CN114960441A - Corrosion-resistant concrete guardrail permanent formwork and construction method - Google Patents
Corrosion-resistant concrete guardrail permanent formwork and construction method Download PDFInfo
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- CN114960441A CN114960441A CN202210624667.3A CN202210624667A CN114960441A CN 114960441 A CN114960441 A CN 114960441A CN 202210624667 A CN202210624667 A CN 202210624667A CN 114960441 A CN114960441 A CN 114960441A
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
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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
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Abstract
The invention belongs to the technical field of bridges, and relates to a permanent template of a corrosion-resistant concrete guardrail and a construction method, wherein a first template, a second template, a third template and a fourth template are arranged on a guardrail reinforcement cage through positioning bolt assemblies, the second template is lapped over the first template and is arranged on the collision-facing surface of the guardrail, the third template is lapped over the fourth template and is arranged on the back surface of the guardrail, and the templates can be conveniently adjusted for fine adjustment and positioning in an inner and outer bolt adjusting mode, so that the thickness of a concrete protective layer poured on the inner and outer surfaces of the guardrail is strictly ensured; not only can be used for the guardrail construction of pouring, through adopting different template types, can also be convenient promote to the concrete member of other durability environment and pour the construction scene.
Description
Technical Field
The invention belongs to the technical field of bridges, and relates to a permanent template of a corrosion-resistant concrete guardrail and a construction method.
Background
The bridge anti-collision guardrail plays an important role in protecting driving safety as an important component of a bridge deck system, most of bridge anti-collision guardrails adopt cast-in-place concrete wall type anti-collision guardrails at present, and the line type and the angle of the face, which is faced to collision, of the concrete guardrail need to strictly meet the specified requirements. At present, the construction of guardrails generally adopts a mode of assembling and assembling steel templates and pouring in situ, a plurality of targeted auxiliary construction tools are invented, the construction methods are mature, but the construction methods also have certain problems: (1) in general, in a construction site, a steel template is usually used in a turnover mode in order to save cost, and in order to ensure the quality of a molding surface and improve the turnover use times, a thicker steel plate is usually used for a template surface, and the thickness of the steel plate is generally 5 mm; in order to ensure the integral rigidity, a large number of stiffening ribs are required to be additionally arranged; therefore, the single steel template is heavy, the common manual carrying is not possible, small machine tools and equipment are needed, the construction difficulty is increased, the external mold of the guardrail is suspended, and the large safety risk is caused on the site when the template is too high in quality; (2) the steel formwork cast-in-place usually adopts a counter-pulling screw rod to limit the distance between an inner formwork and an outer formwork to control the size of a forming surface, so that the phenomenon of uneven thickness of concrete protective layers on the inner side and the outer side possibly exists in the casting process, a protective layer cushion block needs to be arranged on the surface of a steel reinforcement cage to avoid the situation, the construction process is increased, the situation that cushion block marks appear on the forming surface possibly exists, and the attractiveness is influenced; (3) the common reinforced concrete guardrail is generally low in strength grade and weak in anti-permeability, and in northern deicing salt areas, coastal areas often have the defects that chloride ions permeate and adhere to the depth of the guardrail steel bars to cause corrosion and spalling of concrete. Therefore, a novel bridge guardrail template and a construction method thereof are urgently needed to be designed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a permanent template of a corrosion-resistant concrete guardrail and a construction method.
In order to achieve the purpose, the permanent formwork for the corrosion-resistant concrete guardrail comprises a first formwork, a second formwork, a third formwork and a fourth formwork; the first template, the second template, third template and fourth template all are equipped with two sets of positioning bolt subassemblies, the first template, the second template, third template and fourth template pass through the positioning bolt unit mount on guardrail steel reinforcement cage, the second template overlap joint is in first template top and install and meet the face of hitting at the guardrail, the third template overlap joint is in fourth template top and install at the guardrail back, through the lapped mode, can assemble the template of modular design fast, the packaging efficiency is improved, the positioning bolt subassembly can fix four templates and guardrail steel reinforcement cage fast, can realize finely tuning the relative position relation between template and the steel reinforcement cage through adjusting the positioning bolt subassembly.
Preferably, the first template, the second template, the third template and the fourth template are all made of ultra-high performance concrete materials through compression molding in a factory.
Preferably, the lap joint mode between first template and second template and third template and the fourth template is the L type, and the overlap joint face is smeared the structure and is glued the closed gap, and is sealed the connection structure between the template through the structure glue, prevents the infiltration.
Preferably, first template, second template, third template and fourth template surface are the plain noodles, and the internal surface all is provided with latticed impressed watermark, improves the frictional force between template and the guardrail muddy earth through the impressed watermark that sets up for it is more firm to adhere to.
Preferably, the positioning bolt assembly comprises an inner bolt, an inner gasket, an outer bolt, an outer gasket and a screw, the screw penetrates through the template, the inner bolt is installed at one end of the screw and is positioned on the inner surface of the template, and the inner gasket is padded between the inner bolt and the template; the outer bolt is installed at the other end of the screw rod and is located on the outer surface of the template, an outer gasket is padded between the outer bolt and the template, and the position relation between the template and the guardrail steel reinforcement cage is adjusted by rotating the inner bolt and the outer bolt.
Preferably, the concrete is filled in the inner side of the guardrail steel reinforcement cage, and the guardrail steel reinforcement cage and the concrete form a guardrail main body.
Preferably, an inclined strut assembly is arranged on the outer side of the second template, an upper contact component of the inclined strut assembly is fixed with the template through a positioning bolt assembly, the upper contact component is connected with an inclined strut, the tail end of the inclined strut is hinged with a bridge deck contact component, and the inclined strut is fixedly connected to a bridge deck through the bridge deck contact component.
The compression strength, the breaking strength and the elastic modulus of the ultra-high performance concrete adopted by the template can respectively reach more than 100MPa, 12MPa and 50GPa, and the chloride ion permeability coefficients are 1/50 and 1/30 of common concrete and high performance concrete respectively, so that the template is very suitable for external protection of the easily damaged area of the crash barrier.
The construction process of the permanent template of the corrosion-resistant concrete guardrail comprises the following steps:
(1) a first template, a second template, a third template and a fourth template are arranged on the outer side of the guardrail steel reinforcement cage, and a grouting opening is reserved between the second template and the third template;
(2) adjusting a positioning bolt assembly between each template and the guardrail steel reinforcement cage, wherein the positioning between the templates and the guardrail steel reinforcement cage is adjusted through an inner bolt, the clear distance from the surface of the steel reinforcement to the back of the template can be ensured to meet the requirement, the outer bolt plays a role in offsetting the horizontal force of flowing concrete in the template during pouring, the inner bolt and the outer bolt are finely adjusted, and the outer surface of the template can be ensured to meet the molding requirement;
(3) installing an inclined strut assembly, fixing one end of the inclined strut to a bridge deck anchor bar, fixing the other end of the inclined strut to the top of the guardrail steel reinforcement cage through a positioning bolt assembly on a second template, and realizing the integral positioning of the guardrail steel reinforcement cage by adjusting an inner bolt and an outer bolt of the positioning bolt assembly;
(4) and pouring concrete into the guardrail reinforcement cage through the grouting opening, dismantling and recycling the inclined strut assembly after the concrete pouring is finished, and screwing the outer bolt to fix the second template.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with the weight of 200kg of a conventional steel template, the maximum weight of a single template is only 15.73kg, no auxiliary construction machine is needed in site construction, and the construction convenience and safety are greatly improved;
(2) the guardrail is not required to be dismantled, the ultra-high performance material is used for replacing part of the guardrail concrete material, and the consumption of the concrete is not increased; the turnover material is only the diagonal brace, the component is not easy to damage, and can be turned over infinitely theoretically, so that a large amount of steel is saved; the economic benefit of guardrail construction is high.
(3) The ultra-thin template of the ultra-high performance concrete is used as an outer protective surface, the chlorine ion diffusion resistance is improved by 50 times compared with that of common concrete, and mechanical indexes such as compressive strength and the like are improved by multiple times, so that stubborn diseases of easy corrosion and damage of the crash-facing surface of the guardrail can be effectively solved;
(4) the stress is reasonable, the pouring force is uniformly shared to the steel reinforcement framework in a multi-point sharing mode, and the conditions of mold running and mold explosion are avoided;
(5) the template can be subjected to industrial standard processing, the appearance quality and the stress performance are well guaranteed, and the latticed protruding lines are arranged on the inner side of the template, so that the section occlusion capacity can be remarkably improved;
(6) the template can be conveniently adjusted to carry out fine adjustment and positioning in an inner and outer bolt adjusting mode, and the thickness of the concrete protective layer poured on the inner and outer surfaces of the guardrail is strictly ensured; (ii) a Not only can be used for the guardrail construction of pouring, through adopting different template patterns, can also be convenient promote to the concrete member of other durability environment in the construction scene of pouring.
Drawings
FIG. 1 is an overall schematic view of a pouring construction assembly of the guardrail of the invention;
FIG. 2 is a schematic illustration of the template assembly of the present invention;
FIG. 3 is a dimensional configuration diagram of a first template according to the present invention;
FIG. 4 is a dimensional configuration diagram of a second template according to the present invention;
FIG. 5 is a dimensional configuration diagram of a third template according to the present invention;
fig. 6 is a dimensional configuration diagram of a fourth template according to the present invention;
FIG. 7 is a view showing the construction of the lap joint of the form of the present invention;
FIG. 8 is a construction view of the set bolt assembly of the present invention;
FIG. 9 is a construction view of the sprag assembly of the present invention;
in the figure, 1, a first template; 2. a second template; 3. a third template; 4. a fourth template; 5. a diagonal bracing assembly 6, a positioning bolt assembly; 7. a guardrail reinforcement cage; 8. an inner bolt; 9. an inner gasket; 10. an outer bolt 1011 and an outer gasket; 12. a screw; 13. concrete; 14. an upper contact member; 15. a diagonal brace; 16. a deck contact member.
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):
the permanent formwork for the corrosion-resistant concrete guardrail comprises a first formwork 1, a second formwork 2, a third formwork 3 and a fourth formwork 4; first template 1, the second template 2, third template 3 and fourth template 4 all are equipped with two sets of positioning bolt subassembly 6, first template 1, the second template 2, third template 3 and fourth template 4 pass through positioning bolt subassembly 6 and install on guardrail steel reinforcement cage 7, 2 laps of second template are just installed in 1 top of first template and meet the face of hitting at the guardrail, 3 laps of third template are just installed in 4 tops of fourth template at the guardrail back, through the lapped mode, can assemble the template of modular design fast, the efficiency of assembly is improved, positioning bolt subassembly 6 can fix four templates and guardrail steel reinforcement cage 7 fast, can realize finely tuning the relative position relation between template and the steel reinforcement cage through adjusting positioning bolt subassembly 6.
Specifically, the first formwork 1, the second formwork 2, the third formwork 3 and the fourth formwork 4 are all made of ultra-high performance concrete materials and are formed by pressing in a factory, the size distribution of the ultra-high performance concrete materials is shown in fig. 3-6, and the specific parameters are shown in table 1:
table 1: template parameters
The template is used as an outer protection plate of the guardrail, the ultra-high performance concrete material for preparing the template improves the chlorine ion diffusion resistance by 50 times compared with common concrete, and mechanical indexes such as compressive strength and the like are improved by multiple times, so that the intractable diseases that the collision surface of the guardrail is easy to rust and damage can be effectively solved.
Specifically, the overlap joint mode between first template 1 and second template 2 and third template 3 and the fourth template 4 is the L type, and the overlap joint face is smeared the structure and is glued the closure gap, and is glued the connection structure between the template through the structure and sealed, prevents the infiltration.
Specifically, first template 1, second template 2, third template 3 and fourth template 4 surface are the plain noodles, and the internal surface all is provided with latticed impressed watermark, improves the frictional force between template and the guardrail muddy earth through the impressed watermark that sets up for it is more firm to adhere to.
Specifically, the positioning bolt assembly comprises an inner bolt 8, an inner gasket 9, an outer bolt 10, an outer gasket 11 and a screw 12, wherein the screw 12 penetrates through the template, the inner bolt 8 is installed at one end of the screw 12 and is positioned on the inner surface of the template, and the inner gasket 9 is padded between the inner bolt 8 and the template; an outer bolt 10 is installed at the other end of the screw 12 and is positioned on the outer surface of the formwork, an outer gasket 11 is padded between the outer bolt 10 and the formwork, and the position relation between the formwork and the guardrail steel reinforcement cage 7 is adjusted by rotating the inner bolt 8 and the outer bolt 10.
Specifically, concrete 13 is filled to the inboard of guardrail steel reinforcement cage 7, and guardrail steel reinforcement cage 7 and concrete 13 constitute the guardrail main part.
Specifically, the inclined strut assembly 5 is arranged on the outer side of the second template 2, an upper contact component 14 of the inclined strut assembly 5 is fixed with the template through a positioning bolt assembly 6, the upper contact component 14 is hinged with an inclined strut 15, the tail end of the inclined strut 15 is hinged with a bridge deck contact component 16, and the inclined strut 15 is fixedly connected to a bridge deck through the bridge deck contact component 16.
The construction process of the permanent template of the corrosion-resistant concrete guardrail comprises the following steps:
(1) a first template 1, a second template 2, a third template 3 and a fourth template 4 are arranged on the outer side of the guardrail steel reinforcement cage 7, and a grouting opening is reserved between the second template 2 and the third template 3;
(2) adjusting a positioning bolt assembly between each template and the guardrail steel reinforcement cage 7, wherein the positioning between the templates and the guardrail steel reinforcement cage 7 is adjusted through an inner bolt 8, so that the clear distance from the surface of the steel reinforcement to the back of the template can meet the requirement, and an outer bolt 10 plays a role in offsetting the horizontal force of flowing concrete in the templates during pouring, finely adjusts the inner bolt and the outer bolt, so that the outer surface of the template can meet the molding requirement;
(3) installing an inclined strut assembly 5, fixing one end of an inclined strut 15 to a bridge deck anchor bar, fixing the other end of the inclined strut to the top of a guardrail reinforcement cage 7 through a positioning bolt assembly on a second template 2, and realizing the integral positioning of the guardrail reinforcement cage 7 by adjusting an inner bolt and an outer bolt of the positioning bolt assembly;
(4) and (3) injecting concrete 13 into the guardrail reinforcement cage 7 through a grouting opening, dismantling the inclined strut assembly for recycling after the concrete pouring is finished, and screwing the outer bolt 10 to fix the second template 2.
In this example, the durability of the formwork material UHPC200 was compared with that of high-performance concrete and ordinary concrete, and the results are shown in table 2.
Table 2:
| performance of | Ordinary concrete | High-performance concrete | UHPC200 |
| Diffusion of chloride ions (10) -12 m 2 /s) | 1.1 | 0.6 | 0.02 |
| Carbonization depth (mm) | 10 | 2 | 0 |
| Amount of freeze-thaw exfoliation (g/m) 2 ) | >1000 | 900 | 7 |
| Corrosion coefficient | 4.0 | 2.8 | 1.3 |
Components not described in detail herein are all common in the art.
While the invention has been described in detail with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A permanent formwork for a corrosion-resistant concrete guardrail is characterized by comprising a first formwork, a second formwork, a third formwork and a fourth formwork; first template, second template, third template and fourth template all are equipped with two sets of positioning bolt subassemblies, and first template, second template, third template and fourth template pass through the positioning bolt subassembly and install on guardrail steel reinforcement cage, and the second template overlap joint just installs in the guardrail and meets the face of colliding in first template top, and the third template overlap joint just installs at the guardrail back in fourth template top.
2. The permanent formwork of corrosion-resistant concrete barrier of claim 1, wherein the first formwork, the second formwork, the third formwork and the fourth formwork are all press-formed by a factory using ultra-high performance concrete material.
3. The permanent formwork for a corrosion-resistant concrete guardrail of claim 1, wherein the lapping mode between the first formwork and the second formwork and between the third formwork and the fourth formwork is L-shaped, and the lapping surface is coated with structural adhesive to close the gap.
4. The permanent form of a corrosion resistant concrete barrier of claim 3, wherein the first, second, third and fourth forms are smooth on their outer surfaces and have lattice embossments on their inner surfaces.
5. The permanent formwork for a corrosion-resistant concrete guardrail of claim 4, wherein the positioning bolt assembly comprises an inner bolt, an inner gasket, an outer bolt, an outer gasket and a screw rod, the screw rod penetrates through the formwork, the inner bolt is installed at one end of the screw rod and is positioned on the inner surface of the formwork, and the inner gasket is padded between the inner bolt and the formwork; the outer bolt is installed at the other end of the screw rod and is located on the outer surface of the template, an outer gasket is padded between the outer bolt and the template, and the position relation between the template and the guardrail steel reinforcement cage is adjusted by rotating the inner bolt and the outer bolt.
6. The permanent formwork for the corrosion-resistant concrete guardrail of claim 5, wherein a diagonal brace assembly is arranged on the outer side of the second formwork, an upper contact member of the diagonal brace assembly is fixed with the formwork through a positioning bolt assembly, a diagonal brace is connected with the upper contact member, the tail end of the diagonal brace is hinged with a bridge deck contact member, and the diagonal brace is fixedly connected on the bridge deck through the bridge deck contact member.
7. The construction method of the corrosion-resistant concrete guardrail permanent formwork as claimed in claim 6, characterized in that the concrete construction process is as follows:
(1) a first template, a second template, a third template and a fourth template are arranged on the outer side of the guardrail steel reinforcement cage, and a grouting opening is reserved between the second template and the third template;
(2) adjusting a positioning bolt assembly between each template and the guardrail steel reinforcement cage, wherein the positioning between the templates and the guardrail steel reinforcement cage is adjusted through an inner bolt, the clear distance from the surface of the steel reinforcement to the back of the template can be ensured to meet the requirement, the outer bolt plays a role in offsetting the horizontal force of flowing concrete in the template during pouring, the inner bolt and the outer bolt are finely adjusted, and the outer surface of the template can be ensured to meet the molding requirement;
(3) installing an inclined strut assembly, fixing one end of the inclined strut to a bridge deck anchor bar, fixing the other end of the inclined strut to the top of the guardrail steel reinforcement cage through a positioning bolt assembly on a second template, and realizing the integral positioning of the guardrail steel reinforcement cage by adjusting an inner bolt and an outer bolt of the positioning bolt assembly;
(4) and pouring concrete into the guardrail reinforcement cage through the grouting opening, dismantling the inclined strut assembly for recycling after the concrete pouring is finished, screwing the outer bolt to fix the second template, and finishing the construction of the permanent template of the guardrail.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210624667.3A CN114960441A (en) | 2022-06-02 | 2022-06-02 | Corrosion-resistant concrete guardrail permanent formwork and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210624667.3A CN114960441A (en) | 2022-06-02 | 2022-06-02 | Corrosion-resistant concrete guardrail permanent formwork and construction method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1136234A (en) * | 1997-07-22 | 1999-02-09 | Kawada Kensetsu Kk | Construction method for concrete structure with precast buried form |
| CN109853367A (en) * | 2019-03-21 | 2019-06-07 | 华南理工大学 | A kind of ultra-high performance concrete composite permanent template and application |
| CN113152339A (en) * | 2021-04-28 | 2021-07-23 | 北京华路安交通科技有限公司 | Concrete guardrail attached type fixed die pouring construction method |
| CN113957787A (en) * | 2021-12-06 | 2022-01-21 | 中交公路长大桥建设国家工程研究中心有限公司 | Semi-assembly type concrete guardrail and mounting method thereof |
| CN215671022U (en) * | 2021-08-13 | 2022-01-28 | 中建八局科技建设有限公司 | Pre-embedded type mounting device for aluminum alloy template |
| CN216108090U (en) * | 2021-07-27 | 2022-03-22 | 中建安装集团南京建设有限公司 | Be used for reinforced (rfd) appurtenance of bridge concrete anticollision barrier inner formword |
-
2022
- 2022-06-02 CN CN202210624667.3A patent/CN114960441A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1136234A (en) * | 1997-07-22 | 1999-02-09 | Kawada Kensetsu Kk | Construction method for concrete structure with precast buried form |
| CN109853367A (en) * | 2019-03-21 | 2019-06-07 | 华南理工大学 | A kind of ultra-high performance concrete composite permanent template and application |
| CN113152339A (en) * | 2021-04-28 | 2021-07-23 | 北京华路安交通科技有限公司 | Concrete guardrail attached type fixed die pouring construction method |
| CN216108090U (en) * | 2021-07-27 | 2022-03-22 | 中建安装集团南京建设有限公司 | Be used for reinforced (rfd) appurtenance of bridge concrete anticollision barrier inner formword |
| CN215671022U (en) * | 2021-08-13 | 2022-01-28 | 中建八局科技建设有限公司 | Pre-embedded type mounting device for aluminum alloy template |
| CN113957787A (en) * | 2021-12-06 | 2022-01-21 | 中交公路长大桥建设国家工程研究中心有限公司 | Semi-assembly type concrete guardrail and mounting method thereof |
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