Prefabricated middle partition wall structure of tunnel ventilation inclined shaft

Abstract

The utility model relates to a prefabricated middle partition wall structure of a tunnel ventilation inclined shaft. The prefabricated middle partition wall structure at least comprises a bottom supporting structure, a steel supporting assembly and a prefabricated modular wallboard. A positioning groove is formed in the top face of the bottom supporting structure, and the bottom of the steel supporting assembly is embedded into the positioning groove and fixed. The prefabricated modular wallboard is formed by splicing a plurality of prefabricated slabs, the adjacent prefabricated slabs are connected through tongue-and-groove structures which are matched in a concave-convex mode, and the tongue-and-groove joints are filled with sealing materials. The steel supporting assemblies are longitudinally arranged at intervals, and the tops of the steel supporting assemblies are fixed to a tunnel lining to form a steel-concrete combined structure for supporting the prefabricated modular wallboard. The steel supporting assembly and the prefabricated modular wall plate form a steel-concrete prefabricated structure, and the stability of the whole structure is enhanced. By adopting the autoclaved aerated concrete precast block material and the concave-convex groove embedded modular structure, the problems that the construction quality is difficult to control, the construction period is long, the on-way resistance of air flow is large and the like in the existing reinforced concrete mid-partition wall are solved.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel engineering technology, specifically relating to a prefabricated assembled central partition wall structure for tunnel ventilation inclined shafts. Background Technology

[0002] In the traditional field of ventilation for extra-long tunnels, horizontal guide shafts, inclined shafts, and vertical shafts are commonly used for ventilation. Inclined shaft materials are required to possess properties such as sealing, smoke resistance, corrosion resistance, ventilation performance, and wind pressure resistance. Currently, reinforced concrete is commonly used for the partition walls of ventilation inclined shafts, but this method has the following significant drawbacks:

[0003] Firstly, the inclined shaft needs to be used as a muck removal channel during the construction of the main tunnel of an extra-long tunnel, which means that the central partition wall can only be constructed after the main tunnel is completed. However, the construction speed of the cast-in-place concrete central partition wall is relatively slow, which seriously restricts the overall construction period of the tunnel.

[0004] Secondly, the inclined shaft has a small clearance cross-section, making vehicle transportation difficult. In addition, the central partition wall is relatively thin, and the construction quality of the thin cast-in-place concrete is difficult to control, which in turn affects the ventilation effect.

[0005] Third, the presence of construction joints in cast-in-place concrete can lead to significant resistance and airflow loss along the left and right ducts.

[0006] The aforementioned problems have led to difficulties in existing reinforced concrete tunnel ventilation structures, including long construction periods, high costs, difficulty in ensuring construction quality, and significant ventilation losses. To further optimize tunnel ventilation structures, and in line with the national green prefabricated design concept, a prefabricated modular central partition wall using new materials is proposed. This solution can reduce airflow resistance and airflow loss while accelerating construction progress and ensuring construction quality. Utility Model Content

[0007] In view of this, the purpose of this utility model is to overcome the shortcomings of existing related technologies and provide a new type of prefabricated tunnel ventilation inclined shaft partition wall structure. The purpose is to overcome the problems of difficult construction quality control, long construction period and large airflow resistance of existing reinforced concrete partition walls by using autoclaved aerated concrete prefabricated block materials and "concave-convex groove" embedded modular structure, thereby improving the sealing performance, construction efficiency and ventilation performance of the partition wall, while conforming to the concept of green prefabricated construction.

[0008] To achieve the above objectives, this utility model provides a prefabricated modular partition wall structure for tunnel ventilation inclined shafts, which is used in tunnel ventilation inclined shafts. The prefabricated modular partition wall structure includes at least a bottom support structure, a steel support assembly, and prefabricated modular wall panels.

[0009] The bottom support structure has a positioning groove on its top surface, and the bottom of the steel support component is embedded in the positioning groove and fixed. The prefabricated modular wall panel is composed of multiple prefabricated panels spliced ​​together. Adjacent prefabricated panels are connected by a tongue-and-groove structure with a convex-concave fit, and the tongue-and-groove joint is filled with sealant. The steel support components are arranged longitudinally at intervals, and their tops are fixed to the tunnel lining to form a steel-concrete composite structure supporting the prefabricated modular wall panel. The steel support components and the prefabricated modular wall panel form a steel-concrete prefabricated structure, which enhances the overall structural stability.

[0010] Furthermore, the bottom support structure is a concrete pier, the positioning groove is a V-shaped positioning groove, and the bottom of the steel support assembly is fixed in the V-shaped positioning groove by concrete pouring.

[0011] Furthermore, the steel support assembly includes galvanized I-beam columns and cross braces, with the galvanized I-beam columns arranged longitudinally at intervals of 5 precast slabs.

[0012] Furthermore, the top of the steel support assembly is fixed to the tunnel concrete lining by L-shaped angle steel and expansion bolts. The top of the steel support assembly is filled with crack-resistant mortar. One side of the angle steel is fixed to the lining, and the other side is pressed against the top of the prefabricated modular wall panel.

[0013] Furthermore, the tongue-and-groove structure is a modular assembly interface, used to reduce airflow resistance and improve ventilation efficiency.

[0014] Furthermore, the sealing material includes a thick resin-based sealant, which is continuously applied along the tongue and groove edge.

[0015] Furthermore, the prefabricated modular wall panel is an autoclaved aerated concrete prefabricated block, with each prefabricated block having a size of 60cm×300cm and a thickness of 12cm. The radius of the tongue and groove structure is 5mm and the angle is 90°.

[0016] This utility model, through prefabricated assembly design and material innovation, significantly overcomes the technical defects of traditional cast-in-place concrete partition walls, with the following specific beneficial effects:

[0017] 1. The present invention can effectively shorten the construction cycle. The prefabricated modular wall panels are produced in a standardized factory and the on-site mechanized assembly process replaces the traditional cast-in-place construction. There is no need to wait for concrete curing, which greatly reduces the on-site operation time and solves the problem of delayed construction of the central partition wall caused by the inclined shaft as a slag discharge channel, thus effectively accelerating the overall construction progress of the tunnel.

[0018] 2. The present invention can effectively improve the construction quality: the prefabricated components are processed with high precision in the factory environment, avoiding common quality problems such as insufficient compaction and honeycomb surface of cast-in-place concrete in the narrow space of the inclined shaft; the steel support components and the prefabricated wall panels form a stable steel-concrete composite structure, which enhances the overall wind pressure resistance and structural reliability of the central partition wall.

[0019] 3. By adopting the present invention, adjacent precast slabs are connected by a tongue-and-groove structure with a convex-concave fit, combined with a sealing material filling process, which significantly reduces the air leakage problem at construction joints, reduces the frictional resistance of airflow in the left and right air ducts, and improves the sealing performance and air volume transmission efficiency of the ventilation system.

[0020] 4. The present invention uses lightweight prefabricated wall panel materials to reduce the structural weight and concrete usage, thereby reducing dust and noise pollution generated by on-site wet operations, which is in line with the national green prefabricated construction concept. At the same time, modular construction reduces the input of manpower and materials, shortens the construction period and reduces the overall cost, resulting in significant economic and environmental benefits.

[0021] 5. The adjustable design of the bottom support structure and the modular layout of the steel support components of this utility model enable it to adapt to the construction needs of ventilation inclined shafts of different heights and cross-sectional dimensions, thereby improving the engineering applicability and site adaptability of the structure. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of the prefabricated partition wall structure of the tunnel ventilation inclined shaft of this utility model;

[0024] Figure 2 This is an elevation view of the prefabricated partition wall structure of the tunnel ventilation inclined shaft of this utility model;

[0025] Figure 3 This is a schematic diagram of the adjacent connection structure of the precast slabs of this utility model;

[0026] Figure 4 This is a schematic diagram of the top structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the bottom structure of this utility model.

[0028] In the diagram: 1. Prefabricated modular partition wall structure; 2. Bottom support structure; 3. Steel support components; 4. Prefabricated modular wall panels; 5. Positioning groove; 6. Angle steel; 7. Tongue and groove structure; 8. Crack-resistant mortar filling; 9. Expansion bolts. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims.

[0030] Example 1

[0031] Please see Figures 1 to 5 As shown, this embodiment provides a prefabricated modular partition wall structure for tunnel ventilation inclined shafts, which is used in tunnel ventilation inclined shafts. The prefabricated modular partition wall structure 1 includes at least a bottom support structure 2, a steel support assembly 3, and a prefabricated modular wall panel 4.

[0032] The bottom support structure 2 has a positioning groove 5 on its top surface, and the bottom of the steel support component 3 is embedded in the positioning groove 5 and fixed. The prefabricated modular wall panel 4 is spliced ​​from multiple prefabricated panels, and adjacent prefabricated panels are connected by a tongue-and-groove structure 7 with a convex-concave fit. The tongue-and-groove joint is filled with sealing material. The steel support component 3 is arranged longitudinally at intervals, and its top is fixed to the tunnel lining to form a steel-concrete composite structure supporting the prefabricated modular wall panel 4. The steel support component 3 and the prefabricated modular wall panel 4 form a steel-concrete prefabricated structure, which enhances the overall structural stability.

[0033] In one embodiment, the bottom support structure 2 is a concrete pier, the positioning groove 5 is a V-shaped positioning groove 5, and the bottom of the steel support component 3 is fixed in the V-shaped positioning groove 5 by filling with crack-resistant mortar 8.

[0034] In one embodiment, the steel support component 3 in this embodiment includes galvanized I-beam columns and cross braces, with the galvanized I-beam columns arranged longitudinally at intervals of 5 precast slabs.

[0035] In one embodiment, the top of the steel support assembly 3 is fixed to the tunnel concrete lining by L-shaped angle steel 6 and expansion bolts 9. The top of the steel support assembly 3 is filled with crack-resistant mortar 8. One side of the angle steel 6 is fixed to the lining, and the other side is pressed against the top of the prefabricated modular wall panel 4.

[0036] As one implementation method, the tongue and groove structure 7 described in this embodiment is a modular assembly interface, which is used to reduce airflow resistance and improve ventilation efficiency.

[0037] In one embodiment, the sealing material includes a thick resin-based sealant, which is continuously applied along the tongue and groove edge.

[0038] In one embodiment, the prefabricated modular wall panel 4 is an autoclaved aerated concrete prefabricated block, with a single prefabricated block size of 60cm×300cm and a thickness of 12cm. The tongue and groove structure 7 has a radius of 5mm and an angle of 90°.

[0039] The main material of this prefabricated partition wall is autoclaved aerated concrete (AAC), a lightweight material known for its high strength, low weight, ease of construction, and excellent fit and quality between prefabricated modules, resulting in superior ventilation and sealing performance. This embodiment marks the first use of a steel-concrete prefabricated structure in a tunnel ventilation shaft. Galvanized I-beams are used as columns and cross braces, while AAC is used as the prefabricated modules. The use of this steel-concrete prefabricated structure significantly reduces the construction period and improves construction quality while ensuring effective ventilation.

[0040] Example 2

[0041] Please see Figures 1 to 5 As shown, this embodiment provides a prefabricated modular partition wall structure for tunnel ventilation inclined shafts. It is constructed from concrete piers, angle steel and expansion bolts, galvanized I-beam columns and cross braces, and autoclaved aerated lightweight prefabricated blocks. This prefabricated modular partition wall structure includes at least a bottom support structure, steel support components, and prefabricated modular wall panels, as detailed below:

[0042] The bottom support structure is a concrete pier with a V-shaped positioning groove on its top surface. The height of the concrete pier can be adjusted appropriately according to the height of the inclined shaft, with a maximum of 50cm. The V-shaped positioning groove on the concrete pier facilitates the installation and positioning of the steel support components during construction. The bottom of the steel support components is embedded in the V-shaped positioning groove and fixed by concrete pouring.

[0043] The steel support assembly includes galvanized I-beam columns and cross braces. The galvanized I-beam columns are spaced five precast panels apart longitudinally to ensure structural stability. The top of the steel support assembly is fixed to the tunnel concrete lining using L-shaped angle steel and expansion bolts. Precast modular wall panels are sandwiched in the middle by bolts and angle steel at the top, ensuring both the fixation of the precast modules and the airtightness of the central partition wall for ventilation.

[0044] The prefabricated modular wall panel is assembled from multiple autoclaved aerated concrete (AAC) precast blocks, each measuring 60cm x 300cm and 12cm thick. Adjacent precast panels are connected by a tongue-and-groove structure with a 5mm radius and a 90° angle, forming a tongue-and-groove embedded modular structure. The tongue-and-groove joint is filled from the inside out with thick crack-resistant mortar and thick resin-based sealant. The crack-resistant mortar fills the gap between the tongue and groove, while the resin-based sealant is continuously applied along the edge of the tongue and groove. This tongue-and-groove structure serves as a modular assembly interface, effectively reducing airflow resistance and improving ventilation efficiency.

[0045] The main material of this prefabricated partition wall is autoclaved aerated concrete, a lightweight material with good strength, low weight, and easy construction. The prefabricated modules in the factory fit together well, have high quality, and better ventilation and sealing performance.

[0046] This patent is the first to use a steel-concrete prefabricated structure in a tunnel ventilation inclined shaft. It uses galvanized I-beams as columns and cross braces, and autoclaved aerated concrete as prefabricated modules. The use of the steel-concrete prefabricated structure greatly reduces the construction period and improves the construction quality while ensuring ventilation effect.

[0047] This embodiment provides a prefabricated modular partition wall structure for tunnel ventilation inclined shafts, which is used in tunnel ventilation inclined shafts. The specific implementation steps and structural details are as follows:

[0048] I. Construction Preparation Stage

[0049] Before construction, a survey and layout were carried out. Using professional surveying instruments, the exact location of the central partition wall in the ventilation shaft was determined, providing a benchmark for subsequent construction.

[0050] II. Construction of the Bottom Support Structure

[0051] Based on the measurement and layout results, the concrete piers for the bottom support structure are constructed. A V-shaped positioning groove is installed on the top surface of the concrete pier for precise positioning of the steel support components. During the pouring of the concrete pier, the shape and dimensions of the V-shaped positioning groove are pre-defined to ensure that parameters such as angle and depth meet design requirements. After the concrete pier reaches the design strength, the bottom of the steel support components, consisting of galvanized I-beam columns and cross braces, is embedded into the V-shaped positioning groove. A second pour of concrete is then used to firmly fix the bottom of the steel support components to the concrete pier, forming a stable foundation support structure.

[0052] III. Installation of Steel Support Components

[0053] The steel support assembly includes galvanized I-beam columns and cross braces. As per design requirements, a galvanized I-beam column is installed every five precast slabs longitudinally. During installation, the galvanized I-beam columns are first accurately placed into the V-shaped positioning grooves of the concrete pier, ensuring that the verticality and spacing of the columns meet design standards. Then, the cross braces are installed, connecting the columns into a stable frame structure to enhance overall support performance.

[0054] IV. Installation of Prefabricated Modular Wall Panels

[0055] In this embodiment, the prefabricated modular wall panels are made of autoclaved aerated concrete (AAC) precast blocks, each measuring 60cm x 300cm and 12cm thick. Adjacent precast panels are connected by a tongue-and-groove joint with a radius of 5mm and an angle of 90°. During installation, the precast blocks are sequentially embedded between the I-beam columns, ensuring a tight fit between adjacent blocks. After each precast block is installed, the tongue-and-groove joints are immediately filled with sealant. The sealant consists of 15mm thick crack-resistant mortar and 1mm thick resin-based sealant. The crack-resistant mortar is first filled into the tongue-and-groove gap, compacted, and smoothed. After the crack-resistant mortar has initially solidified, the resin-based sealant is continuously applied along the edge of the tongue-and-groove joint to form a complete sealing layer, preventing air leakage during ventilation.

[0056] V. Installation of Top Fixing Structure

[0057] The top of the steel support assembly is fixed to the tunnel concrete lining using L-shaped angle steel and expansion bolts. During installation, one side of the L-shaped angle steel is first firmly fixed to the tunnel concrete lining with expansion bolts to ensure accurate positioning and secure fixation. Then, the other side is pressed against the top of the prefabricated modular wall panel and further tightened with bolts, ensuring a tight connection between the prefabricated wall panel and the tunnel lining. This not only guarantees the stability of the central partition wall but also enhances the sealing of the ventilation system.

[0058] Through the above construction steps, the prefabricated modular central partition wall structure of the tunnel ventilation shaft is finally completed. This structure, through the synergistic effect of the bottom support structure, steel support components, and prefabricated modular wall panels, forms a stable steel-concrete prefabricated structure. Compared with traditional central partition wall structures, it offers significant improvements in construction efficiency, structural stability, and ventilation performance, and aligns with the concept of green prefabricated construction. Furthermore, during construction, the panels can be flexibly adjusted according to the actual site conditions. If necessary, the autoclaved aerated concrete prefabricated blocks can be replaced with other lightweight materials to meet different project requirements.

[0059] Compared with the prior art, the present invention has the following significant advantages:

[0060] The use of autoclaved aerated concrete (AAC) and prefabricated structures reduces the thickness of the partition wall from 30cm to 12cm, saving a significant amount of concrete and meeting the "material conservation" requirement in green construction. Mechanized assembly of the panels saves considerable manpower and resources, meeting the "energy conservation" requirement in green construction. Factory prefabrication is more environmentally friendly than cast-in-place concrete, thus meeting the "environmental protection" requirement in green construction. Therefore, the promotion of prefabricated partition walls aligns with my country's green construction philosophy.

[0061] By optimizing the construction process, ventilation shafts of different heights can be freely adjusted by adjusting the height of the concrete piers, making them more applicable; the design of the top angle steel and expansion bolts can speed up the construction process and achieve a tight seal; the flat "V" design of the bottom concrete pier can better facilitate construction.

[0062] The autoclaved aerated concrete (AAC) lightweight precast assembly technology and concept have further promoted the prefabricated construction process in the highway industry. The combination of prefabricated technology and new materials not only meets the usage requirements, but also shortens the construction period and saves manpower and resources. The use and promotion of new materials and new technologies actively respond to the national call for green environmental protection, energy conservation and emission reduction, and push the prefabricated design and construction of my country's highway tunnel industry to a new level.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A prefabricated modular partition wall structure for a tunnel ventilation inclined shaft, characterized in that, It is used in tunnel ventilation inclined shafts, and the prefabricated assembled central partition wall structure includes at least a bottom support structure, steel support components and prefabricated modular wall panels; The bottom support structure has a positioning groove on its top surface, and the bottom of the steel support component is embedded in the positioning groove and fixed. The prefabricated modular wall panel is composed of multiple prefabricated panels spliced ​​together. Adjacent prefabricated panels are connected by a tongue-and-groove structure with a convex-concave fit, and the tongue-and-groove joint is filled with sealant. The steel support components are arranged longitudinally at intervals, and their tops are fixed to the tunnel lining to form a steel-concrete composite structure supporting the prefabricated modular wall panel. The steel support components and the prefabricated modular wall panel form a steel-concrete prefabricated structure, which enhances the overall structural stability.

2. The prefabricated modular partition wall structure for tunnel ventilation inclined shafts according to claim 1, characterized in that, The bottom support structure is a concrete pier, the positioning groove is a V-shaped positioning groove, and the bottom of the steel support component is fixed in the V-shaped positioning groove by concrete pouring.

3. The prefabricated modular partition wall structure for tunnel ventilation inclined shafts according to claim 2, characterized in that, The steel support assembly includes galvanized I-beam columns and cross braces, with the galvanized I-beam columns arranged longitudinally at intervals of 5 precast slabs.

4. The prefabricated modular partition wall structure for tunnel ventilation inclined shafts according to claim 3, characterized in that, The top of the steel support assembly is fixed to the tunnel concrete lining by L-shaped angle steel and expansion bolts. The top of the steel support assembly is filled with crack-resistant mortar. One side of the angle steel is fixed to the lining, and the other side is pressed against the top of the prefabricated modular wall panel.

5. The prefabricated modular partition wall structure for tunnel ventilation inclined shafts according to claim 1, characterized in that, The tongue-and-groove structure is a modular assembly interface used to reduce airflow resistance and improve ventilation efficiency.

6. The prefabricated modular partition wall structure for tunnel ventilation inclined shafts according to any one of claims 1 to 4, characterized in that, The sealing material includes a thick resin-based sealant, which is continuously applied along the tongue and groove edge.

7. The prefabricated modular partition wall structure for tunnel ventilation inclined shafts according to claim 6, characterized in that, The prefabricated modular wall panel is an autoclaved aerated concrete prefabricated block, with each prefabricated block measuring 60cm × 300cm and 12cm thick. The tongue and groove structure has a radius of 5mm and an angle of 90°.

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