CN113062225B - Temporary supporting device and method for improving stability of mounting and positioning precision of T-shaped beam - Google Patents
Temporary supporting device and method for improving stability of mounting and positioning precision of T-shaped beam Download PDFInfo
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- CN113062225B CN113062225B CN202110342034.9A CN202110342034A CN113062225B CN 113062225 B CN113062225 B CN 113062225B CN 202110342034 A CN202110342034 A CN 202110342034A CN 113062225 B CN113062225 B CN 113062225B
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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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- 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
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Abstract
The invention discloses a temporary supporting device and a temporary supporting method for improving the stability of T-beam mounting and positioning precision, wherein the temporary supporting device comprises a base, a T-beam positioning device and a temporary support; the T-beam positioning device comprises a first positioning device, a second positioning device and a third positioning device; the first positioning device is positioned at one end of the base and comprises a hydraulic lifting platform which is telescopic up and down and a boosting jack which moves in the horizontal direction, and the boosting jack is connected with the boosting plate; the second positioning device comprises a telescopic lateral supporting rod; the third positioning device is positioned at the other end of the base and comprises a guide plate, and the guide plate is movable and supported by a support rod; the temporary support is positioned in the middle of the base and comprises a lower bearing structure and an upper structure; two limiting blocks are vertically arranged at the top of the lower bearing structure, a gap is reserved between the two limiting blocks, a mounting hole is formed in each limiting block body, the upper structure is inserted into the gap and the mounting hole, and a hydraulic jack is arranged inside the upper structure.
Description
Technical Field
The invention relates to the technical field of prefabricated T-shaped beam installation construction in an assembly type bridge construction technology, in particular to a temporary supporting device and a temporary supporting method which can improve the installation accuracy and stability of a prefabricated T-shaped beam and are convenient to disassemble.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the rapid development of road traffic, bridges are more and more widely applied, accordingly, the level of bridge construction in China is increasingly improved, and large span and high quality are also key points of bridge construction. The simply supported and continuous bridge is a bridge form widely applied in China, namely, a beam body is prefabricated in a prefabricated yard in a centralized mode and then erected on site, so that the construction progress can be effectively accelerated, the labor efficiency is improved, formwork supports and mechanical equipment are saved, and the construction cost is reduced. Generally, the key of the construction of a simply supported and then continuous bridge lies in system conversion, so that the key point of ensuring the bridge construction is to effectively improve the construction quality of the system conversion.
In a simple-support-to-continuous bridge, a concrete prefabricated T beam is a bridge superstructure which is widely applied, the prefabricated T beam is usually manufactured, tensioned and the like in a standard prefabricated field, and then is conveyed to a bridge site through a gun carriage to be installed on the site through a bridge girder erection machine and a crane, so that the key for improving the construction quality of the T beam during installation and installation is whether system conversion is successful or not. The main problem when a general T beam is erected is the positioning precision and stability of the prefabricated T beam installation, and the T beam installation precision is insufficient, so that the central line of the T beam cannot be aligned, and a wet joint part is easy to crack during tensioning, and the bridge is seriously damaged. Meanwhile, the problem of stability after the T-shaped beam is installed is a difficult problem which cannot be ignored, and the key of construction is to ensure the anti-overturning of the T-shaped beam because the area of the acting part is smaller after the T-shaped beam is installed.
The simple support changes continuous bridge and need adopt interim support bearing structure to the T roof beam of installation usually when the T roof beam is erected the installation, and in present engineering construction, highway T roof beam installation construction quality requirement is higher, requires when installing the T roof beam temporarily, and interim support does not have the deformation to can conveniently dismantle, the operation of being convenient for, thereby improve the efficiency of construction. At present, the temporary support in the large-span and mid-span bridges is widely applied and mainly comprises a sulfur mortar temporary support and a steel cylinder sand box temporary support.
The working principle of the temporary support for the sulfur mortar is that a resistance wire is embedded in the sulfur mortar in advance, the temporary support for the bridge is detached by melting the sulfur mortar through electric heating to complete system conversion, the main defect of the temporary support is that the surface of the temporary support for the sulfur mortar is cracked frequently in the cooling and curing process, the support is easy to break, the resistance wire is easy to break or is electrified to break, the synchronism of system conversion cannot be achieved, meanwhile, the manufacturing process requirement of the temporary support for the sulfur mortar is high, and once the beam falls, the elevation is difficult to adjust.
The working principle of the temporary support of the steel cylinder sand box is that dry fine sand is poured into a steel closed container, and the size of the fine sand in the container is reduced by opening the bottom or the side part of the steel closed container to finish the removal of the temporary support. The temporary support has the main defects that the support process is complex, the sand barrel settlement test is complex, the overall precision is not high, sand leakage easily occurs to cause uneven bearing stress, sand is affected with damp to cause difficulty in disassembly, manual operation is needed in the whole process, and the construction difficulty is very high particularly when high-altitude bridges are built.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a temporary support device and a temporary support method for improving the stability of the mounting and positioning precision of a T-shaped beam, and mainly aims to solve the problems of positioning precision and stability in the T-shaped beam mounting process, and provides a temporary support device which can improve the mounting and positioning precision of a prefabricated T-shaped beam, is stable after mounting, and is convenient to detach, stable and reliable.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a temporary supporting device for improving the stability of T-beam mounting and positioning accuracy, including a base, a T-beam positioning device, and a temporary support;
the T-beam positioning device comprises a first positioning device, a second positioning device and a third positioning device;
the first positioning device is positioned at one end of the base and comprises a hydraulic lifting platform, the hydraulic lifting platform is arranged on the base and can stretch up and down, a boosting jack is arranged on the hydraulic lifting platform and is connected with a boosting plate, and the boosting plate is pushed to move in the horizontal direction by the boosting jack;
the second positioning device comprises four telescopic lateral supporting rods, and the four telescopic lateral supporting rods are positioned at four corners of the base; the telescopic lateral supporting rods on the left side and the right side are symmetrically arranged; the four telescopic lateral supporting rods can stretch out and draw back towards the middle position of the base.
The third positioning device is positioned at the other end of the base and comprises a guide plate, the guide plate is positioned close to the right end of the base, the bottom of the guide plate is arranged on the guide rail, the right side of the guide plate is supported by a support rod, one end of the support rod is hinged with the base, and the other end of the support rod is connected with the guide plate;
the temporary support comprises a lower bearing structure and an upper structure; two limiting blocks are vertically arranged at the top of the lower part bearing structure, a gap is reserved between the two limiting blocks, a mounting hole is formed in each limiting block body, and the upper structure is fixed in the gap and the mounting hole and internally provided with a hydraulic jack.
As a further technical scheme, the upper structure comprises a rubber pad steel plate combination plate, an upper limiting ridge and an upper bearing block, the upper bearing block is a rectangular block, the rubber pad steel plate combination plate 18 is fixed at the top of the upper bearing block, the upper limiting ridge is fixed on two sides of the upper bearing block, and the upper limiting ridge is triangular.
As a further technical scheme, two ends of the upper limiting edge extend into the limiting blocks on two sides in the length direction to limit the upper structure.
As a further technical scheme, the upper bearing block is installed in the gap, and two ends of the upper bearing block are fixed through an embedding block respectively.
As a further technical scheme, the position of the upper limiting edge is fixed through an embedded block and a limiting block which are embedded into the mounting hole.
As a further technical scheme, the base can be fixed on the cover beam of the pre-installed T-shaped beam through a bolt hole reserved in the base. The T-beam positioning device is fixed on two sides of the upper portion of the base 6, the temporary support is fixed in the middle of the upper portion of the base and located under the prefabricated T-beam to be installed.
Further, the base comprises a horizontal part and two side parts, the two side parts extend upwards along two ends of the horizontal part, and the two side parts are perpendicular to the horizontal part;
furthermore, the temporary support is arranged on a sand box, sand is contained in the sand box, the temporary support is arranged on the sand, and the lower bearing structure of the temporary support is connected with the sand box through four reinforcing plates for reinforcement. The height of the temporary support is changed by changing the volume of sand in the sand box at the bottom of the temporary support.
Furthermore, the guide plate is arranged between the two guide rails and driven by a driving device, and the driving device drives the guide plate to move along the two guide rails.
In a second aspect, the embodiment of the present invention further provides a method for supporting by using the temporary supporting device for improving the stability of the mounting and positioning accuracy of the T-beam;
firstly, the position of a temporary support on a cover beam is predetermined, the position of a base is adjusted, the alignment of the center line of the base and the center line of a permanent support is the check completion, and the base can be fixed through four reserved bolt holes on the base after the adjustment is completed;
the size of a horseshoe part at the bottom of a T-shaped beam to be installed is predetermined, and a guide plate 1 of the device can be adjusted to a corresponding position through remote control;
the height of the temporary support is calculated in advance, the height of the temporary support is changed by changing the volume of sand in a sand box at the bottom of the temporary support, and fine sand in the sand box is smoothed and compacted;
and setting the temporary support to be in a loaded state, namely putting the four embedding blocks at the bottom into corresponding positions, and adjusting the internal hydraulic jack to be in an initial state.
Placing the temporary support on the sand box with the adjusted height, wherein the reinforcing plates on the four sides are respectively embedded into the corresponding clamping grooves, and the four reinforcing plates are respectively positioned on the four sides of the bottom of the temporary support;
after the height adjustment of the temporary support is finished and the temporary support is checked, the T beam to be installed is conveyed to the top of the device by a bridge girder erection machine, the T beam is approximately aligned with the central line of the device, the T beam is slowly lowered by the bridge girder erection machine and is close to the upper part of the guide plate 1 to be continuously lowered, the T beam horseshoe is close to the top end of the temporary support along the guide plate 1, the height of the hydraulic lifting platform is controlled by remote control, the top of the hydraulic lifting platform is approximately 20 centimeters higher than the bottom of the T beam, the boosting jack is started, the boosting plate is slowly close to the T beam horseshoe until the T beam horseshoe is attached, pressurization is continuously carried out, the other side of the T beam horseshoe is attached to the guide plate, the T beam is continuously lowered by the bridge girder erection machine, and the T beam falls on the top plate of the temporary support.
After the T-beam falls on the temporary support, the telescopic lateral support rods 4 at the four corners of the base 6 are lifted and extended to be fixed at the junction of the top plate of the web plate of the T-beam, and the lateral support is completed.
And (3) starting the conversion of the bridge simple support conversion continuous system, entering a temporary support dismantling step, firstly putting down four telescopic lateral support rods, then moving the guide plate to the right, unloading the boosting jack, and moving the boosting plate to the left to separate the boosting plate from the T-shaped beam.
The embedded blocks on the four sides are detached through pulling handles of the embedded blocks on the base, the limiting blocks naturally fall down to form smooth slopes with the limiting grooves, the jack in the upper structure of the temporary support is opened, and the bottom of the jack is fixed with the upper structure of the temporary support, so that the top plate of the temporary support is separated from the bottom of the T-shaped beam.
And (4) removing four bolts between the base and the cover beam, taking the device down from the cover beam, and finishing the removal of the temporary support, so that the system is successfully converted.
The embodiment of the invention has the following beneficial effects:
the base of the invention has larger size, a plurality of bolts can be placed at the bottom of the base to be connected with the top of the bent cap, and the stability of the whole structure is better.
The whole material of the invention adopts high-strength steel, has large integral rigidity and is not easy to deform in the using process.
The T-beam positioning device provided by the invention has the advantages that the guide plate is matched with the boosting device, the efficiency is high, the reliability is good, the position of the guide plate can be adjusted through the guide rail on the base, the T-beam positioning device is suitable for different construction and installation requirements of prefabricated T-beams with different sizes, and the positioning precision and the stability during T-beam installation can be effectively improved.
The temporary support top plate is formed by combining the rubber cushion pad and the steel plate, the rubber cushion pad is positioned above the steel plate and is in direct contact with the T beam, the T beam can be effectively protected, and the T beam is prevented from being damaged in the installation process.
The side edge of the positioning device is provided with the support rod device, so that the T-shaped beam can be effectively supported in an anti-overturning manner after the T-shaped beam is installed.
The temporary support can change the height of the support by changing the volume of the sand in the sand box, and is suitable for different construction requirements.
The temporary support adopts an insert block structure, is convenient to disassemble, and can realize the convenience and reliability of disassembling the temporary support.
The main structure of the invention adopts intelligent control, which can effectively save labor force, improve construction efficiency and avoid consequences caused by human errors.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a front view of the entire structure.
Fig. 2 is a top view of the entire structure.
Fig. 3 is a side sectional view of the structural unit 1-1.
Fig. 4 shows a temporary support substructure.
Fig. 5 and 6 are a front view and a side view of the upper structure of the temporary support.
Fig. 7 is a schematic view of the internal jack of the temporary support superstructure.
In the figure: the supporting structure comprises a guide plate 1, a guide plate supporting rod 2, a guide plate supporting rod 3, a rotary node of the guide plate supporting rod, a telescopic lateral supporting rod 4, a rotary node of the lateral supporting rod 5, a base 6, a hydraulic lifting platform 7, a boosting jack 8, a boosting plate 9, a sand box 10, a bolt hole 11, a scale guide rail 12, a temporary support lower part bearing structure 13, a reinforcing plate 14, a limiting groove 15, an embedded block 16, a temporary support upper structure 17, a rubber pad steel plate composite plate 18, a hydraulic jack 19, a limiting block 20, a limiting ridge on the upper part 21 and a bearing block on the upper part 22.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
The terms "mounting", "connecting", "fixing" and the like in the present invention should be understood broadly, for example, they may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described in the background art, the present invention provides a temporary support for improving the stability of the mounting and positioning accuracy of a T-beam, in order to solve the above technical problems.
In a typical embodiment of the present invention, as shown in fig. 1, the temporary support for improving the mounting and positioning accuracy and stability of the T-beam provided in this embodiment includes a base 6, a T-beam positioning device, and a temporary support.
The bolt hole that reserves on 6 accessible bases of base passes through the bolt fastening on the bent cap of preinstallation T roof beam, T roof beam positioner fixes in 6 upper portion both sides of base, interim support is fixed in base upper portion centre position, is located the prefabricated T roof beam under waiting to install.
Further, the base 6 includes a horizontal portion and two side portions extending upward along both ends of the horizontal portion, the two side portions being perpendicular to the horizontal portion.
Furthermore, the T-beam positioning device comprises a first positioning device, a second positioning device and a third positioning device;
as shown in fig. 1, the first positioning device is located at the left end of the base 6 and includes a hydraulic lifting platform 7, the hydraulic lifting platform 7 is installed on the base and can stretch up and down, the hydraulic lifting platform 7 is provided with a boosting jack 8, the boosting jack 8 is connected with a boosting plate 9, and the boosting plate 9 is pushed to move in the horizontal direction.
The second positioning device comprises four telescopic lateral supporting rods 4, and the four telescopic lateral supporting rods 4 are positioned at four corners of the base 6; the telescopic lateral supporting rods 4 on the left side and the right side are symmetrically arranged; the four telescopic lateral supporting rods 4 can be telescopic towards the middle position of the base 6.
The third positioning device is located at the right end of the base 6 and comprises a guide plate 11, the guide plate 11 is located at a position close to the right end of the base, the bottom of the guide plate is mounted on a guide rail 12, the right side of the guide plate 11 is supported by a support rod 12, and one end of the support rod 12 is hinged to the base 6 and is a rotation node 3 of the support rod 12 relative to the base 6 as shown in fig. 1; the other end of the support rod 12 is connected with the guide plate 1;
the temporary support comprises a lower bearing structure 13, two limiting blocks 15 are arranged at the top of the lower bearing structure 13, a gap is reserved between the two limiting blocks 15, a mounting hole (shown in fig. 3) is formed in each limiting block body, namely, four embedded blocks are mounted in the temporary support, two embedded blocks 16 are mounted in the gap between the two limiting blocks 15, and the two embedded blocks 16 are mounted between the two limiting blocks 15 in the front and back direction according to the direction shown in fig. 1; each limiting block body is also internally provided with an embedded block 16, and the two embedded blocks 16 are distributed left and right, as shown in fig. 3, which is a left view of the distribution; the upper parts of the insert blocks 16 on the left and right sides are provided with limit blocks 20, and after the insert blocks 16 are drawn out, the limit blocks 20 fall down.
In a further technical scheme, the limiting block 20 is of a triangular prism structure, preferably, the cross section of the limiting block 20 is of a right triangle, after the insert 16 is pulled out of the mounting hole, the limiting block 20 falls down, and the inclined surface of the limiting block 20 and the inclined surface of the upper limiting ridge 21 are on the same plane, so that the temporary support upper structure 17 can slide down along the inclined surface of the limiting block 20.
Further technical scheme, temporary support superstructure 17 include rubber pad steel sheet compoboard 18, upper portion spacing arris 21, upper portion bearing block 22 is a rectangle piece, rubber pad steel sheet compoboard 18 fix the top at upper portion bearing block 22, upper portion spacing arris 21 is located the both sides of upper portion bearing block 22, and the shape of upper portion spacing arris 21 is triangle-shaped. The upper stopper ribs 21 extend in the longitudinal direction into the stopper 15 on the left and right sides, as shown in fig. 3. Preferably, the cross section of the upper limiting edge 21 in the embodiment is a right triangle. The inclined plane of which is parallel to the inclined plane of the limiting block 20.
Furthermore, a hydraulic jack 19 is arranged inside the rubber-steel plate composite plate 18 and the upper bearing block 22.
The guide plate 1 is matched with the boosting device, the efficiency is high, the reliability is good, the position of the guide plate 1 can be adjusted through the guide rail on the base, the guide plate is suitable for different construction and installation requirements of prefabricated T-shaped beams with different sizes, and the positioning accuracy and the stability of the T-shaped beams during installation can be effectively improved.
Further, the temporary support is arranged on the sand box 10, sand is contained in the sand box 10, the temporary support is arranged on the sand, and the lower bearing structure 13 of the temporary support is connected with the sand box through four reinforcing plates 14 for reinforcement. The height of the temporary support is changed by changing the volume of sand in the sand box 10 at the bottom of the temporary support.
Specifically, the working principle of the present invention is as follows:
the prefabricated T beam is manufactured in a prefabricated field, tensioned and maintained and the like, then is conveyed to the field through a gun carriage, and is conveyed to the top of the cover beam through the matching of a bridge girder erection machine and a crane. The temporary support of this device uses and to dismantle the voussoir and constitute, takes out the voussoir when demolising the temporary support and makes the support descend to accomplish the temporary support in the system conversion process and demolish work.
During site operation, the position of the temporary support on the bent cap is predetermined firstly, sundries such as concrete broken particles on the upper portion of the bent cap are cleaned, the position of the base 6 is adjusted manually, generally, the center line of the base 6 is aligned with the center line of the permanent support, namely, the base is checked, and the base can be fixed through four reserved bolt holes 11 on the base after adjustment.
The size of the bottom horseshoe part of the T-shaped beam to be installed is predetermined, the guide plate 1 of the device can be adjusted to a corresponding position through remote control, scales are engraved on the guide rails 12 on two sides of the guide plate 1, namely the vertical distance between the root of the guide plate 1 and the center point of the base 6, generally speaking, the scales of the guide rails 12 are half of the width of the horseshoe of the T-shaped beam, and corresponding adjustment can be performed if special construction requirements exist, such as the deviation of the T-shaped beam and a temporary support in a certain size.
The height of the temporary support is calculated in advance, the height of the temporary support is changed by changing the volume of sand in the sand box 10 at the bottom of the temporary support, and fine sand in the sand box is smoothed and compacted.
The temporary support is set to a loaded state, i.e. the bottom four inserts 16 are put in the corresponding positions, and the internal hydraulic jack 19 is adjusted to an initial state.
The temporary support is placed on the sand box 10 with the adjusted height, the reinforcing plates 14 on four sides are embedded into the corresponding clamping grooves respectively, as shown in the figure, the four reinforcing plates 14 are located on four sides of the bottom of the temporary support respectively, the reinforcing plates 14 not only improve the strength and the stability of the temporary support, but also enable the temporary support to be better matched with the sand box, and the temporary support can effectively work together.
After the height of the temporary support is adjusted and checked, the T-shaped beam to be installed is conveyed to the top of the device by a bridge girder erection machine to be approximately aligned with the central line of the device, the T-shaped beam is slowly lowered by the bridge girder erection machine and is close to the upper part of the guide plate 1 to be continuously lowered, the T-shaped beam horseshoe is close to the top end of the temporary support along the guide plate 1, the height of the hydraulic lifting platform 7 is controlled by remote control to be approximately 20 centimeters higher than the bottom of the T-shaped beam, the boosting jack 8 is started, the boosting plate 9 is slowly close to the T-shaped beam horseshoe until the T-shaped beam is attached, pressurization is continuously carried out to enable the other side of the T-shaped beam horseshoe to be attached to the guide plate, and the T-shaped beam is continuously lowered by the bridge girder erection machine to be located on the top plate of the temporary support.
After the T-beam falls on the temporary support, the telescopic lateral support rods 4 at the four corners of the base 6 are lifted and extended to be fixed at the junction of the top plate of the web plate of the T-beam, and the lateral support is completed.
The method comprises the steps of starting the conversion of a bridge simple support conversion continuous system, entering a temporary support dismantling step, firstly putting down four telescopic lateral support rods, then moving a guide plate 1 to the right, unloading a boosting jack 8, and moving the boosting plate to the left to separate the boosting plate from a T-shaped beam.
The four-side embedded blocks are detached by pulling handles of the embedded blocks 16 on the base, the limiting blocks 20 naturally fall down to form smooth slopes with the limiting grooves 15, the jack 19 in the upper structure of the temporary support is opened, and the bottom of the jack is fixed with the upper structure of the temporary support, so that the top plate of the temporary support is separated from the bottom of the T-shaped beam.
And (4) removing the four bolts between the base and the bent cap, taking the device down from the bent cap, and completing the removal of the temporary support, so that the system is successfully converted.
The above embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions or alterations made to the above structures of the present invention without departing from the basic technical idea of the present invention as described in the above patent according to the general technical knowledge and common practice in the art can be within the scope of the present invention.
Finally, it is also noted that relational terms such as first and second, and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A temporary supporting device for improving the stability of the mounting and positioning accuracy of a T beam is characterized by comprising a base, a T beam positioning device and a temporary support;
the T-beam positioning device comprises a first positioning device, a second positioning device and a third positioning device;
the first positioning device is positioned at one end of the base and comprises a hydraulic lifting platform which is arranged on the base and can stretch up and down, a boosting jack moving in the horizontal direction is arranged on the hydraulic lifting platform, and the boosting jack is connected with a boosting plate; the second positioning device comprises telescopic lateral supporting rods positioned at four corners of the base, and the four telescopic lateral supporting rods can extend towards the middle position of the base; the third positioning device is positioned at the other end of the base and comprises a guide plate, the bottom of the guide plate is arranged on the guide rail, and the guide plate is supported by a support rod;
the temporary support is positioned in the middle of the base and comprises a lower bearing structure and an upper structure; two limiting blocks are vertically arranged at the top of the lower bearing structure, a gap is reserved between the two limiting blocks, a mounting hole is formed in each limiting block body, the upper structure is inserted into the gap and the mounting holes, and a hydraulic jack is arranged in the upper structure;
the upper structure comprises a rubber pad steel plate combined plate, upper limiting edges and an upper bearing block, wherein the upper bearing block is a rectangular block, the rubber pad steel plate combined plate is fixed at the top of the upper bearing block, the upper limiting edges are fixed on two sides of the upper bearing block, and the upper limiting edges are triangular;
two ends of the upper limiting edge extend into the limiting block mounting holes on two sides in the length direction to limit the upper structure;
the upper bearing block is arranged in the gap, and two ends of the upper bearing block are fixed through an embedded block respectively;
the position of the upper limiting edge is fixed by an embedded block and a limiting block which are embedded into the mounting hole;
the base is fixed on the bent cap of the pre-installed T-shaped beam through a bolt hole reserved on the base;
the base comprises a horizontal part and two side parts, the two side parts extend upwards along two ends of the horizontal part, and the two side parts are perpendicular to the horizontal part;
the guide plate is connected with a driving device, and the driving device can drive the guide plate to move along the two guide rails.
2. A temporary supporting device for improving the mounting and positioning accuracy and stability of a T-beam as claimed in claim 1, wherein the temporary support is mounted on a sand box, and sand is contained in the sand box.
3. A method for supporting a T-shaped beam by using the temporary supporting device for improving the installation and positioning accuracy and stability of the T-shaped beam as claimed in any one of claims 1-2,
firstly, the position of a temporary support on a cover beam is predetermined, the position of a base is adjusted, the alignment of the center line of the base and the center line of a permanent support is the check completion, and the base can be fixed through four reserved bolt holes on the base after the adjustment is completed;
the size of a horseshoe part at the bottom of a T-shaped beam to be installed is predetermined, and a guide plate 1 of the device can be adjusted to a corresponding position through remote control;
the height of the temporary support is calculated in advance, and the height of the temporary support is changed by changing the volume of sand in a sand box at the bottom of the temporary support;
setting the temporary support to be in a loaded state, namely putting the four embedding blocks at the bottom into corresponding positions, and adjusting the internal hydraulic jack to be in an initial state;
placing the temporary support on the sand box with the adjusted height, wherein the reinforcing plates on the four sides are respectively embedded into the corresponding clamping grooves, and the four reinforcing plates are respectively positioned on the four sides of the bottom of the temporary support;
after the height of the temporary support is adjusted and checked, the T-shaped beam to be installed is conveyed to the top of the device and is approximately aligned with the center line of the device, the T-shaped beam is lowered and is close to the upper part of the guide plate and is continuously lowered, the T-shaped beam horseshoe is close to the top end of the temporary support along the guide plate 1, the height of the hydraulic lifting platform is controlled through remote control, the top of the hydraulic lifting platform is higher than the bottom of the T-shaped beam, a boosting jack is started, the boosting plate slowly approaches the T-shaped beam horseshoe until the T-shaped beam horseshoe is attached, pressurization is continuously carried out to enable the other side of the T-shaped beam horseshoe to be attached to the guide plate, and the bridge girder erection machine continuously lowers the T-shaped beam to enable the T-shaped beam to fall on the top plate of the temporary support;
after the T beam falls on the temporary support, lifting the telescopic lateral support rods at the four corners of the base, extending the telescopic lateral support rods, fixing the telescopic lateral support rods at the junction of the top plate of the web plate of the T beam, and completing lateral support;
starting the conversion of the bridge simple support conversion continuous system, entering a temporary support dismantling step, firstly putting down four telescopic lateral support rods, then moving a guide plate to the right, unloading a boosting jack, and moving the boosting plate to the left to separate the boosting plate from a T beam;
the four-side embedded blocks are detached by pulling handles of the embedded blocks on the base, the limiting blocks naturally fall down to form smooth slopes with the limiting grooves, a jack in the upper structure of the temporary support is started, the bottom of the jack is fixed with the upper structure of the temporary support, and therefore the top plate of the temporary support is separated from the bottom of the T-shaped beam;
and (4) removing four bolts between the base and the cover beam, taking the device down from the cover beam, and finishing the removal of the temporary support, so that the system is successfully converted.
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| CN115387233A (en) * | 2022-09-09 | 2022-11-25 | 中铁广州工程局集团有限公司 | Construction method for large-span and large-volume bent cap of transition pier of composite beam cable-stayed bridge |
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