Device and experimental method for testing disturbance influence of left-right close adhesion pipe construction

Abstract

The application discloses a device and experimental method for testing disturbance influence of left-right close top pipe construction, and belongs to the technical field of geotechnical engineering; the device comprises a simulation sample, and an impact assembly arranged on one side of the simulation sample to apply disturbance; a first spring cover plate and a second spring cover plate are arranged on the other side and the upper side of the simulation sample respectively; a plurality of displacement meters are arranged between the first spring cover plate, the second spring cover plate and the simulation sample. The application utilizes the working environment of the simulation main body structure, simulates generated disturbance, observes the influence on the main body structure, and further evaluates the disturbance influence on the completed main body structure in the subsequent top pipe construction process.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, and in particular to a device and experimental method for testing the impact of disturbance during the construction of closely spaced pipe jacking. Background Technology

[0002] Pipe jacking is a common trenchless construction method. However, underground space resources are more limited in bustling urban areas, and the use of the close-fitting pipe jacking method is becoming more and more frequent. Because the left and right pipes are close to each other, the subsequent pipe jacking process will cause some disturbance. We cannot evaluate how these disturbances affect the main structure that has been completed earlier.

[0003] Therefore, based on our engineering experience, our company has developed a device and experimental method for testing the disturbance impact of left-right close-fitting pipe jacking construction, which is used to evaluate the disturbance impact on the completed main structure during subsequent pipe jacking construction. Summary of the Invention

[0004] The purpose of this invention is to address the problem in the prior art that there is no suitable device or method for evaluating the impact of construction disturbance on existing projects, and to propose a device and experimental method for testing the impact of construction disturbance in left-right close-fitting pipe jacking.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An apparatus for testing the impact of disturbance during the construction of closely spaced pipe jacking includes a simulated specimen and an impact assembly disposed on one side of the simulated specimen to apply disturbance.

[0007] The simulated sample is provided with a first spring cover plate and a second spring cover plate on the other side and the top side, respectively.

[0008] Several displacement gauges are installed between the first spring cover plate, the second spring cover plate and the simulated sample.

[0009] Preferably, the simulated specimen and impact assembly are mounted on a support platform;

[0010] An L-shaped mounting base is provided on the support platform; a mounting plate is provided on the inner side of the L-shaped mounting base, and the simulated sample is placed on the mounting plate;

[0011] The vertical surface of the L-shaped mounting base is located on the side where the impact assembly is located, and a through-hole larger than the side of the simulated sample is opened on the vertical surface.

[0012] Preferably, a shock-absorbing pad is provided between the side of the simulated sample and the vertical surface of the L-shaped mounting base.

[0013] Preferably, strain gauges are mounted on the simulated specimen.

[0014] Preferably, a first straight rod and a second straight rod are respectively provided on the upper and lower sides of the first spring cover plate; a third straight rod and a fourth straight rod are respectively provided on the left and right sides of the second spring cover plate; and a fifth straight rod and a sixth straight rod are respectively provided on the lower left side and the upper right side of the L-shaped mounting base.

[0015] The first straight rod is connected to the third straight rod, the second straight rod is connected to the fifth straight rod, and the fourth straight rod is connected to the sixth straight rod by fasteners.

[0016] Preferably, the first, second, third, fourth, fifth, and sixth straight rods are each evenly arranged in a plurality of units, and are provided with scale markings.

[0017] Preferably, the impact component is mounted on a support platform and slides via a slide rail.

[0018] Preferably, the impact assembly includes a main rod;

[0019] A sliding ring is provided on the main rod, and a guide rod is horizontally provided on the sliding ring. A spring and an impactor are sleeved on the guide rod.

[0020] The guide rod is equipped with a scale.

[0021] The experimental method for testing the impact of disturbance during the construction of left and right closely spaced pipe jacking is carried out using the aforementioned device for testing the impact of disturbance during the construction of left and right closely spaced pipe jacking.

[0022] Includes the following steps:

[0023] S1. Fabrication of simulated specimens: Based on the dimensions of the tube segment and dimensions that are easy to measure, determine the reduction ratio and fabricate simulated specimens; reduce the size proportionally to the actual force on the tube segment, and determine the pressure to be applied to the simulated specimen in the vertical and horizontal directions.

[0024] S2. Install the experimental setup: Select different damping pads according to the distance of the simulated sample based on the disturbance distance; install the first spring cover plate and the second spring cover plate as required by the pressure to be applied.

[0025] S3. Applying disturbance: Applying disturbance to the simulated sample through the impact assembly;

[0026] S4. Measurement and Analysis: By collecting real-time numerical changes from strain gauges and displacement meters, the impact of disturbances on the main structure is analyzed.

[0027] Preferably, in step S3:

[0028] The impactor is inserted into the guide rod to compress the spring, and the energy provided by the entire impact assembly is determined by the scale on the guide rod; the guide rod provides the loading path.

[0029] By adjusting the position of the impact component on the slide rail, the impact position can be changed in the front-to-back direction; by adjusting the position of the sliding ring on the main rod, the impact position can be changed in the up-to-down direction.

[0030] Compared with the prior art, the present invention provides a device and experimental method for testing the impact of disturbance during the construction of closely spaced left and right jacking pipes, which has the following beneficial effects.

[0031] 1. This invention utilizes the simulated working environment of the main structure and the simulated disturbances to observe the impact on the main structure, and then evaluates the disturbance impact on the completed main structure during subsequent pipe jacking construction in the actual environment.

[0032] 2. In this invention, a scaled-down simulated specimen is first made to simulate the environment during the actual operation of the tunnel lining segments; the impact component is used to simulate the disturbance generated during the subsequent construction of the project, and the changes in the readings of the displacement gauge and strain gauge are observed to obtain the changes of the simulated specimen under different disturbance conditions, thereby evaluating the disturbance impact on the completed main structure during the subsequent pipe jacking construction process.

[0033] Other advantages, objectives and features of the invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be learned from practice of the invention. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention.

[0035] Figure 2 This is a partial structural schematic diagram of the present invention.

[0036] Figure 3 This is a front view schematic diagram of the second spring cover plate.

[0037] Figure 4 This is a schematic diagram of the impact assembly.

[0038] Figure 5 This is a schematic diagram of the right-side structure of the first spring cover plate.

[0039] Figure 6 This is a schematic diagram of the bottom structure of the second spring cover plate.

[0040] In the picture:

[0041] 1. Simulated specimen; 2. Impact assembly; 201. Main rod; 202. Sliding ring; 203. Guide rod; 204. Spring; 205. Impact body; 3. First spring cover plate; 301. First straight rod; 302. Second straight rod; 4. Second spring cover plate; 401. Third straight rod; 402. Fourth straight rod; 5. Displacement gauge; 6. Support platform; 7. L-shaped mounting base; 701. Fifth straight rod; 702. Sixth straight rod; 8. Mounting plate; 9. Vibration damping pad; 10. Strain gauge; 11. Fastener; 12. Slide rail. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] Reference Figure 1-6 An apparatus for testing the impact of disturbance during the construction of a left-right close-fitting jacking pipe includes a simulated specimen 1 and an impact assembly 2 disposed on one side of the simulated specimen 1 to apply disturbance.

[0044] To facilitate testing, the actual size of the pipe segment was scaled down proportionally, with the scaling down ratio determined according to the principle of experimental convenience, and a simulated sample 1 of the corresponding size was made. The impact component 2 is an independent device used to simulate the disturbances generated during the subsequent pipe jacking construction.

[0045] The other side and the top side of the simulated specimen 1 are respectively provided with a first spring cover plate 3 and a second spring cover plate 4, which are used to simulate the vertical earth pressure and the lateral earth pressure on the simulated specimen 1.

[0046] Similarly, the magnitude of the force applied by the first spring cover plate 3 and the second spring cover plate 4 is also reduced accordingly based on the reduction ratio of the simulated sample 1.

[0047] It should be noted that both the first spring cover plate 3 and the second spring cover plate 4 are composed of a cover plate and several springs disposed on the cover plate; the two spring cover plates are parallel to the two sides of the frame device respectively.

[0048] The springs are fixed to the cover plate by welding or other means. The length, elastic coefficient, number, and placement of the springs are determined according to the pressure to be provided.

[0049] Meanwhile, several displacement gauges 5 are set between the first spring cover plate 3, the second spring cover plate 4 and the simulated sample 1 for measurement.

[0050] It is understandable that the displacement gauge 5 paired with the first spring cover plate 3 is used to measure the disturbance displacement of the simulated sample 1 in the horizontal direction; the displacement gauge 5 paired with the second spring cover plate 4 is used to measure the disturbance displacement of the simulated sample 1 in the vertical direction.

[0051] It should be noted that the displacement gauge 5 is installed in the space between the springs, and the placement of the displacement gauge 5 is selected according to the designed monitoring and measurement points.

[0052] Furthermore, strain gauges 10 are mounted on the simulated specimen 1.

[0053] like Figure 1 , 2 As shown, several strain gauges 10 are installed on the front end face of the simulated specimen 1 to observe the deformation of the simulated specimen 1 after impact; the strain gauges 10 are paired with the displacement gauges 5 to jointly measure the influence of the disturbance on the simulated specimen 1 and obtain more reliable and comprehensive data.

[0054] Understandably, it is also equipped with a corresponding computer and measurement system; the real-time data from displacement gauge 5 and strain gauge 10 are transmitted to the computer and analyzed by the measurement system.

[0055] When this device is in use, the impact component 2 applies a disturbance to one side of the simulated sample 1; by collecting the real-time numerical changes of the displacement gauge 5 and strain gauge 10, the deformation of the simulated sample 1 under different disturbance conditions is determined, and then the disturbance impact on the completed main structure during the subsequent pipe jacking construction process is determined.

[0056] In some embodiments, the simulated specimen 1 and the impact assembly 2 are placed on the support platform 6, providing a stable and reliable placement environment for both.

[0057] The support platform 6 is equipped with an L-shaped mounting base 7; the inner side of the L-shaped mounting base 7 is equipped with a mounting plate 8, and the simulated sample 1 is placed on the mounting plate 8.

[0058] Correspondingly, the vertical surface of the L-shaped mounting base 7 is located on the side where the impact assembly 2 is located; at the same time, a through-hole larger than the side of the simulated sample 1 is opened on the vertical surface so that the impact assembly 2 can pass through the through-hole and impact the simulated sample 1.

[0059] It should be noted that the L-shaped mounting base 7 is fixed on the support platform 6; the mounting plate 8 is a flat plate structure, which can be placed or fixed on the L-shaped mounting base 7, and can maintain a certain stability by simulating the gravity of the sample 1.

[0060] In some embodiments, a shock-absorbing pad 9 is provided between the side of the simulated sample 1 and the vertical surface of the L-shaped mounting base 7.

[0061] Understandably, it is necessary to test the effects of disturbances of different intensities and distances in the experiment. By setting damping pads 9 on one side of the simulated sample 1, damping pads 9 of different materials and thicknesses are placed according to the distance between the actual location of the disturbance and the tube segment, so as to simulate the attenuation of disturbances under actual working conditions.

[0062] Among them, the shock-absorbing pad 9 can be made of materials such as rubber, foam, and plastic; in specific use, it is selected according to the disturbance to be simulated; thus, the attenuation coefficient of different materials is used to simulate the distance of the vibration from the simulated sample 1.

[0063] In some embodiments, a first straight rod 301 and a second straight rod 302 are respectively provided on the upper and lower sides of the first spring cover plate 3; a third straight rod 401 and a fourth straight rod 402 are respectively provided on the left and right sides of the second spring cover plate 4; and a fifth straight rod 701 and a sixth straight rod 702 are respectively provided on the lower left side and the upper right side of the L-shaped mounting base 7.

[0064] Meanwhile, the first straight rod 301 and the third straight rod 401, the second straight rod 302 and the fifth straight rod 701, and the fourth straight rod 402 and the sixth straight rod 702 are respectively connected by fasteners 11.

[0065] It should be noted that the distance between the two spring cover plates and the simulated sample 1 can be adjusted by the cooperation between the straight rod and the fastener 11; at the same time, the pressure applied to the simulated sample 1 can be adjusted and matched by the selection of springs.

[0066] In addition, several straight rods 301, 302, 401, 402, 701, and 702 are evenly distributed and marked with graduations. That is, a straight rod extends from the two spring cover plates and the L-shaped mounting base 7 at regular intervals for mutual fixation.

[0067] The distance between adjacent straight rods is determined according to the force to be applied, so as to ensure that the overall structural strength and stiffness of the spring cover plate meet the requirements.

[0068] Correspondingly, the straight rod has markings to facilitate precise control of the distance, thereby adjusting the applied pressure.

[0069] In some embodiments, the impact component 2 is mounted on the support platform 6 via a slide rail 12 to slide, thereby enabling the impact component 2 to be adjusted forward and backward and controlling the impact position.

[0070] In some embodiments, the impact assembly 2 includes a main rod 201; a sliding ring 202 is provided on the main rod 201, a guide rod 203 is horizontally provided on the sliding ring 202, and a spring 204 and an impact body 205 are sleeved on the guide rod 203.

[0071] It is understood that the impact assembly 2 is a device that provides velocity and kinetic energy to the impact body 205; in the installed state, the end of the guide rod 203 is close to the side of the simulated sample 1, but does not contact it; the impact body 205 is provided with a through hole that matches the guide rod 203; the spring 204 is disposed between the impact body 205 and the sliding ring 202.

[0072] In use, the impact assembly 2 is installed on one side of the simulated sample 1, and a certain amount of kinetic energy is obtained by compressing the spring 204 through the impact body 205; at the same time, it can slide back and forth and up and down through the slide rail 12 and the sliding ring 202 to impact different positions.

[0073] In some embodiments, the guide rod 203 is provided with a scale; the scale facilitates precise control of the compressive energy provided by the entire impact assembly 2.

[0074] An experimental method for testing the impact of disturbance during the construction of left-right closely spaced pipe jacking is employed, using an apparatus designed for this purpose. The method includes the following steps: preparing a simulated sample, installing the experimental apparatus, applying disturbance, and measuring and analyzing the results.

[0075] S1. Making a simulated sample: Based on the size of the tube segment and the size that is easy to measure (principle of experimental convenience), determine the reduction ratio and make a simulated sample 1; reduce the size proportionally to the actual force on the tube segment, and determine the pressure to be applied to the simulated sample 1 in the vertical and horizontal directions.

[0076] S2. Install the experimental setup: Select different damping pads 9 according to the distance of the disturbance distance to simulate the sample 1, and install the first spring cover plate 3 and the second spring cover plate 4 according to the required pressure.

[0077] Specifically, an L-shaped mounting base 7 is installed on the support platform 6, a mounting plate 8 is placed inside the L-shaped mounting base 7, a simulated sample 1 is placed on the mounting plate 8, and a shock-absorbing pad 9 is placed on it; then, the first spring cover plate 3 and the second spring cover plate 4 are installed, and the impact assembly 2 is installed.

[0078] S3. Apply disturbance: Apply disturbance to simulated sample 1 through impact component 2.

[0079] Specifically, the impactor 205 is inserted into the guide rod 203 to compress the spring 204, and the energy provided by the entire impact assembly 2 is determined by the scale on the guide rod 203; the guide rod 203 provides the loading path, and the impactor 205 is loaded along the guide rod 203.

[0080] By adjusting the position of the impact component 2 on the slide rail 12, the impact position can be changed in the front-to-back direction; by adjusting the position of the sliding ring 202 on the main rod 201, the impact position can be changed in the up-to-down direction.

[0081] S4. Measurement and Analysis: By collecting real-time numerical changes of strain gauge 10 and displacement gauge 5, the impact of disturbance on the main structure is analyzed.

[0082] This invention first creates a scaled-down simulation specimen 1 to simulate the environment during actual tunnel segment operation; then, it uses an impact assembly 2 to simulate the disturbances generated during subsequent pipe jacking construction, observes the changes in the readings of displacement gauge 5 and strain gauge 10, obtains the changes of the simulation specimen 1 under different disturbance conditions, and then evaluates the impact of disturbances on tunnel segments under actual working conditions.

[0083] This invention can analyze the disturbance impact on the completed main structure during subsequent pipe jacking construction. Two spring cover plates are used to compress springs to simulate soil pressure in the horizontal and vertical directions; the impact assembly 2 provides impact energy by compressing springs through the impact body 205; and the deformation and disturbance of the simulated sample 1 under disturbance conditions are measured by the installed displacement gauge 5 and strain gauge 10.

[0084] In this invention, the device has a simple structure. It utilizes the simulated working environment of the main structure and the simulated disturbances to observe the impact on the main structure, and then evaluates the disturbance impact on the completed main structure during subsequent pipe jacking construction in the actual environment.

[0085] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for testing the disturbance effect of left-right close-fit pipe jacking construction, characterized in that, Including analog sample (1), and the impact assembly (2) that sets up on one side of analog sample (1) applies disturbance; The other side, upside of analog sample (1) is provided with first spring cover plate (3) and second spring cover plate (4) respectively; First spring cover plate (3), second spring cover plate (4) are provided with a plurality of displacement meters (5) between first spring cover plate (3), second spring cover plate (4) and analog sample (1).

2. The device for testing the disturbance influence of the left and right close-fit pipe construction according to claim 1, characterized in that, Analog sample (1), impact assembly (2) are set up on support platform (6); L-shaped mounting seat (7) is set up on support platform (6);The inner side of L-shaped mounting seat (7) is provided with setting plate (8), and analog sample (1) is placed on setting plate (8); The vertical face of L-shaped mounting seat (7) is located on the side where impact assembly (2) is located, and a through hole larger than the side of analog sample (1) is formed in the vertical face.

3. The device for testing the disturbance influence of the left and right close-fit pipe construction according to claim 2, characterized in that, Damping pad (9) is arranged between the side of analog sample (1) and the vertical face of L-shaped mounting seat (7).

4. The device for testing the disturbance influence of the left and right close-fit pipe construction according to claim 1, characterized in that, Strain gauge (10) is installed on analog sample (1).

5. The device for testing the disturbance influence of the left and right close-fit pipe construction according to claim 2, characterized in that, First straight rod (301), second straight rod (302) are arranged on the upper and lower sides of first spring cover plate (3) respectively;Third straight rod (401), fourth straight rod (402) are arranged on the left and right sides of second spring cover plate (4) respectively;Fifth straight rod (701), sixth straight rod (702) are arranged below the left side and above the right side of L-shaped mounting seat (7) respectively; First straight rod (301) and third straight rod (401), second straight rod (302) and fifth straight rod (701), fourth straight rod (402) and sixth straight rod (702) are connected by fastener (11) respectively.

6. The device for testing the disturbance influence of the left and right close-fit pipe construction according to claim 5, characterized in that, First straight rod (301), second straight rod (302), third straight rod (401), fourth straight rod (402), fifth straight rod (701) and sixth straight rod (702) are evenly provided with a plurality of scales respectively.

7. The device for testing the disturbance influence of the left and right close-fit pipe construction according to claim 2, characterized in that, Impact assembly (2) is installed on support platform (6) to slide through slide rail (12).

8. The device for testing the disturbance influence of the left and right close-fit pipe construction according to claim 7, characterized in that, Impact assembly (2) includes main rod (201); Slide ring body (202) is arranged on main rod (201), guide rod (203) is arranged horizontally on slide ring body (202), spring (204) and impact body (205) are sleeved on guide rod (203). Scale is arranged on guide rod (203).

9. A test method for testing the disturbance influence of close-fit pipe jacking construction, characterized in that, The device for testing the influence of disturbance on pipe jacking construction is used, and The device comprises the following steps: S1, making analog sample: according to the size of rectangular pipe piece and the size convenient for measurement, the scale is determined, and analog sample (1) is made;The pressure applied to analog sample (1) in vertical and horizontal directions is determined in proportion to the actual force on rectangular pipe piece; S2, installing experimental device: different damping pads (9) are selected according to the distance of disturbance from analog sample (1);First spring cover plate (3) and second spring cover plate (4) are installed according to the required pressure; S3, applying disturbance: impact assembly (2) is used to apply disturbance to analog sample (1); S4, measurement analysis: by collecting real-time numerical changes of strain gauges (10) and displacement meters (5), the influence of disturbance on the main structure is analyzed.

10. The experimental method for testing the disturbance influence of the left-right close-fit pipe construction according to claim 9, characterized in that, In step S3: The impact body (205) inserts the guide rod (203) to compress the spring (204), and the size of the energy provided by the entire impact assembly (2) is determined through the scale on the guide rod (203); the guide rod (203) provides a loading path; By adjusting the position of the impact assembly (2) on the slide rail (12), the impact position in the front-back direction is changed; by adjusting the position of the sliding ring body (202) on the main rod (201), the impact position in the up-down direction is changed.

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