Beam seam processing structure of small-curve-radius box girder and construction method of beam seam processing structure

Abstract

The invention relates to a beam seam processing structure of a small-curve-radius box beam and a construction method of the beam seam processing structure. The beam seam processing structure comprises a cast-in-place or prefabricated box beam main body structure with a beam end oblique connecting body at the end part; the end face of a beam end connecting body at the front end of the first box beam main body structure is coated with a viscous adhesive, and an elastic joint filling body is bonded; the end face of a beam end connecting body at the rear end of the second box beam main body structure is coated with a sticky adhesive; the beam end connecting body at the rear end of the second box girder main body structure faces the beam end connecting body at the front end of the first box girder main body structure, and main body parts of the two box girder main body structures are arranged in a small curve radius mode; and the second box girder main body structure is moved backwards, so that the girder end connecting body at the rear end of the second box girder main body structure is bonded to the elastic joint filling body, and girder joint treatment of the two box girder main body structures is completed. According to the method, the quality and efficiency of small-curve-radius box girder seam treatment are improved, the safety and durability of a bridge structure are enhanced, and the method is easy to install and maintain and has wide application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a beam seam processing structure of a small curve radius box beam and a construction method thereof. Background Art

[0002] In complex transportation projects such as urban viaducts and flyovers, in order to adapt to the terrain and reduce the space occupied, it is inevitable to adopt a box girder design with a small curve radius. The small curve radius box girder has the characteristics of large torque and large cross slope, and the construction difficulty is also relatively large. Among them, effectively handling the beam joints is a prominent difficulty in this type of project.

[0003] The existing box girder beam seam treatment methods are mostly suitable for straight or large curvature radius bridges. When applied to box girders with small curve radii, they are prone to stress concentration and poor waterproof performance, which in turn affects the overall performance and service life of the bridge. During the construction of box girders with small curve radii, the beam end seams will form a wedge shape, making it impossible to install the expansion joints at the beam ends, and the beam hole box girder wing plates have overlapped at the beam end seams on the inner side of the curve, making it impossible to erect the box girder.

[0004] Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. Summary of the invention

[0005] The purpose of the present invention is to provide a beam joint processing structure for a box girder with a small curve radius and a construction method thereof, so as to solve the problems of stress concentration and poor waterproof performance existing in the existing beam joint processing methods.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A beam joint construction method for a small curve radius box beam, the method comprising:

[0008] The main structure of the box beam with cast-in-place or prefabricated ends and oblique beam end connectors;

[0009] Coating a viscous adhesive on the end surface of the beam end connecting body at the front end of the first box beam main structure, and bonding the elastic caulking body;

[0010] Applying viscous adhesive to the end surface of the beam end connector at the rear end of the second box beam main structure;

[0011] After the first box girder main structure is in place, the beam end connection body at the rear end of the second box girder main structure is placed toward the beam end connection body at the front end of the first box girder main structure, and the end faces of the two are parallel to each other, so that the main part of the first box girder main structure and the main part of the second box girder main structure are arranged in a small curve radius;

[0012] Move the second box girder main structure backwards so that the beam end connector at the rear end of the second box girder main structure is bonded to the elastic filler, thereby completing the beam seam treatment of the two box girder main structures.

[0013] Furthermore, the beam end oblique connection body is arranged on the end surface of the top plate of the box beam main structure;

[0014] The end surface of the beam end oblique connection body is formed into an inclined surface, and the thickness along the line direction gradually decreases from the outer wing plate to the inner wing plate.

[0015] Furthermore, the main structure of the box beam with a beam end oblique connection body at the cast-in-place end includes:

[0016] Formwork erection, reinforcement laying and pouring of the main box girder structure;

[0017] Exposed steel bars are reserved on the end surface of the top plate of the main structure of the box beam;

[0018] On the basis of the exposed steel bars, formwork is erected to arrange the reinforcement and cast the oblique connecting body at the beam end.

[0019] Alternatively, a box beam main structure with a prefabricated end having an oblique beam end connection body comprises:

[0020] The formwork is erected and reinforcement is arranged at the prefabrication site, and the main structure of the box girder and the oblique connecting bodies at the beam ends are cast as a whole, so that the main structure of the box girder and the oblique connecting bodies at the beam ends form an integrated structure.

[0021] On the other hand, a beam seam treatment structure of a small curve radius box beam is provided, the structure comprising two box beam main structures arranged in a small curve radius, and both have beam end oblique connection bodies at the splicing surfaces;

[0022] The beam end oblique connecting body is located on the end surface of the top plate of the box beam main structure, and an elastic filler is sandwiched between the two beam end oblique connecting bodies of the two box beam main structures.

[0023] Furthermore, both side end surfaces of the elastic caulking body are respectively bonded to the end surfaces of the two beam end oblique connecting bodies.

[0024] Furthermore, horizontal reinforcements are arranged in the oblique connecting body of the beam end, and vertical reinforcements are connected between the horizontal reinforcements corresponding to the vertical direction;

[0025] Connecting bars are also arranged in the oblique connecting body at the beam end, and the connecting bars are connected to the horizontal bars and the vertical bars and extend into the main part of the box beam main structure.

[0026] Furthermore, the end surface of the beam end obliquely connected to the body is an inclined surface, which is thick on the outer side and thin on the inner side along the line direction.

[0027] Furthermore, the beam end oblique connector is arranged at the top of the box beam main structure, and is arranged from the outer wing plate to the inner wing plate through the width.

[0028] Furthermore, the top surface of the beam end oblique connecting body is a plane, and the bottom surface is an inclined surface, and the height of the beam end oblique connecting body gradually decreases from close to the box beam main structure to far away from the box beam main structure.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a beam joint processing structure for a box girder with a small curve radius and a construction method thereof, which improves the quality and efficiency of beam joint processing for a box girder with a small curve radius, greatly enhances the safety and durability of the bridge structure through optimized design, is easy to install and maintain, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 It is a plan view of the beam seam processing structure of the present invention.

[0033] Figure 2 It is a schematic elevation diagram of the beam joint processing structure of the present invention.

[0034] Figure 3 It is a cross-sectional schematic diagram of the beam joint processing structure of the present invention.

[0035] The symbols in the figure are:

[0036] 1-main structure of box beam, 2-oblique connector at beam end, 3-elastic filler, 4-structural reinforcement. DETAILED DESCRIPTION

[0037] 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.

[0038] In the description of the present invention, it is necessary to understand that the terms "front", "rear", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", etc. should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integral connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and this should not be construed as a limitation on the order of the steps.

[0041] In a specific implementation, Figure 1 The upper side of is defined as the outer side, Figure 1 The lower side is defined as the inner side.

[0042] A curve is a curved part of a line. The radius of the curve directly affects the speed and safety of vehicles on the line. In general, in actual projects, a line design with a large curve radius is used as much as possible, and the turns are gentler to improve driving safety. However, for some special projects, such as urban viaducts and flyovers, the space occupied by the structure is extremely limited, and the line needs to be designed with a small curve radius. When a box girder is used as the main structural beam, the expansion joint between two adjacent box girders will encounter design and construction difficulties.

[0043] The present invention provides a beam joint construction method for a small curve radius box girder. Through reasonable structural design and targeted construction steps, the beam joint of the small curve radius box girder is properly processed to avoid stress concentration in the structure and ensure the waterproof performance of the beam joint. Specifically, the method includes:

[0044] S1: A box beam main structure 1 with a cast-in-place or prefabricated end having an oblique connecting body 2 at the beam end.

[0045] The box girder main structure 1 adopts a common box girder structure, including a top plate, a bottom plate and web plates on both sides, and wing plates extend from both sides of the top plate.

[0046] The beam end oblique connection body 2 is arranged on the end surface of the top plate of the box beam main structure 1. Figure 1The end face of the oblique connecting body 2 at the beam end is made into an inclined surface, and the thickness along the line direction gradually decreases from the outer wing plate to the inner wing plate. The horizontal cross-section is triangular or trapezoidal, which is equivalent to extending the length of the outer side of the box girder main structure 1, and can smoothly transition from one section of the box girder main structure 1 to another section of the box girder main structure 1.

[0047] The box beam main structure 1 with the beam end oblique connection body 2 can be cast in situ or prefabricated.

[0048] During cast-in-place, firstly, the main box girder structure 1 is cast by formwork and reinforcement is arranged, and exposed steel bars are reserved on the end surface of the top plate of the main box girder structure 1; then, the beam end oblique connector 2 is cast by formwork and reinforcement is arranged on the basis of the exposed steel bars.

[0049] During prefabrication, a formwork is erected and reinforcement is arranged at the prefabrication site, and the main structure 1 of the box girder and the oblique connecting body 2 at the beam end are cast as a whole, so that the main structure 1 of the box girder and the oblique connecting body 2 at the beam end form an integrated structure.

[0050] S2: Coat the end surface of the beam end connector 2 at the front end of the first box beam main structure 1 with a viscous adhesive, and bond the elastic filler 3.

[0051] Viscous adhesives can be polyurethane glue, epoxy resin glue, etc. The concrete at the beam end can be roughened before use to increase the contact area.

[0052] The elastic filler 3 can be made of plate-type rubber elastomer, rebound polyurethane elastomer, etc. The integrity of the material needs to be checked before pasting to ensure that the surface of the filler is not damaged. The ambient temperature during pasting should be between 16 and 24°C.

[0053] S3: Coat the end surface of the beam end connector 2 at the rear end of the second box beam main structure 1 with a viscous adhesive.

[0054] S4: After the first box girder main structure 1 is in place, the beam end connector 2 at the rear end of the second box girder main structure 1 is placed facing the beam end connector 2 at the front end of the first box girder main structure 1, and the end faces of the two are parallel to each other, so that the main part of the first box girder main structure 1 and the main part of the second box girder main structure 1 are arranged in a small curve radius.

[0055] S5: Move the second box girder main structure 1 by hoisting or hydraulic jacking, so that the beam end connecting body 2 at the rear end of the second box girder main structure 1 is bonded to the elastic filling body 3, and the beam seam treatment of the two box girder main structures 1 is completed, and a smooth transition is achieved.

[0056] Repeating this process successively can realize continuous splicing of the multi-section box girder main structure 1 and complete the bridge construction.

[0057] The above construction method obtains a beam joint treatment structure of a small curve radius box beam, which includes two box beam main structures 1 arranged in a small curve radius, and both have beam end oblique connectors 2 at the splicing surface. The beam end oblique connectors 2 are located on the end surface of the top plate of the box beam main structure 1, and an elastic filler 3 is sandwiched between the two beam end oblique connectors 2 of the two box beam main structures 1. The end surfaces of the elastic filler 3 are respectively bonded to the end surfaces of the two beam end oblique connectors 2, which prevents moisture penetration and has a certain degree of elasticity, and can adapt to the displacement of the beam body caused by temperature changes.

[0058] like Figure 3 Horizontal ribs are arranged in the beam end oblique connector 2, and vertical ribs are connected between the corresponding horizontal ribs. Connecting ribs are also arranged in the beam end oblique connector 2, which are connected to the horizontal ribs and the vertical ribs and extend into the main part of the box girder main structure 1. The beam end oblique connector 2 and the box girder main structure 1 are connected to each other as a whole through internal steel bars, or directly cast as a whole, so that the beam end oblique connector 2 is stably fixed on the box girder main structure 1, thereby enhancing the bearing capacity and stability of the entire device.

[0059] like Figure 1 The end face of the beam end obliquely facing the connecting body 2 is an inclined face, which is thick on the outside and thin on the inside along the line direction. Figure 2 The beam end oblique connection body 2 is arranged at the top of the box beam main structure 1, and is arranged from the outer wing plate to the inner wing plate. Figure 3 The top surface of the beam end oblique connecting body 2 is a plane, and the bottom surface is an inclined surface. The height of the beam end oblique connecting body 2 gradually decreases from close to the box beam main structure 1 to far away from the box beam main structure 1.

[0060] The geometric dimensions of the oblique connecting body 2 at the beam end are designed according to the actual curvature of the bridge. The beam end offset E can be calculated by the bisection mid-point method. The formula is: Where L is the beam length, R is the curve radius, and the difference between E and the limit E value of the straight beam (0.05m) is the widening value of the small curve radius.

[0061] The present invention optimizes the design of the box girder structure of the bridge with a small curve radius, and applies an oblique beam end connector 2 for smooth transition at the end thereof, which effectively prevents the beam end seam from presenting a wedge shape, and clamps an elastic filler 3 by bonding, thereby eliminating the need to install a beam end expansion joint structure, and being able to adapt to beam body displacement. The present invention has a reasonable structure, simple construction, and convenient maintenance, thus filling in the gap in beam seam treatment of box girders with a small curve radius.

[0062] 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. A beam joint construction method for a box beam with a small curve radius, characterized in that: The method comprises: A box beam main structure (1) having a cast-in-place or prefabricated end with an oblique beam end connection body (2); Coating a viscous adhesive on the end surface of the beam end connector (2) at the front end of the first box beam main structure (1), and bonding an elastic filler (3); Applying a viscous adhesive to the end surface of the beam end connector (2) at the rear end of the second box beam main structure (1); After the first box girder main structure (1) is in place, the beam end connection body (2) at the rear end of the second box girder main structure (1) is placed facing the beam end connection body (2) at the front end of the first box girder main structure (1), and the end faces of the two are parallel to each other, so that the main part of the first box girder main structure (1) and the main part of the second box girder main structure (1) are arranged in a small curve radius; The second box girder main structure (1) is moved backwards, and the beam end connecting body (2) at the rear end of the second box girder main structure (1) is bonded to the elastic caulking body (3), thereby completing the beam seam treatment of the two box girder main structures (1).

2. The beam joint construction method of a small curve radius box beam according to claim 1, characterized in that: The beam end oblique connecting body (2) is arranged on the end surface of the top plate of the box beam main structure (1); The end surface of the beam end obliquely connected body (2) is formed into an inclined surface, and the thickness along the line direction gradually decreases from the outer wing plate to the inner wing plate.

3. The beam joint construction method of a small curve radius box beam according to claim 2 is characterized in that: A box beam main structure (1) having a cast-in-place end with a beam end oblique connection body (2), comprising: Formwork erection, reinforcement laying and casting of the main box girder structure (1); Exposed steel bars are reserved on the end surface of the top plate of the box girder main structure (1); On the basis of the exposed steel bars, a formwork is erected to arrange the steel bars and cast the oblique connecting body (2) at the beam end.

4. The beam joint construction method of a small curve radius box beam according to claim 2, characterized in that: A box beam main structure (1) having a prefabricated end with a beam end oblique connection body (2), comprising: The formwork is erected and reinforcement is arranged at the prefabrication site, and the box girder main structure (1) and the beam end oblique connection body (2) are integrally cast, so that the box girder main structure (1) and the beam end oblique connection body (2) form an integrated structure.

5. The beam seam treatment structure of the small curve radius box beam is characterized by: The structure comprises two box beam main structures (1) arranged in a small curve radius, and both have beam end oblique connection bodies (2) at the joint surfaces; The beam end oblique connector (2) is located on the end surface of the top plate of the box beam main structure (1), and an elastic filler (3) is sandwiched between the two beam end oblique connectors (2) of the two box beam main structures (1).

6. The beam seam processing structure of a small curve radius box beam according to claim 5, characterized in that: The end surfaces of both sides of the elastic caulking body (3) are respectively bonded to the end surfaces of the two beam end oblique connecting bodies (2).

7. The beam seam processing structure of a small curve radius box beam according to claim 6, characterized in that: Horizontal reinforcements are arranged in the beam end oblique connecting body (2), and vertical reinforcements are connected between the horizontal reinforcements corresponding to the vertical direction; Connecting ribs are also arranged in the beam end oblique connecting body (2), and the connecting ribs are connected to the horizontal ribs and the vertical ribs and extend into the main part of the box beam main structure (1).

8. The beam seam processing structure of a small curve radius box beam according to claim 7, characterized in that: The end surface of the beam end obliquely connected to the body (2) is an inclined surface, which is thick on the outer side and thin on the inner side along the line direction.

9. The beam seam processing structure of a small curve radius box beam according to claim 8, characterized in that: The beam end oblique connecting body (2) is arranged on the top of the box beam main structure (1), and is arranged from the outer wing plate to the inner wing plate through the width.

10. The beam seam processing structure of a small curve radius box beam according to claim 9, characterized in that: The top surface of the beam end oblique connecting body (2) is a plane, and the bottom surface is an inclined surface. The height of the beam end oblique connecting body (2) gradually decreases from close to the box beam main structure (1) to far away from the box beam main structure (1).

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