Simulation detection device for floating and floating amount of shield tunnel segment

Abstract

The utility model discloses a shield tunnel segment floating and floating quantity simulation detection device, which belongs to the technical field of shield tunnel grouting material performance test equipment, and comprises a slurry storage container used for accommodating simulation slurry, and a segment bracket is arranged in a container cavity; the segment simulation part is arranged above the slurry storage container in a manner of being capable of freely ascending and descending up and down in the vertical direction, and the lowest descending end is arranged on the segment bracket; and the displacement collector is configured right above the duct piece simulation piece and is used for detecting the floating amount of the duct piece simulation piece in the slurry storage container in the floating process. The device provided by the utility model can be used for simulating the floating process and the floating quantity of the shield tunnel segment under the buoyancy action of the grouting material under the laboratory condition.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield tunnel grouting material performance testing equipment, and particularly relates to a simulation detection device for shield tunnel segment floating and floating amount. Background Technique

[0002] The shield method is widely used in the construction fields of urban subways, river-crossing tunnels and other underground spaces, and the diameter of shield tunnels shows an increasing development trend. According to the construction principle of the shield method and the stress state of the formed segments, the buoyancy force on the formed segments of the shield tunnel increases as a quadratic power function with the segment diameter, and the increase in buoyancy force is much greater than the anti-buoyancy force of the segment structure self-weight. With the increase in the excavation diameter of the shield tunnel, the problem of segment floating becomes more prominent. The buoyancy force on the segments after they are assembled and out of the shield tail will increase exponentially. Serious segment floating may lead to segment cracking, threatening the shield attitude control and increasing the shield attitude deviation, resulting in difficult segment assembly, misalignment or even damage, seriously affecting the tunnel waterproof effect and the safety of later operation. The synchronous grouting material for shield tunnels can play a role in controlling segment floating, reducing ground settlement, transferring loads and constructing the first waterproof and anti-seepage barrier.

[0003] During the construction process of shield tunnels, the parameters such as the performance of grouting materials, grouting pressure, grouting volume and tunneling rate are often adjusted by real-time monitoring of the floating amount of segments. The regulation of grouting material performance is crucial for realizing segment floating control. There are certain technical risks, time-consuming and laborious in regulating the performance of grouting materials through the actual measurement feedback of the floating amount of engineering segments, increasing the construction operation cost. Simulating the floating process of shield tunnel segments and evaluating the performance differences of grouting materials under laboratory conditions for segment floating control effect is simple in operation and low in cost, and can provide sufficient technical accumulation and support for on-site operations. In addition, the shield segments are also subject to the binding force of the shield shell while being affected by the floating force of the slurry, and the binding force of the shield shell on the segments changes continuously as the shield machine advances forward. Therefore, under laboratory simulation conditions, it is also necessary to consider the floating process of segments under dynamic binding force and the change law of the floating amount. Therefore, it is necessary to propose a test device suitable for simulating shield tunnel segment floating and floating amount detection. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a simulation detection device for shield tunnel segment floating and floating amount, which can be used to simulate the floating process and detect the floating amount of shield tunnel segments under laboratory conditions when they are affected by the buoyancy force of grouting materials.

[0005] To achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0006] The utility model provides a simulation detection device for shield tunnel segment floating and floating amount, including:

[0007] A slurry storage container for containing simulated slurry, and a segment bracket is arranged in the container cavity;

[0008] A segment simulation member is configured above the slurry storage container to be able to freely move up and down in the vertical direction, and the lowest end of the descent is placed on the segment bracket;

[0009] A displacement collector is configured directly above the segment simulation member for detecting the floating amount during the floating process of the segment simulation member in the slurry storage container.

[0010] Furthermore, the segment simulation member includes a hollow segment in the shape of a cylinder, a transmission rod, a linear bearing, and a counterweight platform;

[0011] The linear bearing is fixedly arranged on an external support frame in the vertical direction, the transmission rod is vertically and freely slidably inserted into the linear bearing, the lower end of the transmission rod is fixedly connected to the hollow segment, the upper end of the transmission rod is fixedly connected to the counterweight platform, and at least one counterweight is arranged on the counterweight platform.

[0012] Furthermore, the counterweight platform is a circular storage container or a tray, and the counterweights are steel balls or square iron blocks.

[0013] Furthermore, the displacement collector is fixedly arranged on the external support frame and is located directly above the counterweight platform.

[0014] Furthermore, the displacement collector uses a laser displacement sensor.

[0015] Furthermore, the top of the segment bracket is configured as a semi-circular groove with an upward opening that matches the cylindrical shape of the hollow segment.

[0016] Compared with the prior art, the beneficial effects achieved by the present utility model:

[0017] The simulation detection device for the floating and floating amount of shield tunnel segments provided by the present utility model simulates the floating process of segments and the change law of the floating amount under laboratory conditions. The simulation detection device is easy to operate, can more clearly and accurately reflect the difference in slurry performance, is easy to operate, and has low cost; and can simulate the change law of the floating amount under the action of dynamic binding force during the floating of segments by adjusting the counterweights on the counterweight platform.

[0018] In addition, the simulation detection device can also be used to provide sufficient technical accumulation and support for on-site operations. For example, it helps to study and evaluate the influence law of the performance parameters of grouting materials on the anti-floating effect of segments, and can provide technical reference and guidance for the determination of the key technical indicators of grouting materials and the selection of grouting materials in actual engineering applications. Description of the Drawings

[0019] Figure 1 This is a schematic structural diagram of a simulation detection device for the floating and floating amount of segment lining in a shield tunnel provided by an embodiment of the present utility model;

[0020] Figure 2 This is a side view of a simulation detection device for the floating and floating amount of segment lining in a shield tunnel provided by an embodiment of the present utility model;

[0021] In the figure:

[0022] 1. Bottom plate; 2. Support frame; 3. Slurry storage container; 4. Segment bracket; 5. Hollow segment; 6. Transmission rod; 7. Counterweight platform; 8. Counterweight; 9. Linear bearing; 10. Displacement collector. Specific implementation manner

[0023] The present utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0024] Embodiment

[0025] As Figure 1 and Figure 2 shown, an embodiment of the present utility model provides a simulation detection device for the floating and floating amount of segment lining in a shield tunnel. The device includes a slurry storage container 3, a segment simulation member, and a displacement collector 10.

[0026] Among them, the slurry storage container 3 is used to hold the simulated slurry and can be a round barrel, a square barrel, etc. A segment bracket 4 is provided at the bottom of the cavity of the slurry storage container 3. The top of the segment bracket 4 is configured as a semi-circular groove that matches the cylindrical shape of the hollow segment 5 of the segment simulation member and opens upward, for supporting the hollow segment 5 of the segment simulation member when the segment simulation member descends to the lowest position.

[0027] The segment simulation member is configured to be able to freely move up and down in the vertical direction above the slurry storage container 3 and is placed in the semi-circular groove of the segment bracket 4 when it descends to the lowest position.

[0028] Among them, the segment simulation member includes a hollow segment 5 in the shape of a cylinder, a transmission rod 6, a linear bearing 9, and a counterweight platform 7.

[0029] The linear bearing 9 is fixedly arranged in the vertical direction on the external support frame 2. The transmission rod 6 is vertically and freely slidably inserted through the linear bearing 9. The lower end of the transmission rod 6 is fixedly connected to the hollow segment 5, and the upper end of the transmission rod 6 is fixedly connected to the counterweight platform 7. At least one counterweight 8 is arranged on the counterweight platform 7.

[0030] The counterweight platform 7 is a circular storage container or tray. The counterweight 8 is a steel ball or a square iron block. The counterweight platform 7 is made of a lightweight material to reduce its own weight. The used hollow segment 5 is made of a hollow cylindrical metal. When used in combination with the counterweight platform 7, the counterweight 8 can be added or reduced as needed to adjust the weight, thereby simulating the process of the dynamic constraint force of the segment changing with time during the grouting process.

[0031] In addition, there are rolling steel balls inside the linear bearing 9. When the transmission rod 6 passes through the linear bearing 9, it can slide up and down freely with extremely small friction.

[0032] The displacement collector 10 is arranged directly above the segment simulation piece and is used to detect the floating amount of the segment simulation piece during the floating process in the slurry storage container 3.

[0033] The displacement collector 10 is fixedly arranged on the external support frame 2 and is located directly above the counterweight platform. In this embodiment, the support frame 2 has an F-shaped structure. Among them, the linear bearing 9 is located at the free end of the middle crossbar of the support frame 2, and the displacement collector 10 is located at the free end of the upper crossbar of the support frame 2.

[0034] The displacement collector 10 uses a laser displacement sensor. The measuring range of the displacement sensor is ±10 mm. During the floating process of the segment, the laser displacement sensor characterizes the floating amount of the segment by collecting the movement of the upper end of the transmission rod 6.

[0035] The above device can simulate the floating process of the shield tunnel segment and complete the detection of its floating amount. In order to obtain more stable and reliable test results, the environmental temperature and humidity should be kept constant during the entire test process.

[0036] In this embodiment, the operation simulation method of the simulation detection device for the floating and floating amount of the shield tunnel segment provided by the embodiment of the present utility model is described as follows.

[0037] First, install and debug the above simulation detection device. Initially, there is no grouting material in the slurry storage container 3. The hollow segment 5 is placed on the segment bracket 4. Determine the mass of the counterweight 8 according to the designed constraint force, and weigh steel balls of equal mass and place them on the counterweight platform 7;

[0038] Secondly, after the above work is completed, inject the synchronous grouting material slurry so that the slurry completely submerges the hollow segment 5. At this time, the hollow segment 5 and the connecting parts of the transmission rod 6 start to be affected by the buoyancy of the slurry. The transmission rod 6 displaces upward under the limiting action of the linear bearing 9, and the displacement change of the segment simulation piece is collected by the displacement sensor.

[0039] In addition, the floating process of the segment simulation under the action of dynamic binding force is mainly achieved by increasing or decreasing the mass of the counterweight 8. In actual engineering, the upward buoyancy varies according to the diameter of the segment and is about 2 to 3 times the self-weight of the segment. Therefore, the initial buoyancy of the hollow segment 5 can be estimated based on the slurry density and the external dimensions of the hollow segment 5, and by controlling the counterweight of the simulated hollow segment 5, the initial upward buoyancy can be controlled to be about 2 times the self-weight of the segment. During the floating process of the hollow segment 5 under the action of buoyancy after the slurry is injected into the slurry storage device, the weight of the steel balls on the counterweight platform 7 is gradually reduced to reduce the binding force on the hollow segment 5, so as to simulate the floating process of the segment in slurries with different properties under the action of dynamic binding force, and the floating amount of the simulated segment can be detected in real time.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It 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 to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0042] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A device for simulating and detecting the floating of shield tunnel segments and the floating amount, characterized in that: include: The slurry storage container is used to contain the simulated slurry, and a tube segment bracket is arranged in the container cavity; The segment simulation part is arranged above the slurry storage container so as to be able to freely rise and fall in the vertical direction, and the lowest end thereof is disposed on the segment bracket; The displacement collector is arranged just above the segment simulation component and is used to detect the floating amount of the segment simulation component during the floating process in the slurry storage container.

2. The device for simulating and detecting the floating of shield tunnel segments and the floating amount according to claim 1, characterized in that: The segment simulation part includes a cylindrical hollow segment, a transmission rod, a linear bearing and a counterweight platform; The linear bearing is fixedly arranged on the external support frame in a vertical position, and the transmission rod is freely slidable up and down in the vertical direction and penetrates the linear bearing. The lower end of the transmission rod is fixedly connected to the hollow pipe segment, and the upper end of the transmission rod is fixedly connected to the counterweight platform, and at least one counterweight is arranged on the counterweight platform.

3. The device for simulating and detecting the floating of shield tunnel segments and the floating amount according to claim 2, characterized in that: The counterweight platform is a round container or a tray, and the counterweight is a steel ball or a square iron block.

4. The device for simulating and detecting the floating of shield tunnel segments and the floating amount according to claim 2, characterized in that: The displacement collector is fixedly arranged on the external support frame and is located directly above the counterweight platform.

5. The device for simulating and detecting the floating of shield tunnel segments and the floating amount according to claim 4, characterized in that: The displacement collector adopts a laser displacement sensor.

6. The device for simulating and detecting the floating of shield tunnel segments and the floating amount according to claim 2, characterized in that: The top of the segment bracket is configured as an upwardly open semicircular groove matching the cylindrical shape of the hollow segment.

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