CN114753259A - Alignment leveling method for precast beam erection construction - Google Patents
Alignment leveling method for precast beam erection construction Download PDFInfo
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- CN114753259A CN114753259A CN202210456590.3A CN202210456590A CN114753259A CN 114753259 A CN114753259 A CN 114753259A CN 202210456590 A CN202210456590 A CN 202210456590A CN 114753259 A CN114753259 A CN 114753259A
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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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Abstract
The invention discloses a contraposition leveling method for precast beam erection construction, which comprises the steps of firstly, recording a 30cm height marking line at the bottom of a precast beam, a support center cross line and a beam end line on a joist coping according to a preset falling position of the precast beam, arranging a jack at the top of the pier cap, adjusting the jack to enable the top surface of the precast beam to be positioned at the same height, hoisting the precast beam for contraposition installation, enabling the precast beam to fall onto the jack, secondly, checking the beam surface of the precast beam, and finally, adjusting the beam surface height through the jack to ensure that the precast beam surface is kept level with the erected section beam surface, thirdly, pouring grouting material into a reserved hole of the joist stone and a gap between the precast beam and the joist stone, and finally, dismantling the jack after the grouting material reaches the required strength to complete the construction. According to the invention, the height of the hoisted precast beam is adjusted by lifting the piston rod of the jack in a mode of arranging the jack on the pier cap of the pier, the adjustment mode is convenient, flexible, rapid and safe, the beam dismantling and secondary alignment leveling are not required, and the installation efficiency of the precast beam can be greatly improved.
Description
Technical Field
The invention relates to the technical field of prefabricated beam frame facilities, in particular to a contraposition leveling method for prefabricated beam erection construction.
Background
In order to reduce the construction cost and accelerate the construction progress, the method of 'beam yard prefabrication and field assembly' is mostly adopted in the bridge construction at present. And after the prefabrication of the precast beam in the beam yard is finished, the precast beam is conveyed to a construction site and is installed on a pier through hoisting equipment. When the bridge is installed in an aligned mode, in order to enable the beam surface to be flush with the beam surface of the erected section, sand bags are usually stacked between the pier top and the beam stones or dry and hard mortar is poured between the pier top and the beam stones to adjust the height of the beam body. When the sandbag is adopted for adjustment, because the sandbag is easy to deform under pressure, the designed adjustment height is often inconsistent with the actual adjustment height, and phenomena such as inclination of a beam body, non-parallel and level with the beam surface of an erected section and the like are easy to occur; when the adjustment of pouring dry and hard mortar is adopted, the construction is complicated, and the adjustment flexibility is poor. More importantly, no matter which mode is adopted, if the installation of roof beam body is not up to standard, all need demolish the back with the precast beam and carry out the secondary leveling of counterpointing, not only extravagant manpower, material resources influence frame roof beam construction progress moreover.
Disclosure of Invention
In order to solve the problems, the invention provides a simple, flexible, safe and reliable alignment and leveling method for precast beam erection construction, which can specifically adopt the following technical scheme:
The invention relates to an alignment leveling method for precast beam erection construction, which comprises the following steps:
marking a 30cm height mark line at the bottom of a beam on the side surface of a bolster stone for supporting the precast beam according to the preset falling position of the precast beam, and marking a support center cross line and a beam end line on the top surface of the bolster stone;
secondly, mounting jacks at the tops of pier caps where the pad beams are located, enabling the jacks to be symmetrically arranged along the longitudinal line of the cross line of the center of the support, and then adjusting the jacks by taking the 30cm height mark line of the beam bottom as a reference to enable the top surfaces of the jacks to be located at the same height;
thirdly, hoisting the precast beam for contraposition installation, enabling the precast beam to fall onto a jack, aligning two ends of the precast beam with beam end lines respectively at the moment, aligning a support center of the precast beam with a support center cross line marked on the pad stone respectively, arranging a gap between the bottom surface of the support of the precast beam and the top surface of the pad stone, and inserting the support embedded bolt of the precast beam into a preformed hole of the pad stone correspondingly;
checking the beam surface of the precast beam, and adjusting the height of the beam surface through a jack to ensure that the beam surface is kept level with the beam surface of the erected section;
and fifthly, pouring grouting materials into the preformed hole of the pad beam stone and the gap between the prefabricated beam and the pad beam stone, and dismantling the jack after the grouting materials reach the required strength to complete construction.
The jack is close to the set beam stone and is arranged at one end far away from a beam end line.
The jack is provided with two on each pier cap, and the central line of each jack is 25cm apart from the longitudinal line of support center cross line.
And in the second step, the distance between the top surface of the jack and the 30cm height mark line of the beam bottom is 30 cm.
And in the third step, the distance between the bottom surface of the support of the precast beam and the top surface of the pad beam stone is 2-3 cm.
And the grouting material in the fifth step adopts CGM high-strength support grouting material.
According to the alignment and leveling method for precast beam erection construction, the height of the hoisted precast beam is adjusted by lifting the piston rod of the jack in a mode of arranging the jack on the pier cap of the pier, the adjustment mode is convenient, flexible, rapid and safe, beam dismantling and secondary alignment and leveling are not needed, and the installation efficiency of the precast beam can be greatly improved; simultaneously, set up beam-ends mark line on pier pad roof beam stone, further improved the counterpoint installation accuracy of precast beam, guaranteed the construction quality of bridge, effectively improved the construction progress of bridge.
Drawings
FIG. 1 is a schematic view showing the positional relationship between a precast beam and a one-sided bolster when the precast beam is dropped.
Fig. 2 is a view from a-a of fig. 1.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings, which are implemented on the premise of the technical solution of the present invention, and give detailed implementation manners and specific construction processes, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 and 2, the alignment and leveling method for precast beam erection construction, provided by the invention, comprises the following steps:
the first step, utilize total powerstation and spirit level to measure, according to the predetermined whereabouts position of precast beam 1, mark respectively two bolster stones 2 that are used for bearing precast beam 1, include: the center of the base beam stone 2 is marked on the top surface of the base beam stone 2 by a support center cross line 3, a beam bottom 30cm height line 4 (namely, a position 30cm below a design elevation of the beam bottom of the precast beam 1) is marked on the side surface of the base beam stone 2, and a beam end line 5 is marked on the top surface of the base beam stone 2. In general, each bolster stone 2 is provided with four prepared holes 6, which are respectively located at four corners of the support center cross 3.
Secondly, cleaning sundries on the top surface of a pier cap 7 where a joist stone 2 is located, then symmetrically installing two 100t screw jacks 8 (in the embodiment, two jacks 8 are arranged, and the installation quantity can be adjusted according to specific working conditions) at 25cm positions on the left side and the right side of the pier cap 7 at one end, far away from a beam end line 5, of the top surface of the pier cap 7 and close to the joist stone 2 by taking a longitudinal line of a support center cross line 3 of the joist stone 2 as a reference, and then adjusting the top surfaces of the jacks 8 to the same height by taking a beam bottom 30cm mark line 4 as a reference. Typically, the top surface of the jack 8 is spaced 30cm from the 30cm height line 4 of the beam bottom.
And thirdly, hoisting the precast beam 1 through equipment such as a bridge girder erection machine, wherein the precast beam 1 needs to be adjusted and aligned before being in place, when the two ends of the precast beam 1 are respectively aligned with the beam end lines 5 on the two pad beams 2 and the support centers of the precast beam 1 are respectively aligned with the support center cross lines 3 marked on the two pad beams 2, the alignment is completed, the precast beam 1 falls onto a jack 8 of a pier, at the moment, the gap between the bottom surface of the support of the precast beam 1 and the top surface of the pad beams 2 is 2-3cm, and the support embedded bolts of the precast beam 1 are correspondingly inserted into the preformed holes 6 of the pad beams 2.
Fourthly, checking the beam falling position of the precast beam 1 in a steel ruler measurement mode; and checking the flatness of the beam surface by adopting a mode of measuring by using a horizontal ruler, and if the flatness does not reach the standard, adjusting the height of the beam body of the precast beam 1 by adjusting the height of a piston rod of the jack 8 so as to adjust the height of the beam surface and ensure that the beam surface is kept level with the beam surface M of the erected section.
Fifthly, pouring grouting material (usually CGM high-strength support grouting material) into the preformed hole 6 of the joist stone 2 and the gap between the precast beam 1 and the joist stone 2, and dismantling the jack 8 after the grouting material reaches the required strength to complete construction.
Because jack 8 can be installed before falling the roof beam, and the installation is firm reliable, and the later stage has the degree to stretch out and draw back when carrying out height control to its piston rod, and is nimble controllable, need not the secondary and tear the roof beam open and can reach the orderly adjustment to the roof beam body height, effectively satisfies the beam surface roughness requirement. Compared with the prior art, the construction method has the advantages of fast construction, investment saving, safety and reliability, and effectively improves the installation efficiency of the precast beam.
It should be noted that in the description of the present invention, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (6)
1. An alignment leveling method for precast beam erection construction is characterized by comprising the following steps:
marking a 30cm height mark line at the bottom of a beam on the side surface of a bolster stone for supporting the precast beam according to the preset falling position of the precast beam, and marking a support center cross line and a beam end line on the top surface of the bolster stone;
secondly, mounting jacks at the tops of pier caps where the pad beams are located, enabling the jacks to be symmetrically arranged along the longitudinal line of the cross line of the center of the support, and then adjusting the jacks by taking the 30cm height mark line of the beam bottom as a reference to enable the top surfaces of the jacks to be located at the same height;
thirdly, hoisting the precast beam for alignment installation, so that the precast beam falls on a jack, at the moment, two ends of the precast beam are respectively aligned with beam end lines, the center of a support of the precast beam is respectively aligned with a support center cross line marked on a pad beam stone, the bottom surface of the support of the precast beam is arranged with a gap with the top surface of the pad beam stone, and a support embedded bolt of the precast beam is correspondingly inserted in a preformed hole of the pad beam stone;
Checking the beam surface of the precast beam, and adjusting the height of the beam surface through a jack to ensure that the beam surface is kept level with the beam surface of the erected section;
and fifthly, pouring grouting materials into the preformed hole of the pad beam stone and the gap between the prefabricated beam and the pad beam stone, and dismantling the jack after the grouting materials reach the required strength to complete construction.
2. The alignment leveling method for precast beam erection construction according to claim 1, wherein: the jack is close to the set beam stone and is arranged at one end far away from a beam end line.
3. The alignment and leveling method for precast beam erection construction according to claim 2, wherein: the jack is provided with two on each pier cap, and the distance between the central line of each jack and the longitudinal line of the cross line of the center of the support is 25 cm.
4. The alignment leveling method for precast beam erection construction according to claim 1, wherein: and in the second step, the distance between the top surface of the jack and the 30cm height marking line at the bottom of the beam is 30 cm.
5. The alignment and leveling method for precast beam erection construction according to claim 1, wherein: and in the third step, the distance between the bottom surface of the support of the precast beam and the top surface of the pad beam stone is 2-3 cm.
6. The alignment leveling method for precast beam erection construction according to claim 1, wherein: and the grouting material in the fifth step adopts CGM high-strength support grouting material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210456590.3A CN114753259A (en) | 2022-04-28 | 2022-04-28 | Alignment leveling method for precast beam erection construction |
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| CN202210456590.3A CN114753259A (en) | 2022-04-28 | 2022-04-28 | Alignment leveling method for precast beam erection construction |
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| CN114753259A true CN114753259A (en) | 2022-07-15 |
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| CN202210456590.3A Pending CN114753259A (en) | 2022-04-28 | 2022-04-28 | Alignment leveling method for precast beam erection construction |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001106484A (en) * | 1999-10-07 | 2001-04-17 | Topy Ind Ltd | Jack device dedicated for replacement of steel bridge support and method for replacement |
| CN101476291A (en) * | 2009-01-21 | 2009-07-08 | 中铁一局集团有限公司 | Segment-assembling simply supported box girder movable falsework construction method |
| CN106087757A (en) * | 2016-08-01 | 2016-11-09 | 中铁十七局集团第三工程有限公司 | A high position in box beam erection falls beam construction method |
| CN109610328A (en) * | 2018-12-18 | 2019-04-12 | 中铁隧道集团处有限公司 | Straddle-type monorail Simple-supported PC Rail Beam in Light Rail high accuracy install method |
| CN110093859A (en) * | 2019-05-07 | 2019-08-06 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of railway prefabricated beam falls girder system system automatically and falls beam construction method |
| CN110565544A (en) * | 2019-08-21 | 2019-12-13 | 上海天演建筑物移位工程股份有限公司 | support replacing method |
| CN212561210U (en) * | 2020-06-15 | 2021-02-19 | 中铁七局集团郑州工程有限公司 | Template for checking preformed hole of bridge bearing and marking auxiliary beam erecting line |
-
2022
- 2022-04-28 CN CN202210456590.3A patent/CN114753259A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001106484A (en) * | 1999-10-07 | 2001-04-17 | Topy Ind Ltd | Jack device dedicated for replacement of steel bridge support and method for replacement |
| CN101476291A (en) * | 2009-01-21 | 2009-07-08 | 中铁一局集团有限公司 | Segment-assembling simply supported box girder movable falsework construction method |
| CN106087757A (en) * | 2016-08-01 | 2016-11-09 | 中铁十七局集团第三工程有限公司 | A high position in box beam erection falls beam construction method |
| CN109610328A (en) * | 2018-12-18 | 2019-04-12 | 中铁隧道集团处有限公司 | Straddle-type monorail Simple-supported PC Rail Beam in Light Rail high accuracy install method |
| CN110093859A (en) * | 2019-05-07 | 2019-08-06 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of railway prefabricated beam falls girder system system automatically and falls beam construction method |
| CN110565544A (en) * | 2019-08-21 | 2019-12-13 | 上海天演建筑物移位工程股份有限公司 | support replacing method |
| CN212561210U (en) * | 2020-06-15 | 2021-02-19 | 中铁七局集团郑州工程有限公司 | Template for checking preformed hole of bridge bearing and marking auxiliary beam erecting line |
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