CN219348212U - Test device for simulating construction influence of left and right closely attached jacking pipes - Google Patents
Test device for simulating construction influence of left and right closely attached jacking pipes Download PDFInfo
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- CN219348212U CN219348212U CN202320738348.5U CN202320738348U CN219348212U CN 219348212 U CN219348212 U CN 219348212U CN 202320738348 U CN202320738348 U CN 202320738348U CN 219348212 U CN219348212 U CN 219348212U
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Abstract
The utility model discloses a test device for simulating the construction influence of left and right closely attached jacking pipes, and belongs to the technical field of geotechnical engineering; comprises a U-shaped frame, a sample and a simulation body which is arranged in the sample and can be taken out; the test sample is fixed on the inner side of the U-shaped frame through a side pressure adjusting assembly and a bottom supporting assembly; the top of U type frame is installed the apron, the lower extreme of apron is provided with the spring, install a plurality of displacement meter between apron and the sample. The device has simple structure and convenient operation; the influence effect of the speed and sequence of the excavation process on the engineering can be known in advance in a laboratory by a reduced model, and guidance is provided for engineering construction.
Description
Technical Field
The utility model relates to the technical field of geotechnical engineering, in particular to a test device for simulating the influence of left and right closely-attached jacking pipe construction.
Background
In order to meet the requirement of city development, various cities are built with a lot of underground projects. The pipe jacking method is a common construction mode, and because of the limitation of urban space, the construction mode of the left and right close-fitting pipe jacking is also used more and more frequently, but the construction of the left and right close-fitting pipe jacking method can influence each other during construction due to the fact that the distance between a left line and a right line is relatively short, and the problems of influence of the sequence and the speed of construction on the whole engineering are unknown. Therefore, it is necessary to build a test apparatus to simulate various conditions that may occur during excavation under actual working conditions. Currently, there is no suitable test setup for simulation.
Disclosure of Invention
The utility model aims to solve the problem that in the prior art, an experimental device is required to be designed to simulate the influence of the construction of a left and right closely-attached jacking pipe, and provides the experimental device for simulating the influence of the construction of the left and right closely-attached jacking pipe.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a test device for simulating the construction influence of left and right closely attached jacking pipes comprises a U-shaped frame, a sample and a simulation body which is arranged in the sample and can be taken out;
the test sample is fixed on the inner side of the U-shaped frame through a side pressure adjusting assembly and a bottom supporting assembly;
the top of U type frame is installed the apron, the lower extreme of apron is provided with the spring, install a plurality of displacement meter between apron and the sample.
In some embodiments, a plurality of displacement meters are installed between the lower end of the sample and the U-shaped frame.
In some embodiments, the sample comprises a first sample and a second sample, and the simulant comprises a first simulant and a second simulant disposed within the first sample and the second sample, respectively.
In some embodiments, the side pressure regulating assembly is a number of jacks;
one end of the jack is fixed on the inner side of the U-shaped frame, and the other end of the jack abuts against the side face of the sample.
In some embodiments, the bottom support assembly is comprised of a number of evenly distributed springs.
In some embodiments, the cover plate is mounted above the U-shaped frame by a connection assembly.
In some embodiments, the connecting assembly comprises a plurality of horizontal rods arranged at two sides of the cover plate and a plurality of vertical rods arranged at the top ends of two sides of the U-shaped frame;
the vertical rod is connected with the horizontal rod through a fastener.
In some embodiments, the vertical rod is provided with graduations.
Compared with the prior art, the utility model provides the test device for simulating the construction influence of the left and right closely attached jacking pipes, which has the following beneficial effects.
1. The device has simple structure and convenient operation; the influence effect of the speed and sequence of the excavation process on the engineering can be known in advance in a laboratory by a reduced model, and guidance is provided for engineering construction.
2. According to the utility model, through loading the working environment of the segment simulated by the sample, the speed and sequence of the simulated body drawn out from the sample are observed, the real-time change of the reading of the displacement meter arranged in the vertical direction is observed, and the deformation condition of the ground can be finally obtained; and further provides data support for measures to be taken in the next step.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows; and will be apparent to those skilled in the art in part based upon a review of the following; alternatively, the teachings may be directed to practice of the present utility model.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1.
Fig. 3 is a schematic view of the lower structure of the cover plate.
In the figure:
1. a U-shaped frame; 2. a sample; 201. a first sample; 202. a second sample; 3. a simulator; 301. a first simulator; 302. a second simulator; 4. a side pressure regulating assembly; 5. a bottom support assembly; 6. a cover plate; 7. a spring; 8. a displacement meter; 9. a connection assembly; 901. a horizontal bar; 902. a vertical rod; 903. a fastener.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
Referring to fig. 1 to 3, a test apparatus for simulating the influence of left and right closely attached pipe jacking construction comprises a U-shaped frame 1, a sample 2, and a simulator 3 which is provided in the sample and can be taken out.
Wherein, the sample 2 is the segment which is reduced according to a certain proportion, the simulator 3 is inserted into the inside of the sample 2 to simulate the excavated soil sample. A simulator 3 is placed in the sample 2 to represent an unexcavated state; the speed and sequence of extraction of the dummy 3 from the test specimen 2 represent the excavation speed and excavation sequence.
Specifically, the sample 2 includes a first sample 201 and a second sample 202, and the dummy 3 includes a first dummy 301 and a second dummy 302 provided in the first sample 201 and the second sample 202, respectively; to achieve simulation of the left and right lines.
It is understood that the first sample 201 and the second sample 202 may be configured as a single structure or may be assembled from two parts; the sample 2 is of a simulated segment structure; the inside of the sample 2 is provided with holes, the simulation body 3 is matched with the holes, and the two holes are correspondingly positioned at the middle positions of the two sides.
As shown in fig. 1, the sample 2 is fixed on the inner side of the U-shaped frame 1 through a side pressure adjusting assembly 4 and a bottom supporting assembly 5; the sample 2 is supported and fixed, and the external environment is simulated.
Meanwhile, a cover plate 6 is installed at the top end of the U-shaped frame 1.
Correspondingly, a spring 7 is arranged at the lower end of the cover plate 6, and the lower end of the spring 7 is contacted with the top end of the sample; a plurality of displacement meters 8 are arranged between the cover plate 6 and the sample 2.
Specifically, the springs 7 are uniformly distributed and fixed at the lower end of the cover plate 6; the spring rate and length of the spring 7 are determined by the force required to load the sample 2.
The displacement meter 8 is arranged at the position between the springs 7 and is used for monitoring the vertical displacement of the sample 2 at different positions; the positions of the displacement meters 8 are arranged according to the design monitoring points; the displacement meter 8 has corresponding numbers, and measured values thereof are transmitted to a computer in real time through the acquisition system, so that the influence of the excavation speed and the sequence is finally evaluated.
The sample 2 is reduced in the same proportion as the left and right line segment shapes, and the force applied to the sample 2 is also reduced in the same proportion; the lateral pressure adjusting component 4 applies transverse pressure to the sample, and the cover plate 6 and the spring 7 apply vertical pressure to the sample so as to simulate the stress condition before excavation.
When in use, after the bottom supporting component 5 and the side pressure regulating component 4 are sequentially arranged on the U-shaped frame 1, the sample 2 is placed and fixed (the simulation body 3 is placed in the sample 2 in advance); then installing a cover plate 6 to finish the initial state of the simulation device; by observing the speed and sequence of extraction of the simulant 3 from the sample 2, the change in readings of the displacement meters 8 at different positions is observed to characterize deformations, sedimentation, and even doming that may occur at different positions of the engineering excavation.
In some embodiments, a plurality of displacement meters 8 are arranged between the lower end of the sample 2 and the U-shaped frame 1; the real-time change of the data below the line is observed, so that the test data is further enriched.
In some embodiments, the side pressure regulating assembly 4 is a plurality of jacks mounted on both sides of the interior of the U-shaped frame 1.
Wherein, the axis of the jack extends horizontally and is in the same plane with the axis of the sample 2; the oil pump system is used for loading the sample 2, so that the stress of the sample 2 in the actual lateral direction in operation is simulated, and the effect of simulating the lateral soil pressure of the pipe piece is achieved.
It will be appreciated that the jack is detachably mounted on the inside of the U-shaped frame 1; one end of the jack is fixedly arranged on the inner side of the U-shaped frame 1, and the other end of the jack abuts against the side face of the sample 2.
It can be understood that a plurality of jacks are arranged uniformly according to the length of the sample 2; in order to form stable and reliable support, a panel structure is arranged at the inner end of the jack and is attached to and abutted against the side face of the sample 2.
In some embodiments, the bottom support assembly 5 is made up of a number of evenly distributed springs 7 to simulate the force of the bottom.
In some embodiments, the cover plate 6 is mounted above the U-shaped frame 1 by a connection assembly 9.
Specifically, the connecting assembly 9 includes a plurality of horizontal rods 901 disposed on both sides of the cover plate 6, and a plurality of vertical rods 902 disposed on both top ends of the U-shaped frame 1; the vertical bar 902 is connected to the horizontal bar 901 by fasteners 903.
As shown in fig. 2; horizontal rods 901 are arranged at intervals on two opposite sides of the cover plate 6 in an outward extending mode and are used for being installed with the U-shaped frame 1; the top ends of the two sides of the U-shaped frame 1 are provided with vertical rods 902 which extend upwards corresponding to the distance of the horizontal rods 901.
By controlling the mounting position of the fasteners 903 on the vertical rod 902, the position of depression of the cover plate 6 and thus the force provided to the sample 2 is controlled.
The size of the adjacent spaces between the horizontal bars 901 is determined according to the soil pressure required to be provided, so as to ensure the rigidity of the whole structure of the cover plate 6.
Further, in some embodiments, the vertical rod 902 is provided with graduations, which facilitates accurate control of the distance between the cover plate 6 and the sample 2.
When the device is used, the bottom support component 5 simulates the pressure of the bottom surface of the segment, and the side pressure regulating component 4 simulates the pressure of the side surface of the segment; by controlling the position of the cover plate 6, the force provided by the spring 7 to the sample is adjusted, completing the initial state of the simulation device.
In the test, the first simulation body 301 and the second simulation body 302 are extracted from the sample 2 at different speeds and in different sequences to simulate the speed and sequence of excavation; observing the reading change of the displacement meter 8 at different positions under different conditions so as to simulate the excavation condition; the reading of the displacement meter 8 can be transmitted to a computer in real time and used for analyzing the change condition of the whole sample 2 extracted by the simulator 3, and finally the deformation condition of the ground can be obtained; and further provides data support for measures to be taken in the next step.
Specifically, the first simulator 301 is pulled out from the first sample 201 to simulate the excavation of the left line in the left and right lines; the right line excavation is simulated by the second simulator 302 being withdrawn from the second test specimen 202. The extraction speeds are different according to the extraction sequences of the first simulation body 301 or the second simulation body 302, and the simulation left and right line excavation sequences and the speeds are different.
Under different modes, the reading changes of the displacement meters 8 at different positions are measured, so that the displacement of different positions of the sample 2 in the vertical direction in the extraction process of the first simulation body 301 and the second simulation body 302 is measured, the deformation condition of the ground before and after excavation is judged, and the influence of the excavation is further obtained.
Aiming at the problem that the conventional method cannot know various deformation possibly generated by left and right closely-attached jacking pipe excavation in advance in a laboratory and the influence of excavation speed and sequence on engineering, the utility model discloses a test device for simulating the construction influence of the left and right closely-attached jacking pipes; by loading the sample 2 in the segment working environment, the speed and sequence of the extraction of the simulation body 3 from the sample 2 are observed, and the real-time change of the readings of the displacement meter 8 arranged in the vertical direction is observed, so that the influence possibly caused by different excavation positions is obtained.
In the utility model, the device has simple structure and convenient operation; the influence effect of the speed and sequence of the excavation process on the engineering can be known in advance in a laboratory by a reduced model, and guidance is provided for engineering construction.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (8)
1. The test device for simulating the construction influence of the left and right closely attached jacking pipes is characterized by comprising a U-shaped frame (1), a sample (2) and a simulation body (3) which is arranged in the sample and can be taken out;
the test sample (2) is fixed on the inner side of the U-shaped frame (1) through a side pressure adjusting assembly (4) and a bottom supporting assembly (5);
the top of U-shaped frame (1) is installed apron (6), the lower extreme of apron (6) is provided with spring (7), install a plurality of displacement meter (8) between apron (6) and sample (2).
2. The test device for simulating the construction influence of the left and right closely attached jacking pipes according to claim 1, wherein a plurality of displacement meters (8) are arranged between the lower end of the test sample (2) and the U-shaped frame (1).
3. The test device for simulating the influence of left and right closely-attached pipe jacking construction according to claim 1, wherein the test sample (2) comprises a first test sample (201) and a second test sample (202), and the simulation body (3) comprises a first simulation body (301) and a second simulation body (302) which are respectively arranged in the first test sample (201) and the second test sample (202).
4. The test device for simulating the construction influence of the left and right closely attached jacking pipes according to claim 1, wherein the side pressure adjusting assembly (4) is a plurality of jacks;
one end of the jack is fixed on the inner side of the U-shaped frame (1), and the other end of the jack is propped against the side face of the sample (2).
5. The test device for simulating the construction influence of the left and right closely attached jacking pipes according to claim 1, wherein the bottom supporting assembly (5) is composed of a plurality of springs (7) which are uniformly distributed.
6. The test device for simulating the construction influence of the left and right closely attached jacking pipes according to claim 1, wherein the cover plate (6) is arranged above the U-shaped frame (1) through a connecting assembly (9).
7. The test device for simulating the construction influence of the left and right closely attached jacking pipes according to claim 6, wherein the connecting assembly (9) comprises a plurality of horizontal rods (901) arranged on two sides of the cover plate (6) and a plurality of vertical rods (902) arranged on the top ends of two sides of the U-shaped frame (1);
the vertical rod (902) is connected with the horizontal rod (901) through a fastener (903).
8. The test device for simulating the construction influence of the left and right closely attached jacking pipes according to claim 7, wherein scales are arranged on the vertical rod (902).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320738348.5U CN219348212U (en) | 2023-04-06 | 2023-04-06 | Test device for simulating construction influence of left and right closely attached jacking pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320738348.5U CN219348212U (en) | 2023-04-06 | 2023-04-06 | Test device for simulating construction influence of left and right closely attached jacking pipes |
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| Publication Number | Publication Date |
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| CN219348212U true CN219348212U (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320738348.5U Active CN219348212U (en) | 2023-04-06 | 2023-04-06 | Test device for simulating construction influence of left and right closely attached jacking pipes |
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| CN (1) | CN219348212U (en) |
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- 2023-04-06 CN CN202320738348.5U patent/CN219348212U/en active Active
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