Injection type waterproof system suitable for underground engineering

Abstract

The invention relates to the technical field of underground engineering construction, and discloses an injection type waterproof system suitable for underground engineering, which comprises an enclosure structure, a waterproof layer, a template and a grouting device, the waterproof layer is laid on the enclosure structure, a structural side wall is formed by pouring between the template and the waterproof layer, the grouting device is mounted on the template, and the grouting device is mounted on the template. One end of the grouting device is contacted with the waterproof layer, and the other end extends out of the template; and after the structural side wall is initially set, grouting is conducted in the grouting device. According to the method, through synchronous grouting, the void area between the back of the structure and the waterproof layer can be effectively filled, water leakage caused by void is avoided, and due to the fact that the interval time between grouting operation and structural concrete pouring is short, grout and concrete can be fused into a whole, and the integrity between the structure and a grouting material is improved; and meanwhile, the slurry reacts with the self-adhesive layer of the waterproof layer to achieve a pre-paving and anti-sticking effect, so that the completely close skin type waterproof effect is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering construction. More specifically, the present invention relates to an injection waterproofing system applicable to underground engineering. Background Art

[0002] With the continuous development of the urbanization process, the construction of rail transit has entered a period of rapid rise. However, with the increase in the operation years of urban subways, the phenomenon of water seepage and leakage has been increasing. One very important reason is that there may be an unsealed situation between the structure and the waterproof layer due to defects in the pouring process or improper construction operations, forming a water channel. Once leakage occurs, it will bring great troubles to the operation and maintenance of the subway, and at the same time bring an additional cost burden.

[0003] Currently, for the problem of the unsealed situation between the secondary lining of the structure and the waterproof layer, especially in the side wall part of the open-cut subway project, a pre-laid and self-adhered waterproofing membrane is mainly used as the waterproof layer. This kind of waterproofing membrane is generally laid on the base surface of the retaining structure first. After the secondary lining concrete is poured, the adhesive layer on the surface of the membrane forms a pre-laid and self-adhered connection with the poured concrete, so as to achieve a completely sealed "skin-type" waterproofing. This method has relatively high requirements for the flatness of the base surface of the retaining structure. If the flatness does not meet the requirements, it is very likely to affect the actual waterproofing effect. However, in on-site construction, the flatness of the base surface of the retaining structure is often poor, and the construction unit often starts to lay the waterproofing membrane without properly treating the base surface according to the design requirements. After the secondary lining concrete is poured, there may be a situation where the secondary lining and the waterproof layer are not closely attached and there is voiding in some parts, forming water channels one by one. Moreover, after leakage occurs due to this factor, it is often only possible to fill the voided area by post-drilling to treat the leakage. This not only threatens the structural safety, but also affects the operation, and at the same time the construction cost is usually relatively high.

[0004] Therefore, it is necessary to propose an injection waterproofing system applicable to underground engineering to at least partially solve the problems existing in the prior art and enable the structure, especially between the structural side wall and the waterproof layer, to be closely attached. Summary of the Invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention part, which will be further described in detail in the Detailed Implementation part. The Summary of the Invention part of the present invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides an injection waterproofing system applicable to underground engineering, including: Enclosure structure, waterproof layer, formwork and grouting device. The waterproof layer is laid on the enclosure structure. A structural side wall is formed by pouring between the formwork and the waterproof layer. The grouting device is installed on the formwork. One end of the grouting device contacts the waterproof layer, and the other end extends out of the formwork. After the initial setting of the structural side wall, grouting is carried out into the grouting device.

[0007] Preferably, the structural side wall is formed with a structural top slab, a structural middle slab and a structural bottom slab from top to bottom. Structural main reinforcement bars, structural distribution reinforcement bars and structural stirrups are tied inside the structural side wall. A number of formwork openings are provided on the formwork. The center of the formwork opening coincides with the center of the square formed by the structural main reinforcement bars and the structural distribution reinforcement bars. The grouting device is installed in the formwork opening.

[0008] Preferably, longitudinal construction joints and circumferential construction joints are formed during the installation of the formwork. The longitudinal spacing and circumferential spacing of the formwork openings are set to 4 - 6 m. Formwork openings are provided at a distance of 500 mm from the joints on both sides of the circumferential construction joint and above and below the longitudinal construction joint.

[0009] Preferably, the grouting device includes: a fixed flange, a detachable flange and a grouting pipe. The fixed flange is connected to the formwork. The detachable flange is connected to the outside of the fixed flange through fastening bolts. One end of the grouting pipe is screwed to the neck of the detachable flange. The other end of the grouting pipe extends into the structural side wall and contacts the waterproof layer. The detachable flange and the grouting pipe are connected in the center to form a grouting channel.

[0010] Preferably, the fixed flange is circular, including a fixed flange center opening and at least four fixed flange bolt holes. The multiple fixed flange bolt holes are evenly arranged along the circumferential direction of the fixed flange.

[0011] Preferably, the detachable flange is circular, including a detachable flange panel, a detachable flange neck and a detachable flange neck sleeve connected in sequence. A detachable flange center opening runs through the center of the detachable flange. At least four detachable flange bolt holes are evenly arranged along the circumferential direction of the detachable flange panel. The detachable flange bolt holes correspond to the fixed flange bolt holes one by one and are connected through fastening bolts. The detachable flange neck is sleeved in the formwork opening and the fixed flange center opening. The detachable flange neck sleeve is connected to the center of the detachable flange neck and protrudes from its surface. The thickness of the detachable flange neck is equal to the sum of the thicknesses of the formwork and the fixed flange. The detachable flange neck sleeve is provided with an external thread.

[0012] Preferably, the grouting pipe includes a water stop flange and a rubber suction cup. The annular water stop flange is connected to the middle of the grouting pipe. One end of the grouting pipe is provided with an internal thread. The internal thread of the grouting pipe is connected to the external thread of the detachable flange neck sleeve and the connection length is adjustable. The other end of the grouting pipe is provided with a rubber suction cup, and the rubber suction cup contacts the waterproof layer.

[0013] Preferably, the grouting device further includes a screw cap which is screwed to the grouting pipe after the fixed flange, the detachable flange and the formwork are removed.

[0014] Preferably, a leveling layer is formed after the base surface of the retaining structure is treated, and the flatness of the leveling layer satisfies D / L≤1 / 20, where D is the maximum height between two adjacent convex surfaces and L is the minimum distance between two adjacent convex surfaces.

[0015] Preferably, the short side of the waterproof layer is fixed to the base surface of the retaining structure by fixing nails, a gasket is arranged between the fixing nails and the waterproof layer, and the long side of the waterproof layer is overlapped by a self-adhesive edge.

[0016] Compared with the prior art, the present invention provides an injection waterproof system applicable to underground engineering, which has at least the following beneficial effects: 1. Through synchronous grouting, the void area between the back of the structure and the waterproof layer can be effectively filled, avoiding water leakage caused by voids. And because the time interval between the grouting operation and the structure concrete pouring is short, the slurry and the concrete can be integrated, improving the integrity between the structure and the grouting material. At the same time, the slurry reacts with the self-adhesive layer of the waterproof layer (usually a pre-laid and self-adhered waterproof membrane) to achieve the pre-laid and self-adhered effect, realizing a completely close-fitting skin-type waterproofing.

[0017] 2. Since the formwork is removed after grouting, the operation of setting up scaffolds for later backfill grouting is avoided, improving the construction efficiency and saving costs.

[0018] 3. This grouting pipe can be grouted repeatedly. If water leakage is found during the later operation, only need to open the nearby grouting holes to grout again, avoiding the disadvantages of long construction period, high cost, affecting the structural safety and great social impact caused by later drilling.

[0019] 4. A water stop flange is arranged in the middle of the grouting pipe, which can meet the waterproof requirements between the grouting pipe and the surrounding concrete.

[0020] For the injection waterproof system applicable to underground engineering described in the present invention, other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will be understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic cross-sectional view of the fixing and overlapping of the waterproof layer in the present invention; Figure 2 is a schematic cross-sectional layout view of the injection waterproof system in the present invention; Figure 3 Longitudinal sectional layout schematic diagram of the injection waterproof system in the present invention; Figure 4 Sectional schematic diagram after installation of the grouting device in the present invention; Figure 5 Sectional schematic diagram after installation of the formwork in the present invention; Figure 6 Sectional schematic diagram of the grouting pipe in the present invention; Figure 7 Planar schematic diagram of the fixed flange in the present invention; Figure 8 Planar schematic diagram of the detachable flange in the present invention; Figure 9 Sectional schematic diagram of the fixed flange and the detachable flange in the present invention; Figure 10 Sectional schematic diagram of the screw cap in the present invention.

[0022] In the figure: 1, retaining structure; 2, waterproof layer; 3, leveling layer; 4, fixing nails; 5, gaskets; 6, structural side wall; 7, structural roof; 8, structural middle plate; 9, structural floor; 10, grouting device; 11, longitudinal construction joint; 12, circumferential construction joint; 13, formwork; 14, formwork opening; 15, structural main reinforcement; 16, structural distribution reinforcement; 17, structural stirrup; 18, grouting pipe; 19, water stop flange; 20, rubber suction cup; 21, internal thread; 22, fixed flange; 23, central opening of the fixed flange; 24, bolt holes of the fixed flange; 25, detachable flange; 26, central opening of the detachable flange; 27, bolt holes of the detachable flange; 28, detachable flange panel; 29, neck of the detachable flange; 30, sleeve of the neck of the detachable flange; 31, external thread; 32, fastening bolt; 33, screw cap. Detailed implementation manners

[0023] The following further elaborates on the present invention in conjunction with the accompanying drawings and embodiments, so that those skilled in the art can implement it with reference to the text of the specification.

[0024] It should be understood that terms such as "having", "including", and "comprising" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0025] Embodiment 1 As Figures 1-10 shown, the present invention provides an injection waterproof system applicable to underground engineering, including: Enclosure structure 1, waterproof layer 2, formwork 13 and grouting device 10. The waterproof layer 2 is laid on the enclosure structure 1. A structural side wall 6 is formed by pouring between the formwork 13 and the waterproof layer 2. The grouting device 10 is installed on the formwork 13. One end of the grouting device 10 contacts the waterproof layer 2, and the other end extends out of the formwork 13; after the initial setting of the structural side wall 6, grouting is carried out into the grouting device 10.

[0026] Among them, the structural side wall 6 is formed with a structural top plate 7, a structural middle plate 8 and a structural bottom plate 9 from top to bottom. Structural main reinforcement bars 15, structural distribution reinforcement bars 16 and structural stirrups 17 are tied inside the structural side wall 6. A number of formwork openings 14 are provided on the formwork 13. The center of the formwork opening 14 coincides with the center of the square formed by the structural main reinforcement bars 15 and the structural distribution reinforcement bars 16. The grouting device 10 is installed in the formwork opening 14.

[0027] Among them, when the formwork 13 is installed, a longitudinal construction joint 11 and a circumferential construction joint 12 are formed. The longitudinal spacing and circumferential spacing of the formwork openings 14 are set to 4 - 6m. Formwork openings 14 are provided at a distance of 500mm from the joints on both sides of the circumferential construction joint 12 and above and below the longitudinal construction joint 11.

[0028] Among them, the grouting device 10 includes: a fixed flange 22, a detachable flange 25 and a grouting pipe 18. The fixed flange 22 is connected to the formwork 13. The detachable flange 25 is connected to the outside of the fixed flange 22 through fastening bolts 32. One end of the grouting pipe 18 is screwed to the neck of the detachable flange 25. The other end of the grouting pipe 18 extends into the structural side wall 6 and contacts the waterproof layer 2. The detachable flange 25 and the grouting pipe 18 are centrally connected and arranged to form a grouting channel.

[0029] Among them, the fixed flange 22 is set to be circular, including a fixed flange center opening 23 and at least four fixed flange bolt holes 24. The multiple fixed flange bolt holes 24 are evenly arranged along the circumferential direction of the fixed flange 22.

[0030] Among them, the detachable flange 25 is set to be circular, including a detachable flange panel 28, a detachable flange neck 29 and a detachable flange neck sleeve 30 connected in sequence. A detachable flange center opening 26 runs through the center of the detachable flange 25. At least four detachable flange bolt holes 27 are evenly arranged along the circumferential direction of the detachable flange panel 28. The detachable flange bolt holes 27 correspond one-to-one with the fixed flange bolt holes 24 and are connected through fastening bolts 32; the detachable flange neck 29 is sleeved in the formwork opening 14 and the fixed flange center opening 23; the detachable flange neck sleeve 30 is connected to the center of the detachable flange neck 29 and protrudes from its surface. The thickness of the detachable flange neck 29 is equal to the sum of the thicknesses of the formwork 13 and the fixed flange 22; the detachable flange neck sleeve 30 is provided with an external thread 31.

[0031] Among them, the grouting pipe 18 includes a water-stop flange 19 and a rubber suction cup 20. The annular water-stop flange 19 is connected to the middle of the grouting pipe 18. One end of the grouting pipe 18 is provided with an internal thread 21, and the internal thread 21 of the grouting pipe 18 is connected to the external thread 31 of the detachable flange neck sleeve 30 with an adjustable connection length. The other end of the grouting pipe 18 is provided with a rubber suction cup 20, and the rubber suction cup 20 contacts the waterproof layer 2.

[0032] Among them, the grouting device 10 further includes: a screw cap 33. After the fixed flange 22, the detachable flange 25 and the formwork 13 are removed, the screw cap 33 is screwed to the grouting pipe 18.

[0033] Among them, after the base surface of the retaining structure 1 is treated, a leveling layer 3 is formed. The flatness of the leveling layer 3 satisfies D / L≤1 / 20, where D is the maximum height between two adjacent convex surfaces and L is the minimum distance between two adjacent convex surfaces.

[0034] Among them, the short side of the waterproof layer 2 is fixed to the base surface of the retaining structure 1 by fixing nails 4. A gasket 5 is provided between the fixing nails 4 and the waterproof layer 2. The long side of the waterproof layer 2 is lap-jointed with a self-adhesive edge.

[0035] The working principle and beneficial effects of the above technical solution are as follows: An injection waterproof system applicable to underground engineering of the present invention includes the following steps when the system is implemented: Step 1: According to the construction segments of the structural side wall 6, the formwork length, and the steel bar arrangement, a number of formworks 13 are customized. A formwork opening 14 with a diameter of 100 mm is provided at an appropriate position in the middle. The center of the formwork opening 14 coincides with the center of the square formed by the structural main bars 15 and the structural distribution bars 16.

[0036] Step 2: Customize the fixed flange 22, the detachable flange 25, and the grouting pipe 18 in combination with the size of the formwork opening 14 in Step 1.

[0037] The fixed flange 22 has a thickness of 10 mm, is circular in shape, the diameter of the central opening 23 of the fixed flange is 100 mm, and at least 4 fixed flange bolt holes 24 are provided.

[0038] The detachable flange 25 is circular, includes a detachable flange panel 28 and a detachable flange neck 29. The diameter of the central opening of the detachable flange is 24 mm. The thickness of the detachable flange panel 28 is 10 mm. At least 4 detachable flange bolt holes 27 are provided and the hole positions correspond to the fixed flange bolt holes 24. The outer diameter of the detachable flange neck 29 is 98 mm and can be inserted into the formwork opening 14 and the central opening 23 of the fixed flange. A detachable flange neck sleeve 30 protruding from the surface of the detachable flange neck 29 is provided at the center of the detachable flange neck 29. The total thickness of the detachable flange neck 29 should be the sum of the thicknesses of the formwork 13 and the fixed flange 22.

[0039] The inner diameter of the grouting pipe 18 is 32 mm, the wall thickness is 3 mm, and a water-stop flange 19 with a thickness of 3 mm and a width of 20 mm is arranged in the middle. The detachable flange neck sleeve 30 is provided with an external thread 31, and one end of the grouting pipe 18 is provided with an internal thread 21. The external thread 31 and the internal thread 21 can be connected to adjust the connection length between the detachable flange 25 and the grouting pipe 18. The other end of the grouting pipe 18 is sleeved with a rubber suction cup 20.

[0040] Step 3: Treat the base surface of the retaining structure 1. The base surface should be cleaned up to form a leveling layer 3. The flatness of the leveling layer 3 should meet the requirement: D / L ≤ 1 / 20, where D is the maximum height between two adjacent convex surfaces, and L is the minimum distance between two adjacent convex surfaces. And it is required that the concave and convex parts should be smooth and gentle. The base surface should be clean, flat and firm, without looseness, sanding or peeling.

[0041] Step 4: Lay the waterproof layer 2 on the treated base surface of the retaining structure 1. The waterproof layer 2 is fixed on the base surface by the mechanical fixing method with short sides. The fixing points of the mechanical fixing method are 2 cm away from the edge of the waterproof layer 2, and the nail spacing of the fixing nails 4 is not greater than 50 cm. The nail length shall not be less than 27 mm, and the waterproof layer 2 is firmly fixed on the base surface with the cooperation of the gasket 5. The diameter of the gasket 5 is not less than 2 cm. The long sides of the waterproof layer 2 are overlapped with self-adhesive edges, and the short sides are overlapped with the matching adhesive tape (between the coils), and the upper layer presses the lower layer for overlapping. The short side overlap joints should be staggered by more than 0.5 m.

[0042] Step 5: After the waterproof layer 2 is laid, lay the waterproof reinforcement layer across the joints at all construction joints and deformation joints. The width of the construction joint reinforcement layer is 50 cm, and the width of the deformation joint reinforcement layer is 1 m.

[0043] Step 6: Bind the steel bars of the structural side wall 6 (including the structural main bars 15, structural distribution bars 16 and structural stirrups 17), and then install the formwork 13, so that the longitudinal spacing and circumferential spacing of the formwork openings 14 are controlled within 4 - 6 meters. At the same time, formwork openings 14 are arranged on both sides of the circumferential construction joint 12 and above or below the longitudinal construction joint 11 at a distance of 500 mm from the joint.

[0044] Step 7: Align the central opening 23 of the fixed flange with the formwork opening 14 and connect and fix it to the formwork 13. If the formwork 13 is a steel formwork, welding is used; if the formwork 13 is a wooden formwork, screw connection (without penetrating the formwork) is used.

[0045] Step 8: Measure the vertical distance between the waterproof layer 2 at the projection of the position of the formwork opening 14 and the inner skin of the formwork 13. Connect the detachable flange 25 and the grouting pipe 18 through the external thread 31 and the internal thread 21, and by adjusting the external thread 31 and the internal thread 21, make the distance between the inner skin of the detachable flange 25 and the outermost rubber suction cup 20 of the grouting pipe 18 consistent with the measured distance.

[0046] Step 9: Insert the detachable flange 25 and the grouting pipe 18 into the template opening 14, fit the detachable flange panel 28 with the fixed flange 22, and rotate the detachable flange 25 to align the detachable flange bolt holes 27 with the fixed flange bolt holes 24, and connect the detachable flange 25 with the fixed flange 22 by tightening the bolts 32.

[0047] Step 10: Pour the structural side wall 6. During the pouring process, pay attention to avoiding the vibrating rod touching the grouting pipe 18.

[0048] Step 11: Grout. After the initial setting of the structural side wall 6, grout into the grouting pipe 18 through the central opening 26 of the detachable flange, and pay attention to controlling the grouting pressure during the grouting process.

[0049] Step 12: Use ground penetrating radar to scan for voids. After the structural side wall 6 reaches the design strength, use ground penetrating radar to scan the compactness of the poured structural side wall 6. If there are voids or non-compact areas, the nearby grouting pipe 18 can be used to grout again according to the requirements of Step 11 until the structural side wall 6 is compact.

[0050] Step 13: After Step 12 is completed, remove the tightening bolts 32, rotate the detachable flange 25 to remove it, and remove the fixed flange 22 and the template 13.

[0051] Step 14: Cut off the grouting pipe 18 extending outside the inner skin of the structure, and cover the orifice of the grouting pipe 18 with a matching screw cap 33 so as to realize repeatable grouting by opening the screw cap 33 in the later stage.

[0052] As can be seen from the above, the injectable waterproof system applicable to underground engineering of the present invention has the following effects: 1. Through synchronous grouting, the void area between the back of the structure and the waterproof layer 2 can be effectively filled, avoiding water leakage caused by voids. And because the time interval between the grouting operation and the pouring of the structural concrete is short, the slurry and the concrete can be integrated into one body, improving the integrity between the structure and the grouting material. At the same time, the slurry reacts with the self-adhesive layer of the waterproof layer 2 (usually a pre-laid and self-adhered waterproof coiled material) to achieve the pre-laid and self-adhered effect, realizing a completely close-fitting skin-type waterproofing.

[0053] 2. Since the formwork is removed after grouting, the operation of setting up scaffolds for backfill grouting in the later stage is avoided, improving the construction efficiency and saving costs.

[0054] 3. This grouting pipe can be grouted repeatedly. If water leakage is found during the later operation, only need to open the nearby grouting hole to grout again, avoiding the disadvantages of long construction period, high cost, affecting the structural safety and great social impact caused by drilling in the later stage.

[0055] 4. A water-stop flange 19 is provided in the middle of the grouting pipe 18, which can meet the waterproof requirements between the grouting pipe 18 and the surrounding concrete.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the examples shown and described here.

Claims

1. An injection waterproofing system suitable for underground engineering, characterized in that: include: A retaining structure (1), a waterproof layer (2), a template (13) and a grouting device (10); the waterproof layer (2) is laid on the retaining structure (1); a structural side wall (6) is cast between the template (13) and the waterproof layer (2); the grouting device (10) is installed on the template (13); one end of the grouting device (10) is in contact with the waterproof layer (2) and the other end extends out of the template (13); and grouting is injected into the grouting device (10) after the structural side wall (6) is initially set.

2. The injection waterproofing system suitable for underground engineering according to claim 1, characterized in that: The structural side wall (6) is formed with a structural top plate (7), a structural middle plate (8) and a structural bottom plate (9) from top to bottom. Structural main reinforcement (15), structural distribution reinforcement (16) and structural stirrups (17) are tied inside the structural side wall (6). A plurality of template openings (14) are arranged on the template (13). The center of the template opening (14) is consistent with the center of a square formed by the structural main reinforcement (15) and the structural distribution reinforcement (16). The grouting device (10) is installed in the template opening (14).

3. The injection waterproofing system suitable for underground engineering according to claim 2, characterized in that: When the formwork (13) is installed, a longitudinal construction joint (11) and an annular construction joint (12) are formed. The longitudinal spacing and annular spacing of the formwork openings (14) are set to 4 to 6 m. The formwork openings (14) are set at 500 mm from the joints on both sides of the annular construction joint (12) and on the upper and lower sides of the longitudinal construction joint (11).

4. The injection waterproofing system suitable for underground engineering according to claim 2, characterized in that: The grouting device (10) comprises: a fixed flange (22), a detachable flange (25) and a grouting pipe (18); the fixed flange (22) is connected to the template (13); the detachable flange (25) is connected to the outside of the fixed flange (22) via a fastening bolt (32); one end of the grouting pipe (18) is screwed to the neck of the detachable flange (25); the other end of the grouting pipe (18) extends into the structural side wall (6) to contact the waterproof layer (2); the detachable flange (25) and the grouting pipe (18) are centrally connected to form a grouting channel.

5. The injection-type waterproofing system suitable for underground engineering according to claim 4, characterized in that: The fixed flange (22) is arranged in a circular shape, comprising a fixed flange central opening (23) and at least four fixed flange bolt holes (24), and the plurality of fixed flange bolt holes (24) are evenly arranged along the circumferential direction of the fixed flange (22).

6. The injection-type waterproofing system suitable for underground engineering according to claim 5, characterized in that: The removable flange (25) is arranged in a circular shape, and comprises a removable flange panel (28), a removable flange neck (29) and a removable flange neck sleeve (30) which are connected in sequence. A removable flange center opening (26) is arranged through the center of the removable flange (25). The removable flange panel (28) is evenly arranged with at least four removable flange bolt holes (27) along the circumferential direction. The removable flange bolt holes (27) correspond to the fixed flange bolt holes (24) one by one and are connected by fastening bolts (32). The removable flange neck (29) is sleeved in the template opening (14) and the fixed flange center opening (23). The removable flange neck sleeve (30) is connected to the center of the removable flange neck (29) and protrudes from its surface. The thickness of the removable flange neck (29) is equal to the sum of the thickness of the template (13) and the fixed flange (22). The removable flange neck sleeve (30) is provided with an external thread (31).

7. The injection-type waterproofing system suitable for underground engineering according to claim 6, characterized in that: The grouting pipe (18) comprises a water stop flange (19) and a rubber suction cup (20); the annular water stop flange (19) is connected to the middle of the grouting pipe (18); one end of the grouting pipe (18) is provided with an internal thread (21); the internal thread (21) of the grouting pipe (18) is connected to the external thread (31) of the detachable flange neck sleeve (30), and the connection length is adjustable; the other end of the grouting pipe (18) is provided with a rubber suction cup (20), and the rubber suction cup (20) is in contact with the waterproof layer (2).

8. The injection-type waterproofing system suitable for underground engineering according to claim 7, characterized in that: The grouting device (10) further comprises a screw cover (33), and after the fixed flange (22), the detachable flange (25) and the template (13) are removed, the screw cover (33) is screwed to the grouting pipe (18).

9. The injection-type waterproofing system suitable for underground engineering according to claim 1, characterized in that: After the base surface of the enclosure structure (1) is processed, a leveling layer (3) is formed. The flatness of the leveling layer (3) satisfies D / L≤1 / 20, where D is the maximum height between two adjacent convex surfaces and L is the minimum distance between two adjacent convex surfaces.

10. The injection-type waterproofing system suitable for underground engineering according to claim 1, characterized in that: The short sides of the waterproof layer (2) are fixed to the base surface of the enclosure structure (1) by means of fixing nails (4), a gasket (5) is arranged between the fixing nails (4) and the waterproof layer (2), and the long sides of the waterproof layer (2) are overlapped by means of self-adhesive edges.

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