CN112854748A - Maintenance method for construction of suspension casting box girder in winter - Google Patents
Maintenance method for construction of suspension casting box girder in winter Download PDFInfo
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- CN112854748A CN112854748A CN202110262459.9A CN202110262459A CN112854748A CN 112854748 A CN112854748 A CN 112854748A CN 202110262459 A CN202110262459 A CN 202110262459A CN 112854748 A CN112854748 A CN 112854748A
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- 238000010276 construction Methods 0.000 title claims abstract description 48
- 238000012423 maintenance Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005266 casting Methods 0.000 title claims abstract description 28
- 239000000725 suspension Substances 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 141
- 238000004321 preservation Methods 0.000 claims abstract description 101
- 239000000523 sample Substances 0.000 claims abstract description 91
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 238000009413 insulation Methods 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000013461 design Methods 0.000 claims abstract description 6
- 238000009415 formwork Methods 0.000 claims description 10
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 8
- 239000011496 polyurethane foam Substances 0.000 claims description 8
- 239000003063 flame retardant Substances 0.000 claims description 6
- 230000036571 hydration Effects 0.000 claims description 6
- 238000006703 hydration reaction Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 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 4
- 238000001816 cooling Methods 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 230000001681 protective effect Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 2
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- 239000004746 geotextile Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
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- 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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
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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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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a maintenance method for construction of a suspension casting box girder in winter, which comprises the following steps: firstly, installing an external heating heat preservation template; secondly, installing an inner template and binding the section steel bars of the box girder to be poured; thirdly, installing an internal heating insulation structure and an end insulation layer; fourthly, pre-burying a temperature measuring probe; fifthly, pre-curing the box girder segment to be poured; sixthly, pouring concrete; seventhly, installing a top heat-insulating layer; and eighthly, performing steam curing on the box girder segments. The invention has novel and reasonable design, simple method steps, simple and convenient construction, easy guarantee of construction quality, good use effect and high practical value; through installing external heating heat preservation template in the outside of case roof beam festival section, and set up top heat preservation at case roof beam festival section top surface, install tip heat preservation in the cross section outside of the cantilever end of case roof beam festival section, heat insulation construction and heat the maintenance to the case roof beam festival section in the inside of case roof beam festival section sets up, solved and watered the maintenance problem of case roof beam winter construction, convenient to popularize and use of hanging.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a maintenance method for construction of a suspension casting box girder in winter.
Background
In concrete construction, the engineering quality is limited by the environmental temperature, particularly in winter construction, and the influence on the whole construction maintenance, quality and the like is large due to low environmental temperature; the temperature and humidity should be ensured in the curing process of the poured concrete, if the protection measures are not in place and are influenced by low temperature, the hydration action of the cement is hindered, the free moisture in the concrete begins to freeze, the volume is increased, the concrete is easy to crack, and the construction quality is seriously influenced. When the average outdoor daily temperature is lower than 5 ℃ for 5 consecutive days, the construction in winter is realized, the altitude in northern areas of China is high, the climate is dry, the weather is strong weather all the year round, and the basic maintenance of the construction in winter is particularly critical. At present, the construction box girder maintenance in winter mostly adopts to build the canopy warm to use heating such as coal stove to heat up in the warm canopy, need consume a large amount of fuel such as oil, coal in the maintenance period, need set up the humidity that the equipment that moisturizes keeps in the warm canopy simultaneously, increased staff intensity of labour, there is certain potential safety hazard in the work progress, and the box girder construction period is long simultaneously, and the box girder surface easily produces the crackle, and the quality is poor.
Disclosure of Invention
The invention aims to solve the technical problem that the maintenance method for the suspension casting box girder construction in winter is provided aiming at the defects in the prior art, the design is novel and reasonable, the method steps are simple, the construction is simple and convenient, the construction quality is easy to guarantee, the use effect is good, and the practical value is high; through installing the external heating heat preservation template in the outside of case roof beam festival section, and set up the top heat preservation at case roof beam festival section top surface, install tip heat preservation in the cross section outside of the cantilever end of case roof beam festival section, heat the maintenance to case roof beam festival section in the inside of case roof beam festival section sets up interior heating heat preservation structure, solved the maintenance problem of hanging to water case roof beam winter construction, be convenient for promote the use.
In order to solve the technical problems, the invention adopts the technical scheme that: a maintenance method for the construction of a suspended casting box girder in winter adopts a maintenance structure which comprises an external heating heat-preservation template arranged at the outer side of a section of the box girder to be cast and an internal heating heat-preservation structure arranged in a box chamber of the section of the box girder to be cast;
the external heating heat preservation template is an assembled heat preservation template, the assembled heat preservation template comprises a bottom template arranged at the bottom of a section of the box girder to be poured and two side templates symmetrically arranged at the left side and the right side of the bottom template, the heating type heat preservation template comprises a template, a heater arranged on the template and a template temperature measuring probe used for detecting the temperature of the heating type heat preservation template in real time;
the internal heating heat-insulation structure comprises a steam pipeline arranged in the box chamber and a steam supply system for supplying air to the steam pipeline, and the steam pipeline is arranged along the length direction of the box chamber; the method is characterized by comprising the following steps:
step one, installing an external heating heat preservation template: installing a bottom template at the bottom of the box girder segment to be poured, and installing side templates at the left side and the right side of the bottom template respectively to finish the installation of the external heating heat preservation template; wherein the bottom template and the side template are both heating type heat preservation templates;
step two, installing an inner template and binding the steel bars of the section of the box girder to be poured: installing an inner template of the box girder segment to be poured in the installed external heating heat preservation template, and binding reinforcing steel bars of the box girder segment to be poured between the inside of the external heating heat preservation template and the inner template;
step three, installing an internal heating insulation structure and an end insulation layer: respectively installing steam pipelines in a plurality of box chambers of the box girder segment to be poured, and installing an end heat preservation layer at the cantilever end of the box girder segment to be poured;
step four, pre-burying a temperature measuring probe: pre-burying a first temperature probe at the top of the box girder segment to be poured, pre-burying a second temperature probe at the end part of a flange plate of the box girder segment to be poured, pre-burying a plurality of third temperature probes at the bottom of the box girder segment to be poured, and pre-burying a fourth temperature probe at the central position of a web plate of the box girder segment to be poured to finish pre-burying of the temperature probes;
step five, pre-curing the box girder segment to be poured: a thermometer is hung and installed in the middle of the box chamber to measure the temperature of the box chamber in real time, a steam supply system is started to preheat the steel bars for pouring box girder sections, heaters of the bottom template and the side template are started to preheat the bottom template and the side template until the temperatures detected by the thermometer in the box chamber, the template temperature measuring probe in the bottom template and the template temperature measuring probe in the side template are all between 16 and 20 ℃; wherein the preheating time is 3-4 h;
step six, concrete pouring: pouring concrete in the steel bars of the box girder segment to be poured to form the box girder segment;
step seven, mounting a top heat-insulating layer: mounting a top heat-insulating layer on the top of the box girder segment, and connecting the top heat-insulating layer with the end heat-insulating layer;
step eight, steam curing of the box girder segments: and heating and maintaining the box girder segment by adjusting the heat supply temperature of the steam supply system and the heating temperatures of the heater in the bottom template and the heater in the side template until the concrete strength of the box girder segment meets the design requirement, and closing the steam supply system, the heater of the bottom template and the heater of the side template.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: the heater of the heating type heat preservation template in the first step comprises two mutually independent heating belts, wherein the two heating belts are respectively a main heating belt and a standby heating belt, the two heating belts have the same structure, and the heating belts are formed by connecting a plurality of heating belt sections in series.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: an inner heat-insulating layer and an outer heat-insulating layer which are used for coating the heater are arranged on two sides of the heater of the heating type heat-insulating template in the first step, and the inner heat-insulating layer and the outer heat-insulating layer are both flame-retardant polyurethane foam layers sprayed on the template.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: one end of the steam pipeline in the third step is connected with a steam supply system, and the other end of the steam pipeline sequentially penetrates through the No. 0 block of the suspension casting box girder and the poured box girder segment and extends into the box girder segment to be poured;
the steam supply system comprises a steam boiler, a steam conveying pipeline communicated with the steam boiler and a control gate valve arranged on the steam conveying pipeline and used for controlling the gas in the steam conveying pipeline to flow and be closed, and one end of the steam pipeline is communicated with the steam conveying pipeline.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: the number of the steam pipelines in the third step is the same as that of the box chambers of the box girder sections, and the steam pipelines correspond to the box chambers of the box girder sections one by one.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: the distance between the first temperature measuring probe and the upper surface of the concrete of the box girder segment is 4 cm-6 cm, the distance between the second temperature measuring probe and the outer surface of the concrete of the box girder segment is 4 cm-6 cm, and the distance between the third temperature measuring probe and the lower surface of the concrete of the box girder segment is 4 cm-6 cm.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: the first temperature measuring probe, the second temperature measuring probe, the third temperature measuring probe, the fourth temperature measuring probe and the template temperature measuring probe are RS-WS-N01-6-6 temperature and humidity transmitter probes, and the RS-WS-N01-6-6 temperature and humidity transmitter probes are arranged along the length direction of the box girder segment.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: in the step eight, the box girder segments are heated and maintained by adjusting the heat supply temperature of the steam supply system and the heating temperatures of the heaters in the bottom template and the side templates, and the specific process is as follows:
step 801, temperature rise: the temperature of the box chamber detected by a thermometer, the temperature of the bottom template detected by a temperature probe of the bottom template inner template and the temperature of the side template detected by a temperature probe of the side template inner template are both 25-28 ℃ within 0-2 h, and the box chamber temperature, the temperature of the bottom template and the temperature of the side template are kept at 25-28 ℃ within 3-4 h;
step 802, constant temperature: controlling the temperature of the box chamber, the temperature of the bottom template and the temperature of the side template to be 25-30 ℃ to preserve the heat of the box girder segment;
step 803, cooling: and reducing the temperature of the box chamber, the temperature of the bottom template and the temperature of the side template to 13-25 ℃ within 0-2 h, and reducing the temperature of the box chamber, the temperature of the bottom template and the temperature of the side template to 3-5 ℃ within 2-4 h.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: in step 801, the fourth temperature probe detects the hydration heat temperature t0 of the concrete inside the box girder segment, the first temperature probe, the second temperature probe and the third temperature probe detect the temperature of the outer surface of the box girder segment, the temperature values detected by the first temperature probe, the second temperature probe and the third temperature probe are respectively recorded as t11, t12 and t13, the temperature of the outer surface of the box girder segment t1 is obtained according to the condition that t1 is/3, and | t0-t1| <0.5 ℃.
The maintenance method for the construction of the suspension casting box girder in winter is characterized by comprising the following steps of: and in the step 802, the heat preservation time of the box girder segment is 28-32 h.
Compared with the prior art, the invention has the following advantages:
1. the method has the advantages of simple steps, simple and convenient construction, easy guarantee of construction quality, good use effect and high practical value.
2. The external heating and heat preservation template is arranged on the outer side of the box girder segment, the top heat preservation layer is arranged on the top surface of the box girder segment, the end heat preservation layer is arranged on the outer side of the cross section of the cantilever end of the box girder segment, and the internal heating and heat preservation structure is arranged inside the box girder segment to carry out heating maintenance on the box girder segment, so that the maintenance problem of construction of the suspension casting box girder in winter is solved.
3. According to the invention, the external heating and heat preservation structure is arranged on the outer side of the box girder to heat and preserve heat on the outer side of the box girder, the waterproof heat preservation layer used for coating the upper surface and the end surface of the box girder is arranged on the top of the box girder, and the box girder is coated in the external heating and heat preservation structure and the waterproof heat preservation layer, so that the box girder is isolated from the external environment, and the influence of cold air isolated from the external environment on the quality of the box girder is avoided.
4. The heating type heat preservation template is heated by arranging the heating belts in the heating type heat preservation template, the number of the heating belts is two, the two heating belts are independent, the two heating belts are respectively a main heating belt and a standby heating belt, when the main heating belt breaks down, the standby heating belt is used for heating the heating type heat preservation template, the normal use of the heating type heat preservation template is ensured, the heating type heat preservation template is prevented from being replaced when the heating type heat preservation template breaks down in the using process, the box girder is exposed in the external environment to cause the concrete cracking of the box girder, and the use reliability of the heating type heat preservation template is improved.
5. The heating type heat preservation template is internally provided with an inner heat preservation layer and an outer heat preservation layer, the inner heat preservation layer and the outer heat preservation layer are both flame-retardant polyurethane foam layers sprayed on the template, and the heating belt, the steel wire mesh and the template are fixedly connected into a whole by arranging the inner heat preservation layer and the outer heat preservation layer, so that the integrity of the heating type heat preservation template is enhanced; meanwhile, the heat generated by the heating belt is prevented from flowing in the combined type template through the inner heat-insulating layer, and the external cold air is blocked by the outer heat-insulating layer from entering the heating type heat-insulating template, so that the heat-insulating effect of the heating type heat-insulating template is enhanced.
6. The box chamber of the box girder is heated by the internal heating and heat insulation structure, the steam pipeline of the internal heating and heat insulation structure is arranged along the length direction of the box chamber, the length of the steam pipeline is the same as that of the box chamber, the heat dissipation area of the steam pipeline is wide, the box chamber is heated uniformly, heat is transferred to all parts of the box girder, cracks on the surface of the box girder caused by overlarge temperature difference between the inner temperature of concrete of the box girder and the outer surface of the concrete are avoided, and the pouring quality of the box girder is effectively guaranteed.
7. The steam supply system adopted by the invention is a steam boiler, steam is introduced into the box chamber of the box beam through the steam boiler to heat and maintain the box beam, and proper temperature and humidity conditions are provided for the hardening of the concrete of the box beam, so that the concrete strength of the box beam is continuously increased, and the pouring quality of the box beam is improved.
8. The box girder is heated and maintained by adopting the internal heating and heat insulation structure and the external heating and heat insulation structure, so that cracks on the surface of the box girder caused by overlarge temperature difference between the outer surface of the box girder and the inner part of the concrete are avoided, and the forming quality of the box girder during construction in winter is ensured.
In conclusion, the invention has novel and reasonable design, simple method steps, simple and convenient construction, easy guarantee of construction quality, good use effect and high practical value; through installing the external heating heat preservation template in the outside of case roof beam festival section, and set up top heat preservation at case roof beam festival section top surface, at the cross-section outside installation tip heat preservation of the cantilever end of case roof beam festival section, heat insulation construction and heat the maintenance to the case roof beam festival section in the inside of case roof beam festival section sets up, solved and watered the maintenance problem of case roof beam winter construction, convenient to popularize and use of hanging.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a block flow diagram of the method of the present invention.
FIG. 2 is a schematic structural view of a curing structure employed in the present invention.
Fig. 3 is a schematic structural diagram of a template employed in the present invention.
Fig. 4 is a schematic structural view of a heated heat-insulating template used in the present invention.
Description of reference numerals:
1, a box girder segment to be poured; 2-a chamber; 3-bottom template;
4-steel wire mesh; 5-heating a belt; 6-inner insulating layer;
7-outer insulating layer; 8-a steam pipeline; 9-a panel;
10-side ribs; 11-transverse mid-rib; 12-vertical mid-rib;
13-a steam boiler; 14-a steam delivery pipe; 15-control gate valve;
16-side form; 17-a bottom support frame; 18-lateral support frame;
19-a first temperature probe; 20-a second temperature probe; 21-third temperature probe;
22-a fourth temperature probe; 23-template temperature probe; 24-a thermometer;
25-top insulating layer; 26-threaded hole.
Detailed Description
As shown in fig. 1 and 2, the present invention includes the following steps:
step one, installing an external heating heat preservation template: installing a bottom template 3 at the bottom of the box girder segment 1 to be poured, and installing side templates 16 at the left side and the right side of the bottom template 3 respectively to finish the installation of the external heating heat preservation template; wherein the bottom template 3 and the side template 16 are both heating type heat preservation templates;
step two, installing an inner template and binding the steel bars of the section of the box girder to be poured: installing an inner template of the box girder segment 1 to be poured in the installed external heating heat preservation template, and binding the steel bar of the box girder segment 1 to be poured between the inside of the external heating heat preservation template and the inner template;
step three, installing an internal heating insulation structure and an end insulation layer: respectively installing steam pipelines 8 in a plurality of box chambers 2 of a box girder segment 1 to be poured, and installing an end heat preservation layer at a cantilever end of the box girder segment 1 to be poured;
step four, pre-burying a temperature measuring probe: pre-burying a first temperature probe 19 at the top of the box girder segment 1 to be poured, pre-burying a second temperature probe 20 at the end part of a flange plate of the box girder segment 1 to be poured, pre-burying a plurality of third temperature probes 21 at the bottom of the box girder segment 1 to be poured, and pre-burying a fourth temperature probe 22 at the central position of a web plate of the box girder segment 1 to be poured to finish pre-burying of the temperature probes;
step five, pre-curing the box girder segment to be poured: a thermometer 24 is hung and installed in the middle of the box chamber 2 to measure the temperature of the box chamber in the box chamber 2 in real time, a steam supply system is started to preheat the reinforcing steel bars of the poured box girder segment 1, heaters of the bottom template 3 and the side template 16 are started to preheat the bottom template 3 and the side template 16 until the temperatures detected by the thermometer 24 in the box chamber 2, the template temperature measuring probe 23 in the bottom template 3 and the template temperature measuring probe 23 in the side template 16 are all between 16 and 20 ℃; wherein the preheating time is 3-4 h;
step six, concrete pouring: pouring concrete into the steel bars of the box girder segment 1 to be poured to form a box girder segment;
step seven, mounting a top heat-insulating layer: mounting a top heat-insulating layer 25 on the top of the box girder segment, and connecting the top heat-insulating layer 25 with the end heat-insulating layer;
step eight, steam curing of the box girder segments: and (3) heating and curing the box girder sections by adjusting the heating temperature of the steam supply system and the heating temperatures of the heaters in the bottom formwork 3 and the side formworks 16 until the concrete strength of the box girder sections reaches the design requirement, and closing the steam supply system, the heaters of the bottom formwork 3 and the heaters of the side formworks 16.
In the embodiment, it should be noted that, in the first step, the external heating heat preservation template is installed on a hanging basket of the cantilever box girder, the hanging basket includes a bottom support frame 17 and two side support frames 18 symmetrically arranged at the left and right sides of the bottom support frame 17, the bottom template 3 is installed on the bottom support frame 17, the bottom template 3 is located at the bottom of the box girder segment 1 to be poured, the two side templates 16 are respectively installed on the two side support frames 18, and the two side templates 16 are respectively located at the left and right sides of the box girder segment 1 to be poured; in the third step, the end heat preservation layer is arranged at the cantilever end of the box girder segment 1 to be poured, in the seventh step, the top heat preservation layer 25 is arranged at the top of the box girder segment, the top heat preservation layer 25 is connected with the top of the end heat preservation layer, two side portions of the end heat preservation layer are respectively connected with two side portion templates 16 at two sides of the box girder segment 1 to be poured, the bottom of the end heat preservation layer is connected with the bottom template 3, the box girder segment is wrapped by the side portion templates 16, the bottom template 3, the top heat preservation layer 25 and the end heat preservation layer, the whole wind blocking effect of the box girder segment is reduced, the convection of the outside air is guaranteed, the heat storage and heat preservation effect of the box girder segment is guaranteed, the box girder segment is heated and maintained by the side portion templates 16, the bottom template 3 and the internal heating and heat preservation structure, and the situation that the difference between the internal temperature of the concrete of the box girder segment and the external environment temperature is The segment cracks, and the quality of the box girder segment is guaranteed.
In the fifth embodiment, when the bottom template 3, the side templates 16 and the steel bars of the box girder segment 1 to be poured are heated and maintained, the cantilever end section of the previous segment of the poured box girder segment is sprayed with hot water, and the temperature of the joint between the two segments is not lower than 5 ℃; and sixthly, selecting time with higher temperature and smaller temperature difference in the daytime when concrete is poured into the steel bars of the box girder segment 1 to be poured, so as to conveniently control the mold-entering temperature of the concrete, wherein the mold-entering temperature of the concrete is 5-30 ℃, and the preferable pouring time is 12 in the morning: 00 to 16:00 in the afternoon.
In this embodiment, in the seventh step, the top insulating layer 25 is subjected to multi-layer heat preservation, and when the multi-layer heat preservation is performed, firstly, a curing liquid is sprayed on the upper surface of the top plate of the box girder segment, so that the curing liquid forms a protective film on the upper surface of the top plate of the box girder segment, then, the top plate and the cantilever end cross section of the box girder segment are covered with a piece of wet geotextile, a layer of plastic film is covered on the wet geotextile, and finally, cotton quilt is covered on the plastic film, and the box girder segment is wrapped in the top insulating layer 25 and the external heating heat preservation template, so that the box girder segment is prevented from being exposed to the external environment.
In this embodiment, the box chamber 2 of the box girder segment is heated by the internal heating insulation structure, the steam pipeline 8 is arranged along the length direction of the box chamber 2, the length of the steam pipeline 8 is the same as that of the box chamber 2, the heat dissipation area of the steam pipeline 8 is wide, the box chamber 2 is heated uniformly, heat is transferred to all parts of the box girder segment, cracks on the surface of the box girder segment caused by overlarge temperature difference between the inner temperature of concrete of the box girder segment and the outer temperature of the outer surface of concrete are avoided, and the pouring quality of the box girder segment is effectively guaranteed.
In this embodiment, the heater of the heating type heat preservation template in the first step includes two heating belts 5 independent from each other, the two heating belts 5 are a main heating belt and a standby heating belt, respectively, the two heating belts 5 have the same structure, and the heating belt 5 is formed by connecting a plurality of heating belt segments in series.
As shown in fig. 3 and 4, in this embodiment, the template of heating type heat preservation template includes panel 9 and sets up lattice frame on the panel, and set up wire net 4 on the lattice frame, lattice frame includes the outer frame that encloses by multichannel side rib 10 and sets up support lattice in the outer frame, outer frame is laid along the edge line of panel 9, it forms to support the lattice frame to be the horizontal well rib 11 that the parallel was laid by the multichannel and the vertical well rib 12 that the multichannel was laid in parallel to assemble, every the horizontal well rib 11 all with the multichannel vertical well rib 12 fastening connection is as an organic whole, side rib 10, horizontal well rib 11 and vertical well rib 12 all are the perpendicular layout with panel 9.
In this embodiment, it should be noted that the panel 9 and the lattice frame are arranged in parallel, the panel 9 and the lattice frame are cast into a whole, the shape and the size of the outer frame are the same as those of the panel 9, the panel 9 is a square plate, the outer frame is a square frame surrounded by a plurality of the side ribs 10, the support lattice is a rectangular lattice, and the plurality of side ribs 10, the plurality of the transverse middle ribs 11, and the plurality of the vertical middle ribs 12 are uniformly distributed on the same plane; the edge rib 10 is provided with a plurality of threaded holes 26 along the length direction thereof, so that the connection of two adjacent heating type heat preservation templates is facilitated.
In the embodiment, during actual use, the steel wire mesh 4 is installed on the lattice frame of the template, the heating belt 5 penetrates through the grids of the steel wire mesh 4, the installation and the disassembly are rapid and convenient, the heating belt 5 is sleeved with the protective sleeve in a time-saving manner, the thickness of the protective sleeve is 1-2 mm, the protective sleeve is made of polyurethane foam, the polyurethane foam has good heat-insulating and waterproof performance, the protective sleeve can be effectively protected, and the normal work of the heating belt 5 cannot be influenced; the heating type heat preservation template is heated by arranging the main heating belt and the standby heating belt which are mutually independent, when the main heating belt breaks down, the standby heating belt heats the heating type heat preservation template, the normal use of the heating type heat preservation template is ensured, the heating type heat preservation template is prevented from being normally used when the heating type heat preservation template breaks down in the use process, the heating type heat preservation template needs to be replaced, the box girder segment is exposed in the external environment, the concrete of the box girder segment is prevented from cracking, and the use reliability of the heating type heat preservation template is improved.
In this embodiment, in practical use, the plurality of heating band sections of the heating band 5 all adopt the self-control temperature electric tracing band, the self-control temperature electric tracing band can emit a large amount of heat, and the heat emitted by the self-control temperature electric tracing band can be regulated and controlled and can be kept constant for a long time, so that the temperature of the heating type heat preservation template can be conveniently regulated during heating and maintenance of the box girder sections, and the maintenance quality of the box girder sections is ensured.
In this embodiment, an inner insulating layer 6 and an outer insulating layer 7 for covering the heater are disposed on two sides of the heater of the heating type insulating template in the first step, and both the inner insulating layer 6 and the outer insulating layer 7 are flame-retardant polyurethane foam layers sprayed on the template.
In this embodiment, during the in-service use, after the installation of heating tape 5 on wire net 4 was accomplished, through heat preservation 6 and outer heat preservation 7 in the fire-retardant polyurethane foam layer of on-the-spot spraying on the template, heat preservation 6 and outer heat preservation 7 including the parcel of heating tape 5, and through on-the-spot spraying fire-retardant polyurethane foam layer on the template can be as an organic whole with heating tape 5, wire net 4 and template fastening connection, strengthened the wholeness of heating formula heat preservation template, it is effectual to keep warm.
In the embodiment, in the third step, one end of the steam pipeline 8 is connected with a steam supply system, and the other end of the steam pipeline 8 sequentially penetrates through the No. 0 block of the cantilever box girder and the poured box girder segment and extends into the to-be-poured box girder segment 1;
the steam supply system comprises a steam boiler 13, a steam conveying pipe 14 communicated with the steam boiler 13, and a control gate valve 15 arranged on the steam conveying pipe 14 and used for controlling the gas circulation and the gas shutoff in the steam conveying pipe 14, wherein one end of the steam pipe 8 is communicated with the steam conveying pipe 14.
In this embodiment, during actual use, the steam conveying pipe 14 is a T-shaped steam conveying pipe, a vertical section of the steam conveying pipe 14 is exposed in the air, an end of the vertical section of the steam conveying pipe 14 is communicated with the steam boiler 13, a horizontal section of the steam conveying pipe 14 is located in the No. 0 block of the box girder segment, one end of the steam pipe 8 is communicated with the horizontal section of the steam conveying pipe 14, and the other end of the steam pipe 8 sequentially penetrates through the No. 0 block and the poured box girder segment and extends into the box girder segment to be poured 1.
In this embodiment, steam is introduced into the box chamber 2 of the box girder segment by using the steam boiler 13, and appropriate temperature and humidity conditions are provided for hardening of the concrete of the box girder segment, so that the strength of the concrete of the box girder segment is continuously increased, and the pouring quality of the box girder segment is improved.
In this embodiment, the steam boiler 13 supplies air to the steam pipeline 8 through the steam conveying pipeline 14, the control gate valve 15 is arranged on the steam conveying pipeline 14, when the box chamber 2 of the box girder segment needs to be temporarily stopped to be heated, the control gate valve 15 is closed to stop heating the box chamber 2, the steam boiler 13 does not need to stop working, the steam boiler 13 needs to be restarted when the box girder segment is reheated, the temperature rising speed of the restarted steam boiler 13 is slow, and the heating maintenance requirements of the box girder segment cannot be met in time.
In the present embodiment, the number of the steam pipes 8 in the third step is the same as the number of the box chambers 2 of the box girder segment, and the steam pipes correspond to the box girder segments one by one.
In this embodiment, the distance between the first temperature probe 19 and the upper concrete surface of the box girder segment is 4cm to 6cm, the distance between the second temperature probe 20 and the outer concrete surface of the box girder segment is 4cm to 6cm, and the distance between the third temperature probe 21 and the lower concrete surface of the box girder segment is 4cm to 6 cm.
In this embodiment, the outer surface temperature of the concrete top of the box girder segment is detected by setting the first temperature detector 19, the outer surface temperature of the flange plate end of the box girder segment is detected by setting the second temperature detector 20, and the outer surface temperature of the concrete bottom of the box girder segment is detected by setting the third temperature detector 21, so that the real-time detection of the outer surface temperature of each part of the box girder segment is realized, and the average value of the temperature data measured by the first temperature detector 19, the second temperature detector 20 and the third temperature detector 21 is taken as the measured value of the outer surface temperature of the concrete of the box girder segment, thereby improving the accuracy of the detection result.
In this embodiment, it should be noted that the left web and the right web of the box girder segment are positions where the thickness of the concrete poured in the box girder segment is the thickest, and the fourth temperature detectors 22 are respectively disposed at the central positions of the left web and the right web to detect the temperature of the hydration heat inside the concrete of the box girder segment, so as to control the temperature of the maintenance system during maintenance of the box girder segment according to the temperature of the hydration heat inside the concrete of the box girder segment, thereby preventing the surface of the box girder segment from generating cracks and ensuring the quality of the box girder segment.
In this embodiment, the first temperature measuring probe 19, the second temperature measuring probe 20, the third temperature measuring probe 21, the fourth temperature measuring probe 22 and the template temperature measuring probe 23 are all RS-WS-N01-6-6 temperature and humidity transmitter probes, and the RS-WS-N01-6-6 temperature and humidity transmitter probes are arranged along the length direction of the box girder segment.
In this embodiment, in actual use, the first temperature detector 19, the second temperature detector 20, the third temperature detector 21, the fourth temperature detector 22, and the template temperature measuring probe 23 are preferably RS-WS-N01-6-6 temperature and humidity transmitters, and the probes of the RS-WS-N01-6-6 temperature and humidity transmitters are equal to the length of the box girder segment, so that the temperature of the whole box girder segment can be detected, and the detection accuracy is high.
In this embodiment, in the eighth step, the box girder segments are heated and maintained by adjusting the heating temperature of the steam supply system and the heating temperatures of the heaters in the bottom formwork 3 and the side formworks 16, and the specific process is as follows:
step 801, temperature rise: the temperature of the box chamber detected by a thermometer 24, the temperature of the bottom template 3 detected by a template temperature probe 23 in the bottom template 3 and the temperature of the side template 16 detected by a template temperature probe 23 in the side template 16 are all 25-28 ℃ within 0-2 h, and the temperature of the box chamber, the temperature of the bottom template 3 and the temperature of the side template 16 are kept at 25-28 ℃ within 3-4 h;
step 802, constant temperature: controlling the temperature of the box chamber, the temperature of the bottom template 3 and the temperature of the side templates 16 to be 25-30 ℃ to preserve the heat of the box girder segments;
step 803, cooling: and reducing the temperature of the box chamber, the temperature of the bottom template 3 and the temperature of the side templates 16 to 13-25 ℃ within 0-2 h, and reducing the temperature of the box chamber, the temperature of the bottom template 3 and the temperature of the side templates 16 to 3-5 ℃ within 2-4 h.
In the embodiment, during actual use, the concrete strength and integrity of the box girder segment are improved by heating and maintaining the box girder segment, and the heating speed is 8-10 ℃/h when the box girder segment is heated; accelerating the development speed of the concrete strength of the box girder segments by maintaining the box girder segments at constant temperature, and reinforcing the final strength of the concrete of the box girder segments; and cooling the box girder segments to reduce the temperature of the box girder segments to a temperature which is less than the difference between the temperature of the box girder segments and the ambient temperature, and finishing the maintenance of the box girder segments.
In this embodiment, in step 801, the fourth temperature probe 22 detects the hydration heat temperature t0 of the concrete inside the box girder segment, the first temperature probe 19, the second temperature probe 20, and the third temperature probe 21 detect the temperature of the outer surface of the box girder segment, the temperature values detected by the first temperature probe 19, the second temperature probe 20, and the third temperature probe 21 are respectively denoted as t11, t12, and t13, and the temperature of the outer surface of the box girder segment t1 is obtained according to t1 ═ t11+ t12+ t13/3, and | t0-t1| <0.5 ℃.
In this embodiment, the heat preservation time of the box girder segment in step 802 is 28h to 32 h.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A maintenance method for construction of a suspension casting box girder in winter is characterized in that a maintenance structure adopted by the maintenance method comprises an external heating heat-preservation template arranged on the outer side of a box girder segment (1) to be cast and an internal heating heat-preservation structure arranged in a box chamber (2) of the box girder segment (1) to be cast;
the external heating heat preservation template is an assembled heat preservation template, the assembled heat preservation template comprises a bottom template (3) arranged at the bottom of the box girder segment (1) to be poured and two side templates (16) symmetrically arranged at the left side and the right side of the bottom template (3), the heating type heat preservation template comprises a template, a heater arranged on the template, and a template temperature probe (23) used for detecting the temperature of the heating type heat preservation template in real time;
the internal heating heat preservation structure comprises a steam pipeline (8) arranged in the box chamber (2) and a steam supply system for supplying air to the steam pipeline (8), wherein the steam pipeline (8) is arranged along the length direction of the box chamber (2); the method is characterized by comprising the following steps:
step one, installing an external heating heat preservation template: installing a bottom template (3) at the bottom of the box girder segment (1) to be poured, and installing side templates (16) on the left side and the right side of the bottom template (3) respectively to finish the installation of the external heating heat preservation template; wherein the bottom template (3) and the side template (16) are both heating type heat preservation templates;
step two, installing an inner template and binding the steel bars of the section of the box girder to be poured: installing an inner template of the box girder segment (1) to be poured in the installed external heating heat preservation template, and binding a steel bar of the box girder segment (1) to be poured between the inside of the external heating heat preservation template and the inner template;
step three, installing an internal heating insulation structure and an end insulation layer: respectively installing steam pipelines (8) in a plurality of box chambers (2) of the box girder segment (1) to be poured, and installing an end heat-insulating layer at the cantilever end of the box girder segment (1) to be poured;
step four, pre-burying a temperature measuring probe: embedding a first temperature probe (19) at the top of the box girder segment (1) to be poured, embedding a second temperature probe (20) at the end part of a flange plate of the box girder segment (1) to be poured, embedding a plurality of third temperature probes (21) at the bottom of the box girder segment (1) to be poured, and embedding a fourth temperature probe (22) at the central position of a web plate of the box girder segment (1) to be poured to finish the embedding of the temperature probes;
step five, pre-curing the box girder segment to be poured: a thermometer (24) is hung and mounted in the middle of the box chamber (2) to measure the temperature of the box chamber in the box chamber (2) in real time, a steam supply system is started to preheat the reinforcing steel bars for pouring the box girder segment (1), heaters of the bottom template (3) and the side templates (16) are started to preheat the bottom template (3) and the side templates (16) until the temperatures detected by the thermometer (24) in the box chamber (2), the template temperature measuring probes (23) in the bottom template (3) and the template temperature measuring probes (23) in the side templates (16) are all between 16 and 20 ℃; wherein the preheating time is 3-4 h;
step six, concrete pouring: pouring concrete into the steel bars of the box girder segment (1) to be poured to form a box girder segment;
step seven, mounting a top heat-insulating layer: mounting a top insulating layer (25) on the top of the box girder segment, and connecting the top insulating layer (25) with the end insulating layer;
step eight, steam curing of the box girder segments: and (3) heating and curing the box girder sections by adjusting the heating temperature of the steam supply system and the heating temperatures of the heaters in the bottom formwork (3) and the heaters in the side formworks (16) until the concrete strength of the box girder sections reaches the design requirement, and closing the steam supply system and the heaters of the bottom formwork (3) and the heaters of the side formworks (16).
2. The maintenance method for the suspension casting box girder in winter construction according to claim 1, characterized in that: the heater of the heating type heat preservation template in the first step comprises two mutually independent heating belts (5), the two heating belts (5) are respectively a main heating belt and a standby heating belt, the two heating belts (5) have the same structure, and the heating belt (5) is formed by connecting a plurality of heating belt sections in series.
3. The maintenance method for the suspension casting box girder in winter construction according to claim 1, characterized in that: in the first step, an inner heat-insulating layer (6) and an outer heat-insulating layer (7) for coating the heater are arranged on two sides of the heater of the heating type heat-insulating template, and the inner heat-insulating layer (6) and the outer heat-insulating layer (7) are both flame-retardant polyurethane foam layers sprayed on the template.
4. The maintenance method for the suspension casting box girder in winter construction according to claim 1, characterized in that: in the third step, one end of the steam pipeline (8) is connected with a steam supply system, and the other end of the steam pipeline (8) sequentially penetrates through the No. 0 block of the cantilever casting box girder and the poured box girder segment and extends into the box girder segment (1) to be poured;
the steam supply system comprises a steam boiler (13), a steam conveying pipeline (14) communicated with the steam boiler (13), and a control gate valve (15) arranged on the steam conveying pipeline (14) and used for controlling the gas in the steam conveying pipeline (14) to circulate and shut off, wherein one end of the steam pipeline (8) is communicated with the steam conveying pipeline (14).
5. The maintenance method for the suspension casting box girder in winter construction according to claim 1, characterized in that: the number of the steam pipelines (8) in the third step is the same as that of the box chambers (2) of the box girder sections, and the steam pipelines correspond to the box chambers one by one.
6. The maintenance method for the suspension casting box girder in winter construction according to claim 1, characterized in that: the distance between the first temperature measuring probe (19) and the upper concrete surface of the box girder segment is 4-6 cm, the distance between the second temperature measuring probe (20) and the outer concrete surface of the box girder segment is 4-6 cm, and the distance between the third temperature measuring probe (21) and the lower concrete surface of the box girder segment is 4-6 cm.
7. The maintenance method for the suspension casting box girder in winter construction according to claim 1, characterized in that: the first temperature measuring probe (19), the second temperature measuring probe (20), the third temperature measuring probe (21), the fourth temperature measuring probe (22) and the template temperature measuring probe (23) are all RS-WS-N01-6-6 temperature and humidity transmitter probes, and the RS-WS-N01-6-6 temperature and humidity transmitter probes are arranged along the length direction of the box girder segment.
8. The maintenance method for the suspension casting box girder in winter construction according to claim 1, characterized in that: and step eight, heating and maintaining the box girder sections by adjusting the heat supply temperature of the steam supply system and the heating temperatures of the heaters in the bottom template (3) and the side templates (16), wherein the specific process is as follows:
step 801, temperature rise: the temperature of the box chamber detected by a thermometer (24), the temperature of the bottom template (3) detected by a bottom template temperature probe (23) in the bottom template (3) and the temperature of the side template (16) detected by a side template temperature probe (23) in the side template (16) are all 25-28 ℃ within 0-2 h, and the temperature of the box chamber, the temperature of the bottom template (3) and the temperature of the side template (16) are kept at 25-28 ℃ within 3-4 h;
step 802, constant temperature: controlling the temperature of the box chamber, the temperature of the bottom template (3) and the temperature of the side template (16) to be 25-30 ℃ to preserve heat of the box girder segment;
step 803, cooling: and reducing the temperature of the box chamber, the temperature of the bottom template (3) and the temperature of the side template (16) to 13-25 ℃ within 0-2 h, and reducing the temperature of the box chamber, the temperature of the bottom template (3) and the temperature of the side template (16) to 3-5 ℃ within 2-4 h.
9. The maintenance method for the suspension casting box girder in winter construction according to claim 7, characterized in that: in step 801, the fourth temperature probe (22) detects the hydration heat temperature t0 of the concrete in the box girder segment, the first temperature probe (19), the second temperature probe (20) and the third temperature probe (21) detect the outer surface temperature of the box girder segment, the temperature values detected by the first temperature probe (19), the second temperature probe (20) and the third temperature probe (21) are respectively recorded as t11, t12 and t13, the outer surface temperature t1 of the box girder segment is obtained according to the condition that t1 is (t11+ t12+ t13)/3, and | t0-t1| <0.5 ℃.
10. The maintenance method for the suspension casting box girder in winter construction according to claim 7, characterized in that: and in the step 802, the heat preservation time of the box girder segment is 28-32 h.
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