Device and method for testing compression resistance and impermeability of plugging material for reserved seam of structure

Abstract

The invention relates to the technical field of waterproofing of tunnel engineering, and discloses a device and a method for testing compression resistance and impermeability of a plugging material for a reserved seam of a structure, and the device comprises a concrete test piece, a box body and a loading mechanism, the test cavity is internally provided with a plugging material layer and pressurized liquid for carrying out compression resistance and impermeability test on the plugging material layer; the box body is connected with a concrete test piece, and the bottom of the box body is open and covers the test cavity; according to the subway tunnel deformation joint leakage testing device, the actual working condition can be simulated, the water stopping effect of the caulking material can be scientifically evaluated, and the subway tunnel deformation joint leakage testing device becomes the key for solving the problem of subway tunnel deformation joint leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproofing for tunnel engineering, and particularly to a test device and test method for the compressive and impermeable properties of a structural reserved joint sealing material. Background Art

[0002] With the increasing mileage of rail transit tunnels put into operation in China year by year, the problems of subway tunnel structure diseases are becoming increasingly serious, and the leakage disease is the most common. Tunnel leakage not only weakens the performance of the structure itself, changes the external stress state, reduces the overall stability and safety reserve, but also may cause internal facility failures, seriously affecting the train operation and passenger safety. Due to the complex structure form and large deformation amplitude of the detailed structural parts such as tunnel deformation joints, they have become high-incidence areas of leakage. However, the leakage treatment of these parts is difficult and the recurrence rate of leakage is high, which puts higher requirements on the treatment process and materials.

[0003] At present, there is a lack of scientific and systematic evaluation methods and experimental devices for the compressive and impermeable water-stop effects of the caulking materials for subway tunnel deformation joints, which seriously restricts the progress of leakage treatment technologies. Existing research mostly focuses on the performance testing of the materials themselves, while ignoring the evaluation of the anti-leakage effects of the caulking materials under actual water-bearing operation conditions.

[0004] Therefore, there is an urgent need for a test device and test method for the compressive and impermeable properties of a structural reserved joint sealing material. Summary of the Invention

[0005] The purpose of the present invention is to provide a test device and test method for the compressive and impermeable properties of a structural reserved joint sealing material, aiming to solve or improve at least one of the above technical problems.

[0006] To achieve the above purpose, the present invention provides the following solution: The present invention provides a test device for the compressive and impermeable properties of a structural reserved joint sealing material, including:

[0007] A concrete specimen, provided with a through test cavity, in which a sealing material layer and a pressurized liquid for performing a compressive and impermeable property test on the sealing material layer are arranged;

[0008] A box body, connected to the concrete specimen, with the bottom of the box body being open and covering the test cavity;

[0009] A loading mechanism, communicated with the box body, and the loading mechanism is used to pressurize the pressurized liquid.

[0010] Optionally, the loading mechanism includes:

[0011] A piston sleeve, arranged on the box body, the piston sleeve is communicated with the inner cavity of the box body, and a piston press head is arranged in the piston sleeve;

[0012] A pressurizing device, connected to the piston press head.

[0013] Optionally, it further includes a temperature control device for adjusting the ambient temperature of the concrete specimen.

[0014] Optionally, the inner cavity of the box body is connected to a pipeline with a valve.

[0015] Optionally, an intelligent water pressure monitor is provided on the box body.

[0016] Optionally, the concrete specimen is provided with a groove for plugging into the side wall of the box body, and the groove covers the test cavity.

[0017] Optionally, a connecting piece is provided between the groove and the side wall of the box body.

[0018] Optionally, it further includes a slide rail, on which a pair of support platforms are slidably fitted, and a height adjustment device is provided on the support platforms for abutting against the bottom of the concrete specimen.

[0019] The present invention also provides a test method for the compressive and impermeable properties of a structural joint sealing material, including the following steps:

[0020] Connect the box body to the concrete specimen;

[0021] Inject the pressurizing liquid into the test cavity;

[0022] Pressurize the pressurizing liquid through the loading mechanism.

[0023] Optionally, when pressurizing the pressurizing liquid through the loading mechanism, a gradient pressurization method or a pressure holding method or a set pressurization frequency is adopted.

[0024] The present invention discloses the following technical effects:

[0025] 1. By preparing a concrete specimen with a test cavity approximating the actual working condition structure, pouring a sealing material layer in the test cavity, connecting and sealing the box body with an open bottom to the concrete specimen, injecting a pressurizing liquid into the test cavity, and pressurizing the pressurizing liquid through the transition of the box body by the loading mechanism, it can simulate the actual working condition and scientifically evaluate the water stop effect of the caulking material, which becomes the key to solving the problem of leakage at the deformation joints of subway tunnels.

[0026] 2. It can simulate conditions such as material caulking construction under different temperatures, different water pressure states, and different interface moisture contents, meeting the test requirements under complex working conditions.

[0027] 3. By preparing test chambers of different specifications, it is applicable to the compressive and impermeability performance tests of caulking materials for reserved gaps of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0029] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 is a schematic diagram of the box structure of the present invention;

[0031] Figure 3 is a schematic diagram of the concrete specimen structure of the present invention.

[0032] In the figure: 1, concrete specimen; 2, test chamber; 3, box; 4, piston sleeve; 5, piston head; 6, pipeline; 7, intelligent water pressure monitor; 8, groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0035] Referring to Figures 1 - 3 , the present invention provides a test device for the compressive and impermeability performance of a structural reserved joint sealing material, including:

[0036] A concrete specimen 1 is provided with a through test chamber 2. A caulking material layer and a pressurized liquid for performing compressive and impermeability performance tests on the caulking material layer are arranged in the test chamber 2;

[0037] A box 3 is connected to the concrete specimen 1, and the bottom of the box 3 is open and covers the test chamber 2;

[0038] A loading mechanism is connected to the box 3, and the loading mechanism is used to pressurize the pressurized liquid.

[0039] By preparing a concrete specimen 1 with a test chamber 2 approximating the structure under actual working conditions, pouring a sealing material layer into the test chamber 2, connecting and sealing a box body 3 with an open bottom to the concrete specimen 1, injecting pressurized liquid into the test chamber 2, and pressurizing the pressurized liquid through the transition of the box body 3 by a loading mechanism, it is possible to simulate actual working conditions and scientifically evaluate the water-stopping effect of the caulking material, which becomes the key to solving the problem of leakage at deformation joints of subway tunnels.

[0040] Furthermore, the sealing material layer can be asphalt-based materials, polyurethane-based materials, acrylate-based materials, and various caulking adhesives.

[0041] In an embodiment of the present invention, the loading mechanism includes:

[0042] A piston sleeve 4 is provided on the box body 3. The piston sleeve 4 is communicated with the inner cavity of the box body 3, and a piston head 5 is arranged in the piston sleeve 4;

[0043] A pressurizing device is connected to the piston head 5.

[0044] By controlling the pressure change rate with the pressurizing device, loading the piston head 5, and thus realizing the pressurization of the inner cavity of the box body 3 through the piston sleeve 4 communicated with the inner cavity of the box body 3, the pressurized liquid in the inner cavity of the box body 3 and the test chamber 2 is pressurized.

[0045] Furthermore, the center of the piston head 5 is aligned with the center of the box body 3 and the center of the test chamber 2 to avoid off-axis loading and other situations.

[0046] In an embodiment of the present invention, a temperature control device is further included for adjusting the ambient temperature of the concrete specimen 1.

[0047] Furthermore, the temperature control device and the loading device are integrated into a UTM multi-functional testing machine, which can accurately control the pressure loading speed or the loading frequency, thereby realizing the control of static water pressure and dynamic water pressure and the quantitative control of the loading environment temperature of the concrete specimen 1.

[0048] In an embodiment of the present invention, a pipeline 6 with a valve is communicated with the inner cavity of the box body 3. The pipeline 6 is a transparent pipeline, and the pipeline 6 is used to inject pressurized liquid into the box body 3, so that the pressurized liquid flows into the test chamber 2 and contacts the sealing material layer.

[0049] Furthermore, the pressurized liquid is mainly solutions such as pure water, acids, alkalis, and salts.

[0050] In an embodiment of the present invention, an intelligent water pressure monitor 7 is provided on the box body 3 to realize real-time monitoring of water pressure, thereby evaluating the compressive and impermeable properties of the material during the water pressure change process or the pressure holding process. The center point of the pipeline 6 is 200 mm higher than the center point of the connection channel of the intelligent water pressure monitor 7.

[0051] Further, a water level line is provided on the side wall of the box body 3. The water level line is located between the pipeline 6 and the intelligent water pressure monitor 7. The water level line is the injection mark for the pressurized liquid, which can prevent the liquid from overflowing from the pipeline 6 and prevent the intelligent water pressure monitor 7 from failing to monitor the water pressure.

[0052] In an embodiment of the present invention, a groove 8 for plugging into the side wall of the box body 3 is provided on the concrete specimen 1. The groove 8 covers the test cavity 2, and a connecting piece is provided between the groove 8 and the side wall of the box body 3.

[0053] The connecting piece is a high-strength structural adhesive, which is used to connect and fix the concrete specimen 1 and the box body 3, and make the inner cavity of the box body 3 in a sealed state.

[0054] Further, the box body 3 is rectangular, and the groove 8 is a loop structure adapted to the size of the side wall of the box body.

[0055] In an embodiment of the present invention, a slide rail is further included. A pair of support platforms are slidably matched on the slide rail, and a height adjusting device is provided on the support platform. The height adjusting device is used to abut against the bottom of the concrete specimen 1.

[0056] The slide rail is used to adjust the position of the support platform, so as to adjust the contact point of the height adjusting device on the support platform with respect to the concrete specimen 1. The height adjusting device is used to adjust the horizontal state of the concrete specimen 1 and lift the concrete specimen 1, so that the bottom of the test cavity 2 is suspended, which is convenient for observing the water seepage state of the sealing material layer.

[0057] Further, the box body 3 is made of transparent acrylic board, which is convenient for observing the state of the concrete specimen 1 and the change of the water level.

[0058] The present invention also provides a preparation process for the concrete specimen 1:

[0059] 1) Customize a mold to pour a loop-shaped concrete specimen 1. The height of the loop-shaped concrete specimen 1 is 100 mm, the size of the test cavity 2 is 100 mm in length, 30 mm - 80 mm in width, the width of the loop-shaped groove 8 is 5 mm, and the depth is 10 mm.

[0060] 2) After the concrete specimen 1 is poured and cured, use 80-mesh sandpaper to treat the surface mortar of the concrete.

[0061] 3) Immerse the concrete specimen 1 completely in water for 4 h at room temperature to make it fully infiltrated.

[0062] 4) Wipe off the water droplets on the inner surface of the concrete specimen 1 with a wet towel.

[0063] 5) Place the concrete specimen 1 in a thermo-hygrostat at 25°C and 30% humidity and let it stand. Every 15 minutes, use a concrete humidity tester to measure the humidity of the inner surface of the concrete on the inner side of the loop to quantitatively evaluate the compressive and impermeable properties of the caulking material poured under different interface moisture contents.

[0064] 6) After the moisture content of the inner interface of the loop-shaped concrete reaches the preset value, immediately pour the caulking material layer. The thickness of the caulking material layer is the variable, so as to quantitatively evaluate the influence of different caulking thicknesses on the compressive and impermeable properties of the material.

[0065] The present invention also provides a test method for the compressive and impermeable properties of a structural reserved joint sealing material, including the following steps:

[0066] Connect the box body 3 to the concrete specimen 1. Specifically, insert the box body 3 into the groove 8 and use high-strength structural glue for pressure bonding and sealing.

[0067] Inject pressurized liquid into the test chamber 2. Specifically, after the high-strength structural glue is cured, inject pressurized liquid into the box body 3 through the pipeline 6, and the pressurized liquid should reach the water level line.

[0068] Pressurize the pressurized liquid through the loading mechanism. Specifically, drive the piston ram 5 through the pressurizing device to pressurize the air in the box body 3, and then pressurize the pressurized liquid to perform a compressive and impermeable test on the caulking material layer. The water pressure when water starts to seep from the bottom of the concrete specimen 1 or the caulking material layer is extruded is used as the evaluation index.

[0069] In an embodiment of the present invention, when pressurizing the pressurized liquid through the loading mechanism, the gradient pressurization method or the pressure holding method or a set pressurization frequency is adopted.

[0070] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, 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 therefore should not be construed as a limitation to the present invention.

[0071] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. An experimental device for testing the compressive and impermeability properties of a structural reserved joint sealing material, characterized in that, Comprising: A concrete specimen (1) is provided with a through test cavity (2). A plugging material layer and a pressurized liquid for testing the compressive and impermeability performance of the plugging material layer are arranged in the test cavity (2). A box body (3) is connected to the concrete specimen (1). The bottom of the box body (3) is open and covers the test cavity (2). A loading mechanism is connected to the box body (3). The loading mechanism is used to pressurize the pressurized liquid.

2. The compressive and impermeable performance test device for a structural reserved joint sealing material according to claim 1, characterized in that, The loading mechanism includes: A piston sleeve (4) is arranged on the box body (3). The piston sleeve (4) is communicated with the inner cavity of the box body (3). A piston press head (5) is arranged in the piston sleeve (4). A pressurizing device is connected to the piston press head (5).

3. The compressive and impermeable performance test device for a structural reserved joint sealing material according to claim 1, characterized in that, It further includes a temperature control device for adjusting the ambient temperature of the concrete specimen (1).

4. The compressive and impermeable performance test device for a structural reserved joint sealing material according to claim 1, characterized in that The inner cavity of the box body (3) is communicated with a pipeline (6) with a valve.

5. The compressive and impermeable performance test device for a structural reserved joint sealing material according to claim 1, characterized in that, An intelligent water pressure monitor (7) is arranged on the box body (3).

6. The compressive and impermeable performance test device for the structure reserved joint sealing material according to claim 1, characterized in that, A groove (8) for plugging into the side wall of the box body (3) is formed on the concrete specimen (1). The groove (8) covers the test cavity (2).

7. An experimental device for testing the compressive and impermeable properties of a sealing material for structural reserved joints according to claim 6, characterized in that, A connecting piece is arranged between the groove (8) and the side wall of the box body (3).

8. An experimental device for testing the compressive and impermeable properties of a sealing material for structural reserved joints according to claim 1, characterized in that It further includes a slide rail. A pair of support platforms are slidably matched on the slide rail. A height adjusting device is arranged on the support platform and is used to abut against the bottom of the concrete specimen (1).

9. A test method for the compressive and impermeability properties of a structural reserved joint sealing material, based on the test device for the compressive and impermeability properties of a structural reserved joint sealing material according to any one of claims 1-8, characterized in that, Including the following steps: Connect the box body (3) to the concrete specimen (1). Inject the pressurized liquid into the test cavity (2). Pressurize the pressurized liquid through the loading mechanism.

10. The test method for the compressive and impermeable properties of a structural reserved joint sealing material according to claim 9, characterized in that, When pressurizing the pressurized liquid through the loading mechanism, the gradient pressurization method or the pressure holding method or a set pressurization frequency is adopted.

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