CN211528093U - Segment joint direct shear test device capable of alternately loading shear force - Google Patents
Segment joint direct shear test device capable of alternately loading shear force Download PDFInfo
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- CN211528093U CN211528093U CN201922081153.4U CN201922081153U CN211528093U CN 211528093 U CN211528093 U CN 211528093U CN 201922081153 U CN201922081153 U CN 201922081153U CN 211528093 U CN211528093 U CN 211528093U
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Abstract
The utility model relates to a can load section of jurisdiction joint direct shear test device of shear force in turn, including the frame, be equipped with shear force loading unit in the frame and be used for pressing from both sides the section of jurisdiction fixture of tight test section of jurisdiction, shear force loading unit includes two sets of shear force loading mechanisms, and two sets of shear force loading mechanisms divide to be listed in the upper and lower both sides of section of jurisdiction target clamping position and lie in same one side of section of jurisdiction joint target clamping position. The utility model provides a test device adopts two sets of shear force loading mechanisms, can realize connecting the dynamic load in turn of positive and negative shear force to experimental section of jurisdiction, realizes the test of operating modes such as shield structure section of jurisdiction joint anti-seismic performance, and the analog architecture is accurate reliable, provides more comprehensive, accurate, economy, safety, reliable test data for design, construction, operation in shield tunnel.
Description
Technical Field
The utility model belongs to the technical field of tunnel engineering, especially, relate to a section of jurisdiction joint direct shear test device of loading shear force in turn.
Background
The shield method plays an important role in the current tunnel construction method, particularly in municipal and large-scale underwater tunnels and other projects. The shield segment is used as a lining structure of a shield tunnel, once the shield segment is damaged, the construction and operation of a project are seriously influenced, and the repair is very difficult, so that the research on the stress characteristic is very important; the segment joint is used as a connecting device and a weak link of the segment and is an object of important research. Under such a background, the research on the segment joint test is increasing in recent years, the research range is also increasing, and as the general segment joint loading test continues deeper, the segment joint direct shear test begins to become a new research point.
The existing joint test loading device simulates axial force of a duct piece by using horizontal thrust, applies vertical load to the duct piece joint through jacks on two sides of the duct piece joint, simulates bending moment of the duct piece joint, and further measures the bearing capacity and the bending resistance of the duct piece joint. Such devices are generally used for joint bending tests and are not suitable for joint direct shear tests. Part of the loading device designed for the direct shear test is changed aiming at the characteristics of the direct shear test, but the constraint condition of the test piece in an ideal state is still difficult to meet; the existing direct shear test loading device applies shearing force through a jack in a certain specific direction, only the shearing force can be applied to the duct piece from one direction, if the shearing force in the other direction needs to be applied, the duct piece must be disassembled firstly, the duct piece is overturned and then is installed again, and the alternating bending moment cannot be applied to the duct piece without gaps. Under the action of earthquake, the shearing directions of the joints of the segment joints under the action of earthquake waves are dynamically and alternately changed, so that the existing test device can not carry out the anti-seismic (direct shear) performance test of the segment joints under the action of the earthquake.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a duct piece joint direct shear test device of loading shear force in turn can solve prior art's partial defect at least.
The utility model relates to a can load section of jurisdiction joint direct shear test device of shear force in turn, which comprises a frame, be equipped with shear force loading unit in the frame and be used for pressing from both sides the section of jurisdiction fixture of tight test section of jurisdiction, shear force loading unit includes two sets of shear force loading mechanisms, and two sets of shear force loading mechanism lists in the upper and lower both sides of section of jurisdiction target clamping position and lie in same one side of section of jurisdiction joint target clamping position.
In one embodiment, the shear loading mechanism includes a vertical driving hydraulic cylinder with an output shaft vertical to the axial direction.
As one embodiment, a shear beam for contacting the test segment to transmit shear force is fixed to the shear output end of the lower shear loading mechanism.
As one embodiment, the segment clamping mechanism comprises a first force transmission seat and a second force transmission seat which are used for respectively clamping two axial ends of the test segment, the second force transmission seat and the two sets of shear force loading mechanisms are positioned on the same side of a segment joint target clamping position and are provided with a plurality of rolling members which are used for rolling friction type contact with the end part of the test segment, and the axial direction of each rolling member is horizontal and perpendicular to the horizontal arrangement direction between the first force transmission seat and the second force transmission seat.
In one embodiment, each of the rolling members is a steel roll member.
In one embodiment, the horizontal distance between the first force transmission seat and the second force transmission seat is adjustable.
In one embodiment, one of the force transmission seats is a fixed force transmission seat, and the other force transmission seat is a movable force transmission seat, and the movable force transmission seat is connected with an axial force loading unit;
or both the two force transmission seats are movable force transmission seats, one movable force transmission seat is connected with an axial force loading unit, and the other movable force transmission seat is correspondingly provided with a stroke end limiting baffle;
or the two force transmission seats are movable force transmission seats, and the two movable force transmission seats are connected with axial force loading units;
the movable force transmission seat is arranged on the rack in a sliding mode, and the sliding direction of the movable force transmission seat is parallel to the horizontal arrangement direction between the first force transmission seat and the second force transmission seat.
In one embodiment, the axial force loading unit includes a horizontal driving hydraulic cylinder in which the output shaft is in a horizontal direction.
As one embodiment, the segment clamping mechanism further comprises a segment vertical limiting unit, and the segment vertical limiting unit and the shear force loading unit are respectively arranged on two sides of the segment joint target clamping position along the horizontal direction.
The utility model discloses following beneficial effect has at least:
the utility model provides a test device adopts two sets of shear force loading mechanisms, can realize connecting the dynamic load in turn of positive and negative shear force to experimental section of jurisdiction, realizes the test of operating modes such as shield structure section of jurisdiction joint anti-seismic performance, and the analog architecture is accurate reliable, provides more comprehensive, accurate, economy, safety, reliable test data for design, construction, operation in shield tunnel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pipe sheet joint direct shear test device provided in an embodiment of the present invention;
fig. 2 is a schematic structural view of a reaction frame according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As fig. 1, the embodiment of the utility model provides a duct piece joint direct shear test device, which comprises a frame 1, be equipped with shear force loading unit and be used for pressing from both sides the section of jurisdiction fixture of tight experimental section of jurisdiction 2 in frame 1, shear force loading unit includes two sets of shear force loading mechanisms, and two sets of shear force loading mechanisms are listed in the upper and lower both sides of section of jurisdiction target clamping position and lie in same one side of section of jurisdiction joint target clamping position, also promptly: after experimental section of jurisdiction 2 is held by section of jurisdiction fixture, two sets of shear force loading mechanisms lie in the same one side of section of jurisdiction joint and lie in experimental section of jurisdiction 2's upper and lower both sides respectively.
The test device that this embodiment provided adopts two sets of shear force loading mechanisms, can realize the dynamic alternative loading to the positive and negative shear force of test section of jurisdiction 2 joint, realizes the test of working conditions such as shield structure section of jurisdiction joint anti-seismic performance, and the analog architecture is accurate reliable, provides more comprehensive, accurate, economy, safety, reliable test data for design, construction, operation of shield tunnel.
The upper shear loading mechanism can be arranged on the rack 1 through the portal frame 7 and is ensured to be positioned above the segment target clamping position.
In one embodiment, as shown in fig. 1, the shear loading mechanism below comprises a shear beam 62 for contacting the test segment 2 to transfer shear forces, and a shear output structure disposed on a side of the shear beam 62 remote from the segment target gripping location, the shear beam 62 being secured to a shear output end of the shear output structure. The surface of the shear beam 62 for directly contacting the test segment 2 is preferably a smooth surface, so that the purity of test conditions is ensured; the shear beam 62 is preferably arranged on the frame 1 in a sliding manner, so that the stability of the up-and-down operation is ensured, and the shear beam reliably contacts with the surface of the test segment 2; obviously, the sliding direction of the shear beam 62 is parallel to the vertical direction, and the output direction of the shear output structure is parallel to the vertical direction, which is used for driving the shear beam 62 to approach or depart from the test segment 2, i.e. whether the shear beam 62 is loaded or not is realized. The shear force is transmitted through the shear beam 62, and the accuracy of the test conditions is ensured by the surface contact mode of the shear beam 62 and the test segment 2. In an alternative embodiment, the shear loading mechanism above may also be configured with the shear beam 62, or its shear output end in direct contact with the trial tube sheet 2.
In one embodiment, the shear loading mechanism includes a vertical driving hydraulic cylinder 61 with an output shaft vertical to the axial direction; of course, linear driving devices such as air cylinders are also applicable to the present embodiment, and satisfy: the loading force can be conveniently adjusted, the loading device can be started and stopped immediately according to working conditions, gapless alternate loading of positive and negative shearing forces is realized, and operations such as duct piece disassembly, duct piece reinstallation and the like are not needed.
In this embodiment, the segment joint is preferably a shield segment longitudinal joint, that is, the connecting position between two segment plates corresponding to the shield segment longitudinal joint is understood to be the segment structure after splicing two adjacent segment plates as the test segment 2, and the two sets of shear force loading mechanisms are used for acting on the same segment plate, namely, are respectively arranged on the upper side and the lower side of the segment plate. Those skilled in the art know that the axial force/axial force applied to the test segment 2 corresponds to the extrusion force between two segment plates in the actual segment ring, which is perpendicular to the longitudinal seam of the segment, such as the extrusion force between the capping block and the adjacent block; if a straight-plate type segment plate is used as the segment plate for the test (which is set as a conventional test condition), the axial direction of the segment plate is parallel to the longitudinal direction thereof and perpendicular to the width direction thereof.
Foretell section of jurisdiction fixture is used for guaranteeing the stability of section of jurisdiction position when experimental to guarantee the accuracy of experimental structure. In one embodiment, the segment clamping mechanism comprises a segment axial limiting unit for axially limiting the test segment 2; the segment axial limiting unit comprises a first force transmission seat 31 and a second force transmission seat 32, wherein the first force transmission seat 31 and the second force transmission seat 32 are used for respectively clamping two axial ends of the test segment 2, namely are in contact with the two axial ends of the test segment 2, and the two force transmission seats are respectively arranged on two sides of a segment target clamping position along the horizontal direction; the second force transmission seat 32 is provided with a plurality of rolling members 321 which are in rolling friction contact with the end part of the test segment 2, and the axial direction of each rolling member 321 is horizontal and vertical to the horizontal arrangement direction between the first force transmission seat 31 and the second force transmission seat 32. Based on this structure, the relative frictional resistance between the corresponding side end of experimental section of jurisdiction 2 and the second biography power seat 32 is less, and this experimental section of jurisdiction 2 possesses the condition of taking place free vertical displacement for the second passes power seat 32, better simulation section of jurisdiction tip restraint condition to make experimental condition be close/simulate section of jurisdiction direct shear test's ideal condition state more, improve the accuracy and the reliability of experimental structure.
As for the rolling member 321, it can be a roller, in this embodiment, it is preferable to use a roller structure, for example, a row of steel rollers is arranged on the corresponding end of the second force transmission seat 32 from top to bottom, and the distance between two adjacent steel rollers is obviously smaller than the thickness of the test tube piece 2.
Further preferably, the horizontal distance between the first force transmission seat 31 and the second force transmission seat 32 is adjustable, so that the testing device can be suitable for direct shear tests of segment joints of shield segments with various specifications, and has good universality. The horizontal distance between the two can be manually adjusted, for example, a plurality of bolt installation positions are correspondingly arranged on the frame 1, and the distance adjustment is realized by the way that a bolt hole at the bottom of one force transmission seat is opposite to different bolt installation positions; obviously, the more preferable scheme is to adopt the mode of automatically regulated, and the remote control of being convenient for is high in security. Among them, there may be the following feasible design schemes: (1) one force transmission seat is a fixed force transmission seat, the other force transmission seat is a movable force transmission seat, and the movable force transmission seat is connected with an axial force loading unit; (2) the two force transmission seats are movable force transmission seats, one movable force transmission seat is connected with an axial force loading unit, and the other movable force transmission seat is correspondingly provided with a stroke end limiting baffle; (3) the two force transmission seats are movable force transmission seats, and the two movable force transmission seats are connected with axial force loading units. The movable force-transmitting seat is preferably slidably disposed on the frame 1 and has a sliding direction parallel to the horizontal arrangement direction between the first force-transmitting seat 31 and the second force-transmitting seat 32, for example, a roller or a traveling roller row (provided with corresponding track constraint) is disposed at the bottom of the movable force-transmitting seat.
Then, foretell activity passes power seat not only lies in can realizing above-mentioned interval regulatory function in order to be suitable for the shield structure section of jurisdiction of different specifications, still lies in contacting spacing and transmitting the effort of axial force loading unit to experimental section of jurisdiction 2, guarantees the effective restraint to experimental section of jurisdiction 2. And, based on above-mentioned structure, this test device not only can carry out section of jurisdiction joint direct shear test, has still possessed the experimental function of shield segment axial bearing capacity.
For the first force transmission seat 31 and the second force transmission seat 32, the following structures are preferably adopted: as shown in fig. 1, the force transmission seat includes a base 3 and a force transmission table 302, the base 301 is L-shaped, the force transmission table 302 is disposed at the L-shaped groove of the base 301 and horizontally extends out of the base 301, so that one end of the force transmission table 302 extending out of the base 301 is used for contacting with the end of the test segment 2, and the force transmission table 302 is in a substantially suspended state, especially the second force transmission seat 32 provided with a rolling member 321, where the rolling member 321 is disposed on the suspended force transmission table 302, so as to ensure that the test segment 2 has the purity of the condition of free vertical displacement relative to the second force transmission seat 32, and ensure the accuracy of the test condition.
For the connection between the power transmission platform 302 and the base 301, detachable connection modes such as bolt assembly (for example, high-strength bolt fixing) can be adopted, so that the specification of the power transmission platform 302 can be adjusted as required, and the condition requirements of shield segments with different specifications can be met.
In one embodiment, the axial force loading unit comprises a horizontal driving hydraulic cylinder 5 with an output shaft in a horizontal direction; of course, linear driving devices such as air cylinders are also applicable to the present embodiment, and satisfy: the loading force can be conveniently adjusted, and the operation of detaching the duct piece, reinstalling the duct piece and the like can be realized without opening or stopping the duct piece immediately according to the working condition.
Further preferably, as shown in fig. 1, the segment clamping mechanism further comprises a segment vertical limiting unit for limiting the test segment 2 in the vertical direction, so as to prevent the segment at the corresponding position from generating vertical displacement, and the segment vertical limiting unit and the shear force loading unit are respectively arranged at two sides of the segment joint target clamping position in the horizontal direction. Through the cooperation of the axial limiting unit of the duct piece and the vertical limiting unit of the duct piece, the duct piece constraint condition required by the direct shear test of the duct piece can be well simulated, the situations that the test duct piece 2 is subjected to additional bending moment and the like are reduced or avoided, and the test result is more accurate, real and reliable.
It should be noted that, due to the effect of the segment vertical limiting unit, a rolling friction type contact condition may also be set between the corresponding side end portions of the first force transmission seat 31 and the test segment 2, but more preferably, a conventional contact friction manner is adopted between the first force transmission seat 31 and the test segment 2, for example, the corresponding end portion of the first force transmission seat 31 (i.e., the end portion thereof close to the second force transmission seat 32) is a steel plate, and the constraint state of the test segment 2 can be better achieved through the synergistic effect of the first force transmission seat 31 and the segment vertical limiting unit.
As a preferred embodiment of this embodiment, as shown in fig. 2, the segment vertical limiting unit includes a reaction frame 4, where the reaction frame 4 includes a frame seat 41 installed on the frame 1, a lower bearing platform 43 used for abutting against the bottom end of the segment, and an upper bearing platform 42 used for abutting against the top end of the segment, and both the upper bearing platform 42 and the lower bearing platform 43 are disposed on the frame seat 41. Wherein, the interval between last bearing platform 42 and the lower bearing platform 43 is preferred adjustable, so as to satisfy the experimental requirement of the shield section of jurisdiction of different specifications, for example, set up vertical guide bar 44 on frame seat 41, it sets up the guiding hole to go up bearing platform 42 correspondence, vertical guide bar 44 passes and passes through the spacing fixed of bolt after last bearing platform 42, thereby, last bearing platform 42 by the dead weight and fall to with the contact of 2 tops of experimental section of jurisdiction after, can guarantee through the bolt on the vertical guide bar 44 that this goes up bearing platform 42 and bearing platform 43 down all with experimental section of jurisdiction 2 in close contact with, guaranteed the vertical spacing effect to experimental section of jurisdiction 2 corresponding position department promptly. In addition, if the axial direction of the test tube piece 2 is taken as the X direction (i.e. the horizontal arrangement direction of the two force transmission seats), in an alternative embodiment, the test tube piece 2 can be limited in the Y direction by two vertical guide rods 44, which will not be described in detail herein. In the structure shown in fig. 2, the bottom surface of the upper messenger 42 and the top surface of the lower messenger 43 are both flat.
The application method of the segment joint direct shear test device (namely the method for carrying out the segment joint direct shear test by adopting the segment joint direct shear test device) comprises the following steps:
(1) clamping the test segment 2 by a segment clamping mechanism;
(2) and (3) loading the shear force on the test segment 2 alternately from top to bottom through the two groups of shear force loading mechanisms, and acquiring the performance data when the segment joint bears the dynamic shear force.
In the step (1), the method may further include: axially limiting the test segment 2 through a segment axial limiting unit; the segment plate on one side of the segment joint is vertically limited through the segment vertical limiting unit. More specifically, the step may include: the piston of the horizontal driving hydraulic cylinder 5 extends out to apply horizontal thrust to the second force transmission seat 32, so that the rolling component 321 on the second force transmission seat 32 is contacted with the corresponding end of the test segment 2; the thrust is transmitted to the test segment 2 through the rolling member 321, and the test segment 2 is further horizontally displaced and the other end thereof abuts against the first force transmission seat 31. So, experimental section of jurisdiction 2 is lived by two biography power seat restraines in the horizontal direction to receive the thrust that comes from horizontal drive pneumatic cylinder 5, thereby realized the simulation that bears experimental section of jurisdiction 2 axial force.
In the step (2), the method may specifically include:
firstly, the piston of the upper vertical driving hydraulic cylinder 61 retracts, the piston of the lower vertical driving hydraulic cylinder 61 extends out and is propped against the shearing beam 62, and the force applied by the piston is transmitted to the test segment 2 through the shearing beam 62, so that the simulation of the positive shearing force borne by the joint of the test segment 2 is realized; until the set positive shear loading time is reached, the piston of the lower vertical driving hydraulic cylinder 61 retracts;
a piston of the upper vertical driving hydraulic cylinder 61 extends out and is pressed against the test segment 2, and the force applied by the piston is directly transmitted to the test segment 2, so that the simulation of the negative shearing force borne by the segment joint is realized; until the set negative shear loading time is reached, the piston of the upper vertical driving hydraulic cylinder 61 retracts;
and thirdly, repeating the steps of the first step and the second step, and alternately performing the first step and the second step to simulate the alternating loading of the positive shearing force and the negative shearing force on the pipe joint until the test is finished.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The segment joint direct shear test device capable of alternately loading shear force comprises a rack and is characterized in that a shear force loading unit and a segment clamping mechanism used for clamping a test segment are arranged on the rack, the shear force loading unit comprises two groups of shear force loading mechanisms, and the two groups of shear force loading mechanisms are respectively arranged on the upper side and the lower side of a segment target clamping position and are positioned on the same side of the segment joint target clamping position.
2. The segment joint direct shear test device capable of alternately loading shear force of claim 1, wherein: the shear force loading mechanism comprises a vertical driving hydraulic cylinder with an output shaft in the vertical axial direction.
3. The segment joint direct shear test device capable of alternately loading shear force of claim 1 or 2, wherein: and a shear beam for contacting the test segment to transfer shear force is fixed at the shear output end of the shear loading mechanism below.
4. The segment joint direct shear test device capable of alternately loading shear force of claim 1, wherein: the segment clamping mechanism comprises a first force transmission seat and a second force transmission seat which are used for respectively clamping two axial ends of a test segment, the second force transmission seat and two sets of shear force loading mechanisms are positioned at the same side of a segment joint target clamping position and are provided with a plurality of rolling components which are used for being in rolling friction type contact with the end part of the test segment, and the axial direction of each rolling component is horizontal and perpendicular to the horizontal arrangement direction between the first force transmission seat and the second force transmission seat.
5. The segment joint direct shear test device capable of alternately loading shear force of claim 4, wherein: each rolling member is a steel roller member.
6. The segment joint direct shear test device capable of alternately loading shear force of claim 4, wherein: the horizontal distance between the first force transmission seat and the second force transmission seat is adjustable.
7. The segment joint direct shear test device capable of alternately loading shear force of claim 6, wherein:
one force transmission seat is a fixed force transmission seat, the other force transmission seat is a movable force transmission seat, and the movable force transmission seat is connected with an axial force loading unit;
or both the two force transmission seats are movable force transmission seats, one movable force transmission seat is connected with an axial force loading unit, and the other movable force transmission seat is correspondingly provided with a stroke end limiting baffle;
or the two force transmission seats are movable force transmission seats, and the two movable force transmission seats are connected with axial force loading units;
the movable force transmission seat is arranged on the rack in a sliding mode, and the sliding direction of the movable force transmission seat is parallel to the horizontal arrangement direction between the first force transmission seat and the second force transmission seat.
8. The segment joint direct shear test device capable of alternately loading shear force of claim 7, wherein: the axial force loading unit comprises a horizontal driving hydraulic cylinder with an output shaft in the horizontal direction.
9. The segment joint direct shear test device capable of alternately loading shear force of claim 4, wherein: the segment clamping mechanism further comprises a segment vertical limiting unit, and the segment vertical limiting unit and the shear force loading unit are respectively arranged on two sides of the segment joint target clamping position along the horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922081153.4U CN211528093U (en) | 2019-11-27 | 2019-11-27 | Segment joint direct shear test device capable of alternately loading shear force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922081153.4U CN211528093U (en) | 2019-11-27 | 2019-11-27 | Segment joint direct shear test device capable of alternately loading shear force |
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| Publication Number | Publication Date |
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| CN211528093U true CN211528093U (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922081153.4U Active CN211528093U (en) | 2019-11-27 | 2019-11-27 | Segment joint direct shear test device capable of alternately loading shear force |
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| CN (1) | CN211528093U (en) |
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- 2019-11-27 CN CN201922081153.4U patent/CN211528093U/en active Active
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