Pipe drawing auxiliary device for hydraulic engineering covering layer grouting
By installing an exhaust pipe and a gas sensor on the grouting pipe, combined with limiting components and internal threaded components, the problem of not being able to distinguish the grouting state of the stratum in the existing technology has been solved, thereby improving the grouting effect and construction efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING ZHENGYANG GEOTECHNICAL ENGINEERING CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-05-05
AI Technical Summary
In existing technologies, pressure gauges are directly installed on the grouting pipe for overall pressure monitoring, which cannot distinguish the grouting status of different strata, resulting in poor grouting effect and discontinuous pipe pulling, thus affecting construction efficiency.
An exhaust pipe and a gas sensor are installed on the grouting pipe. Each grouting section is sealed by a sealing structure. The gas sensor detects the gas discharge. The exhaust pipe is fixed by a limiting component and an internal thread component to ensure that the gas is discharged only through the exhaust pipe, thereby achieving accurate monitoring of the grouting section and continuous pipe pulling.
It improved the grouting effect and construction efficiency, ensured the continuity and accuracy of the grouting process, and reduced discontinuities in construction.
Smart Images
Figure CN224199906U_ABST
Abstract
Description
Technical Field
[0001] A pipe-pulling auxiliary device for grouting cover layer in water conservancy projects is disclosed, which is used to assist in pipe-pulling during grouting of cover layer in water conservancy projects and belongs to the field of pipe-pulling auxiliary technology. Background Technology
[0002] The primary function of cofferdams is to impound water. Most cofferdam projects are required to be constructed and operational within a single dry season. Among the various aspects of cofferdam construction, the construction of the cofferdam foundation for seepage prevention is particularly crucial, as its effectiveness directly determines the normal operation of the cofferdam project.
[0003] Controlled grouting is required for the overburden layers (including sand and gravel layers and two layers of crushed stone soil) within the cofferdam. If sand-mixed, paste-like, or chemical grouting is used, the "pull-out method" or "sinking method" is recommended. This involves using the casing that follows the drilling as the grout inlet pipe, utilizing the tight contact between the casing and the borehole wall to withstand the high grouting pressure. The large diameter of the casing can significantly reduce the occurrence of pipe blockage. During the grouting process, different grout mix ratios and grout types are used depending on the degree of cavitation, leakage rate, and water head of the grouting strata. Reasonable process control is employed to regulate the grout's setting time and diffusion range, achieving both seepage prevention requirements and economic efficiency.
[0004] The construction process of the "tube pulling method or tube sinking method" is as follows: site leveling → surveying and setting out → equipment positioning → drilling to the designed hole depth in one go → first stage grouting → pulling out the casing → second stage grouting → pulling out the casing → final stage grouting → grouting end → sealing the hole.
[0005] In existing technologies, the overall pressure is monitored using a pressure gauge during grouting, and the grouting pipe is then pulled out. This presents the following technical problems:
[0006] Existing technology directly installs pressure gauges on the grouting pipe for overall pressure monitoring, which cannot distinguish the grouting status of different strata. This can easily lead to poor grouting effect and discontinuous pipe pulling, thus affecting construction efficiency. Utility Model Content
[0007] The purpose of this utility model is to provide an auxiliary device for pulling out pipes for grouting the cover layer in water conservancy projects, which solves the problem that the existing technology directly sets a pressure gauge on the grouting pipe for overall pressure monitoring, which cannot distinguish the grouting status of different strata, thus easily causing poor grouting effect and discontinuous pipe pulling, thereby affecting construction efficiency.
[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0009] A pipe-pulling auxiliary device for grouting cover layer in water conservancy projects includes an exhaust pipe movably mounted on the grouting pipe to exhaust gas in each grouting section during grouting; a gas sensor mounted on the exhaust pipe to sense whether gas is being discharged from each grouting section; and a sealing structure mounted on the exhaust pipe that cooperates with the borehole seal to seal the grout outlet of the grouting pipe within each grouting section requiring grouting. The sealing structure has exhaust holes corresponding to the exhaust pipe seal. In the initial state, the sealing structure is separated from the borehole, and the sealing structure cooperates with the borehole seal under the force of the exhaust pipe.
[0010] Furthermore, the grouting pipe is provided with at least one limiting component and an internal thread component;
[0011] The limiting component includes a connecting rod A connected to the grouting pipe, and a limiting ring disposed on the connecting rod A;
[0012] The internal threaded component includes a connecting rod B connected to the grouting pipe, and an internal thread ring is provided on the connecting rod B;
[0013] The exhaust pipe is provided with an external thread that mates with the internal thread ring thread, and the exhaust pipe is in sync with the sliding rotation of the limit ring.
[0014] Furthermore, the sealing structure includes a sealing disc disposed on the grouting pipe, an elastic sealing structure disposed on the edge of the sealing disc, an exhaust hole disposed on the sealing disc corresponding to the exhaust pipe seal, and the diameter of the sealing disc being smaller than the diameter of the borehole.
[0015] The elastic sealing structure includes a ring, elastic sheets evenly arranged on the outer edge of the sealing disc and the ring, and a sealing gasket arranged on the outer edge of the sealing disc and the ring and fitted on the outside of the elastic sheets. The outer diameter of the ring is smaller than the diameter of the sealing disc, and a force-bearing ring that cooperates with the exhaust pipe is also provided on the ring.
[0016] Furthermore, a groove for securing the sealing gasket is provided on one side of the outer edge of the sealing disc and the ring, and a gasket for pressing the sealing gasket is provided in the groove. At the groove position, the ring and the sealing disc are provided with screw holes, and bolts for pressing the gasket are provided in the screw holes.
[0017] Furthermore, a threaded hole is provided on the sealing disc located outside the vent hole;
[0018] Located at the air intake end of the exhaust pipe, the exhaust pipe is equipped with a mounting plate with fixing holes;
[0019] The air intake end of the exhaust pipe is sealed to the exhaust port on the sealing plate through a telescopic hose. The telescopic hose includes two connecting discs with mounting holes and a telescopic pipe body connected to the connecting discs. One connecting disc is connected to the threaded hole on the sealing plate by bolts, and the other connecting disc is fixed by bolts and nuts through mounting holes and fixing holes.
[0020] Furthermore, the two connecting discs are sealed to the sealing disc and the mounting disc respectively by sealing rings.
[0021] Furthermore, the exhaust pipe is provided with an upper limit block and a lower limit block for pushing and pulling the force ring.
[0022] Furthermore, the gas sensor is a pressure sensor and / or a gas flow meter.
[0023] Compared with the prior art, the advantages of this utility model are:
[0024] I. This utility model improves construction efficiency by installing an exhaust pipe on the grouting pipe and a gas sensor on the exhaust pipe. During the grouting process from bottom to top, each grouting section is sealed by a sealing structure. This ensures that when grout is poured into the corresponding sealed grouting section, the gas inside will only be discharged through the exhaust pipe. When the gas sensor detects that the exhaust gas is greater than or equal to a given value, it indicates that the grouting is not full. When the grouting is full, the gas sensor will detect that the exhaust gas is less than the given value. At this time, the construction personnel can know that the grouting is full and can then pull out the pipe to the next grouting section or end the grouting process.
[0025] II. The purpose of setting the limiting part and the internal thread part on the grouting pipe in this utility model is to facilitate the fixing of the exhaust pipe and limit the exhaust pipe so that it can cooperate with the sealing structure to seal the drill hole and exhaust the air.
[0026] III. The sealing structure in this utility model is achieved by setting a sealing disc with an exhaust hole on the grouting pipe and setting an elastic sealing structure on the sealing disc. When the grouting pipe enters the borehole (at this time, the sealing structure is in its initial state), the sealing structure does not contact the borehole wall. When the grouting pipe reaches the designated position, the sealing disc is located at the top of the current grouting section. The exhaust pipe rotates downwards and squeezes the force ring, causing the ring to press down. When the ring presses down, the elastic sheet is squeezed outwards and squeezes the sealing pad to fit tightly against the borehole, thereby achieving the purpose of sealing the borehole. This ensures that the exhaust in this grouting section only enters the exhaust pipe through the exhaust hole, thus ensuring the accuracy of the gas sensor measurement and improving the grouting effect and continuous pipe pulling after grouting.
[0027] IV. In this utility model, grooves are provided on the sealing disc and the ring, a gasket is provided in the groove, and a screw hole is provided at the corresponding position of the groove, so as to facilitate the sealing gasket to be clamped in the groove. The bolt and the screw hole cooperate to apply force to the gasket, and the gasket applies force to the sealing gasket to fix the sealing gasket on the sealing disc and the ring, so as to ensure that the sealing gasket is not easy to fall off under force.
[0028] V. This utility model uses a telescopic flexible hose to seal and connect the exhaust hole on the sealing plate with the air inlet end of the exhaust pipe. This not only ensures that the gas in each grouting section can only be discharged through the exhaust pipe, but also ensures that the exhaust pipe can extend and retract when the thread moves up and down through the telescopic tube. Within the range of rotation and torsion, it can also meet the required exhaust requirements.
[0029] VI. The purpose of setting the sealing ring in this utility model is to further ensure the sealing effect between the telescopic hose, the sealing disc, and the exhaust pipe;
[0030] VII. This utility model clamps the force ring in the middle by setting an upper limit block and a lower limit block on the exhaust pipe, which makes it easy to push and pull the force ring so that the elastic sheet is squeezed outward or reset.
[0031] 8. The gas sensor in this utility model is a pressure sensor and / or a gas flow meter, so as to determine whether each grouting section is full or whether it can be pulled out by measuring whether the pressure and / or flow rate of the exhaust gas in the exhaust pipe is greater than a given value (judged by human observation data). Attached Figure Description
[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 This is a schematic diagram of the structure of this utility model;
[0034] Figure 2 for Figure 1 Partial cross-sectional view;
[0035] Figure 3 for Figure 2 Partial cross-sectional view;
[0036] Figure 4 This is a schematic diagram of the grouting pipe in this utility model;
[0037] Figure 5 This is a schematic diagram of the exhaust pipe structure in this utility model;
[0038] Figure 6 This is a schematic diagram of the elastic sealing structure in this utility model;
[0039] Figure 7 This is a schematic diagram of the structure in this utility model where the sealing gasket is disposed on the sealing disc and the ring;
[0040] Figure 8This is a schematic diagram of the unfolded structure of the exhaust pipe and the telescopic hose in this utility model;
[0041] In the diagram: 1-grouting pipe, 2-vent pipe, 3-gas sensor, 4-sealing structure, 5-limiting component, 6-internal threaded component, 7-connecting rod A, 8-limiting ring, 9-connecting rod B, 10-internal threaded ring, 11-external thread, 12-sealing disc, 13-elastic sealing structure, 14-vent hole, 15-ring, 16-elastic sheet, 17-sealing gasket, 18-force-bearing ring, 19-groove, 20-gasket, 21-screw hole, 22-threaded hole, 23-fixing hole, 24-mounting disc, 25-telescopic hose, 26-mounting hole, 27-connecting disc, 28-telescopic pipe body, 29-sealing ring, 30-upper limit block, 31-lower limit block. Detailed Implementation
[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0044] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0045] Furthermore, the terms "first," "second," and "third" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.
[0046] Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0047] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical 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.
[0048] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.
[0049] Example 1
[0050] To address the problem that existing technologies, which directly install pressure gauges on the grouting pipe for overall pressure monitoring, cannot distinguish the grouting conditions of different strata, thus easily leading to poor grouting effects and discontinuous pipe removal, thereby affecting construction efficiency, the following approach is needed. Figure 1-8 As shown, a pipe-pulling auxiliary device for grouting cover layers in water conservancy projects is provided. Its features include: an exhaust pipe 2 movably mounted on the grouting pipe 1 to exhaust gas from each grouting section during grouting; a gas sensor 3 mounted on the exhaust pipe 2 to sense whether gas is being emitted from each grouting section; and a sealing structure 4 mounted on the grouting pipe 1 and the exhaust pipe 2, which cooperates with the borehole seal to seal the grout outlet of the grouting pipe 1 within each grouting section requiring grouting. The sealing structure 4 has exhaust holes 14 corresponding to the sealing of the exhaust pipe 2. Initially, the sealing structure 4 is separated from the borehole, and the sealing structure 4 is engaged with the borehole seal by the force of the exhaust pipe 2. The inlet end of the exhaust pipe 2 is higher than the outlet end of the grouting pipe 1.
[0051] In practice, when grouting is required for the overburden layer (such as the overburden layer of surrounding rock) of a water conservancy project, drilling is performed first. After drilling, the grouting pipe 1, the vent pipe 2, and the sealing structure 4 are sent into the borehole. According to the principle of grouting from bottom to top, the outlet of the grouting pipe 1 is placed in the bottommost grouting section, while the sealing structure 4 is placed at the top of the bottommost grouting section. The sealing structure 4 is sealed with the borehole by the force of the vent pipe. After sealing, grout is injected into the bottommost grouting section through the grouting pipe. The gas inside will be discharged through the vent hole 14 and the vent pipe 2. When the gas is discharged, the gas sensor on the vent pipe can detect it. When the gas discharge detected by the gas sensor is greater than or equal to the given value (by manually observing the value on the gas sensor and comparing it with the given value obtained from actual experience), it indicates that the grouting is not full. When the grouting is full, the gas discharge detected by the gas sensor will be less than the given value. At this time, the construction personnel can know that the grouting is full, and then the pipe is pulled out to the next grouting section or the grouting is stopped to improve construction efficiency.
[0052] Example 2
[0053] Based on Embodiment 1, the grouting pipe 1 is provided with at least one limiting member 5 and an internal threaded member 6; the limiting member 5 includes a connecting rod A7 connected to the grouting pipe 1, and a limiting ring 8 disposed on the connecting rod A7; the internal threaded member 6 includes a connecting rod B9 connected to the grouting pipe 1, and an internal threaded ring 10 disposed on the connecting rod B9; the vent pipe 2 is provided with an external thread 11 that engages with the internal threaded ring 10, and the vent pipe 2 and the limiting ring 8 are in sliding and rotating engagement. The purpose of providing the limiting member and the internal threaded member on the grouting pipe is to facilitate the fixing of the vent pipe and to limit the vent pipe so that it can cooperate with the sealing structure to seal the drill hole and allow for venting.
[0054] The sealing structure 4 includes a sealing disc 12 disposed on the grouting pipe 1, an elastic sealing structure 13 disposed on the edge of the sealing disc 12, an exhaust hole 14 disposed on the sealing disc 12 corresponding to the exhaust pipe 2, and the diameter of the sealing disc 12 being smaller than the diameter of the drill hole; the elastic sealing structure 13 includes an annular ring 15, elastic sheets 16 uniformly disposed annularly on the outer edge of the sealing disc 12 and the annular ring 15, and a sealing gasket 17 disposed on the outer edge of the sealing disc 12 and the annular ring 15 and sleeved on the outside of the elastic sheets 16, the outer diameter of the annular ring 15 being smaller than the diameter of the sealing disc 12, and a force-bearing ring 18 cooperating with the exhaust pipe 2 disposed on the annular ring 15. The sealing structure uses a sealing disc with an vent hole on the grouting pipe, and an elastic sealing structure on the sealing disc. The vent pipe cooperates with the force ring in the elastic sealing structure to prevent the sealing structure from contacting the borehole wall when the grouting pipe enters the borehole (at this time, the sealing structure is in its initial state). When the grouting pipe reaches the designated position, the sealing disc is located at the top of the current grouting section. The downward spiral rotation of the vent pipe squeezes the force ring, causing the ring to press down. The ring presses down, and the elastic sheet is squeezed outward to compress the sealing gasket and make it fit tightly against the borehole, thus achieving the purpose of sealing the borehole. This ensures that the vent in this grouting section only enters the vent pipe through the vent hole, thereby ensuring the accuracy of the gas sensor measurement, improving the grouting effect, and facilitating continuous pipe pulling after grouting.
[0055] The exhaust pipe 2 is provided with an upper limit block 30 and a lower limit block 31 for pushing and pulling the force ring 18. By setting the upper limit block and the lower limit block on the exhaust pipe to sandwich the force ring in the middle, it is convenient to push and pull the force ring to make the elastic sheet be squeezed outward or to make the elastic sheet return to its original position.
[0056] In practice, when the sealing structure 4 moves to the top position of each grouting section, the exhaust pipe is rotated to engage with the internal threaded ring 10, causing the exhaust pipe to move downwards. The upper limit block 30 on the exhaust pipe 2 pushes the force-bearing ring 18. The force-bearing ring 18 transmits force to the ring 15 and the elastic plate 16. The elastic plate 16 is squeezed outwards and exerts force on the sealing gasket 17 (which can be an elastic rubber gasket) to press it against the borehole wall for sealing. After sealing, the current sealing can be performed. Conversely, when the exhaust pipe 2 engages with the internal threaded ring 10, the exhaust pipe moves upwards. The lower limit block 31 can pull the force-bearing ring 18 to reset the elastic plate 16, facilitating the removal of the pipe for grouting of the next grouting section.
[0057] Example 3
[0058] Based on Embodiment 2, a groove 19 for securing the sealing gasket 17 is provided on one side of the outer edge of the sealing disc 12 and the ring 15. A gasket 20 for pressing the sealing gasket 17 is provided in the groove 19. At the location of the groove 19, a screw hole 21 is provided on the ring 15 and the sealing disc 12, and a bolt for pressing the gasket 20 is provided in the screw hole 21. The grooves on the sealing disc and the ring, the gasket within the grooves, and the screw holes corresponding to the grooves facilitate securing the sealing gasket in the grooves. Force is applied to the gasket through the engagement of the bolts and screw holes, and further force is applied to the sealing gasket through the gasket, thus fixing the sealing gasket to the sealing disc and the ring, ensuring that the sealing gasket is not easily dislodged under pressure.
[0059] Example 4
[0060] Based on embodiment 3, a threaded hole 22 is provided on the sealing disc 12 located outside the vent hole 14; a mounting disc 24 with a fixing hole 23 is provided on the air inlet end of the vent pipe 2; the air inlet end of the vent pipe 2 is sealed to the vent hole 14 on the sealing disc 12 through a telescopic hose 25. The telescopic hose 25 includes two connecting discs 27 with mounting holes 26, and a telescopic tube body 28 connected to the connecting discs 27. One connecting disc 27 is connected to the threaded hole 22 on the sealing disc 12 by bolts, and the other connecting disc 27 is fixed by bolts and nuts through the mounting hole 26 and the fixing hole 23. By setting the telescopic hose to seal and connect the vent hole on the sealing disc to the air inlet end of the vent pipe, it is ensured that the gas in each grouting section can only be discharged through the vent pipe, and the telescopic tube body can also ensure that the vent pipe can extend and retract when the thread moves up and down, and can still achieve the required venting requirements within the range of rotation and torsion. Of course, in practice, if the sealing disc is thick enough, the vent pipe can be directly threaded and sealed to the vent hole on the sealing disc.
[0061] Example 5
[0062] Based on Example 4, the two connecting discs 27 are respectively sealed to the sealing disc 12 and the mounting disc 24 by sealing rings 29. The purpose of setting the sealing rings is to further ensure the sealing effect between the telescopic hose and the sealing disc and the exhaust pipe.
[0063] Example 6
[0064] Based on Example 5, the gas sensor 3 is a pressure sensor and / or a gas flow meter, so as to determine whether each grouting section is full or whether it can be pulled out by measuring whether the pressure and / or flow rate of the exhaust gas in the exhaust pipe is greater than a given value (judged by human observation data).
Claims
1. A pipe-pulling auxiliary device for grouting cover layer in water conservancy projects, characterized in that: The system includes an exhaust pipe (2) installed on the grouting pipe (1) to exhaust gas in each grouting section during grouting; a gas sensor (3) installed on the exhaust pipe (2) to sense whether gas is being discharged from each grouting section; and a sealing structure (4) installed on the grouting pipe (1) and the exhaust pipe (2) to seal the outlet of the grouting pipe (1) in each grouting section that needs grouting, in cooperation with the borehole seal. The sealing structure (4) is provided with an exhaust hole (14) corresponding to the seal of the exhaust pipe (2). The sealing structure (4) is separated from the borehole in the initial state, and the sealing structure (4) is in cooperation with the borehole seal by the force of the exhaust pipe (2).
2. The auxiliary device for pipe pulling in grouting of cover layer in water conservancy projects according to claim 1, characterized in that: At least one limiting component (5) and an internal thread component (6) are provided on the grouting pipe (1); The limiting component (5) includes a connecting rod A (7) connected to the grouting pipe (1) and a limiting ring (8) provided on the connecting rod A (7). The internal threaded component (6) includes a connecting rod B (9) connected to the grouting pipe (1) and an internal thread ring (10) disposed on the connecting rod B (9). The exhaust pipe (2) is provided with an external thread (11) that mates with the internal thread ring (10), and the exhaust pipe (2) is mates with the limiting ring (8) by sliding rotation.
3. The auxiliary device for pulling out pipes for grouting the cover layer in water conservancy projects according to claim 2, characterized in that: The sealing structure (4) includes a sealing disc (12) provided on the grouting pipe (1), an elastic sealing structure (13) provided on the edge of the sealing disc (12), and an exhaust hole (14) provided on the sealing disc (12) corresponding to the sealing of the exhaust pipe (2). The diameter of the sealing disc (12) is smaller than the diameter of the borehole. The elastic sealing structure (13) includes an annular ring (15), an elastic sheet (16) uniformly arranged on the outer edge of the sealing disc (12) and the annular ring (15), and a sealing gasket (17) arranged on the outer edge of the sealing disc (12) and the annular ring (15) and sleeved on the outer side of the elastic sheet (16). The outer diameter of the annular ring (15) is smaller than the diameter of the sealing disc (12). The annular ring (15) is also provided with a force-bearing ring (18) that cooperates with the exhaust pipe (2).
4. The auxiliary device for pulling out pipes for grouting the cover layer in water conservancy projects according to claim 3, characterized in that: The outer edge of the sealing disc (12) and the ring (15) is provided with a groove (19) for holding the sealing gasket (17). A gasket (20) for pressing the sealing gasket (17) is provided in the groove (19). At the position of the groove (19), the ring (15) and the sealing disc (12) are provided with screw holes (21), and bolts for pressing the gasket (20) are provided in the screw holes (21).
5. The auxiliary device for pipe pulling in grouting of cover layer in water conservancy projects according to claim 4, characterized in that: A threaded hole (22) is provided on the sealing disc (12) located outside the vent (14); Located at the air intake end of the exhaust pipe (2), the exhaust pipe (2) is provided with a mounting plate (24) with a fixing hole (23); The air inlet end of the exhaust pipe (2) is sealed to the exhaust hole (14) on the sealing plate (12) through the telescopic hose (25). The telescopic hose (25) includes two connecting plates (27) with mounting holes (26) and a telescopic tube body (28) connected to the connecting plates (27). One connecting plate (27) is connected to the threaded hole (22) on the sealing plate (12) by bolts, and the other connecting plate (27) is fixed by bolts and nuts through the mounting hole (26) and fixing hole (23).
6. The auxiliary device for pipe pulling in grouting of cover layer in water conservancy projects according to claim 5, characterized in that: The two connecting discs (27) are sealed and fitted with the sealing disc (12) and the mounting disc (24) respectively by the sealing ring (29).
7. The auxiliary device for pipe pulling in grouting of cover layer in water conservancy projects according to claim 3, characterized in that: The exhaust pipe (2) is provided with an upper limit block (30) and a lower limit block (31) for pushing and pulling the force ring (18).
8. The auxiliary device for pipe pulling in grouting of cover layer in water conservancy projects according to claim 1, characterized in that: The gas sensor (3) is a pressure sensor and / or a gas flow meter.