Prefabricated combined web for preventing lining concrete from cracking and bridge structure thereof

Abstract

The utility model discloses a prefabricated combined web capable of preventing lining concrete from cracking and a bridge structure thereof, and belongs to the technical field of steel-concrete combined webs, the combined web structurally comprises a corrugated steel web, and a plurality of bolt holes are formed in a horizontal plate of the corrugated steel web; the prefabricated lining concrete is provided with a corrugated side end face which is in matched contact with the corrugated steel web, and a plurality of internal thread sleeves are embedded in the wave crest side end face and the wave trough side end face of the corrugated side end face; in the combined assembly state, the corrugated side end face of the prefabricated lining concrete is attached to the corrugated steel web in a matched mode, and external thread bolts are arranged between the bolt holes and the internal thread sleeves which are matched in a one-to-one paired mode for fastening connection. The prefabricated combined web capable of preventing the lining concrete from cracking has good anti-cracking performance, and durability, fatigue resistance and shock resistance are improved; and compared with on-site lining concrete pouring, a large amount of time is saved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel-concrete composite bridges, and in particular relates to a prefabricated composite web plate for preventing inner lining concrete from cracking and a bridge structure thereof. Background Art

[0002] In recent years, corrugated steel webs have become one of the main bridge structures that have been vigorously promoted and applied due to their light structure, beautiful appearance, reasonable force, good seismic performance, low engineering cost, excellent durability, and green environmental protection. The relevant specifications for corrugated steel web composite bridges stipulate that when the beam height is greater than 5m, it is recommended to set a concrete lining to improve the buckling resistance of the corrugated steel web. However, since the lining concrete is generally constructed by on-site casting, it is subject to large constraints from the corrugated steel web and has a high risk of early cracking, which is prone to shrinkage cracking during the construction period. Current research believes that before the concrete cracks, the corrugated steel web and the lining concrete share the shear force according to the stiffness ratio, but after the concrete cracks, the shear bearing mechanism of the two becomes complicated.

[0003] In order to solve the problem of easy cracking of the inner lining concrete of corrugated steel web composite beams, based on many years of rich practical experience and professional knowledge in the construction of corrugated steel web composite bridges, and in conjunction with the application of theory, we are committed to researching and obtaining a prefabricated composite web that can prevent the inner lining concrete from cracking. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a prefabricated composite web and a bridge structure thereof for preventing lining concrete from cracking.

[0005] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0006] In a first aspect, the utility model provides a prefabricated composite web for preventing lining concrete from cracking, comprising:

[0007] A corrugated steel web, wherein a plurality of bolt holes are provided on a horizontal plate of the corrugated steel web;

[0008] Prefabricated lining concrete is provided with a corrugated side end surface matching and contacting the corrugated steel web, and a plurality of internal threaded sleeves are pre-embedded on the crest side end surface and the trough side end surface of the corrugated side end surface;

[0009] In the assembled state, the corrugated side end surface of the prefabricated lining concrete matches and fits with the corrugated steel web, and an externally threaded bolt is arranged between the bolt holes and the internally threaded sleeves that match each other in pairs for fastening connection.

[0010] Furthermore, the bolt hole adopts a countersunk hole structure, a hexagonal countersunk hole structure is arranged on the top surface of the nut of the bolt, and the diameter of the bolt nut is the same as the diameter of the bolt hole.

[0011] Furthermore, the bolt includes a fully threaded screw and an internally threaded nut, a portion of the screw passes through the bolt hole and is fastened to the internally threaded sleeve, the other portion protrudes from the bolt hole and is fastened with the nut, and a hexagonal countersunk hole structure is provided on both end surfaces of the screw.

[0012] Furthermore, the depth of the internally threaded sleeve is 40% to 60% of the average thickness of the prefabricated lining concrete.

[0013] Furthermore, at the end face of the trough side of the precast lining concrete, the depth length of the internal threaded sleeve is 50% to 70% of the thickness of the precast lining concrete at the end face of the trough side;

[0014] At the end face on the crest side of the precast lining concrete, the depth length of the internal thread sleeve is 40% to 60% of the thickness of the precast lining concrete at the end face on the crest side.

[0015] Furthermore, the folding angle between the horizontal plate and the inclined plate of the corrugated steel web is in the range of 25° to 35°.

[0016] In the second aspect, the utility model also provides a bridge, comprising a prefabricated composite web for preventing cracking of lining concrete as described in any one of the first aspects, and a 5 mm gap is reserved around the prefabricated composite web for preventing cracking of lining concrete and the main structure of the bridge, and the gaps are connected by a γ-type rubber strip with elastic buffering effect.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1) Compared with on-site cast-in-place lining concrete components, prefabricated lining concrete components have improved crack resistance and stress performance, and are particularly suitable for structures with strict requirements on cracks. They also increase component stiffness, reduce component deformation, and improve component durability, fatigue resistance, and seismic resistance. Compared with on-site pouring of lining concrete, prefabricated lining concrete components save a lot of time, improve work efficiency, reduce manpower requirements, and reduce the labor intensity of construction workers.

[0019] 2) The combined web structure is connected by bolts. Compared with other connection methods, bolts are easy to process, removable, can bear loads, are fatigue-resistant, have good plasticity and toughness, and have simple construction technology and easy installation. They are suitable for on-site installation and connection, and can better ensure the construction progress and quality. They have the advantages of connection plasticity, good toughness, and reliable force transmission. They are also easy to install and disassemble, can be reused many times, and have small connection deformation.

[0020] 3) A threaded sleeve is set in the precast lining concrete to facilitate the connection of the corrugated steel web with bolts. It has good mechanical properties, safe and reliable connection, convenient construction and high efficiency.

[0021] 4) "γ"-shaped rubber strips are set around the bridge and the combined web structure as deformation joints. The "γ"-shaped rubber strips as deformation joints use the high elasticity of "γ"-shaped rubber to adapt to the expansion and contraction deformation of the bridge when the temperature changes. The "γ"-shaped rubber expansion strips have excellent elasticity and resistance to compression deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a prefabricated composite web for preventing lining concrete from cracking provided in accordance with an embodiment of the utility model;

[0023] In the figure:

[0024] 1. Corrugated steel web; 2. Lining concrete; 3. Sleeve; 4. Bolt rod; 5. Nut; 6. Horizontal plate; 7. Inclined plate; 8. Wave crest side end face; 9. Wave trough side end face. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0026] like Figure 1 As shown, in an embodiment of the utility model, a prefabricated composite web for preventing lining concrete from cracking is provided, comprising:

[0027] The corrugated steel web 1 has a plurality of bolt holes formed on a horizontal plate 6 of the corrugated steel web 1;

[0028] The prefabricated lining concrete 2 is provided with a corrugated side end surface matching and contacting the corrugated steel web 1, and a plurality of internal threaded sleeves 3 are pre-embedded on the crest side end surface 8 and the trough side end surface 9 of the corrugated side end surface;

[0029] In the assembled state, the corrugated side end surface of the prefabricated lining concrete 2 is matched and fitted with the corrugated steel web 1, and an external thread bolt is arranged between the bolt holes and the internal thread sleeve 3 that are matched in pairs to fasten the connection.

[0030] In this embodiment, the depth of the internal threaded sleeve 3 is 40%-60% of the average thickness of the precast lining concrete 2. The average thickness is generally calculated using the crest side end face 8 and the trough side end face 9 of the precast lining concrete 2.

[0031] In addition, the depth length of the internal threaded sleeve 3 can also be considered separately according to the location, for example:

[0032] At the end face 9 on the trough side of the precast lining concrete 2, the depth length of the internal threaded sleeve 3 is 50% to 70% of the thickness of the precast lining concrete 2 at the end face 9 on the trough side;

[0033] At the wave crest side end face 8 of the precast lining concrete 2 , the depth length of the internal threaded sleeve 3 is 40% to 60% of the thickness of the precast lining concrete 2 at the wave crest side end face 8 .

[0034] The use of sleeve 3 does not require high connection technology, is simple to operate, and has a stable connection with stable and reliable quality. Since sleeve 3 has high strength and a large stress-bearing area at the joint, it has high connection stability, and is prefabricated and is not restricted by climate and site.

[0035] In this embodiment, the precast lining concrete 2 adopts C50 concrete, the average thickness of the precast lining concrete 2 is 50 cm, and the length and width of the precast lining concrete 2 are cast according to actual conditions. The precast lining concrete 2 is cast in the factory first so that the precast lining concrete 2 can complete shrinkage first, thereby preventing the occurrence of shrinkage cracks in the precast lining concrete 2 caused by on-site casting.

[0036] The outer diameter of the internal threaded sleeve 3 is equal to 16.0 cm, the inner diameter is equal to 14.0 cm, the material is chrome-molybdenum steel, the thickness is 2 cm, and the sleeve 3 is internally threaded and tightly connected with the bolt.

[0037] The folding angle between the horizontal plate 6 and the inclined plate 7 of the corrugated steel web 1 is in the range of 25° to 35°. The steel material of the corrugated steel web is Q345 steel, the thickness of the corrugated steel web 1 is 16mm, the bolt hole in the wavelength direction of the corrugated steel web 1 is opened in the middle of the horizontal plate 6, the horizontal plate 6 is 0.43m wide, the inclined plate 7 is 0.43m wide, the inclined plate 7 is 0.37m long in the horizontal direction, the horizontal folding angle is 30.7°, the bending radius is 75mm, and the wave height is 0.22m. The number and position of bolts in the height direction of the corrugated steel web 1 are determined according to actual conditions. The hole reserved for bolts in the horizontal plate 6 on the corrugated steel web 1 is larger than the bolt rod by 41cm. The corrugated steel web 1 can be used as a bottom mold or side mold in the factory to cast the prefabricated lining concrete 2, or it can be transported to the site later to be assembled with the lining concrete 2 to form a steel-concrete composite web.

[0038] In this embodiment, the bolt hole adopts a countersunk hole structure, a hexagonal countersunk hole structure is arranged on the top surface of the bolt nut, and the diameter of the bolt nut is the same as the diameter of the bolt hole.

[0039] In addition, the bolts are mainly used to connect and fasten the corrugated steel web 1 and the inner lining concrete 2 structure. It can also adopt other structural forms. Specifically, the bolts include a full-thread screw and an internally threaded nut. A part of the screw passes through the bolt hole and is fastened to the internally threaded sleeve 3, and the other part protrudes from the bolt hole and is fastened with a nut, and a hexagonal countersunk hole structure is provided on both end surfaces of the screw.

[0040] Bolts can be used to easily achieve control of different accuracy levels, from ±25% pulse-type tools to ±-1% hand-tightening sleeves 3; bolts have a large amount of standard data for product and process design and a long history of application; bolts make the construction process and equipment effectiveness inspection process easier; there is a gap between the rod and the hole of the bolt, the processing requirements of the through hole are low, the structure is simple, the assembly and disassembly are convenient, and the application is wide; when disassembling later, only the nut 5 needs to be unscrewed without removing the screw rod, which can avoid damage to the threaded holes on large connected parts.

[0041] The outer diameter of the nut 5 is equal to 16.0 cm, the inner diameter is equal to 14.0 cm, and a hexagonal nut 5 is used with a thickness of 14.8 cm, a hexagonal diagonal diameter of 26.17 cm, a hexagonal opposite side length of 24 cm, and a pitch of 2 cm. The nut 5 can work together with the bolt to connect the corrugated steel web 1 and the prefabricated lining concrete 2.

[0042] The bolts have countersunk heads, high-strength bolts with a performance grade of 8.8 or above, and are made of low-carbon alloy steel or medium-carbon steel and are heat-treated. The bolts are precision-selected A or B-grade refined bolts, and have an outer diameter of 15.8 cm and an inner diameter of 13.8 cm. The length of the bolts is 55 cm, with a length of 15 cm outside the steel-concrete composite web and a length of 40 cm inside. The bolts can work together with an internally threaded sleeve 3 and a nut 5 to better connect the corrugated steel web 1 and the prefabricated lining concrete 2, thereby speeding up work efficiency.

[0043] The utility model also provides a bridge, comprising the above-mentioned prefabricated composite web for preventing the inner lining concrete 2 from cracking, and γ-type rubber strips for elastic buffering are arranged around the prefabricated composite web for preventing the inner lining concrete 2 from cracking and in the gap between the prefabricated composite web and the main structure of the bridge.

[0044] "γ" type rubber has the advantages of easy installation, smooth vehicle driving, waterproof, dustproof, low noise. Light weight and low cost. The "γ" type rubber strip for bridge expansion joints is aging-resistant and is made of wear-resistant rubber. It can withstand repeated loads of vehicles and has a long service life. It can be used to replace old bridges and can also be used for the construction of new bridges. The rubber strip for bridge expansion joints uses the high elasticity of rubber to adapt to the expansion and contraction deformation of the bridge deck when the temperature changes. The rubber strip for bridge expansion joints has the advantages of easy installation, smooth driving, waterproof, dustproof, low noise, light weight and low cost, which has been welcomed and praised by the bridge engineering community. In addition, it has excellent flame retardant properties, low smoke and low toxicity; the product function is stable and the dimensional accuracy is high. The "γ" type rubber expansion joint strip uses the air tightness of rubber and the expansion property of water to effectively prevent the leakage of rainwater. It has the main functions of waterproof and dustproof, as well as protecting the normal function of the bridge expansion joint and the road to avoid damage, in order to prevent debris from entering the gap and affecting the expansion and contraction.

[0045] In actual engineering bridges, sufficient space needs to be reserved for the above-mentioned new steel-concrete composite web and "γ" type rubber strip to facilitate their installation.

[0046] The "γ"-shaped rubber strip serves as a deformation joint between the bridge and the combined web structure. The gap between the bridge and the combined web structure is 5mm to 1cm. A "γ"-shaped rubber strip is arranged in the middle, and "γ"-shaped rubber strips are required to be arranged around the combined web structure. The "γ"-shaped rubber strip is a highly elastic material. The "γ"-shaped rubber strip can adapt to the expansion and contraction deformation of the bridge when the temperature changes. Moreover, the "γ"-shaped rubber strip expands when it comes into contact with water, which effectively prevents rainwater leakage. It has the main function of waterproofing and dustproofing, as well as protecting the normal functions of the bridge expansion joint and the road to prevent damage, and prevent debris from entering the gap to affect expansion and contraction.

[0047] In addition, the corrugated steel web required for actual engineering can be used as the bottom form or side form of the lining concrete 2 component. In the lining concrete 2, a threaded sleeve 3 needs to be placed in the middle position of the horizontal plate 6 of the corrugated steel web 1 according to actual conditions. The size of the sleeve 3 is adapted to the bolt. It should be noted that when making prefabricated lining concrete 2 components, it is necessary to place them for a period of time to allow the lining concrete 2 to complete shrinkage, and then transport the prefabricated lining concrete 2 and the corrugated steel web 1 to the site for assembly so that the two are connected as a whole.

[0048] When the combined web structure is connected to the bridge, deformation joints with a width of 5mm to 1cm are arranged on all sides, and highly elastic "γ"-shaped rubber strips are selected for the deformation joints so that they can meet the creep deformation in the later stage. In addition, the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0049] In this embodiment, the use of prefabricated lining concrete 2 components improves the crack resistance of the components and the stress performance of the components compared to the on-site casting of lining concrete 2 components. It is particularly suitable for structures with strict requirements on cracks, and improves the rigidity of the components, reduces the deformation of the components, improves the durability, fatigue resistance and seismic resistance of the components, and can make full use of high-strength materials to replace ordinary materials. Compared with the casting of lining concrete 2 on site, it saves a lot of time, and the next stage can be carried out without waiting for the on-site concrete to solidify, which reduces a part of the process. After the production workshop is completed, it is directly transported to the site for assembly, which speeds up the construction progress and improves the work efficiency. The prefabricated lining concrete 2 components are of good quality, the components are not affected by weather changes, can be directly produced in the factory, and are more reliable in terms of quality; energy-saving and environmental protection, the lining concrete 2 does not need to be cast on site, which reduces the material loss during the construction process, and reduces the construction waste at the construction site; saving manpower, the lining concrete 2 components are directly produced by the factory, which reduces the manpower demand and reduces the labor intensity of the construction personnel.

[0050] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A prefabricated composite web for preventing lining concrete from cracking, characterized in that: include: A corrugated steel web, wherein a plurality of bolt holes are provided on a horizontal plate of the corrugated steel web; Prefabricated lining concrete is provided with a corrugated side end surface matching and contacting the corrugated steel web, and a plurality of internal threaded sleeves are pre-embedded on the crest side end surface and the trough side end surface of the corrugated side end surface; In the assembled state, the corrugated side end surface of the prefabricated lining concrete matches and fits with the corrugated steel web, and an externally threaded bolt is arranged between the bolt holes and the internally threaded sleeves that match each other in pairs for fastening connection.

2. The prefabricated composite web for preventing lining concrete cracking according to claim 1, characterized in that: The bolt hole adopts a countersunk hole structure, and a hexagonal countersunk hole structure is arranged on the top surface of the nut of the bolt, and the diameter of the bolt nut is the same as the diameter of the bolt hole.

3. The prefabricated composite web for preventing lining concrete cracking according to claim 1, characterized in that: The bolt includes a full-thread screw and an internally threaded nut. A portion of the screw passes through the bolt hole and is fastened to the internally threaded sleeve, while the other portion protrudes from the bolt hole and is fastened with the nut. A hexagonal countersunk hole structure is provided on both end surfaces of the screw.

4. The prefabricated composite web for preventing lining concrete cracking according to claim 1, characterized in that: The depth of the internal threaded sleeve is 40%-60% of the average thickness of the prefabricated lining concrete.

5. The prefabricated composite web for preventing lining concrete cracking according to claim 1, characterized in that: At the end face of the trough side of the precast lining concrete, the depth length of the internal threaded sleeve is 50% to 70% of the thickness of the precast lining concrete at the end face of the trough side; At the end face on the crest side of the precast lining concrete, the depth length of the internal thread sleeve is 40% to 60% of the thickness of the precast lining concrete at the end face on the crest side.

6. The prefabricated composite web for preventing lining concrete cracking according to claim 1, characterized in that: The folding angle between the horizontal plate and the inclined plate of the corrugated steel web is in the range of 25° to 35°.

7. A bridge, characterized in that: It comprises a prefabricated composite web for preventing the inner lining concrete from cracking as described in claims 1 to 6, and a 5mm gap is reserved around the prefabricated composite web for preventing the inner lining concrete from cracking and the main structure of the bridge, and the gaps are connected by γ-type rubber strips with elastic buffering effect.

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