A hoistable steel platform device for erecting inner brackets for connecting caissons

Abstract

The utility model relates to a hoistable steel platform device for erecting an inner bracket of a caisson, comprising a caisson and a steel platform, steel brackets are arranged on opposite sides of the inner side of the wall of the caisson, and the steel brackets extend horizontally to the outside of the inner side of the wall of the caisson; the steel platform is hoisted to the top of the steel brackets by a steam crane, and the spacing between the steel brackets and the casting surface of the wall of the caisson is 40 to 60 cm, and positioning plug-in rods are arranged around the upper plane of the steel platform, and the positioning plug-in rods and the steel platform are vertically distributed, and a construction platform composed of scaffolding is plugged in through the positioning plug-in rods; the beneficial effects of the utility model are: to improve the standardization and standardization of the erection of scaffolding for internal operations of the caisson, improve the visual environment of the operators, and improve the safety; to speed up the operation efficiency and reduce the construction cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of caisson construction, and particularly relates to a hoistable steel platform device used for erecting inner brackets for connecting heights in caissons. Background Art

[0002] At present, when the caisson is raised, the following two methods are often used to set up the internal working scaffolding:

[0003] (1) When connecting the height of the scaffolding, the mud surface in the well is used as the foundation of the vertical pole, and then the pad is set up from bottom to top. The mud surface at the bottom of the vertical pole of this process needs to be manually trimmed, and the foundation is easily soaked by rainwater due to the drainage in the well, which poses a safety hazard of the vertical pole tilting due to the loss of local bearing capacity of the foundation. As the sinking depth of the caisson increases, on the one hand, it is necessary to set up a working channel for personnel to go up and down before the scaffolding is erected, and on the other hand, the height of the scaffolding is increased, and the materials and labor are increased. Therefore, this process is not economical to use in the connection of deeper caissons, and is not suitable for caissons that sink without drainage.

[0004] (2) When making the shaft wall, the internal secondary structure reserves the extended steel bars, and the longitudinal and transverse steel pipes are placed on top. The steel pipes are fixedly connected to the internal support poles through fasteners to bear the load of the upper working platform. During the erection of the scaffolding in this process, it is basically high-altitude work, which has great safety hazards. It is necessary to equip hanging baskets, car cranes, etc. to cooperate with the construction, which increases the cost of using mechanical equipment; it is restricted by the length of the steel pipe and is not suitable for caissons with larger sizes; in addition, due to the deviation of the reserved plane position of the steel bars and the stiffness of the longitudinal and transverse steel pipe materials on the upper part, when the operator is working on the platform, the platform will shake up and down locally, increasing the sense of insecurity. As the sinking depth of the caisson increases, the operator's line of sight increases, which can easily cause dizziness and weak legs, increasing safety hazards. At the same time, this process does not meet the industry requirements for standardization and standardization. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and to provide a hoistable steel platform device for erecting internal brackets for connecting caissons, so as to improve the standardization of the erection of scaffolding inside caissons, improve the visual environment of workers, improve safety, speed up work efficiency and reduce construction costs.

[0006] The purpose of the utility model is achieved through the following technical scheme. The hoistable steel platform device used for the erection of the inner bracket of the caisson comprises a caisson and a steel platform. The opposite sides of the inner side of the wall of the caisson are provided with steel corbels, and the steel corbels extend horizontally to the outside of the inner side of the wall of the caisson; the steel platform is lifted to the top of the steel corbels by a steam crane, and the spacing between the steel corbels and the casting surface of the wall of the caisson is 40 to 60 cm. Positioning plug-in rods are provided around the upper plane of the steel platform, and the positioning plug-in rods are vertically distributed with the steel platform, and a construction platform composed of scaffolding is plugged in through the positioning plug-in rods.

[0007] The beneficial effects of the utility model are as follows: compared with the prior art, the pre-buried steel sections during the manufacture of the caisson are used as steel bull legs, and the pre-processed steel section platform is placed on the top of the steel bull legs through a car crane as a construction platform for the caisson inner frame and the workers to set up. The steel section platform is used as the foundation of the inner frame, and there is no need to set up an up and down passage for workers, no need to set up a pad, and it is not affected by the caisson sinking process. The erection height of the inner frame is basically the same as the erection height of the outer frame, which greatly reduces the erection height of the inner frame and saves construction costs. In addition, due to the existence of the steel section platform, during the erection of the inner frame and the height connection of the caisson, the workers' field of vision height is about 6m, avoiding the safety hazards caused by dizziness and other physical discomfort of traditional inner frame workers. Finally, the inner frame is erected using the steel section platform, which meets the development needs of industry standardization and standardization.

[0008] Preferably, the steel platform includes a main beam and a secondary beam, wherein two main beams are provided, and a plurality of secondary beams are provided and are placed on the main beam along the length direction of the main beam, and the secondary beam is fixed to the main beam by welding; square timbers are laid on the secondary beams, and the square timbers are laid in sequence along the length direction of the secondary beams, bamboo plywood is laid on the square timbers, and the bamboo plywood is fixed to the square timbers by steel nails; through the arrangement of the above-mentioned structure, the steel platform can be manufactured in advance according to the matching size when the caisson is manufactured, so the construction and assembly are more convenient and the structure is simpler.

[0009] Preferably, the steel corbels are arranged on a pair of opposite sides of the caisson, and the steel corbels are placed on the main beam; in this way, the bearing force of the steel platform is all on the steel corbels, and the steel platform is more stable during the scaffolding erection process and the construction is more convenient.

[0010] Preferably, the steel corbel is buried in the wall of the caisson to a depth of 1 / 2 of the wall of the caisson, and the length of the steel corbel extending out of the wall of the caisson is 30 to 50 cm; this makes the steel platform resting on the steel corbel more stable and safer.

[0011] Preferably, the pre-buried spacing of the steel corbels in the caisson wall is 1.5 to 2 m; by pre-buried multiple steel corbels distributed at equal intervals, the stability of the steel platform resting on the steel corbels is further enhanced.

[0012] Preferably, the main beam is made of 12# I-beam or 12# double-jointed channel steel, and the secondary beam is made of 12# I-beam or 12# channel steel; by adopting the above-mentioned steel materials, the stability of the steel platform structure is improved.

[0013] Preferably, the length of the positioning plug rod extending along the upper plane of the steel platform is 20 to 30 cm; this makes the scaffolding positioning rod plugged on the positioning plug rod more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main structure between the hoistable steel platform device and the caisson of the utility model.

[0015] Figure 2 It is a schematic diagram of the main structure between the steel bracket and the caisson of the utility model.

[0016] Figure 3 It is a side view structural schematic diagram between the steel bracket and the caisson of the utility model.

[0017] The numbers in the attached drawings are: 1, caisson; 2, steel platform; 3, steel corbel; 4, positioning plug-in rod; 11, well wall casting surface; 21, main beam; 22, secondary beam; 23, square timber. DETAILED DESCRIPTION

[0018] The following will be combined with the attached Figures 1 to 3 The utility model is introduced in detail: the utility model comprises a caisson 1 and a steel platform 2, steel corbels 3 are arranged on the opposite sides of the inner wall of the caisson 1, and the steel corbels 3 extend horizontally to the outside of the inner wall of the caisson 1; the steel platform 2 is lifted to the top of the steel corbels 3 by a steam crane, and the distance between the steel corbels 3 and the casting surface 11 of the wall of the caisson 1 is 40 to 60 cm, and positioning plug-in rods 4 are arranged around the upper plane of the steel platform 2, and the positioning plug-in rods 4 are vertically distributed to the steel platform 2, and a construction platform composed of a scaffolding is plugged through the positioning plug-in rods 4.

[0019] The steel platform 2 includes a main beam 21 and a secondary beam 22. There are two main beams 21, and a plurality of secondary beams 22 are placed on the main beam 21 along the length direction of the main beam 21. The secondary beam 22 is fixed to the main beam 21 by welding. The secondary beam 22 is paved with square timbers 23, which are sequentially laid along the length direction of the secondary beam 22. Bamboo plywood is laid on the square timbers 23, and the bamboo plywood is fixed to the square timbers 23 by steel nails. The steel corbels 3 are arranged on a pair of opposite sides of the caisson 1, and the steel corbels 3 are placed on the main beam 21. The depth of the steel corbels 3 buried in the wall of the caisson 1 is 1 / 2 of the wall of the caisson 1, and the length of the steel corbels 3 extending from the wall of the caisson 1 is 30 to 50 cm.

[0020] The pre-buried spacing of the steel bracket 3 in the wall of the caisson 1 is 1.5 to 2 meters. The main beam 21 is made of 12# I-beam or 12# double-jointed channel steel, and the secondary beam 22 is made of 12# I-beam or 12# channel steel. The length of the positioning plug rod 4 extending along the upper plane of the steel platform 2 is 20 to 30 cm.

[0021] The utility model mainly manufactures a hoistable steel platform, uses a car crane to directly hoist the platform above the embedded steel bracket 3, and uses the steel platform 2 to set up the working scaffolding from bottom to top. The specific implementation steps are as follows:

[0022] 1. Design and manufacture of steel platform

[0023] The production of steel platform mainly includes several processes such as processing main beam 21, processing secondary beam 22, welding positioning plug-in rod 4, laying square wood 23, laying bamboo plywood, etc. (Platform structure is detailed in the attached Figure 1 ), the specific operations are as follows:

[0024] 1) Processing the main beam

[0025] The main beam 21 is made of I-beam or double-jointed channel steel. In principle, the processing length is determined by subtracting 70cm from the long side of the caisson. However, for a smaller caisson (the maximum size of the caisson does not exceed 7m), it can also be determined by subtracting 70cm from the short side of the caisson. The main beam 21 is extended by welding or high-strength bolts. Considering the lightness of the steel platform 2, it is recommended that the main beam 21 be made of 12# I-beam or 12# double-jointed channel steel.

[0026] 2) Processing and fixing the secondary beam

[0027] The secondary beam 22 is made of I-beam or channel steel, which is placed on the main beam 21 according to the spacing of the scaffolding poles and is welded and fixed to the main beam 21. The secondary beam 22 is recommended to be 12# I-beam or 12# channel steel.

[0028] 3) Welding operation scaffolding pole positioning steel bars

[0029] Φ25 steel bars are vertically welded to the secondary beam 22 as the inner scaffolding uprights positioning plug-in rods 4, with a length of 20 to 30 cm, and are arranged according to the plane position of the uprights designed for the working scaffolding.

[0030] 4) Laying square timber

[0031] 50×100 mm square timber 23 is laid on the secondary beam 22 at a spacing of 350 mm.

[0032] 5) Lay bamboo plywood

[0033] 15mm bamboo plywood is used for full paving and fixed with steel nails and square wood 23.

[0034] 2. Embedded steel bracket

[0035] When making the caisson, embedded steel is used as the steel bracket for the steel platform 2. Its cantilever length is recommended to be 30 to 50 cm (the actual size can be adjusted according to the size of the caisson and the length of the secondary beam). The length buried in the caisson 1 is not less than 50 cm. It is recommended to embed it according to 1 / 2 of the thickness of the wall of caisson 1. Its vertical embedding position is about 50 cm below the casting surface of the wall of caisson 1. The embedded spacing is 1.5m to 2.0m, which is determined according to the caisson size, embedded steel material specifications and the design load calculation of the working scaffolding. Considering that the design spacing of the horizontal steel bars in caisson 1 is mostly 10 cm, it is recommended to select 12# and below I-beams for embedded steel. For caissons with larger cross-sections, if the main beam is extended, it is recommended to add embedded brackets at the extension position. For details on the size and position of the embedded steel bracket 3, please see the attached document Figure 2 , 3 .

[0036] 3. Steel platform hoisting

[0037] A 25t truck crane is used to lift the steel platform 2 to the top of the steel corbel 3 using a sling and a four-point lift.

[0038] 4. Scaffolding erection

[0039] The scaffold erection personnel stand directly on the platform, insert the inner and outer uprights of the scaffold into the positioning plug-in rods 4 of the steel platform 2, and then complete the inner frame erection layer by layer from bottom to top according to the working scaffold structure.

[0040] This platform device is used in three pipeline branch caissons in a comprehensive pipeline corridor project in Ningbo. Its outer dimensions are 9.2m×7.7m, the wall thickness is 1.1m / 0.9m, the inner dimensions are 7.0m×5.5m, the maximum sinking depth is about 24.5m, and it uses undrained sinking.

[0041] In this project, the platform main beam, secondary beam and embedded steel brackets are all made of 12# I-beams. Since the internal dimensions of the caisson in this project are 7.0m×5.5m, considering the length specifications of steel sections on the market, in order to reduce material loss, the main beam is set parallel to the short side of the caisson, with a length of 4.8m and a secondary beam length of 6m; the embedded depth of the bracket is 50cm, the cantilever is 70cm, the arrangement spacing is 1.5m, and it is located 50cm below the top of this section of the caisson. In this project, due to the application of this platform, the height of the internal frame is basically 4.5m, and through application, the platform is safe and reliable, achieving the purpose of the invention.

[0042] The present invention is not limited to the above-mentioned embodiments. Regardless of any changes in shape or material composition, any structural design provided by the present invention is a variation of the present invention and should be considered within the protection scope of the present invention.

Claims

1. A hoistable steel platform device for connecting a caisson to an inner bracket, comprising a caisson (1) and a steel platform (2), characterized in that: Steel brackets (3) are provided on opposite sides of the inner wall of the caisson (1), and the steel brackets (3) extend horizontally to the outside of the inner wall of the caisson (1); the steel platform (2) is lifted to the top of the steel brackets (3) by a steam crane, and the distance between the steel brackets (3) and the casting surface (11) of the wall of the caisson (1) is 40 to 60 cm. Positioning plug-in rods (4) are provided around the upper plane of the steel platform (2), and the positioning plug-in rods (4) are vertically distributed with the steel platform (2), and a construction platform composed of a scaffolding is plugged in through the positioning plug-in rods (4).

2. The hoistable steel platform device for erecting inner brackets for connecting caissons according to claim 1 is characterized in that: The steel platform (2) comprises a main beam (21) and a secondary beam (22), wherein two main beams (21) are provided, and a plurality of secondary beams (22) are provided and are placed on the main beam (21) along the length direction of the main beam (21), and the secondary beam (22) and the main beam (21) are fixed by welding; square timbers (23) are laid on the secondary beam (22), and the square timbers (23) are laid in sequence along the length direction of the secondary beam (22), and bamboo plywood is laid on the square timbers (23), and the bamboo plywood is fixed to the square timbers (23) by steel nails.

3. The hoistable steel platform device for erecting inner brackets for connecting caissons according to claim 2 is characterized in that: The steel bracket (3) is arranged on a pair of opposite sides of the caisson (1), and the steel bracket (3) is placed on the main beam (21).

4. The hoistable steel platform device for erecting inner brackets for connecting caissons according to claim 1 or 3 is characterized in that: The depth of the steel bracket (3) buried in the wall of the caisson (1) is 1 / 2 of the wall of the caisson (1), and the length of the steel bracket (3) extending from the wall of the caisson (1) is 30 to 50 cm.

5. The hoistable steel platform device for erecting inner brackets for connecting caissons according to claim 4 is characterized in that: The pre-buried spacing of the steel brackets (3) in the wall of the caisson (1) is 1.5 to 2 m.

6. The hoistable steel platform device for erecting inner brackets for connecting caissons according to claim 2 is characterized in that: The main beam (21) is made of 12# I-beam or 12# double-jointed channel steel, and the secondary beam (22) is made of 12# I-beam or 12# channel steel.

7. The hoistable steel platform device for erecting inner brackets for connecting caissons according to claim 1 is characterized in that: The length of the positioning plug-in rod (4) extending along the upper plane of the steel platform (2) is 20 to 30 cm.

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