CN102494907A - Static load test method for in-situ hanging basket - Google Patents
Static load test method for in-situ hanging basket Download PDFInfo
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- CN102494907A CN102494907A CN2011103634908A CN201110363490A CN102494907A CN 102494907 A CN102494907 A CN 102494907A CN 2011103634908 A CN2011103634908 A CN 2011103634908A CN 201110363490 A CN201110363490 A CN 201110363490A CN 102494907 A CN102494907 A CN 102494907A
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Abstract
The invention belongs to the technical field of prestressed concrete continuous rigid frame or continuous girder bridge cantilever pouring construction, and particularly relates to a static load test method for an in-situ hanging basket, which overcomes the shortcomings of high investment, many working procedures, long construction period and poor safety of an existing static load test method for a hanging basket. The static load test method includes the steps: placing H-beam on a flat region; oppositely and neatly placing two diamond primary trusses of the hanging basket on the paved H-beam; connecting the diamond primary trusses by connecting the front ends of the diamond primary trusses through a tension steel stranded wire; and fixing one end of each diamond primary truss through a tension anchorage device while tensioning the other end of each diamond primary truss through a jack to achieve the purpose of static load test. The static load test method has the advantages that static load test time is greatly shortened, cost is saved, and a bridge pier and substructures of a girder and a bridge are not damaged.
Description
Technical field
The invention belongs to the outstanding technical field of irritating construction of PSC continuous rigid frame or continuous bridge, be specifically related to a kind of original ground Hanging Basket Static Load Test Method.
Background technology
Advantages such as along with the fast development of communication, prestressed concrete continuous rigid-framed bridge is handsome in appearance with it, and bricklaying is few, and from heavy and light, cost is low, and span is big account for significant proportion in bridge.One of main construction techniques of this bridge type and prestressed concrete continuous beam bridge is a cantilever placing method, this technology use major equipment---Hanging Basket is widely used.And Hanging Basket is used for construction and must carries out static test, through its security performance of static test check with eliminate the Hanging Basket inelastic deformation after, could formally come into operation.The Static Load Test Method of existing Hanging Basket is conventional preloading method; Be to place a large amount of sand pocket or concrete test block on the high-level Hanging Basket; In process of the test, be prone to cause unbalance loading and unstability, even can damage the beam body, have that investment is big, operation is many, long in time limit and shortcoming such as poor stability.
Summary of the invention
Goal of the invention of the present invention: the existing Hanging Basket Static Load Test Method existence of solution investment is big, operation is many, long in time limit and the shortcoming of poor stability.
The present invention realizes through following technical scheme:
A kind of original ground Hanging Basket Static Load Test Method, step is following:
The first step: in smooth region, three parallel keeping flat on the ground of H shaped steel;
Second step: with two rhombus main couples of Hanging Basket back to, entirely be positioned on the H shaped steel of laying, the back anchor point of Hanging Basket adopts fining twisted steel to connect, back anchor point is pressed three of force request layouts; Adopt support shaped steel to support behind two rhombus main couples between the free bearing, two preceding free bearings of rhombus truss all utilize the movable carriage of Hanging Basket, adopt hydraulic jack to support between two movable carriage; Hanging Basket insurance anchor point place adopts fining twisted steel to connect; At the front end of rhombus truss, promptly Hanging Basket front beam place utilizes the stretch-draw steel strand wires to connect; One end is fixed with tension ground tackle, and an other end utilizes lifting jack to carry out stretch-draw;
The 3rd step: measure the distance of two rhombus truss front ends, back anchor end before the stretch-draw,
The 4th step: with lifting jack slowly be loaded into the Hanging Basket rated load 20% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 50% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 75% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 90% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 100% after stop to load and keeping 30 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 110% after stop to load and keeping 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 120% after stop to load and keeping 5 minutes, measure the elongation of steel strand wires and the displacement of back anchor point;
The 5th step: with lifting jack slowly be unloaded to the Hanging Basket rated load 100% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 75% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 50% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 20% after stop unloading and kept 5 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; Stop unloading after lifting jack slowly is unloaded to 0 and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point;
The 6th step: the elongation of the steel strand wires that measure and the displacement and the design load of back anchor point are compared, draw experimental result.
Beneficial effect of the present invention: shortened the static test time greatly, practiced thrift cost, the substructure and the bridge pier of beam body, bridge all do not had damage.
Description of drawings
Fig. 1 is a synoptic diagram of the present invention
Among the figure: 1-H type shaped steel, 2-rhombus main couple, anchor point behind the 3-, the 4-fining twisted steel, 5-supports shaped steel, the 6-movable carriage, the 7-hydraulic jack, 8-insures anchor point, 9-stretch-draw steel strand wires, 10-stretch-draw anchor end, 11-jack tension end.
Embodiment
Original ground Hanging Basket Static Load Test Method, step is following:
The first step: near the building site, look for a more smooth region, spacing is parallel keeps flat on the ground by 3 to 5m spacings (look the Hanging Basket size and decide) with the H shaped steel of three long 12m, and its placement purpose is that two rhombus main couples for Diamond-Shape Form Traveler provide job platform;
Second step: on the smooth H shaped steel that is positioned over laying, anchor point adopts fining twisted steel to connect behind the Hanging Basket with two rhombus main couples of Hanging Basket, and back anchor is pressed force request and arranged three anchor points, adopts shaped steel to support behind two rhombus main couples between the free bearing.Two preceding free bearings of rhombus truss all utilize the movable carriage of Hanging Basket; Adopt the 100t hydraulic jack to support between two movable carriage; For guaranteeing the stable of two rhombus frame main trusses, can insure the anchor point place at Hanging Basket and adopt fining twisted steel to connect, utilize the stretch-draw steel strand wires to connect at the front end (being Hanging Basket front beam place) of rhombus truss; One end is fixed with tension ground tackle, and an other end utilizes lifting jack to carry out the stretch-draw (see figure 1);
The 3rd step: measure the distance of two rhombus truss front ends, back anchor end before the stretch-draw, and carry out observational record on request.
The 4th step: with lifting jack slowly be loaded into the Hanging Basket rated load 20% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 50% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 75% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 90% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 100% after stop to load and keeping 30 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 110% after stop to load and keeping 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 120% after stop to load and keeping 5 minutes, measure the elongation of steel strand wires and the displacement of back anchor point;
The 5th step: with lifting jack slowly be unloaded to the Hanging Basket rated load 100% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 75% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 50% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 20% after stop unloading and kept 5 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; Stop unloading after lifting jack slowly is unloaded to 0 and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point;
The 6th step: the elongation of the steel strand wires that measure and the displacement and the design load of back anchor point are compared, draw experimental result.
Method of the present invention just is the different of load mode and form with the key distinction of common Static Load Test Method.Promptly making an experiment the main stressed and crushed element (rhombus main couple) of Hanging Basket; Exert pressure through jack pair rhombus frame stress point; Its afterburning size is the half the of design load; Hanging Basket loads Hanging Basket with the stretching force form through back anchor, front steel strand wires, main truss and fulcrum lifting jack.The present invention makes an experiment in less smooth vacant lot, does not receive the influence of place, time and weather, and is harmless to the substructure of beam body and bridge, easy to operate, safe and reliable.
This experiment be with half of the heaviest beam section load as trial load, and load by its highest loading coefficient of 120%, through the stretch-draw of jack pair steel strand wires, reach the purpose of static test.Through the Mechanics Calculation of science, accomplish the application of force, power transmission and the counter force system structural design that load in this test, guarantee that each rod member is in stress preferably, and carry out the resistance to overturning inspection and calculate.
Adopting ground stretch-draw to send out method does the characteristics of Hanging Basket static test and is mainly reflected in following aspect:
1, simple in structure, rod member is stressed clear and definite, calculates easyly, only needs simple processing, is easy to adorn, tear open, and material therefor all can have enough to meet the need use.
2, add, unload quick, easy, easy operating at different levelsly adds, unloading force is clear and definite.If any special circumstances, can unload rapidly, can guarantee personnel's safety, avoid accident to take place.
3, do not receive the restriction of unbalance loading, can be separately two main couples of a Hanging Basket be carried out static test, and harmless to the substructure that becomes beam body and bridge, safe and reliable.
4, do not receive area, time and environmental restraint, free from environmental pollution, be beneficial to environmental protection.
5, avoid a large amount of preloading objects, saved manpower and materials, shortened the duration greatly, reduced engineering cost greatly.
6, be widely used, not only be suitable for the test of various forms Hanging Basket, and be specially adapted to many baskets are carried out static test, remarkable in economical benefits.
7, be applicable to the static test of various forms Hanging Basket.
Claims (1)
1. original ground Hanging Basket Static Load Test Method is characterized in that step is following:
The first step: in smooth region, three parallel keeping flat on the ground of H shaped steel;
Second step: with two rhombus main couples of Hanging Basket back to, entirely be positioned on the H shaped steel of laying, the back anchor point of Hanging Basket adopts fining twisted steel to connect, back anchor point is pressed three of force request layouts; Adopt support shaped steel to support behind two rhombus main couples between the free bearing, two preceding free bearings of rhombus truss all utilize the movable carriage of Hanging Basket, adopt hydraulic jack to support between two movable carriage; Hanging Basket insurance anchor point place adopts fining twisted steel to connect; At the front end of rhombus truss, promptly Hanging Basket front beam place utilizes the stretch-draw steel strand wires to connect; One end is fixed with tension ground tackle, and an other end utilizes lifting jack to carry out stretch-draw;
The 3rd step: measure the distance of two rhombus truss front ends, back anchor end before the stretch-draw,
The 4th step: with lifting jack slowly be loaded into the Hanging Basket rated load 20% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 50% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 75% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 90% after stop to load and keeping 20 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 100% after stop to load and keeping 30 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 110% after stop to load and keeping 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be loaded into the Hanging Basket rated load 120% after stop to load and keeping 5 minutes, measure the elongation of steel strand wires and the displacement of back anchor point;
The 5th step: with lifting jack slowly be unloaded to the Hanging Basket rated load 100% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 75% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 50% after stop unloading and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; With lifting jack slowly be unloaded to the Hanging Basket rated load 20% after stop unloading and kept 5 minutes, measure the elongation of steel strand wires and the displacement of back anchor point; Stop unloading after lifting jack slowly is unloaded to 0 and kept 10 minutes, measure the elongation of steel strand wires and the displacement of back anchor point;
The 6th step: the elongation of the steel strand wires that measure and the displacement and the design load of back anchor point are compared, draw experimental result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103634908A CN102494907A (en) | 2011-11-16 | 2011-11-16 | Static load test method for in-situ hanging basket |
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| CN2011103634908A CN102494907A (en) | 2011-11-16 | 2011-11-16 | Static load test method for in-situ hanging basket |
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| CN102494907A true CN102494907A (en) | 2012-06-13 |
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| CN2011103634908A Pending CN102494907A (en) | 2011-11-16 | 2011-11-16 | Static load test method for in-situ hanging basket |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048198A (en) * | 2012-12-27 | 2013-04-17 | 中铁港航局集团有限公司 | Load test method for rhombus hanging basket |
| CN104764618A (en) * | 2015-03-19 | 2015-07-08 | 重庆交通建设(集团)有限责任公司 | Bridge cantilevered casting hanging basket controllable equivalent pre-load testing method |
| CN114232497A (en) * | 2021-12-31 | 2022-03-25 | 中建桥梁有限公司 | Large-scale cable carries quick-witted counter-force pre-compaction device of crane |
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| CN2780817Y (en) * | 2004-03-04 | 2006-05-17 | 韩国假设材株式会社 | Folding erected support |
| JP2006292557A (en) * | 2005-04-12 | 2006-10-26 | Cb Service:Kk | Pressure resistance inspecting equipment of long container and pressure resistance inspecting method using it |
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| CN101982611A (en) * | 2010-10-21 | 2011-03-02 | 中铁四局集团建筑工程有限公司 | Jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction |
| CN102051858A (en) * | 2010-12-08 | 2011-05-11 | 四川路航建设工程有限责任公司 | Jack loading triangular truss hanging basket and load test construction method thereof |
| WO2011097994A1 (en) * | 2010-02-11 | 2011-08-18 | Zhou Qingqing | Foldable hanging basket |
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2011
- 2011-11-16 CN CN2011103634908A patent/CN102494907A/en active Pending
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| CN1337498A (en) * | 2000-08-03 | 2002-02-27 | 章启光 | In-situ support system and its construction method |
| CN2780817Y (en) * | 2004-03-04 | 2006-05-17 | 韩国假设材株式会社 | Folding erected support |
| JP2006292557A (en) * | 2005-04-12 | 2006-10-26 | Cb Service:Kk | Pressure resistance inspecting equipment of long container and pressure resistance inspecting method using it |
| CN201074301Y (en) * | 2007-08-02 | 2008-06-18 | 中国第一冶金建设有限责任公司 | Longitudinal moving apparatus for bearing trestle bridge segment box beam |
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| WO2011097994A1 (en) * | 2010-02-11 | 2011-08-18 | Zhou Qingqing | Foldable hanging basket |
| CN101982611A (en) * | 2010-10-21 | 2011-03-02 | 中铁四局集团建筑工程有限公司 | Jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048198A (en) * | 2012-12-27 | 2013-04-17 | 中铁港航局集团有限公司 | Load test method for rhombus hanging basket |
| CN104764618A (en) * | 2015-03-19 | 2015-07-08 | 重庆交通建设(集团)有限责任公司 | Bridge cantilevered casting hanging basket controllable equivalent pre-load testing method |
| CN104764618B (en) * | 2015-03-19 | 2017-11-21 | 重庆交通建设(集团)有限责任公司 | A kind of bridge cantilever pours the controllable equivalent advanced press load test method of Hanging Basket |
| CN114232497A (en) * | 2021-12-31 | 2022-03-25 | 中建桥梁有限公司 | Large-scale cable carries quick-witted counter-force pre-compaction device of crane |
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Application publication date: 20120613 |