CN114657897A - Heat-insulating construction method for suspension cast beam in alpine region - Google Patents
Heat-insulating construction method for suspension cast beam in alpine region Download PDFInfo
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- CN114657897A CN114657897A CN202210153810.5A CN202210153810A CN114657897A CN 114657897 A CN114657897 A CN 114657897A CN 202210153810 A CN202210153810 A CN 202210153810A CN 114657897 A CN114657897 A CN 114657897A
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Classifications
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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
- E01D21/10—Cantilevered erection
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/025—Adiabatic curing or hardening
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0263—Hardening promoted by a rise in temperature
-
- 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
- E04G9/00—Forming or shuttering elements for general use
- E04G9/10—Forming or shuttering elements for general use with additional peculiarities such as surface shaping, insulating or heating, permeability to water or air
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Building Environments (AREA)
Abstract
The invention relates to the technical field of building structure engineering, in particular to a heat-insulating construction method for a cantilever beam in a severe cold area. The purpose of effectively preserving heat of the cantilever beam during cantilever beam construction in alpine or low-temperature areas is achieved, and the technical defect that the heat preservation effect of a heat preservation body is poor when the cantilever beam heat preservation construction is carried out in the same environment in the prior art is overcome.
Description
Technical Field
The invention relates to the technical field of building structure engineering, in particular to a heat-insulation construction method for a suspended cast beam in a severe cold area.
Background
With the rapid development of economy and increasingly busy traffic and transportation services, the cross construction of highway bridges and existing lines is continuously increased, the structural form of the bridges is also continuously optimized and updated, and the prestressed continuous beam is widely adopted due to the characteristics of low manufacturing cost, large span, wide application range and the like. Due to the restrictions of geographical environment and climate conditions, the construction of bridges in winter is more and more common in northern areas.
In the prior art, when the suspended cast beam heat preservation construction is carried out in a severe cold or low temperature area, the defects of poor heat preservation effect of a heat preservation body and the like are often faced.
Disclosure of Invention
The invention mainly aims to provide a heat preservation construction method for a suspension cast beam in a severe cold area, and aims to overcome the technical defect that a heat preservation body is poor in heat preservation effect when suspension cast beam construction is carried out in severe cold or low temperature areas in the prior art.
In order to achieve the purpose, the invention provides a heat preservation construction method for a suspended cast beam in a severe cold area, which comprises the following steps:
arranging a first heat-preservation layer on one side of a template to be used by adopting a first heat-preservation material;
arranging at least one heat insulation component fixedly connected with the template on the first heat insulation layer;
completely coating the heat insulation assembly by using a second heat insulation material to obtain a second heat insulation layer, and forming a heat insulation template;
enclosing at least four heat-insulating templates at the periphery of a to-be-cast cantilever beam to form a cantilever beam casting space;
preheating the heat-insulating template through the heat-insulating assembly so as to enable the casting space of the cantilever beam to reach a target temperature;
and carrying out construction and maintenance on the cantilever beam at the target temperature to obtain a finished prestressed cantilever beam.
Optionally, the step of arranging the first heat-insulating layer on one side of the template to be used by using the first heat-insulating material includes:
mixing a polyurethane foaming agent and a flame retardant according to a target ratio to obtain the heat-insulating material;
processing the surface of the template to obtain a target surface;
and spraying the heat-insulating material on the target surface.
Optionally, the target ratio is a mass ratio, and the ratio of the target ratio is greater than 0 and not greater than 2.
Optionally, the step of providing at least one heat-insulating assembly fixedly connected to the formwork on the first heat-insulating layer includes:
arranging at least one hole communicated with the target surface on the first heat-preservation layer to form a fixing position;
correspondingly placing at least one fixing piece in the fixing position, and fixedly connecting the fixing piece with the target surface to form a fixing support;
a support frame is fixedly placed on the fixed support to form a support framework;
and fixedly arranging a temperature adjusting piece on the supporting framework to obtain the heat insulation assembly.
Optionally, the ratio of the thickness of the second insulating layer to the thickness of the first insulating layer is not less than 1/2.
Optionally, the heat insulation module is used for preheating the heat insulation template so that the casting space of the cantilever beam reaches a target temperature, and the method includes the following steps:
the heat-insulating layer is preheated through the temperature adjusting piece, so that the temperature in the cantilever beam pouring space rises, and the temperature in the cantilever beam pouring space is detected and adjusted through the temperature adjusting piece, so that the temperature adjusting piece is controlled to stop preheating when the temperature in the cantilever beam pouring space reaches the target temperature.
Optionally, the construction and maintenance of the cantilever beam at the target temperature to obtain a finished prestressed cantilever beam product includes the following steps:
preparing a mixture for casting the cantilever beam, and modulating the temperature of the mixture to enable the temperature of the mixture to reach a target casting temperature;
pouring the mixture kept at the target mixing temperature into the pouring space of the cantilever beam at the target temperature to form a cantilever beam structure to be maintained;
carrying out heat preservation maintenance on the cantilever beam structure to be maintained at the target temperature to obtain a target cantilever beam;
and removing the formwork, and performing tensioning and grouting construction on the target suspension casting beam to obtain a finished prestressed suspension casting beam.
Optionally, the mixture comprises aggregate, cement and water for mixing, wherein the strength grade of the cement is not lower than 42.5, and the water-cement ratio is more than 0 and not more than 0.5.
Optionally, the temperature of the blending water is greater than 5 ℃ and not greater than 60 ℃.
Optionally, the mixing time of the mixture is 1.5 times of the natural normal-temperature mixing time;
and/or the presence of a gas in the gas,
the target pouring temperature is not lower than 10 ℃.
Has the advantages that:
according to the technical scheme, a first heat preservation layer is arranged on one side of a template to be used by adopting a first heat preservation material, at least one heat preservation assembly fixed with the template is arranged on the first heat preservation layer, then a second heat preservation layer is arranged on the first heat preservation layer by adopting the heat preservation material same as the first heat preservation layer to obtain a heat preservation template structure, at least four heat preservation template structures are enclosed at the periphery of a cantilever beam to be poured to form a cantilever beam pouring space, the cantilever beam pouring space is preheated at the same time, the cantilever beam pouring space reaches a target temperature, and cantilever beam pouring construction and maintenance are carried out at the target temperature to obtain a finished prestressed cantilever beam. The invention realizes the purpose of effectively preserving the heat of the suspended cast beam when the suspended cast beam is constructed in the alpine or low-temperature area, and solves the technical defect of poor heat preservation effect of the heat preservation body when the suspended cast beam is constructed in the same environment in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a suspended cast beam heat preservation construction method in a severe cold area according to the invention;
FIG. 2 is a schematic flow chart of another embodiment of the heat preservation construction method for the suspended cast beam in the alpine region;
FIG. 3 is a schematic flow chart of a heat preservation construction method for a suspended cast beam in a severe cold area according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of another embodiment of the heat preservation construction method for the suspended cast beam in the alpine region.
The implementation, functional features and advantages of the objects of the present invention will be further described with reference to the accompanying drawings.
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.
It should be noted that all directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any combination, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope required by the present invention.
With the rapid development of economy and the increasingly busy traffic and transportation business, the cross construction of highway bridges and existing lines is continuously increased, the structural form of the bridges is also continuously optimized and updated, and the prestressed continuous beam is widely adopted due to the characteristics of low manufacturing cost, large span, wide application range and the like. Due to the restrictions of geographical environment and climate conditions, the construction of bridges in winter is more and more common in northern areas.
In the prior art, when the prestressed suspended cast beam construction is carried out in a severe cold or low temperature environment, the technical problem on the scene is that when the cast-in-place suspended cast beam is subjected to heat insulation construction and maintenance in the severe cold or low temperature environment, the heat insulation effect of a heat insulation body for insulating the suspended cast beam is poor, and the quality of a finished product of the insulated suspended cast beam structure is influenced.
Based on the construction method, a first heat preservation layer is arranged on one side of a template to be used by adopting a first heat preservation material, at least one heat preservation assembly fixed with the template is arranged on the first heat preservation layer, then a second heat preservation layer is arranged on the first heat preservation layer by adopting the heat preservation material same as the first heat preservation layer to obtain a heat preservation template structure, at least four heat preservation template structures are surrounded on the periphery of the cantilever beam to be cast to form a cantilever beam casting space, the cantilever beam casting space is preheated at the same time, the cantilever beam casting space reaches a target temperature, and the cantilever beam casting construction and maintenance are carried out at the target temperature to obtain a prestressed cantilever beam finished product. The invention realizes the purpose of effectively preserving the heat of the suspension cast beam when the suspension cast beam construction is carried out in the alpine or low-temperature area, and solves the technical defect of poor heat preservation effect of the heat preservation body when the suspension cast beam heat preservation construction is carried out in the same environment in the prior art.
The inventive concept of the present invention will be further elucidated below in connection with some specific embodiments.
In an embodiment of the present invention, as shown in fig. 1, fig. 1 is a schematic flow chart of an embodiment of a suspended cast beam thermal insulation construction method in an alpine region according to the present invention; the heat preservation construction method for the suspended cast beam in the alpine region comprises the following steps:
s100, arranging a first heat preservation layer on one side of a template to be used by adopting a first heat preservation material;
in this embodiment, before setting up first heat preservation, need to handle the surface that the template set up first heat preservation for insulation material can have better laminating degree with the surface of template.
It should be particularly clear and explained that, in the present embodiment, the surface of the formwork provided with the primary insulation layer includes, but is not limited to, the following types: the foreign matters such as concrete block, dust on the surface of the template are cleaned, and the surface of the template is provided with a structure such as a bulge or an agnail so as to increase the contact area between the surface of the template and the first heat preservation layer. Of course, in this embodiment, the side of the formwork where the first heat preservation layer is disposed should be the back side of the formwork, or the side of the formwork that is not in contact with the outer surface of the cantilever beam.
It can be further explained that, in the present embodiment, the formwork refers to a model for forming the newly poured concrete, and the formwork system is composed of a formwork, a supporting member and a fastening member, which is required to ensure the shape and size accuracy of the structure and the member; sufficient strength, rigidity and stability; the assembly and disassembly are convenient and the device can be used repeatedly; the joint is tight and does not leak slurry.
Common templates include wooden templates, shaped combination templates, large tool type large templates, climbing templates, sliding templates, tunnel templates, platform templates (flying templates and table templates), permanent templates, and the like. It is understood that in this embodiment, the formwork may be an aluminum formwork, a steel formwork or a wood formwork with ribs on one side, and the first heat insulation layer is disposed on the side with the ribs.
As will be readily understood, in the related art, in the manufacture of the insulation layer, a flame-retardant polyurethane foaming agent is generally sprayed on the outer surface of the formwork to form the insulation layer. In this embodiment, it is also preferable to spray with a flame retardant polyurethane foam.
S200, arranging at least one heat-preservation component fixedly connected with the template on the first heat-preservation layer;
in this embodiment, at least one heat preservation assembly fixed to the template is arranged on the first heat preservation layer, so that the first heat preservation layer can be subjected to auxiliary heat preservation in actual use, and meanwhile, the fixing effect of the first heat preservation layer can be improved through the arranged heat preservation assembly, so that the first heat preservation layer is not prone to falling off.
It can be further explained that, in the practical application process, when the heat preservation assembly is set, the set number of the heat preservation assembly can be determined according to the temperature condition in the practical construction environment. It can be further exemplified that two or three insulation assemblies are provided if the temperature value in the actual construction environment is low, such as below-30 ℃. When the number of the arranged heat insulation assemblies is more than two, the heat insulation assemblies are arranged on the quilt side of the template in a mode of opposite ends in sequence, and the specific arrangement method is that the first heat insulation assembly is fixedly connected with the template, and the second heat insulation assembly and the third heat insulation assembly are sequentially connected with the second heat insulation assembly and the third heat insulation assembly. Of course, in practical use, the second heat preservation component or the third heat preservation component can also be directly and fixedly connected with the template. However, no matter which connection mode is adopted, the first heat preservation assembly should be attached to the first heat preservation layer, and the second heat preservation assembly and the third heat preservation assembly are sequentially far away from the first heat preservation layer and are arranged on the same side as the first heat preservation assembly.
By adopting the setting mode, the temperature of the heat preservation layer can be effectively and actively adjusted in the practical use process of the heat preservation system, and the heat preservation function is further assisted and promoted.
It can be further exemplified that the structure exemplified in the present embodiment can be applied to construction of extremely cold regions (such as high altitude regions of the qinghai-tibet plateau, north and south poles, and the like).
S300, completely coating the heat insulation assembly with a second heat insulation material to obtain a second heat insulation layer, and forming a heat insulation template;
in this embodiment, when the second insulating layer is applied, the second insulating layer can be applied once no matter how many insulating assemblies are arranged, and all the arranged insulating assemblies are directly and completely coated. By adopting the construction mode, the manufacturing time of the heat preservation template is effectively reduced, and the construction efficiency is improved.
It should be particularly clear and explained that, in this embodiment, the heat preservation template refers to a heat preservation function provided by the combined action of the first heat preservation layer, the heat preservation component and the second heat preservation component. It can be further stated that the heat preservation function of the heat preservation template is realized by the combined action of the first heat preservation layer, the second heat preservation layer and the heat preservation assembly.
Of course, in this embodiment, only one heat preservation assembly may be provided, and the output temperature of the heat preservation assembly may be directly increased during actual use.
S400, enclosing at least four heat preservation templates at the periphery of a to-be-cast cantilever beam to form a cantilever beam casting space;
in this embodiment, at least four heat preservation templates are adopted, and the to-be-poured cantilever beam is completely covered by the heat preservation templates, so as to form a cantilever beam pouring space. In this embodiment, it can be further stated that, when the cantilever beam casting space is manufactured, the shape of the cantilever beam casting space is often determined according to the specific shape of the cantilever beam. In the correlation technique, the common cantilever beam is mostly a box girder type structure. The assembly is that when the box girder type cantilever beam structure is constructed, the cantilever beam pouring space formed by enclosing is defined by an internal template structure arranged inside the cantilever beam and an external template structure arranged outside the cantilever beam together to form a sandwich type cantilever beam pouring space. When the suspended cast beam pouring space needs to be enclosed, at least eight heat preservation templates are used. Inner four blocks and outer four blocks.
By adopting the technical scheme, the purpose of preventing the heat-insulating body sprayed on the outer side surface of the template from falling off is achieved, and the heat-insulating effect of the heat-insulating template is effectively improved.
S500, preheating the heat insulation template through the heat insulation assembly so as to enable the pouring space of the suspension casting beam to reach a target temperature;
s600, carrying out construction and maintenance on the cantilever beam at the target temperature to obtain a finished prestressed cantilever beam.
The cantilever beam is not supported at both ends, one end of the cantilever beam is buried or poured on the support, and the other end of the cantilever beam extends out of the support.
The cantilever beam is not a floor slab with direct supports (pillars and solid walls) on each side, one part is buried or poured in a building structure, and the other part extends out of the cantilever structure and is a cantilever plate (such as a cantilever balcony or a cantilever roof).
The cast-in-place method is mostly adopted for construction of the cantilever beam, and most of the cantilever beam of the cast-in-place construction is the prestressed cantilever beam. The prestressed suspension casting beam in actual use is mostly obtained by construction through a tensioning method and a mud jacking method. The requirements on the strength and the hardness of the cantilever beam are high when the cantilever beam is constructed by the stretching and pulling method, so that the cantilever beam needs to reach the designed strength when the cantilever beam is constructed by the stretching and pulling method.
The tension method is to add tension in advance in the component, so that the applied prestress tension component bears compressive stress, and further the component generates certain deformation to deal with the load of the structure, including the load of the component self weight, wind load, snow load, earthquake load action and the like. Generally, steel strands, jacks, anchor plates and clamping pieces are used for tensioning.
The grouting is grouting in a corrugated pipe of a prestressed beam after the steel strand is tensioned, and is used for compacting the pipe, fixing the steel strand and helping the steel strand to bear force.
Before the engineering structural member bears external load, the steel strand in the tension module is applied with pretension stress, so that the bending resistance and rigidity of the member are improved, the occurrence time of cracks is delayed, and the durability of the member is improved. In the mechanical structure, the pre-stressing means that the structure can be stressed, and the advantages are that the rigidity of the structure per se can be improved, the vibration and the elastic deformation are reduced, the elastic strength of the tension module can be obviously improved, and the original resistance is stronger.
The method comprises the steps that a first heat preservation layer is arranged on one side of a template to be used by adopting a first heat preservation material, at least one heat preservation assembly fixed with the template is arranged on the first heat preservation layer, then a second heat preservation layer is arranged on the first heat preservation layer by adopting the heat preservation material same as the first heat preservation layer to obtain a heat preservation template structure, at least four heat preservation template structures are enclosed at the periphery of the cantilever beam to be poured to form a cantilever beam pouring space, the cantilever beam pouring space is preheated at the same time, the cantilever beam pouring space reaches a target temperature, cantilever beam pouring construction and maintenance are carried out at the target temperature, and a finished prestressed cantilever beam is obtained. The invention realizes the purpose of effectively preserving the heat of the suspension cast beam when the suspension cast beam construction is carried out in the alpine or low-temperature area, and solves the technical defect of poor heat preservation effect of the heat preservation body when the suspension cast beam heat preservation construction is carried out in the same environment in the prior art.
Based on the above embodiment, another embodiment of the thermal insulation construction method for the suspended cast beam in the alpine region is provided, which is shown in fig. 2 to 4: FIG. 2 is a schematic flow chart of another embodiment of the heat preservation construction method for the suspended cast beam in the alpine region; FIG. 3 is a schematic flow chart of a heat preservation construction method for a suspended cast beam in a severe cold area according to another embodiment of the present invention; fig. 4 is a flow chart showing a construction method for heat preservation of a suspended cast beam in a severe cold area according to still another embodiment of the present invention.
Optionally, the step of arranging the first heat-insulating layer on one side of the template to be used by using the first heat-insulating material includes:
s101, mixing a polyurethane foaming agent and a flame retardant according to a target ratio to obtain the heat-insulating material;
and the polyurethane foaming agent and the flame retardant are mixed according to the proportion of 1:1 and sprayed on the outer side surface of the template to form the flame retardant coating. In this embodiment, the mixture spraying that adopts polyurethane foam and fire retardant to form forms the heat preservation on the outside surface of template for the heat preservation has still possessed fire-retardant function on the basis that possesses the heat preservation function, has effectively avoided leading to the hidden danger that partial material burns and causes the incident because of long-term high temperature.
In a preferred embodiment, the polyurethane foam is a high molecular polymer prepared by mixing isocyanate and polyether as main raw materials with a special device under the action of various auxiliary agents such as a blowing agent, a catalyst, a flame retardant and the like, and then spraying the mixture at high pressure to foam the mixture in situ. Polyurethane has both soft and hard foams. The soft bubbles are in an open pore structure, and the hard bubbles are in a closed pore structure; soft foams are classified into skinned and non-skinned.
The flame retardant is a functional auxiliary agent for endowing the inflammable polymer with flame retardancy, and is mainly designed aiming at the flame retardancy of a high polymer material; flame retardants are of various types and are classified into additive type flame retardants and reactive type flame retardants according to the method of use.
The additive flame retardant is added into the polymer by a mechanical mixing method to make the polymer have flame retardancy, and the additive flame retardant mainly comprises an organic flame retardant and an inorganic flame retardant, a halogen flame retardant (organic chloride and organic bromide) and non-halogen. Organic flame retardants are represented by bromine, phosphorus-nitrogen, red phosphorus and compounds, and inorganic flame retardants are mainly flame retardant systems such as antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon and the like.
The reactive flame retardant is used as a monomer to participate in polymerization reaction, so that the polymer contains a flame retardant component, and the reactive flame retardant has the advantages of less influence on the service performance of a polymer material and lasting flame retardance.
S102, processing the surface of the template to obtain a target surface;
s103, spraying the heat-insulating material on the target surface.
Through the process, the template to be used has a primary passive heat preservation function, and the structure of the embodiment can be used in an environment with a lower temperature, such as an environment approaching the freezing temperature.
Optionally, the target ratio is a mass ratio, and the ratio of the target ratio is greater than 0 and not greater than 2.
As an improved example, in this example, in order to simulate the heat preservation effect of winter construction, a simulation test is performed indoors, and the test method is as follows:
a40 cm multiplied by 40cm test model is made by adopting a flame-retardant polyurethane foaming agent, electronic thermometers are respectively arranged at the positions of the model, which are 5cm, 15cm and 20cm away from the outer end, and the test model is placed in a freezer for a freezing test.
The internal temperature of the model was substantially the same as ambient temperature by the 5 hour freeze test, as shown in table 1 below.
TABLE 1
According to the reflection of test data, after 5-hour freezing test, the temperature of 3 parts in the model is consistent with the ambient temperature, and the concrete does not reach the final setting condition within 5 hours, so that the heat preservation effect cannot be achieved.
Further, in order to achieve the external heat insulation effect, the concrete construction requirements cannot be met by singly adopting the heat insulation material for wrapping, and through further analysis experiments, the heating wires are fixed on the external heat insulation steel wire mesh to block external low-temperature transmission.
By the same test method as the above test, 40cm × 40cm × 40cm test models were prepared using a flame retardant polyurethane foaming agent, electronic thermometers were installed at positions 5cm, 15cm and 20cm from the outer ends of the models, respectively, and the test models were put in a freezer for a freezing test.
Through 5 hours of freezing tests, the measured internal temperature of the model can reach constant temperature after being reduced to a certain degree, and external heat preservation conditions are guaranteed, which are shown in table 2 below.
TABLE 2
The test data shows that after 5-hour freezing test, the temperature of 3 parts in the model reaches a constant temperature condition, wherein the temperature of 15cm and 20cm away from the outer surface can be kept constant at 8 ℃, and the requirement of concrete heat preservation is met.
Through the scheme, in the practical application process, the polyurethane foam agent and the flame retardant are preferably mixed in a ratio of 1: 1.
However, it can be further illustrated that, in practical application, the ratio of the polyurethane foam agent to the flame retardant agent can be selected to be 2:1 according to actual construction requirements to manufacture the heat insulation material. The concrete proportion can be determined according to the environment temperature in the actual environment where the suspended casting beam is located, and when the environment temperature of the construction environment is low (such as approaching to 0 ℃), the thermal insulation material can be manufactured according to the proportion of 2: 1.
Optionally, the step of providing at least one heat-insulating assembly fixedly connected to the formwork on the first heat-insulating layer includes:
s201, arranging at least one hole communicated with the target surface on the first heat-preservation layer to form a fixing position;
in this embodiment, it can be further exemplified that the insulating layer support framework includes:
the steel wire mesh is laid on the outer side surface of the template; and
at least one reinforcing bar drag hook, the reinforcing bar drag hook includes first end and second end, first end colludes to be in on the steel reinforcement cage, the second end is fixed on the outside surface of template.
In the embodiment, the steel wire mesh is laid on the outer side surface of the template, at least one steel bar drag hook is welded on the outer side surface of the template, and the steel wire mesh is fixed by the steel bar drag hook, so that the purpose of fixing the heat-insulating layer supporting framework on the outer side surface of the template is finally realized. Further solves the technical defect that the sprayed heat-insulating layer is easy to fall off when the heat-insulating layer is manufactured on the outer surface of the template in the related technology.
It should be noted that, as a preferred embodiment, in this embodiment, the steel mesh with a pore size of 3cm × 3cm is preferably used. The steel bar draw hook is preferably made of phi 8 steel bars, and one steel bar draw hook is preferably arranged at intervals of 60cm multiplied by 80cm according to the size of the rib of the template.
S202, correspondingly placing at least one fixing piece in the fixing position, and enabling the fixing piece to be fixedly connected with the target surface to form a fixing support;
in this embodiment, it is clear that the fixing element and the fixing support of this embodiment are the steel bar pulling hook of this embodiment.
S203, fixedly placing a support frame on the fixed support to form a support framework;
in this embodiment, it can be understood that the supporting framework in this embodiment is the reinforcing mesh in this embodiment.
And S204, fixedly arranging a temperature adjusting piece on the supporting framework to obtain the heat preservation assembly.
Optionally, the ratio of the thickness of the second insulating layer to the thickness of the first insulating layer is not less than 1/2.
It can be further stated that, in the present embodiment, when the first heat-insulating layer is manufactured in an environment of-20 ℃, the thickness of the first heat-insulating layer is preferably 10cm, and then the thickness of the second heat-insulating layer is preferably 5 cm. The thickness of the second insulating layer can be determined according to the environment temperature of the actual environment where the suspension casting beam is located, and the lower the actual environment temperature is, the thicker the thickness of the second insulating layer is.
Optionally, the heat preservation module is preheated by the heat preservation assembly, so that the casting space of the cantilever beam reaches a target temperature, and the method includes the following steps:
the heat-insulating layer is preheated through the temperature adjusting piece, so that the temperature in the cantilever beam pouring space rises, and the temperature in the cantilever beam pouring space is detected and adjusted through the temperature adjusting piece, so that the temperature adjusting piece is controlled to stop preheating when the temperature in the cantilever beam pouring space reaches the target temperature.
It may be further stated that said temperature adjustment member comprises:
the main heating belt is laid on the steel wire mesh and communicated with an external heat source or a power source; and
at least two mountings, at least two the mounting all will main heating area with wire net fixed connection.
In the embodiment, the main heating belt is arranged, and the main heating belt is fixed on the steel wire mesh by the at least two fixing pieces, so that the suspended cast beam can be subjected to continuous heat preservation in the high-cold low-temperature environment, and the technical defect of temperature loss caused by temperature shock of the high-cold low-temperature environment is effectively overcome.
It should be particularly clear and explained that, as a preferred embodiment, in the present embodiment, the main heating belt is an existing structure capable of introducing an external heat source or performing spontaneous heating under the supply of external power or energy. In the present embodiment, the main heating belt is preferably a conventional technology or structure capable of realizing self-heating under the driving or supplying of external power (such as a heat pump, an air pump, etc.) or external energy (such as electric energy, solar energy, fossil energy, etc.), and the present embodiment is only applied thereto. Preferably, this embodiment may exemplify that the main heating belt is a heating wire that performs self-heating under the action of electricity.
Of course, it can be further explained that the fixing member is an existing fixing member capable of fixing the main heating belt on the steel wire mesh. Fasteners that may be generally employed by those skilled in the art include, but are not limited to, the following types: the existing components such as a binding belt, a binding wire or a hoop can fix the main heating belt on the steel wire mesh.
In order to further improve the thermal insulation performance of the present invention, optionally, the method further includes:
the standby heating belt is laid on the steel wire mesh;
the fixing piece is used for fixedly connecting the standby heating belt with the steel wire mesh.
Through setting up reserve heating band to utilize the mounting to fix reserve heating band on the steel wire net, when main heating band can not normally work, the technical staff can adopt reserve heating band to heat the heat-insulating body at once, so that the heat-insulating body can keep warm to the cantilever beam under the most suitable temperature.
It should be particularly clear and explained that, as a preferred embodiment, in the present embodiment, the backup heating belt is an existing structure capable of introducing an external heat source or performing self-heating under the supply of external power or energy. In the present embodiment, the backup heating band is preferably a prior art or a structure that can realize self-heating under the driving or supplying of external power (such as a heat pump, an air pump, etc.) or external energy (such as electric energy, solar energy, fossil energy, etc.), and the present embodiment is only applied to this. Preferably, this embodiment may exemplify that the backup heating belt is a heating wire that performs spontaneous heating under the action of electric power.
Optionally, the construction and maintenance of the cantilever beam at the target temperature to obtain a finished prestressed cantilever beam product includes the following steps:
s601, configuring a mixture for casting the cantilever beam, and modulating the temperature of the mixture to enable the temperature of the mixture to reach a target casting temperature;
s602, pouring the mixture kept at the target mixing temperature into the pouring space of the cantilever beam at the target temperature to form a cantilever beam structure to be maintained;
s603, carrying out heat preservation maintenance on the cantilever beam structure to be maintained at the target temperature to obtain a target cantilever beam;
s604, removing the formwork, and performing tensioning and grouting construction on the target suspension casting beam to obtain a finished product of the prestressed suspension casting beam.
In this embodiment, the strength of the beam concrete must reach 95% of the design value during the prestressed tensioning, the elastic modulus reaches 90% of the design value, and the tensioning can be performed after the concrete age is not less than 7 days.
And a fuel oil warm air gun is arranged in each box room at the top of the poured cantilever beam section, and the box rooms are heated through the skylight opening, so that the maintenance environment is improved.
A pulping heat preservation shed is built on the top surface 0# block of the box girder (the pulping heat preservation shed is built by adopting scaffolds, and the color steel plate is packaged), an electric heating furnace is adopted for heating the inside of the pulping heat preservation shed, the area requirement can meet the requirements of storing and operating a grouting machine, the size requirement is not less than 20m2, and the temperature of grouting materials and mixing water can meet the construction requirement.
In order to prevent the grouting material from being frozen and ensure the grouting quality, the grouting material adopts 'HS-DYL anti-freezing type prestressed pipeline grouting material'. The HS-DYL antifreezing prestressed pipeline grouting material is prepared by finely mixing an inorganic gelling agent and various mineral materials. The product is convenient to use and can be used by directly adding water. The antifreeze grouting material has a chloride ion content of less than or equal to 0.06 and does not rust the steel strand. The strength requirement can be achieved under the low temperature environment (-20 ℃). Meets the standard requirements of technical Specifications for highway, bridge and culvert construction (JTG/T F50-2020) and prestressed duct grouting agent (GB/T25182-2010).
The performance indexes of the antifreeze prestressed pipeline grouting material are as follows:
TABLE 3
And (4) keeping the same-condition maintenance test piece in the grouting process, placing the test piece on the top surface of the beam body, and reflecting the same-condition strength of the grout. And curing the test pieces of each group of grouting materials under the same conditions to obtain no less than 3 groups, and respectively detecting the strength for 3 days, 7 days and 28 days.
By adopting the scheme, the prestressed cantilever beam structure meeting the design requirement is manufactured in the high-cold or low-temperature environment.
As an improved embodiment, in this embodiment, optionally, the tensioning and grouting construction of the cantilever beam exposed in the natural environment to make the prestress of the cantilever beam reach the design value includes the following steps:
tensioning the cantilever beam to change the prestress of the cantilever beam;
carrying out grouting construction on the cantilever beam, and adjusting the prestress of the cantilever beam to enable the prestress of the cantilever beam to reach a design value;
by carrying out tensioning construction on the cantilever beam reaching the designed strength, the prestress of the cantilever beam reaches the designed value.
Grouting construction is carried out on the cantilever beam, and the prestress of the cantilever beam is adjusted, so that the prestress of the cantilever beam reaches the design value:
the duration from the completion of slurry mixing to the pressing of the pore channel of the suspended casting beam is not more than 40 min;
in the embodiment, the duration from the completion of slurry mixing to the pressing of the hole of the cantilever beam is not more than 40min, so that the whole quality of the prestressed cantilever beam cannot be influenced by the slurry mixing due to consolidation.
It is further required that the optimum duration time is not longer than 15min, and the consolidation effect of the slurry can be effectively guaranteed in the time range.
Grouting construction is carried out on the cantilever beam, and the prestress of the cantilever beam is adjusted, so that the prestress of the cantilever beam reaches the design value:
the temperature of the slurry is kept between 5 and 30 ℃ during grouting.
In this embodiment, the advantage of maintaining the temperature of the slurry at 5-30 ℃ is that in this temperature range, the water material in the slurry will not be solidified due to too low temperature, and the overall strength of the slurry is strongly guaranteed.
Of course, it can be further stated that the slurry has an optimum temperature value of 20 ℃.
Optionally, the mixture comprises aggregate, cement and water for mixing, wherein the strength grade of the cement is not lower than 42.5, and the water-cement ratio is more than 0 and not more than 0.5.
In the embodiment, the ordinary portland cement or portland cement with the strength grade not lower than 42.5 is adopted, so that the cement has a faster setting effect when in use, can be solidified and hardened more quickly, and has high early strength and good frost resistance. And the water-cement ratio is not more than 0.5, so that the coagulation and solidification efficiency of cement is further accelerated, and the coagulation and solidification time is shortened.
Optionally, the temperature of the blending water is greater than 5 ℃ and not greater than 60 ℃.
In this embodiment, when the temperature is less than 5 ℃, this hidden danger of water icing easily appears, when the water temperature of mix is greater than 60 ℃, can lead to the intensity of mix to receive the influence. In a preferred embodiment, the temperature of the blending water is preferably 15 ℃ to 30 ℃ in the present example, and more preferably, the temperature of the blending water is preferably 20 ± 2 ℃.
Optionally, the mixing time of the mixture is 1.5 times of the natural normal-temperature mixing time;
in this embodiment, set up mixing time for natural normal atmospheric temperature mixing time's 1.5 times, can effectively promote the degree of consistency of stirring material, also can make the more even of mixture temperature dispersion simultaneously.
The target pouring temperature is not lower than 10 ℃.
The method comprises the steps that a first heat preservation layer is arranged on one side of a template to be used by adopting a first heat preservation material, at least one heat preservation assembly fixed with the template is arranged on the first heat preservation layer, then a second heat preservation layer is arranged on the first heat preservation layer by adopting the heat preservation material same as the first heat preservation layer to obtain a heat preservation template structure, at least four heat preservation template structures are enclosed at the periphery of the cantilever beam to be poured to form a cantilever beam pouring space, the cantilever beam pouring space is preheated at the same time, the cantilever beam pouring space reaches a target temperature, cantilever beam pouring construction and maintenance are carried out at the target temperature, and a finished prestressed cantilever beam is obtained. The invention realizes the purpose of effectively preserving the heat of the suspension cast beam when the suspension cast beam construction is carried out in the alpine or low-temperature area, and solves the technical defect of poor heat preservation effect of the heat preservation body when the suspension cast beam heat preservation construction is carried out in the same environment in the prior art.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents made by the contents of the present specification and drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A heat preservation construction method for a suspended cast beam in an alpine region is characterized by comprising the following steps:
arranging a first heat-preservation layer on one side of a template to be used by adopting a first heat-preservation material;
arranging at least one heat insulation component fixedly connected with the template on the first heat insulation layer;
completely coating the heat insulation assembly by using a second heat insulation material to obtain a second heat insulation layer, and forming a heat insulation template;
enclosing at least four heat-insulating templates at the periphery of a suspended cast beam to be cast to form a suspended cast beam casting space;
preheating the heat-insulating template through the heat-insulating assembly so as to enable the pouring space of the cantilever beam to reach a target temperature;
and carrying out construction and maintenance on the cantilever beam at the target temperature to obtain a finished prestressed cantilever beam.
2. The alpine region cantilever beam heat insulation construction method according to claim 1, wherein a first heat insulation layer is arranged on one side of a template to be used by adopting a first heat insulation material, and the method comprises the following steps:
mixing a polyurethane foaming agent and a flame retardant according to a target proportion to obtain the heat-insulating material;
processing the surface of the template to obtain a target surface;
and spraying the heat-insulating material on the target surface.
3. The heat preservation construction method for the cantilever beam in the alpine region according to claim 2, wherein the target ratio is a mass ratio, and the ratio of the target ratio is greater than 0 and not greater than 2.
4. The heat preservation construction method for the cantilever beam in the alpine region according to claim 2, wherein at least one heat preservation assembly fixedly connected with the formwork is arranged on the first heat preservation layer, and the method comprises the following steps:
arranging at least one hole communicated with the target surface on the first heat-preservation layer to form a fixing position;
correspondingly placing at least one fixing piece in the fixing position, and fixedly connecting the fixing piece with the target surface to form a fixing support;
a support frame is fixedly placed on the fixed support to form a support framework;
and fixedly arranging a temperature adjusting piece on the supporting framework to obtain the heat insulation assembly.
5. The heat preservation construction method for the suspended cast beam in the alpine region according to claim 4, wherein the ratio of the thickness of the second heat preservation layer to the thickness of the first heat preservation layer is not less than 1/2.
6. The heat preservation construction method for the cantilever beam in the alpine region according to claim 4, wherein the heat preservation formwork is preheated through the heat preservation assembly so that the pouring space of the cantilever beam reaches a target temperature, and the method comprises the following steps:
the heat preservation layer is preheated through the temperature adjusting piece, so that the temperature in the cantilever beam pouring space rises, and the temperature in the cantilever beam pouring space is detected and adjusted through the temperature adjusting piece, so that the temperature adjusting piece is controlled to stop preheating when the temperature in the cantilever beam pouring space reaches the target temperature.
7. The heat preservation construction method for the cantilever beam in the alpine region according to claim 2, wherein the cantilever beam construction and maintenance are performed at the target temperature to obtain a finished prestressed cantilever beam, comprising the steps of:
preparing a mixture for casting the cantilever beam, and modulating the temperature of the mixture to enable the temperature of the mixture to reach a target casting temperature;
pouring the mixture kept at the target mixing temperature into the pouring space of the cantilever beam at the target temperature to form a cantilever beam structure to be maintained;
carrying out heat preservation maintenance on the cantilever beam structure to be maintained at the target temperature to obtain a target cantilever beam;
and removing the formwork, and performing tensioning and grouting construction on the target cantilever beam to obtain a finished prestressed cantilever beam.
8. The alpine region suspended cast beam heat preservation construction method according to claim 7, wherein the mixture includes aggregate, cement and water for mixing, the strength grade of the cement is not lower than 42.5, and the water-cement ratio is more than 0 and not more than 0.5.
9. The heat preservation construction method for the suspended cast beam in the alpine region according to claim 8, wherein the temperature of the mixing water is greater than 5 ℃ and not greater than 60 ℃.
10. The insulated construction method for the suspended cast beam in the alpine region according to claim 8, wherein the mixing time of the mixture is 1.5 times of the natural normal temperature mixing time;
and/or the presence of a gas in the gas,
the target pouring temperature is not lower than 10 ℃.
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