Stiff cement soil composite pile model test device

Abstract

The utility model discloses a stiff cement soil composite pile model test device, which comprises a soil body container steel cylinder, a soil body container steel cylinder and a test device, the supporting assembly comprises a vertical support and a transverse support; the loading mechanism is detachably connected with the vertical support and the transverse support, and the output end of the loading mechanism is detachably connected with the pile body; the data transmission system is mounted on the vertical bracket or the transverse bracket; wherein the bottom of the soil body container steel cylinder is provided with a plurality of moving assemblies and horizontal calibration assemblies, a lateral rigidity adjusting module is arranged in the soil body container steel cylinder, the lateral rigidity adjusting module is filled with an experimental soil body, and the pile body is arranged in the experimental soil body. According to the utility model, the on-site manufacturing and reloading test research of the stiff cement soil composite pile is converted into the indoor test, the device is high in integration degree, simple to operate and convenient and fast to assemble / disassemble, and the resource waste is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering experimental devices, in particular to a rigid cement-soil composite pile model test device. Background Art

[0002] Under the construction requirements of a resource-saving and environmentally friendly society, low-carbon and sustainable development in the engineering field is imperative, and the adoption of energy-saving and more economical engineering measures and methods is an inevitable choice for development. In the basic construction of various projects, pile foundations can often provide considerable bearing capacity, but this is accompanied by high costs and huge energy and material consumption. In some engineering constructions that only require a small bearing capacity, such as the construction of photovoltaic power stations on coastal tidal flats, a large amount of resources are often wasted in order to meet the minimum requirements of the specifications. At this time, if you choose to use rigid cement-soil composite piles, it will greatly reduce the cost and energy consumption.

[0003] Reinforced cement-soil composite pile is a new type of composite pile in which the reinforced core pile is vertically implanted into the cement-soil mixing pile after the construction of the cement-soil mixing pile is completed, so that the outer periphery is wrapped by cement soil. It has the larger pile side friction resistance of the cement-soil mixing pile and the higher strength and stiffness of the core pile.

[0004] At present, the research methods for reinforced cement-soil composite piles are mostly on-site production and then testing. However, on-site field tests require a lot of manpower, material resources, and financial resources. In addition, the on-site geological conditions are complex and diverse, and the soil layers are changeable. It is impossible to control a single variable to perform parameter sensitivity analysis and obtain the corresponding parameter values ​​under a specific soil layer, which is not conducive to engineering calculations and numerical simulation analysis. However, due to the inaccuracy of input parameters and the imperfection of numerical simulation model theory, there is a large difference with the real world during numerical simulation analysis, and it cannot truly reflect the actual situation. Therefore, the utility model proposes a reinforced cement-soil composite pile model test device for indoor simulation tests, in order to better reflect the actual situation of reinforced cement-soil composite piles, reduce research costs, save resources, and reduce energy consumption. Utility Model Content

[0005] The utility model aims to provide a rigid cement-soil composite pile model test device to solve the problems existing in the prior art.

[0006] To achieve the above purpose, the utility model provides the following solution: The utility model provides a rigid cement-soil composite pile model test device, comprising:

[0007] A soil container steel cylinder, wherein a pile body is arranged in the soil container steel cylinder;

[0008] A support assembly, the support assembly comprising a vertical support and a horizontal support, the vertical support and the horizontal support are respectively detachably connected to the top end of the soil container steel cylinder;

[0009] A loading mechanism, wherein the loading mechanism is detachably connected to the vertical support and the horizontal support, and an output end of the loading mechanism is detachably connected to the pile body;

[0010] A data transmission system, wherein the data transmission system is installed on the vertical support or the horizontal support, and the data transmission system is fixedly connected to the loading mechanism;

[0011] Among them, a number of moving components and horizontal calibration components are installed at the bottom of the soil container steel cylinder, a lateral stiffness adjustment module is arranged in the soil container steel cylinder, the lateral stiffness adjustment module is filled with experimental soil, and the pile body is arranged in the experimental soil body.

[0012] According to the rigid cement-soil composite pile model test device provided by the utility model, the loading mechanism includes a connecting plate, two parallel hydraulic jacks are fixedly connected to the connecting plate, a pad is arranged between the two hydraulic jacks, the pad is fixedly connected to the connecting plate, a load sensor is fixedly connected to the pad, a steel rod with a ring is detachably connected to the load sensor through a connecting piece, the steel rod with a ring is detachably connected to the pile body, and the hydraulic jack is detachably connected to the vertical support or the horizontal support.

[0013] According to the rigid cement-soil composite pile model test device provided by the utility model, the bottom ends of the two hydraulic jacks are fixedly connected with an extension plate, a clearance hole is opened at the center position of the extension plate, the ring-shaped steel rod passes through the clearance hole, and the extension plate is detachably connected to the vertical bracket or the horizontal bracket.

[0014] According to the rigid cement-soil composite pile model test device provided by the utility model, the vertical support includes two groups of parallelly arranged cross beams, the two groups of cross beams are detachably connected to the top of the soil container steel cylinder, a gap is provided between the two groups of cross beams, and the extension plate is detachably connected to the two cross beams by bolts.

[0015] According to the rigid cement-soil composite pile model test device provided by the utility model, the transverse support includes an L-shaped steel plate, the L-shaped steel plate is detachably connected to the top end of the soil container steel cylinder, the extension plate is detachably connected to one side of the L-shaped steel plate, and a through hole is opened on the L-shaped steel plate, and the through hole is arranged corresponding to the clearance hole.

[0016] According to the rigid cement-soil composite pile model test device provided by the utility model, a plurality of positioning holes are circumferentially and evenly spaced at the top end of the soil container steel cylinder, and the crossbeam and the soil container steel cylinder, and the L-shaped steel plate and the soil container steel cylinder are detachably connected by the bolts.

[0017] According to the rigid cement-soil composite pile model test device provided by the utility model, a drainage hole is provided at the bottom end of the soil container steel cylinder.

[0018] According to the rigid cement-soil composite pile model test device provided by the utility model, the data transmission system comprises a displacement sensor installed on the extension plate, and the pull wire end of the displacement sensor is fixedly connected to the pad.

[0019] According to the rigid cement-soil composite pile model test device provided by the utility model, the moving assembly includes a universal wheel installed at the bottom of the soil container steel cylinder; the horizontal calibration assembly includes a vertical support rod installed at the bottom of the soil container steel cylinder.

[0020] The utility model discloses the following technical effects:

[0021] 1) The utility model transforms the on-site production and reloading test research of rigid cement-soil composite piles into indoor tests. The device has a high degree of integration, simple operation, and convenient and quick assembly / disassembly, which greatly reduces the manpower, material and financial resources required for the research, reduces research costs, saves resources, and reduces energy consumption.

[0022] 2) The utility model avoids the disadvantages of complex geological conditions and variable soil layers on site, and can control the variables of a single soil layer to perform parameter sensitivity analysis and obtain the corresponding parameter values ​​under the specified soil layer, thereby providing accurate parameters for engineering calculations and numerical simulation analysis.

[0023] 3) The utility model avoids the problems of inaccurate input parameters and imperfect model theory during numerical simulation analysis, which are greatly different from the real world, and truly reflects the actual conditions of pile production and loading in the physical world.

[0024] 4) The utility model can solve the problem that the existing test equipment cannot truly reflect the non-uniform constraint effect of the soil around the pile on the pile body, and reduce the experimental error caused by the rigid constraint of the side wall of the steel cylinder of the soil container. At the same time, it overcomes the problem that the traditional method cannot achieve the non-uniform constraint effect on the pile body that gradually increases continuously with the depth even if multiple layers of soil are used. It is particularly suitable for horizontal force situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 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.

[0026] Figure 1It is an axonometric diagram of the rigid cement-soil composite pile model test device (the loading mechanism is connected to the vertical support) of the utility model;

[0027] Figure 2 It is a structural schematic diagram of the mobile component and the horizontal calibration component of the utility model;

[0028] Figure 3 It is a schematic diagram of the non-uniform constraint scheme of the soil around the pile body on the pile body of the utility model;

[0029] Figure 4 It is an axonometric view of the rigid cement-soil composite pile model test device (the loading mechanism is connected with the transverse support) of the utility model.

[0030] Among them, 1. soil container steel cylinder; 2. crossbeam; 3. hydraulic jack; 4. load sensor; 5. displacement sensor; 6. pad; 7. connector; 8. positioning hole; 9. bolt; 10. drainage hole; 11. universal wheel; 12. vertical support rod; 13. pile body; 14. lateral stiffness adjustment module; 15. test soil; 16. steel rod with ring; 17. L-shaped steel plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of 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 are within the scope of protection of the utility model.

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Reference Figure 1-4 The utility model provides a rigid cement-soil composite pile model test device, comprising:

[0034] A soil container steel cylinder 1, wherein a pile body 13 is arranged in the soil container steel cylinder 1;

[0035] A support assembly, the support assembly includes a vertical support and a horizontal support, and the vertical support and the horizontal support are respectively detachably connected to the top of the soil container steel cylinder 1;

[0036] A loading mechanism, the loading mechanism is detachably connected to the vertical support and the horizontal support, and the output end of the loading mechanism is detachably connected to the pile body 13;

[0037] A data transmission system, the data transmission system is installed on a vertical bracket or a horizontal bracket, and the data transmission system is fixedly connected to the loading mechanism;

[0038] Among them, a number of moving components and horizontal calibration components are installed at the bottom of the soil container steel cylinder 1, a lateral stiffness adjustment module 14 is arranged in the soil container steel cylinder 1, the lateral stiffness adjustment module 14 is filled with experimental soil, and the pile body 13 is arranged in the experimental soil. The lateral stiffness adjustment module 14 is selected from materials with a low elastic modulus.

[0039] When the utility model is working, firstly, the soil container steel cylinder 1 is filled with the experimental soil, and a spiral blade hole digger is used to dig a hole in the center of the soil container steel cylinder 1 filled with the test soil 15, and a plastic pipe with the required length and outer diameter smaller than the dug hole diameter is buried in the hole to the specified depth of the test, and a bubble level is used to ensure the horizontality and verticality of the plastic pipe, and a ruler is used to measure whether the specified depth has been reached in the plastic pipe. If not, a Luoyang shovel is used to shovel out the remaining soil at the bottom of the pipe; secondly, the cement-soil mixture prepared according to the test requirements is quantitatively injected into the plastic pipe in batches, and a vibrating rod is used to compact the cement-soil mixture after each injection; after the injection is completed, the plastic pipe is slowly pulled out to allow the cement-soil mixture to collapse naturally until it is in close contact with the surrounding soil, and the cement-soil mixture is added to be level with the top surface of the experimental soil, and the casting of the pile body 13 is completed; then a rigid core pile is implanted in the center of the pile body 13 to the specified position of the test, and a slight The pile body 13 is made dense by plugging and pulling up and down, and the horizontality and verticality of the rigid core pile are ensured by the level bubble meter, and the pile body 13 is simulated for maintenance until the pile body 13 is solidified; finally, if vertical loading needs to be applied, the vertical bracket is fixed to the top of the soil container steel cylinder, and the loading mechanism is installed on the vertical bracket. The loading mechanism outputs the loading force, and the pile body is loaded in the vertical direction. The data transmission system transmits the loading force and displacement data of the loading mechanism to the terminal system. After completion, the deformation and damage of the pile body 13 are checked; if lateral loading needs to be applied, the lateral bracket is fixed to the top of the soil container steel cylinder 1, and the loading mechanism is installed on the lateral bracket. The loading mechanism outputs the lateral loading force, and the pile body 13 is loaded laterally. The data transmission system transmits the loading force and displacement data of the loading mechanism to the terminal system. After completion, the deformation and damage of the pile body 13 are checked.

[0040] The utility model transforms the on-site production and reloading test research of rigid cement-soil composite piles into indoor tests. The device has a high degree of integration, simple operation, and convenient and quick assembly / disassembly, which greatly reduces the manpower, material and financial resources required for the research, reduces the research cost, saves resources and reduces energy consumption.

[0041] The utility model avoids the drawbacks of complex geological conditions and variable soil layers on site, can control a single soil layer variable to perform parameter sensitivity analysis and obtain the corresponding parameter value under the specified soil layer, and provide accurate parameters for engineering calculation and numerical simulation analysis;

[0042] The utility model avoids the problems of inaccurate input parameters and imperfect model theory during numerical simulation analysis, which are greatly different from the real world, and truly reflects the actual conditions of the production and load of the pile body 13 in the physical world;

[0043] The utility model can solve the problem that the existing test equipment cannot truly reflect the non-uniform constraint effect of the soil around the pile on the pile body 13, and reduce the experimental error caused by the rigid constraint of the side wall of the soil container steel cylinder 1. At the same time, it overcomes the problem that the traditional method cannot achieve the non-uniform constraint effect on the pile body 13 that gradually increases continuously with the depth even if multiple layers of soil are used. It is particularly suitable for horizontal force situations.

[0044] A further optimized solution is that the loading mechanism includes a connecting plate, on which two parallel hydraulic jacks 3 are fixedly connected, a pad 6 is arranged between the two hydraulic jacks 3, the pad 6 is fixedly connected to the connecting plate, a load sensor is fixedly connected to the pad 6, a steel rod with a ring 16 is detachably connected to the load sensor through a connecting piece 7, the steel rod with a ring 16 is detachably connected to the pile body 13, and the hydraulic jack 3 is detachably connected to the vertical support or the horizontal support.

[0045] When performing lateral loading, the connecting piece 7 is connected to the ringed steel rod 16, and the end of the ringed steel rod 16 is connected to the external threaded rod reserved for the pile body 13, so as to apply horizontal force to the pile body 13. When performing vertical loading, the connecting piece 7 directly cooperates with the external threaded rod reserved for the pile body 13 to perform vertical force loading.

[0046] A further optimized solution is that the transverse bracket includes an L-shaped steel plate 17, which is detachably connected to the top of the soil container steel cylinder 1, and the extension plate is detachably connected to one side of the L-shaped steel plate 17. A through hole is opened on the L-shaped steel plate 17, and the through hole is correspondingly arranged with the clearance hole.

[0047] The hydraulic jack 3, the pad 6 and the extension plate form a reaction frame, and the pressure is output through the hydraulic jack 3, and the pressure acts on the pad 6. The pad 6 outputs the force through the ring steel rod 16 or directly connected with the external threaded rod reserved for the pile body 13, and finally the force acts on the pile body 13. By applying the force to the pile body 13 and observing the deformation of the pile body 13, the simulation comparison result is given according to the change of the output force and the deformation of the pile body 13, thereby providing a theoretical basis for the actual load of the pile body 13.

[0048] According to a further optimization scheme, the bottom ends of the two hydraulic jacks 3 are fixedly connected with an extension plate, a clearance hole is opened at the center of the extension plate, a steel rod 16 with a ring passes through the clearance hole, and the extension plate is detachably connected to the vertical bracket or the horizontal bracket.

[0049] According to a further optimized solution, the vertical support includes two groups of parallel beams 2, both groups of beams 2 are detachably connected to the top of the soil container steel cylinder 1, a gap is provided between the two groups of beams 2, and the extension plate is detachably connected to the two beams 2 by bolts 9.

[0050] To further optimize the solution, a plurality of positioning holes 8 are provided at equal intervals in the circumferential direction at the top end of the soil container steel cylinder 1, and the cross beam 2 and the soil container steel cylinder 1, and the L-shaped steel plate 17 and the soil container steel cylinder 1 are detachably connected by bolts 9 respectively.

[0051] According to a further optimization scheme, a drainage hole 10 is provided at the bottom end of the soil container steel cylinder 1 .

[0052] In a further optimized solution, the data transmission system includes a displacement sensor 5 mounted on the extension plate, and the displacement sensor 5 is fixedly connected to the hydraulic jack 3. A displacement sensor 5 can be arranged on each side of the jack to obtain more accurate data.

[0053] According to a further optimized solution, the moving assembly includes a universal wheel 11 installed at the bottom of the soil container steel cylinder 1; and the horizontal calibration assembly includes a vertical support rod 12 installed at the bottom of the soil container steel cylinder 1.

[0054] The application method of the rigid cement-soil composite pile model test device comprises the following steps:

[0055] Step 1: Fill the soil container steel cylinder 1 with experimental soil, use a spiral blade hole digger to dig a hole in the center of the soil container steel cylinder 1 filled with the test soil 15, bury a plastic pipe with the required length and an outer diameter smaller than the dug hole diameter in the hole to the specified depth of the test, use a level bubble meter to ensure the horizontality and verticality of the plastic pipe, use a ruler to measure whether the specified depth has been reached in the plastic pipe, and if not, use a Luoyang shovel to remove the remaining soil at the bottom of the pipe; the rigid core pile can be selected from different forms and materials such as steel pipes, steel pipes with spiral blades, plastic pipes / rods, reinforced concrete piles, wooden sticks, bamboo, etc. to meet the needs of different research topics, and the outer core cement soil material can also be replaced by concrete and other materials.

[0056] Step 2: Inject the cement-soil mixture prepared according to the test requirements into the plastic pipe in batches and in a quantitative manner, and use a vibrating rod to compact the cement-soil mixture after each injection; slowly pull out the plastic pipe after the injection is completed, let the cement-soil mixture collapse naturally until it is in close contact with the surrounding soil, add the cement-soil mixture to be level with the top surface of the experimental soil, and complete the pouring of the pile body 13; then implant a rigid core pile in the center of the pile body 13 to the specified position of the test, slightly insert and pull up and down to make the pile body 13 dense, and use a level bubble meter to ensure the horizontality and verticality of the rigid core pile, and simulate the maintenance of the pile body 13 until the pile body 13 is solidified, and then if vertical loading needs to be applied, implement step 3, and if lateral loading needs to be applied, implement step 4;

[0057] Step 3: fix the vertical support to the top of the soil container steel cylinder 1, install the loading mechanism on the vertical support, the loading mechanism outputs the loading force, loads the pile body in the vertical direction, and the data transmission system transmits the loading force and displacement data of the loading mechanism to the terminal system. After completion, check the deformation and damage of the pile body 13;

[0058] Step 4, fix the transverse support on the top of the soil container steel cylinder 1, install the loading mechanism on the transverse support, the loading mechanism outputs the transverse loading force, and loads the pile body 13 laterally. The data transmission system transmits the loading force and displacement data of the loading mechanism to the terminal system. After completion, check the deformation and damage of the pile body 13.

[0059] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A model test device for reinforced cement-soil composite piles, characterized in that: include: A soil container steel cylinder (1), wherein a pile body (13) is arranged inside the soil container steel cylinder (1); A support assembly, the support assembly comprising a vertical support and a horizontal support, the vertical support and the horizontal support are respectively detachably connected to the top end of the soil container steel cylinder (1); A loading mechanism, wherein the loading mechanism is detachably connected to the vertical support and the horizontal support, and an output end of the loading mechanism is detachably connected to the pile body (13); A data transmission system, wherein the data transmission system is installed on the vertical support or the horizontal support, and the data transmission system is fixedly connected to the loading mechanism; A plurality of moving components and horizontal calibration components are installed at the bottom of the soil container steel cylinder (1), a lateral stiffness adjustment module (14) is arranged inside the soil container steel cylinder (1), the lateral stiffness adjustment module (14) is filled with experimental soil, and the pile body (13) is arranged inside the experimental soil.

2. The rigid cement-soil composite pile model test device according to claim 1 is characterized in that: The loading mechanism comprises a connecting plate, on which two hydraulic jacks (3) arranged in parallel are fixedly connected, a pad (6) is arranged between the two hydraulic jacks (3), the pad (6) and the connecting plate are fixedly connected, a load sensor is fixedly connected to the pad (6), and a ring-belt steel rod (16) is detachably connected to the load sensor via a connecting piece (7), the ring-belt steel rod (16) and the pile body (13) are detachably connected, and the hydraulic jack (3) and the vertical support or the horizontal support are detachably connected.

3. The rigid cement-soil composite pile model test device according to claim 2 is characterized in that: An extension plate is fixedly connected to the bottom ends of the two hydraulic jacks (3), a clearance hole is provided at the center of the extension plate, and the extension plate is detachably connected to the vertical bracket or the horizontal bracket.

4. The rigid cement-soil composite pile model test device according to claim 3 is characterized in that: The vertical support comprises two groups of parallelly arranged cross beams (2), the two groups of cross beams (2) are detachably connected to the top of the soil container steel cylinder (1), a gap is provided between the two groups of cross beams (2), and the extension plate is detachably connected to the two cross beams (2) via bolts (9).

5. The rigid cement-soil composite pile model test device according to claim 4 is characterized in that: The transverse support comprises an L-shaped steel plate (17), the L-shaped steel plate (17) is detachably connected to the top end of the soil container steel cylinder (1), the extension plate is detachably connected to one side of the L-shaped steel plate (17), and a through hole is provided on the L-shaped steel plate (17), and the through hole is arranged corresponding to the clearance hole.

6. The rigid cement-soil composite pile model test device according to claim 5 is characterized in that: A plurality of positioning holes (8) are provided at equal intervals in the circumferential direction at the top end of the soil container steel cylinder (1); the cross beam (2) and the soil container steel cylinder (1), and the L-shaped steel plate (17) and the soil container steel cylinder (1) are detachably connected via the bolts (9).

7. The rigid cement-soil composite pile model test device according to claim 1, characterized in that: A drainage hole (10) is provided at the bottom end of the soil container steel cylinder (1).

8. The rigid cement-soil composite pile model test device according to claim 3 is characterized by: The data transmission system comprises a displacement sensor (5) mounted on the extension plate, wherein the displacement sensor (5) is fixedly connected to the extension plate at the bottom of the hydraulic jack (3), and the end of the pull wire is fixedly connected to the pad (6).

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