Ultra-high performance concrete bridge deck and production method thereof

Abstract

The invention discloses an ultra-high performance concrete bridge deck and a production method thereof.The ultra-high performance concrete bridge deck comprises a pouring frame which comprises an annular edge covering assembly, a steel bar assembly fixedly arranged in the edge covering assembly and a plurality of prestressed steel bars, the prestressed steel bars are arranged at intervals and extend from one side of the edge covering assembly to the other opposite side, and the interval arrangement direction and the extending direction are not parallel; and the ultra-high performance concrete is poured in the edge covering assembly, and the steel bar assembly and the prestressed steel bars are embedded in the ultra-high performance concrete. The prestressed concrete bridge deck slab has the advantages that the prestressed steel bars can prevent the concrete bridge deck slab from cracking in advance after bearing loads, the bridge deck slab with the thinner thickness (for example, the thickness can be 8 cm) can meet the strength requirement, materials are reduced, the weight is reduced, the cost is reduced, the transportation expense for turnover use of the bridge deck slab is reduced, and the safety performance of erection construction of the bridge deck slab is improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of bridge engineering, temporary engineering, and subway station engineering, and particularly relates to a precast ultra-high performance concrete bridge deck and a production method thereof. Background Art

[0002] The bridge deck is a load-bearing structure in the upper part of a bridge that directly bears the pressure of pedestrians, vehicles, and goods. As a key component for bearing and dispersing traffic loads, the bridge deck plays a crucial role in the bridge structure. The bridge deck is mainly applied to temporary trestle projects across rivers, across rivers, and across valleys. Trestles are usually used to meet the passage of construction machinery, materials, and construction personnel, and the bridge deck is an important component in direct contact with the passage of vehicles and construction machinery. Therefore, the design and construction of the bridge deck must be able to withstand various loads, and at the same time, the bridge deck also needs to have excellent mechanical properties, anti-corrosion properties, and durability.

[0003] In the construction of current trestle projects, the types of bridge decks widely used are: steel bridge decks, ordinary concrete bridge decks, and ultra-high performance concrete bridge decks.

[0004] Construction trestles are usually applied in the construction of cross-sea and cross-river bridges. In the face of the rich chloride ion environment at sea, traditional steel bridge decks are severely oxidized and corroded, with large material losses, high turnover and maintenance costs, and are prone to a short service life and relatively low construction economic benefits.

[0005] Ordinary concrete bridge decks also have relatively obvious defects. The self-weight of the concrete bridge deck is relatively large, which increases the overall load of the bridge and may require a stronger support structure to bear. Second, it is not conducive to the on-site installation and removal of the concrete bridge deck, and the corners are prone to damage, with a low construction safety factor. Third, it results in too high costs for the transportation and turnover of the concrete bridge deck.

[0006] (UHPC) Ultra-high performance concrete bridge decks have relatively strong corrosion resistance and strength, and their working performance can exceed the above two. However, ultra-high performance concrete bridge decks also face problems such as a relatively thick thickness, a relatively large self-weight (the smallest thickness on the existing market is 10 cm, and the weight is 4.5 tons), and relatively high raw material costs, which thus greatly reduce the economic benefits.

[0007] Therefore, in the construction of trestle projects, how to optimize the structure of ultra-high performance concrete bridge decks to solve the above technical defects has become a very urgent task at present. Summary of the Invention

[0008] The present invention provides an ultra-high performance concrete bridge deck and a production method thereof, which overcome the deficiencies in the background art.

[0009] One of the technical solutions adopted by the present invention to solve its technical problems is: a super high performance concrete bridge deck, comprising:

[0010] A casting frame, including an annular edge wrapping component, a steel bar component arranged within the edge wrapping component, and a plurality of prestressed steel bars. The plurality of prestressed steel bars are arranged at intervals and extend from one side of the edge wrapping component to the opposite side, and the direction of the interval arrangement and the extending direction are not parallel; and

[0011] Super high performance concrete, which is cast within the edge wrapping component and the steel bar component and the prestressed steel bars are embedded within the super high performance concrete.

[0012] In one embodiment: the casting frame includes at least two layers of prestressed steel bar groups, each layer of prestressed steel bar group includes a plurality of the above-mentioned prestressed steel bars, and at least two layers of prestressed steel bar groups are arranged at intervals along the thickness direction of the concrete bridge deck.

[0013] In one embodiment: for the at least two layers of prestressed steel bar groups, the plurality of prestressed steel bars in the upper and lower adjacent layers of prestressed steel bar groups are arranged in a staggered manner in the interval arrangement direction.

[0014] In one embodiment: holes corresponding to the prestressed steel bars are provided on both one side and the other side of the edge wrapping component, and the ends of the prestressed steel bars extend into the holes.

[0015] In one embodiment: the steel bar component includes a steel bar mesh, the steel bar mesh includes transverse steel bars and longitudinal steel bars, the transverse steel bars and the longitudinal steel bars are connected together and form a grid structure; the prestressed steel bars are arranged longitudinally, and the prestressed steel bars are arranged at intervals between the two longitudinal steel bars;

[0016] The steel bar component is provided with at least two steel bar meshes, and at least two steel bar meshes are arranged at intervals along the thickness direction of the concrete bridge deck; the prestressed steel bars are located between the two steel bar meshes.

[0017] In one embodiment: a first support member is provided between the upper and lower adjacent steel bar meshes.

[0018] In one embodiment: further comprising:

[0019] A connecting portion for splicing at least two concrete bridge decks, including a buckle and a second support member. The buckle is fixedly arranged on the outer side wall of the edge wrapping component, and the second support member is fixedly connected within the included angle between the buckle and the outer side wall of the edge wrapping component, and the second support member fixedly connects the buckle and the edge wrapping component.

[0020] In one embodiment: further comprising:

[0021] A transfer portion for hoisting and transferring the concrete bridge deck, including a sleeve and a first fixing steel bar. The sleeve is penetrated through the concrete bridge deck, and the sleeve is fixedly connected to the steel bar component through the first fixing steel bar.

[0022] In one embodiment, it further includes:

[0023] An installation part for assembling an external device, which is arranged on the side of the concrete bridge deck and includes an assembly hole and a second fixed steel bar. The opening direction of the assembly hole is along the thickness direction of the concrete bridge deck, and the assembly hole is fixedly connected to the steel bar assembly through the second fixed steel bar.

[0024] The second technical solution adopted by the present invention to solve its technical problems is: a production method of an ultra-high performance concrete bridge deck, including:

[0025] Step 1: Assemble a casting frame. The casting frame is arranged on a pedestal. One side and the other side of the edge wrapping component of the casting frame are provided with holes corresponding to prestressed steel bars one by one. The prestressed steel bars pass through the casting frame through the holes, and the prestressed steel bars are tensioned.

[0026] Step 2: Pour ultra-high performance concrete into the edge wrapping component. The ultra-high performance concrete buries the parts of the steel bar assembly and the prestressed steel bars located inside the edge wrapping component therein, and the ultra-high performance concrete is leveled.

[0027] Step 3: After the ultra-high performance concrete solidifies, release the prestressed steel bars, and cut off the parts of the prestressed steel bars exposed outside the edge wrapping component.

[0028] In one embodiment: In this step 1, a bottom mold is arranged on the pedestal, and the bottom mold and the casting frame cooperate to form a mold for casting ultra-high performance concrete; in this step 2, after the prestressed steel bars are tensioned in place, ultra-high performance concrete is poured, vibration is carried out during the pouring process, and the pouring surface is leveled after the pouring is completed; in this step 3, after cutting, the ultra-high performance concrete is filled in the holes.

[0029] In one embodiment: In this step 3, the prestressed steel bars are released in a multiple-step and gradual release manner; the release sequence of multiple prestressed steel bars adopts a sequence of first releasing the middle one and then gradually releasing each one from the middle to the outside.

[0030] In one embodiment: In this step 1, the edge wrapping component of the casting frame has a rectangular structure and includes two transverse edge wrappings and two longitudinal edge wrappings. Holes are processed on the transverse edge wrappings, one longitudinal edge wrapping is fixedly connected to the first ends of the two transverse edge wrappings to form a semi-frame, the steel bar assembly is fixedly connected inside the semi-frame, the other longitudinal edge wrapping is fixedly connected to the second ends of the two transverse edge wrappings and the steel core assembly, and the prestressed steel bars pass through the casting frame through the holes, and the prestressed steel bars are tensioned.

[0031] Compared with the background technology, this technical solution has the following advantages:

[0032] Prestressed steel bars can prevent concrete bridge decks from cracking prematurely after bearing loads, allowing thinner bridge decks (such as as low as 8cm) to meet strength requirements. Thinner thickness reduces material usage, reduces weight, reduces costs, reduces freight costs for bridge deck turnover, and improves the safety performance of bridge deck construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Figure 1 This is a schematic diagram of the structure of an ultra-high performance concrete bridge deck according to Example 1 of the present invention;

[0035] Figure 2 It is a schematic diagram of the partial structure of the casting frame of Example 1 of the present invention;

[0036] Figure 3 For along Figure 2 Cross-sectional view of line EE

[0037] Figure 4 for Figure 2 A partial enlarged view of the middle A;

[0038] Figure 5 for Figure 2 A partial enlarged view of point B in the middle;

[0039] Figure 6 for Figure 2 A partial enlarged view of point C in the middle;

[0040] Figure 7 for Figure 2 A partial enlarged view of point D in the middle;

[0041] Figure 8 This is a schematic diagram of the structure of the transverse hemming of Embodiment 1 of the present invention;

[0042] Figure 9 This is a schematic diagram of the structure of the longitudinal hemming of Embodiment 1 of the present invention;

[0043] Figure 10 This is a schematic structural diagram of the first supporting member of Example 1 of the present invention;

[0044] Figure 11 This is a schematic diagram of the structure of the buckle of Example 1 of the present invention;

[0045] Figure 12 This is a schematic structural diagram of the second supporting member of Example 1 of the present invention.

[0046] Description of labels:

[0047] Steel bar assembly 1, steel bar mesh 11, first support 12, first steel bar 111, second steel bar 112, third steel bar 113, fourth steel bar 114;

[0048] Prestressed steel bar 2;

[0049] Ultra-high performance concrete 3;

[0050] Edge wrapping assembly 4, longitudinal edge wrapping 41, transverse edge wrapping 42, holes 43;

[0051] Transfer part 5, sleeve 51, first fixed steel bar 52;

[0052] Installation part 6, assembly hole 61, second fixed steel bar 62;

[0053] Connection part 7, buckle 71, second support 72. Detailed implementation

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0056] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a wall-mounted connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0057] Embodiment 1

[0058] Reference Figures 1-12, this embodiment provides an ultra-high performance concrete bridge deck, which includes a casting frame and ultra-high performance concrete 3. The casting frame includes an annular edge wrapping component 4, a steel bar component 1 arranged inside the edge wrapping component 4, and several prestressed steel bars 2. The steel bar component 1 is fixedly arranged inside the edge wrapping component 4. The several prestressed steel bars 2 are arranged at intervals along the width direction of the bridge deck and extend along the length direction of the bridge deck. The ultra-high performance concrete 3 is cast inside the edge wrapping component 4, and the steel bar component 1 and the prestressed steel bars 2 are fixedly embedded inside the ultra-high performance concrete 3. Among them: The full name of the ultra-high performance concrete is Ultra-High Performance Concrete, abbreviated as UHPC. It is a new type of high-strength, high-durability, and high-toughness concrete material. Specifically: The unique rheology and self-compacting property of UHPC enable it to have good mold filling performance and can produce precast components with complex shapes and high precision; The mechanical properties such as the compressive strength and flexural strength of the UHPC concrete material are significantly better than those of ordinary concrete, and it also has better durability and corrosion resistance, and can maintain a long service life even in harsh environments; UHPC has extremely high fire resistance and impact resistance and can still maintain a certain load-bearing capacity after encountering fire or impact; The steel bar component 1 can increase the load-bearing capacity of the ultra-high performance concrete bridge deck; The prestressed steel bars 2 can prevent the concrete bridge deck from cracking prematurely after bearing loads, reduce the span-depth ratio and its own weight of the bridge deck under the same load-bearing capacity, block the occurrence and development of cracks in the bridge deck, increase the load-bearing capacity of the bridge deck under the same cross-sectional form, improve the seismic performance of the bridge deck, and at the same time can also limit the occurrence and development of cracks in the bridge deck; In summary, a bridge deck with a thinner thickness (such as it can be as low as 8 cm) can meet the strength requirements. A thinner thickness can reduce the amount of materials used, reduce the weight, reduce the cost, reduce the transportation cost of the bridge deck, and reduce the installation engineering difficulty of the bridge deck.

[0059] The casting frame includes two layers of prestressed steel bar groups. Each layer of prestressed steel bar group includes several of the above-mentioned prestressed steel bars 2. The prestressed steel bars 2 in the same layer are arranged at equal intervals left and right. The two layers of prestressed steel bar groups are arranged at intervals along the thickness direction of the bridge deck. The several prestressed steel bars 2 of the upper and lower adjacent layers of prestressed steel bar groups are arranged in a staggered manner in the interval arrangement direction. Refer to Figure 3 , the prestressed steel bars 2 on the right side in the figure are the upper-layer prestressed steel bars, and the prestressed steel bars 2 on the left side are the lower-layer prestressed steel bars. The number of the upper-layer and lower-layer prestressed steel bars 2 is the same. The position of the upper-layer prestressed steel bars 2 corresponds to the interval gaps between the positions of the two lower-layer prestressed steel bars 2. The above-mentioned staggered arrangement can further reduce the thickness of the bridge deck, improve the crack resistance and load-bearing capacity of the bridge deck, but it is not limited to the staggered arrangement, and alignment can also be made according to needs. In this embodiment, the example of setting two layers of prestressed steel bar groups is used for illustration, but it is not limited to this, and one layer or three layers or four layers, etc. of prestressed steel bar groups can also be set according to needs.

[0060] The steel bar assembly 1 at least includes a steel bar mesh 11 that can improve the crack resistance and bearing capacity of the bridge deck. The steel bar mesh 11 is arranged along the length and width directions of the concrete bridge deck (also along the ultra-high performance concrete 3). The steel bar mesh 11 includes transverse steel bars and longitudinal steel bars. The transverse steel bars and longitudinal steel bars are welded together to form a grid structure. According to needs, welding can also be replaced by tying. In the transverse direction of the steel bar mesh 11, there is a middle area and two side areas. There is a spaced area between the middle area and the side areas. The longitudinal steel bar in the middle area is the third steel bar 113, the longitudinal steel bar in the spaced area is the second steel bar 112, and the longitudinal steel bar in the side area is the first steel bar 111. The outer diameter of the third steel bar 113 is greater than the outer diameter of the first steel bar 111, and the outer diameter of the first steel bar 111 is greater than the outer diameter of the second steel bar 112. The first steel bar 111, the second steel bar 112, and the third steel bar 113 extend along the length direction of the concrete bridge deck (also along the ultra-high performance concrete 3). The transverse steel bar is the fourth steel bar 114, and the fourth steel bar 114 extends along the width direction of the ultra-high performance concrete 3. In this embodiment, taking Figure 2 , Figure 3 as an example for elaboration, they clearly show the arrangement of the first steel bar 111, the second steel bar 112, the third steel bar 113, and the fourth steel bar 114 on the steel bar mesh 11. In order to facilitate the setting of the prestressed steel bar 2, the steel bar arrangements of the two steel bar meshes 11 are not completely the same. For a more detailed structural schematic, reference can be made to Figure 3 . In this embodiment, the steel bar arrangement of the steel bar mesh 11 is not limited only to Figure 3 shown. The steel bar arrangement can also be adjusted according to the actual needs of the construction personnel.

[0061] The steel bar assembly 1 is provided with two steel bar meshes 11, and the two steel bar meshes 11 are arranged at intervals along the thickness direction of the bridge deck. Additionally, it further includes a first support member 12. The first support member 12 is like a support plate, and it is arranged between the upper and lower steel bar meshes 11. It is used to support the steel bar mesh 11 to make a reasonable gap exist between the two steel bar meshes 11, avoid the downward bending of the steel bar mesh 11, and facilitate the pouring of the ultra-high performance concrete 3.

[0062] The edge wrapping component 4 wraps the ultra-high performance concrete 3 to produce the following technical effects: First, it prevents the edges and corners of the bridge deck from being knocked and damaged, protects the edges and corners of the bridge deck from being destroyed, and increases the protection performance of the bridge deck; Second, the edge wrapping component 4 can be directly used as a component of the mold. It cooperates with the tabletop or the bottom mold to form a mold for pouring concrete, so there is no need to frequently replace the pouring mold; Third, it enhances the strength of the bridge deck. The edge wrapping component 4 is arranged on the outer wall surface of the ultra-high performance concrete 3, and the edge wrapping component 4 is connected to the steel bar component 1. Preferably, the steel bar component 1 is welded to the inner wall surface of the edge wrapping component 4. In this embodiment, the edge wrapping component 4 is rectangular and is provided with two longitudinal edge wrappings 41 (the first edge wrapping), two transverse edge wrappings 42 (the second edge wrapping) and holes 43. The edge wrapping is made of section steel. The first edge wrapping 41 and the second edge wrapping 42 are connected end to end and enclose and sleeve on the outer wall surface of the ultra-high performance concrete 3. The hole 43 is arranged on the second edge wrapping 42. The opening position of the hole 43 corresponds to the position where the end of the prestressed steel bar 2 is located, and the opening diameter of the hole 43 is larger than the diameter of the prestressed steel bar 2. The hole 43 is used to cooperate with the tensioning of the prestressed steel bar 2. Considering the relationship between the structural durability benefit of the edge wrapping component 4 and the production cost, in this embodiment, the first edge wrapping 41 is welded by 2 channel steels and has a U-shaped structure with the opening facing inwards, or, to ensure the integrity of the edge wrapping component 4 without affecting its aesthetic appearance, the first edge wrapping 41 is welded by 2 channel steels or consists of 1 channel steel. The prestressed steel bar 2 passes through the pouring frame through the hole and is arranged longitudinally. The prestressed steel bar 2 is arranged at intervals between two longitudinal steel bars. The prestressed steel bar 2 has the mechanical property of high tensile strength and can effectively prevent the concrete bridge deck from cracking, or has various advantages of controlling the crack to a harmless level. In this embodiment, the prestressed steel bar 2 is added, first tensioned, poured after the tensioning is in place, and released after the pouring solidifies, so that the prestressed steel bar 2 arches after the release of tension, then the thickness of the ultra-high performance concrete bridge deck (such as 8 cm) can be reduced, the self-weight of the ultra-high performance concrete bridge deck can be reduced, and its bearing capacity is not lower than that of the existing 10 cm ultra-high performance concrete bridge deck on the market.

[0063] The bridge deck further includes a connecting part 7 for splicing at least two bridge decks, which includes a buckle 71 and a second support 72. The buckle 71 is welded to the outer side wall of the first edge band 41. The second support 72 is arranged in the angle between the buckle 71 and the first edge band 41, and the second support 72 is welded together with the buckle 71 and the first edge band 41. Then, multiple bridge decks can be bolted to each other through the buckles 71 arranged on the edge band assembly 4. The bridge deck further includes a transfer part 5 for hoisting and transferring the bridge deck. The transfer part 5 includes a sleeve 51 and a first fixing steel bar 52. The sleeve 51 is arranged through the concrete bridge deck, and the sleeve 51 is welded to the steel bar assembly 1 by the first fixing steel bar 52 or by binding. The bridge deck further includes an installation part 6 for assembling external devices. The external devices are such as bridge deck guardrails. The installation part 6 is located at the end of the concrete bridge deck. The installation part 6 includes an assembly hole 61 and a second fixing steel bar 62. The opening direction of the assembly hole 61 is along the thickness direction of the concrete bridge deck (which is also along the ultra-high performance concrete 3), and the assembly hole is welded to the steel bar assembly 1 by the second fixing steel bar 62 or by binding.

[0064] A production method of a precast ultra-high performance concrete bridge deck includes:

[0065] Step 1, set a bottom mold on the pedestal. The bottom mold is such as a plastic pattern board. Place the frame formed by the edge band assembly 4 and the steel bar assembly 1 being assembled (such as fixed connection, welding) above the pattern board. The bottom mold and the pouring frame cooperate to form a mold for pouring ultra-high performance concrete. Ultra-high performance concrete pads are also added between the pattern board and the steel bar assembly 1 to ensure sufficient protective layer thickness; the prestressed steel bars 2 pass through the pouring frame through holes, and the prestressed steel bars 2 are tensioned. This tensioning is carried out in a single-symmetric tensioning manner or other tensioning manners.

[0066] The above-mentioned pouring frame assembly: The edge band assembly 4 of the pouring frame has a rectangular structure and includes two transverse edge bands and two longitudinal edge bands. Holes are processed on the transverse edge bands. Weld one longitudinal edge band to the first ends of the two transverse edge bands to form a semi-frame. The steel bar assembly is welded together with one longitudinal edge band and two transverse edge bands to fixedly weld the steel bar assembly inside the semi-frame. Weld the other longitudinal edge band together with the steel bar assembly and two transverse edge bands to form an edge band-steel bar mesh (frame).

[0067] Step 2, after the prestressed steel bars 2 are tensioned in place, pour C120 ultra-high performance concrete (UHPC) 3 into the edge band assembly 4. During the pouring process, vibration is carried out. The ultra-high performance concrete 3 buries the parts of the steel bar assembly and the prestressed steel bars 2 located inside the edge band assembly 4. The side of the bridge deck close to the pattern board is the pattern surface, and the side far from the pattern board is the pouring surface. After pouring, level the pouring surface; after leveling, cover with a plastic film to reduce water loss, and then cover a layer of tarpaulin on the plastic film to ensure that the internal temperature of the bridge deck does not dissipate too quickly.

[0068] Step 3: After pouring, stack and cure in a static state. After the ultra-high performance concrete 3 has solidified to the specified strength (such as final setting), then relax the prestressed steel bars 2. After relaxation, cut the prestressed steel bars for the first time, then remove the formworks such as the profiled steel sheets, and then cut the part of the prestressed steel bars 2 exposed outside the edge component 4 for the second time. The cutting position is flush with the outer peripheral wall of the edge component 4 (if it is flush after the first cut, there is no need for the second cut, or the single cut can also be set after removing the profiled steel sheets). Fill the hole 43 with ultra-high performance concrete. Finally, paint the edge component, and then transfer it to the finished product curing and storage area. After the strength meets the design requirements, transport it to the required construction site. Among them: The relaxation of the prestressed steel bars 2 adopts a multi-step and gradual relaxation method to make the arching effect of the prestressed steel bars 2 better after relaxation. The relaxation sequence of multiple prestressed steel bars 2 adopts the sequence of first the middle one and then gradually from the middle to the outside one by one, and symmetric relaxation from the middle to the outside, so as to improve the arching stability; fill the ultra-high performance concrete at the hole after cutting.

[0069] The prestressed steel bars are tensioned by the pretensioning method, such as one-end single-strand symmetric tensioning or one-end integral tensioning or two-end integral tensioning, and a mechanical jack or a hydraulic jack is used for tensioning.

[0070] For one-end single-strand symmetric tensioning, one end of the prestressed steel bar 2 is set as the fixed end and the other end forms the tensioning end. In this embodiment, using the prestressed steel bar 2 can reduce the tension value of the prestressed steel bars and facilitate the use of a mechanical jack for tensioning. The prestressed steel bar 2 is tensioned by the pretensioning method, with one end fixed and one-end single-strand symmetric tensioning, which means that during the construction of prestressed concrete, one end of the prestressed steel bar 2 is fixed first and the other end is tensioned. "Single-strand symmetric tensioning" means that during the tensioning construction of a single prestressed steel bar 2, a symmetric tensioning sequence is adopted. For example: First, tension the middle prestressed steel bar 2 each time, and then sequentially tension to both sides. In this way, the prestress is evenly distributed during the tensioning process, the structure is in force balance, avoiding excessive local stress causing cracks, avoiding causing bending moments, and avoiding structural deformation. At the same time, such an operation can also more accurately control the magnitude and direction of the prestress, thereby improving the construction accuracy and the quality of the components. Among them, when using one-end single-strand tensioning, the pedestal for casting the bridge deck is the bearing pedestal. Steel plates are respectively arranged at both ends of the pedestal for casting the bridge deck. The steel plates serve as fixed crossbeams, and holes are opened at the corresponding positions of the prestressed steel bars 2. The hole diameter is larger than the diameter of the prestressed steel bars. One end (fixed end) of the prestressed steel bar is fixedly connected to a fixed crossbeam, and the other end (tensioning end) passes through the hole of the other fixed crossbeam and is connected to the jack, and the tensioning is realized by driving the jack.

[0071] For one - end integral tensioning, the pedestal for casting the bridge deck is a load - bearing pedestal frame. Steel plates are respectively arranged at both ends of the pedestal for casting the bridge deck as fixed cross - beams, and a movable cross - beam is arranged directly in front of the steel plate at one end of the pedestal for casting the bridge deck. Openings are made at the corresponding positions of the steel bars, and the diameter of the openings is larger than the diameter of the prestressed steel bars. One end of the prestressed steel bar is fixedly connected to one fixed cross - beam, and the other end passes through the opening of the other fixed cross - beam and is fixedly connected to the movable cross - beam. The jack is connected to the movable cross - beam and drives the movable cross - beam to move to achieve tensioning.

[0072] For two - end integral tensioning, the pedestal for casting the bridge deck is a load - bearing pedestal frame. Steel plates are respectively arranged at both ends of the pedestal for casting the bridge deck as fixed cross - beams, and movable cross - beams are arranged directly in front of the steel plates at both ends of the pedestal for casting the bridge deck. Openings are made at the corresponding positions of the steel bars, and the diameter of the openings is larger than the diameter of the prestressed steel bars. Both ends of the prestressed steel bar (both are tensioning ends) respectively pass through the openings of the two fixed cross - beams and are respectively fixedly connected to the two movable cross - beams. The jack is connected to the movable cross - beam and drives the movable cross - beam to move to achieve tensioning.

[0073] As described above, it is only a preferred embodiment of the present invention. Therefore, the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. An ultra-high performance concrete bridge deck, characterized in that: include: A casting frame, comprising an annular edge-wrapping component, a steel bar component arranged in the edge-wrapping component, and a plurality of prestressed steel bars, wherein the plurality of prestressed steel bars are arranged at intervals and the prestressed steel bars extend from one side of the edge-wrapping component to the other opposite side, and the direction of the interval arrangement and the direction of the extension are not arranged in parallel; and Ultra-high performance concrete is poured into the edging assembly and the steel bar assembly and prestressed steel bars are embedded in the ultra-high performance concrete.

2. The ultra-high performance concrete bridge deck according to claim 1, characterized in that: The casting frame comprises at least two layers of prestressed steel bar groups, each layer of prestressed steel bar groups comprises a plurality of the above-mentioned prestressed steel bars, and at least two layers of prestressed steel bar groups are arranged at intervals along the thickness direction of the concrete bridge deck.

3. The ultra-high performance concrete bridge deck according to claim 2, characterized in that: The at least two layers of prestressed steel bar groups: a plurality of prestressed steel bars of the upper and lower adjacent layers of prestressed steel bar groups are staggeredly arranged in the spacing arrangement direction.

4. The ultra-high performance concrete bridge deck according to claim 1, 2 or 3, characterized in that: One side and the other side of the edge wrapping component are provided with holes corresponding to the prestressed steel bars, and the ends of the prestressed steel bars extend into the holes.

5. The ultra-high performance concrete bridge deck according to claim 1, characterized in that: The steel bar assembly includes a steel mesh, which includes transverse steel bars and longitudinal steel bars, which are connected together to form a grid structure; the prestressed steel bars are arranged in the longitudinal direction, and the prestressed steel bars are arranged between two longitudinal steel bars at intervals; The steel bar assembly is provided with at least two steel bar meshes, and the at least two steel bar meshes are arranged at intervals along the thickness direction of the concrete bridge deck; the prestressed steel bar is located between the two steel bar meshes.

6. The ultra-high performance concrete bridge deck according to claim 5, characterized in that: A first supporting member is arranged between two upper and lower adjacent steel mesh sheets.

7. The ultra-high performance concrete bridge deck according to claim 1, characterized in that: Also includes: A connecting part for splicing at least two concrete bridge decks includes a buckle and a second support member. The buckle is fixed to the outer side wall of the edging component, and the second support member is fixed in the angle between the buckle and the outer side wall of the edging component. The second support member is fixed to the buckle and the edging component.

8. The ultra-high performance concrete bridge deck according to claim 1, characterized in that: Also includes: The transfer part used for hoisting and transferring the concrete bridge deck comprises a sleeve and a first fixed steel bar. The sleeve is penetrated through the concrete bridge deck and the sleeve is fixed to the steel bar assembly through the first fixed steel bar.

9. The ultra-high performance concrete bridge deck according to claim 1, characterized in that: Also includes: The mounting portion for assembling external equipment is arranged on the side of the concrete bridge deck and includes an assembly hole and a second fixing steel bar. The assembly hole is opened along the thickness direction of the concrete bridge deck, and the assembly hole is fixed to the steel bar assembly through the second fixing steel bar.

10. The method for producing an ultra-high performance concrete bridge deck according to claim 1, characterized in that: include: Step 1, assembling a casting frame, the casting frame is arranged on a pedestal, one side and the other side of the edge component of the casting frame are provided with holes corresponding to the prestressed steel bars, the prestressed steel bars pass through the casting frame through the holes, and the prestressed steel bars are tensioned; Step 2, pouring ultra-high performance concrete in the edge-wrapping component, burying the steel bar component and the prestressed steel bar in the ultra-high performance concrete, and smoothing the ultra-high performance concrete; Step 3: After the ultra-high performance concrete solidifies, the prestressed steel bars are tensioned and the portions of the prestressed steel bars exposed outside the edge-wrapping components are cut off.

11. The method for producing an ultra-high performance concrete bridge deck according to claim 10, characterized in that: In step 1, a bottom mold is set on the pedestal, and the bottom mold and the casting frame cooperate to form a mold for casting ultra-high performance concrete; in step 2, after the prestressed steel bars are tensioned in place, ultra-high performance concrete is cast, and vibration is performed during the casting process. After the casting is completed, the casting surface is smoothed; in step 3, the ultra-high performance concrete is filled in the hole after cutting.

12. The method for producing an ultra-high performance concrete bridge deck according to claim 10, characterized in that: In step 3, the prestressed steel bars are tensioned in multiple steps; the order of tensioning the multiple prestressed steel bars is to tension the middle bars first and then one by one from the middle to the outside.

13. The method for producing an ultra-high performance concrete bridge deck according to claim 10, characterized in that: In step 1, the edging component of the casting frame is a rectangular structure and includes two transverse edgings and two longitudinal edgings. Holes are processed on the transverse edgings, and one longitudinal edging is fixedly connected to the first ends of the two transverse edgings to form a half frame. The steel bar component is fixed in the half frame, and the other longitudinal edging is fixedly connected to the second ends of the two transverse edgings and the steel core component. The prestressed steel bars pass through the casting frame through the holes to tension the prestressed steel bars.

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