CN114164769B - Temporary support for bridge construction - Google Patents
Temporary support for bridge construction Download PDFInfo
- Publication number
- CN114164769B CN114164769B CN202111620570.7A CN202111620570A CN114164769B CN 114164769 B CN114164769 B CN 114164769B CN 202111620570 A CN202111620570 A CN 202111620570A CN 114164769 B CN114164769 B CN 114164769B
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- supporting structure
- fixed cylinder
- section supporting
- air bag
- temporary support
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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
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- 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
- H05B3/06—Heater elements structurally combined with coupling elements or holders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a temporary support for bridge construction, which comprises an upper section supporting structure and a lower section supporting structure, wherein the upper section supporting structure comprises a sulfur mortar layer and a heating device, and the heating device is used for heating the sulfur mortar layer; the upper end of the lower section supporting structure is connected with the bottom of the upper section supporting structure; the lower section supporting structure comprises a fixed cylinder, a piston is installed in the fixed cylinder, the top of the piston extends out of the upper portion of the fixed cylinder, a medium is filled between the bottom of the piston and the bottom of an inner cavity of the fixed cylinder, a medium discharge hole is formed in the side wall of the bottom of the fixed cylinder, and a plug corresponding to the medium discharge hole is arranged on the fixed cylinder. The invention takes the sulfur mortar layer which can be heated and melted as the upper section supporting structure, when the support is dismantled, the sulfur mortar layer is heated and melted, so that the total height of the temporary support is reduced until the end part of the beam slab slowly falls onto the pier cap cushion, the stable transition is completed, and the whole temporary support can be conveniently dismantled along with the failure of the sulfur mortar layer and the suspension of the lower section supporting structure without stress.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a temporary support for bridge construction.
Background
With the rapid development of high-grade highways in China, the quality requirements of bridges connected with highways are correspondingly improved, and the bridge construction technology is also very key. The current situation is as follows: for a high-grade highway bridge with a small span, the form of an assembled reinforced concrete slab beam is adopted; the bridge with medium span is in the form of assembled prestressed concrete T (box) beam; for a large-span prestressed concrete continuous beam bridge, the current construction method mainly adopts a balanced cantilever pouring method or an assembling method, but because the construction of cast-in-place continuous beams is complicated, tedious, labor-consuming and time-consuming, people always hope to combine the batch prefabrication production of simply supported beams and the superior performance of the continuous beams, and the method of realizing the batch prefabrication production of beams or plates to accelerate the construction of the continuous beams is the method of 'simply supporting first and then continuously constructing' which is commonly called by people.
At present, a sulfur mortar temporary support is often adopted in construction to realize 'simple support', and the principle is that an electric heating wire is arranged in the sulfur mortar in advance, and the temporary support is removed by melting the sulfur mortar through electric heating to complete system conversion. However, the construction of the temporary support of the sulfur mortar has the following disadvantages: because the resistance wire is easy to be damaged during construction or after the large-tonnage is pressed, the sulfur mortar melting speeds in the temporary supports on the two sides of the permanent support are different, so that the temporary supports on the two sides of the permanent support produce different displacements, the prefabricated box girder and the T girder can not uniformly fall on the permanent support, and the permanent support is damaged due to uneven stress, so that the construction quality is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a temporary support for bridge construction, which comprises the following components:
the upper-section supporting structure comprises a sulfur mortar layer and a heating device, and the heating device is used for heating the sulfur mortar layer;
the upper end of the lower section supporting structure is connected with the bottom of the upper section supporting structure; the lower section supporting structure comprises a fixed cylinder, a piston is installed in the fixed cylinder, the top of the piston extends out of the upper part of the fixed cylinder, a medium is filled between the bottom of the piston and the bottom of an inner cavity of the fixed cylinder, a medium discharge hole is formed in the side wall of the bottom of the fixed cylinder, and a plug corresponding to the medium discharge hole is arranged on the fixed cylinder; wherein the media discharge hole has a hole surface area larger than a maximum sectional area of the media.
In the application, the sulfur mortar only occupies one section of the temporary support used by the bridge, and compared with the prior art that the whole support is made of the sulfur mortar, the application reduces the influence caused by different melting speeds of the sulfur mortar of each support; when the temporary support is dismantled, the heating device is used for heating and melting the sulfur mortar layer, so that the total height of the temporary support is reduced until the end part of the beam slab slowly falls onto the pier cap pad to complete stable transition, and thus, along with the failure of the upper-section supporting structure, the upper part of the lower-section supporting structure is suspended without contacting the beam slab and is in an unstressed state, and the lower-section supporting structure can be conveniently dismantled; in addition, because the sulfur mortar of this application only is as upper segment supporting construction, be convenient for pouring construction and control pouring height, safer when demolising.
As optimization, upper segment supporting construction still includes slowly falls the structure, slowly fall the structure and include a plurality of crisscross slow descending boards that set up from top to bottom, each slowly falls one side of board and links to each other with one deck sulphur mortar layer respectively.
Like this, when the sulphur mortar layer of slowly falling board below melts, slowly fall the board and fall to the slowly falling board parallel and level with the next floor slowly to make the total height of support slowly descend, reach the effect of gentle transition.
As optimization, mounting grooves are formed in the top of each slow descending plate, and the heating devices are arranged in the mounting grooves; wherein a flame-retardant foam plate is installed on the side wall of the installation groove.
Like this, set up heating device in the mounting groove, reduce heating device's pressurized influence, avoid heating device to damage.
As optimization, the inner cavity of the mounting groove is of a vertically arranged strip-shaped structure; the heating device comprises a vacuum-pumping pipe body which is vertically arranged and a heater which is arranged on the lower side of the pipe body, and working liquid is filled in an inner cavity of the pipe body; the middle part of the pipe body is made of heat-insulating materials, and the upper part and the lower part of the pipe body are made of heat-conductive materials; when the heater does not heat the tube body, the liquid level of the working liquid is lower than the lowest part of the heat insulation part of the tube body.
Therefore, when the bottom of the pipe body is heated, the working liquid in the pipe body is heated and evaporated and takes away heat, the heat is latent heat of evaporation of the working liquid, the steam flows upwards to the top of the pipe body and is condensed into the working liquid, and meanwhile, the latent heat is released, so that the effect of transferring the heat from the bottom to the top of the pipe body is achieved, and the sulfur mortar above the pipe body is heated; after the steam at body top condenses into working fluid, working fluid has accomplished a closed circulation to the bottom of body under the effect of gravity, can pass to the top of body from the bottom of body with a large amount of heats like this repeatedly.
As optimization, the heater comprises an electric heating plate, an air bag, an extension tube, a lead and an electrifying switch; the electric heating plate is connected with the bottom of the tube body; the air bag is arranged at the lower side of the electric heating plate, and the gas generator is arranged in the air bag; the power-on switch is arranged on the lower side of the air bag; the telescopic end of the telescopic pipe is connected with the bottom of the electric heating plate, and the fixed end of the telescopic pipe is connected with the bottom of the mounting groove; one end of the lead is electrically connected with the power-on switch, and the other end of the lead penetrates through the inside of the telescopic pipe and is electrically connected with the electric heating plate;
when the air bag expands, the air bag can touch the power-on switch, so that the electric heating plate is powered on to heat.
Thus, when the temporary manufacturing needs to be dismantled, the gas generator in the air bag is detonated, so that the air bag is expanded; the upward expansion of the air bag can push the pipe body to move upwards for a certain distance, so that the top of the pipe body is closer to the sulfur mortar above the mounting groove, and the effect of heating and melting the sulfur mortar is better; the downward expansion of the air bag can touch and press the power-on switch, so that the electric heating plate is electrified and heated; this application only needs to detonate gas generator, when just can realizing the bottom of heating body, still makes the top of body more be close to the sulphur mortar.
Preferably, the plug is disc-shaped, the middle of the plug is connected with the fixed barrel through a rotating shaft, a plurality of through holes are formed in the plug, and the plug can rotate until the through holes coincide with the medium discharge holes.
Therefore, the opening and closing of the medium discharge hole can be controlled only by rotating the plug, and the device is simple in structure and easy to realize.
Preferably, a force application end extending along the radial direction of the plug is arranged on the outer side of the plug.
Therefore, the plug is convenient to rotate, and the opening and closing of the medium discharge hole are easier to control.
Preferably, the bottom wall of the medium outlet hole is inclined.
Thus, the discharge efficiency of the medium is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic cross-sectional view of a descent control plate according to the present invention;
fig. 3 is a schematic structural diagram of the plug of the present invention.
Reference numerals:
1-an upper section supporting structure, 11-a sulfur mortar layer, 12-a heating device, 121-a pipe body, 122-a heater, 1221-an electric hot plate, 1222-an air bag, 1223-an extension pipe, 1224-an electrified switch, 13-a slow descending structure and 130-a slow descending plate;
2-lower section supporting structure, 21-fixed cylinder, 22-piston, 23-plug, 231-force application end;
3-medium.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Example (b): as shown in fig. 1 to 3, a temporary bridge construction support includes an upper supporting structure 1 and a lower supporting structure 2.
The upper supporting structure 1 comprises a sulfur mortar layer 11 and a heating device 12, and the heating device 12 is used for heating the sulfur mortar layer 11. The upper end of the lower section supporting structure 2 is connected with the bottom of the upper section supporting structure 1. The lower-section supporting structure 2 comprises a fixed cylinder 21, a piston 22 is installed in the fixed cylinder 21, the top of the piston 22 extends out of the upper portion of the fixed cylinder 21, a medium 3 is filled between the bottom of the piston 22 and the bottom of an inner cavity of the fixed cylinder 21, a medium discharge hole is formed in the side wall of the bottom of the fixed cylinder 21, and a plug 23 corresponding to the medium discharge hole is arranged on the fixed cylinder 21. Wherein the area of the hole surface of the medium discharge hole is larger than the maximum sectional area of the medium 3.
In the application, the sulfur mortar only occupies one section of the temporary support used by the bridge, and compared with the prior art that the whole support is made of the sulfur mortar, the application reduces the influence caused by different melting speeds of the sulfur mortar of each support; when the temporary support is dismantled, the heating device is used for heating and melting the sulfur mortar layer, so that the total height of the temporary support is reduced until the end part of the beam slab slowly falls onto the pier cap pad to complete stable transition, and thus, along with the failure of the upper-section supporting structure, the upper part of the lower-section supporting structure is suspended without contacting the beam slab and is in an unstressed state, and the lower-section supporting structure can be conveniently dismantled; in addition, because the sulphur mortar of this application only is as upper segment supporting construction, be convenient for pour the construction and control the height of pouring, safer when demolising.
In practice, the medium 3 may be dry sand, which is easy to drain and visible anywhere in the field.
Specifically, upper segment supporting construction 1 still includes slowly falls structure 13, slowly fall structure 13 and include a plurality of crisscross slow descending board 130 that set up from top to bottom, and one side of each slow descending board 130 is connected with one deck sulphur mortar layer 11 respectively. Therefore, when the sulfur mortar layer below the slow descending plate is melted, the slow descending plate falls to be flush with the slow descending plate on the next layer, so that the total height of the support is slowly descended, and the effect of smooth transition is achieved.
Specifically, the top of the descent control plate 130 is provided with an installation groove, and the heating device 12 is disposed in the installation groove. In which a fire retardant foam board 14 is installed at the side wall of the installation groove. Like this, set up heating device in the mounting groove, reduce heating device's pressurized influence, avoid heating device to damage.
Specifically, the inner cavity of the mounting groove is of a vertically arranged strip-shaped structure; the heating device 12 includes a vacuum tube 121 vertically arranged and a heater 122 arranged on the lower side of the tube 121, and a working fluid is filled in the inner cavity of the tube 121; the middle of the pipe body 121 is made of a heat insulating material, and the upper and lower portions of the pipe body 121 are made of a heat conductive material. Like this, because the middle part of body adopts the heat-insulating material to make, it has played the separation effect, and the heat at body top can't be followed the self of body and transmitted the bottom of body, has realized the strict one-way heat conductivity of gravity heat pipe.
When the heater 122 does not heat the pipe body 121, the liquid level of the working fluid is lower than the lowest position of the heat insulation part of the pipe body 121.
Therefore, when the bottom of the pipe body is heated, the working liquid in the pipe body is heated and evaporated and takes away heat, the heat is latent heat of evaporation of the working liquid, the steam flows upwards to the top of the pipe body and is condensed into the working liquid, and meanwhile, the latent heat is released, so that the effect of transferring the heat from the bottom to the top of the pipe body is achieved, and the sulfur mortar above the pipe body is heated; after the steam at body top condenses into working fluid, working fluid has accomplished a closed cycle to the bottom of body under the effect of gravity, can pass to the top of body from the bottom of body with a large amount of heats like this repeatedly.
Specifically, the heater 122 includes an electric heating plate 1221, an air bag 1222, a bellows 1223, a wire, and an energizing switch 1224. The electric heating plate 1221 is connected to the bottom of the pipe body 121. It should be noted that, the specific structure of the electric heating plate is the prior art, and is not the content that this application needs to be protected, and the electric heating plate can be directly obtained through purchasing, and the specific structure of the electric heating plate is not repeated herein. The air bag 1222 is disposed under the electric heating plate 1221, and a gas generator is installed inside the air bag 1222. The power switch 1224 is disposed on the lower side of the air bag 1222. The telescopic end of the telescopic pipe 1223 is connected with the bottom of the electric heating plate 1221, and the fixed end of the telescopic pipe 1223 is connected with the bottom of the mounting groove; one end of the wire is electrically connected with the power-on switch 1224, and the other end of the wire passes through the interior of the telescopic tube 1223 and is electrically connected with the electric heating plate 1221; when the air bag 1222 is inflated, the air bag 1222 can touch the power switch 1224, so that the electric heating plate 1221 is heated by power. It should be noted that, in this application, no matter whether the gasbag expands or not, the top of body is located the mounting groove all the time.
In practice, a groove is also provided at the bottom of the mounting groove, and the power switch 1224 is installed in the groove. Therefore, when the air bag is expanded, the air bag does not contact the power-on switch, and when the air bag is expanded, the air bag is extruded into the groove and then contacts the power-on switch, so that the electric heating plate is powered on.
Thus, when the temporary manufacturing needs to be dismantled, the gas generator in the air bag is detonated, so that the air bag is expanded; the upward expansion of the air bag can push the pipe body to move upwards for a certain distance, so that the top of the pipe body is closer to the sulfur mortar above the mounting groove, and the effect of heating and melting the sulfur mortar is better; the downward expansion of the air bag can touch and press the power-on switch, so that the electric heating plate is electrified and heated; this application only needs to detonate gas generator, when just can realizing the bottom of heating body, still makes the top of body more be close to the sulphur mortar. In addition, the wire is installed in the telescopic tube, can protect the wire well, avoids the wire to receive the destruction.
Specifically, the plug 23 is disc-shaped, the middle of the plug 23 is connected to the fixed cylinder 21 through a rotating shaft, a plurality of through holes are formed in the plug 23, and the plug 23 can rotate until the through holes coincide with the medium discharge holes. Therefore, the opening and closing of the medium discharge hole can be controlled only by rotating the plug, and the device is simple in structure and easy to realize.
Specifically, the outer side of the plug 23 is provided with a force application end 231 extending along the radial direction of the plug 23. Therefore, the plug is convenient to rotate, and the opening and closing of the medium discharge hole are easier to control.
Specifically, the bottom wall of the medium discharge hole is inclined. Thus, the discharge efficiency of the medium is improved.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (6)
1. A temporary support for bridge construction, comprising:
the upper-section supporting structure comprises a sulfur mortar layer and a heating device, and the heating device is used for heating the sulfur mortar layer;
the upper end of the lower section supporting structure is connected with the bottom of the upper section supporting structure; the lower section supporting structure comprises a fixed cylinder, a piston is installed in the fixed cylinder, the top of the piston extends out of the upper part of the fixed cylinder, a medium is filled between the bottom of the piston and the bottom of an inner cavity of the fixed cylinder, a medium discharge hole is formed in the side wall of the bottom of the fixed cylinder, and a plug corresponding to the medium discharge hole is arranged on the fixed cylinder; wherein the media discharge orifice has an orifice surface area greater than the maximum cross-sectional area of the media;
the upper-section supporting structure further comprises a slow descending structure, the slow descending structure comprises a plurality of slow descending plates which are arranged in an up-and-down staggered mode, and one side of each slow descending plate is connected with one sulfur mortar layer;
mounting grooves are formed in the tops of the slow descending plates, and the heating devices are arranged in the mounting grooves; wherein a flame-retardant foam plate is installed on the side wall of the installation groove.
2. The temporary bridge construction support according to claim 1, wherein the inner cavity of the installation groove is of a vertically arranged strip structure; the heating device comprises a vacuum-pumping pipe body which is vertically arranged and a heater which is arranged on the lower side of the pipe body, and working liquid is filled in an inner cavity of the pipe body; the middle part of the pipe body is made of heat-insulating materials, and the upper part and the lower part of the pipe body are made of heat-conductive materials; when the heater does not heat the tube body, the liquid level of the working liquid is lower than the lowest part of the heat insulation part of the tube body.
3. The temporary support for bridge construction according to claim 2, wherein the heater comprises an electric heating plate, an air bag, an extension tube, a lead, and an energizing switch; the electric heating plate is connected with the bottom of the tube body; the air bag is arranged at the lower side of the electric heating plate, and a gas generator is arranged in the air bag; the power-on switch is arranged on the lower side of the air bag; the telescopic end of the telescopic pipe is connected with the bottom of the electric heating plate, and the fixed end of the telescopic pipe is connected with the bottom of the mounting groove; one end of the lead is electrically connected with the power-on switch, and the other end of the lead penetrates through the inside of the telescopic pipe and is electrically connected with the electric heating plate;
when the air bag expands, the air bag can touch the power-on switch, so that the electric heating plate is powered on and heated.
4. The temporary support for bridge construction according to claim 1, wherein the end cap has a disk shape, a central portion of the end cap is connected to the fixed cylinder by a rotation shaft, a plurality of through holes are formed in the end cap, and the end cap can rotate until the through holes coincide with the medium discharge holes.
5. The temporary support for bridge construction according to claim 4, wherein the outer side of the plug is provided with a force application end extending along the radial direction of the plug.
6. The temporary support for bridge construction according to claim 1, wherein the bottom wall of the medium discharge hole is inclined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111620570.7A CN114164769B (en) | 2021-12-28 | 2021-12-28 | Temporary support for bridge construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111620570.7A CN114164769B (en) | 2021-12-28 | 2021-12-28 | Temporary support for bridge construction |
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| CN114164769A CN114164769A (en) | 2022-03-11 |
| CN114164769B true CN114164769B (en) | 2023-04-14 |
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| CN114164769A (en) | 2022-03-11 |
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