CN105938067A - External loading type shield segment mechanical property testing machine and testing method thereof - Google Patents

External loading type shield segment mechanical property testing machine and testing method thereof Download PDF

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Publication number
CN105938067A
CN105938067A CN201610222773.3A CN201610222773A CN105938067A CN 105938067 A CN105938067 A CN 105938067A CN 201610222773 A CN201610222773 A CN 201610222773A CN 105938067 A CN105938067 A CN 105938067A
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CN
China
Prior art keywords
duct piece
shield duct
loading
testing machine
test
Prior art date
Application number
CN201610222773.3A
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Chinese (zh)
Inventor
马程昊
马庆松
秦会来
油新华
张伟
平洋
张清林
许国光
Original Assignee
中国建筑股份有限公司
北京中建柏利工程技术发展有限公司
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Application filed by 中国建筑股份有限公司, 北京中建柏利工程技术发展有限公司 filed Critical 中国建筑股份有限公司
Priority to CN201610222773.3A priority Critical patent/CN105938067A/en
Publication of CN105938067A publication Critical patent/CN105938067A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001Type of application of the stress
    • G01N2203/0003Steady
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means

Abstract

The invention discloses an external loading type shield segment mechanical property testing machine and a testing method thereof. The testing machine includes a loading frame, a hydraulic power system and a loading control system; the loading frame is arranged at the outer side of shield segments; a hydrocylinder of the hydraulic system acts on the shield segments and provides load for the shield segments; the loading control system is connected with the hydraulic power system and is used for controlling the load applying condition of the shield segments. The external loading type shield segment mechanical property testing machine and the testing method thereof provided by the invention adopt a split type loading frame and adopts an external loading manner, and can be applicable for tests of mechanical properties of the shield segments with different material types and sizes; and actual load conditions of the shield segments can be simulated, and a technical platform is provided for theory researches of the shield segments.

Description

External load formula shield duct piece testing machine for mechanical properties and test method

Technical field

The present invention relates to technical field of buildings, particularly relate to external load formula shield duct piece testing machine for mechanical properties and test method.

Background technology

At present, in China's subway sectional tunnel is built, widely used shield Method, shield duct piece is used widely in constructing metro tunnel.The construction costs of shield duct piece accounts for the 30%~45% of subway tunnel civil engineering total cost.Shield duct piece is not only the key structure in tunnel, is also the key factor affecting Tunnel Engineering cost.

If shield duct piece design is overly conservative, unnecessary waste can be caused, increase the cost of engineering;If shield duct piece design load is less than normal, then engineering is made to there is potential safety hazard.Therefore, it is necessary to the mechanical property of shield duct piece is tested accordingly, simulate real load situation, test the accordance of its every design objective.

At present, the test method of domestic shield duct piece is mainly model test, local test and short form test.Due to roughization and the discrete type of modeling material of model structure, the dimensional effect of local test and many ignore factor etc., all it is difficult to truly realize the simulation of the mechanical characteristic such as the detail characteristic to tunnel segment structure and structural bearing capacity, unstability, destructive characteristics.

Abroad, the test about lining cutting was done more.Especially in Japan, shield technique quickly grows and prostatitis, the technical merit Jun Chu world.In 2003, Japan carried out double round rectangular shield lining cutting 1:1 prototype test and research, it is proposed that a kind of new shield tunnel form of fracture, and this lining cutting is diplopore rectangle, and its lining cutting outer layer is steel structure, internal concrete perfusion, formed the lining cutting of a kind of combinative structure.

At home, within 1999, Shanghai Tunnel Engineering stock Co., Ltd's construction technology institute has successively carried out the model test (by the model of 1:3) of three through seam assemblings and three staggered joint erections to double round lining cutting, and test loads the loading scheme using 6 concentrated loadings.Owing to being the model test of 1:3, there are differences between result and the actual liner structure result in the case of actual loading of test.

Underground engineering system of Southwest Jiaotong University in 2008, has carried out prototype structure load test to yangtze river in nanjing tunnel big cross section shield tunnel lining segment under water.For big cross section shield tunnel lining structure feature under water, the prototype test loading method of tunnel segment structure (including seam construction and domain liner structure) is proposed, and independent research Multifunctional shield tunnel structure load test system, this system can carry out assembly and disassembly according to different demands, both duct piece connector mechanical test can have been carried out, successfully hydraulic pressure can be separated with soil pressure again, carry out the load test of pipe-plate lining structure.

Above-mentioned testing equipment is respectively provided with practical engineering project background, i.e. build, so most of testing equipment is removed after off-test the most for the practical problem solving generation in engineering project;The testing machine that testing equipment uses the pattern of 1:1 to build is little.This is disadvantageous to the research of the aspects such as shield duct piece version, section of jurisdiction computational methods, tunnel segment structure bearing mode, reinforcement of segment form and connected mode.

Building of shield duct piece testing machine for mechanical properties, has a following benefit:

(1) blank of domestic shield duct piece large-scale experiment equipment is made up, the means of abundant theoretical research, proof theory achievement in research;

(2) ability of duct pieces of shield tunnel 1:1 prototype test is formed, it is provided that revise shield duct piece design theory and the means of Optimization Design by 1:1 test;

(3) enterprise can be made to possess and to undertake the ability that shield duct piece connected mode optimizes, shield duct piece form of reinforcement optimizes, shield duct piece new material research and development (steel fiber reinforced concrete segment), shield duct piece physical dimension optimize;

(4) enterprise competitiveness in terms of Shield-bored tunnels project.

Summary of the invention

It is an object of the invention to for above-mentioned technical problem, provide external load formula shield duct piece testing machine for mechanical properties and test method, spliced loading frame, external load mode, it is applicable to the mechanical property test of the shield duct piece of different materials model and dimensions;Can simulate the real load situation of shield duct piece, the theoretical research for shield duct piece provides technology platform.

Technical scheme

For solving above-mentioned technical problem, the external load formula shield duct piece testing machine for mechanical properties that the present invention provides, including loading frame, hydraulic power system, Loading Control System.

Loading frame is arranged on the outside of shield duct piece;Hydraulic jack in hydraulic power system acts on shield duct piece, provides load for shield duct piece;Loading Control System is connected with hydraulic power system, and the load controlling shield duct piece applies situation.

Further, described loading frame includes radial bearing reaction steel truss, axial quenched and tempered steel reaction frame, bearing beam and loading beam;Bearing beam and loading beam are arranged on outside shield duct piece, and hydraulic jack acts on bearing beam and loading beam.

Further, the flat shape of described radial bearing reaction steel truss is dodecagon, its hoop use truss structural, vertically connected by angle point column, hoop with vertically spliced by high-strength bolt.

Further, described hydraulic power system includes 12 groups of Hydraulic Stations and hydraulic jack, and often group Hydraulic Station and three hydraulic jacks connect;The maximum thrust of hydraulic jack is 2000KN.

Further, described Loading Control System includes load transducer, displacement transducer, holding wire, control station, and wherein, load transducer is arranged on the end of hydraulic jack, and displacement transducer is arranged on the inside of hydraulic jack.

The test method of said external loaded type shield duct piece testing machine for mechanical properties, comprises the following steps:

S1, examines material type and the physical dimension of shield duct piece, determines test site and test type;

S2, according to the test parameters of shield duct piece, builds loading frame;

S3, in the disposed outside hydraulic power system of loading frame, at circumferentially disposed 12 load(ing) points of shield duct piece, and installs, debugs Loading Control System;

S4, is loaded to shield duct piece by Loading Control System;

S5, testing crew is by the control station collection in Loading Control System, analysis test data.

Further, in step s 4, the load mode of shield duct piece includes that radial equilibrium formula loads, the most uneven formula loads, and it is equal proportion multistage loadings.

The method have the benefit that

The external load formula shield duct piece testing machine for mechanical properties of present invention offer and test method, spliced loading frame, external load mode, be applicable to the mechanical property test of the shield duct piece of different materials model and dimensions;Can simulate the real load situation of shield duct piece, the theoretical research for shield duct piece provides technology platform.

Accompanying drawing explanation

Fig. 1 is external load formula shield duct piece testing machine for mechanical properties structural representation;

Fig. 2 is the radial bearing reaction steel truss top view of loading frame;

Fig. 3 is that radial equilibrium formula loads schematic diagram;

Fig. 4 is the most uneven loading schematic diagram;

Fig. 5 is shield duct piece three ring test vertical load(ing) point schematic diagram;

Fig. 6 is shield duct piece two ring test vertical load(ing) point schematic diagram;

Fig. 7 is that shield duct piece monocycle tests vertical load(ing) point schematic diagram.

Wherein:

1. loading frame;2. hydraulic power system;3. Loading Control System;4. shield duct piece;5. hydraulic jack.

Detailed description of the invention

Below in conjunction with specific embodiments and the drawings, external load formula shield duct piece testing machine for mechanical properties and the test method of the present invention are described in detail:

Fig. 1 is external load formula shield duct piece testing machine for mechanical properties structural representation, and it includes loading frame 1, hydraulic power system 2, Loading Control System 3.

Loading frame 1 is arranged on the outside of shield duct piece 4;Hydraulic jack 5 in hydraulic power system 2 acts on shield duct piece 4, provides load for shield duct piece 4;Loading Control System 3 is connected with hydraulic power system 2, and the load controlling shield duct piece 4 applies situation.

Loading frame 1 includes radial bearing reaction steel truss, axial quenched and tempered steel reaction frame, bearing beam and loading beam;Bearing beam and loading beam are arranged on outside shield duct piece 4, and hydraulic jack 5 acts on bearing beam and loading beam.

Fig. 2 is the radial bearing reaction steel truss top view of loading frame, and its flat shape is dodecagon, its hoop use truss structural, vertically connected by angle point column, hoop with vertically spliced by high-strength bolt.

Described hydraulic power system 2 includes 12 groups of Hydraulic Stations and hydraulic jack 5, and often group Hydraulic Station and three hydraulic jacks 5 connect;The maximum thrust of hydraulic jack 5 is 2000KN.

Described Loading Control System 3 includes load transducer, displacement transducer, holding wire, control station, and wherein, load transducer is arranged on the end of hydraulic jack 5, and displacement transducer is arranged on the inside of hydraulic jack 5.

The test method of external load formula shield duct piece testing machine for mechanical properties, comprises the following steps:

S1, examines material type and the physical dimension of shield duct piece 4, determines test site and test type;

Specifically, this testing machine can be used for the test of the shield duct piece of multiple physical dimension, and it is the most detailed, as shown in table 1.

Table 1 shield duct piece physical dimension is detailed

This testing machine can carry out three ring tests of shield duct piece, the test of bicyclo-testing machine monocycle.

S2, according to the test parameters of shield duct piece 4, builds loading frame 1;

Specifically, according to physical dimension and the test type of shield duct piece, building loading frame 1, the external load formula shield duct piece testing machine for mechanical properties shown in Fig. 1 is shield duct piece three ring test schematic diagram.

S3, in the disposed outside hydraulic power system 2 of loading frame 1, at circumferentially disposed 12 load(ing) points of shield duct piece 4, and installs, debugs Loading Control System 3;

S4, loads to shield duct piece 4 by Loading Control System 3;

In this step, the load mode of shield duct piece 4 includes that radial equilibrium formula loads, the most uneven formula loads, and it is equal proportion multistage loadings.

Fig. 3 is that radial equilibrium formula loads schematic diagram, and its maximum radial loading force is 2000KN × 12 group × 3;Fig. 4 is the most uneven loading schematic diagram, and its maximum load power is 2000KN, and minimum loading force is 500KN.

Fig. 5 is shield duct piece three ring test vertical load(ing) point schematic diagram, and Fig. 6 is shield duct piece two ring test vertical load(ing) point schematic diagram, and Fig. 7 is that shield duct piece monocycle tests vertical load(ing) point schematic diagram.During actual loaded, according to the load(ing) point shown in Fig. 5-7 in vertical proportionate relationship, calculate the load(ing) point on shield duct piece, carry out corresponding load applying.

The radial loaded power being carried on shield duct piece and the necessary equal proportion multistage loadings of axially loaded power, each loading 10KN, after loading completes, the quiet 1min that stops records related data, until being loaded onto pre-constant load.

S5, testing crew is by the control station collection in Loading Control System 3, analysis test data.

The external load formula shield duct piece testing machine for mechanical properties of present invention offer and test method, spliced loading frame, external load mode, be applicable to the mechanical property test of the shield duct piece of different materials model and dimensions;Can simulate the real load situation of shield duct piece, the theoretical research for shield duct piece provides technology platform.

The present invention is not limited to above-mentioned embodiment; anyone can draw other various forms of products under the enlightenment of the present invention; though but in its shape or structure, make any change, every have same as the present application or akin technical scheme, within all falling within protection scope of the present invention.

Claims (7)

1. external load formula shield duct piece testing machine for mechanical properties, it is characterised in that include loading frame (1), hydraulic power system (2), Loading Control System (3);Loading frame (1) is arranged on the outside of shield duct piece (4);Hydraulic jack (5) in hydraulic power system (2) acts on shield duct piece (4), provides load for shield duct piece (4);Loading Control System (3) is connected with hydraulic power system (2), and the load controlling shield duct piece (4) applies situation.
External load formula shield duct piece testing machine for mechanical properties the most according to claim 1, it is characterised in that described loading frame (1) includes radial bearing reaction steel truss, axial quenched and tempered steel reaction frame, bearing beam and loading beam;Bearing beam and loading beam are arranged on shield duct piece (4) outside, and hydraulic jack (5) acts on bearing beam and loading beam.
External load formula shield duct piece testing machine for mechanical properties the most according to claim 2, it is characterized in that, the flat shape of described radial bearing reaction steel truss is dodecagon, and its hoop uses truss structural, vertically connected by angle point column, hoop and vertically being spliced by high-strength bolt.
External load formula shield duct piece testing machine for mechanical properties the most according to claim 1, it is characterised in that described hydraulic power system (2) includes 12 groups of Hydraulic Stations and hydraulic jack (5), and often group Hydraulic Station and three hydraulic jacks (5) connect;The maximum thrust of hydraulic jack (5) is 2000KN.
External load formula shield duct piece testing machine for mechanical properties the most according to claim 1, it is characterized in that, described Loading Control System (3) includes load transducer, displacement transducer, holding wire, control station, wherein, load transducer is arranged on the end of hydraulic jack (5), and displacement transducer is arranged on the inside of hydraulic jack (5).
6. the test method of external load formula shield duct piece testing machine for mechanical properties described in any one in Claims 1 to 5, it is characterised in that comprise the following steps:
S1, examines material type and the physical dimension of shield duct piece (4), determines test site and test type;
S2, according to the test parameters of shield duct piece (4), builds loading frame (1);
S3, in the disposed outside hydraulic power system (2) of loading frame (1), at circumferentially disposed 12 load(ing) points of shield duct piece (4), and installs, debugs Loading Control System (3);
S4, loads to shield duct piece (4) by Loading Control System (3);
S5, testing crew is by the control station collection in Loading Control System (3), analysis test data.
External load formula shield duct piece testing machine for mechanical properties test method the most according to claim 6, it is characterized in that, in step s 4, the load mode of shield duct piece (4) includes that radial equilibrium formula loads, the most uneven formula loads, and it is equal proportion multistage loadings.
CN201610222773.3A 2016-04-12 2016-04-12 External loading type shield segment mechanical property testing machine and testing method thereof CN105938067A (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN106679909A (en) * 2016-12-16 2017-05-17 上海隧道工程有限公司 Shield segment test vertical loading device
CN107941497A (en) * 2017-12-11 2018-04-20 同济大学 A kind of shield duct piece model test reaction frame
CN109001039A (en) * 2018-07-03 2018-12-14 上海隧道工程有限公司 Section of jurisdiction load and side cutting test loading equipemtn and its side cutting method
CN109612752A (en) * 2018-11-06 2019-04-12 宁波用躬科技有限公司 A kind of synchronous transportation system of polycyclic section of jurisdiction tunnel test unit and method
CN109738977A (en) * 2018-12-17 2019-05-10 中国科学院长春光学精密机械与物理研究所 The prestressing force loading structure of large departure aspheric surface mirror

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106679909A (en) * 2016-12-16 2017-05-17 上海隧道工程有限公司 Shield segment test vertical loading device
CN107941497A (en) * 2017-12-11 2018-04-20 同济大学 A kind of shield duct piece model test reaction frame
CN109001039A (en) * 2018-07-03 2018-12-14 上海隧道工程有限公司 Section of jurisdiction load and side cutting test loading equipemtn and its side cutting method
CN109001039B (en) * 2018-07-03 2020-10-27 上海隧道工程有限公司 Segment loading and lateral cutting test loading equipment and lateral cutting method thereof
CN109612752A (en) * 2018-11-06 2019-04-12 宁波用躬科技有限公司 A kind of synchronous transportation system of polycyclic section of jurisdiction tunnel test unit and method
CN109612752B (en) * 2018-11-06 2020-04-28 宁波用躬科技有限公司 Multi-ring segment tunnel test unit synchronous transportation system and method
CN109738977A (en) * 2018-12-17 2019-05-10 中国科学院长春光学精密机械与物理研究所 The prestressing force loading structure of large departure aspheric surface mirror

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