An adjustable prototype test device for tubular curtain structure components

Abstract

The present invention discloses an adjustable prototype test device for pipe curtain structure members, which includes a reaction frame, a sliding support, a loading test box and a vertical loading mechanism; the sliding support includes a base slide rail, a support and a base jack. There are two parallel base slide rails, and both ends of the base slide rails are respectively slidably connected to the opposite two lower horizontal cross beams. Two supports are slidably arranged on the base slide rails, and the model member is fixedly installed on the two supports; the loading test box includes a box body with upper and lower openings formed by enclosing four side wall plates, and the outside of each side wall plate is connected to the positioning holes on the reverse frame through a number of horizontally arranged jacks. The present invention can accurately measure the deformation and failure form of pipe curtain with lock test members of different sizes under the action of simulated real soil loads, and provide a theoretical basis for the optimal design of the members.

Description

Technical Field

[0001] The present invention relates to the technical field of model loading of pipe curtain structural members, and particularly relates to an experimental device that can artificially adjust the size of a model box and simultaneously measure the loading force and deformation of a pipe curtain structure. Background Art

[0002] The pipe curtain construction method is widely used in the construction of shallow-buried and mined tunnels. The mechanical properties and failure modes of the pipe curtain structure have a great influence on the overall bearing capacity of the structure. Therefore, it is necessary to study the loading characteristics of local pipe curtain structural members. However, it is very difficult to achieve the loading force of local pipe curtain structural members with current technical means.

[0003] The utility model of the publication number CN211816479U provides a mechanical property test device for retaining pipe piles and underground pipe curtains, including a fixing device, a loading device, strain gauges, and a collecting device; the fixing device includes two bearing platforms and two clamps. The clamps include an upper clamping part and a lower clamping part. The upper clamping part and the lower clamping part are used to clamp from the upper and lower sides of the test piece extending in the left-right direction. The upper clamping part and the lower clamping part are detachably connected to detachably fix the left and right ends of the test piece in the two clamps respectively. The two clamps are respectively fixed on the two bearing platforms so that the middle part of the test piece is suspended; the pressing part of the loading device faces the middle part of the test piece and applies a downward pressure to the middle part of the test piece. The strain gauges are attached to the surfaces of the pipe piles and the locking joints of the test piece, and the collecting device is connected to the strain gauges for measuring the strain of the pipe piles and the locking joints. The technical solution proposed by this utility model can study the overall lateral stiffness of the test piece, the ultimate bending strength of the locking joint and the test piece.

[0004] In this technical solution, the pressing block has to directly abut against the test piece for mechanical property tests, and it is impossible to simulate the actual loading force scenario.

[0005] The invention of the publication number CN107505449A discloses a model test device for a pipe curtain support structure. The device includes an interface surrounded by plexiglass plates and a simulated pipe curtain composed of plexiglass tubes. The inside of the device is filled with model soil, and also includes dial gauges for measuring the settlement of the ground surface and the simulated pipe curtain, as well as pressure boxes and resistance strain gauges installed on the surface of the plexiglass tubes for measuring the pressure and deformation borne by the simulated pipe curtain respectively. The device of the present invention can simulate the stress redistribution phenomenon generated in a certain range of soil due to soil excavation, and can accurately simulate relatively complex boundary conditions; the interface surrounded by plexiglass plates of the device can intuitively reflect the deformation of the soil during construction; by setting a simulated pipe curtain composed of plexiglass tubes with adjustable spacing and variable forms, different working conditions can be simulated. Therefore, the device can be used for experiments under different working conditions, greatly reducing the repetitive workload and simplifying the experimental device and process.

[0006] This technical solution aims to simulate and reflect the deformation of soil during construction and cannot be used to study the loading characteristics of local pipe roof structure components.

[0007] The utility model with the publication number CN211061207U discloses a simulation device for the rectangular large-section pipe roof tunneling method, which includes an interface, a pipe roof model, and vertical temporary supports. The interface is a cuboid-shaped box structure with an open top, and its side walls and bottom wall are assembled by transparent glass plates. The interface is filled with model soil. The pipe roof model is horizontally buried in the upper part of the model soil. The part of the model soil below the pipe roof model is divided into multiple sections of virtual soil to be excavated. The vertical temporary supports are used to support between the lower end of the pipe roof model in this area and the bottom wall of the interface after each section of the soil to be excavated is dug out. The upper surface of the pipe roof model is provided with a detection component for measuring the force and deformation of the pipe roof model, and a detector for detecting its settlement information is provided above the model soil. Advantages: It can conduct model test research on the rectangular large-section and large-span pipe roof model tunneling method under different working conditions, and solves the problem that the existing model devices are difficult to accurately simulate the construction process.

[0008] This technical solution lies in refining the simulation of the construction process of excavation while supporting under the action of pipe roof pre-support and vertical temporary supports, and cannot be used to study the loading characteristics of local pipe roof structure components. Summary of the Invention

[0009] The purpose of the present invention is to provide an adjustable prototype test device for pipe roof structure components.

[0010] To solve the above technical problems, the present invention adopts the following technical solutions:

[0011] An adjustable prototype test device for pipe roof structure components includes a reaction frame, a sliding support, a loading test box, and a vertical loading mechanism;

[0012] The reaction frame is a frame body formed by connecting corner columns, upper horizontal crossbeams, and lower horizontal crossbeams. Between every two adjacent corner columns, an intermediate column parallel to them is arranged, and the upper and lower ends of the intermediate column are slidably matched with the upper and lower horizontal crossbeams; multiple groups of positioning holes are reserved vertically on the corner columns and intermediate columns;

[0013] The sliding support includes a base slide rail, supports, and base jacks. Two base slide rails are arranged in parallel, and the two ends of the base slide rail are respectively slidably connected to the opposite two lower horizontal crossbeams. Two supports are slidably arranged on the base slide rail, and the model component is fixedly installed on the two supports; between the two ends of the base slide rail and the two supports, horizontal slide rail end jacks are respectively provided to adjust the position of the supports; between the base slide rail and the corresponding other two lower horizontal crossbeams, horizontal base jacks are respectively provided, and the base jacks act vertically on the base slide rail to move the base slide rail on the corresponding two lower horizontal crossbeams;

[0014] The loading test chamber includes a box body with open upper and lower ends formed by enclosing four side wall plates. The outside of each side wall plate is connected to the positioning holes on the reaction frame through a number of horizontally arranged jacks; the lower open end of the loading test chamber corresponds to the model component on the sliding support; the loading test chamber is filled with standard sand during the test.

[0015] The vertical loading mechanism includes a loading cross beam, a vertical loading jack, and a loading plate. The two ends of the loading cross beam are connected to two opposite upper horizontal cross beams. The upper end of the vertical loading jack is slidably connected to the loading cross beam. The lower end of the vertical loading jack points to the upper open end of the loading test chamber, and the lower end of the vertical loading jack is detachably and fixedly connected to the loading plate.

[0016] The support includes two support bodies that are respectively slidably connected to two base slide rails. The two support bodies are connected by a base that spans the two base slide rails; the model component is directly erected on the two bases.

[0017] A chute is provided on the lower side of the support body for sliding connection with the base slide rail, and a positioning groove is provided on the upper side of the support body. Positioning blocks that protrude downward are respectively fixed at both ends of the base, and the positioning blocks are inserted into the positioning grooves.

[0018] Each side wall plate of the loading test chamber is vertically butted against the inner side of another adjacent side wall plate.

[0019] One end of the horizontal jack is connected to the reserved bolt hole on the side wall plate with a bolt, and the other end of the horizontal jack is connected to the reserved positioning holes on the middle column and the corner column through bolts.

[0020] The loading cross beam is of I-beam steel structure, and two long grooves of the loading cross beam are arranged horizontally opposite to each other; a T-shaped chute is provided at the upper end of the vertical loading jack for sliding connection with the loading cross beam.

[0021] The upper and lower horizontal cross beams are of I-beam steel structure, which is composed of two wing plates and a web connecting the two wing plates. Two long grooves are formed on both sides of the web, and the two long grooves of the upper and lower horizontal cross beams are arranged vertically opposite to each other.

[0022] The upper and lower ends of the middle column are embedded in the long grooves of the upper and lower horizontal cross beams and are slidably matched with them.

[0023] Two inverted U-shaped chutes are provided at both ends of the base slide rail, and the inverted U-shaped chutes are slidably sleeved on the wing plates of two opposite lower horizontal cross beams.

[0024] One end of the base jack is connected to the base slide rail through a bolt, and the other end of the base jack is provided with an inverted U-shaped card slot. The base jack is sleeved on the wing plate of the corresponding lower horizontal cross beam by the inverted U-shaped card slot.

[0025] The beneficial effects of the present invention:

[0026] The present invention can adjust the size of the loading test box according to the size of the model component, so as to realize the deformation and failure of the model component under the real load condition.

[0027] When the present invention is used, first, the model component is installed and fixed on the base of the sliding support. Secondly, according to the model size, the four side wall plates of the loading test box are fixed by the horizontal jacks on the outside. Thirdly, the loading test box is filled with standard sand and compacted. The loading plate is placed on the plane of the standard sand in the loading test box. Finally, the vertical loading jack is used to apply a load on the loading plate, so that the model component is deformed under load, and its failure mode and related parameters are monitored.

[0028] The present invention simulates and realizes the deformation and failure of the pipe roof model component under the real load, and further explores its failure mode and parameter influence, providing a theoretical basis for the optimal design of the pipe roof structure.

[0029] The present invention can realize the mechanical test of the local pipe roof structure, providing a theoretical basis for the optimization of the pipe roof structure, with a view to optimizing the structural design and improving the overall efficiency. Description of the Drawings

[0030] Figure 1 is the schematic diagram of the overall structure of the present invention;

[0031] Figure 2 is the schematic diagram of the structure of the present invention after removing the loading test box;

[0032] Figure 3 is the schematic diagram of the structure of the sliding support in the present invention;

[0033] Figure 4 is the schematic diagram of the structure of the support main body in the present invention;

[0034] Figure 5 is the schematic diagram of the structure of the loading test box in the present invention;

[0035] Figure 6 is the schematic diagram of the structure of the vertical loading mechanism in the present invention;

[0036] Figure 7 is the connection schematic diagram of the horizontal jack and the middle column in the present invention;

[0037] Figure 8 is the connection schematic diagram of the base jack and the lower horizontal cross beam in the present invention. Detailed Embodiments

[0038] The following further describes the detailed embodiments of the present invention with reference to the drawings.

[0039] As Figures 1 to 8As shown in the figure, an adjustable prototype test device for a pipe curtain structure member in this embodiment includes a reaction frame 1, a sliding support 18, a loading test box 22, and a vertical loading mechanism 21.

[0040] The reaction frame 1 is a cuboid frame, including four vertical corner columns 3. The upper ends of the four corner columns 3 are interconnected by four upper horizontal beams 2, and the lower ends of the four corner columns 3 are interconnected by four lower horizontal beams 6. Moreover, an intermediate column 4 parallel to it is arranged between every two adjacent corner columns 3, and the upper and lower ends of the intermediate column 4 are slidably engaged with the upper horizontal beam 2 and the lower horizontal beam 6.

[0041] In this embodiment, both ends of the corner column 3 are bolted to the upper horizontal beam 2 and the lower horizontal beam 6.

[0042] Multiple groups of positioning holes are reserved vertically on the corner column 3 and the intermediate column 4. In this embodiment, the positioning holes are bolt holes, and the corner column 3 and the intermediate column 4 are reserved with two positioning holes horizontally distributed as a group and equally spaced vertically.

[0043] The sliding support 18 includes a base slide rail 12, a support, and a base jack 17. Two base slide rails 12 are arranged in parallel, and both ends of the base slide rail 12 are slidably connected to two opposite lower horizontal beams 6 respectively. Two supports are slidably arranged on the base slide rail 12, and the model member 14 is fixedly installed on the two supports.

[0044] Horizontal base jacks 17 are respectively arranged between the base slide rail 12 and the other two corresponding lower horizontal beams to adjust the horizontal position of the base slide rail by changing the range of the base jack 17 and realize the adjustment of the horizontal displacement of the sliding support. During specific adjustment, the base jack 17 acts vertically on the base slide rail 12 to move the base slide rail 12 on the two corresponding lower horizontal beams.

[0045] In this embodiment, the support includes two support bodies 13 respectively slidably connected to the two base slide rails. The two support bodies 13 are connected by a base 20 straddling the two base slide rails 12; the model member 14 is directly installed on the two bases 20.

[0046] Horizontal slide rail end jacks 16 are respectively arranged between both ends of the base slide rail 12 and the support body to adjust the position of the support.

[0047] The lower side of the support body 13 is provided with an inverted U-shaped chute for sliding connection with the base slide rail 12, and the upper side of the support body 13 is provided with a positioning groove in the shape of a hexahedron square hole. Positioning blocks protruding downward are respectively fixed at both ends of the base 20, and the positioning blocks are inserted into the positioning grooves. During specific installation, the width of the inverted U-shaped chute of the support body 13 is slightly wider than the width of the base slide rail 12, and the positioning groove should be slightly larger than the actual size of the positioning block.

[0048] In this embodiment, the upper horizontal beam 2 and the lower horizontal beam 6 are I-shaped steel structures, which are composed of two wing plates and a web connecting the two wing plates. Two long grooves are formed on both sides of the web, and the two long grooves of the upper and lower horizontal beams 6 are arranged vertically opposite to each other.

[0049] During specific installation, the upper and lower ends of the middle column 4 are embedded in the long grooves of the upper and lower horizontal beams and are slidably matched with them, so as to enable horizontal movement.

[0050] During specific installation, two inverted U-shaped sliding grooves 19 are provided at both ends of the base slide rail 12, and the inverted U-shaped sliding grooves 19 are slidably sleeved on the wing plates of the two opposite lower horizontal beams, so as to enable horizontal movement.

[0051] During specific installation, two parallel base jacks 17 are respectively provided on each side. One end of the base jack 17 is bolted to the base slide rail 12, and the other end of the base jack 17 is provided with an inverted U-shaped clamping groove 23. The base jack is sleeved on the wing plate of the corresponding lower horizontal beam through the inverted U-shaped clamping groove 23, so as to enable horizontal movement. Moreover, the internal dimension of the inverted U-shaped clamping groove 23 of the base jack is slightly larger than the thickness of the wing plate of the lower horizontal beam, and the gap between the two is filled with a rubber pad.

[0052] The loading test box 22 includes a box body with upper and lower openings formed by enclosing four side wall plates 7. The outside of each side wall plate 7 is connected to the positioning holes on the reverse frame through a number of horizontally arranged jacks 10; the lower opening of the loading test box 22 corresponds to the model component 14 on the sliding support; the loading test box 22 is filled with standard sand during the test.

[0053] The relative positions of the side wall plates 7 are controlled by the horizontally arranged jacks 10, and the size of the test box is adjusted by adjusting the horizontal, vertical positions and ranges according to the size of the test box.

[0054] In this embodiment, each side wall plate of the loading test box 22 is vertically butted against the inner side of another adjacent side wall plate, so as to facilitate adjustment.

[0055] In this embodiment, the side wall plates are selected as steel plates with ribs on the outside.

[0056] In this embodiment, one end of the horizontally arranged jack 10 is bolted to the bolt holes reserved on the side wall plate 7, and the other end of the horizontally arranged jack is bolted to the positioning holes reserved on the corner column 3 and the middle column 4. The horizontally arranged jack 10 provides horizontal and vertical supports for the side wall plate 7 to form the loading test box 22. The horizontally arranged jack 10 realizes the height adjustment of the side wall plate 7 by adjusting the connection position in the positioning hole. At the same time, the horizontally arranged jack 10 expands and contracts to realize the size and horizontal position adjustment of the loading test box 22.

[0057] The vertical loading mechanism 21 includes a loading crossbeam 5, vertical loading jacks 11 and a loading plate 9. Both ends of the loading crossbeam 5 are fixedly connected to two opposite upper horizontal crossbeams 2 by bolts. Two vertical loading jacks 11 are arranged in parallel. The upper ends of the vertical loading jacks 11 are slidably connected to the loading crossbeam 5. The lower ends of the vertical loading jacks 11 point to the upper opening of the loading test box 22, and the lower ends of the vertical loading jacks 11 are detachably and fixedly connected to the loading plate 9.

[0058] In this embodiment, the loading crossbeam 5 is of I-beam steel structure, and two long grooves of the loading crossbeam are arranged horizontally opposite to each other; the upper ends of the vertical loading jacks 11 are provided with T-shaped sliding grooves and are slidably connected to the loading crossbeam 5.

[0059] In this embodiment, the loading plate 9 is connected to the vertical loading jack 11 by bolts. After adjusting the range of the horizontal jacks to form a new size of the loading test box, a new loading steel plate can be replaced to match it.

[0060] When the model component 14 of this embodiment is installed, the lower end of the model component 14 is welded to the base 20, and the positioning blocks on the lower side of the base 20 are inserted into the positioning grooves inside the upper part of the support body 19.

[0061] When this embodiment is in use, first, the model component 14 is fixed on the base 20 of the sliding support 18, and the ranges of the base jack 17 and the rail end jack 16 are adjusted to fix the position of the support; then, according to the position of the model component 14, the position of the side wall plate 7 is determined by adjusting the range of the horizontal jack 10, and the side wall plate 7 is installed at the end of the jack connected to it to form a closed loading test box 22; then, standard sand is filled and compacted in the loading test box 22; finally, a vertical load is applied through the vertical loading mechanism 21 at the top of the loading test box 22 (the loading plate 9 is placed on the standard sand plane in the loading test box, and finally a load is applied on the loading plate through the vertical loading jack 11), so that the model component is deformed under load, and its failure mode and related parameters are monitored. The device can adjust the size of the loading test box according to the size of the model component, and realize the deformation and failure of the model component under the real soil load condition.

[0062] Through the adjustable test box of the present invention, the deformation and failure mode generated by different-sized pipe roof with lock test components under the action of simulated real soil load can be accurately measured, providing a theoretical basis for the optimal design of the components.

[0063] The present invention can realize the mechanical test of the local pipe roof structure, provide a theoretical basis for the optimization of the pipe roof structure, in order to optimize the structural design and improve the overall efficiency.

[0064] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be modified or equivalently replaced, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

[0065] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protected content of the present invention.

Claims

1. An adjustable prototype test device for pipe curtain structure components, Characterized in that: It includes a reaction frame, a sliding support, a loading test box and a vertical loading mechanism; The reaction frame is a frame body formed by connecting corner columns, upper horizontal cross beams and lower horizontal cross beams. Between every two adjacent corner columns, intermediate columns parallel to them are arranged. The upper and lower ends of the intermediate columns are slidably matched with the upper and lower horizontal cross beams; multiple groups of positioning holes are reserved vertically on the corner columns and intermediate columns; The sliding support includes base slide rails, supports and base jacks. Two base slide rails are arranged in parallel, and the two ends of the base slide rails are respectively slidably connected to the opposite two lower horizontal cross beams. Two supports are slidably arranged on the base slide rails, and the model component is fixedly installed on the two supports; Horizontal slide rail end jacks are respectively arranged between the two ends of the base slide rails and the two supports to adjust the position of the supports; Horizontal base jacks are respectively arranged between the base slide rails and the other two corresponding lower horizontal cross beams. The base jacks act vertically on the base slide rails to move the base slide rails on the corresponding two lower horizontal cross beams; The loading test box includes a box body with upper and lower openings enclosed by four side wall plates. The outside of each side wall plate is connected to the positioning holes on the reaction frame through a number of horizontally arranged jacks; the lower opening of the loading test box corresponds to the model component on the sliding support; The loading test box is filled with standard sand during the test; The vertical loading mechanism includes a loading cross beam, a vertical loading jack and a loading plate. The two ends of the loading cross beam are connected to the opposite two upper horizontal cross beams. The upper end of the vertical loading jack is slidably connected to the loading cross beam. The lower end of the vertical loading jack points to the upper opening of the loading test box, and the lower end of the vertical loading jack is detachably and fixedly connected to the loading plate; Each side wall plate of the loading test box is vertically butted against the inner side of another adjacent side wall plate; One end of the horizontal jack is connected to the bolt hole reserved on the side wall plate with bolts, and the other end of the horizontal jack is connected to the positioning holes reserved on the intermediate column and the corner column through bolts.

2. An adjustable prototype test device for pipe curtain structure components according to claim 1, Characterized in that: The support includes two support bodies respectively slidably connected to the two base slide rails. The two support bodies are connected by a base spanning the two base slide rails; the model component is directly installed on the two bases.

3. An adjustable prototype test device for pipe curtain structure components according to claim 2, Characterized in that: A chute is provided on the lower side of the support body for sliding connection with the base slide rail, and a positioning groove is provided on the upper side of the support body. Positioning blocks protruding downward are respectively fixed at both ends of the base, and the positioning blocks are inserted into the positioning grooves.

4. An adjustable prototype test device for pipe curtain structure components according to claim 1, Characterized in that: The loading cross beam is of I-shaped steel structure, and two long grooves of the loading cross beam are arranged horizontally opposite to each other; A T-shaped chute is provided at the upper end of the vertical loading jack for sliding connection with the loading cross beam.

5. An adjustable prototype test device for pipe curtain structure components according to any one of claims 1-4, Characterized in that: The upper and lower horizontal crossbeams are of I-beam steel structure, which is composed of two flange plates and a web connecting the two flange plates. Two long grooves are formed on both sides of the web, and the two long grooves of the upper and lower horizontal crossbeams are arranged vertically opposite to each other.

6. An adjustable prototype test device for a pipe curtain structure member according to claim 5, characterized in that: The upper and lower ends of the middle column are embedded in the long grooves of the upper and lower horizontal crossbeams and are slidably matched with them.

7. An adjustable prototype test device for a pipe curtain structure member according to claim 5, characterized in that: Both ends of the base slide rail are provided with two inverted U-shaped sliding grooves, and the inverted U-shaped sliding grooves are slidably sleeved on the flange plates of the two opposite lower horizontal crossbeams.

8. An adjustable prototype test device for a pipe curtain structure member according to claim 5, characterized in that: One end of the base jack is connected to the base slide rail by bolts, and the other end of the base jack is provided with an inverted U-shaped card slot. The base jack is sleeved on the flange plate of the corresponding lower horizontal crossbeam by the inverted U-shaped card slot.

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