A socket-type segmental beam structure and its construction method

Abstract

This invention discloses a socket-type segmental beam structure and its construction method in the field of bridge segmental beam technology. A concave surface is provided on one side of the segmental beam splicing surface, and a convex surface is provided on the other side. The concave surface includes a continuous strip-shaped groove, a deep concave tensioning groove, and a concave prestressing duct opening; the convex surface includes a continuous strip-shaped convex groove, a tensioning groove protrusion, and a convex prestressing duct opening. The concave and convex surfaces are positioned correspondingly. During construction, the outer segmental beam is spliced ​​with the inner segmental beam using a socket-type splicing method. Splicing adhesive is injected into the splicing joint to form a composite splicing surface. After the splicing adhesive has cured, asphalt is injected into the flat groove at the top of the splicing surface of the segmental beam. This structure and method solve the technical problem of water leakage along the splicing joint of the segmental beam, improve the stress state of the splicing adhesive, and the asphalt injection into the flat groove at the top of the segmental beam protects the splicing adhesive from rainwater erosion. The corrugated pipe inside the prestressing duct also provides further waterproofing for the steel strands inside the duct.

Description

Technical Field

[0001] This invention relates to the field of bridge segmental beam technology, specifically a socket-type segmental beam structure and its construction method. Background Technology

[0002] Segmented beams are a type of bridge structure where the bridge beam is divided into multiple segments, prefabricated in a factory, and then transported to the site for assembly. They offer advantages such as rapid construction, controllable quality, and minimal impact on the surrounding environment, and are widely used in various bridge projects. The prefabrication of segmented beams requires high precision, including steel reinforcement processing, formwork installation, and concrete pouring. The significant weight and dimensions of segmented beams necessitate specialized transportation equipment and hoisting solutions. Various connection methods exist between segmented beams, including wet joints, adhesive joints, and dry joints, requiring robust connections and excellent sealing. Prestressed steel bars or steel strands are often used in segmented beams to enhance the bridge's load-bearing capacity and crack resistance.

[0003] Joints between segmental beams are common sites of leakage, including wet joints and adhesive joints. The main causes include: inappropriate selection of sealing materials and improper construction leading to incomplete sealing; insufficient consideration of waterproofing requirements in the segmental beam design, such as unreasonable joint types and inadequate drainage system design; and aging and cracking of waterproofing materials over long-term use, resulting in loss of waterproofing function. Leaking joints affect the aesthetics of the bridge, cause damage to the bridge deck, accelerate the corrosion of the bridge structure, and reduce the bridge's durability and service life. Summary of the Invention

[0004] The purpose of this invention is to provide a socket-type segmental beam structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a socket-type segmental beam structure, wherein a concave surface is provided on one side of the segmental beam splicing surface and a convex surface is provided on the other side. The concave surface includes a continuous strip-shaped groove, a deep concave tensioning groove, and a concave prestressed duct opening. The convex surface includes a continuous strip-shaped convex groove, a tensioning groove protrusion, and a convex prestressed duct opening. The continuous strip-shaped groove is centrally located along the horizontal direction of the bottom plate and the top plate, and centrally located along the vertical direction of the web, forming a closed ring. The continuous strip-shaped convex groove is centrally located along the horizontal direction of the bottom plate and the top plate, and centrally located along the vertical direction of the web, forming a closed ring.

[0006] Preferably, the depth of the strip groove is 5mm greater than the length of the strip protrusion, and the width of the continuous strip groove is 10mm greater than the width of the continuous strip protrusion. The groove completely accommodates the protrusion, while reserving space for glue filling.

[0007] Preferably, the size of the tensioning groove protrusion is smaller than the size of the mating deep concave tensioning groove, and corresponds to the position of the deep concave tensioning groove.

[0008] Preferably, the concave prestressed duct orifice is an enlarged orifice with a diameter larger than that of the prestressed duct; the outer ring of the convex prestressed duct orifice is provided with a protrusion, which is also a corresponding feature.

[0009] Preferably, a compressible corrugated pipe is pre-installed in the middle of the prestressed duct within the segmental beam.

[0010] Preferably, a flat groove is provided on the top of the splicing surface of both side segments of the beam. The flat groove is provided along the end of the top plate of the splicing surface of the segment of the beam, with a width of 3cm and a depth of 2cm.

[0011] This invention also discloses a construction method for a socket-type segmental beam, which uses the above-mentioned socket-type segmental beam structure and includes the following steps:

[0012] S1. Hoisting the pier top segment, both sides of the pier top segment are set as concave surfaces;

[0013] S2. The socket-type segmental beams before and after the pier top segment are symmetrically hoisted. The concave surfaces on both sides of the pier top segment are spliced ​​with the convex surfaces of the socket-type segmental beams hoisted on the outside. The strip-shaped grooves of the convex surfaces are aligned with the strip-shaped grooves of the concave surfaces for socket matching.

[0014] S3. Inject splicing adhesive into the splice joint to form a composite splice surface. After the splicing adhesive has cured, inject asphalt into the flat groove at the top of the splice surface of the segmental beam.

[0015] S4. After splicing and gluing are completed, steel strands are threaded, prestressed and grouted.

[0016] S5. After symmetrically hoisting the outer side of the segmental beam, align the convex groove of the convex surface with the concave groove of the concave surface for socket matching;

[0017] S6. Repeat steps S3-S5 until the distance between the segment beams of the next construction pier segment meets the wet joint standard. Both sides of the wet joint are strip-shaped grooves, and steel plates are embedded in the grooves. The wet joint is then filled with concrete to complete the entire construction segment.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention adopts an external socket-type prestressed duct hole and an internal compressible corrugated pipe combined with adhesive bonding assembly. The gap between the splicing surfaces of the two sections can now be controlled at more than 5mm, which was originally limited to 2-3mm. This provides more space for adjusting the installation line of the segment beam. At the same time, it solves the problem that the gap between the splicing surfaces of the two sections is prone to grout leakage, which can cause blockage of other prestressed duct holes around the prestressed duct hole near the grouting operation and affect the threading of steel strands.

[0020] 2. To solve the technical problem of water leakage along the splice joint of segmental beams, a composite splice surface is formed to block the seepage path. The combination of grooves and convex grooves forms a ring-shaped waterproof structure, which makes the segmental beam compartment a closed space and protects the external prestressed cables inside the compartment from rainwater erosion.

[0021] 3. Improved stress distribution on the splicing adhesive, extending its service life. The splicing joint has been redesigned from a simple vertical stress distribution mode to a multi-mode stress distribution mode involving the upper horizontal surface, lower horizontal surface, vertical surface, and ends. In particular, the adhesive at the ends in the deep grooves is not subject to concentrated stress, being deeply embedded and unaffected by external air and environment, further extending the service life of the splicing adhesive. The groove filling with splicing adhesive and the interlocking of the grooves make the splicing adhesive distribution more uniform and compact, effectively forming a water flow barrier.

[0022] 4. Asphalt is poured into the flat groove at the top of the segmental beam to form the first effective rainwater barrier, protecting the splicing adhesive from rainwater erosion. The corrugated pipes pre-installed inside the prestressed ducts also provide further waterproofing for the steel strands inside the ducts. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the construction section of the two bridge piers of the present invention;

[0024] Figure 2 This is a schematic diagram of the segmental beam concave surface structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the segmental beam convex surface structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the concave prestressed duct orifice of the segmental beam according to the present invention;

[0027] Figure 5 This is a schematic diagram of the convex prestressed duct orifice of the segmental beam according to the present invention;

[0028] Figure 6 This is a schematic diagram of the prestressed pipe and compressible corrugated pipe of the present invention;

[0029] Among them: 1. continuous strip groove; 2. concave prestressed duct orifice; 3. deep concave tensioning slot orifice; 4. continuous strip convex groove; 5. convex prestressed duct orifice; 6. tensioning slot orifice protrusion; 7. compressible corrugated pipe; 8. flat groove. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Please see Figures 1-6 In this embodiment of the invention, a socket-type segmental beam structure is provided with a concave surface on one side of the segmental beam splicing surface and a convex surface on the other side. The concave surface includes a continuous strip-shaped groove 1, a deep concave tensioning groove 3, and a concave prestressed duct opening 2; the convex surface includes a continuous strip-shaped protrusion 4, a tensioning groove protrusion 6, and a convex prestressed duct opening 5; the continuous strip-shaped groove 1 is centered along the horizontal direction of the bottom plate and the top plate, and centered along the vertical direction of the web plate, forming a closed ring; the continuous strip-shaped protrusion 4 is centered along the horizontal direction of the bottom plate and the top plate, and centered along the vertical direction of the web plate, forming a closed ring.

[0033] Among them, the depth of the continuous strip groove 1 is 5mm greater than the length of the continuous strip protrusion 4, and the width of the continuous strip groove 1 is 10mm greater than the width of the continuous strip protrusion 4. The groove completely accommodates the protrusion, while reserving space for glue injection.

[0034] Among them, the size of the tensioning slot protrusion 6 is smaller than the size of the mating deep concave tensioning slot 3, and corresponds to the position of the deep concave tensioning slot 3.

[0035] Among them, the concave prestressed duct orifice 2 is an enlarged orifice with a diameter larger than that of the prestressed duct orifice; the outer ring of the convex prestressed duct orifice 5 is provided with a protrusion, which corresponds to the concave prestressed duct orifice 2.

[0036] Among them, a compressible corrugated pipe 7 is pre-installed in the middle of the prestressed duct in the segmental beam.

[0037] Among them, a flat groove 8 is provided on the top of the splicing surface of the segment beams on both sides. The flat groove 8 is provided along the end of the top plate of the splicing surface of the segment beams, with a width of 3cm and a depth of 2cm.

[0038] Based on the above-mentioned socket-type segmental beam structure, a construction method for socket-type segmental beams is provided, including the following steps:

[0039] S1. Hoisting the pier top segment, both sides of the pier top segment are set as concave surfaces;

[0040] S2. The socket-type segmental beams before and after the pier top segment are symmetrically hoisted. The concave surfaces on both sides of the pier top segment are spliced ​​with the convex surfaces of the socket-type segmental beams hoisted on the outside. The continuous strip-shaped groove 4 of the convex surface is aligned with the continuous strip-shaped groove 1 of the concave surface for socket matching.

[0041] S3. Inject splicing adhesive into the splice joint to form a composite splice surface. After the splicing adhesive has cured, inject asphalt into the flat groove 8 at the top of the splice surface of the segmental beam.

[0042] S4. After splicing and gluing are completed, steel strands are threaded, prestressed and grouted.

[0043] S5. After symmetrically hoisting the outer side of the segmental beam, align the continuous strip groove 4 of the convex surface with the continuous strip groove 1 of the concave surface for socket matching.

[0044] S6. Repeat steps S3-S5 until the distance between the segment beams of the next construction pier segment meets the wet joint standard. Both sides of the wet joint are continuous strip grooves 1. Steel plates are embedded in the grooves, and concrete is poured at the wet joint to complete the entire construction segment.

[0045] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A socket-type segmental beam structure, wherein a concave surface is provided on one side of the splicing surface of the segmental beam, and a convex surface is provided on the other side, characterized in that: The concave surface includes a continuous strip groove (1), a deep concave tensioning groove (3), and a concave prestressed duct opening (2); the convex surface includes a continuous strip convex groove (4), a tensioning groove protrusion (6), and a convex prestressed duct opening (5); the continuous strip groove (1) is centered along the horizontal direction of the bottom plate and the top plate, and centered along the vertical direction of the web plate, forming a closed ring; the continuous strip convex groove (4) is centered along the horizontal direction of the bottom plate and the top plate, and centered along the vertical direction of the web plate, forming a closed ring; The depth of the continuous strip groove (1) is 5 mm greater than the length of the continuous strip protrusion (4), and the width of the continuous strip groove (1) is 10 mm greater than the width of the continuous strip protrusion (4). The size of the tensioning groove protrusion (6) is smaller than the size of the mating deep concave tensioning groove (3), and corresponds to the position of the deep concave tensioning groove (3); The concave prestressed pipe orifice (2) is an enlarged orifice with a diameter larger than that of the prestressed pipe orifice; the outer ring of the convex prestressed pipe orifice (5) is provided with a protrusion, which corresponds to the concave prestressed pipe orifice (2); A compressible corrugated pipe (7) is also pre-installed in the middle of the prestressed duct in the segmental beam; A flat groove (8) is provided on the top of the splicing surface of the segment beams on both sides. The flat groove (8) is provided along the end of the top plate of the splicing surface of the segment beams, with a width of 3cm and a depth of 2cm.

2. A construction method for a socket-type segmental beam, employing the socket-type segmental beam structure described in claim 1, characterized in that, Includes the following steps: S1. Hoisting the pier top segment, both sides of the pier top segment are set as concave surfaces; S2. The socket-type segment beams before and after the pier top segment are symmetrically hoisted. The concave surfaces on both sides of the pier top segment are spliced ​​with the convex surfaces of the socket-type segment beams hoisted on the outside. The continuous strip-shaped groove (4) of the convex surface is aligned with the continuous strip-shaped groove (1) of the concave surface for socket matching. S3. Inject splicing adhesive into the splice joint to form a composite splice surface. After the splicing adhesive has cured, inject asphalt into the flat groove (8) at the top of the splice surface of the segment beam. S4. After splicing and gluing are completed, steel strands are threaded, prestressed and grouted. S5. After symmetrically hoisting the outer side of the segmental beam, align the continuous strip groove (4) of the convex surface with the continuous strip groove (1) of the concave surface for socket matching. S6. Repeat steps S3-S5 until the distance between the segment beams of the next construction pier segment meets the wet joint standard. Both sides of the wet joint are continuous strip grooves (1). Steel plates are embedded in the grooves. The wet joint is filled with concrete to complete the entire construction segment.

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