CN117226992A - Device for prefabricating pretensioned hollow slab and construction method thereof - Google Patents
Device for prefabricating pretensioned hollow slab and construction method thereof Download PDFInfo
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- CN117226992A CN117226992A CN202311378804.0A CN202311378804A CN117226992A CN 117226992 A CN117226992 A CN 117226992A CN 202311378804 A CN202311378804 A CN 202311378804A CN 117226992 A CN117226992 A CN 117226992A
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- steel bar
- prefabricating
- cross beam
- hollow slab
- steel bars
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- 238000010276 construction Methods 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims description 17
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000009415 formwork Methods 0.000 claims 2
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000009417 prefabrication Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 9
- 239000002689 soil Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The invention discloses a device for prefabricating a pretensioned hollow slab and a construction method thereof, and relates to the field of hollow slab prefabrication construction. The device for prefabricating the pretensioned hollow slab comprises a bearing platform; at least one bored pile, which is arranged at the bottom of the bearing platform and is used for being inserted into the ground; a slab pedestal arranged at one side of the bearing platform and used for pouring concrete to form a hollow slab; and the steel bar dragging assembly is arranged at the top of the bearing platform and is used for stretching the steel bars passing over the plate-making pedestal. The bearing platform is fixed under the ground through the bored pile, so that horizontal stretching force caused by dragging the reinforcing steel bars in the pretensioned construction process of the hollow slab is borne through the bored pile, and the bored pile drills into the ground deeply, so that the bearing platform can bear large horizontal stretching force, the device can be suitable for special geology and complex environments, the engineering quantity of soft foundation treatment can be reduced, and the construction efficiency of the prefabricated pretensioned hollow slab is improved.
Description
Technical Field
The invention relates to the field of hollow slab prefabrication construction, in particular to a device for prefabricating a pretensioned hollow slab and a construction method thereof.
Background
In the construction of the pre-tensioned hollow slab, the common tensioning pedestal forms comprise a pre-stress pier type pedestal, a pre-stress groove type pedestal, a pre-stress framework type pedestal and a pre-stress embedded type pedestal. However, the four tensioning pedestals have high requirements on the foundation, and cannot be effectively suitable for prefabricating construction of the prefabricated hollow slab by the factory long-line method under special foundations (silt, soft soil, collapsible loess, frozen soil and the like) and complex environments (alpine regions, seasonal frozen soil regions, rainy regions and the like).
Before the construction is carried out by using the traditional device for prefabricating the pretensioned hollow slab, the soft foundation needs to be treated, so that the engineering quantity of the soft foundation treatment is increased, the influence of the expansion and contraction of the soil layer of the field on the pedestal is reduced, and the construction efficiency of the prefabricating the pretensioned hollow slab is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention solves the technical problems as follows: how to improve the construction efficiency of the pre-tensioned hollow slab.
To achieve the above object, the present invention provides an apparatus for prefabricating a pretensioned hollow slab, comprising:
bearing platform;
at least one bored pile, which is arranged at the bottom of the bearing platform and is used for being inserted into the ground;
a slab pedestal arranged at one side of the bearing platform and used for pouring concrete to form a hollow slab;
and the steel bar dragging assembly is arranged at the top of the bearing platform and is used for stretching the steel bars passing over the plate-making pedestal.
On the basis of the technology, two bearing platforms are arranged on two sides of a construction site, the reinforcing steel bar dragging assemblies on the two bearing platforms are in one-to-one correspondence, and the plate making pedestal is arranged on a straight line formed by connecting the reinforcing steel bar dragging assemblies on the two sides.
On the basis of the technology, a plurality of plate-making pedestals are arranged, and the sizes of the plate-making pedestals are the same or different.
On the basis of the technology, the steel bar dragging assemblies on the bearing platform are provided with a plurality of steel bar dragging assemblies, and one side of each steel bar dragging assembly is provided with a corresponding plate making pedestal.
On the basis of the technology, the steel bar dragging assembly comprises a bracket, a fixed beam, a pushing mechanism and a movable beam, wherein the bracket is arranged on one side of the fixed beam, which is close to the plate-making pedestal, one side of the fixed beam, which is far away from the plate-making pedestal, is connected with one end of the pushing mechanism, the other end of the pushing mechanism is connected with the movable beam, and the movable beam is used for stretching steel bars.
Based on the technology, a plurality of pushing mechanisms are arranged between the fixed cross beam and the movable cross beam.
On the basis of the technology, the embedded part is arranged in the bracket, and the bracket is connected with the fixed cross beam through the embedded part.
On the basis of the technology, a plurality of template mounting tables are arranged at the top of the plate making pedestal along the stretching direction of the steel bars, and hollow plate lifting holes are formed between the template mounting tables.
On the basis of the technology, the construction method of the prefabricated pretensioned hollow slab provided by the invention comprises the following steps:
installing a device for prefabricating the pretensioned hollow slab;
installing a template on a plate-making pedestal, binding steel bars on a steel bar dragging assembly, tensioning the steel bars bound on the steel bar dragging assembly one by one to enable each steel bar to be in a straight state, dragging the steel bars together through the steel bar dragging assembly, and anchoring the steel bars to a fixed cross beam through an anchor after the steel bars are stretched to a design load;
pouring hollow slab concrete in the template, curing, dismantling the template after the strength and age of the hollow slab concrete meet the requirements, releasing and stretching, cutting off redundant steel bars and sealing anchors to form the hollow slab.
On the basis of the technology, when binding the steel bars on the steel bar dragging assembly, the method further comprises the following steps: the steel bars between the plate making pedestal and the steel bar dragging assembly are connected through connectors.
Compared with the prior art, the invention has the advantages that:
according to the invention, the bored pile is arranged at the bottom of the bearing platform, the bored pile is drilled below the ground, the reinforcing steel bar dragging assembly is arranged on the bearing platform, and the plate making pedestal corresponding to the reinforcing steel bar dragging assembly is arranged on one side of the bearing platform. Compared with the existing device for prefabricating the pretensioned hollow slab, the bearing platform of the device is fixed below the ground through the bored pile, so that the bored pile is used for bearing horizontal tension force caused by dragging the steel bars in the pretensioned construction process of the hollow slab, and the bored pile is deeper in the ground, so that the bearing horizontal tension force is larger, and the device can be suitable for special geology and complex environments; and the bored pile can directly pass through a soft or special soil layer, and the pile end bearing layer is selected as a soil layer (friction pile) or a rock stratum (rock-socketed pile) with good properties. In summary, the device for prefabricating the pretensioned hollow slab can reduce the engineering quantity of soft foundation treatment when being used for construction of special geology and complex environments, thereby improving the construction efficiency of the pretensioned hollow slab.
Drawings
FIG. 1 is a first schematic view of an apparatus for prefabricating pre-tensioned hollow slabs in accordance with an embodiment of the present invention;
FIG. 2 is a second schematic structural view of an apparatus for prefabricating pre-tensioned hollow slabs according to an embodiment of the present invention;
fig. 3 is a top view of fig. 1.
In the figure: the device comprises a 1-bearing platform, a 2-bored pile, a 3-bracket, a 4-template mounting platform, a 5-fixed cross beam, a 6-movable cross beam, a 7-pushing mechanism, an 8-plate-making pedestal, a 9-ground, a 10-anchorage, 11-connectors and 12-steel bars.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the device for prefabricating a pretensioned hollow slab in the embodiment of the invention comprises a bearing platform 1, wherein at least one bored pile 2 is arranged at the bottom of the bearing platform 1, the bored piles 2 are uniformly distributed at the bottom of the bearing platform 1, and the whole section of the bored pile 2 is drilled into the ground; a slab pedestal 8 is arranged on one side of the bearing platform 1, a template for manufacturing the hollow slab is erected on the slab pedestal 8, and concrete is poured in the template to form the hollow slab; the top of the bearing platform 1 is provided with a steel bar dragging assembly, when the hollow slab is manufactured, the steel bars embedded in the hollow slab need to be stretched before concrete pouring, the steel bars are suspended above the slab pedestal 8, and the steel bar dragging assembly is used for stretching the steel bars passing through the upper part of the slab pedestal 8.
Therefore, the invention is characterized in that the bored pile is arranged at the bottom of the bearing platform, the bored pile is drilled below the ground, the reinforcing steel bar dragging assembly is arranged on the bearing platform, and the plate making pedestal corresponding to the reinforcing steel bar dragging assembly is arranged on one side of the bearing platform. Compared with the existing device for prefabricating the pretensioned hollow slab, the bearing platform of the device is fixed below the ground through the bored pile, so that the bored pile is used for bearing horizontal tension force caused by dragging the steel bars in the pretensioned construction process of the hollow slab, and the bored pile is deeper in the ground, so that the bearing horizontal tension force is larger, and the device can be suitable for special geology and complex environments; and the bored pile can directly pass through a weak or special soil layer, and the pile end bearing layer is selected as a soil layer or a rock stratum with better properties. In summary, the device for prefabricating the pretensioned hollow slab can reduce the engineering quantity of soft foundation treatment when being used for construction of special geology and complex environments, thereby improving the construction efficiency of the pretensioned hollow slab.
Specifically, a factory device design is provided:
the two ends of the construction site are provided with bearing platforms 1, the bottoms of the two bearing platforms 1 are respectively fixed with a plurality of bored piles 2 which are drilled into the ground, most of the bearing platforms 1 are buried into the ground, the two bearing platforms 1 are respectively provided with a reinforcing steel bar dragging assembly, the two bearing platforms 1 pull up two reinforcing steel bar dragging assemblies of the same reinforcing steel bar 12 into a group, the reinforcing steel bar dragging assemblies on the two bearing platforms 1 can be 1, 2 or more groups, the construction site can be designed according to the size and construction requirement of the construction site, a plate-making pedestal 8 is arranged on a straight line between each group of reinforcing steel bar dragging assemblies, and the table top of the plate-making pedestal 8 is basically flush with the bottom surface 9.
Further, the number of the plate-making pedestals 8 on the straight line between each group of the reinforcing bar dragging components can be designed according to the space between the reinforcing bar dragging components at two sides, and the design sizes of the plate-making pedestals 8 on one straight line can be the same or different.
It should be noted that, a plurality of steel bar dragging components may be disposed on one pile cap 1, so as to satisfy that the pile cap 1 can bear larger tension force, and the number of the bored piles 2 at the bottom of the pile cap 1 may be increased, or the depth of the bored piles 2 into the ground may be increased.
Preferably, the steel bar dragging assembly comprises a bracket 3, a fixed cross beam 5, a pushing mechanism 7 and a movable cross beam 6, wherein a support frame is arranged on one side, close to a plate-making pedestal 8, of the fixed cross beam 5, the support frame can be the bracket 3, the bracket 3 can be connected with a bearing platform 1 through welding or embedded parts, one side, far away from the plate-making pedestal 8, of the fixed cross beam 5 is connected with one end of the pushing mechanism 7, the other end of the pushing mechanism 7 is connected with the movable cross beam 6, and the movable cross beam 6 is used for stretching steel bars 12.
The shape of the fixed beam 5 and the movable beam 6 is preferably square, specifically, double-spliced H-shaped steel, or a box section, and the steel bars can be anchored on the fixed beam 5 and the movable beam 6 through anchors.
The design has the advantages that: the steel bar needs to be stretched with larger force, in order to avoid falling of the steel bar caused by insufficient firmness between the steel bar and the fixed cross beam 5 or the movable cross beam 6 in the stretching operation process, the shapes of the fixed cross beam 5 and the movable cross beam 6 are designed into square columns, the plane of the fixed cross beam 5 is propped against the bottom surface of the pushing mechanism 7, and the plane of the movable cross beam 6 is propped against the top surface of the pushing mechanism 7, so that the stress is uniform, and the steel bar stretching device has better stability.
Further, the number of the pushing mechanisms 7 between the fixed cross beam 5 and the movable cross beam 6 can be 1, 2 or more, and the pushing mechanisms 7 are uniformly distributed between the fixed cross beam 5 and the movable cross beam 6, so that the tensile force born by the steel bars fixed on the steel bar dragging assembly is relatively uniform.
The design has the advantages that: the number of the pushing mechanisms 7 between the fixed cross beam 5 and the movable cross beam 6 can be designed according to the size of the stretching force required by the steel bars, so that the method is suitable for manufacturing hollow plates with different types.
Further, the bracket 3 is provided with a mounting assembly inside, and specifically, the mounting assembly can be an embedded part or a clamping connector, so that the fixed cross beam 5 can be connected with the mounting assembly.
The design has the advantages that: in the process of the steel bar stretching operation, the stress of the fixed cross beam 5 is larger, so that the stability of the fixed cross beam 5 is ensured, and the bracket 3 and the installation component inside the bracket are designed, so that the stability of the fixed cross beam 5 is increased.
Preferably, a plurality of template mounting tables 4 are arranged at the top of the plate-making pedestal 8 along the stretching direction of the reinforcing steel bars 12, hollow plate lifting holes are formed between the template mounting tables 4, after the manufacture of a section of hollow plate is completed, lifting ropes can penetrate through the lifting holes, and then the section of hollow plate is lifted and moved to a plate storage area through a gantry crane.
The invention provides a construction method of a prefabricated pretensioned hollow slab, which comprises the following steps:
s1: the ground surface cleaning table in the field range is used for synchronously constructing hollow slab prefabricated structures such as a bearing platform 1, a slab pedestal 8, a slab storage pedestal, a reinforcement binding pedestal, a gantry rail foundation and the like and buildings;
s2: assembling a gantry crane, and installing a fixed cross beam 5, a horizontal tensioning jack and a movable cross beam 6;
s3: installing a template on the plate-making pedestal 8, binding the steel bars 12 on the steel bar dragging assembly, tensioning the steel bars 12 bound on the steel bar dragging assembly one by one to ensure that each steel bar 12 is in a straightened state, dragging the steel bars 12 together through the steel bar dragging assembly, and anchoring the steel bars 12 to the fixed cross beam 5 through the anchor 10 after the steel bars 12 are stretched to a design load;
s4: pouring hollow slab concrete in the template, curing, dismantling the template after the strength and age of the hollow slab concrete meet the requirements, releasing and stretching, cutting off redundant steel bars 12 and sealing anchors to form a hollow slab;
s5: the hollow slab is hoisted and moved to a slab storage area through a gantry crane;
s6: and (3) trimming the template, and repeating the steps of manufacturing the hollow slab until the construction of prefabricating the hollow slab by a pretensioning method is completed.
Further, when binding the reinforcing steel bar 12 on the reinforcing steel bar dragging assembly, the method further comprises the following steps: the bar 12 between the plate-making stand 8 and the bar-pulling assembly is connected by a connector 11.
The design has the advantages that: after the hollow plate is formed, the redundant reinforcing steel bars are required to be cut off, so that the waste of the reinforcing steel bars is avoided, and the cutting work of the reinforcing steel bars is reduced, so that the parts, which need to be cut off, of the reinforcing steel bars are connected through the connectors 11, and after the hollow plate is formed, the cutting work of the reinforcing steel bars can be completed only by dismantling the connectors 11, so that the redundant reinforcing steel bars can be reused, and the construction cost is reduced.
The invention is not limited to the above-mentioned best mode, any person can obtain other various products under the teaching of the invention, but any change in shape or structure is within the scope of protection of the invention, and all the technical schemes are the same or similar to the invention.
Claims (10)
1. An apparatus for prefabricating pre-tensioned hollow slabs, comprising:
a bearing platform (1);
at least one bored pile (2) arranged at the bottom of the pile cap (1) for insertion into the ground;
a slab pedestal (8) which is arranged on one side of the bearing platform (1) and is used for pouring concrete to form a hollow slab;
and the steel bar dragging assembly is arranged at the top of the bearing platform (1) and is used for stretching the steel bars passing over the plate-making pedestal (8).
2. An apparatus for prefabricating pre-tensioned hollow slabs according to claim 1 wherein: the two bearing platforms (1) are arranged, the two bearing platforms (1) are arranged on two sides of a construction site, the reinforcing steel bar dragging assemblies on the two bearing platforms (1) are in one-to-one correspondence, and the plate making pedestal (8) is arranged on a straight line formed by connecting the reinforcing steel bar dragging assemblies on the two sides.
3. An apparatus for prefabricating pre-tensioned hollow slabs according to claim 2 wherein: the number of the plate-making pedestals (8) is several, and the sizes of the plate-making pedestals (8) are the same or different.
4. An apparatus for prefabricating pre-tensioned hollow slabs according to claim 1 wherein: the steel bar dragging components on the bearing platform (1) are provided with a plurality of steel bar dragging components, and one side of each steel bar dragging component is provided with a corresponding plate-making pedestal (8).
5. An apparatus for prefabricating pre-tensioned hollow slabs according to claim 1 wherein: the steel bar dragging assembly comprises a bracket (3), a fixed cross beam (5), a pushing mechanism (7) and a movable cross beam (6), wherein the bracket (3) is arranged on one side, close to a plate-making pedestal (8), of the fixed cross beam (5), one side, far away from the plate-making pedestal (8), of the fixed cross beam (5) is connected with one end of the pushing mechanism (7), the other end of the pushing mechanism (7) is connected with the movable cross beam (6), and the movable cross beam (6) is used for stretching steel bars (12).
6. An apparatus for prefabricating pre-tensioned hollow slabs according to claim 5 wherein: the pushing mechanisms (7) between the fixed cross beam (5) and the movable cross beam (6) are provided in a plurality.
7. An apparatus for prefabricating pre-tensioned hollow slabs according to claim 5 wherein: the bracket is characterized in that embedded parts are arranged in the bracket (3), and the bracket (3) is connected with the fixed cross beam (5) through the embedded parts.
8. An apparatus for prefabricating pre-tensioned hollow slabs according to claim 1 wherein: the top of the slab pedestal (8) is provided with a plurality of formwork installation tables (4) along the stretching direction of the reinforcing steel bars (12), and hollow slab lifting holes are formed between the formwork installation tables (4).
9. The construction method of the pre-tensioned hollow slab is characterized by comprising the following steps of:
providing an apparatus for prefabricating pre-tensioned hollow slabs according to any one of claims 1 to 8;
installing a template on a plate-making pedestal (8), binding steel bars (12) on a steel bar dragging assembly, tensioning the steel bars (12) bound on the steel bar dragging assembly one by one, enabling each steel bar (12) to be in a straight state, dragging the steel bars (12) together through the steel bar dragging assembly, and anchoring the steel bars (12) to a fixed cross beam (5) through an anchor (10) after the steel bars (12) are stretched to a design load;
pouring hollow slab concrete in the template, curing, dismantling the template after the strength and age of the hollow slab concrete meet the requirements, releasing and stretching, cutting off redundant steel bars (12) and sealing anchors to form the hollow slab.
10. A method of constructing a preformed pre-tensioned hollow slab according to claim 9 wherein the step of binding the rebar (12) on the rebar pulling assembly further comprises the steps of: the steel bars (12) between the plate making pedestal (8) and the steel bar dragging assembly are connected through connectors (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311378804.0A CN117226992A (en) | 2023-10-23 | 2023-10-23 | Device for prefabricating pretensioned hollow slab and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311378804.0A CN117226992A (en) | 2023-10-23 | 2023-10-23 | Device for prefabricating pretensioned hollow slab and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117226992A true CN117226992A (en) | 2023-12-15 |
Family
ID=89084262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311378804.0A Pending CN117226992A (en) | 2023-10-23 | 2023-10-23 | Device for prefabricating pretensioned hollow slab and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117226992A (en) |
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2023
- 2023-10-23 CN CN202311378804.0A patent/CN117226992A/en active Pending
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