A dust-proof grouting structure inside an expansion pipe and an expansion pipe structure

Abstract

The present invention relates to a dust-proof grouting structure inside an expansion pipe and an expansion pipe structure. The dust-proof grouting structure inside the expansion pipe includes a dust-proof pipe. An axially penetrating first central hole is provided on the dust-proof pipe. The first end of the dust-proof pipe is used to communicate with the grouting output end. The second end of the dust-proof pipe is arranged to be openable and closable. A plurality of dust-proof holes penetrating radially along the dust-proof pipe are provided on the side wall of the dust-proof pipe. Each of the dust-proof holes is communicated with the first central hole. The dust-proof holes are used to filter debris in the grouting liquid flowing from the first central hole to the outside of the dust-proof pipe. A dust-proof cap is hermetically sleeved on the outer wall of the dust-proof pipe near the first end. The dust-proof cap is used for positioning the dust-proof pipe. In the present invention, a dust-proof pipe is provided, and the dust-proof holes on the dust-proof pipe can filter the grouting liquid, preventing debris in the grouting liquid from entering the expansion pipe body and ensuring the smooth advancement of the expansion cone in the expansion pipe body.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploitation, and particularly to a dust-proof grouting structure inside an expansion pipe and an expansion pipe structure. Background Art

[0002] In some production wells with a long oil production time, the casing often has holes, breakages, etc. due to long-term corrosion by various substances underground. This causes formation fluids to enter the wellbore, thereby affecting the well productivity. At this time, the expansion pipe technology needs to be used to repair the damaged casing.

[0003] The working principle of the expansion pipe is to drive an expansion cone to travel along the inner wall path of the expansion pipe through hydraulic or mechanical means, and increase the diameter of the expansion pipe by squeezing the inner wall of the expansion pipe. During the process of lowering the expansion pipe into the well, in order to ensure the pressure balance inside and outside the expansion pipe, a liquid needs to be poured into the expansion pipe body. In the prior art, the method adopted is to directly connect a rubber pipe to the wellhead and insert it into the expansion pipe for grouting after lowering the expansion pipe. During the grouting process, some sundries in the liquid enter the expansion pipe body together. If there are impurities in the liquid, these impurities will get stuck between the expansion cone and the inner wall of the pipe or deposit at the angle between the inner wall of the pipe and the expansion cone, thus blocking the travel path of the expansion cone, causing expansion jamming and unable to travel normally, and affecting the construction. Ensuring the cleanliness inside the expansion pipe during normal operation is a big problem.

[0004] Therefore, based on years of experience and practice in the relevant industry, the inventor of the present invention proposes a dust-proof grouting structure inside an expansion pipe and an expansion pipe structure to overcome the defects of the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a dust-proof grouting structure inside an expansion pipe and an expansion pipe structure, to overcome the problems such as affecting construction caused by debris deposition in the prior art. In the present invention, a dust-proof pipe is provided, and the dust-proof holes on the dust-proof pipe can filter the grouting liquid, preventing sundries in the grouting liquid from entering the expansion pipe body, and ensuring the smooth travel of the expansion cone inside the expansion pipe.

[0006] The purpose of the present invention is achieved as follows. A dust-proof grouting structure inside an expansion pipe includes a dust-proof pipe. An axially penetrating first central hole is provided on the dust-proof pipe. The first end of the dust-proof pipe is used to connect to the grouting output end. The second end of the dust-proof pipe is arranged to be openable and closable. A plurality of dust-proof holes penetrating radially along the side wall of the dust-proof pipe are provided, and each dust-proof hole is communicated with the first central hole. The dust-proof holes are used to filter sundries in the grouting liquid flowing from the first central hole to the outside of the dust-proof pipe. A dust-proof cap is hermetically sleeved on the outer wall of the dust-proof pipe near the first end, and the dust-proof cap is used for positioning the dust-proof pipe.

[0007] In a preferred embodiment of the present invention, a second central hole is axially penetrated through the dust cap. The second central hole is provided with a connecting groove hole with an increasing diameter from the bottom end inwards. The second central hole is used for passing through the dust-proof pipe, and the connecting groove hole is used for positioning and connecting.

[0008] In a preferred embodiment of the present invention, ventilation holes are provided on the dust cap radially outside the second central hole.

[0009] In a preferred embodiment of the present invention, a hollow dust-proof short joint is sleeved on the outer wall of the first end of the dust-proof pipe. The top end of the dust-proof short joint is connected with a hollow dust-proof union, and the dust-proof union can be communicated with the grouting output end.

[0010] In a preferred embodiment of the present invention, the second end of the dust-proof pipe is connected to the first end of a coupling. The second end of the coupling is detachably and sealingly sleeved with a plug, and the plug can close the second end of the dust-proof pipe.

[0011] The object of the present invention can also be achieved in this way. An expandable pipe structure includes an expandable pipe body with a closed bottom end. An expandable cone that can slide axially is sleeved inside the expandable pipe body. The outer side wall of the expandable cone can slide and abut against the inner wall of the expandable pipe body. The outer side wall of the expandable cone can squeeze the inner wall of the expandable pipe body to increase its diameter. An expandable pipe inner dust-proof grouting structure or an expandable central pipe as described above is detachably arranged inside the expandable pipe body, and the bottom end of the expandable central pipe can pass through the expandable cone.

[0012] In a preferred embodiment of the present invention, the expandable pipe inner dust-proof grouting structure includes a dust-proof pipe. There is a radial gap between the outer wall of the dust-proof pipe and the inner wall of the expandable pipe body. The dust-proof pipe is provided with a first central hole axially penetrated through it. The first end of the dust-proof pipe is used for communicating with the grouting output end. The second end of the dust-proof pipe is arranged to be openable and closable. A plurality of dust-proof holes radially penetrating through the side wall of the dust-proof pipe are provided, and each dust-proof hole is communicated with the first central hole. The dust-proof holes are used for filtering sundries in the grouting liquid flowing from the first central hole to the outside of the dust-proof pipe. A dust cap is sealingly sleeved on the outer wall of the dust-proof pipe near the first end, and the dust cap can be buckled on the top end of the expandable pipe body to position and connect the dust-proof pipe inside the expandable pipe body.

[0013] In a preferred embodiment of the present invention, a second central hole is axially penetrated through the dust cap. The second central hole is provided with a connecting groove hole with an increasing diameter from the bottom end inwards. The second central hole is used for passing through the dust-proof pipe, and the connecting groove hole is used for positioning and connecting; ventilation holes are provided on the dust cap radially outside the second central hole.

[0014] In a preferred embodiment of the present invention, a hollow dust-proof nipple is sleeved on the outer wall of the first end of the dust-proof pipe, and a hollow dust-proof union is connected to the top end of the dust-proof nipple, and the dust-proof union can be communicated with the grouting output end.

[0015] In a preferred embodiment of the present invention, the second end of the dust-proof pipe is connected to the first end of a coupling, and the second end of the coupling is detachably and sealingly sleeved with a plug, and the plug can close the second end of the dust-proof pipe.

[0016] As described above, the dust-proof grouting structure and the expansion pipe structure provided by the present invention have the following beneficial effects:

[0017] In a dust-proof grouting structure in an expansion pipe provided by the present invention, the grouting liquid flows from the first central hole of the dust-proof pipe and the dust-proof holes on the side wall to the outside of the dust-proof pipe. The dust-proof holes allow the grouting liquid to flow through and can intercept sundries in the first central hole of the dust-proof pipe, playing a filtering role and maximizing the cleanliness of the grouting liquid; the dust-proof cap realizes the positioning of the dust-proof pipe; and, the second end of the dust-proof pipe can be closed and opened, facilitating the cleaning and maintenance inside the dust-proof pipe; the dust-proof grouting structure in an expansion pipe provided by the present invention has a low manufacturing cost and can be reused, which is conducive to popularization and use; in a dust-proof grouting structure in an expansion pipe provided by the present invention, a dust-proof cap provided with a ventilation hole enables the dust-proof grouting structure in the expansion pipe to have a ventilation function, maximizing the grouting speed of the grouting liquid;

[0018] In the expansion pipe structure provided by the present invention, when grouting, the dust-proof grouting structure in the expansion pipe is adopted. The grouting liquid flows from the first central hole of the dust-proof pipe and the dust-proof holes on the side wall to the outside of the dust-proof pipe. The dust-proof holes allow the grouting liquid to flow through and can intercept sundries in the first central hole of the dust-proof pipe, playing a filtering role and maximizing the cleanliness of the grouting liquid; the ventilation hole is provided on the dust-proof cap, enabling the dust-proof grouting structure in the expansion pipe to have a ventilation function, maximizing the grouting speed of the grouting liquid; the grouting liquid enters the expansion pipe body after being filtered, ensuring the cleanliness between the expansion cone and the inner wall of the expansion pipe body, and the traveling route of the expansion cone is unobstructed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention.

[0020] Wherein:

[0021] Figure 1 : is a cross-sectional view of the dust-proof grouting structure in the expansion pipe of the present invention.

[0022] Figure 2 : is an external view of the dust-proof grouting structure in the expansion pipe of the present invention.

[0023] Figure 3: Schematic diagram when grouting liquid passes through the dust-proof grouting structure in the expansion pipe of the present invention.

[0024] Figure 4 : Schematic diagram of exhaust of the dust-proof grouting structure in the expansion pipe of the present invention during the grouting process.

[0025] Figure 5 : Schematic diagram of the grouting process of the expansion pipe structure of the present invention.

[0026] Figure 6 : Schematic diagram of the expansion operation process of the expansion pipe structure of the present invention.

[0027] Figure 7 : Schematic diagram of the expansion operation process of the expansion pipe in the prior art.

[0028] In the figure:

[0029] 100. Dust-proof grouting structure in the expansion pipe;

[0030] 200. Expansion pipe structure;

[0031] 1. Dust-proof pipe;

[0032] 10. First central hole; 11. Dust-proof hole;

[0033] 2. Dust-proof cap;

[0034] 20. Second central hole; 21. Connecting groove hole; 22. Vent hole;

[0035] 3. Dust-proof short joint;

[0036] 4. Dust-proof union;

[0037] 5. Coupling;

[0038] 6. Plug;

[0039] 7. Expansion pipe body; 71. Expansion central pipe; 72. Deposited debris;

[0040] 8. Expansion cone;

[0041] 91. Grouting output end; 92. Wellhead. Detailed implementation manners

[0042] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention are now described with reference to the accompanying drawings.

[0043] The specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and should not be construed in any way as a limitation of the present invention. Under the teaching of the present invention, those skilled in the art can conceive any possible variations based on the present invention, and all of these should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0045] As Figure 1 、 Figure 2 shown, the present invention provides a dust-proof grouting structure 100 inside an expansion pipe, including a dust-proof pipe 1. An axially penetrating first central hole 10 is provided on the dust-proof pipe 1. The first end ( Figure 1 the top end in Figure 1 the bottom end in

[0046] of the dust-proof pipe 1) is used to communicate with the grouting output end 91. The second end (

[0046] the bottom end in Figure 1 the top end in Figure 1 of the dust-proof pipe 1) is arranged to be openable and closable. A plurality of dust-proof holes 11 penetrating radially along the side wall of the dust-proof pipe 1 are provided. Each dust-proof hole 11 is communicated with the first central hole 10. The dust-proof holes 11 are used to filter impurities in the grouting liquid flowing from the first central hole 10 to the outside of the dust-proof pipe 1. The grouting liquid flows to the outside of the dust-proof pipe through the first central hole 10 and the dust-proof holes 11 on the side wall of the dust-proof pipe 1. The dust-proof holes 11 allow the grouting liquid to flow through and can intercept the impurities in the first central hole 10 of the dust-proof pipe, playing a filtering role and maximizing the cleanliness of the grouting liquid. A dust-proof cap 2 is hermetically sleeved on the outer wall of the dust-proof pipe 1 near the first end, and the dust-proof cap 2 is used for positioning the dust-proof pipe 1.In a specific embodiment of the present invention, 84 dust-proof holes 11 are provided on the side wall of the dust-proof pipe 1. The aperture size of the dust-proof holes 11 is 6 mm, and the aperture and quantity of the dust-proof holes 11 are determined according to actual requirements. During the grouting process, the dust-proof holes 11 effectively prevent inclusions in the grouting liquid from entering the expansion pipe body, ensuring the cleanliness of the liquid in the expansion pipe body, which plays a crucial role in the subsequent expansion work of the expansion pipe.

[0047] A dust-proof grouting structure inside an expansion pipe provided by the present invention is used to inject grouting liquid into the expansion pipe to ensure the pressure balance inside and outside the expansion pipe; the grouting liquid flows to the outside of the dust-proof pipe through the first central hole and the dust-proof holes on the side wall of the dust-proof pipe and reaches above the expansion cone. The dust-proof holes allow the grouting liquid to flow through and can intercept impurities in the first central hole of the dust-proof pipe, playing a filtering role and maximizing the cleanliness of the grouting liquid; the dust-proof cap realizes the positioning of the dust-proof pipe; and the second end of the dust-proof pipe can be closed and opened, facilitating the cleaning and maintenance inside the dust-proof pipe; the dust-proof grouting structure inside an expansion pipe provided by the present invention has a low manufacturing cost and can be reused, which is conducive to popularization and use.

[0048] Furthermore, as Figure 1 shown, a second central hole 20 is axially provided through the dust-proof cap 2. The second central hole 20 is provided with a connecting groove hole 21 with an increasing diameter from the bottom end inward. The second central hole 20 is used to pass through the dust-proof pipe 1, and the connecting groove hole 21 is used for positioning and connection. The top end of the expansion pipe body is sleeved in the connecting groove hole 21, and the dust-proof cap 2 realizes the positioning of the dust-proof pipe 1 inside the expansion pipe body.

[0049] Furthermore, as Figure 1 shown, ventilation holes 22 are provided on the radial outer side of the second central hole 20 on the dust-proof cap 2. The number of ventilation holes 22 is multiple, and the specific number is determined according to actual production. As Figure 4 shown, during the grouting process, the gas in the expansion pipe body can be discharged through the ventilation holes 22 in the dust-proof cap 2, avoiding the blockage of the grouting liquid flow caused by the gas being unable to be discharged in the expansion pipe body and resulting in pressure build-up. The dust-proof cap provided with ventilation holes 22 enables the dust-proof grouting structure inside the expansion pipe to have a ventilation function, maximizing the grouting speed of the grouting liquid.

[0050] Furthermore, as Figure 1 、 Figure 2 shown, a hollow dust-proof short joint 3 is sleeved on the outer wall of the first end of the dust-proof pipe 1. The top end of the dust-proof short joint 3 is connected with a hollow dust-proof union 4, and the dust-proof union 4 can be communicated with the grouting output end 91.

[0051] Furthermore, as Figure 1 、 Figure 2As shown, the second end of the dust-proof pipe 1 is connected to the first end of a coupling 5. The second end of the coupling 5 is detachably and sealingly sleeved with a plug 6, and the plug 6 can close the second end of the dust-proof pipe 1. When cleaning is required, the plug 6 at the second end of the dust-proof pipe 1 is removed from the coupling 5, the internal debris of the dust-proof pipe 1 is poured out and cleaned, and then the plug 6 is installed for reuse.

[0052] As Figure 3 , Figure 4 , Figure 5 , Figure 6 shown, the present invention also provides an expansion pipe structure 200, which includes an expansion pipe body 7 with a closed bottom end. In the working state, the expansion pipe body 7 is fixedly connected to the wellhead 92; an expansion cone 8 that can slide axially is sleeved inside the expansion pipe body 7. The outer side wall of the expansion cone 8 can slide and abut against the inner wall of the expansion pipe body 7. The outer side wall of the expansion cone 8 can squeeze the inner wall of the expansion pipe body 7 to increase its diameter. The expansion and repair effect of the expansion cone 8 is achieved by its upward extrusion of the inner wall of the expansion pipe body 7; an expansion pipe internal dust-proof grouting structure 100 or an expansion center pipe 71 as described above is detachably arranged inside the expansion pipe body 7. The bottom end of the expansion center pipe 71 can penetrate through the expansion cone 8. During the expansion operation, expansion operation liquid is injected downward of the expansion cone 8 through the expansion center pipe 71, and the expansion cone 8 moves upward under the pushing action of the expansion operation liquid (prior art).

[0053] As Figure 3 shown, when the expansion pipe structure 200 needs to be grouted, the expansion pipe internal dust-proof grouting structure 100 is inserted into the expansion pipe body 7 and its upper connection is tightened. At this time, the expansion center pipe 71 is located outside the expansion pipe body 7; after the grouting is completed, the connection is released and the expansion pipe internal dust-proof grouting structure 100 is taken out. The expansion center pipe 71 is lowered into the expansion pipe body 7, and the bottom end of the expansion center pipe 71 penetrates through the expansion cone 8 to ensure that the expansion center pipe 71 is communicated with the lower part of the expansion cone 8 inside the expansion pipe body 7.

[0054] Further, as Figure 1 , Figure 2 shown, the expansion pipe internal dust-proof grouting structure 100 includes a dust-proof pipe 1. There is a radial interval between the outer wall of the dust-proof pipe 1 and the inner wall of the expansion pipe body 7. An axially penetrating first central hole 10 is provided on the dust-proof pipe 1. The first end of the dust-proof pipe 1 is used to communicate with the grouting output end 91. The second end of the dust-proof pipe 1 is arranged to be openable and closable. A plurality of dust-proof holes 11 that penetrate radially along the dust-proof pipe 1 are provided on the side wall of the dust-proof pipe 1. Each dust-proof hole 11 is communicated with the first central hole 10. The dust-proof holes 11 are used to filter debris in the grouting liquid flowing from the first central hole 10 to the outside of the dust-proof pipe; a dust-proof cap 2 is sealingly sleeved on the outer wall of the dust-proof pipe 1 near the first end. The dust-proof cap 2 can be buckled on the top end of the expansion pipe body 7 to position and connect the dust-proof pipe 1 inside the expansion pipe body 7.

[0055] Further, asFigure 1 , Figure 2 As shown in Figure 2 , a second central hole 20 is axially formed through the dust cap 2. The second central hole 20 is provided with a connecting groove hole 21 with an increasing diameter from the bottom end inward. The second central hole 20 is used for passing through the dust-proof pipe 1, and the connecting groove hole 21 is used for positioning and connecting. The top end of the expansion tube body is sleeved in the connecting groove hole 21, and the dust cap 2 realizes the positioning of the dust-proof pipe 1 in the expansion tube body 7. A ventilation hole 22 is provided on the dust cap 2 at the radially outer side of the second central hole 20. The number of the ventilation holes 22 is multiple, and the specific number is determined according to actual production. As Figure 4 shown in Figure 4 , during the grouting process, the gas in the expansion tube body can be discharged through the ventilation holes 22 in the dust cap 2, avoiding the pressure build-up caused by the inability to discharge the gas in the expansion tube body 7 and hindering the flow of the grouting liquid. The dust cap provided with the ventilation holes 22 enables the dust-proof grouting structure in the expansion tube to have a ventilation function, maximizing the grouting speed of the grouting liquid.

[0056] Furthermore, as Figure 1 , Figure 2 shown in Figure 2 , a hollow dust-proof short joint 3 is sleeved on the outer wall of the first end of the dust-proof pipe 1, and a hollow dust-proof union 4 is connected to the top end of the dust-proof short joint 3. The dust-proof union 4 can be communicated with the grouting output end 91.

[0057] Furthermore, as Figure 1 , Figure 2 shown in Figure 2 , the second end of the dust-proof pipe 1 is connected to the first end of a coupling 5. The second end of the coupling 5 is detachably and sealingly sleeved with a plug 6, and the plug 6 can seal the second end of the dust-proof pipe 1. When cleaning is required after grouting, the plug 6 at the second end of the dust-proof pipe 1 is removed from the coupling 5 by unthreading, the internal debris of the dust-proof pipe 1 is poured out, and a large amount of clean water is poured into the dust-proof pipe 1 from the dust-proof union 4 for cleaning. After cleaning, the plug 6 is installed in the coupling 5, and it can be reused.

[0058] The usage method of the expansion tube structure 200 of the present invention is as follows:

[0059] First, the expansion cone 8 is sleeved in the expansion center tube 71, and the expansion tube body 7 is lowered into the well. To balance the pressure inside and outside the expansion tube body 7, grouting operation needs to be carried out on its interior;

[0060] Before grouting, the dust-proof union 4, dust-proof short joint 3, dust cap 2, dust-proof pipe 1, coupling 5 and plug 6 of the dust-proof grouting structure 100 in the expansion tube are sequentially connected by threads; the dust-proof grouting structure 100 in the expansion tube is inserted into the expansion tube body 7, and the dust cap 2 is screwed and tightened with the expansion tube body 7; the grouting output end 91 is connected to the dust-proof union 4, and continuous grouting is carried out;

[0061] As Figure 3As shown in the figure, the grouting liquid flows into the expansion tube body 7 through the grouting output end 91, the first central hole 10 of the dust-proof pipe 1, and the dust-proof holes 11 on the side wall. The dust-proof holes 11 allow the grouting liquid to flow through and can intercept sundries in the first central hole 10 of the dust-proof pipe, ensuring the cleanliness of the grouting liquid in the expansion tube body 7, which plays a key role in the subsequent expansion work of the expansion tube;

[0062] As Figure 4 shown in the figure, during the grouting process, the gas in the expansion tube body 7 is discharged through the ventilation holes 22 in the dust-proof cap 2, enabling the dust-proof grouting structure 100 in the expansion tube to have a ventilation function and maximizing the grouting speed of the grouting liquid.

[0063] As Figure 5 shown in the figure, the filtered grouting liquid enters the expansion tube body 7 to balance the pressure; there are no sundries in the grouting liquid, ensuring the cleanliness between the upper part of the expansion cone 8 and the inner wall of the expansion tube body 7, and the advancing route of the upward movement of the expansion cone 8 is unobstructed. In the prior art, as Figure 7 shown in the figure, sedimentary sundries 72 are deposited between the expansion cone 8 and the inner wall of the expansion tube body 7, affecting the normal advancement of the expansion cone 8.

[0064] After the grouting is completed, disconnect the connection between the grouting output end 91 and the dust-proof union 4, and then uncouple the dust-proof cap 2 from the expansion tube body 7 to remove the entire set of devices.

[0065] As Figure 6 shown in the figure, lower the expansion center tube 71 into the expansion tube body 7. The bottom end of the expansion center tube 71 passes through the expansion cone 8 to ensure that the expansion center tube 71 is connected to the lower part of the expansion cone 8 inside the expansion tube body 7; inject the expansion operation liquid into the expansion center tube 71. The expansion operation liquid flows to the lower part of the expansion cone 8 and pushes the expansion cone 8 upward to squeeze the inner wall of the expansion tube body 7 to complete the expansion and repair function of the expansion tube structure 200.

[0066] In the expansion tube structure provided by the present invention, during grouting, the dust-proof grouting structure in the expansion tube is adopted. The grouting liquid flows to the outside of the dust-proof pipe through the first central hole of the dust-proof pipe and the dust-proof holes on the side wall. The dust-proof holes allow the grouting liquid to flow through and can intercept sundries in the first central hole of the dust-proof pipe, playing a filtering role and maximizing the cleanliness of the grouting liquid; ventilation holes are provided on the dust-proof cap, enabling the dust-proof grouting structure in the expansion tube to have a ventilation function and maximizing the grouting speed of the grouting liquid; the grouting liquid enters the expansion tube body after filtration, ensuring the cleanliness between the expansion cone and the inner wall of the expansion tube body, and the advancing route of the expansion cone is unobstructed.

[0067] As described above, the dust-proof grouting structure in the expansion tube and the expansion tube structure provided by the present invention have the following beneficial effects:

[0068] In a dust-proof grouting structure inside an expansion pipe provided by the present invention, grouting liquid flows to the outside of the dust-proof pipe through the first central hole of the dust-proof pipe and the dust-proof holes on the side wall. The dust-proof holes allow the grouting liquid to flow through and can intercept sundries in the first central hole of the dust-proof pipe, playing a filtering role and maximizing the cleanliness of the grouting liquid; the dust-proof cap realizes the positioning of the dust-proof pipe; moreover, the second end of the dust-proof pipe can be closed and opened, facilitating the cleaning and maintenance inside the dust-proof pipe; the dust-proof grouting structure inside the expansion pipe provided by the present invention has a low manufacturing cost and can be reused, which is conducive to popularization and use; in the dust-proof grouting structure inside the expansion pipe provided by the present invention, a dust-proof cap provided with a ventilation hole enables the dust-proof grouting structure inside the expansion pipe to have a ventilation function, maximizing the grouting speed of the grouting liquid;

[0069] In the expansion pipe structure provided by the present invention, when grouting, the dust-proof grouting structure inside the expansion pipe is adopted. The grouting liquid flows to the outside of the dust-proof pipe through the first central hole of the dust-proof pipe and the dust-proof holes on the side wall. The dust-proof holes allow the grouting liquid to flow through and can intercept sundries in the first central hole of the dust-proof pipe, playing a filtering role and maximizing the cleanliness of the grouting liquid; a ventilation hole is provided on the dust-proof cap, enabling the dust-proof grouting structure inside the expansion pipe to have a ventilation function and maximizing the grouting speed of the grouting liquid; the grouting liquid enters the expansion pipe body after filtration, ensuring the cleanliness between the expansion cone and the inner wall of the expansion pipe body and making the traveling route of the expansion cone unobstructed.

[0070] The above are only illustrative specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A dust-proof grouting structure inside an expansion pipe, characterized in that It includes a dust-proof pipe. An axially penetrating first central hole is provided on the dust-proof pipe. The first end of the dust-proof pipe is used to communicate with the grouting output end. The second end of the dust-proof pipe is arranged to be openable and closable. A plurality of dust-proof holes penetrating radially along the dust-proof pipe are provided on the side wall of the dust-proof pipe. Each dust-proof hole is communicated with the first central hole. The dust-proof holes are used to filter debris in the grouting liquid flowing from the first central hole to the outside of the dust-proof pipe. A dust-proof cap is hermetically sleeved on the outer wall of the dust-proof pipe near the first end. The dust-proof cap is used for positioning the dust-proof pipe. A second central hole is axially penetratingly provided on the dust-proof cap. A connecting groove hole with an increasing diameter is provided inwards from the bottom end in the second central hole. The second central hole is used to penetrate the dust-proof pipe. The connecting groove hole is used for positioning and connection. An air vent hole is provided on the dust-proof cap at the radially outer side of the second central hole. A hollow dust-proof short joint is sleeved on the outer wall of the first end of the dust-proof pipe. A hollow dust-proof union is connected to the top end of the dust-proof short joint. The dust-proof union can be communicated with the grouting output end. The second end of the dust-proof pipe is connected to the first end of a coupling. A plug is detachably and hermetically sleeved on the second end of the coupling. The plug can close the second end of the dust-proof pipe.

2. An expansion tube structure, characterized in that, It includes an expansion tube body with a closed bottom end. An expandable cone that can slide axially is sleeved in the expansion tube body. The outer side wall of the expandable cone can slide and abut against the inner wall of the expansion tube body. The outer side wall of the expandable cone can squeeze the inner wall of the expansion tube body to increase its diameter. An anti-dust grouting structure in the expansion tube as described in claim 1 is detachably arranged in the expansion tube body. A radial interval is provided between the outer wall of the dust-proof pipe and the inner wall of the expansion tube body. The dust-proof cap can be buckled on the top end of the expansion tube body to position and connect the dust-proof pipe in the expansion tube body.

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