Lightweight UHPC (Ultra High Performance Concrete) fabricated connecting structure and staircase

Abstract

The invention relates to the technical field of fabricated buildings, in particular to a lightweight UHPC fabricated connecting structure and a stair. The connecting structure comprises a fixing piece provided with a first steel bar, a bearing piece provided with a second steel bar, and a connecting piece embedded with a metal corrugated pipe, the first reinforcing steel bar comprises a first pre-buried section pre-buried in the fixing piece and a first outward extending section located outside the fixing piece; the second reinforcing steel bar comprises a second pre-buried section pre-buried in the bearing part and a second outward extending section located outside the bearing part; the first outward-extending section and the second outward-extending section are inserted into the metal corrugated pipe from pipe openings in the two ends of the metal corrugated pipe respectively, the first outward-extending section and the second outward-extending section are connected through steel wire winding to form an integral part, and the space between the integral part and the inner wall of the metal corrugated pipe is filled with UHPC materials. According to the connecting structure, by forming a steel bar-corrugated pipe-UHPC composite whole, the good stability and shock resistance of the connecting structure are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, and in particular to a lightweight UHPC prefabricated connection structure and staircase. Background Technology

[0002] Staircases are components in buildings that serve as vertical transportation links between floors, particularly when there are significant differences in elevation. For industrial building projects like tobacco factories, which prioritize construction speed, stable quality, and controllable costs, prefabricated staircases are typically used. These prefabricated staircases can be produced simultaneously with the factory's main foundation structure. Once the main structure is completed on-site, the staircases can be directly transported to the site for hoisting, significantly shortening the overall construction cycle.

[0003] In recent years, prefabricated concrete structures have been widely used in the building construction field. Traditional prefabricated stair slabs are all made of ordinary cement, solidly prefabricated in one piece, resulting in a heavy overall weight, increasing the building's overall weight and putting significant pressure on the supporting beams, which is detrimental to the building's stability. Furthermore, hoisting them is time-consuming, labor-intensive, and wasteful of materials, leading to low practicality. Some designs have proposed hollow staircases, with PVC pipes embedded and steel wire wrapped around them, but none of these designs prioritize improving the staircase's seismic performance. The connection method between the prefabricated staircase and the platform beam affects the staircase's seismic performance. During an earthquake, the staircase bears the seismic load along with the main structure. Current prefabricated staircases are connected by overlapping joints with the main structure, using vertically embedded reinforcing bars for cement pouring and fixation. While this provides some safety, seismic performance cannot be fully guaranteed with ordinary overlapping joints. It is highly likely that during an earthquake, the staircase will vibrate along with the main structure, leading to structural damage and hindering escape speed. For prefabricated assembled stairs, bolts and reinforcing bars are the best choice for connection, provided that safety and load-bearing capacity are guaranteed. However, the grouting cement poured into the gaps can sometimes lead to a deterioration in the quality of the concrete, poor adhesion between the concrete and the old concrete, weak bonding, and shrinkage over time. Stairs with cement-filled gaps have a short service life, and it is questionable whether the quality and safety can be fully guaranteed.

[0004] Patent document CN219587073U discloses a snap-fit ​​lightweight UHPC precast stair slab, comprising a stair slab body cast from UHPC slag-ceramic sand alkali-activated concrete mixed with straw fiber. The stair slab body has an insertion part, and the platform beam has a corresponding insertion groove. Polystyrene particles are filled between the outer wall of the insertion part and the inner wall of the insertion groove. The platform beam has multiple first connecting bolts, and the stair slab body has multiple corresponding first step holes. The platform beam has an inclined shock-absorbing platform, and polytetrafluoroethylene is filled between the top wall of the shock-absorbing platform and the bottom wall of the stair slab body. The lower beam has multiple vertically arranged second connecting bolts, and the stair slab body has multiple corresponding second step holes.

[0005] In this prior art, the connector and the slot are filled with polystyrene particles. However, polystyrene particles have a low modulus of elasticity and almost no structural bearing capacity. Under long-term loads, the filling layer will undergo significant compressive creep, causing the connection joint to loosen and creating space for movement within the slot, affecting usability and safety. At the same time, polystyrene particles are flammable materials that will melt and burn when exposed to fire. Using them at critical joints connecting platform beams and stair slabs severely reduces the fire resistance of these joints. Summary of the Invention

[0006] The present invention aims to solve the above problems by providing a stable, earthquake-resistant, lightweight UHPC prefabricated connection structure and staircase.

[0007] The technical solution to the problem of this invention is, firstly, to provide a lightweight UHPC prefabricated connection structure, including a fixing member with a first reinforcing bar, a load-bearing member with a second reinforcing bar, and a connector with a pre-embedded metal corrugated pipe for connecting the fixing member and the load-bearing member; the first reinforcing bar includes a first embedded section pre-embedded in the fixing member and a first extended section located outside the fixing member; the second reinforcing bar includes a second embedded section pre-embedded in the load-bearing member and a second extended section located outside the load-bearing member; the first extended section and the second extended section are respectively inserted into the metal corrugated pipe from the pipe openings at both ends, and the first extended section and the second extended section are connected by steel wire winding to form an integral part, and the space between the integral part and the inner wall of the metal corrugated pipe is filled with UHPC material.

[0008] As a preferred embodiment of the present invention, the UHPC material comprises steel fibers and fly ash.

[0009] As a preferred embodiment of the present invention, the load-bearing component is formed by casting UHPC material.

[0010] As a preferred embodiment of the present invention, the metal corrugated pipe is covered with fireproof cloth.

[0011] As a preferred embodiment of the present invention, the metal bellows includes a main pipe for inserting the first extension section and the second extension section, and a branch pipe communicating with the main pipe, wherein the opening of the branch pipe forms an injection port.

[0012] As a preferred embodiment of the present invention, the connector and the fixing member and the load-bearing member are respectively provided with an installation gap, and the installation gap is filled with UHPC material.

[0013] Secondly, another objective of this invention is to provide an installation method for the above-mentioned connection structure, comprising the following steps: S1. Keep one end of the steel wire fixed and control the other end of the steel wire to perform close-fitting and non-close-fitting winding on the first extended section in sequence, and then send the first extended section and the steel wire on it into the metal corrugated pipe; wherein: close-fitting winding means that the spiral ring formed by the steel wire is close to the surface of the part being wound, and non-close-fitting winding means that there is a gap between the spiral ring formed by the steel wire and the surface of the part being wound. S2. Insert the second extension section into the metal bellows and control a portion of the second extension section to pass through the gap between the wire thread and the first extension section, and then control the wire to be tightly wound on the remaining part of the second extension section. S3. After the first and second extension sections are aligned, the steel wire is clamped and pressed onto the surfaces of the first and second extension sections using a tool that can be inserted into the metal bellows. S4. Control the steel wire to be tightly wound at the ends of the integral structure of the first and second extension sections; S5. Inject UHPC material into the metal bellows and cure it.

[0014] Finally, another objective of this invention is to provide a lightweight UHPC prefabricated staircase utilizing the above-mentioned connection structure, comprising an inclined beam disposed between two platform beams and a stair slab disposed on the inclined beam; a connecting beam is provided between the platform beams and the inclined beam, and the platform beams, the connecting beam, and the inclined beam form the above-mentioned connection structure.

[0015] As a preferred embodiment of the present invention, the platform beam is provided with a plurality of first reinforcing bars, the inclined beam is provided with a plurality of second reinforcing bars, and a plurality of the metal corrugated pipes are pre-embedded in the connecting beam; the plurality of first reinforcing bars, the plurality of second reinforcing bars, and the plurality of metal corrugated pipes are arranged in a horizontal direction respectively.

[0016] As a preferred embodiment of the present invention, the side of the inclined beam away from the stair slab is provided with a back plate, and the stair slab and the back plate are connected by a connector passing through the inclined beam.

[0017] As a preferred embodiment of the present invention, the stair slab, inclined beam, and back plate form the aforementioned connection structure.

[0018] The beneficial effects of this invention are: 1. This application provides a prefabricated connection structure in which reinforcing bars inserted into a corrugated metal pipe are mechanically interlocked by wire winding and then tightly wrapped with ultra-high performance concrete (UHPC), forming a composite whole of "reinforcing bars-corrugated pipe-UHPC" with high bonding strength and anchoring force. Loads can be smoothly transferred from the load-bearing component through the second reinforcing bar, via the "integral part" inside the UHPC-filled corrugated metal pipe, to the first reinforcing bar, and then to the fixing component. This ensures effective stress diffusion and transfer, avoids localized damage caused by stress concentration, and guarantees the stability of the connection structure.

[0019] In terms of earthquake resistance: First, the reinforcing steel is a ductile material, tightly wrapped and constrained by high-strength, high-toughness UHPC. When the stress exceeds the yield strength of the reinforcing steel, it will undergo irreversible elongation or compression. Second, the wire winding ensures that the lapped reinforcing bars do not slip off each other under stress, allowing for effective force transfer. Finally, the UHPC filling acts like a clamp, tightly holding the plastically deforming reinforcing bars and preventing them from buckling due to instability. Based on this, during the repeated tensile and compressive plastic deformation process, the reinforcing steel converts the kinetic energy of the earthquake into heat energy through internal friction, thereby dissipating a large amount of earthquake energy and improving earthquake resistance.

[0020] 2. In some implementations, fireproof cloth is added to improve the fire resistance of the connection structure.

[0021] 3. This application provides a staircase that utilizes the above-mentioned prefabricated connection structure, using platform beams as fixing components and inclined beams as load-bearing components, thereby realizing the prefabricated installation of the staircase and ensuring the stability and seismic resistance of the staircase structure.

[0022] 4. In some embodiments, a back plate is added to the back of the inclined beam. The stair slab, inclined beam, and back plate are connected by connectors to form a composite beam structure. The stair slab and back plate are equivalent to the upper and lower flanges of the inclined beam, and the connectors are equivalent to the web of the beam. When a person steps on the stair slab, the stair slab is subjected to downward tension, while the back plate is subjected to upward tension through the connectors. Both resist bending together, which increases the moment of inertia of the structural section, allowing the inclined beam and stair slab to withstand greater loads and improving the stability of the staircase during use. At the same time, the added back plate and stair slab together form a box-like structure, enhancing the torsional resistance and overall stability of the staircase, making it less prone to lateral instability.

[0023] Based on this, in some embodiments, the connectors adopt the "steel bar-corrugated pipe-UHPC" composite structure mentioned above, which further improves the stability and seismic resistance of the prefabricated installation of stair slabs and inclined beams. Attached Figure Description

[0024] Figure 1This is a structural diagram of a lightweight UHPC prefabricated connection structure; Figure 2 This is a schematic diagram of the connection steps for a lightweight UHPC prefabricated connection structure. Figure 3 This is a structural schematic diagram of one embodiment of a lightweight UHPC prefabricated staircase; Figure 4 This is a schematic diagram of the connection structure of a lightweight UHPC prefabricated stair platform beam, connecting beam, and inclined beam. Figure 5 This is a top view structural diagram of the embedded part of the beam, connecting beam, and inclined beam of a lightweight UHPC prefabricated stair platform. Figure 6 This is a structural schematic diagram of another implementation of a lightweight UHPC prefabricated staircase; In the diagram: Platform beam 1, fastener 10, first reinforcing bar 11, first embedded section 111, first extended section 112, connecting beam 2, connector 20, corrugated metal pipe 21, steel wire 211, inclined beam 3, load-bearing component 30, second reinforcing bar 31, second embedded section 311, second extended section 312, stair slab 4, back plate 5. Detailed Implementation

[0025] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1

[0026] A lightweight UHPC assembly connection structure, such as Figure 1 As shown, it includes a fastener 10, a connector 20, and a load-bearing component 30. The load-bearing component 30 and the fastener 10 can be connected as a whole through the connector 20.

[0027] The fastener 10 is provided with a first reinforcing bar 11, which includes a first embedded section 111 pre-embedded within the fastener 10 and a first extended section 112 located outside the fastener 10. This is typically achieved by installing the first reinforcing bar 11 in a mold and then pouring concrete. The mold has a through hole in its side wall to allow the portion of the first reinforcing bar 11 extending beyond the mold. A sealing ring is provided on the inner wall of the through hole to prevent leakage during pouring. After pouring, the concrete forms the fastener 10, the portion of the first reinforcing bar 11 encased in concrete forms the first embedded section 111, and the portion of the first reinforcing bar 11 located outside the mold forms the first extended section 112.

[0028] The load-bearing component 30 is provided with a second reinforcing bar 31, which includes a second embedded section 311 pre-embedded in the load-bearing component 30 and a second extended section 312 located outside the load-bearing component 30. Similar to the fixing component 10 and the first reinforcing bar 11, the load-bearing component 30 and the second reinforcing bar 31 are obtained by installing the second reinforcing bar 12 in a mold with through holes and sealing rings in the side wall and then pouring concrete.

[0029] In some embodiments, the material used to cast the load-bearing component 30 can be UHPC material. UHPC material is existing technology and refers to ultra-high performance concrete including aggregates, fiber materials, and admixtures. The aggregates typically consist of cement, silica fume, quartz powder, quartz sand, water-reducing agents, etc., and may also contain mineral admixtures such as fly ash and limestone powder. The fiber materials are preferably steel fibers, but glass fibers, basalt fibers, etc., can also be used. Admixtures are selected according to construction performance requirements, such as viscosity modifiers, setting modifiers, shrinkage reducers, or expansion agents. UHPC material has the advantages of low weight and high strength. In this embodiment, the UHPC material includes steel fibers and fly ash; other components are not limited and can refer to existing formulations. The main purpose is to ensure the toughness and crack resistance of the load-bearing component 30 through steel fibers, and to fill the pores with fly ash, making the load-bearing component 30 more compact and reducing porosity.

[0030] A corrugated metal pipe 21 is pre-embedded within the connector 20. To facilitate subsequent grouting into the corrugated metal pipe 21, in this embodiment, the corrugated metal pipe 21 includes a main pipe and branch pipes perpendicularly connected to the main pipe in the axial direction. The two ends of the main pipe and the free ends of the branch pipes extend beyond or are flush with the sides of the connector 20, ensuring that the pipe openings at both ends of the main pipe and the free ends of the branch pipes are in an open state. Typically, this is also achieved by installing the corrugated metal pipe 21 in a mold and then pouring concrete. The mold has through holes for the two ends of the main pipe and the free ends of the branch pipes to extend out, and the inner wall of the through holes is provided with a sealing ring to prevent leakage during pouring.

[0031] In some embodiments, the metal corrugated pipe 21 is wrapped with fireproof cloth, such as basalt fiber fireproof cloth in the prior art. In this case, the connector 20 is obtained by the following method: prepare two molds with different outer diameters. First, install the metal corrugated pipe 21 in the small mold and lay fireproof cloth on the inner wall of the small mold. Then, grout is injected to obtain a preliminary sample with fireproof cloth wrapped on the outside and metal corrugated pipe 21 pre-embedded inside. Then, the preliminary sample is placed in the large mold and grout is injected to wrap another layer of concrete on the outside of the preliminary sample to obtain the connector 20.

[0032] The fastener 10, connector 20, and load-bearing component 30 are connected to form a connection structure through the following steps: For ease of explanation, the two ends of the steel wire 211, the metal corrugated pipe 21, the first extended section 112, and the second extended section 312 are respectively referred to as the first end and the second end. Figure 2 In the direction of the middle, the first end is the left end, and the second end is the right end.

[0033] Firstly, as Figure 2 a. Keep the first end of the steel wire 211 fixed and control the second end of the steel wire 211 to perform close-fitting and non-close-fitting winding sequentially on the first extended section 112. Close-fitting winding means that the spiral coil formed by the steel wire 211 is tightly attached to the surface of the part being wound, while non-close-fitting winding means that there is a gap between the spiral coil formed by the steel wire 211 and the surface of the part being wound. After winding is completed, the first extended section 112 and the steel wire 211 on it are fed into the metal bellows 21 from the first end port until the second end of the first extended section 112 extends out from the second end port of the metal bellows 21, and the first and second ends of the steel wire 211 are controlled to be outside the ports at both ends of the metal bellows 21, respectively.

[0034] Then as Figure 2 b. The second extension section 312 is fed into the metal bellows 21 from the second end port of the metal bellows 21, and the second extension section 312 is controlled to pass through the gap between the steel wire spiral and the first extension section 112. After passing through all the non-tight winding spirals, the second end of the steel wire 211 is controlled to be tightly wound on the remaining part of the second extension section 312.

[0035] For example Figure 2 c. Control the second extension section 312 to continue inserting into the metal bellows 21 until the first end of the second extension section 312 protrudes from the first end of the metal bellows 21. At this time, the steel wire spiral coils that are simultaneously wound around the first extension section 112 and the second extension section 312, and the steel wire spiral coils that are only wound around the second extension section 312, will produce wrinkles. The operator needs to use a tool that can be inserted into the metal bellows 21 to clamp and press this part of the steel wire onto the surface of the first extension section 112 and the second extension section 312.

[0036] For example Figure 2 d. Control the first end of the steel wire 211 to be tightly wound around the end of the integral structure of the first extended section 112 and the second extended section 312, while simultaneously controlling the second end of the steel wire 211 to be tightly wound around the end of the integral structure of the first extended section 112 and the second extended section 312, so as to further tighten the first extended section 112 and the second extended section 312. Wherein, as... Figure 1 As shown, there are installation gaps between the connector 20, the fixing member 10, and the load-bearing member 30, so that the operator can insert the tool to complete this part of the close-fitting winding.

[0037] Finally, UHPC material is injected into the main pipe of the metal corrugated pipe 21 through the branch pipes and cured. Meanwhile, as... Figure 1As shown, UHPC material can also flow from the pipe openings at both ends of the metal corrugated pipe 21 to the installation gap between the connector 20, the fixing member 10, and the load-bearing member 30, thus filling the installation gap. Similarly, the UHPC material used here includes steel fibers and fly ash; other components are not limited and can be referenced from existing formulations.

[0038] Under this connection step, the first extension section 112 and the second extension section 312 inside the metal bellows 21 can be connected by winding steel wire 211 to form an integral part, and the integral part and the inner wall of the metal bellows 21 are filled with UHPC material to form a connection structure. Example 2

[0039] A lightweight UHPC prefabricated staircase is formed using the connection structure of Example 1.

[0040] like Figure 3 As shown, the staircase includes an inclined beam 3 disposed between two platform beams 1 and a stair slab 4 disposed on the inclined beam 3. In this application, a connecting beam 2 is provided between the platform beam 1 and the inclined beam 3, and the platform beam 1, the connecting beam 2, and the inclined beam 3 form the above-mentioned connecting structure.

[0041] Specifically: platform beam 1 is the fixing component 10, connecting beam 2 is the connecting component 20, and inclined beam 3 is the load-bearing component 30. In this embodiment, as... Figure 4 As shown, platform beam 1 is L-shaped, including a base and an embedded part set on the base. The first reinforcing bar 11 is set in the embedded part, as shown. Figure 5 As shown, the embedded part is provided with a plurality of first reinforcing bars 11, which are arranged horizontally. Each first reinforcing bar 11 includes a first embedded section 111 embedded in the embedded part and a first extended section 112 located outside the embedded part. Figure 4 and Figure 5 As shown, the connecting beam 2 overlaps onto the base of the platform beam 1. Correspondingly, the connecting beam 2 has pre-embedded metal corrugated pipes 21 in the same number as the first reinforcing bars 11, with several metal corrugated pipes 21 arranged horizontally. Similarly, the inclined beam 3 has correspondingly provided second reinforcing bars 31 in the same number as the first reinforcing bars 11, with several second reinforcing bars 31 arranged horizontally. Figure 3 As shown, the middle section of each second steel bar 31 is the second embedded section 311, which is embedded in the inclined beam 3, and the two end sections are the second extended sections 312.

[0042] The installation method of platform beam 1, connecting beam 2, and inclined beam 3 is the same as in embodiment 1: First, steel wire 211 is sequentially wrapped tightly and loosely around the first extension section 112 of several first reinforcing bars 11, and then inserted into the corresponding corrugated metal pipe 21, so that the connecting beam 2 overlaps on the base of platform beam 1; then, the corresponding second reinforcing bar 31 second extension section 312 is inserted, ensuring that the second extension section 312 is inserted into the gap between the steel wire spiral and the first extension section 112, and that steel wire is wrapped tightly around the second extension section 312; then, the steel wire 211 is adjusted, and the first extension section 112 and the second extension section 312 are further wound and connected at the end; finally, UHPC material is injected. Similarly, there are installation gaps between the connecting beam 2 and the embedded part of platform beam 1, and between the inclined beam 3, and UHPC material should fill these gaps. Based on this, several "reinforcing bar-corrugated pipe-UHPC" composite units can be formed, improving the connection strength.

[0043] In some implementations, such as Figure 4 As shown, a groove is provided in the part corresponding to the installation gap of the platform beam 1 base. The UHPC material fills the installation gap and also fills the groove, so that the connecting beam 2 and the platform beam 1 are further connected and reinforced, and the connection stability is improved.

[0044] In some implementations, such as Figure 4 As shown, after the platform beam 1, connecting beam 2, and inclined beam 3 are connected, cover plates are installed on the pre-embedded part of the platform beam 1 and the top surface of the connecting beam 2 to cover the branch pipe opening on the connecting beam 2 used for injecting UHPC material into the metal corrugated pipe 21. Preferably, the top of the pre-embedded part of the platform beam 1 is provided with a slot, and the cover plate is detachably connected to the platform beam 1 by a locking block that can cooperate with the slot.

[0045] Finally, the installation of the prefabricated staircase is completed by installing the stair treads 4 on the inclined beam 3. The structure and installation method of the stair treads 4 are not limited; any existing technology can be used. For example, the stair treads 4 typically include horizontal treads and vertical connecting plates, such as... Figure 4 As shown, the inner corner of the pedal and the connecting plate is connected as a whole by an L-shaped angle steel. The inclined beam 3 has a slot into which the free ends of the pedal and the connecting plate can be inserted. Then, screws are driven through the pedal and / or the connecting plate and nailed into the inclined beam 3 for fixation. In some embodiments, a protective angle steel is provided at the outer corner of the pedal and the connecting plate. In some embodiments, the side of the pedal away from the inclined beam 3 is provided with anti-slip texture. Example 3

[0046] This embodiment is basically the same as embodiment 2, except that the installation methods of the inclined beam 3 and the stair slab 4 are different.

[0047] like Figure 6As shown, the side of the inclined beam 3 away from the stair slab 4 is provided with a back plate 5, and the stair slab 4 and the back plate 5 are connected by a connector passing through the inclined beam 3.

[0048] Specifically: The platform beams 1 at both ends of the inclined beam 3 are provided with mounting grooves, and both ends of the back plate 5 are inserted into these mounting grooves. In some embodiments, the position of the mounting groove corresponds to the installation gap between the inclined beam 3 and the connecting beam 2. When the UHPC material fills the installation gap, it can also fill the gap between the back plate 5 and the inner wall of the mounting groove, improving installation strength. The joint corner of the stair tread 4 and the connecting plate is still fixed by an L-shaped angle steel connection. Then, a connecting hole is provided in the inclined beam 3, with its axial direction perpendicular to the axial direction of the second reinforcing bar 31. The connecting hole is located between two adjacent first reinforcing bars 31. One end of the connector is welded to the angle steel, and the other end passes through the connecting hole and is welded to the back plate 5.

[0049] The connector can be a reinforcing bar or other structures with connecting functions. In some embodiments, the connector includes a corrugated metal pipe, a first reinforcing bar, a second reinforcing bar, and a steel wire, so that the stair slab 4, the inclined beam 3, and the back plate 5 form the connection structure of Embodiment 1. Specifically: a first reinforcing bar is welded to the angle steel of the stair slab 4, a second reinforcing bar is welded to the back plate 5, and the connecting hole in the inclined beam 3 is the pipe hole of the corrugated metal pipe. Similarly, the first and second reinforcing bars are inserted into the corrugated metal pipe from both ends and fixed by winding with steel wire. Then, UHPC material is injected into the corrugated metal pipe and cured. The UHPC material may also flow from the corrugated metal pipe into the gap between the inclined beam 3 and the back plate 5 for reinforcement. To facilitate grouting into the corrugated metal pipe, the connecting plate and angle steel of the stair slab 4 can be installed on the inclined beam 3 first. After grouting is completed, one end of the tread is inserted into the slot of the inclined beam 3, and the other end is welded to the angle steel.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A lightweight UHPC fabricated connection structure, characterized in that: The fixed part (10) is provided with a first reinforcing bar (11), the load-bearing part (30) is provided with a second reinforcing bar (31), and the connecting part (20) is embedded with a metal bellows (21) and used for connecting the fixed part (10) and the load-bearing part (30); The first reinforcing bar (11) comprises a first embedded section (111) embedded in the fixed part (10) and a first overhanging section (112) located outside the fixed part (10); The second reinforcing bar (31) comprises a second embedded section (311) embedded in the load-bearing part (30) and a second overhanging section (312) located outside the load-bearing part (30); The first overhanging section (112) and the second overhanging section (312) are respectively inserted into the metal bellows (21) from the pipe orifices of the two ends of the metal bellows (21), and the first overhanging section (112) and the second overhanging section (312) are integrally connected by being wound by a steel wire (211), and the integral part is filled with UHPC material between the inner wall of the metal bellows (21).

2. The lightweight UHPC fabricated connecting structure according to claim 1, characterized in that: The UHPC material comprises steel fibers and fly ash.

3. The lightweight UHPC fabricated connecting structure according to claim 1, characterized in that: The load-bearing part (30) is formed by pouring UHPC material.

4. The lightweight UHPC fabricated connecting structure according to claim 1, characterized in that: The metal bellows (21) is coated with fireproof cloth.

5. The lightweight UHPC fabricated connection structure according to claim 1, characterized in that: The metal bellows (21) comprises a main pipe for inserting the first overhanging section (112) and the second overhanging section (312) and a branch pipe in communication with the main pipe, and the pipe orifice of the branch pipe forms an injection port.

6. The lightweight UHPC fabricated connection structure according to claim 1, characterized in that: The connecting part (20) has installation gaps between the fixed part (10) and the load-bearing part (30), respectively, and the installation gaps are filled with UHPC material.

7. A lightweight UHPC fabricated stair, comprising a stringer (3) arranged between two platform beams (1), and a stair plate (4) arranged on the stringer (3); characterized in that: The platform beam (1) and the inclined beam (3) are provided with a connecting beam (2), and the platform beam (1), the connecting beam (2) and the inclined beam (3) form the connecting structure as claimed in any one of claims 1-6.

8. The lightweight UHPC fabricated stair according to claim 7, characterized in that: The platform beam (1) is provided with a plurality of first reinforcing bars (11), the inclined beam (3) is provided with a plurality of second reinforcing bars (31), and the connecting beam (2) is embedded with a plurality of metal bellows (21); the plurality of first reinforcing bars (11), the plurality of second reinforcing bars (31) and the plurality of metal bellows (21) are arranged along the horizontal direction, respectively.

9. The lightweight UHPC fabricated stair of claim 7, wherein: The inclined beam (3) is provided with a back plate (5) away from the stair plate (4), and the stair plate (4) and the back plate (5) are connected by a connecting part penetrating through the inclined beam (3).

10. The lightweight UHPC fabricated stair of claim 9, wherein: The stair plate (4), the inclined beam (3) and the back plate (5) form the connecting structure as claimed in any one of claims 1-6.

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