Sealing structure for reserved holes for future expansion of cable wells

Abstract

The present invention relates to a sealing structure for reserved holes for future expansion of cable wells, which includes a force-bearing support system, a plain concrete wall, and a joint waterproofing system; a part of the force-bearing support system is embedded in the tunnel wall of the branch tunnel, and the other part is arranged in the reserved hole; the plain concrete wall is arranged on the side of the force-bearing support system away from the cable well and connected to the tunnel wall of the branch tunnel; the joint waterproofing system is arranged between the plain concrete wall and the tunnel wall of the branch tunnel. The force-bearing support system includes embedded parts, anchor bars, a first support part, and a second support part; the embedded parts are at least partially embedded in the tunnel wall of the branch tunnel where the reserved hole is located; the anchor bars are connected to the embedded parts and embedded in the tunnel wall of the branch tunnel where the reserved hole is located; the first support part is arranged in the reserved hole and fixedly connected to the embedded parts; the second support part is arranged in the reserved hole and fixedly connected to the first support part. The present invention is safe and reliable, and is convenient for construction.

Description

Technical Field

[0001] The invention belongs to the technical field of power cable construction, and in particular relates to a sealing structure suitable for a reserved hole reserved for future expansion in a cable well. Background Art

[0002] According to the requirements for laying power cables, a multi-channel cable well (cable inspection well or branch well) must be set up at a certain distance (generally not more than 100m) along the length of the power cable route. The internal clearance of the cable well must meet the needs of cable laying and maintenance.

[0003] When constructing a cable well, since the long-term laying scale of many projects is not determined, it is necessary to reserve reserved holes for future expansion at one or more branches of the cable well. The reserved holes need to be blocked when not in use, and the original but unsuitable holes are chiseled out according to the expansion scale when they are expanded in the future. This construction method is not only difficult to construct, but also affects the safety of the laid power cables. At the same time, there is leakage in the reserved holes, so the reserved expansion holes often become a difficult point in the quality control of urban cable projects. Summary of the invention

[0004] The purpose of the present invention is to provide a sealing hole structure for reserved holes for future expansion of a cable well, which has the advantages of convenient expansion construction, safe structure and reliable waterproofing.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A sealing structure for a reserved hole for future expansion of a cable well is provided at a reserved hole designed for future expansion in a branch tunnel of a cable well. The sealing structure for a reserved hole for future expansion of a cable well comprises:

[0007] A force-bearing support system, a part of which is pre-buried in the tunnel wall of the branch tunnel where the reserved hole is located, and another part of which is arranged in the reserved hole;

[0008] A plain concrete wall, which is arranged on a side of the force-bearing support system away from the cable well and connected to a tunnel wall of the branch tunnel;

[0009] A joint waterproofing system is provided between the plain concrete wall and the tunnel wall of the branch tunnel.

[0010] The force support system comprises:

[0011] An embedded part, wherein the embedded part is at least partially embedded in the tunnel wall of the branch tunnel where the reserved hole is located, and the embedded part has a mounting surface flush with the inner surface of the tunnel wall or located in the reserved hole;

[0012] Anchor bars, the anchor bars are connected to the embedded parts and embedded in the tunnel wall of the branch tunnel where the reserved hole is located;

[0013] A first support member, which is disposed in the reserved hole and fixedly connected to the mounting surface of the embedded member;

[0014] A second support member is disposed in the reserved hole and fixedly connected to the first support member, and a length direction of the second support member is perpendicular to a length direction of the first support member.

[0015] The embedded part is a steel plate.

[0016] The first support member is a column longitudinally arranged in the reserved hole, and the second support member is a load-bearing beam transversely arranged in the reserved hole.

[0017] The column is a U-shaped column with a groove, and the end of the second support member is inserted into the groove and fixed.

[0018] The load-bearing crossbeam is a rectangular hollow square tube.

[0019] The first support member is welded to the embedded member, and the second support member is bolted to the first support member.

[0020] A rigid waterproof layer is arranged on the water-facing side of the plain concrete wall.

[0021] The joint waterproofing system includes a plurality of water-swellable rubber strips arranged between the plain concrete wall and the tunnel wall of the branch tunnel.

[0022] The sealing structure for the reserved hole for the future expansion of the cable well also includes a waterproof steel plate embedded in the end of the tunnel wall of the branch tunnel.

[0023] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the present invention can safely and reliably seal the reserved holes, is convenient for expansion construction, is easy to use, and can greatly improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 This is an overall bird's-eye view of the cable shaft before expansion.

[0025] Attached Figure 2 This is an enlarged top view of the reserved hole A in the cable shaft before expansion.

[0026] Attached Figure 3 This is an enlarged front view of the reserved hole A in the cable shaft before expansion.

[0027] Attached Figure 4 This is an enlarged top view of the reserved hole A in the expanded cable shaft.

[0028] In the above attached figures: 1. Cable manhole; 2. Reserved hole on the cable conduit side; 3. Reserved hole on the cable trench side; 4. Embedded parts; 5. Anchor bars; 6. First support member; 7. Second support member; 8. Plain concrete wall; 9. Water-swelling rubber strip; 10. Waterproof steel plate; 11. Water-swelling rubber strip; 12. Reinforced concrete end plate; 13. Cable wall bushing; 14. Tunnel wall. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0030] Embodiment 1: As shown in the attached Figure 1 As shown, the cable pit 1 includes a main part and a branch part formed by the main part branching outwards. The branch part includes a branch tunnel. Figure 1 The figure shows a three-way well, which has three branches, two of which are respectively provided with cable pipes and cable trenches, i.e., reserved holes 2 on the cable pipe side and reserved holes 3 on the cable trench side, while the other branch side is reserved for future expansion and has reserved holes. The reserved holes are reserved in full cross-section, i.e., the size of the reserved holes is consistent with the internal clearance size at the branch of the cable well 1.

[0031] As attached Figure 2 and attached Figure 3 As shown, the sealing structure used for the above-mentioned reserved holes includes three parts: a force support system, a plain concrete wall 8 and a joint waterproofing system.

[0032] Part of the force support system is embedded in the tunnel wall 14 of the branch tunnel where the reserved hole is located, and the other part is arranged in the reserved hole. Specifically, the force support system includes embedded parts 4, anchor bars 5, a first support member 6 and a second support member 7. The embedded parts 4 are at least partially embedded in the tunnel wall 14 of the branch tunnel where the reserved hole is located, and the embedded parts 4 have a mounting surface that is flush with the inner surface of the tunnel wall 14 or located in the reserved hole. In this embodiment, two embedded parts 4 are provided and are relatively arranged on the left and right sides of the tunnel wall 14. The embedded parts 4 are made of steel plates, and one side surface thereof is flush with the inner surface of the tunnel wall 14. The anchor bars 5 are connected to the embedded parts 4, and each embedded part 4 has a plurality of anchor bars 5. The anchor bars 5 are completely embedded in the tunnel wall 14 of the branch tunnel where the reserved hole is located. The embedded parts 4 and their anchor bars 5 are cast together with the tunnel wall 14. The first support member 6 is arranged in the reserved hole and fixedly connected to the mounting surface of the embedded part 4. The second support member 7 is arranged in the reserved hole and fixedly connected to the first support member 6, and the length direction of the second support member 7 is perpendicular to the length direction of the first support member 6. In this embodiment, two first support members 6 are arranged and respectively connected to two embedded members 4, and the first support member 6 is welded to the corresponding embedded members 4. The first support member 6 is a column longitudinally arranged in the reserved hole, and the column is a U-shaped column with a groove. A plurality of (5) second support members 7 are arranged, and the two ends of the second support member 7 are bolted to the two first support members 6 respectively. The second support member 7 is a load-bearing crossbeam transversely arranged in the reserved hole, which can be a rectangular hollow square tube, and the end of the second support member 7 is inserted into the groove of the first support member 6 and fixed. The load-bearing support system of the steel structure needs to fully bear the effect of the water and soil pressure on the outside.

[0033] The plain concrete wall 8 is arranged on the side of the force support system away from the main body of the cable well 1 and connected to the tunnel wall 14 of the branch tunnel. Its thickness is about 250mm. The plain concrete wall 8 is cast with self-waterproof concrete, and the anti-seepage grade is not less than P6. A rigid waterproof layer is arranged on the water-facing side of the plain concrete wall 8.

[0034] The joint waterproofing system is arranged between the plain concrete wall 8 and the tunnel wall 14 of the branch tunnel, and includes several (such as two) water-swellable rubber strips 9 arranged between the plain concrete wall 8 and the tunnel wall 14 of the branch tunnel, so that the waterproofing level of the plain concrete wall 8 as a whole is not lower than that of the main structure of the working well.

[0035] In addition, the sealing structure of the reserved hole for the future expansion of the cable well 1 also includes a waterproof steel plate 10 embedded in the ends of the tunnel wall 14 of the branch tunnel to reserve for secondary pouring.

[0036] The structural approach before the expansion of the above-mentioned sealing hole structure is as follows: ① The embedded parts 4, anchor bars 5, and waterproof steel plates 10 of the load-bearing support system are cast together with the tunnel wall 14 structure to form a branch tunnel → ② After the tunnel wall 14 structure is cast, the U-shaped columns of the load-bearing support system are welded → ③ The rectangular hollow square tubes for lateral force are installed → ④ The water-expanding rubber strips are installed, and the plain concrete wall 8 with a thickness of 250 mm is cast and a rigid waterproof layer is applied on the water-facing side → ⑤ The exposed waterproof steel plate 10 is wrapped with asphalt hemp and the like for protection → ⑥ The foundation soil outside the reserved hole is backfilled and compacted.

[0037] As attached Figure 4 As shown in the figure, the construction method for the expansion of the reserved hole is as follows: ① dig a trench at the position of the hole opening for the work well expansion, and use foundation pit support structures such as steel sheet piles when necessary → ② manually remove and dismantle the 250mm thick plain concrete wall 8 → ③ remove the rectangular hollow square tube and its connecting bolts in the steel structure support system → ④ remove the protective measures on the side of the reserved waterproof steel plate 10, such as asphalt hemp, etc. → ⑤ cast the expanded side wall structure, that is, the permanent reinforced concrete end plate 12, containing various types of holes that need to be reserved, and can install a number of required cable wall sleeves 13, etc., and a water-expandable rubber strip 11 is also set between the reinforced concrete end plate 12 and the tunnel wall 14 → ⑦ After the expansion channel outside the work well is completed, backfill and compact the foundation soil.

[0038] In the above scheme, the reserved openings of the cable three-way shaft and four-way shaft for the future reserved expansion channels are reserved as a whole to meet various possibilities of future expansion; the reserved openings adopt the method of embedded 4+ steel internal support for overall force bearing, plain concrete wall retaining and waterproofing to facilitate the expansion construction and minimize the safety impact of the expansion on the running cables; the main components of the steel structure force system are spliced ​​with bolts for easy disassembly; the expansion construction adopts an integral cast-in-one method to meet the requirements of secondary waterproofing.

[0039] Compared with the existing cable well 1 reserved hole solution, the above solution has the following advantages:

[0040] 1. The overall opening reservation method is adopted. Compared with the existing method of reserving small openings, it can meet the needs of various laying plans for long-term expansion;

[0041] 2. Avoid manual cutting and drilling of reinforced concrete wall panels and waterproofing and plugging of small holes, reduce the difficulty of expansion construction and avoid leakage problems after expansion;

[0042] 3. The use of a prefabricated internal support structure system and a plain concrete structure that does not require reinforcement further reduces the difficulty of expansion construction and reasonably reduces the impact on the safety of existing cables.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing structure for a reserved hole for future expansion of a cable well, which is arranged at a reserved hole designed for future expansion in a branch tunnel of a cable well, and is characterized by: The sealing structure for the reserved hole for the future expansion of the cable well comprises: A force-bearing support system, a part of which is pre-buried in the tunnel wall of the branch tunnel where the reserved hole is located, and another part of which is arranged in the reserved hole; A plain concrete wall, which is arranged on a side of the force-bearing support system away from the cable well and connected to a tunnel wall of the branch tunnel; A joint waterproofing system, the joint waterproofing system is arranged between the plain concrete wall and the tunnel wall of the branch tunnel; The force support system comprises: An embedded part, wherein the embedded part is at least partially embedded in the tunnel wall of the branch tunnel where the reserved hole is located, and the embedded part has a mounting surface flush with the inner surface of the tunnel wall or located in the reserved hole; Anchor bars, the anchor bars are connected to the embedded parts and embedded in the tunnel wall of the branch tunnel where the reserved hole is located; A first support member, which is disposed in the reserved hole and fixedly connected to the mounting surface of the embedded member; A second support member is disposed in the reserved hole and fixedly connected to the first support member, and a length direction of the second support member is perpendicular to a length direction of the first support member.

2. The sealing structure for reserved holes for future expansion of cable wells according to claim 1 is characterized in that: The embedded part is a steel plate.

3. The sealing structure for reserved holes for future expansion of cable wells according to claim 1 is characterized in that: The first support member is a column longitudinally arranged in the reserved hole, and the second support member is a load-bearing beam transversely arranged in the reserved hole.

4. The sealing structure for reserved holes for future expansion of cable wells according to claim 3 is characterized in that: The column is a U-shaped column with a groove, and the end of the second support member is inserted into the groove and fixed.

5. The sealing structure for reserved holes for future expansion of cable wells according to claim 3 is characterized in that: The load-bearing crossbeam is a rectangular hollow square tube.

6. The sealing structure for reserved holes for future expansion of cable wells according to claim 1 is characterized in that: The first support member is welded to the embedded member, and the second support member is bolted to the first support member.

7. The sealing structure for reserved holes for future expansion of cable wells according to claim 1 is characterized in that: A rigid waterproof layer is arranged on the water-facing side of the plain concrete wall.

8. The sealing structure for reserved holes for future expansion of cable wells according to claim 1 is characterized in that: The joint waterproofing system includes a plurality of water-swellable rubber strips arranged between the plain concrete wall and the tunnel wall of the branch tunnel.

9. The sealing structure for reserved holes for future expansion of cable wells according to claim 1 is characterized in that: The sealing structure for the reserved hole for the future expansion of the cable well also includes a waterproof steel plate embedded in the end of the tunnel wall of the branch tunnel.

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