Segmented pipe gallery simulation device at ground fracture

Abstract

The utility model provides a device for simulating a segmented pipe gallery at a ground fracture, which comprises a model box, a simulation foundation is filled in the model box, and an underground structure formed by splicing a plurality of segmented pipe galleries is embedded in the simulation foundation; the heads and the tails of every two segmented pipe galleries are connected through a water stop belt. A row of pressure sensors are arranged on the top face of the underground structure at preset intervals, and a row of strain gauges are arranged on the side face of the underground structure at preset intervals. A row of displacement sensors are arranged below the underground structure according to preset intervals, and all the displacement sensors make contact with the bottom face of the underground structure; all the displacement sensors, the strain gauges and the pressure sensors are electrically connected with the acquisition instrument, and the acquisition instrument is electrically connected with the PC. According to the utility model, the segment length of the pipe gallery passing through the ground fissure can be accurately obtained, so that the safety and the stability of the pipe gallery in the ground fissure area are ensured, and powerful support is provided for underground space development and utilization of cities.

Description

TECHNICAL FIELD

[0001] The utility model relates to civil engineering technical field, concretely relates to a sectioned pipe gallery simulation device at ground fissure. BACKGROUND

[0002] As an important infrastructure of the city, the underground comprehensive pipe gallery undertakes the important functions such as water supply, gas, municipal pipe network transportation and laying. However, in some complex geological conditions areas, such as the city of ground fissure development, the construction of underground comprehensive pipe gallery will be greatly influenced, for example: ground fissure activity can cause pipe gallery to produce displacement and deformation, and this deformation is often complex, including stretching, compression, bending and other forms;For example: under the ground fissure dislocation, pipe gallery structure can produce tensile-extrusion, tensile-torsional shear, shear and other damage forms, and can appear bottom void phenomenon. Void can cause the stress state of pipe gallery structure to change, further influence its safety and stability. Therefore, in order to adapt to the displacement of ground fissure, pipe gallery needs to be divided into several sections, and special connecting mode is used between each section, such as telescopic joint or flexible connection, and the longer the section length of pipe gallery, the more the risk of structural stability, construction difficulty and cost and monitoring and maintenance difficulty can be increased;And too short section can increase the number of joints, reduce construction efficiency, affect the overall structural performance and increase operation and maintenance cost.

[0003] Therefore, it is particularly important to adopt reasonable section length of pipe gallery in actual engineering. However, at present, the section length of pipe gallery is mostly obtained according to experience, so the section precision is not high enough. UTILITY MODEL CONTENTS

[0004] The utility model provides a sectioned pipe gallery simulation device at ground fissure to solve the defect that the section length of pipe gallery is not high in prior art.

[0005] A sectioned pipe gallery simulation device at ground fissure, comprising: a model box, the model box is filled with simulated foundation, and the underground structure formed by splicing a plurality of sectioned pipe galleries is embedded in the simulated foundation;The head and tail of every two sectioned pipe galleries are connected by a water stop belt;

[0006] A row of pressure sensors is arranged on the top surface of the underground structure according to a preset interval, and a row of strain gauges is arranged on the side surface according to a preset interval;

[0007] A row of displacement sensors is arranged below the underground structure according to a preset interval, and all displacement sensors are in contact with the bottom surface of the underground structure;

[0008] All displacement sensors, strain gauges and pressure sensors are electrically connected with a collection instrument, and the collection instrument is electrically connected with a PC.

[0009] Further, the displacement sensor is suspendedly fixed on the fixed rod which is arranged in parallel below the underground structure.

[0010] Further, the displacement sensor is suspendedly fixed on the fixed rod which is arranged in parallel below the underground structure.

[0011] Further, the displacement sensor is suspendedly fixed on the fixed rod which is arranged in parallel below the underground structure.

[0012] Further, the displacement sensor is suspendedly fixed on the fixed rod which is arranged in parallel below the underground structure.

[0013] Further, the displacement sensor is suspendedly fixed on the fixed rod which is arranged in parallel below the underground structure.

[0014] Further, the displacement sensor is suspendedly fixed on the fixed rod which is arranged in parallel below the underground structure.

[0015] Further, the displacement sensor is suspendedly fixed on the fixed rod which is arranged in parallel below the underground structure.

[0016] Further, the displacement sensor is suspendedly fixed on the fixed rod which is arranged in parallel below the underground structure.

[0017] The underground structure formed by the plurality of sectional pipe galleries is buried in the simulated foundation, and then various tests are carried out, and various test data collected by the strain gauges, the pressure sensors and the displacement sensors can be used to accurately obtain the sectional length of the pipe gallery passing through the ground fissure, so that the safety and stability of the pipe gallery in the ground fissure area are ensured, and powerful support is provided for the development and utilization of the underground space of the city. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The sectional pipe gallery simulation device passing through a ground fissure provided by the utility model is shown in the structure diagram;

[0019] Figure 2 The positional relationship between the displacement sensor and the magnetic base is shown in the diagram;

[0020] Reference signs:

[0021] 1 - Model box; 2 - Cover plate; 3 - Strain gauge; 4 - Pressure sensor; 5 - Water stop belt; 6 - Simulated foundation; 7 - Displacement sensor; 8 - Acquisition instrument; 9 - Sectional pipe gallery; 10 - Fixed rod; 11 - PC; 12 - Magnetic table base. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] Figure 1 The sectional pipe gallery simulation device provided by the utility model has the structure diagram as shown in the figure, which comprises a model box 1 filled with a simulated foundation 6, and an underground structure formed by splicing a plurality of sectional pipe galleries 9 is embedded in the simulated foundation 6. Figure 1 Each two sectional pipe galleries 9 are connected through a water stop belt 5 between the head and tail thereof. A row of pressure sensors 4 is arranged on the top surface of the underground structure according to a preset interval, and a row of strain gauges 3 is arranged on the side surface according to a preset interval. A row of displacement sensors 7 is arranged below the underground structure according to a preset interval, and all the displacement sensors 7 are in contact with the bottom surface of the underground structure. All the displacement sensors 7, strain gauges 3 and pressure sensors 4 are electrically connected with an acquisition instrument 8, and the acquisition instrument 8 is electrically connected with a PC 11.

[0024] Specifically, the simulation process of the device is as follows.

[0025] Step 1: According to the test requirements, the strain gauges 3 are pasted along the side edges of the sectional pipe galleries, which are used for monitoring the strain change of the simulated foundation 6, wherein the simulated foundation 6 is a soil body.

[0026] Step 2: All the pasted strain gauges 3 are connected with the acquisition instrument 8 through the data transmission lines and connected to the PC for data analysis, wherein the acquisition instrument 8 is a distributed dynamic strain acquisition instrument.

[0027] Step 3: The pressure sensors 4 are arranged on the top and bottom outer surfaces of the sectional pipe galleries 9 according to the requirements, which are used for testing the change of the contact pressure between the soil and the underground structure under different soil settlement amounts.

[0028] Step 4: The epoxy resin is used as the bonding agent, and the water stop belt 5 is used to splice the plurality of sectional pipe galleries 9 into a whole to form the underground structure.

[0029] Step 5: The model soil is tamped in the model box 1 according to 1 / 3 of the virtual soil thickness, and the soil is filled to 15cm.

[0030] Step 6: The soil is filled to 15cm, and a fixed rod 10 made of square steel pipe is placed at the central axis position along the length direction of the underground structure, and a plurality of displacement sensors 7 are suspendedly fixed on the fixed rod 10.

[0031] Step 7: Continue to fill the soil, so that the bottom of all displacement sensors 7 is empty and buried in the soil, and then the underground structure is placed;

[0032] Step 8: Continue to fill the soil to the theoretical height of 40cm, and stand for 12 hours, connect the test element to the acquisition instrument 8, test the initial displacement of the simulated foundation 6, the contact pressure between the simulated foundation 6 and the underground structure, the strain of the underground structure, the deformation characteristics of the construction joint of the underground structure, and the bottom void of the underground structure.

[0033] Step 9: The test is completed, the underground structure is excavated, and the deformation of the simulated foundation 6 and the water stop belt 5 is recorded, and the reasonable segmentation length of the pipe gallery is determined according to the deformation.

[0034] The segmented pipe gallery simulation device provided by the utility model can accurately obtain the segmentation length of the pipe gallery through the ground fissure by burying the underground structure composed of a plurality of segmented pipe galleries in the simulated foundation, then testing various parameters, and collecting various test data by using strain gauges, pressure sensors and displacement sensors, thereby ensuring the safety and stability of the pipe gallery in the ground fissure area and providing strong support for the development and utilization of underground space of the city.

[0035] Further, the displacement sensors 7 are suspendedly fixed on the fixed rod 10, and the fixed rod 10 is arranged in parallel below the underground structure.

[0036] Specifically, since the displacement sensor is used for monitoring the relative displacement between underground structures, the position of the displacement sensor should be fixed to ensure the accuracy of the detected data, and the displacement sensor 7 is fixed on the fixed rod 10 at a fixed interval by using a relatively static fixing device (the fixed rod 10).

[0037] The device provided by the application can effectively improve the accuracy of the experiment by suspendingly fixing the displacement sensor 7 on the fixed rod 10, so that the determination of the segmentation length of the pipe gallery is more accurate.

[0038] Further, Figure 2 As shown in the position relationship diagram of the displacement sensor and the magnetic base, each displacement sensor 7 is correspondingly fixed on a magnetic base 12, and all the magnetic bases 12 are fixed on the fixed rod 10. Figure 2 ​

[0039] Specifically, the device provided by the application can make each displacement sensor contact the bottom of the underground structure, improve the measurement accuracy, fix the displacement sensor 7 on the magnetic base 12, adjust the position of the displacement sensor 7 by the magnetic base 12, and thus ensure that each displacement sensor 7 can contact the bottom of the underground structure.

[0040] Further, the application is laid on the inner wall of the model box 1 with double-layer plastic film.

[0041] Specifically, during the test, considering the uneven settlement of the filling and the friction effect between the model box, the application lays double-layer plastic film on the inner surface of the model box, and adds talcum powder to reduce the influence of the boundary conditions of the model test, so as to further improve the determination accuracy of the segment length of the pipe gallery.

[0042] Further, the device provided by the application further comprises a cover plate 2 for pressing the simulated foundation 6 in the model box 1. One side of the model box 1 is made of steel plate, and the remaining three sides are made of acrylic transparent glass.

[0043] Specifically, the application considers the convenience of filling work, sets the front of the test model box 1 as a detachable steel plate 11, and adopts an upper open structure, and sets the side as acrylic transparent glass 12, so as to more intuitively observe the settlement of the soil body.

[0044] Further, the distribution density of the strain gauge 3 in the area close to each water stop 5 is greater than that in the area away from the water stop 5. The distribution density of the displacement sensor 7 in the area close to each water stop 5 is greater than that in the area away from the water stop 5. The distribution density of the pressure sensor 4 in the area close to each water stop 5 is greater than that in the area away from the water stop 5.

[0045] Specifically, in order to improve the test accuracy, the strain gauge 3, the displacement sensor 7 and the pressure sensor 4 need to be laid in the interface of the underground structure.

[0046] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A segmented pipe rack crossing a ground fissure simulation apparatus, characterized in that, The utility model relates to a model box (1) is filled with simulation foundation (6) in the model box (1), and the underground structure is embedded in the simulation foundation (6) by splicing with a plurality of sectional pipe gallery (9), and the head and tail between every two sectional pipe gallery (9) are connected through water stop (5). A row of pressure sensors (4) is arranged on the top surface of the underground structure according to a preset interval, and a row of strain gauges (3) is arranged on the side surface according to a preset interval. A row of displacement sensors (7) is arranged below the underground structure according to a preset interval, and all displacement sensors (7) are in contact with the outer bottom surface of the underground structure. All displacement sensors (7), strain gauges (3) and pressure sensors (4) are embedded in the simulation foundation (6) and electrically connected with a collection instrument (8), and the collection instrument (8) is electrically connected with a PC (11). The displacement sensor (7) is suspended and fixed on a fixed rod (10), the fixed rod (10) is arranged in parallel below the underground structure, and the fixed rod (10) is embedded in the simulation foundation (6).

2. The buried utility break simulation apparatus of claim 1, wherein, Each displacement sensor (7) is correspondingly fixed on a magnetic table base (12), and all magnetic table bases (12) are fixed on the fixed rod (10).

3. The buried utility break simulation apparatus of claim 2, wherein, A double-layer plastic film is laid on the inner wall of the model box (1).

4. The buried fracture sectioning pipe rack simulation apparatus according to any one of claims 1 to 3, characterized by, The utility model also includes a cover plate (2) for pressing the simulation foundation (6) in the model box (1).

5. The buried fracture at segmental pipe rack simulation apparatus of claim 4, wherein, One side of the model box (1) is made of detachable steel plate, and the remaining three sides are made of acrylic transparent glass.

6. The buried fracture at segmental pipe rack simulation apparatus of claim 4, wherein, In the area close to each water stop (5), the distribution density of the strain gauge (3) is greater than that far from the water stop (5).

7. The buried fracture at segmental pipe rack simulation apparatus of claim 4, wherein, In the area close to each water stop (5), the distribution density of the displacement sensor (7) is greater than that far from the water stop (5).

8. The buried fracture at segmental pipe rack simulation apparatus of claim 4, wherein, In the area close to each water stop (5), the distribution density of the pressure sensor (4) is greater than that far from the water stop (5).

9. The buried fracture at segmental pipe rack simulation apparatus of claim 4, wherein, ​

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