CN114892532A - One-step forming coaxial rotary drawing type box girder steel mold construction method - Google Patents
One-step forming coaxial rotary drawing type box girder steel mold construction method Download PDFInfo
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- CN114892532A CN114892532A CN202210614791.1A CN202210614791A CN114892532A CN 114892532 A CN114892532 A CN 114892532A CN 202210614791 A CN202210614791 A CN 202210614791A CN 114892532 A CN114892532 A CN 114892532A
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- box girder
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
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- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a construction method of a one-step molding coaxial rotary drawing type box girder steel mold, and relates to the technical field of building construction. The one-step forming coaxial rotary drawing type box girder steel mould construction method specifically comprises the following steps: s1, mounting a bottom die, wherein a pedestal foundation under a bottom plate has enough rigidity and is stable in foundation, so that the phenomenon of sinking is avoided in the process of beam manufacturing, the flatness of the bottom die is controlled to be 2mm/m, and the bottom plate is mounted; s2, installing side templates, welding the side templates into a whole along the length of the beam, installing the templates through a jack, an adjusting screw rod, a track and rolling wheels, and controlling the verticality and the size of the bridge deck of the templates through a hydraulic jack at an outer side supporting leg of the side template; and S3, installing an end die, wherein the end die adopts an integral mechanical detachable end die, and a pre-stressed pore passage is reserved and strictly arranged according to a design drawing. The one-step molding coaxial rotary drawing type box girder steel mold construction method is convenient to demold and high in construction safety.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method of a one-step forming coaxial rotary pull type box girder steel mold.
Background
A large number of templates are needed in the bridge construction process, steel structure templates are mostly adopted in bridge erection construction due to frequent use, and box girder structure forms are mostly adopted in hoisting equipment, so that people gradually use the box girder templates to widely refer to bridge girder erection machine series products.
The prior patent (CN103572707A) discloses a box girder steel outer template and a construction method. The template comprises a steel truss system, an external template system and a template reinforcing system; the steel truss system consists of lateral steel trusses respectively positioned at the left side and the right side of the bridge, and each lateral steel truss consists of a plurality of steel truss groups which are arranged in parallel along the longitudinal direction of the bridge and are sequentially connected; the external template system is composed of a plurality of templates arranged on the surface of the steel truss system, and the template reinforcing system is composed of a plurality of groups of tie rods arranged in parallel. The invention relates to a box girder steel outer template and a construction method thereof, which is characterized in that the whole assembly, adjustment and reinforcement of the outer template are carried out on a well erected box girder bracket; the method can solve the problems that the box girder outer formwork is free of support, large in material consumption, low in formwork turnover rate, poor in appearance quality and the like, provides an outer formwork assembling way capable of adjusting the size of the formwork, and can improve the utilization rate of the box girder outer formwork during rapid construction. In addition, the device can adjust the whole width in a mode of adjusting the transverse pull rod, and is very convenient and practical. Although this method can be used, the construction safety is low and the mold release is excessively troublesome.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a construction method for a one-step molding coaxial rotary pull type box girder steel mold, which solves the problems of low construction safety and excessive demoulding trouble.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a construction method for a one-step molding coaxial rotary drawing type box girder steel mold specifically comprises the following steps:
s1, bottom die installation
The foundation of the pedestal under the bottom plate has enough rigidity and stable foundation, so that the phenomenon of sinking is avoided in the process of beam making, the flatness of the bottom plate is controlled to be 2mm/m, and the bottom plate is installed;
s2, mounting of side templates
The side forms are welded into a whole along the length of the beam, the installation of the side forms is carried out through a jack, an adjusting screw rod, a track and a rolling wheel, and the verticality and the size of the bridge deck of the side forms are controlled by the hydraulic jack at the outer side supporting leg;
s3, end die installation
The end die adopts an integral mechanical detachable end die, and a pre-stressed duct is arranged strictly according to a design drawing;
s4, internal mold installation
The inner membrane plate is formed by combining two templates, the two templates are hinged together by two smaller templates, the upper part and the lower part of the inner template are fixed by two telescopic frameworks, and the two sides of the inner template are fixed by support rods and pins;
s5, inner mold dismantling
Firstly, removing two supporting rods through pins, then removing a telescopic framework on one side, adjusting the height of the framework by using a template without the telescopic framework removed on the other side, simultaneously bending the upper end downwards, then pulling out the template by using a winch, and then pulling out the rest template after adjusting the height of the framework by using the telescopic framework and simultaneously bending the upper end downwards by using the winch;
s6, finally removing the mold
And the side die, the bottom die and the end die are disassembled in a corresponding sequence through a jack, an adjusting screw rod, a track and a rolling wheel.
Preferably, the method further comprises shortening the length of the beam due to the elastic compression of the beam body and the creep and shrinkage effects of the concrete during the pre-stressing, so that the total length of the bottom die is adjusted by considering the compression amount during the manufacturing of the bottom die, and the compression amount of each type of beam body is adjusted according to specific conditions and statistical data after the beam body is completely stretched.
Preferably, the method further comprises the step of presetting an inverted arch for the beam body in order to reduce the camber generated by prestress and ensure the smoothness of the line in the operating state, wherein the inverted arch is arranged according to a quadratic parabola and a quadratic parabola, and the inverted arch is determined according to the shrinkage and creep influence of the beam body and the second-stage constant load bridge-loading time in actual construction.
Preferably, the method also comprises the step of considering the compression amount of the whole length of the side die when the side die is installed, wherein the adjustment is carried out according to specific conditions and statistical data after the beam body is tensioned as the bottom die is installed.
Preferably, the method further comprises the step of connecting the side die with the bottom die and filling rubber by bolts, so that the slurry is prevented from leaking after the installation is finished.
Preferably, the method further comprises the step of dismantling the formwork after the beam concrete is poured and maintained to reach the strength of 60% of the designed strength, when the formwork is dismantled, the difference between the concrete core and the concrete surface, between the concrete surface and the ambient temperature is not more than 15 ℃, the formwork is not dismantled when strong wind or the air temperature changes rapidly, the formwork is not dismantled when the ambient temperature is lower than 0 ℃ in cold seasons, and the formwork is dismantled section by section and the side covers are dismantled when the ambient temperature is dry in hot and strong wind seasons.
Preferably, the method also comprises the steps of strictly prohibiting throwing of the disassembled parts, lightly taking the disassembled parts, timely cleaning and oiling the disassembled parts, classifying and stacking the disassembled parts, timely finishing the disassembled parts with larger damage or deformation, and ensuring the continuity and usability of the template.
Preferably, the method further comprises the steps of checking whether all the parts are complete and intact before working, whether a steel structure is deformed or not, whether a welding seam is cracked or not, whether a connecting piece is loosened or not, whether all elements of a hydraulic system are intact or not, whether the height of a hydraulic oil level is proper or not, whether a hydraulic oil pipe is corroded or not, whether hydraulic oil is leaked or not, whether each operating handle is in a proper position or not, whether a power phase sequence is correct or not, and whether a power line, a power socket, an electric appliance switch and an electric appliance are intact or not.
(III) advantageous effects
The invention provides a construction method of a one-step molding coaxial rotary drawing type box girder steel mold. The method has the following beneficial effects:
1. the construction method for the one-step molding coaxial rotary drawing type box girder steel die has a complete set of construction modes, is very safe in the construction process, and is very quick in demolding, so that the working efficiency can be greatly improved by the one-step molding coaxial rotary drawing type box girder steel die construction method.
Drawings
FIG. 1 is a schematic structural view of the formwork in a concrete pouring state according to the present invention;
FIG. 2 is a schematic structural view of a preliminary mold release state of the present invention;
FIG. 3 is a schematic structural view of a further demolding transition state of the present invention.
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.
Example (b):
as shown in fig. 1 to 3, an embodiment of the present invention provides a one-step forming coaxial rotary pull type box girder steel mold construction method, which specifically includes the following steps:
s1, bottom die installation
The foundation of the pedestal under the bottom plate has enough rigidity and stable foundation, so that the phenomenon of sinking is avoided in the process of beam making, the flatness of the bottom plate is controlled to be 2mm/m, and the bottom plate is installed;
s2, mounting of side templates
The side forms are welded into a whole along the length of the beam, the installation of the side forms is carried out through a jack, an adjusting screw rod, a track and a rolling wheel, and the verticality and the size of the bridge deck of the side forms are controlled by the hydraulic jack at the outer side supporting leg;
s3, end die installation
The end die adopts an integral mechanical detachable end die, and a pre-stressed duct is arranged strictly according to a design drawing;
s4, internal mold installation
The inner membrane plate is formed by combining two templates, the two templates are hinged together by two smaller templates, the upper part and the lower part of the inner template are fixed by two telescopic frameworks, and the two sides of the inner template are fixed by support rods and pins;
s5, inner mold dismantling
Firstly, two support rods are dismantled through pins, then a telescopic framework on one side is dismantled, a template on the other side, without the telescopic framework dismantled, is used for adjusting the height of the framework, the upper end of the template is bent downwards, then the template is pulled out by a winch, and the remaining template is pulled out after the height of the template is adjusted through the telescopic framework and the upper end of the template is bent downwards;
s6, finally removing the mold
And the side mold, the bottom mold and the end mold are disassembled in a corresponding sequence through a jack, an adjusting screw rod, a track and a rolling wheel.
The method also comprises that when pre-stressing, the elastic compression of the beam body and the creep and contraction influence of the concrete shorten the length of the beam, so the compression amount is considered in the whole length when manufacturing the bottom die, the compression amount of each type of beam body is adjusted according to specific conditions and statistical data after the beam body is completely stretched, the method also comprises the steps of presetting the reverse arch of the beam body in order to reduce the upper arch degree generated by the pre-stressing and ensure the smoothness of the line under the operation state, thereby increasing the stability, arranging the reverse arch according to a secondary parabola, and determining the impact of the shrinkage creep of the beam body and the time of loading the bridge under the second-stage constant load in the actual construction.
The method also includes that the compression amount of the whole length of the side die is considered when the side die is installed, the compression amount is the same as that when the bottom die is installed, the adjustment is carried out according to specific conditions and statistical data after the beam body is tensioned, the side die is connected with the bottom die and filled with rubber through bolts, the grout leakage after the installation is ensured, the template can be dismantled after the beam body is cured after concrete pouring is finished, the difference between the concrete core part and the concrete surface, the concrete surface and the ambient temperature is not more than 15 ℃, the template is not suitable to be dismantled when the strong wind or the air temperature changes rapidly, the template is not suitable to be dismantled when the ambient temperature is lower than 0 ℃ in cold seasons, and the template is required to be dismantled section by section and the side covers are dismantled when the ambient temperature is lower than 0 ℃, so that the quality of the building can be effectively ensured.
The method also comprises the steps of strictly prohibiting throwing of the detached parts, lightly taking and lightly placing the detached parts, timely cleaning and oiling, sorting and stacking, timely finishing damage or large deformation during detachment, ensuring the continuity and usability of the template, checking whether all the parts are complete and intact before working, whether a steel structure is deformed or not, whether a welding seam is cracked or not, whether a connecting piece is loosened or not, checking whether all elements of a hydraulic system are intact or not, whether the oil level of hydraulic oil is proper or not, whether a hydraulic oil pipe is corroded or not, preventing leakage of the hydraulic oil, whether all operating handles are in proper positions or not, checking whether the phase sequence of a power supply is correct or not, and whether a power line, a power socket, an electrical switch and an electrical appliance are intact or not, so that the construction safety is improved, and accidents are avoided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A construction method of a one-step molding coaxial rotary drawing type box girder steel mold is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, bottom die installation
The foundation of the pedestal under the bottom plate has enough rigidity and stable foundation, so that the phenomenon of sinking is avoided in the process of beam making, the flatness of the bottom plate is controlled to be 2mm/m, and the bottom plate is installed;
s2, mounting of side templates
The side forms are welded into a whole along the length of the beam, the installation of the side forms is carried out through a jack, an adjusting screw rod, a track and a rolling wheel, and the verticality and the size of the bridge deck of the side forms are controlled by the hydraulic jack at the outer side supporting leg;
s3, end die installation
The end die adopts an integral mechanical detachable end die, and a pre-stressed duct is arranged strictly according to a design drawing;
s4, internal mold installation
The inner membrane plate is formed by combining two templates, the two templates are hinged together by two smaller templates, the upper part and the lower part of the inner template are fixed by two telescopic frameworks, and the two sides of the inner template are fixed by support rods and pins;
s5, inner mold dismantling
Firstly, two support rods are dismantled through pins, then a telescopic framework on one side is dismantled, a template on the other side, without the telescopic framework dismantled, is used for adjusting the height of the framework, the upper end of the template is bent downwards, then the template is pulled out by a winch, and the remaining template is pulled out after the height of the template is adjusted through the telescopic framework and the upper end of the template is bent downwards;
s6, finally removing the mold
And the side mold, the bottom mold and the end mold are disassembled in a corresponding sequence through a jack, an adjusting screw rod, a track and a rolling wheel.
2. The one-step forming coaxial rotary drawing type box girder steel mold construction method according to claim 1, characterized in that: the method also comprises the step of shortening the length of the beam due to the elastic compression of the beam body and the creep and shrinkage influence of the concrete during pre-stressing, so that the compression amount of the whole length of the bottom die is considered during manufacturing of the bottom die, and the compression amount of each type of beam body is adjusted according to specific conditions and statistical data after the beam body is completely stretched.
3. The one-step forming coaxial rotary drawing type box girder steel mold construction method according to claim 1, characterized in that: the method also comprises the steps that in order to reduce the camber generated by prestress and ensure the smoothness of the line in the operating state, the beam body is pre-provided with an inverted arch, the inverted arch is arranged according to a quadratic parabola and the inverted arch is determined according to the shrinkage and creep influence of the beam body and the second-stage constant load bridge-loading time in actual construction.
4. The one-step forming coaxial rotary drawing type box girder steel mold construction method according to claim 1, characterized in that: the method also comprises the steps that the compression amount of the whole length of the side die is considered when the side die is installed, the compression amount is the same as that when the bottom die is installed, and the adjustment is carried out according to specific conditions and statistical data after the beam body is tensioned.
5. The one-step forming coaxial rotary drawing type box girder steel mold construction method according to claim 1, characterized in that: the method also comprises the step that the side die is connected with the bottom die and the rubber filling through bolts, so that the slurry leakage is avoided after the installation.
6. The one-step forming coaxial rotary drawing type box girder steel mold construction method according to claim 1, characterized in that: the method also comprises the step of dismantling the formwork after the beam concrete is poured and maintained until the strength reaches 60% of the designed strength, wherein during formwork dismantling, the difference between the temperature of the concrete core and the temperature of the concrete surface, the temperature of the concrete surface and the ambient temperature is not more than 15 ℃, the formwork dismantling is not suitable when strong wind or the temperature is changed rapidly, the formwork dismantling is not suitable when the ambient temperature is lower than 0 ℃ in cold seasons, and the formwork dismantling and the side cover are required to be dismantled section by section in hot and strong wind dry seasons.
7. The one-step forming coaxial rotary drawing type box girder steel mold construction method according to claim 1, characterized in that: the method also comprises the steps that the disassembled parts are strictly forbidden to be thrown, should be lightly taken and lightly placed, cleaned and oiled in time, sorted and stacked, and timely repaired when the parts are damaged or deformed greatly during disassembly, so that the continuity and usability of the template are ensured.
8. The one-step forming coaxial rotary drawing type box girder steel mold construction method according to claim 1, characterized in that: the method also comprises the steps of checking whether all the parts are complete and intact before working, whether the steel structure is deformed or not, whether a welding seam is cracked or not, whether a connecting piece is loosened or not, checking whether all the elements of the hydraulic system are intact or not, whether the oil level of hydraulic oil is proper or not, whether a hydraulic oil pipe is corroded or not, whether the hydraulic oil is leaked or not, whether all the operating handles are in proper positions or not, checking whether the phase sequence of a power supply is correct or not, and checking whether a power line, a power socket, an electric appliance switch and an electric appliance are intact or not.
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| CN202210614791.1A CN114892532A (en) | 2022-05-31 | 2022-05-31 | One-step forming coaxial rotary drawing type box girder steel mold construction method |
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| CN202210614791.1A CN114892532A (en) | 2022-05-31 | 2022-05-31 | One-step forming coaxial rotary drawing type box girder steel mold construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116397551A (en) * | 2023-06-08 | 2023-07-07 | 北京住总基础设施建设集团有限责任公司 | Construction method of prefabricated box girder for bridge |
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2022
- 2022-05-31 CN CN202210614791.1A patent/CN114892532A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116397551A (en) * | 2023-06-08 | 2023-07-07 | 北京住总基础设施建设集团有限责任公司 | Construction method of prefabricated box girder for bridge |
| CN116397551B (en) * | 2023-06-08 | 2024-01-02 | 北京住总基础设施建设集团有限责任公司 | Construction method of prefabricated box girder for bridge |
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