CN220960528U - Reciprocating load loading device for seismic test of shield segment joints - Google Patents

Abstract

The utility model discloses a reciprocating load loading device for a shield segment joint shock resistance test, which comprises a test frame, an upper joint member, a lower joint member, a vertical jack, an upper hinge support, a lower hinge support, a transverse actuator, an upper clamp, a lower clamp and a connecting hinge, wherein the upper joint member is positioned right above the lower joint member, the vertical jack is positioned right above the upper joint member, the upper clamp is arranged at the periphery of the lower end of the upper joint member and clamps the upper joint member, the lower clamp is arranged at the periphery of the upper end of the lower joint member and clamps the lower joint member, a transverse actuating head of the transverse actuator is connected with the middle part of a '匚' shaped connecting rod, and two ends of the '匚' shaped connecting rod are respectively connected with the upper clamp and the lower clamp through two connecting hinges. The utility model can simulate vibration environments such as earthquakes more realistically, and can adjust loading parameters according to the needs, thereby obtaining good anti-seismic test effect of the shield segment joint.

Description

Reciprocating load device for seismic test of shield segment joints

Technical Field

The utility model relates to a shield segment joint load loading device, in particular to a reciprocating load loading device used for a shield segment joint seismic test.

Background technique

Due to the complex and changeable construction environment of shield tunnels and the constraints of technical conditions, the lining structure during operation must withstand multiple external forces such as soil pressure, water pressure, ground load, groundwater level changes, train impact, earthquakes, etc. These external forces will change the stress state of the lining structure, resulting in varying degrees of damage to the lining structure, such as concrete shedding, joint leakage, segment cracks, joint misalignment and opening. Especially under seismic loads, the segment joints will experience a reciprocating motion, and it is very necessary to explore the mechanical properties of the joints under this load.

At present, there are many static studies on segment joints. Generally, different loads are continuously applied through a hydraulic press until the specimen fails. However, under the action of an earthquake, the load on the structure is a load with a frequency. The hydraulic press can only control the size of the load in one direction. Even if a hydraulic press is placed on each side, it is difficult to control the frequency of the force and it is difficult to simulate the earthquake vibration load.

In the traditional dynamic research of segment joints, the reciprocating load loading device with an actuator as the reciprocating power is a more advanced test device. For example, the invention application with the patent number "201911317205.1" and the name "A three-way loaded segment joint mechanical properties test device" has a vertical actuator installed in the middle of the crossbeam of the main reaction frame, and a horizontal actuator installed at the lower part of the vertical beam on one side. The main reaction frame, the vertical actuator and the horizontal actuator together form a two-way loading self-balancing structure to apply vertical and horizontal loads to the segment joint specimen; the longitudinal reaction support It is connected to the translation guide base through a translation device, and a longitudinal actuator is installed in the longitudinal reaction force bracket. The longitudinal reaction force bracket and the longitudinal actuator together constitute a longitudinal loading self-balancing structure to apply a longitudinal load to the segment joint specimen; the vertical actuator, the horizontal actuator, and the longitudinal actuator can independently control the extension or retraction in the vertical, horizontal, and longitudinal directions, respectively, thereby applying loads in the vertical, horizontal, and longitudinal directions, or loads in the vertical and horizontal directions, to the segment joint specimen, so that the segment joint specimen can make corresponding movements under the required load and displacement boundary conditions.

Although the above invention application can apply reciprocating power to the pipe segment joints from multiple directions, it still has the following defects: on the one hand, in actual applications, the two pipe segments are subjected to other external forces, such as the reciprocating power generated by earthquakes, under the premise of bearing a certain static pressure, so the device cannot simulate the impact of earthquakes and other conditions on the pipe segment joints; on the other hand, the actuator power of the device is directly applied to the pipe segment, rather than to the pipe segment joints, which has little effect on the seismic test effect of the pipe segment joints.

Utility Model Content

The utility model aims to solve the above problems and provide a reciprocating load loading device for seismic test of shield segment joints.

The utility model achieves the above-mentioned purpose through the following technical solutions:

A reciprocating load loading device for seismic test of shield segment joints, comprising a test frame, an upper joint component and a lower joint component, and also comprising a vertical jack, an upper hinge support, a lower hinge support, a lateral actuator, an upper clamp, a lower clamp and a connecting hinge, wherein the vertical lower joint component is installed at the bottom of the test frame through the lower hinge support, the vertical upper joint component is located directly above the lower joint component, the vertical jack is installed at the upper part of the test frame and directly above the upper joint component, and the upper hinge support is installed Between the lower end of the top rod of the vertical jack and the upper end of the upper joint member, the upper clamp is installed on the outer periphery of the lower end of the upper joint member and clamps the upper joint member, the lower clamp is installed on the outer periphery of the upper end of the lower joint member and clamps the lower joint member, the transverse actuator is installed in the middle of the test frame through a hinge seat, the transverse actuating head of the transverse actuator is connected to the middle of the "匚"-shaped connecting rod, and the two ends of the "匚"-shaped connecting rod are respectively connected to the upper clamp and the lower clamp through the two connecting hinges.

Preferably, in order to achieve an active connection between the two joint members and the lateral actuator and facilitate assembly, the upper clamp comprises two vertical upper clamps and a plurality of transverse upper connecting bolts, the two upper clamps are respectively located on opposite sides of one direction of the lower end of the upper joint member, and the plurality of upper connecting bolts are respectively located on opposite sides of another direction of the lower end of the upper joint member, and the two ends of the plurality of upper connecting bolts respectively pass through corresponding through holes on the two upper clamps and are locked by nuts; the lower clamp comprises two vertical lower clamps and a plurality of transverse lower connecting bolts, the two lower clamps are respectively located on opposite sides of one direction of the upper end of the lower joint member, and the plurality of lower connecting bolts are respectively located on opposite sides of another direction of the upper end of the lower joint member, and the two ends of the plurality of lower connecting bolts respectively pass through corresponding through holes on the two lower clamps and are locked by nuts; each of the connecting hinges is respectively connected to the upper connecting bolt and the lower connecting bolt on the same side.

The beneficial effects of the utility model are:

The utility model applies reciprocating force to the joints of two joint components for simulating shield segments while applying static pressure between the two joint components, and transmits the reciprocating force to the connecting ends of the two joint components through the hinge connection structure, so as to simulate the vibration environment such as earthquake more realistically, and can adjust the loading parameters such as load size, frequency, amplitude, etc. as needed to achieve different loading modes and obtain good shield segment joint seismic test results; sensors such as strain gauges or displacement meters can also be installed at the joint position to measure the strain, displacement, rotation angle and other parameters of the joint component in real time, so as to calculate the bending stiffness, shear stiffness, tensile stiffness, hysteresis curve and other indicators of the joint component, and provide a reference for the design and optimization of the segment joint.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the three-dimensional structure of the reciprocating load loading device for the seismic test of shield segment joints according to the utility model;

FIG2 is a schematic diagram of the front view of the reciprocating load loading device for the seismic test of shield segment joints according to the utility model;

3 is a schematic diagram of the right side structure of the reciprocating load loading device for seismic test of shield segment joints according to the utility model.

Detailed ways

The utility model is further described below in conjunction with the accompanying drawings:

As shown in Figures 1 to 3, the reciprocating load loading device for the seismic test of shield segment joints of the utility model includes a test frame 1, an upper joint member 8, a lower joint member 17, a vertical jack 5, an upper hinge support 7, a lower hinge support 18, a transverse actuator 4, an upper clamp, a lower clamp and a connecting hinge 10. The vertical lower joint member 17 is installed at the bottom of the test frame 1 through the lower hinge support 18, the vertical upper joint member 8 is located directly above the lower joint member 17, and the vertical jack 5 is installed on the upper part of the test frame 1 and is located directly above the upper joint member 8. The upper hinge support 7 is installed between the lower end of the top rod of the vertical jack 5 and the upper end of the upper joint member 8, the upper clamp is installed on the outer periphery of the lower end of the upper joint member 8 and clamps the upper joint member 8, the lower clamp is installed on the outer periphery of the upper end of the lower joint member 17 and clamps the lower joint member 17, the transverse actuator 4 is installed in the middle of the test frame 1 through the hinge seat 3, the transverse actuating head 6 of the transverse actuator 4 is connected to the middle of the "匚"-shaped connecting rod 9, and the two ends of the "匚"-shaped connecting rod 9 are respectively connected to the upper clamp and the lower clamp through two connecting hinges 10. The specific structure of the connecting hinge 10 here is determined according to actual needs, as long as it can meet the requirements of relatively rotatable movable connection. For example, the connecting hinge 10 in the figure includes a straight connecting rod and two connecting plates, each connecting plate fixes two upper connecting bolts 11 or two lower connecting bolts 12 together, the middle part of the straight connecting rod is rotatably connected to one end of the "匚"-shaped connecting rod 9 through a pin shaft, and the two ends of the straight connecting rod are respectively rotatably connected to the two connecting plates through a pin shaft, thus forming a connecting hinge 10.

Preferably, in order to realize the movable connection between the two joint members and the lateral actuator 4 and facilitate assembly, the upper clamp includes two vertical upper clamps 13 and a plurality of transverse upper connecting bolts 11, the two upper clamps 13 are respectively located on the opposite sides of one direction of the lower end of the upper joint member 8, and the plurality of upper connecting bolts 11 are respectively located on the opposite sides of the other direction of the lower end of the upper joint member 8, and the two ends of the plurality of upper connecting bolts 11 respectively pass through the corresponding through holes on the two upper clamps 13 and are locked by nuts; the lower clamp includes two vertical lower clamps 15 and a plurality of transverse lower connecting bolts 12, the two lower clamps 15 are respectively located on the opposite sides of one direction of the upper end of the lower joint member 17, and the plurality of lower connecting bolts 12 are respectively located on the opposite sides of the other direction of the upper end of the lower joint member 17, and the two ends of the plurality of lower connecting bolts 12 respectively pass through the corresponding through holes on the two lower clamps 15 and are locked by nuts; each connecting hinge 10 is respectively connected to the upper connecting bolt 11 and the lower connecting bolt 12 on the same side.

FIGS. 1 to 3 also show an actuator mounting plate 2 provided on the test frame 1 and used for mounting the lateral actuator 4, a waterproof seam 14 provided at the lower end of the upper joint member 8 and the upper end of the lower joint member 17, a bolt hand hole 16 provided at the lower part of the upper joint member 8 and the upper part of the lower joint member 17, and a support mounting plate 19 provided on the test frame 1 and used for mounting the lower hinge support 18, all of which are conventional adaptive structures.

As shown in Figures 1 to 3, when in use, a downward static pressure is first applied to the upper joint component 8 through the vertical jack 5, and then the lateral actuator 4 is controlled as needed to make its lateral actuator head 6 produce reciprocating vibrations of a set frequency and amplitude, and reciprocating forces are applied to the joints between the two upper joint components 8 and the lower joint component 17 respectively, and the reciprocating forces are respectively transmitted to the connecting ends of the two upper joint components 8 and the lower joint component 17 through the "匚"-shaped connecting rod 9 and the two connecting hinges 10, which can simulate vibration environments such as earthquakes more realistically.

The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims (2)

1. A reciprocating load loading device for seismic test of shield segment joints, comprising a test frame, an upper joint member and a lower joint member, characterized in that: it also comprises a vertical jack, an upper hinge support, a lower hinge support, a lateral actuator, an upper clamp, a lower clamp and a connecting hinge, the vertical lower joint member is installed at the bottom of the test frame through the lower hinge support, the vertical upper joint member is located directly above the lower joint member, the vertical jack is installed on the upper part of the test frame and is located directly above the upper joint member, the upper hinge The support is installed between the lower end of the top rod of the vertical jack and the upper end of the upper joint component, the upper clamp is installed on the outer periphery of the lower end of the upper joint component and clamps the upper joint component, the lower clamp is installed on the outer periphery of the upper end of the lower joint component and clamps the lower joint component, the transverse actuator is installed in the middle of the test frame through a hinge seat, the transverse actuating head of the transverse actuator is connected to the middle of the "匚"-shaped connecting rod, and the two ends of the "匚"-shaped connecting rod are respectively connected to the upper clamp and the lower clamp through the two connecting hinges. 2. The reciprocating load loading device for seismic testing of shield segment joints according to claim 1, characterized in that: the upper clamp comprises two vertical clamps and a plurality of transverse upper connecting bolts, wherein the two upper clamps are respectively located at opposite sides of one direction of the lower end of the upper joint member, and the plurality of upper connecting bolts are respectively located at opposite sides of the lower end of the upper joint member in another direction, and the two ends of the plurality of upper connecting bolts respectively pass through corresponding through holes on the two upper clamps and are locked by nuts; the lower clamp comprises two vertical lower clamps and a plurality of transverse lower connecting bolts, the two lower clamps are respectively located at opposite sides of one direction of the upper end of the lower joint member, and the plurality of lower connecting bolts are respectively located at opposite sides of the upper end of the lower joint member in another direction, and the two ends of the plurality of lower connecting bolts respectively pass through corresponding through holes on the two lower clamps and are locked by nuts; each of the connecting hinges is respectively connected to the upper connecting bolt and the lower connecting bolt on the same side.