Foundation pit retaining structure anti-seepage leak-proof pre-burying device and installation method thereof

Abstract

The present application relates to a kind of foundation pit retaining structure anti-leakage post-embedded device and its installation method, the installation method includes the following steps: before construction internal structure, at the leakage area of foundation pit retaining structure, setting drainage hose;When binding internal structure reinforcement, hollow hard tube is set, so that the hollow hard tube is set outside the drainage hose;When pouring internal structure, the hollow hard tube is poured together with the internal structure;After the concrete maintenance of internal structure ends, sealing material is injected into the leakage area and the drainage hose through the drainage hose, and then sealing material is injected between the drainage hose and the hollow hard tube through the hollow hard tube, until the hollow hard tube is filled and connected after being filled dense sealing piece.The present application solves the problems of poor internal structure concrete pouring quality, long-term leakage and steel corrosion caused by the inability of foundation pit retaining structure to effectively seal the leakage area.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of foundation pit construction, in particular to a post-embedded device for preventing seepage and leakage of a foundation pit retaining structure and a method for installing the same. BACKGROUND

[0002] The problem of seepage of a retaining structure is a common quality defect in foundation pit projects. Currently, there are mainly two methods for plugging the seepage points of a retaining structure: one is to groove and pipe and then press-in and plug the material for plugging; and the other is to press-in and plug the material for plugging into the seepage points with the help of a drainage pipe.

[0003] Both of the above-mentioned plugging methods are to plug after the construction of the retaining structure and before the construction of the internal structure. However, for the case of strong water seepage pressure, effective plugging cannot be achieved, and new seepage points may occur at other positions of the retaining structure. If the new seepage points occur during the pouring stage of the internal structure, the pouring quality of the internal structure will be poor, and the specific seepage points will be covered and cannot be plugged again due to the pouring of the internal structure, resulting in long-term seepage and reinforcement corrosion of the internal structure during the use stage, which affects the use function and service life of the internal structure. SUMMARY

[0004] In order to solve the above-mentioned problems, the present application provides a post-embedded device for preventing seepage and leakage of a foundation pit retaining structure and a method for installing the same, which solves the problems of poor pouring quality of the internal structure, long-term seepage, and reinforcement corrosion caused by the ineffective plugging of the seepage of the foundation pit retaining structure.

[0005] The present application is realized by the following scheme: a post-embedded device for preventing seepage and leakage of a foundation pit retaining structure, comprising:

[0006] a drainage hose arranged at a seepage area of the foundation pit retaining structure, the drainage hose comprising a first end for being inserted into the foundation pit retaining structure and covering the seepage area, and a second end for extending into the foundation pit and extending to a position to be constructed of an internal structure;

[0007] a hollow hard pipe sleeved on the outer periphery of the drainage hose and used for being embedded in the internal structure;

[0008] a plugging material used for being press-in at the seepage area, in the drainage hose, and between the drainage hose and the hollow hard pipe;

[0009] a plugging member detachably connected to the hollow hard pipe and used for preventing the plugging material from flowing out.

[0010] Further improvement of the post-pre-burying device for preventing seepage and leakage of the foundation pit enclosure structure is that the hollow hard pipe comprises a main pipe section located in the inner structure, and an extension pipe section for connecting the main pipe section and the inner side template of the inner structure, the extension pipe section comprises a first end detachably butted to the main pipe section and a second end for penetrating out of the inner side template, the blocking member is detachably connected to the butted end of the main pipe section, and the blocking member is located in the inner structure in the state of being connected to the main pipe section.

[0011] Further improvement of the post-pre-burying device for preventing seepage and leakage of the foundation pit enclosure structure is that a cup structure is connected to the outer periphery of the butted end of the main pipe section, the blocking member is located in the cup structure in the state of being connected to the main pipe section, and the cup structure is filled with plastering mortar for being flush with the inner side of the inner structure.

[0012] Further improvement of the post-pre-burying device for preventing seepage and leakage of the foundation pit enclosure structure is that the main pipe section comprises a steel pipe and a first end cap nut detachably fixed to one end of the steel pipe, the extension pipe section is a second end cap nut, and the blocking member comprises an end cap bolt matched with the first end cap nut.

[0013] Further improvement of the post-pre-burying device for preventing seepage and leakage of the foundation pit enclosure structure is that at least one water stop plate is fixed to the outer periphery of the main pipe section.

[0014] Further improvement of the post-pre-burying device for preventing seepage and leakage of the foundation pit enclosure structure is that a reinforcing table is sealingly fixed between the drainage hose and the foundation pit enclosure structure, and the outer diameter of the reinforcing table is not greater than the inner diameter of the hollow hard pipe.

[0015] The application further provides a mounting method of the post-pre-burying device for preventing seepage and leakage of the foundation pit enclosure structure, comprising the following steps:

[0016] Before the inner structure is constructed, a drainage hose is arranged at a seepage area of the foundation pit enclosure structure;

[0017] When the steel reinforcement of the inner structure is bound, the hollow hard pipe is arranged to be sleeved outside the drainage hose;

[0018] When the inner structure is poured, the hollow hard pipe is poured together with the inner structure;

[0019] After the concrete maintenance of the inner structure is completed, the blocking material is injected into the seepage area and the drainage hose through the drainage hose, and then the blocking material is injected into the drainage hose and the hollow hard pipe through the hollow hard pipe until the hollow hard pipe is filled and connected with the blocking member.

[0020] Further improvement of the installation method of the anti-seepage and anti-leakage post-pre-burying device for the foundation pit enclosure structure of the present application is that:

[0021] The hollow hard pipe comprises a main pipe section and an extension pipe section;

[0022] When the hollow hard pipe is arranged, the first end of the extension pipe section is connected to the main pipe section in butt joint, and then they are both sleeved outside the drainage hose, and the main pipe section is abutted to the foundation pit enclosure structure;

[0023] Before pouring the internal structure, the inner side formwork of the internal structure is first erected, and a hole is formed on the inner side formwork, and the second end of the extension pipe section is penetrated out through the hole;

[0024] After the concrete curing of the internal structure is completed and before the pressure injection of the sealing material, the inner side formwork and the extension pipe section are removed;

[0025] After the pressure injection of the sealing material is completed and before the connection of the sealing piece, the part of the drainage hose extending out of the main pipe section is cut off, and then the sealing piece is connected to the butt joint end of the main pipe section.

[0026] Further improvement of the installation method of the anti-seepage and anti-leakage post-pre-burying device for the foundation pit enclosure structure of the present application is that:

[0027] The butt joint end of the main pipe section is surrounded by a cup structure;

[0028] When the second end of the extension pipe section is penetrated out through the hole, the cup structure is abutted to the inner side formwork;

[0029] After the sealing piece is connected to the butt joint end of the main pipe section, the plastering mortar is filled in the cup structure, so that the plastering mortar covers the sealing piece and is flush with the inner side of the internal structure.

[0030] Further improvement of the installation method of the anti-seepage and anti-leakage post-pre-burying device for the foundation pit enclosure structure of the present application is that, after the sealing piece is connected to the butt joint end of the main pipe section, it is observed whether there is no seepage at the sealing piece for a period of time, and if so, the plastering mortar is filled in the cup structure.

[0031] The application adopts the way of post-blocking to block the leakage area of the foundation pit enclosure structure, and uses the drainage hose to collect and drain the leakage water outside the internal structure during the construction of the internal structure, so as to ensure the internal structure concrete pouring quality and avoid long-term leakage and steel corrosion and other problems. Through the hollow hard pipe sleeving the drainage hose and cooperating with the blocking material, blocking piece and water stop plate and other measures, the reliable blocking of the leakage area of the foundation pit enclosure structure is ensured, and the self-waterproof performance of the internal structure is ensured, and secondary water leakage is avoided. In addition, through the cooperation of the extension pipe section, cup opening structure and troweling mortar, the smoothness and beauty of the surface of the internal structure are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A cross-sectional schematic view of the installation stage of the post-embedded device of the application is shown.

[0033] Figure 2 A cross-sectional schematic view of the use stage of the post-embedded device of the application is shown.

[0034] Figure 3 An enlarged schematic view of A in Figure 1 DETAILED DESCRIPTION

[0035] In order to solve the problems of poor internal structure concrete pouring quality, long-term leakage and steel corrosion caused by the ineffective blocking of the leakage of the foundation pit enclosure structure, the application provides a post-embedded device for preventing seepage and leakage of a foundation pit enclosure structure and a mounting method thereof, which will be further described below in combination with specific embodiments and drawings.

[0036] Referring to Figures 1 to 3 A post-embedded device for preventing seepage and leakage of a foundation pit enclosure structure, as shown in the drawings, comprises: a drainage hose 3 arranged at a leakage area 11 of the foundation pit enclosure structure 1, the drainage hose 3 comprising a first end for being inserted into the foundation pit enclosure structure 1 and covering the leakage area 11, and a second end for extending into the foundation pit and extending out of a to-be-constructed position of an internal structure 2 (usually referring to an inner lining wall constructed next to the foundation pit enclosure structure); a hollow hard pipe 4 sleeved on the outer periphery of the drainage hose 3 and used for being embedded in the internal structure 2; a blocking material 5 used for being injected in the leakage area 11, the drainage hose 3 and between the drainage hose 3 and the hollow hard pipe 4, and preferably made of polyurethane material; and a blocking piece detachably connected to the hollow hard pipe 4 and used for preventing the blocking material 5 from flowing out.

[0037] In this embodiment, a reinforcing table 31 (such as Figure 3 ​As shown in the drawing), the reinforcing platform 31 can be applied to the root of the drainage hose 3 (close to the first end) by cement mortar to seal the gap between the drainage hose 3 and the foundation pit support structure 1, the reinforcing platform 31 is a conical barrel, the maximum outer diameter is not greater than the inner diameter of the hollow hard tube 4, so that the hollow hard tube 4 is sleeved on the drainage hose 3, and the reinforcing platform 31 is located in the hollow hard tube 4.

[0038] Regarding the installation method of the above-mentioned foundation pit support structure anti-seepage and leakage pre-embedded device, comprising the steps of:

[0039] Step 1, before the construction of the internal structure 2, the drainage hose 3 is arranged at the leakage area 11 of the foundation pit support structure 1. Specifically, during the excavation stage of the foundation pit, as the excavation process proceeds, a drainage hose 3 is arranged at a leakage area to ensure the concentration of seepage water and the quality of excavation. Steps 2 to 4 are performed during the construction of the internal structure 2.

[0040] Step 2, when the internal structure 2 steel is tied, the hollow hard tube 4 is arranged so that the hollow hard tube 4 is sleeved on the drainage hose 3. Specifically, one end of the hollow hard tube 4 is abutted to the foundation pit support structure 1, and the other end extends out of the internal structure 2 to be constructed along with the drainage hose 3.

[0041] Step 3, when pouring the internal structure 2, the hollow hard tube 4 is poured together with the internal structure 2.

[0042] Step 4, after the concrete curing of the internal structure 2 is completed, the sealing material 5 is injected into the leakage area 11 and the drainage hose 3 through the drainage hose 3, and then the sealing material 5 is injected into the drainage hose 3 and the hollow hard tube 4 through the hollow hard tube 4, until the hollow hard tube 4 is filled and connected with the sealing member.

[0043] The present application adopts a post-sealing method to seal the leakage area of the foundation pit support structure, and utilizes the drainage hose to concentrate and drain the seepage water outside the internal structure during the construction of the internal structure, which ensures the quality of the internal structure concrete pouring and avoids long-term leakage and steel corrosion and other problems. In addition, by sleeving the drainage hose with the hollow hard tube and cooperating with the sealing material, sealing member and other measures, the reliable sealing of the leakage area of the foundation pit support structure is ensured, and the self-waterproof performance of the internal structure is ensured, avoiding secondary water seepage.

[0044] To prevent the hollow rigid pipe from protruding from the internal structure after the internal structure is poured, the aforementioned post-embedded device is improved as follows: The hollow rigid pipe 4 includes a main pipe section 41 located within the internal structure 2, and an extension pipe section 42 for connecting the main pipe section 41 and the inner template 21 of the internal structure. The extension pipe section 42 includes a first end detachably connected to the main pipe section 41 and a second end for extending through the inner template 21. The sealing member is detachably connected to the connecting end of the main pipe section 41, and the sealing member is located within the internal structure 2 when connected to the main pipe section 41. Specifically, as follows... Figure 1 and Figure 2 As shown, the main pipe section 41 includes a steel pipe (seamless steel pipe should be selected) and a first end cap nut 411 fixed to one end of the steel pipe (full welding connection can be used). The extension pipe section 42 is a second end cap nut. The sealing component includes an end cap bolt 61 that is compatible with the first end cap nut 411. The first end cap nut 411 and the second end cap nut 42 can be of the same specification, but the sum of the lengths of the steel pipe and the first end cap nut 411 is smaller than the thickness of the internal structure, but the difference between the two is smaller than the length of the second end cap nut, and the length of the second end cap nut is further sufficient to allow it to pass through the inner template 21 (e.g., Figure 1 (As shown).

[0045] Based on the above improvements: When setting the hollow rigid pipe 4, the first end of the extension pipe section 42 is connected to the main pipe section 41 by spot welding (for easy dismantling later), and then they are fitted together outside the drainage hose 3, with the main pipe section 41 abutting against the foundation pit retaining structure 1; before pouring the internal structure 2, the inner template 21 of the internal structure 2 is first erected, and an opening is made in the inner template 21, through which the second end of the extension pipe section 42 is passed; after the concrete curing of the internal structure 2 is completed and before the injection of the sealing material 6, the inner template 21 and the extension pipe section 42 are removed (the extension pipe section 42 can be removed by side hammering); after the injection of the sealing material 6 and before connecting the sealing component, the part of the drainage hose 3 extending out of the main pipe section 41 is cut off, and then the sealing component is connected to the docking end of the main pipe section 41 (that is, the end bolt 61 is screwed into the first end nut 411).

[0046] Preferably, to make the connection of the head bolt 61 more secure, the sealing component also includes a washer 62 for placing between the first head nut 411 and the head bolt 61. During installation, the washer 62 is first placed on the thread of the head bolt 61, and then the head bolt is screwed onto the first head nut 411 until the washer 62 is clamped.

[0047] In order to further ensure the flatness and the aesthetic appearance of the surface of the inner structure after the inner structure is cast, the rear pre-burying device is further improved as follows: the cup structure 7 is connected to the outer periphery of the butt joint end of the main pipe section 41 (i.e. the first end cover nut 411), and is composed of an annular steel plate and a bottom steel plate, the bottom steel plate is provided with a hole through which the first end cover nut 411 passes, and the bottom steel plate is fully welded to the first end cover nut 411, the plugging member is located in the cup structure 7 in the state of being connected to the main pipe section 41 (as shown in Figure 2 ), and the cup structure 7 is filled with plastering mortar which is flush with the inner side of the inner structure 2.

[0048] Based on the above improvement, when the second end of the extension pipe section 42 is passed out through the hole, the cup structure 7 is abutted to the inner formwork 21 (as shown in Figure 1 ), and after the plugging member is connected to the butt joint end of the main pipe section 41, the cup structure 7 is filled with plastering mortar, so that the plastering mortar covers the plugging member and is flush with the inner side of the inner structure 2. Preferably, after the plugging member is connected to the butt joint end of the main pipe section 41, it is observed whether the plugging member continuously has no water seepage for a period of time (preferably 7 days), if so, the cup structure 7 is filled with plastering mortar.

[0049] In order to further improve the self-waterproof performance of the inner structure 2, the outer periphery of the main pipe section 41 is fixed (fully welded) with at least one water stop plate 8 (which can be an annular steel plate), and preferably two water stop plates 8 are provided and are arranged along the axial direction of the main pipe section 41. The seepage water cannot flow along the inner structure due to the blocking of the multiple water stop plates.

[0050] The present application ensures the flatness and the aesthetic appearance of the surface of the inner structure by the cooperation of the extension pipe section, the cup structure and the plastering mortar.

[0051] The above embodiments of the present application are described in detail in combination with the drawings, and those skilled in the art can make various changes to the present application according to the above description. Therefore, some details in the embodiments should not constitute a limitation on the present application, and the scope of protection of the present application is defined by the appended claims.

Claims

1. A kind of anti-leakage and anti-leakage post-embedded device of foundation pit retaining structure, it is characterized by, include: A drainage hose is installed at the leakage area of ​​the foundation pit retaining structure. The drainage hose includes a first end for inserting into the foundation pit retaining structure and covering the leakage area, and a second end for extending into the foundation pit and extending out of the internal structure to be constructed. A hollow rigid tube fitted around the outer periphery of the drainage hose and used for pre-embedding in the internal structure; Sealing material used for injection into the leakage area, inside the drainage hose, and between the drainage hose and the hollow rigid tube; A sealing element detachably connected to the hollow rigid tube and used to prevent the sealing material from flowing out; wherein, The hollow rigid tube includes a main tube segment located within the internal structure and an extension tube segment for connecting the main tube segment and the inner template of the internal structure. The extension tube segment includes a first end detachably connected to the main tube segment and a second end for extending out of the inner template. The sealing member is detachably connected to the connecting end of the main tube segment, and the sealing member is located within the internal structure when connected to the main tube segment.

2. The anti-seepage and anti-leakage post-embedded device for foundation pit enclosure structure according to claim 1, characterized in that, The main pipe section has a cup-shaped structure around its connecting end. The sealing component is located inside the cup-shaped structure when connected to the main pipe section. The cup-shaped structure is filled with plastering mortar to be flush with the inner side of the internal structure.

3. The anti-seepage and anti-leakage post-embedded device for foundation pit enclosure structure according to claim 1, characterized in that, The main pipe section includes a steel pipe and a first end cap nut that is connected and fixed to one end of the steel pipe. The extension pipe section is a second end cap nut. The sealing component includes an end cap bolt that is adapted to the first end cap nut.

4. The anti-seepage and anti-leakage post-embedded device for foundation pit enclosure structure according to claim 1, characterized in that, At least one waterstop plate is fixed to the outer periphery of the main pipe section.

5. The anti-seepage and anti-leakage post-embedded device for foundation pit enclosure structure according to claim 1, characterized in that, A reinforcing platform is sealed and fixed between the drainage hose and the foundation pit retaining structure, and the outer diameter of the reinforcing platform is not greater than the inner diameter of the hollow rigid pipe.

6. A method of installing a seepage-proof and leakage-proof post-embedded device for a foundation pit retaining structure, characterized in that, Including the following steps: Before constructing the internal structure, drainage hoses are installed in the leakage areas of the foundation pit retaining structure; When binding the internal structural steel bars, a hollow rigid tube is installed so that the hollow rigid tube is sleeved outside the drainage hose; When casting the internal structure, the hollow rigid tube is cast together with the internal structure; After the concrete curing of the internal structure is completed, sealing material is injected into the leakage area and into the drainage hose through the drainage hose. Then, sealing material is injected between the drainage hose and the hollow rigid pipe through the hollow rigid pipe until the inside of the hollow rigid pipe is completely filled, and then the sealing component is connected. The hollow rigid tube includes a main tube section and an extension tube section; When installing the hollow rigid pipe, the first end of the extension pipe section is connected to the main pipe section, and then they are fitted together outside the drainage hose, and the main pipe section is pushed against the pit retaining structure. Before pouring the internal structure, the inner template of the internal structure is first erected, and an opening is made in the inner template to pass the second end of the extension pipe section through the opening. After the concrete curing of the internal structure is completed and before the injection of sealing material, the inner formwork and the extension pipe section are removed; After the sealing material is injected and before the sealing component is connected, the portion of the main tube extending from the drainage hose is cut off, and then the sealing component is connected to the mating end of the main tube. 7.The method of claim 6, wherein: the abutting end of the main pipe section is provided with a cup structure on the outer periphery thereof; the cup structure is abutted against the inner side formwork when the second end of the extension pipe section is passed out of the hole; and the cup structure is filled with plastering mortar after the blocking member is connected to the abutting end of the main pipe section, so that the plastering mortar covers the blocking member and is flush with the inner side of the inner structure. The cup structure is filled with plastering mortar after the blocking member is connected to the abutting end of the main pipe section, so that the plastering mortar covers the blocking member and is flush with the inner side of the inner structure. The cup structure is filled with plastering mortar after the blocking member is connected to the abutting end of the main pipe section, so that the plastering mortar covers the blocking member and is flush with the inner side of the inner structure. ​ 8. The method of installing a diaphragm wall leakproofing and leak hunting post-embedded device according to claim 7, wherein ​

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