A precast pre-embedded duct anti-grout leakage system for segmental beams

Abstract

This utility model relates to the field of segmental beam casting construction technology, and particularly to a grout leakage prevention system for precast embedded ducts in segmental beams. A first through hole is provided on a first structure; a rubber pull-out rod passes through the first through hole; a single-lip sealing ring is sealed between the rubber pull-out rod and the first structure, with the single-lip sealing ring fitted over the outside of the rubber pull-out rod, and at least a portion of the single-lip sealing ring located within the first through hole; a first fixing ring is fitted over the outside of the rubber pull-out rod, and the first fixing ring abuts against the end of the single-lip sealing ring; a first connecting device can drive the first fixing ring to move along the length of the rubber pull-out rod towards the single-lip sealing ring. Compared with sealing with foam glue, glass glue, or conical rubber plates, the grout leakage prevention system for precast embedded ducts in segmental beams of this application has less impact on the sealing effect due to the skill of the construction personnel, and the appearance quality of the sealed area can also be effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of segmental beam casting construction technology, and in particular to a grout leakage prevention system for prefabricated embedded ducts in segmental beams. Background Technology

[0002] Rubber pull rods are a new type of rubber core mold used for small-diameter holes in concrete components. They are mainly used in the molding of prestressed ducts in bridges and other construction fields. They achieve axial tensile deformation through highly elastic rubber material and utilize the incompressible properties of volume to allow for natural radial shrinkage, which can be extracted without damage after the initial setting of concrete.

[0003] Currently, during bridge construction, in order to facilitate the smooth insertion and removal of rubber pull rods for segmental beams, and to reduce the gap between the rubber rods after the pre-drilled holes in the construction section and the rubber rods during the fabrication of the next segment, the diameter of the reserved holes for the pull rods on the template is only increased by 4mm. That is, the inner diameter of the reserved holes on the end template is about 4mm larger than the diameter of the pull rods that are compatible with it. During construction, grout leakage sometimes occurs due to the gap between the pull rods and the reserved holes.

[0004] To solve the above problems, the gap between the pull rod and the reserved channel is generally sealed with foam glue, glass glue or conical rubber plate. The sealing effect is greatly affected by the skill of the construction personnel, and the appearance quality of the sealed part is also difficult to guarantee. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology, which generally uses foam glue, glass glue or conical rubber plate to seal the gap between the pull rod and the reserved channel. The sealing effect is greatly affected by the skill of the construction personnel and the appearance quality of the precast segmental beam is also difficult to guarantee. This invention provides a grout leakage prevention system for the precast embedded channel of segmental beam.

[0006] In a first aspect, this utility model provides a grout leakage prevention system for precast embedded ducts in segmental beams, comprising:

[0007] The first structure has a first through hole; A rubber pull rod penetrates the first through hole; A single-lip sealing ring is provided between the rubber pull-out rod and the first structure. The single-lip sealing ring is sleeved on the outside of the rubber pull-out rod, and at least a portion of the single-lip sealing ring is located inside the first through hole. The first fixing ring is sleeved on the outside of the rubber pull rod, and the first fixing ring abuts against the end of the single lip sealing ring; The first connecting device can drive the first fixing ring to move along the length of the rubber pull rod toward the single-lip sealing ring.

[0008] The segmental beam precast embedded hole anti-leakage grouting system described in this application uses a single-lip sealing ring to seal the gap between the rubber pull-out rod and the first through hole on the first structure. The single-lip sealing ring is squeezed and fixed by the first fixing ring and the first connecting device. Compared with foam glue, glass glue or conical rubber plate sealing, the above method is less affected by the skill of the construction personnel and can effectively guarantee the appearance quality of the sealing point.

[0009] Preferably, the first connecting device includes a connecting rod, which is connected to the first structure. The connecting rod has a threaded portion along the length of the rubber pull-out rod, and a first nut is threaded onto the threaded portion. The first fixing ring is located between the first nut and the single-lip sealing ring, and the first nut abuts against the first fixing ring.

[0010] The first nut moves relative to the length of the threaded part by engaging with the threaded part, thereby causing the first nut to squeeze the first fixing ring. This, in turn, causes the first fixing ring to squeeze the single-lip sealing ring, resulting in a better sealing effect and ensuring that the sealing effect of the single-lip sealing ring is maintained for a longer period of time.

[0011] Preferably, the first fixing ring includes a first ring structure sleeved on the outside of the rubber pull rod. The first ring structure abuts against the end of the single-lip sealing ring. At least two first ear seats are connected to the first ring structure outwardly. The first ear seats are provided with second through holes. The first ear seats correspond one-to-one with the connecting rods. The connecting rods pass through the second through holes. The first ear seats are located between the first nut and the first structure. The first nut can push the first ear seats.

[0012] Preferably, the sidewall of the first annular structure is inclined relative to the outer wall of the rubber pull rod, so that an annular cavity is formed between the sidewall of the first annular structure and the outer wall of the rubber pull rod.

[0013] Preferably, an annular sealing ring is provided inside the annular cavity.

[0014] Preferably, the end of the annular sealing ring away from the single-lip sealing ring protrudes from the annular cavity.

[0015] Preferably, it further includes a second fixing ring, which is sleeved on the outside of the rubber pull rod and abuts against the end of the annular sealing ring away from the single-lip sealing ring.

[0016] Preferably, it further includes a second connecting device, which can drive the second fixing ring to move along the length direction of the rubber pull-out rod toward the single-lip sealing ring.

[0017] By combining the second fixing ring, the second connecting device, and the annular sealing ring, not only is an additional layer of sealing achieved, resulting in better grout leakage prevention of the precast pre-embedded grouting system for segmental beams, but more importantly, based on the annular sealing ring's uniform cross-section structure, and with the first ring structure's sidewall inclined relative to the outer wall of the rubber pull-out rod, and the connecting rod's diameter being smaller than the diameter of the second through hole, the annular sealing ring, when compressed, can center the first fixing ring. This ensures that the compression position of the single-lip sealing ring is always aligned with the center of the single-lip sealing ring, resulting in more reasonable stress distribution on the single-lip sealing ring and extending its service life.

[0018] Preferably, the second connecting device includes a second nut that is threadedly engaged with the threaded portion, and the second fixing ring includes a second ring structure sleeved on the outside of the rubber pull rod. The second ring structure abuts against the end of the annular sealing ring away from the single-lip sealing ring. At least two second lugs are connected to the second ring structure protruding outward. The second lugs are provided with a third through hole, and a corresponding connecting rod passes through the third through hole. The second lugs are located between the second nut and the first nut, and the second nut can push the second lugs.

[0019] Preferably, the connecting rod includes a first rod portion, a second rod portion, and a third rod portion, the ends of the first rod portion, the second rod portion, and the third rod portion are connected to form a T-shaped structure, the threaded portion is connected to the first rod portion, the second rod portion, and the third rod portion, and the first rod portion, the second rod portion, and the third rod portion are all connected to the first structure.

[0020] Preferably, the first structure is a plate structure.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: The segmental beam precast embedded hole anti-leakage grouting system described in this application uses a single-lip sealing ring to seal the gap between the rubber pull-out rod and the first through hole on the first structure. The single-lip sealing ring is squeezed and fixed by the first fixing ring and the first connecting device. Compared with foam glue, glass glue or conical rubber plate sealing, the above method is less affected by the skill of the construction personnel and can effectively guarantee the appearance quality of the sealing point. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of a prefabricated embedded duct anti-leakage grouting system for segmental beams according to the present invention.

[0023] Figure 2 This is a front view schematic diagram of a prefabricated embedded duct anti-leakage grouting system for segmental beams according to this utility model.

[0024] Figure 3This is a longitudinal sectional schematic diagram of a prefabricated embedded duct anti-leakage grouting system for segmental beams according to this utility model.

[0025] Figure 4 This is a three-dimensional schematic diagram of the first fixing ring of this utility model.

[0026] Figure 5 This is a three-dimensional schematic diagram of the connecting rod of this utility model.

[0027] Figure 6 This is a three-dimensional schematic diagram of the cooperation between the prefabricated embedded duct anti-grout leakage system of the segmental beam and the first structure of this utility model.

[0028] Figure 7 This is a three-dimensional schematic diagram of a prefabricated embedded duct anti-leakage system for segmental beams according to the present invention (with a second fixing ring).

[0029] Figure 8 This is a front view schematic diagram of a prefabricated embedded duct anti-leakage grouting system for segmental beams according to the present invention (with a second fixing ring).

[0030] Figure 9 This is a longitudinal sectional view of a prefabricated embedded duct anti-leakage grouting system for segmental beams according to the present invention (with a second fixing ring).

[0031] Figure 10 This is a three-dimensional schematic diagram of the second fixing ring of this utility model.

[0032] Figure 11 This is a schematic diagram showing the first through hole configuration of the first structure of this utility model.

[0033] Figure 12 This is a schematic longitudinal section of the annular sealing ring of this utility model.

[0034] Figure 13 This is a longitudinal sectional view of the single-lip sealing ring of this utility model.

[0035] Marked in the image: Detailed Implementation The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0036] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0038] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0039] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0040] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0041] Example 1 The precast embedded duct anti-grout leakage system for segmental beams described in this embodiment includes: First structure 1, the first structure 1 is provided with a first through hole 10; Rubber pull rod 2, penetrating the first through hole 10; A single-lip sealing ring 3 is provided between the rubber pull rod 2 and the first structure 1. The single-lip sealing ring 3 is sleeved on the outside of the rubber pull rod 2, and at least a portion of the single-lip sealing ring 3 is located inside the first through hole 10. The first fixing ring 4 is sleeved on the outside of the rubber pull rod 2, and the first fixing ring 4 abuts against the end of the single lip sealing ring 3; The first connecting device 11 can drive the first fixing ring 4 to move along the length direction of the rubber pull rod 2 toward the single lip sealing ring 3.

[0042] In this embodiment, a precast pre-embedded duct anti-grout leakage system for segmental beams is described. The gap between the rubber pull-out rod 2 and the first through hole 10 on the first structure 1 is sealed by a single-lip sealing ring 3. The single-lip sealing ring 3 is squeezed and fixed by the first fixing ring 4 and the first connecting device 11. Compared with sealing with foam glue, glass glue or conical rubber plate, the sealing effect of the above method is less affected by the skill of the construction personnel, and the appearance quality of the sealing point can also be effectively guaranteed.

[0043] Preferably, the first connecting device 11 includes a connecting rod 7, which is connected to the first structure 1. The connecting rod 7 has a threaded portion 15 along the length direction of the rubber pull rod 2. A first nut 9 is threaded onto the threaded portion 15. The first fixing ring 4 is located between the first nut 9 and the single-lip sealing ring 3. The first nut 9 abuts against the first fixing ring 4.

[0044] The first nut 9 moves relative to the length of the threaded portion 15 by engaging with the threaded portion 15, thereby causing the first nut 9 to press against the first fixing ring 4. This, in turn, causes the first fixing ring 4 to press against the single-lip sealing ring 3, resulting in a better sealing effect for the single-lip sealing ring 3 and ensuring that the sealing effect of the single-lip sealing ring 3 is maintained for a longer period of time.

[0045] Preferably, the first fixing ring 4 includes a first ring structure 12 sleeved on the outside of the rubber pull rod 2. The first ring structure 12 abuts against the end of the single-lip sealing ring 3. At least two first ear seats 13 are connected to the first ring structure 12 protruding outward. The first ear seats 13 are provided with second through holes 14. The first ear seats 13 correspond one-to-one with the connecting rod 7. The connecting rod 7 passes through the second through holes 14. The first ear seats 13 are located between the first nut 9 and the first structure 1. The first nut 9 can push the first ear seats 13.

[0046] Preferably, the sidewall of the first annular structure 12 is inclined relative to the outer wall of the rubber extraction rod 2, so that an annular cavity 19 is formed between the sidewall of the first annular structure 12 and the outer wall of the rubber extraction rod 2.

[0047] In one or more embodiments, an annular sealing ring 5 is provided inside the annular cavity 19.

[0048] In one or more embodiments, the end of the annular sealing ring 5 away from the single-lip sealing ring 3 protrudes from the annular cavity 19.

[0049] In one or more embodiments, a second fixing ring 6 is further included, which is sleeved on the outside of the rubber pull rod 2 and abuts against the end of the annular sealing ring 5 away from the single lip sealing ring 3.

[0050] In one or more embodiments, a second connecting device 8 is also included, which can drive the second fixing ring 6 to move along the length direction of the rubber pull rod 2 toward the single-lip sealing ring 3.

[0051] By combining the second fixing ring 6, the second connecting device 8, and the annular sealing ring 5, not only is an additional layer of sealing achieved, resulting in better grout leakage prevention of the precast pre-embedded grouting system for segmental beams, but more importantly, based on the uniform cross-section structure of the annular sealing ring 5, and with the sidewall of the first ring structure 12 inclined relative to the outer wall of the rubber pull-out rod 2, and the diameter of the connecting rod 7 being smaller than the diameter of the second through hole 14, the annular sealing ring 5, when compressed, can center the first fixing ring 4, ensuring that the compression position of the single-lip sealing ring 3 is always consistent with the center position of the single-lip sealing ring 3. This makes the force on the single-lip sealing ring 3 more reasonable, thereby extending the service life of the single-lip sealing ring 3.

[0052] In one or more embodiments, the second connecting device 8 includes a second nut that is threaded into the threaded portion 15, and the second fixing ring 6 includes a second ring structure 21 sleeved on the outside of the rubber pull rod 2. The second ring structure 21 abuts against the end of the annular sealing ring 5 away from the single lip sealing ring 3. At least two second lugs 22 are connected to the second ring structure 21 protruding outward. The second lugs 22 are provided with a third through hole 23. A corresponding connecting rod 7 passes through the third through hole 23. The second lugs 22 are located between the second nut and the first nut 9. The second nut can push the second lugs 22.

[0053] In one or more embodiments, the connecting rod 7 includes a first rod portion 18, a second rod portion 16, and a third rod portion 17. The ends of the first rod portion 18, the second rod portion 16, and the third rod portion 17 are connected to form a T-shaped structure. The threaded portion 15 is connected to the first rod portion 18, the second rod portion 16, and the third rod portion 17. The first rod portion 18, the second rod portion 16, and the third rod portion 17 are all connected to the first structure 1.

[0054] In one or more embodiments, the first structure 1 is a plate structure.

[0055] The grout leakage prevention system for prefabricated embedded holes in segmental beams described in this embodiment is applicable to the construction of prefabricated rubber pull-out rods 2, ventilation holes, and temporary tensioning embedded holes in segmental beams.

[0056] In one or more embodiments, the segmental beam prefabricated embedded hole anti-leakage grouting system described in this embodiment is as follows: the first structure 1 is set on the end mold of the segmental beam in bridge construction, the first through hole 10 is used as the reserved hole of the end mold, and the gap sealing quality of the above-mentioned gap is improved without affecting the efficiency by optimizing the gap sealing process between the rubber pull rod 2 and the reserved hole of the end mold.

[0057] The segmental beam precast embedded hole anti-leakage system described in this embodiment: the gap between the rubber pull rod 2 and the prestressed hole [first through hole 10] reserved in the end mold is sealed by a customized single lip sealing ring 3, and fixed by the first fixing ring 4, the threaded part 15, and the first nut 9.

[0058] In one or more embodiments, the segmental beam precast embedded duct anti-leakage grouting system described in this embodiment involves the following steps during construction: First, the rubber pull rod 2 and the first structure 1 are installed. Then, a single-lip sealing ring 3 is installed, which is inserted through the exposed end of the rubber pull rod 2, with the single lip portion completely inserted into the gap between the rubber pull rod 2 and the first through hole 10, thus centering the rubber pull rod 2 and improving the duct forming effect in the later stage. Next, the first fixing ring 4 is inserted through the exposed end of the rubber pull rod 2, and the side away from the first nut 9 directly contacts the single-lip sealing ring 3. The threaded part 15 passes through the second through hole 14 on the first ear seat 13 from the template pre-reserved screw and engages with the first nut 9. The first nut 9 is preferably an M20 or M24 nut. After the concrete is poured, before removing the rubber pull rod 2, the first nut 9, the first fixing ring 4, and the single-lip sealing ring 3 are removed in sequence.

[0059] In one or more embodiments, the single-lip sealing ring 3 includes an annular portion 24 and a flange portion 25 protruding from the end of the annular portion 24. The annular portion 24 is disposed between the rubber pull rod 2 and the first through hole 10, and the flange portion 25 abuts against one side of the first structure 1 for positioning, so as to prevent the rubber pull rod 2 from passing directly between the rubber pull rod 2 and the first through hole 10 when the single-lip sealing ring 3 is squeezed.

[0060] The following are the key points of the rubber pull rod 2 anti-grout leakage device: When installing the single-lip sealing ring 3, the single-lip part [annular part 24] should be completely inserted into the gap between the rubber pull-out rod 2 and the first through hole 10, so that the rubber pull-out rod 2 is centered.

[0061] 2. The end face of the first fixing ring 4 is tightly fitted with the single lip sealing ring 3 to prevent the single lip sealing ring 3 from loosening.

[0062] Through the above optimizations and improvements, the pre-embedded grout leakage prevention system for segmental beams described in this embodiment greatly reduces the probability of grout leakage at the two ends of the rubber pull rod and improves the overall appearance quality of the prefabricated segmental beams.

[0063] Single lip sealing ring 3: inner diameter 90-100mm, lip thickness 2mm; made of rubber.

[0064] In the above scheme: 1. The lip portion of the single-lip sealing ring 3 should be fully embedded in the gap between the rubber pull rod 2 and the first through hole 10, ensuring that the rubber pull rod 2 is centered.

[0065] 2. The first nut 9 has an anti-loosening function. If necessary, two first nuts 9 can be overlapped.

[0066] The precast pre-embedded duct anti-grout leakage system for segmental beams described in this embodiment effectively reduces the influence of construction operators, greatly reduces the probability of grout leakage at the junction of the rubber pull rod 2 and the template, and improves the overall appearance quality of the precast segmental beams.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A segmental beam prefabrication pre-buried duct leak-proof grouting system, characterized in that, include: The first structure (1) has a first through hole (10). A rubber pull rod (2) penetrates the first through hole (10). A single-lip sealing ring (3) is provided between the rubber pull rod (2) and the first structure (1). The single-lip sealing ring (3) is sleeved on the outside of the rubber pull rod (2). At least a part of the single-lip sealing ring (3) is located inside the first through hole (10). The first fixing ring (4) is sleeved on the outside of the rubber pull rod (2), and the first fixing ring (4) abuts against the end of the single lip sealing ring (3); The first connecting device (11) can drive the first fixing ring (4) to move along the length direction of the rubber pull rod (2) toward the single lip sealing ring (3).

2. The segmental beam precast pre-buried duct leak-proof grout system according to claim 1, characterized in that, The first connecting device (11) includes a connecting rod (7), which is connected to the first structure (1). The connecting rod (7) has a threaded part (15) along the length direction of the rubber pull rod (2). A first nut (9) is threaded onto the threaded part (15). The first fixing ring (4) is located between the first nut (9) and the single lip sealing ring (3). The first nut (9) abuts against the first fixing ring (4).

3. The segmental beam precast pre-buried duct leak-proof grout system according to claim 2, characterized in that, The first fixing ring (4) includes a first ring structure (12) sleeved on the outside of the rubber pull rod (2). The first ring structure (12) abuts against the end of the single lip sealing ring (3). At least two first ear seats (13) are connected to the first ring structure (12) protruding outward. The first ear seat (13) is provided with a second through hole (14). The first ear seat (13) corresponds to the connecting rod (7) one by one. The connecting rod (7) passes through the second through hole (14). The first ear seat (13) is located between the first nut (9) and the first structure (1). The first nut (9) can push the first ear seat (13).

4. The segmental beam precast pre-buried duct leak-proof grout system according to claim 3, characterized in that, The sidewall of the first annular structure (12) is inclined relative to the outer wall of the rubber pull rod (2), so that an annular cavity (19) is formed between the sidewall of the first annular structure (12) and the outer wall of the rubber pull rod (2).

5. The segmental beam precast pre-buried duct leak-proof grout system according to claim 4, characterized in that, An annular sealing ring (5) is provided inside the annular cavity (19).

6. The precast embedded duct anti-leakage system for segmental beams according to claim 5, characterized in that, The end of the annular sealing ring (5) away from the single-lip sealing ring (3) protrudes from the annular cavity (19).

7. The segmental beam precast pre-buried duct leak protection system according to claim 6, characterized in that, Also includes: The second fixing ring (6) is sleeved on the outside of the rubber pull rod (2), and the second fixing ring (6) abuts against the end of the annular sealing ring (5) away from the single lip sealing ring (3); The second connecting device (8) can drive the second fixing ring (6) to move along the length direction of the rubber pull rod (2) toward the single lip sealing ring (3).

8. The segmental beam precast pre-buried duct leak-proof grout system according to claim 7, characterized in that, The second connecting device (8) includes a second nut that is threaded into the threaded part (15). The second fixing ring (6) includes a second ring structure (21) sleeved on the outside of the rubber pull rod (2). The second ring structure (21) abuts against the end of the annular sealing ring (5) away from the single lip sealing ring (3). At least two second ear seats (22) are connected to the second ring structure (21) protruding outward. A third through hole (23) is provided on the second ear seat (22). A corresponding connecting rod (7) passes through the third through hole (23). The second ear seat (22) is located between the second nut and the first nut (9). The second nut can push the second ear seat (22).

9. The segmental precast beam pre-buried duct leak-proof system according to any one of claims 2-8, characterized in that, The connecting rod (7) includes a first rod portion (18), a second rod portion (16), and a third rod portion (17). The ends of the first rod portion (18), the second rod portion (16), and the third rod portion (17) are connected to form a T-shaped structure. The threaded portion (15) is connected to the first rod portion (18), the second rod portion (16), and the third rod portion (17). The first rod portion (18), the second rod portion (16), and the third rod portion (17) are all connected to the first structure (1).

10. The segmental precast pre-buried duct leak-proof system according to any one of claims 1-8, characterized in that, The first structure (1) is a plate structure.

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