Shield tunnel lining segment multi-segment assembly bending test loading device

Abstract

The utility model provides a multi-segment splicing bending test loading device for shield tunnel lining segments, and belongs to the field of lining segment tests. The device comprises a door-shaped support and a to-be-detected segment unit, the to-be-detected segment unit is of an arc sheet structure formed by splicing a plurality of to-be-detected segments, the to-be-detected segment unit is arranged below the door-shaped support, and supporting plates abutting against the ends of the to-be-detected segment unit are arranged on the two sides of the bottom of the door-shaped support respectively. The two supporting plates are obliquely arranged towards the to-be-tested segment unit, a pressure loading mechanism is arranged on a top cross beam of the door-shaped support, and the pressure loading mechanism is configured to move towards the outer cambered surface of the to-be-tested segment unit. By adopting the multi-segment assembly bending test loading device for the shield tunnel lining segments, provided by the embodiment of the utility model, the problem that the accuracy of a test result is relatively low in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lining segment test, especially a kind of shield tunnel lining segment multi-segment assembly bending test loading device. BACKGROUND

[0002] Shield segment is the core assembly component of shield tunnel, is the permanent lining layer of tunnel structure, undertakes the key task of resisting stratum pressure, groundwater permeation and dynamic load (such as earthquake, traffic vibration) and other complex mechanical action. Its quality directly determines the overall stability of tunnel, waterproof performance and long-term durability. With the acceleration of urbanization process and the rapid development of underground space development, tunnel engineering scale is increasing (such as super diameter tunnel, deep buried high water pressure tunnel), and the demand for research on mechanical properties and synergistic effect of segment increases dramatically.

[0003] In the prior art, segment loading test is mostly focused on local performance test of single segment or joint, such as compression resistance, bending resistance and water tightness test, which can evaluate the monomer strength and sealing performance of segment, but ignores the synergistic deformation mechanism and overall structural response of joint after multi-segment assembly. Indoor scale model test cannot truly reflect the load transfer path of full-size segment due to insufficient material similarity and distorted boundary conditions. Although field prototype test is close to reality, it is high in cost, long in period and susceptible to environmental interference during data collection.

[0004] The segment test loading device in the prior art can usually only test single segment, and it is difficult to simulate the problems of segment misalignment, joint water seepage and local cracking caused by asymmetric load (such as uneven stratum hardness, construction eccentricity) after segment assembly. The traditional test mode only uses single segment test, which cannot find the problems caused by the interaction between segments, resulting in low accuracy of test results. UTILITY MODEL CONTENTS

[0005] The utility model embodiment provides a kind of shield tunnel lining segment multi-segment assembly bending test loading device, can solve the problem of low accuracy of test results in prior art. The technical solution is as follows:

[0006] A kind of shield tunnel lining segment multi-segment assembly bending test loading device, comprising: door type support and the segment unit to be measured,

[0007] The segment unit to be measured is the circular arc sheet structure that multiple segment units to be measured are fixedly spliced, the segment unit to be measured is arranged below the door type support, the bottom of the door type support is provided with the support plate that is respectively abutted with the end of the segment unit to be measured, two support plates are inclinedly arranged towards the segment unit to be measured,

[0008] The top crossbeam of the door type support is provided with a pressure loading mechanism configured to move towards the outer arc surface of the to-be-tested pipe piece unit.

[0009] Optionally, a steel support is arranged on the side of the support plate away from the to-be-tested pipe piece unit, the top of the support plate is hinged to the steel support, the steel support is provided with a first push rod near the side of the support plate, the end of the first push rod is in abutment with the support plate, and the first push rod is configured to move towards the support plate.

[0010] Optionally, the spacing of the two support plates in the horizontal direction is adjustable.

[0011] Optionally, a clamping mechanism is arranged on the to-be-tested pipe piece unit, the clamping mechanism comprises two clamping plates and a stud, the two clamping plates are arranged on the two sides of the to-be-tested pipe piece unit respectively, screw holes are formed in the clamping plates, and the stud is threadedly connected with the screw holes.

[0012] Optionally, the clamping plate is provided with a second push rod near the side of the to-be-tested pipe piece unit.

[0013] Optionally, a plurality of clamping mechanisms are arranged, and the plurality of clamping mechanisms are arranged at intervals in the arc direction of the to-be-tested pipe piece unit.

[0014] Optionally, the pressure loading mechanism is provided with a pad block at the bottom, and the pad block is in contact with the to-be-tested pipe piece unit.

[0015] Optionally, the pad block is provided with two pad blocks arranged at intervals.

[0016] The technical scheme provided by the embodiment of the utility model has at least the following beneficial effects:

[0017] The shield tunnel lining pipe piece multi-pipe piece assembling anti-bending test loading device provided by the embodiment of the utility model simulates the splicing state of the to-be-tested pipe piece in the actual application process by splicing a plurality of to-be-tested pipe pieces to form a to-be-tested pipe piece unit, provides support force for the to-be-tested pipe piece unit through the support plate, and applies pressure to the to-be-tested pipe piece unit through the pressure loading mechanism on the door type support, thereby breaking through the limitation of the traditional single pipe piece test, and the collaborative stress state of the to-be-tested pipe pieces after splicing can be restored more truly, the joint collaborative deformation mechanism of the actual tunnel lining can be simulated, the mechanical causes of diseases such as pipe piece misalignment and water seepage can be revealed more truly, more actual data support is provided for the optimization of pipe piece joint waterproofing and durability design, and the problem of low accuracy of test results in the prior art can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model;

[0020] Figure 2 This is a front view schematic diagram of the tube segment unit after removal from the present utility model embodiment;

[0021] Figure 3 This is a schematic diagram of the clamping mechanism provided in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the clamping plate structure provided in an embodiment of the present utility model.

[0023] In the figure: 1-Gate-shaped bracket; 2-Segment unit to be tested; 21-Segment to be tested; 3-Support plate; 4-Pressure loading mechanism; 41-Padded block; 5-Steel support; 51-First push rod; 6-Clamping mechanism; 61-Clamping plate; 62-Stud; 63-Screw hole; 64-Second push rod; 7-Base; 71-Slide rail; 72-Third push rod. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model; Figure 2 This is a front view schematic diagram of the tube segment unit after removal from the present utility model embodiment; Figure 3 This is a schematic diagram of the clamping mechanism provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the clamping plate structure provided in an embodiment of this utility model. Figures 1 to 4 The above describes a multi-segment assembly bending resistance test loading device for shield tunnel lining segments, comprising: a portal frame 1 and a segment unit 2 to be tested. The segment unit 2 is an arc-shaped structure formed by fixing and splicing multiple segments 21 to be tested. The segment unit 2 is located below the portal frame 1. Support plates 3 are respectively provided on both sides of the bottom of the portal frame 1, which abut against the ends of the segment unit 2 to be tested. The two support plates 3 are arranged at an inclination toward the segment unit 2 to be tested. A pressure loading mechanism 4 is provided on the top crossbeam of the portal frame 1. The pressure loading mechanism 4 is configured to move toward the outer arc surface of the segment unit 2 to be tested.

[0026] Exemplarily, in the embodiment of the utility model, the pipe piece unit 2 to be detected can be combined and spliced into different structure forms according to the structure and data to be detected, in the embodiment, the pipe piece unit 2 to be detected includes two complete pipe pieces 21 to be detected and two half pipe pieces 21 to be detected, the two half pipe pieces 21 to be detected are spliced in the direction of the arc and have the same length and shape as one complete pipe piece 21 to be detected, and the two complete pipe pieces 21 to be detected are respectively clamped on the two sides of the two half pipe pieces 21 to be detected to form the pipe piece unit 2 to be detected. The two ends of the pipe piece unit 2 to be detected combined are respectively placed on the support plate 3, and the support plate 3 provides the support force for the pipe piece unit 2 to be detected and the reaction force when the loading force is applied to the pipe piece unit 2 to be detected. By controlling the pressure loading mechanism 4 at the top of the door-shaped support 1 to apply the loading force to the outer arc surface of the pipe piece unit 2 to be detected, the multi-dimensional load coupling effect of the stratum lateral soil pressure, the vertical pressure and the construction longitudinal stress and the like can be simulated, compared with the traditional single-point or symmetrical loading, the technology is closer to the actual complex working condition (such as the asymmetric load of the soft and hard uneven stratum), and the bending resistance, the compression resistance and the deformation resistance of the pipe piece 21 to be detected can be comprehensively evaluated, the pressure sensor and the like data measuring device are arranged at each position of the pipe piece 21 to be detected and are used for measuring the stress condition and the deformation condition at each position. In the embodiment, the pressure loading mechanism 4 can be a jack that can be telescoped downward, and when the jack is lifted downward, the loading force can be provided for the pipe piece unit 2 to be detected. In the embodiment, the slide rail can be arranged on the crossbeam of the door-shaped support 1, and the pressure loading mechanism 4 can be slidably arranged on the slide rail, so that the action point of the loading force applied to the pipe piece unit 2 to be detected by the pressure loading mechanism 4 can be adjusted, and the test efficiency can be improved.

[0027] The utility model embodiment provides a kind of shield tunnel lining pipe piece multi-pipe piece splicing bending test loading device, and the pipe piece unit 2 to be detected is spliced to simulate the splicing state of pipe piece 21 to be detected in actual application process by multiple pipe pieces 21 to be detected, support plate 3 is provided for pipe piece unit 2 to be detected by support force, and then pressure loading mechanism 4 on door-shaped support 1 is applied to pipe piece unit 2 to be detected by pressure, break through the limitation of traditional single pipe piece test, so that the collaborative stress state after the splicing of multiple pipe pieces 21 to be detected can be more real and restore, simulate the joint collaborative deformation mechanism of actual tunnel lining, can more truly reveal the mechanical inducement of pipe piece misalignment, water seepage and other diseases, provide more actual data support for optimizing pipe piece joint waterproof, durability design, so as to effectively solve the problem of lower accuracy of test result in prior art.

[0028] Optionally, the support plate 3 is provided with a steel support 5 away from the pipe sheet unit 2 to be tested, the top of the support plate 3 is hinged to the steel support 5, the first push rod 51 is arranged on one side of the steel support 5 close to the support plate 3, the end of the first push rod 51 abuts against the support plate 3, and the first push rod 51 is configured to move towards the support plate 3.

[0029] Exemplarily, in the embodiment of the utility model, as shown in Figure 1 and Figure 2 , in order to facilitate the splicing of the pipe sheet 21 to be tested, the end of the pipe sheet 21 to be tested is usually flat during production. The first push rod 51 can also be driven by a hydraulic jack, so that the first push rod 51 moves towards the support plate 3, and since the top of the support plate 3 is hinged to the steel support 5, the support plate 3 rotates around the hinge point, thereby changing the inclination angle of the support plate 3. By changing the inclination angle of the support plate 3, the pipe sheet 21 to be tested with different radii can be arranged on the two support plates 3, so that the loading test can be performed on the pipe sheet 21 to be tested with multiple radii, thereby improving the compatibility of the device.

[0030] Optionally, the distance between the two support plates 3 in the horizontal direction is adjustable.

[0031] Exemplarily, in the embodiment of the utility model, as shown in Figure 1 and Figure 2 , a base 7 is arranged at the bottom of the door-shaped support 1, the support plate 3 is arranged obliquely on the base 7, a horizontal slide rail 71 is arranged on one side of the base 7, the slide rail 71 is arranged towards the other base 7, the steel support 5 is slidably arranged on the slide rail 71, a horizontal third push rod 72 is further arranged between the steel support 5 and the base 7, the third push rod 72 can also be driven by a hydraulic jack, and is used to push the steel support 5 to slide on the slide rail 71. By arranging this structure, when the steel support 5 slides on the slide rail, the distance between the two support plates 3 in the horizontal direction can be adjusted, so as to adapt to pipe sheets 21 to be tested with different lengths, thereby the test can be performed on more types of pipe sheets 21 to be tested, and the compatibility of the device is further improved.

[0032] Optionally, a clamping mechanism 6 is arranged on the pipe sheet unit 2 to be tested, the clamping mechanism 6 comprises two clamping plates 61 and studs 62, the two clamping plates 61 are arranged on the two sides of the pipe sheet unit 2 to be tested respectively, screw holes 63 are formed in the clamping plates 61, and the studs 62 are threadedly connected with the screw holes 63.

[0033] Exemplarily, in the embodiment of the utility model, as shown in Figure 1 , Figure 3 and Figure 4As shown, the two sides of the to-be-tested pipe piece unit 2 can be clamped and fixed in the direction by the clamping mechanism 6, so that the gap between the plurality of to-be-tested pipe pieces 21 is prevented from being generated when the loading force is applied to the to-be-tested pipe piece unit 2, and the test result is inaccurate. By arranging the clamping mechanism 6, the to-be-tested pipe piece unit 2 can be made to be closer to the stress state in the actual application, and the accuracy of the test result of the device is further improved. By adopting the threaded connection form of the stud 62 and the screw hole 63, the clamping mechanism 6 is also convenient to install or disassemble, and the operation convenience of the device is improved.

[0034] Optionally, the clamping plate 61 is provided with a second push rod 64 close to one side of the to-be-tested pipe piece unit 2.

[0035] Exemplarily, in the embodiment of the utility model, as shown in the figure, Figure 3 After the clamping mechanism 6 is installed on the to-be-tested pipe piece unit 2, the second push rod 64 is started to extend in the direction of the to-be-tested pipe piece 21, so that the sides of the plurality of to-be-tested pipe pieces 21 are more closely attached to each other, and the stress state of the to-be-tested pipe piece unit 2 is more attached to the actual application scene, and the accuracy of the test result of the device is further improved.

[0036] Optionally, a plurality of clamping mechanisms 6 are arranged, and the plurality of clamping mechanisms 6 are arranged along the arc direction of the to-be-tested pipe piece unit 2.

[0037] Exemplarily, in the embodiment of the utility model, as shown in the figure, Figure 1 By arranging a plurality of clamping mechanisms 6, the to-be-tested pipe piece unit 2 can be clamped and fixed at multiple positions, so that the stress state of the to-be-tested pipe piece unit 2 is more attached to the actual application scene, and the accuracy of the test result of the device is further improved.

[0038] Optionally, the pressure loading mechanism 4 is provided with a pad 41 at the bottom, and the pad 41 is in contact with the to-be-tested pipe piece unit 2.

[0039] Exemplarily, in the embodiment of the utility model, as shown in the figure, Figure 2 The pad 41 is arranged at the bottom of the pressure head of the pressure loading mechanism 4, so that the pressure loading mechanism 4 loads the to-be-tested pipe piece unit 2 through the pad 41. At this time, the pressure loading mode is single-point loading. By arranging the pad 41, the position of the pad 41 or the position of the pressure head can be adjusted, so that the to-be-tested pipe piece unit 2 is loaded at different positions, so that different tests can be carried out at multiple positions, and multiple test data can be obtained, and the accuracy of the test result of the device is further improved.

[0040] Optionally, the pad 41 is provided with two pads 41 arranged at intervals.

[0041] Exemplarily, in the embodiment of the utility model, as shown in the figure,Figure 2 As shown, when the two pads 41 are provided, the pressure loading mode is two-point loading, the pad 41 is detachably connected with the pressure head of the pressure loading mechanism 4, and the single-point loading mode or the two-point loading mode can be switched at any time, so that the device can exert different forms of pressure loading on the pipe sheet unit 2 to be tested, more different tests can be performed, and the accuracy of the test structure of the device is further improved.

[0042] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms "first", "second", and similar terms used in the patent application and claims of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar terms do not represent a quantity limitation, but represent the existence of at least one. The terms "including" or "including" and similar terms mean that the elements or objects appearing before "including" or "including" cover the elements or objects listed after "including" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] The above is only an optional embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A loading device for multi-segment assembly bending test of a shield tunnel lining segment, characterized in that, The utility model relates to a door type support (1) and a to be measured pipe piece unit (2), the to be measured pipe piece unit (2) is the circular arc piece structure that a plurality of to be measured pipe pieces (21) fixed splicing, the to be measured pipe piece unit (2) is arranged below the door type support (1), the bottom both sides of door type support (1) are provided with the support plate (3) respectively with the end of to be measured pipe piece unit (2) abuts, two support plate (3) are arranged towards to be measured pipe piece unit (2) inclination, The top beam of the door type support (1) is provided with a pressure loading mechanism (4), and the pressure loading mechanism (4) is configured to move towards the outer arc surface of the to be measured pipe piece unit (2). The side of the support plate (3) away from the to be measured pipe piece unit (2) is provided with a steel support (5), the top of the support plate (3) is hinged with the steel support (5), the side close to the support plate (3) of the steel support (5) is provided with a first push rod (51), the end of the first push rod (51) abuts with the support plate (3), and the first push rod (51) is configured to move towards the support plate (3). The interval of the two support plates (3) in the horizontal direction is adjustable.

2. The loading device for multi-segment bending test of shield tunnel lining segment according to claim 1, characterized in that, The to be measured pipe piece unit (2) is provided with a clamping mechanism (6), the clamping mechanism (6) includes two clamping plates (61) and studs (62), the two clamping plates (61) are respectively arranged on the two sides of the to be measured pipe piece unit (2), the clamping plate (61) is provided with a threaded hole (63), and the stud (62) is screwed with the threaded hole (63).

3. The loading device for the multi-segment assembling bending test of the shield tunnel lining segment according to claim 1, characterized in that, The side close to the to be measured pipe piece unit (2) of the clamping plate (61) is provided with a second push rod (64).

4. The loading device for multi-segment bending test of shield tunnel lining segment according to claim 1, characterized in that, The clamping mechanism (6) is provided with a plurality of clamping mechanisms (6), and the plurality of clamping mechanisms (6) are arranged in the direction of the arc of the to be measured pipe piece unit (2).

5. The loading device for multi-segment bending test of shield tunnel lining segment according to claim 4, characterized in that, The bottom of the pressure loading mechanism (4) is provided with a pad (41), and the pad (41) is in contact with the to be measured pipe piece unit (2).

6. The loading device for multi-segment bending test of shield tunnel lining segment according to claim 4, characterized in that, The pad (41) is provided with two pads (41), and the two pads (41) are arranged at intervals.

7. The loading device for multi-segment bending test of shield tunnel lining segment according to claim 1, characterized in that, ​ 8. The loading device for multi-segment bending test of shield tunnel lining segment according to claim 7, characterized in that, ​

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