Buoyancy testing device

Abstract

The utility model belongs to the technical field of shield tunneling, and discloses a buoyancy testing device which comprises a containing box and a testing assembly, and the containing box is used for containing synchronous slurry; the testing assembly comprises a testing piece and a first tension measuring device, the testing piece is soaked in the synchronous slurry and connected with the measuring end of the first tension measuring device, and the first tension measuring device is connected with the containing box. The first tension measuring device is used for measuring the buoyancy borne by the test piece, testing of the synchronous slurry buoyancy borne by the test piece is achieved, the first tension measuring device is fixed relative to the containing box by connecting the first tension measuring device with the containing box, and the measured value of the synchronous slurry buoyancy borne by the test piece is more accurate. By soaking the test piece in the synchronous slurry, the practical process of simulation engineering is realized, so that the stress change condition of the test piece after the synchronous slurry is grouted can be conveniently tested.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shield technology field especially relates to a buoyancy testing device. BACKGROUND

[0002] In the construction method of the subway tunnel, the shield method has become the preferred method for the construction of the subway tunnel due to the high construction safety, the small influence on the surrounding environment and the fast tunneling speed. In the process of tunneling by the shield machine, the segments are disconnected from the shield tail of the shield machine, are connected in a ring to form a segment ring, and the segment ring is connected longitudinally (in the tunneling direction) to form a tunnel lining structure. Since the outer diameter of the segment is smaller than the diameter of the cutter head of the shield machine (the outer diameter of the shield shell), after the segment is disconnected from the shield tail, there is an annular gap between the outer side of the segment (the outer periphery of the segment ring) and the stratum. If the annular gap cannot be filled in time and effectively, the soil above and the segment itself will sink and deform without support, resulting in over-limit settlement and damage to the tunnel structure. Therefore, it is necessary to continuously grout from the shield tail backward during the advancement of the shield machine to fill the shield gap. The advancement and grouting are performed simultaneously, and the advancement speed of the shield machine is matched with the grouting speed. One ring is completed with grouting at the same time (the shield gap actually does not appear), so it is called synchronous grouting.

[0003] At present, the synchronous grouting slurry for the subway shield tunnel is single slurry and double slurry. The physical gelation (complete solidification into a consolidated body) time of the single slurry is generally about 8-10 hours, and the physical gelation time of the double slurry is more than two hours. For small-diameter subway shield segments, it only takes about one hour to disconnect from the shield tail, and for large-diameter shield segments, it takes a little longer. However, the synchronous grouting material filled in the outer periphery of the segment disconnected from the shield tail has not completed physical gelation (especially the single slurry material is far from completion). In addition, the density of the grouting material is greater than the density of the segment, and the buoyancy received by the segment disconnected from the shield tail is greater than the weight of the segment, so the segment disconnected from the shield tail may float upward, and the grouting material may sink.

[0004] The floating phenomenon of the segment disconnected from the shield shell in the synchronous grouting slurry not only causes the tunnel to deviate from the designed route, but also causes local damage to the segment and joint leakage and other problems. In severe cases, it may even cause segment misalignment, cracking and water leakage, thereby reducing the safety and serviceability of the tunnel structure and greatly affecting the engineering quality of the shield tunnel. Therefore, how to test the buoyancy of the segment is a problem that is concerned and researched in the shield construction. The setting time and strength development speed of the synchronous slurry are different, so the grouting body gradually loses fluidity and forms a structure, and the stress condition of the segment wrapped by the grouting body changes complexly during the strength growth process. This process is affected by the activity and reaction process of the slurry itself, and a relatively simple and direct experimental device that can be relatively matched with engineering practice is needed to quickly and conveniently test the stress change condition of the segment wrapped by the synchronous slurry after grouting.

[0005] Therefore, it is urgent to provide a buoyancy testing device to solve the above problems. Content of the utility model

[0006] The utility model discloses a buoyancy testing device, can test the change situation of the pipe piece force that it is wrapped after synchronous slurry injection.

[0007] To achieve this purpose, the utility model adopts the following technical scheme:

[0008] A kind of buoyancy testing device, comprising:

[0009] Accommodation box, the accommodation box is used to accommodate synchronous slurry;

[0010] Test component, the test component includes test piece and first tension measuring device, test piece is soaked in synchronous slurry, test piece is connected with the measuring end of first tension measuring device, and first tension measuring device is connected with accommodation box.

[0011] As preferred, test component further includes first connecting piece, and test piece is connected with the measuring end of first tension measuring device by first connecting piece.

[0012] As preferred, accommodation box includes box body and box cover, and box body and box cover are detachably buckled connection.

[0013] As preferred, first tension measuring device is detachably connected with box cover.

[0014] As preferred, test component further includes first nut and first fixed part, first nut is located on the side of box cover away from box body, first tension measuring device is detachably connected with one end of first fixed part, the other end of first fixed part is equipped with first outer thread, and the other end of first fixed part is threaded in box cover and is threadedly connected with first nut.

[0015] As preferred, irrigation hole is formed on box cover and / or box body, and synchronous slurry can be injected into box body through irrigation hole.

[0016] As preferred, buoyancy testing device further includes contrast component, and contrast component includes second connecting piece and second tension measuring device, second connecting piece is connected with the measuring end of second tension measuring device, second tension measuring device is connected with accommodation box, first connecting piece and second connecting piece are configured to be at least partially soaked in synchronous slurry, and the volume of synchronous slurry that is kept away by second connecting piece is same with the volume of synchronous slurry that is kept away by first connecting piece.

[0017] As preferred, release agent layer is arranged on the inner wall of accommodation box, and release agent layer is configured to be located between the inner wall of accommodation box and synchronous slurry.

[0018] As a preference, the first tensile force measuring device is located above the liquid level of the synchronous slurry.

[0019] As a preference, the test piece can be entirely immersed in the synchronous slurry.

[0020] The present application has the following beneficial effects:

[0021] The present application provides a buoyancy testing device, comprising a containing box and a testing assembly, the containing box is used for containing synchronous slurry; the testing assembly comprises a test piece and a first tensile force measuring device, the test piece is immersed in the synchronous slurry, the test piece is connected with the measuring end of the first tensile force measuring device, and the first tensile force measuring device is connected with the containing box. The first tensile force measuring device is used for measuring the buoyancy received by the test piece, realizes the test of the buoyancy of the test piece received by the synchronous slurry, the first tensile force measuring device is connected with the containing box, the fixation of the first tensile force measuring device relative to the containing box is realized, and the measurement value of the buoyancy of the test piece received by the synchronous slurry is more accurate. The test piece is immersed in the synchronous slurry, the practical process of simulation engineering is realized, and therefore the stress change condition of the test piece after synchronous slurry grouting can be conveniently tested. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The present application provides a buoyancy testing device structure schematic view.

[0023] In the drawings:

[0024] 1, synchronous slurry; 10, containing box; 11, box body; 12, box cover; 13, irrigation hole; 20, testing assembly; 21, test piece; 22, first tensile force measuring device; 23, first connecting piece; 24, first fixing piece; 30, contrast assembly; 31, second connecting piece; 32, second tensile force measuring device; 33, second fixing piece; 40, controller. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings rather than all the structures.

[0026] In the description of the utility model, unless another definite provision and limitation, the term "link", "connection", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two element internal communication or two element mutual action relation.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0027] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the direct contact of the first and second features, also can include the contact of the first and second features not direct contact but through the contact between other features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0028] In the description of the embodiment, the orientation or position relationship of the terms "on", "under", "right", etc.is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0029] The embodiment provides a buoyancy testing device, which can quickly and conveniently test the stress change of the pipe piece wrapped by synchronous slurry injection.

[0030] Specifically, as Figure 1As shown, a buoyancy testing device includes a containing box 10 and a testing assembly 20, the containing box 10 is used for containing synchronous slurry 1; the testing assembly 20 includes a testing piece 21 and a first tension measuring device 22, the testing piece 21 is soaked in the synchronous slurry 1, the testing piece 21 is connected with a measuring end of the first tension measuring device 22, and the first tension measuring device 22 is connected with the containing box 10. The first tension measuring device 22 is used for measuring the buoyancy of the testing piece 21, realizing the testing of the buoyancy of the testing piece 21 by the synchronous slurry 1, and realizing the fixation of the first tension measuring device 22 relative to the containing box 10 by connecting the first tension measuring device 22 with the containing box 10, so that the measured value of the buoyancy of the testing piece 21 by the synchronous slurry 1 is more accurate. By soaking the testing piece 21 in the synchronous slurry 1, the practical process of simulation engineering is realized, so that the stress change of the testing piece 21 after the synchronous slurry 1 is injected can be conveniently tested. It should be noted that the size, shape and inner diameter of the testing piece 21 and the containing box 10 can be customized according to the pipe segment to be simulated for testing, and the corresponding process is mature and the cost is low, which can meet the needs of simple testing of different synchronous slurry 1 in different engineering.

[0031] In the embodiment, the first tension measuring device 22 is a tension and pressure sensor, and in other embodiments, the first tension measuring device 22 can also be a tension and pressure measuring instrument. In the embodiment, the testing piece 21 is a plastic round float, and in other embodiments, the testing piece 21 can be a hollow cuboid structure or a solid structure made of other light materials. In the embodiment, the containing box 10 is a plastic box, and in other embodiments, the containing box 10 can be an iron box. The plastic round float and the plastic box are low in cost, meeting the testing needs of long testing time or fast growth of slurry strength.

[0032] Further, the testing assembly 20 further includes a first connecting piece 23, the testing piece 21 is connected with the measuring end of the first tension measuring device 22 through the first connecting piece 23, realizing the connection of the testing piece 21 with the first tension measuring device 22.

[0033] Further, the testing piece 21 is provided with a jack (not shown in the figure), and the first connecting piece 23 is sealingly inserted into the jack, so as to realize the sealing of the testing piece 21 with the first connecting piece 23, avoiding the synchronous slurry 1 flowing into the jack and causing inaccurate test results. In other embodiments, the testing piece 21 is provided with a first magnetic attraction piece, the first connecting piece 23 is provided with a second magnetic attraction piece, the first magnetic attraction piece and the second magnetic attraction piece are magnetically attracted and fixed, or the first connecting piece 23 and the testing piece 21 are fixed by pasting.

[0034] Optionally, the containing box 10 comprises a box body 11 and a box cover 12, the box body 11 is detachably fastened with the box cover 12, facilitating the simultaneous pulp to be discharged after the pulp liquid 1 is coagulated, and facilitating the simultaneous pulp liquid 1 to be quickly injected into the box body 11 before the test. In other embodiments, the box cover 12 and the box body 11 can also be detachably clamped by a clamping structure.

[0035] Further, the first tension measuring device 22 is detachably connected with the box cover 12, facilitating the recycling of the first tension measuring device 22 and improving the utilization rate of the first tension measuring device 22.

[0036] Further, the test assembly 20 further comprises a first nut (not shown in the figure) and a first fixing member 24, the first nut is located on the side of the box cover 12 away from the box body 11, the first tension measuring device 22 is detachably connected with one end of the first fixing member 24, the other end of the first fixing member 24 is provided with a first external thread, the other end of the first fixing member 24 is penetrated through the box cover 12 and is threadedly connected with the first nut, realizing the detachable connection of the first tension measuring device 22 with the box cover 12, and also avoiding the movement of the first tension measuring device 22 itself to cause the inaccuracy of the measurement result of the buoyancy of the test piece 21 to the simultaneous pulp liquid 1. In other embodiments, the first fixing member 24 can be fixedly connected with the box cover 12 by pasting.

[0037] Further, the box cover 12 is provided with an irrigation hole 13, the simultaneous pulp liquid 1 can be injected into the box body 11 through the irrigation hole 13, realizing the injection of the simultaneous pulp liquid 1. In other embodiments, the irrigation hole 13 is provided on the end of the box body 11 close to the box cover 12, or the irrigation hole 13 is provided on the box cover 12 and the end of the box body 11 close to the box cover 12.

[0038] Optionally, the buoyancy test device further comprises a control assembly 30, the control assembly 30 comprises a second connecting member 31 and a second tension measuring device 32, the second connecting member 31 is connected with the measuring end of the second tension measuring device 32, the second tension measuring device 32 is connected with the containing box 10, the first connecting member 23 and the second connecting member 31 are both configured to be at least partially soaked in the simultaneous pulp liquid 1, and the volume of the simultaneous pulp liquid 1 displaced by the second connecting member 31 is the same as the volume of the simultaneous pulp liquid 1 displaced by the first connecting member 23, the second tension measuring device is used for measuring the buoyancy of the second connecting member 31, the control assembly 30 is provided in strict accordance with the test assembly 20 except for the test piece 21, and then the buoyancy of the second connecting member 31 is equal to the buoyancy of the first connecting member 23, so as to exclude the influence of the buoyancy of the first connecting member 23 in the simultaneous pulp liquid 1, and make the test result of the buoyancy of the test piece 21 to the simultaneous pulp liquid 1 more reliable. In this embodiment, the second tension measuring device 32 is a tension and pressure sensor, and in other embodiments, the second tension measuring device 32 can also be a tension and pressure measuring instrument.

[0039] Further, the test assembly 20 further comprises a second nut (not shown in the figure) and a second fixing member 33, the second nut is located on the side of the box cover 12 away from the box body 11, the second tension measuring device 32 is detachably connected to one end of the second fixing member 33, the other end of the second fixing member 33 is provided with a second external thread, the other end of the second fixing member 33 is threaded through the box cover 12 and is threadedly connected with the second nut, thereby realizing the detachable connection of the second tension measuring device 32 with the box cover 12, avoiding the inaccuracy of the measurement result of the second connecting member 31 caused by the movement of the second tension measuring device 32 itself under the synchronous slurry 1, and further ensuring that the only variable of the control assembly 30 and the test assembly 20 is the test piece 21. In other embodiments, the second fixing member 33 can be fixedly connected with the box cover 12 by adhesion.

[0040] Optionally, a release agent layer is arranged on the inner wall of the containing box 10, and the release agent layer is configured to be located between the inner wall of the containing box 10 and the synchronous slurry 1, so as to facilitate the separation of the synchronous slurry 1 after solidification from the containing box 10. In this embodiment, the release agent layer is an edible oil layer, and in other embodiments, the release agent layer is an engine oil layer.

[0041] Optionally, the first tension measuring device 22 is located above the liquid level of the synchronous slurry 1, which can avoid the inaccuracy of the buoyancy test value caused by the influence of the buoyancy of the synchronous slurry 1 on the first tension measuring device 22, and prevent the synchronous slurry 1 from soaking the first tension measuring device 22, so that the first tension measuring device 22 is solidified together during the solidification of the synchronous slurry 1, thereby avoiding the damage to the first tension measuring device 22 when the first fixing member 24 is recovered, and further realizing the nondestructive recovery of the first tension measuring device 22.

[0042] Optionally, the test piece 21 can be entirely soaked in the synchronous slurry 1, thereby further improving the accuracy of the force change of the test piece 21 wrapped by the synchronous slurry 1 after grouting.

[0043] Optionally, the buoyancy test device further comprises a controller 40, the first tension measuring device 22 and the second tension measuring device 32 are signal-connected with the controller 40, and the controller 40 collects and processes the data of the first tension measuring device 22 and the second tension measuring device 32, so that the observation of the buoyancy value is more intuitive. In this embodiment, the controller 40 is a data processing memory, and in other embodiments, the controller 40 can be a data processing system.

[0044] The buoyancy test device provided in this embodiment has the following specific operation steps:

[0045] S1, connect the device to the controller 40, open the test software, and clear the initial value;

[0046] S2, preparation of the to-be-tested synchronous slurry 1, a release agent layer is formed by smearing a release agent on the inner wall of the containing box 10; after the automatic recording data is opened, the to-be-tested synchronous slurry 1 is poured into the containing box 10;

[0047] S3, the controller 40 automatically collects and saves data until the test is completed;

[0048] S4, the first tensile force measuring device 22 is disassembled from top to bottom through the first external thread on the first fixing piece 24, the second tensile force measuring device 32 is disassembled from top to bottom through the second external thread on the second fixing piece 33, and the solidified synchronous slurry 1 is poured out;

[0049] S5, the collected data is processed.

[0050] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A buoyancy testing apparatus, characterized by, include: A container (10) is used to contain synchronous slurry (1); The test assembly (20) includes a test piece (21) and a first tensile measuring device (22). The test piece (21) is immersed in the synchronous slurry (1). The test piece (21) is connected to the measuring end of the first tensile measuring device (22). The first tensile measuring device (22) is connected to the container (10).

2. The buoyancy test apparatus of claim 1, wherein, The test component (20) further includes a first connector (23), and the test component (21) is connected to the measuring end of the first tensile measuring device (22) through the first connector (23).

3. The buoyancy test apparatus of claim 2, wherein, The container (10) includes a container body (11) and a container cover (12), and the container body (11) and the container cover (12) are detachably fastened together.

4. The buoyancy test apparatus of claim 3, wherein, The first tensile force measuring device (22) is detachably connected to the box cover (12).

5. The buoyancy test apparatus of claim 4, wherein, The test assembly (20) further includes a first nut and a first fastener (24). The first nut is located on the side of the cover (12) away from the box body (11). The first tensile measuring device (22) is detachably connected to one end of the first fastener (24). The other end of the first fastener (24) is provided with a first external thread. The other end of the first fastener (24) passes through the cover (12) and is threadedly connected to the first nut.

6. The buoyancy test apparatus of claim 5, wherein, An irrigation hole (13) is provided on the cover (12) and / or the body (11), through which the synchronous slurry (1) can be injected into the body (11).

7. The buoyancy test apparatus according to any one of claims 2-6, wherein, The buoyancy testing device further includes a control component (30), which includes a second connector (31) and a second tensile measuring device (32). The second connector (31) is connected to the measuring end of the second tensile measuring device (32), and the second tensile measuring device (32) is connected to the container (10). The first connector (23) and the second connector (31) are both configured to be at least partially immersed in the synchronous slurry (1), and the volume of the synchronous slurry (1) displaced by the second connector (31) is the same as the volume of the synchronous slurry (1) displaced by the first connector (23).

8. The buoyancy test apparatus according to any one of claims 1 to 6, wherein The inner wall of the container (10) is provided with a release agent layer, which is configured to be located between the inner wall of the container (10) and the synchronous slurry (1).

9. The buoyancy test apparatus according to any one of claims 1 to 6, wherein The first tension measuring device (22) is located above the surface of the synchronous slurry (1).

10. The buoyancy test apparatus of any one of claims 1-6, wherein, The test piece (21) can be completely immersed in the synchronous slurry (1).

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