A formwork-free large-span manhole cover beam-slab assembly structure

Abstract

This utility model relates to the field of manhole cover beam assembly technology, specifically disclosing a formwork-free large-span manhole cover beam assembly structure, including: a formwork-free template and an I-beam support beam. The formwork-free template is erected on top of the I-beam support beam and connected to it; lateral support structures are symmetrically arranged on both sides of the I-beam support beam and are detachably connected to it. This formwork-free large-span manhole cover beam assembly structure has the advantages of structural stability and easy installation, greatly saving construction time and costs. The use of the formwork-free template avoids the cumbersome steps of traditional formwork, improving construction efficiency. At the same time, the design of the I-beam support beam and lateral support structure enhances the overall structural load-bearing capacity and stability, ensuring the safe use of the manhole cover beam.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover beam assembly technology, and in particular to a large-span manhole cover beam assembly structure that does not require formwork. Background Technology

[0002] In current municipal infrastructure construction, with the increasing vertical development of urban space, the application of deep wells and large-span structures in underground engineering is growing, especially in projects such as communication hubs, integrated utility tunnels, and ultra-deep drainage wells, where well depths can reach 60 meters and well opening spans can exceed 36 meters. In existing technologies, well opening closure structures typically employ cast-in-place beam-slab systems or integral casting after formwork erection. These methods are applicable to small- to medium-scale projects. However, under special engineering conditions such as deep wells and large spans, traditional formwork operations face numerous practical difficulties: firstly, the depth and size of the well opening limit the ability to establish a continuous and effective support system; secondly, high-altitude operations pose significant safety risks, have long construction cycles, and involve complex procedures; and thirdly, the space for large machinery hoisting operations is limited, hindering efficient construction. Furthermore, these structures typically do not bear pedestrian or vehicle loads, with structural self-weight and long-term stability being the primary control factors. Traditional design methods and construction techniques for municipal manhole covers or well opening beam-slab structures are insufficient to meet the project requirements.

[0003] Therefore, how to solve the problems of the existing technology in dealing with complex conditions such as deep wells and large spans, such as the inability to quickly close the structure, the difficulty of construction organization, and the poor safety of the formwork system, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, this utility model proposes a formwork-free large-span manhole cover beam assembly structure to address the shortcomings of existing technologies. It aims to solve the problems of the inability to quickly close the structure, the difficulty of construction organization, and the poor safety of the formwork system when facing complex conditions such as deep wells and large spans.

[0005] This utility model provides a formwork-free, large-span manhole cover beam-slab assembly structure, comprising:

[0006] The formwork is designed to be removed and is connected to the I-beam support beam.

[0007] The lateral support structure is symmetrically arranged on both sides of the I-beam support beam and is detachably connected to the I-beam support beam.

[0008] Furthermore, the dimensions of the removable formwork are 1500mm×1900mm, the thickness is 40mm, and it is internally configured with HRB400 steel bars with a spacing of 75mm and a diameter of 6mm.

[0009] Furthermore, the non-removable template also includes lifting rings and through holes; the through holes are symmetrically opened in the middle of the non-removable template, and the two ends of the lifting rings pass through the through holes and are detachably connected to the non-removable template by fixing bolts.

[0010] Furthermore, the I-beam support beam is internally embedded with an I-beam, which includes an upper flange longitudinal bar, a lower flange longitudinal bar, and a web longitudinal bar. The upper flange longitudinal bar and the lower flange longitudinal bar are respectively located at the upper and lower ends of the I-beam, and the web longitudinal bar is fixedly connected between the upper flange longitudinal bar and the lower flange longitudinal bar.

[0011] Furthermore, the lateral support structure includes:

[0012] A pad stone is placed at the bottom of the I-beam support beam, and the pad stone is fixedly connected to the I-beam support beam.

[0013] A steel plate is disposed at the bottom of the pad stone, and the steel plate is fixedly connected to the pad stone;

[0014] Diagonal braces are installed on both sides of the I-beam support beam. One end of the diagonal brace is connected to the bottom of the upper flange of the I-beam support beam, and the other end of the diagonal brace is fixed to the steel plate by expansion bolts.

[0015] Furthermore, the angle between the diagonal brace and the steel plate is 70°.

[0016] Furthermore, the lateral support structure also includes:

[0017] A pad is disposed between the bottom of the upper flange of the I-beam support beam and the diagonal brace, and the pad is fixedly connected to the I-beam support beam.

[0018] Furthermore, the pad includes a steel plate layer and a rubber layer, the steel plate layer and the rubber layer being fixedly connected; the rubber layer is connected to the I-beam support beam.

[0019] Furthermore, the steel plate layer has a thickness of 15mm, and the rubber layer has a thickness of 5mm.

[0020] Furthermore, the I-beam support beam includes a first support beam, a second support beam, a third support beam, a fourth support beam, a fifth support beam, a sixth support beam, and a seventh support beam; the lengths of the first support beam, the second support beam, the third support beam, the fourth support beam, the fifth support beam, the sixth support beam, and the seventh support beam are all different.

[0021] Compared with existing technologies, the advantages of this utility model are that the large-span manhole cover beam assembly structure without formwork provided by this utility model has the advantages of structural stability and simple installation, which greatly saves construction time and costs. The use of formwork-free installation avoids the cumbersome steps of traditional formwork and improves construction efficiency. At the same time, the design of the I-beam support beam and lateral support structure enhances the load-bearing capacity and stability of the overall structure, ensuring the safe use of the manhole cover beam. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the formwork-free large-span manhole cover beam assembly structure of this utility model.

[0023] Figure 2 This is a schematic diagram showing the position of the I-beam support beam in the formwork-free large-span manhole cover beam assembly structure of this utility model.

[0024] Figure 3 This is a schematic diagram of the formwork structure for the formwork-free large-span manhole cover beam-slab assembly structure of this utility model.

[0025] Figure 4 This is a schematic diagram showing the installation position of the formwork and lifting rings for the formwork-free large-span manhole cover beam assembly structure of this utility model.

[0026] In the diagram: 100, No-removal template; 110, Lifting ring; 120, Through hole; 130, Fixing bolt; 200, I-beam support beam; 210, First support beam; 220, Second support beam; 230, Third support beam; 240, Fourth support beam; 250, Fifth support beam; 260, Sixth support beam; 270, Seventh support beam; 300, Lateral support structure; 310, Pad stone; 320, Steel plate; 330, Diagonal brace; 340, Expansion bolt; 350, Pad block. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] See Figure 1-4 As shown, this embodiment provides a formwork-free large-span manhole cover beam-slab assembly structure, including:

[0032] The formwork 100 is installed on top of the I-beam support beam 200, and the formwork 100 is connected to the I-beam support beam 200.

[0033] The lateral support structure 300 is symmetrically arranged on both sides of the I-beam support beam 200 and is detachably connected to the I-beam support beam 200.

[0034] It is understandable that the formwork-free large-span manhole cover beam assembly structure provided in this embodiment has the advantages of structural stability and simple installation, greatly saving construction time and costs. The use of the formwork-free 100 avoids the cumbersome steps of traditional formwork and improves construction efficiency. At the same time, the design of the I-beam support beam 200 and the lateral support structure 300 enhances the load-bearing capacity and stability of the overall structure, ensuring the safe use of the manhole cover beam.

[0035] Specifically, the dimensions of the non-removable formwork 100 are 1500mm × 1900mm, with a thickness of 40mm, and it is internally configured with HRB400 steel bars with a spacing of 75mm and a diameter of 6mm.

[0036] In this embodiment, the formwork 100 is made of UHPC150 ultra-high performance concrete precast slab. After the I-beam support beam 200 and the formwork 100 are erected, the cast-in-place layer is constructed. The cast-in-place floor slab is made of C35 waterproof concrete with a thickness of 120mm.

[0037] In this embodiment, the cement used to prepare UHPC is ordinary Portland cement or Portland cement with stable quality, an alkali content of no more than 0.60%, and a C3A content in the clinker of no more than 8.0%. Other technical requirements comply with GB-175. The fly ash used is Grade I fly ash, granulated blast furnace slag powder of grade S95 or higher, and steel slag powder of grade G85 or higher. The fine aggregate complies with the current national standard "Construction Sand" (GB / T 14684), where the mud content, stone powder content, mud lump content, harmful substance content, and soundness should meet Class I requirements. The aggregate should preferably be single-grained quartz sand and quartz powder. The steel fibers should be high-strength microfibers with an aspect ratio controlled at 60~100. According to the "Technical Specification for Prestressed Ultra-High Performance Concrete Beam Bridges without Web Reinforcement" (T / GDHS 003-2021), the main design parameters of UHPC150 concrete are shown in Table 1.

[0038]

[0039] Understandably, the use of the No-Removal Formwork 100 not only simplifies the construction process, but also effectively improves the overall quality and service life of the manhole cover beams and slabs due to its excellent material properties, such as high strength, durability and impermeability.

[0040] Specifically, the non-removable template 100 also includes a lifting ring 110 and a through hole 120; the through hole 120 is symmetrically opened in the middle of the non-removable template 100, and the two ends of the lifting ring 110 pass through the through hole 120 and are detachably connected to the non-removable template 100 by fixing bolts 130.

[0041] Understandably, the design of the lifting ring 110 facilitates the transportation and installation of the non-removable formwork 100, while the through hole 120 facilitates the subsequent arrangement of internal pipelines in the manhole cover beam, further improving the flexibility and convenience of construction. Furthermore, the tight connection between the non-removable formwork 100, the I-beam support beam 200, and the lateral support structure 300 ensures the integrity and stability of the entire assembly structure, effectively resisting external loads and guaranteeing the safety and reliability of the manhole cover beam.

[0042] Specifically, the I-beam support beam 200 has an embedded I-beam steel, which includes an upper flange longitudinal bar, a lower flange longitudinal bar, and a web longitudinal bar. The upper flange longitudinal bar and the lower flange longitudinal bar are respectively located at the upper and lower ends of the I-beam steel, and the web longitudinal bar is fixedly connected between the upper flange longitudinal bar and the lower flange longitudinal bar.

[0043] Understandably, the I-beam support beam 200 significantly enhances the load-bearing capacity and bending stiffness, ensuring the stability and safety of the manhole cover beam during long-term use. Simultaneously, the use of I-beams improves the durability and corrosion resistance of the I-beam support beam 200, further extending the service life of the assembled structure. Furthermore, the close cooperation between the I-beam support beam 200, the non-removable formwork 100, and the lateral support structure 300 forms a stable support system, effectively distributing the load borne by the manhole cover beam and improving the overall load-bearing capacity of the structure.

[0044] Specifically, the lateral support structure 300 includes:

[0045] The pad stone 310 is set at the bottom of the I-beam support beam 200 and is fixedly connected to the I-beam support beam 200.

[0046] A steel plate 320 is set at the bottom of the pad stone 310, and the steel plate 320 is fixedly connected to the pad stone 310;

[0047] Diagonal braces 330 are installed on both sides of the I-beam support beam 200. One end of the diagonal brace 330 is connected to the bottom of the upper flange of the I-beam support beam 200, and the other end of the diagonal brace 330 is fixed to the steel plate 320 by expansion bolts 340.

[0048] Understandably, the design of the lateral support structure 300 further enhances the stability and safety of the assembled structure. The installation of the pad stone 310 and steel plate 320 not only provides a stable support foundation but also ensures the accuracy and firmness of the I-beam support beam 200 during installation. The use of diagonal braces 330 effectively resists horizontal loads, preventing lateral displacement of the manhole cover beam under external loads, further guaranteeing the overall stability and safety of the assembled structure. Furthermore, the close connection between the diagonal braces 330, the I-beam support beam 200, and the steel plate 320 forms an effective force transmission path, ensuring effective load transfer and distribution, and improving the overall load-bearing capacity of the structure.

[0049] Specifically, the angle between the diagonal brace 330 and the steel plate 320 is 70°.

[0050] Understandably, the 70° angle design between the diagonal brace 330 and the steel plate 320 is the optimal solution derived through precise calculations and experimental verification. This design effectively resists horizontal loads while ensuring the stability and durability of the assembled structure. This design fully considers the various load conditions that the manhole cover beam may bear in actual use, ensuring its safety and reliability during long-term use. At the same time, the 70° angle facilitates installation and operation by construction personnel, improving construction efficiency.

[0051] Specifically, the lateral support structure 300 also includes:

[0052] A pad 350 is placed between the bottom of the upper flange of the I-beam support beam 200 and the diagonal brace 330, and the pad 350 is fixedly connected to the I-beam support beam 200.

[0053] Specifically, the pad 350 includes a steel plate 320 layer and a rubber layer, with the steel plate 320 layer and the rubber layer fixedly connected; the rubber layer is connected to the I-beam support beam 200.

[0054] Specifically, the steel plate has 320 layers with a thickness of 15mm, and the rubber layer has a thickness of 5mm.

[0055] Understandably, the pad 350 not only enhances the connection stability between the diagonal brace 330 and the I-beam support beam 200, but also provides excellent cushioning and shock absorption through the rubber layer. When the manhole cover beam is subjected to external loads, the rubber layer can absorb some of the impact force, reduce structural vibration, and further protect the manhole cover beam from damage. Meanwhile, the steel plate 320 layer ensures the strength and durability of the pad 350, enabling it to maintain stable support during long-term use. This design fully considers the safety and durability requirements of the manhole cover beam in actual use, ensuring the overall performance of the assembled structure.

[0056] Specifically, the I-beam support beam 200 includes a first support beam 210, a second support beam 220, a third support beam 230, a fourth support beam 240, a fifth support beam 250, a sixth support beam 260, and a seventh support beam 270; the lengths of the first support beam 210, the second support beam 220, the third support beam 230, the fourth support beam 240, the fifth support beam 250, the sixth support beam 260, and the seventh support beam 270 are all different.

[0057] In this embodiment, there are two of each of the following: the first support beam 210, the second support beam 220, the third support beam 230, the fourth support beam 240, the fifth support beam 250, the sixth support beam 260, and the seventh support beam 270. The lengths of the seventh support beam 270 and the first support beam 210 decrease sequentially.

[0058] In this embodiment, the seventh support beam 270 is symmetrically arranged on both sides of the axis of symmetry closest to the manhole cover. The sixth support beam 260 is arranged outside the seventh support beam 270 and is slightly shorter than the seventh support beam 270. The fifth support beam 250 is arranged further outward and its length continues to decrease. This continues until the first support beam 210, which is arranged on the outermost side and has the shortest length.

[0059] Understandably, this length design allows for a more reasonable stress distribution in the entire 200mm I-beam support beam structure under load, ensuring structural stability, optimizing material utilization, and further saving costs. Furthermore, the different lengths of the support beams can be flexibly adjusted according to the actual dimensions and load requirements of the manhole cover beams, improving the adaptability and versatility of the assembled structure.

[0060] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A free-standing large-span manhole cover beam slab assembly structure, characterized in that, include: The formwork is designed to be removed and is connected to the I-beam support beam. The lateral support structure is symmetrically arranged on both sides of the I-beam support beam and is detachably connected to the I-beam support beam.

2. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 1, characterized in that, The dimensions of the removable formwork are 1500mm×1900mm, the thickness is 40mm, and it is internally configured with HRB400 steel bars with a spacing of 75mm and a diameter of 6mm.

3. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 2, characterized in that, The non-removable template also includes lifting rings and through holes; the through holes are symmetrically opened in the middle of the non-removable template, and the two ends of the lifting rings pass through the through holes and are detachably connected to the non-removable template by fixing bolts.

4. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 3, characterized in that, The I-beam support beam is internally embedded with an I-beam, which includes an upper flange longitudinal bar, a lower flange longitudinal bar, and a web longitudinal bar. The upper flange longitudinal bar and the lower flange longitudinal bar are respectively located at the upper and lower ends of the I-beam, and the web longitudinal bar is fixedly connected between the upper flange longitudinal bar and the lower flange longitudinal bar.

5. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 4, characterized in that, The lateral support structure includes: A pad stone is placed at the bottom of the I-beam support beam, and the pad stone is fixedly connected to the I-beam support beam. A steel plate is disposed at the bottom of the pad stone, and the steel plate is fixedly connected to the pad stone; Diagonal braces are installed on both sides of the I-beam support beam. One end of the diagonal brace is connected to the bottom of the upper flange of the I-beam support beam, and the other end of the diagonal brace is fixed to the steel plate by expansion bolts.

6. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 5, characterized in that, The angle between the diagonal brace and the steel plate is 70°.

7. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 5, characterized in that, The lateral support structure also includes: A pad is disposed between the bottom of the upper flange of the I-beam support beam and the diagonal brace, and the pad is fixedly connected to the I-beam support beam.

8. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 7, characterized in that, The pad includes a steel plate layer and a rubber layer, with the steel plate layer and the rubber layer fixedly connected; the rubber layer is connected to the I-beam support beam.

9. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 8, characterized in that, The steel plate layer has a thickness of 15mm, and the rubber layer has a thickness of 5mm.

10. The formwork-free large-span manhole cover beam-slab assembly structure according to claim 9, characterized in that, The I-beam support beam includes a first support beam, a second support beam, a third support beam, a fourth support beam, a fifth support beam, a sixth support beam, and a seventh support beam; the lengths of the first support beam, the second support beam, the third support beam, the fourth support beam, the fifth support beam, the sixth support beam, and the seventh support beam are all different.

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