CN111501520A - Pouring process for preventing concrete filled steel tube from being emptied - Google Patents
Pouring process for preventing concrete filled steel tube from being emptied Download PDFInfo
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- CN111501520A CN111501520A CN202010380211.8A CN202010380211A CN111501520A CN 111501520 A CN111501520 A CN 111501520A CN 202010380211 A CN202010380211 A CN 202010380211A CN 111501520 A CN111501520 A CN 111501520A
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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
- E01D4/00—Arch-type bridges
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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
Abstract
The invention discloses a pouring process for preventing concrete in a steel pipe from being emptied, which comprises the steps of heating the steel pipe to ensure that the steel pipe is thermally expanded, and pouring concrete into the steel pipe; and stopping heating after the concrete is poured, sealing the surface of the poured concrete, and enabling the steel pipe and the concrete to contract together and pinch the solidified concrete. According to the pouring process for preventing the concrete filled steel tube from being hollow, the steel tube is heated to be expanded and then the concrete is poured into the steel tube, so that the steel tube and the concrete shrink together after the pouring is finished and the heating is stopped, and therefore after the steel tube is cooled and the concrete is solidified, a hooped combined structure can be formed between the steel tube and the concrete in the construction stage, the steel tube and the concrete cannot be hollow thermally under the action of sunlight in the use stage, the service life of a concrete filled steel tube member is prolonged, and the application of a larger span of a concrete filled steel tube arch bridge can be realized.
Description
Technical Field
The invention belongs to the technical field of concrete filled steel tubes, and particularly relates to a pouring process for preventing concrete filled steel tubes from being emptied.
Background
In recent years, the concrete-filled steel tube is widely applied to bridges in China, particularly arch bridges, and the concrete-filled steel tube arch bridges are adopted in the design of a plurality of large-span bridges. The steel pipe concrete is a structural material with excellent performance, the mutual restriction of two materials of steel pipe and concrete in the stress process is utilized to fully exert respective advantages, namely, the concrete strength is improved by means of the hoop effect of the steel pipe on the core concrete, and simultaneously, the stability of the steel pipe wall is enhanced by means of the filled concrete. However, the premise of the steel pipe concrete is that the steel pipe and the concrete have enough shear bonding strength, and the steel pipe concrete and the concrete can work together. However, the problem of concrete filled steel tube emptying has limited the use and application of concrete filled steel tube arch bridges to larger spans.
To solve the problem of the void, various treatment measures have been provided so far. The method for preventing and controlling the concrete-filled steel tube from being hollow in the construction stage mainly comprises the modes of air exhaust, vibration, vault pre-pressing and the like. The anti-void method in the construction stage is subject to a large construction process relationship and large human factors, and only ensures that the steel pipe and the concrete can be well bonded together in the construction stage, but the shrinkage and creep of the concrete and the sensitivity of the steel pipe and the concrete affected by the temperature are different, and after the anti-void method is put into use, the steel pipe and the concrete still generate thermal void under the action of sunlight. The method for treating the existing steel pipe concrete arch bridge by means of void removal mainly comprises a secondary grouting method, a method for wrapping heat-insulating materials outside a pipe, a method for adding a lantern ring, a method for crossing bolts and the like. The treatment measures for the existing void concrete filled steel tube arch bridge are secondary pouring reinforcement, which is only a remedy measure, but the treatment measures have certain influence on the original structure, and the void still occurs when the treatment measures are put into use again.
In addition, there are other methods for solving the problem of void in the prior art, mainly including:
① installing high-strength expansion bolts at the debonding and debonding part, and pouring self-compacting compensation shrinkage concrete to form a reinforcing system, which can effectively solve the debonding and debonding between the steel pipe and the concrete, the reliable and effective connection between the new grouting slurry and the original structure concrete, the reliable and effective connection between the new grouting slurry and the steel pipe, and can monitor the detection and long-term monitoring of the reinforcing effect in real time or at regular intervals, and can quantitatively adjust the reinforcing effect at any time;
② anti-debonding structure, wherein the inner wall of the steel pipe is provided with a shear connector which is combined with the concrete, thereby avoiding debonding between the concrete and the steel pipe or reducing debonding degree, even after debonding occurs, the steel pipe and the concrete can still be connected, and force transmission is realized;
③ the inner wall of the steel pipe is provided with a plurality of longitudinal ribs and circumferential ribs, the longitudinal ribs are evenly distributed along the longitudinal direction of the steel pipe and are vertically fixed on the inner wall of the steel pipe, the annular ribs are transversely arranged, the periphery of the annular ribs is fixedly connected with the longitudinal ribs, and the problem that the steel pipe and the concrete are separated to a large extent due to the fact that the concrete is not tightly poured or due to the fact that the concrete shrinks and the temperature changes in the construction process is solved.
The methods all increase the difficulty of pouring the concrete in the steel tube, and the concrete in the steel tube can not be poured compactly.
Aiming at the defects, the invention provides a brand-new concrete filled steel tube anti-falling method,
disclosure of Invention
In view of the above, an object of the present invention is to provide a pouring process for preventing concrete filled steel tube from coming loose, which can form a tightened combination structure of a steel tube and concrete in a construction stage, and prevent the steel tube and the concrete from coming loose thermally under the action of sunlight in a use stage, thereby prolonging the service life of a concrete filled steel tube member and enabling a concrete filled steel tube arch bridge to be applied in a larger span.
In order to achieve the purpose, the invention provides the following technical scheme:
a pouring process for preventing concrete in a steel pipe from falling off is characterized in that the steel pipe is heated to cause thermal expansion of the steel pipe, and then concrete is poured into the steel pipe; and stopping heating after the concrete is poured, sealing the surface of the poured concrete, and enabling the steel pipe and the concrete to contract together and pinch the solidified concrete.
Further, the shrinkage deformation of the inner diameter of the steel pipe after the heating is stopped is more than or equal to the shrinkage deformation of the concrete in the solidification process; the ratio of the shrinkage rate of the inner diameter of the steel pipe after the heating is stopped to the shrinkage rate of the concrete in the solidification process is 1.05-1.12.
Further, an electric eddy current heating device is adopted to heat the steel pipe.
Further, the eddy current heating apparatus includes:
the spiral coil is sleeved outside the steel pipe;
a low frequency alternating power supply for providing power to the helical coil;
the frequency modulation device is arranged between the low-frequency alternating power supply and the spiral coil and is used for adjusting the current frequency of the spiral coil so as to control the heating speed of the steel pipe;
and the temperature feedback and current intensity feedback device is used for controlling the output current intensity of the low-frequency alternating power supply so as to keep the heating temperature of the steel pipe within a set range.
Further, the temperature feedback and current intensity feedback device comprises a control circuit, a temperature control chip, an infrared temperature control sensor for detecting the temperature of the steel pipe in real time and a potential regulator for regulating the output potential of the low-frequency alternating power supply, wherein the infrared temperature control sensor and the temperature control chip are electrically connected with the control circuit, and the potential regulator is electrically connected with the temperature control chip.
Further, the concrete filled steel tube is produced by adopting a sectional pouring mode, and the eddy current heating device heats the steel tube in sections.
And further, recovering heat emitted by the eddy current heating device by using a phase change energy storage device and carrying out heat preservation and maintenance on the concrete-filled steel tube.
Further, the phase change energy storage device comprises a phase change energy storage heat preservation device sleeved on a rear adjacent section which is adjacent to the steel pipe heating section and is filled with concrete and a heat exchange device sleeved on a front adjacent section which is adjacent to the steel pipe heating section and is not filled with concrete; the phase change energy storage heat preservation device comprises a heat transfer inner layer sleeved on the steel pipe and a heat preservation outer layer arranged outside the heat transfer inner layer, a heat storage cavity used for storing a phase change energy storage medium is arranged between the heat transfer inner layer and the heat preservation outer layer, and a heat exchange pipeline communicated with the heat exchange device is arranged in the heat storage cavity.
Further, the next section of steel pipe concrete is poured after the previous section of steel pipe concrete is poured, at the moment, the eddy current heating device moves forwards to the adjacent section in the front when the previous section of steel pipe concrete is poured, the heat exchange device and the eddy current heating device move forwards synchronously, the phase change energy storage and heat insulation device is additionally arranged on the previous section of poured steel pipe concrete, and the heat exchange device is communicated with a heat exchange pipeline of the phase change energy storage and heat insulation device which is additionally arranged.
Further, the heat transfer inner layer is made of metal copper, and the phase change energy storage medium is made of paraffin.
The invention has the beneficial effects that:
according to the pouring process for preventing the concrete filled steel tube from being hollow, the steel tube is heated to be expanded and then the concrete is poured into the steel tube, so that the steel tube and the concrete shrink together after the pouring is finished and the heating is stopped, and therefore after the steel tube is cooled and the concrete is solidified, a hooped combined structure can be formed between the steel tube and the concrete in the construction stage, the steel tube and the concrete cannot be hollow thermally under the action of sunlight in the use stage, the service life of a concrete filled steel tube member is prolonged, and the application of a larger span of a concrete filled steel tube arch bridge can be realized.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a schematic diagram of an eddy current heating apparatus suitable for use in an embodiment of the present invention of a pouring process for preventing concrete filled steel tube from being emptied;
FIG. 2 is a schematic diagram of an eddy current heating apparatus;
FIG. 3 is a diagram of a state of use of the concrete filled steel tube produced by the sectional pouring method, specifically, a schematic structural diagram of the concrete filled steel tube in the previous section;
FIG. 4 is a diagram of a state of use of the concrete filled steel tube produced by the sectional pouring method, specifically, a schematic structural diagram of the next section of concrete poured;
fig. 5 is detail a of fig. 4.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
In the pouring process for preventing the concrete-filled steel tube from being emptied, the steel tube is heated to thermally expand the steel tube, and then concrete is poured into the steel tube; and stopping heating after the concrete is poured, sealing the surface of the poured concrete, and enabling the steel pipe and the concrete to contract together and pinch the solidified concrete. Namely, the steel pipe shrinks along with the concrete along with the temperature reduction, the bonding force between the steel pipe and the concrete is enhanced, the hoop effect is stronger, and more concrete is poured.
Specifically, the shrinkage deformation amount of the inner diameter of the steel pipe after the heating is stopped is more than or equal to the shrinkage deformation amount of the concrete in the solidification process. The heat conductivity of the steel pipe is superior to that of concrete, namely the temperature reduction range of the steel pipe after the heating is stopped is far higher than that of the concrete, the temperature shrinkage deformation amount of the steel pipe after the heating is stopped is obviously larger than that of the concrete, and the concrete in the steel pipe is densely filled by utilizing the shrinkage deformation difference. Because the linear expansion coefficient of the steel is larger than that of the concrete, the shrinkage deformation of the steel is larger than that of the concrete under the condition of the same temperature difference, so that the ratio of the shrinkage rate of the inner diameter of the steel pipe after the heating is stopped to the shrinkage rate of the concrete in the solidification process is 1.05-1.12, and the steel pipe plays a role of a hoop on the concrete.
Further, in this embodiment, an electric eddy current heating device is used to heat the steel pipe. The eddy current heating apparatus of the present embodiment includes:
and the spiral coil 2 is sleeved outside the steel pipe 1. The spiral coil 2 is also provided with a shell 3.
A low frequency alternating power supply 4 for supplying power to the helical coil 2; the eddy current heating apparatus of the present embodiment further includes an external switch 5 for controlling the on/off of the low frequency alternating current power supply 4.
And the frequency modulation device 6 is arranged between the low-frequency alternating power supply 4 and the spiral coil 2 and is used for adjusting the current frequency of the spiral coil 2 so as to control the heating speed of the steel pipe 1. As shown in fig. 2, the frequency modulation apparatus 6 of the present embodiment includes a rectification frequency conversion module and a filter circuit, which will not be described in detail.
And the temperature feedback and current intensity feedback device 7 is used for controlling the output current intensity of the low-frequency alternating power supply 4 so as to keep the heating temperature of the steel pipe 1 within a set range. The temperature feedback and current intensity feedback device 7 of this embodiment includes control circuit 8, temperature control chip 9, is used for the infrared temperature control sensor 10 of the 1 temperature of real-time detection steel pipe and is used for adjusting the potentiometric regulators 11,12 of the output potential of low frequency alternating power supply 4, infrared temperature control sensor 10 and temperature control chip 9 all with control circuit 8 electricity is connected, potentiometric regulator 11,12 with temperature control chip 9 electricity is connected.
When the infrared temperature control sensor 10 detects that the temperature of the steel pipe 1 is higher than the set maximum value, the control circuit 8 controls the low-frequency alternating power supply 4 to reduce the output potential through the temperature control chip 9 and the potential regulators 11 and 12, so that the current intensity of the spiral coil 2 is reduced, and the temperature of the steel pipe 1 returns to the set range. Similarly, when the infrared temperature control sensor 10 detects that the temperature of the steel pipe 1 is lower than the set minimum value, the control circuit 8 controls the low-frequency alternating power supply 4 to increase the output potential through the temperature control chip 9 and the potential regulators 11 and 12, so as to increase the current intensity of the spiral coil 2 and return the temperature of the steel pipe 1 to the set range. Of course, the control circuit 8 may also be connected with a display for displaying information such as the temperature of the steel pipe 1, the output voltage of the low-frequency alternating power supply 4, the current intensity of the spiral coil 2 and the like in real time.
Further, when the length of the steel pipe 1 is long or required by construction, the steel pipe concrete can be produced by adopting a sectional pouring mode, and the eddy current heating device heats the steel pipe in sections. When the subsection is poured, the phase change energy storage device can be used for recovering the heat emitted by the eddy current heating device and carrying out heat preservation and maintenance on the steel pipe concrete. Specifically, the phase change energy storage device comprises a phase change energy storage heat preservation device 13 sleeved on a rear adjacent section 1b which is adjacent to the steel pipe heating section 1a and is filled with concrete 19, and a heat exchange device 14 sleeved on a front adjacent section 1c which is adjacent to the steel pipe heating section 1a and is not filled with concrete; specifically, the phase change energy storage heat preservation device of this embodiment includes heat transfer inner 15 and the heat preservation outer 16 of setting outside heat transfer inner 15 of suit on steel pipe 1, be equipped with the heat-retaining cavity 17 that is used for storing phase change energy storage medium between heat transfer inner 15 and the heat preservation outer 16, be equipped with in the heat-retaining cavity 17 with heat exchange device 14 is linked together's heat transfer pipeline 18. Therefore, the heat transferred to the front adjacent section 1c in the heating process of the eddy current heating device is transferred to the phase change energy storage heat preservation device 13 after being subjected to heat exchange by the heat exchange device 14, so that the phase change energy storage medium generates phase change energy storage. The heat transferred to the rear adjacent section 1b in the heating process of the eddy current heating device is directly transferred to the heat storage cavity 17 through the heat transfer inner layer 15 to heat the phase change energy storage medium, so that the phase change energy storage medium generates phase change energy storage.
Further, the next section of steel pipe concrete is poured after the previous section of steel pipe concrete is poured, the current vortex heating device moves forward to the adjacent section before when the previous section of steel pipe concrete is poured, the heat exchange device 14 and the current vortex heating device move forward synchronously, the phase change energy storage and heat insulation device 15 is additionally arranged on the previous section of steel pipe concrete which is poured, and the heat exchange device is communicated with the heat exchange pipeline of the phase change energy storage and heat insulation device which is additionally arranged. As shown in fig. 3 and 4, after the whole steel pipe 1 is filled with concrete, the steel pipe 1 is sleeved with the phase change energy storage heat preservation device 13, so that the heat preservation and maintenance of the concrete in the steel pipe 1 are realized.
Preferably, the heat transfer inner layer 13 is made of copper metal and has excellent heat conduction performance. The phase change energy storage medium adopts paraffin, and in the concrete pouring process, the heat emitted by the eddy current heating device can melt the paraffin, and at the night when the ambient temperature is lower or the temperature difference between day and night is larger, the paraffin is released in the solidification process, so that the purpose of heat preservation and maintenance of the concrete filled steel tube is achieved.
The principle of the phase change energy storage device of the embodiment is as follows: since the hydration heat temperature of the initial stage of concrete filled steel tube pouring is about 70 ℃, the phase transition temperature of the paraffin is adjusted by adjusting the component composition of the paraffin in the embodimenttIs 30-45 DEG CI.e. paraffin temperature above the phase transition temperaturetAbsorbs heat and stores energy when the temperature is lower thantWill release heat, phase transition temperaturetThe specific numerical value of the concrete is comprehensively determined according to the air temperature during concrete pouring, and the determination principle is that the phase change temperature is slightly higher than the air temperature during concrete pouring.
The heat exchange device 14 and the phase change energy storage heat preservation device 13 have the effect of directionally transferring heat, and most of heat energy at the heat exchange device 14 needs to be transferred to a heat exchange medium instead of a steel pipe; for the phase-change energy-storage heat-preservation device 13, the proper phase-change temperature can be determined by adjusting the components of the phase-change material paraffin, the phase-change material paraffin is in a heat-preservation working condition when the outside air temperature is lower, heat is released to the concrete filled steel tube at the moment, the phase-change material paraffin is in an energy-storage working condition when the outside air temperature is higher, the paraffin continuously absorbs the heat to carry out phase change, and the heat absorption temperature is not increased. The phase transition temperature of the paraffin wax of this example was set to 35 ℃ to 45 ℃.
If the temperature of the heat exchange device 14 is higher than the phase transition temperature of the paraffintThen, the temperature of the heat exchange medium after the heat exchange of the heat exchange device 14 is higher than the phase transition temperature of the paraffintThe heat exchange medium circulates to the phase-change energy-storage heat-preservation device 13 at the lower end, and the temperature in the phase-change energy-storage heat-preservation device 13 is maintained at the phase-change temperature of the paraffin due to the action of the paraffintAt the moment, a temperature gradient exists between the heat exchange medium and the paraffin, heat is released to the paraffin and is cooled to the phase change temperature of the paraffintAnd then when the heat exchange medium is recycled to the heat exchange device 14, if the temperature at the heat exchange device 14 is higher than the phase transition temperature of the paraffin waxtThe heat exchange medium is heated, and the temperature in the heat exchange device 14 and the temperature in the phase-change energy-storage heat-preservation device 13 can be maintained at the paraffin phase-change temperature through the circulationtThis state.
The pouring process for preventing concrete filled steel tube from being emptied of the embodiment comprises the steps of heating a steel tube, pouring concrete into the steel tube after expansion of the steel tube, pouring, finishing and stopping heating, shrinking the steel tube and the concrete together, cooling the steel tube, solidifying the concrete, enabling the steel tube and the concrete to form a hooped combined structure in a construction stage, enabling the steel tube and the concrete to be under the sunshine effect in a use stage, avoiding heat emptying of the steel tube and the concrete, prolonging the service life of a concrete filled steel tube member, and enabling the concrete filled steel tube arch bridge to be capable of achieving application in a larger span.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A pouring process for preventing concrete filled steel tube from being emptied is characterized in that: heating the steel pipe to make the steel pipe thermally expand, and then pouring concrete into the steel pipe; and stopping heating after the concrete is poured, sealing the surface of the poured concrete, and enabling the steel pipe and the concrete to contract together and pinch the solidified concrete.
2. The pouring process for preventing concrete filled steel tube from being emptied according to claim 1, wherein: the shrinkage deformation of the inner diameter of the steel pipe after the heating is stopped is more than or equal to that of the concrete in the solidification process; the ratio of the shrinkage rate of the inner diameter of the steel pipe after the heating is stopped to the shrinkage rate of the concrete in the solidification process is 1.05-1.12.
3. The pouring process for preventing concrete filled steel tube from coming to nothing according to claim 1 or 2, characterized in that: and heating the steel pipe by adopting an electric eddy current heating device.
4. The pouring process for preventing concrete filled steel tube from being emptied according to claim 3, wherein: the eddy current heating apparatus includes:
the spiral coil is sleeved outside the steel pipe;
a low frequency alternating power supply for providing power to the helical coil;
the frequency modulation device is arranged between the low-frequency alternating power supply and the spiral coil and is used for adjusting the current frequency of the spiral coil so as to control the heating speed of the steel pipe;
and the temperature feedback and current intensity feedback device is used for controlling the output current intensity of the low-frequency alternating power supply so as to keep the heating temperature of the steel pipe within a set range.
5. The pouring process for preventing concrete filled steel tube from being emptied according to claim 4, wherein: the temperature feedback and current intensity feedback device comprises a control circuit, a temperature control chip, an infrared temperature control sensor and a potential regulator, wherein the infrared temperature control sensor is used for detecting the temperature of the steel pipe in real time, the potential regulator is used for regulating the output potential of the low-frequency alternating power supply, the infrared temperature control sensor and the temperature control chip are electrically connected with the control circuit, and the potential regulator is electrically connected with the temperature control chip.
6. The pouring process for preventing concrete filled steel tube from being emptied according to claim 3, wherein: the concrete filled steel tube is produced by adopting a sectional pouring mode, and the eddy current heating device heats the steel tube in sections.
7. The pouring process for preventing concrete filled steel tube from being emptied according to claim 6, wherein: and recovering heat emitted by the eddy current heating device by using the phase change energy storage device and carrying out heat preservation and maintenance on the concrete filled steel tube.
8. The pouring process for preventing concrete filled steel tube from being emptied according to claim 7, wherein: the phase change energy storage device comprises a phase change energy storage heat preservation device sleeved on a rear adjacent section which is adjacent to the steel pipe heating section and is filled with concrete and a heat exchange device sleeved on a front adjacent section which is adjacent to the steel pipe heating section and is not filled with concrete; the phase change energy storage heat preservation device comprises a heat transfer inner layer sleeved on the steel pipe and a heat preservation outer layer arranged outside the heat transfer inner layer, a heat storage cavity used for storing a phase change energy storage medium is arranged between the heat transfer inner layer and the heat preservation outer layer, and a heat exchange pipeline communicated with the heat exchange device is arranged in the heat storage cavity.
9. The pouring process for preventing concrete filled steel tube from being emptied according to claim 8, wherein: and after the previous section of steel pipe concrete is filled, the next section of steel pipe concrete is filled, at the moment, the eddy current heating device moves forwards to the adjacent section before the previous section of steel pipe concrete is filled, the heat exchange device and the eddy current heating device move forwards synchronously, the phase change energy storage and heat insulation device is additionally arranged on the previous section of filled steel pipe concrete, and the heat exchange device is communicated with the heat exchange pipeline of the phase change energy storage and heat insulation device additionally arranged.
10. The pouring process for preventing concrete filled steel tube from being emptied according to claim 8, wherein: the heat transfer inner layer is made of metal copper, and the phase change energy storage medium is made of paraffin.
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