Special-shaped multi-girder steel-concrete composite beam for supporting point jacking

Abstract

The utility model discloses a fulcrum jacking special-shaped multi-girder steel-concrete composite beam which comprises a skew beam erected on a beam column, the two ends of the skew beam are fixedly installed on the beam column, the middle fulcrum of the skew beam is placed on the beam column, the skew beam comprises a plurality of longitudinally arranged girders, and the lengths of the girders are sequentially reduced in the first direction; the cross beams are connected with the main beam in a welded mode, the end cross beams on one side are straight beams, and the end cross beams on the other side are oblique beams; the jacking device is arranged between the beam column at the middle fulcrum and the oblique crossing beam, the jacking device is used for jacking the oblique crossing beam, and the jacking height of the jacking device is sequentially increased in the first direction; and the bridge deck slabs are arranged in the sagging moment areas and the hogging moment areas of the skew beams. The jacking devices are arranged at the middle supporting points, and the jacking heights are sequentially increased in the first direction, so that the overall stress of the bridge floor can be basically consistent, and the reliability and stability of a bridge building are improved.

Description

TECHNICAL FIELD

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

[0002] In the field of modern bridge engineering construction, with the diversification of traffic demand and the increase of geographical environment complexity, higher requirements are put forward for the design of bridge structure. The traditional bridge beam structure gradually exposes limitations when facing some special topographic conditions, complex traffic layout and diversified stress demand. For example, in the area with large road skew angle, the conventional orthogonal beam structure is difficult to adapt well, which can easily lead to uneven stress of structure, material waste and increased construction difficulty, etc. At this time, the skew beam needs to be applied, but because the lengths of the main beams of the skew beam are inconsistent, the stress accumulated on the bridge deck slab is also inconsistent, which can greatly affect the reliability and stability of the bridge construction. SUMMARY

[0003] The utility model discloses a special-shaped multi-main beam steel concrete composite beam of fulcrum jacking, which can greatly improve the consistency of stress of the skew beam bridge deck slab in the construction process.

[0004] The utility model provides a special-shaped multi-main beam steel concrete composite beam of fulcrum jacking, which comprises:

[0005] The skew beam is erected on the beam column, both ends of the skew beam are fixedly installed on the beam column, the fulcrum point in the skew beam is placed on the beam column, and the skew beam comprises:

[0006] A plurality of longitudinally arranged main beams, the lengths of the main beams gradually decrease along a first direction;

[0007] A plurality of transversely arranged cross beams, the cross beams are welded and connected with the main beams, one side end cross beam is a straight beam, and the other side end cross beam is an inclined beam;

[0008] A jacking device is arranged between the beam column at the fulcrum point and the skew beam, the jacking device is used for jacking the skew beam, and the jacking height of the jacking device gradually increases along the first direction;

[0009] A bridge deck slab is arranged in the positive bending moment area and the negative bending moment area of the skew beam.

[0010] The utility model has the advantages of:

[0011] The skew bridge structure is composed of a plurality of main beams arranged longitudinally and sequentially decreasing in length along the first direction and special end cross beams (one straight beam and one inclined beam), so that the skew bridge structure can well adapt to special terrains or layout requirements such as skew roads. The jacking devices arranged at the middle support points and sequentially increasing in jacking height along the first direction can be used to accurately adjust the linear shape and elevation of the beam body. During the construction and installation stage, the beam body can be conveniently fine-tuned and positioned. In simulation and construction engineering, experience shows that the greater the jacking height of the bridge deck, the greater the stress of the bridge deck, and the longer the length of the main beam of the skew bridge, the greater the stress of the bridge deck corresponding to the position of the main beam. Therefore, the jacking devices arranged at the middle support points and sequentially increasing in jacking height along the first direction can realize that the stress of the whole bridge deck is basically uniform, and the reliability and stability of the bridge construction are improved.

[0012] According to the utility model, the end cross beams on the two sides of the skew bridge are end reinforcing beams.

[0013] According to the utility model, the middle support points of the skew bridge are provided with middle reinforcing beams.

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

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

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

[0017] Two jacks arranged at intervals are arranged on the cushion block, and the jacks are used to jack the skew bridge.

[0018] A distribution beam is arranged between the jacks and the skew bridge, and the distribution beam is used to disperse the pressure on the skew bridge.

[0019] According to the utility model, the jacking height ranges from 30cm to 60cm.

[0020] According to the utility model, when the design target is to pre-store 10MPa pre-stress on the concrete bridge deck of the middle support points of the six main beams, one jacking device is arranged corresponding to each main beam, and the jacking heights of the jacks are 40.00cm, 40.30cm, 41.94cm, 42.24cm, 43.88cm, 44.18cm, 45.82cm, 46.12cm, 47.76cm, 48.06cm, 49.70cm and 50.00cm in sequence.

[0021] According to the utility model, when the design target is to pre-store 10MPa pre-compression stress of the concrete bridge deck slab at the fulcrum in the six main beams, each main beam corresponds to one lifting device, and the lifting heights of the jacks are 41.00cm, 41.33cm, 43.13cm, 43.46cm, 45.27cm, 45.60cm, 47.40cm, 47.73cm, 49.54cm, 49.87cm, 51.67cm and 52.00cm in sequence.

[0022] According to the utility model, the number of the main beams is 4-8. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further explained in connection with the drawings and embodiments;

[0024] Figure 1 It is the schematic view of the special-shaped multi-main beam steel-concrete composite beam of the fulcrum lifting of the embodiment of the utility model;

[0025] Figure 2 It is the steel beam structure diagram of the special-shaped multi-main beam steel-concrete composite beam of the fulcrum lifting of the embodiment of the utility model;

[0026] Figure 3 It is the lifting device diagram of the special-shaped multi-main beam steel-concrete composite beam of the fulcrum lifting of the embodiment of the utility model;

[0027] Figure 4 It is the linear lifting schematic view of the special-shaped multi-main beam steel-concrete composite beam of the fulcrum lifting of the embodiment of the utility model;

[0028] Figure 5 It is the schematic view of the beam, bridge deck slab and full bridge of the embodiment of the utility model.

[0029] Mark explanation: skew beam 101, main beam 102, cross beam 103, lifting device 104, bridge deck slab 105, bent cap 106, cushion block 107, jack 108, distribution beam 109. DETAILED DESCRIPTION

[0030] 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 form of graphics, 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.

[0031] In the description of the utility model, it needs to be understood that, if the direction description, such as the direction or position relation indicated by up, down, front, back, left, right etc. based on the direction or position relation shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model.

[0032] In the description of the utility model, the meaning of several is one or more, and the meaning of multiple is more than two, and greater than, less than, more than etc. are not included in the number, and above, below, within etc. are included in the number.If the first and second are described, it is only for distinguishing technical features, and cannot 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.

[0033] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0034] Reference Figures 1 to 5 , Figure 1 It is the schematic view of the special-shaped multi-main beam steel-concrete composite beam of the utility model embodiment fulcrum jacking; Figure 2 It is the steel beam structure diagram of the special-shaped multi-main beam steel-concrete composite beam of the utility model embodiment fulcrum jacking; Figure 3 It is the jacking device diagram of the special-shaped multi-main beam steel-concrete composite beam of the utility model embodiment fulcrum jacking; Figure 4 It is the linear jacking schematic view of the special-shaped multi-main beam steel-concrete composite beam of the utility model embodiment fulcrum jacking; Figure 5 It is the schematic view of beam, bridge deck and full bridge of the utility model embodiment.

[0035] In an embodiment, the special-shaped multi-main beam 102 steel-concrete composite beam of fulcrum jacking comprises: a skew beam 101, which is erected on a beam column, both ends of the skew beam 101 are fixedly installed on the beam column, and the skew beam 101 is placed on the beam column at a fulcrum; the skew beam 101 comprises: a plurality of longitudinally arranged main beams 102, the length of the main beam 102 decreases in turn along a first direction; a plurality of transversely arranged cross beams 103, the cross beam 103 is welded and connected with the main beam 102, one side end cross beam 103 is a straight beam, and the other side end cross beam 103 is a skew beam; a jacking device 104, which is arranged between the beam column at the fulcrum and the skew beam 101, and is used for jacking the skew beam 101, the jacking height of the jacking device 104 increases in turn along the first direction; a bridge deck 105, which is arranged in the positive bending moment area and the negative bending moment area of the skew beam 101.

[0036] The skew bridge 101 structure composed of a plurality of main beams 102 arranged longitudinally and decreasing in length along the first direction and special end cross beams 103 (one straight beam and one inclined beam) can well adapt to special terrains or layout requirements such as skew roads. The jacking devices 104 arranged at the middle support points and increasing in jacking height along the first direction can be used to accurately adjust the linear shape and elevation of the beam body. During the construction and installation stage, the beam body can be conveniently fine-tuned and positioned. In simulation and construction engineering, experience shows that the greater the jacking height of the bridge deck, the greater the stress of the bridge deck, and the longer the length of the main beam 102 of the skew bridge 101, the greater the stress of the bridge deck corresponding to the position of the main beam 102. Therefore, by arranging the jacking devices 104 at the middle support points and increasing the jacking height along the first direction, the stress of the entire bridge deck can be basically uniform, and the reliability and stability of the bridge construction can be improved.

[0037] The welded connection of the cross beam 103 and the main beam 102 of different lengths further enhances the integrity of the beam body and can effectively transmit the load from the main beam 102 to the cross beam 103 and then uniformly disperse it to the entire bridge deck structure. This cooperative working mechanism helps to balance the stress in different areas, especially at the junction of the skew bridge 101 and the straight beam and the inclined beam end cross beam 103, which can effectively alleviate the stress concentration phenomenon caused by structural mutations, so that the bridge deck stress can also tend to be uniform in the transverse direction.

[0038] The jacking height of the jacking device 104 at the middle support point increases along the first direction, which cleverly compensates for the inconsistent deformation of the beam body caused by factors such as length difference of the main beam 102 and skew angle. During construction and use, with reasonable adjustment of the jacking height, the main beams 102 and bridge deck slabs 105 at different positions can produce relatively consistent deformation trends when stressed. For example, the longer main beam 102 position may produce a larger deflection due to its own weight and stress, and by adjusting the higher jacking height at the corresponding position, it can be adjusted to a similar linear shape to the shorter main beam 102, so that the stress distribution of the entire bridge deck under vertical load is more uniform. This stress uniformity not only reduces the possibility of cracks in the bridge deck slab 105 due to excessive local stress, but also improves the durability of the bridge during long-term use and reduces maintenance costs.

[0039] During the construction installation process, the jacking device 104 can accurately adjust the linear and elevation of the beam body according to the design requirements, ensuring that each main beam 102 and the bridge deck 105 are in a relatively reasonable stress position in the initial installation state. Through precise control of the jacking height, a part of the stress uneven distribution caused by the structure self-weight and subsequent construction load can be offset in advance. This helps to improve the construction quality, reduce the problem of excessive or uneven initial stress in the structure caused by construction errors, and lays a good foundation for the normal operation of the subsequent bridge. For example, when erecting the bridge deck 105, the bridge deck 105 can be uniformly stressed at the position of each main beam 102 according to the setting of the jacking device 104, avoiding damage to the bridge deck 105 due to excessive local stress during construction, and ensuring the smooth progress of construction and the integrity of the structure.

[0040] Further, the end cross beams 103 on both sides of the skew beam 101 are end reinforcing beams. The end reinforcing beams are arranged at the both ends of the skew beam 101. Due to the complex stress state of the end of the skew beam 101 when stressed, especially at the connection part with the beam column and under the impact and torsion of the vehicle load. The end reinforcing beam can effectively uniformly disperse these complex forces to the adjacent main beams 102 and cross beams 103, improve the integrity of the end structure, and avoid structural damage caused by local stress concentration. For example, when the vehicle enters or exits the skew bridge, the impact force of the wheel on the end can be better transmitted and dispersed through the end reinforcing beam, enhancing the resistance of the end to transverse and longitudinal loads, and improving the safety and reliability of the bridge end.

[0041] The presence of the end reinforcing beam can adjust the stiffness matching relationship between the end cross beam 103 and the main beam 102. For the skew beam 101 structure, the stress distribution in the end region is often uneven, and stress concentration points are prone to occur. The end reinforcing beam can diffuse the stress in the end region from the concentration point to the periphery through its own stiffness and reasonable connection mode, making the stress distribution more uniform. This helps to reduce the possibility of cracks in the bridge deck 105 at the end due to stress concentration, prolongs the service life of the bridge deck 105, and also protects the end of the main beam 102 from excessive local stress damage, ensuring the stability of the entire skew beam 101 structure in the end region.

[0042] When connected with the beam column, the end reinforcing beam can serve as a reinforced connecting component. It can better adapt to the connection complexity brought by the skew angle, provide a more stable and reliable connection interface. Compared with the ordinary end cross beam 103, it can more effectively transmit the internal forces such as shear force and bending moment between the beam body and the beam column, reduce the deformation and damage risk of the connection part, ensure the cooperative working performance of the entire bridge structure system, and improve the safety and stability of the bridge under overall stress.

[0043] Further, the middle support point of the skew beam 101 is provided with a middle reinforcing beam. The middle support point of the skew beam 101 bears a large vertical load and bending moment, and the middle reinforcing beam can significantly increase the cross-sectional stiffness and bearing capacity of the middle support point area. When the vehicle load passes through the middle support point, the middle reinforcing beam can effectively share the pressure borne by the main beam 102, reduce the stress level of the main beam 102 at the middle support point, and prevent local damage or excessive deformation of the main beam 102 due to excessive stress at the middle support point. For example, when a heavy vehicle drives through the middle support point, the middle reinforcing beam can share the huge vertical force with the main beam 102, ensuring the safety and stability of the beam structure and improving the adaptability of the bridge to heavy traffic.

[0044] The arrangement of the middle reinforcing beam can improve the stress flow distribution around the middle support point. During the stress process of the beam, the stress distribution at the middle support point is complex and prone to form a stress concentration area. The middle reinforcing beam can guide the stress to be evenly distributed around the middle support point and its surrounding area through its structure and connection mode with the main beam 102 and the cross beam 103, avoiding stress concentration in a specific position. This helps to improve the durability of the middle support point area, reduce structural fatigue damage and material performance degradation caused by long-term stress concentration, prolong the service life of the bridge, and reduce maintenance costs.

[0045] The middle reinforcing beam, as an important reinforcing component at the middle support point, cooperates with the jacking device 104. When the jacking device 104 adjusts the beam line and elevation, the middle reinforcing beam can provide better support and constraint for the beam, ensuring the structural stability of the middle support point area during the jacking process. At the same time, during the operation of the bridge, the middle reinforcing beam can also enhance the anti-deformation ability of the entire skew beam 101 structure at the middle support point, so that the beam maintains good overall stability under various load combinations, reduces the risk of safety accidents caused by structural instability at the middle support point, and ensures the normal use of the bridge and the safe and smooth traffic.

[0046] Further, the jacking device 104 includes a cap beam 106 arranged on the beam column, a cushion block 107 arranged on the cap beam 106, the cushion block 107 being used to disperse the pressure on the cap beam 106, two jacks 108 arranged at intervals and arranged on the cushion block 107, the jacks 108 being used to jack the skew beam 101, and a distribution beam 109 arranged between the jacks 108 and the skew beam 101, the distribution beam 109 being used to disperse the pressure on the skew beam 101.

[0047] The cushion block 107 is placed on the bent cap 106, and the main function is to disperse the pressure of the jack 108 on the bent cap 106. Because the jack 108 will generate concentrated force during the jacking process, if it directly acts on the surface of the bent cap 106, it may cause local stress of the bent cap 106 to be too large and damage the bent cap 106. The cushion block 107 uniformly disperses the concentrated load of the jack 108 to a larger area of the bent cap 106 by increasing the stress area, reduces the compressive stress level on the surface of the bent cap 106, and effectively protects the structure of the bent cap 106. For example, for some high-strength but relatively thin bent caps 106, the existence of the cushion block 107 can avoid local indentation or cracks caused by the pressure of the jack 108, prolong the service life of the bent cap 106, and at the same time ensure that the jacking force can be more uniformly and stably transmitted to the bent cap 106 and the beam column foundation, improving the reliability of the entire jacking system.

[0048] The two jacks 108 arranged at a distance are the key execution elements to realize the jacking of the skew beam 101. They can accurately apply jacking force according to design requirements, adjust the elevation and alignment of the skew beam 101. Through advanced hydraulic control systems or other control means, the jack 108 can realize precise control of small displacement, meet the high-precision requirements of beam positioning during construction and installation stage and fine operation of beam deformation adjustment during operation and maintenance stage. For example, during the construction of the bridge, when it is necessary to install the skew beam 101 to a specific design elevation and alignment position, the jack 108 can perform jacking operation with millimeter-level or even smaller precision, ensure the precise docking of the beam body with the surrounding structure, and improve the construction quality and efficiency.

[0049] The distance between the two jacks 108 can be flexibly adjusted according to the structural characteristics and stress conditions of the skew beam 101. For skew beams 101 of different widths and different load distributions, by reasonably determining the distance between the jacks 108, the distribution of jacking force on the beam body can be more reasonable, and the deformation characteristics and stress requirements of the beam body can be better adapted. This flexibility enables the jacking device 104 to be widely used in the jacking operation of various types of special-shaped multi-main beam 102 steel-concrete composite beams, improving the versatility and adaptability of the device.

[0050] The distribution beam 109 is located between the jack 108 and the skew beam 101, and its main function is to evenly distribute the jacking force of the jack 108 to the skew beam 101. Because the jacking point of the jack 108 is relatively concentrated, if it is directly applied to the skew beam 101, it may cause local stress of the beam body to be too large and damage the beam body. The distribution beam 109, through its structural design, such as reasonable cross-sectional shape and length, converts the concentrated jacking force into a more uniform distributed load acting on the skew beam 101, avoiding local deformation or damage of the beam body during jacking. For example, when jacking a longer skew beam 101, the distribution beam 109 can evenly transmit the jacking force of the jack 108 to multiple parts of the beam body, ensuring smooth lifting of the entire beam body during jacking, protecting the structural integrity of the beam body, and improving the safety and reliability of jacking operations.

[0051] The distribution beam 109 can also enhance the cooperative working performance between the jack 108 and the skew beam 101. As an intermediate connecting component, it can better coordinate the jacking action of the jack 108 and the stress response of the skew beam 101. Through reasonable connection methods and structural design, the distribution beam 109 can make the jacking forces of multiple jacks 108 work cooperatively on the beam body, avoiding problems such as beam body distortion or deflection caused by uneven or uncoordinated jacking forces. During the bridge operation and maintenance stage, when local or overall adjustment of the beam body is needed, the distribution beam 109 can effectively transmit the adjustment force evenly to the beam body, ensuring the stability and integrity of the beam body during adjustment, and further improving the safety and durability of the bridge structure.

[0052] Further, the jacking height is in the range of 30-60 cm, and can be 30 cm, 40 cm, 50 cm, or 60 cm, and any other value therebetween.

[0053] When the design goal is to pre-store 10 MPa of pre-compression stress on the concrete bridge deck 105 at the fulcrum of the six main beams 102, each main beam 102 corresponds to a jacking device 104, and the jacking height of the jack 108 is 40.00 cm, 40.30 cm, 41.94 cm, 42.24 cm, 43.88 cm, 44.18 cm, 45.82 cm, 46.12 cm, 47.76 cm, 48.06 cm, 49.70 cm, 50.00 cm, respectively. After actual construction detection, it is found that the pre-compression stress of the six main beams 102 is in the range of 9.8-10.2 MPa, fully meeting the error requirements of the design template.

[0054] When the design target is to pre-store 10MPa pre-compression stress of the concrete bridge deck slab 105 at the support point of the six main beams 102, each main beam 102 corresponds to one jacking device 104, and the jacking height of the jack 108 is 41.00cm, 41.33cm, 43.13cm, 43.46cm, 45.27cm, 45.60cm, 47.40cm, 47.73cm, 49.54cm, 49.87cm, 51.67cm, 52.00cm in sequence. It is found through actual construction detection that the pre-compression stress of the six main beams 102 is in the range of 9.8-10.2MPa, which completely meets the error requirement of the design template.

[0055] Further, the number of the main beams 102 is 4-8, which can be 4, 5, 6, 7 or 8.

[0056] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A special-shaped multi-girder steel-concrete composite beam with fulcrum jacking, characterized in that, The utility model relates to a bridge girder structure, comprising: An oblique girder is arranged on the beam column, and two ends of the oblique girder are fixedly arranged on the beam column; a middle support point of the oblique girder is arranged on the beam column; the oblique girder comprises: A plurality of longitudinal main girders are arranged, and lengths of the main girders sequentially decrease along a first direction; A plurality of transverse cross girders are arranged, and the cross girders are welded with the main girders; end cross girders on one side are straight girders, and end cross girders on the other side are oblique girders; A jacking device is arranged between the beam column and the oblique girder at the middle support point, and the jacking device is used for jacking the oblique girder; a jacking height of the jacking device sequentially increases along the first direction; A bridge deck is arranged in positive moment areas and negative moment areas of the oblique girder.

2. The multi-cell steel-concrete composite girder according to claim 1, wherein, End cross girders on two sides of the oblique girder are end reinforcing girders.

3. The multi-cell steel-concrete composite girder according to claim 1, wherein, A middle reinforcing girder is arranged at the middle support point of the oblique girder.

4. The multi-cell steel-concrete composite girder according to claim 1, wherein, The jacking device comprises: A bent cap is arranged on the beam column; A cushion block is arranged on the bent cap, and the cushion block is used for dispersing pressure on the bent cap; Two jacks are arranged on the cushion block at intervals, and the jacks are used for jacking the oblique girder; A distribution girder is arranged between the jacks and the oblique girder, and the distribution girder is used for dispersing pressure on the oblique girder.

5. The multi-cell hybrid steel-concrete composite girder of claim 1, wherein, The jacking height ranges from 30cm to 60cm.

6. The multi-cell steel-concrete composite girder according to claim 4, wherein, When a design target is to pre-store 10MPa pre-compression stress of a concrete bridge deck at a middle support point of six main girders, one jacking device is arranged for each main girder, and jacking heights of the jacks sequentially are 40.00cm, 40.30cm, 41.94cm, 42.24cm, 43.88cm, 44.18cm, 45.82cm, 46.12cm, 47.76cm, 48.06cm, 49.70cm and 50.00cm.

7. The multi-cell steel-concrete composite girder according to claim 4, wherein, When a design target is to pre-store 10MPa pre-compression stress of a concrete bridge deck at a middle support point of six main girders, one jacking device is arranged for each main girder, and jacking heights of the jacks sequentially are 41.00cm, 41.33cm, 43.13cm, 43.46cm, 45.27cm, 45.60cm, 47.40cm, 47.73cm, 49.54cm, 49.87cm, 51.67cm and 52.00cm.

8. The multi-cell hybrid steel-concrete girder of claim 1, wherein, The number of the main girders is 4-8.

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