CN114525741A - Beam body heat insulation construction method adjacent to existing line cantilever beam - Google Patents
Beam body heat insulation construction method adjacent to existing line cantilever beam Download PDFInfo
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- CN114525741A CN114525741A CN202210153815.8A CN202210153815A CN114525741A CN 114525741 A CN114525741 A CN 114525741A CN 202210153815 A CN202210153815 A CN 202210153815A CN 114525741 A CN114525741 A CN 114525741A
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- 238000009413 insulation Methods 0.000 title claims abstract description 35
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 238000004321 preservation Methods 0.000 claims abstract description 99
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 76
- 239000010959 steel Substances 0.000 claims abstract description 76
- 230000001681 protective effect Effects 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 32
- 230000003014 reinforcing effect Effects 0.000 claims description 14
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 12
- 239000003063 flame retardant Substances 0.000 claims description 12
- 239000004088 foaming agent Substances 0.000 claims description 12
- 229920002635 polyurethane Polymers 0.000 claims description 12
- 239000004814 polyurethane Substances 0.000 claims description 12
- 239000002023 wood Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000009415 formwork Methods 0.000 claims 1
- 230000009545 invasion Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 15
- 238000009434 installation Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004035 construction material Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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- 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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- 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
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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
- 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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- 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
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Abstract
The invention discloses a beam body heat insulation construction method adjacent to an existing line cantilever beam, and belongs to the technical field of cantilever beam winter construction adjacent to the existing line. The beam body heat insulation construction method adjacent to the existing line cantilever beam comprises the following steps: binding steel bars to form a steel bar box body; installing a first automatic telescopic arm framework; building a beam body box chamber; erecting a second automatic telescopic arm framework on one side of the beam box chamber; after concrete pouring is finished, a first heat preservation layer is arranged on the second automatic telescopic arm framework, a second heat preservation layer is arranged on the first automatic telescopic arm framework, and the first heat preservation layer and the second heat preservation layer are connected to form a closed heat preservation body. According to the invention, the closed heat-insulating body is built to replace a hanging basket type heat-insulating shed, and compared with the hanging basket type heat-insulating shed, the closed heat-insulating body has smaller volume, smaller space between the closed heat-insulating body and the beam box chamber and more stable structure, so that the potential safety hazard of invasion limit to the existing line is reduced while the engineering quality is ensured.
Description
Technical Field
The invention relates to the technical field of cantilever beam winter construction adjacent to an existing line, in particular to a beam body heat-insulation construction method adjacent to the existing line.
Background
The existing line refers to a line which is already built originally, and the existing line is called the existing line when a new building or a reconstruction of the line is usually carried out.
In the related art, when a cast-in-place bridge is constructed in winter, heat insulation measures need to be taken to prevent concrete from cracking in the solidification process and affecting the engineering quality, and a basket-hanging type heat insulation shed is often erected on the periphery of a bridge box body template to be poured to insulate the cast-in-place concrete.
At present, the potential safety hazard of limit invasion caused by erecting a hanging basket type heat-preservation shed to an existing line influences the running of a train, and loose connecting points are possibly caused in the process of forward movement of a hanging basket, so that individual plates of the heat-preservation shed are blown off, and accidents are caused.
Disclosure of Invention
The invention mainly aims to provide a beam body heat-insulation construction method adjacent to an existing line cantilever beam, and aims to solve the technical problem that the potential safety hazard of limit invasion of the existing line is caused by erecting a hanging basket type heat-insulation shed in the prior art.
In order to achieve the purpose, the invention provides a beam body heat-insulation construction method adjacent to an existing line cantilever beam, which comprises the following steps:
binding steel bars to the box body of the cantilever beam to form a steel bar box body;
installing a first automatic telescopic arm framework, wherein the first automatic telescopic arm framework is arranged above the steel bar box body;
building a beam body box chamber, wherein the periphery of the steel bar box body is wrapped by the beam body box chamber, and one side of the beam body box chamber is connected with a pier;
erecting a second automatic telescopic arm framework on one side of the beam box chamber, which is far away from the bridge pier;
after concrete pouring is finished, a first heat preservation layer is arranged on the second automatic telescopic arm framework, a second heat preservation layer is arranged on the first automatic telescopic arm framework, the first heat preservation layer and the second heat preservation layer are connected to form a closed heat preservation body, and the closed heat preservation body covers the beam box chamber completely.
Optionally, the method of forming a closed insulation includes the steps of:
uniformly paving waterproof sandwich heat-insulation cotton on the second automatic telescopic arm framework to form a first heat-insulation layer;
hanging a waterproof sandwich heat-insulating door curtain on the first automatic telescopic arm framework to form a second heat-insulating layer;
and overlapping the first heat preservation layer and the second heat preservation layer to form a closed heat preservation body.
Optionally, the method for building the first automatic telescopic arm framework comprises the following steps:
at least 4 jibs are set up in the outside of reinforcing bar box, at least 4 the jib encloses to be established the top of reinforcing bar box, at least 4 the jib is followed the periphery of reinforcing bar box sets up, forms first automatic flexible arm skeleton.
Optionally, the method for erecting the second automatic telescopic boom framework on the side of the beam body box chamber, which is away from the pier, comprises the following steps:
connecting at least 2 support groups on one side of the beam body box chamber, which faces away from the bridge pier, wherein at least 2 support groups are spaced from each other;
erecting a wood board on the support group;
and erecting the mesh on the wood board, so that the mesh is arranged above the beam box chamber in an overhead manner to form a second automatic telescopic arm framework.
Optionally, the beam body thermal insulation construction method adjacent to the existing line cantilever further includes:
erecting a template at the periphery of the steel bar box body to form a beam box chamber;
paving and hanging a steel wire mesh on the outer side of the template, wherein the steel wire mesh completely covers the beam box chamber;
at least 2 flexible hollow protective sleeves are arranged on the steel wire mesh;
penetrating an electric heating tape into the flexible hollow protective sleeve;
and spraying a flame-retardant polyurethane foaming agent on the steel wire mesh to form an outer heat-insulating layer, wherein the outer heat-insulating layer completely covers the flexible hollow protective sleeve and the steel wire mesh.
Optionally, the distance between every two adjacent support groups is greater than or equal to 3 m.
Optionally, the method for completely covering the beam box chamber with the steel wire mesh includes the following steps:
connecting the end part of the steel wire mesh with the template;
and connecting one end of a steel bar drag hook with the steel wire mesh, and connecting the other end of the steel bar drag hook with the template.
Optionally, the beam body heat insulation construction method adjacent to the existing cantilever beam further includes the following steps:
spraying a flame-retardant polyurethane foaming agent on the steel wire mesh to form a first heat-insulating layer;
connecting the flexible hollow protective sleeve with the steel wire mesh;
and spraying a flame-retardant polyurethane foaming agent on the first heat-insulating layer and the flexible hollow protective sleeve to form a second heat-insulating layer, wherein the first heat-insulating layer and the flexible hollow protective sleeve are covered by the second heat-insulating layer.
Optionally, the thickness of the first heat insulation layer is greater than or equal to 10cm, and the thickness of the second heat insulation layer is greater than or equal to 5 cm.
Optionally, at least 2 of the flexible hollow protective sleeves are spaced apart from each other, and the spacing between adjacent 2 of the flexible hollow protective sleeves is greater than or equal to 6 cm.
According to the technical scheme, the hanging basket type heat-preservation shed is replaced by the built airtight heat-preservation body, and compared with the hanging basket type heat-preservation shed, the airtight heat-preservation body is smaller in size, smaller in space between the airtight heat-preservation body and the beam box chamber, better in heat-preservation effect and more stable in structure, engineering quality is guaranteed, and meanwhile potential safety hazards of limit invasion to existing lines are reduced.
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 construction flow diagram of the beam body heat preservation construction method adjacent to the existing line cantilever beam.
The implementation, functional features and advantages of the objects of the present invention will be further explained 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 the directional indicators (such as up, down, 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 otherwise expressly stated or limited, 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; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, 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 relating to "first", "second", etc. in the embodiments 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 to implicitly indicate 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, technical solutions between various 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 of the present invention.
In the related art, the existing line refers to a line that has been built originally, and usually, when a new line is to be built or a line is to be modified, the existing line is called the existing line.
When a cast-in-place bridge is constructed in winter, heat insulation measures need to be taken to prevent concrete from cracking in the solidification process and affecting the engineering quality, and a basket-hanging type heat insulation shed is often erected on the periphery of a bridge box body template to be poured to insulate the cast-in-place concrete.
However, the erection of the hanging basket type heat-preservation shed can cause the potential safety hazard of invasion limit on the existing line, influence the operation of the train, and possibly cause the loosening of connection points in the process of forward movement of the hanging basket, thereby causing the blowing-off of individual plates of the heat-preservation shed and accidents.
Therefore, the invention provides a beam body heat preservation construction method adjacent to the existing line cantilever beam, which replaces a hanging basket type heat preservation shed by building a closed heat preservation body, and compared with the hanging basket type heat preservation shed, the closed heat preservation body has smaller volume, smaller space between the closed heat preservation body and a beam body box chamber, better heat preservation effect and more stable structure, ensures the engineering quality and reduces the potential safety hazard of limit invasion to the existing line.
The inventive concept is further elucidated below in connection with some embodiments.
Referring to fig. 1, fig. 1 is a schematic construction flow diagram of an embodiment of a beam body heat preservation construction method adjacent to an existing line cantilever beam.
In an embodiment of the present invention, as shown in fig. 1, the method for constructing a beam body adjacent to an existing cantilever beam by using a thermal insulation method includes the following steps:
s100: binding steel bars to the box body of the cantilever beam to form a steel bar box body;
s200: installing a first automatic telescopic arm framework, wherein the first automatic telescopic arm framework is arranged above the steel bar box body;
s300: building a beam body box chamber, wherein the periphery of the steel bar box body is wrapped by the beam body box chamber, and one side of the beam body box chamber is connected with a pier;
s400: erecting a second automatic telescopic arm framework on one side of the beam box chamber, which is far away from the bridge pier;
s500: after concrete pouring is finished, a first heat preservation layer is arranged on the second automatic telescopic arm framework, a second heat preservation layer is arranged on the first automatic telescopic arm framework, the first heat preservation layer and the second heat preservation layer are connected to form a closed heat preservation body, and the closed heat preservation body covers the beam box chamber completely.
In one embodiment, steel bars are erected on the box body of the cantilever beam, so that the steel bars are erected to form a steel bar box body meeting the actual design requirement, after the steel bar box body is erected, the steel bar box body is located at the top end of the pier, and the steel bar box body is connected with reserved steel bars of the pier, so that the steel bar box body and the pier are connected into a whole;
then, the first automatic telescopic arm framework can be erected above the steel bar box body by utilizing a support or a scaffold, so that the first automatic telescopic arm framework is arranged around the steel bar box body in a surrounding manner;
erecting a beam box chamber according to the size requirement of an actual steel bar box body so as to enable the beam box chamber to wrap the periphery of the steel bar, and connecting one side of the beam box chamber with a pier in order to ensure the stability of the beam box chamber after the beam box chamber is erected;
according to the size of an actual beam box chamber, erecting a second automatic telescopic arm framework on one side of the beam box chamber, which is far away from a pier, wherein the second automatic telescopic arm framework can be arranged above the beam box chamber in an overhead mode, a position for laying a steam pipeline is reserved for a subsequent concrete steam curing process, and when the concrete steam curing process needs to be carried out, the steam pipeline can be laid between the second automatic telescopic arm framework and the beam box chamber;
for the shaping effect of guaranteeing the concrete, after concreting, lay first heat preservation immediately on the automatic flexible arm skeleton of second, make first heat preservation evenly cover the outside at roof beam body case top, then, lay the cold preservation of second on the automatic flexible arm skeleton of first, make the cold preservation of second evenly cover the outside all around at roof beam body case, at this moment, the cold preservation of second encloses around establishing at first heat preservation, connect first heat preservation and second heat preservation and form airtight heat preservation, airtight heat preservation covers roof beam body case completely, with the heat preservation effect to roof beam body case, thereby ensure the shaping quality of concrete.
According to the technical scheme, the hanging basket type heat preservation shed is replaced by the built airtight heat preservation body, and the space between the airtight heat preservation shed and the beam box chamber is smaller, so that the airtight heat preservation body is smaller in size, better in heat preservation effect and more stable in structure compared with the hanging basket type heat preservation shed, the engineering quality is guaranteed, meanwhile, the potential safety hazard of limit invasion to the existing line is reduced, the disassembly and the installation are convenient, the construction time is saved, and the construction efficiency is improved.
Optionally, the method of forming a closed insulation includes the steps of:
a100: uniformly paving waterproof sandwich heat-insulation cotton on the second automatic telescopic arm framework to form a first heat-insulation layer;
a200: hanging a waterproof sandwich heat-insulating door curtain on the first automatic telescopic arm framework to form a second heat-insulating layer;
a300: and overlapping the first heat preservation layer and the second heat preservation layer to form a closed heat preservation body.
When the first heat preservation layer is laid, according to the size requirement of the actual beam box chamber, the waterproof sandwich heat preservation cotton is flatly laid on the second automatic telescopic arm framework above the top of the beam box chamber, the waterproof sandwich heat preservation cotton covers the top of the beam box chamber, the waterproof sandwich heat preservation cotton extends from the top of the beam box chamber to the bottom of the beam box chamber, and the waterproof sandwich heat preservation cotton can extend by more than or equal to 1m to cover the end of the beam box chamber and ensure the heat preservation effect;
when the second heat-preservation layer is hung, the waterproof sandwich heat-preservation door curtain is hung on the installed hoisting framework, and the waterproof heat-preservation door curtain is arranged around the beam box room in a surrounding manner so as to surround 4 side surfaces of the beam box room;
and then the first heat preservation layer and the second heat preservation layer are overlapped to form a closed heat preservation body, so that a closed environment is provided for the subsequent steam curing process of the concrete, the implementation effect of the steam curing process is ensured, and the forming quality of the concrete is ensured.
Optionally, the method for building the first automatic telescopic arm framework comprises the following steps:
b100: at least 4 jibs are set up in the outside of reinforcing bar box, at least 4 the jib encloses to be established the top of reinforcing bar box, at least 4 the jib is followed the periphery of reinforcing bar box sets up, forms first automatic flexible arm skeleton.
When setting up the jib, can adopt support or scaffold frame, fix the one end of support or scaffold frame and the cantilever beam of having constructed completion before or, be connected the jib again with the other end of support or scaffold frame, can adopt the fastener to fix the jib during the connection, when guaranteeing follow-up installation second thermal layer, the stability on second thermal layer, the jib can set up 4 at least, 4 jib evenly distributed are around the reinforcing bar box, and set up along the top periphery of reinforcing bar box, form first automatic flexible arm skeleton.
Optionally, the method for erecting the second automatic telescopic boom framework on the side of the beam body box chamber, which is away from the pier, comprises the following steps:
c100: connecting at least 2 support groups on one side of the beam body box chamber, which faces away from the bridge pier, wherein at least 2 support groups are spaced from each other;
c200: erecting a wood board on the support group;
c300: and erecting the mesh on the wood board, so that the mesh is arranged above the beam box chamber in an overhead manner to form a second automatic telescopic arm framework.
In order to save construction materials and reduce construction cost, at least 2 support groups are spaced from each other, and the distance between every two adjacent support groups is determined according to the actual size of the beam box chamber;
after one end of the support group is arranged at the edge of the top of the beam box chamber, a wood plate is erected at the other end of the support group, and 1 wood plate is arranged corresponding to 1 support group, so that the stability of the wood plate is ensured, and the stability of a subsequently erected net sheet is ensured;
in one embodiment, the mesh sheets can be formed by welding reinforcing steel bars, mesh sheets with the mesh size of 50cm by 50cm and the mesh sheet size of 200cm by 400cm are welded by using phi 25 reinforcing steel bars, in order to ensure the subsequent steam curing effect on concrete, the spacing distance between the mesh sheets and the top of the beam box chamber is more than or equal to 30cm, and the second automatic telescopic arm framework is formed after the mesh sheets are erected on the wood plates.
Optionally, in order to achieve the external thermal insulation effect, ensure the construction quality of the concrete, and ensure that the external thermal insulation system of the beam meets the operational safety of the existing line, the beam thermal insulation construction method adjacent to the existing line cantilever beam further includes:
d100: erecting a template at the periphery of the steel bar box body to form a beam box chamber;
d, 200: paving and hanging a steel wire mesh on the outer side of the template, wherein the steel wire mesh completely covers the beam box chamber;
d300: at least 2 flexible hollow protective sleeves are distributed on the steel wire mesh;
d400: penetrating an electric heating tape into the flexible hollow protective sleeve;
d500: and spraying a flame-retardant polyurethane foaming agent on the steel wire mesh to form an outer insulating layer, wherein the outer insulating layer completely covers the flexible hollow protective sleeve and the steel wire mesh.
In one embodiment, the beam box chamber can be composed of templates, the templates are selected according to the actual size of the steel bar box body, and the templates are erected on the periphery of the steel bar box body to form the beam box chamber;
in winter, in order to prevent sudden temperature drop, a steel wire mesh is laid and hung on the outer side of the template, and the steel wire mesh completely covers the beam body box chamber so as to facilitate installation of an external heat insulation layer;
in order to ensure the heat preservation effect, at least 2 flexible hollow protective sleeves are distributed on the steel wire net through binding wires, one ends of the binding wires are bound with the flexible hollow protective sleeves, and the other ends of the binding wires are bound with the steel wire net;
an electric heating belt penetrates into the flexible hollow protective sleeve so as to provide heat for the external heat-insulating layer subsequently, ensure the heat-insulating effect of the external heat-insulating layer and balance the temperature difference between the external heat-insulating layer and the beam box chamber;
after the electric heating tape is installed, flame-retardant polyurethane foaming agent is sprayed on the steel wire mesh to form an outer heat-insulating layer, and the formed heat-insulating layer completely covers the flexible hollow protective sleeve.
In one embodiment, the construction sequence for forming the girder box chamber can be template positioning, bottom plate and web steel bar binding, prestressed duct positioning, internal mold installation, top plate steel bar binding, concrete pouring, concrete curing, tensioning and grouting.
Optionally, the distance between every two adjacent support seat groups is greater than or equal to 3 m.
In order to save materials, 2 adjacent support groups are arranged at intervals, the interval size is determined according to the actual size of the actual beam box chamber, and the distance between the 2 adjacent support groups is larger than or equal to 3 m.
Optionally, the method for completely covering the beam box chamber with the steel wire mesh includes the following steps:
e100: connecting the end part of the steel wire mesh with the template;
e200: and connecting one end of a steel bar drag hook with the steel wire mesh, and connecting the other end of the steel bar drag hook with the template.
For guaranteeing the stability of wire net, with the tip of wire net and the rib welded fastening in the template to utilize the reinforcing bar drag hook to fix wire net and template, the one end of reinforcing bar drag hook and the one end welding of wire net, the other end and the template rib welded fastening of reinforcing bar drag hook.
Optionally, the beam body heat insulation construction method adjacent to the existing cantilever beam further includes the following steps:
f100: spraying a flame-retardant polyurethane foaming agent on the steel wire mesh to form a first heat-insulating layer;
f200: connecting the flexible hollow protective sleeve with the steel wire mesh;
f300: and spraying a flame-retardant polyurethane foaming agent on the first heat-insulating layer and the flexible hollow protective sleeve to form a second heat-insulating layer, wherein the first heat-insulating layer and the flexible hollow protective sleeve are covered by the second heat-insulating layer.
In order to ensure the heat preservation effect of the outer heat preservation layer, the outer heat preservation layer consists of a first heat preservation layer and a second heat preservation layer, flame retardant polyurethane foaming agent is sprayed on the steel wire mesh to form the first heat preservation layer, after the first heat preservation layer is formed, the flexible hollow protective sleeve is fixed by using a binding wire, one end of the binding wire is bound with the flexible hollow protective sleeve, the other end of the binding wire is bound with the steel wire mesh, after the flexible hollow protective sleeve is fixed, an electric heating tape penetrates into the flexible hollow protective sleeve, the flame retardant polyurethane foaming agent is sprayed on the first heat preservation layer and the flexible hollow protective sleeve to form the second heat preservation layer, and the second heat preservation layer covers the first heat preservation layer and the flexible hollow protective sleeve.
Optionally, the thickness of the first heat insulation layer is greater than or equal to 10cm, and the thickness of the second heat insulation layer is greater than or equal to 5 cm.
In order to ensure the heat preservation effect of the outer heat preservation layer, the thickness of the first heat preservation layer can be more than or equal to 10cm, and the thickness of the second heat preservation layer can be more than or equal to 5 cm.
Optionally, in order to ensure the heat preservation effect on the beam body box chamber and prevent the heat preservation effect on the beam body box chamber from being influenced by the damage of a certain electric heating belt, at least 2 flexible hollow protective sleeves are spaced from each other, and the distance between every two adjacent flexible hollow protective sleeves is greater than or equal to 6 cm.
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 of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A beam body heat insulation construction method adjacent to an existing line cantilever beam is characterized by comprising the following steps:
binding steel bars to the box body of the cantilever beam to form a steel bar box body;
installing a first automatic telescopic arm framework, wherein the first automatic telescopic arm framework is arranged above the steel bar box body;
building a beam body box chamber, wherein the periphery of the steel bar box body is wrapped by the beam body box chamber, and one side of the beam body box chamber is connected with a pier;
erecting a second automatic telescopic arm framework on one side of the beam box chamber, which is far away from the bridge pier;
after concrete pouring is finished, a first heat preservation layer is arranged on the second automatic telescopic arm framework, a second heat preservation layer is arranged on the first automatic telescopic arm framework, the first heat preservation layer and the second heat preservation layer are connected to form a closed heat preservation body, and the closed heat preservation body covers the beam box chamber completely.
2. A method of insulating a beam adjacent an existing line cantilever according to claim 1, wherein the method of forming a closed insulation comprises the steps of:
uniformly paving waterproof sandwich heat-insulation cotton on the second automatic telescopic arm framework to form a first heat-insulation layer;
hanging a waterproof sandwich heat-insulating door curtain on the first automatic telescopic arm framework to form a second heat-insulating layer;
and overlapping the first heat preservation layer and the second heat preservation layer to form a closed heat preservation body.
3. The method for constructing a beam body adjacent to an existing cantilever beam by using heat insulation as claimed in claim 1, wherein the method for erecting the first automatic telescopic arm framework comprises the following steps:
at least 4 jibs are set up in the outside of reinforcing bar box, at least 4 the jib encloses to be established the top of reinforcing bar box, at least 4 the jib is followed the periphery of reinforcing bar box sets up, forms first automatic flexible arm skeleton.
4. The method for constructing a beam body adjacent to an existing line cantilever according to claim 2, wherein the method for erecting the second automatically telescopic arm framework on the side of the beam body chamber away from the pier comprises the following steps:
connecting at least 2 support groups on one side of the beam body box chamber, which faces away from the bridge pier, wherein at least 2 support groups are spaced from each other;
erecting a wood board on the support group;
and erecting the mesh on the wood board, so that the mesh is arranged above the beam box chamber in an overhead manner to form a second automatic telescopic arm framework.
5. The method of constructing a beam adjacent to an existing wire cantilever according to claim 1 or 3, wherein the method of constructing a beam adjacent to an existing wire cantilever further comprises:
installing a template at the periphery of the steel bar box body to form a beam box chamber;
paving and hanging a steel wire mesh on the outer side of the template, wherein the steel wire mesh completely covers the beam box chamber;
at least 2 flexible hollow protective sleeves are distributed on the steel wire mesh;
penetrating an electric heating tape into the flexible hollow protective sleeve;
and spraying a flame-retardant polyurethane foaming agent on the steel wire mesh to form an outer heat-insulating layer, wherein the outer heat-insulating layer completely covers the flexible hollow protective sleeve and the steel wire mesh.
6. The method for constructing a beam body adjacent to an existing line cantilever according to claim 4, wherein: the distance between every two adjacent support seat groups is larger than or equal to 3 m.
7. The beam body heat preservation construction method adjacent to the existing line cantilever beam as claimed in claim 5, wherein the method for completely covering the beam body box chamber by the steel wire mesh laid on the outer side of the formwork comprises the following steps:
connecting the end part of the steel wire mesh with the template;
and connecting one end of a steel bar drag hook with the steel wire mesh, and connecting the other end of the steel bar drag hook with the template.
8. The method of claim 7, wherein the method of constructing the existing line cantilever beam adjacent to the existing line cantilever beam further comprises the steps of:
spraying a flame-retardant polyurethane foaming agent on the steel wire mesh to form a first heat-insulating layer;
connecting the flexible hollow protective sleeve with the steel wire mesh;
and spraying a flame-retardant polyurethane foaming agent on the first heat-insulating layer and the flexible hollow protective sleeve to form a second heat-insulating layer, wherein the second heat-insulating layer covers the first heat-insulating layer and the flexible hollow protective sleeve.
9. The method for constructing a beam body adjacent to an existing line cantilever according to claim 8, wherein: the thickness of the first heat-insulating layer is more than or equal to 10cm, and the thickness of the second heat-insulating layer is more than or equal to 5 cm.
10. The method for constructing a beam body adjacent to an existing line cantilever according to claim 9, wherein: at least 2 flexible hollow protective sleeves are spaced from each other, and the distance between every two adjacent flexible hollow protective sleeves is larger than or equal to 6 cm.
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