CN105780672A - Heating device for prestress steel plate and control method - Google Patents
Heating device for prestress steel plate and control method Download PDFInfo
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- CN105780672A CN105780672A CN201610142776.6A CN201610142776A CN105780672A CN 105780672 A CN105780672 A CN 105780672A CN 201610142776 A CN201610142776 A CN 201610142776A CN 105780672 A CN105780672 A CN 105780672A
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- steel plate
- controller
- temperature sensor
- heating
- electric heating
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a heating device for a prestress steel plate and a control method. The heating device for the prestress steel plate comprises a long-strip-shaped box with a U-shaped cross section, a plurality of heating cables arranged on the upper surface of a bottom plate of the box, a heat conductive partition plate arranged above the heating cables, a controller, a dial gauge making contact with the free end of the prestress steel plate, and a temperature sensor making contact with the prestress steel plate. The two ends of the long-strip-shaped box are open, and the heating cables extend in the length direction of the box. The controller is electrically connected with the dial gauge, the temperature sensor and the heating cables. The heating device for the prestress steel plate has the characteristics that the heating device can be used for heating prestress heating plates on a bridge reinforcing site, the construction difficulty is effectively reduced, and the construction efficiency is improved.
Description
Technical field
The present invention relates to Technology Bridge Strengthening field, especially relate to that a kind of heating accuracy is high, difficulty of construction is low, be effectively improved prestress steel heating apparatus and the control method of efficiency of construction.
Background technology
When carrying out bridge plate and reinforcing, usually the pre-stressed steel plate being used for reinforcement bridge plate is heated in advance, then the pre-stressed steel plate heated is placed into bridge plate bottom install, due in the process installed, the temperature meeting rapid decrease of pre-stressed steel plate, improve the difficulty of construction, and exist and need repeatedly heating repeatedly could meet the problem of construction requirement, reduce efficiency of construction.
Chinese patent mandate publication number: CN104314014A, authorize publication date on January 28th, 2015, a kind of method disclosing pre-stressed steel plate reinforced concrete bridge, carry out according to following steps: concrete surface processes needs the region of fixation steel plate to clear up on two adjacent beam slabs of bridge, reject top layer loose matter, remove surface laitance, remove surface dust；Boring is planted and is buried screw rod and determine screw hole position according to designing requirement and hole；Then adopt structure glue to plant and bury screw rod, until structure glue solidification-stable；According to the calculating planting screw position and the coefficient of expansion buried, steel plate to be pasted is carried out supporting punching, then the sticking veneer of steel plate is eliminated rust and coarse process；Steel plate heats, fixes and heat steel plate to 50 to 60 DEG C, is set on immediately after in aforementioned screw rod；Affixing steel plate is coated with filling structure glue between concrete surface and affixing steel plate, it is ensured that fill closely between the two；Then fix with nut screwing clamping；Surface of steel plate preservative treatment.The weak point of this invention is, heating accuracy is low, difficulty of construction is high.
Summary of the invention
The goal of the invention of the present invention is to overcome the deficiency that the heating means of pre-stressed steel plate causing in prior art, difficulty of construction is high, efficiency of construction is low, it is provided that a kind of prestress steel heating apparatus that can be used for on-the-spot heating.
To achieve these goals, the present invention is by the following technical solutions:
A kind of prestress steel heating apparatus, including the strip casing that cross section is concave shape, some that are located on the plate upper surface of casing add electric heating cable, it is located at the heat conduction baffle that each bar adds on electric heating cable, controller, the dial gauge contacted with pre-stressed steel plate free end and the temperature sensor contacted with pre-stressed steel plate；Strip tank ends opening, each bar adds electric heating cable and extends along the length direction of casing；Controller adds electric heating cable with dial gauge, temperature sensor and each bar respectively and electrically connects.
Strip casing is used for holding pre-stressed steel plate, and each bar adds electric heating cable for heating to pre-stressed steel plate, and pre-stressed steel plate and each bar are added electric heating cable and isolate and conduct heat by heat conduction baffle.
Present invention transport is reinforced scene to bridge plate, makes pre-stressed steel plate contact with heat conduction baffle, controller is provided with length threshold W, make temperature sensor contact with pre-stressed steel plate, with support, casing is stably supported；
Controller controls each bar heating electric cable heating, the temperature of temperature sensor detection pre-stressed steel plate, the length w ' of centimeter check pre-stressed steel plate elongation, and as w ' >=W, the controller each bar of control adds electric heating cable and stops heating；
Make temperature sensor separate with pre-stressed steel plate, pre-stressed steel plate is installed on bridge plate, make heat conduction baffle separate with pre-stressed steel plate.
After using the present invention, it is possible in the process that pre-stressed steel plate is heated, pre-stressed steel plate is installed on bridge plate, the length being effectively ensured pre-stressed steel plate reaches construction requirement, do not need repeatedly repeatedly to heat pre-stressed steel plate, reduce the difficulty of construction, improve efficiency of construction.
Therefore, the present invention has and can be used for on-the-spot heating, effectively reduces difficulty of construction, improves the feature of efficiency of construction.
As preferably, being provided with the cavity that cross section is concave shape in described casing, be filled with glass fibre cotton in cavity.
As preferably, described heat conduction baffle both sides of the edge contact with box inside wall, and heat conduction baffle adopts iron material to make.
As preferably, described in add electric heating cable and be 3 to 5, each bar adds electric heating cable and arranges at equal intervals, and bar adds electric heating cable and is mineral insulated cable.
As preferably, casing lateral wall is provided with some to handle.
The control method of a kind of prestress steel heating apparatus, comprises the steps:
(6-1) controller is provided with length threshold W, by pre-stressed steel plate lower surface and heat conduction baffle upper surface, makes temperature sensor contact with pre-stressed steel plate, with support, casing is stably supported；
(6-2) controller controls each bar heating electric cable heating, the temperature of temperature sensor detection pre-stressed steel plate, the length w ' of centimeter check pre-stressed steel plate elongation, and as w ' >=W, the controller each bar of control adds electric heating cable and stops heating；
(6-3) make temperature sensor separate with pre-stressed steel plate, pre-stressed steel plate is installed on bridge plate, make heat conduction baffle separate with pre-stressed steel plate.
As preferably, also including alarm and memorizer, alarm and memorizer and be all electrically connected with the controller；Temperature sensor fault detecting step was also included before step (6-1):
Memorizer is provided with the standard temperature signal curve of temperature sensor；
(7-1) controller obtains temperature signal curve S (t) of temperature sensor, and controller extracts temperature signal value M corresponding with each interval in S (t)1..., Mn；The sequence number of design temperature signal value is i, i=1 ..., n；
(7-2) controller utilizes formulaCalculate each temperature signal value MiSteady rate ratioi；
When S (t) and standard temperature signal curve are without the ratio of intersection point and each temperature signal valueiBe respectively positioned on outside [1-A1,1+A1] scope, then controller control alarm sends the warning message of abnormality of temperature sensors.
As preferably, the lower edges at steel band two ends is connected with 2 blocks of wing plates respectively each through weld seam, set weld seam shearing strength asThe tensile strength of steel band is f, and the axle center static load of steel band and each wing plate connecting portion is the cross-sectional area that M, M=fA, A are steel band；
Replace with as w ' >=W:
As w ' >=W andTime, H1For fusion length, H2For weld bead height.
Therefore, there is advantages that and can be used at bridge strengthening scene, pre-stressed steel plate being heated, effectively reduce difficulty of construction, improve efficiency of construction.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention；
Fig. 2 is a kind of flow chart of embodiments of the invention；
Fig. 3 is a kind of theory diagram of the present invention.
In figure: strip casing 1, add electric heating cable 2, heat conduction baffle 3, controller 4, dial gauge 5, temperature sensor 6, alarm 7, memorizer 8, pre-stressed steel plate 9, cavity 11, handle 12.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment 1
Embodiment as shown in Figure 1 is a kind of prestress steel heating apparatus, including the strip casing 1 that cross section is concave shape, it is located on the plate upper surface of casing 3 and adds electric heating cable 2, it is located at the heat conduction baffle 3 that each bar adds on electric heating cable, controller 4, the dial gauge 5 contacted with pre-stressed steel plate free end and the temperature sensor 6 contacted with pre-stressed steel plate；Strip tank ends opening, each bar adds electric heating cable and extends along the length direction of casing；Electrically connect as it is shown on figure 3, controller adds electric heating cable with dial gauge, temperature sensor and each bar respectively.Also include alarm 7 and memorizer 8, alarm and memorizer are all electrically connected with the controller.
It is provided with the cavity 11 that cross section is concave shape in casing, in cavity, is filled with glass fibre cotton.Heat conduction baffle both sides of the edge contact with box inside wall, and heat conduction baffle adopts iron material to make.Each bar adds electric heating cable and arranges at equal intervals, and bar adds electric heating cable and is mineral insulated cable.Casing lateral wall is provided with 2 pairs of handles 12.
As shown in Figure 1 and Figure 2, the control method of a kind of prestress steel heating apparatus, comprise the steps:
Step 90, temperature sensor fault detects
Memorizer is provided with the standard temperature signal curve of temperature sensor；
Step 91, controller obtains temperature signal curve S (t) of temperature sensor, and controller extracts temperature signal value M corresponding with each interval in S (t)1..., Mn；The sequence number of design temperature signal value is i, i=1 ..., n；
Step 92, controller utilizes formulaCalculate each temperature signal value MiSteady rate ratioi；
When S (t) and standard temperature signal curve are without the ratio of intersection point and each temperature signal valueiBe respectively positioned on outside [1-A1,1+A1] scope, then controller control alarm sends the warning message of abnormality of temperature sensors, and A1 is 0.2；
Step 100, the preparation before pre-stressed steel plate heating
Controller is provided with length threshold W and weld seam shearing strengthBy pre-stressed steel plate 9 lower surface and heat conduction baffle upper surface, make temperature sensor contact with pre-stressed steel plate, with support, casing is stably supported；
Step 200, pre-stressed steel plate computer heating control
Controller control each bar heating electric cable heating, temperature sensor detection pre-stressed steel plate temperature, centimeter check pre-stressed steel plate elongation length w ', the lower edges at steel band two ends is connected with 2 blocks of wing plates respectively each through weld seam, set weld seam shearing strength asThe tensile strength of steel band is f, and the axle center static load of steel band and each wing plate connecting portion is the cross-sectional area that M, M=fA, A are steel band；
As w ' >=W andTime, controller controls each bar and adds electric heating cable stopping heating；Wherein, H1For fusion length, H2For weld bead height；
Step 300, prestressed steel plate
Make temperature sensor separate with pre-stressed steel plate, pre-stressed steel plate is installed on bridge plate, make heat conduction baffle separate with pre-stressed steel plate.
In the present invention, f=310N/mm2,
M=fA=310 × 1000=310kN, f are design tensile strength, and A is 1000mm2,M/(2×H1×H2)=310KN/ (2 × 500 × 10)=31N/mm2, H1For 500mm, H2For 10mm.
Steel band is of a size of the thickness of 640cm × 10cm × 1cm, embedded board and wing plate and is the chemical bolt 22 of 1cm, M16, and diameter 1.6cm, length 19cm, supporting nut thickness is 1.2cm.
Embodiment 2
Embodiment 2 includes all structures in embodiment 1 and step part, also includes temperature sensor fault detecting step before the step 100 of embodiment 1:
Memorizer is provided with the standard temperature signal curve of temperature sensor；
(7-1) controller obtains temperature signal curve S (t) of temperature sensor, and controller extracts temperature signal value M corresponding with each interval in S (t)1..., Mn；The sequence number of design temperature signal value is i, i=1 ..., n；
(7-2) controller utilizes formulaCalculate each temperature signal value MiSteady rate ratioi；
When S (t) and standard temperature signal curve are without the ratio of intersection point and each temperature signal valueiBe respectively positioned on outside [1-A1,1+A1] scope, then controller control alarm sends the warning message of abnormality of temperature sensors.
Should be understood that the present embodiment is merely to illustrate the present invention rather than restriction the scope of the present invention.In addition, it is to be understood that after having read the content that the present invention lectures, the present invention can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application appended claims limited range equally.
Claims (8)
1. a prestress steel heating apparatus, it is characterized in that, including the strip casing (1) that cross section is concave shape, be located on the plate upper surface of casing some add electric heating cable (2), it is located at the heat conduction baffle (3) that each bar adds on electric heating cable, controller (4), the dial gauge (5) contacted with pre-stressed steel plate free end and the temperature sensor (6) contacted with pre-stressed steel plate；Strip tank ends opening, each bar adds electric heating cable and extends along the length direction of casing；Controller adds electric heating cable with dial gauge, temperature sensor and each bar respectively and electrically connects.
2. prestress steel heating apparatus according to claim 1, is characterized in that, is provided with the cavity (11) that cross section is concave shape, is filled with glass fibre cotton in cavity in described casing.
3. prestress steel heating apparatus according to claim 1, is characterized in that, described heat conduction baffle both sides of the edge contact with box inside wall, and heat conduction baffle adopts iron material to make.
4. prestress steel heating apparatus according to claim 1, is characterized in that, described in add electric heating cable and be 3 to 5, each bar adds electric heating cable and arranges at equal intervals, and bar adds electric heating cable and is mineral insulated cable.
5. the prestress steel heating apparatus according to claim 1 or 2 or 3 or 4, is characterized in that, casing lateral wall is provided with some to handle (12).
6., based on a control method for the prestress steel heating apparatus described in claim 1, it is characterized in that, comprise the steps:
(6-1) controller is provided with length threshold W, by pre-stressed steel plate (9) lower surface and heat conduction baffle upper surface, makes temperature sensor contact with pre-stressed steel plate, with support, casing is stably supported；
(6-2) controller controls each bar heating electric cable heating, the temperature of temperature sensor detection pre-stressed steel plate, the length w ' of centimeter check pre-stressed steel plate elongation, and as w ' >=W, the controller each bar of control adds electric heating cable and stops heating；
(6-3) make temperature sensor separate with pre-stressed steel plate, pre-stressed steel plate is installed on bridge plate, make heat conduction baffle separate with pre-stressed steel plate.
7. the control method of the prestress steel heating apparatus described in claim 6, also includes alarm (7) and memorizer (8), and alarm and memorizer are all electrically connected with the controller；It is characterized in that, before step (6-1), also include temperature sensor fault detecting step:
Memorizer is provided with the standard temperature signal curve of temperature sensor；
(7-1) controller obtains temperature signal curve S (t) of temperature sensor, and controller extracts temperature signal value M corresponding with each interval in S (t)1..., Mn；The sequence number of design temperature signal value is i, i=1 ..., n；
(7-2) controller utilizes formulaCalculate each temperature signal value MiSteady rate ratioi；
When S (t) and standard temperature signal curve are without the ratio of intersection point and each temperature signal valueiBe respectively positioned on outside [1-A1,1+A1] scope, then controller control alarm sends the warning message of abnormality of temperature sensors.
8. the control method of the prestress steel heating apparatus described in claim 6, is characterized in that, the lower edges at steel band two ends is connected with 2 blocks of wing plates respectively each through weld seam, set weld seam shearing strength asThe tensile strength of steel band is f, and the axle center static load of steel band and each wing plate connecting portion is the cross-sectional area that M, M=fA, A are steel band；
Replace with as w ' >=W:
As w ' >=W andTime, H1For fusion length, H2For weld bead height.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610142776.6A CN105780672B (en) | 2016-03-14 | 2016-03-14 | Prestress steel heating apparatus and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610142776.6A CN105780672B (en) | 2016-03-14 | 2016-03-14 | Prestress steel heating apparatus and control method |
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| CN105780672A true CN105780672A (en) | 2016-07-20 |
| CN105780672B CN105780672B (en) | 2017-06-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3805421A1 (en) * | 1988-02-22 | 1989-09-21 | Schwaebische Huettenwerke Gmbh | Process and apparatus in the production of carriageway transitions (expansion joints) from rubber mats |
| JP3482593B2 (en) * | 1998-10-26 | 2003-12-22 | ニッタ株式会社 | Dielectric heating mold |
| CN2899365Y (en) * | 2006-04-26 | 2007-05-09 | 付成山 | Carbon-fibre felt electric heater |
| CN203934001U (en) * | 2014-07-04 | 2014-11-05 | 郝伟 | A kind of resistance type heater |
| CN104314014A (en) * | 2014-10-11 | 2015-01-28 | 岩土科技股份有限公司 | Method of reinforcing concrete bridge by prestressed steel plates |
| CN104526933A (en) * | 2014-12-22 | 2015-04-22 | 焦万成 | Single-side heat transfer electric hot press hot plate |
-
2016
- 2016-03-14 CN CN201610142776.6A patent/CN105780672B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3805421A1 (en) * | 1988-02-22 | 1989-09-21 | Schwaebische Huettenwerke Gmbh | Process and apparatus in the production of carriageway transitions (expansion joints) from rubber mats |
| JP3482593B2 (en) * | 1998-10-26 | 2003-12-22 | ニッタ株式会社 | Dielectric heating mold |
| CN2899365Y (en) * | 2006-04-26 | 2007-05-09 | 付成山 | Carbon-fibre felt electric heater |
| CN203934001U (en) * | 2014-07-04 | 2014-11-05 | 郝伟 | A kind of resistance type heater |
| CN104314014A (en) * | 2014-10-11 | 2015-01-28 | 岩土科技股份有限公司 | Method of reinforcing concrete bridge by prestressed steel plates |
| CN104526933A (en) * | 2014-12-22 | 2015-04-22 | 焦万成 | Single-side heat transfer electric hot press hot plate |
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| CN105780672B (en) | 2017-06-20 |
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Denomination of invention: Heating device and control method of prestressed steel plate Effective date of registration: 20220704 Granted publication date: 20170620 Pledgee: China Construction Bank Co.,Ltd. Fuyang Branch of Hangzhou Pledgor: GEOTECHNICAL TECHNOLOGY Co.,Ltd. Registration number: Y2022980009767 |
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