Displacement sensor with embedded body and assembly method thereof

Abstract

The present invention relates to a displacement sensor with an embedded body and an assembly method thereof, belonging to the technical field of tunnel displacement sensors. It comprises an embedded body and a displacement sensor, wherein the embedded body comprises an adjustable embedded tube, a base plate and a cover plate, wherein the base plate is detachably connected to the end of the adjustable embedded tube, and the cover plate is detachably connected to the front end of the adjustable embedded tube; one end of the displacement sensor is a fixed end and the other end is a movable end, wherein the fixed end of the displacement sensor passes through the adjustable embedded tube and is fixedly connected to the base plate through a connector, wherein a displacement hole and a lead hole are provided on the cover plate, wherein the movable end of the displacement sensor passes through the displacement hole, and the lead of the displacement sensor is led out through the lead hole. The present application is not only simple in structure and convenient in assembly, which greatly reduces the construction time, but also has an adjustable length of the embedded tube, and the adjustable embedded tube has strong versatility, which reduces the production cost.

Description

Technical Field

[0001] The invention relates to a displacement sensor with an embedded body and an assembling method thereof, belonging to the technical field of tunnel displacement sensors. Background Art

[0002] The safety of tunnel structures is always a very important issue in engineering construction, operation and maintenance due to the complex surrounding rock and geological and hydrological conditions. There is a consensus in the engineering community at home and abroad that any major project has the risk of accidents or even crashes. So how to find problems as early as possible before an accident occurs and take necessary measures to reduce the occurrence of accidents and losses has become the primary issue that the engineering community needs to consider and solve.

[0003] During the tunnel construction process, the initial support of the tunnel is the key to ensuring construction safety. It can give full play to the bearing capacity of the surrounding rock itself, quickly seal the surrounding rock, and prevent the surrounding rock from collapsing due to weathering and hydration caused by long-term exposure to water, air, etc.; the secondary lining is the cast concrete or reinforced concrete lining applied on the inner side of the initial support during tunnel construction. The secondary lining and the initial support together form the initial support of the composite lining tunnel, which bears the load. In order to ensure the firmness of the connection between the secondary lining and the interior of the tunnel, displacement sensors are set inside the secondary lining and the tunnel to detect whether there is a gap between the secondary lining and the interior of the tunnel. However, at present, when the displacement sensor penetrates into the secondary lining and the inner wall of the tunnel, the drilling time is long, which increases the construction time. For pre-buried holes of different depths, pre-buried pipes of different lengths are also required, and the pre-buried pipes have poor versatility. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a displacement sensor with an embedded body and an assembly method thereof in view of the above-mentioned prior art, which not only has a simple structure, convenient installation, and reduces construction time; but also has strong versatility of the embedded body.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a displacement sensor with an embedded body, comprising an embedded body and a displacement sensor, the embedded body comprising an adjustable embedded tube, a base plate and a cover plate, the base plate is detachably connected to the end of the adjustable embedded tube, and the cover plate is detachably connected to the front end of the adjustable embedded tube; one end of the displacement sensor is a fixed end and the other end is a movable end, the fixed end of the displacement sensor passes through the adjustable embedded tube and is fixedly connected to the base plate through a connecting piece, a displacement hole and a lead hole are provided on the cover plate, the movable end of the displacement sensor passes through the displacement hole, and the lead of the displacement sensor is led out through the lead hole.

[0006] One end of the connecting piece is threadedly connected to a mounting hole provided at the end of the fixed end of the displacement sensor, and the other end is threadedly connected to a mounting hole provided on the bottom plate.

[0007] The adjustable embedded pipe includes a first connecting pipe and a second connecting pipe, the first connecting pipe is provided with a first external thread along the axial direction, the second connecting pipe is provided with a second internal thread along the axis line, the first connecting pipe and the second connecting pipe are threadedly connected through the second internal thread and the first external thread, and the splicing length of the first connecting pipe and the second connecting pipe is adjusted by changing the threaded connection length of the first connecting pipe and the second connecting pipe.

[0008] The cover plate is provided with a second external thread, and the cover plate is threadedly connected to the second connecting pipe.

[0009] The displacement hole is a tapered hole, the diameter of the hole at the inlet end is smaller than the diameter of the hole at the outlet end, and the movable end of the displacement sensor passes through the inlet end and the outlet end in sequence.

[0010] A sealing ring is arranged in the displacement hole.

[0011] The movable end of the displacement sensor has a large diameter section and a small diameter section. The small diameter section is arranged at the front end of the large diameter section. The two can be relatively displaced and extended. The large diameter section is partially exposed from the cover plate. A resistance piece is arranged at the end of the small diameter section.

[0012] An assembly method of a displacement sensor with an embedded body, the assembly method comprising the following steps:

[0013] Step 1: Thread the connector to the base plate, and assemble the first connecting pipe and the second connecting pipe to form an adjustable embedded pipe of a preset length;

[0014] Step 2: Thread the adjustable embedded pipe to the bottom plate, insert the displacement sensor into the adjustable embedded pipe, align the mounting hole at the fixed end of the displacement sensor with the connector, and thread the displacement sensor to the connector;

[0015] Step 3: Align the displacement hole on the cover plate with the movable end of the displacement sensor, let the movable end of the displacement sensor pass through the cover plate, let the lead wire of the displacement sensor pass through the lead wire hole on the cover plate, and then connect the cover plate to the front end of the second connecting tube;

[0016] Step 4: Place the sealing ring in the displacement hole of the cover plate to seal the displacement hole;

[0017] Step 5: Install the resistance piece to the end of the movable end of the displacement sensor.

[0018] Another object of the present invention is to improve a method for installing a displacement sensor for a tunnel, which is to install the displacement sensor to the inner wall of the tunnel through an embedded body, one end of the displacement sensor is a fixed end, and the other end is a movable end, the fixed end of the displacement sensor passes through an adjustable embedded pipe and is fixedly connected to the bottom plate through a connector, and a displacement hole and a lead hole are provided on the cover plate; the embedded body includes an adjustable embedded pipe, a bottom plate and a cover plate, the bottom plate is detachably connected to the end of the adjustable embedded pipe, and the cover plate is detachably connected to the front end of the adjustable embedded pipe; the installation method mainly includes the following steps:

[0019] Step 1: spray cement on the inner wall of the tunnel to form a cement spray layer;

[0020] Step 2: drilling holes in the cement spray coating and extending the holes to the inside of the tunnel rock layer to form pre-buried holes;

[0021] Step 3: Thread the connector onto the base plate, and place the base plate with the connector into the pre-buried hole.

[0022] Step 4: Place the adjustable embedded pipe in the embedded hole, and connect and fix the adjustable embedded pipe to the base plate;

[0023] Step 5: Open a mounting hole at the end of the displacement sensor, put the displacement sensor into the adjustable embedded pipe, connect and fix the displacement sensor to the base plate through the mounting hole and the connector at the end, and let the front end of the displacement sensor protrude from the adjustable embedded pipe to outside the cement spray layer;

[0024] Step 6: Install the cover plate on the pipe opening of the adjustable embedded pipe, and let the front end of the displacement sensor, i.e., the movable end, pass through the displacement hole of the cover plate, and let the lead wire of the displacement sensor pass through the lead wire hole of the cover plate;

[0025] Step 7: Fix the cover plate to the cement spray coating;

[0026] Step 8. Lay a steel frame on the outside of the cement spray layer. When laying the steel frame, be careful to avoid contact with the active end of the displacement sensor. Then pour cement on the steel frame to form a reinforced concrete layer, and pour the active end of the displacement sensor into the reinforced concrete layer. At this time, the displacement sensor spans the gap between the cement spray layer and the reinforced concrete layer to sense changes in the size of the gap.

[0027] The cover plate is provided with a plurality of threaded fixing holes which are evenly spaced in an annular direction, and the threaded fixing holes are arranged outside the displacement holes and the lead holes, and the cover plate is fixed to the cement spray coating layer by the cooperation of the threaded fixing parts and the threaded fixing holes.

[0028] Compared with the prior art, the advantages of the present invention are: a displacement sensor with an embedded body and an assembly method thereof, wherein one end of an adjustable embedded pipe is threadedly connected to a connector on a base plate in advance, and the displacement sensor is arranged in the adjustable embedded pipe, and the connector on the base plate is inserted into the mounting hole of the displacement sensor, and the connector is threadedly connected to the mounting hole, so that the fixed end of the displacement sensor is fixed to the base plate. The large diameter section of the movable end of the displacement sensor partially exposes the adjustable embedded pipe and passes through the displacement hole of the cover plate. The present application is not only simple in structure and convenient to assemble, which greatly reduces the construction time, but also the length of the adjustable embedded pipe is adjustable, which makes the adjustable embedded pipe highly versatile and reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a displacement sensor with an embedded body according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the exploded embedded body;

[0031] Figure 3 for Figure 2 Schematic diagram of the middle cover;

[0032] In the figure, 1 is an embedded body, 1.1 is a base plate, 1.1.1 is a first internal thread, 1.2 is a connecting piece, 1.3 is a first connecting pipe, 1.3.1 is a first external thread, 1.4 is a second connecting pipe, 1.4.1 is a second internal thread, 1.5 is a cover plate, 1.5.1 is a second external thread, 1.5.2 is a displacement hole, 1.5.3 is a lead hole, 1.5.4 is a threaded fixing hole, 2 is a displacement sensor, 2.1 is a large diameter section, 2.2 is a small diameter section, 2.3 is a lead, 3 is a resistance piece, and 4 is a sealing ring. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 , 3As shown, a displacement sensor with an embedded body in this embodiment includes an embedded body 1 and a displacement sensor 2. The embedded body 1 includes an adjustable embedded tube, a base plate 1.1 and a cover plate 1.5. The base plate 1.1 is provided at one end of the adjustable embedded tube, and the two are fixed by threaded connection. One end of the displacement sensor 2 is a fixed end, and the other end is a movable end. The fixed end of the displacement sensor 2 passes through the adjustable embedded tube, and the movable end of the displacement sensor 2 is exposed from the adjustable embedded tube. The mounting hole in the center of the base plate 1.1 is threadedly connected to one end of the connector 1.2. The center of the fixed end of the displacement sensor 2 is provided with a mounting hole for the displacement sensor. The mounting hole of the displacement sensor is inserted into the connector 1.2, and the two are threadedly connected, so that the displacement sensor 2 is fixed to the base plate 1.1. The other end of the adjustable embedded tube is provided with a cover plate 1.5, and the two are fixed by threaded connection. The cover plate 1.5 is provided with a displacement hole 1.5.2 and a lead hole 1.5.3, through which the movable end of the displacement sensor 2 passes, so that the displacement sensor 2 is fixed in the adjustable embedded pipe, and the lead 2.3 of the displacement sensor 2 is led out through the lead hole 1.5.3.

[0036] like Figure 2 As shown, the adjustable embedded pipe includes a first connecting pipe 1.3 and a second connecting pipe 1.4, and the diameter of the first connecting pipe 1.3 is smaller than the diameter of the second connecting pipe 1.4. The outer peripheral wall of the first connecting pipe 1.3 is provided with a first external thread 1.3.1 along the axial direction, and the inner peripheral wall of the second connecting pipe 1.4 is provided with a second internal thread 1.4.1 along the axis. The first connecting pipe 1.3 is arranged in the second connecting pipe 1.4, and the first external thread 1.3.1 is threadedly screwed with the second internal thread 1.4.1. The splicing length of the first connecting pipe 1.3 and the second connecting pipe 1.4 is adjusted by the threaded screwing length. The adjustable embedded pipe is suitable for embedded holes of different depths, so that the adjustable embedded pipe has strong versatility.

[0037] The bottom plate 1.1 is provided with a first internal thread 1.1, and the bottom plate 1.1 is threadedly connected to the first connecting pipe 1.3. The cover plate 1.5 is provided with a second external thread 1.5.1, and the cover plate 1.5 is threadedly connected to the second connecting pipe 1.4. Three fixing thread holes 1.5.4 are circumferentially opened on the cover plate 1.5, and bolts are inserted into the fixing thread holes 1.5.4, so that the cover plate 1.5 is fixed to the inner wall of the tunnel.

[0038] like Figure 3 As shown, the orifice diameter of the inlet end of the displacement hole 1.5.2 is smaller than the orifice diameter of the outlet end of the displacement hole 1.5.2, so that the displacement hole 1.5.2 is a tapered hole.

[0039] A sealing ring 4 is arranged inside the displacement hole 1.5.2 to seal the displacement hole 1.5.2 and prevent debris from entering the inner cavity of the adjustable embedded pipe.

[0040] like Figure 1As shown, the movable end of the displacement sensor 1 has a large diameter section 2.1 and a small diameter section 2.2. The small diameter section 2.2 is arranged at the front end of the large diameter section 2.1. The two can be relatively displaced and extended, and the large diameter section 2.1 is partially exposed from the cover plate 1.5; a resistance member 3 is arranged at the end of the small diameter section 2.2. When pouring cement, the large diameter section 2.1 of the displacement sensor 2 and the resistance member 3 can be embedded in the reinforced concrete layer to avoid the lack of connection between the displacement sensor 2 and the reinforced concrete layer. When a gap is generated between the reinforced concrete layer and the sprayed layer, the displacement sensor 2 can detect the aforementioned.

[0041] Example 2

[0042] A method for assembling a displacement sensor with an embedded body, the structure of the displacement sensor is shown in Example 1, and the preferred assembly method includes the following steps:

[0043] Step 1: Thread the connector to the base plate, and assemble the first connecting pipe and the second connecting pipe to form an adjustable embedded pipe of a preset length.

[0044] Step 2: Thread the adjustable embedded pipe to the base plate, extend the displacement sensor into the adjustable embedded pipe, align the mounting hole at the fixed end of the displacement sensor with the connector, and thread the displacement sensor to the connector.

[0045] Step 3: Align the displacement hole on the cover with the movable end of the displacement sensor, let the movable end of the displacement sensor pass through the cover, let the lead of the displacement sensor pass through the lead hole on the cover, and then connect the cover to the front end of the second connecting tube.

[0046] Step 4: Place the sealing ring in the displacement hole of the cover plate to seal the displacement hole.

[0047] Step 5: Install the resistance piece to the end of the movable end of the displacement sensor.

[0048] The present application pre-threads one end of the adjustable embedded pipe with the connector on the base plate, and sets the displacement sensor in the adjustable embedded pipe, and the connector on the base plate is inserted into the mounting hole of the displacement sensor, and the connector is threadedly connected to the mounting hole, so that the fixed end of the displacement sensor is fixed to the base plate. The large diameter section of the movable end of the displacement sensor partially exposes the adjustable embedded pipe and passes through the displacement hole of the cover plate. The present application is not only simple in structure and convenient to assemble, which greatly reduces the construction time, but also the length of the adjustable embedded pipe is adjustable, which makes the adjustable embedded pipe highly versatile and reduces the production cost.

[0049] Example 3

[0050] This embodiment relates to a method for installing a displacement sensor in a tunnel, which is based on an installation method of a displacement sensor with an embedded body. The structure of the displacement sensor is shown in Example 1. Its function is to detect the size of the gap between the tunnel reinforced concrete layer and the cement spray layer. When a gap is generated between the reinforced concrete layer and the spray layer, the displacement sensor 2 can detect the aforementioned.

[0051] The installation method of the displacement sensor in the tunnel mainly includes the following steps:

[0052] Step 1: spray cement on the inner wall of the tunnel to form a cement spray layer;

[0053] Step 2: drilling holes in the cement spray coating and extending the holes to the inside of the tunnel rock layer to form pre-buried holes;

[0054] Step 3: Thread the connector onto the base plate, and place the base plate with the connector into the pre-buried hole.

[0055] Step 4: The adjustable embedded pipe is placed in the embedded hole, and the adjustable embedded pipe is connected and fixed to the bottom plate by threading;

[0056] Step 5: Open a mounting hole at the end of the displacement sensor, put the displacement sensor into the adjustable embedded pipe, connect and fix the displacement sensor to the base plate through the mounting hole and the connector, and make the front end of the displacement sensor exposed outside the cement spray layer;

[0057] Step 6: Install the cover plate on the pipe opening of the adjustable embedded pipe, and let the front end of the displacement sensor, i.e., the active end, and the lead wire pass through the cover plate;

[0058] Step 7: Fix the cover plate to the cement spray coating;

[0059] Step 8. Lay a steel frame on the outside of the cement spray layer. When laying the steel frame, be careful to avoid contact with the active end of the displacement sensor. Then pour cement on the steel frame to form a reinforced concrete layer, and pour the active end of the displacement sensor into the reinforced concrete layer. At this time, the displacement sensor spans the gap between the cement spray layer and the reinforced concrete layer to sense the size of the aforementioned gap.

[0060] The present application is not only convenient to install and reduces construction time, but also places the displacement sensor in the gap between the cement spray coating and the reinforced concrete layer before civil construction, thus avoiding damage to the civil construction structure.

[0061] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A method for assembling a displacement sensor with an embedded body, characterized in that: The displacement sensor with an embedded body comprises an embedded body (1) and a displacement sensor (2); the embedded body (1) comprises an adjustable embedded tube, a base plate (1.1) and a cover plate (1.5); the base plate (1.1) is detachably connected to the end of the adjustable embedded tube, and the cover plate (1.5) is detachably connected to the front end of the adjustable embedded tube; one end of the displacement sensor (2) is a fixed end and the other end is a movable end; the fixed end of the displacement sensor (2) passes through the adjustable embedded tube and is fixedly connected to the base plate (1.1) through a connector (1.2); a displacement hole (1.5.2) and a lead hole (1.5.3) are provided on the cover plate (1.5); the movable end of the displacement sensor (2) passes through the displacement hole (1.5.2), and the lead wire (2.3) of the displacement sensor (2) is led out through the lead hole (1.5.3); One end of the connecting piece (1.2) is threadedly connected to a mounting hole provided at the fixed end of the displacement sensor (2), and the other end is threadedly connected to a mounting hole provided on the base plate (1.1); The cover plate (1.5) is provided with a second external thread (1.5.1), and the cover plate (1.5) is threadedly connected to the second connecting pipe (1.4); The adjustable embedded pipe comprises a first connecting pipe (1.3) and a second connecting pipe (1.4); the first connecting pipe (1.3) is provided with a first external thread (1.3.1) along the axial direction; the second connecting pipe (1.4) is provided with a second internal thread (1.4.1) along the axial direction; the first connecting pipe (1.3) and the second connecting pipe (1.4) are threadedly connected via the second internal thread (1.4.1) and the first external thread (1.3.1); and the splicing length of the first connecting pipe (1.3) and the second connecting pipe (1.4) is adjusted by changing the threaded connection length of the first connecting pipe (1.3) and the second connecting pipe (1.4); The movable end of the displacement sensor (2) comprises a large diameter section (2.1) and a small diameter section (2.2); the small diameter section (2.1) is arranged at the front end of the large diameter section (2.1); the two can be relatively displaced and retracted; the large diameter section (2.1) is partially exposed from the cover plate (1.5); a resistance member (3) is provided at the end of the small diameter section (2.2); The assembly method comprises the following steps: Step 1: Thread the connector to the base plate, and assemble the first connecting pipe and the second connecting pipe to form an adjustable embedded pipe of a preset length; Step 2: Thread the adjustable embedded pipe to the bottom plate, insert the displacement sensor into the adjustable embedded pipe, align the mounting hole at the fixed end of the displacement sensor with the connector, and thread the displacement sensor to the connector; Step 3: Align the displacement hole on the cover plate with the movable end of the displacement sensor, let the movable end of the displacement sensor pass through the cover plate, let the lead wire of the displacement sensor pass through the lead wire hole on the cover plate, and then connect the cover plate to the front end of the second connecting tube; Step 4: Place the sealing ring in the displacement hole of the cover plate to seal the displacement hole; Step 5: Install the resistance piece to the end of the movable end of the displacement sensor.

2. The displacement sensor with embedded body according to claim 1, characterized in that: The displacement hole (1.5.2) is a conical hole, the diameter of the hole at the inlet end is smaller than the diameter of the hole at the outlet end, and the movable end of the displacement sensor (2) passes through the inlet end and the outlet end in sequence.

3. The displacement sensor with embedded body according to claim 2, characterized in that: A sealing ring (4) is provided in the displacement hole (1.5.2).

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