CN107941601B - Loading mechanism of segment joint test device of shield tunnel structure - Google Patents
Loading mechanism of segment joint test device of shield tunnel structure Download PDFInfo
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- CN107941601B CN107941601B CN201711382547.2A CN201711382547A CN107941601B CN 107941601 B CN107941601 B CN 107941601B CN 201711382547 A CN201711382547 A CN 201711382547A CN 107941601 B CN107941601 B CN 107941601B
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- 238000012360 testing method Methods 0.000 title claims abstract description 94
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Physics & Mathematics (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The loading mechanism of the segment joint test device of the shield tunnel structure comprises L-shaped plates positioned at two sides of a test straight tube segment, wherein the L-shaped plates are overlapped at the middle part of an L-shaped beam of the test device and are bolted through bolts, the L-shaped plates are provided with vertical rib plate pairs which are perpendicular to a transverse plate and a vertical plate, and the rib plates of the vertical connecting plate are inserted in the vertical rib plate pairs and hinged with the vertical rib plate pairs; the ends of the two ends of the test straight pipe piece are widened front and back to form bulges, and the connecting plate is fixed at the ends of the test straight pipe piece by bolts penetrating through the bulges; the front part and the rear part of the L-shaped beam at the left end of the test straight pipe piece are embedded in the inverted L-shaped block and are connected through bolts; the right side of the inverted L-shaped block is bolted with the bottom of a left oil cylinder, the cylinder rod of the left oil cylinder is bolted with the left end of a connecting beam, and the right end of the connecting beam is bolted with an L-shaped beam at the right end of a test straight pipe piece. The loading mechanism can apply axial tension, expand the test range and enable the test result to be more accurate and reliable.
Description
Technical Field
The invention relates to a loading mechanism of a segment joint test device of a shield tunnel structure.
Background
The shield tunnel is largely adopted in the projects of urban subways, comprehensive pipe galleries, large-scale underwater tunnels and the like. The lining structure of the shield tunnel is formed by connecting shield segments through joints. The shield segment joint is used as a connecting device and a weak link of the segment and is easy to damage, and once the joint is damaged, the construction and operation of the engineering are seriously affected and the repair is very difficult. Therefore, the analysis and research of the stress characteristics of the segment joint are particularly important. The stress characteristics of the shield tunnel are usually tested through a segment joint test, so that test data are provided for the design, construction and operation of the shield tunnel.
The loading device for the conventional pipe piece joint test is characterized in that two ends of a test pipe piece are placed on an L-shaped plate, and the L-shaped plate is bolted on an L-shaped beam of the test device. During the test, the jack on the right side of the test device applies leftward thrust to the L-shaped beam on the right side so as to simulate the axial pressure of the pipe piece joint, and the jack above the test device applies vertical force to the pipe piece through the vertical stressing beam so as to simulate the bending moment of the pipe piece joint. It has the following two problems:
(1) Unreasonable in boundary treatment, the bottom plate upper surface of test segment and L shaped plate exists the contact, in the test process, because vertical force has been exerted, leads to the segment to exist great shear force in contact surface border position, makes the production shearing of segment destroy easily, and the atress of the pure curved state of segment is different with actual, leads to test result error big, the reliability is low.
(2) The horizontal jack is used for applying horizontal thrust to simulate the axial pressure of the pipe piece, and the vertical jack is used for applying vertical force to simulate bending moment. But cannot apply axial tension. The test range is limited greatly, and the joint test of the segment under the axial tension cannot be performed.
Disclosure of Invention
The invention aims to provide a loading mechanism of a segment joint test device of a shield tunnel structure, which can enable the test of the segment joint test of the shield tunnel structure to be more accurate and reliable; and the axial tension can be applied during the test, and the test range is wider, so that more comprehensive, accurate and reliable test data are provided for the design, construction and operation of the shield tunnel.
The invention adopts the technical scheme that the loading mechanism of the segment joint testing device of the shield tunnel structure comprises a test straight segment, L-shaped beams at two ends of the testing device, an upper loading device of the testing device positioned above the test straight segment, and a right loading device of the testing device connected with the L-shaped beams at the right end; the L-shaped plates positioned on two sides of the test straight pipe piece are overlapped in the middle of the L-shaped beam of the test device and are bolted through bolts, and the test straight pipe piece is characterized in that:
the L-shaped plate is provided with a vertical rib plate pair which is perpendicular to the transverse plate and the vertical plate, and the rib plate of the vertical connecting plate is inserted in the vertical rib plate pair and hinged with the vertical rib plate pair; the ends of the two ends of the test straight pipe piece are widened front and back to form bulges, and the connecting plate is fixed at the ends of the test straight pipe piece by bolts penetrating through the bulges;
The front part and the rear part of the L-shaped beam at the left end of the test straight pipe piece are embedded in the inverted L-shaped block and are connected through bolts; the right side of the inverted L-shaped block is bolted with the bottom of a left oil cylinder, the cylinder rod of the left oil cylinder is bolted with the left end of a connecting beam, and the right end of the connecting beam is bolted with an L-shaped beam at the right end of a test straight pipe piece.
The working process and principle of the invention are as follows:
Realization of axial tension: when in test, the right loading device of the test device is closed, so that the cylinder rods of the left cylinders at the front part and the rear part are pushed out rightwards, the front part and the rear part of the right L-shaped beam are pushed by the connecting beams at the front part and the rear part, and the middle part of the right L-shaped beam pulls the test straight pipe rightwards by the right L-shaped plate; the left end of the test straight pipe piece is fixed in the middle of the left L-shaped beam through the L-shaped plate, so that the test straight pipe piece is subjected to rightward axial tension, and the working condition that the pipe piece is subjected to the axial tension is simulated.
Realizing the bending moment of the joint: the upper loading device of the test device applies downward thrust to the middle part of the test straight pipe piece during the test, and as the two ends of the test straight pipe piece are in a hinged structure, the two sides can rotate at will, so that the joint position of the middle part of the test straight pipe piece is in a pure bending state (only bears bending moment and does not bear shearing force), and the working condition of forward bending moment (the lower surface of the pipe piece is pulled) suffered by the pipe piece joint can be completely simulated.
And simultaneously performing the two operations to simulate the pipe piece joint test in the pure bending state under the axial tension state.
Compared with the prior art, the invention has the beneficial effects that:
1. The test straight pipe piece is hinged with the L-shaped beam through the connecting plate, the bottom of the test straight pipe piece is suspended and is not contacted with any connecting piece, in the vertical loading process, the two sides of the pipe piece can rotate at will, no additional bending moment is generated, and the pipe piece joint cannot bear shearing force. Therefore, the joint position of the test straight pipe piece is in a pure bending state (only bears bending moment and does not bear shearing force), and the forward bending moment (the lower surface of the pipe piece is pulled) born by the pipe piece joint can be completely simulated to be closer to the actual stress state of the pipe piece joint. The test result is more real, accurate and reliable.
2. The axial tension loading device formed by the left oil cylinder, the L-shaped connecting block and the connecting beam realizes the application of axial tension load. The test device can simulate the working condition that the test straight pipe piece can bear axial tension, so that the tension condition of the pipe piece joint in special environments such as earthquake and the like can be tested, the test range of the test device is widened, and reliable test basis can be provided for the design, construction and operation of the shield pipe piece joint in the tension environment.
3. The two ends of the test straight pipe piece are widened to form bulges, the bolts for connecting the pipe piece are located at the front and rear bulge positions, and when the test is performed, the influence of the boundary on the main body part of the test straight pipe piece is small, so that the test result is more accurate and reliable.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
Fig. 1 is a schematic diagram of a front view structure of an embodiment of the present invention.
Fig. 2 is a schematic top view of an embodiment of the present invention.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Detailed Description
Examples
Figures 1-3 illustrate one embodiment of the present invention as follows: the loading mechanism of the segment joint test device of the shield tunnel structure comprises a test straight segment 5, L-shaped beams 1 at two ends of the test device, an upper loading device of the test device positioned above the test straight segment 5, and a right loading device of the test device connected with the L-shaped beams at the right end; the L-shaped plates 3 positioned on two sides of the test straight tube sheet 5 are overlapped at the middle part of the L-shaped beam 1 of the test device, and are bolted through bolts, and the test straight tube sheet is characterized in that:
The L-shaped plate 3 is provided with a vertical rib plate pair 3a which is vertical to the transverse plate and the vertical plate, and a rib plate 4a of the vertical connecting plate 4 is inserted into the vertical rib plate pair 3a and hinged with the vertical rib plate pair 3 a; the ends of the two ends of the test straight tube sheet 5 are widened front and back to form protrusions 5a, and the connecting plate 4 is fixed at the ends of the test straight tube sheet 5 by bolts penetrating through the protrusions 5 a;
The front part and the rear part of the L-shaped beam 1 at the left end of the test straight tube sheet 5 are embedded in the inverted L-shaped block 2 and are connected through bolts; the right side of the inverted L-shaped block 2 is bolted with the bottom of the left oil cylinder 6, the cylinder rod of the left oil cylinder 6 is bolted with the left end of the connecting beam 10, and the right end of the connecting beam 10 is bolted with the L-shaped beam 1 at the right end of the test straight pipe piece 5.
Claims (1)
1. The loading mechanism of the segment joint test device of the shield tunnel structure comprises a test straight segment (5), L-shaped beams (1) at two ends of the test device, an upper loading device of the test device positioned above the test straight segment (5) and a right loading device of the test device connected with the L-shaped beams at the right end; l-shaped plates (3) positioned on two sides of the test straight tube sheet (5), wherein the L-shaped plates (3) are superposed at the middle part of an L-shaped beam (1) of the test device, and are bolted through bolts, and the test straight tube sheet is characterized in that:
The L-shaped plate (3) is provided with a vertical rib plate pair (3 a) which is vertical to the transverse plate and the vertical plate, and the rib plate (4 a) of the vertical connecting plate (4) is inserted into the vertical rib plate pair (3 a) and hinged with the vertical rib plate pair (3 a); the ends of the two ends of the test straight tube sheet (5) are widened front and back to form protrusions (5 a), and the connecting plate (4) is fixed at the ends of the test straight tube sheet (5) by bolts penetrating through the protrusions (5 a);
The front part and the rear part of the L-shaped beam (1) at the left end of the test straight tube sheet (5) are embedded in the inverted L-shaped block (2) and are connected through bolts; the right side of the inverted L-shaped block (2) is bolted with the bottom of the left oil cylinder (6), the cylinder rod of the left oil cylinder (6) is bolted with the left end of the connecting beam (10), and the right end of the connecting beam (10) is bolted with the L-shaped beam (1) at the right end of the test straight pipe piece (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711382547.2A CN107941601B (en) | 2017-12-20 | 2017-12-20 | Loading mechanism of segment joint test device of shield tunnel structure |
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| CN201711382547.2A CN107941601B (en) | 2017-12-20 | 2017-12-20 | Loading mechanism of segment joint test device of shield tunnel structure |
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| CN107941601A CN107941601A (en) | 2018-04-20 |
| CN107941601B true CN107941601B (en) | 2024-05-28 |
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| CN201711382547.2A Active CN107941601B (en) | 2017-12-20 | 2017-12-20 | Loading mechanism of segment joint test device of shield tunnel structure |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632470B (en) * | 2018-12-11 | 2022-01-04 | 上海市基础工程集团有限公司 | Mechanical property test device for duct piece flat plate joint |
| CN109374432A (en) * | 2018-12-13 | 2019-02-22 | 西南交通大学 | The moment of flexure alternating loading device and method of shield duct piece connector experiment on flexural behavior machine |
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