Grouting test device for simulating secondary lining concrete defects

Abstract

The utility model discloses a grouting test device for simulating secondary lining concrete defects, which comprises a test platform, a small-sized grouting machine fixed on the test platform and adjustable in grouting pressure, and further comprises a defective concrete test piece test mold, the small-sized grouting machine is connected with the defective concrete test piece test mold through a grouting pipe, and the defective concrete test piece test mold is connected with the small-sized grouting machine through a grouting pipe. A pressure gauge is arranged on the grouting pipe and is connected with data collection equipment; the defective concrete test piece test mold comprises a bottom plate, an I-shaped side plate, an II-shaped side plate, a top plate, a grouting hole and an exhaust hole support which are detachably connected through a groove and a threaded pull rod, and supporting legs and wheels are further arranged at the bottom of the test platform. According to the utility model, the grouting pressure can be accurately controlled, the concrete test pieces with different defects are manufactured through the defective concrete test piece test mold, and the concrete test pieces with different defects are simulated to finish secondary lining in-mold grouting at different solidification stages by utilizing different grouting pressures; and a test sample and test data are provided for research of tunnel secondary lining in-mold grouting and defect repair engineering.

Description

Technical Field

[0001] This utility model relates to the field of tunnel secondary lining grouting technology and simulation test technology, and in particular to a grouting test device for simulating defects in secondary lining concrete. Technical Background

[0002] The secondary lining grouting technology with formwork has been widely used in railway tunnel construction. It has a good effect on preventing the secondary lining arch from becoming void. The secondary lining arch grouting technology first requires the design and modification of the secondary lining trolley. Grouting holes are set in the arch of the lining trolley formwork, and auxiliary facilities for grouting are installed. Grouting pipes are pre-embedded before pouring concrete. The technology is to grout the void in the secondary lining arch without removing the formwork after the secondary lining concrete is poured.

[0003] Voids or non-compactness in the secondary lining concrete structure reduce the tunnel's load-bearing capacity and durability, posing a threat to its safety. Simulation testing is a crucial means to study defect formation methods, optimal grouting pressure, and the detection of grouting processes and effects. To achieve accurate and visualized grouting simulation tests for secondary lining defects, the key lies in the precise design of the defect specimen formation and the grouting system, as well as the scientific control of its parameters.

[0004] Grouting pressure is a key parameter in grouting with formwork, directly affecting the grouting effect and the mechanical properties of concrete. Currently, extensive research and improvements have been made in construction methods and testing techniques, but studies on the impact of different grouting pressures on concrete strength are relatively limited. Therefore, researching the influence of grouting pressure with formwork on the mechanical properties of concrete in tunnel secondary lining defect repair projects has significant practical implications. Utility Model Content

[0005] The purpose of this invention is to provide a grouting test device for simulating defects in secondary lining concrete. It can be used to prepare concrete specimens with different defects and simulate the secondary lining grouting at different solidification stages using different grouting pressures. This provides test samples and test data for experimental research on tunnel secondary lining grouting and defect repair engineering.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A grouting test device for simulating defects in secondary lining concrete includes a test platform with a small grouting machine fixed on it. The grouting pressure of the small grouting machine is adjustable. The device also includes a defective concrete specimen mold with a modular design and detachable connections between modules. The small grouting machine is connected to the defective concrete specimen mold via a grouting pipe. A pressure gauge is installed on the grouting pipe and connected to a data collection device.

[0008] Furthermore, the defective concrete specimen mold has an overall cubic structure, including a bottom plate, type I side plates, type II side plates, a top plate, and supports for grouting holes and vents. Two type I side plates and two type II side plates are provided, and the bottom plate, type I side plates, type II side plates, top plate, and supports for grouting holes and vents are detachably connected. The type I side plates are flat plates without grooves, and the inner side of the type II side plates has two symmetrical vertical grooves, the width of which is greater than the thickness of the type I side plates. The type I side plates and type II side plates are perpendicularly connected and form a rectangular internal space. The type I side plates are fitted between the grooves of the two type II side plates. The bottom plate has four grooves that can accommodate the type I side plates and type II side plates. The side plates are vertically inserted into the grooves. Type I and Type II side plates are vertically inserted into the grooves of the base plate. The bottom of the grooves on both the Type II side plate and the base plate is provided with sealing strips. The top plate is vertically set on top of the Type I and Type II side plates. The bottom of the top plate is also provided with a groove. The grooves of the top plate and the base plate are the same size. The top plate is provided with a first grouting port and a first venting port. The grouting port and venting port bracket is provided with a connecting joint. The connecting joint is provided with a second grouting port and a second venting port. The second grouting port is connected to the first grouting port. The second venting port is connected to the first venting port. The grouting port and venting port bracket is set on the upper part of the top plate. The connecting joint is connected to the grouting pipe.

[0009] The mold for defective concrete specimens adopts a modular design. By setting grooves on the modular base plate, Type I side plate, Type II side plate, top plate, grouting hole and vent hole supports, the various parts are cleverly connected and fixed together. In order to ensure that the groove joints are tight and airtight during grouting, a sealing strip is set at the bottom of each groove.

[0010] Furthermore, the edges of the Type II side plates, top plate, bottom plate, grouting holes, and venting hole supports are all provided with tie rod holes. The two Type II side plates are connected by double-threaded tie rods, which pass through the tie rod holes on the Type II side plates, and both ends of the double-threaded tie rods are provided with ring nuts. The top plate, bottom plate, grouting holes, and venting hole supports are connected by single-threaded tie rods, which pass through the tie rod holes on the top plate, bottom plate, and grouting holes and venting hole supports, with a ring nut provided at the threaded end and the threaded end located on one side of the top plate and the grouting holes and venting hole supports.

[0011] The connection between the two Type II side plates, the bottom plate and the top plate, and the grouting hole and the vent hole support is reinforced by threaded tie rods. This makes it less likely for the defective concrete specimen mold to leak grout when pouring concrete or simulating secondary lining grouting. It provides a sealed space, and the design of the ring nut makes it easier to adjust.

[0012] Furthermore, the grouting hole and venting hole support includes a square connecting base plate, on which a cylindrical protrusion is provided, and a second grouting port and a second venting port are provided inside the cylindrical protrusion, penetrating the cylindrical protrusion and the square connecting base plate.

[0013] The grouting hole and vent support serve two purposes. First, they position the grouting holes and vents. When casting defective concrete specimens, steel bars or round pipes are inserted into the concrete defects. Once the concrete has initially set, the steel bars or round pipes are pulled out, thus forming the grouting holes and vents. Second, they connect the grouting pipes. The support can be connected to the grouting pipes via a connector for grouting.

[0014] Preferably, the mold for the defective concrete specimen is made of steel plate.

[0015] The steel plate design of the defective concrete specimen mold makes it less prone to damage during disassembly, and it can be reused multiple times, which saves resources and is more environmentally friendly.

[0016] Preferably, the test platform is provided with support legs at the bottom, and casters are provided at the ends of the support legs.

[0017] The test platform is designed to be mobile, making it easy to move. It can be pushed to the designated position during the test and pushed back after the test is completed.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention utilizes a small, adjustable-pressure grouting machine and a pressure gauge with detection and recording functions to precisely control the grouting pressure. It can simulate grouting of the secondary lining with formwork under different grouting pressures, thus providing reliable test samples and data for experimental research on tunnel secondary lining grouting and defect repair projects.

[0020] In this utility model, the defective concrete specimen mold is made of steel plate and adopts a modular design. The bottom plate, type I side plate, type II side plate, top plate, grouting hole and vent hole support are all detachably connected by grooves and threaded tie rods, which facilitates disassembly and adjustment. After the defective concrete specimen has solidified, each part can be disassembled to easily remove the specimen. The steel plate design makes it less prone to damage during disassembly and can be reused multiple times.

[0021] The novel defective concrete specimen mold is reasonably and ingeniously designed to produce different types of defective concrete specimens. The grouting hole and vent hole brackets provide precise positioning for the grouting holes and vent holes, and facilitate connection with the grouting pipe. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the test device according to an embodiment of the present invention;

[0023] Figure 2 This is a front view of the mold for a defective concrete specimen according to an embodiment of this utility model;

[0024] Figure 3This is a top view of the mold for a defective concrete specimen according to an embodiment of this utility model;

[0025] Figure 4 for Figure 3 Enlarged schematic diagram of part I;

[0026] Figure 5 This is a schematic diagram of the base plate structure of the defective concrete specimen mold in an embodiment of this utility model;

[0027] Figure 6 This is a schematic diagram of the top plate structure of the mold for the defective concrete specimen in an embodiment of this utility model;

[0028] Figure 7 This is a schematic diagram of the side plate structure of the Type II mold for defective concrete specimens according to an embodiment of this utility model;

[0029] Figure 8 This is a schematic diagram of the support structure for the grouting hole and vent hole of the defective concrete specimen mold in an embodiment of this utility model;

[0030] Reference numerals: 1. Test platform; 2. Small grouting machine; 3. Defective concrete specimen mold; 3-1. Base plate; 3-2. Type I side plate; 3-3. Type II side plate; 3-4. Top plate; 3-4-1. First grouting port; 3-4-2. First vent; 3-5. Grouting hole and vent support; 3-5-1. Square connecting base plate; 3-5-2. Connecting joint; 3-5-3. Second grouting port; 3-5-4. Second vent; 3-6. Groove; 3-7. Sealing strip; 3-8. Tie rod hole; 3-9. Double-threaded tie rod; 3-10. Ring nut; 3-11. Single-threaded tie rod; 4. Pressure gauge; 5. Data cable; 6. Data collection equipment; 7. Support leg; 8. Caster wheel; 9. Reinforcing bar. Detailed Implementation

[0031] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] like Figure 1 As shown, a grouting test device for simulating defects in secondary lining concrete includes a test platform 1, on which a small grouting machine 2 is fixed. The grouting pressure of the small grouting machine 2 is adjustable. It also includes a detachable defective concrete specimen mold 3. The small grouting machine 2 is connected to the defective concrete specimen mold 3 through a grouting pipe 4. A pressure gauge 5 is provided on the grouting pipe 4. The pressure gauge 5 is connected to a data collection device 7 through a data cable 6.

[0033] like Figures 2 to 8 As shown, the defective concrete specimen mold 3 has a cubic structure, including a bottom plate 3-1, type I side plate 3-2, type II side plate 3-3, top plate 3-4, and grouting hole and vent support 3-5, all of which are made of steel plates. Two Type I side plates 3-2 and two Type II side plates 3-3 are provided. Type I side plates 3-2 are flat plates without grooves. Type II side plates 3-3 have two symmetrical vertical grooves 3-6 on their inner sides. The width of the grooves 3-6 is greater than the thickness of the Type I side plates 3-2. The Type I side plates 3-2 and Type II side plates 3-3 are vertically connected and form a square internal space. The Type I side plates 3-2 are fitted between the grooves 3-6 of the two Type II side plates. The bottom plate 3-1 has four grooves 3-6 that allow the Type I side plates 3-2 and Type II side plates 3-3 to be inserted vertically. The Type I side plates 3-2 and Type II side plates 3-3 are vertically fitted into the grooves 3-6 of the bottom plate 3-1. The top plate 3-4 is vertically positioned on top of the Type I side plates 3-2 and Type II side plates 3-3. The top plate 3-4 also has a groove 3-6 at the bottom. The top plate 3-4 and the bottom plate 3-1 have the same external dimensions and groove 3-6 dimensions. The top plate 3-4 has a first grouting port 3-4-1 and a first venting port 3-4-2. The bottom of the groove 3-6 on the type II side plate 3-3, bottom plate 3-1 and top plate 3-4 are all provided with sealing strips 3-7. The grouting hole and venting hole support 3-5 is provided with a connecting joint 3-5-2, and a second grouting port 3-5-3 and a second venting port 3-5-4 that are connected to the first grouting port 3-4-1 and the first venting port 3-4-2. During grouting, the grouting hole and venting hole support 3-5 is set on the upper part of the top plate 3-4, and the connecting joint 3-5-1 is connected to the grouting pipe 4.

[0034] The connection method between the base plate 3-1, type I side plate 3-2, type II side plate 3-3, top plate 3-4, and grouting hole and vent hole support 3-5 is as follows:

[0035] The edges of the Type II side plate 3-3, top plate 3-4, bottom plate 3-1, and grouting hole and venting hole support 3-5 are all provided with tie rod holes 3-8. The two Type II side plates 3-3 are connected by double-ended threaded tie rods 3-9. The double-ended threaded tie rods 3-9 pass through the tie rod holes 3-8 on the Type II side plate 3-3, and both ends of the double-ended threaded tie rods 3-9 are provided with ring nuts 3-10. The top plate 3-4, bottom plate 3-1, and grouting hole and venting hole support 3-5 are connected by single-ended threaded tie rods 3-11. The single-ended threaded tie rods 3-11 pass through the tie rod holes 3-8 on the top plate 3-4, bottom plate 3-1, and grouting hole and venting hole support 3-5. The threaded end is provided with a ring nut 3-10, and the threaded end is located on one side of the top plate 3-4 and the grouting hole and venting hole support 3-5.

[0036] In this embodiment, the grouting hole and venting hole support 3-5 includes a square connecting base plate 3-5-1. The square connecting base plate 3-5-1 is provided with a cylindrical protrusion. The square connecting base plate 3-5-1 and the cylindrical protrusion are fixed by welding. The cylindrical protrusion is threaded with pipe threads as a connecting joint 3-5-2. The connecting joint 3-5-2 has a second grouting port 3-5-3 and a second venting port 3-5-4 at its center. The second grouting port 3-5-3 and the second venting port 3-5-4 pass through the square connecting base plate 3-5-1. The second grouting port 3-5-3 corresponds to the first grouting port 3-4-1 on the top plate 3-4. The second venting port 3-5-4 corresponds to the first venting port 3-4-2 on the top plate 3-4.

[0037] In this embodiment, the bottom of the test platform 1 is also provided with support legs 8, and the ends of the support legs 8 are provided with casters 9 for easy movement.

[0038] Instructions for use in this embodiment:

[0039] First, according to the required dimensions of the defective specimen, the base plate 3-1, type I side plate 3-2, type II side plate 3-3, top plate 3-4, and grouting hole and vent support 3-5 of the defective concrete specimen mold 3 are prepared. Then, the type I side plate 3-2, type II side plate 3-3 and top plate 3-4 are connected. The type I side plate 3-2 and type II side plate 3-3 are vertically inserted into the groove 3-6 on the base plate 3-1. Then, they are fixed with double-ended threaded tie rod 3-9 and ring nut 3-10. Then, the testers use shovels to start pouring concrete specimens with cement mortar. The preparation method of concrete specimens with different types of defects is different.

[0040] After the concrete is poured, the grouting hole and venting hole bracket 3-5 is placed on top of the type I side plate 3-2 and type II side plate 3-3. Then, the base plate 3-1 is connected and fixed to the grouting hole and venting hole bracket 3-5 using the single-threaded tie rod 3-11 and the ring nut 3-10. The steel bar 9 and the water pipe are inserted into the second grouting port 3-5-3 and the second venting hole 3-5-4 on the grouting hole and venting hole bracket 3-5, with the insertion depth being the location of the defect. When the concrete has initially set, the steel bar 9 and the water pipe are pulled out to form the grouting hole and venting hole at the concrete defect.

[0041] When the concrete has initially set, remove the reinforcing bar 9 and the water pipe, and at the same time remove the grouting hole and vent support 3-5. Then install the top plate 3-4, and install the grouting hole and vent support 3-5 on the top plate 3-4. Connect it with the ring nut 3-10 and the single-threaded tie rod 3-11, and wait for grouting. The grouting time selected for the test is when the concrete is initially set, during the initial setting-final setting interval, and after final setting.

[0042] The pressure adjustment function of the small grouting machine 2 can control the grouting pressure, thereby enabling specimens with the same defects to be grouted with different grouting pressures, thus allowing the study of the effect of different grouting pressures on the secondary lining grouting.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A grouting test device simulating defects of two-liner concrete, comprising a test platform, characterized in that, The test platform is fixed with a small grouting machine, the grouting pressure of the small grouting machine can be adjusted, and the test platform also comprises a defective concrete test piece test mold, the defective concrete test piece test mold adopts a modular design, the small grouting machine is connected with the defective concrete test piece test mold through a grouting pipe, a pressure gauge is arranged on the grouting pipe, and the pressure gauge is connected with a data collection device.

2. The grouting test device for simulating a concrete defect of a double lining according to claim 1, characterized by, The defective concrete test piece test mold comprises a bottom plate, I-shaped side plates, II-shaped side plates, a top plate, grouting hole and exhaust hole supports, two I-shaped side plates and two II-shaped side plates are arranged, the I-shaped side plate is a flat plate without a groove, two vertical grooves are symmetrically arranged on the inner side of the II-shaped side plate, the two sides of the I-shaped side plate are connected with the grooves on the two II-shaped side plates respectively, and the I-shaped side plate and the II-shaped side plate form a rectangular internal space together; grooves are also arranged on the bottom plate and the top plate, the I-shaped side plate and the II-shaped side plate are vertically clamped in the grooves of the bottom plate and the top plate, and the top plate is provided with a first grouting port and a first exhaust port, and a sealing rubber strip is arranged at the bottom of all the grooves; the grouting hole and the exhaust hole support are arranged on the top of the top plate, and a connecting joint for connecting with the grouting pipe is arranged on the grouting hole and the exhaust hole support, the connecting joint is internally provided with a second grouting port and a second exhaust port, the second grouting port is in communication with the first grouting port, and the second exhaust port is in communication with the first exhaust port.

3. The grouting test device for simulating a concrete defect of a double lining according to claim 2, characterized in that, The edges of the II-shaped side plates, the top plate, the bottom plate, the grouting hole and the exhaust hole support are provided with pull rod holes, the two II-shaped side plates are connected through double-end screw thread pull rods, the double-end screw thread pull rods pass through the pull rod holes on the II-shaped side plates, and annular nuts are arranged at the two ends of the double-end screw thread pull rods; the top plate, the bottom plate, the grouting hole and the exhaust hole support are connected through single-end screw thread pull rods, the single-end screw thread pull rods pass through the pull rod holes on the top plate, the bottom plate and the grouting hole and the exhaust hole support, an annular nut is arranged at a threaded end, and the threaded end is arranged on one side of the top plate and the grouting hole and the exhaust hole support.

4. The grouting test device for simulating a concrete defect of a secondary liner according to claim 2 or 3, characterized in that, The grouting hole and the exhaust hole support comprise a square connecting bottom plate, a cylindrical protrusion is arranged on the square connecting bottom plate, and a second grouting port and a second exhaust port penetrating the cylindrical protrusion and the square connecting bottom plate are arranged in the cylindrical protrusion.

5. The grouting test device for simulating concrete defects of a secondary liner according to claim 2, wherein The defective concrete test piece test mold is made of a steel plate.

6. The grouting test device for simulating concrete defects of a secondary liner according to claim 1, wherein The test platform is provided with supporting legs at the bottom, and universal wheels are arranged at the ends of the supporting legs.

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