A connecting structure of a steel beam and a concrete abutment and a construction method thereof

Abstract

The application relates to a connecting structure and construction method of a steel beam and a concrete abutment, and belongs to the technical field of bridge structures. The connecting structure and construction method of the steel beam and the concrete abutment comprises an abutment, the abutment comprises a cast-shaped abutment body, an anchor rod connected with the abutment body and an extended steel structure connected with the anchor rod, and a steel beam which is integrally cast with the abutment and comprises a steel beam bottom plate integrally connected with the extended steel structure, a steel beam web connected with the steel beam bottom plate and a transverse partition plate. The application can set the extended steel structure with a mechanical transmission path connected between the steel beam transverse partition plate spacing and the abutment longitudinal extension length, and arrange a plurality of staggered long anchor rods and short anchor rods in the outer ring of the extended steel structure. The plurality of anchor rods can bear the large bending moment generated by the beam end consolidation due to the high material strength and the fully exerted force arm size.

Description

Technical Field

[0001] This application relates to the field of bridge structure technology, and in particular to a connection structure and construction method for a steel beam and a concrete abutment. Background Technology

[0002] With the continuous development of urban modernization, steel beams are widely used due to their light weight and strong span capacity. However, when bridges are limited in structural height and have large spans due to requirements such as landscape, terrain conditions, or clearance, it is usually necessary to consider using a beam end fixation system to reduce the adverse effects on the beam structure. In engineering design, bridges with steel superstructures often use concrete abutments, which involves the connection between the substructure and superstructure made of different materials.

[0003] The fixed-end structure is a crucial link in the transmission of bridge loads from the superstructure to the substructure. The fixed end typically bears a large combined effect of bending moment, torque, and shear force, resulting in complex stress distribution. Considering the rationality of the structural design, the reliability of load transmission, the safety of its own load-bearing capacity, and the ease of construction, the node design of the fixed-end structure is particularly important.

[0004] In traditional bridge types, there are many connection methods, such as pier-beam fixed connection or arch foot fixed connection. For the structure where the steel beam and the abutment intersect at an inverted L-shape at 90 degrees, firstly, compared with the pier-beam fixed connection, the asymmetrical load-bearing characteristics of the single span result in a larger bidirectional bending moment at the fixed end of the abutment, especially the longitudinal bending moment. Secondly, compared with the arch foot fixed connection, the angle at which the straight beam connects to the vertical abutment structure is different from the angle at which the inclined arch rib smoothly inserts into the arch foot foundation, making the design of the connection node more complex.

[0005] Given the stress characteristics and connection angle of the fixed ends of the bridge abutment and the steel beam, how to make the fixed connection structure between the concrete bridge abutment and the steel beam safer, more reliable, and easier and faster to construct is a key technical problem that bridge engineering technicians in this field urgently need to solve. Summary of the Invention

[0006] This application provides a connection structure and construction method for steel beams and concrete abutments, in order to solve the problems of complex connection structures, complex stress, and poor strength in existing concrete abutment and steel beam connection structures in related technologies.

[0007] The first aspect of this application provides a connection structure between a steel beam and a concrete abutment, including:

[0008] The bridge abutment includes a cast-in-place abutment body, anchor bolts connected to the abutment body, and extended steel structures connected to the anchor bolts.

[0009] The steel beam is cast integrally with the abutment. The steel beam includes a bottom plate that is integrally connected with the extended steel structure, a web plate and a transverse diaphragm that are connected to the bottom plate.

[0010] In some embodiments, the extended steel structure includes a horizontal embedded plate disposed below the bottom plate of the steel beam, a load-bearing vertical plate disposed between the horizontal embedded plate and the bottom plate of the steel beam, and a stiffening vertical plate.

[0011] In some embodiments, there are several load-bearing vertical plates, and each load-bearing vertical plate corresponds to the web of the steel beam and the transverse diaphragm.

[0012] In some embodiments, the anchor bolt includes long anchor bolts and short anchor bolts, and there are a plurality of both long anchor bolts and short anchor bolts, which are arranged alternately.

[0013] In some embodiments, the anchor rod has an anchor head at one end inside the abutment body, and the other end extends through the steel structure and the bottom plate of the steel beam in sequence and extends outward;

[0014] The extended end of the anchor rod is connected to the bottom plate of the steel beam by a nut.

[0015] In some embodiments, the anchor head is T-shaped.

[0016] In some embodiments, a vertical insertion frame is provided on the side of the horizontal embedded plate away from the bottom plate of the steel beam;

[0017] The vertical insertion frame is formed by four vertical plates, and the four vertical plates correspond to the force-bearing vertical plate.

[0018] In some embodiments, welding studs are provided on the sides of the four vertical plates in the vertical insertion frame that are far apart from each other.

[0019] In some embodiments, the abutment further includes a bridge beam end back wall cast integrally with the abutment body.

[0020] The second aspect of this application provides a construction method for steel beams and concrete abutments, comprising the following steps:

[0021] The steel beam base plate is welded to the extended steel structure, and the vertical insertion frame is welded to the horizontal embedded plate of the extended steel structure. Welding studs are welded to the perimeter of the vertical insertion frame, so that the steel beam base plate, the extended steel structure and the vertical insertion frame are integrated.

[0022] Several long and short anchor rods are staggered and tied to the steel bars of the abutment body for fixation;

[0023] The welded steel beam base plate, extended steel structure and vertical insertion frame are hoisted to the top of the anchor rod and lowered to be penetrated by the anchor rod, with the penetrating end of the anchor rod protruding.

[0024] The abutment body is poured with concrete to the designated position, and then the steel beam segments are welded to the bottom plate of the steel beam.

[0025] The end of the anchor rod that is away from the abutment body is fixed to the bottom plate of the steel beam with a nut;

[0026] The concrete for the back wall of the bridge abutment beam is poured, and at the same time, micro-expansion concrete is poured into the box formed by the steel beam.

[0027] The beneficial effects of the technical solution provided in this application include:

[0028] By using the spacing of the transverse diaphragms of the steel beams and the longitudinal extension length of the abutments, an extended steel structure with a mechanical transmission path is set up between the two. Several long and short anchor rods are arranged in an alternating manner on its outer ring. Due to the high material strength and fully extended lever arm size of the anchor rods, they can withstand the large bending moment generated by the beam end consolidation.

[0029] The connection between the steel beam and the abutment is achieved by extending the steel structure. Vertical force transmission is realized through the one-to-one correspondence between the main load-bearing vertical plate and the web and transverse diaphragm of the steel beam. Horizontal force transmission is realized through numerous short vertical stiffening plates set around the main load-bearing vertical plate. The force transmission path is clear and the structure is simple, and the connection transition can be completed within a limited height space.

[0030] By prefabricating and embedding steel structural components on-site, they can be integrally cast with the concrete abutment body, which can not only ensure the quality of concrete casting but also shorten the construction period. Anchor bolts are arranged on the outer perimeter of the box girder and can be connected on-site by tightening double nuts, which improves the convenience of construction. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a front view schematic diagram provided for an embodiment of this application;

[0033] Figure 2 A side view schematic diagram provided for an embodiment of this application;

[0034] Figure 3 This is a top view of the extended steel structure provided in the embodiments of this application;

[0035] Figure 4 This is a bottom view of the vertical insertion frame provided in the embodiments of this application.

[0036] 1. Steel beam; 11. Steel beam web; 12. Diaphragm; 13. Steel beam bottom plate; 2. Extended steel structure; 21. Load-bearing vertical plate; 22. Horizontal embedded plate; 23. Stiffening vertical plate; 3. Abutment; 31. Abutment body; 32. Abutment beam end back wall; 4. Anchor bolt; 41. Long anchor bolt; 42. Short anchor bolt; 43. Anchor head; 5. Vertical insertion frame; 6. Weld stud. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] This application provides a connection structure and construction method for steel beams and concrete abutments, which can solve the problems of complex connection structures, complex stress, and poor strength of existing concrete abutment and steel beam connection structures.

[0039] See Figure 1-4 As shown, the first aspect of this application provides a connection structure between a steel beam and a concrete abutment, comprising:

[0040] Bridge abutment 3 includes a cast-in-place abutment body 31, anchor bolts 4 connected to the abutment body 31, and an extension steel structure 2 connected to the anchor bolts 4. Through the anchor bolts 4 and the extension steel structure 2, when the abutment body 31 is poured with concrete, the extension steel structure 2 serves as a transition structure for transmitting force, making the force transmission path clearer.

[0041] The steel beam 1 is cast as a whole with the abutment 3. The steel beam 1 includes a steel beam base plate 13 connected to the extension steel structure 2, a steel beam web plate 11 welded to the steel beam base plate 13, and a transverse diaphragm plate 12.

[0042] In some alternative embodiments, see Figure 1-3 As shown, in the connection structure between the steel beam and the concrete abutment, the extended steel structure 2 includes a horizontal embedded plate 22 welded below the bottom plate 13 of the steel beam, a load-bearing vertical plate 21 welded between the horizontal embedded plate 22 and the bottom plate 13 of the steel beam, and a stiffening vertical plate 23.

[0043] In this embodiment, when there are several steel beam web plates 11 and transverse diaphragms 12, there are also several corresponding load-bearing vertical plates 21. In this embodiment, there are four steel beam web plates 11 and transverse diaphragms 12, and the load-bearing vertical plates 21 correspond to the steel beam web plates 11 and transverse diaphragms 12 respectively. Therefore, it is preferable that there are four load-bearing vertical plates 21.

[0044] The material of the extension steel structure 2 can preferably be Q355 steel. The thickness of the load-bearing vertical plate 21, the web plate 11 of the steel beam and the transverse diaphragm 12 is preferably 30mm. The welding method can preferably be a partially penetrated butt weld. The stiffening vertical plate 23 is distributed on both sides of each load-bearing vertical plate 21 and is welded to the load-bearing vertical plate 21, the bottom plate 13 of the steel beam and the horizontal embedded plate 22 on three sides. The thickness of the steel plate can preferably be 20mm.

[0045] In some alternative embodiments, see Figure 1-2 As shown, in the connection structure between the steel beam and the concrete abutment, the anchor rod 4 includes long anchor rods 41 and short anchor rods 42. There are several long anchor rods 41 and several short anchor rods 42, and the long anchor rods 41 and short anchor rods 42 are arranged alternately.

[0046] The staggered arrangement of long anchor rods 41 and short anchor rods 42 not only facilitates the pouring and vibration of concrete within the abutment body 31, but also disperses the pull-out force of the anchor rods 4 to prevent them from being stressed on the same cross section of the abutment body 31. The diameter of the anchor rods 4 is preferably 60mm, and the material is preferably 40cr.

[0047] In this embodiment, one end of the anchor rod 4 located inside the abutment body 31 is provided with an anchor head 43, and the other end extends through the steel structure 2 and the bottom plate of the steel beam 13 and extends out. The anchor head 43 is T-shaped. The T-shaped anchor head 43 can prevent the anchor rod 4 from being pulled out of the abutment body 31, thereby increasing the stress strength of the anchor rod 4 and increasing the contact area with the concrete of the abutment body 31.

[0048] In some alternative embodiments, see Figure 1-2 and Figure 4 As shown, in the connection structure between the steel beam and the concrete abutment, a vertical insertion frame 5 is welded to the side of the horizontal embedded plate 22 away from the bottom plate 13 of the steel beam. The vertical insertion frame 5 is composed of four vertical plates, all of which are welded to the side of the horizontal embedded plate 22 away from the bottom plate 13 of the steel beam and are embedded in the abutment body 31. When the abutment body 31 is poured, concrete will also be injected into the cavity enclosed by the vertical insertion frame 5.

[0049] In this embodiment, several welding studs 6 are welded to the side of the four vertical plates in the vertical insertion frame 5 that are far apart from each other. The welding studs 6 are arranged in an array with a spacing of 150mm. The welding studs 6 further strengthen the connection between the bridge abutment body 31 and the steel beam 1.

[0050] In some alternative embodiments, see Figure 1As shown, in the connection structure between the steel beam and the concrete abutment, the abutment 3 also includes a back wall 32 at the beam end, which is cast integrally with the abutment body 31. When the abutment 3 is cast, the abutment body 31 is first cast to the designated position, so that the anchor rod 4 and the vertical insertion frame 5 are pre-embedded in the abutment body 31 and cast integrally with the abutment body 31. Then, the web plate 11 and the transverse diaphragm 12 of the steel beam are hoisted and welded to the bottom plate 13 of the steel beam. Next, the back wall 32 at the beam end is cast with concrete, so that the back wall 32 at the beam end is cast integrally with the abutment body 31. Concrete is also poured into the box chamber enclosed by the steel beam 1. The concrete in the box chamber of the steel beam 1 is preferably micro-expansion concrete, which can improve the stability and corrosion resistance of the steel plate itself by filling the box chamber of the steel beam 1.

[0051] See Figure 1-4 As shown, a second aspect of this application provides a construction method for a steel beam and a concrete abutment. This method uses the connection structure described in the above embodiments and includes the following steps:

[0052] Step 101: First, in the factory, prefabricate the steel beam base plate 13 and the horizontal embedded plate 22 to weld the load-bearing vertical plate 21 and the stiffening vertical plate 23 to form an integral unit. Also, prefabricate the segments of the steel beam 1. Weld the vertical insertion frame 5 to the horizontal embedded plate 22 of the extended steel structure 2 and weld the welding studs 6 around the vertical insertion frame 5. Then transport it to the construction site.

[0053] Step 102: During construction, the long anchor rod 41 and the short anchor rod 42 in the anchor rod 4 are arranged around the edge of the bridge abutment body 31 and temporarily fixed together with the steel bars of the bridge abutment body 31. The long anchor rod 41 and the short anchor rod 42 are arranged in an alternating manner.

[0054] Step 103: Then, the welded steel beam base plate 13, the extended steel structure 2, and the vertical insertion frame 5 are hoisted to the top of the anchor rod 4 and lowered from above the anchor rod 4, so that one end of the anchor rod 4 passes through the corresponding slots opened on the horizontal embedded plate 22 and the steel beam base plate 13, and the anchor rod 4 extends through the steel beam base plate 13.

[0055] Step 104: Pour concrete into the abutment body 31 to the designated position, and then weld the segments of the steel beam 1 to the bottom plate 13 of the steel beam.

[0056] Step 105: Secure the end of the anchor rod 4 that extends out of the bottom plate 13 of the steel beam with a nut to complete the construction connection;

[0057] Step 106: Finally, pour concrete for the bridge abutment beam end back wall 32, and at the same time, pour micro-expansion concrete into the box-shaped structure enclosed by steel beam 1.

[0058] The working principle and process of this application:

[0059] First, the anchor rod 4 is temporarily fixed by binding it together with the reinforcing bars of the abutment body 31. Then, the welded steel beam base plate 13, the extended steel structure 2, and the vertical insertion frame 5 are lifted to the top of the anchor rod 4 and lowered from above the anchor rod 4, so that one end of the anchor rod 4 passes through the corresponding slots opened on the horizontal embedded plate 22 and the steel beam base plate 13, and the anchor rod 4 extends out. Concrete is poured into the abutment body 31 to the designated position. After pouring, the steel beam 1 segment is welded to the steel beam base plate 13. The end of the anchor rod 4 that extends out of the steel beam base plate 13 is fixed with a nut. Finally, the concrete of the abutment beam end back wall 32 is poured, and concrete is also poured into the box-shaped structure enclosed by the steel beam 1.

[0060] By using the spacing of the transverse diaphragms 12 of the steel beam 1 and the longitudinal extension length of the abutment 3, an extended steel structure 2 with a clear mechanical transmission path is set between the two. An anchor group consisting of several anchor rods 4 is arranged around its outer ring. Due to its high material strength and fully extended lever arm size, the anchor group can withstand the large bending moment generated by the beam end consolidation. After the steel beam bottom plate 13, the extended steel structure 2 and the vertical insertion frame 5 are prefabricated and pre-embedded on site, they are integrally cast with the abutment body 31. This can not only ensure the quality of concrete pouring, but also shorten the construction period. The anchor rods 4 are arranged on the outer perimeter of the box girder and can be connected on site by tightening with double nuts, which increases the convenience of construction.

[0061] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A connection structure between a steel beam and a concrete bridge abutment, characterized in that, include: Bridge abutment (3), the bridge abutment (3) includes a cast bridge abutment body (31), an anchor rod (4) connected to the bridge abutment body (31), and an extension steel structure (2) connected to the anchor rod (4). The steel beam (1) is cast as a whole with the bridge abutment (3). The steel beam (1) includes a steel beam bottom plate (13) connected to the extension steel structure (2), a steel beam web plate (11) connected to the steel beam bottom plate (13), and a transverse diaphragm plate (12). The extended steel structure (2) includes a horizontal embedded plate (22) spaced below the bottom plate (13) of the steel beam, a load-bearing vertical plate (21) and a stiffening vertical plate (23) disposed between the horizontal embedded plate (22) and the bottom plate (13) of the steel beam. There are several load-bearing vertical plates (21), and each load-bearing vertical plate (21) corresponds to the web plate (11) and the transverse diaphragm plate (12) of the steel beam respectively; The anchor bolt (4) includes a long anchor bolt (41) and a short anchor bolt (42), and there are several of each of the long anchor bolt (41) and the short anchor bolt (42), and the several long anchor bolts (41) and the short anchor bolts (42) are arranged alternately. The anchor rod (4) is provided with an anchor head (43) at one end inside the bridge abutment body (31), and the other end extends through the steel structure (2) and the bottom plate of the steel beam (13) and extends out. The extended end of the anchor rod (4) is connected to the bottom plate (13) of the steel beam by a nut; A vertical insertion frame (5) is provided on the side of the horizontal embedded plate (22) away from the bottom plate (13) of the steel beam; The vertical insertion frame (5) is formed by four vertical plates, and the four vertical plates correspond to the force-bearing vertical plate (21); The box chamber enclosed by the web (11) of the steel beam and the diaphragm (12) is filled with micro-expansion concrete.

2. The connection structure between the steel beam and the concrete abutment as described in claim 1, characterized in that: The anchor head (43) is T-shaped.

3. The connection structure between the steel beam and the concrete abutment as described in claim 1, characterized in that: Welding studs (6) are provided on the side of each of the four vertical plates in the vertical insertion frame (5) that are far apart from each other.

4. The connection structure between the steel beam and the concrete abutment as described in claim 1, characterized in that: The abutment (3) also includes a beam end back wall (32) that is cast integrally with the abutment body (31).

5. A construction method for a steel beam and a concrete abutment, the method using the connection structure for the steel beam and concrete abutment as described in any one of claims 1-4, characterized in that, include: The steel beam base plate (13) is welded to the extended steel structure (2), the vertical insertion frame (5) is welded to the horizontal embedded plate (22) of the extended steel structure (2), and the welding studs (6) are welded to the periphery of the vertical insertion frame (5), so that the steel beam base plate (13), the extended steel structure (2) and the vertical insertion frame (5) are integrated. Several long anchor rods (41) and short anchor rods (42) are staggered and tied to the steel bars of the abutment body (31); The steel beam base plate (13), the extended steel structure (2), and the vertical insertion frame (5) that are welded together are hoisted to the top of the anchor rod (4) and fall through the anchor rod (4), so that the through end of the anchor rod (4) extends out. The abutment body (31) is poured with concrete to the designated position, and then the segments of the steel beam (1) are welded to the bottom plate (13) of the steel beam. The end of the anchor rod (4) that is away from the abutment body (31) is fixed to the bottom plate (13) of the steel beam with a nut; Concrete was poured for the back wall (32) of the bridge abutment beam, and micro-expansion concrete was poured into the box chamber enclosed by the steel beam (1).

Images