A prefabricated prestressed hollow slab floor construction support system and construction method

Abstract

The present invention proposes a construction support system and method for prefabricated prestressed hollow slab floor, the support system includes a plurality of support units, the plurality of support units are connected into a support system, the two portal scaffolds of each support unit are arranged opposite to each other, the two sides of each portal scaffold are fixed with steel support tops by rotating buckles, support beams are installed in the top U-shaped grooves of the steel support tops on both sides, the prestressed hollow slab is placed on the two support beams, and the two sides are supported by ring beam formwork angle steels. The technical problem of how to provide support for prefabricated slabs in the construction of prefabricated prestressed continuous hollow slab floor is solved, and the advantages of assembly construction are reflected, and the support system is simplified. The present invention provides support for operations such as connecting part reinforcement and post-casting concrete, and can resist the horizontal load and vertical load generated by the prefabricated prestressed hollow slab during construction. It is not dependent on other components and is an independent system.

Description

Technical Field

[0001] The invention relates to an assembled prestressed hollow slab floor construction support system, belonging to the technical field of prefabricated slab construction support systems. Background Art

[0002] Prefabricated prestressed continuous hollow slab floor technology is a new type of floor assembly technology. At present, the mainstream of floor assembly construction technology is composite slabs, but there are problems of high cost and low efficiency. In order to reduce the amount of cast-in-place concrete of reinforced concrete composite slabs, reduce the production cost of composite slabs, simplify the construction process and construction measures, and tap the existing prefabricated slab production capacity, based on the current large-scale and widespread prestressed concrete hollow slabs, through reasonable building construction measures, a new type of composite slab with simple production, low cost, small amount of cast-in-place concrete, convenient construction and reliable performance is produced to meet the needs of building industrialization.

[0003] Based on the finished SP board, two processings are performed along the board span direction. When in use, the variable-section one-way precast hollow slab is used as the base plate, and negative bending reinforcement and cast-in-place concrete superimposed layers are arranged in the support areas at both ends. The negative bending reinforcement is connected to the reserved steel bars of the precast hollow slab on the one hand, and reliable anchoring is achieved at the support position on the other hand. The continuous force of the variable-section one-way precast hollow slab superimposed floor can be achieved through the reinforcement of the cast-in-place superimposed layer, which completely solves the problems of uncoordinated force of the precast slab during construction and use, weak connection between the wall and the precast slab, and difficulty in ensuring the quality of the wall connected by horizontal components, such as Figure 1 The variable-section one-way prefabricated hollow slab composite floor of the aggregate building has the advantages of no support during construction, saving materials, reducing the deadweight of prefabricated components, and increasing the sound insulation function of the board. It meets the requirements of green, energy-saving and environmental protection and is suitable for composite floor and composite roof of house construction.

[0004] The current support system for slab construction, taking the support cases of cast-in-place slabs of bridges and buildings as examples, has the common feature that a large number of brackets and cross bars are needed to support the formwork. Since bridge construction has no lateral constraints, more diagonal braces are needed to form an independent force system. The cast-in-place slabs of buildings are often supported in combination with the formwork of beams and columns, and the requirements for resisting lateral forces themselves are not high, so they mainly bear vertical loads and the system is simpler.

[0005] However, the situation has changed when prefabricated panels are constructed using assembly technology. Since there is no need to cast the floor slab again, all the formwork is eliminated, and only linear support is required for the prefabricated panels (in many cases, the prefabricated parts of the composite panels), which leads to a simplified floor support system. This system consists of vertical supports and crossbars. When there are available horizontal constraints, its own stability can be guaranteed, and it can be set up relatively simply. However, when there are no available horizontal constraints, it needs to be an independent system and needs to resist the horizontal loads (as well as vertical loads) during the hoisting construction of the prefabricated panels, which places higher requirements on its own force system.

[0006] Sometimes, after the prefabricated wall panels are securely fixed, the prefabricated panels can be placed on them, or a device fixed on them can be set to support the floor slab, which is equivalent to acting as a lateral constraint during the construction of the floor slab. It is only necessary to set a vertical support that reduces the span of the slab in the span of the slab, which reduces the requirements and difficulty for the vertical support under the slab. In more cases, the floor slab can be placed on the wall (or beam). The prerequisite is that the wall (or beam) has been effectively fixed and its surface is relatively flat. After a simple support, the floor slab can be supported, which is similar to the ring beam or brick wall of a traditional brick house.

[0007] In order to reduce the impact of the floor on the support, it is also an important measure to use a large-tonnage lifting device to hoist the floor. For example, a simple vertical support for the floor is set up with a tripod at the bottom, which can prevent the support from tipping over to a certain extent, but its more important function is to allow the support rod to be erected separately to facilitate the installation of the entire support system, rather than providing lateral resistance. This independent support system is not only effective for floor construction, but can also be used in the construction of prefabricated beams. The disadvantage of using vertical supports in beams and floor slabs is that the lateral stiffness is very low, and it is difficult to form a structure that can independently withstand horizontal loads.

[0008] There are many forms of support methods for this purpose. The most common one is single-point support. There is also a combined support method when supporting beams. The common feature of the two is that the influence of horizontal loads is almost ignored, which is obviously based on the situation of lateral constraints.

[0009] In order to resist the action of horizontal load, a support method similar to full-floor scaffolding is generally adopted, relying on numerous rod systems to ensure lateral stiffness. However, judging from the difference between cast-in-place slabs and prefabricated slabs, this scheme is obviously too conservative. This method of improving lateral stiffness is not entirely reasonable, and the support has not been changed from cast-in-place to prefabricated to reduce the engineering workload. Summary of the invention

[0010] In order to solve the technical problem of how to provide support for prefabricated panels in the construction of prefabricated prestressed continuous hollow slab floors, reflect the advantages of assembled construction, and simplify the support system, the present invention proposes a support system for prefabricated prestressed continuous hollow slab floors in the construction link, which provides support for operations such as connecting part reinforcement and post-casting concrete.

[0011] The present invention proposes an assembled prestressed hollow slab floor construction support system, comprising a plurality of support units, which are connected into a support system, each support unit comprising two portal scaffolds, four steel support tops, a rotating buckle, two support beams and a ring beam formwork angle steel, the two portal scaffolds are arranged opposite to each other, and steel support tops are fixed on both sides of each portal scaffold through a rotating buckle, support beams are installed in U-shaped grooves on the tops of the steel support tops on both sides, the prestressed hollow slab is placed on the two support beams, and the two sides are supported by the ring beam formwork angle steel.

[0012] Preferably, the portal scaffolding comprises a plurality of scaffolding frames, pedals and a plurality of pull rods, the pedals are fixed on the plurality of scaffolding frames, and a pull rod is installed between two adjacent scaffolding frames.

[0013] Preferably, the steel support top includes an inner tube, an outer tube, an adjustment device and a top plate. The inner tube is installed above the outer tube, and the bottom is sleeved inside the outer tube. The lengths of the inner tube and the outer tube are adjusted by the adjustment device, and a top plate is installed on the inner tube.

[0014] Preferably, the adjusting device comprises an adjusting nut, a pin and a handle, the adjusting nut is sleeved outside the outer tube, the pin is inserted into the hole of the inner tube for positioning, and the handle presses the pin for fixing.

[0015] Preferably, the prefabricated prestressed hollow slab floor construction support system further comprises a plurality of supporting scaffolding rods, wherein the supporting scaffolding rods are vertically located above the two portal scaffolds and connected to two opposite steel support tops by rotating buckles.

[0016] Preferably, the ring beam formwork angle steel is supported by a ring beam side formwork support, and the ring beam side formwork support is fixed on the top of the steel support and is arranged at a certain angle to the top of the steel support.

[0017] A construction method of the assembled prestressed hollow slab floor construction support system specifically comprises the following steps:

[0018] (1) Select appropriate portal scaffolding according to different floor heights and room lengths, and assemble two groups of portal scaffolding at 100-200mm from the wall side. Select appropriate supporting scaffolding rods according to the scaffolding span. Connect a steel support top to each portal scaffolding frame 200-300mm above the column close to the wall side. Adjust the height according to the floor height. At the same time, connect the opposite steel support tops on both sides with supporting scaffolding rods to increase horizontal rigidity. The distance between the supporting scaffolding rods and the bottom of the board is 250-400mm;

[0019] (2) Then install the support beams in the U-shaped grooves of the steel support tops on both sides so that the two rows of support units are connected into a support system;

[0020] (3) Construct formwork for the ring beam concrete. After the floor slab is installed, construct formwork for the ring beam on the floor slab and the wall. Use the angle steel of the ring beam formwork as the side formwork. Use the rotating clip to adjust the steel pipe and the ring beam side formwork support to the right angle to support the side formwork.

[0021] The beneficial effects of the prefabricated prestressed hollow slab floor construction support system and construction method of the present invention are:

[0022] 1. This support system can resist the horizontal and vertical loads generated by the prefabricated prestressed hollow slab during construction. It is not attached to other components and is an independent system.

[0023] 2. This support system should be able to provide a horizontal reference surface for the bottom elevation of the slab, and it should have its own adjustment function to provide the reference surface.

[0024] 3. This support system provides linear supports at both ends of each slab, and the floor slab can be stably placed on the support system.

[0025] 4. This support system can be used as a construction operation platform for workers to thread reinforcement, plaster and fill joints.

[0026] 5. This support system provides support for the ring beam formwork at the end of the slab.

[0027] 6. After pouring the concrete of this support system, the devices except the vertical poles can be dismantled first to speed up the turnover.

[0028] 7. This support system is simple, easy to assemble and disassemble, and has light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] In the attached picture:

[0031] Figure 1It is the structural diagram of the continuous hollow slab mentioned in the background technology of the present invention;

[0032] Figure 2 It is a schematic diagram of the overall structure of a prefabricated prestressed hollow slab floor construction support system according to the present invention;

[0033] Figure 3 This is an assembly diagram of the portal scaffolding of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the adjustable steel support top according to the present invention;

[0035] Figure 5 It is a structural schematic diagram of the connection between the portal scaffolding and the steel support top of the present invention;

[0036] Figure 6 It is a front view of the support system framework of the present invention;

[0037] Figure 7 It is a schematic diagram of the support system framework structure of the present invention;

[0038] Figure 8 It is a structural schematic diagram of the ring beam formwork angle steel of the present invention;

[0039] Among them, 1-scaffolding frame, 2-pedal, 3-pull rod, 4-outer tube, 5-adjusting nut, 6-pin, 7-handle, 8-top plate, 9-steel support top, 10-rotating buckle, 11-gantry scaffolding, 12-ring beam side form support, 13-supporting beam, 14-supporting scaffolding rod, 15-ring beam formwork angle steel, 16-plastering and grouting pedal, 17-prestressed hollow slab. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings:

[0041] Specific implementation method 1: See Figure 1-8 The present embodiment is described. The prefabricated prestressed hollow slab floor construction support system described in the present embodiment includes a plurality of support units, and the plurality of support units are connected into a support system, each support unit includes two portal scaffolds 11, four steel support tops 9, a rotating buckle 10, two support beams 13 and a ring beam formwork angle steel 15, the two portal scaffolds 11 are arranged opposite to each other, and steel support tops 9 are fixed on both sides of each portal scaffold 11 by rotating buckles 10, and support beams 13 are installed in the top U-shaped grooves of the steel support tops 9 on both sides, and the prestressed hollow slab is placed on the two support beams 13, and the two sides are supported by the ring beam formwork angle steel 15.

[0042] The portal scaffold 11 comprises a plurality of scaffold frames 1, pedals 2 and a plurality of tie rods 3. The pedals 2 are fixed on the plurality of scaffold frames 1, and a tie rod 3 is installed between two adjacent scaffold frames 1.

[0043] The steel support top 9 includes an inner tube, an outer tube 4, an adjusting device and a top plate 8. The inner tube is installed above the outer tube 4, and the bottom is sleeved in the outer tube 4. The inner tube and the outer tube 4 are adjusted in length by the adjusting device, and the top plate 8 is installed on the inner tube.

[0044] The inner tube is provided with a hole, and the adjusting device comprises an adjusting nut 5, a pin 6 and a handle 7. The adjusting nut 5 is sleeved on the outer tube 4, the pin 6 is inserted into the hole of the inner tube for positioning, and the handle 7 presses the pin 6 for fixing.

[0045] When the floor height is less than 3.6m, the length of the outer tube 4 is selected to be 2400mm, and the maximum height of the inner tube is adjusted to 3900mm; when the floor height is 4.2m-4.8m, the length of the outer tube 4 is selected to be 3800mm, and the maximum height of the inner tube is adjusted to 5000mm.

[0046] The assembled prestressed hollow slab floor construction support system also includes a plurality of supporting scaffolding rods 14 , which are vertically located above two portal scaffolds 11 and connected to two opposite steel support tops 9 via a rotating buckle 10 .

[0047] The portal scaffold 11 is a relatively formed system structure, and the existing product size specifications are more, and the narrowest 950mm wide portal scaffold 11 can meet the needs. According to the different floor heights, it can be used in a single layer, and the portal scaffold 11 combinations of different heights can also be selected.

[0048] The steel support top 9 is an adjustable steel support top. The adjustment principle is that the inner tube adjusts the height by telescoping inside the outer tube 4. A hole is punched on the inner tube every 150mm-200mm, and the pin and the adjusting nut 5 are used for positioning. The hole is used for long-distance adjustment, and the adjusting nut 5 is used for short-distance adjustment to ensure continuity within the entire adjustment range. According to the floor height requirements, when the floor height is less than 3.6m, the length of the outer tube 4 is selected to be 2400mm, and the maximum height of the inner tube is 3900mm; when the floor height is 4.2m-4.8m, the length of the outer tube 4 is selected to be 3800mm, and the maximum height of the inner tube is 5000mm.

[0049] The connection between the gantry scaffold 11 and the steel support top 9 adopts the connection method of steel pipe scaffold fasteners, which ensures that the steel pipe and the fastener are in a surface fit state, and the fit area is maximized, overcomes the point or line fit between the old fastener and the steel pipe, eliminates the hidden danger of the steel pipe slipping, thereby ensuring and improving the overall mechanical properties and safety performance of the scaffold. The fasteners are light and beautiful, the loading and unloading speed is increased, and the labor intensity is reduced.

[0050] Since the manufacturing process of the portal scaffolding 11 cannot guarantee the parallelism of the upper and lower beams and the verticality of the beams and the vertical beams, a rotating buckle 10 is selected to ensure that the steel support top is in a vertical direction and fits with the ground during installation, thereby reducing the inclination of the steel support top 9 and preventing the steel support top 9 from overturning when the portal scaffolding 11 is removed.

[0051] The ring beam formwork angle steel 15 is supported by the ring beam side formwork support 12 , and the ring beam side formwork support 12 is fixed on the steel support top 9 and is arranged at a certain angle to the steel support top 9 .

[0052] The construction method of the assembled prestressed hollow slab floor construction support system is as follows:

[0053] According to different storey heights and room lengths, select appropriate gantry scaffolds 11 to overlap and combine, assemble two groups of gantry scaffolds 11 at 100-200mm from the wall side, and select appropriate supporting scaffolding rods 14 for the scaffolding span according to the room length. According to the needs, supporting scaffolding rods 14 can be added between the two groups of gantry scaffolds 11 to strengthen the horizontal rigidity of the system. One steel support top 9 is connected to each gantry scaffold 11 shelf at 200-300mm above the column near the wall side (it must be connected to the upper and lower cross beams of the gantry scaffold 11), and the height is adjusted according to the storey height. At the same time, the steel support tops 9 on both sides are connected with supporting scaffolding rods 14 to increase the horizontal rigidity. According to the needs, the supporting scaffolding rods 14 are 250-400mm away from the bottom of the board. Finally, the supporting beams 13 are installed in the U-shaped grooves of the steel support tops 9 on both sides, so that the two rows of supporting units are connected as a whole.

[0054] After the floor slab is installed, the formwork for the ring beam is constructed on the floor slab and the wall. The unequal-sided ring beam formwork angle steel 15 is used as the side formwork, and the steel pipe and the ring beam side formwork support 12 are adjusted to the right angle to support the side formwork with the rotating buckle 10. When the rigidity of the support system is weak, it is appropriate to increase the diagonal brace to improve the lateral rigidity.

[0055] The innovative features of the prefabricated prestressed hollow slab floor construction support system described in this embodiment are:

[0056] 1. This support system is a system, which includes physical components such as portal scaffolding components, adjustable steel support tops 9, connecting fasteners and connecting rods, all of which are ready-made industrial products that can be used, and the support height can be adjusted vertically to meet the floor construction requirements of buildings with different storey heights.

[0057] 2. This support system is developed based on the assembled continuous load-bearing hollow slab, which is only partially overlapped and cast. Therefore, the whole cross-section of the slab is involved in the work during construction, and only support is required at both ends. Therefore, a support scheme of setting a row of portal scaffoldings 11 at both ends of the slab is proposed.

[0058] 3. This support system adopts the support scheme of portal scaffolding 11 + steel support top 9, which is also suitable for the construction of general composite floor slabs or other prefabricated floor slabs.

[0059] 4. This support system has the characteristic of quick disassembly. The steel support top 9 and the portal scaffolding 11 can be disassembled. After the floor slab is installed and the post-casting strip is poured, the portal scaffolding 11 and a series of struts except the steel support top 9 (and the beam of the supporting plate) can be completely dismantled and recycled. The steel support top 9 will bear the load and will be dismantled after the strength of the post-cast concrete reaches the design requirements.

[0060] 5. Compared with the traditional single-point support system, this support system greatly reduces the free length of the top through the portal scaffolding 11, thereby providing high-rigidity lateral support. At the same time, the two opposite steel support tops 9 are connected with connecting rods to increase the rigidity of the entire support system and prevent shaking during construction.

[0061] 6. This support system has many functions, such as providing support for ring beam formwork and providing an operating platform for plastering and caulking.

[0062] 7. The pedal height of this support system is divided into multiple gears to meet the height requirements of different uses.

[0063] 8. The support system includes a post-cast ring beam formwork system, in which the formwork and support are arranged in the form of struts + angle steels, wherein other L-shaped components are in fact equivalent to angle steels and are also within the scope of the rights of the present invention.

[0064] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. It can also be a reasonable combination of the features recorded in the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated prestressed hollow slab floor construction support system, characterized in that: The invention comprises a plurality of supporting units, wherein the plurality of supporting units are connected to form a supporting system, wherein each supporting unit comprises two gantry scaffolds (11), four steel supporting tops (9), a rotating buckle (10), two supporting beams (13) and a ring beam formwork angle steel (15), wherein the two gantry scaffolds (11) are arranged opposite to each other, and steel supporting tops (9) are fixed on both sides of each gantry scaffold (11) through the rotating buckle (10), and supporting beams (13) are installed in the top U-shaped grooves of the steel supporting tops (9) on both sides, and the prestressed hollow slab is placed on the two supporting beams (13), and the two sides are supported by the ring beam formwork angle steel (15); The assembled prestressed hollow slab construction support system further comprises a plurality of supporting scaffolding rods (14), wherein the supporting scaffolding rods (14) are vertically located above the two portal scaffolds (11) and connected to two opposite steel support tops (9) via a rotating buckle (10); The ring beam formwork angle steel (15) is supported by the ring beam side formwork support (12), and the ring beam side formwork support (12) is fixed on the steel support top (9) and is arranged at a certain angle to the steel support top (9).

2. The prefabricated prestressed hollow slab floor construction support system according to claim 1 is characterized in that: The door-type scaffold (11) comprises a plurality of scaffold frames (1), pedals (2) and a plurality of pull rods (3); the pedals (2) are fixed on the plurality of scaffold frames (1), and a pull rod (3) is installed between two adjacent scaffold frames (1).

3. The prefabricated prestressed hollow slab floor construction support system according to claim 1 is characterized in that: The steel support top (9) comprises an inner tube, an outer tube (4), an adjusting device and a top plate (8); the inner tube is installed above the outer tube (4), and the bottom is sleeved inside the outer tube (4); the lengths of the inner tube and the outer tube (4) are adjusted by the adjusting device; and the top plate (8) is installed on the inner tube.

4. The prefabricated prestressed hollow slab floor construction support system according to claim 3 is characterized in that: The adjusting device comprises an adjusting nut (5), a pin (6) and a handle (7); the adjusting nut (5) is sleeved outside the outer tube (4); the pin (6) is inserted into the hole of the inner tube for positioning; and the handle (7) presses the pin (6) for fixing.

5. A construction method for the prefabricated prestressed hollow slab floor construction support system according to any one of claims 1 to 4, characterized in that: The specific steps include: (1) Select appropriate portal scaffolding (11) according to different storey heights and room lengths, and assemble two groups of portal scaffolding (11) at 100-200 mm from the wall side, select appropriate supporting scaffolding rods (14) according to the scaffolding span, connect a steel support top (9) to each portal scaffolding (11) frame 200-300 mm above the column close to the wall side, adjust the height according to the storey height, and simultaneously connect the steel support tops (9) on both sides with supporting scaffolding rods (14) to increase the horizontal rigidity, and the distance between the supporting scaffolding rods (14) and the bottom of the board is 250-400 mm; (2) Then, support beams (13) are installed in the U-shaped grooves of the steel support tops (9) on both sides, so that the two rows of support units are connected to form a support system; (3) Forming the ring beam concrete. After the floor slab is installed, the ring beam is formed on the floor slab and the wall. The ring beam formwork angle steel (15) is used as the side formwork. The steel pipe and the ring beam side formwork support (12) are adjusted to the right angle to support the side formwork using the rotating buckle (10).

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