Special-shaped multi-girder steel-concrete composite beam with balance weight difference adjustment function

Abstract

The utility model discloses a counter weight difference adjustment special-shaped multi-girder steel-concrete composite beam which comprises a variable cross-section beam erected on a beam column, the two ends of the variable cross-section beam are fixedly installed on the beam column, the middle fulcrum of the variable cross-section beam is placed on the beam column, and the variable cross-section beam comprises a plurality of longitudinally-arranged girders and a plurality of transversely-arranged cross beams. The lengths of the cross beams are sequentially reduced in the first direction; the jacking device is arranged between the beam column at the middle fulcrum and the variable cross-section beam, and the jacking device is used for jacking the variable cross-section beam; the bridge deck is arranged in the sagging moment area of the variable cross-section beam; and the balancing weights are arranged on the bridge deck slab and used for optimizing stress distribution of the bridge deck slab. The stress distribution of the whole bridge deck is uniform and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction equipment technical field, especially a kind of special-shaped multi-main girder steel-concrete composite beam of counterweight adjustment difference. BACKGROUND

[0002] With the continuous development of modern bridge engineering construction, the performance requirements of bridge structure are increasingly improved. Steel-concrete composite beam, as a common bridge structure form, has been widely used in long-span bridges. However, the traditional steel-concrete composite beam structure gradually exposes some limitations when facing complex stress conditions and specific design requirements.

[0003] Under some special terrain or traffic layout requirements, the bridge needs to adopt the structure form of special-shaped multi-main girder. Compared with ordinary steel beam structure, the stress distribution of this structure is more complex. Under the action of beam self-weight, vehicle load and environmental factors, stress concentration phenomenon is easy to occur in special-shaped multi-main girder steel-concrete composite beam, especially in the positive bending moment zone. Stress concentration may cause cracks, deformation or even damage of the bridge deck slab, seriously affecting the durability and safety of the bridge, and also increasing the maintenance cost and difficulty in the later period.

[0004] In order to improve this situation, the existing technology has tried various methods. For example, in the aspect of structure design, the stress distribution is adjusted by optimizing the cross-sectional shape and size of main girder and cross beam, but this method is often limited by design specifications, construction technology and material performance, etc., and it is difficult to completely meet the requirements of stress uniformization. In the construction process, the stress condition is also tried to be improved by adjusting the concrete pouring sequence and vibrating mode, but the effect is not ideal. SUMMARY

[0005] The purpose of the utility model is to at least solve the technical problems existing in the prior art, and provide a special-shaped multi-main girder steel-concrete composite beam with counterweight adjustment difference, which can improve the stress distribution.

[0006] The utility model provides a special-shaped multi-main girder steel-concrete composite beam with counterweight adjustment difference, comprising:

[0007] Variable cross-section beam, erected on beam column, both ends of the variable cross-section beam are fixedly installed on the beam column, the fulcrum point in the variable cross-section beam is placed on the beam column, the variable cross-section beam comprises: a plurality of longitudinally arranged main girders and a plurality of transversely arranged cross beams, the length of the cross beam gradually shortens along the first direction;

[0008] Jacking device, arranged between the beam column and the variable cross-section beam at the fulcrum point, the jacking device is used for jacking the variable cross-section beam;

[0009] Bridge deck slab, arranged in the positive bending moment zone of the variable cross-section beam;

[0010] A plurality of counterweights are arranged on the deck slab, and the counterweights are used to optimize the stress distribution of the deck slab.

[0011] The counterweight-adjusted special-shaped multi-main-beam steel-concrete composite beam has the following beneficial effects:

[0012] The counterweight-adjusted special-shaped multi-main-beam steel-concrete composite beam of the present application is provided with a jacking device between the beam column at the middle support point and the variable cross-section beam, which cooperates with the counterweights. The jacking device can accurately adjust the elevation of the beam body during the construction stage or the operation and maintenance process, and in combination with the optimization of the stress distribution by the counterweights, the stress balance state of the structure can be effectively improved, and the ability of the structure to resist instability damage such as overturning and sliding can be enhanced. In particular for the bridge with large span and special-shaped structure, the improvement of stability is crucial to ensure the safety of the bridge in complex environment and long-term use. By arranging a plurality of counterweights on the deck slab, the stress can be adjusted in a targeted manner according to the actual stress of the special-shaped multi-main-beam steel-concrete composite beam under different working conditions (such as different vehicle load distribution, self-weight distribution, etc.). Since the positions and weights of the counterweights can be flexibly configured, the stress concentration phenomenon in the positive bending moment area can be effectively alleviated, and the stress distribution of the deck slab is more uniform and reasonable. After the construction is completed, the counterweights are removed, the jacking device is lowered to the design elevation, and the deck slab in the negative bending moment area is poured, so that the stress distribution of the entire deck slab is uniform and reliable.

[0013] According to the utility model, the counterweight is strip-shaped and is placed directly above the main beam.

[0014] According to the utility model, the jacking device comprises:

[0015] The bent cap is arranged on the beam column.

[0016] The cushion block is arranged on the bent cap and is used to disperse the pressure on the bent cap.

[0017] The jack is arranged on the cushion block and is used to jack up the variable cross-section beam.

[0018] The distribution beam is arranged between the jack and the variable cross-section beam and is used to disperse the pressure on the variable cross-section beam.

[0019] According to the utility model, the deck slab is a cement concrete slab.

[0020] According to the utility model, the cross beams at the two ends of the variable cross-section beam are end reinforcing beams.

[0021] According to the utility model, the middle reinforcing beam is arranged at the middle support point of the variable cross-section beam.

[0022] According to the utility model, the jacking height ranges from 20cm to 40cm.

[0023] According to the utility model, the configuration load of the counterweight block is 100kg / m-200kg / m.

[0024] According to the utility model, the number of the main beams is 4-8. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model will be further illustrated in connection with the drawings and embodiments;

[0026] Figure 1 It is the schematic diagram of the special-shaped multi-main beam steel concrete composite beam of counterweight difference adjustment of the utility model embodiment;

[0027] Figure 2 It is the steel beam structure diagram of the special-shaped multi-main beam steel concrete composite beam of counterweight difference adjustment of the utility model embodiment;

[0028] Figure 3 It is the jacking device diagram of the special-shaped multi-main beam steel concrete composite beam of counterweight difference adjustment of the utility model embodiment;

[0029] Figure 4 It is the bridge deck panel effect diagram of the special-shaped multi-main beam steel concrete composite beam of counterweight difference adjustment of the utility model embodiment;

[0030] Figure 5 It is the counterweight effect diagram of the special-shaped multi-main beam steel concrete composite beam of counterweight difference adjustment of the utility model embodiment.

[0031] Mark explanation: variable cross-section beam 101, main beam 102, cross beam 103, jacking device 104, bridge deck panel 105, counterweight block 106, bent cap 107, cushion block 108, jack 109, distribution beam 110, end reinforcing beam 111, middle reinforcing beam 112. DETAILED DESCRIPTION

[0032] This part will describe the specific embodiments of the utility model in detail, and the preferred embodiments of the utility model are shown in the drawings, and the drawings are used to supplement the description of the text part in the drawings, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0033] In the description of the utility model, need understanding is, relate to the direction description, for example the direction or position relation of indication such as upper, lower, front, back, left, right is based on the direction or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, a particular orientation configuration and operation, therefore can not be understood as the limitation of the utility model.

[0034] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first, second is described, it is only used for distinguishing technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0035] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model combined with the specific content of the technical scheme.

[0036] Refer to Figures 1 to 5 , Figure 1 It is the schematic diagram of the special-shaped multi-main beam steel concrete composite beam of the counterweight adjustment difference of the utility model embodiment; Figure 2 It is the steel beam structure diagram of the special-shaped multi-main beam steel concrete composite beam of the counterweight adjustment difference of the utility model embodiment; Figure 3 It is the jacking device diagram of the special-shaped multi-main beam steel concrete composite beam of the counterweight adjustment difference of the utility model embodiment; Figure 4 It is the deck slab diagram of the special-shaped multi-main beam steel concrete composite beam of the counterweight adjustment difference of the utility model embodiment; Figure 5 It is the counterweight diagram of the special-shaped multi-main beam steel concrete composite beam of the counterweight adjustment difference of the utility model embodiment.

[0037] In an embodiment, the special-shaped multi-main beam 102 steel concrete composite beam of the counterweight adjustment difference comprises: a variable cross-section beam 101, which is erected on a beam column, both ends of the variable cross-section beam 101 are fixedly installed on the beam column, a middle support point of the variable cross-section beam 101 is placed on the beam column, the variable cross-section beam 101 comprises: a plurality of longitudinally arranged main beams 102 and a plurality of transversely arranged cross beams 103, the length of the cross beam 103 is sequentially shortened along a first direction, and the first direction is the direction in which the bridge deck narrows;A jacking device 104 is arranged between the beam column at the middle support point and the variable cross-section beam 101, and the jacking device 104 is used for jacking the variable cross-section beam 101;A deck slab 105 is arranged in the positive bending moment area of the variable cross-section beam 101;A plurality of counterweight blocks 106 are arranged on the deck slab 105, and the counterweight blocks 106 are used for optimizing the stress distribution of the deck slab 105.

[0038] By setting multiple counterweights 106 on the bridge deck slab 105, stress adjustment can be made according to the actual stress conditions of the special-shaped multi-main girder 102 steel-concrete composite beam under different working conditions (such as different vehicle load distributions, self-weight distributions, etc.). Due to the flexible configuration of the positions and weights of the counterweights 106, the stress concentration phenomenon in the positive bending moment zone can be effectively alleviated, and the stress distribution of the bridge deck slab 105 is more uniform and reasonable.

[0039] The special-shaped multi-main girder 102 structure and the design of the length of the cross beam 103 sequentially decreasing along the first direction make the beam body force complex and changeable. The counterweight 106 cooperates with this special structure and can fully consider the cooperative stress relationship between the main girders 102 and the cross beams 103 to optimize the stress system of the entire variable cross-section beam 101. Whether under static load or dynamic load, the mechanical properties of each structural component can be better utilized, the stress singular points caused by irregular structure can be reduced, and the stability and reliability of the entire steel-concrete composite beam structure can be improved.

[0040] The jacking device 104 is set between the beam column at the middle support point and the variable cross-section beam 101 and cooperates with the counterweight 106. The jacking device 104 can accurately adjust the elevation of the beam body during the construction stage or the operation and maintenance process, and in combination with the optimization of the stress distribution of the counterweight 106, the stress balance state of the structure can be effectively improved, and the ability of the structure to resist instability damage such as overturning and sliding can be enhanced. Especially for long-span and special-shaped structure bridges, the improvement of stability is crucial to ensure the safety of the bridge in complex environments and long-term use.

[0041] The counterweight 106 is set on the bridge deck slab 105, and compared with complex reinforcement or modification measures on the internal structure of the beam body, the construction process is relatively simple. During the construction of the bridge, the installation position and weight of the counterweight 106 can be easily adjusted according to the actual structural stress test results, the stress deviation that occurs during the construction process can be corrected in time, the overall construction progress and the installation process of other structural components are not affected, and the construction difficulty and cost are reduced.

[0042] In an embodiment, the steel-concrete composite beam with special-shaped multi-main-beam 102 and counterweight adjustment includes: a variable cross-section beam 101 erected on a beam column, the variable cross-section beam 101 being fixedly installed at both ends on the beam column and placed at a middle support point on the beam column, the variable cross-section beam 101 including a plurality of longitudinally arranged main beams 102 and a plurality of transversely arranged cross beams 103, the lengths of the cross beams 103 being sequentially shortened along a first direction; a jacking device 104 arranged between the beam column at the middle support point and the variable cross-section beam 101, the jacking device 104 being used for jacking the variable cross-section beam 101; a deck slab 105 arranged at a positive moment area of the variable cross-section beam 101; and a plurality of counterweight blocks 106 arranged on the deck slab 105, the counterweight blocks 106 being used for optimizing stress distribution of the deck slab 105. The counterweight blocks 106 are strip-shaped blocks and are placed directly above the main beams 102.

[0043] The number of the jacking devices 104 is consistent with the number of the main beams 102, there is a cross beam 103 at the middle support point position, and one jacking device 104 is correspondingly arranged below the connection position of the cross beam 103 at the middle support point position and all the main beams 102, the cross beam 103 at the middle support point position is jacked to the same height by the jacking device 104, but due to the variable cross-section beam 101, the stress distribution is uneven, and the counterweight blocks 106 are needed to be used for counterweighting, so that the stress of the positive moment area of the deck slab 105 is in a uniform state after pouring, and then the concrete deck slab 105 in a negative moment area is poured, the jacking device 104 is lowered to a design elevation after the concrete deck slab 105 in the negative moment area reaches a design strength, and the counterweight blocks 106 are removed, so that the stress distribution of the entire deck slab 105 is uniform, thereby obtaining better design strength of the bridge deck structure and improving the service life.

[0044] In an embodiment, the steel-concrete composite beam with special-shaped multi-main-beam 102 and counterweight adjustment includes: a variable cross-section beam 101 erected on a beam column, the variable cross-section beam 101 being fixedly installed at both ends on the beam column and placed at a middle support point on the beam column, the variable cross-section beam 101 including a plurality of longitudinally arranged main beams 102 and a plurality of transversely arranged cross beams 103, the lengths of the cross beams 103 being sequentially shortened along a first direction; a jacking device 104 arranged between the beam column at the middle support point and the variable cross-section beam 101, the jacking device 104 being used for jacking the variable cross-section beam 101; a deck slab 105 arranged at a positive moment area of the variable cross-section beam 101; and a plurality of counterweight blocks 106 arranged on the deck slab 105, the counterweight blocks 106 being used for optimizing stress distribution of the deck slab 105.

[0045] The jacking device 104 comprises a cap beam 107 arranged on the beam column, a cushion block 108 arranged on the cap beam 107, the cushion block 108 being used to disperse the pressure on the cap beam 107, a jack 109 arranged on the cushion block 108, the jack 109 being used to jacking the variable cross-section beam 101, and a distribution beam 110 arranged between the jack 109 and the variable cross-section beam 101, the distribution beam 110 being used to disperse the pressure on the variable cross-section beam 101.

[0046] The cap beam 107 is arranged on the beam column and serves as an important foundation support structure of the jacking device 104, which can effectively uniformly transmit the load from the jacking device 104 and the beam body above to the beam column. It increases the contact area between the beam column and the jacking device 104, reduces the local compressive stress, avoids damage or local deformation of the top of the beam column due to excessive concentrated load, and ensures the reliability and stability of the vertical force transmission of the entire structure system during the jacking operation process. It provides a stable and horizontal installation foundation for the subsequent jacking components such as the cushion block 108 and the jack 109. Its relatively flat and regular surface is conducive to accurate installation and positioning of other components, facilitating measurement and adjustment during construction, ensuring the working precision of the components of the jacking device 104, and thus achieving precise control of the jacking operation of the variable cross-section beam 101.

[0047] The cushion block 108 is arranged on the cap beam 107 and mainly serves to further disperse the concentrated pressure transmitted by the jack 109. Since the pressure generated by the jack 109 during jacking is relatively large and concentrated, if directly acting on the cap beam 107, it may cause insufficient local bearing capacity of the cap beam 107. The cushion block 108 increases the contact area with the cap beam 107, reduces the local compressive stress peak of the cap beam 107, effectively protects the cap beam 107 structure, prevents cracks, damage and other problems caused by excessive local pressure, prolongs the service life of the cap beam 107 and ensures the safe operation of the jacking work.

[0048] During jacking, in addition to bearing vertical pressure, some impact or uneven forces may be generated due to factors such as slight deformation, vibration of the beam body or instability of the jack 109. The cushion block 108 can play a certain buffering role to absorb and relieve these additional forces, reduce damage to the cap beam 107 and the jack 109 and other equipment, improve the reliability and durability of the entire jacking system, and reduce equipment maintenance costs and construction risks caused by equipment failure.

[0049] The jack 109 is the core power component of the jacking, and can provide precisely controllable jacking force. In the jacking operation of the special-shaped multi-girder 102 steel-concrete composite beam, whether it is for adjusting the elevation of the beam body, correcting the unevenness of the beam body caused by construction errors or later structural deformation, or adjusting the posture of the beam body for stress distribution optimization with the counterweight 106, the jack 109 can accurately output the size and stroke of the jacking force according to the actual needs, realize the fine adjustment of the height of the beam body, meet the high-precision adjustment requirements of the complex structure under different working conditions, and ensure the safety and use performance of the bridge structure.

[0050] The jack 109 has strong adaptability and can play a role in different construction stages and operation and maintenance scenarios. In the construction stage, it can be used for erection and installation of the beam body, assisting in adjusting the position and elevation of the beam body, and ensuring accurate docking of the beam body with other structural components; in the operation stage, it can be used for beam body deformation repair or structural stress adjustment due to foundation settlement, structural aging, etc., to restore or improve the stress state of the beam body through timely jacking operation, prolong the service life of the bridge, and reduce the possibility of large-scale reconstruction or replacement due to structural diseases, which has significant economic and social benefits.

[0051] The distribution beam 110 is located between the jack 109 and the variable cross-section beam 101, and its role is to uniformly distribute the jacking force provided by the jack 109 to the variable cross-section beam 101. Due to the complex structure and special stress characteristics of the variable cross-section beam 101, especially in the case of the special-shaped multi-girder 102, the stress requirements and bearing capacity at different positions are different. The distribution beam 110 can reasonably distribute the jacking force to each key position according to the structural form and stress characteristics of the beam body, avoid local damage or uneven deformation of the beam body caused by concentrated jacking force, ensure uniform and coordinated stress of the beam body during jacking, and thus realize safe and stable jacking of the beam body.

[0052] In the jacking operation process, in addition to considering the uniform distribution of vertical jacking force, the local stiffness and deformation characteristics of the beam body also need to be considered. The distribution beam 110 can effectively avoid local stress concentration points or unreasonable deformation modes on the beam body caused by direct action of the jacking force through its own structural design and contact mode with the beam body. It can adapt to the surface shape and structural characteristics of the beam body, and transfer the jacking force to the beam body in a relatively soft and uniform manner, reducing the potential damage to the beam body structure, especially for some relatively weak or critical parts (such as the joint of the beam body, the prestressed tendon anchorage area, etc.), playing a good protection role, ensuring the structural integrity and safety of the beam body during jacking.

[0053] Further, the bridge deck slab 105 is a cement concrete slab.

[0054] Further, the cross beam 103 at both ends of the variable cross-section beam 101 is an end reinforcing beam 111.

[0055] The cross beam 103 at both ends of the variable cross-section beam 101 is an end reinforcing beam 111, which plays a key reinforcing role at the beam-column connection position. When the bridge bears various loads, the end is a key node for force transmission, and the reinforcing beam can effectively increase the stiffness and strength of the connection point. Since the end is a region where stress concentration is more obvious, the end reinforcing beam 111 helps to diffuse the stress at the beam end to the surrounding area. Through its own structural characteristics, the concentrated load stress is dispersed to a wider beam body area, making the stress distribution at the beam end more uniform, reducing problems such as concrete cracking and steel yielding caused by excessive local stress, prolonging the service life of the beam end structure, reducing maintenance cost and frequency, and ensuring the safety and reliability of the bridge during long-term use.

[0056] Further, a middle reinforcing beam 112 is arranged at the middle support point of the variable cross-section beam 101. The middle support point of the variable cross-section beam 101 bears a large shear force and bending moment, and the arrangement of the middle reinforcing beam 112 significantly enhances the load-bearing capacity of the middle support point. It can effectively resist the large internal force of the beam body at the middle support point due to dead load, live load, etc., and prevent excessive deformation, cracks, or even damage in the middle support point area. For example, in a long-span bridge, the middle reinforcing beam 112 can more reasonably distribute the concentrated load at the middle support point to the surrounding beam body structure, ensure the structural integrity of the beam body near the middle support point, maintain the normal use function of the bridge, and improve the safety reserve of the bridge.

[0057] Further, the jacking height ranges from 20 cm to 40 cm, and the jacking height can be 20 cm, 30 cm, or 40 cm.

[0058] Further, the configuration load of the counterweight block 106 is 100 kg / m-200 kg / m, and the configuration load of the counterweight block 106 can be 100 kg / m, 150 kg / m, or 200 kg / m.

[0059] Further, the number of the main beams 102 is 4-8, and the number of the main beams 102 can be 4, 5, 6, 7, or 8.

[0060] The above describes the embodiments of the utility model in detail in combination with the drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art in the technical field without departing from the purpose of the utility model.

Claims

1. A special-shaped multi-girder steel-concrete composite beam with counterbalanced weight difference, characterized in that, The utility model relates to a variable cross-section beam, which is arranged on a beam column, and both ends of the variable cross-section beam are fixedly arranged on the beam column, and a middle support point of the variable cross-section beam is arranged on the beam column, and the variable cross-section beam comprises a plurality of longitudinal main beams and a plurality of transverse beams arranged in a transverse direction, and the lengths of the transverse beams gradually decrease in a first direction. A jacking device is arranged between the beam column and the variable cross-section beam at the middle support point, and the jacking device is used for jacking the variable cross-section beam. A bridge deck slab is arranged on a positive bending moment area of the variable cross-section beam. A plurality of counterweights are arranged on the bridge deck slab, and the counterweights are used for optimizing the stress distribution of the bridge deck slab. The counterweight is a strip-shaped block and is arranged directly above the main beam.

2. The specially shaped multi-girder steel-concrete composite beam with counterbalanced weight difference according to claim 1, characterized in that, The jacking device comprises a bent cap arranged on the beam column, a cushion block arranged on the bent cap, a jack arranged on the cushion block, and a distribution beam arranged between the jack and the variable cross-section beam.

3. The specially shaped multi-girder steel-concrete composite beam with counterbalanced weight difference according to claim 1, characterized in that, The bridge deck slab is a cement concrete slab. The transverse beam at both ends of the variable cross-section beam is an end reinforcing beam. A middle reinforcing beam is arranged at the middle support point of the variable cross-section beam. The jacking height ranges from 20 cm to 40 cm. The configuration load of the counterweight ranges from 100 kg / m to 200 kg / m.

4. The specially shaped multi-girder steel-concrete composite beam with counterbalanced weight difference according to claim 1, characterized in that, The number of the main beams ranges from 4 to 8.

5. The specially shaped multi-girder steel-concrete composite beam with counterbalanced weight difference according to claim 1, characterized in that, ​ 6. The specially shaped multi-primary girder steel-concrete composite beam with counterbalanced weight difference according to claim 1, characterized in that, ​ 7. The specially shaped multi-primary girder steel-concrete composite beam with counterbalanced weight difference according to claim 1, characterized in that, ​ 8. The specially shaped multi-primary girder steel-concrete composite beam with counterbalanced weight difference according to claim 1, characterized in that, ​ 9. The specially shaped multi-primary girder steel-concrete composite beam with counterbalanced weight difference according to claim 1, characterized in that, ​

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