A UHPC lightweight floor prefabricated component and its forming method

Abstract

The present invention relates to the technical field of prefabricated building panels, and provides a UHPC lightweight floor slab prefabricated component and a forming method thereof, which solves the problems of insufficient bonding strength of the joint surface of existing prefabricated panels, high weight and low strength, and low on-site construction efficiency. The present invention includes a concrete slab body, wherein a structural frame and at least one structural plate with plate holes distributed on the surface are provided inside the concrete slab body, and a plurality of structural grooves are provided on the top of the concrete slab body, each of the structural grooves includes a staggered transverse structural groove and a longitudinal structural groove, each of the longitudinal structural grooves is parallel to each other, and each of the transverse structural grooves is parallel to each other; the present invention arranges transverse and longitudinal structural grooves on the top of the concrete slab body to form a regular "keyway" system, and when the concrete superposition layer is subsequently poured on site, the new concrete is embedded in the groove to form a strong bite, so that the prefabricated part and the cast-in-place layer are combined into a solid whole.

Description

Technical Field

[0001] The present invention relates to the technical field of building prefabricated panels, and in particular to a UHPC lightweight floor prefabricated component and a forming method thereof. Background Art

[0002] In the field of prefabricated buildings, precast composite floor slabs are widely used because they combine the efficiency of factory prefabrication with the structural integrity of cast-in-place structures. Traditional composite floor slabs often combine ordinary precast concrete layers with cast-in-place layers. Composite slabs are factory-produced and easy to install on-site, significantly shortening the construction period and improving construction efficiency. However, due to the insufficient bond strength between the precast and cast-in-place layers, they are prone to peeling and damage.

[0003] In the existing technology, although aerated concrete precast panels can achieve both lightness and thermal insulation, due to the material defects of aerated concrete, it is difficult to use it directly as a structural layer. In order to compensate for the strength of the aerated concrete composite panel, it is usually necessary to add an external steel frame. However, due to the insufficient connection strength between the additional steel bars and the concrete of the precast panel body, the weight is large and the strength is low. The additional steel frame requires complicated binding steps, resulting in low on-site construction efficiency. Summary of the Invention

[0004] A UHPC lightweight floor prefabricated component comprises a concrete slab, wherein a structural frame and at least one structural plate with plate holes distributed on the surface are provided inside the concrete slab, wherein the structural plate is provided at the bottom of the structural frame, and the structural frame comprises a plurality of longitudinal reinforcement cages arranged parallel to each other in a triangular structure and a connecting bar group connecting the longitudinal reinforcement cages;

[0005] Each of the longitudinal reinforcement cages includes two inverted V-shaped wavy reinforcements and a longitudinal reinforcement located on top of the wavy reinforcements. A plurality of structural grooves are provided on the top of the concrete slab. Each of the structural grooves includes a transverse structural groove and a longitudinal structural groove arranged alternately. Each of the longitudinal structural grooves is parallel to each other and is respectively arranged between adjacent longitudinal reinforcement cages. Each of the transverse structural grooves is parallel to each other and is correspondingly arranged at the trough of the wavy reinforcement.

[0006] The connecting reinforcement group includes a plurality of transverse reinforcements and a plurality of fixing parts. Each transverse reinforcement is arranged under the structural plate. Each fixing part is arranged at intervals along each transverse reinforcement. The top of each fixing part is connected to the longitudinal reinforcement cage, and the bottom of each fixing part passes through the plate hole on the structural plate and is connected to the corresponding transverse reinforcement.

[0007] Furthermore, each of the fixing members is V-shaped, and both ends of each of the fixing members are in the shape of inverted hooks. After the bottom of each of the fixing members is hooked on the corresponding transverse reinforcement, the inverted hook is hung on the corresponding wavy reinforcement.

[0008] Furthermore, the two ends of the wavy curved bars of the same longitudinal reinforcement cage are away from each other and extend in a direction parallel to the longitudinal bars.

[0009] Furthermore, both sides of each structural groove are inclined surfaces.

[0010] Furthermore, when the number of the structural plates exceeds one, the length direction of each structural plate is parallel to each transverse rib.

[0011] Furthermore, an extension rib is provided in each of the transverse structural grooves, and an end portion of each of the extension ribs protrudes out of the edge of the concrete slab.

[0012] Furthermore, a plurality of bench ribs are provided at the bottom of each extension rib, so that there is a gap between each extension rib and each transverse structural groove, and a depression for placing the extension rib is provided at the top of each bench rib.

[0013] A method for forming a UHPC lightweight floor prefabricated component, for preparing the above-mentioned UHPC lightweight floor prefabricated component, comprises the following steps:

[0014] S1. Set up the connecting reinforcement group, place the fixings at the corresponding position above the structural plate, lift the structural plate, pass the bottom of the fixings through the plate holes of the structural plate, and then install transverse reinforcement at the bottom of the fixings;

[0015] S2. Assemble the mold, which includes four side templates connected end to end. Adjacent side templates are connected by bolts and nuts. The bolts are inserted into the connection holes at the ends of each side template and tightened with nuts. The side templates corresponding to the ends of the longitudinal reinforcement cage are provided with slots for accommodating the ends of the longitudinal reinforcement and the wavy curved reinforcement.

[0016] S3. Spraying a release agent into the assembled mold;

[0017] S4. Erect the structural frame, place the assembled connecting reinforcement group in the assembled mold, place the longitudinal reinforcement of the longitudinal reinforcement cage and the ends of the wavy curved reinforcement in the slots of the side template, and hang the hooks at both ends of the fixing parts on the wavy curved reinforcement;

[0018] S5. Use ultra-high performance concrete for pouring;

[0019] S6. Pre-setting the structural groove: Before the concrete has initially set, place a first structural member for forming the transverse structural groove and a second structural member for forming the longitudinal structural groove on the poured concrete and press downward. The first structural member is in the shape of an elongated strip with protrusions on both sides. The second structural member includes a plurality of structural blocks and connecting strips. The structural blocks are spaced apart below the connecting strips, and the first structural members are spaced apart from the second structural members.

[0020] S7, demoulding, allowing the concrete to solidify naturally to form an initial setting slab, and then removing the initial setting slab from the mold;

[0021] S8. Component curing: Wrap the initial setting slab with moistened geotextile and place it in a cool and ventilated place for more than 72 hours to obtain a concrete slab;

[0022] S9. Insert the extension reinforcement into the transverse structural groove;

[0023] S10. Set stool reinforcement at the bottom of the extension reinforcement to obtain a UHPC lightweight floor prefabricated component.

[0024] Furthermore, in step S4: a clamping platform for placing the end portion of the structural plate is provided on the inner side of the side formwork corresponding to the two ends of the transverse reinforcement.

[0025] Furthermore, in step S10: the stool reinforcement, longitudinal reinforcement and extension reinforcement are tied and fixed with wire.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This invention uses a longitudinal reinforcement cage with a built-in triangular structure (two wave-shaped curved bars + top longitudinal reinforcement) to form a spatial truss structure, providing strong bending and shear resistance, significantly improving the load-bearing capacity and deformation resistance of the floor slab, eliminating the on-site reinforcement binding process, and accelerating construction efficiency. The longitudinal reinforcement on both sides of the bottom of the wave-shaped curved bars is eliminated to reduce the weight ratio of the steel bars. The structural plate is used to supplement the structural strength of the wave-shaped curved bars at the wave crest.

[0028] 2. This invention incorporates a regular "keyway" system of transverse and longitudinal structural grooves in the top of the concrete slab. When the subsequent concrete overlay is poured on-site, the new concrete embeds into the grooves, creating a strong interlocking force that firmly bonds the precast and cast-in-place layers together, ensuring the integrity and synergy of the slab.

[0029] 3. The connecting reinforcement group (transverse reinforcement + fixing parts) used in the present invention not only connects each longitudinal reinforcement cage into an integral frame, but also firmly connects it to the transverse reinforcement below through the plate holes of the structural plate, ensuring the coordinated work and stability of the entire internal skeleton. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the concrete slab structure according to the first embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the structural frame connection structure of an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the longitudinal structural groove arrangement structure according to the first embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the configuration of the transverse structural groove according to the first embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the stool reinforcement arrangement according to the first embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the arrangement of the first structural member and the second structural member in accordance with the second embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the cross-sectional structure of the first structural member and the second structural member of the second embodiment of the present invention.

[0037] Description of Figure Numbers:

[0038] Concrete slab 1;

[0039] Structure frame 2;

[0040] Structural plate 3;

[0041] Longitudinal reinforcement cage 4; wavy curved reinforcement 41; straight line segment 411; longitudinal reinforcement 42;

[0042] Connecting rib group 5; transverse rib 51; fixing piece 52;

[0043] Structural groove 6; transverse structural groove 61; longitudinal structural groove 62; first structural member 63; protrusion 631; second structural member 64; structural block 641; connecting strip 642;

[0044] Extension ribs 7;

[0045] Stool reinforcement 8; depression 81. DETAILED DESCRIPTION

[0046] The following will describe the implementation methods of the present invention in detail with reference to specific embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0047] Example 1: Figures 1 to 5 As shown, a UHPC lightweight floor prefabricated component includes a concrete slab body 1, wherein a structural frame 2 and at least one structural plate 3 with plate holes distributed on the surface are provided inside the concrete slab body 1. The structural plate 3 is provided at the bottom of the structural frame 2. The structural frame 2 includes a plurality of longitudinal steel cages 4 in a triangular structure and arranged parallel to each other, and a connecting rib group 5 connecting each longitudinal steel cage 4. The longitudinal steel cage 4 is the "backbone" of the entire component and bears the main bending and shear stresses.

[0048] The plate holes on the structural plate 3 can be circular, triangular, honeycomb, square, etc. In this embodiment, the plate holes are circular.

[0049] Each longitudinal reinforcement cage 4 includes two wavy curved bars 41 arranged in an inverted V shape and a longitudinal bar 42 located at the top of the wavy curved bars 41. The bars are typically cold-rolled ribbed steel bars or threaded steel bars. The two wavy curved bars 41 are close to each other in the top area but do not intersect. The longitudinal bar 42 is firmly fixed to the intersection of the top wave crests of the two wavy curved bars 41 by spot welding or binding. The two wavy curved bars 41 of the same longitudinal reinforcement cage 4 are bent away from each other at both ends and eventually extend into a straight segment 411 parallel to the top longitudinal bar 42. This design greatly enhances the structural integrity of the two ends of the component, facilitates connection with adjacent components or beams and columns, and during production, the ends of the wavy curved bars 41 and the longitudinal bars 42 can be fixed to the formwork together to ensure the stability of the longitudinal reinforcement cage 4 during the casting process.

[0050] The connecting reinforcement group 5 includes a plurality of transverse reinforcements 51 (usually perpendicular to the direction of the longitudinal reinforcement cage 4) and a plurality of fixings 52. Each transverse reinforcement 51 is arranged below the structural plate 3. Each fixing 52 is arranged at intervals along each transverse reinforcement 51. The top of each fixing 52 is connected to the longitudinal reinforcement cage 4, and the bottom of each fixing 52 passes through the plate hole on the structural plate 3 and is connected to the corresponding transverse reinforcement 51.

[0051] Each of the fixing members 52 is V-shaped, and both ends of each of the fixing members 52 are in the shape of inverted hooks. The bottom of each of the fixing members 52 is hooked on the corresponding transverse rib 51 and then the inverted hook is hung on the corresponding wavy curved rib 41 .

[0052] The fixings 52 are arranged along the length of the transverse reinforcement 51, one for each trough. The process works as follows: the bottom of the fixing 52 hooks onto the corresponding transverse reinforcement 51, while the barbed hooks on either side of the top (the V-shaped open end) of the fixing 52 hook downward onto the wavy curved reinforcement 41 of the longitudinal reinforcement cage 4 (preferably near a trough or across two wavy reinforcements). This "one hook, one hook" arrangement achieves an efficient and secure connection from the longitudinal reinforcement cage 4 to the fixing 52 and then to the transverse reinforcement 51, eliminating the need for complex tying or welding and ensuring the spatial stability and coordinated operation of the entire framework.

[0053] A plurality of structural grooves 6 are provided on the top of the concrete slab 1, each of the structural grooves 6 includes a transverse structural groove 61 and a longitudinal structural groove 62 that are staggered. The longitudinal structural grooves 62 are parallel to each other and are respectively arranged between adjacent longitudinal steel cages 4. The transverse structural grooves 61 are parallel to each other and are correspondingly arranged at the trough of the wavy curved reinforcement 41, forming a regular grid-like "key groove".

[0054] Both sides of each structural groove 6 are inclined surfaces, and this design is the core of generating strong mechanical bite force with cast-in-place concrete in the future.

[0055] After the prefabricated floor components are laid at the construction site, a superimposed cast-in-place layer is poured on top of them. The cast-in-place concrete will fully flow into and fill these structural grooves 6. After solidification, the inclined structure greatly increases the contact friction area and the embedding effect between the new and old concrete, forming an efficient shear bond, ensuring that the prefabricated layer and the cast-in-place layer become a solid whole, resisting horizontal shear forces (such as earthquakes), effectively preventing the bonding surface from peeling, and improving the integrity and continuity of the floor.

[0056] In this embodiment, the structural plates 3 are arranged corresponding to the troughs of the wave ribs 41 , the transverse ribs 51 are arranged corresponding to the structural plates 3 , and the length direction of each structural plate 3 is parallel to each transverse rib 51 .

[0057] The transverse reinforcement 51 is connected to the upper longitudinal reinforcement cage 4 through dense fixing parts 52, forming an overall constraint on the structural plate and a reliable force transmission path, further ensuring the structural efficiency and overall stability of the lightweight structural plate 3 in the prefabricated component.

[0058] This application does not impose any specific limitation on the number of the structural slots 6 and the number can be adjusted based on actual conditions.

[0059] An extension rib 7 is provided in each of the transverse structural grooves 61 , and an end portion of each of the extension ribs 7 protrudes out of the edge of the concrete slab 1 .

[0060] Different from the transverse reinforcement of the existing precast slabs, the transverse reinforcement 51 of the present application is set at a lower position of the cross-section height of the slab. After the holes are opened in the mold to place the transverse reinforcement 51, the sealing cost is relatively high. If the transverse reinforcement 51 is cancelled and extended to both sides of the concrete slab 1, the connection strength between the slab and the cast-in-place layer in the transverse direction on both sides is slightly insufficient. The design of the extension reinforcement 7 reserves sufficient lap or mechanical connection length when the transverse reinforcement is cancelled and extended to both sides of the concrete slab 1, which is used to connect with the corresponding extension reinforcement 7 of the adjacent components on site to transmit negative bending moment and lateral tension.

[0061] To ensure sufficient concrete cover thickness at the bottom of the extension bar 7 and prevent it from sinking, several bench bars 8 are spaced along its length. The top of the bench bar 8 is machined with a depression 81 that matches the diameter of the extension bar 7 for precise placement and positioning of the extension bar 7.

[0062] The height of the bench reinforcement 8 is designed to create a constant spacing between the extension reinforcement 7, which is placed in the recess, and the bottom surface of the transverse structural groove 61. This spacing constitutes the effective protective layer thickness of the extension reinforcement 7 in the final composite floor slab after subsequent casting. The bench reinforcement 8 is secured to the longitudinal reinforcement 42 above or to nearby steel bars by wire tying.

[0063] Example 2: Figures 6 and 7 As shown, a method for forming a UHPC lightweight floor prefabricated component is used to prepare the UHPC lightweight floor prefabricated component described in Example 1, comprising the following steps:

[0064] S1. Set up the connecting reinforcement group 5, place the fixing piece 52 at the corresponding position above the structural plate 3, lift the structural plate 3, pass the bottom of the fixing piece 52 through the plate hole of the structural plate 3, and then install the transverse reinforcement 51 at the bottom of the fixing piece 52.

[0065] S2. Assemble the mold. The mold includes four side templates (not shown in the figure) connected end to end. Adjacent side templates are connected by bolts and nuts. The bolts are inserted into the connecting holes at the ends of each side template and locked with nuts. The side templates corresponding to the two ends of the longitudinal reinforcement cage are provided with slots for placing the longitudinal reinforcement and the ends of the wavy curved reinforcement (not shown in the figure, which is an existing design). The settings of the side templates, bolts, nuts and slots are all existing technologies and will not be repeated here.

[0066] S3. Spray a release agent into the assembled mold.

[0067] S4. Build the structural frame 2, place the built connecting rib group 5 in the assembled mold, place the longitudinal ribs 42 of the longitudinal reinforcement cage 4 and the ends of the wavy curved ribs 41 in the slots of the side template, and hang the inverted hooks at both ends of the fixing piece 52 on the wavy curved ribs 41.

[0068] S5. Use ultra-high-performance concrete (UHPC) with suitable fluidity (typically 600-750mm of expansion) for pouring. The pouring process should be carried out in sections along the length of the mold, ensuring that the concrete envelops all rebar, particularly in the slots, fixtures 52, and holes in the structural slab 3. Use a small vibrator (such as an insertable or attached vibrator) to moderately vibrate (avoid over-vibration) to expel large bubbles and ensure that the concrete completely fills the mold. Pay particular attention to the area below the structural slab 3 and areas with dense rebar (such as around troughs). The vibration time must be strictly controlled to prevent segregation or rebar displacement.

[0069] S6, pre-setting the structural groove 6, is performed after the UHPC is poured and the concrete has not yet initially set (it is still plastic, usually within 20-60 minutes after pouring, depending on the ambient temperature and the UHPC formula). The first structural member 63 for forming the transverse structural groove 61 and the second structural member 64 for forming the longitudinal structural groove 62 are placed on the poured concrete and pressed down. The first structural member 63 is in the shape of an elongated strip, and protrusions 631 are provided on both sides of the first structural member 63. The second structural member 64 includes a plurality of structural blocks 641 and connecting bars 642. Each of the structural blocks 641 is arranged at intervals below the connecting bar 642, and each of the first structural members 63 and each of the second structural members 64 is arranged at intervals.

[0070] S7. Demolding. UHPC has high early strength properties. Usually, about 6-18 hours after pouring (depending on the mix ratio and curing temperature), the concrete has reached demoulding strength (sufficient to support its own weight and maintain its shape). First, loosen and remove all bolts and nuts connecting the mold side formwork, carefully disassemble and remove each side formwork, remove the first structural member 63 and the second structural member 64, and take out the initial setting plate.

[0071] S8. Curing components: Immediately wrap the entire initially set slab tightly with a water-saturated geotextile (or specialized curing film) after demolding. Place the wrapped components in a cool, well-ventilated room (avoiding direct sunlight that could cause cracking) or a curing shed. Keep the wrapping material fully moist at all times. Regularly check and rehydrate the components to ensure they maintain a high-humidity environment. Continue static curing for at least 72 hours (3 days). A longer curing time (e.g., 7-14 days) promotes the development of higher strength, resulting in concrete slab 1.

[0072] S9. Install the extension bars 7. After the curing, the concrete slab 1 has sufficient hardness. At this time, the extension bars 7 are inserted into the transverse structural groove 61 along the length direction. It is necessary to ensure that the length of the two ends of the extension bars 7 protruding from the transverse edge of the component meets the design requirements to facilitate subsequent connection.

[0073] S10. After the extension ribs 7 are placed, stool ribs 8 are arranged below the bottom of each extension rib 7 at a certain interval (about 0.8-1.2 m) along the length direction thereof, ensuring that the side with the depression 81 on the top of the stool rib 8 faces upward.

[0074] In step S3 : a release agent is sprayed on the surfaces of the first structural member 63 and the second structural member 64 .

[0075] In step S4 : a clamping platform 31 for placing the end portion of the structural panel 3 is provided on the inner side of the side template corresponding to the two ends of the transverse rib 51 .

[0076] In step S7: after the initial setting plate is taken out, an air hammer or a jackhammer is used to break up the spacer layer below the longitudinal reinforcement.

[0077] In step S10: use thin iron wire to cross-tie and fix the upper leg of the stool reinforcement 8 with the longitudinal reinforcement 42 or other stabilizing reinforcement closest to it, to ensure that the position of the stool reinforcement 8 is stable and the extension reinforcement 7 will not shift during subsequent transportation and installation. After completing this step, the UHPC lightweight floor prefabricated component is obtained.

[0078] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A UHPC lightweight floor prefabricated component, comprising a concrete slab, characterized in that: A structural frame and at least one structural plate with plate holes distributed on the surface are provided inside the concrete slab, the structural plate is provided at the bottom of the structural frame, and the structural frame includes a plurality of longitudinal steel cages arranged in parallel in a triangular structure and a connecting bar group connecting each longitudinal steel cage; Each of the longitudinal reinforcement cages includes two inverted V-shaped wavy reinforcements and a longitudinal reinforcement located on top of the wavy reinforcements. A plurality of structural grooves are provided on the top of the concrete slab. Each of the structural grooves includes a transverse structural groove and a longitudinal structural groove arranged alternately. Each of the longitudinal structural grooves is parallel to each other and is respectively arranged between adjacent longitudinal reinforcement cages. Each of the transverse structural grooves is parallel to each other and is correspondingly arranged at the trough of the wavy reinforcement. The connecting reinforcement group includes a plurality of transverse reinforcements and a plurality of fixing parts. Each transverse reinforcement is arranged under the structural plate. Each fixing part is arranged at intervals along each transverse reinforcement. The top of each fixing part is connected to the longitudinal reinforcement cage, and the bottom of each fixing part passes through the plate hole on the structural plate and is connected to the corresponding transverse reinforcement.

2. The UHPC lightweight floor prefabricated component according to claim 1, characterized in that: Each of the fixing members is V-shaped, and both ends of each of the fixing members are in the shape of inverted hooks. After the bottom of each of the fixing members is hooked on the corresponding transverse reinforcement, the inverted hook is hung on the corresponding wavy reinforcement.

3. The UHPC lightweight floor prefabricated component according to claim 2, characterized in that: The two ends of the wavy curved reinforcement of the same longitudinal reinforcement cage are away from each other and extend in a direction parallel to the longitudinal reinforcement.

4. The UHPC lightweight floor prefabricated component according to claim 3, characterized in that: Both sides of each structural groove are inclined surfaces.

5. The UHPC lightweight floor prefabricated component according to claim 4, characterized in that: When the number of the structural plates exceeds one, the length direction of each structural plate is parallel to each transverse rib.

6. The UHPC lightweight floor prefabricated component according to claim 5, characterized in that: An extension rib is provided in each of the transverse structural grooves, and an end portion of each of the extension ribs protrudes out of the edge of the concrete slab.

7. The UHPC lightweight floor prefabricated component according to claim 6, characterized in that: A plurality of bench ribs are provided at the bottom of each extension rib, so that there is a gap between each extension rib and each transverse structural groove, and a recess for placing the extension rib is provided at the top of each bench rib.

8. A method for forming a UHPC lightweight floor prefabricated component, for preparing the UHPC lightweight floor prefabricated component according to claim 7, characterized in that: The steps include: S1. Set up the connecting reinforcement group, place the fixings at the corresponding position above the structural plate, lift the structural plate, pass the bottom of the fixings through the plate holes of the structural plate, and then install transverse reinforcement at the bottom of the fixings; S2. Assemble the mold, which includes four side templates connected end to end. Adjacent side templates are connected by bolts and nuts. The bolts are inserted into the connection holes at the ends of each side template and tightened with nuts. The side templates corresponding to the ends of the longitudinal reinforcement cage are provided with slots for accommodating the ends of the longitudinal reinforcement and the wavy curved reinforcement. S3. Spraying a release agent into the assembled mold; S4. Erect the structural frame, place the assembled connecting reinforcement group in the assembled mold, place the longitudinal reinforcement of the longitudinal reinforcement cage and the ends of the wavy curved reinforcement in the slots of the side template, and hang the hooks at both ends of the fixing parts on the wavy curved reinforcement; S5. Use ultra-high performance concrete for pouring; S6. Pre-setting the structural groove: Before the concrete has initially set, place a first structural member for forming the transverse structural groove and a second structural member for forming the longitudinal structural groove on the poured concrete and press downward. The first structural member is in the shape of an elongated strip with protrusions on both sides. The second structural member includes a plurality of structural blocks and connecting strips. The structural blocks are spaced apart below the connecting strips, and the first structural members are spaced apart from the second structural members. S7, demoulding, allowing the concrete to solidify naturally to form an initial setting slab, and then removing the initial setting slab from the mold; S8. Component curing: Wrap the initial setting slab with moistened geotextile and place it in a cool and ventilated place for more than 72 hours to obtain a concrete slab; S9. Insert the extension reinforcement into the transverse structural groove; S10. Set stool reinforcement at the bottom of the extension reinforcement to obtain a UHPC lightweight floor prefabricated component.

9. A method for forming a UHPC lightweight floor prefabricated component according to claim 8, characterized in that: In step S4: a clamping platform for placing the end portion of the structural plate is provided on the inner side of the side formwork corresponding to the two ends of the transverse reinforcement.

10. The method for forming a UHPC lightweight floor prefabricated component according to claim 8, characterized in that: In step S10: the bench reinforcement, longitudinal reinforcement and extension reinforcement are tied and fixed with wire.

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