CN114717972A - Concrete box girder bridge temperature control equipment containing heating corrugated pipe and construction method - Google Patents

Concrete box girder bridge temperature control equipment containing heating corrugated pipe and construction method Download PDF

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Publication number
CN114717972A
CN114717972A CN202210640937.XA CN202210640937A CN114717972A CN 114717972 A CN114717972 A CN 114717972A CN 202210640937 A CN202210640937 A CN 202210640937A CN 114717972 A CN114717972 A CN 114717972A
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China
Prior art keywords
box girder
heating wire
temperature
electric heating
temperature control
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Pending
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CN202210640937.XA
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Chinese (zh)
Inventor
徐刚年
王向刚
申永利
宗旭
辛星
周鑫鑫
张正鹏
陈自华
许文鹏
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Shandong Jiaotong University
China National Chemical Communications Construction Group Coltd
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Shandong Jiaotong University
China National Chemical Communications Construction Group Coltd
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Priority to CN202210640937.XA priority Critical patent/CN114717972A/en
Publication of CN114717972A publication Critical patent/CN114717972A/en
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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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

The embodiment of the invention provides a concrete box girder bridge temperature control device containing a heating corrugated pipe and a construction method, wherein the concrete box girder bridge temperature control device can ensure that the temperature of concrete at a box girder section and the temperature of pipeline concrete are not lower than 5 ℃ and the temperature difference with the atmosphere is not more than 20 ℃ in a curing stage under severe weather conditions of-20 ℃ of atmospheric temperature, strong wind, rain, snow and the like, so that the construction requirement of a standard winter stage is met, and the quality of the concrete is ensured.

Description

Concrete box girder bridge temperature control equipment containing heating corrugated pipe and construction method
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a concrete box girder bridge temperature control device comprising a heating corrugated pipe and a construction method.
Background
Construction time of a construction project in winter accounts for 1/4-1/3 of the whole year, dry and cold wind in winter in northern areas is strong, duration is long, and in order to ensure the winter construction quality of a concrete structure and save cost, a construction unit usually stops temporarily, so that the construction period is prolonged. With the acceleration of engineering construction footsteps, winter construction is no longer a slack season, and the prevention of freezing injury also becomes the central importance of engineering construction. At present, the box-type concrete structure construction has the following technical problems: (1) the wind and snow prevention temperature control equipment for the cantilever construction of the concrete box girder bridge in the winter period is simple, the heat preservation quality control technology is not high, and the concrete construction quality is difficult to ensure; (2) the prestressed pipeline is long in pipeline, difficult in grouting and heat preservation in winter and high in cost; (3) an efficient temperature control system is lacking. In order to solve the above problems and ensure the engineering quality and the construction period, it is one of the problems to be solved by those skilled in the art to provide a temperature control device for a concrete box girder bridge including a heating corrugated pipe and a winter construction method.
Disclosure of Invention
Aiming at the prior art, the embodiment of the invention provides a concrete box girder bridge temperature control device comprising a heating corrugated pipe and a construction method, a spiral heating wire is embedded in the corrugated pipe, a relation formula between a loading voltage and the stable temperature of the corrugated pipe is derived through a concrete heat absorption and heating wire heat dissipation power balance equation, and an external power supply voltage value required by the corrugated pipe to maintain a certain stable temperature meeting the construction requirement in winter is obtained through calculation, so that the problems of difficult heat preservation, high cost and the like in the construction of the concrete box girder bridge in winter are effectively solved, and the temperature and slurry health preserving quality of box girder segment cast-in-place concrete and prestressed pipeline grouting are ensured.
Specifically, an embodiment of the present invention provides a temperature control device for a concrete box girder bridge including a heating bellows, including:
the grouting heat insulation system comprises a grouting heat insulation device and a grouting temperature control device; the grouting temperature control device is used for monitoring the temperature of a plurality of monitoring points on the grouting heat insulation device and adjusting the heat insulation effect of the grouting heat insulation device;
the grouting heat preservation device comprises a corrugated pipe, the corrugated pipe is used for grouting a prestressed pipeline and comprises a pipe body and an electric heating piece; the pipe body has a certain thickness, is hollow and consists of an inner pipe wall and an outer pipe wall, wherein a certain accommodating space is formed between the inner pipe wall and the outer pipe wall; the electric heating pieces are spirally wound outside the inner pipe wall and distributed in the accommodating space formed by the inner pipe wall and the outer pipe wall; the electric heating element is used for converting electric energy into heat energy and heating the slurry passing through the inner pipe wall; and
the section box girder heat preservation system comprises a section box girder heat preservation device and a section box girder temperature control device; the temperature control device of the segmental box girder is used for monitoring the temperatures of a plurality of monitoring points on the segmental box girder heat preservation device and adjusting the heat preservation effect of the segmental box girder heat preservation device.
In some embodiments, the electric heating element is a heating wire, and the diameter of the heating wire is 1/4-1/3 of the thickness of the pipe body; the lengths of the two layers all meet the following formula:
Figure 839195DEST_PATH_IMAGE001
wherein L is the length of the heating wire, and the unit is meter; m is the number of turns of the electric heating wire wound on each layer, the unit is a turn, and n is the total number of turns, and the unit is a turn; k is the length of less than one circle, and the unit is meter; d1The inner diameter of the electric heating wire is the winding diameter, and the unit is meter; d2The winding outer diameter of the electric heating wire is meter; d is the diameter of the heating wire in meters.
In some embodiments, the heating wire extends spirally along the axis of the tube body and forms a first included angle of 77-83 degrees with the axis of the tube body, and the pitch of the spiral line formed by the heating wire is 30-60 mm.
In some embodiments, the heating wire includes a first heating wire and a second heating wire, wherein the first heating wire and the second heating wire each extend in a spiral shape along an axial direction of the tube body and form a double spiral structure.
In some embodiments, the outer tube wall of the tube further comprises a threaded protrusion extending helically along the axis of the tube and forming a second included angle with the axis of the tube; wherein the second included angle is equal to the first included angle; the wave pitch of a spiral line formed by the thread bulge is the same as that of a spiral line formed by the electric heating wire, and the electric heating wire is fixed in the thread bulge.
In some embodiments, the bellows further comprises a connection fitting disposed outside the outer tube wall for connecting adjacent two lengths of the bellows.
In some embodiments, the grouting temperature control device comprises a plurality of grouting temperature sensors and a first controller, wherein the grouting temperature sensors are attached to the outer side of the outer pipe wall and are sequentially arranged along the extension direction of the corrugated pipe; and the first controller adjusts the loading voltage of the corrugated pipe by acquiring the monitoring data of the grouting temperature sensor.
In some embodiments, the section box girder thermal insulation device comprises an electric heating furnace, a thermal insulation cover part provided with resistance wires and a thermal insulation steel template; the electric heating furnace is arranged inside a section box girder of the box girder bridge; the heat-insulating cover piece and/or the heat-insulating steel formwork are arranged outside the section box girder.
In some embodiments, a method for constructing a concrete box girder bridge in a cantilever in a winter period is further provided, which comprises the following steps:
assembling a grouting heat-preservation system and a segment box girder heat-preservation system on a segment box girder of the box girder bridge;
the first controller adjusts the loading voltage of the corrugated pipe according to the temperature of a plurality of monitoring points on the corrugated pipe and in combination with the required temperature of the corrugated pipe, so as to adjust the heating power; voltage applied to the bellows
Figure 390262DEST_PATH_IMAGE002
Wherein U is the loading voltage of the corrugated pipe and the unit is V; l is the length of the electric heating wire, and the unit is meter; m is the number of turns of the electric heating wire wound on each layer, and the unit is a turn, n is the total number of turns, and the unit is a turn; k is the length of less than one circle, and the unit is meter; d1The inner diameter of the electric heating wire is the winding diameter, and the unit is meter; d2The winding outer diameter of the electric heating wire is meter; d is the diameter of the heating wire, and the unit is meter; rlThe resistance per meter of the electric heating wire is expressed in ohm; t is half of the sum of the stable temperature and the grouting temperature of the electric heating wire, and the unit is; t isqThe unit is the outdoor average temperature;
the temperature control device of the section box girder adjusts the power of the electric heating furnace, the heat preservation cover component and the heat preservation steel template by monitoring the temperature of a plurality of monitoring points on the heat preservation device of the section box girder.
In some embodiments, the temperature control device of the segment box girder and the adjustment method of the first controller are both:
when the temperature of any monitoring point is less than 5 ℃, the first controller and the temperature control device of the segment box girder increase the power of the corrugated pipe, the electric heating furnace, the heat preservation cover piece and the heat preservation steel template controlled by the first controller and the temperature control device of the segment box girder;
when the temperature of any monitoring point is not less than 5 ℃, judging whether the temperature difference between any monitoring point and the construction environment is not less than 20 ℃; if not, the power of the corrugated pipe, the electric heating furnace, the heat preservation cover piece and the heat preservation steel template is kept; if yes, the first controller reduces the power of the corrugated pipe, and the section box girder temperature control device reduces the power of the section box girder temperature control device near the monitoring point.
Compared with the prior art, the invention has the beneficial effects that: the embodiment of the invention provides a concrete box girder bridge temperature control device containing a heating corrugated pipe and a construction method, which can ensure that the temperature of concrete of a box girder section and pipeline concrete is not lower than 5 ℃ and the temperature difference with the atmosphere is not more than 20 ℃ in a curing stage under the severe weather conditions of-20 ℃ of atmospheric temperature, strong wind, rain, snow and the like, can meet the construction requirement of a standard winter period, and can ensure the quality of the concrete.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a front view of a segmented box girder according to an embodiment of the present invention;
FIG. 2 is a sectional view illustrating construction of a concrete box girder bridge according to an embodiment of the present invention;
FIG. 3 is a front view of a bellows provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a double helix configuration of a first heating wire and a second heating wire according to one embodiment of the present invention;
FIG. 5 is a cross-sectional view of the bellows of FIG. 3, providing A-A;
FIG. 6 is a schematic structural diagram of a connection joint connection bellows according to an embodiment of the present invention;
FIG. 7 is a non-linear relationship of the loading voltage of the bellows with the temperature of the concrete after stabilization according to one embodiment of the present invention;
FIG. 8 is a non-linear relationship between the loading voltage of the bellows and the temperature of the construction environment according to an embodiment of the present invention;
FIG. 9 is a flow chart of a method for controlling the temperature of a segmented box girder according to an embodiment of the present invention;
description of reference numerals:
100. a bellows;
1. a pipe body; 11. an inner pipe wall; 12. an outer tube wall; 13. a threaded boss; 10. a first included angle;
2. an electric heating element; 21. a first heating wire; 22. a second heating wire;
3. connecting a joint;
200. a top plate; 300. a flange plate; 400. a web; 500. a base plate; 800. an electric heater; 700. monitoring points; 900. and (5) hanging a basket.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A concrete box girder bridge temperature control apparatus including a heating bellows 100 according to an embodiment of the present invention will be described with reference to fig. 1 to 6, in which a concrete box girder bridge is constructed with a cradle 900, including: a grouting heat-insulating system and a segment box girder heat-insulating system; the grouting heat insulation system comprises a grouting heat insulation device and a grouting temperature control device; the grouting temperature control device is used for adjusting the heat insulation effect of the grouting heat insulation device by monitoring the temperature of a plurality of monitoring points 700 on the grouting heat insulation device; the section box girder heat preservation system comprises a section box girder heat preservation device and a section box girder temperature control device; the temperature control device of the segment box girder adjusts the heat preservation effect of the segment box girder heat preservation device by monitoring the temperature of a plurality of monitoring points on the segment box girder heat preservation device.
The grouting heat preservation device comprises a corrugated pipe 100 used for grouting a prestressed pipeline, and the corrugated pipe 100 comprises a pipe body 1 and an electric heating piece 2; wherein the pipe body 1 has a certain thickness and is hollow and comprises an inner pipe wall 11 and an outer pipe wall 12, wherein a certain accommodating space is formed between the inner pipe wall 11 and the outer pipe wall 12; the electric heating elements 2 are spirally wound outside the inner pipe wall 11, extend along the axial direction of the pipe body 1 and are distributed in the accommodating space formed by the inner pipe wall 11 and the outer pipe wall 12; wherein the electric heating element 2 is used to convert electric energy into heat energy and heat the slurry passing through the inner pipe wall 11.
Specifically, as shown in fig. 3, the corrugated tube 100 in this embodiment is made of plastic, and has a certain thickness and is a hollow tube body 1 with two open ends, and a certain accommodating space is formed between the inner tube wall 11 and the outer tube wall 12, which is the thickness of the tube wall. And the bellows 100 may be round, flat, etc., but in actual production the bellows 100 is mostly round, with exemplary data sizes of 100mm inner diameter, 116mm outer diameter, and 3mm wall thickness. In this embodiment, the electric heating element 2 is disposed between the inner tube wall 11 and the outer tube wall 12, wherein the electric heating element 2 is an element that converts electric energy into heat energy and has a plastic shape, that is, a heating element that can be bent, coiled, wound and the like and is easy to change the shape, and the electric heating element 2 is powered on by an external power supply to convert the electric energy into heat energy for heating the slurry passing through the inner tube wall 11.
It can be understood that the electric heating element 2 can be an electric heating wire, etc. made of nickel chromium material, which is spirally wound around the outer wall of the inner pipe 11 and distributed in the accommodating space formed by the inner pipe wall 11 and the outer pipe wall 12, the center of which is located at the center of the wall thickness of the corrugated pipe 100 and extends along the axial direction of the pipe body 1, and the wave pitch of the formed spiral line is 30-60 mm; and the helix forms a first angle 10 of 77-83 with the axis of the tube 1, as shown in particular in figure 3, in which the direction of the axis of the tube 1 is as indicated by the arrow.
The diameters of the electric heating wires are 1/4-1/3 of the wall thickness of the pipe body 1; the lengths thereof all satisfy the following formula:
Figure DEST_PATH_IMAGE003
wherein L is the length of the heating wire, and the unit is meter; m is the number of turns of the electric heating wire wound on each layer, the unit is a turn, n is the total number of turns, and the unit is a turn; k is the length of less than one circle, and the unit is meter; d1The inner diameter of the electric heating wire is the winding diameter, and the unit is meter; d2The winding outer diameter of the electric heating wire is meter; d is the diameter of the heating wire in meters.
In some embodiments, the heating wires include a first heating wire 21 and a second heating wire 22, wherein the first heating wire 21 and the second heating wire 22 each extend spirally along the axial direction of the tube body 1 and form a double spiral structure.
As shown in fig. 4-5, the heating wires in this embodiment include a first heating wire 21 and a second heating wire 22, wherein the first heating wire 21 and the second heating wire 22 are spirally wound around the outer wall 11 and distributed in the accommodating space formed by the inner wall 11 and the outer wall 12, and the center of the first heating wire is located at the center of the thickness of the corrugated tube 100 and extends along the axial direction of the tube body 1 and forms a first included angle 10 of 77 ° to 83 ° with the axial line of the tube body 1; the pitch of the spiral line formed by the two heating wires is 30-60mm, and the second heating wire 22 and the first heating wire 21 form a double-helix structure by the same winding method.
It can be understood that the first heating wire 21 and the second heating wire 22 are wound in various ways, the wave crests of the first heating wire 21 and the wave troughs of the second heating wire 22 can be opposite to each other, and the first heating wire 21 and the second heating wire 22 can be arranged in parallel, as shown in fig. 3 and 4 for example, wherein the arrangement of the first heating wire 21 and the second heating wire 22 can ensure that one can still be heated normally in case of accidental damage to the other.
In some embodiments, the outer tubular wall 12 of the tubular body 1 further comprises a threaded projection 13 extending helically along the axial direction of the tubular body 1 and forming a second angle with the axial line of the tubular body 1; wherein the second included angle is equal to the first included angle 10; the wave pitch of the spiral line formed by the thread bulge 13 is the same as that of the spiral line formed by the electric heating wire, and the electric heating wire is fixed in the thread bulge 13.
Specifically, as shown in fig. 3, the outer pipe wall 12 further includes a threaded protrusion 13, the exemplary corrugated pipe 100 is mostly circular, the inner diameter of the corrugated pipe is 100mm, the outer diameter of the corrugated pipe is 116mm, and the height between the peak of the threaded protrusion 13 and the inner pipe wall 11 is 5mm when the wall thickness is 3mm, wherein the threaded protrusion 13 extends along the axial direction of the pipe body 1 and forms a second included angle with the axial line of the pipe body 1; wherein the second included angle is equal to the first included angle 10; the pitch of the helix formed by the thread protrusion 13 is the same as the pitch of the helix formed by the heating wire. In this embodiment, the first heating wire 21 and the second heating wire 22 are fixed in the thread protrusion 13, and the thread protrusion 13 is hardly damaged by the prestress tension process, and the thread protrusion 13 can be used to fix the positions of the first heating wire 21 and the second heating wire 22 between the inner tube wall 11 and the outer tube wall 12, and can also keep the spiral shapes of the first heating wire 21 and the second heating wire 22 and maintain the fixed screw pitches, thereby ensuring that the slurry passing through the inner tube wall 11 is uniformly heated.
In some embodiments, the bellows 100 further includes a connection fitting 3 disposed on the exterior of the outer tube wall 12 for connecting adjacent two lengths of the bellows 100.
As shown in fig. 6, the corrugated pipes 100 further include connection joints 3, wherein adjacent corrugated pipes 100 can be connected by using the connection joints 3, one end of each connection joint 3 is connected to a tail end of one corrugated pipe 100 and sleeved outside the outer pipe wall 12 of the corrugated pipe 100, and the other end of each connection joint 3 is connected to a head end of another corrugated pipe 100 and sleeved outside the outer pipe wall 12 of the corrugated pipe 100, so that the adjacent corrugated pipes 100 can be connected. It will be understood by those skilled in the art that sealing means such as a sealing ring, a sealant, etc. may be provided to seal the joint during the process of connecting the adjacent corrugated pipes 100 by the connecting joint 3, which is a conventional technique in the art and will not be described in detail herein.
A method of using the corrugated tubing 100, comprising the steps of:
s1, connecting the electric heating elements 2 and the pipe body 1 in the adjacent corrugated pipes 100 respectively; the connection method of the electric heating element 2 comprises the following steps: winding the heating wires in the adjacent corrugated pipes 100 for 2-3 circles to form joints; adding glass powder into the joint and electrifying to melt the glass powder; cutting open the pipe body 1 at the joint, placing the joint at the cut position of the pipe body 1 and sealing by hot melt adhesive;
it should be noted that, when the heating wires in the corrugated tube 100 include the first heating wire 21 and the second heating wire 22, the connection method of the electric heating elements 2 in the adjacent corrugated tube 100 in the step S1 is as follows: the first heating wires 21 in the adjacent corrugated pipes 100 are intertwined for 2-3 circles to form a first joint; the second heating wires 22 in the adjacent corrugated pipes 100 are intertwined for 2-3 circles to form a second joint; adding glass powder at the first joint and the second joint, and electrifying to melt the glass powder to realize the connection of the electric heating pieces 2 in the adjacent corrugated pipes 100; the tubular body 1 is then sectioned, in the vicinity of the first and second joints, and the first and second joints are respectively placed at the respective sectioned portions of the tubular body 1 and sealed with hot melt glue.
The connecting method of the pipe body 1 comprises the following steps: aligning the pipe bodies 1 of the adjacent corrugated pipes 100 and coating hot melt adhesive at the joints; the connecting joints 3 are arranged at the joint of the adjacent pipe bodies 1, and the contact positions of the two sides of the connecting joints 3 and the outer pipe wall 12 are sealed by hot melt adhesive. Specifically, the pipe bodies 1 of different shapes have different connection methods, for example, the circular pipe bodies 1 can align the pipe bodies 1 of the adjacent corrugated pipes 100 and coat the hot melt adhesive at the connection positions, the connection positions of the pipe bodies 1 are fixed again by the connection joints 3, one end of each connection joint 3 is sleeved on the outer pipe wall 12 of one corrugated pipe 100 and connected to the tail end of the other corrugated pipe 100, and the other end of each connection joint 3 is connected to the head end of the other corrugated pipe 100 and sleeved on the outer pipe wall 12 of the corrugated pipe 100, so that the adjacent corrugated pipes 100 can be connected. For the irregular-shaped pipe body 1, the adjacent pipe bodies 1 of the corrugated pipe 100 may be aligned and welded directly by using a welding method.
S2, setting the loading voltage of the electric heating element 2 according to the required temperature of the corrugated pipe 100 and electrifying; the calculation method for setting the applied voltage of the heating wire according to the required temperature of the corrugated tube 100 is as follows:
Figure 799378DEST_PATH_IMAGE002
wherein L is the length of the heating wire, and the unit is meter; m is the number of turns of the electric heating wire wound on each layer, the unit is a turn, n is the total number of turns, and the unit is a turn; k is the length of less than one circle, and the unit is meter; d1The inner diameter of the electric heating wire is the winding diameter, and the unit is meter; d2The winding outer diameter of the electric heating wire is meter; d is the diameter of the heating wire, and the unit is meter; rlThe resistance per meter of the electric heating wire is expressed in ohm; t is half of the sum of the stable temperature of the electric heating wire and the mud jacking temperature, and the unit is centigrade (DEG C); t isqIs the outdoor average air temperature in degrees Celsius (. degree. C.).
The derivation method for setting the heating wire loading voltage for the required temperature of the corrugated pipe 100 is as follows: according to the heat production power of the electric heating wire and the heat dissipation power of the concrete;
Figure 981485DEST_PATH_IMAGE004
Rithe heat transfer resistance of the inner surface is generally 0.11, and the unit is m2・K/W；ReThe heat transfer resistance of the outer surface is generally 0.04 in m2Planting seeds and seeds K/W; s is 1m3Surface area of concrete block in m2(ii) a T is 1m3Half of the sum of the stable temperature and the grouting temperature of the concrete block, wherein the unit is; t is a unit ofqThe unit is the outdoor average temperature;
the heat generated by the hydration of the concrete is negligible:
Figure 676909DEST_PATH_IMAGE005
wherein, U is the loading voltage of the electric heating wire, and the unit is V; t is 1m3Half of the sum of the stable temperature and the grouting temperature of the concrete block, wherein the unit is; t isqThe unit is the outdoor average temperature; r is the resistance of the electric heating element 2, and the unit is Ω.
The calculation method of the applied voltage of the heating wire provided in the present embodiment was used at 1m3The concrete block is a test piece, 1m3When the stable temperature of the concrete block is between 5 and 30 ℃, the loading voltage is between 40.25 and 50.2V, wherein the relation of the loading voltage along with the temperature change of the stabilized concrete is shown in figure 7, and under the condition that the grouting temperature and the ambient temperature are constant, the loading voltage and 1m3The stable temperature of the concrete block is in a nonlinear relation, and the loading voltage is 1m3The stable temperature of the concrete block is increased; wherein when the ambient temperature is between-15 deg.C and 5 deg.C, the loading voltage is about 40.25-13.42V, and the relation of loading voltage with construction ambient temperature is shown in FIG. 8, at grouting temperature and 1m3Under the condition that the stable temperature of the concrete block is constant, the loading voltage and the ambient temperature are in a nonlinear relation, and the loading voltage is reduced along with the increase of the ambient temperature.
The calculation method for setting the loading voltage of the heating wire according to the required temperature of the corrugated pipe 100 disclosed in this embodiment is to derive a relational formula between the loading voltage and the stable temperature of the corrugated pipe 100 through a concrete heat absorption and heating wire heat dissipation power balance equation. The formula can consider the atmospheric temperature, the grouting temperature, the length of the heating wire, the resistance of the heating wire, the size of the corrugated pipe 100 and the like, and the voltage value of the external power supply required by the corrugated pipe 100 to maintain a stable temperature meeting the construction requirement in the winter period is obtained through calculation. The embodiment can meet the requirement of the construction temperature of the prestressed pipeline in the winter period by adjusting the voltage of the external power supply of the heating wire, shortens the construction period and further reduces the cost.
In some embodiments, the grouting temperature control device includes a plurality of grouting temperature sensors and a first controller, wherein the grouting temperature sensors are disposed on the outer side of the outer pipe wall 12 and sequentially disposed along the extending direction of the corrugated pipe 100; the first controller adjusts the applied voltage of the bellows 100 by acquiring the monitoring data of the mud jacking temperature sensor. Specifically, as shown in fig. 2, a plurality of grouting temperature sensors are tightly attached to the outer side of the outer pipe wall 12 of the corrugated pipe 100 and uniformly arranged along the extending direction of the corrugated pipe 100, wherein the distance between adjacent grouting temperature sensors in practical production application is 20-60 cm, and the concrete box beam where the grouting temperature sensor is arranged is a monitoring point 700 on the grouting heat preservation device; the smaller the distance between the adjacent grouting temperature sensors is, the more accurate the temperature control is, the larger the distance is, and the lower the cost is. But the maximum distance is 60cm, the regulation and control of the first controller in the embodiment can be met, and the regulation and control of the temperature of the concrete box girder are realized.
In some embodiments, the segmental box girder insulation device comprises an electric heating furnace 800, an insulation cover provided with resistance wires, and an insulation steel template; the electric heater 800 is arranged inside a section box girder of the box girder bridge; the heat-insulating cover component and/or the heat-insulating steel formwork are arranged outside the section box girder.
As shown in fig. 1 in particular, the section box girder of the concrete box girder includes a top plate 200, a flange plate 300, a web 400, a bottom plate 500 and a receiving space enclosed by the top plate, the flange plate and the bottom plate; the section box girder heat preservation device in the embodiment comprises an electric heating furnace 800, a heat preservation cover piece provided with a resistance wire and a heat preservation steel template, wherein the electric heating furnace 800 is arranged in a section box girder of a box girder bridge; according to the heat preservation and supporting conditions of the section box girder, the top plate 200, the flange plate 300, the web 400 and the bottom plate 500 of the section box girder can be used in one or combination of the heat preservation cover piece and the heat preservation steel template, so that the omnibearing heat preservation of the section box girder is realized. The heat-insulating cover member can be understood as a cotton quilt with resistance wires, and the heat-insulating steel template is formed by arranging the resistance wires on the outer side of the steel template and spraying inorganic fiber heat-insulating cotton with the thickness of 6-8 cm. For example, the top plate 200 is insulated by using an insulating cover member, the upper surface of the top plate is covered by using an insulating cover member, the upper surface of the flange plate 300 is covered by using an insulating steel template, and the lower surface of the flange plate is insulated by using an insulating steel template; the heat preservation of the web 400 adopts a heat preservation steel template; the bottom plate 500 is insulated by adopting an insulation steel template; two ends of the segmental box girder are sealed for heat preservation, and an electric heating furnace 800 is arranged in the segmental box girder for heating.
In some embodiments, the temperature control device for the segment box girder comprises a plurality of temperature sensors and a second controller, wherein the temperature sensors are arranged in the top plate 200, the flange plate 300, the web 400, the bottom plate 500 and the box girder of the segment box girder in a fitting manner, and the distance between the adjacent temperature sensors is 20-60 cm; the second controller adjusts the output power of the segment box girder heat preservation device by acquiring monitoring data of the temperature sensor.
In some embodiments, a method for constructing a concrete box girder bridge in a cantilever in a winter period is further provided, which comprises the following steps:
s1, assembling the grouting heat-insulating system and the segment box girder heat-insulating system on the segment box girder of the box girder bridge; the first controller adjusts the loading voltage of the corrugated pipe 100 according to the temperature of a plurality of monitoring points 700 on the corrugated pipe 100 and the required temperature of the corrugated pipe 100, so as to adjust the heating power; voltage loading of bellows 100
Figure 449693DEST_PATH_IMAGE002
Wherein U is the loading voltage of the bellows 100, and the unit is V; l is the length of the electric heating wire, and the unit is meter; m is the number of turns of the electric heating wire wound on each layer, and the unit is a turn, n is the total number of turns, and the unit is a turn; k is the length of less than one circle, and the unit is meter; d1The inner diameter of the electric heating wire is the winding diameter, and the unit is meter; d2The winding outer diameter of the electric heating wire is meter; d is the diameter of the electric heating wire, and the unit is meter; rlThe resistance per meter of the electric heating wire is expressed in ohm; t is the stability of the heating wireHalf of the sum of the temperature and the grouting temperature, and the unit is; t is a unit ofqThe unit is the outdoor average temperature;
and S2, the temperature control device of the segment box girder adjusts the power of the electric heating furnace 800, the heat preservation cover piece and the heat preservation steel template by monitoring the temperature of a plurality of monitoring points on the heat preservation device of the segment box girder.
In some embodiments, the temperature control device of the segment box girder and the adjustment method of the first controller are both: when the temperature of any monitoring point 700 on the corrugated pipe 100 and any monitoring point on the segment box girder heat preservation device is less than 5 ℃, the first controller and the segment box girder temperature control device both improve the power of the corrugated pipe 100, the electric heater 800, the heat preservation cover part and the heat preservation steel template controlled by the first controller and the segment box girder temperature control device; when the temperature of any monitoring point 700 on the corrugated pipe 100 and any monitoring point on the segment box girder heat preservation device is not less than 5 ℃, judging whether the temperature difference between any monitoring point 700 on the corrugated pipe 100 and any monitoring point on the segment box girder heat preservation device and the construction environment is not less than 20 ℃; if not, the power of the corrugated pipe 100, the electric heating furnace 800, the heat preservation cover piece and the heat preservation steel template controlled by the electric heating furnace is kept; if so, the first controller reduces the power of the corrugated pipe 100, and the segment box girder temperature control device reduces the power of the segment box girder temperature control device near the monitoring point on the segment box girder heat preservation device.
As shown in fig. 9, when the temperature of the monitoring point 700 monitored by any one of the grouting temperature sensors is less than 5 ℃, the first controller increases the applied voltage of the corrugated pipe 100, thereby increasing the heating power of the corrugated pipe 100; when the temperature of the monitoring point 700 monitored by any grouting temperature sensor is greater than or equal to 5 ℃, the first controller judges whether the temperature difference between any monitoring point 700 and the construction environment is less than 20 ℃; when the temperature difference between any monitoring point 700 and the construction environment is less than 20, the heating power of the corrugated pipe 100 is kept; when the temperature difference between any one of the monitoring points 700 and the construction environment is greater than or equal to 20, the first controller needs to reduce the power of the corrugated pipe 100. Similarly, the section box girder temperature control device (second controller) controls the top plate 200, the flange plate 300, the web 400, the bottom plate 500 and the temperature sensors in the box of the section box girder, but compared with the first controller, the second controller can reduce the power of at least one of the electric heating furnace 800 near the monitoring point on the section box girder heat preservation device, the heat preservation cover provided with the resistance wire or the heat preservation steel template.
The concrete box girder segment construction method can ensure that the temperature of the concrete box girder segment and the temperature of the pipeline concrete are not lower than 5 ℃ and the temperature difference with the atmosphere is not more than 20 ℃ in the curing stage under the severe weather conditions of-20 ℃ of atmospheric temperature, strong wind, rain, snow and the like, can meet the construction requirement of the standard winter period, and can ensure the quality of the concrete.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Claims (10)

1. A concrete box girder bridge temperature control equipment containing a heating corrugated pipe is characterized by comprising:
the grouting heat insulation system comprises a grouting heat insulation device and a grouting temperature control device; the grouting temperature control device is used for monitoring the temperature of a plurality of monitoring points on the grouting heat insulation device and adjusting the heat insulation effect of the grouting heat insulation device; the grouting heat preservation device comprises a corrugated pipe, the corrugated pipe is used for grouting a prestressed pipeline and comprises a pipe body and an electric heating piece; the pipe body has a certain thickness, is hollow and consists of an inner pipe wall and an outer pipe wall, wherein a certain accommodating space is formed between the inner pipe wall and the outer pipe wall; the electric heating pieces are spirally wound outside the inner pipe wall and distributed in the accommodating space formed by the inner pipe wall and the outer pipe wall; the electric heating element is used for converting electric energy into heat energy and heating the slurry passing through the inner pipe wall; and
the section box girder heat preservation system comprises a section box girder heat preservation device and a section box girder temperature control device; the temperature control device of the segmental box girder is used for monitoring the temperatures of a plurality of monitoring points on the segmental box girder heat preservation device and adjusting the heat preservation effect of the segmental box girder heat preservation device.
2. The temperature control apparatus of claim 1, wherein the electrical heating elements are heating wires having diameters of 1/4-1/3 of the thickness of the tube; the lengths thereof all satisfy the following formula:
Figure 280285DEST_PATH_IMAGE001
wherein L is the length of the electric heating wire, and the unit is meter; m is the number of turns of each layer of the electric heating wire, and the unit is a turn, n is the total number of turns, and the unit is a turn; k is the length of less than one circle, and the unit is meter; d1The inner diameter of the electric heating wire is the winding inner diameter, and the unit is meter; d2The winding outer diameter of the electric heating wire is meter; d is the diameter of the electric heating wire in meters.
3. The temperature control apparatus according to claim 2, wherein the heating wire extends spirally along the axis of the pipe body and forms a first included angle of 77 ° to 83 ° with the axis of the pipe body, and a pitch of a spiral line formed by the heating wire is 30 mm to 60 mm.
4. The temperature control apparatus according to claim 2 or 3, wherein the heating wire includes a first heating wire and a second heating wire, wherein the first heating wire and the second heating wire each extend in a spiral shape in an axial direction of the pipe body and form a double spiral structure.
5. The temperature control apparatus of claim 3, wherein the outer tubular wall of the tubular body further comprises a threaded projection extending helically along the axial direction of the tubular body and forming a second included angle with the axial line of the tubular body; wherein the second included angle is equal to the first included angle; the wave pitch of a spiral line formed by the thread bulge is the same as that of a spiral line formed by the electric heating wire, and the electric heating wire is fixed in the thread bulge.
6. The temperature control apparatus of claim 5, further comprising a connection fitting disposed outside the outer tube wall for connecting adjacent lengths of the corrugated tubing.
7. The temperature control equipment of claim 3, wherein the grouting temperature control device comprises a plurality of grouting temperature sensors and a first controller, wherein the grouting temperature sensors are attached to the outer side of the outer pipe wall and are sequentially arranged along the extension direction of the corrugated pipe; the first controller adjusts the loading voltage of the corrugated pipe by acquiring monitoring data of the grouting temperature sensor.
8. The temperature control equipment of claim 1, wherein the section box girder thermal insulation device comprises an electric heating furnace, a thermal insulation cover member provided with resistance wires and a thermal insulation steel formwork; the electric heating furnace is arranged inside a section box girder of the box girder bridge; the heat-insulating cover piece and/or the heat-insulating steel formwork are arranged outside the section box girder.
9. A method for constructing a cantilever of a concrete box girder bridge in a winter period is characterized by comprising the following steps:
assembling the mud jacking system and the segmental box girder thermal insulation system in the temperature control equipment as claimed in any one of claims 2 to 8 on the segmental box girders of the box girder bridge;
the first controller adjusts the loading voltage of the corrugated pipe according to the temperature of a plurality of monitoring points on the corrugated pipe and in combination with the required temperature of the corrugated pipe, so as to adjust the heating power; the calculation method of the loading voltage of the corrugated pipe comprises the following steps:
Figure 480323DEST_PATH_IMAGE002
wherein U is the loading voltage of the corrugated pipe and the unit is V; l is the length of the electric heating wire, and the unit is meter; m is the number of turns of the electric heating wire wound on each layer, and the unit is a turn, n is the total number of turns, and the unit is a turn; k is the length of less than one circle, and the unit is meter; d1The inner diameter of the electric heating wire is the winding diameter, and the unit is meter; d2The winding outer diameter of the electric heating wire is meter; d is the diameter of the heating wire, and the unit is meter; rlThe resistance per meter of the electric heating wire is expressed in ohm; t is half of the sum of the stable temperature and the grouting temperature of the electric heating wire, and the unit is; t is a unit ofqThe unit is the outdoor average temperature;
the temperature control device of the section box girder adjusts the power of the electric heating furnace, the heat preservation cover component and the heat preservation steel template by monitoring the temperature of a plurality of monitoring points on the heat preservation device of the section box girder.
10. The method of claim 9, wherein the temperature control device of the segment box girder and the adjustment method of the first controller are both: when the temperature of any monitoring point is less than 5 ℃, the first controller and the temperature control device of the segmental box girder improve the power of the corrugated pipe, the electric heating furnace, the heat preservation cover piece and the heat preservation steel template controlled by the first controller and the temperature control device of the segmental box girder;
when the temperature of any monitoring point is not less than 5 ℃, judging whether the temperature difference between any monitoring point and the construction environment is not less than 20 ℃; if not, the power of the corrugated pipe, the electric heating furnace, the heat preservation cover piece and the heat preservation steel template is kept; if yes, the first controller reduces the power of the corrugated pipe, and the section box girder temperature control device reduces the power of the section box girder temperature control device near the monitoring point.
CN202210640937.XA 2022-06-08 2022-06-08 Concrete box girder bridge temperature control equipment containing heating corrugated pipe and construction method Pending CN114717972A (en)

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CN107059647A (en) * 2017-06-22 2017-08-18 中铁二十局集团第五工程有限公司 A kind of prestress pipe slip casting structure of controlling temperature and its temperature control method
CN206530786U (en) * 2016-12-09 2017-09-29 湖北飞歌科技有限公司 One kind reinforced winding bellowss of HDPE
CN210420892U (en) * 2019-08-14 2020-04-28 中铁十四局集团第三工程有限公司 Segment box girder winter construction is with heating heat preservation device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102092089A (en) * 2010-12-15 2011-06-15 中国建筑第二工程局有限公司 Heating wire heating device and construction method for winter concrete
US20150077740A1 (en) * 2011-11-01 2015-03-19 Empire Technology Development Llc Cable with optical fiber for prestressed concrete
CN105625179A (en) * 2014-10-29 2016-06-01 中铁十四局集团有限公司 Method for heating prestressed pipes through electric heating wires
CN205035737U (en) * 2015-06-19 2016-02-17 中铁六局集团天津铁路建设有限公司 Roof beam body slip casting pipe heating device
CN206530786U (en) * 2016-12-09 2017-09-29 湖北飞歌科技有限公司 One kind reinforced winding bellowss of HDPE
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