CN214882997U - Movable template bridge wet joint structure based on ECC material - Google Patents
Movable template bridge wet joint structure based on ECC material Download PDFInfo
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- CN214882997U CN214882997U CN202120402429.9U CN202120402429U CN214882997U CN 214882997 U CN214882997 U CN 214882997U CN 202120402429 U CN202120402429 U CN 202120402429U CN 214882997 U CN214882997 U CN 214882997U
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- 238000010276 construction Methods 0.000 claims abstract description 45
- 238000009415 formwork Methods 0.000 claims description 50
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The utility model discloses a belong to bridge construction technical field, specifically be a movable template bridge wet joint structure based on ECC material, this structure draws, the pressure intensity is high, the durability is good, can effectively guarantee wet joint interface ECC concrete material's performance continuity, and have advantages such as construction convenience, easy maintenance, can solve the difficult problem of ECC material wet joint connection quality, the movable template of taking simultaneously, on the one hand greatly made things convenient for the construction, on the other hand has practiced thrift a large amount of steel, has very strong economic nature; the movable template is designed to be formed by hinging a plurality of sections of small steel bottom templates, so that the template transportation space can be saved, the template transportation is facilitated, the template installation is simplified, the construction progress is improved, and the movable template can be conveniently taken out after one wet joint is poured. In addition, the structural design allows for self-assembly of a movable form of a desired length according to a desired wet joint length, which greatly facilitates construction.
Description
Technical Field
The utility model relates to a bridge structures technical field specifically is a movable template bridge wet joint structure based on ECC material.
Background
Wet joints are frequently damaged and difficult to repair in bridge construction. When the wet joint is damaged, obvious vehicle impact effect can be generated, driving conditions are reduced, and the service life of the bridge is also influenced. And for the earthquake-prone area, when the earthquake comes, the damage of the beam bridge is mainly caused by the damage of falling beams and the like due to poor integrity, and the pouring of the wet joint is particularly important.
The existing construction pouring of wet joints, namely, the installation and the disassembly of templates are carried out by using steel wires and screws, so that workers often carry out overhead suspension operation, and the construction pouring has high danger. And the installation and the dismantlement of template have a lot of inconveniences, have lengthened the engineering time, have drawn construction efficiency down. And permanent mounting holes may be left for the wet joints during the mounting and dismounting of the formwork, resulting in stress concentration and breaking of the continuity of the wet joints. Even secondary filling can affect the continuity of the wet seam. The existing wet joint structure design for creating the template can enable workers to avoid high-altitude suspension operation, but has the defects that steel consumption is high, cost is high, the template is inconvenient to install, construction difficulty is high, construction time is prolonged, construction efficiency is lowered, and therefore the method is not widely pushed.
The ultra-high-toughness cement-based composite material (abbreviated as ECC in English name) shows excellent deformability under the action of static tensile load, the ultimate tensile strain can stably reach more than 3%, and the ECC has good energy consumption capability under the action of impact in the aspect of dynamic mechanical property; in the drop hammer test, compared with reinforced concrete and steel fiber concrete, the hybrid fiber ECC has less impact damage and more energy consumption; the reasonable use of the fiber mixing amount, the fly ash mixing amount and the water-cement ratio can enhance the bending toughness of the ultra-high toughness cement-based composite material. Meanwhile, the ECC also has excellent water resistance, ion permeability resistance, freeze-thaw resistance and the like, and has excellent application performance in steel bridge deck pavement.
The existing research of applying ECC to wet joints mainly introduces a plurality of matters of applying ECC to wet joint experiments, and mainly comprises the problems of construction technology, process, durability and appearance quality. The ultra-high-toughness cement-based composite material fully utilizes fly ash which is a byproduct of a power plant to replace cement which is a heavy energy consumption product, and adopts an ECC material which is doped with a large amount of fly ash in a mixing ratio to carry out wet joint construction, so that the environmental pollution can be reduced, and the low-carbon and environment-friendly construction can be realized. Finally, the ECC has ultrahigh toughness, so that the problems of formation and cracking of common concrete cracks can be solved, and the impermeability and durability of the bridge are improved.
The existing structural design applying ECC to wet joints is mainly a segmented bridge deck wet joint connection form. The wet joint structure comprises a plurality of precast concrete bridge deck plates erected on the longitudinal beam, and wet joints along the bridge direction are formed between every two adjacent precast concrete bridge deck plates at intervals. And one side of the precast concrete bridge deck, which is close to the wet joint, is provided with an upper layer embedded steel bar and a lower layer embedded steel bar which extend to the outer side of the precast concrete bridge deck. The ultra-high toughness cement-based composite material is cast in the wet joint, and two adjacent precast concrete bridge decks are connected into a whole through adjacent wet joint concrete. The wet joint structure is mainly used for improving the capacity of the wet joint for transferring shearing force and bending moment and preventing the generation and the propagation of cracks at the wet joint. However, it still cannot solve the problems of difficult construction, high construction risk, and the like.
SUMMERY OF THE UTILITY MODEL
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract of the specification and the title of the application to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or other problems occurring in the existing wet joint structure of bridges.
Therefore, the utility model aims at providing a portable template bridge wet joint structure based on ECC material, draw, the pressure intensity is high, the durability is good, can effectively guarantee wet joint interface ECC concrete material's performance continuity, and have construction convenience, easy maintenance advantage etc. can solve the difficult problem of ECC material wet joint connection quality, the portable template of self-carrying simultaneously, on the one hand greatly made things convenient for the construction, on the other hand has practiced thrift a large amount of steel, has very strong economic nature; the movable template is designed to be formed by hinging a plurality of sections of small steel bottom templates, so that the template transportation space can be saved, the template transportation is facilitated, the template installation is simplified, the construction progress is improved, and the movable template can be conveniently taken out after one wet joint is poured. In addition, the structural design allows for self-assembly of a movable form of a desired length according to a desired wet joint length, which greatly facilitates construction.
For solving the technical problem, according to the utility model discloses an aspect, the utility model provides a following technical scheme:
an ECC material based movable form bridge wet joint structure, comprising: the construction comprises a prefabricated section, a wet joint section and a movable steel bottom template; the prefabricated section bridge deck is made of ECC materials; the movable steel bottom template is arranged on a track preset at the embedding position of the extension template at the bottom of the bridge floor of the prefabricated section and is butted into a continuous integrated structure to serve as a bottom template of the wet joint section; the wet joint section is supported on the movable steel bottom template and connected with the prefabricated section in a pouring mode, the wet joint section is continuously laid, the wet joint section and the bridge deck are equal in thickness, and ECC materials identical to those of the bridge deck are adopted.
As an ECC material based wet seam structure of portable template bridge preferred scheme, wherein: the precast section comprises a beam bridge deck precast slab, precast slab upper-layer longitudinal steel bars and precast slab lower-layer longitudinal steel bars, wherein the precast slab is longitudinally arranged in the precast slab and made of the same ECC material as the bridge deck; the movable steel bottom template is arranged on a track at a pre-made embedding position on a bottom extending template part prefabricated in the beam bridge deck precast slab and is butted to form a bottom template; the wet joint section comprises wet joint upper layer longitudinal steel bars, wet joint lower layer transverse steel bars, wet joint upper layer transverse steel bars, wet joint lower layer longitudinal steel bars and wet joint cast-in-situ sections; the upper-layer longitudinal steel bars and the lower-layer transverse steel bars of the wet joints are in lap joint and bound with the upper-layer longitudinal steel bars and the lower-layer longitudinal steel bars of the prefabricated plates into a whole, and the upper-layer transverse steel bars of the wet joints are in lap joint and bound with the upper-layer longitudinal steel bars of the wet joints into a whole; the transverse steel bars at the lower layer of the wet joint and the longitudinal steel bars at the lower layer of the wet joint are overlapped and bound into a whole; the wet joint cast-in-place section is cast in the wet joint section by adopting an ECC material the same as that of the bridge deck, and the thickness of the wet joint cast-in-place section is equal to that of the bridge deck of the prefabricated section.
As an ECC material based wet seam structure of portable template bridge preferred scheme, wherein: the continuous complete bottom formwork for pouring the wet joint is formed by embedding, filling and butting a movable formwork and a movable formwork track which is manufactured in advance at the part of the formwork extending from the bottom of the precast beam section to form a continuous complete construction formwork.
As an ECC material based wet seam structure of portable template bridge preferred scheme, wherein: the part of the extension template at the bottom of the precast beam section is a steel structure which is pre-buried or pre-arranged on a bridge precast slab, and a template taking structure is manufactured, namely a structure with a certain gradient can be downwards discharged at one end, so that the movable template can be taken out after a wet joint is poured.
As an ECC material based wet seam structure of portable template bridge preferred scheme, wherein: there is the structure of getting mould in precast beam section bottom extension template part one end, can play the structure of certain slope downwards promptly in one end, is convenient for a wet seam with its effect and pours taking out of accomplishing back movable mould board, and the structure both ends of getting mould are respectively: a hinged end and a movable end; the hinged end is hinged with a movable template track on the extending template part at the bottom of the precast beam section, and the movable end can rotate according to the hinge of the hinged end; the mold taking structure has two working positions: a first working position and a second working position; the first working position refers to a working position when a wet joint is poured, and a structure which is continuous and has the same function as the movable template track is formed by a prefabricated placing position where the movable end of the template taking structure is placed on the abutment; the second working position refers to the working position when the pouring of the wet joint is finished and the movable template is taken out; and after the pouring of the wet joint is finished, the movable template can be taken out after the strength of the wet joint reaches the standard, and the movable end of the template taking structure is taken down from a prefabricated placing position on the abutment, so that a certain gradient can be downwards released for taking out the movable template.
As an ECC material based wet seam structure of portable template bridge preferred scheme, wherein: the movable template is formed by hinging a plurality of sections of small steel bottom templates by using a proper steel hinge, can be placed in a rolling way, and is convenient for taking out one or a part of wet joints after pouring is finished; the bottom of the small steel bottom template is provided with rollers which are divided into three types: the head end small steel bottom template, the middle small steel bottom template and the tail end small steel bottom template; the movable template is arranged on the front end small steel bottom template, the front end small steel bottom template and the tail end small steel bottom template are respectively assembled at the front end and the tail end of the whole movable template during assembly, and the front end small steel bottom template is arranged on one side of the mold taking structure direction so as to take out the movable template; manufacturing a roller at the bottom of each section of small steel bottom template, and manufacturing a movable template track with a corresponding size and a proper size in advance at the corresponding position of the roller on the bottom extension template part of the prefabricated section; and the two are in butt joint and jogged at the corresponding positions of the rails.
As an ECC material based wet seam structure of portable template bridge preferred scheme, wherein: the movable template can be repeatedly used, when the template is taken out, the steel strand or the rope is bound on the annular traction structure on the first section of the movable template, and the steel strand or the rope is pulled out along the movable template track from one side of the template taking structure and is coiled and collected.
Compared with the prior art:
1. directly avoid the suspended operation of the high place, ensure the construction safety and reduce the construction cost.
2. The complex installation and disassembly of the template are avoided, and the construction efficiency is improved.
3. The wet joint structure is more reliable, the performances of force transmission, compression resistance, tensile resistance and the like are improved, and the durability is better.
4. The movable template can be repeatedly used, the construction efficiency is improved, and steel is saved to a great extent.
5. The movable template is formed by hinging a plurality of sections of small steel bottom templates, can be rolled and is convenient for transporting and storing the templates.
6. The movable template can be assembled into the template which is most suitable for the current construction according to the actual needs and local conditions.
The movable template bridge wet joint structure based on the ECC material has high tension and pressure intensity and good durability, can effectively ensure the performance continuity of the ECC concrete material at the wet joint interface, has the advantages of convenient construction, easy maintenance and the like, can solve the difficult problem of the connection quality of the wet joint of the ECC material, and meanwhile, the movable template provided by the movable template greatly facilitates the construction on the one hand, saves a large amount of steel on the other hand, and has strong economical efficiency; the movable template is designed to be formed by hinging a plurality of sections of small steel bottom templates, so that the template transportation space can be saved, the template transportation is facilitated, the template installation is simplified, the construction progress is improved, and the movable template can be conveniently taken out after one wet joint is poured. In addition, the structural design allows for self-assembly of a movable form of a desired length according to a desired wet joint length, which greatly facilitates construction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor. Wherein:
FIG. 1 is an elevation view of a self-contained removable form-bearing bridge wet-seam construction based on ECC materials in accordance with the present invention;
fig. 2 is a plan view of the upper layer of reinforcing mesh of the wet joint structure of the bridge with movable formworks based on ECC material;
fig. 3 is a plan view of the lower layer of reinforcing mesh of the wet joint structure of the bridge with movable formworks based on ECC material;
FIG. 4 is a top plan view of a removable form construction of a bridge wet joint construction with removable forms based on ECC material in accordance with the present invention;
FIG. 5 is a side sectional view of a movable form structure of a bridge wet joint structure with movable forms based on ECC material according to the present invention;
FIG. 6 is a bottom view of a movable form structure of a bridge wet joint structure with movable forms based on ECC material according to the present invention;
FIG. 7 is a schematic diagram of a mold-taking structure of a bridge wet joint structure with a movable template based on an ECC material according to the present invention;
FIG. 8 is a simplified schematic diagram of the calculation of the recommended dimension of the movable template structure with the movable template based on the ECC material according to the present invention;
FIG. 9 is a simplified diagram of the calculation of the recommended dimension of the track structure of the movable template with the movable template based on the ECC material.
In the figure: the prefabricated slab comprises 1 prefabricated slab, 2 prefabricated slab upper-layer longitudinal steel bars, 3 prefabricated slab lower-layer longitudinal steel bars, 4 movable formworks, 5 wet joint upper-layer longitudinal steel bars, 6 wet joint lower-layer transverse steel bars, 7 wet joint upper-layer transverse steel bars, 8 wet joint lower-layer longitudinal steel bars, 9 wet joint cast-in-place sections, 10 prefabricated beam section bottom steel plate extension parts, 11 movable formwork traction structures, 12 movable formwork track structures, 13 formwork taking structures, 14 abutment platforms and 15 abutment pre-manufactured building positions, 16 movable formwork steel hinge structures, 17 head end small steel bottom formwork structures, 18 middle small steel bottom formwork structures, 19 tail end small steel bottom formwork structures and rollers arranged at the bottoms of 20 formworks.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways than those specifically described herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, for convenience of explanation, the sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic drawings are only examples, and should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, 2, 3, 4, 5, 6, 7, 8 and 9, the construction shown includes prefabricated sections, wet joint sections, removable steel bottom forms; the prefabricated section bridge deck is made of ECC materials; the movable steel bottom template is arranged on a track preset at the embedding position of the extension template at the bottom of the bridge floor of the prefabricated section and is butted into a continuous integrated structure to serve as a bottom template of the wet joint section; the wet joint section is supported on the movable steel bottom template and connected with the prefabricated section in a pouring mode, the wet joint section is continuously laid, the thickness of the wet joint section is equal to that of the bridge deck, and an ECC material identical to that of the bridge deck is adopted;
please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9; the precast section comprises a beam bridge deck precast slab 1, precast slab upper-layer longitudinal steel bars 2 and precast slab lower-layer longitudinal steel bars 3 which are longitudinally arranged in the precast slab, and the precast slab 1 is made of the same ECC material as the bridge deck; the movable template 4 is arranged on a track at a pre-made embedding position on a bottom extending template part 10 prefabricated in the beam bridge deck prefabricated plate 1 and is butted to form a bottom template; the wet joint section comprises wet joint upper layer longitudinal steel bars 5, wet joint lower layer transverse steel bars 6, wet joint upper layer transverse steel bars 7, wet joint lower layer longitudinal steel bars 8 and wet joint cast-in-situ section 9; the wet joint upper layer longitudinal steel bars 5 and the wet joint lower layer transverse steel bars 6 are in lap joint and binding with the precast slab upper layer longitudinal steel bars 2 and the precast slab lower layer longitudinal steel bars 3 into a whole, and the wet joint upper layer transverse steel bars 7 are in lap joint and binding with the wet joint upper layer longitudinal steel bars 5 into a whole; the wet joint lower layer transverse steel bars 6 and the wet joint lower layer longitudinal steel bars 8 are overlapped and bound into a whole; the wet joint cast-in-place section 9 is cast in the wet joint section by adopting an ECC material the same as that of the bridge deck, and the thickness of the wet joint cast-in-place section is equal to that of the bridge deck of the prefabricated section.
Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9; the continuous complete bottom formwork for pouring the wet joint is formed by embedding, filling and butting the movable formwork 4 and a prefabricated movable formwork track 12 extending from the bottom of the precast beam section to the formwork part 10 to form a continuous complete construction formwork.
Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9; the precast beam section bottom extension template part 10 is a steel structure pre-buried or pre-arranged on the bridge precast slab 1, and a template taking structure 13 is manufactured, namely a structure with a certain gradient can be discharged downwards at one end, so that the movable template 4 can be taken out after a wet joint is poured.
Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9; there is structure 13 of getting mould 10 one end of precast beam section bottom extension template part, can play the structure of certain slope downwards promptly in one end, is convenient for taking out of a wet seam pouring completion back movable mould board 4 rather than the effect, and structure 13 both ends of getting mould are respectively: a hinged end and a movable end; the hinged end is hinged with a movable template track 12 on the bottom extension template part 10 of the precast beam section, and the movable end can rotate according to the hinge of the hinged end; the mold removal structure 13 has two working positions: a first working position and a second working position; the first working position refers to a working position when a wet joint is poured, and a structure which is continuous and has the same function as the movable template track 12 is formed by a prefabricated placing position 15, wherein the movable end of the template taking structure 13 is placed on the abutment 14; the second working position refers to the working position when the pouring of the wet joint is finished and the movable template is taken out; after pouring of the wet joint is finished, the movable formwork can be taken out after the strength of the wet joint reaches the standard, and the movable end of the formwork taking structure 13 can be taken down from a prefabricated building position 15 on the bridge abutment 14 and can be downwards released to a certain gradient for taking out the movable formwork.
Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9; the movable template 4 is formed by hinging a plurality of sections of small-sized steel bottom templates by using a proper steel hinge 16, can be placed in a rolling way, and is convenient for taking out the movable template 4 after one or a part of wet joints are poured; the bottom of the small steel bottom template is provided with rollers 20 which are divided into three types: a head small steel bottom template 17, a middle small steel bottom template 18 and a tail small steel bottom template 19; the head end small steel bottom template 17 is provided with a traction structure 11, the head end small steel bottom template 17 and the tail end small steel bottom template 19 are respectively assembled at the head end and the tail end of the whole movable template during assembly, and the head end small steel bottom template 17 is arranged at one side of the mold taking structure 13 so as to take out the movable template; manufacturing a roller at the bottom of each section of small steel bottom template, and manufacturing a movable template track 12 with a corresponding size and a proper size in advance at the position corresponding to the roller on the prefabricated section bottom extension template part 10; and the two are in butt joint and jogged at the corresponding positions of the rails.
Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9; the movable template 4 can be reused, when the template is taken out, the steel strand or rope is bound on the annular traction structure 11 on the first section of the movable template, and the steel strand or rope is pulled out from one side of the template taking structure 13 along the movable template track 12 to be rolled and collected.
When the prefabricated slab is used specifically, the movable template 4 is firstly placed on the embedding position of the rail 12 of the beam extension steel plate to be spliced and butted to form a wet joint bottom structure, and then the upper-layer longitudinal steel bars 5 and the lower-layer longitudinal steel bars 6 of the wet joint, the upper-layer longitudinal steel bars 2 of the prefabricated slab and the lower-layer longitudinal steel bars 3 of the prefabricated slab are lapped and bound into a whole; and welding the transverse steel bars 7 on the upper layer of the wet joint and the longitudinal steel bars 8 on the lower layer of the wet joint into a whole. Welding the transverse steel bars 8 at the lower layer of the wet joint and the longitudinal steel bars 8 at the lower layer of the wet joint into a whole to form a steel bar network framework; and finally, pouring an ECC material in the whole wet joint structure to finish construction.
In the embodiment, the precast section comprises a beam bridge deck precast slab 1, precast slab upper-layer longitudinal steel bars 2 and precast slab lower-layer longitudinal steel bars 3 which are longitudinally arranged on an upper layer and a lower layer of the precast slab, the precast slab 1 is made of an ECC material identical to that of a bridge deck, an extension steel plate part is pre-embedded in the beam bridge deck precast slab 1, and a movable template 4 is arranged at a position of an embedding track 12 of the pre-embedded extension part and spliced and butted to form a continuous and complete steel bottom template; and overlapping and binding the upper-layer longitudinal steel bars 5 and the lower-layer longitudinal steel bars 6 of the wet joint with the upper-layer longitudinal steel bars 2 and the lower-layer longitudinal steel bars 3 of the prefabricated slab into a whole. And welding the transverse steel bars 7 on the upper layer of the wet joint and the longitudinal steel bars 8 on the lower layer of the wet joint into a whole. And welding the wet joint lower layer transverse steel bars 8 and the wet joint lower layer longitudinal steel bars 8 into a whole. The wet joint cast-in-place section 9 is cast in the wet joint section by adopting an ECC material the same as that of the bridge deck, and the thickness of the wet joint cast-in-place section is equal to that of the bridge deck of the prefabricated section.
Referring to fig. 1, the gap between two adjacent precast beams is a wet joint. The upper parts of the precast beams on the two sides extend out of the upper-layer longitudinal steel bars 2 and the lower-layer longitudinal steel bars 3 of the precast beams. The two sides of the bottom of the precast beam are extended to form steel plates to make tracks in advance, and the movable template 4 is placed at the embedding position of the track 12 of the steel plates extended to the precast beam to be spliced and butted to form a bottom template, so that a complete wet joint bottom template is formed.
Referring to fig. 2 and 3, the upper longitudinal steel bars 5 and the lower longitudinal steel bars 6 of the wet joint are overlapped and bound with the upper longitudinal steel bars 2 and the lower longitudinal steel bars 3 of the prefabricated slab into a whole; and welding the transverse steel bars 7 on the upper layer of the wet joint and the longitudinal steel bars 8 on the lower layer of the wet joint into a whole. And welding the wet joint lower layer transverse steel bars 8 and the wet joint lower layer longitudinal steel bars 8 into a whole to form the steel bar network framework.
The scale of each structure can be adjusted according to the actual construction conditions, and the calculation recommendation of the design of the relevant dimension is given as follows:
the size of the movable template structure is recommended to calculate:
supposing that the structure longitudinally takes one linear meter for calculation, simplifying the gravity load of the wet joint cast-in-place section 9 into an evenly distributed load with the size of q to act on the movable template 4, simplifying the movable template into a simply supported cantilever structure, and calculating according to the relevant knowledge of material mechanics when the length-height ratio is not less than 4: assuming that the distance from the roller 20 to the edge of the movable template 4 is a; the weight of the wet joint cast-in-place section 9 is G;
the recommended calculation for the wheel spacing b:
when the positive and negative bending moments are equal in value, i.e.
And when the material is saved, the material is saved most.
The size recommendation calculation formula of the movable template track structure can be obtained:
the weight of the wet joint cast-in-place section 9 and the movable template 4 part is F;
the safety coefficient n can be selected according to the actual requirements during construction); the yield limit of the steel used in construction is sigmas；
The calculated stress of each part of structural steel is sigma;
the recommended calculation for the thickness h of the movable template 4 is:
at this time
The equal number is obtained
For precast beam segment bottom steel plate extension 10 steel thickness c:
at this time
(n is a safety coefficient and can be selected according to the actual requirements during construction.) and equal sign can be obtained
The sizes of all the places can be calculated according to the calculation formula, and when the actual construction condition is complex, the calculation formula can be reasonably adopted and designed by combining other calculation methods according to local conditions.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the disclosed embodiments of the present invention can be used in any combination with each other, and the non-exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. An ECC material based movable form bridge wet joint structure, comprising: the construction comprises a prefabricated section, a wet joint section and a movable steel bottom template; the prefabricated section bridge deck is made of ECC materials; the movable steel bottom template is arranged on a track preset at the embedding position of the extension template at the bottom of the bridge floor of the prefabricated section and is butted into a continuous integrated structure to serve as a bottom template of the wet joint section; the wet joint section is supported on the movable steel bottom template and connected with the prefabricated section in a pouring mode, the wet joint section is continuously laid, the wet joint section and the bridge deck are equal in thickness, and ECC materials identical to those of the bridge deck are adopted.
2. The structure of the wet joint of the movable formwork bridge based on the ECC material is characterized in that the precast segment comprises a bridge deck precast slab (1) and precast slab upper-layer longitudinal steel bars (2) and precast slab lower-layer longitudinal steel bars (3) which are longitudinally arranged inside the precast slab, and the precast slab (1) is made of the same ECC material as the bridge deck; the movable template (4) is arranged on a track at a pre-made embedding position on a bottom extending template part (10) prefabricated in the beam bridge deck prefabricated plate (1) and is butted to form a bottom template; the wet joint section comprises wet joint upper-layer longitudinal steel bars (5), wet joint lower-layer transverse steel bars (6), wet joint upper-layer transverse steel bars (7), wet joint lower-layer longitudinal steel bars (8) and a wet joint cast-in-place section (9); the wet joint upper layer longitudinal steel bars (5) and the wet joint lower layer transverse steel bars (6) are in lap joint and bound with the precast slab upper layer longitudinal steel bars (2) and the precast slab lower layer longitudinal steel bars (3) into a whole, and the wet joint upper layer transverse steel bars (7) are in lap joint and bound with the wet joint upper layer longitudinal steel bars (5) into a whole; the wet joint lower layer transverse steel bars (6) and the wet joint lower layer longitudinal steel bars (8) are overlapped and bound into a whole; the wet joint cast-in-place section (9) is poured in the wet joint section by adopting an ECC material which is the same as that of the bridge deck, and the thickness of the wet joint cast-in-place section is equal to that of the bridge deck of the prefabricated section.
3. The ECC-material-based movable formwork bridge wet joint structure is characterized in that a continuous complete bottom formwork for pouring the wet joint is formed by embedding and butting a movable formwork (4) and a prefabricated movable formwork track (12) of a formwork section (10) extending from the bottom of a precast beam section to form a continuous complete construction formwork.
4. The wet joint structure of movable formwork bridges based on ECC material as claimed in claim 1, wherein the bottom extension formwork part (10) of the precast beam segment is a steel structure pre-buried or pre-installed on the precast slab (1) of the bridge, and the formwork removal structure (13) is made, i.e. a structure with a certain slope can be released downwards at one end, so that the movable formwork (4) can be removed after a wet joint is poured.
5. The wet joint structure of a movable formwork bridge based on ECC material as claimed in claim 1, wherein the one end of the extension formwork part (10) at the bottom of the precast beam segment has a mould-taking structure (13), i.e. a structure with a certain slope can be released downwards at one end, and the function is to facilitate the taking out of the movable formwork (4) after the pouring of a wet joint is completed, and the two ends of the mould-taking structure (13) are respectively: a hinged end and a movable end; the hinged end is hinged with a movable template track (12) on the extending template part (10) at the bottom of the precast beam section, and the movable end can rotate according to the hinge of the hinged end; the mould-taking structure (13) has two working positions: a first working position and a second working position; the first working position refers to a working position when a wet joint is poured, and a structure which is continuous and has the same function as the movable template track (12) is formed by a prefabricated placing position (15) where the movable end of the template taking structure (13) is placed on the abutment (14); the second working position refers to the working position when the pouring of the wet joint is finished and the movable template is taken out; and after the pouring of the wet joint is finished, the movable template can be taken out after the strength of the wet joint reaches the standard, and the movable end of the mold taking structure (13) can be taken down from a prefabricated building position (15) on the abutment (14) to be discharged downwards with a certain gradient for taking out the movable template.
6. An ECC material based movable formwork bridge wet joint structure according to claim 1, wherein the movable formwork (4) is formed by hinging a plurality of small steel bottom formworks by using a suitable steel hinge (16), can be placed in a rolling way, and is convenient for taking out the movable formwork (4) after one or a part of wet joints are poured; the bottom of the small steel bottom template is provided with rollers (20) which are divided into three types: a head small steel bottom template (17), a middle small steel bottom template (18) and a tail small steel bottom template (19); the small-sized steel bottom template (17) at the head end is provided with a traction structure (11), the small-sized steel bottom template (17) at the head end and the small-sized steel bottom template (19) at the tail end are respectively assembled at the head end and the tail end of the whole movable template during assembly, and the small-sized steel bottom template (17) at the head end is arranged at one side of the mold taking structure (13) in the direction so as to take out the movable template; manufacturing a roller at the bottom of each section of small steel bottom template, and manufacturing a movable template track (12) with a corresponding size and a proper size in advance at the position corresponding to the roller on the prefabricated section bottom extension template part (10); and the two are in butt joint and jogged at the corresponding positions of the rails.
7. An ECC material based movable formwork bridge wet joint structure according to claim 1, wherein the movable formwork (4) is reusable, and when the formwork is taken out, steel strands or ropes are bound on the annular traction structure (11) on the first section of the movable formwork, and the movable formwork is pulled out from one side of the formwork taking structure (13) along the movable formwork track (12) and collected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120402429.9U CN214882997U (en) | 2021-02-23 | 2021-02-23 | Movable template bridge wet joint structure based on ECC material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120402429.9U CN214882997U (en) | 2021-02-23 | 2021-02-23 | Movable template bridge wet joint structure based on ECC material |
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| Publication Number | Publication Date |
|---|---|
| CN214882997U true CN214882997U (en) | 2021-11-26 |
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|---|---|---|---|
| CN202120402429.9U Expired - Fee Related CN214882997U (en) | 2021-02-23 | 2021-02-23 | Movable template bridge wet joint structure based on ECC material |
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| Country | Link |
|---|---|
| CN (1) | CN214882997U (en) |
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2021
- 2021-02-23 CN CN202120402429.9U patent/CN214882997U/en not_active Expired - Fee Related
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