CN111749456B - Synchronous construction method for cantilever structure and tower body main body of lookout tower - Google Patents

Synchronous construction method for cantilever structure and tower body main body of lookout tower Download PDF

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Publication number
CN111749456B
CN111749456B CN202010688992.7A CN202010688992A CN111749456B CN 111749456 B CN111749456 B CN 111749456B CN 202010688992 A CN202010688992 A CN 202010688992A CN 111749456 B CN111749456 B CN 111749456B
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cantilever structure
construction
structure layer
main body
tower
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CN111749456A (en
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赵林
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Jiangsu Jiangjian Group Co ltd
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Jiangsu Jiangjian Group Co ltd
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/06Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
    • E04G11/20Movable forms; Movable forms for moulding cylindrical, conical or hyperbolical structures; Templates serving as forms for positioning blocks or the like
    • E04G11/22Sliding forms raised continuously or step-by-step and being in contact with the poured concrete during raising and which are not anchored in the hardened concrete; Arrangements of lifting means therefor
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14Conveying or assembling building elements

Abstract

The invention discloses a synchronous construction method of a cantilever structure and a tower body main body of a lookout tower, relates to the technical field of buildings, and is used for synchronously constructing a cantilever structure layer in the sliding mode construction process of the tower body main body. After the construction of the lower floor slab of the cantilever structure layer is completed, the template support frame for the construction of the upper floor slab is built on the basis of the lower floor slab, and the template support frame is more convenient, time-saving and safe. After finishing the upper floor slab and the lower floor slab of the cantilever structure layer, the slip form construction of the tower body main body above the cantilever structure layer is continued, and the original slip form system of the tower body main body can be fully utilized. The cantilever structure layer formed by the method has no construction joint with the tower body main body, and has good structural integrity and high integral strength.

Description

Synchronous construction method for cantilever structure and tower body main body of lookout tower
Technical Field
The invention relates to the technical field of buildings, in particular to a high-rise building construction technology with an overhanging structural layer.
Background
A lookout tower belongs to a high-rise structure, and is generally provided with one or more than one overhanging structural layer at different heights of a tower body main body, so that people can observe outwards in the overhanging structural layer, and corresponding lookout equipment can be arranged.
Along with the characteristics of high efficiency and rapidness in a high-rise building, the slip form construction process is also introduced into the construction process of a tower body main body of the observation tower by people, the construction method of the current observation tower is that the slip form construction process is firstly adopted to complete the construction of the tower body main body of the whole observation tower, and then the construction of an overhanging structural layer is carried out, and the existing construction process has the defects that:
1. the construction joint of the cantilever structure is arranged at the maximum shearing force, and the reserved position of the construction joint is unreasonable.
2. The integral performance between the post-cast cantilever structure and the main body is not as good as that of one-step integral casting.
Disclosure of Invention
Aiming at the defects existing in the construction, the invention provides a synchronous construction method of the cantilever structure and the tower body main body of the observation tower, which has the advantages of high efficiency, time saving and complete structure.
The method comprises the steps of slipform construction of a tower body main body below an overhanging structural layer, slipform construction of a tower body main body between overhanging structural layers, slipform construction of a tower body main body above the overhanging structural layer and construction of the overhanging structural layer; the construction of the cantilever structure layer comprises the construction of a lower floor slab of the cantilever structure layer and the construction of an upper floor slab of the cantilever structure layer; the method is characterized in that: after the tower body main body below the cantilever structure layer is constructed to the lower opening of the lower floor slab of the cantilever structure layer in a sliding mode, a template of the tower body main body is made to slide to the upper opening of the lower floor slab of the suspension structure layer in an empty mode, a temporary steel platform is then set up, a template supporting frame for the lower floor slab construction of the cantilever structure layer is then set up on the temporary steel platform, after the lower floor slab of the cantilever structure layer is formed, the tower body main body sliding construction between the cantilever structure layers is carried out, then the tower body main body sliding construction between the cantilever structure layers is stopped until the lower opening of the upper floor slab of the cantilever structure layer, the template of the tower body main body is made to slide to the upper opening of the designed upper floor slab of the suspension structure layer in an empty mode, then a template supporting frame for the upper floor slab construction of the cantilever structure layer is set up on the lower floor slab of the cantilever structure layer, after the upper floor slab of the cantilever structure layer is formed, the tower body main body sliding construction above the cantilever structure layer is carried out in a sliding mode, And (5) dismantling the temporary steel platform.
The invention embodies the idea of synchronously carrying out construction of the cantilever structure layer in the slip form construction process of the tower body main body. After the construction of the lower floor slab of the cantilever structure layer is completed, the template support frame for the construction of the upper floor slab is built on the basis of the lower floor slab, and the template support frame is more convenient, time-saving and safe. After finishing the upper floor slab and the lower floor slab of the cantilever structure layer, the slip form construction of the tower body main body above the cantilever structure layer is continued, and the original slip form system of the tower body main body can be fully utilized. The cantilever structure layer formed by the construction method has no construction joint with the tower body main body, and has good structural integrity and high overall strength.
Specifically, when the slip form construction of the tower body main body below the cantilever structure layer is carried out, an upper layer of embedded parts and a lower layer of embedded parts are circumferentially and equidistantly placed, after the concrete strength of the tower body main body below the cantilever structure layer reaches the standard, a steel support is welded between the upper layer of embedded parts and the lower layer of embedded parts, a top ring beam is installed on the steel support, and a temporary steel platform is formed after wood is fully paved on the steel support and the top ring beam. According to the invention, the embedded parts are placed in the concrete pouring process of the tower body main body below the cantilever structure layer, the temporary steel platform is arranged on the embedded parts and serves as a lower floor construction platform of the cantilever structure layer, so that a full-space support for the construction of the lower floor with the cantilever structure layer erected upwards from the ground is avoided, and the manpower, material resources and financial resources are greatly saved. The embedded part is used as an acting point of the temporary steel platform, and the temporary steel platform can be guaranteed to have strong stability.
When the sliding formwork of the tower body main body slides to the elevation of the embedded parts at the upper layer, the embedded parts at the upper layer and the lower layer need to be completely discharged out of the formwork, and the sliding formwork construction is stopped; through connecting interim stores pylon on body of the tower main part slipform system, operating personnel uses interim stores pylon to carry out the welding of steel support as operation platform. The method is adopted to solve the problem of an operation platform of operators, saves engineering technical measure cost and is safe.
When the steel support is welded, the tower crane is used as vertical transportation equipment, the radiation beam of the slip form system is used as a hoisting point, and the 2T chain block is used for auxiliary installation, so that the existing resources can be fully utilized.
And pre-burying a PVC pipe in the lower floor slab of the cantilever structure layer to form a through hole penetrating through the lower floor slab. The through hole can be utilized in the subsequent process of construction, namely, a hanging basket hanging rope penetrates through the embedded PVC pipe and a steel wire rope for removing the temporary platform, and the lower end of the hanging rope is connected with a hanging basket for an operator to take and place a small tool when the temporary steel platform is removed. By utilizing the pipe holes, the problem of hanging points of steel members and operators taking the hanging baskets in the process of disassembling the temporary steel platform is solved.
Drawings
Fig. 1 is a schematic view of the connection between the steel support, the temporary hanging rack, the tower body main body and the sliding system.
Fig. 2 is a top view of a lower floor slab with embedded PVC pipes.
Fig. 3 is a schematic view of the fixed connection of the body main body sliding system before idle sliding.
Detailed Description
Firstly, engineering target:
the main body of the gazebo tower body is a circular silo with the total height of 101.50 m, an annular cantilever structure layer with the layer height of 4m is arranged at the position of 43-47 m, and the thickness of the upper floor slab and the lower floor slab of the cantilever structure layer is 0.2 m.
Secondly, construction steps:
as shown in fig. 1, 2 and 3:
1. through the sliding lifting system 1, the tower body main body 2 of the 43 m circular silo lookout tower from the ground is constructed by adopting a normal sliding mode.
When the initial height of the slip form reaches the height of the hanging rack required by installation, a plurality of groups of temporary hanging racks 4 are connected on a sliding system on the periphery of the tower body main body through hanging pieces 3.
In the concrete pouring process of the tower body, a plurality of embedded parts extending out of the outer surface of the outer wall of the tower body are respectively placed on the upper layer and the lower layer in an annular mode, each layer is provided with 32 embedded parts, and the upper layer embedded parts and the lower layer embedded parts are arranged in pairs to form 32 pairs of embedded parts.
The center elevation of the upper embedded part is 41.035 m.
Design basis: 43 m (floor height) -0.2 m (plate thickness) -1.5 m (cast-in-place plate supporting scaffold operation height) -0.14 m (GL 2 steel ring beam height) -0.125 m (upper embedded part center elevation) =41.035 m.
The center elevation of the lower embedded part is 37.035 m.
Design basis: 41.035m-4m =37.035 m.
2. And (5) mounting a section steel cantilever platform.
When the template of the tower body main body slides to the elevation of the upper embedded part, the outer ends of the upper and lower embedded parts all extend out of the template, and the template stops sliding upwards.
After the strength grade of the concrete reaches the standard, an operator uses the temporary hanging frame as an operation platform, 1 person respectively at the upper node and the lower node, uses a tower crane arranged at the center of the tower body as vertical transportation equipment, uses 2T chain rewinding for assistance, welds 1 steel support 5 between each pair of embedded parts, and welds 32 steel support nodes in sequence.
3. And constructing a lower floor slab construction formwork support frame of the cantilever structure layer.
After the steel brackets are stably installed, four rings of top ring beams (GL 2) 6 are installed between 32 steel brackets.
And wood beams are fully paved on the steel support 5 and the top ring beam 6 to form a temporary steel platform together, and the template support frame for the lower floor slab construction of the cantilever structure layer is built on the temporary steel platform.
4. And (5) constructing the lower floor slab of the cantilever structure layer, and removing the temporary hanging rack simultaneously.
Binding the lower floor slab reinforcing steel bars of the cantilever structure layer, and pouring lower floor slab concrete.
Before the lower floor concrete pouring process, a plurality of PVC pipes 8 are embedded in an annular distributed manner at a position 2000mm away from the outer wall of the tower body main body 2 of the lower floor 7 at a medium interval, and a through hole penetrating through the lower floor 7 is formed.
In order to facilitate the construction of the template, the temporary hanging frame is dismantled before the template is erected.
5. And (5) slip-form construction of a tower body main body between overhanging structural layers.
And after the concrete of the lower floor slab is finally set, continuing to perform 3.6 m-high tower body main body slip-form construction above the lower floor slab of the cantilever structure layer, and suspending the construction until the lower opening of the upper floor slab of the cantilever structure layer.
6. And constructing the upper floor of the cantilever structure layer.
And (3) erecting a template support for construction of the upper floor slab with an overhanging structure layer on the basis of the lower floor slab, then binding upper floor slab reinforcing steel bars, and pouring upper floor slab concrete.
And when the concrete strength of the overhanging structure layer reaches 100% of the design strength, the demolished template support frame for the lower floor slab construction and the demolished temporary steel platform are used.
When the temporary steel platform is dismantled, a lifting rope penetrates through a PVC pipe hole pre-buried in a lower floor slab and a steel wire rope for dismantling the temporary platform, and the lower end of the lifting rope is connected with a hanging basket for an operator to take and place a small tool when the temporary steel platform is dismantled.
7. And (4) slip form construction is carried out on the tower body main body above the cantilever structure layer, and the temporary hanging frame is hung again.
After the concrete strength of the upper floor slab of the overhanging structural layer is finally set, carrying out slip-form construction on the tower body main body above the overhanging structural layer, and after the height of the hanging frame is reached, hanging a temporary hanging frame on a sliding system on the periphery of the tower body main body through hanging pieces to serve as an operation platform for slip-form construction of the tower body main body and a steel support operation platform at the overhanging structure position of 73m until the total height of 101.50 m is completed.
8. The tower body main body slides in the air.
Before each idle sliding of the tower body main body sliding system, reinforcing steel bars 10 with the diameter larger than 25mm are adopted to form annular connection among the supporting rods 9 of each group of sliding system 1 through welding, and reinforcing steel bar scissor supports 11 are welded among the adjacent supporting rods 9 to increase the stability of the supporting rods 9. And after each idle sliding is finished, the annular connection formed by the steel bar scissor supports 11 and the steel bars 10 is removed.

Claims (4)

1. The synchronous construction method of the cantilever structure and the tower body main body of the lookout tower comprises tower body main body slip-form construction below a cantilever structure layer, tower body main body slip-form construction between cantilever structure layers, tower body main body slip-form construction above the cantilever structure layer and cantilever structure layer construction; the construction of the cantilever structure layer comprises the construction of a lower floor slab of the cantilever structure layer and the construction of an upper floor slab of the cantilever structure layer; the method is characterized in that: after the tower body main body below the cantilever structure layer is constructed to the lower opening of the lower floor slab of the cantilever structure layer in a sliding mode, a template of the tower body main body is made to slide to the upper opening of the lower floor slab of the suspension structure layer in an empty mode, then a temporary steel platform is set up, a template supporting frame for the lower floor slab construction of the cantilever structure layer is set up on the temporary steel platform, after the lower floor slab of the cantilever structure layer is formed, the tower body main body sliding construction between the cantilever structure layers is carried out, the tower body main body sliding construction is stopped when the tower body main body sliding construction between the cantilever structure layers is carried out to the lower opening of the upper floor slab of the cantilever structure layer, the template supporting frame for the upper floor slab construction of the cantilever structure layer is set up on the lower floor slab of the cantilever structure layer, and after the upper floor slab of the cantilever structure layer is formed, the tower body main body sliding construction above the cantilever structure layer is carried out in a sliding mode, Dismantling the temporary steel platform; when the slip form construction of the tower body main body below the cantilever structure layer is carried out, upper and lower layers of embedded parts are placed in an annular direction at equal intervals, after the concrete strength of the tower body main body below the cantilever structure layer reaches the standard, a steel support is welded between the upper and lower layers of embedded parts, a top ring beam is arranged on the steel support, and a temporary steel platform is formed after the steel support and the top ring beam are fully paved with battens; when the sliding formwork of the tower body main body slides to the elevation of the embedded parts at the upper layer, the embedded parts at the upper layer and the lower layer need to be completely discharged out of the formwork, and the sliding formwork construction is stopped; through connecting interim stores pylon on body of the tower main part slipform system, operating personnel uses interim stores pylon to carry out the welding of steel support as operation platform.
2. The synchronous construction method of the cantilever structure and the tower body main body of the observation tower as claimed in claim 1, wherein when the steel support is welded, a tower crane is used as vertical transportation equipment, and a slip form system radiation beam is used as a hanging point to perform auxiliary installation by using a 2T inverted chain.
3. The method for synchronously constructing the cantilever structure and the tower body of the observation tower as claimed in claim 1, wherein the PVC pipe is embedded in the lower floor slab of the cantilever structure layer to form a through hole penetrating through the lower floor slab.
4. The method for synchronously constructing the cantilever structure and the tower body of the observation tower as claimed in claim 3, wherein a hanging basket lifting rope is inserted into the embedded PVC pipe and a steel wire rope for removing the temporary platform is arranged, and the lower end of the lifting rope is connected with the hanging basket for an operator to take and place a small tool when the temporary platform is removed.
CN202010688992.7A 2020-07-16 2020-07-16 Synchronous construction method for cantilever structure and tower body main body of lookout tower Active CN111749456B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102116051A (en) * 2009-12-30 2011-07-06 上海市机械施工有限公司 Layer-by-layer overhanging structure lifting method
CN103485574A (en) * 2013-10-08 2014-01-01 贵州开磷建设有限责任公司 Method for constructing reinforced concrete structure of tower top of prilling tower
CN106088582A (en) * 2016-07-08 2016-11-09 广州市第四建筑工程有限公司 Slip form platform and be applied to armored concrete cylinder slding form operation method
CN108331336A (en) * 2018-03-12 2018-07-27 上海建工建集团有限公司 The integrated lifting steel plateform system and its construction method of floor synchronous construction
CN209293474U (en) * 2018-11-27 2019-08-23 云南省建设投资控股集团有限公司 A kind of support device that cantilevered structure falsework is shared with external scaffolding
CN110230397A (en) * 2019-06-17 2019-09-13 陕西建工第三建设集团有限公司 A kind of construction method of building space dislocation overhanging balcony

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102116051A (en) * 2009-12-30 2011-07-06 上海市机械施工有限公司 Layer-by-layer overhanging structure lifting method
CN103485574A (en) * 2013-10-08 2014-01-01 贵州开磷建设有限责任公司 Method for constructing reinforced concrete structure of tower top of prilling tower
CN106088582A (en) * 2016-07-08 2016-11-09 广州市第四建筑工程有限公司 Slip form platform and be applied to armored concrete cylinder slding form operation method
CN108331336A (en) * 2018-03-12 2018-07-27 上海建工建集团有限公司 The integrated lifting steel plateform system and its construction method of floor synchronous construction
CN209293474U (en) * 2018-11-27 2019-08-23 云南省建设投资控股集团有限公司 A kind of support device that cantilevered structure falsework is shared with external scaffolding
CN110230397A (en) * 2019-06-17 2019-09-13 陕西建工第三建设集团有限公司 A kind of construction method of building space dislocation overhanging balcony

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