Physical simulation test device for bearing characteristics of karst cave penetrating type while-drilling pipe-following pile

Abstract

The utility model belongs to the technical field of simulation tests, and particularly relates to a karst cave penetrating type drilling-following tubular pile bearing characteristic physical simulation test device which comprises a model box, a concrete layer is arranged in the model box, a karst cave is formed in the concrete layer, a reserved groove communicated with the karst cave is formed in the concrete layer, and a drilling-following tubular pile is inserted into the reserved groove. The inner wall of the bottom of the model box is fixedly connected with a supporting rod penetrating through the concrete layer, the top of the supporting rod is fixedly connected with a first infrared displacement sensor, and the top of the drilling-following tubular pile is connected with a pressure assembly used for applying pressure to the drilling-following tubular pile. The physical simulation test device for the bearing characteristic of the karst cave crossing type drilling-following tubular pile has the effect of being capable of simulating the settlement condition of the top of the karst cave when the karst cave crossing type drilling-following tubular pile bears pressure.

Description

Technical Field

[0001] The utility model belongs to the technical field of simulation test, in particular to a physical simulation test device for bearing characteristics of a through-cavern type drilling-while-drilling pipe pile. Background Art

[0002] my country's karst area is vast, and the karst landform is characterized by wide distribution, large area, and strong concealment. The existence of caves has a relatively large impact on engineering construction. The bearing characteristics of drilling and pipe piles passing through caves have become one of the key factors affecting the quality of the project.

[0003] In order to better understand the bearing characteristics of drilling and pipe piles, it is necessary to conduct relevant physical simulation tests on the bearing characteristics of drilling and pipe piles. The simulation tests and analysis of relevant data are of great significance to the actual construction on site. Most of the existing simulation tests are for drilling and pipe piles passing through continuous foundations, without caves in the middle, and it is impossible to simulate the bearing characteristics test of drilling and pipe piles passing through caves. However, the relevant physical simulation tests of the bearing characteristics of drilling and pipe piles passing through caves are very important for the application in current construction projects. Therefore, a physical simulation test device for the bearing characteristics of drilling and pipe piles passing through caves is urgently needed. Utility Model Content

[0004] In order to solve the problems in the above-mentioned background technology, the utility model provides a physical simulation test device for the bearing characteristics of the drilling and pipe piles while drilling through the cave. The pressure component is used to apply longitudinal pressure to the drilling and pipe piles along the axis direction of the drilling and pipe piles. The support rod supports the first infrared displacement sensor. The first infrared displacement sensor detects the settlement displacement of the cave top under the action of the longitudinal pressure applied to the drilling and pipe piles, and records the test data. It has the effect of simulating the settlement of the cave top when the drilling and pipe piles while drilling through the cave are under bearing pressure.

[0005] The utility model provides a physical simulation test device for bearing characteristics of a through-karst cave type drill-and-pipe pile, comprising a model box, a concrete layer is arranged in the model box, a karst cave is arranged inside the concrete layer, a reserved groove connected to the karst cave is arranged in the concrete layer, the drill-and-pipe pile is plugged in the reserved groove, a support rod passing through the concrete layer is fixedly connected to the inner wall of the bottom of the model box, a first infrared displacement sensor is fixedly connected to the top of the support rod, and a pressure component for applying pressure to the drill-and-pipe pile is connected to the top of the drill-and-pipe pile.

[0006] By adopting the above technical solution, the pressure component is used to apply longitudinal pressure to the drilling and pipe pile along the axis direction of the drilling and pipe pile, the support rod supports the first infrared displacement sensor, the first infrared displacement sensor detects the settlement displacement of the top of the cave under the action of longitudinal pressure applied to the drilling and pipe pile, and records the test data, which has the effect of simulating the settlement of the top of the cave when the drilling and pipe pile that passes through the cave is under pressure.

[0007] Furthermore, a plurality of strain gauges are fixedly connected to the outer wall of the drilling pipe pile, and a grouting layer is filled between the drilling pipe pile and the inner wall of the reserved groove.

[0008] By adopting the above technical solution, the grouting layer is used to fill the gap between the drilling pile and the inner wall of the reserved groove. When the pressure component applies longitudinal pressure to the drilling pile, the strain gauge is used to detect the horizontal strain data of the drilling pile itself.

[0009] Furthermore, a first pressure sensor is fixedly connected to the lower end of the drilling pipe pile.

[0010] By adopting the above technical solution, the first pressure sensor is used to detect the pressure of the bottom of the drilling pile on the concrete layer, simulating the pressure on the bottom of the drilling pile when the drilling pile passes through the cave type.

[0011] Furthermore, the pressure assembly includes a support frame, a jack is connected to the lower surface of the support frame, and a piston rod of the jack abuts against the top of the drilling follow-up pipe pile.

[0012] By adopting the above technical solution, the support frame supports the jack, and the piston rod of the jack applies longitudinal pressure to the drilling pile.

[0013] Furthermore, a second pressure sensor is fixedly connected between the jack and the supporting frame.

[0014] By adopting the above technical solution, when the piston rod of the jack applies longitudinal pressure to the while-drilling tubular pile, the second pressure sensor detects the longitudinal pressure exerted on the while-drilling tubular pile.

[0015] Furthermore, a second infrared displacement sensor is fixedly connected to the top of the concrete layer.

[0016] By adopting the above technical solution, when the piston rod of the jack applies longitudinal pressure to the drilling pile, the second infrared displacement sensor is used to detect the settlement displacement of the top of the concrete layer.

[0017] Furthermore, a fixing frame is provided on the outside of the model box, and a sound-generating displacement monitor facing the cave is fixedly connected to the fixing frame.

[0018] By adopting the above technical solution, when the piston rod of the jack applies longitudinal pressure to the drilling pile, the acoustic displacement monitor is used to detect the displacement of the concrete layer around the cave.

[0019] Furthermore, a grouting pipe is provided inside the drilling and pipe pile, the bottom of the grouting pipe passes through the drilling and pipe pile, and a sealing layer is sleeved on the outside of the grouting pipe, and the sealing layer is plugged into a reserved groove at the top of the cave.

[0020] By adopting the above technical scheme, when the piston of the jack does not abut against the top of the drilling and pipe pile, the grouting pipe fills slurry into the gap between the reserved groove below the cave and the drilling and pipe pile, forming a grouting layer in the reserved groove below the cave, and then the plugging layer is sleeved with the drilling and pipe pile, the plugging layer blocks the connection between the reserved groove above the cave and the cave, and the slurry is filled into the gap between the reserved groove and the drilling and pipe pile on the top of the concrete layer, forming a grouting layer in the reserved groove above the cave, and the plugging layer reduces the possibility of slurry flowing into the cave when grouting into the reserved groove above the cave.

[0021] Furthermore, the model box is divided into a first box body and a second box body, and a fixing component is provided between the first box body and the second box body.

[0022] By adopting the above technical solution, after the bearing characteristics test of the pile while drilling through the cave is completed, the fixing component releases the restriction on the first box and the second box, and separates the first box and the second box from the concrete layer respectively, which has the effect of facilitating the observation of the overall changes of the concrete layer after the test.

[0023] Furthermore, the fixing assembly includes a first fixing plate fixedly connected to a pair of side walls of the first box body, a pair of side walls of the second box body are fixedly connected to a pair of second fixing plates arranged corresponding to the first fixing plate, and bolts pass through the first fixing plate and the second fixing plate on the same side.

[0024] By adopting the above technical solution, the bolts connect and fix the first fixing plate and the second fixing plate, and then connect and fix the first box body and the second box body. The first box body and the second box body can be separated by removing the bolts from the first fixing plate and the second fixing plate.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] (1) The pressure assembly is used to apply longitudinal pressure to the drilling pile along the axis of the drilling pile. The support rod supports the first infrared displacement sensor. The first infrared displacement sensor detects the settlement displacement of the top of the cave under the longitudinal pressure applied to the drilling pile and records the test data. It has the effect of simulating the settlement of the top of the cave when the drilling pile passes through the cave under pressure.

[0027] (2) When the piston rod of the jack applies longitudinal pressure to the while-drilling tubular pile, the second pressure sensor detects the longitudinal pressure exerted on the while-drilling tubular pile.

[0028] (3) When the piston rod of the jack applies longitudinal pressure to the drilling pile, the second infrared displacement sensor is used to detect the settlement displacement of the top of the concrete layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of the structure of Example 1 of the present application;

[0031] Figure 2 For attachment Figure 1 A magnified schematic diagram of part A;

[0032] Figure 3 For attachment Figure 1 A magnified schematic diagram of part B;

[0033] Figure 4 For attachment Figure 1 A magnified schematic diagram of part C;

[0034] Figure 5 This is a schematic diagram of the structure of Example 2 of the present application.

[0035] Explanation of the reference numerals: 1. model box; 11. first box body; 12. second box body; 2. concrete layer; 21. cave; 22. reserved groove; 23. grouting layer; 24. second infrared displacement sensor; 3. follow-up pipe pile while drilling; 31. first pressure sensor; 32. strain gauge; 33. grouting pipe; 34. sealing layer; 4. support rod; 41. first infrared displacement sensor; 5. pressure assembly; 51. support frame; 511. second pressure sensor; 52. jack; 6. fixing frame; 61. acoustic displacement monitor; 7. fixing assembly; 71. first fixing plate; 72. second fixing plate; 73. bolts. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model.

[0037] The following is combined with Figure 1 To Attachment Figure 5 And specific embodiments describe the present invention in detail.

[0038] The utility model provides a physical simulation test device for bearing characteristics of a karst cave-crossing type while-drilling pipe pile.

[0039] Example 1

[0040] like Figures 1 to 4 As shown, a physical simulation test device for the bearing characteristics of a drilling-while-drilling pile passing through a cave includes a model box 1, a concrete layer 2 is cast inside the model box 1, an elliptical cavity is inside the concrete layer 2, the elliptical cavity is a cave 21, the elliptical cavity in the concrete layer 2 is used to simulate the environment of the cave 21, and the concrete layer 2 is used to simulate the geological environment around the cave 21.

[0041] A reserved groove 22 is provided in the concrete layer 2, and the top and bottom of the karst cave 21 are both connected to the reserved groove 22, and the top of the reserved groove 22 is set through the concrete layer 2. A drilling follow-up pipe pile 3 is inserted in the reserved groove 22, and the drilling follow-up pipe pile 3 passes through the karst cave 21. The lower end of the drilling follow-up pipe pile 3 is fixedly connected to a first pressure sensor 31, and the first pressure sensor 31 abuts against the bottom of the reserved groove 22.

[0042] The gap between the drilling follow-up pipe pile 3 and the inner wall of the reserved groove 22 is filled with a grouting layer 23. A pair of support rods 4 are fixedly connected to the inner wall of the bottom of the model box 1. The upper surface of each support rod 4 is fixedly connected to a first infrared displacement sensor 41. The support rods 4 are placed in the concrete layer 2. The top of the first infrared displacement sensor 41 is placed in the cave 21. The first infrared displacement sensor 41 is used to detect the settlement displacement of the top of the cave 21.

[0043] A pressure assembly 5 is provided outside the model box 1, and the pressure assembly 5 is used to apply longitudinal pressure along the axis direction of the while drilling pipe pile 3 to the while drilling pipe pile 3. The pressure assembly 5 includes a support frame 51, and a jack 52 is connected to the lower surface of the support frame 51. The piston rod of the jack 52 abuts against the top of the while drilling pipe pile 3, and the jack 52 is used to provide longitudinal pressure along the axis direction of the while drilling pipe pile 3 to the while drilling pipe pile 3.

[0044] The piston rod of the jack 52 applies longitudinal pressure to the drilling follow-up pipe pile 3, and the first infrared displacement sensor 41 detects the settlement displacement of the top of the cave 21 under the action of the longitudinal pressure applied to the drilling follow-up pipe pile 3, and records the test data, which has the effect of simulating the settlement of the top of the cave 21 when the drilling follow-up pipe pile 3 passing through the cave 21 bears pressure.

[0045] The first pressure sensor 31 is used to detect the pressure of the bottom of the drilling pile 3 on the concrete layer 2 and record the experimental data to simulate the pressure on the bottom of the drilling pile 3 when the type 21 drilling pile 3 passes through the cave.

[0046] A plurality of strain gauges 32 are fixedly connected to the outer wall of the drilling pile 3 . When the piston rod of the jack 52 applies longitudinal pressure to the drilling pile 3 , the strain gauges 32 are used to detect the horizontal strain data of the drilling pile 3 itself.

[0047] A second pressure sensor 511 is provided between the jack 52 and the support frame 51. The second pressure sensor 511 is fixedly connected to the lower surface of the support frame 51, and the top of the jack 52 is fixedly connected to the lower surface of the second pressure sensor 511. When the piston rod of the jack 52 applies longitudinal pressure to the while-drilling tubular pile 3, the second pressure sensor 511 detects the longitudinal pressure exerted on the while-drilling tubular pile 3.

[0048] A second infrared displacement sensor 24 is placed on the top of the concrete layer 2, and is used to detect the distance between the top of the concrete layer 2 and the lower surface of the support frame 51. When the piston rod of the jack 52 applies longitudinal pressure to the drilling pile 3, the second infrared displacement sensor 24 is used to detect the settlement displacement of the top of the concrete layer 2.

[0049] A fixing frame 6 is provided on the outside of the model box 1, and an acoustic displacement monitor 61 is fixedly connected to a side of the fixing frame 6 close to the model box 1. The acoustic displacement monitor 61 is arranged facing the cave 21. When the piston rod of the jack 52 applies longitudinal pressure to the drilling pile 3, the acoustic displacement monitor 61 is used to detect the displacement of the concrete layer 2 around the cave 21, and is used to simulate the displacement of the geology around the cave 21.

[0050] A pair of grouting pipes 33 are provided inside the drilling pile 3. The bottom of the grouting pipes 33 penetrates the side wall of the drilling pile 3, and the lower end of the grouting pipes 33 is connected to the reserved groove 22 at the bottom of the cave 21. When the piston of the jack 52 does not abut against the top of the drilling pile 3, slurry is filled into the gap between the reserved groove 22 below the cave 21 and the drilling pile 3 through the grouting pipes 33, forming a grouting layer 23 in the reserved groove 22 below the cave 21.

[0051] The plugging layer 34 is sleeved on the outside of the drilling pipe pile 3. After the grouting work of the grouting pipe 33 is completed, the plugging layer 34 is sleeved on the drilling pipe pile 3, and the plugging layer 34 is placed above the karst cave 21. The plugging layer 34 blocks the connection between the reserved groove 22 above the karst cave 21 and the karst cave 21. Grout is filled into the gap between the reserved groove 22 and the drilling pipe pile 3 at the top of the concrete layer 2 to form a grouting layer 23 in the reserved groove 22 above the karst cave 21. The plugging layer 34 reduces the possibility of the slurry flowing into the inside of the karst cave 21 when grouting is performed in the reserved groove 22 above the karst cave 21.

[0052] The implementation principle of Example 1 is as follows: the piston rod of the jack 52 applies longitudinal pressure to the drilling pile 3, the first infrared displacement sensor 41 detects the settlement displacement of the top of the cave 21 under the longitudinal pressure applied to the drilling pile 3, and the first pressure sensor 31 is used to detect the pressure of the bottom of the drilling pile 3 on the concrete layer 2. When the piston rod of the jack 52 applies longitudinal pressure to the drilling pile 3, the second pressure sensor 511 detects the longitudinal pressure on the drilling pile 3, the second infrared displacement sensor 24 is used to detect the settlement displacement of the top of the concrete layer 2, and the acoustic displacement monitor 61 is used to detect the displacement of the concrete layer 2 around the cave 21, and is used to simulate the displacement of the geology around the cave 21.

[0053] Example 2

[0054] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that the model box 1 is composed of two parts spliced ​​together, the model box 1 is divided into a first box body 11 and a second box body 12, and a fixing component 7 is provided between the first box body 11 and the second box body 12, and the fixing component 7 connects and fixes the first box body 11 and the second box body 12.

[0055] When drilling and following the pile 3 (refer to Figure 4 ) After the load-bearing characteristic test is completed, the fixing assembly 7 releases the restriction on the first box body 11 and the second box body 12, and the first box body 11 and the second box body 12 are respectively connected to the concrete layer 2 (refer to Figure 4 ) separation makes it convenient to observe the overall changes of the concrete layer 2 after the test from the outside of the concrete layer 2.

[0056] The fixing assembly 7 comprises a first fixing plate 71 fixedly connected to a pair of side walls of the first box body 11, and a second fixing plate 72 fixedly connected to a pair of side walls of the second box body 12. When the first box body 11 and the second box body 12 are in contact, the first fixing plate 71 and the second fixing plate 72 are arranged in a one-to-one correspondence. A bolt 73 passes through the first fixing plate 71 and the second fixing plate 72 located on the same side, and the bolt 73 connects and fixes the first fixing plate 71 and the second fixing plate 72, thereby connecting and fixing the first box body 11 and the second box body 12.

[0057] When the first box body 11 and the second box body 12 need to be separated, the bolts 73 are removed from the first fixing plate 71 and the second fixing plate 72 , and the bolts 73 release the restrictions on the first fixing plate 71 and the second fixing plate 72 , so that the first box body 11 and the second box body 12 are separated.

[0058] The utility model is further described above with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the utility model. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the utility model.

Claims

1. A physical simulation test device for bearing characteristics of drilling-while-drilling piles through karst caves, characterized in that: The invention comprises a model box (1), wherein a concrete layer (2) is provided inside the model box (1), a karst cave (21) is provided inside the concrete layer (2), the concrete layer (2) is provided with a reserved groove (22) communicating with the karst cave (21), a drilling-while-pipe pile (3) is inserted into the reserved groove (22), a support rod (4) passing through the concrete layer (2) is fixedly connected to the inner wall of the bottom of the model box (1), a first infrared displacement sensor (41) is fixedly connected to the top of the support rod (4), and a pressure assembly (5) for applying pressure to the drilling-while-pipe pile (3) is connected to the top of the drilling-while-pipe pile (3).

2. According to claim 1, a physical simulation test device for bearing characteristics of a pile while drilling through a karst cave, characterized in that: A plurality of strain gauges (32) are fixedly connected to the outer wall of the drilling-following pipe pile (3), and a grouting layer (23) is filled between the drilling-following pipe pile (3) and the inner wall of the reserved groove (22).

3. A physical simulation test device for bearing characteristics of a pile while drilling through a cave according to claim 1 or 2, characterized in that: The lower end of the drilling-while-drilling pipe pile (3) is fixedly connected to a first pressure sensor (31).

4. A physical simulation test device for bearing characteristics of a pile while drilling through a cave according to claim 3, characterized in that: The pressure assembly (5) comprises a support frame (51), the lower surface of the support frame (51) is connected to a jack (52), and the piston rod of the jack (52) abuts against the top of the drilling pile (3).

5. A physical simulation test device for bearing characteristics of a pile while drilling through a cave according to claim 4, characterized in that: A second pressure sensor (511) is fixedly connected between the jack (52) and the support frame (51).

6. The physical simulation test device for bearing characteristics of a pile while drilling through a cave according to claim 3 is characterized in that: A second infrared displacement sensor (24) is fixedly connected to the top of the concrete layer (2).

7. The physical simulation test device for bearing characteristics of a pile while drilling through a cave according to claim 3 is characterized in that: A fixing frame (6) is provided on the outside of the model box (1), and a sound-generating displacement monitor (61) facing the karst cave (21) is fixedly connected to the fixing frame (6).

8. The physical simulation test device for bearing characteristics of a pile while drilling through a cave according to claim 3 is characterized in that: A grouting pipe (33) is provided inside the drilling-following pipe pile (3), the bottom of the grouting pipe (33) passes through the drilling-following pipe pile (3), a plugging layer (34) is sleeved on the outside of the grouting pipe (33), and the plugging layer (34) is plugged into a reserved groove (22) at the top of the karst cave (21).

9. The physical simulation test device for bearing characteristics of a pile while drilling through a cave according to claim 1 is characterized in that: The model box (1) is divided into a first box body (11) and a second box body (12), and a fixing component (7) is provided between the first box body (11) and the second box body (12).

10. A physical simulation test device for bearing characteristics of a pile while drilling through a cave according to claim 9, characterized in that: The fixing assembly (7) comprises a first fixing plate (71) fixedly connected to a pair of side walls of the first box body (11); a pair of side walls of the second box body (12) are fixedly connected to a pair of second fixing plates (72) arranged corresponding to the first fixing plate (71); and a bolt (73) passes through the first fixing plate (71) and the second fixing plate (72) located on the same side.

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