CN111997366B - Air pressure formwork supporting technology construction method based on single-layer latticed shell structure - Google Patents
Air pressure formwork supporting technology construction method based on single-layer latticed shell structure Download PDFInfo
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- CN111997366B CN111997366B CN202010914610.8A CN202010914610A CN111997366B CN 111997366 B CN111997366 B CN 111997366B CN 202010914610 A CN202010914610 A CN 202010914610A CN 111997366 B CN111997366 B CN 111997366B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/32—Arched structures; Vaulted structures; Folded structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
Abstract
The invention discloses a construction method of an air pressure formwork supporting technology based on a single-layer latticed shell structure, which relates to the technical field of constructional engineering and comprises the following steps: (1) setting an air pressure control system; (2) unfolding and fixing the air film; (3) filling a first layer of gas film to the shape; (4) arranging a reinforcing belt; (5) increasing the air pressure to a predetermined state; (6) laying grids; (7) filling a second layer of air film, and lifting the first layer of air film and the grid upwards; (8) erecting pillars at two ends of the second layer of gas film; (9) inflating the rest gas films layer by layer, lifting layer by layer and erecting the columns layer by layer to the designated positions; (10) and releasing the air pressure to finish construction. The construction method of the inflatable membrane support is applied to a single-layer grid structure system, the inflatable membrane is used as a construction operation platform and a mould, the latticed shell is constructed by a layer-by-layer inflation and layer-by-layer lifting method, all construction processes are completed at a low altitude, and hidden danger is avoided.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a construction method of an air pressure formwork supporting technology based on a single-layer latticed shell structure.
Background
In recent years, the construction technology of the inflatable membrane bed-jig is perfected day by day, and the inflatable membrane bed-jig is very economical and practical in the construction of the concrete thin shell. The inflatable membrane jig frame construction technology is constructed by manufacturing an air pressure template, and the main process is as follows: the air mold is manufactured in a predetermined shape and fixed on a ring-shaped concrete foundation, and then inflated. The air pressure template is made of a thin film which can only bear tension. Such films are generally impermeable to air, since they are coated with plastic on a high-strength synthetic fiber fabric. The construction cost of the inflatable membrane jig frame construction technology is only 1/8 of a common formwork method, and the construction method is time-saving, labor-saving, high in construction speed and good in economic benefit.
The formwork mode of the traditional space grid structure is a full scaffold splicing plate mode. When the geometrical size and the structure of the scaffold meet the relevant requirements of the specification, the bearing capacity of the single-pipe vertical rod of the scaffold can reach 15 kN-35 kN under the general condition. The scaffold is convenient to assemble and disassemble and flexible to erect, but is only suitable for various structures with relatively regular planes and vertical surfaces, and needs to work high above the ground, so that certain potential safety hazards exist. The project is to apply the inflatable membrane support construction method to a single-layer reticulated shell structure system, the inflatable membrane is used as a construction operation platform and a mold, the reticulated shell is constructed by a layer-by-layer inflation and layer-by-layer lifting method, all construction processes are completed in a low altitude, and hidden danger is avoided.
Disclosure of Invention
In order to solve the technical problems, the invention provides a pneumatic formwork erecting technology construction method based on a single-layer reticulated shell structure.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a construction method of an air pressure formwork supporting technology based on a single-layer reticulated shell structure, which comprises the following steps:
(1) setting an air pressure control system;
(2) unfolding and fixing the air film;
(3) filling a first layer of gas film to the shape;
(4) arranging a reinforcing belt;
(5) increasing the air pressure to a predetermined state;
(6) laying grids;
(7) filling a second layer of air film, and lifting the first layer of air film and the grid upwards;
(8) erecting pillars at two ends of the second layer of gas film;
(9) inflating the rest gas films layer by layer, lifting layer by layer and erecting the columns layer by layer to the designated positions;
(10) and releasing the air pressure to finish construction.
Optionally, the air pressure control system comprises a blower, an inflation valve and an exhaust valve.
Optionally, the film in the step (2) is unfolded and fixed, and an air film is manufactured according to a preset shape in the construction process and is fixed on a concrete foundation.
Optionally, in the step (3), the first layer of air film is filled to the given shape, the polyurethane foam plastic is firstly sprayed on the inner surface of the first layer of air film after the first layer of air film is filled, and the minimum thickness of the polyurethane foam plastic is 51 mm.
Optionally, the step (10) releases the air pressure to complete construction, and when the latticed shell is lifted to the highest layer and the column is installed, the air pressure in the air film can be removed; and during air exhaust, the air is slowly exhausted layer by layer from the bottom layer.
Compared with the prior art, the invention has the following technical effects:
(1) the construction method of the inflatable membrane support is applied to a single-layer reticulated shell structure system, the inflatable membrane is used as a construction operation platform and a mould, the reticulated shell is constructed by a layer-by-layer inflation and layer-by-layer lifting method, all construction processes are completed in a low altitude, and hidden danger is avoided.
(2) The construction cost of the inflatable membrane jig frame construction technology is only 1/8 of a common formwork method, and the construction method is time-saving, labor-saving, high in construction speed and good in economic benefit.
(3) The defects of complex design, high labor intensity and high formwork cost of the construction method of the full framing scaffold are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic construction flow diagram of a construction method of the air pressure formwork supporting technology based on a single-layer latticed shell structure;
FIG. 2 is a schematic top layer inflation construction diagram of the construction method based on the single-layer latticed shell structure air pressure formwork technology;
FIG. 3 is a schematic diagram of standard layer inflation construction of the construction method based on the single-layer latticed shell structure air pressure formwork technology;
fig. 4 is a schematic diagram of bottom layer inflation construction of the air pressure formwork supporting technology construction method based on the single-layer latticed shell structure.
Description of reference numerals: 1. a blower inflation system; 2. an inflation inlet; 3. an exhaust port; 4. setting internal pressure; 5. a grid roof; 6. film material; 7. a lattice column; 8. inflating ports of each layer; 9. and air outlets of each layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, the present embodiment provides a construction method based on a single-layer latticed shell structure by using an air pressure formwork supporting technology, which includes the following steps:
(1) setting an air pressure control system; the air pressure control system comprises a blower, an inflation valve and an exhaust valve; each layer of air film is provided with an inflation inlet and an exhaust outlet; each inflation inlet is provided with an inflation valve, and each inflation valve is communicated with the air outlet of the air blower; each exhaust port is provided with an exhaust valve.
(2) Unfolding and fixing the air film; in the construction process, firstly, manufacturing an air film according to a preset shape and fixing the air film on a concrete foundation;
(3) filling a first layer of gas film to the shape; after the first air film is filled, firstly, polyurethane foam plastic is sprayed on the inner surface of the first air film, and the minimum thickness of the polyurethane foam plastic is 51mm
(4) Arranging a reinforcing belt;
(5) increasing the air pressure to a predetermined state;
(6) laying grids;
(7) filling a second layer of air film, and lifting the first layer of air film and the grid upwards;
(8) erecting pillars at two ends of the second layer of gas film;
(9) inflating the rest gas films layer by layer, lifting layer by layer and erecting the columns layer by layer to the designated positions;
(10) releasing air pressure to complete construction; when the latticed shell is lifted to the highest layer and the column is installed, the air pressure in the air film can be removed; and during air exhaust, the air is slowly exhausted layer by layer from the bottom layer. The columns used in this example are lattice columns.
The problems encountered in the construction process and the treatment are as follows:
(1) the net frame partially slides down
The assembly of the net frame during construction must be especially careful. Too fast assembly or incorrect assembly sequence can cause the net rack to slide and damage the inflatable membrane.
When aerifing the membrane and constructing as construction platform, if atmospheric pressure is not enough, the gas membrane will be unstable, produces great displacement to can make the rack from the landing on the gas membrane, light make the structure inefficacy, then can cause the casualties of personnel heavily. The required amount of air pressure in each project is greatly different, and the air pressure is adjusted on site according to the requirement. A smaller size reticulated shell requires higher air pressure. Conversely, a dome of larger size requires lower air pressure. The pressure range is generally controlled to 245-1244.6 Pa.
With sufficient air pressure and a properly designed air film fabric, drastic changes in air pressure can be avoided during construction. The stable inflation of the air film is necessary for eliminating the change of the volume in the assembling process of the net rack. Two sets of blowers and motors are typically required to ensure uninterrupted inflation and to ensure balanced lifting of the entire air film.
The slip of the reticulated shell after construction can be prevented by correct structural design and good quality control during construction. In order to guarantee the stability of rack, can use the tower crane to hang the rack in order to prevent to slide.
(2) Rupture of gas film and failure of moulding
In order to maintain the correct shape during construction, sufficient air pressure must be present inside the air film. A water tank of 18m diameter was built in the eastern utah united states, and a storm during construction caused the air film to collapse locally. In order to avoid such an accident, the air pressure is increased, thereby causing stretching of the air film. This additional stretching affects the retention of the polyurethane foam to the reticulated shell, causing the reticulated shell to slip off. Similar results may be achieved if snow storms and windy weather are encountered during construction.
As the size of the inflated membrane increases, the effect of internal air pressure becomes more critical. The stress in the air film fabric is proportional to the span. When the pressure is constant, the greater the span, the greater the stress on the air film web. Oversize structures with diameters above 61m require special care in controlling the air pressure to prevent the air film from tearing. To ensure sufficient air pressure to minimize changes, the mass of the air film fabric must have a sufficient safety factor and creep upon inflation must be minimal.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. A construction method of an air pressure formwork supporting technology based on a single-layer latticed shell structure is characterized by comprising the following steps:
(1) setting an air pressure control system;
(2) unfolding and fixing the air film;
(3) filling a first layer of gas film to the shape;
(4) arranging a reinforcing belt;
(5) increasing the air pressure to a predetermined state;
(6) laying grids;
(7) filling a second layer of air film, and lifting the first layer of air film and the grid upwards;
(8) erecting pillars at two ends of the second layer of gas film;
(9) inflating the rest gas films layer by layer, lifting layer by layer and erecting the columns layer by layer to the designated positions;
(10) and releasing the air pressure to finish construction.
2. The pneumatic formwork erecting technology construction method based on the single-layer latticed shell structure as claimed in claim 1, wherein the pneumatic control system comprises a blower, an inflation valve and an exhaust valve.
3. The pneumatic formwork erecting technology based on single-layer latticed shell structure as claimed in claim 1, wherein in the step (2), the film is unfolded and fixed, and in the construction process, the air film is firstly manufactured according to a preset shape and fixed on a concrete foundation.
4. The construction method of an air pressure formwork supporting technology based on a single-layer reticulated shell structure as claimed in claim 1, wherein the step (3) is to fill the first air film to a certain shape, and after the first air film is filled, the polyurethane foam is firstly sprayed on the inner surface of the first air film, and the minimum thickness of the polyurethane foam is 51 mm.
5. The construction method of the air pressure formwork supporting technology based on the single-layer latticed shell structure is characterized in that the construction is completed by releasing the air pressure in the step (10), and when the latticed shell is lifted to the highest layer and the column is installed, the air pressure in the air film can be removed; and during air exhaust, the air is slowly exhausted layer by layer from the bottom layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010914610.8A CN111997366B (en) | 2020-09-03 | 2020-09-03 | Air pressure formwork supporting technology construction method based on single-layer latticed shell structure |
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| CN202010914610.8A CN111997366B (en) | 2020-09-03 | 2020-09-03 | Air pressure formwork supporting technology construction method based on single-layer latticed shell structure |
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| CN111997366A CN111997366A (en) | 2020-11-27 |
| CN111997366B true CN111997366B (en) | 2021-11-23 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1222791A1 (en) * | 1984-03-30 | 1986-04-07 | Свердловский архитектурный институт | Versions of pneumatic forms for erecting monolithic three-dimensional roofs |
| DE3442904A1 (en) * | 1984-11-24 | 1986-06-05 | Hendrik Willem Zwolle Schelfhorst | Process for producing a building construction |
| JPH07207760A (en) * | 1994-01-10 | 1995-08-08 | I C D Kenchiku Sekkei Jimusho:Kk | Construction method of dome |
| CN102425326A (en) * | 2011-09-14 | 2012-04-25 | 徐州中煤百甲重钢结构有限公司 | Installation construction process of bolt net rack cylindrical shell storage bin |
| CN103669953A (en) * | 2013-12-09 | 2014-03-26 | 中煤建筑安装工程集团有限公司 | Construction method with space gas film as formwork |
| CN104131639A (en) * | 2014-08-11 | 2014-11-05 | 哈尔滨工业大学 | Inflatable chord latticed shell structure and construction method |
-
2020
- 2020-09-03 CN CN202010914610.8A patent/CN111997366B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1222791A1 (en) * | 1984-03-30 | 1986-04-07 | Свердловский архитектурный институт | Versions of pneumatic forms for erecting monolithic three-dimensional roofs |
| DE3442904A1 (en) * | 1984-11-24 | 1986-06-05 | Hendrik Willem Zwolle Schelfhorst | Process for producing a building construction |
| JPH07207760A (en) * | 1994-01-10 | 1995-08-08 | I C D Kenchiku Sekkei Jimusho:Kk | Construction method of dome |
| CN102425326A (en) * | 2011-09-14 | 2012-04-25 | 徐州中煤百甲重钢结构有限公司 | Installation construction process of bolt net rack cylindrical shell storage bin |
| CN103669953A (en) * | 2013-12-09 | 2014-03-26 | 中煤建筑安装工程集团有限公司 | Construction method with space gas film as formwork |
| CN104131639A (en) * | 2014-08-11 | 2014-11-05 | 哈尔滨工业大学 | Inflatable chord latticed shell structure and construction method |
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| CN111997366A (en) | 2020-11-27 |
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