UHPC light floor prefabricated part and forming method thereof

Abstract

The invention relates to the technical field of building prefabricated slabs, provides a UHPC light floor slab prefabricated part and a forming method thereof, and solves the problems that an existing prefabricated slab is insufficient in bonding strength of a bonding surface, large in weight, low in strength and low in site construction efficiency. The concrete plate comprises a concrete plate body, structural frames and at least one structural plate with plate holes distributed in the surface are arranged in the concrete plate body at intervals, a plurality of structural grooves are formed in the top of the concrete plate body and comprise transverse structural grooves and longitudinal structural grooves, the transverse structural grooves and the longitudinal structural grooves are arranged in a staggered mode, and the longitudinal structural grooves are parallel to one another. The transverse structure grooves are parallel to one another; the transverse and longitudinal structural grooves are formed in the top of the concrete slab body to form a regular'key groove 'system, and when a concrete laminated layer is subsequently poured on site, new concrete is embedded into the grooves to form strong engagement, so that a prefabricated part and a cast-in-place layer are combined into a firm whole.

Description

Technical Field

[0001] The present invention relates to the technical field of building precast slabs, and particularly relates to a UHPC lightweight floor precast component and a forming method thereof. Background Art

[0002] In the field of prefabricated buildings, precast composite floors are widely used because they combine the efficiency of factory prefabrication and the integrity of cast-in-situ structures. Traditional composite floors mostly adopt the combination of a common concrete precast layer and a cast-in-situ layer. The composite slabs are produced in factories and are conveniently installed on site, which can significantly shorten the construction period and improve construction efficiency. However, due to the insufficient bonding strength of the bonding surface between the precast layer and the cast-in-situ layer, peeling failure is likely to occur.

[0003] In the prior art, although aerated concrete precast slabs can achieve light weight and heat insulation at the same time, due to the material defects of aerated concrete, it is difficult to directly use them as a structural layer. To compensate for the strength of aerated concrete composite slabs, external steel bar frames are usually added. However, due to the insufficient connection strength between the steel bars in the added part and the concrete in the precast slab body, the weight is large and the strength is low. The added steel bar frames require complex binding steps, resulting in low on-site construction efficiency. Summary of the Invention

[0004] A UHPC lightweight floor precast component includes a concrete slab body. Structural frames and at least one structural plate with plate holes distributed on the surface are arranged at intervals inside the concrete slab body. The structural plate is arranged at the bottom of the structural frame. The structural frame includes a plurality of longitudinal steel bar cages arranged in a triangular structure and parallel to each other, and a connecting bar group connecting each longitudinal steel bar cage. Each longitudinal steel bar cage includes two wavy curved bars arranged in an inverted V shape and a longitudinal bar arranged at the top of the wavy curved bars. A plurality of structural grooves are arranged at the top of the concrete slab body. Each structural groove includes transverse structural grooves and longitudinal structural grooves arranged alternately. The longitudinal structural grooves are parallel to each other and are respectively arranged between adjacent longitudinal steel bar cages. The transverse structural grooves are parallel to each other and are correspondingly arranged at the troughs of the wavy curved bars. The connecting bar group includes a plurality of transverse bars and a plurality of fixing pieces. Each transverse bar is arranged below the structural plate. The fixing pieces are arranged at intervals along each transverse bar. The top of each fixing piece is connected to the longitudinal steel bar cage, and the bottom of each fixing piece passes through the plate hole on the structural plate and is connected to the corresponding transverse bar.

[0005] Further, each fixing piece is V-shaped, and both ends of each fixing piece are in an inverted hook shape. After the bottom of each fixing piece is hooked on the corresponding transverse bar, the inverted hook is hung on the corresponding wavy curved bar.

[0006] Further, the two ends of the wavy curved bars of the same longitudinal steel bar cage are far away from each other and extend in the direction parallel to the longitudinal bar.

[0007] Further, both sides of each of the structural grooves are beveled surfaces.

[0008] Further, when the number of the structural plates exceeds one, the length directions of the structural plates are parallel to the transverse ribs.

[0009] Further, extension ribs are arranged in each of the transverse structural grooves, and the ends of the extension ribs protrude out of the edge of the concrete slab.

[0010] Further, a plurality of stool ribs are arranged at the bottom of each of the extension ribs, so that there is a gap between each of the extension ribs and each of the transverse structural grooves, and a depression for placing the extension ribs is arranged at the top of each of the stool ribs.

[0011] A forming method for a precast UHPC lightweight floor slab member, which is used to prepare the above-mentioned precast UHPC lightweight floor slab member, includes the following steps: S1. Erect a connecting rib group, place a fixing member at the corresponding position above the structural plate, lift the structural plate, pass the bottom of the fixing member through the plate holes of the structural plate, and then pass a transverse rib through the bottom of the fixing member; S2. Assemble a mold, the mold includes four side templates connected end to end in sequence, and adjacent side templates are connected by bolts and nuts. Pass the bolts into the connecting holes at the ends of each side template and lock them with nuts. Card slots for placing the ends of the longitudinal steel bars and the corrugated steel bars are arranged on the side templates corresponding to the two ends of the longitudinal steel cage; S3. Spray a release agent in the assembled mold; S4. Erect a structural frame, place the erected connecting rib group in the assembled mold, place the ends of the longitudinal steel bars and the corrugated steel bars of the longitudinal steel cage in the card slots of the side templates, and hang the barbs at both ends of the fixing member on the corrugated steel bars; S5. Pour with ultra-high performance concrete; S6. Preset structural grooves. Before the concrete begins to set, place a first structural member for forming a transverse structural groove and a second structural member for forming a longitudinal structural groove on the poured concrete and press them down. The first structural member is strip-shaped, convex blocks are arranged on both sides of the first structural member, the second structural member includes a plurality of structural blocks and connecting bars, the structural blocks are arranged at intervals below the connecting bars, and the first structural members and the second structural members are arranged at intervals; S7. Demold, let the concrete solidify naturally to form a primary setting slab, and take out the primary setting slab from the mold; S8. Cure the member, wrap the primary setting slab with a wet geotextile and place it in a cool and ventilated place, and let it stand for more than 72h to obtain a concrete slab; S9. Pass the extension ribs through the transverse structural grooves; S10. Set stool bars at the bottom of the extended bars to obtain a precast UHPC lightweight floor slab component.

[0012] Further, in step S4: There are clamping platforms for placing the ends of the structural slab on the inner sides of the side forms corresponding to both ends of the transverse bars.

[0013] Further, in step S10: Tie and fix the stool bars, longitudinal bars and extended bars with iron wires.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention adopts a longitudinal steel cage with an internal triangular structure (two wavy curved bars + top longitudinal bars) to form a space truss structure, providing strong bending and shear resistance capabilities, significantly improving the bearing capacity and anti-deformation performance of the floor slab, eliminating the on-site steel bar tying link, accelerating the construction efficiency, canceling the longitudinal bar settings on both sides at the bottom of the wavy curved bars to reduce the weight ratio of the steel bars, and through the setting of the structural slab, it is used to supplement the structural strength of the wavy curved bars at the wave crests.

[0015] 2. The present invention sets transverse and longitudinal structural grooves on the top of the concrete slab to form a regular "key groove" system. When pouring the subsequent concrete composite layer on-site, the new concrete is embedded in the grooves to form a strong bite, making the precast part and the cast-in-place layer combine into a firm whole, ensuring the integrity and co-action of the floor slab.

[0016] 3. The connecting bar group (transverse bar + fixing part) adopted by the present invention not only connects each longitudinal steel cage into an integral framework, but also firmly connects it to the transverse bar below through the plate holes of the structural slab, ensuring the coordinated work and stability of the entire internal skeleton. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the concrete slab in the first embodiment of the present invention; Figure 2 It is a schematic structural diagram of the structure frame connection in the first embodiment of the present invention; Figure 3 It is a schematic structural diagram of the longitudinal structural groove setting in the first embodiment of the present invention; Figure 4 It is a schematic structural diagram of the transverse structural groove setting in the first embodiment of the present invention; Figure 5 It is a schematic structural diagram of the stool bar setting in the first embodiment of the present invention; Figure 6 It is a schematic structural diagram of the setting of the first structural member and the second structural member in the second embodiment of the present invention; Figure 7 It is a schematic cross-sectional structural diagram of the first structural member and the second structural member in the second embodiment of the present invention.

[0018] Explanation of the reference numerals in the drawings: Concrete slab 1; Structure frame 2; Structure slab 3; Longitudinal steel reinforcement cage 4; Wavy bent bars 41; Straight segments 411; Longitudinal bars 42; Connecting bar group 5; Transverse bars 51; Fixing parts 52; Structure groove 6; Transverse structure groove 61; Longitudinal structure groove 62; First structural member 63; Protrusions 631; Second structural member 64; Structural blocks 641; Connecting bars 642; Extension bars 7; Stool bars 8; Depressions 81. Specific implementation mode

[0019] The following will combine specific embodiments to elaborate in detail on the implementation mode of the present invention, so as to fully understand how the present invention uses technical means to solve technical problems and the implementation process of achieving technical effects, and to implement accordingly.

[0020] Embodiment 1: As Figures 1 to 5 shown, a precast UHPC lightweight floor slab member includes a concrete slab 1, and a structure frame 2 and at least one structure slab 3 with plate holes distributed on the surface are arranged at intervals inside the concrete slab 1. The structure slab 3 is arranged at the bottom of the structure frame 2. The structure frame 2 includes a number of longitudinal steel reinforcement cages 4 arranged in a triangular structure and parallel to each other, and a connecting bar group 5 connecting each longitudinal steel reinforcement cage 4. The longitudinal steel reinforcement cage 4 is the "backbone" of the whole member, bearing the main bending and shear stresses.

[0021] The plate holes on the structure slab 3 can be circular, triangular, honeycomb-shaped, square, etc. In this embodiment, the plate holes are circular.

[0022] Each longitudinal steel reinforcement cage 4 includes two wavy bent bars 41 arranged in an inverted V shape and a longitudinal bar 42 arranged at the top of the wavy bent bars 41. Usually, they are cold-rolled ribbed steel bars or threaded steel bars. The two wavy bent bars 41 are close but do not intersect in the top area. The longitudinal bar 42 is firmly fixed at the top peak intersection of the two wavy bent bars 41 by spot welding or binding. The two ends of the two wavy bent bars 41 of the same longitudinal steel reinforcement cage 4 are bent away from each other and finally extend into straight segments 411 parallel to the top longitudinal bar 42. This design greatly strengthens the structural integrity at both ends of the member, facilitating connection with adjacent members or beam columns, and during production, the ends of the wavy bent bars 41 and the longitudinal bar 42 can be fixed to the formwork together to ensure the stability of the longitudinal steel reinforcement cage 4 during the pouring process.

[0023] The connecting rib group 5 includes a plurality of transverse ribs 51 (usually perpendicular to the direction of the longitudinal steel cage 4) and a plurality of fixing members 52. Each of the transverse ribs 51 is arranged below the structural slab 3. The fixing members 52 are arranged at intervals along each of the transverse ribs 51. The top of each fixing member 52 is connected to the longitudinal steel cage 4, and the bottom of each fixing member 52 passes through the plate holes on the structural slab 3 and is connected to the corresponding transverse rib 51.

[0024] Each of the fixing members 52 is V-shaped, and the two ends of each fixing member 52 are in the shape of inverted hooks. After the bottom of each fixing member 52 is hooked on the corresponding transverse rib 51, the inverted hooks are hung on the corresponding corrugated bars 41.

[0025] The fixing members 52 are arranged at one corresponding to each wave trough along the length direction of the transverse rib 51. Its working process is as follows: the bottom of the fixing member 52 is hooked on the corresponding transverse rib 51, and the inverted hook-shaped structures on both sides of the top (the open end of the V shape) of the fixing member 52 are hung down on the corrugated bars 41 of the longitudinal steel cage 4 (preferably hung near the wave trough position or straddling two wave bars). This "one hook and one hang" method realizes the efficient and firm connection of the longitudinal steel cage 4 → the fixing member 52 → the transverse rib 51, without complex binding or welding, ensuring the stable and coordinated work of the entire skeleton in space.

[0026] A plurality of structural grooves 6 are provided on the top of the concrete slab body 1. Each of the structural grooves 6 includes transverse structural grooves 61 and longitudinal structural grooves 62 arranged alternately. 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 wave troughs of the corrugated bars 41, forming regular grid-shaped "key grooves".

[0027] Both sides of each of the structural grooves 6 are inclined planes, and this design is the core of generating a strong mechanical biting force with the cast-in-place concrete subsequently.

[0028] After laying the precast floor slab components at the construction site, a composite cast-in-place layer is poured on its top surface. The cast-in-place concrete will fully flow into and fill these structural grooves 6. After solidification, the inclined plane structure greatly increases the contact friction area and interlocking effect between the new and old concretes, forming an efficient shear key, ensuring that the precast layer and the cast-in-place layer become a firm whole, resisting horizontal shear forces (such as seismic actions), effectively preventing the peeling of the joint surface, and enhancing the integrity and continuity of the floor slab.

[0029] In this embodiment, the structural slab 3 is arranged corresponding to the wave troughs of the corrugated bars 41, the transverse ribs 51 are correspondingly arranged with the structural slab 3, and the length direction of each of the structural slabs 3 is parallel to that of each of the transverse ribs 51.

[0030] The transverse reinforcement bars 51 are connected to the upper longitudinal steel reinforcement cage 4 through dense fixing members 52, forming an overall restraint on the structural slab and a reliable force transmission path, further ensuring the structural efficiency and overall stability of the lightweight structural slab 3 in the precast component.

[0031] This application does not specifically limit the number of structural grooves 6, which can be adjusted according to the actual situation.

[0032] Extension bars 7 are provided in each of the transverse structural grooves 61, and the ends of the extension bars 7 protrude beyond the edge of the concrete slab body 1.

[0033] Different from the transverse reinforcement bars provided in the existing precast slabs, the transverse reinforcement bars 51 of this application are arranged at a position with a relatively low height in the cross-section of the slab body. After opening holes in the mold to place the transverse reinforcement bars 51, the sealing cost is relatively high. If the transverse reinforcement bars 51 are not extended to both sides of the concrete slab body 1, the connection strength between the slab body and the cast-in-place layer in the two lateral directions is slightly insufficient. The design of the extension bars 7 reserves sufficient lapping or mechanical connection lengths for connecting with the corresponding extension bars 7 of adjacent components on site to transfer negative bending moments and lateral tensile forces in the case of canceling the extension of the transverse reinforcement bars to both sides of the concrete slab body 1.

[0034] To ensure that there is a sufficient concrete cover thickness at the bottom of the extension bars 7 and prevent them from sinking, a number of stool bars 8 are arranged at intervals along the length direction at their bottoms. The tops of the stool bars 8 are processed with depressions 81 matching the diameters of the extension bars 7 for precisely placing and positioning the extension bars 7.

[0035] The designed height of the stool bars 8 forms a constant designed interval between the extension bars 7 placed in the depressions and the bottom surface of the transverse structural groove 61. This interval, after subsequent casting-in-place, constitutes the effective cover thickness of the extension bars 7 in the final composite floor slab. The stool bars 8 can be tied and fixed to the upper longitudinal bars 42 or nearby steel bars with wire.

[0036] Embodiment 2: As Figures 6 to 7 shown, a forming method for a UHPC lightweight floor precast component for preparing the UHPC lightweight floor precast component described in Embodiment 1 includes the following steps: S1. Set up the connecting bar group 5, place the fixing member 52 at the corresponding position above the structural slab 3, lift the structural slab 3, pass the bottom of the fixing member 52 through the slab holes of the structural slab 3, and then thread the transverse reinforcement bar 51 through the bottom of the fixing member 52.

[0037] S2. Assemble the mold. The mold includes four side templates (not shown in the figure) that are connected end to end in sequence. Adjacent side templates are connected by bolts and nuts. Insert the bolts into the connection holes at the ends of each side template and lock them with nuts. On the side templates corresponding to both ends of the longitudinal steel cage, there are slots (not shown in the figure, which is an existing design) for placing the ends of the longitudinal bars and the corrugated bars. The settings of the side templates, bolts, nuts, and slots are all prior arts and will not be elaborated here.

[0038] S3. Spray mold release agent inside the assembled mold.

[0039] S4. Erect the structural frame 2. Place the completed connection bar group 5 inside the assembled mold. Place the ends of the longitudinal bars 42 and the corrugated bars 41 of the longitudinal steel cage 4 in the slots of the side templates, and hang the barbs at both ends of the fixing member 52 on the corrugated bars 41.

[0040] S5. Pour with ultra-high performance concrete (UHPC) with appropriate fluidity (the slump is usually between 600 - 750 mm). The pouring process should be as follows: Divide the mold lengthwise into sections to ensure that the concrete covers all the steel bars, especially in the slot area, the fixing member 52 area, and the holes in the structural slab 3. Use a small vibrator (such as an internal or external vibrator) to vibrate moderately (avoid over-vibrating). The main purpose is to expel large air bubbles and ensure that the concrete completely fills the mold. Pay special attention to the area under the structural slab 3 and the areas where the steel bars are dense (such as around the wave troughs). The vibration time needs to be strictly controlled to prevent segregation or steel bar displacement.

[0041] S6. Preset the structural grooves 6. This is carried out when the UHPC has been poured and the concrete has not yet set (still has plasticity, usually within 20 - 60 minutes after pouring, depending on the ambient temperature and the UHPC formula). Place 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 on the poured concrete and press them down. The first structural member 63 is in a long strip shape, and there are convex blocks 631 on both sides of the first structural member 63. The second structural member 64 includes several 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 are arranged at intervals.

[0042] S7. Demold. UHPC has very high early strength performance. Usually, about 6 - 18 hours after pouring (specifically depending on the mix ratio and curing temperature), the concrete has reached the demolding strength (sufficient to support its own weight and maintain its shape). First, loosen and remove all the bolts and nuts used to connect the side templates of the mold, carefully disassemble and remove each side template, remove the first structural member 63 and the second structural member 64, and take out the initial-set slab.

[0043] S8. Component curing: Immediately after demolding, wrap the initial-set slab body tightly with a wet geotextile (or special curing film) saturated with water to wrap the entire initial-set slab body. Place the wrapped component in a cool and well-ventilated indoor area (to avoid cracking caused by direct sunlight) or curing shed, and keep the wrapping material always fully moist. Regularly check and replenish water to ensure that the component is in a high-humidity environment. The continuous static curing time shall not be less than 72 hours (3 days). A longer curing time (such as 7 - 14 days) is beneficial to the development of higher strength, and the concrete slab body 1 is obtained.

[0044] S9. Install the extension bars 7: After curing, the concrete slab body 1 has sufficient hardness. At this time, insert the extension bars 7 into the slots along the length direction of the transverse structural slots 61, and ensure that the lengths of both ends of the extension bars 7 protruding from the transverse edges of the component meet the design requirements for subsequent connection.

[0045] S10. After placing the extension bars 7, arrange the stool bars 8 at a certain interval (about 0.8 - 1.2 m) along the length direction under the bottom of each extension bar 7, and ensure that the side of the stool bar 8 with the depression 81 on the top faces upward.

[0046] In step S3: Spray the release agent on the surfaces of the first structural member 63 and the second structural member 64.

[0047] In step S4: On the inner sides of the side forms corresponding to both ends of the transverse bars 51, there are clamping platforms 31 for placing the ends of the structural plates 3.

[0048] In step S7: After taking out the initial-set slab body, use a pneumatic hammer or pickaxe to break up the spacer layer under the longitudinal bars.

[0049] In step S10: Use thin iron wire to cross-bind and fix the upper legs of the stool bars 8 reliably with the longitudinal bars 42 or other stable steel bars closest to them above to ensure the stable position of the stool bars 8, so that the extension bars 7 will not shift during subsequent transportation and installation. After completing this step, the UHPC lightweight floor precast component is obtained.

[0050] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all of them are within the protection scope of the present invention.

Claims

1. A precast UHPC lightweight floor slab component, including a concrete slab body, characterized in that, Inside the concrete slab body, a structural frame and at least one structural plate with plate holes distributed on the surface are arranged at intervals. The structural plate is arranged at the bottom of the structural frame. The structural frame includes several longitudinal steel cages in a triangular structure and arranged in parallel with each other, and a connecting bar group connecting each longitudinal steel cage; Each longitudinal steel cage includes two wavy curved bars placed in an inverted V shape and a longitudinal bar arranged at the top of the wavy curved bars. Several structural grooves are arranged at the top of the concrete slab body. Each structural groove includes a transverse structural groove and a longitudinal structural groove arranged alternately. Each longitudinal structural groove is parallel to each other and is respectively arranged between adjacent longitudinal steel cages. Each transverse structural groove is parallel to each other and is correspondingly arranged at the trough of the wavy curved bars; The connecting bar group includes several transverse bars and several fixing pieces. Each transverse bar is arranged below the structural plate. Each fixing piece is arranged at intervals along each transverse bar. The top of each fixing piece is connected to the longitudinal steel cage, and the bottom of each fixing piece passes through the plate hole on the structural plate and is connected to the corresponding transverse bar.

2. The precast member of a UHPC lightweight floor slab according to claim 1, wherein: Each fixing piece is V-shaped, and both ends of each fixing piece are in an inverted hook shape. After the bottom of each fixing piece is hooked on the corresponding transverse bar, the inverted hook is hung on the corresponding wavy curved bar.

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

4. A precast UHPC lightweight floor slab component according to claim 3, characterized in that: Both sides of each structural groove are inclined planes.

5. The precast member of a UHPC lightweight floor slab according to claim 4, characterized in that: When the number of structural plates exceeds one, the length direction of each structural plate is parallel to each transverse bar.

6. The precast component of a UHPC lightweight floor slab according to claim 5, characterized in that: Extension bars are arranged in each transverse structural groove, and the ends of each extension bar protrude out of the edge of the concrete slab body.

7. The precast member of a UHPC lightweight floor slab according to claim 6, characterized in that: Several stool bars are arranged at the bottom of each extension bar, so that there is an interval between each extension bar and each transverse structural groove. A depression for placing the extension bar is arranged at the top of each stool bar.

8. A forming method for precast UHPC lightweight floor slab components, which is used to prepare the precast UHPC lightweight floor slab components described in claim 7, characterized in that, Including the following steps: S1. Set up the connecting bar group, place the fixing pieces at the corresponding positions above the structural plate, lift the structural plate, pass the bottom of the fixing piece through the plate hole of the structural plate, and then pass a transverse bar through the bottom of the fixing piece; [[ID=II]]S2. Assemble the mold. The mold includes four side templates connected end to end in sequence. Adjacent side templates are connected by bolts and nuts. Pass the bolts into the connection holes at the ends of each side template and lock them with nuts. Grooves for placing the ends of the longitudinal bar and the wavy curved bar are arranged on the side templates corresponding to both ends of the longitudinal steel cage; S3. Spray a release agent in the assembled mold; S4. Set up the structural frame, place the completed connecting bar group in the assembled mold, place the ends of the longitudinal bar and the wavy curved bar of the longitudinal steel cage in the grooves of the side templates, and hang the inverted hooks at both ends of the fixing piece on the wavy curved bar; S5. Pour with ultra-high performance concrete; S6. Preset the structural grooves. Before the concrete starts to set, place the first structural member for forming the transverse structural groove and the second structural member for forming the longitudinal structural groove on the poured concrete and press them down. The first structural member is in a long strip shape, and convex blocks are arranged on both sides of the first structural member. The second structural member includes several structural blocks and connecting bars. Each structural block is arranged at intervals below the connecting bar. Each first structural member and each second structural member are arranged at intervals; S7. Demould, allow the concrete to solidify naturally to form an initial-set slab, and take out the initial-set slab from the mold; S8. Component curing, wrap the initial-set slab with a wet geotextile and place it in a cool and ventilated place, and let it stand for more than 72 hours to obtain a concrete slab; S9. Pass the extension bars through the transverse structural grooves; S10. Set stool bars at the bottom of the extension bars to obtain a precast UHPC lightweight floor slab component.

9. A forming method for a precast UHPC lightweight floor slab component according to claim 8, characterized in that, In step S4: There are clamping platforms for placing the ends of the structural plates on the inner sides of the side forms corresponding to both ends of the transverse bars.

10. A forming method of a precast UHPC lightweight floor slab component according to claim 8, characterized in that, In step S10: Tie and fix the stool bars, longitudinal bars and extension bars with iron wires.

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