Ultra-high performance concrete beam

Abstract

The utility model provides an ultra-high performance concrete beam which comprises an embedded framework and ultra-high performance concrete, the ultra-high performance concrete is poured into the embedded framework, and the embedded framework is embedded in the ultra-high performance concrete. The embedded framework comprises a steel bar frame and prestressed steel strands penetrating through the steel bar frame, the steel bar frame comprises first steel bars and a steel bar assembly, the steel bar assembly comprises stirrups and is provided with constraint matching rings, the prestressed steel strands and the first steel bars extend in the X direction, and the steel bar assembly is arranged in the second direction. The second direction is perpendicular to the first direction, and at least part of the prestressed steel strand penetrates through the constraint matching ring. The bearing capacity and durability of the ultra-high-performance concrete beam structure are improved, and the advantages of high environment adaptability and good corrosion resistance of the ultra-high-performance concrete structure are fully exerted.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction engineering, in particular to an ultra-high performance concrete beam. Background Art

[0002] In the technical field of bridge construction engineering, a trestle is usually used to satisfy the passage of construction machinery, materials and construction personnel. At present, the longitudinal beams on the trestle mainly adopt Bailey truss design, and its types include 321 Bailey truss and 421 Bailey truss, etc. As the main load-bearing structure in the trestle, it is necessary to consider whether the materials used have excellent mechanical properties, durability and anti-corrosion properties. Generally speaking, the Bailey truss is welded by channel steel. Although it has the characteristics of simple structure, convenient transportation, rapid erection and easy decomposition, during the use process, serious corrosion often occurs, which in turn leads to a situation where its durability and bearing capacity are seriously insufficient, posing a great potential safety hazard to the built trestle. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an ultra-high performance concrete beam with improved bearing capacity and durability.

[0004] To solve the above technical problem, the utility model provides: an ultra-high performance concrete beam, including an embedded structure and ultra-high performance concrete. The ultra-high performance concrete is poured in the embedded structure and the embedded structure is buried in the ultra-high performance concrete; the embedded structure includes a steel bar framework and prestressed steel strands passing through the steel bar framework. The steel bar framework includes a first steel bar and a steel bar assembly. The steel bar assembly includes stirrups, and the steel bar assembly forms a restraint mating ring. The prestressed steel strands and the first steel bar extend along a first direction, the steel bar assembly is arranged along a second direction, the second direction is perpendicular to the first direction, and at least part of the prestressed steel strands pass through the restraint mating ring.

[0005] In one embodiment: the steel bar assembly has two side ends, the two sides of the side ends expand outwards, at least part of the prestressed steel strands pass through the side ends, and a horseshoe structure is formed at both ends of the ultra-high performance concrete beam after the ultra-high performance concrete is poured.

[0006] In one embodiment: the first steel bar is connected to the steel bar assembly.

[0007] In one embodiment: the steel bar assembly further includes a second steel bar, the second steel bar is connected to the stirrups and the stirrups form the above-mentioned restraint mating ring, and the second steel bar extends along the second direction.

[0008] In one embodiment: the steel bar assembly includes two second steel bars arranged at intervals along a third direction, the third direction is perpendicular to the first direction and the second direction, the stirrup and the two second steel bars are connected together, and the constraint matching ring has a middle area located between the two second steel bars and two side areas located on both sides of the middle area, and the side areas are located outside the two second steel bars; the stirrup has a first straight line segment, two second straight line segments respectively fixed at both ends of the first straight line segment, and two third straight line segments respectively fixed at the ends of the second straight line segment, the two third straight line segments are cross-arranged, and the first straight line segment is fixed at the end of the second steel bar.

[0009] In one embodiment: ends of the two third straight line segments are respectively fixed to the two second steel bars.

[0010] In one embodiment: the prestressed steel strand is passed through a middle region of the constraint fitting ring, and a plurality of first steel bars are passed through the side region.

[0011] In one embodiment: prestressed steel strands are inserted into the middle region and the side regions of the constraint fitting ring, and a plurality of first steel bars are also inserted into the middle region of the constraint fitting ring.

[0012] In one embodiment: the stirrup is formed with the above-mentioned constraint fitting ring, and the stirrup is extended along the second direction.

[0013] In one embodiment: the restraining matching ring of the stirrup is a dumbbell-shaped closed structure with large ends at both ends and a small middle. The dumbbell-shaped closed structure has two head parts and a radial part connected between the two head parts and extending along the second direction. The two head parts constitute the two side ends of the steel bar assembly. The head parts are arranged to expand outward relative to the radial part. At least part of the prestressed steel strands are passed through the head parts. After the ultra-high performance concrete is poured, a horseshoe-shaped structure is formed at the two side ends of the ultra-high performance concrete beam.

[0014] In one embodiment: the head includes a fourth straight line segment extending along a third direction, and a fifth straight line segment formed by vertically extending from the end of the fourth straight line segment, the third direction is perpendicular to the first direction and the second direction, the end of the fifth straight line segment is bent toward another fifth straight line segment to form an inclined sixth straight line segment, and the radial portion includes two seventh straight line segments, and the seventh straight line segment connects the ends of the sixth straight line segments of the two heads.

[0015] In one embodiment: the steel bar assembly further includes a second steel bar, the second steel bar is connected to the stirrups, the second steel bar and the stirrups connected together cooperate to form the above-mentioned constraint fitting ring, and the second steel bar is extended along the second direction.

[0016] In one embodiment: it also includes a protective member, which is arranged on the outer surface of the ultra-high performance concrete, and the outer surface of the protective member is flush with the outer surface of the ultra-high performance concrete.

[0017] In one embodiment: it also includes a mounting hole for cooperating with external construction equipment, and the mounting hole is set in the ultra-high performance concrete.

[0018] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0019] Provide ultra-high performance concrete beams, by setting prestressed steel strands in ultra-high performance concrete, and the steel bar components form a constraint matching ring, forming a strong and closed frame, the prestressed steel strands are passed through the constraint matching ring, so as to improve the bearing capacity and durability of the ultra-high performance concrete beam structure, give full play to the advantages of ultra-high performance concrete structure with strong environmental adaptability and good corrosion resistance, and provide an additional safety guarantee for the production operations of the pier construction project. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an ultra-high performance concrete beam according to Example 1 of the utility model;

[0021] Figure 2 It is a partial side view of an ultra-high performance concrete beam according to Example 1 of the utility model;

[0022] Figure 3 This is a schematic structural diagram of a steel bar assembly according to Embodiment 1 of the present utility model;

[0023] Figure 4 It is a side view of a steel bar assembly according to Embodiment 1 of the present utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the stirrups of Example 1 of the utility model;

[0025] Figure 6 It is a partial schematic diagram of the internal structural connection relationship of the ultra-high performance concrete beam of Example 1 of the utility model.

[0026] Figure 7 This is a schematic diagram of the structure of the stirrups of Example 2 of the utility model. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0028] In the description of the present utility model, 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 drawings. It is 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It 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 utility model can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] Reference Figures 1-6 , this embodiment provides a prestressed ultra-high performance concrete beam, including an embedded structure and ultra-high performance concrete 3. The ultra-high performance concrete 3 is poured in the embedded structure and the embedded structure is fixedly buried in the ultra-high performance concrete 3; the embedded structure includes a steel bar framework 2 and prestressed steel strands 1 passing through the steel bar framework 2. The steel bar framework 2 includes a first steel bar and a steel bar assembly 23. The first steel bar is divided into an N1 steel bar 21 and an N2 steel bar 22. The diameter of the N1 steel bar 21 is greater than that of the N2 steel bar 22. The steel bar assembly 23 is used to connect the first steel bar (N1 steel bar 21, 22) and includes a second steel bar 231 and stirrups 232. The prestressed steel strands 1, N1 steel bar 21, and N2 steel bar 22 are arranged to extend along the X direction. The second steel bar 231 extends along the Y direction. The stirrups 232 are located at the side ends of the ultra-high performance concrete 3 in the Y direction. The second steel bar 231 and the stirrups 232 are connected together and the stirrups 232 form a constraint cooperation ring, forming a strong and closed frame. The prestressed steel strands 1 are passed through the constraint cooperation ring. Both ends of the second steel bar 231 are connected with stirrups 232, so prestressed steel strands 1 are provided at both the upper and lower ends of the prestressed ultra-high performance concrete beam. After the ultra-high performance concrete 3 is poured, horseshoe-shaped structures are formed at both side ends of the prestressed ultra-high performance concrete beam. After the prestressed steel strands 1 are tensioned, they can produce a camber to enhance the bearing capacity of the prestressed ultra-high performance concrete beam. The steel bar framework 2 is used to improve the bearing capacity of the prestressed ultra-high performance concrete beam; the above-mentioned X direction is like the length direction of the prestressed ultra-high performance concrete beam, the Y direction is like the height direction, and the Z direction is like the thickness direction.

[0032] The steel bar assembly 23 includes two second steel bars 231 arranged at intervals along the Z direction. The constraint matching ring of the stirrup 232 has a first straight line segment, two second straight line segments respectively fixed at both ends of the first straight line segment and two third straight line segments respectively fixed at the ends of the second straight line segment. The two third straight line segments are arranged crosswise, the first straight line segment is fixed at the ends of the second steel bars 231, and the intersection of the two third straight line segments is welded or tied or simply overlapped. The ends of the two crosswise arranged third straight line segments are respectively fixed at the two second steel bars 231. The stirrup 232 and the two second steel bars 231 are connected together, and the constraint matching ring has a middle area 2321 located between the two second steel bars 231 and two side areas 2322 located at both sides of the middle area 2321. The side area 2322 is located outside the two second steel bars 231 and between the second straight line segment and the second steel bars 231. A triangular enclosed area 2323 is formed between the two crosswise arranged third straight line segments and the second steel bars. The second steel bar 231 and the stirrup 232 are connected together to form a constrained fit. The connection can be welded, tied or overlapped as needed. The connection is conducive to the N1 steel bar 21 and the N2 steel bar 22 being welded inside the steel bar assembly 23, which plays a binding and restricting role for the longitudinally placed N1 steel bar 21 and N2 steel bar 22. The steel bar assembly 23 in this embodiment takes two second steel bars 231 as an example, but it is not limited to this. There can be more than two as needed. In this case, the two second steel bars are the two second steel bars located on the outermost side. The second steel bar 231 and the stirrup 232 are preferably 8mm round steel.

[0033] Both ends of the second steel bar 231 are connected with stirrups 232, wherein:

[0034] In the stirrups 232 at the upper end: the prestressed steel strand 1 is inserted into the middle area 2321 of the constraint fitting ring, and a plurality of first steel bars, such as N1 steel bars 21, are inserted into the side area 2322; if two prestressed steel strands 1 are provided, the two prestressed steel strands 1 are spaced apart along the Y direction, and if three N1 steel bars 21 are provided in each side area 2322, the three N1 steel bars 21 are spaced apart along the Y direction, one prestressed steel strand 1 is adjacent to the first straight line segment, one N1 steel bar 21 in each side area 2322 is connected to the first straight line segment, and the N1 steel bar 21 in each side area 2322 is connected to the second straight line segment, and the connection is such as welding, tying or overlapping; the N1 steel bar 21 serves as the main force-bearing steel bar to assist the prestressed steel strand 1 at the upper end of the ultra-high performance concrete 3 in resisting the downward bending moment.

[0035] In the stirrups 232 at the lower end: Prestressed steel strands 1 are threaded through both the middle region 2321 and the side region 2322 of the restraint mating ring. Multiple first reinforcing bars, such as N2 reinforcing bars 22, are also threaded through the middle region 2321 of the restraint mating ring. Two prestressed steel strands 1 are provided in each of the middle region 2321 and the side region 2322. The two prestressed steel strands 1 are spaced apart along the Y direction. The prestressed steel strands 1 in the middle region 2321 and the side region 2322 are arranged at the same height. In the middle region 2321, the first reinforcing bars are arranged in two rows, such as four N2 reinforcing bars 22. The two rows of N2 reinforcing bars 22 are respectively connected to the two second reinforcing bars 231 at intervals along the Y direction. The connection can be welding, binding, or lapping.

[0036] In the enclosed region 2323, a first reinforcing bar is provided, such as an N2 reinforcing bar 22 of a single first reinforcing bar. The N2 reinforcing bar 22 is connected at the intersection of the second reinforcing bar and the third straight segment.

[0037] The first reinforcing bar is divided into a first part located between the two second reinforcing bars and a second part located outside the two second reinforcing bars. The first part of the first reinforcing bar is an N2 reinforcing bar 22, and the second part of the first reinforcing bar is an N1 reinforcing bar 21. The N2 reinforcing bar 22 and the second reinforcing bar 231 are connected together. The connection can be welding or binding. The N2 reinforcing bar 22 and the second reinforcing bar 231 are connected to form a steel bar mesh. The N2 reinforcing bar 22 serves as a secondary load-bearing reinforcing bar, assisting the N1 reinforcing bar 21 and the prestressed steel strands 1 to resist the downward bending moment. At the same time, it also serves as a spacer bar to make the steel bar assembly 23 into a regular steel bar cage. The N1 reinforcing bars 21 and the N2 reinforcing bars 22 are equally spaced and parallel to each other. In this embodiment, the N1 reinforcing bar 21 is preferably a 14mm deformed bar, and the N2 reinforcing bar 22 is preferably an 8mm round bar.

[0038] In this embodiment, the steel bar framework 2 includes a plurality of steel bar components 23. The steel bar components 23 are arranged at equal intervals along the X direction, and the interval distance between two adjacent steel bar components 23 is preferably 150 mm. In this embodiment, the stirrup 232 is shaped as a special-shaped steel bar formed by enclosing a steel bar strip to form a closed polygon and the head and tail are cross-connected. Considering the relationship between the production cost and the use effect of the ultra-high performance concrete beam, the preferred connection relationship between the steel bars is welding. The connection methods between the second steel bar 231 and the stirrup 232, between the N1 steel bar 21 and the stirrup 232, and between the N2 steel bar 22 and the second steel bar 231 and the stirrup 232 are all welding. Specifically, one second steel bar 231 welded to one stirrup 232 corresponds to 3 welding points. As a common replacement in this embodiment, it can be understood that at least 1 welding point is provided between the second steel bar 231 and the stirrup 232. Further, the N1 steel bar 21 is welded to the stirrup 232, and the N2 steel bar 22 is welded to the second steel bar 231. Specifically, the N1 steel bar 21 is welded to the inner side of the stirrup 232, and the N2 steel bar 22 is welded to the area between 2 second steel bars 231. In this embodiment, the N2 steel bar 22 placed at the top of the steel bar framework 2 is welded to the enclosed area 2323 formed between the stirrup 232 and the second steel bar 231.

[0039] Due to the presence of the stirrup 232, the cross-sectional area at the two ends of the ultra-high performance concrete 3 is larger than the cross-sectional area in the middle of the ultra-high performance concrete 3. In this embodiment, the upper and lower ends of the ultra-high performance concrete 3 are designed as a horseshoe shape, with the upper and lower ends being wider and the middle being narrower. This reasonably optimizes the external shape of the ultra-high performance concrete 3 while also saving the use of concrete materials. Further, it enables the ultra-high performance concrete beam to be stable and not prone to tipping during storage, transportation, and placement.

[0040] The ultra-high performance concrete beam further includes a protection member 4 for preventing the ultra-high performance concrete beam from being damaged by collision. The protection member 4 is provided on the outer surface of the ultra-high performance concrete 3. The protection member 4 is fixedly connected to the outer surfaces of the two ends of the ultra-high performance concrete 3, and the outer surface of the protection member 4 is flush with the outer surfaces of the two ends of the ultra-high performance concrete 3. In this example, the protection member 4 is preferably an angle steel. The angle steel provided on the outer surface of the ultra-high performance concrete beam can be used to prevent the ultra-high performance concrete beam from colliding with other objects during transportation, hoisting, and turnover, and avoid the occurrence of damage to its corners.

[0041] The ultra-high performance concrete beam further includes installation holes 5 for cooperating with external construction equipment, such as construction flower racks for construction. The installation holes 5 are provided on the ultra-high performance concrete 3, and the installation holes 5 are distributed at positions close to the middle of the ultra-high performance concrete 3 between the stirrups 232. Each position of the installation holes 5 on the ultra-high performance concrete 3 includes at least one hole. The shape of the hole is circular, rectangular, or other polygons. The installation holes 5 are arranged at intervals along the length direction of the ultra-high performance concrete 3. The installation holes 5 penetrate through the ultra-high performance concrete 3, and the opening direction of the installation holes 5 is perpendicular to the length direction of the ultra-high performance concrete 3.

[0042] The prestressed steel strand 1 is a stranded steel cable or steel bar composed of 2, 3, 7, or 19 high-strength steel wires. The stranded steel cable or steel bar is stress-relieved (stabilized), suitable for prestressed concrete and similar applications. The main characteristics of the prestressed steel strand 1 are high strength and good relaxation performance, and it is relatively straight when unfolded. The common tensile strength grade is 1860 MPa, and there are also strength grades such as 1720, 1770, and 1960 MPa. The yield strength of this kind of steel is also very high. In this embodiment, the prestressed steel strand 1 is arranged along the length direction of the ultra-high performance concrete 3. In this embodiment, the prestressed steel strand 1 uses a 15.2 mm steel strand and adopts a high-strength low-relaxation steel strand. The prestressed steel strand 1 can improve the durability of the ultra-high performance concrete beam structure. Moreover, based on the shrinkage and camber of the prestressed steel strand 1, the bearing capacity of the ultra-high performance concrete beam structure is enhanced, and the bearing capacity required for cracking is delayed. The prestressed steel strand 1 has the mechanical properties of high tensile strength and can effectively prevent concrete from cracking or control the cracks to a harmless level with various advantages.

[0043] Specifically, in this embodiment, the prestressed steel strand 1 is tensioned by the pretensioning method, with one end (fixed end) fixed and the other end (tensioning end) tensioned symmetrically one by one. During the concrete construction process, the prestressed steel bars or tendons are first fixed at one end and tensioned at the other end. "Tensioning symmetrically one by one" means that when tensioning the single prestressed tendon, a symmetric time sequence is adopted. For example, the middle steel bar is tensioned first each time, and then the tensioning is carried out successively to both sides. In this way, the forces during the tensioning process will be evenly distributed, the structure will be in force balance, cracks caused by excessive local stress can be avoided, the bending moment caused by uneven gravitational force can also be reduced, the prestress can be evenly distributed, and the problem of structural deformation caused by uneven prestress distribution can be prevented, enabling the staff to more accurately control the magnitude and direction of the prestress, thereby improving the construction accuracy and component quality. The production process of this embodiment is as follows: Step 1, assemble the steel bar framework 2, pass the prestressed steel strand 1 through the steel bar framework 2 and tension the prestressed steel strand 1; Step 2, pour the ultra-high performance concrete; Step 3, after the ultra-high performance concrete solidifies, release the prestressed steel strand 1, such as gradually releasing it, and cut off the part of the prestressed steel strand 1 outside the concrete after the release is completed. According to needs, it is also possible to adopt: fixing one end and tensioning the whole at the other end, or tensioning at both ends; using a mechanical jack or a hydraulic jack for tensioning.

[0044] Ultra-High Performance Concrete, abbreviated as UHPC, with the full name Ultra-High Performance Concrete, is a new type of high-strength, high-durability, and high-toughness concrete material. UHPC uses optimized cement aggregates, ultra-fine cement, and silica fume, and some also use special materials such as high elastic modulus fibers for strengthening to achieve more excellent engineering properties. Compared with ordinary concrete, the unique rheology and self-compacting properties of UHPC endow it with good mold filling performance, enabling the production of precast components with complex shapes and high precision. In addition, the mechanical properties such as compressive strength and flexural strength of UHPC concrete materials 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. Moreover, UHPC has extremely high fire resistance and impact resistance, and can still maintain a certain load-bearing capacity after encountering fire or impact. In this embodiment, the ultra-high performance concrete beam has excellent mechanical properties, durability, and anti-corrosion properties. It has strong load-bearing capacity and good anti-corrosion performance. Moreover, the production cost of the ultra-high performance concrete beam is controllable, the structure is simple, it is convenient for turnover and transportation, and it has strong environmental adaptability. It has excellent pouring and forming performance. It saves more material usage than other concrete materials, can reduce the self-weight of components, reduce carbon dioxide emissions, and the excellent durability reduces component maintenance and repair, making it more green and energy-saving. In some trestle construction projects, ultra-high performance concrete beams can be fully used to replace Bailey sheets to improve the problems exposed by Bailey sheets in trestle construction projects, and further ensure the safety production operation of construction projects and improve construction efficiency. Compared with Bailey sheets, the ultra-high performance concrete beam in this embodiment reduces the weight of its own components, reduces the large use of steel, and reduces carbon dioxide emissions, achieving energy conservation and emission reduction.

[0045] A production method of a precast ultra-high performance concrete beam includes:

[0046] Step 1, set a bottom mold on the pedestal. The bottom mold is like a plastic pattern board. Install a steel bar framework 2 on the bottom mold, and install a side mold. The side mold and the bottom mold cooperate to form a pouring mold. The steel bar framework 2 is located inside the pouring mold. Pass prestressed steel strands 1 and tension the prestressed steel strands 1. The tensioning can adopt a single-strand symmetric tensioning method or other tensioning methods;

[0047] Step 2, after the prestressed steel strands 1 are tensioned in place, pour ultra-high performance concrete into the pouring mold, and vibrate during the pouring process. The ultra-high performance concrete fixes and buries the internal structure therein;

[0048] Step 3, curing after pouring, after the ultra-high performance concrete solidifies to the specified strength (such as final setting), dismantle the casting mold, and then release the prestressed steel strand 1, and cut off the prestressed steel strand 1 after the release. Among them: the prestressed steel strand 1 is released in a multiple step-by-step manner so that the prestressed steel strand 1 has a good arching effect after release. The order of releasing multiple prestressed steel strands 1 is to release them one by one from the middle first and then from the middle to the outside, and release them symmetrically from the middle to the outside, which can improve the arching stability; after cutting, fill the hole with ultra-high performance concrete. After cutting, move the concrete beam to the storage position, seal the ends, and continue to cure the concrete.

[0049] Example 2

[0050] refer to Figure 7 , which is different from the first embodiment in that: the stirrup 232 is formed with a constraint matching ring, the stirrup is extended along the second direction of 232, the second direction and the first direction are arranged perpendicularly, the constraint matching ring of the stirrup 232 is a dumbbell-shaped closed structure with large ends at both ends and a small middle, the dumbbell-shaped closed structure has two heads 2324 and a radial portion 2325 connecting the two heads 2324, at least part of the prestressed steel strands are inserted in the head 2324, and the radial portion 2325 is extended along the second direction. The two heads constitute the two side ends of the steel bar assembly, the heads are arranged outward relative to the radial portion, and the horseshoe structure is formed at the two side ends of the ultra-high performance concrete beam after the ultra-high performance concrete is poured. The head 2324 includes a fourth straight line segment extending along the third direction, a fifth straight line segment formed by the vertical extension of the end of the fourth straight line segment, the end of the fifth straight line segment is bent toward another fifth straight line segment to form an inclinedly arranged sixth straight line segment, and the radial portion includes two seventh straight line segments, and the seventh straight line segment is connected between the ends of the sixth straight line segments of the two heads. The dumbbell-shaped closed structure is as follows: (1) a single steel bar is bent, and the ends are welded, tied or overlapped together after bending to form a closed structure; (2) two steel bars are bent to form the same structure, and the two ends of the two same bent parts are welded, tied or overlapped together after bending to form a closed structure; (3) or other structures are used to make the closed structure.

[0051] Example 3

[0052] The difference between the embodiment 1 and the embodiment 1 is that the constraint matching ring of the stirrup is a dumbbell-shaped closed structure with large ends and a small middle.

[0053] Example 4

[0054] The difference between the embodiment 1 and the embodiment 1 is that the constraint matching ring is formed by the above-mentioned stirrups and the second steel bar.

[0055] As described above, it is only the preferred specific embodiment of the present utility model. However, the design concept of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model who makes non-substantive modifications to the present utility model using this concept shall fall within the scope of infringement of the protection scope of the present utility model.

Claims

1. Ultra-high performance concrete beam, characterized in that: It includes an embedded frame and ultra-high performance concrete, the ultra-high performance concrete is cast in the embedded frame and the embedded frame is embedded in the ultra-high performance concrete; the embedded frame includes a steel bar frame and a prestressed steel strand passing through the steel bar frame, the steel bar frame includes a first steel bar and a steel bar assembly, the steel bar assembly includes stirrups, the steel bar assembly forms a constraint matching ring, the prestressed steel strand and the first steel bar are extended along a first direction, the steel bar assembly is arranged along a second direction, the second direction is arranged perpendicular to the first direction, and at least part of the prestressed steel strand is passed through the constraint matching ring.

2. The ultra-high performance concrete beam according to claim 1, characterized in that: The steel bar assembly has two side ends, the two sides of the side ends are expanded outward, at least part of the prestressed steel strands are passed through the side ends, and after the ultra-high performance concrete is poured, horseshoe-shaped structures are formed on the two side ends of the ultra-high performance concrete beam.

3. The ultra-high performance concrete beam according to claim 1, characterized in that: The first rebar and the rebar assembly are connected together.

4. The ultra-high performance concrete beam according to claim 1, 2 or 3, characterized in that: The steel bar assembly also includes a second steel bar, the second steel bar is connected to the stirrup and the stirrup is formed with the above-mentioned constraint matching ring, and the second steel bar is extended along the second direction.

5. The ultra-high performance concrete beam according to claim 4, characterized in that: The steel bar assembly includes two second steel bars arranged at intervals along a third direction, the third direction is perpendicular to the first direction and the second direction, the stirrup and the two second steel bars are connected together, and the constraint matching ring has a middle area located between the two second steel bars and two side areas located on both sides of the middle area, and the side areas are located outside the two second steel bars; the stirrup has a first straight line segment, two second straight line segments respectively fixed at both ends of the first straight line segment, and two third straight line segments respectively fixed at the ends of the second straight line segment, the two third straight line segments are cross-arranged, and the first straight line segment is fixed at the end of the second steel bar.

6. The ultra-high performance concrete beam according to claim 5, characterized in that: The ends of the two third straight line segments are respectively fixed to the two second steel bars.

7. The ultra-high performance concrete beam according to claim 5, characterized in that: The prestressed steel strand is passed through a middle area of ​​the constraint matching ring, and a plurality of first steel bars are passed through the side area.

8. The ultra-high performance concrete beam according to claim 5, characterized in that: Prestressed steel strands are inserted into the middle region and the side regions of the constraint fitting ring, and a plurality of first steel bars are also inserted into the middle region of the constraint fitting ring.

9. The ultra-high performance concrete beam according to claim 1, characterized in that: The stirrup is formed with the above-mentioned constraint matching ring, and the stirrup is extended along the second direction.

10. The ultra-high performance concrete beam according to claim 9, characterized in that: The restraining matching ring of the stirrup is a dumbbell-shaped closed structure with large ends at both ends and a small middle. The dumbbell-shaped closed structure has two head parts and a radial part connected between the two head parts and extending along the second direction. The two head parts constitute the two side ends of the steel bar assembly. The head parts are arranged to expand outward relative to the radial part. At least part of the prestressed steel strands are passed through the head parts. After the ultra-high performance concrete is poured, horseshoe-shaped structures are formed at the two side ends of the ultra-high performance concrete beam.

11. The ultra-high performance concrete beam according to claim 10, characterized in that: The head includes a fourth straight line segment extending along a third direction, and a fifth straight line segment formed by vertically extending from the end of the fourth straight line segment, wherein the third direction is perpendicular to the first direction and the second direction, the end of the fifth straight line segment is bent toward another fifth straight line segment to form an inclined sixth straight line segment, and the radial portion includes two seventh straight line segments, and the seventh straight line segment connects the ends of the sixth straight line segments of the two heads.

12. The ultra-high performance concrete beam according to claim 1, 2 or 3, characterized in that: The steel bar assembly also includes a second steel bar, which is connected to the stirrups. The second steel bar and stirrups connected together cooperate to form the above-mentioned constraint matching ring, and the second steel bar is extended along the second direction.

13. The ultra-high performance concrete beam according to claim 1, characterized in that: It also includes a protective member, which is arranged on the outer surface of the ultra-high performance concrete, and the outer surface of the protective member is flush with the outer surface of the ultra-high performance concrete.

14. The ultra-high performance concrete beam according to claim 1, characterized in that: Also included are mounting holes for engaging external building construction equipment, the mounting holes being provided in the ultra-high performance concrete.

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