Lightweight prefabricated laminated slab

Abstract

The invention belongs to the field of building prefabricated slabs, and particularly relates to a light-weight prefabricated laminated slab which comprises an inverted-T-shaped concrete prefabricated slab formed by pouring aerated concrete. Truss rib mechanisms are arranged in the concrete prefabricated slabs, the multiple concrete prefabricated slabs are tightly attached to form a prefabricated base, reinforcement cage parts are longitudinally arranged at the concave positions between the adjacent concrete prefabricated slabs on the prefabricated base, and triangular cone parts are arranged in all triangular rib structures located at the same transverse position on the prefabricated base in a penetrating mode. The triangular cone parts synchronously penetrate through the middle parts of all the reinforcement cage parts at the same transverse position; aerated concrete is adopted as a main body material of the prefabricated slab, the dead weight of the floor slab is remarkably reduced, and meanwhile the concrete consumption is reduced through the inverted-T-shaped structural design; the composite structure of the truss rib mechanism, the reinforcement cage part and the triangular cone part optimizes the use amount of reinforcing steel bars on the premise of ensuring the strength, so that materials are saved.

Description

Technical Field

[0001] The present invention belongs to the field of precast building panels, and particularly relates to a lightweight precast composite slab. Background Art

[0002] In the field of prefabricated buildings, precast composite floor slabs are widely used because they combine the efficiency of factory prefabrication and the integrity of cast-in-situ structures. Traditional composite floor slabs mostly adopt the combination of ordinary concrete precast layers and cast-in-situ layers, but there are the following technical defects:

[0003] 1. Conflict between lightweight and structural performance

[0004] Although conventional aerated concrete precast slabs have the advantages of light weight and heat insulation, their low compressive strength makes it difficult to directly use them as structural layers. In the prior art, for composite slabs using aerated concrete, additional external steel mesh is mostly used to compensate for the strength, but the additional reinforcement increases the self-weight of the components, and the bond strength between the steel bars and the aerated concrete interface is insufficient, resulting in easy peeling failure.

[0005] 2. Weak connection at the interface between precast and cast-in-situ

[0006] Traditional composite slabs rely on surface roughening or simple truss bars to achieve interface bonding. However, on the aerated concrete substrate, the vertical anchorage section of ordinary truss bars has low bite force with aerated concrete and cannot effectively transfer shear force; at the same time, the lap joint method of the steel cage at the splicing joint of the precast slab is rough, resulting in uneven distribution of the steel bars in the cast-in-situ layer and local stress concentration.

[0007] 3. Low production and construction efficiency of precast components

[0008] In the existing aerated concrete precast slabs, the internal steel bar skeletons mostly adopt the welding forming process. The joints of the welded truss bars are prone to microcracks due to thermal stress

[0009] which reduces the structural durability; at the same time, during the additional reinforcement process after the precast slabs are spliced, the traditional transverse connecting bars are straight bar structures, and complex binding operations are required to connect with the longitudinal bar group, making it difficult to achieve rapid assembly.

[0010] In order to ensure that the precast composite floor slab greatly improves the structural strength on the basis of being as lightweight as possible, and at the same time can facilitate the later rapid assembly construction, the present invention provides a lightweight precast composite slab. Summary of the Invention

[0011] In view of the above problems, a lightweight precast composite slab provided by an embodiment of the present application can reduce weight, improve construction efficiency, and enhance the structural strength of the composite floor slab.

[0012] To achieve the above object, the embodiments of the present application provide the following technical solutions: A lightweight precast composite slab, including a concrete precast slab cast into a convex shape with aerated concrete; a truss reinforcement mechanism is arranged inside the concrete precast slab, and the truss reinforcement mechanism includes two groups of longitudinal reinforcement groups arranged in parallel and forming a triangular structure, and a transverse reinforcement group for connecting the two groups of longitudinal reinforcement groups. The top of the longitudinal reinforcement group exposes the upper end face of the concrete precast slab to form a triangular rib structure.

[0013] A number of concrete precast slabs are placed closely to form a precast base. Reinforcement cage parts are longitudinally placed at the concave positions between adjacent concrete precast slabs on the precast base. A triangular cone part is inserted through all the triangular rib structures at the same transverse position on the precast base, and the triangular cone part is synchronously inserted through the middle parts of all the reinforcement cage parts at the same transverse position.

[0014] After all the reinforcement cage parts and triangular cone parts on the precast base are inserted and placed, concrete is poured to form a precast composite floor slab. After the precast composite floor slab is cured by pouring, the transverse reinforcement group and longitudinal reinforcement group of the concrete precast slab, together with the reinforcement cage parts and triangular cone parts, jointly form a steel reinforcement solid, and the steel reinforcement solid is located inside the precast composite floor slab.

[0015] According to a preferred embodiment, the longitudinal reinforcement group is composed of two integrally formed curved bars bent into a wavy structure and three round bars. The two curved bars are placed in a vertical inverted V shape. The peak positions on the two curved bars correspond one by one and are jointly welded with a round bar. All the trough positions on each curved bar are also jointly welded with a round bar. The three round bars are arranged in a triangular structure.

[0016] According to a preferred embodiment, the transverse reinforcement group is composed of a round bar two parallel to the longitudinal reinforcement group and located in the middle position between the two groups of longitudinal reinforcement groups, and auxiliary bars arranged along the length direction of the round bar two and welded to both sides of the round bar two. One end of the auxiliary bar close to the corresponding longitudinal reinforcement group is set in a hook shape, and the hook-shaped end is clamped and fixed with the corresponding round bar.

[0017] According to a preferred embodiment, positioning steel rods are welded on both sides of the round bar two close to the auxiliary bars, and the positioning steel rods on both sides of the auxiliary bar are symmetric to each other. The upper ends of the positioning steel rods expose the upper end face of the concrete precast slab.

[0018] According to a preferred embodiment, triangular support blocks for assisting in positioning the triangular cone part are clamped on the positioning steel rods exposed on the upper end faces of the two outermost concrete precast slabs distributed in the transverse direction on the precast base. Semi-circular limiting grooves are opened at each vertex position of the triangular support block. Two positioning holes for plugging and matching with the positioning steel rods are arranged on the lower end face of the triangular support block.

[0019] According to an advantageous embodiment, the triangular pyramid portion is composed of three circular ribs three, and the three circular ribs three are respectively clamped inside two opposite semi-circular limiting grooves at the same transverse position on the precast base.

[0020] According to an advantageous embodiment, the distance between two adjacent auxiliary ribs arranged along the length direction of the circular rib two is the same as the distance between two adjacent wave crests on the curved rib; the transverse rib group and the two longitudinal rib groups inside the precast concrete slab jointly form a uniform grid structure.

[0021] According to an advantageous embodiment, the steel reinforcement cage portion is composed of four circular ribs four arranged in a rectangle and several steel bar frames bent into a rectangular structure, and the four circular ribs four are respectively arranged at the inner corner ends of the steel bar frames; and the steel bar frames and the circular ribs four are tightly fixed by iron wires.

[0022] Compared with the prior art, a lightweight precast composite slab provided by an embodiment of the present invention has the following beneficial effects: 1. The present invention uses aerated concrete as the main material of the precast slab, significantly reducing the self-weight of the floor slab. At the same time, the use of concrete is reduced through the design of the convex-shaped structure; the composite structure of the truss bar mechanism, the steel reinforcement cage portion, and the triangular pyramid portion optimizes the amount of steel reinforcement on the premise of ensuring strength, realizing material saving.

[0023] 2. The present invention uses the inverted V-shaped corrugated rib of the longitudinal rib group and the triangular circular rib one to be welded to form a stable triangular truss structure, enhancing the longitudinal compressive and shear resistance; the transverse rib group is clamped and fixed to the longitudinal rib group through the hook-shaped auxiliary ribs to form a three-dimensional space stress system, dispersing stress; significantly improving the bending resistance, crack resistance and overall bearing capacity of the composite floor slab.

[0024] 3. The present invention can enhance the construction convenience and assembly accuracy. The positioning steel rod is exposed to facilitate the cooperation with the positioning hole of the triangular support block, facilitating the rapid positioning and installation of the triangular support block. Moreover, the setting of the triangular support block can realize the rapid and accurate positioning of the triangular pyramid portion, avoiding pouring deviation; the internal auxiliary rib hook structure and the spacing between the transverse rib group and the longitudinal rib group are matched, simplifying the precast slab assembly process, ensuring the tightness and consistency of modular splicing; and the steel reinforcement cage portion is embedded in the concave portion of the precast slab and is inserted and connected with the triangular pyramid portion, reducing the on-site welding process and improving the construction efficiency.

[0025] 4. The present invention can improve the structural durability and stability of the composite floor slab. The triangular rib structure is formed by the exposure of the top of the longitudinal rib group, forming a mechanical bite with the concrete in the casting layer to prevent the peeling of the formed concrete interface; the rectangular steel bar frame of the steel reinforcement cage portion is tied and fixed to the circular rib four to ensure the strength of the connection node and avoid local damage caused by stress concentration; the grid-shaped steel reinforcement reinforcement evenly distributes the load, inhibits the expansion of concrete shrinkage cracks, and extends the service life of the formed precast composite floor slab. Description of the Drawings

[0026] Figure 1 This is a three-dimensional structure diagram of the truss bar mechanism of the present invention.

[0027] Figure 2 This is a schematic diagram of the first position structure among the precast base, the steel reinforcement cage part, and the triangular pyramid part of the present invention.

[0028] Figure 3 This is a schematic diagram of the second position structure among the precast base, the steel reinforcement cage part, and the triangular pyramid part of the present invention.

[0029] Figure 4 This is a three-dimensional structure diagram of the longitudinal bar group of the present invention.

[0030] Figure 5 This is a cross-sectional view of the triangular support block of the present invention.

[0031] Reference numerals in the figure: 1, truss bar mechanism; 11, longitudinal bar group; 12, transverse bar group; 2, steel reinforcement cage part; 3, triangular pyramid part; 111, curved bar; 112, first round bar; 121, second round bar; 122, auxiliary bar; 123, positioning steel rod; 21, fourth round bar; 22, steel bar frame; 31, triangular support block; 32, third round bar. Detailed implementation manners

[0032] The following further elaborates on this application Figures 1-5 with reference to the accompanying drawings.

[0033] Please refer to Figure 1 , a lightweight precast composite slab, including a concrete precast slab cast into a convex shape with aerated concrete; during casting, the raised height is 1 / 3 - 1 / 2 of the thickness of the precast slab. A truss bar mechanism 1 is arranged inside the concrete precast slab. The truss bar mechanism 1 includes two groups of longitudinally arranged and triangular-structured longitudinal bar groups 11 and a transverse bar group 12 for connecting the two groups of longitudinal bar groups 11. The top of the longitudinal bar group 11 exposes above the upper end surface of the concrete precast slab to form a triangular bar structure; the separately arranged longitudinal bar group 11 and transverse bar group 12 can form a stable steel bar skeleton system, which is beneficial to improving the strength of the post-cast aerated concrete. By exposing the top of the longitudinal bar group 11 to form a triangular bar structure, mechanical interlocking is formed with the cast-in-place concrete layer to prevent the peeling of the formed concrete interface.

[0034] Please refer to Figure 2, several precast concrete slabs are placed closely to form a precast base. Reinforcement cage parts 2 are longitudinally placed at the concave positions between adjacent precast concrete slabs on the precast base. All triangular rib structures at the same transverse position on the precast base are penetrated by triangular pyramid parts 3, and the triangular pyramid parts 3 are synchronously penetrated through the middle parts of all the reinforcement cage parts 2 at the same transverse position. When filling the concave parts later, fine aggregate concrete is used and vibrated compactly with a vibrating rod. Through the staggered arrangement of the truss bar mechanism 1, the reinforcement cage parts 2 and the triangular pyramid parts 3, the amount of steel bars is optimized on the premise of ensuring strength, and at the same time, the connection strength between multiple precast concrete slabs is enhanced, greatly improving the structural strength of the formed precast composite floor slab.

[0035] Please refer to Figure 3 , after all the reinforcement cage parts 2 and triangular pyramid parts 3 on the precast base are penetrated and placed, concrete is poured to form a precast composite floor slab. Before pouring, an epoxy resin coating is further sprayed on the surfaces of all the internal steel bars for rust prevention treatment. When pouring, the thickness of the cast-in-place layer is controlled to be 80 mm. After forming, steam curing is required. After the precast composite floor slab is poured and cured, the transverse bar group 12 and longitudinal bar group 11 of the precast concrete slab and the reinforcement cage parts 2 and triangular pyramid parts 3 jointly form a steel bar reinforcement body, and this steel bar reinforcement body is located inside the precast composite floor slab.

[0036] Please refer to Figure 4 , the longitudinal bar group 11 is composed of two integrally formed curved bars 111 bent into a wavy structure and three round bars 112. The two curved bars 111 are placed in a vertical inverted V shape. The peak positions on the two curved bars 111 correspond one by one and are jointly welded with a round bar 112. All the trough positions on each curved bar 111 are also jointly welded with a round bar 112. The three round bars 112 are arranged in a triangular structure. The inverted V-shaped wavy curved bars 111 of the longitudinal bar group 11 and the triangular round bars 112 are welded to form a stable triangular truss structure, enhancing the longitudinal compressive and shear resistance performance.

[0037] Please refer to Figure 1 , the transverse bar group 12 is composed of round bars 121 parallel to the longitudinal bar group 11 and located in the middle position between two groups of longitudinal bar groups 11, and auxiliary bars 122 arranged along the length direction of the round bars 121 and welded to both sides of the round bars 121. One end of the auxiliary bar 122 close to the corresponding longitudinal bar group 11 is set in a hook shape, and the hook-shaped end is hooked and fixed with the corresponding round bar 112. The transverse bar group 12 is hooked and fixed with the longitudinal bar group 11 through the hook-shaped auxiliary bars 122 to form a three-dimensional space stress system and disperse stress. At the same time, the hooking and fixing can greatly improve the construction efficiency.

[0038] Please refer to Figure 1, positioning steel rods 123 are welded at positions on the circular rib 121 near both sides of the auxiliary rib 122, and the positioning steel rods 123 on both sides of the auxiliary rib 122 are symmetrical to each other; the upper ends of the positioning steel rods 123 protrude from the upper end surface of the precast concrete slab; the purpose of the upper ends of the positioning steel rods 123 protruding is to facilitate the placement of the triangular support blocks 31 in the later stage to quickly support and fix the triangular cone part 3.

[0039] In order to improve the fixing efficiency of the triangular cone part 3 while ensuring that the internal steel bar reinforcement will not loosen during the process of pouring concrete to form the precast composite floor slab, and at the same time reduce the construction difficulty and improve the construction efficiency, please refer to Figure 2 , triangular support blocks 31 for assisting in positioning the triangular cone part 3 are clamped on the positioning steel rods 123 protruding from the upper end surfaces of the two outermost precast concrete slabs distributed in the transverse direction on the precast base; please refer to Figure 3 and Figure 5 , semi-circular limiting grooves are provided at each vertex position of the triangular support block 31; two positioning holes for plugging and matching with the positioning steel rods 123 are provided on the lower end surface of the triangular support block 31; the triangular cone part 3 is composed of three circular ribs 32, and the three circular ribs 32 are respectively clamped inside the opposite two semi-circular limiting grooves at the same transverse position on the precast base.

[0040] Before pouring concrete to form the precast composite floor slab, by placing the triangular support blocks 31 on the two outermost precast concrete slabs distributed in the transverse direction on the precast base and aligning the positioning holes on the triangular support blocks 31 with the positioning steel rods 123 by plugging, on the one hand, the installation efficiency can be guaranteed, and at the same time, it can be ensured that the three circular ribs 32 to be penetrated are parallel and corresponding to each other, and the three maintain a regular triangular pyramid structure; ensure a strong mechanical bite with the later concrete pouring layer to prevent the formed concrete interface stress from being uneven and peeling off.

[0041] Please refer to Figure 1 , the distance between two adjacent auxiliary ribs 122 arranged along the length direction of the circular rib 121 is the same as the distance between two adjacent wave crests on the curved rib 111; the transverse rib group 12 and the two longitudinal rib groups 11 inside the precast concrete slab together form a uniform grid structure; the formed grid-shaped steel bar reinforcement is beneficial to evenly distribute the load-bearing of the precast slab, inhibit the expansion of concrete shrinkage cracks, and extend the service life of the formed precast composite floor slab.

[0042] Please refer to Figure 2, the steel reinforcement cage part 2 is composed of four circular steel bars 21 arranged in a rectangle and several steel bar frames 22 bent into a rectangular structure arranged at intervals of 150 mm. The four circular steel bars 21 are correspondingly arranged at the inner corner ends of the steel bar frames 22; and the steel bar frames 22 and the circular steel bars 21 are tightly fixed by wire; after binding, it is necessary to paint the steel reinforcement cage with antirust paint. The rectangular steel bar frames 22 of the steel reinforcement cage part 2 and the circular steel bars 21 are bound and fixed to ensure the strength of the connection nodes and avoid local damage caused by stress concentration; and the steel reinforcement cage part 2 is arranged at the concave part between adjacent concrete precast slabs, and the splicing joint position is reinforced, greatly improving the structural strength of the overall formed concrete precast slab.

[0043] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A lightweight prefabricated composite panel, comprising a prefabricated concrete panel cast in a convex shape by aerated concrete; characterized in that: A truss bar mechanism is arranged inside the concrete precast panel, and the truss bar mechanism includes two sets of longitudinal bar groups arranged in parallel and forming a triangular structure, and a transverse bar group used to connect the two sets of longitudinal bar groups, and the top of the longitudinal bar group is exposed from the upper end surface of the concrete precast panel to form a triangular bar structure; A plurality of concrete precast panels are placed closely together to form a precast base, and steel cages are longitudinally placed at the recessed positions between adjacent concrete precast panels on the precast base, and triangular cones are inserted through all triangular reinforcement structures at the same transverse position on the precast base, and the triangular cones are synchronously inserted through the middle of all steel cages at the same transverse position; All the steel cage parts and triangular cone parts on the prefabricated base are penetrated and placed, and then concrete is poured to form a prefabricated composite floor slab. After the prefabricated composite floor slab is poured and solidified, the transverse reinforcement group, the longitudinal reinforcement group of the concrete prefabricated slab, the steel cage parts and the triangular cone parts together form a steel reinforcement body, and the steel reinforcement body is located inside the prefabricated composite floor slab.

2. A lightweight prefabricated composite panel according to claim 1, characterized in that: The longitudinal rib group is composed of two integrally formed curved ribs bent into a wave-shaped structure and three round ribs; the two curved ribs are arranged in a vertical inverted V shape; the wave crest positions on the two curved ribs correspond to each other and are welded with a round rib, and all the wave trough positions on each curved rib are also welded with a round rib, and the three round ribs are arranged in a triangular structure.

3. A lightweight prefabricated composite panel according to claim 2, characterized in that: The transverse rib group is composed of a round rib two parallel to the longitudinal rib group and located in the middle of the two longitudinal rib groups, and auxiliary ribs arranged along the length direction of the round rib two and welded on both sides of the round rib two; the auxiliary rib is arranged in a hook shape at one end close to the corresponding longitudinal rib group, and the hook-shaped end is hooked and fixed to the corresponding round rib one.

4. A lightweight prefabricated composite panel according to claim 3, characterized in that: Positioning steel rods are welded on the second round reinforcement near the two sides of the auxiliary reinforcement, and the positioning steel rods on both sides of the auxiliary reinforcement are symmetrical to each other; the upper ends of the positioning steel rods are exposed from the upper end surface of the concrete precast plate.

5. A lightweight prefabricated composite panel according to claim 4, characterized in that: The exposed positioning steel rods on the upper end surfaces of the two outermost concrete precast panels distributed in the transverse direction on the precast base are clamped with triangular support blocks for assisting the positioning of the triangular cone; a semi-arc limiting groove is provided at each vertex position of the triangular support block; and two positioning holes are provided on the lower end surface of the triangular support block for plugging and cooperating with the positioning steel rods.

6. A lightweight prefabricated composite panel according to claim 5, characterized in that: The triangular cone portion is composed of three circular ribs three, and the three circular ribs three are correspondingly clamped in the inside of two opposite semi-arc limiting grooves at the same transverse position on the prefabricated base.

7. The lightweight prefabricated composite panel according to claim 3, characterized in that: The spacing between two adjacent auxiliary reinforcements arranged along the length direction of the circular reinforcement is consistent with the distance between two adjacent wave peaks on the curved reinforcement; the transverse reinforcement group and the two longitudinal reinforcement groups inside the concrete precast panel together form a uniform grid structure.

8. The lightweight prefabricated composite panel according to claim 1, characterized in that: The steel cage is composed of four round bars four arranged in a rectangular shape and a plurality of steel frames bent in a rectangular structure. The four round bars four are arranged one by one at the inner corner ends of the steel frame; and the steel frame and the round bars four are tightened and fixed by iron wire.

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