of the contact position is provided with a lower toothed structure arranged along the longitudinal direction of the bridge, and the lower surface of the prefabricated cover plate is provided with an upper toothed structure that meshes with the lower toothed structure.

[0009] Optionally, the steel beam is provided with a horizontally upward mounting panel, the mounting panel is in contact with the bottom surface of the UHPC prefabricated bridge deck, and the longitudinal connecting member passes through the mounting panel of the steel beam.

[0010] Optionally, UHPC material is poured in the reserved pouring area, and UHPC material is filled in the reserved holes, and the strength grade of the UHPC material filled in the pouring area is not lower than the strength grade of the UHPC material used for the prefabricated bridge deck.

[0011] Optionally, a single UHPC prefabricated bridge deck is supported by a plurality of steel beams, and stiffening ribs are provided on the lower surface of the UHPC prefabricated bridge deck between adjacent steel beams, wherein the length direction of the stiffening ribs is the longitudinal direction of the bridge, and the length thereof is the same as the length of the UHPC prefabricated bridge deck along the longitudinal direction of the bridge.

[0012] Optionally, the lower toothed structure is lower than the upper surface of the UHPC prefabricated bridge deck, and the upper surface of the prefabricated cover plate is flush with the upper surface of the UHPC prefabricated bridge deck.

[0013] Optionally, the lower toothed structure is inclined at a set angle along the longitudinal bridge direction, and the inclination direction of the upper toothed structure is opposite to that of the lower toothed structure.

[0014] Optionally, the lower tooth structure includes a strip-shaped tooth root located on the upper surface of the contact position, the upper surface of the strip-shaped tooth root is straight and vertically connected to the docking surface, and the strip-shaped tooth root extends the tooth structure in a direction away from the docking surface.

[0015] Optionally, the tongue-and-groove structure at the contact position is located below the reserved hole, and the lower tooth-shaped structure is located above the reserved hole.

[0016] Optionally, epoxy resin glue is filled between the butt joint surfaces of the tongue and groove structure and between the upper toothed structure and the lower toothed structure.

[0017] In a second aspect, a construction method of an assembled detachable composite beam bridge comprises the following steps:

[0018] S1. Set the steel beam at the construction location, and erect two adjacent UHPC prefabricated bridge decks on the steel beam so that the ends of the longitudinal connectors are located in the reserved cavity of the reserved casting area;

[0019] S2, press the side of the UHPC precast bridge deck to make the two UHPC precast bridge decks tightly connected, install tension rods in the reserved holes of the UHPC precast bridge deck, and after prestressing the tension rods, fill the reserved holes with UHPC materials, and install anchors at the ends of the tension rods located in the reserved casting area;

[0020] S3, pouring UHPC material in the reserved pouring area;

[0021] S4. Apply epoxy resin glue to the lower tooth structure and the upper tooth structure, and install the prefabricated cover plate above the contact position.

[0022] Optionally, during disassembly, the longitudinal connector is pulled out from under the installation panel, and the UHPC material filled in the reserved casting area is cleaned.

[0023] The beneficial effects of the present invention are:

[0024] The present invention fixedly connects two adjacent UHPC prefabricated bridge panels through a limiting structure at the contact position: the vertical direction is limited by a tongue-and-groove structure, and the longitudinal and transverse directions are connected by the meshing relationship between the lower square tooth structure and the upper tooth structure, which greatly increases the integrity and rigidity of the bridge. By reserving holes in the horizontal direction of adjacent UHPC panels and connecting the two UHPC prefabricated bridge panels into a whole by using tension rods, the strength and durability of the connection are further improved, and the integrity and rigidity of the two UHPC prefabricated bridge panels are increased. In addition, the suspended contact position below does not require wet operations such as pouring, and the reserved pouring area that requires wet operations is located above the steel beam, avoiding various problems such as safety hazards caused by a large amount of wet operations in the suspended position.

[0025] 2. The connection part of the present invention is made into a protruding rib shape, which improves the stress form of the UHPC prefabricated bridge deck, so that the bridge can better bear the load when subjected to bending moment. The assembly installation method is used to combine and connect various modules, which can effectively adjust the internal stress of different parts in the sleeve structure, and can improve the load-bearing capacity of the composite material manipulator in specific application scenarios by prestressing.

[0026] 3. The present invention uses multiple cover plates to connect with the UHPC prefabricated bridge deck, and each part can be prefabricated to achieve an assembled and modular design, which reduces the difficulty of on-site construction. At the same time, the integrity of the two UHPC prefabricated bridge decks can be reduced by simply disassembling the cover plates, without destroying the overall structure, and the operation can be conveniently and quickly performed during maintenance, replacement or disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 It is a structural schematic diagram of the assembled detachable composite beam bridge in Example 1 of the present invention.

[0029] Figure 2 It is a structural schematic diagram of the contact position of adjacent UHPC prefabricated bridge decks in Example 1 of the present invention.

[0030] Figure 3 It is a schematic diagram of the structure of the steel beam and the longitudinal connecting member in Example 1 of the present invention.

[0031] Figure 4 It is a schematic structural diagram of the tension rod in Example 1 of the present invention.

[0032] Figure 5 It is a schematic structural diagram of the prefabricated cover plate in Example 1 of the present invention.

[0033] Figure 6 It is a schematic diagram of the installation of the prefabricated cover plate in the transverse direction of the bridge in Example 1 of the present invention.

[0034] Figure 7 It is a schematic diagram of the installation of the prefabricated cover plate in the longitudinal bridge direction in Example 1 of the present invention.

[0035] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0036] Among them, 1. UHPC precast bridge deck; 11. Reserved casting area; 12. Stiffening ribs; 13. Reserved holes; 2. Steel beams; 3. Precast cover plates; 31. Upper toothed structure; 32. Cover plate mortise; 33. Strip area; 4. Contact position; 41. Tongue and groove structure; 411. Tenon; 412. Mortise; 42. Panel mortise; 43. Lower toothed structure; 44. Strip tooth root; 51. Pad; 52. Nut; 53. Tension rod; 61. Longitudinal connector; 62. Nut. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] Example 1

[0040] An assembled detachable composite beam bridge, such as Figure 1 As shown, it includes: a plurality of steel beams 2 and a plurality of UHPC prefabricated bridge decks 1 arranged along the transverse direction of the bridge; each UHPC prefabricated bridge deck 1 is supported by two steel beams 2, and the contact position of adjacent UHPC prefabricated bridge decks 1 is located between adjacent steel beams 2, as shown in FIG. Figure 3 As shown, a vertical longitudinal connector 61 is installed on the steel beam 2, and the end of the longitudinal connector 61 is located in the reserved casting area 11 of the UHPC prefabricated bridge deck. The reserved casting area 11 includes a plurality of reserved cavities that pass through from top to bottom. The reserved cavities are shown in the figure as squares arranged along the longitudinal bridge direction;

[0041] like Figure 2 As shown, the UHPC prefabricated bridge deck 1 is provided with a plurality of reserved holes 13 in the transverse direction of the bridge, and the reserved holes 13 are provided with Figure 1 The tension rod 53 shown in the figure connects the adjacent UHPC prefabricated bridge decks 1, and the end of the tension rod 53 is located in the reserved cavity;

[0042] The butt joint surface at the contact position 4 between adjacent UHPC prefabricated bridge decks 1 is a tongue-and-groove structure 41, such as Figure 2 As shown, the upper surface of the contact position 4 is provided with lower tooth structures 43 arranged along the longitudinal bridge direction, as shown in FIG. Figure 1 As shown, the contact position 4 is covered with a prefabricated cover plate 3, as shown in FIG. Figure 5 As shown, the lower surface of the prefabricated cover plate 3 is provided with an upper toothed structure 31 , and the lower toothed structure 43 is meshed with the upper toothed structure 31 .

[0043] Through the above arrangement, the limiting structure on the contact position 4 fixes two adjacent UHPC precast bridge decks 1, and the two UHPC precast bridge decks 1 are connected as a whole through the tension rod 53 so as to be coordinated to bear force, thereby increasing the integrity and rigidity of the two UHPC precast bridge decks 1. In addition, the contact position 4 suspended below does not require wet operations such as pouring, and the reserved pouring area 11 that requires wet operations is located above the steel beam 2, thereby avoiding various problems such as safety hazards caused by a large amount of wet operations at the suspended position.

[0044] like Figure 1 As shown, the steel beam 2 is an H-shaped steel, the web of which is perpendicular to the bridge deck and extends along the longitudinal direction of the bridge; Figure 3 As shown, the upper wing plate of the H-shaped steel is a horizontal upward mounting panel, and the mounting panel is used to contact the bottom surface of the UHPC prefabricated bridge deck 1; the longitudinal connector 61 is a high-strength bolt shear member, which passes through the mounting panel of the steel beam 2, can be inserted and installed from the bottom of the mounting panel, and is fixed by the nut 62 above the mounting panel. The lower surface of the upper wing plate of the H-shaped steel is also fixed with the nut 62.

[0045] The material of the prefabricated cover plate 3 is the same as that of the UHPC prefabricated bridge deck 1, and multiple prefabricated cover plates 3 are arranged along the longitudinal direction of the bridge, which is convenient for installation and disassembly, and prevents the prefabricated cover plates 3 from breaking due to changes in the height of the longitudinal direction of the bridge.

[0046] The reserved casting area 11 is arranged above the steel beam 2 along the longitudinal direction of the bridge, and the upper surface of the UHPC prefabricated bridge deck 1 is recessed downward to form a plurality of vertically connected squares, and the bolt shear members (i.e., the ends of the longitudinal connectors) at the lower steel beam are exposed in the through-connected squares, and then the connection between the bridge deck and the steel beam is strengthened by casting UHPC material in the through-connected squares.

[0047] The through squares are used for casting UHPC materials. The strength grade of the UHPC materials used in the reserved casting area 11 is greater than or equal to the strength grade of the prefabricated bridge deck UHPC to ensure the connection strength between adjacent UHPC prefabricated bridge decks 1.

[0048] On the lower surface of the UHPC precast bridge deck 1, stiffening ribs 12 are arranged between adjacent steel beams 2. The length direction of the stiffening ribs 12 is the longitudinal direction of the bridge. The stiffening ribs 12 and the UHPC precast bridge deck 1 are an integrally formed structure. The length of the stiffening ribs 12 is the same as the length of the UHPC precast bridge deck 1 along the longitudinal direction of the bridge, and is used to improve the overall stiffness of the precast UHPC precast bridge deck 1 in the middle of the span.

[0049] like Figure 2 As shown, the lower toothed structure 43 is lower than the upper surface of the UHPC precast bridge deck 1, so that after the precast cover plate 3 is covered and installed, the upper surface of the precast cover plate 3 is flush with the upper surface of the UHPC precast bridge deck 1, forming a flat bridge deck.

[0050] like Figure 1 As shown, a plurality of reserved holes 13 in the transverse direction of the bridge are provided in the UHPC prefabricated bridge deck 1, and the tension rods 53 are located in the reserved holes 13. In this embodiment, the tension rods 53 are selected as finely rolled threaded steel bars, and the diameter of the finely rolled threaded steel bars is slightly smaller than the reserved holes. The ends of the finely rolled threaded steel bars are located in the reserved casting area 11, and as shown in FIG. Figure 4 As shown, a pad 51 is fixed at the end and equipped with a nut 52, which is used to fix the precision-rolled threaded steel bar inside the UHPC prefabricated bridge deck 1 in a state of maintaining tension to form a unified whole.

[0051] like Figure 7 As shown, the lower toothed structure 43 is inclined at a set angle along the longitudinal direction of the bridge, and the inclination direction of the upper toothed structure is opposite to that of the lower toothed structure so that the two can fit tightly together to form an integral bridge deck.

[0052] like Figure 2 As shown, the lower tooth structure 43 includes a strip-shaped tooth root 44 located on the upper surface of the contact position, and the upper surface of the strip-shaped tooth root 44 is straight and aligned with the butt joint surface ( Figure 1 The strip-shaped tooth root 44 extends in a direction away from the butt joint surface to form a rack-shaped structure including a panel mortise 42 and a panel tenon; correspondingly, the middle position of the prefabricated cover plate 3 is as follows Figure 5 As shown, the strip area 33 is concave as a whole, and is used to fit with the upper surface of the straight strip tooth root 44. The two sides of the strip area 33 are concave at a set distance to form a cover plate tenon and a cover plate mortise 32, forming an upper tooth structure 31, which is used to mesh with the lower tooth structure 43. Figure 6 As shown, the relative movement of adjacent UHPC precast bridge panels 1 in the longitudinal direction of the bridge is limited by the meshing of the lower tooth structure 43 with the upper tooth structure 31, and the relative movement of adjacent UHPC precast bridge panels 1 in the transverse direction of the bridge is limited by the mutual cooperation of the strip tooth roots 44 with the concave strip area 33 of the precast cover plate.

[0053] like Figure 1 As shown, the tongue-and-groove structure 41 includes a tenon 411 protruding on one side and a mortise 412 recessed on the other side. The insertion direction of the tenon 411 and the mortise 412 is parallel to the bridge deck to limit the relative movement of adjacent UHPC precast bridge panels 1 in a direction perpendicular to the bridge deck. The tongue-and-groove structure 41 is the same as the stiffening rib 12 and is a structure integrally formed with the UHPC precast bridge deck 1. Its length is the same as the length of the UHPC precast bridge deck 1 along the longitudinal direction of the bridge.

[0054] Since the reserved casting area 11 and the contact position 4 of the adjacent UHPC precast bridge deck are provided, the UHPC precast bridge deck 1 is a structure of unequal thickness, and its lower surface is convex at the stiffening ribs 12 and has increased thickness at the reserved casting area 11 and the tongue-and-groove structure 41 and the lower toothed structure 43.

[0055] like Figure 2 As shown, the reserved hole 13 passes through the UHPC prefabricated bridge deck 1 , so the tongue-and-groove structure 41 on the contact position 4 is located below the reserved hole 13 , and the lower tooth-shaped structure 43 is located above the reserved hole 13 .

[0056] Epoxy resin glue is filled between the butt joint surfaces of the tongue-and-groove structure 41 and between the upper toothed structure 31 and the lower toothed structure 43 .

[0057] The construction method of the assembled detachable composite beam bridge of this embodiment comprises the following steps:

[0058] S1, such as Figure 1 As shown, the steel beam 2 is set at the construction position, and two adjacent UHPC prefabricated bridge panels 1 are erected above the steel beam 2. The longitudinal connector 61 (high-strength bolt) is installed from the bottom of the installation panel of the steel beam 2, so that the end of the longitudinal connector 61 is located in the reserved cavity of the reserved casting area 11, and the nut 62 (high-strength bolt nut) is fixed from the top of the installation panel; during the erection of the UHPC prefabricated bridge panel 1, epoxy resin glue is applied on the contact surface, and the installation of the tongue and groove structure 41 is completed. After the installation is completed, the reserved holes 13 of the two adjacent UHPC prefabricated bridge panels 1 are interconnected, and the relative positions of the two adjacent lower tooth structures 43 are the same as the relative positions of the upper tooth structures 31 of the prefabricated cover plate 3, so that the prefabricated cover plate 3 can be accurately installed.

[0059] S2, press the side of the UHPC prefabricated bridge deck 1 to make the two UHPC prefabricated bridge decks 1 tightly connected, install the tension rods 53 in the reserved holes 13 of the UHPC prefabricated bridge deck 1, and after prestressing the tension rods 53, fill the reserved holes 13 with UHPC materials (the strength grade of the UHPC materials filled here must be greater than or equal to the strength grade of the UHPC prefabricated bridge deck 1), so that the tension rods 53 and the UHPC prefabricated bridge deck 1 form a unified whole, and then as follows Figure 5 As shown, an anchor (including a pad 51 and a nut 52) ​​is installed at the end of the tension rod 53 located in the reserved casting area 11.

[0060] S3. Cast UHPC material in the reserved casting area 11, fix the ends of the longitudinal connector 61 and the ends of the tension rod 53 in the UHPC material in the reserved casting area 11, and fix the UHPC prefabricated bridge deck 1 and the steel beam 2 as a whole.

[0061] S4. Apply epoxy resin glue on the surface of the lower tooth structure 43 of the UHPC prefabricated bridge deck 1 and the surface of the upper tooth structure 31 of the prefabricated cover plate 3, and install the prefabricated cover plate 3 above the contact position 4 so that the upper tooth structure 31 and the lower tooth structure 43 are meshed with each other, and all the prefabricated cover plates 3 are installed one by one along the longitudinal direction of the bridge so that the prefabricated cover plates 3 and the UHPC prefabricated bridge decks 1 on both sides form a whole to form a flat bridge deck.

[0062] If transportation conditions permit, the connection steps of the UHPC prefabricated bridge deck 1 and the steel beam 2 and the connection steps of the tongue and groove structure 41 in S1 can be completed in the prefabrication plant to save on-site construction time.

[0063] In S4, Figure 7 As shown, since the lower tooth structure 43 and the upper tooth structure 31 are inclined at a set angle, the prefabricated cover plate 3 should be installed in an oblique pushing manner.

[0064] In the above process, the wet operation only includes pouring UHPC materials into the reserved holes 13 and the reserved pouring area 11. Since the reserved pouring area 11 is the installation panel of the steel beam 2 as the bottom surface, the safety hazard of wet operation is relatively small. After the UHPC prefabricated bridge deck 1 and the steel beam 2 are fixed, the prefabricated cover plate 3 is laid and installed above the contact position 4. The process only involves assembly work, no wet operation, and only operates on the upper surface of the UHPC prefabricated bridge deck 1. Although the bottom of the contact position 4 is suspended, the safety hazard is still relatively small.

[0065] During disassembly, the longitudinal connector 61 is removed from under the installation panel, and the UHPC material filled in the reserved casting area 11 is cleaned to reduce the integrity between the steel beam 2 and the UHPC prefabricated bridge deck 1, so that the UHPC prefabricated bridge deck 1 is easy to disassemble and convenient for the maintenance and replacement of the bridge deck.

[0066] During disassembly, the bolts and nuts at the bottom of the steel beam are unscrewed to reduce the connection between the steel beam and the bridge deck, and then the cover plate is gradually destroyed to reduce the connection between the bridge decks. After that, the grouting groove area is demolished in a small area and the prestressed anchor is removed to reduce the connection between the bridge decks. Then the adjacent bridge decks are hoisted down and replaced as a whole.

[0067] When a single UHPC precast bridge deck 1 needs to be replaced: first, remove the bolts and nuts at the bottom of the steel beam 2 to reduce the connection between the steel beam 2 and the UHPC precast bridge deck 1; then gradually destroy the precast cover plate 3 to reduce the connection between the UHPC precast bridge deck 1 to be replaced and its adjacent UHPC precast bridge deck 1; then, perform a small area demolition on the reserved casting area 11 and remove the installation anchors (including pads 51 and nuts 52) of the prestressed tension rods 53 to further reduce the connection between the bridge decks; then the UHPC precast bridge deck 1 can be hoisted down and replaced as a whole; the cost of maintenance and replacement using this solution is relatively cheap.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An assembled detachable composite beam bridge, characterized in that: It comprises steel beams and UHPC prefabricated bridge decks arranged in the transverse direction of the bridge; vertical longitudinal connectors are installed on the steel beams, and the ends of the longitudinal connectors are located in a reserved casting area of ​​the UHPC prefabricated bridge deck, and the reserved casting area includes a plurality of reserved cavities that penetrate up and down; The UHPC prefabricated bridge deck is provided with a plurality of reserved holes in the transverse direction of the bridge, and tension rods are provided in the reserved holes. The tension rods connect adjacent UHPC prefabricated bridge decks, and the ends of the tension rods are located in the reserved cavities; The butt joint surface of the contact position between adjacent UHPC prefabricated bridge panels is a tongue-and-groove structure, the contact position is covered with a prefabricated cover plate, the upper surface of the contact position is provided with a lower toothed structure arranged along the longitudinal direction of the bridge, and the lower surface of the prefabricated cover plate is provided with an upper toothed structure that meshes with the lower toothed structure.

2. The assembled detachable composite beam bridge according to claim 1, characterized in that: The steel beam is provided with a horizontal upward mounting panel, the mounting panel is in contact with the bottom surface of the UHPC prefabricated bridge deck, and the longitudinal connector passes through the mounting panel of the steel beam; Optionally, a single UHPC prefabricated bridge deck is supported by a plurality of steel beams, and stiffening ribs are provided on the lower surface of the UHPC prefabricated bridge deck between adjacent steel beams, wherein the length direction of the stiffening ribs is the longitudinal direction of the bridge, and the length thereof is the same as the length of the UHPC prefabricated bridge deck along the longitudinal direction of the bridge.

3. The assembled detachable composite beam bridge according to claim 1, characterized in that: The reserved casting area is cast with UHPC material, the reserved holes are filled with UHPC material, and the strength grade of the UHPC material filled in the casting area is not lower than the strength grade of the UHPC material used for the prefabricated bridge deck.

4. The assembled detachable composite beam bridge according to claim 1, characterized in that: The lower toothed structure is lower than the upper surface of the UHPC prefabricated bridge deck, and the upper surface of the prefabricated cover plate is flush with the upper surface of the UHPC prefabricated bridge deck.

5. The assembled detachable composite beam bridge according to claim 1, characterized in that: The lower toothed structure is inclined at a set angle along the longitudinal bridge direction, and the inclination direction of the upper toothed structure is opposite to that of the lower toothed structure; Optionally, the lower tooth structure includes a strip-shaped tooth root located on the upper surface of the contact position, the upper surface of the strip-shaped tooth root is straight and vertically connected to the docking surface, and the strip-shaped tooth root extends the tooth structure in a direction away from the docking surface.

6. The assembled detachable composite beam bridge according to claim 1, characterized in that: The tongue-and-groove structure on the contact position is located below the reserved hole, and the lower tooth-shaped structure is located above the reserved hole.

7. The assembled detachable composite beam bridge according to claim 1, characterized in that: Epoxy resin glue is filled between the butt joint surfaces of the tongue and groove structure and between the upper toothed structure and the lower toothed structure.

8. A construction method for an assembled detachable composite beam bridge according to any one of claims 1 to 7, characterized in that: Includes steps: S1. Set the steel beam at the construction location, and erect two adjacent UHPC prefabricated bridge decks on the steel beam so that the ends of the longitudinal connectors are located in the reserved cavity of the reserved casting area; S2, press the side of the UHPC precast bridge deck to make the two UHPC precast bridge decks tightly connected, install tension rods in the reserved holes of the UHPC precast bridge deck, and after prestressing the tension rods, fill the reserved holes with UHPC materials, and install anchors at the ends of the tension rods located in the reserved casting area; S3, pouring UHPC material in the reserved pouring area; S4. Apply epoxy resin glue to the lower tooth structure and the upper tooth structure, and install the prefabricated cover plate above the contact position.

9. The construction method of the assembled detachable composite beam bridge according to claim 8, characterized in that: In S4, the prefabricated cover plate is installed by an oblique pushing method.

10. The construction method of the assembled detachable composite beam bridge according to claim 8, characterized in that: During disassembly, the longitudinal connector is pulled out from under the installation panel, and the UHPC material filled in the reserved casting area is cleaned. During disassembly, the bolts and nuts at the bottom of the steel beam are unscrewed to reduce the connection between the steel beam and the bridge deck, and then the cover plate is gradually destroyed to reduce the connection between the bridge decks. Then, the grouting groove area is demolished in a small area and the prestressed anchor is removed to reduce the connection between the bridge decks, and then the adjacent bridge decks are hoisted down and replaced as a whole.

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