CN112857299B - Mounting method of displacement sensor for tunnel - Google Patents
Mounting method of displacement sensor for tunnel Download PDFInfo
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- CN112857299B CN112857299B CN202011604623.1A CN202011604623A CN112857299B CN 112857299 B CN112857299 B CN 112857299B CN 202011604623 A CN202011604623 A CN 202011604623A CN 112857299 B CN112857299 B CN 112857299B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
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Abstract
The invention relates to a method for installing a displacement sensor for a tunnel, and belongs to the technical field of tunnel displacement sensor installation. Carrying out cement spraying on the inner wall of the tunnel to form a cement spraying layer; punching the cement spraying layer and extending the cement spraying layer to the inside of the tunnel rock-soil layer to form a pre-buried hole; connecting a connecting piece on a bottom plate in a threaded manner, arranging the bottom plate in the embedded hole, arranging an adjustable embedded pipe in the embedded hole, and connecting the adjustable embedded pipe with the bottom plate; the tail end of the displacement sensor is provided with a mounting hole, the displacement sensor is placed in the adjustable embedded pipe, the displacement sensor is connected with the bottom plate through the mounting hole and the connecting piece, and meanwhile, the front end of the displacement sensor is exposed out of the cement spraying layer; an upper cover plate is arranged at the pipe orifice of the adjustable embedded pipe, and the front end, namely the movable end, of the displacement sensor and a lead wire penetrate out of the cover plate; the cover plate is fixed to the cement sprayed layer. This application has reduced the engineering time, and installs displacement sensor in advance before the civil engineering, has avoided the destruction to the civil engineering structure.
Description
Technical Field
The invention relates to a method for installing a displacement sensor for a tunnel, and belongs to the technical field of tunnel displacement sensor installation.
Background
The tunnel structure is influenced by complex surrounding rocks and geological hydrological conditions, and the safety of the structure is always a very important problem in engineering construction, operation and maintenance. At present, the engineering world at home and abroad has consensus, and any one major engineering has the risk of accidents and even accidents. How to find the problem as early as possible before the accident happens, and how to take necessary measures to reduce the accident and loss becomes the primary problem to be considered and solved in the engineering field.
In the tunnel construction process, the primary tunnel support is a key for ensuring construction safety, can fully exert the self bearing capacity of the surrounding rock, quickly seal the surrounding rock, and avoid collapse of the surrounding rock due to weathering and hydration caused by long-time exposure and influence of water, air and the like; the secondary lining is the cast concrete or reinforced concrete lining applied on the inner side of the primary support in the tunnel engineering construction. And the secondary lining and the primary support jointly form a composite lining tunnel primary support to bear load. In order to ensure the firmness of connection between the secondary lining and the inside of the tunnel, displacement sensors are arranged inside the secondary lining and the tunnel and used for detecting whether a gap is generated between the secondary lining and the inside of the tunnel. However, in the existing installation method of the displacement sensor, after the secondary lining is finished, holes are drilled into the tunnel, the embedded part extends into the tunnel along the holes, and then the embedded part is arranged in the embedded part through the displacement sensor.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for installing a displacement sensor for a tunnel in view of the prior art, which not only has simple structure and convenient installation, but also reduces the construction time and avoids the damage to the civil structure.
The technical scheme adopted by the invention for solving the problems is as follows: a displacement sensor for a tunnel is mounted on the inner wall of the tunnel through a pre-buried body, one end of the displacement sensor is a fixed end, the other end of the displacement sensor is a movable end, the fixed end of the displacement sensor penetrates through an adjustable pre-buried pipe and is fixedly connected with a bottom plate through a connecting piece, and a displacement hole and a lead hole are formed in a cover plate; the embedded body comprises an adjustable embedded pipe, a bottom plate and a cover plate, the bottom plate is detachably connected with the tail end of the adjustable embedded pipe, and the cover plate is detachably connected with the front end of the adjustable embedded pipe; the installation method comprises the following steps:
step one, carrying out cement spraying on the inner wall of the tunnel to form a cement spraying layer;
secondly, punching the cement spraying layer and extending the cement spraying layer into the tunnel rock-soil layer to form a pre-buried hole;
step three, connecting the connecting piece on the bottom plate in a threaded manner, arranging the bottom plate with the connecting piece in the pre-buried hole,
fourthly, arranging the adjustable embedded pipe in the embedded hole, and fixedly connecting the adjustable embedded pipe with the bottom plate in a threaded manner;
fifthly, arranging a mounting hole at the tail end of the displacement sensor, placing the displacement sensor into the adjustable embedded pipe, connecting and fixing the displacement sensor and the bottom plate through the mounting hole and the connecting piece, and simultaneously exposing the front end of the displacement sensor out of the cement spraying layer;
sixthly, mounting an upper cover plate on the pipe orifice of the adjustable embedded pipe, and enabling the front end, namely the movable end, of the displacement sensor and the lead to penetrate out of the cover plate;
step seven, fixing the cover plate on the cement spraying layer;
and step eight, paving a reinforcing steel frame outside the cement spraying layer, paying attention to avoid the contact with the movable end of the displacement sensor when paving the reinforcing steel frame, then pouring cement into the reinforcing steel frame to form a reinforced concrete layer, pouring the movable ends of the displacement sensor into the reinforced concrete layer together, and enabling the displacement sensor to stretch across the gap between the cement spraying layer and the reinforced concrete layer at the moment for sensing the size of the gap.
The adjustable embedded pipe in the fourth step comprises a first connecting pipe and a second connecting pipe, wherein a first external thread is formed on the first connecting pipe along the axial direction, a second internal thread is formed on the second connecting pipe along the axial line, the first connecting pipe and the second connecting pipe are screwed through the second internal thread and the first external thread, and the length of the first connecting pipe and the second connecting pipe which are spliced is adjusted by changing the length of the first connecting pipe and the second connecting pipe which are screwed through the threads.
The bottom plate is provided with a first internal thread, so that the bottom plate is in threaded connection with the first connecting pipe.
And the cover plate is provided with a second external thread, so that the cover plate is in threaded connection with the second connecting pipe.
And a displacement hole and a lead hole are formed in the cover plate in the sixth step, the top of the displacement sensor penetrates through the displacement hole, and a lead of the displacement sensor is led out through the lead hole.
And a plurality of thread fixing holes are formed in the cover plate in the annular direction at even intervals, the thread fixing holes are formed in the outer sides of the displacement hole and the lead hole, and the cover plate is fixed to the cement spraying layer through the matching of the thread fixing pieces and the thread fixing holes, so that the seventh step is realized.
The displacement hole is a tapered hole, the diameter of the inlet end orifice is smaller than that of the outlet end orifice, and the movable end of the displacement sensor sequentially penetrates through the inlet end and the outlet end.
And a sealing ring is arranged in the displacement hole.
The movable end of the displacement sensor is provided with a large-diameter section and a small-diameter section, the small-diameter section is arranged at the front end of the large-diameter section and can relatively displace and stretch, and the large-diameter section is partially exposed out of the cover plate; and the end part of the small-diameter section is provided with a resistance part.
Compared with the prior art, the invention has the advantages that: a method for installing displacement sensor for tunnel includes drilling a pre-buried hole before laying reinforcing steel bar frame, connecting piece to bottom plate by screw thread, inserting adjustable pre-buried pipe into pre-buried hole, fixing one end of adjustable pre-buried pipe to bottom plate, inserting displacement sensor into pre-buried pipe and fixing it to bottom plate, installing cover plate to pipe mouth of adjustable pre-buried pipe and fixing it to cement spraying layer. The displacement sensor is installed displacement sensor in pre-buried downthehole before the civil engineering, and the reinforcing bar frame is laid to cement spraying coating skin again to the back, and pouring cement forms reinforced concrete layer for displacement sensor spanes the clearance on cement spraying coating and reinforced concrete layer, is used for responding to the size in aforementioned clearance. This application installation is convenient, has reduced the engineering time, locates displacement sensor in the clearance on cement spraying layer and reinforced concrete layer before the civil engineering moreover, has avoided the destruction to the civil engineering structure.
Drawings
Fig. 1 is a schematic view of a displacement sensor with an embedded body according to an embodiment of the present invention;
FIG. 2 is an exploded view of the mid-bottom plate, adjustable pre-buried pipe and cover plate of FIG. 1;
FIG. 3 is a schematic view of the cover plate of FIG. 2;
in the figure, 1 pre-buried body, 1.1 bottom plate, 1.1.1 first internal thread, 1.2 connecting piece, 1.3 first connecting pipe, 1.3.1 first external thread, 1.4 second connecting pipe, 1.4.1 second internal thread, 1.5 cover plate, 1.5.1 second external thread, 1.5.2 displacement hole, 1.5.3 lead hole, 1.5.4 thread fixing hole, 2 displacement sensor, 2.1 large diameter section, 2.2 small diameter section, 2.3 lead, 3 resistance piece, 4 sealing ring.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the installation method of the displacement sensor for the tunnel in this embodiment is based on an installation method of a displacement sensor with an embedded body, the displacement sensor with an embedded body includes an embedded body 1 and a displacement sensor 2, the embedded body 1 includes an adjustable embedded pipe, a bottom plate 1.1 and a cover plate 1.5, one end of the adjustable embedded pipe is provided with the bottom plate 1.1, and the adjustable embedded pipe and the bottom plate are fixed by threaded connection. One end of the displacement sensor 2 is a fixed end, the other end of the displacement sensor is a movable end, the fixed end of the displacement sensor 2 penetrates through the adjustable embedded pipe, and the movable end of the displacement sensor 2 is exposed out of the adjustable embedded pipe. The mounting hole at the center of the bottom plate 1.1 is in threaded connection with one end of the connecting piece 1.2, the mounting hole of the displacement sensor is formed in the center of the fixed end of the displacement sensor 2, the mounting hole of the displacement sensor is inserted into the connecting piece 1.2, and the mounting hole and the connecting piece are in threaded connection, so that the displacement sensor 2 is fixed on the bottom plate 1.1. The other end of the adjustable embedded pipe is provided with a cover plate 1.5 which is fixedly connected through threads. A displacement hole 1.5.2 and a lead hole 1.5.3 are formed in the cover plate 1.5, the movable end of the displacement sensor 2 penetrates out of the displacement hole 1.5.2, the displacement sensor 2 is fixed in the adjustable embedded pipe, and a lead 2.3 of the displacement sensor 2 is led out of the lead hole 1.5.3.
As shown in fig. 2, the adjustable pre-buried pipe includes a first connection pipe 1.3 and a second connection pipe 1.4, and the diameter of the first connection pipe 1.3 is smaller than that of the second connection 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, the inner peripheral wall of the second connecting pipe 1.4 is provided with a second internal thread 1.4.1 along the axial line, the first connecting pipe 1.3 is arranged in the second connecting pipe 1.4, and the first external thread 1.3.1 is screwed with the second internal thread 1.4.1. The length of the first connecting pipe 1.3 and the second connecting pipe 1.4 is adjusted by the screwing length. The adjustable embedded pipe is suitable for embedded holes with different depths, so that the adjustable embedded pipe is high in universality.
The bottom plate 1.1 is provided with a first internal thread 1.1, and the bottom plate 1.1 is in threaded connection with a first connecting pipe 1.3. A second external thread 1.5.1 is arranged on the cover plate 1.5, and the cover plate 1.5 is in threaded connection with a second connecting pipe 1.4. 3 fixing threaded holes 1.5.4 are formed in the cover plate 1.5 in the circumferential direction, and bolts penetrate through the fixing threaded holes 1.5.4, so that the cover plate 1.5 is fixed on the inner wall of the tunnel.
As shown in fig. 3, the displacement bore 1.5.2 has an inlet end orifice diameter smaller than the displacement bore 1.5.2 outlet end orifice diameter, so that the displacement bore 1.5.2 is a tapered bore.
A sealing ring 4 is arranged in the displacement hole 1.5.2 to seal the displacement hole 1.5.2, so that sundries and the like are prevented from entering the inner cavity of the adjustable embedded pipe.
As shown in fig. 1, 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 large diameter section and the small diameter section can relatively displace and stretch, and part of the large diameter section 2.1 is exposed out of the cover plate 1.5; the end of the small diameter section 2.2 is provided with a resistance piece 3. When pouring cement, make 2 major diameter sections 2.1 of displacement sensor and resistance 3 inlay in the reinforced concrete dirt layer, avoid having the relation of connection between displacement sensor 2 and the reinforced concrete dirt layer. When a gap is generated between the reinforced concrete layer and the sprayed layer, the displacement sensor 2 can detect the gap.
A mounting method of a displacement sensor for a tunnel comprises the following steps:
step one, carrying out cement spraying on the inner wall of the tunnel to form a cement spraying layer;
secondly, punching the cement spraying layer and extending the cement spraying layer into the tunnel rock-soil layer to form a pre-buried hole;
step three, connecting the connecting piece on the bottom plate in a threaded manner, arranging the bottom plate with the connecting piece in the pre-buried hole,
fourthly, arranging the adjustable embedded pipe in the embedded hole, and fixedly connecting the adjustable embedded pipe with the bottom plate in a threaded manner;
fifthly, arranging a mounting hole at the tail end of the displacement sensor, placing the displacement sensor into the adjustable embedded pipe, connecting and fixing the displacement sensor and the bottom plate through the mounting hole and the connecting piece, and simultaneously exposing the front end of the displacement sensor out of the cement spraying layer;
step six, installing an upper cover plate on the pipe orifice of the adjustable embedded pipe, and enabling the front end, namely the movable end, of the displacement sensor and the lead to penetrate out of the cover plate;
step seven, fixing the cover plate on the cement spraying layer;
step eight, paving a reinforcing steel frame outside the cement spraying layer, paying attention to avoid contacting with the movable end of the displacement sensor when paving the reinforcing steel frame, then pouring cement into the reinforcing steel frame to form a reinforced concrete layer, and pouring the movable end of the displacement sensor into the reinforced concrete layer together, wherein the displacement sensor stretches across the gap between the cement spraying layer and the reinforced concrete layer at the moment and is used for sensing the size of the gap.
This application is not only installed conveniently, has reduced the engineering time, locates displacement sensor in the clearance on cement spraying layer and reinforced concrete layer before the civil engineering moreover, has avoided the destruction to the civil engineering structure.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (9)
1. A mounting method of a displacement sensor for a tunnel is characterized in that: installing a displacement sensor (2) on the inner wall of a tunnel through an embedded body (1), wherein one end of the displacement sensor (2) is a fixed end, the other end of the displacement sensor is a movable end, the fixed end of the displacement sensor (2) penetrates through an adjustable embedded pipe and is fixedly connected with a bottom plate (1.1) through a connecting piece (1.2), and a displacement hole (1.5.2) and a lead hole (1.5.3) are formed in a cover plate (1.5); the embedded body (1) comprises an adjustable embedded pipe, a bottom plate (1.1) and a cover plate (1.5), wherein the bottom plate (1.1) is detachably connected with the tail end of the adjustable embedded pipe, and the cover plate (1.5) is detachably connected with the front end of the adjustable embedded pipe; the installation method mainly comprises the following steps:
firstly, cement spraying is carried out on the inner wall of the tunnel to form a cement spraying layer;
step two, punching the cement spraying layer and extending the cement spraying layer into the tunnel rock-soil layer to form a pre-buried hole;
step three, connecting the connecting piece on the bottom plate in a threaded manner, arranging the bottom plate (1.1) with the connecting piece (1.2) in the pre-buried hole,
fourthly, arranging the adjustable embedded pipe in the embedded hole, and connecting and fixing the adjustable embedded pipe and the bottom plate;
fifthly, arranging a mounting hole at the tail end of the displacement sensor, placing the displacement sensor into the adjustable embedded pipe, connecting and fixing the displacement sensor and the bottom plate through the mounting hole at the tail end and the connecting piece, and exposing the front end of the displacement sensor out of the adjustable embedded pipe to the outside of the cement spraying layer;
sixthly, mounting an upper cover plate on the pipe orifice of the adjustable embedded pipe, and enabling the front end, namely the movable end, of the displacement sensor to penetrate out of a displacement hole (1.5.2) of the cover plate, and enabling a lead of the displacement sensor to penetrate out of a lead hole (1.5.3) of the cover plate;
step seven, fixing the cover plate on the cement spraying layer;
and step eight, paving a reinforcing steel frame outside the cement spraying layer, paying attention to avoid the contact with the movable end of the displacement sensor when paving the reinforcing steel frame, then pouring cement into the reinforcing steel frame to form a reinforced concrete layer, pouring the movable end of the displacement sensor into the reinforced concrete layer together, and enabling the displacement sensor to stretch across the gap between the cement spraying layer and the reinforced concrete layer at the moment for sensing the size change of the gap.
2. The method for mounting a displacement sensor for a tunnel according to claim 1, wherein: the adjustable embedded pipe in the fourth step comprises a first connecting pipe (1.3) and a second connecting pipe (1.4), wherein a first external thread (1.3.1) is formed on the first connecting pipe (1.3) along the axial direction, a second internal thread (1.4.1) is formed on the second connecting pipe (1.4) along the axial direction, the first connecting pipe (1.3) and the second connecting pipe (1.4) are screwed through 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 screwing length of the first connecting pipe (1.3) and the second connecting pipe (1.4).
3. The method for installing the displacement sensor for the tunnel according to claim 2, wherein: the bottom plate (1.1) is provided with a first internal thread (1.1.1) so that the bottom plate (1.1) is in threaded connection with the first connecting pipe (1.3).
4. The method for mounting a displacement sensor for a tunnel according to claim 2, wherein: and a second external thread (1.5.1) is arranged on the cover plate (1.5), so that the cover plate (1.5) is in threaded connection with the second connecting pipe (1.4).
5. The installation method of the displacement sensor for the tunnel according to claim 1, wherein: and a displacement hole (1.5.2) and a lead hole (1.5.3) are formed in the cover plate (1.5) in the sixth step, the top of the displacement sensor (2) penetrates through the displacement hole (1.5.2), and a lead (2.3) of the displacement sensor (2) is led out through the lead hole (1.5.3).
6. The method for mounting a displacement sensor for a tunnel according to claim 5, wherein: the cover plate (1.5) is provided with a plurality of thread fixing holes (1.5.4) which are uniformly arranged at intervals in the circumferential direction, the thread fixing holes (1.5.4) are arranged on the outer sides of the displacement holes (1.5.2) and the lead holes (1.5.3), and the cover plate (1.5) is fixed on a cement spraying layer through the matching of a thread fixing piece and the thread fixing holes (1.5.4).
7. The installation method of the displacement sensor for the tunnel according to claim 5, wherein: the displacement hole (1.5.2) is a taper hole, the diameter of the inlet end orifice is smaller than that of the outlet end orifice, and the movable end of the displacement sensor (2) sequentially penetrates through the inlet end and the outlet end.
8. The method for installing the displacement sensor for the tunnel according to claim 7, wherein: and a sealing ring (4) is arranged in the displacement hole (1.5.2).
9. The method for mounting a displacement sensor for a tunnel according to claim 1, wherein: the movable end of the displacement sensor (2) is provided with 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 large-diameter section and the small-diameter section can relatively displace and stretch, and the large-diameter section (2.1) is partially exposed out of the cover plate (1.5); the end part of the small-diameter section (2.2) is provided with a resistance part (3).
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| CN202011604623.1A CN112857299B (en) | 2020-12-30 | 2020-12-30 | Mounting method of displacement sensor for tunnel |
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Effective date of registration: 20211109 Address after: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Applicant after: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Address before: 278 Chengjiang Middle Road, Jiangyin hi tech Zone, Wuxi City, Jiangsu Province Applicant before: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Applicant before: WUXI FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Applicant before: FASTEN GROUP Co.,Ltd. |
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