Shield well post-pouring plate hanging formwork device

Abstract

The utility model relates to a shield well post-pouring plate hanging formwork device which comprises double-spliced 56b I-shaped steel, split bolts, square timbers and a formwork, the laying direction of the double-spliced 56b I-shaped steel is perpendicular to the long edge of a reserved hole of a shield well, two first square timbers are arranged at the bottom of each end in a cushioned mode, the upper double-spliced 56b I-shaped steel and the lower double-spliced 56b I-shaped steel are fixedly connected together through the split bolts, and the formwork is fixedly connected with the double-spliced 56b I-shaped steel through the split bolts. The center distance of the double-spliced 56b I-shaped steel in the long edge direction of the shield well reserved hole is 3 m, the length of the split bolt is 3 m, the distance of the double-spliced 56b I-shaped steel in the short edge direction of the shield well reserved hole is 2 m, the second square timber is laid on the lower double-spliced 56b I-shaped steel fixed through the split bolt, the laying direction of the second square timber is perpendicular to the double-spliced 56b I-shaped steel, and the formwork is laid on the second square timber. A traditional all-round scaffold is replaced by the hanging formwork system composed of the I-shaped steel and the finish rolling deformed steel bars, the tedious working procedures of erecting and dismantling the scaffold are avoided, and a large amount of time is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of subway engineering, in particular to a shield shaft post-casting slab hanging formwork device. Background Art

[0002] In urban rail transit construction, shield tunneling is a common method for tunnel construction. Shield tunnel construction requires the establishment of shield shafts at subway stations to provide the necessary working space for the departure, arrival, installation and disassembly of shield machines. After the shield construction is completed, the shield shaft needs to be sealed to make it seamlessly integrated with the main structure of the station to ensure the integrity, safety and usability of the station structure.

[0003] At present, shield shaft plugging construction generally uses full-height brackets and wooden formworks. It is necessary to set up multiple layers of full-height brackets in the shield shaft. Workers lay wooden formworks on the brackets and tie steel bars, and then pour concrete to form a plugging structure. Traditional full-height brackets and wooden formwork devices have problems such as large size, heavy weight, time-consuming installation and disassembly, and occupying construction space. The main reason is that the full-height bracket needs to be set up in multiple layers, the construction process is complicated, and the erection and dismantling are time-consuming and laborious; and the bracket system is huge and occupies a large amount of construction space, which brings difficulties to the cross-operation of plugging construction and other processes such as station main structure construction and track laying construction. At the same time, setting up multiple layers of full-height brackets in a narrow shield shaft is not only inconvenient for construction, but also poses a major safety hazard.

[0004] Take Jinhai New District Station of Kunming Metro Line 5 as an example. As the track-laying base of the entire line, the duration of the blocking construction affects the track-laying progress and opening time of the entire line. The traditional full-span bracket + wooden formwork device is not only time-consuming to install and disassemble, but also occupies a large amount of construction space, which brings difficulties to the cross-operation of blocking construction and other processes such as station main structure construction and track-laying construction, affecting the construction progress and increasing construction costs. Utility Model Content

[0005] In view of the above defects of the existing technical solutions, the main purpose of the utility model is to provide a new type of shield well post-cast slab hanging formwork device which is small in size, light in weight, easy to install and disassemble, and occupies little construction space, so as to improve the efficiency of shield well sealing construction and ensure construction progress and quality.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a shield well post-cast slab hanging formwork device, comprising a double-piece 56b I-beam, tension bolts, square timber and a template; the laying direction of the double-piece 56b I-beam is perpendicular to the long side of the reserved opening of the shield well, and two 10cm×10cm first square timbers are respectively padded at the bottom of the end, and the upper and lower double-piece 56b I-beams are connected and fixed together by tension bolts, the center spacing of the double-piece 56b I-beams along the long side direction of the reserved opening of the shield well is 3m, the length of the tension bolts is 3m, and the spacing along the short side direction of the reserved opening of the shield well is 2m, the tension bolts include Φ28 fine-rolled threaded steel and nuts threadedly connected to both ends of the fine-rolled threaded steel, a number of 10cm×10cm second square timbers are laid on the lower double-piece 56b I-beam after the tension bolts are fixed, the laying direction of the second square timber is perpendicular to the double-piece 56b I-beam, and the template is laid on the second square timber.

[0007] Preferably, the center distance between the second square timbers is 250 mm-300 mm.

[0008] Preferably, the tension bolts are connected by two layers of 100*100mm washers and double nuts.

[0009] Preferably, the template is made of 15 mm thick multi-layer wood glue board.

[0010] Preferably, a release agent is applied to the surface of the template, a transparent tape is attached to the template joints, and a sponge strip is attached to the upper edge of the template along the periphery of the hole.

[0011] Preferably, the tension bolts are adjustable tension bolts, which are used to adjust the elevation of the template after the template is installed.

[0012] Preferably, the template elevation is 5 mm higher than the design elevation, and is arched in the middle of the template with an arch height of 10 mm.

[0013] Preferably, the height difference between the two plate surfaces of adjacent templates is less than or equal to 2 mm.

[0014] Preferably, the template surface flatness is less than or equal to 5 mm.

[0015] Preferably, the middle plate between the upper and lower double-piece 56b I-beams is 400 mm.

[0016] In summary, the beneficial effects of the utility model are as follows: the use of a hanging formwork system composed of I-beams and fine-rolled threaded steel to replace the traditional full-floor scaffolding avoids the cumbersome process of erecting and dismantling the scaffolding, saving a lot of time. At the same time, the hanging formwork construction and track laying operations can be carried out simultaneously, without cross-construction interference, and the formwork can be removed after the concrete reaches the strength, without waiting for the scaffolding to be removed, thereby greatly shortening the construction period of the shield shaft plugging. Materials such as I-beams and threaded steel required for hanging formwork construction can be used repeatedly, with a high material utilization rate, saving construction costs. By making full use of the good force-bearing properties of I-beams, the huge scaffolding system is replaced by concise components, the workload of construction preparation is greatly reduced, and the construction organization is smoother. The hanging formwork construction is highly factory-based and assembled, avoiding the inconvenience of traditional on-site operations and making construction simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is an overall schematic diagram of a shield shaft post-casting slab hanging formwork device according to an embodiment of the utility model;

[0019] Figure 2 A top view of a shield well post-casting slab hanging formwork device according to an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the double-piece 56b I-beam structure of an embodiment of the utility model;

[0021] Explanation of the reference numerals: 1- double-jointed 56b I-beam, 2- tension bolts, 3- first square timber, 4- second square timber, 5- template. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model belong to the utility model.

[0023] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0024] See also Figure 1-3 The present embodiment provides a shield well post-casting plate hanging formwork device, comprising a double-jointed 56b I-beam 1, a tension bolt 2, a first square wood 3, a second square wood 4 and a template 5. The double-jointed 56b I-beam 1 is formed by joining two 56b I-beams on the left and right, and the laying direction is perpendicular to the long side of the reserved opening of the shield well. Two first square woods 3 with a cross-section of 10cm×10cm are placed at the bottom of the end of each double-jointed 56b I-beam 1.

[0025] The upper and lower double-jointed 56b I-beams 1 are connected and fixed together by tension bolts 2. The center spacing of the double-jointed 56b I-beams 1 along the long side of the reserved hole of the shield shaft is 3m, the length of the tension bolts is 3m, and the spacing along the short side of the reserved hole of the shield shaft is 2m. The tension bolts 2 include Φ28 fine-rolled threaded steel, with nuts of corresponding specifications at both ends. The nuts are threadedly connected to the two ends of the fine-rolled threaded steel. Specifically, the tension bolts 2 are connected by two layers of 100*100mm gaskets and double nuts. Several 10cm×10cm second square woods 4 are laid on the lower double-jointed 56b I-beams 1 after the tension bolts are fixed. The laying direction of the second square woods 4 is perpendicular to the double-jointed 56b I-beams 1, as a support for the laying of the template 5, and the template 5 is laid on the second square wood 4 for the subsequent concrete.

[0026] Furthermore, the center spacing of the second square wood 4 is 250mm-300mm. This spacing takes into account the span of the template 5, the deadweight of the concrete and the construction load, which can ensure that the template 5 has sufficient support and avoid the second square wood 4 being too dense to affect the pouring and vibration of the concrete.

[0027] In addition, the template 5 is made of 15mm thick multi-layer wood plywood. Compared with other materials, wood plywood has high strength and smooth surface, making it more suitable for templates. A release agent is applied to the surface of the template 5, and transparent tape is applied to the template joints, and sponge strips are attached to the upper edge of the template around the hole. The release agent can reduce the bonding force between the template 5 and the concrete, making it easier to remove the mold. The transparent tape is applied to the joints to prevent concrete leakage. The sponge strips can form a tight seal around the hole to further avoid the risk of leakage.

[0028] Furthermore, the tension bolts 2 are in an adjustable structural form. After the template 5 is installed, the elevation of the template 5 can be fine-tuned by adjusting the tension bolts 2. This operation can effectively eliminate the height difference generated during the installation of the template 5, so that its elevation meets the design requirements. Specifically, the installation elevation of the template 5 is 5mm higher than the design elevation, and the middle part of the template 5 is arched, with an arch height of 10mm. Appropriate superelevation and arching can compensate for the deformation generated during the concrete pouring process, ensuring that the elevation and flatness of the top surface of the post-cast slab after forming meet the requirements.

[0029] In addition, the height difference between adjacent templates 5 should be controlled within 2mm, which is crucial to ensure the flatness of the top surface of the post-cast slab. The flatness of the surface of the template 5 should be controlled within 5mm. The surface flatness directly affects the quality of concrete molding, especially the appearance of the top surface of the post-cast slab. The surface flatness of the template 5 can be improved by selecting high-quality template materials and strictly controlling the quality of template 5 splicing.

[0030] In some embodiments, the thickness of the middle plate between the upper and lower double-jointed 56b I-beams 1 is 400 mm. The thickness of the middle plate of 400 mm is determined comprehensively based on the force calculation of the post-cast slab structure and the requirements of the concrete pouring process, which can ensure that the post-cast slab has sufficient bearing capacity and crack resistance.

[0031] The construction steps of the shield well post-casting plate hanging formwork device of this embodiment are as follows: at the reserved opening of the shield well, two upper and lower double-jointed 56b I-beams 1 are arranged along the short side direction of the opening, and the center spacing of the two I-beams is 3m. Two first square timbers 3 are placed at the ends of the double-jointed 56b I-beams 1. Between the upper and lower double-jointed 56b I-beams 1, a tension bolt 2 is arranged every 2m along the short side direction of the opening, and the nut is tightened to make the tension bolt 2 and the double-jointed 56b I-beam 1 tightly connected. The second square timber 4 is laid on the double-jointed 56b I-beam 1 below, and the second square timber 4 is arranged along the vertical direction of the double-jointed 56b I-beam 1, and the center spacing of two adjacent second square timbers 32 is controlled to be 250mm-300mm. The template 5 is laid on the second square timber 4, and the height difference between the templates 5 is adjusted to not exceed 2mm, and the surface flatness is controlled within 5mm. Apply mold release agent on the surface of formwork 5, stick tape on the joints, and stick sponge strips around the openings. By adjusting the tension bolts 2, the elevation of formwork 5 is controlled to be 5mm higher than the design, and a 10mm arch is set in the middle. After the installation of the hanging formwork device is completed, tie the steel bars, pour the middle plate concrete with a thickness of 400mm, trim the surface of the post-cast plate concrete, and maintain it until it reaches the design strength.

[0032] In summary, the utility model discloses a shield well post-casting slab hanging formwork device, which includes a double-piece 56b I-beam 1, a tension bolt 2, a first square wood 3, a second square wood 4 and a template 5. The double-piece 56b I-beam 1 is connected into a whole by an adjustable tension bolt 2, and the second square wood 4 and the template 5 are arranged on the double-piece 56b I-beam 1 to form a template support system for pouring concrete for the shield well post-casting slab. The utility model has a simple structure and a high degree of component standardization, which is convenient for factory prefabrication and on-site installation, and significantly improves the construction efficiency. The double-piece 56b I-beam is used as the main beam, which has a large bending rigidity and can effectively replace the traditional scaffolding, reducing the workload of the frame erection. The tension bolt adopts an adjustable design, which is convenient for the precise control of the template elevation and the arch degree, and ensures the molding quality of the post-casting slab concrete. The hanging formwork device is independent of the shield well structure and will not affect other construction operations in the hole, effectively alleviating the pressure of the construction period and improving the coordination of the construction organization. The hanging formwork device of the utility model has strong adaptability, can flexibly cope with shield shafts of different sizes and shapes, and has good prospects for promotion and application.

[0033] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A shield shaft post-casting plate hanging formwork device, It is characterized in that It comprises a double-jointed 56b I-beam (1), tension bolts (2), square timber and a template (5); the double-jointed 56b I-beam (1) is laid in a direction perpendicular to the long side of the reserved hole of the shield shaft, two 10cm×10cm first square timbers (3) are laid at the bottom of each end, the upper and lower double-jointed 56b I-beams (1) are connected and fixed together by tension bolts (2), the center spacing of the double-jointed 56b I-beam (1) along the long side direction of the reserved hole of the shield shaft is 3m, and the The length of the tension bolts (2) is 3m, and the spacing along the short side direction of the reserved opening of the shield shaft is 2m. The tension bolts (2) include Φ28 fine-rolled threaded steel and nuts threadedly connected to both ends of the fine-rolled threaded steel. A plurality of 10cm×10cm second square timbers (4) are laid on the lower double-jointed 56b I-beam (1) after the tension bolts (2) are fixed. The laying direction of the second square timbers (4) is perpendicular to the double-jointed 56b I-beam (1), and the template (5) is laid on the second square timbers (4).

2. The shield well post-casting slab hanging formwork device according to claim 1, Features: The center distance between the second square timbers (4) is 250 mm to 300 mm.

3. The shield well post-casting slab hanging formwork device according to claim 1, Features: The tension bolts (2) are connected via two layers of 100*100mm washers and double nuts.

4. The shield well post-casting slab hanging formwork device according to claim 1, Features: The template (5) is made of 15 mm thick multi-layer wood glue board.

5. The shield shaft post-casting plate hanging formwork device according to claim 4, Features: A release agent is applied to the surface of the template (5), a transparent tape is attached to the joints of the template (5), and a sponge strip is attached to the upper edge of the template (5) around the hole.

6. The shield well post-casting slab hanging formwork device according to claim 4, Features: The tension bolts (2) are adjustable tension bolts (2) and are used to adjust the elevation of the template (5) after the template (5) is installed.

7. The shield well post-casting slab hanging formwork device according to claim 6, Features: The elevation of the template (5) is 5 mm higher than the design elevation, and is arched in the middle of the template (5), with an arch height of 10 mm.

8. The shield well post-casting slab hanging formwork device according to claim 6, Features: The height difference between the two plate surfaces of adjacent templates (5) is less than or equal to 2 mm.

9. The shield shaft post-casting plate hanging formwork device according to claim 6, Features: The surface flatness of the template (5) is less than or equal to 5 mm.

10. The shield well post-casting slab hanging formwork device according to claim 1, Features: The middle plate between the upper and lower double 56b I-beams (1) is 400 mm.

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