Multi-layer and multi-direction lengthened prestressed reinforcement and common reinforced concrete hollow slab

Abstract

A prestressed reinforced concrete hollow slab technology is a relatively mature technology and has been widely applied to various constructional engineering. However, the technology is eliminated due to the own defects. The utility model discloses a multi-layer and multi-direction lengthened prestressed reinforcement and common reinforced concrete hollow slab, belongs to the field of constructional engineering, and provides a new method. The problem that the integrity is poor due to the fact that traditional prestressed reinforced concrete hollow slabs and other components of the same floor cannot be reliably connected with each other can be solved. Longitudinal prestressed steel bars at the bottoms of the traditional prestressed reinforced concrete hollow slabs are lengthened by a certain length at the two ends of the hollow slabs respectively. Lengthened longitudinal steel bars on the upper layer, transverse steel bars extending out of the width of the hollow slabs on the upper layer and the lower layer and stirrups in concrete ribs between two holes are added, so that the lengthened steel bars of all the hollow slabs are reliably connected with other components on the same floor and anchored in concrete of a beam or a wall; therefore, the integrity and earthquake resistance of the building are greatly improved.

Description

TECHNICAL FIELD

[0001] The patent relates to the field of building engineering BACKGROUND

[0002] The prestressed reinforced concrete hollow slab technology is a relatively mature technology, which is widely used in various building engineering because of its simple construction, fast speed, large span, labor and material saving, factory prefabrication and good quality. However, due to its own shortcomings, such as: each prestressed reinforced concrete hollow slab cannot be reliably and firmly connected with other prestressed reinforced concrete hollow slabs adjacent to its side surface; each prestressed reinforced concrete hollow slab end cannot be reliably and firmly connected with the wall or beam on which it is placed; and each prestressed reinforced concrete hollow slab side surface cannot be reliably and firmly connected with the adjacent ring beam or edge beam or wall. These shortcomings result in poor overall performance of the floor using prestressed reinforced concrete hollow slabs, and further result in poor seismic performance. This leads to the gradual elimination of the prestressed reinforced concrete hollow slab technology. CONTENT OF THE INVENTION

[0003] Patent content:

[0004] The purpose of the multi-layer, multi-directionally lengthened prestressed reinforced concrete hollow slab of the patent is to provide an innovative method to solve the problem that each prestressed reinforced concrete hollow slab side surface cannot be reliably and firmly connected with other prestressed reinforced concrete hollow slabs adjacent to it, each prestressed reinforced concrete hollow slab end cannot be reliably and firmly connected with the wall or beam on which it is placed, and each prestressed reinforced concrete hollow slab side surface cannot be reliably and firmly connected with the adjacent ring beam or edge beam or wall. The multi-layer, multi-directionally lengthened prestressed reinforced concrete hollow slab can solve the above-mentioned many shortcomings. When installing, after the multi-layer, multi-directionally lengthened prestressed reinforced concrete hollow slab is hoisted into position, the multi-layer, multi-directionally lengthened prestressed reinforced concrete hollow slab can be reliably connected with other components adjacent to it in the same floor, and the entire floor structure can be made into a whole after the later poured concrete is finished and cured to reach the design strength, thereby greatly improving the overall performance and seismic performance of the floor.

[0005] The technical solution of the patent is as follows:

[0006] The multilayer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab is composed of a concrete hollow slab (1), a longitudinal prestressed steel bar or non-prestressed steel bar (2) lengthened and extended out of the end of the concrete hollow slab at the lower layer, a longitudinal non-prestressed steel bar or prestressed steel bar (3) lengthened and extended out of the end of the concrete hollow slab at the upper layer, a transverse steel bar (4) lengthened and extended out of the width of the concrete hollow slab at the upper layer, a transverse steel bar (5) lengthened and extended out of the width of the concrete hollow slab at the lower layer, a concrete hole (8) in the concrete hollow slab, a concrete rib (9), stirrups (6) in the concrete rib (9), and a concrete shear bolt reserved groove (7) at the side edge of the concrete hollow slab. During the manufacture of the concrete hollow slab, after all the steel bars are firmly bound, side and end formworks and a formwork for the longitudinal hole in the concrete hollow slab are set up, and then the concrete is poured. After the pouring of the concrete is completed, the formworks are immediately removed. After the curing of the concrete and the reaching of the design strength, a firm and reliable multilayer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab is formed. Because the multilayer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab is longitudinally and transversely bidirectional, the steel bars at the upper and lower layers are lengthened and extended out of the concrete hollow slab. All the lengthened steel bars can be connected with other components adjacent thereto, and can be firmly structured together after the curing of the later-poured concrete reaches the design strength, thereby the whole floor structure can be integrated into a whole, and the integrity and the seismic resistance of the whole floor can be improved.

[0007] When the concrete hollow slab is hoisted, the floor composed of the multilayer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab should also have: a wall or beam (10) (see Figure 3 、 4 , 5, 6) bearing the hollow slab, a concrete ring beam or edge beam or wall (13), and a concrete structure beam (14) (see Figure 3 ) between the side edges of two concrete hollow slabs or a concrete cast-in-situ slab (14) (see Figure 4 、 5 ). After the installation of the hollow slab in place, the wall or beam (10) bearing the hollow slab also has secondary-poured cast-in-situ concrete (11) (see Figure 3 、 4 , 5, 6). The details are described as follows:

[0008] 1. The concrete hollow slab (1) is a main part of the multi-layer and multi-directionally lengthened prestressed steel bar + ordinary steel bar concrete hollow slab, which has a concrete hole (8), a concrete rib (9), and a concrete shear bolt reserved slot (7) on the side edge of the concrete hollow slab. The concrete of the concrete hollow slab also holds the following: the lower layer of lengthened longitudinal prestressed steel bar or non-prestressed steel bar (2) extending out of the end of the concrete hollow slab, the upper layer of lengthened longitudinal non-prestressed steel bar or prestressed steel bar (3) extending out of the end of the concrete hollow slab, the upper layer of transverse steel bar (4) extending out of the width of the concrete hollow slab at both ends, the lower layer of transverse steel bar (5) extending out of the width of the concrete hollow slab at both ends, and the stirrup (6) in the concrete rib (9). When all the steel bars are bound during the production of the concrete hollow slab, the formwork is erected, the concrete is poured, and the formwork is immediately removed after the pouring of the concrete is completed. After the curing of the concrete and the reaching of the design strength, the reliable and firm multi-layer and multi-directionally lengthened prestressed steel bar + ordinary steel bar concrete hollow slab is formed.

[0009] 2. The lower layer of lengthened longitudinal prestressed steel bar or non-prestressed steel bar (2) of the concrete hollow slab can be ordinary steel bar or steel strand, can be multiple cold-drawn steel wires, or can be a tensile bar made of carbon fiber or glass fiber material, and the steel bar extends out of the end of the concrete hollow slab by a certain length at both ends. After the concrete hollow slab is hoisted and positioned, the lengthened steel bar should be reliably anchored in the concrete of the later-poured wall or beam, and when there is another hollow slab opposite to the hollow slab on the opposite side, the lengthened steel bars (2) at the ends of the corresponding two hollow slabs should be reliably connected to each other at the position of the wall or beam and be reliably anchored in the concrete of the later-poured wall or beam.

[0010] 3. The upper layer of lengthened longitudinal non-prestressed steel bar or prestressed steel bar (3) of the concrete hollow slab can be ordinary steel bar or steel strand, can be multiple cold-drawn steel wires, or can be a tensile bar made of carbon fiber or glass fiber material, and the steel bar extends out of the end of the concrete hollow slab by a certain length at both ends. After the concrete hollow slab is hoisted and positioned, the lengthened steel bar should be reliably anchored in the concrete of the later-poured wall or beam, and when there is another hollow slab opposite to the hollow slab on the opposite side, the lengthened steel bars (3) at the ends of the corresponding two hollow slabs should be reliably connected to each other at the position of the wall or beam and be reliably anchored in the concrete of the later-poured wall or beam.

[0011] 4. The upper layer of transverse steel bar (4) and the lower layer of transverse steel bar (5) of the concrete hollow slab, which extend out of the width of the concrete hollow slab at both ends, can be ordinary steel bar or steel strand, can be multiple cold-drawn steel wires, or can be a tensile bar made of carbon fiber or glass fiber material.

[0012] The transverse steel bars (5) extending out of the width of the concrete hollow slab can be ordinary steel bars or cold-drawn steel wires, or tensile bars made of carbon fiber or glass fiber materials. The transverse steel bars (4), (5) are both lengthened to extend out of the width of the concrete hollow slab by a certain length. After the concrete hollow slab is hoisted into position, the upper and lower lengthened transverse steel bars (4), (5) can be reliably connected with other components adjacent to the floor and anchored together, and can be firmly anchored in the later poured concrete, which greatly helps the integrity of the entire floor. If it is calculated that the steel bars are not needed, the steel bars can not be used.

[0013] (5) can be reliably connected with other components adjacent to the floor and anchored together, and can be firmly anchored in the later poured concrete, which greatly helps the integrity of the entire floor. If it is calculated that the steel bars are not needed, the steel bars can not be used.

[0014] 5. The stirrups (6) in the concrete ribs (9) in the concrete hollow slab can be ordinary steel bars, cold-drawn steel wires, or tensile bars made of carbon fiber or glass fiber materials. The stirrups can be single-limb stirrups or double-limb stirrups. If there is a secondary poured concrete overlay designed on the surface of the concrete hollow slab, the stirrups can also be lengthened to extend above the surface of the concrete hollow slab for the secondary poured concrete overlay on the concrete hollow slab, so as to further improve the integrity of the floor and the load-bearing capacity of the floor. If it is calculated that the steel bars are not needed, the steel bars can not be used.

[0015] 6. Concrete shear studs can be formed at the concrete shear stud reserved slots (7) at the side edges of the concrete hollow slab. After the concrete hollow slab is hoisted into position, the side edges of the concrete hollow slab should have concrete construction beams (14) (see Figure 3 ) or cast-in-place concrete slabs (14)

[0016] (see Figure 4 、 5 ), as well as concrete ring beams or edge beams or walls (13) (see Figure 3 、 4 , 5, 6). After the concrete is poured at these positions and cured to the design strength, the concrete shear studs can be formed at the shear stud reserved slots.

[0017] 7. When the concrete hollow slab is hoisted, when the side edge of one concrete hollow slab is adjacent to another concrete hollow slab, a certain spacing should be left between the two concrete hollow slabs, i.e. the width of the concrete construction beam (14) (see Figure 3 ), so that the upper and lower lengthened transverse steel bars (4), (5) of the adjacent two concrete hollow slabs can be reliably connected and firmly anchored in the later poured concrete within the spacing, i.e. a cast-in-place reinforced concrete construction beam is formed, and the position of the construction beam can also be a shear wall. When the side edge of the concrete hollow slab is adjacent to a concrete ring beam or edge beam or wall (13) (see Figure 3 、 4When the length of the transverse steel bars (4), (5) is increased to 5, 6, the lengthened transverse steel bars (4), (5) of the concrete hollow slab should be reliably connected at the ring beam or the side beam or the wall and firmly anchored in the concrete to be cast later.

[0018] 8. Because the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab is a new technology, many people may not easily accept this technology in a short time. In order to make people accept this technology more quickly, when installing, we can increase the spacing between the side edges of two adjacent concrete hollow slabs, which can be increased to the width of the concrete hollow slab or even greater than the width of the concrete hollow slab, i.e. the cast-in-place steel reinforced concrete construction beam between the side edges of the two concrete hollow slabs is changed to a cast-in-place steel reinforced concrete slab 14 (see Figure 3 、 4 、5), which can be a solid cast-in-place steel reinforced concrete slab or a cast-in-place steel reinforced concrete hollow slab. In this way, the proportion of cast-in-place concrete slab in the floor can be increased, so that people think that this can further improve the integrity of the floor and accept this technology.

[0019] 9. The multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab that has been hoisted into place can be used as a floor slab in the normal use stage, and can also be used as a formwork support in the construction stage (see Figure 5 ). This can make it easier to control the elevation and size of the formwork during erection on the construction site, and the formwork is simpler and more convenient to make and install, with better quality, which can save a lot of labor and materials, and greatly shorten the construction period, thereby saving the engineering cost.

[0020] 10. Because the width of the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab is not limited. When the conditions permit, such as transportation conditions, road conditions and hoisting machinery, we can also increase the width of the concrete hollow slab to the length of a room, i.e. only one concrete hollow slab can be used for a room, which can reduce the workload of steel bars and formwork. Moreover, the surface of the concrete hollow slab can be polished during production, which can greatly reduce the subsequent workload. And the integrity of the floor is better, thereby greatly improving the seismic performance of the entire floor.

[0021] Advantages obtained

[0022] 1. The multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab technology creatively lengthens the lower layer of prestressed steel bars or non-prestressed steel bars (2), and creatively increases the upper layer of lengthened non-prestressed steel bars or prestressed steel bars

[0023] (3) and the upper and lower two layers of lengthened transverse reinforcement (4), (5), and the shear reinforcement (6) in the concrete rib (9) is increased, and the shear bolt reserved groove (7) of the concrete hollow slab side is increased, so that the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab can be reliably connected with other components of the same floor, and can be firmly structured together after the curing of the later poured concrete reaches the design strength, thereby forming a whole floor structure, thereby improving the overall and seismic performance of the whole floor. The prestressed reinforced concrete hollow slab technology that has been eliminated has been re-applied.

[0024] 2. The multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab technology can more effectively utilize the strength of steel and concrete due to the use of prestressed technology, can make the floor span larger, deflection smaller, and strength higher, thereby saving a large amount of labor and materials, and greatly shortening the construction period

[0025] 3. The multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab technology can change a large number of operations on the construction site, such as steel bar manufacturing, binding, formwork manufacturing, installation, and concrete pouring, to factory operations. As is known, standardized and mechanized manufacturing in factories can greatly save labor, materials, and time, and the quality is better.

[0026] 4. Due to the use of multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab as formwork support during the construction phase, the elevation and size of the formwork erection on the construction site can be more easily controlled, the formwork installation is more simple and convenient, and the quality is better, which can save a large amount of labor and materials, and greatly shorten the construction period.

[0027] 5. The multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab can be mechanically installed, so the installation is more simple and convenient, the quality is more guaranteed, a large amount of labor and materials can be saved, and the construction period can be greatly shortened. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic view of a multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab. The numbers in the figure are described in detail as follows:

[0029] (1) is a multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel reinforced concrete hollow slab.

[0030] (2) is the lower layer of the two ends of the longitudinal prestressed steel or non-prestressed steel of the multi-layer, multi-directional lengthened prestressed steel + ordinary reinforced concrete hollow slab. The steel can be ordinary steel or steel strand, or multiple cold-drawn steel wires, or a tensile reinforcement made of carbon fiber or glass fiber material.

[0031] (3) is the upper layer of the two ends of the longitudinal non-prestressed steel or prestressed steel of the multi-layer, multi-directional lengthened prestressed steel + ordinary reinforced concrete hollow slab. The steel can be ordinary steel or steel strand, or multiple cold-drawn steel wires, or a tensile reinforcement made of carbon fiber or glass fiber material. If it is calculated that the steel is not needed, it can also be omitted.

[0032] (4) is the transverse steel of the upper layer of the multi-layer, multi-directional lengthened prestressed steel + ordinary reinforced concrete hollow slab, which is lengthened and protrudes out of the width of the concrete hollow slab. The steel can be ordinary steel or cold-drawn steel wire, or a tensile reinforcement made of carbon fiber or glass fiber material. If it is calculated that the steel is not needed, it can also be omitted.

[0033] (5) is the transverse steel of the lower layer of the multi-layer, multi-directional lengthened prestressed steel + ordinary reinforced concrete hollow slab, which is lengthened and protrudes out of the width of the concrete hollow slab. The steel can be ordinary steel or cold-drawn steel wire, or a tensile reinforcement made of carbon fiber or glass fiber material. If it is calculated that the steel is not needed, it can also be omitted.

[0034] (6) is the stirrup (6) in the concrete rib (9) of the multi-layer, multi-directional lengthened prestressed steel + ordinary reinforced concrete hollow slab (see Figure 2 ). In order to fully show the multi-layer, multi-directional lengthened prestressed steel + ordinary reinforced concrete hollow slab, the cross-sectional view is not shown, so Figure 1 the stirrup (6) inside the concrete hollow slab is not shown. Figure 1

[0035] (7) is the concrete shear bolt reserved slot on the side of the multi-layer, multi-directional lengthened prestressed steel + ordinary reinforced concrete hollow slab. The concrete shear bolt can be formed at the concrete shear bolt reserved slot (7). When the concrete hollow slab is hoisted into place, the side of the concrete hollow slab should have a cast-in-place concrete structure beam (14) (see Figure 3 ) or a cast-in-place concrete slab (14) (see Figure 4 、 5 ), as well as a cast-in-place concrete ring beam or edge beam or wall (13) (see Figure 3 、 4 ​, 5, 6). When the concrete casting at these parts is completed and the curing reaches the design strength, the concrete shear bolt at the shear bolt reserved slot is formed.

[0036] (8) is the concrete hole in the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0037] (9) is the concrete rib in the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0038] Figure 2 is the steel bar display diagram in the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The numbers in the diagram are explained as follows:

[0039] (1) is the concrete hollow slab in the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0040] (2) is the lower layer of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab, which is the longitudinal prestressed steel bar or non-prestressed steel bar lengthened and protruding from the ends of the concrete hollow slab. The steel bar can be ordinary steel bar or steel strand, or multiple cold-drawn steel wires, or tensile steel bar made of carbon fiber or glass fiber material.

[0041] (3) is the upper layer of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab, which is the longitudinal non-prestressed steel bar or prestressed steel bar lengthened and protruding from the ends of the concrete hollow slab. The steel bar can be ordinary steel bar or steel strand, or multiple cold-drawn steel wires, or tensile steel bar made of carbon fiber or glass fiber material. If the calculation shows that the steel bar is not needed, it can also be omitted.

[0042] (4) is the upper layer of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab, which is the transverse steel bar lengthened and protruding from the width of the concrete hollow slab. The steel bar can be ordinary steel bar or cold-drawn steel wire, or tensile steel bar made of carbon fiber or glass fiber material. If the calculation shows that the steel bar is not needed, it can also be omitted.

[0043] (5) is the lower layer of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab, which is the transverse steel bar lengthened and protruding from the width of the concrete hollow slab. The steel bar can be ordinary steel bar or cold-drawn steel wire, or tensile steel bar made of carbon fiber or glass fiber material. If the calculation shows that the steel bar is not needed, it can also be omitted.

[0044] (6) is the stirrup (6) in the concrete rib (9) of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The stirrup is generally made of ordinary steel bar or cold-drawn steel wire, and can also be made of a tensile bar made of carbon fiber or glass fiber material; it can be a single stirrup or a double stirrup; if a concrete composite layer is designed on the surface of the concrete hollow slab, the stirrup can also be lengthened to be higher than the surface of the concrete hollow slab for the secondary pouring of the concrete composite layer on the surface of the concrete hollow slab. If the stirrup is not needed according to the calculation of a certain project, the stirrup can also be omitted.

[0045] (7) is the concrete shear bolt reserved slot of the side of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The concrete shear bolt can be formed at the concrete shear bolt reserved slot (7). When the concrete hollow slab is hoisted and positioned, the side of the concrete hollow slab should have a cast-in-place reinforced concrete construction beam (14) (see Figure 3 ) or a cast-in-place reinforced concrete slab (14) (see Figure 4 、 5 ), and a cast-in-place reinforced concrete ring beam or edge beam or wall (13) (see Figure 3 、 4 , 5, 6). When the concrete of these parts is poured and cured to reach the design strength, the concrete shear bolt can be formed at the shear bolt reserved slot.

[0046] (8) is the concrete hole in the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0047] (9) is the concrete rib in the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0048] Figure 3 is the installation schematic diagram of the floor formed by the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. In addition to the steel bars on the concrete hollow slab, the steel bars on other beams, ring beams or edge beams or walls, and construction beams are not shown. The numbers in the figure are explained as follows:

[0049] (1) is the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab in the floor formed by the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0050] (10) is the wall or beam that bears the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0051] (11) is the secondary pouring concrete on the wall or beam (10) of the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The pouring of the concrete is after the hoisting and positioning of the concrete hollow slab, and the reliable connection and anchoring of the steel bars at both ends of the concrete hollow slab on the wall or beam, or the reliable connection and anchoring of the steel bars at both ends of the concrete hollow slab on the wall or beam, and the secondary pouring on the wall or beam, which can reliably connect the concrete hollow slab with the wall or beam.

[0052] (12) is the position of the cast-in-place reinforced concrete ring beam or edge beam or wall adjacent to the side edge of the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab before pouring the concrete.

[0053] (13) is the cast-in-place reinforced concrete ring beam or edge beam or wall adjacent to the side edge of the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The concrete of the ring beam or edge beam or wall is poured after the hoisting and positioning of the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab, and the reliable connection and anchoring of the transverse steel bars at both ends of the concrete hollow slab on the side edge of the ring beam or edge beam or wall. This can reliably connect the concrete hollow slab with the concrete ring beam or edge beam or wall.

[0054] (14) is the cast-in-place reinforced concrete construction beam between two adjacent concrete hollow slabs (this position can also be the position of a concrete shear wall). The concrete of the construction beam (or shear wall) is poured after the hoisting and positioning of the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab, and the reliable connection and anchoring of the transverse steel bars at both ends of the concrete hollow slab on the side edge of the construction beam. This can reliably connect the concrete hollow slabs.

[0055] Figure 4 is another installation schematic diagram of the floor formed by the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. This diagram is the installation schematic diagram of the cast-in-place reinforced concrete slab (14) by widening the cast-in-place reinforced concrete construction beam (14) in Figure 3 . The steel bars on the concrete hollow slab, as well as the steel bars on the other cast-in-place beams, ring beams or edge beams or walls, and cast-in-place reinforced concrete slabs, are not shown. The numbers in the diagram are explained in detail as follows:

[0056] (1) is the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab in the floor formed by the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0057] (10) is the wall or beam of the multi-layer, multi-directional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0058] (11) is the secondary pouring concrete on the wall or beam (10) of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The pouring of the concrete is after the hoisting of the concrete hollow slab into place, and the reliable connection and anchoring of the steel bars at both ends of the concrete hollow slab which are lengthened and extended out of the end of the concrete hollow slab on the wall or beam, or the reliable connection and anchoring of the steel bars at both ends of the two opposite concrete hollow slabs which are lengthened and extended out of the end of the concrete hollow slab on the wall or beam, and then the secondary pouring on the wall or beam. This can make the concrete hollow slab reliably connected with the wall or beam.

[0059] (12) is the position of the cast-in-place reinforced concrete ring beam or edge beam or wall adjacent to the side edge of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab before pouring the concrete.

[0060] (13) is the cast-in-place concrete ring beam or edge beam or wall adjacent to the side edge of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The concrete of the ring beam or edge beam or wall is poured after the hoisting of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab into place, and the reliable connection and anchoring of the transverse steel bars at both ends of the side edge which are lengthened and extended out of the width of the concrete hollow slab at the position of the ring beam or edge beam or wall. This can make the concrete hollow slab reliably connected with the concrete ring beam or edge beam or wall.

[0061] (14) is the cast-in-place reinforced concrete slab between two adjacent concrete hollow slabs. The cast-in-place reinforced concrete slab is the cast-in-place reinforced concrete slab which is widened after the cast-in-place reinforced concrete construction beam in the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab is hoisted into place, and the cast-in-place reinforced concrete slab can be a solid reinforced concrete slab or a reinforced concrete hollow slab. The concrete of the cast-in-place reinforced concrete slab is poured after the hoisting of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab into place, and the reliable connection and anchoring of the transverse steel bars at both ends of the side edge which are lengthened and extended out of the width of the concrete hollow slab at the position of the cast-in-place reinforced concrete slab. This can make the concrete hollow slab reliably connected. Figure 3

[0062] Figure 5 is the installation diagram of the formwork during the construction of the floor of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The diagram shows that the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab (1) can be used as the floor for normal use, and can also be used as the formwork support during construction. Except for the steel bars on the concrete hollow slab, the steel bars on other beams, ring beams or edge beams or walls and reinforced concrete slabs are not shown. The numbers in the diagram are explained in detail as follows:

[0063] ​(1) is a floor slab composed of multi-layer, multi-directionally elongated prestressed steel bars and ordinary reinforced concrete hollow slabs.

[0064] (10) is a wall or beam that bears multiple layers and multi-directional elongation of prestressed steel bars + ordinary reinforced concrete hollow slabs.

[0065] (11) is the secondary pouring of concrete on the wall or beam (10) of a multi-layered, multi-directionally extended prestressed steel reinforced concrete hollow slab. This concrete is poured after the hollow concrete slab is hoisted into place, and after the extended steel bars extending from both ends of the hollow concrete slab are reliably connected and anchored on the wall or beam, or after the extended steel bars extending from both ends of two opposite hollow concrete slabs are reliably connected and anchored on the wall or beam, then a secondary pour is made on the wall or beam. This ensures a reliable connection between the hollow concrete slab and the wall or beam.

[0066] (12) is the position of the cast-in-place reinforced concrete ring beam or side beam or wall adjacent to the side of the multi-layered, multi-directionally extended prestressed steel + ordinary reinforced concrete hollow slab before the concrete is poured.

[0067] (13) is a cast-in-place concrete ring beam, edge beam, or wall adjacent to the side of a multi-layered, multi-directionally extended prestressed steel reinforced concrete hollow slab. The concrete of this ring beam, edge beam, or wall is poured after the multi-layered, multi-directionally extended prestressed steel reinforced concrete hollow slab has been hoisted into place, and transverse reinforcing bars extending beyond the width of the hollow slab at both ends of its side are reliably connected and anchored at the position of the ring beam, edge beam, or wall. This ensures a reliable connection between the hollow slab and the concrete ring beam, edge beam, or wall.

[0068] (14) is a cast-in-place reinforced concrete slab between two adjacent hollow concrete slabs. This cast-in-place reinforced concrete slab is installed during the hoisting of multi-layered, multi-directionally elongated prestressed steel + ordinary reinforced concrete hollow slabs. Figure 3 The cast-in-place reinforced concrete structural beams are widened and replaced with cast-in-place reinforced concrete slabs. These slabs can be solid or hollow. The concrete for these slabs is poured after the multi-layered, multi-directionally elongated prestressed steel reinforcement and ordinary reinforced concrete hollow slabs are hoisted into place. Lateral reinforcement bars, extending beyond the width of the hollow slab at both ends of the slab, are reliably connected and anchored at the slab. This ensures a reliable connection between the hollow slabs.

[0069] (15) Hanging beams for formwork used in cast-in-place reinforced concrete slabs.

[0070] (16) Hanging of formwork for cast-in-place reinforced concrete slabs.

[0071] (17) A cushion block for supporting a hanging beam.

[0072] (18) A bottom formwork for cast-in-situ reinforced concrete slab.

[0073] Figure 6 is a schematic diagram of the installation of a floor composed of large multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The diagram shows the installation of a large concrete hollow slab (i.e. the case of using a large concrete hollow slab for a room). Except for the steel bars on the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab, the steel bars on other beams, ring beams or edge beams or walls are not shown. The numbers in the diagram are explained in detail as follows:

[0074] (1) is a multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab in a floor composed of multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slabs.

[0075] (10) is a wall or beam bearing a multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab.

[0076] (11) is secondary cast concrete on the wall or beam (10) bearing a multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The concrete is cast after the concrete hollow slab is hoisted into place, and the steel bars at both ends of the concrete hollow slab are lengthened to reliably connect and anchor on the wall or beam, or the steel bars at both ends of the two opposite concrete hollow slabs are lengthened to reliably connect and anchor on the wall or beam, and then the concrete is cast on the wall or beam. This can reliably connect the concrete hollow slab with the wall or beam.

[0077] (12) is the position of a cast-in-situ reinforced concrete ring beam or edge beam or wall adjacent to the side edge of a multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab before casting concrete.

[0078] (13) is a cast-in-situ concrete ring beam or edge beam or wall adjacent to the side edge of a multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab. The concrete of the ring beam or edge beam or wall is cast after the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab is hoisted into place, and the transverse steel bars at both ends of the side edge are lengthened to reliably connect and anchor at the position of the ring beam or edge beam or wall. This can reliably connect the concrete hollow slab with the concrete ring beam or edge beam or wall. DETAILED DESCRIPTION

[0079] I. Production of multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab:

[0080] 1) The lower layer of prestressed steel reinforced concrete hollow plate (2) is lengthened at both ends.

[0081] 2) The upper layer of prestressed steel reinforced concrete hollow plate is lengthened in the same direction as the lower layer (3). If the calculation of a certain project shows that the steel is not needed, the steel can not be used.

[0082] 3) The upper and lower layers of transverse steel (4), (5) are lengthened out of the width of the hollow plate. If the calculation of a certain project shows that the steel is not needed, the steel can not be used.

[0083] 4) The stirrup (6) in the concrete rib of the traditional prestressed steel reinforced concrete hollow plate is added. If the calculation of a certain project shows that the stirrup is not needed, the stirrup can not be used.

[0084] 5) On the basis of the traditional prestressed steel reinforced concrete hollow plate, the concrete shear bolt reserved slot (7) on the side of the steel reinforced concrete hollow plate is added. After the secondary pouring of concrete on the side of the hollow plate (such as concrete walls or beams on the side of the hollow plate, or concrete structural beams between two hollow plates) is completed, the concrete shear bolt can be formed in the reserved slot to further improve the integrity of the floor.

[0085] 6) After all the steel is firmly bound, the formwork is erected, the concrete is poured, and the concrete is cured for a period of time. After reaching the design strength, the multi-layer and multi-directionally lengthened prestressed steel + ordinary steel reinforced concrete hollow plate is completed.

[0086] II. Installation of multi-layer and multi-directionally lengthened prestressed steel + ordinary steel reinforced concrete hollow plate

[0087] 1. During installation, the longitudinal ends of the hollow plate (1) are generally placed on the wall or beam. The upper and lower layers of longitudinal steel (2), (3) at both ends of the hollow plate should be reliably anchored in the concrete of the later poured wall or beam. When there is another hollow plate opposite to the hollow plate, the lengthened steel (2), (3) at the ends of the two corresponding hollow plates should be reliably connected and anchored in the concrete of the later poured wall or beam.

[0088] 2. When the side of the multi-layer and multi-directionally lengthened prestressed steel + ordinary steel reinforced concrete hollow plate is adjacent to the wall or beam, the lengthened part of the upper and lower layers of transverse steel (4), (5) of the hollow plate should be inserted into the wall or beam and reliably anchored in the concrete of the later poured wall or beam. If necessary, the hollow plate and the wall or beam on its side can also be spaced a certain distance, and the space can also be poured with cast-in-place reinforced concrete.

[0089] 3. When the side of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab is adjacent to another hollow slab, a certain space should be left between the two hollow slabs during installation, i.e. the width of the concrete construction beam (14) (see Figure 3 ) is left, so that the lengthened transverse steel bars (4), (5) of the two adjacent hollow slabs can be reliably connected in the space and can be reliably anchored in the concrete to be cast later, i.e. a cast-in-place reinforced concrete construction beam is formed. In order to increase the integrity of the floor, the space between the side edges of the two hollow slabs can also be increased to the width of the hollow slab or even greater than the width of the hollow slab, i.e. the cast-in-place reinforced concrete construction beam between the side edges of the two hollow slabs is changed to a cast-in-place reinforced concrete slab (14) (see Figure 4 , Figure 5 ) which can be a solid cast-in-place reinforced concrete slab or a cast-in-place reinforced concrete hollow slab. In this way, the proportion of the cast-in-place concrete slab in the floor can be increased, and the integrity of the floor can be further improved. When the hollow slab is a large hollow slab, i.e. only one hollow slab is used for a house, the installation method is shown in Figure 6 .

[0090] 4. The multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab that has been hoisted into position can be used as a floor slab in the normal use stage, and can also be used as a formwork support for the cast-in-place reinforced concrete slab in the construction stage (see Figure 5 ). This can greatly save the labor and materials for erecting formwork, thereby saving the engineering cost and shortening the construction period.

[0091] When all the longitudinal and transverse lengthened steel bars of the multi-layer, multi-directionally lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab are reliably connected with their corresponding steel bars and firmly anchored in the positions of the wall, beam or construction beam, the formwork can be installed and the concrete of the wall, beam and the reinforced concrete construction beam (or reinforced concrete slab) in the space between the side edges of the hollow slab can be cast. After the cast concrete is cured to the design strength, the entire floor forms a reliable whole (as shown in Figure 3 , Figure 4 , Figure 5 , Figure 6 ).​​​​​​​​​​

Claims

1. Multilayer, multidirectional elongated prestressed steel bar + ordinary steel bar reinforced concrete hollow slab, characterized in that: The concrete hollow slab (1), the longitudinal prestressed steel or non-prestressed steel (2) which is lengthened and protrudes from the end of the concrete hollow slab at both ends of the lower layer, the longitudinal non-prestressed steel or prestressed steel (3) which is lengthened and protrudes from the end of the concrete hollow slab at both ends of the upper layer, the transverse steel (4) which is lengthened and protrudes from the width of the concrete hollow slab at both ends of the upper layer, the transverse steel (5) which is lengthened and protrudes from the width of the concrete hollow slab at both ends of the lower layer, the concrete hole (8) in the concrete hollow slab, the concrete rib (9), the stirrup (6) in the concrete rib (9), and the concrete shear bolt reserved slot (7) on the side of the concrete hollow slab are composed; all the steels above are bound firmly and poured together with the concrete at the same time to form an integral body which can bear force at the same time; after the installation of the hollow slab, the longitudinal and transverse double-direction of the multi-layer and multi-direction lengthened prestressed steel + ordinary steel reinforced concrete hollow slab, the upper and lower layers have the lengthened steels which protrude out of the hollow slab, the lengthened steels can be connected with other components of the same floor together, and can be firmly structured after the completion of the later poured concrete, and then the whole floor structure can be an integral body, and then the integrity and the seismic resistance of the whole building can be improved.

2. The multi-layer, multidirectional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab according to claim 1, characterized in that: The longitudinal prestressed steel or non-prestressed steel (2) which is lengthened and protrudes from the end of the concrete hollow slab at both ends of the lower layer can be ordinary steel or steel strand, can be multiple cold-drawn steel wires, or can be tensile reinforcement made of carbon fiber or glass fiber material.

3. The multi-layer, multidirectional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab according to claim 1, characterized in that: The longitudinal non-prestressed steel or prestressed steel (3) which is lengthened and protrudes from the end of the concrete hollow slab at both ends of the upper layer can be ordinary steel or steel strand, can be multiple cold-drawn steel wires, or can be tensile reinforcement made of carbon fiber or glass fiber material; if a project is calculated to not need the steel, the steel can also not be used.

4. The multi-layer, multidirectional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab according to claim 1, characterized in that: The transverse steel (4) which is lengthened and protrudes from the width of the concrete hollow slab at both ends of the upper layer and the transverse steel (5) which is lengthened and protrudes from the width of the concrete hollow slab at both ends of the lower layer can be ordinary steel or cold-drawn steel wire, or can be tensile reinforcement made of carbon fiber or glass fiber material; if a project is calculated to not need the steel, the steel can also not be used.

5. The multi-layer, multidirectional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab as claimed in claim 1, characterized in that: The stirrup (6) in the concrete rib (9) of the concrete hollow slab is generally made of ordinary steel or cold-drawn steel wire, or can be tensile reinforcement made of carbon fiber or glass fiber material; can be single stirrup or double stirrup; if there is a concrete composite layer designed on the surface of the hollow slab, the stirrup can also be lengthened to protrude above the surface of the hollow slab for the secondary pouring of the concrete composite layer on the surface of the hollow slab; if a project is calculated to not need the stirrup, the stirrup can also not be used.

6. The multi-layer, multidirectional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab as claimed in claim 1, characterized in that: The concrete shear bolt reserved slot (7) is arranged on the side of the concrete hollow slab.

7. The multi-layer, multidirectional lengthened prestressed steel bar + ordinary steel bar reinforced concrete hollow slab as claimed in claim 1, characterized in that: When the concrete hollow slab is installed, when the side edges thereof are adjacent to another concrete hollow slab, a certain spacing (14) should be left between the two concrete hollow slabs during installation.

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