CN111779248A - High-support formwork system and its construction method - Google Patents

Abstract

The application provides a high formwork system and a construction method thereof, wherein the high formwork system comprises: the cantilever operation platform, the scaffold, the steel beam bracket and the concrete beam column wood formwork bent frame; the scaffold is erected on the cantilever operation platform, and the steel beam bracket is arranged above the cantilever operation platform and used for supporting the suspended beam structure; the steel beam bracket comprises a bracket main body and a bracket inclined strut, two ends of the bracket main body are respectively inserted into the shear walls and are fixedly connected with the shear walls, one end of the bracket inclined strut is fixedly connected with the bracket main body, and the other end of the bracket inclined strut is fixedly connected with an embedded part of the shear walls; the concrete beam column wood formwork bent is arranged on the steel beam bracket. In the high formwork system and the construction method thereof, the mode that the large-section steel shelving beam is matched with the high-altitude overhanging steel platform is adopted, the problem that the high-altitude large-section reinforced concrete member cannot be constructed is solved, a good practical effect can be obtained, and the high formwork system and the construction method thereof have the advantages of low construction difficulty, economy, environmental protection, high safety factor and the like.

Description

High-support formwork system and its construction method

technical field

The invention relates to the technical field of building construction, in particular to a high-support formwork system and a construction method thereof.

Background technique

In the field of high-rise residential construction, in order to highlight the individuality of the individual building design or meet the overall planning requirements of the region, different shapes of concrete flower frame beams, three-dimensional grid structures or steel component shapes are usually designed on the eaves, roofs and other parts, forming a unique design. The shape, and the very modern appearance design, the look and feel effect is excellent.

However, from this, civil construction and decoration construction problems such as the hoisting of high-altitude large-scale steel components, the support of high-altitude suspended reinforced concrete structure formwork, and the high-altitude operation of roof eaves decoration and decoration are derived. Not only the construction process itself is technically difficult, but also It involves a lot of high-altitude operations, and the requirements for anti-fall safety management and control are also very high.

As the scale of the building increases, the rigidity, strength and stability requirements of the high-support formwork system in the reinforced concrete construction are higher, and the difficulty of implementing the formwork construction also increases accordingly. ”, there are generally disadvantages of high construction difficulty and low safety factor. Due to the unskilled construction technology of the high-support formwork system, or the lack of engineering experience, engineering accidents often occur, and at the same time endanger the safety of buildings, and even cause serious damage to life and property.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-support formwork system and a construction method thereof, so as to solve the problems of high construction difficulty and low safety factor in the existing high-support formwork system.

In order to solve the above-mentioned technical problems, the present invention provides a high formwork system, the high formwork system includes: a cantilevered operating platform, a scaffold, a steel beam bracket and a concrete beam, column and wood formwork frame;

The cantilevered operation platform includes a cantilevered main beam, a horizontal coupling beam and a platform plate, the horizontal coupling beam is vertically arranged with the cantilevered main beam, the cantilevered main beam includes an anchoring section and a cantilevered section, and the The anchoring section of the cantilevered main beam is fixed on the designated floor, the cantilevered section of the cantilevered main beam protrudes from the designated floor, and the horizontal coupling beam and the platform plate are both fixed to the cantilevered main beam the cantilever section;

The scaffold is erected on the cantilevered operation platform and fixedly connected with the horizontal coupling beam;

The steel beam bracket is installed above the cantilevered operation platform for supporting the cantilever beam structure;

The steel beam bracket includes a bracket main body and a bracket diagonal brace. Both ends of the bracket main body are respectively inserted into the shelf grooves reserved by the shear wall and are fixedly connected to the shear wall. The bracket diagonal bracing One end of the bracket is fixedly connected to the bracket main body, and the other end of the bracket diagonal brace is fixedly connected to the embedded part of the shear wall;

A concrete beam, column and wood formwork support base is laid on the main body of the bracket, and the concrete beam, column and wood formwork bracket is installed on the concrete beam, column and wood formwork support base.

Optionally, in the high-support formwork system, the cantilevered operation platform further includes a platform diagonal brace, a tie rod and a wire rope;

One end of the platform diagonal brace is fixedly connected to the lower surface of the cantilevered main beam, and the other end of the platform diagonal brace is fixedly connected to the embedded part of the lower floor slab;

One end of the tie rod is fixedly connected to the platform diagonal brace, and the other end of the tie rod is fixedly connected to the cantilevered main beam;

The cantilevered operation platform further comprises a steel wire rope, one end of the steel wire rope is connected with the main beam, and the other end of the steel wire rope is fixedly connected with the embedded part of the upper floor slab.

Optionally, in the high-support formwork system, the concrete beam-column-wood formwork support base includes a plurality of steel pipes, and the plurality of steel pipes are arranged at intervals along the span direction of the steel beam bracket.

Optionally, in the high-support formwork system, the scaffolding includes: a plurality of vertical bars, a plurality of horizontal bars, a wall-attached connection, and a scaffolding board;

The plurality of vertical rods are arranged vertically, and the bottom ends thereof are fixedly connected with the horizontal coupling beam;

The plurality of horizontal bars are arranged horizontally, and are fixedly connected to the plurality of vertical bars through a first fastener;

One end of the wall-attached connection is fixedly connected with the vertical rod, and the other end of the wall-attached connection is fixedly connected with the main structure of the building;

The scaffold board is laid on the horizontal coupling beam.

Optionally, in the high formwork system, the plurality of vertical rods are located at the intersection of the cantilevered main beam and the horizontal coupling beam.

Optionally, in the high-support formwork system, the scaffold further includes hard isolation and a safety net;

The hard isolation is arranged on the attachment wall and the safety net is arranged on the inner side of the plurality of vertical poles and is fixedly connected with the plurality of vertical poles.

Optionally, the high formwork system further includes: a first steel tube bent frame and a second steel tube bent frame;

The first steel tube bent frame is arranged on the top of the cantilevered main beam, and is used to support the cantilevered main beam and the upper floor slab of the designated floor slab;

The second steel tube bent frame is arranged in the corridor of the main structure, and is used to support the designated floor and its lower floor.

Optionally, in the high formwork system, the vertical projections of the first steel tube bent frame and the second steel tube bent frame both fall within the range of the anchoring section of the cantilevered main beam.

Optionally, in the high formwork system, the cantilevered main beam is fixedly connected to the designated floor slab through at least four U-bolts.

Optionally, in the high formwork system, the cantilevered main beam is made of No. 20 I-beam, the horizontal coupling beam is made of No. 16 I-beam, and the bracket body is made of No. 56 I-beam. , the bracket diagonal brace is made of 22-gauge I-beam.

Optionally, in the high-support formwork system, the platform diagonal brace is made of 20-gauge I-beam, and the tie rod is made of 16-gauge channel steel.

Correspondingly, the present invention also provides a construction method of a high-support formwork system, and the construction method of the high-support formwork system includes:

Step 1, constructing the main concrete structure of the floor, and setting embedded parts in the main concrete structure of the floor;

Step 2. Install the overhanging operation platform on the designated floor;

Step 3. Set up an upper layer of scaffolding on the cantilevered operating platform, and construct the upper layer of the main structure. The upper layer of the main structure is reserved with a groove for a steel beam bracket and a first suspended beam. groove;

Step 4. Install a steel beam bracket below the first suspended beam;

Step 5: Make a large-section suspended beam on the steel beam bracket.

Optionally, in the construction method of the high formwork system, the process of installing the overhanging operation platform on the designated floor includes:

The cantilevered main beam, the platform diagonal brace and the tie rod are processed on the ground, and the cantilevered main beam, the platform diagonal brace and the tie rod are formed into a plurality of platform supports;

hoisting the plurality of platform supports in place by a tower crane;

The cantilevered main beam is fixed to the designated floor by at least four U-bolts;

The lower end of the platform diagonal brace is fixedly connected with the embedded part of the lower floor slab;

Lay horizontal coupling beams and platform slabs in sequence on the cantilevered main beams;

The steel wire rope is connected between the cantilevered main beam and the embedded part of the upper floor slab.

Optionally, in the construction method of the high formwork system, before installing the cantilevered operation platform on the designated floor, and after the main concrete structure of the floor is installed, the method further includes: installing a second floor in the corridor of the main structure. Steel tube racks.

Optionally, in the construction method of the high formwork system, before the upper layer of scaffolding is erected on the overhanging operation platform, and after the overhanging operation platform is installed on the designated floor, the method further includes: A first steel tube bent frame is installed on the beam.

Optionally, in the construction method of the high formwork system, the process of erecting a layer of scaffolding on the overhanging operation platform includes:

Fixing the plurality of vertical rods on the horizontal coupling beam, and fixedly connecting the plurality of transverse rods to the plurality of vertical rods through the first fastener;

The two-step two-span embedded method or the through-wall connection method is used to make the wall-attached connection;

spread the scaffolding over the top surface of the horizontal coupling beam; and

Install hard isolation, toe guards, and safety net in sequence.

Optionally, in the construction method of the high formwork system, the process of installing a steel beam bracket below the first suspended beam includes:

Machining the bracket body and bracket braces on the ground to form steel beam brackets;

The steel beam bracket is hoisted into place by a tower crane;

Insert the two ends of the bracket main body into the resting grooves reserved by the main structure of the upper layer respectively, and fix the lower end of the bracket diagonal brace and the embedded part of the shear wall by welding; and

Level and compact the shelving grooves separately with high-fine stone concrete.

Optionally, in the construction method of the high-support formwork system, the process of applying a large-section suspended beam on the steel beam bracket includes:

Lay a plurality of steel pipes on the steel beam bracket as the first concrete beam, column and wood formwork support foundation;

A first concrete beam, column and wood formwork is supported on the foundation of the first concrete beam, column and wood formwork;

carry out concrete placement; and

Concrete curing is carried out until the concrete strength of the first suspended beam meets the design requirements.

Optionally, in the construction method of the high-support formwork system, during the concrete curing process, it also includes: continuing to erect scaffolding on the cantilevered operation platform, and applying the upper layer of structural concrete and the second layer of concrete. Hanging beam.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The present invention adopts the large-section section steel shelving beam combined with the high-altitude cantilever steel platform to solve the problem that the high-altitude large-section reinforced concrete member cannot be constructed, not only can achieve good practical effects, but also has low construction difficulty, excellent economy, and material saving. Environmental protection, high safety factor and many advantages;

2. The high formwork system of the present invention not only uses the designated floor where the cantilever operation platform itself is located as the support, but also uses the floor below the designated floor and the upper floor for support, so that the support effect is better and the support is more stable .

Description of drawings

1 is a schematic diagram of the elevation layout of a high-support formwork system according to an embodiment of the present invention;

FIG. 2 is a schematic plan view of a high-support formwork system according to an embodiment of the present invention;

3 is a schematic diagram of a cross-sectional arrangement of a high-support formwork system according to an embodiment of the present invention;

Fig. 4 is the structural representation of area A in Fig. 1;

Fig. 5 is the structural representation of area B in Fig. 3;

FIG. 6 is a schematic structural diagram of a wall-attached connection using a two-step, two-span embedded method;

Fig. 7 is the structural schematic diagram of the wall-attached connection adopting the through-wall connection method;

8 is a schematic structural diagram of a concrete beam, column and timber formwork bent according to an embodiment of the present invention;

9 is a schematic structural diagram corresponding to step 1 in the construction method of the high-support formwork system according to the embodiment of the present invention;

10 is a schematic structural diagram corresponding to step 3 in the construction method of the high-support formwork system according to the embodiment of the present invention;

11 is a schematic structural diagram corresponding to step 4 in the construction method of the high-support formwork system according to the embodiment of the present invention.

Detailed ways

The high-support formwork system and its construction method proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to FIG. 1 to FIG. 3 , which are schematic structural diagrams of a high-support die system according to an embodiment of the present invention. As shown in FIG. 1 to FIG. 3 , the high formwork system 100 includes: a cantilevered operation platform, scaffolding, steel beam brackets, and concrete beams, columns and timber formwork bent frames; the cantilevered operation platform includes a cantilevered main beam 11, a horizontal A coupling beam 12 and a platform plate (not shown in the figure), the horizontal coupling beam 12 is vertically arranged with the cantilevered main beam 11, the cantilevered main beam 11 includes an anchoring section and a cantilevered section, the cantilevered main beam 11 The anchoring section of the main beam 11 is fixed on the designated floor, the cantilevered section of the cantilevered main beam 11 protrudes from the designated floor, and the horizontal coupling beam 12 and the platform plate are both fixed on the cantilevered main beam. The cantilevered section of the beam 11; the steel beam bracket is installed above the cantilever operation platform, and the steel beam bracket includes a bracket main body 31 and a bracket diagonal brace 32. The ends are respectively inserted into the resting grooves reserved by the shear wall and fixedly connected to the shear wall. One end of the bracket diagonal brace 32 is fixedly connected to the bracket main body 31 , and the bracket diagonal brace 32 is fixedly connected. The other end of the frame is fixedly connected with the embedded part of the shear wall; the bracket main body 31 is laid with a concrete beam, column and wood formwork support foundation, and the concrete beam, column and wood formwork rack is installed on the concrete beam, column and wood formwork support foundation. , the scaffold is erected on the cantilevered operation platform and fixedly connected with the horizontal link beam 12 .

Specifically, the cantilevered main beam 11 includes a plurality of section steels, the plurality of section steels are arranged side by side with equal spacing, each section steel includes an anchoring section and a cantilever section, and the anchoring section is located on a designated floor (for example, the 26th floor). the floor) and fixedly connected with the specified floor by anchors (U-bolts), and the cantilevered section protrudes out of the specified floor.

In this embodiment, the length of the cantilevered main beam 11 is 12m, wherein the length of the anchoring section is 6.7m, and the length of the cantilever section is 5.3m.

In this embodiment, the cantilevered main beam 11 includes seven I-beams of No. 20a, and the seven I-beams of No. 20a are arranged in the horizontal direction.

Preferably, the cantilevered main beam 11 is fixedly connected to the designated floor slab through at least four U-shaped bolts, that is, each 20a I-beam is fixedly connected to the designated floor slab through at least four U-shaped bolts.

Please refer to FIG. 5 , which is a schematic structural diagram of the area B in FIG. 3 . As shown in FIG. 5 , the U-shaped bolts 16 are pre-embedded in the designated floor slab, and the bottom of the U-shaped bolts 16 is pressed by two steel bars 18 pre-embedded in the designated floor slab. The beam 11 is inserted into the U-bolt 16 , and the lateral direction of the cantilevered main beam 11 is fastened by wooden wedges.

In this embodiment, the length of the steel bar 18 is 3m and the diameter is 20mm.

Please continue to refer to FIG. 3 , the distance between the cantilevered main beams 11 (the distance between adjacent No. 20a I-beams) D1 is 1500m, and the cantilevered main beams 11 adjacent to the shear wall are side beams, so The distance D2 between the side beam and the built shear wall is 500mm.

Please refer to FIG. 2 and FIG. 3 , the horizontal coupling beam 12 is vertically arranged with the cantilevered main beam 11 , the horizontal coupling beam 12 is fixed on the cantilevered main beam 11 by welding, and the platform plate (not shown in the figure) is laid on the cantilevered main beam 11, and is fixedly connected to the cantilevered main beam 11 through iron wire binding. Wherein, the horizontal coupling beam 12 also includes a plurality of section steels, and the plurality of section steels are arranged side by side with equal intervals.

In this embodiment, the horizontal coupling beam 12 includes six 16-gauge I-beams, and the six 16-gauge I-beams are arranged in the horizontal direction. The length of the horizontal coupling beam 12 (that is, the length of the 16-gauge I-beam ) is 10 meters, and the distance between the horizontal coupling beams 12 (the distance between adjacent 16-gauge I-beams) D3 is between 500 and 800 mm.

Please continue to refer to FIG. 3 , the cantilevered operation platform further includes a platform diagonal brace 13 , a tie rod 14 and a wire rope 15 . The upper end of the platform diagonal brace 13 is fixedly connected to the lower surface of the cantilevered main beam 11 . The lower end of the platform diagonal brace 13 is fixedly connected to the first embedded part of the lower floor (for example, the floor slab of the 25th floor), the angle between the platform diagonal brace 13 and the horizontal plane is α, and one end of the tie rod 14 It is fixedly connected to the platform diagonal brace 13, the other end of the tie rod 14 is fixedly connected to the cantilevered section of the cantilevered main beam 11, and one end of the wire rope 15 is fixedly connected to the cantilevered main beam 11, The other end of the wire rope 15 is fixedly connected to the second embedded part of the upper floor (for example, the floor on the 27th floor). With the help of the pulling effect of the wire rope 15, the structural stability of the cantilevered operation platform can be further improved sex to prevent it from overturning.

In this embodiment, the cantilevered operation platform is a high-altitude cantilevered steel platform, and the bottom of each cantilevered main beam 11 is provided with a platform diagonal brace 13 and a tie rod 14, so that the slenderness ratio of the diagonal brace can be reduced, Make sure the braces are safe.

In this embodiment, the platform diagonal brace 13 is made of 20-gauge I-beam, the tie rod 14 is made of 16-gauge channel steel, and the included angle between the platform diagonal brace 13 and the horizontal plane is 45°.

Please refer to Fig. 3, Fig. 6 and Fig. 7 in combination, the scaffolding comprises a plurality of vertical rods 21, a plurality of horizontal rods 22, a wall-attached connection (not shown in the figure) and a scaffolding board (not shown in the figure), The plurality of vertical bars 21 are arranged vertically, and the bottom ends thereof are fixedly connected to the horizontal coupling beam 12. The plurality of horizontal bars 22 are arranged horizontally and pass through a first fastener (not shown in the figure) It is fixedly connected with the plurality of vertical rods 21, the scaffolding board is fully spread on the top surface of the horizontal coupling beam 12, one end of the wall-attaching connection is fixedly connected with the scaffold, and the wall-attaching connection is fixedly connected. The other end of the scaffold is fixedly connected with the shear wall, and the wall attachment is used to transmit the tension and pressure generated by the scaffold during use, which can enhance the overall stability of the scaffold.

In this embodiment, the wall attachment is performed by a two-step, two-span embedded method or a through-wall connection method. As shown in FIG. 6 , the attachment wall connection made by the two-step, two-span embedded method includes connecting wall rods 231, second fasteners 232 and embedded steel pipes 233. The embedded steel pipes 233 are embedded in the shear wall. One end of the connecting wall rod 231 is fixedly connected to the embedded steel pipe 233 through a second fastener 232, and the other end of the connecting wall rod 231 is connected to the scaffolding through another second fastener 232. The rods 21 are fixedly connected, whereby the scaffolding is connected with the main structure of the building through the attachment wall pull connection.

As shown in FIG. 7 , the wall-attaching connection performed by the through-wall connection method includes a connecting wall rod 231 and a second fastener 232. One end of the connecting wall rod 231 penetrates through the shear wall and passes through the second fastener. 232 is fixedly connected to the shear wall, and the other end of the connecting wall rod 231 is fixedly connected to the vertical rod 21 of the scaffolding through the second fastener 232, so that the scaffolding is connected to the main body through the attachment wall structure is connected.

In this embodiment, the plurality of vertical bars 21 and the plurality of horizontal bars 22 are steel pipes, and the plurality of vertical bars 21 are arranged in 6 rows in the transverse direction and 7 rows in the longitudinal direction, and the longitudinal spacing is 1.5m , the horizontal spacing is 500-1500 mm, the step distance of the plurality of cross bars 22 is 1.5 m, and the first fastener is a right-angle fastener. Preferably, the plurality of vertical rods 21 are located at the intersection of the cantilevered main beam 11 and the horizontal coupling beam 12 .

Please continue to refer to FIG. 3, FIG. 6 and FIG. 7, the scaffold further includes hard isolation (not shown in the figure), a foot plate (not shown in the figure) and a safety net (not shown in the figure). The isolation is arranged on the attachment wall, and the hard isolation includes two steel pipes, a third fastener and a steel fence. The two steel pipes are arranged horizontally and are fixedly connected by the third fastener. The steel fence is laid on the two steel pipes, the foot guard is arranged at the bottom of the plurality of vertical poles 21, and is fixedly connected with the plurality of vertical poles 21, and the safety net is arranged on the plurality of vertical poles 21. The inner side of the rod 21 is fixedly connected with the plurality of vertical rods 21 .

In this embodiment, the surrounding outer corners of the scaffolding are arranged along the vertical length and full height of the outer frame, the scaffolding board is a steel fence piece scaffolding board, and the foot retaining board adopts a seven plywood with a height of 180mm. The safety net is a green dense mesh safety net, and the entire height of the vertical pole 21 is covered with a green dense mesh safety net to form a fully enclosed operating space to ensure that workers operate Safety.

Please refer to FIG. 3 and FIG. 8 , the scaffold also includes a sweeping rod 24 , a capping rod 25 , a horizontal rod 26 , a horizontal scissor support (not shown in the figure) and a vertical scissor support. The sweeping rod 24 is provided with At the bottom of this layer of scaffolding, the capping bar 25 is arranged on the top of the scaffolding, the horizontal bar 26 is arranged between the sweeping bar 24 and the capping bar 25, the horizontal scissor support and the vertical Scissor braces are set according to building code requirements.

In this embodiment, the distance between the sweeping rod 24 and the scaffolding board is 200 mm, the distance between the capping rod 25 and the adjustable jack is less than 500 mm, and the step distance of the horizontal rod 26 is less than 1200 mm.

Please refer to FIG. 1 and FIG. 4 , the steel beam bracket includes a bracket main body 31 and two bracket diagonal braces 32 , the bracket main body 31 is arranged horizontally, and its two ends are respectively inserted into the shear walls reserved. Resting in the groove and fixedly connected to the shear wall, one end of the two bracket diagonal braces 32 is fixedly connected to the bracket main body 31, and the other ends of the two bracket diagonal braces 32 are both It is fixedly connected with the embedded parts of the shear wall. Wherein, the two bracket diagonal braces 32 are arranged symmetrically, and are required to provide sufficient supporting force and supporting area.

In this embodiment, the bracket main body 31 is made of 56-gauge I-beam, the bracket diagonal support 32 is made of 22-gauge I-beam, and the angle between the bracket diagonal support 32 and the horizontal plane ranges from 10° to 75° °.

Preferably, the structural dimensions of the two bracket diagonal braces 32 are the same, and the two bracket diagonal braces 32 are located at the same height.

Please refer to FIG. 1 and FIG. 8 , the bracket main body 31 is laid with a concrete beam, column and wood formwork support foundation, and the concrete beam, column and wood formwork support foundation includes a plurality of steel pipes 41 , and the plurality of steel pipes 41 are laid flat on the The bracket main body 31 is arranged in sequence along the span direction of the steel beam bracket, and the adjacent steel pipes 41 keep a certain distance.

In this embodiment, the plurality of steel pipes 41 are arranged in parallel and equidistant, and the lengths are all 750 mm.

In this embodiment, the plurality of steel pipes 41 and the short steel pipes are also used as the main keel of the formwork, the concrete beams, columns and wooden formwork brackets 42 are installed on the plurality of steel pipes 41, and the concrete beams, columns and wooden formwork brackets 42 use conventional wood formwork The bent frame system is composed of horizontal rods, vertical rods, sweeping rods, plywood formwork, and tie bolts.

It should be noted that the above-mentioned cantilevered main beam 11, horizontal coupling beam 12, platform diagonal brace 13, tie rod 14, vertical rod 21, cross rod 22, foot guard, sweeping rod 24, capping rod 25, horizontal rod 26, bracket The specifications, dimensions, angles and spacings of the frame main body 31, the bracket diagonal braces 32 and the steel pipes 41 are only examples and are not limited. The size, angle and spacing of the platform diagonal braces 13, tie rods 14, vertical rods 21, cross rods 22, bracket main body 31, bracket diagonal braces 32 and steel pipes 41 are set as long as they meet the requirements of building codes.

Please continue to refer to FIG. 2, the high formwork system 100 further includes a first steel tube bent frame 51 and a second steel tube bent frame 52. The top of the first steel tube bent frame 51 is in contact with the upper floor of the designated floor, so The bottom end of the first steel tube bent frame 51 is in contact with the cantilevered main beam 11, and is used to support the cantilevered main beam 11 and the upper floor of the designated floor slab. In the corridor of the main structure, it is used to support the designated floor and the floor below it. The first steel tube bent frame 51 forms an effective press-down connection to the anchoring section of the cantilevered main beam 11 to form an additional top support measure for resisting the warping force of the anchoring section. The second steel tube bent frame 52 and the first steel tube bent frame 51 together form an additional top support measure to prevent structural damage.

Preferably, the second steel tube bent frame 52 is arranged in the corridor on the third floor of the main structure. For example, the designated floor slab is the floor slab of the 26th floor, and the second steel tube bent frame 52 is arranged between the floor slabs of the 24th floor, the 25th floor and the 26th floor, and is used to support the 24th to 26th floors. floor.

Preferably, the projections of the first steel tube bent frame 51 and the second steel tube bent frame 52 in the vertical direction both fall within the range of the anchoring section of the cantilevered main beam 11 .

In this embodiment, the cantilevered operation platform is erected on the designated floor of the building, and the steel beam bracket is installed above the cantilevered operation platform as the force-bearing foundation of the suspended large-section concrete beam, column and wood formwork bent frame , The cantilever operation platform not only serves as a construction operation platform, but also bears the dead weight of the suspended concrete structure and all the construction load pressure.

For the construction of large-section suspended beams, formwork support is the key link. In the prior art, the suspended concrete structure is constructed by using floor scaffolding or cantilever platform + formwork bent frame, but for the suspended concrete structure with large volume and heavy weight, the existing construction method cannot guarantee the safety, that is, The existing high-support formwork system cannot meet the construction requirements.

In the high-support formwork system 100 provided in this embodiment, the steel beam bracket is a large-section shaped steel shelving beam, and the large-section shaped steel shelving beam is combined with a high-altitude cantilevered steel platform to solve the problem of high-altitude large-section reinforced concrete components (high It can not only achieve good practical results, but also has many advantages such as low construction difficulty, excellent economy, material saving and environmental protection, and high safety factor. It has advantages in safety, economy and practicability. . In addition, the high formwork system 100 not only uses the designated floor where the cantilever operation platform itself is located as the support, but also uses the floor below the designated floor and the upper floor for support, so that the support effect is better and the support is more stable .

Correspondingly, the present application also provides a construction method for a high formwork system. Please refer to FIG. 1 to FIG. 3 and FIG. 9 to FIG. 11 , the construction method of the high-support formwork system 100 includes:

Step 1, constructing the main concrete structure of the floor, and setting embedded parts in the main concrete structure of the floor;

Step 2. Install the overhanging operation platform on the designated floor;

Step 3: Set up an upper layer of scaffolding on the cantilevered operation platform, and construct the upper layer of the main structure. groove;

Step 4. Install a steel beam bracket below the first suspended beam;

Step 5, laying the first concrete beam, column and wood formwork support foundation on the steel beam bracket;

Step 6: Support the first concrete beam and column wood formwork on the foundation of the first concrete beam and column wood formwork support, and carry out concrete pouring.

Specifically, first, as shown in FIG. 9 , when constructing the main concrete structure of the floor, a first embedded part 1a and a second embedded part (not shown in the figure) are respectively arranged on the edge of the floor slab. The embedded part 1a is located on the lower floor of the designated floor and is used as a welding point for the lower diagonal bracing of the cantilevered main beam.

Next, install the cantilevered operating platform on the designated floor. The specific process of installing the cantilever operating platform includes:

In step S21, the cantilevered main beam 11, the platform diagonal brace 13 and the tie rod 14 are processed on the ground, and one end of the tie rod 14 is fixedly connected to the platform diagonal brace 13 by welding. The other end of 14 is fixedly connected to the cantilevered section of the cantilevered main beam 11, and one end of the platform diagonal brace 13 is fixedly connected to the cantilevered section of the cantilevered main beam 11. Each cantilevered main beam 11 ( That is, a single No. 20a I-beam) is welded and fixed with a platform diagonal brace 13 and a tie rod 14 to form a platform support;

Step S22, supporting and hoisting each platform on the designated floor by the tower crane;

Step S23, fixing the cantilevered main beam 11 on the designated floor (for example, the floor on the 26th floor) through at least four U-bolts;

Step S24, fixing the lower end of the platform bracing 13 to the first embedded part 1a in the lower floor (eg, the floor of the 25th floor) by welding;

Step S25, laying the horizontal coupling beam 12 and the platform plate in sequence on the cantilevered main beam 11;

Step S26, connecting the steel wire rope 15 between the cantilevered main beam 11 and the second embedded part of the upper floor slab.

Before installing the overhanging operating platform, additional top support measures can be added to the completed structural floor to prevent structural damage. The specific process of adding additional roof support measures includes: arranging a second steel tube bent frame 52 in the corridor of the main structure to support the designated floor slab and its lower floor slabs.

After the installation of the cantilevered operating platform, additional roof support measures can be continued in the completed structural floor. The specific process of adding additional roof support measures includes: fixing a first steel tube bent frame 51 on the cantilevered main beam 11 to support the cantilevered main beam 11 and the upper floor slab of the designated floor slab.

As shown in FIG. 3 , the projections of the first steel tube bent frame 51 and the second steel tube bent frame 52 in the vertical direction are required to fall within the range of the anchoring section of the cantilevered main beam 11 .

Then, a layer of scaffolding and a side guard frame are erected on the cantilevered operation platform, and the side guard frame is used for hanging a guard net. The specific process of setting up the upper layer of scaffolding on the cantilevered operating platform includes:

Step S31, fixing the plurality of vertical rods 21 on the horizontal coupling beam 12, and fixedly connecting the plurality of transverse rods 22 to the plurality of vertical rods 21 through the first fastener;

Step S32, using the two-step two-span embedded method or the through-wall connection method to perform the wall-attached pull connection;

Step S33, fully spread the scaffold board on the top surface of the horizontal coupling beam 12;

Step S34, install the hard isolation, the foot guard and the safety net in sequence.

In the process of erecting the upper layer of scaffolding on the cantilevered operation platform, the upper layer of the main structure is constructed, and grooves for steel beam brackets are reserved in the shear wall of the upper layer of the main structure according to the design. And the groove of the first suspended beam.

1 and 10, the groove of the steel beam bracket includes a resting groove 102, and the resting groove 102 is located below the groove 101 of the first suspended beam for resting the The bracket body 31 of the steel beam bracket.

After the formwork of the resting groove is removed, the steel beam bracket is installed. The specific process of installing the steel beam bracket includes:

Step S41: Process the bracket main body 31 and the two bracket diagonal braces 32 on the ground, and fix one end of the two bracket diagonal braces 32 on the bracket main body 31 to form a steel beam bracket shelf;

Step S42, hoisting the steel beam bracket in place by a tower crane;

Step S43, inserting the two ends of the bracket main body 31 into the reserved recesses of the main body structure (shear wall) on the upper layer respectively;

Step S44, leveling, and using high-fine stone concrete to pour and compact the resting grooves respectively.

Before using the high-fine stone concrete to densify the resting groove, the horizontal bars in the shear wall should be resumed to lengthen, and the bracket diagonal braces 32 are fixedly connected to the embedded parts of the shear wall. As shown in FIG. 4 , the lower end of the bracket diagonal brace 32 is fixedly connected to the third embedded part 1d of the main structure (shear wall) by welding.

As shown in FIG. 11 , the bracket main body 31 of the steel beam bracket is placed in the resting groove 102 , and the high-fine stone concrete is used to pour and compact the resting groove 102 respectively. The frame is fixedly installed under the groove 101 of the first suspended beam, and is integrated with the shear wall.

In this embodiment, the width of the resting groove is 200 mm and the depth is 700 mm, and the width of the groove of the first suspended beam is 600 mm and the depth is 400 mm.

After the installation of the steel beam bracket is completed, the construction of the large-section suspended beam structure begins. The specific process of constructing the large-section suspended beam structure includes: first, laying a plurality of short steel pipes on the steel beam bracket, and the plurality of short steel pipes are laid flat along the span direction of the steel beam bracket, as The first concrete beam and column wood formwork support foundation; then, on the first concrete beam and column wood formwork support foundation, the first concrete beam and column wood formwork is supported, and the first concrete beam and column wood formwork (including bottom form and side formwork) Reinforcement is used for binding; then, the concrete is poured, and the suspenders are reserved during the concrete pouring process, and then the concrete is cured until the concrete strength of the first suspended beam and the suspenders meet the design requirements.

In the process of concrete maintenance, scaffolding can be continued on the cantilevered operating platform, and the upper layer of structural concrete and the second suspended beam and hanging column can be installed. After the construction of the second suspended beam and hanging column is completed, scaffolding can be continued on the cantilevered operation platform, the third suspended beam and hanging column can be installed, and the remaining structural shear walls and floor slabs can be installed to the top of the design structure. elevation.

Please continue to refer to Figure 1. When erecting the scaffold, the frame body is provided with safety protection structures such as steel tube hard-tie knots 28.

In this embodiment, a total of three suspended beams are implemented, namely the first suspended beam 10, the second suspended beam 20 and the third suspended beam 30. The first suspended beam and the second suspended beam are The dimensions are all 600mm×400mm, and the dimensions of the third suspended beam are 600mm×1000mm.

In other embodiments, only one suspended beam, two suspended beams, or more than four suspended beams may be implemented according to design requirements.

After all the suspended beams and hanging columns are completed, remove the concrete beams, columns and wooden formwork brackets 42, steel beam brackets, scaffolding, horizontal coupling beams 12 and scaffolding boards, and cantilevered main beams 11 in sequence.

To sum up, in the high-support formwork system and its construction method provided by the present invention, the large-section section steel shelving beam is used with the high-altitude cantilevered steel platform, which solves the problem that the high-altitude large-section reinforced concrete member cannot be constructed, and not only can achieve good results. It has many advantages such as low construction difficulty, excellent economy, material saving and environmental protection, and high safety factor.

The above content is a further detailed description of the present application in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present application is limited to these descriptions. For those of ordinary skill in the technical field of the present application, without departing from the concept of the present application, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present application.

Claims (19)

1. A high formwork system, comprising: the cantilever operation platform, the scaffold, the steel beam bracket and the concrete beam column wood formwork bent frame;

the cantilever operation platform comprises a cantilever girder, a horizontal coupling beam and a platform plate, wherein the horizontal coupling beam is perpendicular to the cantilever girder, the cantilever girder comprises an anchoring section and a cantilever section, the anchoring section of the cantilever girder is fixed on a specified floor slab, the cantilever section of the cantilever girder extends out of the specified floor slab, and the horizontal coupling beam and the platform plate are both fixed on the cantilever section of the cantilever girder;

the scaffold is erected on the overhanging operation platform and is fixedly connected with the horizontal coupling beam;

the steel beam bracket is arranged above the cantilever operation platform and used for supporting a suspended beam structure;

the steel beam bracket comprises a bracket main body and a bracket inclined strut, two ends of the bracket main body are respectively inserted into a reserved laying groove of the shear wall and are fixedly connected with the shear wall, one end of the bracket inclined strut is fixedly connected with the bracket main body, and the other end of the bracket inclined strut is fixedly connected with an embedded part of the shear wall;

concrete beam column wood formwork erection foundation is paved on the bracket main body, and the concrete beam column wood formwork bent is installed on the concrete beam column wood formwork erection foundation.

2. The high formwork system defined in claim 1, wherein the overhanging operation platform further comprises platform diagonal braces, tie bars and wire ropes;

one end of the platform diagonal brace is fixedly connected with the lower surface of the overhanging main beam, and the other end of the platform diagonal brace is fixedly connected with an embedded part of a lower floor slab;

one end of the tie bar is fixedly connected with the platform inclined strut, and the other end of the tie bar is fixedly connected with the overhanging main beam;

the cantilever operation platform further comprises a steel wire rope, one end of the steel wire rope is connected with the main beam, and the other end of the steel wire rope is fixedly connected with the embedded part of the upper floor.

3. The high formwork system of claim 1, wherein the concrete beam column wood formwork support foundation comprises a plurality of steel pipes, and the plurality of steel pipes are arranged at intervals along the span direction of the steel beam bracket.

4. The high formwork system defined in claim 1, wherein the scaffolding comprises: a plurality of upright posts, a plurality of cross rods, wall-attached pulling joints and scaffold boards;

the vertical rods are vertically arranged, and the bottom ends of the vertical rods are fixedly connected with the horizontal coupling beam;

the plurality of cross rods are horizontally arranged and are fixedly connected with the plurality of upright rods through first fasteners;

one end of the wall-attached drawing joint is fixedly connected with the upright stanchion, and the other end of the wall-attached drawing joint is fixedly connected with the main structure of the building;

the scaffold boards are laid on the horizontal coupling beams.

5. The high formwork system defined in claim 4, wherein the vertical rods are located at the intersection of the main cantilever beam and the horizontal coupling beam.

6. A high formwork system according to claim 4, wherein the scaffolding further comprises a hard insulation and safety net;

the hard isolation is arranged on the wall-attached pulling joint, and the safety net is arranged on the inner sides of the upright posts and fixedly connected with the upright posts.

7. The high formwork system defined in claim 1, further comprising: the steel pipe bent frame comprises a first steel pipe bent frame and a second steel pipe bent frame;

the first steel pipe bent is arranged above the cantilever girder and used for propping up the cantilever girder and an upper floor slab of the specified floor slab;

the second steel pipe bent is arranged in the corridor of the main body structure and used for supporting the appointed floor slab and the lower floor slab thereof.

8. The high formwork system of claim 7, wherein the projections of the first steel pipe bent and the second steel pipe bent in the vertical direction both fall within the range of the anchoring section of the cantilever girder.

9. The high formwork system of claim 1, wherein the overhanging main beam is fixedly connected with the designated floor slab through at least four U-shaped bolts.

10. The high formwork system of claim 1, wherein the overhanging main beam is made of 20I-steel, the horizontal coupling beam is made of 16I-steel, the bracket main body is made of 56I-steel, and the bracket diagonal brace is made of 22I-steel.

11. The high formwork system defined in claim 2, wherein the platform diagonal brace is made of 20-gauge I-steel and the tie bar is made of 16-gauge channel steel.

12. A construction method of a high formwork system is characterized by comprising the following steps:

step one, constructing a main floor concrete structure, and arranging an embedded part in the main floor concrete structure;

step two, installing an overhanging operation platform on the appointed floor;

thirdly, building a layer of scaffold on the overhanging operation platform, constructing a layer of main structure, and reserving a groove of the steel beam bracket and a groove of the first suspended beam in the layer of main structure;

fourthly, mounting a steel beam bracket below the first suspended beam;

and fifthly, constructing a large-section suspended beam on the steel beam bracket.

13. The method for constructing a high formwork system, as claimed in claim 12, wherein the process of installing the cantilever operation platform on the designated floor slab comprises:

processing the cantilever main beam, the platform diagonal brace and the tie bars on the ground, and forming a plurality of platform supports by the cantilever main beam, the platform diagonal brace and the tie bars;

hoisting the plurality of platform supports in place through a tower crane;

fixing the cantilever girder on the appointed floor slab through at least four U-shaped bolts;

fixedly connecting the lower end of the platform inclined strut with an embedded part of a lower floor slab;

laying a horizontal coupling beam and a platform plate on the overhanging main beam in sequence;

and connecting the steel wire rope between the overhanging main beam and the embedded part of the upper floor.

14. The method for constructing a high formwork system, as claimed in claim 12, further comprising, before installing the cantilever operation platform on a designated floor, after constructing a floor main concrete structure: and a second steel pipe bent is arranged in the corridor of the main body structure.

15. The method for constructing a high formwork system, according to claim 12, wherein before the step of building a previous scaffold on the overhanging work platform, after the step of installing the overhanging work platform on a specified floor, the method further comprises: and a first steel pipe bent is arranged on the cantilever girder.

16. The method for constructing a high formwork system according to claim 12, wherein the process of building a scaffold on the overhanging work platform comprises:

fixing a plurality of upright posts on the horizontal coupling beam, and fixedly connecting a plurality of cross rods with the upright posts through first fasteners;

adopting a two-step two-span pre-embedding method or a through wall body connecting method to carry out wall attachment pulling connection;

fully paving scaffold boards on the top surfaces of the horizontal coupling beams; and

and a hard isolation plate, a foot baffle plate and a safety net are sequentially installed.

17. A method of constructing a high formwork system as claimed in claim 12, wherein the process of installing a steel beam bracket under the first suspended beam comprises:

processing the bracket main body and the bracket inclined strut on the ground to form a steel beam bracket;

hoisting the steel beam bracket in place through a tower crane;

inserting two ends of the bracket main body into the reserved laying grooves of the upper layer of main body structure respectively, and fixedly connecting the lower end of the bracket diagonal brace with the embedded part of the shear wall in a welding mode; and

leveling, and respectively pouring and compacting the placing grooves by using high and fine stone concrete.

18. The method of constructing a high formwork system as claimed in claim 12, wherein the process of constructing a large-section suspended girder on the girder bracket comprises:

laying a plurality of steel pipes on the steel beam bracket to serve as a first concrete beam column wood formwork supporting foundation;

erecting a first concrete beam column wood formwork on the first concrete beam column wood formwork erecting basis;

pouring concrete; and

and (5) performing concrete curing until the concrete strength of the first suspended beam meets the design requirement.

19. The method for constructing a high formwork system according to claim 18, wherein the concrete curing process further comprises: and continuously erecting a scaffold on the overhanging operation platform, and constructing a previous layer of structural concrete and a second suspended beam.

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