Prestressed concrete continuous box girder structure

Abstract

The utility model provides a prestressed concrete continuous box girder structure, and belongs to the technical field of civil bridges. The prestressed concrete continuous box girder structure comprises a box girder main body, wherein a containing cavity of which the two sides are through is defined and formed by the box girder main body; the transverse partition plate is arranged in the containing cavity of the box girder body, and the plane where the transverse partition plate is located is perpendicular to the axis direction of the box girder body; the at least two prestressed fasteners jointly penetrate through the diaphragm plate and the box girder main body and are connected with the outer side wall of the box girder main body in an anchoring manner; wherein the two prestress fasteners extend in the horizontal direction, and the two prestress fasteners are symmetrically arranged on the transverse partition plate. According to the prestressed concrete continuous box girder structure, the transverse prestressed fasteners are arranged at the positions of the transverse partition plates, the tensioning force of the prestressed fasteners can press the two sides of the transverse partition plates, the transverse rigidity of the transverse partition plates is improved, the probability of occurrence of vertical cracks of the transverse partition plates is effectively reduced, and the durability of concrete of the transverse partition plates is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the civil bridge technology field, and particularly relates to a prestressed concrete continuous box girder structure. BACKGROUND

[0002] The prestressed box girder is widely applied in the rail transit bridge engineering due to low cost, convenient construction, good torsional performance and the like. With the increase of the bridge service time, the probability of the prestressed box girder cracking and damaging is also increased. How to improve the durability of the bridge is the research focus in the bridge field in recent years.

[0003] In the related art, the horizontal diaphragm is generally arranged at the segment above the support of the railway continuous box girder. In the bridge operation process, the vertical crack is prone to occur in the horizontal diaphragm, the crack weakens the rigidity and the bearing capacity of the horizontal diaphragm, the local stress performance of the concrete of the bottom plate above the support of the continuous box girder is weakened, and the lateral rigidity of the girder is reduced to a certain extent. The reduction of the local stress performance of the girder will accelerate the damage speed of the concrete of the girder, and the reduction of the lateral rigidity of the girder will directly affect the driving performance on the bridge. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a prestressed concrete continuous box girder structure to solve the technical problem that the vertical crack of the horizontal diaphragm of the continuous box girder in the related art easily affects the lateral rigidity.

[0005] The present application provides a prestressed concrete continuous box girder structure, which comprises:

[0006] A box girder body, which is surrounded to form a cavity with two sides penetrating;

[0007] A horizontal diaphragm, which is arranged in the cavity of the box girder body, and the plane of the horizontal diaphragm is perpendicular to the axial direction of the box girder body;

[0008] At least two prestressed fasteners, which are arranged through the horizontal diaphragm and the box girder body and are anchored and connected to the outer side wall of the box girder body;

[0009] The two prestressed fasteners extend along the horizontal direction, and the two prestressed fasteners are symmetrically arranged on the horizontal diaphragm.

[0010] In a possible implementation, the box girder body comprises a top plate, a bottom plate and two oppositely arranged webs, two sides of the top plate are respectively provided with flange plates, and the horizontal diaphragm is fixedly connected with the top plate, the bottom plate and the web;

[0011] The horizontal diaphragm, the top plate, the bottom plate and the web are all arranged perpendicularly.

[0012] In a possible implementation, the web plate and the transverse plate are provided with a coaxial installation slot penetrating therethrough, and the installation slot is configured to accommodate the prestressed fastener.

[0013] In a possible implementation, the prestressed fastener is a prestressed tendon, and an anchoring installation block is embedded in the web plate, and the prestressed fastener is connected to the anchoring installation block through an anchorage device after penetrating through the web plate.

[0014] In a possible implementation, the anchoring installation block is connected to at least two prestressed fasteners, and each prestressed fastener is connected to the anchoring installation block through an anchorage device.

[0015] In a possible implementation, the anchorage device is provided with a protective member on the outer side thereof.

[0016] In a possible implementation, the transverse plate is provided with a through hole in the central region thereof, and at least two prestressed fasteners are symmetrically arranged relative to the through hole.

[0017] In a possible implementation, the prestressed fasteners are symmetrically arranged in two groups relative to the through hole, each group of the prestressed fasteners includes two prestressed fasteners arranged along the thickness direction of the transverse plate, and the prestressed fasteners in the same group are connected to the box girder body through an anchoring installation block.

[0018] In a possible implementation, the prestressed fastener further comprises:

[0019] at least two reinforcing ribs, and the reinforcing ribs penetrate through the transverse plate and the box girder body.

[0020] In a possible implementation, the prestressed fastener is provided with a reinforcing rib on each side thereof along the height direction.

[0021] The prestressed concrete continuous box girder structure provided in the application is provided with a transverse plate in the cavity of the box girder body, and the plane of the transverse plate is perpendicular to the axial direction of the box girder body, which can improve the overall rigidity and stability of the box girder, and help to disperse and transfer loads and reduce local stress concentration.

[0022] In addition, at least two prestressed fasteners penetrate through the transverse plate and the box girder body and are anchored to the outer side wall of the box girder body, and since the two prestressed fasteners extend along the horizontal direction and are symmetrically arranged on the transverse plate, the prestressed fasteners can press the two sides of the transverse plate, improve the lateral rigidity of the transverse plate, effectively reduce the probability of vertical cracks of the transverse plate, and improve the durability of the transverse plate concrete. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] Figure 1 This is a schematic diagram of the cross-section of the prestressed concrete continuous box girder in the embodiments of this application;

[0025] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0026] Figure 3 This is an outer side view of a prestressed concrete continuous box girder structure.

[0027] Figure 4 This is an inner sectional view of a prestressed concrete continuous box girder structure.

[0028] Figure 5 This is a schematic diagram showing the location of the reinforcing bars in a prestressed concrete continuous box girder structure.

[0029] Explanation of reference numerals in the attached figures

[0030] 1. Top plate; 2. First flange plate; 3. Second flange plate; 4. First web plate; 5. Second web plate; 6. Bottom plate; 7. Diaphragm plate; 8. Anchoring block; 9. Anchor; 10. Prestressed fastener; 11. Installation slot; 12. Reinforcing rib; 13. Through hole.

[0031] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0033] One or more embodiments of this application provide a prestressed concrete continuous box girder structure, which is described below in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, the prestressed concrete continuous box girder structure provided in this embodiment includes a box girder body, a transverse diaphragm 7, and at least two prestressed fasteners 10.

[0035] The box girder body is surrounded by a cavity formed on both sides; the diaphragm 7 is arranged in the cavity of the box girder body, and the plane of the diaphragm 7 is perpendicular to the axis direction of the box girder body; at least two prestressed fasteners 10 are arranged through the diaphragm 7 and the box girder body and are anchored and connected to the outer side wall of the box girder body; wherein the two prestressed fasteners 10 extend in the horizontal direction, and the two prestressed fasteners 10 are symmetrically arranged on the diaphragm 7.

[0036] Through the above arrangement, the plane of the diaphragm 7 is perpendicular to the axis direction of the box girder body, which can improve the overall rigidity and stability of the box girder, and help to disperse and transfer the load and reduce the local stress concentration.

[0037] In addition, at least two prestressed fasteners 10 are arranged through the diaphragm 7 and the box girder body and are anchored and connected to the outer side wall of the box girder body; since the two prestressed fasteners 10 extend in the horizontal direction, and the two prestressed fasteners 10 are symmetrically arranged on the diaphragm 7, the two sides of the diaphragm 7 are pressed by the prestressed fasteners 10, which improves the lateral rigidity of the diaphragm 7, effectively reduces the probability of vertical cracks of the diaphragm 7, and improves the durability of the diaphragm 7 concrete.

[0038] It should be noted that the "left", "right", "up" and "down" and other orientation words mentioned in the embodiments of the present application are explained with reference to the orientation of the continuous box girder during installation.

[0039] Taking the continuous box girder shown in FIG. 1 as an example, Figure 1 In the continuous box girder shown in FIG. 1, Figure 1 The box girder body includes a top plate 1, a bottom plate 6, and two oppositely arranged webs, and the two sides of the top plate 1 are respectively provided with flange plates, and the diaphragm 7 is fixedly connected with the top plate 1, the bottom plate 6 and the web; wherein the diaphragm 7 is perpendicular to the top plate 1, the diaphragm 7 is perpendicular to the bottom plate 6, and the diaphragm 7 is perpendicular to the web.

[0040] That is, the diaphragm 7 is parallel to the cross section of the box girder body, and the side end of the box girder body penetrates through the top plate 1, the bottom plate 6 and the two webs to form a rectangular frame structure.

[0041] For example, the box girder body includes a top plate 1, a first flange plate 2, a second flange plate 3, a first web 4, a second web 5 and a bottom plate 6, the first web 4 and the second web 5 are arranged vertically, the upper edges of the first web 4 and the second web 5 are connected to the two side edges of the top plate 1, the lower edges of the first web 4 and the second web 5 are connected to the two side edges of the bottom plate 6, and the first flange plate 2 and the second flange plate 3 are arranged on the two sides of the top plate 1 and are arranged on the same horizontal plane as the top plate 1.

[0042] The perpendicular arrangement of the top plate 1, the bottom plate 6, the web plate and the cross plate 7 forms a semi-closed box-shaped section, and such a section has high bending stiffness and torsional stiffness. In addition, the fixed connection of the cross plate 7 with the top plate 1, the bottom plate 6 and the web plate further enhances the overall stiffness and stability of the box girder, and reduces deformation and displacement.

[0043] As shown in Figure 2 In some embodiments, the web plate and the cross plate 7 are provided with a coaxial installation slot 11 passing through, and the installation slot 11 is configured to accommodate the prestressed fastener 10.

[0044] The pre-slotted design can ensure the accurate position of the prestressed fastener 10 during installation, reduce installation errors, and at the same time, the prestressed fastener 10 can be directly placed in the pre-set slot, simplifying the construction steps and improving the construction efficiency.

[0045] Further, the prestressed fastener 10 is a prestressed tendon, and the web plate is embedded with an anchoring mounting block 8. After the prestressed fastener 10 passes through the web plate, it is connected with the anchoring mounting block 8 through an anchor 9.

[0046] The prestressed tendon can be a steel wire, a spiral rib steel strand, a threaded steel bar or a carbon fiber reinforced plastic, which is not absolutely limited in the embodiments of the present application.

[0047] The connection between the anchor 9 and the anchoring mounting block 8 can refer to the anchoring design structure of the anchor 9 in the related art. The anchoring mounting block 8 is connected with the anchor 9, and the anchoring mounting block 8 provides a special anchoring position, so that the anchoring of the prestressed tendon is more reliable and stable. The anchoring mounting block 8 can more evenly disperse the stress transmitted by the prestressed tendon, reduce the local stress concentration phenomenon, and improve the overall performance of the structure.

[0048] Generally, as shown in Figure 3 The anchoring mounting block 8 is connected with at least two prestressed fasteners 10, and each prestressed fastener 10 is connected with the anchoring mounting block 8 through an anchor 9.

[0049] Of course, the number of prestressed fasteners 10 installed on the anchoring mounting block 8 can be flexibly set, which is not absolutely limited in the embodiments of the present application.

[0050] The anchoring mounting block 8 disperses the stress of multiple prestressed fasteners 10, reduces the stress concentration phenomenon of a single anchoring point, and improves the stability of the overall anchoring system. In addition, multiple prestressed fasteners 10 are connected with the anchoring mounting block 8 through the anchor 9, which can reduce the workload of on-site adjustment and positioning, and reduce the construction difficulty and risk.

[0051] It should be noted that the anchoring mounting block 8, the anchorage 9 and the prestressed fastener 10 should be on the same axis, preferably, the anchoring mounting block 8, the anchorage 9 and the prestressed fastener 10 are all on the horizontal axis, thereby enhancing the overall lateral stiffness of the box girder.

[0052] In some embodiments, the outer side cover of the anchorage 9 is provided with a protective piece. The protective piece can adopt a cap, protective cloth and the like, and the protective piece seals the anchorage 9 to prevent rain erosion and rust connection installation point.

[0053] As shown in Figure 1 and Figure 4 In some embodiments, the center area of the diaphragm plate 7 is provided with a through hole 13, and at least two prestressed fasteners 10 are symmetrically arranged relative to the through hole 13.

[0054] By providing the through hole 13 on the diaphragm plate 7, the stress distribution of the diaphragm plate 7 can be optimized, and the stress concentration phenomenon can be reduced. The symmetric arrangement of the prestressed fastener 10 relative to the through hole 13 can make the stress more evenly distributed on the diaphragm plate 7, thereby improving the overall stability and crack resistance of the structure.

[0055] In addition, the through hole 13 can reduce the amount of concrete of the diaphragm plate 7, thereby reducing the self weight of the entire structure, facilitating the maintenance of the internal passage of the operating personnel, and the design of the through hole 13 can also improve the ventilation condition inside the box girder, reduce the accumulation of moisture, and thereby prolong the service life of the structure.

[0056] In some embodiments, the prestressed fastener 10 has two groups symmetrically arranged relative to the through hole 13, each group of the prestressed fastener 10 includes two prestressed fasteners 10 arranged along the thickness direction of the diaphragm plate 7, and the prestressed fasteners 10 in the same group are connected to the web plate through the anchoring mounting block 8.

[0057] The arrangement of the two groups of prestressed fasteners 10 increases the redundancy of the system, so that even if one of the prestressed fasteners 10 has a problem, the other fasteners can still provide sufficient support to ensure the safety of the structure. In addition, the connection of the anchoring mounting block 8 and the plurality of anchorage 9 can provide multiple protection, further improving the safety and reliability of the system.

[0058] As shown in Figure 5 In some embodiments, the prestressed concrete continuous box girder structure of the embodiments of the present application further comprises at least two reinforcing ribs 12, and the reinforcing ribs 12 are arranged through the diaphragm plate 7 and the box girder body. Along the height direction, one reinforcing rib 12 is arranged on each side of the prestressed fastener 10.

[0059] The reinforcing rib 12 can be made of steel bar or screw steel, etc. By arranging the reinforcing rib 12, the overall rigidity and stability of the box girder is improved, the bending and shearing resistance of the structure is enhanced, the stress distribution and transmission are optimized, and the lateral rigidity of the diaphragm 7 is improved.

[0060] The specific preparation method of the reinforcing rib 12 includes: when pouring the first web plate 4 or the second web plate 5, the reinforcing rib 12 needs to be implanted; after the prestressed fastener 10 is tensioned and anchored on the anchor 9, the anchor block 8 is poured, and the anchor block wraps the anchor 9 and the reinforcing rib 12. The reinforcing rib 12 is arranged alternately with the prestressed fastener 10.

[0061] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0062] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.

Claims

1. A prestressed concrete continuous box girder structure, characterized in that, include: The main body of the box girder is formed by cavities that run through both sides; A transverse diaphragm (7) is provided in the cavity of the main body of the box girder, and the plane of the transverse diaphragm (7) is perpendicular to the axial direction of the main body of the box girder; At least two prestressed fasteners (10) pass through the diaphragm (7) and the box girder body, and are anchored to the outer wall of the box girder body; The two prestressed fasteners (10) extend in the horizontal direction and are symmetrically arranged on the diaphragm (7).

2. The prestressed concrete continuous box girder structure according to claim 1, characterized in that, The main body of the box girder includes a top plate (1), a bottom plate (6) and two oppositely arranged web plates. Flange plates are respectively constructed on both sides of the top plate (1). The transverse diaphragm (7) is fixedly connected to the top plate (1), the bottom plate (6) and the web plates respectively. The diaphragm (7) and the top plate (1), the diaphragm (7) and the bottom plate (6), and the diaphragm (7) and the web are all arranged perpendicular to each other.

3. The prestressed concrete continuous box girder structure according to claim 2, characterized in that, The web and the diaphragm (7) are provided with coaxial through mounting slots (11), which are configured to accommodate the prestressed fasteners (10).

4. The prestressed concrete continuous box girder structure according to claim 3, characterized in that, The prestressed fastener (10) is a prestressed tendon, and an anchoring block (8) is embedded in the web. After the prestressed fastener (10) passes through the web, it is connected to the anchoring block (8) through an anchor (9).

5. The prestressed concrete continuous box girder structure according to claim 4, characterized in that, At least two prestressed fasteners (10) are connected to the anchoring block (8), and each prestressed fastener (10) is connected to the anchoring block (8) through an anchor (9).

6. The prestressed concrete continuous box girder structure according to claim 4, characterized in that, The outer side of the anchor (9) is covered with a protective cover.

7. The prestressed concrete continuous box girder structure according to claim 4, characterized in that, The central area of ​​the diaphragm (7) has a through hole (13), and at least two of the prestressed fasteners (10) are arranged symmetrically relative to the through hole (13).

8. The prestressed concrete continuous box girder structure according to claim 7, characterized in that, The prestressed fasteners (10) have two sets arranged symmetrically relative to the through holes (13). Each set of prestressed fasteners (10) includes two prestressed fasteners spaced apart along the thickness direction of the diaphragm (7). The same set of prestressed fasteners (10) is connected to the box girder body through an anchoring block (8).

9. The prestressed concrete continuous box girder structure according to claim 1, characterized in that, Also includes: At least two reinforcing ribs (12) are provided, which together pass through the diaphragm (7) and the box girder body.

10. The prestressed concrete continuous box girder structure according to claim 9, characterized in that, Along the height direction, a reinforcing rib (12) is provided on each side of the prestressed fastener (10).

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