CN101949778B - Cradle static loading test method - Google Patents
Cradle static loading test method Download PDFInfo
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- CN101949778B CN101949778B CN2010102533820A CN201010253382A CN101949778B CN 101949778 B CN101949778 B CN 101949778B CN 2010102533820 A CN2010102533820 A CN 2010102533820A CN 201010253382 A CN201010253382 A CN 201010253382A CN 101949778 B CN101949778 B CN 101949778B
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Abstract
The invention belongs to the technical field of prestressed concrete continuous rigid frame or continuous bridge suspended irrigation construction, in particular to a cradle static loading test method which solves the defects of big investment, long construction period and poor safety in the prior art. The cradle static loading test method comprises the following steps: respectively constructing two right triangle counter-force racks on the two webs of a formed concrete beam; respectively arranging two jacks below the two counter-force racks; after simultaneously and synchronously loading the two jacks to 20% of the rated load of a cradle slowly, stopping loading, and keeping for 20 minutes; measuring the sinking amount of the cradle and the dependent variable of a cradle stressed rod; then, successively and synchronously loading to 50%, 75%, 90%, 100%, 110% and 120% of the rated load of the cradle slowly, and then keeping for certain time; measuring the sinking amount; unloading stage by stage; and measuring the sinking amount of the cradle. The invention greatly shortens the cradle static loading test time, saves the cost and does not damage the lower-part structures of a beam body and a bridge girder as well as a pier.
Description
Technical field
The invention belongs to the outstanding technical field of irritating construction of prestressed concrete continuous rigid frame or continuous bridge, be specifically related to a kind of 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, after checking its security performance and eliminate the Hanging Basket inelastic deformation through static test, 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 water tank or sand pocket on the high-level Hanging Basket, in process of the test and easily 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
The invention provides a kind of Hanging Basket Static Load Test Method, solved prior art and had that investment is big, operation is many, long in time limit and the shortcoming of poor stability.
The present invention is achieved through the following technical solutions:
1, a kind of Hanging Basket Static Load Test Method is characterized in that may further comprise the steps:
The first step: distinguish pre-buried three block plates from top to bottom successively on two coxostermums that become beams of concrete of " returning " font at vertical profile, promptly go up pre-embedded steel slab, middle pre-embedded steel slab and following pre-embedded steel slab, and pre-buried last pre-embedded steel slab, middle pre-embedded steel slab and the horizontal symmetrical setting respectively of following pre-embedded steel slab on two coxostermums;
Second step: get four joist steel, first, two, three, four joist steel are becoming structure first right-angle triangle reaction frame and the bracing frame thereof on the side compound plate of beams of concrete, first joist steel is obliquely installed and an end and last pre-embedded steel slab weld together, the second joist steel along continuous straight runs setting and an end are welded together with following pre-embedded steel slab, again with first, the other end of two joist steel welds together, first, two joist steel and web are formed the first right-angle triangle reaction frame, the 3rd a joist steel along continuous straight runs setting and an end and middle pre-embedded steel slab weld together, the other end welds together with first joist steel as the hypotenuse of the first right-angle triangle reaction frame, one end and the middle pre-embedded steel slab of the 4th joist steel weld together, the other end welds together with second joist steel as the right-angle side of the first right-angle triangle reaction frame, and the 3rd joist steel and the 4th joist steel constitute the bracing frame of the first right-angle triangle reaction frame;
The 3rd step: becoming to be configured to second right-angle triangle reaction frame and the bracing frame thereof on another web of beams of concrete according to described method of second step;
The 4th step: the bed die distribution beam is hung in the bottom of the erecting by overhang of hanging on the Hanging Basket, on the bed die distribution beam end template is set, billet is set on end template, on the billet below the first right-angle triangle reaction frame, distribution beam under first lifting jack is set, between the distribution beam first lifting jack is being set under the first right-angle triangle reaction frame and first lifting jack, on the billet below the second right-angle triangle reaction frame, distribution beam under second lifting jack is set, between the distribution beam second lifting jack is being set under the second right-angle triangle reaction frame and second lifting jack, first lifting jack and second lifting jack are being linked together with separately oil hydraulic system respectively;
The 5th step: with first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 20% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 50% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 75% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 90% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 100% after stop to load and keeping 30 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 110% after stop to load and keeping 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 120% after stop to load and keeping 5 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod;
The 6th step: with first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 100% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 75% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 50% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 20% after stop unloading and kept 5 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; Stop unloading after first lifting jack and second lifting jack slowly be unloaded to 0 simultaneously synchronously and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod;
The 7th step: the deflection of the Hanging Basket that measures and the dependent variable and the design load of Hanging Basket force rod are compared, draw experimental result.
Method of the present invention just is the different of load mode with the key distinction of common Static Load Test Method, promptly Hanging Basket is regarded as a system with becoming the beam section, exert pressure by the reaction frame that the jack pair that is installed on the Hanging Basket base plate is linked on the beams of concrete section web, Hanging Basket by end anchor system, preceding hang be, main truss system and back anchor pass to the beam body again, thereby form a stress closed-loop path, with the loading of internal force balance realization to Hanging Basket.This method is only carried out local loading to beam body web, and is harmless to the substructure of beam body and bridge, need not pile heavily, easy to operate, safe and reliable.
The present invention is as test section with the heaviest beam section, and load by 120% the highest loading coefficient, becoming to be provided with on beam section two coxostermums loading precompressed counter-force carriage, and connect, keep resistance to overturning, lay lumps of wood buttress at the bottom of the Hanging Basket, and leveling, on add component joist steel framed bent, by 2 lifting jack, promptly every coxostermum place establishes one and exerts pressure and reach the purpose of static test.Static test serves as rationally with full simulation loading method in principle, promptly loads simultaneously on bed die, internal mold, external mold.But consider the actual conditions of building-site, in the test beam section load is added on the bed die entirely.By the Mechanics Calculation of science, finish 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.
The present invention adopts the internal force balance method to do the Hanging Basket static test, and its relative prior art has following beneficial effect:
1, simple in structure, rod member is stressed clear and definite, calculates easyly, and processing and manufacturing is simple, is easy to dress, tears open, is easy to have enough to meet the need.
2, add, unload quick, easy, easy operating at different levelsly adds, unload forces is clear and definite.If any special circumstances, can unload rapidly, can guarantee Hanging Basket and personnel's safety, avoid accident to take place.
3, be not subjected to the restriction of unbalance loading, can carry out static test to a Hanging Basket separately, and harmless to the substructure that becomes beam body and bridge, safe and reliable.
4, be not subjected to 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.
Description of drawings
Fig. 1 is the synoptic diagram of side-looking direction of the present invention
Fig. 2 is the synoptic diagram of master's apparent direction of the present invention
Among the figure: 1-has become beams of concrete, the last pre-embedded steel slab of 2-, pre-embedded steel slab among the 3-, pre-embedded steel slab under the 4-, 5-first joist steel, 6-the 3rd joist steel, 7-the 4th joist steel, 8-second joist steel, 9-first lifting jack, distribution beam under the 10-lifting jack, 11-billet, 12-end template, 13-bed die distribution beam, 14-cross member, 15-erecting by overhang, anchor behind the 16-, 17-Hanging Basket, 18-second lifting jack.
Embodiment
A kind of Hanging Basket Static Load Test Method may further comprise the steps:
The first step: vertical profile for every web of two webs that become beams of concrete of " returning " font on pre-buried successively from top to bottom three block plates, promptly go up pre-embedded steel slab 2, middle pre-embedded steel slab 3 and following pre-embedded steel slab 4, and pre-buried last pre-embedded steel slab, middle pre-embedded steel slab and the horizontal symmetrical setting respectively of following pre-embedded steel slab on two webs;
Second step: get four joist steel, with an end of first joist steel 5 and vertical profile for the last pre-embedded steel slab 2 of the web that becomes beams of concrete of " returning " font by being welded together, with an end of second joist steel 8 and vertical profile for the following pre-embedded steel slab 4 of the web that becomes beams of concrete of " returning " font by being welded together, the other end with first and second joist steel welds together again, first joist steel 5, second joist steel 8 is formed the first right-angle triangle reaction frame with the web that becomes beams of concrete, and second joist steel, the 8 along continuous straight runs settings of fixedlying connected with following pre-embedded steel slab 4, again with an end of the 3rd joist steel 6 and the middle pre-embedded steel slab 3 that is fixedly installed on the web that becomes beams of concrete by being welded together, the other end of the 3rd joist steel 6 welds together with first joist steel 5 as the hypotenuse of the first right-angle triangle reaction frame, with an end of the 4th joist steel 7 and the middle pre-embedded steel slab 3 that is fixedly installed on the web that becomes beams of concrete by being welded together, the other end of the 4th joist steel 7 and second joist steel 8 as the right-angle side of the first right-angle triangle reaction frame are welded together, and the 3rd joist steel 6 and the 4th joist steel 7 constitute the bracing frame of the first right-angle triangle reaction frame;
The 3rd step: is to be configured to second right-angle triangle reaction frame and the bracing frame thereof on another web that becomes beams of concrete of " returning " font according to described method of second step at vertical profile;
The 4th step: on the bed die distribution beam 13 that Hanging Basket is hung, end template 12 is set, on end template 12, billet is set, on the billet below the first right-angle triangle reaction frame, distribution beam under first lifting jack is set, first lifting jack 9 is being set between the distribution beam under the first right-angle triangle reaction frame and first lifting jack, on the billet below the second right-angle triangle reaction frame, distribution beam under second lifting jack is set, second lifting jack 18 is being set between the distribution beam under the second right-angle triangle reaction frame and second lifting jack, first lifting jack 9 and second lifting jack 18 are being linked together with separately oil hydraulic system respectively;
The 5th step: with first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 20% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 50% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 75% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 90% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 100% after stop to load and keeping 30 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 110% after stop to load and keeping 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 120% after stop to load and keeping 5 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod;
The 6th step: with first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 100% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 75% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 50% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 20% after stop unloading and kept 5 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; Stop unloading after first lifting jack and second lifting jack slowly be unloaded to 0 simultaneously synchronously and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod;
The 7th step: the deflection of the Hanging Basket that measures and the dependent variable and the design load of Hanging Basket force rod are compared, draw experimental result.
The present invention has shortened the static test time greatly, has saved cost, and the substructure and the bridge pier of beam body, bridge do not had damage.
Claims (1)
1. Hanging Basket Static Load Test Method is characterized in that may further comprise the steps:
The first step: on two coxostermums of vertical profile, distinguish pre-buried three block plates from top to bottom successively for the beams of concrete of one-tenth (1) of " returning " font, promptly go up pre-embedded steel slab (2), middle pre-embedded steel slab (3) and following pre-embedded steel slab (4), and pre-buried last pre-embedded steel slab, middle pre-embedded steel slab and the horizontal symmetrical setting respectively of following pre-embedded steel slab on two coxostermums;
Second step: get four joist steel, first, two, three, four joist steel are becoming structure first right-angle triangle reaction frame and the bracing frame thereof on the coxostermum of beams of concrete, first joist steel (5) is obliquely installed and an end and last pre-embedded steel slab (2) weld together, second joist steel (a 8) along continuous straight runs setting and an end are welded together with following pre-embedded steel slab (4), again with first, the other end of two joist steel welds together, first, two joist steel and web are formed the first right-angle triangle reaction frame, the 3rd joist steel (a 6) along continuous straight runs setting and an end and middle pre-embedded steel slab (3) weld together, the other end welds together with first joist steel (5) as the hypotenuse of the first right-angle triangle reaction frame, one end of the 4th joist steel (7) and middle pre-embedded steel slab (3) weld together, the other end welds together the bracing frame of the 3rd joist steel (6) and the 4th joist steel (7) the formation first right-angle triangle reaction frame with second joist steel (8) as the right-angle side of the first right-angle triangle reaction frame;
The 3rd step: becoming to be configured to second right-angle triangle reaction frame and the bracing frame thereof on another web of beams of concrete according to described method of second step;
The 4th step: bed die distribution beam (13) is hung in the bottom of the erecting by overhang of hanging on the Hanging Basket (15), end template (12) is set on the bed die distribution beam (13), billet (11) is set on end template (12), on the billet below the first right-angle triangle reaction frame, distribution beam under first lifting jack is set, first lifting jack (9) is being set between the distribution beam under the first right-angle triangle reaction frame and first lifting jack, on the billet below the second right-angle triangle reaction frame, distribution beam under second lifting jack is set, second lifting jack (18) is being set between the distribution beam under the second right-angle triangle reaction frame and second lifting jack, first lifting jack (9) and second lifting jack (18) are being linked together with separately oil hydraulic system respectively;
The 5th step: with first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 20% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 50% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 75% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 90% after stop to load and keeping 20 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 100% after stop to load and keeping 30 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 110% after stop to load and keeping 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be loaded into synchronously simultaneously the Hanging Basket rated load 120% after stop to load and keeping 5 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod;
The 6th step: with first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 100% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 75% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 50% after stop unloading and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; With first lifting jack and second lifting jack slowly be unloaded to synchronously simultaneously the Hanging Basket rated load 20% after stop unloading and kept 5 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod; Stop unloading after first lifting jack and second lifting jack slowly be unloaded to 0 simultaneously synchronously and kept 10 minutes, measure the deflection of Hanging Basket and the dependent variable of Hanging Basket force rod;
The 7th step: the deflection of the Hanging Basket that measures and the dependent variable and the design load of Hanging Basket force rod are compared, draw experimental result.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102533820A CN101949778B (en) | 2010-08-11 | 2010-08-11 | Cradle static loading test method |
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| CN2010102533820A CN101949778B (en) | 2010-08-11 | 2010-08-11 | Cradle static loading test method |
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| CN101949778B true CN101949778B (en) | 2011-10-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102004058A (en) * | 2010-10-18 | 2011-04-06 | 中铁十九局集团有限公司 | Suspended scaffolding static load test method |
| CN102425122A (en) * | 2011-12-26 | 2012-04-25 | 江苏省交通工程集团有限公司 | Asymmetric loading prepressing device for hanging basket for bridge cantilever casting construction |
| CN102912738B (en) * | 2012-11-07 | 2014-12-03 | 北京市公路桥梁建设集团有限公司 | Overall prepressing device for hanging basket |
| 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 |
| CN106702906A (en) * | 2016-12-09 | 2017-05-24 | 中铁八局集团昆明铁路建设有限公司 | Pre-pressing device for hanging baskets and pre-pressing method thereof |
| CN109682690B (en) * | 2019-01-22 | 2024-04-02 | 中铁十六局集团第五工程有限公司 | Intelligent loading system for hanging basket simulation |
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| CN1217411A (en) * | 1998-11-10 | 1999-05-26 | 万剑啸 | Two-dimension suspension scaffold |
| US7703335B2 (en) * | 2007-09-07 | 2010-04-27 | Tandemloc, Inc. | Load test system |
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