Real-time monitoring device for tunnel vault void

Abstract

The utility model discloses a real-time monitoring device for tunnel vault void. The real-time monitoring device is installed on a secondary lining trolley formwork and comprises a bottom plate, an observation pipe and four tension springs. A through hole is formed in the tunnel vault position of the secondary lining trolley formwork, and four upper spring drag hooks are evenly distributed and fixed to the bottom face of the secondary lining trolley formwork and the periphery of the through hole; a connecting hole matched with the outer diameter of an observation tube is formed in the center of the bottom plate, and four lower spring drag hooks are uniformly distributed and fixed on the top surface of the edge of the bottom plate; size scale marks are marked on the outer surface of the observation pipe, the bottom of the observation pipe is welded and fixed in the connecting hole of the bottom plate, and the upper end of the observation pipe penetrates through the through hole in the secondary lining trolley template and then abuts against the bottom face of the tunnel vault position of the tunnel waterproof plate; the four tension springs are connected between the four lower spring drag hooks and the four upper spring drag hooks in a one-to-one correspondence mode. The device is simple in structure, the concrete pouring condition of the tunnel vault can be observed in real time, and whether the thickness of the secondary lining meets the design requirement or not can be checked.

Description

Technical Field

[0001] The utility model relates to a real-time monitoring device for tunnel vault hollowing. Background Art

[0002] At present, the secondary lining of the tunnel usually adopts the full hydraulic secondary lining trolley to pour the concrete layer by layer in a window-by-window manner and the symmetrical pumping pouring process from bottom to top. Since the fluidity of concrete is difficult to reach the ideal state, and the air between the two arch pouring holes is also difficult to completely empty, the secondary lining is often empty behind the secondary lining due to the limitations of the secondary lining process. It is necessary to strictly control all aspects of the construction process and take effective measures to prevent the secondary lining from being empty behind. When pouring concrete below the arch waist, the construction personnel can observe the concrete pouring situation inside the template from the pouring window 10 opened on the secondary lining trolley template 1. Since the secondary lining trolley template 1 does not have a pouring window within the range of the arch width of 6.35m (see Figure 1 ), when the concrete is poured to the top row of pouring windows, the pouring windows need to be closed to pour the concrete above the side walls. As a result, it is impossible to accurately observe the concrete pouring situation of the vault part and cannot effectively ensure the fullness of the concrete in the formwork above the side walls. Therefore, observation measures need to be taken during construction to prevent the vault from falling off. Utility Model Content

[0003] The utility model aims to overcome the defects of the prior art and provide a real-time monitoring device for tunnel vault hollowing, which has a simple structure and can not only observe the concrete pouring of the tunnel vault in real time, but also check whether the secondary lining thickness meets the design requirements.

[0004] The purpose of the utility model is achieved as follows: a real-time monitoring device for tunnel vault degassing is installed on the second lining trolley template and includes a bottom plate, an observation tube and four tension springs; wherein,

[0005] A through hole is opened at the tunnel vault position of the secondary lining trolley template, and four upper spring hooks are evenly fixed on the bottom surface of the secondary lining trolley template and on the periphery of the through hole;

[0006] A connection hole matching the outer diameter of the observation tube is provided at the center of the bottom plate, and four lower spring hooks are evenly fixed on the top surface of the edge of the bottom plate;

[0007] The observation tube is a hollow steel tube whose length is greater than the thickness of the secondary lining. The outer surface of the observation tube is marked with size scale lines. The bottom of the observation tube is welded and fixed in the connection hole on the bottom plate. The upper end of the observation tube passes through the perforation on the template of the secondary lining trolley and abuts against the bottom surface of the tunnel vault position of the tunnel waterproofing plate.

[0008] Four tension springs are connected one by one between four lower spring hooks on the bottom plate and four upper spring hooks on the second lining trolley template.

[0009] In the above-mentioned real-time monitoring device for tunnel vault degassing, the bottom plate is made of a square steel plate with a side length of 150 to 200 mm, and the thickness of the bottom plate is 5 to 16 mm; the outer diameter of the observation tube is 30 to 50 mm.

[0010] In the above-mentioned real-time monitoring device for tunnel vault voiding, the upper spring hook and the lower spring hook are made of upright welded nuts.

[0011] In the above-mentioned real-time monitoring device for tunnel vault hollowing, the material diameter of the tension spring is 2.5 mm, the outer diameter of the tension spring is 16 mm, and the free length of the tension spring is 82 mm.

[0012] The real-time monitoring device for tunnel vault hollowing of the utility model has the following characteristics: it is composed of a tension spring, a steel plate, an observation tube and a nut, and is connected to the secondary lining trolley template through a tension spring. It can not only observe the pouring of tunnel vault concrete, but also check whether the secondary lining thickness meets the design requirements, ensure the construction quality of the secondary lining and reduce the occurrence of quality defects, ensure that the lining concrete construction quality meets the requirements, and provide reliable guarantee for tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the secondary lining trolley template;

[0014] Figure 2 It is a cross-sectional view of a real-time monitoring device for tunnel vault hollowing according to the utility model. DETAILED DESCRIPTION

[0015] The utility model will be further described below in conjunction with the accompanying drawings.

[0016] See also Figure 2 The real-time monitoring device for tunnel vault degassing of the utility model is installed on the second lining trolley template 1 and includes a bottom plate 2, an observation tube 3 and four tension springs 4; wherein,

[0017] A through hole is opened at the tunnel vault position of the secondary lining trolley template 1, and four upper spring hooks 11 are evenly fixed on the bottom surface of the secondary lining trolley template 1 and on the periphery of the through hole; the upper spring hooks 11 are vertically welded to the M20 nuts on the bottom surface of the secondary lining trolley template 1;

[0018] A connection hole matching the outer diameter of the observation tube 3 is provided at the center of the bottom plate 1, and four lower spring hooks 21 are evenly fixed on the top surface of the edge of the bottom plate 1; the lower spring hooks 21 are M20 nuts welded upright on the bottom plate 2; the bottom plate 2 can be a square steel plate with a side length of 150 to 200 mm and a thickness of 5 to 16 mm, or a round steel plate; when the bottom plate 2 is a square steel plate, the four lower spring hooks 21 are fixed on the top surfaces of the four corners of the bottom plate 2 in a one-to-one correspondence;

[0019] The observation tube 3 is a hollow steel tube whose length is greater than the thickness of the secondary lining, and the outer diameter of the observation tube 3 is 30-50 mm; the outer surface of the observation tube 3 is marked with size scale lines, and the bottom of the observation tube 3 is welded and fixed in the connection hole on the bottom plate 2. The upper end of the observation tube 3 passes through the perforation on the secondary lining trolley template 1 and abuts against the bottom surface of the tunnel vault position of the tunnel waterproofing board 5. Due to different surrounding rocks and different lining types of tunnels, the secondary lining has different lining thicknesses. The length of the observation tube 3 is adjusted according to the actual situation to better monitor the vault degassing situation.

[0020] The four tension springs 4 are connected one by one between the four lower spring hooks 21 on the base plate 2 and the four upper spring hooks 11 on the second lining trolley template 1; the material diameter of the tension spring 4 is 2.5 mm, the outer diameter of the tension spring 4 is 16 mm, and the free length of the tension spring 4 is 82 mm; the four tension springs 4 should be able to withstand the dead weight of the base plate 2 and the observation tube 3.

[0021] After completing the initial support of the tunnel and the construction of the tunnel waterproof layer, the real-time monitoring device for the hollowing out of the tunnel vault of the utility model is installed on the secondary lining trolley template 1, that is, the upper ends of the four tension springs 4 are connected to the four upper spring hooks 11 on the secondary lining trolley template 1 one by one, and the observation tube 3 is inserted into the perforation on the secondary lining trolley template 1 until the upper end of the observation tube 3 is against the bottom surface of the tunnel waterproof plate 5. At this time, the observation tube 3 exposes the size scale line on the bottom surface of the secondary lining trolley template 1 as the reference line; when the secondary lining concrete is poured to the top row of pouring windows, close that row of pouring windows. The monitoring device of the utility model can be used to observe the concrete pouring situation, that is, to check whether the reference mark line on the observation tube 3 drops. If the reference line on the observation tube 3 is found to drop during the concrete pouring process, the difference between the reading of the reference line after the drop and the size scale line on the observation tube 3 exposed on the bottom surface of the secondary lining trolley template 1 can be used to determine that the lining vault concrete is empty and it is necessary to continue pumping concrete; if the concrete slurry flows out from the connection hole of the bottom plate 2 where the observation tube 3 is installed and the reference line on the observation tube 3 is not seen to drop, the construction personnel can suspend the pumping of the lining concrete. After the secondary lining concrete is poured, the observation tube 3 is pulled out before the initial setting, so that the real-time monitoring device for tunnel vault emptying of the utility model can be reused.

[0022] Since the upper end of the observation tube 3 is against the bottom surface of the tunnel waterproof board 5, and the waterproof board 5 is hung from top to bottom and has a certain amount of loose laying, the lining concrete is poured from bottom to top on both sides of the vault. During the pouring process, the rise of the concrete will squeeze the waterproof boards 5 on both sides of the vault, so that the waterproof boards 5 at the vault position will have a downward force, and the waterproof board 5 will press down the observation tube 3, so that the observation tube 3 overcomes the tension of the four tension springs 4 and moves downward, and then it is judged that there is a hollow phenomenon in the lining vault concrete. If the concrete slurry flows out from the connection hole of the bottom plate 2 where the observation tube 3 is installed and the reference line on the observation tube 3 does not drop, it means that the concrete has been poured to the upper end of the observation tube 3, so it is judged that there is no hollow phenomenon in the lining vault concrete.

[0023] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A real-time monitoring device for tunnel vault degassing, installed on the secondary lining trolley template and comprising a bottom plate, an observation tube and four tension springs; characterized in that: A through hole is opened at the tunnel vault position of the secondary lining trolley template, and four upper spring hooks are evenly fixed on the bottom surface of the secondary lining trolley template and on the periphery of the through hole; A connection hole matching the outer diameter of the observation tube is provided at the center of the bottom plate, and four lower spring hooks are evenly fixed on the top surface of the edge of the bottom plate; The observation tube is a hollow steel tube whose length is greater than the thickness of the secondary lining. The outer surface of the observation tube is marked with size scale lines. The bottom of the observation tube is welded and fixed in the connection hole on the bottom plate. The upper end of the observation tube passes through the perforation on the template of the secondary lining trolley and abuts against the bottom surface of the tunnel vault position of the tunnel waterproofing plate. Four tension springs are connected one by one between four lower spring hooks on the bottom plate and four upper spring hooks on the second lining trolley template.

2. The real-time monitoring device for tunnel vault degassing according to claim 1, characterized in that: The bottom plate is a square steel plate with a side length of 150 to 200 mm, and the thickness of the bottom plate is 5 to 16 mm; the outer diameter of the observation tube is 30 to 50 mm.

3. The real-time monitoring device for tunnel vault degassing according to claim 1, characterized in that: The upper spring hook and the lower spring hook adopt upright welded nuts.

4. The real-time monitoring device for tunnel vault degassing according to claim 1, characterized in that: The material diameter of the tension spring is 2.5 mm, the outer diameter of the tension spring is 16 mm, and the free length of the tension spring is 82 mm.

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