Arch-beam combined lightweight prefabricated cap beam and construction method thereof

Abstract

The present invention relates to an arch-beam combined lightweight prefabricated cap beam and a construction method thereof. Existing prefabricated cap beams have a large deadweight and high requirements for hoisting and transportation equipment. The present invention includes a cap beam top plate, a cap beam bottom plate, a local reinforcement section of the bottom plate, an arched beam, an inclined rod and a vertical partition; the width of the cap beam bottom plate is less than the width of the cap beam top plate; the local reinforcement section of the bottom plate is located on both sides of the top surface of the cap beam bottom plate; the arched beam is arched upward, and the two ends are respectively connected to the local reinforcement sections of the bottom plate on both sides; the top of the inclined rod is connected to the end of the cap beam top plate, and the bottom is connected to the local reinforcement section of the bottom plate; the top of the vertical partition is connected to the cap beam top plate, and the bottom is connected to the arched beam or the local reinforcement section of the bottom plate. The present invention adopts the overall prefabricated assembly technology for construction, which greatly reduces the construction period and reduces the impact of construction on the surrounding environment and traffic compared with the cast-in-place structure; the deadweight is greatly reduced, the requirements for hoisting and transportation equipment are low, and the overall force performance is better.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated assembled bridge construction, and in particular to an arch-beam combined lightweight prefabricated cap beam and a construction method thereof. Background Art

[0002] Prefabrication and assembly technology has the advantages of shortening construction period and reducing the impact of construction on the environment and traffic, and has become the development trend of bridge construction in the world today. Prefabrication and assembly technology is in a rapid development stage in my country, and is currently mostly used in bridge superstructures. Technologies such as prefabricated small box beams and segmental assembled beams are already very mature. In recent years, my country's research on prefabricated assembled bridge piers has gradually increased and has gradually been applied to actual projects, but research on cap beams is still very scarce.

[0003] The cap beam is the single component with the largest relative weight among the assembleable components of the bridge, and has high requirements for lifting and transportation equipment. At present, the lightweight cap beam is mainly based on segmented prefabricated cap beams. The joints of segmented prefabricated cap beams are the key to affecting the stress performance of the cap beam. When the joints are in the middle, the joint stress is small, but the construction is more complicated because a certain width of wet joints need to be set; when the joints are divided into multiple sections on both sides, the joint stress is large, affecting the overall stress performance of the cap beam; in addition, the joints are prone to water seepage, and the longitudinal reinforcement cutoff affects the force transmission. These factors have restricted the development of lightweight cap beams to a certain extent. The integrally prefabricated cap beam is superior to the segmented prefabricated cap beam in terms of stress performance and construction convenience.

[0004] The traditional solid-section cap beam has a very large deadweight, requires high lifting and transportation equipment, and has a high investment cost; the inner mold of the box-section cap beam cannot be removed, which will affect the overall performance and economic benefits of the cap beam; although the upward-opening cap beam can achieve the reuse of the inner mold, its deadweight is not significantly reduced compared to the traditional solid-section cap beam.

[0005] Therefore, it is necessary to propose a new type of prefabricated cap beam structure that can overcome the above-mentioned defects and promote the application of prefabricated cap beams in the actual construction of prefabricated assembled bridges. Summary of the invention

[0006] The object of the present invention is to provide an arch-beam combined lightweight prefabricated cap beam and a construction method thereof, so as to at least solve the defects of the prior art such as the large deadweight of the prefabricated cap beam and high requirements for lifting and transportation equipment.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] An arch-beam combination lightweight prefabricated cap beam, wherein the arch-beam combination lightweight prefabricated cap beam comprises a cap beam top plate, a cap beam bottom plate, a local reinforcement section of the bottom plate, an arch beam, an oblique rod and a vertical partition;

[0009] The cap beam bottom plate is located below the cap beam top plate, and the width of the cap beam bottom plate is smaller than the width of the cap beam top plate;

[0010] The local reinforcement section of the bottom plate is located on both sides of the top surface of the bottom plate of the cap beam;

[0011] The arched beam is located between the cap beam top plate and the cap beam bottom plate; the arched beam is arched upward, and both ends of the arched beam are respectively connected to the local reinforcement sections of the bottom plate on both sides;

[0012] The oblique rods are located on both sides between the cap beam top plate and the cap beam bottom plate; the top of the oblique rods is connected to the end of the cap beam top plate, and the bottom of the oblique rods is connected to the local reinforcement section of the bottom plate;

[0013] The vertical partition is located between the cap beam top plate and the cap beam bottom plate; the top of the vertical partition is connected to the cap beam top plate, and the bottom of the vertical partition is connected to the arch beam or the local reinforcement section of the bottom plate.

[0014] Furthermore, the local reinforcement section of the bottom plate is a strip-shaped body, which is longitudinally arranged on both sides of the top surface of the bottom plate of the cap beam.

[0015] Furthermore, the oblique rods are inclined inward from top to bottom, and the oblique rods on both sides are symmetrically arranged.

[0016] Furthermore, the vertical partitions are arranged longitudinally, and the vertical lengths of the plurality of vertical partitions gradually increase from the middle of the arch-beam combined lightweight prefabricated cap beam to both sides.

[0017] Furthermore, a connection component capable of being assembled with the bridge pier is preset in the local reinforcement section of the bottom plate.

[0018] Further, the connection assembly includes vertical fine-rolled threaded steel and nuts;

[0019] A vertical bellows channel is preset in the local reinforcement section of the bottom plate, and the top of the vertical bellows channel is a groove with an enlarged aperture; the fine-rolled threaded steel bar is located in the vertical bellows channel, and the nut is installed on the top of the fine-rolled threaded steel bar and is located in the groove.

[0020] Furthermore, a prestressed component is provided in the cap beam bottom plate.

[0021] Further, the prestressed component includes prestressed tendons and anchors;

[0022] A transverse corrugated pipe channel is preset in the bottom plate of the cap beam, the prestressed tendons are located in the transverse corrugated pipe channel, and the ends of the prestressed tendons are anchored outside the transverse corrugated pipe channel through anchors.

[0023] On the other hand, a construction method of the arch-beam combined lightweight prefabricated cap beam as described above is provided, the method comprising:

[0024] The arch-beam combination lightweight prefabricated cap beam including the cap beam top plate, the cap beam bottom plate, the local reinforcement section of the bottom plate, the arch beam, the diagonal rod and the vertical partition is prefabricated through the formwork, and grooves, vertical corrugated pipe channels and transverse corrugated pipe channels are prefabricated on the arch-beam combination lightweight prefabricated cap beam; the bridge piers are prefabricated bridge piers or cast-in-place bridge piers, and vertical high-strength steel bars and steel bar connectors are pre-embedded on the top of the piers during prefabrication or cast-in-place, and the high-strength steel bars and steel bar connectors are in a tightened state;

[0025] Use hoisting equipment to lift the lightweight prefabricated cap beam of the arch beam combination and place it on the bridge pier, ensuring that the positions of the steel bar connector and the corresponding vertical corrugated pipe channel are in a corresponding state; pass the fine-rolled threaded steel bar through the vertical corrugated pipe channel downward to connect with the steel bar connector buried in the bridge pier and tighten it; turn and tighten the nut on the top of the fine-rolled threaded steel bar;

[0026] After the lightweight prefabricated cap beam and the piers of the arch-beam combination are assembled, the prestressed tendons are passed through the transverse corrugated pipe channels and tensioned and anchored by anchors.

[0027] Furthermore, after the prestressed tendons are tensioned and anchored, high-pressure grouting is used to grout the transverse corrugated pipe channels, vertical corrugated pipe channels and grooves.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The arch-beam combined lightweight prefabricated cap beam provided by the present invention is made of UHPC, has low weight and good mechanical properties.

[0030] 2. The lightweight prefabricated cap beam of the arch-beam combination provided by the present invention is constructed using an integral prefabricated assembly technology. Compared with cast-in-place structures, it greatly reduces the construction period and reduces the impact of construction on the surrounding environment and traffic.

[0031] 3. Compared with the segmental prefabricated cap beam, the overall performance and durability of the present invention are better; compared with the solid cross-section cap beam, the self-weight of the present invention is reduced by more than 50%; compared with the upward opening light cap beam, the self-weight is reduced by 25%-35%. Due to the obvious reduction in self-weight, the present invention has lower requirements for hoisting and transportation equipment, does not rely on large-scale on-site hoisting equipment, saves construction costs, and avoids damage to the road surface during transportation and hoisting due to overweight cap beams.

[0032] 4. The arch-beam combination lightweight prefabricated cap beam provided by the present invention has an arch-beam structure. Compared with lightweight cap beams such as box-section cap beams, T-section cap beams, and I-section cap beams, the presence of the arch-beam allows the structure to give full play to the performance and combined effect of the beam bending and the arch compression. In addition, the arch-beam combination lightweight prefabricated cap beam provided by the present invention also has an inclined rod structure. The presence of the inclined rod makes the structure a Nielsen system, which has greater rigidity and good shear resistance, so the overall force performance of the present invention is better.

[0033] 5. The arch-beam combination lightweight prefabricated cap beam provided by the present invention has a structure in the form of an arch-beam combination. During the prefabrication process, the inner mold can be taken out and reused, which has obvious economic advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is a front view of a lightweight prefabricated cap beam of an arch-beam combination in one embodiment of the present invention.

[0036] Figure 2 It is a side view of a lightweight prefabricated cap beam combined with an arch beam in one embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of the connection between the arch-beam combined lightweight prefabricated cap beam and the bridge pier in one embodiment of the present invention.

[0038] Figure 4 It is a cross-sectional view of the bottom plate of the arch-beam combined lightweight prefabricated cap beam in one embodiment of the present invention.

[0039] The symbols in the figure are:

[0040] 1- cap beam top plate, 2- cap beam bottom plate, 3- bottom plate local reinforcement section, 4- arch beam, 5- diagonal rod, 6- vertical partition, 7- finely rolled threaded steel bar, 8- groove, 9- vertical corrugated pipe channel, 10- steel bar connector, 11- high-strength steel bar, 12- nut, 13- transverse corrugated pipe channel, 14- prestressed bar, 15- anchor, 16- pier, 17- joint;

[0041] 701-The threads of the matching end of the high-precision rolled rebar and the nut, 702-The threads of the matching end of the high-precision rolled rebar and the rebar connector. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0043] In the description of this patent, it should be understood that the terms "middle", "both sides", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, 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. Therefore, they cannot be understood as limitations on this patent.

[0044] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set", etc. should be understood in a broad sense, for example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0045] In the description of the specific embodiment, the direction of the length of the prestressed tendon is defined as the transverse direction, that is, Figure 1 From left to right in the figure, the direction perpendicular to the length of the prestressed tendon in the horizontal plane is defined as the longitudinal direction.

[0046] This embodiment provides an arch-beam combination lightweight prefabricated cap beam, which is an integral prefabricated structure and is integrally prefabricated in a factory mold. UHPC materials can be used. The arch-beam combination lightweight prefabricated cap beam includes a cap beam top plate 1, a cap beam bottom plate 2, a bottom plate local reinforcement section 3, an arch beam 4, a diagonal rod 5 and a vertical partition 6. Figure 1 The cap beam bottom plate 2 is located below the cap beam top plate 1, and is arranged horizontally from top to bottom. The lateral width of the cap beam bottom plate 2 is smaller than the lateral width of the cap beam top plate 1. The local reinforcement section 3 of the bottom plate is located on the left and right sides of the top surface of the cap beam bottom plate 2. The arched beam 4 is located between the cap beam top plate 1 and the cap beam bottom plate 2. The arched beam 4 is arched upward, and the left and right ends of the arched beam 4 are respectively connected to the local reinforcement section 3 of the bottom plate on the lateral sides. The diagonal rod 5 is located on the lateral sides between the cap beam top plate 1 and the cap beam bottom plate 2. The top of the diagonal rod 5 is connected to the lateral end of the cap beam top plate 1, and the bottom of the diagonal rod 5 is connected to the local reinforcement section 3 of the bottom plate. The vertical partition 6 is located between the cap beam top plate 1 and the cap beam bottom plate 2. The top of the vertical partition 6 is connected to the cap beam top plate 1, and the bottom of the vertical partition 6 is connected to the arched beam 4 or the local reinforcement section 3 of the bottom plate.

[0047] Combination Figure 1and Figure 2 The local reinforcement section 3 of the bottom plate is a strip-shaped body, which is longitudinally arranged on both sides of the top surface of the cap beam bottom plate 2. In this embodiment, the cross section of the local reinforcement section 3 of the bottom plate is rectangular. In other embodiments, according to the actual force requirements, the cross section of the local reinforcement section 3 of the bottom plate can also present other shapes, and its end surface connected with the arch beam 4, the diagonal rod 5 and the vertical partition 6 can be perpendicular to the arch beam 4, the diagonal rod 5 and the vertical partition 6 respectively.

[0048] like Figure 1 The inclined rods 5 are inclined inward from top to bottom, and the inclined rods 5 on both sides are symmetrically arranged, so that the arch-beam combination lightweight prefabricated cap beam is an isosceles trapezoidal shape with a larger top and a smaller bottom. In other embodiments, the inclination of the inclined rods 5 can also be adjusted according to actual force requirements.

[0049] like Figure 1 , the vertical partitions 6 are arranged longitudinally, and the vertical lengths of the multiple vertical partitions 6 gradually increase from the middle of the arch-beam combined lightweight prefabricated cap beam to both sides. In the present embodiment, 7 vertical partitions 6 are provided. The two longest vertical partitions 6 are located on the left and right sides in the horizontal direction, with the top connected to the cap beam top plate 1, and the bottom connected to the local reinforcement section 3 of the bottom plate. The other vertical partitions 6 are located at the two longest vertical partitions 6, with the top connected to the cap beam top plate 1, and the bottom connected to the arch beam 4. In other embodiments, according to the actual force requirements, the number and vertical length of the vertical partitions 6 can also be adjusted to maintain a horizontal left-right symmetrical arrangement.

[0050] like Figure 2 , the position of the local reinforcement section 3 of the bottom plate corresponds to the position of the pier 16 to be assembled, and a connection component that can be assembled with the pier 16 is preset in the local reinforcement section 3 of the bottom plate. The connection component includes a vertical fine-rolled threaded steel bar 7 and a nut 12. A vertical corrugated pipe channel 9 is preset in the local reinforcement section 3 of the bottom plate, and the top of the vertical corrugated pipe channel 9 is a groove 8 with an enlarged aperture. The fine-rolled threaded steel bar 7 is located in the vertical corrugated pipe channel 9, and the nut 12 is installed on the top of the fine-rolled threaded steel bar 7 and is located in the groove 8. Threads are provided on the fine-rolled threaded steel bar 7, which are threads 701 at the top of the fine-rolled threaded steel bar and the matching end of the nut, and threads 702 at the bottom of the fine-rolled threaded steel bar and the matching end of the steel bar connector. As shown Figure 4 In this embodiment, the bottom plate local reinforcement section 3 is provided with four vertical corrugated pipe channels 9. In other embodiments, the number and position of the vertical corrugated pipe channels 9 can be adjusted according to the cross-sectional area of ​​the pier 16.

[0051] Combination Figure 1 , 2And 3, a prestressed component is arranged in the cap beam bottom plate 2, and prestressing can be carried out after the lightweight prefabricated cap beam of the arch beam combination is assembled with the two bridge piers 16. The prestressed component includes prestressed tendons 14 and anchors 15. A transverse corrugated pipe channel 13 is preset in the cap beam bottom plate 2, and the prestressed tendons 14 are located in the transverse corrugated pipe channel 13. The ends of the prestressed tendons 14 are anchored outside the transverse corrugated pipe channel 13 by anchors 15. In this embodiment, four transverse corrugated pipe channels 13 are arranged in the cap beam bottom plate 2, which are arranged in parallel from front to back and are in the same plane in the cap beam bottom plate 2. In other embodiments, the number and position of the transverse corrugated pipe channels 13 can be adjusted according to the transverse width of the cap beam bottom plate 2.

[0052] The specific construction method of the above-mentioned arch-beam combined lightweight prefabricated cap beam comprises the following steps:

[0053] Step 1: Combine the arch beams with lightweight prefabricated cap beams in the factory

[0054] An arch-beam combination lightweight prefabricated cap beam including a cap beam top plate 1, a cap beam bottom plate 2, a local reinforcement section 3 of the bottom plate, an arch beam 4, a diagonal rod 5 and a vertical partition 6 is prefabricated by formwork, and grooves 8, vertical corrugated pipe channels 9 and transverse corrugated pipe channels 13 are prefabricated on the arch-beam combination lightweight prefabricated cap beam; the pier 16 is a prefabricated pier or a cast-in-place pier, and vertical high-strength steel bars 11 and steel bar connectors 10 are pre-embedded on the top thereof during prefabrication or cast-in-place. The high-strength steel bars 11 and the steel bar connectors 10 are in a tightened state.

[0055] Step 2: Assemble the arch beam combination lightweight cap beam and bridge piers at the construction site

[0056] Use the hoisting equipment to lift the arch-beam combined lightweight prefabricated cap beam and place it on the bridge pier 16, ensuring that the positions of the steel bar connector 10 and the corresponding vertical corrugated pipe channel 9 are in a corresponding state; pass the fine-rolled threaded steel bar 7 through the vertical corrugated pipe channel 9 downward to connect with the steel bar connector 10 buried in the bridge pier 16 and tighten it, and apply 2mm thick epoxy adhesive on the joint 17; turn and tighten the nut 12 on the top of the fine-rolled threaded steel bar 7;

[0057] Step 3: Tensioning and anchoring prestressed tendons

[0058] After the arch-beam combination lightweight prefabricated cap beam and the bridge pier 16 are assembled, the prestressed tendons 14 are passed through the transverse corrugated pipe channel 13 and tensioned and anchored by the anchor 15 .

[0059] Step 4: High-strength grouting

[0060] The high-pressure grouting method is used to perform grouting on the transverse corrugated pipe channel 13, the vertical corrugated pipe channel 9 and the groove 8.

[0061] The arch-beam combined lightweight prefabricated cap beam provided by the present invention is essentially different from the structure of a traditional solid-section cap beam. A lattice-like structure is formed through the arch-beam combined structure, which greatly reduces its own weight while ensuring overall rigidity, saves materials, and reduces the difficulty of lifting and assembly.

[0062] In addition, an arched beam structure is designed. Compared with lightweight cap beams such as box-section cap beams, T-section cap beams, and I-section cap beams, the presence of the arched beam can make the structure fully exert the performance and combined effect of the beam bending and the arch compression. In addition, in the arch-beam combined lightweight prefabricated cap beam provided by the present invention, a diagonal rod structure is also designed. The presence of the diagonal rod makes the structure a Nielsen system, which has greater rigidity and good shear resistance, so the overall force performance of the present invention is better.

[0063] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. Arch-beam combined lightweight prefabricated cap beam, characterized by: The arch-beam combined lightweight prefabricated cap beam comprises a cap beam top plate (1), a cap beam bottom plate (2), a bottom plate local reinforcement section (3), an arch beam (4), an inclined rod (5) and a vertical partition plate (6); The cap beam bottom plate (2) is located below the cap beam top plate (1), and the width of the cap beam bottom plate (2) is smaller than the width of the cap beam top plate (1); The bottom plate local reinforcement section (3) is located on both sides of the top surface of the cap beam bottom plate (2); The arched beam (4) is located between the cap beam top plate (1) and the cap beam bottom plate (2); the arched beam (4) is arched upward, and the two ends of the arched beam (4) are respectively connected to the local reinforcement sections (3) of the bottom plate on both sides; The oblique rods (5) are located on both sides between the cap beam top plate (1) and the cap beam bottom plate (2); the top of the oblique rods (5) are connected to the end of the cap beam top plate (1), and the bottom of the oblique rods (5) are connected to the local reinforcement section (3) of the bottom plate; The vertical partition (6) is located between the cap beam top plate (1) and the cap beam bottom plate (2); the top of the vertical partition (6) is connected to the cap beam top plate (1), and the bottom of the vertical partition (6) is connected to the arch beam (4) or the bottom plate local reinforcement section (3).

2. The arch-beam combined lightweight prefabricated cap beam according to claim 1 is characterized in that: The bottom plate local reinforcement section (3) is a strip-shaped body and is longitudinally arranged on both sides of the top surface of the cap beam bottom plate (2).

3. The arch-beam combined lightweight prefabricated cap beam according to claim 2 is characterized in that: The inclined rods (5) are inclined inward from top to bottom, and the inclined rods (5) on both sides are symmetrically arranged.

4. The arch-beam combined lightweight prefabricated cap beam according to claim 3 is characterized in that: The vertical partitions (6) are arranged longitudinally, and the vertical lengths of the plurality of vertical partitions (6) gradually increase from the middle of the arch-beam combined lightweight prefabricated cap beam to both sides.

5. The arch-beam combined lightweight prefabricated cap beam according to claim 4 is characterized in that: The bottom plate local reinforcement section (3) is preset with a connection component that can be assembled with the bridge pier (16).

6. The arch-beam combined lightweight prefabricated cap beam according to claim 5 is characterized in that: The connection assembly comprises a vertical fine-rolled threaded steel bar (7) and a nut (12); A vertical bellows channel (9) is preset in the local reinforcement section (3) of the bottom plate, and the top of the vertical bellows channel (9) is a groove (8) with an enlarged aperture; the fine-rolled threaded steel bar (7) is located in the vertical bellows channel (9), and the nut (12) is installed on the top of the fine-rolled threaded steel bar (7) and is located in the groove (8).

7. The arch-beam combined lightweight prefabricated cap beam according to claim 6 is characterized in that: A prestressed component is arranged in the cap beam bottom plate (2).

8. The arch-beam combined lightweight prefabricated cap beam according to claim 7 is characterized in that: The prestressed component comprises a prestressed tendon (14) and an anchor (15); A transverse corrugated pipe channel (13) is preset in the cap beam bottom plate (2), the prestressed tendons (14) are located in the transverse corrugated pipe channel (13), and the ends of the prestressed tendons (14) are anchored outside the transverse corrugated pipe channel (13) through anchors (15).

9. The construction method of the arch-beam combined lightweight prefabricated cap beam according to claim 8, characterized in that: The method comprises: A lightweight prefabricated cap beam of an arch beam combination is prefabricated by a template, comprising a cap beam top plate (1), a cap beam bottom plate (2), a local reinforcement section of the bottom plate (3), an arch beam (4), an inclined rod (5) and a vertical partition plate (6), and a groove (8), a vertical corrugated pipe channel (9) and a transverse corrugated pipe channel (13) are prefabricated on the lightweight prefabricated cap beam of the arch beam combination; the bridge pier (16) is a prefabricated bridge pier or a cast-in-place bridge pier, and vertical high-strength steel bars (11) and a steel bar connector (10) are pre-buried on the top of the bridge pier during prefabrication or cast-in-place. The high-strength steel bars (11) and the steel bar connector (10) are in a tightened state; The arch-beam combined lightweight prefabricated cap beam is hoisted by hoisting equipment and placed on the bridge pier (16), ensuring that the positions of the steel bar connector (10) and the corresponding vertical corrugated pipe channel (9) are in a corresponding state; the fine-rolled threaded steel bar (7) is passed through the vertical corrugated pipe channel (9) downwardly to connect with the steel bar connector (10) buried in the bridge pier (16) and tightened; the nut (12) on the top of the fine-rolled threaded steel bar (7) is turned and tightened; After the arch-beam combination lightweight prefabricated cap beam and the bridge pier (16) are assembled, the prestressed tendons (14) are passed through the transverse corrugated pipe channel (13), and the prestressed tendons (14) are tensioned and anchored by the anchor (15).

10. The construction method of the arch-beam combined lightweight prefabricated cap beam according to claim 9 is characterized in that: After the prestressed tendons (14) are tensioned and anchored, high-pressure grouting is used to inject grout into the transverse corrugated pipe channel (13), the vertical corrugated pipe channel (9) and the groove (8).

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