Sampler for detecting back silting of foundation trench of pre-paving immersed tunnel

Abstract

The utility model relates to a sampler for back-silting detection of a foundation trench of a pre-laid immersed tube tunnel, which belongs to the technical field of back-silting detection of foundation trenches of immersed tube tunnels and comprises a sampling tube, a sealing diaphragm and a sealing lifting lead. Wherein the sampling tube is used for accommodating a foundation trench back-silting sample, an opening is formed in the bottom of the sampling tube, and a bracket is fixed at the top; the sealing diaphragm is arranged at the bottom of the sampling tube and used for sealing the opening after sampling; one end of the sealing lifting wire is connected with the sealing diaphragm through the bottom of the sampling tube, the other end of the sealing lifting wire is controlled by a worker, and when the sealing lifting wire is controlled to be pulled upwards, the sealing lifting wire pulls the sealing diaphragm to move and seal the opening. According to the sampler, the opening is formed in the bottom of the sampling tube and is sealed by the sealing diaphragm, so that accurate acquisition of a back-silting sample is ensured; and through the arrangement of the sealing lifting lead wire, an operator can easily control opening and closing of the sealing diaphragm, and the operation difficulty and cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the base trench siltation detection technical field of immersed tube tunnel, especially relate to a sampler for the siltation detection of the base trench of the immersed tube tunnel of the first paving method. BACKGROUND

[0002] At present, several immersed tube tunnel projects have been successfully built in China, and rich experience and advanced technology have been accumulated in the field of the first paving method immersed tube tunnel. With its many advantages, the immersed tube tunnel is gradually becoming the preferred option for tunnel structure form in new projects.

[0003] The siltation situation needs to be paid attention to at all times in the processes of base trench excavation, block stone vibration and compaction, and gravel leveling and immersed tube tunnel sinking and installation. The setting of siltation blocking and dredging measures is premised on accurately grasping the size of the siltation amount. Siltation is derived from two aspects: one is the deposition of sediment carried by water flow, which is called scouring and silting; the other is the deposition of sediment caused by the excavation of the immersed tube base trench, which increases the cross-sectional area of the water body and reduces the flow rate of the water body, which is called falling siltation. The siltation amount is a key parameter for the quality control of the first paving method immersed tube tunnel, and the thickness and density of the siltation generally need to be detected.

[0004] In the prior art, the siltation monitoring often adopts the siltation box method and the multi-beam measurement method. The siltation box method is to place a siltation box in the base trench, and to extract the siltation amount at intervals. The siltation box method needs the cooperation of divers to place and lift the siltation box, and the siltation box cover needs to be closed underwater when lifting, which has a high cost. In addition, the siltation box can only observe the falling siltation, and vortex phenomenon occurs at the top of the box, causing the local falling siltation phenomenon to intensify, and the data cannot truly reflect the siltation situation. The multi-beam measurement method is an indirect measurement method, and the error is large when the water body is turbid or the interface characteristics are not obvious.

[0005] Therefore, how to solve the current detection problem of the siltation of the base trench of the immersed tube tunnel is a technical problem that needs to be solved urgently. CONTENT OF THE UTILITY MODEL

[0006] In view of the deficiencies in the prior art, the utility model provides a sampler for the siltation detection of the base trench of the first paving method immersed tube tunnel. The opening at the bottom of the sampling tube is set, and the opening is sealed by the sealing film, so that the siltation sample can be accurately obtained. The opening and closing of the sealing film can be easily controlled by the operator through the setting of the sealing lead.

[0007] The utility model provides a sampler for the siltation detection of the base trench of the first paving method immersed tube tunnel, which comprises:

[0008] The sampling tube is used for containing the siltation sample of the base trench, and the bottom of the sampling tube is provided with an opening, and the top is fixed with a support;

[0009] The sealing film is arranged at the bottom of the sampling tube and used for sealing the opening after sampling;

[0010] The sealing lead line is connected with the sealing film at one end of the sampling tube bottom and controlled by the staff at the other end. When the sealing lead line is pulled up, the sealing film is pulled to move and seal the opening.

[0011] The technical solution sets the opening at the bottom of the sampling tube and uses the sealing film to seal, ensuring the accurate acquisition of the backfill sample and avoiding data distortion caused by vortex phenomenon in the traditional backfill box method. The sealing lead line is set, so that the operator can easily control the opening and closing of the sealing film without diving operation, reducing the operation difficulty and cost.

[0012] In some embodiments, the sampler for backfill detection of the first-laying method immersed tube tunnel foundation trench further comprises a traction rope, one end of which is connected to the top bracket of the sampling tube, and the other end is controlled by the staff to be retracted or extended, for lifting or lowering the sampling tube. The technical solution sets the traction rope, which facilitates the staff to control the traction rope to lift or lower the sampling tube.

[0013] In some embodiments, the sampler for backfill detection of the first-laying method immersed tube tunnel foundation trench further comprises a connecting piece and a film fixing piece, one end of the connecting piece is connected to the traction rope, and the other end is provided with a hook connected with the film fixing piece, and the end of the film fixing piece away from the hook is connected to the sealing film; during the lowering of the sampler, the hook is connected with the film fixing piece to fix the position of the sealing film, and when the bottom of the sampler touches the bottom, the traction rope is relaxed, the hook is automatically separated from the film fixing piece, and the fixing of the sealing film is released. The technical solution sets the connecting piece and the film fixing piece to realize the fixing and automatic separation of the sealing film during the lowering of the sampler.

[0014] In some embodiments, the sampler for backfill detection of the first-laying method immersed tube tunnel foundation trench further comprises a film pulling line, the film fixing piece is connected with the sealing film through the film pulling line; the bottom of the sampling tube is provided with a film fixing point, one end of the film pulling line is fixed to the film fixing point, and the other end is connected with the sealing film and the film fixing piece. The technical solution sets the film pulling line and the film fixing point to effectively fix the position of the sealing film during sampling and quickly seal the opening at the bottom of the sampling tube when needed.

[0015] In some embodiments, the sampler for backfill detection of the first-laying method immersed tube tunnel foundation trench further comprises a lead line fixing device for fixing the height of the sealing lead line. The technical solution sets the lead line fixing device to effectively fix the height of the sealing lead line and prevent the sealing lead line from loosening or sliding during operation.

[0016] In some embodiments, the lifting wire fixing device comprises a lifting wire sleeve and a fixing block, the fixing block is arranged at the end of the lifting wire sleeve away from the sealing film, and is used for clamping the lifting wire sleeve to fix the height of the lifting wire. The fixing block clamps the lifting wire sleeve to fix the height of the sealing lifting wire, thereby preventing the sealing lifting wire from retracting or sliding during operation.

[0017] In some embodiments, the sealing film is provided with a first pulling point and a second pulling point, the first pulling point and the second pulling point are arranged oppositely, and the sealing lifting wire is connected with the first pulling point and the second pulling point simultaneously. The first pulling point and the second pulling point are arranged, so that the sealing lifting wire can uniformly apply force to the sealing film.

[0018] In some embodiments, the sampling tube is provided with a counterweight at the bottom for automatically falling and penetrating into the back silting material. The counterweight is arranged, so that the sampling tube can automatically fall and penetrate into the back silting material during placement.

[0019] In some embodiments, the sampling tube is made of transparent material. The transparent material is used, so that the back silting sample in the sampling tube can be observed and confirmed, and the thickness of each layer of back silting material can be measured.

[0020] In some embodiments, the sealing film is made of elastic material.

[0021] Based on the above scheme, the sampler for back silting detection of a first-laying method immersed tube tunnel base groove in the embodiment of the present application can ensure accurate acquisition of the back silting sample by arranging an opening at the bottom of the sampling tube and using the sealing film to block the opening, and can avoid data distortion caused by the vortex phenomenon in the traditional back silting box method. The sealing lifting wire is arranged, so that the operator can easily control the opening and closing of the sealing film without diving operation, thereby reducing the operation difficulty and cost. The sampler is suitable for both scouring and deposition of back silting, can more comprehensively reflect the actual back silting condition in the base groove, is not affected by the turbidity of the water body compared with the multi-beam measurement method, and can provide more accurate detection data. The back silting sampling process is simplified, the dependence on diving equipment and professional personnel is reduced, the detection cost is reduced, and the economic benefit is improved. In summary, the sampler for back silting detection of a first-laying method immersed tube tunnel base groove in the embodiment of the present application can significantly improve the efficiency and accuracy of back silting detection of a first-laying method immersed tube tunnel base groove, and can provide reliable data support for immersed tube tunnel construction quality control. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 It is the structure schematic view of sampler for first paving method immersed tube tunnel foundation trench back silt detection of the utility model;

[0024] Figure 2 It is the bottom view of sampler for first paving method immersed tube tunnel foundation trench back silt detection of the utility model;

[0025] Figure 3 It is Figure 1 The enlarged schematic view of part A in it;

[0026] Figure 4 It is Figure 1 The enlarged schematic view of part B in it;

[0027] Figure 5 It is the structure schematic view of lead fixing device in the embodiment of sampler for first paving method immersed tube tunnel foundation trench back silt detection of the utility model.

[0028] In the figure,

[0029] 1, sampling tube;2, sealing membrane;3, sealing lead;4, traction rope;5, membrane fixing piece;6, connecting piece;7, membrane pulling lead;

[0030] 101, membrane fixing point;102, counterweight;103, support;

[0031] 201, first pulling point;202, second pulling point;

[0032] 301, lead outer sleeve;302, fixed block;

[0033] 601, hook. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0035] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "transverse", "longitudinal", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] like Figures 1-5 As shown, in one embodiment of the sampler for detecting siltation in the foundation trench of a pre-laid immersed tunnel, the sampler includes a sampling tube 1, a sealing diaphragm 2, and a sealing lifting line 3; wherein, the sampling tube 1 is used to hold the siltation sample from the foundation trench, and the bottom of the sampling tube 1 has an opening, such as... Figure 2 As shown, a bracket 103 is fixed at the top; a sealing film 2 is placed at the bottom of the sampling tube 1 to seal the opening after sampling; one end of the sealing lifting line 3 is connected to the sealing film 2 through the bottom of the sampling tube 1, and the other end is controlled by the staff. When the sealing lifting line 3 is pulled up, the sealing lifting line 3 pulls the sealing film 2 to move and seal the opening.

[0039] In the above illustrative embodiment, the sampler for detecting backfilling in the trench of a pre-laid immersed tunnel uses an opening at the bottom of the sampling tube 1, sealed with a sealing diaphragm 2, to ensure accurate acquisition of backfilled samples and avoid data distortion caused by eddy currents in the traditional backfilling box method. The sealing lifting line 3 allows operators to easily control the opening and closing of the sealing diaphragm 2 without diving, reducing operational difficulty and cost. This sampler is suitable for both flushing and settling backfilling, providing a more comprehensive reflection of the actual backfilling status in the trench. Compared to multibeam bath measurement, it is unaffected by water turbidity, providing more accurate detection data. Furthermore, it simplifies the backfilling sampling process, reducing reliance on diving equipment and professionals, thereby lowering detection costs and improving economic efficiency. In summary, the sampler for detecting backfilling in the trench of a pre-laid immersed tunnel according to this embodiment can significantly improve the efficiency and accuracy of backfilling detection in the trench of a pre-laid immersed tunnel, providing reliable data support for the quality control of immersed tunnel construction.

[0040] In some embodiments, such as Figure 1As shown, the sampler for backfill detection of the trench of the immersed tube tunnel of the first paving method further comprises a traction rope 4, one end of the traction rope 4 is connected to the top bracket 103 of the sampling tube 1, and the other end is controlled to be retracted by the worker, and is used for lifting or lowering the sampling tube 1. Through the setting of the traction rope 4, the worker can control the traction rope 4 to lift or lower the sampling tube 1, which improves the flexibility and safety of the sampling process.

[0041] Further, the length of the traction rope 4 is at least greater than 3m of the sampling depth of the detection point.

[0042] In some embodiments, as shown in the drawings, Figure 3 As shown, the sampler for backfill detection of the trench of the immersed tube tunnel of the first paving method further comprises a connecting piece 6 and a film fixing piece 5, one end of the connecting piece 6 is connected to the traction rope 4, and the other end is provided with a hook 601, the hook 601 is connected with the film fixing piece 5, and the end of the film fixing piece 5 away from the hook 601 is connected to the sealing film 2; during the lowering process of the sampler, the hook 601 is connected with the film fixing piece 5 to fix the position of the sealing film 2, and when the bottom of the sampler touches the bottom, the traction rope 4 is relaxed, the hook 601 is automatically separated from the film fixing piece 5, and the fixing of the sealing film 2 is released. Through the setting of the connecting piece 6 and the film fixing piece 5, the fixing and automatic separation of the sealing film 2 during the lowering process of the sampler are realized, which can ensure the smooth progress of the sampling process, simplify the operation process, and improve the accuracy and reliability of the sampling.

[0043] In some embodiments, as shown in the drawings, Figure 1 As shown, the sampler for backfill detection of the trench of the immersed tube tunnel of the first paving method further comprises a film pulling line 7, the film fixing piece 5 is connected with the sealing film 2 through the film pulling line 7; the bottom of the sampling tube 1 is provided with a film fixing point 101, one end of the film pulling line 7 is fixed to the film fixing point 101, and the other end is connected with the sealing film 2 and the film fixing piece 5 at the same time. When the hook 601 is automatically separated from the film fixing piece 5, the sealing pulling line 3 can pull the sealing film 2 to move and block the opening at the bottom of the sampling tube 1, and at the same time, the film pulling line 7 moves downward with the sealing film 2, and when the film pulling line 7 is taut, the film pulling line 7 and the sealing pulling line 3 fix the sealing film 2 at the opening of the sampling tube 1. Through the setting of the film pulling line 7 and the film fixing point 101, the position of the sealing film 2 is effectively fixed during the sampling process, and the opening at the bottom of the sampling tube 1 can be quickly blocked when needed.

[0044] In some embodiments, as shown in the drawings, Figure 1 As shown, the sampler for backfill detection of the trench of the immersed tube tunnel of the first paving method further comprises a pulling line fixing device for fixing the height of the sealing pulling line 3. Through the setting of the pulling line fixing device, the height of the sealing pulling line 3 can be effectively fixed, the sealing pulling line 3 is prevented from loosening or sliding during the operation process, and the stability and accuracy of the sampling process are ensured.

[0045] In some embodiments, as shown in Figure 5 The sealing lead fixing device includes a sealing lead sleeve 301 sleeved on the outer periphery of the sealing lead 3 and a fixing block 302. The fixing block 302 is arranged at the end of the sealing lead sleeve 301 away from the sealing membrane 2 and is used for clamping the sealing lead sleeve 301 to fix the height of the sealing lead 3. The sealing lead sleeve 301 is clamped by the fixing block 302 to fix the height of the sealing lead 3, thereby preventing the sealing lead 3 from retracting or sliding during operation and improving the reliability and accuracy of sampling operation.

[0046] In some embodiments, as shown in Figure 2 The sealing membrane 2 is provided with a first pulling point 201 and a second pulling point 202. The first pulling point 201 and the second pulling point 202 are oppositely arranged, and the sealing lead 3 is connected to the first pulling point 201 and the second pulling point 202 at the same time. Through the arrangement of the first pulling point 201 and the second pulling point 202, the sealing lead 3 can uniformly apply force to the sealing membrane 2, so that the sealing membrane 2 is more firm when sealing the opening and the leakage of the backfill sample is prevented.

[0047] In some embodiments, as shown in Figure 1 The bottom of the sampling tube 1 is provided with a counterweight 102 for pulling the sampling tube 1 to automatically fall. Through the arrangement of the counterweight 102, the sampling tube 1 can automatically fall and penetrate into the backfill material during placement, thereby improving the convenience of sampling operation.

[0048] In some embodiments, the sampling tube 1 is made of transparent material. As an illustrative embodiment, the sampling tube 1 is made of acrylic transparent high-strength material. The use of transparent material facilitates the observation and confirmation of the backfill sample in the sampling tube 1, and at the same time, the thickness of each layer of backfill material can be measured, thereby improving the convenience and accuracy of operation.

[0049] It can be understood that the size of the sampling tube 1 should be sufficient to accommodate multiple layers of backfill material, and a step for installing the counterweight 102 is arranged. As an illustrative embodiment, the inner diameter of the sampling tube 1 is 10 cm, the height is 1.0 m, the wall thickness is 5 mm, and the bottom is provided with a thickened section. The thickened section has a wall thickness of 10 mm, and the overall thickened section is arc-shaped. The upper part of the thickened section is provided with a step for installing the counterweight 102.

[0050] In some embodiments, the sealing membrane 2 is made of elastic material. As an illustrative embodiment, the sealing membrane 2 is made of high-strength rubber membrane, and the thickness of the sealing membrane 2 is 2-4 mm.

[0051] The detection method of the sampler for detecting backfilling of a pipe tunnel base trench by the first paving method of the utility model will be described below, which includes the following steps:

[0052] S1, when detection is needed, the sampler is lowered to the detection point;

[0053] S2, the sampler is lowered to the top of the block stone or rubble, the sealing cap is pulled out, and the sealing film is pulled to seal the bottom of the sampler;

[0054] S3, the sampler is pulled up to the water surface, and the thickness of each layer of silt in the sampler is measured while the sampler is kept upright;

[0055] S4, the density of each layer of silt in the sampler is measured by a specific gravity test.

[0056] In some embodiments, the time to be detected in step S1 includes the following time nodes: 30 days after the completion of the trench excavation of the pipe section; 10 days and 3 days before the block stone is thrown and vibrated; 10 days and 3 days before the rubble is laid; 1 day before the pipe section is sunk; after dredging; and after extreme weather.

[0057] Further, in step S1, multiple detection points are selected for silt detection at each trench; in step S3, the average value of the multiple detection points is taken as the detection value of the thickness of the silt at the place; and in step S4, the silt samples at the multiple detection points are taken for the specific gravity test, and the average value of the densities of the silt at the multiple detection points is taken as the detection value of the density of the silt at the place.

[0058] In some embodiments, in step S4, a large-diameter long-piston syringe is used to collect the silt sample from above the sampling tube 1 through the support 103, and generally 100 ml is extracted.

[0059] In some embodiments, in step S2, the sampler is lowered by the gravity of the counterweight 102, and when the bottom of the sampler touches the bottom, it means that the sampler has completed the through sampling of the silt, and it is difficult for the sampler to continue to go through; and in step S3, before measuring the thickness of each layer of silt in the sampler, the counterweight 102 should be removed to avoid interference with the measurement.

[0060] In some embodiments, in step S3, when measuring the thickness of each layer of silt in the sampler, if there is an interface between each layer of silt, the thickness of each layer of silt is directly measured; and if there is no interface between each layer of turbid silt, the silt is left to stand until an interface appears, and then the thickness of each layer of silt is measured. Generally, when there is no interface between each layer of turbid silt, the silt is left to stand for 8 hours, and then the interface between each layer of silt can be observed.

[0061] In some embodiments, in step S1, the sampling device is fixed at the top of the sampling device by the traction rope, and the sealing film is fixed and positioned by the hook of the connecting piece and the film fixing piece when the sampling device is lowered; in step S2, the sampling is completed when the sampling device touches the bottom after penetrating the back silting material, the traction rope is relaxed, the hook and the film fixing piece are separated, and the positioning of the sealing film is released, at this time, the sealing film is moved to the opening at the bottom of the sampling device by pulling the sealing film through the sealing lifting lead; in step S3, the traction rope is lifted to pull the sampling device up.

[0062] In some embodiments, the sealing lifting lead is arranged in the lifting lead sheath, and a detachable fixing block is arranged at the opening at the top of the lifting lead sheath, and in step S2, after the sealing lifting lead is lifted, the opening at the top of the lifting lead sheath is blocked by the fixing block, and the sealing lifting lead is fixed.

[0063] Through the description of the plurality of embodiments of the sampling device for back silting detection of the first-laying method immersed tube tunnel base trench of the utility model, it can be seen that the sampling device for back silting detection of the first-laying method immersed tube tunnel base trench of the utility model has at least one or more of the following advantages:

[0064] 1. The sampling device for back silting detection of the first-laying method immersed tube tunnel base trench of the utility model, by arranging the opening at the bottom of the sampling tube 1 and blocking it by the sealing film 2, ensures the accurate acquisition of the back silting sample and avoids the data distortion caused by the vortex phenomenon in the traditional back silting box method.

[0065] 2. The sampling device for back silting detection of the first-laying method immersed tube tunnel base trench of the utility model, by arranging the sealing lifting lead 3, the operator can easily control the opening and closing of the sealing film 2 without diving operation, which reduces the operation difficulty and cost.

[0066] 3. The sampling device for back silting detection of the first-laying method immersed tube tunnel base trench of the utility model can be applied to both scouring and silting back silting conditions, can more comprehensively reflect the actual back silting condition in the base trench, compared with the multi-beam measurement method, is not affected by the turbidity of the water body, provides more accurate detection data, simplifies the back silting sampling process, reduces the dependence on diving equipment and professional personnel, thereby reducing the detection cost and improving the economic benefit.

[0067] Finally, it should be explained that: the embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to.

[0068] The above examples are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range of the present application claimed.

Claims

1. A sampler for pre-laid method immersed tube tunnel trench backfill detection, characterized in that, The utility model relates to a sampler for sampling the back silting sample of a foundation trench, comprising: a sampling tube for containing the back silting sample of a foundation trench, the bottom of the sampling tube being provided with an opening, and the top of the sampling tube being provided with a support; a sealing film arranged at the bottom of the sampling tube for sealing the opening after sampling; a sealing pulling line, one end of which is connected to the sealing film at the bottom of the sampling tube, and the other end of which is controlled by a worker, the sealing pulling line pulling the sealing film to move and seal the opening when the sealing pulling line is pulled up by the worker; 2. The sampler for pre-lay installation tunnel sinking caisson trench backfill detection according to claim 1, characterized in that, a traction rope, one end of which is connected to the support at the top of the sampling tube, and the other end of which is controlled by the worker to be retracted or extended, the traction rope being used to lift or lower the sampling tube; 3. The sampler for pre-lay installation tunnel sinking caisson trench backfill detection of claim 2, wherein, a connecting piece and a film fixing piece, one end of the connecting piece being connected to the traction rope, the other end of the connecting piece being provided with a hook, the hook being connected to the film fixing piece, and the film fixing piece being connected to the sealing film at an end away from the hook; during the lowering of the sampler, the hook is connected to the film fixing piece to fix the position of the sealing film, when the bottom of the sampler touches the bottom, the traction rope is relaxed, the hook is automatically separated from the film fixing piece, and the fixing of the sealing film is released.

4. The sampler for pre-lay installation tunnel sinking method trench backfill detection according to claim 3, characterized in that, a film pulling line, the film fixing piece being connected to the film fixing point through the film pulling line; the bottom of the sampling tube is provided with a film fixing point, one end of the film pulling line being fixed to the film fixing point, and the other end of the film pulling line being connected to the sealing film and the film fixing piece at the same time.

5. The sampler for pre-lay installation tunnel sinking caisson trench backfill detection of claim 1, wherein, a pulling line fixing device for fixing the height of the sealing pulling line.

6. The sampler for pre-lay installation tunnel sinking caisson trench backfill detection of claim 5, wherein, The pulling line fixing device comprises a pulling line sleeve and a fixing block, the pulling line sleeve being arranged on the outer periphery of the sealing pulling line, and the fixing block being arranged at an end of the pulling line sleeve away from the sealing film, the fixing block being used to clamp the pulling line sleeve to fix the height of the sealing pulling line.

7. The sampler for pre-lay installation tunnel sinking caisson trench backfill detection of claim 6, wherein, The sealing film is provided with a first pulling point and a second pulling point, the first pulling point and the second pulling point being arranged oppositely, and the sealing pulling line being connected to the first pulling point and the second pulling point at the same time.

8. The sampler for pre-lay installation tunnel sinking caisson backfill detection of claim 1, wherein, The bottom of the sampling tube is provided with a counterweight for pulling the sampling tube to automatically fall.

9. The sampler for pre-lay installation tunnel sinking caisson backfill detection of claim 1, wherein, The sampling tube is made of a transparent material.

10. The sampler for pre-lay installed tunnel sinking method trench backfill detection of claim 1, wherein, The sealing film is made of an elastic material.

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