CN115370115A - Construction method of support-free cantilever platform - Google Patents

Abstract

The invention discloses a construction method of a support-free cantilever platform, which comprises the following steps: firstly, constructing a building main body structure to a position above an elevation of an overhanging platform; step two, setting up an operation platform below the elevation position of the overhanging platform; step three, after the construction of the operation platform is completed, erecting an auxiliary support at the elevation position of the overhanging platform; after the auxiliary support is erected, hoisting a cantilever beam template at the bottom of the auxiliary support, and pouring a cantilever beam; fifthly, after the cantilever beam is poured, fixedly mounting a prefabricated cantilever platform bottom plate on the top of the cantilever beam; and sixthly, after the cantilever platform bottom plate is installed, pouring a floor slab on the cantilever platform bottom plate, after the cantilever platform is constructed, dismantling the operating platform and the auxiliary support, and finishing construction. The invention can meet the bearing requirement of the construction of the ultra-large cantilever platform, simplifies the construction process, saves the construction cost, does not need to build a complex and fussy support frame, and can not damage the structure of the cantilever platform.

Description

A construction method for a support-free cantilevered platform

technical field

The invention belongs to the technical field of building construction, in particular to a construction method for a support-free cantilevered platform.

Background technique

During construction, cantilevered platforms need to be built on some high-rise buildings. There are usually two support methods used in the construction of existing high-altitude cantilevered platforms: one method is to build a support structure under the cantilevered platform, and use steel wire ropes to pull up the support structure. , and then build a support frame on the support structure, use the support frame to support, and cast the cantilevered platform in one piece; another method is to build a support structure under the cantilever platform, and set a lower brace at the bottom of the support structure, and use the support structure to carry out Support, cast the cantilevered platform in one piece.

The above method has the following technical problems: 1. In the first method, it is extremely difficult to set up a support frame at a high altitude, and the operation process is very difficult. When the area of the cantilevered platform is large, in order to ensure the bearing capacity, the steel wire rope needs to meet certain requirements. At the same time, in order to ensure that the support frame is not super high, it is necessary to anchor the steel wire rope to the main structure of the building through the beam plate of the cantilevered platform, which will cause damage to the cantilevered platform; 2. In the second method, the understayed The support form has limited bearing capacity and poor stability, which cannot meet the construction needs of super-large cantilevered platforms.

Contents of the invention

The invention provides a support-free cantilevered platform construction method to solve the above-mentioned problems in the prior art.

A construction method for a support-free cantilevered platform provided by the present invention comprises the following steps:

Step 1. Construction of the main structure of the building

Construct the main structure of the building to the position above the elevation of the cantilevered platform, and reserve the height for pulling the rope in the later stage;

Step 2. Set up the operating platform

Set up an operating platform below the elevation of the cantilevered platform for construction workers to place materials and perform construction operations;

Step 3: Set up the auxiliary bracket

After the construction of the operation platform is completed, an auxiliary support is erected at the elevation of the cantilevered platform to fix the formwork of the cantilevered beam;

Step 4. Pouring the cantilever beam

After the auxiliary support is erected, the cantilever beam formwork is hoisted at the bottom of the auxiliary support, and the cantilever beam is poured;

Step 5. Install the bottom plate of the cantilevered platform

After the pouring of the cantilever beam is completed, the prefabricated cantilever platform floor is fixed on the top of the cantilever beam;

Step 6. Pouring the floor slab

After the bottom plate of the cantilever platform is installed, the floor slab is poured on the bottom plate of the cantilever platform. After the construction of the cantilever platform is completed, the operation platform and auxiliary support are removed, and the construction is completed.

Further, in the step 2, the operation platform includes several triangular supports and several connecting beams, the triangular supports are fixed on the main structure of the building at uniform radial intervals, and the connecting beams are fixed on the triangular The top of the bracket is used to connect several triangular brackets; the bottom plate of the operating platform is laid on the triangular bracket; the edge of the operating platform is fixed with double rows of protective fences;

The triangular bracket includes a main beam, a brace and several webs, the bottom of the main beam is fixed with the diagonal brace, and a plurality of webs are fixed between the main beam and the diagonal brace.

Further, in the step 3, the auxiliary support includes several horizontal beams and several ring beams, several of the horizontal beams are radially fixed on the main structure of the building, the horizontal beams are evenly spaced, and several of the ring beams The shape beams are sequentially fixed on the horizontal beams from inside to outside along the circumferential direction.

Further, several ropes are obliquely drawn between the horizontal beam and the main structure of the building, and the ends of the several ropes are sequentially fixed at quarter nodes of the horizontal beam.

Further, in the step 4, the cantilever beam formwork is installed on the bottom of the auxiliary bracket through hoisting parts; the hoisting parts include an upper fixing plate, a lower fixing plate, several vertical tension bolts, several main keels, Several secondary keels and several transverse tension bolts, the upper fixing plate is fixed on the top of the horizontal beam, and the lower fixing plate is fixed below the upper fixing plate through several vertical tension bolts; Two rows of said main keels are mounted symmetrically and vertically on the lower fixing plate, said cantilever beam formwork is fixed on said lower fixing plate between the two rows of said main keels, and the two rows of said main keels pass through A number of said transverse tension bolts are fixed; a number of transverse said secondary keels are evenly laid between said main keel, said lower fixing plate and said cantilever beam formwork.

Further, in the fifth step, the bottom plate of the cantilevered platform is made by laminating high-strength truss plates.

Further, in the fifth step, the bottom plate of the cantilevered platform is fixedly connected with the joints of the cantilever beams by pouring concrete, and reinforcing components or L-shaped clamps are installed for reinforcement.

Further, the reinforcement component includes a fixed cross bar and several fixed vertical bars, the fixed cross bar is fixed on the bottom of the cantilever platform floor, and several fixed vertical bars are fixed at the bottom of the fixed cross bar at intervals, so The fixed vertical rod is fixed on the cantilever beam.

Further, in the sixth step, the floor slab is poured in a manner of radiating from the center to the surroundings.

Further, in the first step, a shear key for strengthening the cantilever beam is fixed on the main structure of the building.

Advantage and positive effect of the present invention are:

1. The construction method of the support-free cantilevered platform, the cantilevered platform is constructed step by step, and the cantilever beam is cast by installing the hanging form through a simple auxiliary bracket. After the cantilever beam is poured, the prefabricated cantilever is directly installed on the top of the cantilever beam The bottom plate of the platform is enough. Through the optimization of the construction steps, it is unnecessary to build a support frame structure and reduce the load. When selecting construction materials, the selection surface is wider and the applicability is strong. It can be applied to the construction of super large cantilever structures, which greatly simplifies the construction. The process satisfies the stability requirements of super-large cantilevered platform construction well, does not need to build cumbersome support structures, does not damage the structure of the cantilevered platform itself, and overcomes the disadvantages of large volume and heavy weight of the lower support structure.

2. In the construction method of the support-free cantilevered platform, the auxiliary support structure is simple, easy to manufacture, and low in cost. The horizontal beam of the auxiliary support is tied by ropes, which improves the stability of the auxiliary support and ensures the smooth operation of the subsequent cantilever beam. The pouring overcomes the torsion and downward deflection of the horizontal beam due to its own gravity, and effectively avoids the deformation of the horizontal beam.

3. In the construction method of the support-free cantilevered platform, an operation platform is provided during the construction process, which is convenient for construction personnel to place materials and carry out construction work. Double rows of protective fences are installed on the edge of the operation platform to ensure the safety of construction and prevent the occurrence of falling from high altitudes. Security risks.

4. In the construction method of the support-free cantilevered platform, the auxiliary bracket is used to fix the cantilever beam formwork, and the cantilever beam formwork can be firmly fixed through a simple structure. The operation method is simple and convenient, which simplifies the construction process and improves the construction efficiency , without the need to build complex scaffolding structures for support, which overcomes the problem of cumbersome and complicated construction steps.

5. In the construction method of the support-free cantilevered platform, the cantilevered platform structure is constructed step by step. The cantilevered beams are poured first, and then the prefabricated cantilevered platform bottom plate is installed. With the cantilevered beams as the support, no additional construction is required during the installation of the bottom plate The support structure saves cumbersome steps and utilizes the high-strength characteristics of the laminated layers of high-strength truss panels to ensure the stability of the construction of the cantilevered platform floor and overcome the difficulty of building support frames at high altitudes.

6. In the construction method of the support-free cantilevered platform, the connection between the cantilever beam and the bottom plate of the cantilevered platform is reinforced by reinforcing parts or L-shaped clamps to ensure that the joints are firmly connected and the stability of the cantilevered platform structure is ensured. The construction quality has brought great guarantee.

7. The present invention carries out step-by-step construction on the cantilevered platform, uses simple and easy-to-make auxiliary brackets to assist and fix the pouring of the cantilever beam, and then supports it with the help of the cantilever beam, and installs the prefabricated cantilevered platform bottom plate, which can meet the super The load-bearing requirements for the construction of large-scale cantilevered platforms are strong, which simplifies the construction process and saves construction costs. It does not need to build complex and cumbersome support frames, and will not cause damage to the structure of the cantilevered platform itself.

Description of drawings

Fig. 1 is a flow chart of steps of the present invention;

Fig. 2 is the schematic diagram of construction structure of the present invention (double row protective fence is not shown);

Fig. 3 is a partial enlarged view of part A in Fig. 2 of the present invention;

Fig. 4 is a schematic structural view of the auxiliary bracket of the present invention;

Fig. 5 is the construction structure figure of pouring cantilever beam of the present invention;

Fig. 6 is a schematic structural view of the reinforcement component of the present invention.

In the figure, 1 is the rope, 2 is the auxiliary support, 3 is the formwork of the cantilever beam, 4 is the operation platform, 5 is the main structure of the building, 7 is the cantilever beam, 8 is the reinforcement component, 21 is the horizontal beam, 22 is the ring Beam, 41 is the bottom plate of the operation platform, 42 is the main beam, 43 is the diagonal brace, 44 is the web bar, 61 is the upper fixing plate, 62 is the vertical tension bolt, 63 is the secondary keel, 64 is the main keel, and 65 is the horizontal To pull bolt, 66 is lower fixed plate, and 81 is fixed cross bar, and 82 is fixed vertical bar.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

A construction method for a support-free cantilevered platform provided by the present invention comprises the following steps:

Step 1, building main structure 5 construction

Construct the main structure 5 of the building to the position above the elevation of the cantilevered platform, and reserve the height for pulling the rope 1 in the later stage; fix the shear keys for reinforcing the cantilever beam on the main structure 5 of the building, so as to strengthen the main structure 5 of the building and Strong connection between the cantilever beams 7;

Step 2. Set up the operating platform 4

Set up an operating platform 4 below the elevation of the cantilevered platform for construction workers to place materials and perform construction operations;

The operating platform 4 includes several triangular brackets and some connecting beams, and the triangular brackets are fixed on the main structure 5 of the building at uniform radial intervals, and the connecting beams are fixed on the top of the triangular brackets for connecting several Described triangular support; laying console floor 41 on the described triangular support; double rows of protective fences are fixedly installed on the edge of the operating platform 4; The bottom of the main girder 42 is fixed with the diagonal brace 43 , and several webs 44 are fixed between the main beam 42 and the diagonal brace 43 . The bottom plate 41 of the operating platform is a scaffolding board; the height of the double-row protective fence is 1.5m; the connecting beam and the triangular bracket are all made of section steel; the operating platform 4 is fixed on the main structure of the building 5 by high-strength bolts On the top, construction workers stand on the operation platform 4 to carry out follow-up construction;

Step 3: Set up the auxiliary bracket 2

After the construction of the operation platform 4 is completed, an auxiliary support 2 is erected at the elevation of the cantilevered platform to fix the cantilever beam formwork 3; when the auxiliary support 2 is used for subsequent pouring of the cantilever beam 7, the cantilever beam formwork 3 is fixed;

As shown in Figure 3, the auxiliary support 2 includes several horizontal beams 21 and several ring beams 22, and several horizontal beams 21 are radially fixed on the building main structure 5, and the horizontal beams 21 are evenly spaced. The ring beam 22 is fixed on the horizontal beam 21 sequentially from the inside to the outside along the circumferential direction; when the auxiliary bracket 2 is installed, the horizontal beam 21 is installed first, and the horizontal beam 21 is distributed radially around the main structure 5 of the building. After the horizontal beam 21 is installed, several ring beams 22 are installed, and several horizontal beams 21 are connected into a whole, and the horizontal beam 21 and the ring beam 22 are fixed by high-strength bolts; Consistent with the elevation of the top surface of the bottom plate of the cantilevered platform; the horizontal beam 21 is made of I-beam, and the ring beam 22 is made of section steel;

The shape of the above-mentioned auxiliary support 2 is suitable for construction on the main body structure 5 of a tubular building, and the shape of the auxiliary support 2 can be adjusted according to different building structures in actual construction;

Between the horizontal beam 21 and the main structure 5 of the building, several ropes 1 are obliquely drawn, and the ends of several ropes 1 are sequentially fixed at quarter nodes of the horizontal beam 21; 1 is a steel wire rope; due to the heavy weight of the horizontal beam 21, unfavorable torsion and downward deflection are likely to occur. The horizontal beam 21 is tied through the rope 1 to eliminate the deformation caused by the gravity of the horizontal beam 21 and ensure that the structure of the auxiliary support 2 is firm and stable. Ensure that the subsequent construction of the cantilever beam 7 proceeds smoothly;

Step 4: Pouring cantilever beams 7

After the auxiliary support 2 is erected, the cantilever beam template 3 is hoisted at the bottom of the auxiliary support 2, and the cantilever beam 7 is poured;

As shown in Figure 4, the cantilever beam formwork 3 is installed on the bottom of the auxiliary support 2 through hoisting parts; The keel 64, several secondary keels 63 and some transverse tension bolts 65, the upper fixing plate 61 is fixed on the top of the horizontal beam 21, and the lower part of the upper fixing plate 61 is fixed by several vertical tension bolts 62 There is the lower fixing plate 66; two rows of the main keels 64 are symmetrically and vertically fixed on the lower fixing plate 66, and the cantilever beam formwork 3 is fixed on the said main keel 64 between the two rows. On the lower fixing plate 66, two rows of said main keels 64 are fixed by a plurality of said transverse tension bolts 65; There are several lateral joists 63 . The main keel is made of steel pipe, the upper fixing plate 61 and the lower fixing plate 66 are anchor plates, and the transverse tension bolt 65 and the vertical tension bolt 62 are made of round steel;

Step 5. Install the bottom plate of the cantilevered platform

After the pouring of the cantilever beam 7 is completed, a prefabricated cantilever platform bottom plate is fixed on the top of the cantilever beam 7; the cantilever platform bottom plate is made of superimposed high-strength truss plates; Made of high-strength concrete, the surface is roughened, and its high-strength characteristics can realize the support-free installation of the cantilevered platform bottom plate on the cantilever beam 7; the joints of the high-strength truss plates are glued to prevent grout leakage;

The bottom plate of the cantilevered platform is poured with concrete at the joint position of the cantilever beam 7 to be fixedly connected, and a reinforcing part 8 or an L-shaped fixture is installed for reinforcement; the L-shaped fixture is an existing structure, so it will not be described in detail; The reinforcement part 8 includes a fixed cross bar 81 and a plurality of fixed vertical bars 82, the fixed cross bar 81 is fixed on the bottom of the cantilever platform floor, and the bottom of the fixed cross bar 81 is fixed with several fixed vertical bars 82 at intervals, The fixed vertical bar 82 is fixed on the cantilever beam 7;

Step 6. Pouring the floor slab

After the bottom plate of the cantilevered platform is installed, the floor slab is poured on the bottom plate of the cantilevered platform. After the construction of the cantilevered platform is completed, the operation platform 4 and the auxiliary support 2 are removed, and the construction is completed; when the floor is constructed, it is poured from the center to the surroundings , to ensure that the overall force on the cantilevered platform is balanced during the pouring process.

The invention carries out step-by-step construction on the cantilevered platform, uses simple and easy-to-make auxiliary brackets to assist and fix the pouring of the cantilevered beam, and then uses the cantilevered beam to support and install the prefabricated cantilevered platform bottom plate, which can meet the needs of super large cantilevered platforms. It meets the load-bearing requirements of the platform construction, has strong stability, simplifies the construction process, saves construction costs, does not need to build complex and cumbersome support frames, and will not cause damage to the structure of the cantilevered platform itself.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

1. A support-free overhanging platform construction method is characterized in that, comprising the following steps: Step 1, building main structure (5) construction Construct the main structure (5) of the building to the position above the elevation of the cantilevered platform, and reserve the height for pulling the rope (1) in the later stage; Step 2. Set up the operating platform (4) Set up an operating platform (4) below the elevation of the cantilevered platform for construction workers to place materials and perform construction operations; Step 3. Set up the auxiliary bracket (2) After the construction of the operating platform (4) is completed, an auxiliary support (2) is erected at the elevation of the cantilevered platform to fix the cantilevered beam formwork (3); Step 4. Pouring cantilever beams (7) After the auxiliary support (2) is set up, the cantilever beam formwork (3) is hoisted at the bottom of the auxiliary support (2), and the cantilever beam (7) is poured; Step 5. Install the bottom plate of the cantilevered platform After the cantilever beam (7) is poured, a prefabricated cantilever platform bottom plate is fixed on the top of the cantilever beam (7); Step 6. Pouring the floor slab After the bottom plate of the cantilevered platform is installed, the floor slab is poured on the bottom plate of the cantilevered platform. After the construction of the cantilevered platform is completed, the operating platform (4) and the auxiliary support (2) are removed, and the construction is completed. 2. A kind of support-free cantilevered platform construction method according to claim 1, is characterized in that, in described step 2, described operation platform (4) comprises several triangular brackets and some connecting beams, and described triangular bracket diameter Fixedly installed on the main structure (5) of the building at even intervals, the connecting beam is fixed on the top of the triangular bracket for connecting several triangular brackets; ; The edge of the operating platform (4) is fixed with double rows of protective fences; Described triangular support comprises main girder (42), diagonal brace (43) and several web bars (44), and described diagonal brace (43) is fixedly installed at the bottom of described main girder (42), and described main girder (42) and Several web bars (44) are fixed between the diagonal braces (43). 3. The construction method of a support-free cantilevered platform according to claim 1, characterized in that, in the third step, the auxiliary support (2) includes several horizontal beams (21) and several ring beams (22 ), some of the horizontal beams (21) are radially fixed on the building main structure (5), the horizontal beams (21) are evenly spaced, and some of the annular beams (22) are sequentially arranged from inside to outside along the circumferential direction Be fixed on the described horizontal beam (21). 4. The construction method of a support-free cantilevered platform according to claim 3, characterized in that, a number of ropes (1) are obliquely drawn between the horizontal beam (21) and the main structure of the building (5) , the ends of several of the ropes (1) are sequentially fixed at quarter nodes of the horizontal beam (21). 5. The construction method of a support-free cantilevered platform according to claim 3, characterized in that, in said step 4, said cantilever beam formwork (3) is installed on said auxiliary support (2) by means of hoisting parts Bottom; the hoisting parts include an upper fixing plate (61), a lower fixing plate (66), several vertical tension bolts (62), some main keels (64), several secondary keels (63) and some transverse tension bolts (65), the upper fixing plate (61) is fixed on the top of the horizontal beam (21), and the lower part of the upper fixing plate (61) is fixed with the described vertical tension bolts (62) below. Lower fixing plate (66); two rows of main keels (64) are symmetrically and vertically fixed on the lower fixing plate (66), and the cantilever beam formwork (3) is fixed on two rows of main keels ( 64) on the lower fixing plate (66), the two rows of main keels (64) are fixed by a number of transverse pull bolts (65); the main keels (64), the lower Between the fixed plate (66) and the cantilever beam template (3), several horizontal secondary keels (63) are evenly laid. 6. The construction method of a support-free cantilevered platform according to claim 1, wherein in the fifth step, the bottom plate of the cantilevered platform is made of superimposed high-strength truss plates. 7. The construction method of a support-free cantilevered platform according to claim 1, characterized in that, in the fifth step, the joint position of the cantilevered platform floor and the cantilevered beam (7) is fixed by pouring concrete Connect, and install reinforcement components (8) or L-shaped clamps for reinforcement. 8. A construction method for a support-free cantilevered platform according to claim 7, characterized in that, the reinforcement component (8) includes a fixed cross bar (81) and several fixed vertical bars (82), and the fixed horizontal bar The rod (81) is fixed on the bottom of the cantilevered platform floor, and several fixed vertical rods (82) are fixed at the bottom of the fixed horizontal rod (81) at intervals, and the fixed vertical rods (82) are fixed on the bottom of the fixed vertical rod (82). On the cantilever beam (7). 9. A construction method for a support-free cantilevered platform according to claim 1, characterized in that, in the sixth step, the floor slab is poured in a manner of radiating from the center to the surroundings. 10. A kind of support-free cantilevered platform construction method according to claim 1, is characterized in that, in described step 1, on the building main body structure (5), fix the shear resistance that is used for reinforcing cantilever beam (7) key.

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