CN108225896B - Cast-in-place continuous beam No. 0 segment bracket static load preloading testing device and testing method - Google Patents
Cast-in-place continuous beam No. 0 segment bracket static load preloading testing device and testing method Download PDFInfo
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Abstract
The invention discloses a device and a method for testing the static load preloading of a bracket of a No. 0 segment of a cast-in-place continuous beam, and solves the problems of long preloading period, difficulty in fine adjustment of preloading weight and high labor intensity in hoisting of a preloading material in the conventional method. A bottom die water bag (9) is arranged on the bottom die plate (7), a bottom die water bag water injection pipe (11) is connected to a bottom die water bag water injection port (10), a bottom die water bag water injection pump (12) is connected to the bottom die water bag water injection pipe (11), a left water bag string bag (15) and a left water bag (14) are hung and connected to the left I-shaped steel cross beam (5) of the pier body, and a left water bag water injection pump (18) is connected to the left water bag water injection pipe (17); a right water bag string bag (21) and a right water bag (20) are hung on the right I-shaped steel cross beam (5) of the pier body, and a right water bag water injection pump (24) is connected to a right water bag water injection pipe (23); the invention has high prepressing efficiency, low labor intensity and simple and convenient prepressing weight adjustment operation.
Description
Technical Field
The invention relates to a static load prepressing test device and a static load prepressing test method for a cast-in-place continuous beam template and a template bracket, in particular to a static load prepressing test device and a static load prepressing test method for a number 0 section template bracket and a template of a cast-in-place continuous beam.
Background
In the construction of the bridge cast-in-place method, after the construction of a pier body is completed, section bracket 0 of a continuous beam is required to be installed on two sides of the pier body, a beam steel cushion block is installed on the section bracket 0, an I-shaped steel beam is arranged on the beam steel cushion block, the I-shaped steel beam is arranged on the beam steel cushion block, a formwork bent frame is arranged on the I-shaped steel beam, and a section bottom formwork template 0 and a side formwork template are installed on the section formwork bent frame 0, so that the construction of the cast-in-place concrete formwork of the section 0 is completed. In the process of pouring the concrete into the No. 0 section, in order to enable the bracket supporting structure to meet the load requirement and avoid rigid deformation, a static load prepressing test must be carried out on the No. 0 section bracket and a built template thereof, whether the requirement of the limit bearing capacity can be met or not is observed, and the inelastic deformation and the elastic deformation of the bracket are eliminated through the static load prepressing test. The existing bracket prepressing test method mainly uses concrete precast blocks or sand bags to stack on a No. 0 segment bottom formwork for load test. The testing method needs to hoist a large amount of concrete precast blocks or sand bags to the No. 0 segment bottom formwork for surcharge loading to complete the bracket prepressing test, and because the elastic deformation has repeatability, when the prepressing time is short, the elastic deformation can not be eliminated after unloading, therefore, the prepressing time is prolonged on site to completely eliminate the repeated phenomenon of the elastic deformation; the specific judging method comprises the following steps: after the pre-pressing is carried out on site for a certain time, whether the 48-hour accumulated settlement of the No. 0 section bottom template and the No. 0 section bracket exceeds 2 mm is measured and used as a technical index for eliminating the elastic deformation, the pre-pressing time on site is generally required to be as long as 7 days, the pre-pressing period of the No. 0 section bottom template and the No. 0 section bracket is long, and the integral construction progress of the No. 0 section is influenced; in addition, the concrete precast blocks or the sand bags are hoisted to the No. 0 segment bottom formwork, so that the defects of large hoisting capacity and high dependence on hoisting machinery exist; in addition, the pre-pressing load is required to be controlled to be about 1.1 times of the total weight of the No. 0 section in the test process, so that the weight of the pre-pressing precast block or the sand bag needs to be adjusted in a proper fine adjustment mode in the test, and the fine adjustment mode has the problem of difficult realization in actual operation.
Disclosure of Invention
The invention provides a device and a method for testing the static load preloading of a bracket of a No. 0 segment of a cast-in-place continuous beam, and solves the technical problems of long preloading period, difficulty in fine adjustment of preloading weight and high labor intensity in hoisting of a preloading material in the prior art.
The invention solves the technical problems through the following technical scheme:
a static load pre-pressing testing device for a No. 0 segment bracket of a cast-in-place continuous beam comprises a bearing platform, wherein a pier is arranged on the bearing platform, no. 0 segment template brackets are respectively arranged on two sides of the pier, a crossbeam steel cushion block is arranged on each template bracket, an I-shaped steel crossbeam is arranged on each crossbeam steel cushion block, a component force bent frame is arranged on each I-shaped steel crossbeam, a No. 0 segment bottom template and a side template are arranged on each component force bent frame, a bottom die water bag is arranged on each bottom template, a bottom die water bag water filling port is arranged on each bottom die water bag, a bottom die water bag water filling pipe is connected to each bottom die water bag water filling port, the left water bag water injection port is connected with a left water bag water injection pipe which is connected with a left water bag water injection pump, and the left water bag water injection pipe is provided with a left water bag flowmeter; hang on pier shaft right side I-steel crossbeam and connect right side water bag string bag, be provided with the right side water bag in right side water bag string bag, be provided with right side water bag water filling port on the water bag of right side, be connected with right side water bag water injection pipe on right side water bag water filling port, be connected with right side water bag water injection pump on right side water bag water injection pipe, be provided with right side water bag flowmeter on right side water bag water injection pipe.
A water quantity controller is arranged on the ground on one side of the bearing platform and is respectively electrically connected with the bottom die water bag water injection pump, the bottom die water bag water injection flow meter, the left side water bag water injection pump, the right side water bag water injection pump and the right side water bag flow meter; the bottom die water bag water injection pump, the left side water bag water injection pump and the right side water bag water injection pump are respectively communicated with the reservoir through various water inlet pipelines.
A static load preloading test method for a No. 0 segment bracket of a cast-in-place continuous beam comprises the following steps:
the method comprises the following steps of firstly, arranging a bottom die water bag on a bottom die plate, arranging a bottom die water bag water injection port on the bottom die water bag, connecting a bottom die water bag water injection pipe on the bottom die water bag water injection port, connecting a bottom die water bag water injection pump on the bottom die water bag water injection pipe, arranging a bottom die water bag water injection flowmeter on the bottom die water bag water injection pipe, hanging a left water bag string bag on an I-shaped steel cross beam on the left side of a pier body, arranging a left water bag in the left water bag string bag, arranging a left water bag water injection port on the left water bag, connecting a left water bag water injection pipe on the left water bag water injection port, connecting a left water bag water injection pump on the left water bag water injection pipe, and arranging a left water bag flowmeter on the left water bag water injection pipe; a right water bag string bag is hung and connected on an I-shaped steel cross beam on the right side of the pier body, a right water bag is arranged in the right water bag string bag, a right water bag water injection port is arranged on the right water bag, a right water bag water injection pipe is connected to the right water bag water injection port, a right water bag water injection pump is connected to the right water bag water injection pipe, and a right water bag flowmeter is arranged on the right water bag water injection pipe;
secondly, injecting water into the bottom die water bag by controlling a bottom die water bag water injection pump, enabling the weight of the injected water to be 30% of the total weight of the No. 0 block section through a bottom die water bag water injection flow meter, and closing the bottom die water bag water injection pump to stop injecting water;
thirdly, by controlling the left water bag water injection pump and the right water bag water injection pump, injecting water into the left water bag and the right water bag simultaneously, and observing the left water bag flowmeter and the right water bag flowmeter, the water quantity weight in the left water bag and the water quantity weight in the right water bag are increased simultaneously and equivalently to keep the balance of the load stress of the No. 0 section template bracket, and when the total weight of the water quantity in the bottom die water bag, the water quantity of the left water bag and the water quantity in the right water bag and the total weight of the water quantity in the right water bag reach 110 percent of the total weight of the No. 0 section, the left water bag water injection pump and the right water bag water injection pump are closed simultaneously;
fourthly, after pre-pressing for 48 hours, equivalently releasing water in the left water bag and the right water bag by controlling a water valve on the water injection pipe of the left water bag and a valve on the water injection pipe of the right water bag until the water bags are emptied, and then releasing the bottom die water bag by a valve on the water injection pipe of the bottom die water bag until the water bags are emptied;
fifthly, after 6 hours, injecting water into the bottom die water bag by controlling a bottom die water bag water injection pump, enabling the weight of the injected water to be 30% of the total weight of the number 0 block section through a bottom die water bag water injection flow meter, and closing the bottom die water bag water injection pump to stop water injection; controlling the left water bag water injection pump and the right water bag water injection pump, injecting water into the left water bag and the right water bag simultaneously, observing the left water bag flowmeter and the right water bag flowmeter to increase the water volume weight in the left water bag and the water volume weight in the right water bag simultaneously in an equivalent manner so as to keep the balance of the load stress of the No. 0 section template bracket, and closing the left water bag water injection pump and the right water bag water injection pump simultaneously until the total weight of the water volume in the bottom die water bag, the water volume of the left water bag and the water volume in the right water bag reaches 110 percent of the total weight of the No. 0 section;
sixthly, after pre-pressing for hours, equivalently releasing water in the left water bag and the right water bag by controlling a water valve on a water injection pipe of the left water bag and a valve on a water injection pipe of the right water bag until the left water bag and the right water bag are emptied, and then releasing the bottom die water bag by a valve on a water injection pipe of the bottom die water bag until the bottom die water bag is emptied;
seventhly, stopping the load preloading operation when the measured 48-hour accumulated settlement of the No. 0 section bottom template and the No. 0 section template bracket is less than 2 millimeters; and if the measured cumulative settlement of the No. 0 section bottom template and the No. 0 section template bracket in 48 hours is more than or equal to 2 mm, repeating the steps of the fifth step and the sixth step.
The invention has high prepressing efficiency, low labor intensity and simple and convenient prepressing weight adjustment operation, can be tested by pumping water with a water pump and controlling the prepressing weight according to the water flow in the water injection process. The water bag has the characteristics of simple and accurate test, low manufacturing cost, reusability and the like, so that the material is convenient to transfer after being used.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the present invention in a left-hand view;
fig. 3 is a schematic view of the present invention in a top view.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a static load pre-pressing testing device for No. 0 segment brackets of cast-in-place continuous beams comprises a bearing platform 1, wherein a pier 2 is arranged on the bearing platform 1, no. 0 segment template brackets 3 are respectively arranged on two sides of the pier, crossbeam steel cushion blocks 4 are arranged on the template brackets 3, I-shaped steel crossbeams 5 are arranged on the crossbeam steel cushion blocks 4, a component force bent frame 6 is arranged on the I-shaped steel crossbeams 5, a bottom template 7 and a side template 8 of No. 0 segments are arranged on the component force bent frame 6, a bottom die water bag 9 is arranged on the bottom template 7, a bottom die water filling port 10 is arranged on the bottom die water bag 9, a bottom die water filling pipe 11 is connected on the bottom die water bag filling port 10, a bottom die water bag water injection pump 12 is connected to the bottom die water bag water injection pipe 11, a bottom die water bag water injection flowmeter 13 is arranged on the bottom die water bag water injection pipe 11, a left water bag string bag 15 is hung and connected to the left I-shaped steel cross beam 5 of the pier body, a left water bag 14 is arranged in the left water bag string bag 15, a left water bag water injection port 16 is arranged on the left water bag 14, a left water bag water injection pipe 17 is connected to the left water bag water injection port 16, a left water bag water injection pump 18 is connected to the left water bag water injection pipe 17, and a left water bag flowmeter 19 is arranged on the left water bag water injection pipe 17; hang on pier shaft right side I-steel crossbeam 5 and connect right side water bag string bag 21, be provided with right side water bag 20 in right side water bag string bag 21, be provided with right side water bag water filling port 22 on right side water bag 20, be connected with right side water bag water injection pipe 23 on right side water bag water filling port 22, be connected with right side water bag water injection pump 24 on right side water bag water injection pipe 23, be provided with right side water bag flowmeter 25 on right side water bag water injection pipe 23.
A water quantity controller is arranged on the ground on one side of the bearing platform, and the water quantity controller is respectively and electrically connected with a bottom die water bag water injection pump 12, a bottom die water bag water injection flowmeter 13, a left side water bag water injection pump 18, a right side water bag water injection pump 24 and a right side water bag flowmeter 25; the bottom die water bag water injection pump 12, the left side water bag water injection pump 18 and the right side water bag water injection pump 24 are respectively communicated with the reservoir through various water inlet pipelines.
A static load preloading test method for a No. 0 segment bracket of a cast-in-place continuous beam comprises the following steps:
the method comprises the following steps that firstly, a bottom die water bag 9 is arranged on a bottom die plate 7, a bottom die water bag water injection port 10 is arranged on the bottom die water bag 9, a bottom die water bag water injection pipe 11 is connected onto the bottom die water bag water injection port 10, a bottom die water bag water injection pump 12 is connected onto the bottom die water bag water injection pipe 11, a bottom die water bag water injection flow meter 13 is arranged on the bottom die water bag water injection pipe 11, a left water bag string bag 15 is hung on a left I-shaped steel cross beam 5 of a pier body on the left side, a left water bag 14 is arranged in the left water bag string bag 15, a left water bag water injection port 16 is arranged on the left water bag 14, a left water injection pipe 17 is connected onto the left water bag water injection port 16, a left water bag water injection pump 18 is connected onto the left water bag water injection pipe 17, and a left water bag flow meter 19 is arranged on the left water bag water injection pipe 17; a right water bag string bag 21 is hung and connected on the right I-shaped steel beam 5 of the pier body, a right water bag 20 is arranged in the right water bag string bag 21, a right water bag water injection port 22 is arranged on the right water bag 20, a right water bag water injection pipe 23 is connected on the right water bag water injection port 22, a right water bag water injection pump 24 is connected on the right water bag water injection pipe 23, and a right water bag flowmeter 25 is arranged on the right water bag water injection pipe 23;
secondly, controlling a bottom die water bag water injection pump 12 to inject water into the bottom die water bag 9, enabling the weight of the injected water to be 30% of the total weight of the number 0 block section through a bottom die water bag water injection flow meter 13, and closing the bottom die water bag water injection pump 12 to stop injecting water;
thirdly, by controlling the left water bag water injection pump 18 and the right water bag water injection pump 24, water is injected into the left water bag 14 and the right water bag 20 at the same time, and by observing the left water bag flowmeter 19 and the right water bag flowmeter 25, the weight of the water in the left water bag 14 and the weight of the water in the right water bag 20 are increased simultaneously and equivalently to keep the balance of the load stress of the number 0 section template bracket 3, and when the total weight of the water in the bottom mold water bag 9 plus the water in the left water bag 14 plus the water in the right water bag 20 reaches 110% of the total weight of the number 0 section, the left water bag water injection pump 18 and the right water injection pump 24 are closed simultaneously;
fourthly, after pre-pressing for 48 hours, equivalently releasing water in the left water bag 14 and the right water bag 20 by controlling a water valve on the left water bag water injection pipe 17 and a valve on the right water bag water injection pipe 23 until the water is emptied, and then releasing the bottom die water bag 9 by a valve on the bottom die water bag water injection pipe 11 until the water is emptied;
fifthly, at an interval of 6 hours, injecting water into the bottom die water bag 9 by controlling the bottom die water bag water injection pump 12 again, enabling the weight of the injected water to be 30% of the total weight of the No. 0 block section through the bottom die water bag water injection flow meter 13, and closing the bottom die water bag water injection pump 12 to stop injecting water; controlling the left water bag water injection pump 18 and the right water bag water injection pump 24 to simultaneously inject water into the left water bag 14 and the right water bag 20, observing the left water bag flowmeter 19 and the right water bag flowmeter 25 to simultaneously increase the weight of the water in the left water bag 14 and the weight of the water in the right water bag 20 in equal amount so as to keep the balance of the load stress of the number 0 section template bracket 3, and simultaneously closing the left water bag water injection pump 18 and the right water bag water injection pump 24 until the total weight of the water in the bottom mold water bag 9 plus the water in the left water bag 14 plus the water in the right water bag 20 reaches 110% of the total weight of the number 0 section;
sixthly, after 24 hours of prepressing, equivalently releasing water in the left water bag 14 and the right water bag 20 by controlling a water valve on the left water bag water injection pipe 17 and a valve on the right water bag water injection pipe 23 until the water is emptied, and then releasing the bottom die water bag 9 by a valve on the bottom die water bag water injection pipe 11 until the water is emptied;
seventhly, stopping the load preloading work when the measured 48-hour accumulated settlement of the No. 0 segment bottom template 7 and the No. 0 segment template bracket 3 is less than 2 mm; and if the measured cumulative settlement of the section 0 bottom template 7 and the section 0 template bracket 3 in 48 hours is more than or equal to 2 mm, repeating the steps of the fifth step and the sixth step.
The bottom die water bag 9, the left side water bag 14 and the right side water bag 20 are all special pre-pressing water bags made of high-density polyethylene, can be folded and placed, are long in service life, the number of the left side water bag 14, the right side water bag 20 and the bottom die water bag 9 is determined according to pre-pressing load requirements, a PLC (programmable logic controller) can be arranged in the water quantity controller to accurately control a computer for water injection and water drainage, the loading process of the actual concrete pouring process can be simulated, equal-load pre-pressing is carried out, the loading weight is accurate, and control is easy.
Claims (1)
1. A static load preloading test method for a No. 0 segment bracket of a cast-in-place continuous beam comprises the following steps:
the method comprises the following steps that a bottom die water bag (9) is arranged on a bottom die plate (7), a bottom die water bag water injection port (10) is arranged on the bottom die water bag (9), a bottom die water bag water injection pipe (11) is connected to the bottom die water bag water injection port (10), a bottom die water bag water injection pump (12) is connected to the bottom die water bag water injection pipe (11), a bottom die water bag water injection flowmeter (13) is arranged on the bottom die water bag water injection pipe (11), a left water bag string bag (15) is hung on a left I-shaped steel beam (5) of a pier body, a left water bag (14) is arranged in the left water bag string bag (15), a left water bag water injection port (16) is arranged on the left water bag (14), a left water bag water injection pipe (17) is connected to the left water bag water injection port (16), a left water bag water injection pump (18) is connected to the left water bag pipe (17), and a left water bag flowmeter (19) is arranged on the left water bag water injection pipe (17); a right water bag string bag (21) is hung on an I-shaped steel cross beam (5) on the right side of the pier body, a right water bag (20) is arranged in the right water bag string bag (21), a right water bag water injection port (22) is arranged on the right water bag (20), a right water bag water injection pipe (23) is connected to the right water bag water injection port (22), a right water bag water injection pump (24) is connected to the right water bag water injection pipe (23), and a right water bag flowmeter (25) is arranged on the right water bag water injection pipe (23);
secondly, injecting water into the bottom die water bag (9) by controlling a bottom die water bag water injection pump (12), controlling the amount of injected water by a bottom die water bag water injection flow meter (13), and closing the bottom die water bag water injection pump (12) to stop injecting water when the amount of injected water reaches 30% of the total weight of the No. 0 block section;
thirdly, by controlling the left water bag water injection pump (18) and the right water bag water injection pump (24), water is injected into the left water bag (14) and the right water bag (20) at the same time, and the injected water amount is controlled by observing the left water bag flowmeter (19) and the right water bag flowmeter (25), so that the water amount weight in the left water bag (14) and the water amount weight in the right water bag (20) are increased in an equivalent manner at the same time, the load stress balance of the number 0 section template bracket (3) is kept, and when the total weight of the water amount in the bottom mold water bag (9) plus the water amount in the left water bag (14) plus the water amount in the right water bag (20) reaches 110% of the total weight of the number 0 section, the left water bag water injection pump (18) and the right water bag water injection pump (24) are closed at the same time;
fourthly, after pre-pressing for 48 hours, releasing the water in the left water bag (14) and the water in the right water bag (20) in an equivalent manner by controlling a water valve on the left water bag water injection pipe (17) and a valve on the right water bag water injection pipe (23) until the water in the left water bag (14) and the water in the right water bag (20) are completely released, and then releasing the water in the bottom die water bag (9) through a valve on the bottom die water bag water injection pipe (11) until the water is released;
fifthly, after 6 hours, injecting water into the bottom die water bag (9) by controlling a bottom die water bag water injection pump (12) and controlling the injected water quantity by a bottom die water bag water injection flow meter (13) so that the weight of the injected water quantity is 30% of the total weight of the number 0 block section, and closing the bottom die water bag water injection pump (12) to stop injecting water; controlling a left water bag water injection pump (18) and a right water bag water injection pump (24) to simultaneously inject water into the left water bag (14) and the right water bag (20), and observing a left water bag flowmeter (19) and a right water bag flowmeter (25) to simultaneously increase the weight of the water in the left water bag (14) and the weight of the water in the right water bag (20) in equal amount so as to keep the load stress balance of the number 0 section template bracket (3) until the total weight of the water in the bottom mold water bag (9) and the left water bag (14) and the water in the right water bag (20) reaches 110% of the total weight of the number 0 section, and simultaneously closing the left water bag water injection pump (18) and the right water bag water injection pump (24);
sixthly, after 24 hours of pre-pressing, equivalently releasing water in the left water bag (14) and water in the right water bag (20) until emptying by controlling a water valve on the left water bag water injection pipe (17) and a valve on the right water bag water injection pipe (23), and then releasing water in the bottom die water bag (9) until emptying by a valve on the bottom die water bag water injection pipe (11);
and seventhly, measuring the 48-hour accumulated settlement of the No. 0 section bottom template (7) and the No. 0 section template bracket (3), stopping the load preloading work if the accumulated settlement is less than 2 mm, and repeating the steps from the fifth step to the sixth step if the accumulated settlement is greater than or equal to 2 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810221716.2A CN108225896B (en) | 2018-03-18 | 2018-03-18 | Cast-in-place continuous beam No. 0 segment bracket static load preloading testing device and testing method |
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| CN201810221716.2A CN108225896B (en) | 2018-03-18 | 2018-03-18 | Cast-in-place continuous beam No. 0 segment bracket static load preloading testing device and testing method |
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| CN109024285A (en) * | 2018-07-09 | 2018-12-18 | 贵州新联爆破工程集团有限公司 | A kind of continuous beam suspended bracket construction precompressed loading device |
| CN109436188A (en) * | 2018-10-24 | 2019-03-08 | 上海外高桥造船有限公司 | It goes on board gangway ladder ballast test method |
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| CN104264592B (en) * | 2014-10-14 | 2016-08-24 | 中国水利水电第四工程局有限公司 | A kind of continuous beam construction method |
| CN105369738B (en) * | 2015-10-08 | 2017-01-25 | 武汉一冶建筑安装工程有限责任公司 | Prepressing method of flushing type bridge rubber raft |
| CN205999802U (en) * | 2016-06-16 | 2017-03-08 | 中铁建大桥工程局集团第三工程有限公司 | A kind of continuous bridge zero number section, the new prepressing device of Cast-in-place Segment Support |
| CN106400689A (en) * | 2016-09-13 | 2017-02-15 | 陈凯 | Sealed water bag prepressing construction technology |
| CN206298833U (en) * | 2016-12-18 | 2017-07-04 | 中铁二十局集团第五工程有限公司 | A kind of pre- ballasting system of continuous rigid frame bridge |
| CN107012795A (en) * | 2017-05-22 | 2017-08-04 | 中国铁建大桥工程局集团有限公司 | A kind of continuous bridge pre-pressing bracket device and its construction method |
| CN208383572U8 (en) * | 2018-03-18 | 2019-04-26 | 中铁十九局集团第三工程有限公司 | No. 0 segment bracket static loading prepressing test device of cast-in-situ continuous beam |
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