Upper and lower bisection pipe segment structure suitable for rectangular tunnels

Abstract

A pipe segment structure suitable for rectangular tunnels, wherein the pipe segment structure is formed by splicing an upper pipe segment and a lower pipe segment, wherein the lower end of the upper pipe segment and the upper end of the lower pipe segment form a splicing surface, and the front and rear ends of the upper pipe segment and the lower pipe segment respectively reserve rubber sealing ring installation steel bars and F-shaped socket steel plates, and the lower end of the upper pipe segment and the upper end of the lower pipe segment reserve steel bars, and high-performance concrete is poured between the splicing surfaces of the upper pipe segment and the lower pipe segment to form a UHPC post-cast strip, and a U-shaped groove is reserved on the inner side of the splicing surface of the upper pipe segment and the lower pipe segment for installing a U-shaped water-expandable rubber strip, and one end of the U-shaped groove extends to the inner side of the rubber sealing ring installation steel bar, and the other end extends to the inner side of the F-shaped socket steel plate. The pipe segment of the present invention is composed of upper and lower blocks, which are first prefabricated in a factory, transported to the site, and then positioned and assembled, and high-performance concrete is poured at the connection. In the above manner, the size and weight of a single pipe segment can be greatly reduced, and production and transportation are convenient.

Description

Technical Field

[0001] The invention relates to a rectangular jacking tunnel, in particular to an upper and lower bisected pipe segment structure of a rectangular tunnel suitable for a large-section rectangular tunnel. Background Art

[0002] Underground space resources are limited resources, but also strategic space resources for achieving sustainable development of urban construction. Compared with traditional circular cross-section tunnels, large-section rectangular jacking tunnels have the following significant advantages:

[0003] 1) Advantages of trenchless construction: Rectangular pipe jacking tunnel is constructed by trenchless construction, which can minimize the impact of underground space construction on the surrounding environment;

[0004] 2) Space utilization advantage: Compared with the circular section, the effective use area of ​​the rectangular tunnel section saves more than 20%, and even up to 45%;

[0005] 3) Construction depth advantage: To achieve the same required building layout, the diameter of the circular shield is very large, and its construction depth is much greater than that of the rectangular shield tunnel, resulting in a higher construction cost;

[0006] 4) Advantages for future development: Circular cross-section shield tunnels have a high occupancy rate for underground space, while rectangular tunnels with a smaller space occupancy rate can reserve more space for future underground development;

[0007] 5) Section cutting volume advantage: Compared with circular section tunnels, rectangular tunnels have smaller cutting volume, less mud volume discharged, less impact on the environment, and more environmentally friendly construction;

[0008] 6) Advantages of shallow cover construction: In order to meet the anti-floating requirements of the circular tunnel, the cover thickness of the tunnel needs to meet a certain depth, while the buried depth of the rectangular tunnel can be shallower. In this way, the rectangular tunnel will have a lower occupancy rate of underground space resources, the entrance and exit approaches will be shorter, and the construction cost will be lower.

[0009] In summary, rectangular tunnels have extremely high development value and promotion prospects in modern urban construction. At present, large-section rectangular jacking tunnels are all constructed in the form of integral pipe sections. In order to meet the requirements of two-way two-lane traffic, the width of the rectangular tunnel reaches 10m, the height reaches 7.5m, and the single pipe section reaches 80t. Due to its large size and heavy weight, it is difficult to transport and hoist it, and it is subject to certain restrictions in promotion and application. Therefore, it is necessary to optimize the size and weight of the rectangular jacking pipe by dividing it into blocks. Summary of the invention

[0010] The object of the present invention is to provide an upper and lower two-part pipe segment structure suitable for rectangular tunnels based on the above-mentioned deficiencies of the prior art, especially suitable for large-section rectangular tunnels.

[0011] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: an upper and lower two-part pipe segment structure suitable for rectangular tunnels, characterized in that the pipe segment structure is spliced ​​by an upper pipe segment and a lower pipe segment, the lower end of the upper pipe segment and the upper end of the lower pipe segment form a splicing surface, the front and rear ends of the upper pipe segment and the lower pipe segment are respectively reserved with a rubber sealing ring installation steel bar and an F-type socket steel plate, the lower end of the upper pipe segment and the upper end of the lower pipe segment are reserved with steel bars, high-performance concrete is poured between the splicing surfaces of the upper pipe segment and the lower pipe segment to form a UHPC post-cast strip, a U-shaped groove is reserved on the inner side of the splicing surface of the upper pipe segment and the lower pipe segment for installing a U-shaped water-expandable rubber strip, one end of the U-shaped groove extends to the inner side of the rubber sealing ring installation steel bar, and the other end extends to the inner side of the F-type socket steel plate; an eagle-beak rubber strip is installed on the inner side of the reserved rubber sealing ring installation steel bar, and the F A layer of water-swelling rubber layer is embedded inside the U-shaped socket steel plate. One end of the U-shaped water-swelling rubber strip is connected to the installation eagle-beak rubber strip, and the other end is connected to the water-swelling rubber layer. The U-shaped water-swelling rubber strip, the eagle-beak rubber strip and the water-swelling rubber layer form a closed, all-round waterproof system.

[0012] Furthermore, an interface agent is applied on the joint surface of the upper pipe section and the lower pipe section to improve the waterproof performance.

[0013] Furthermore, polyurea material is applied to the corresponding area outside the UHPC post-cast strip to form external waterproofing.

[0014] The pipe segment of the present invention is composed of two blocks, the upper and lower blocks, which are first prefabricated in the factory, transported to the site, and then positioned and assembled, and high-performance concrete is poured at the joints. In the above manner, the size and weight of a single pipe segment can be greatly reduced, which is convenient for production and transportation. The high-performance concrete at the joint can reach the design strength in about 3 days, and the pipe segment can be used for construction, greatly reducing the requirements for the construction site on site. And through three waterproofing measures, the joints between the high-performance concrete and the prefabricated concrete pipe segments can meet the performance indicators required for waterproofing. The pipe segment after pouring UHPC can be used for pipe segment advancement three days later, which is far better than the 28-day curing requirement of ordinary concrete, can meet rapid construction, reduce the on-site pipe segment yard area, and can be used in urban dense areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a block diagram of the upper and lower two-part pipe section;

[0016] Figure 2 for Figure 1 Side view of

[0017] Figure 3 This is the assembly diagram of the upper and lower two-part pipe section;

[0018] Figure 4 This is a schematic diagram of the structure of waterproof measures at the joints.

[0019] Figure 5 for Figure 4 AA cross-section diagram.

[0020] The figure includes: an upper pipe section 1, a lower pipe section 2, a steel bar 3, a rubber sealing ring mounting steel bar 4, an F-shaped socket steel plate 5, a U-shaped water-swellable rubber strip 6, an interface agent 7, a polyurea material 8, an eagle-beak rubber strip 9, and a water-swellable rubber layer 10. DETAILED DESCRIPTION

[0021] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry.

[0022] As shown in the figure, an upper and lower two-part pipe segment structure suitable for rectangular tunnels is characterized in that the pipe segment structure is spliced ​​by an upper pipe segment 1 and a lower pipe segment 2, the lower end of the upper pipe segment and the upper end of the lower pipe segment form a splicing surface, the front and rear ends of the upper pipe segment and the lower pipe segment are respectively reserved with a rubber sealing ring installation steel bar 4 and an F-type socket steel plate 5, the lower end of the upper pipe segment and the upper end of the lower pipe segment are reserved with a steel bar 3, high-performance concrete is poured between the splicing surfaces of the upper pipe segment and the lower pipe segment to form a UHPC post-cast strip, a horizontally set U-shaped groove is reserved on the splicing surface of the upper pipe segment and the lower pipe segment for installing a U-shaped water-swellable rubber strip, the U-shaped groove opening faces the outer side of the pipe segment, and the U-shaped water-swellable rubber strip is installed in the U-shaped groove, one end of the U-shaped groove extends to the inner side of the rubber sealing ring installation steel bar, and the other end extends to the inner side of the F-type socket steel plate. A hawk-beak rubber strip 9 is installed inside the reserved rubber sealing ring installation steel strip, and a water-swelling rubber layer 10 is embedded inside the F-shaped socket steel plate. One end of the U-shaped water-swelling rubber strip is connected to the installation hawk-beak rubber strip, and the other end is connected to the water-swelling rubber layer.

[0023] Furthermore, an interface agent 7 is coated on the joint surface of the upper pipe section and the lower pipe section to improve the waterproof performance.

[0024] Furthermore, polyurea material 8 is applied to the corresponding area outside the UHPC post-casting strip. As shown in the figure, both ends of the polyurea material should extend to the rubber sealing ring mounting steel bar and the F-type socket steel plate, so as to at least partially overlap with the eagle-beak rubber strip 9 of the rubber sealing ring mounting steel bar and the water-swellable rubber layer 10 on the inner side of the F-type socket steel plate.

[0025] The biggest difference between high-performance concrete UHPC used in underground structures and above-ground structures is the different requirements for waterproof performance. There is a joint between UHPC and the prefabricated concrete pipe section, and the joint is the weak link in the waterproofing of underground projects. At the same time, UHPC is a highly shrinkable material. The key point of this technical solution is to ensure the waterproof performance of the joint between the upper and lower pieces. In order to ensure the waterproof performance of the prefabricated assembled jacking pipe, special treatment of the joint is required. This technical solution adopts three waterproof measures, including polyurea coating, U-shaped water stop strip and interface treatment, such as Figure 3 As shown. Use polyurea material to coat the corresponding area of ​​the UHPC post-casting strip on the outside of the top pipe to form the first waterproof measure; reserve a U-shaped groove with an opening facing the outer side of the pipe section at the joint for installing the U-shaped water-swelling rubber strip. The U-shaped water-swelling rubber strip in the U-shaped groove, the eagle-beak rubber strip, and the water-swelling rubber layer at the bottom of the F-shaped socket steel plate form a closed, all-round waterproof system as the second waterproof measure. At the same time, before pouring the UHPC, an interface agent is used to treat the cross-section of the precast concrete pipe section to improve the waterproof performance and form the third waterproof measure. Through the above comprehensive treatment measures, the joint between the UHPC and the precast concrete pipe section can meet the required waterproof performance indicators.

[0026] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be regarded as limiting the present invention, and the protection scope of the present invention should be defined by the appended claims.

Claims

1. An upper and lower bisection pipe segment structure suitable for rectangular tunnels, characterized in that The pipe segment structure is formed by splicing an upper pipe segment and a lower pipe segment. The lower end of the upper pipe segment and the upper end of the lower pipe segment form a splicing surface. The front and rear ends of the upper pipe segment and the lower pipe segment are respectively reserved with a rubber sealing ring installation steel bar and an F-shaped socket steel plate. The lower end of the upper pipe segment and the upper end of the lower pipe segment are reserved with steel bars. High-performance concrete is poured between the splicing surfaces of the upper pipe segment and the lower pipe segment to form a UHPC post-cast strip. A U-shaped groove with an opening toward the outer side of the pipe segment is reserved on the splicing surface of the upper pipe segment and the lower pipe segment for installing a U-shaped water-expandable rubber strip. One end of the U-shaped groove extends to the inner side of the rubber sealing ring installation steel bar, and the other end extends to the inner side of the F-shaped socket steel plate. An eagle-beak rubber strip is installed on the inner side of the reserved rubber sealing ring installation steel bar. The F A layer of water-swelling rubber layer is embedded inside the U-shaped socket steel plate. One end of the U-shaped water-swelling rubber strip is connected to the installation eagle-beak rubber strip, and the other end is connected to the water-swelling rubber layer. The U-shaped water-swelling rubber strip, the eagle-beak rubber strip and the water-swelling rubber layer form a closed, all-round waterproof system.

2. The upper and lower two-part pipe joint structure according to claim 1, characterized in that: An interface agent is applied on the joint surfaces of the upper pipe section and the lower pipe section to improve the waterproof performance.

3. The upper and lower two-part pipe joint structure according to claim 1, characterized in that: Apply polyurea material to the corresponding area outside the UHPC post-cast strip to form external waterproofing.

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