CN210049579U

CN210049579U - Formwork system of concrete thin-shell dome structure

Info

Publication number: CN210049579U
Application number: CN201920451069.4U
Authority: CN
Inventors: 马翔; 章谊; 陆俊晖; 徐耀宗; 沙志雄; 赵英吉
Original assignee: Shanghai Construction No 2 Group Co Ltd
Current assignee: Shanghai Construction No 2 Group Co Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2020-02-11
Anticipated expiration: 2029-04-04

Abstract

The utility model discloses a die carrier system of concrete shell dome structure relates to shell dome structure and pours technical field. The method aims at the problem that the construction cost and the construction period cannot be simultaneously considered in the existing thin-shell dome structure pouring technology. It includes: the scaffold is erected at the bottom of the thin-shell dome structure to be poured; and the internal mold is arranged close to the top of the scaffold and is formed by assembling a plurality of circular arc section wood templates surrounding the axis of the thin-shell dome structure to be poured.

Description

Formwork system of concrete thin-shell dome structure

Technical Field

The utility model relates to a technical field is pour to concrete shell dome structure, in particular to concrete shell dome structure's die carrier system.

Background

The existing construction of the thin-shell dome structure mainly adopts a cast-in-place method, and comprises the following two forms:

1. the air film formwork is cast by adopting sprayed concrete, and the concrete construction process flow is as follows: the ball mould is inflated → the structural reinforcement is bound → the concrete is sprayed → the top of the ball mould is provided with a hole, the advantages of good structural stress performance, beautiful appearance, short construction period and the like are achieved, and the defects of high construction cost and requirement of professional equipment are overcome.

2. The steel pipe fastener type bent frame and the bilateral formwork are cast in a concrete layering mode, and the concrete construction process flow is as follows: the method comprises the steps of erecting a steel pipe fastener type bent frame → erecting an inner side formwork → erecting a first layer outer side formwork → concrete pouring → erecting a second layer outer side formwork → concrete pouring → erecting an N layer outer side formwork → concrete pouring, and has the advantages of low construction cost, complex construction procedures, long construction period and more construction joints.

In summary, the above common forms of the existing thin-shell dome structure pouring technology cannot give consideration to both the construction cost and the construction period, and it is urgently needed to optimize the implementation technology.

Disclosure of Invention

There is the problem that construction cost and construction cycle can't be taken into account simultaneously to current thin shell dome structure pouring technique, the utility model aims at providing a formwork system of thin shell dome structure of concrete, the unilateral centre form is built simply swiftly, need not to introduce professional equipment, has improved the efficiency of construction, has shortened construction period, has reduced construction cost to engineering quality has been improved.

The utility model provides a technical scheme that its technical problem adopted is: formwork system for concrete thin shell dome structures, comprising: the scaffold is erected at the bottom of the thin-shell dome structure to be poured; and the internal mold is arranged close to the top of the scaffold and is formed by assembling a plurality of circular arc section wood templates surrounding the axis of the thin-shell dome structure to be poured.

Preferably, the outer side of the inner die is bound with the upper steel bars and the lower steel bars, split heads are arranged between the upper steel bars and the lower steel bars, and the split heads are bound with the upper steel bars and the lower steel bars on two sides of the split heads through steel wires.

Preferably, it further comprises: and the steel wire mesh is arranged at the bottom of the dome with the thin shell to be poured and is connected with the epithelial steel bars.

Preferably, the scaffold is a steel pipe fastener type scaffold, and continuous longitudinal and transverse cross braces are arranged in the steel pipe fastener type scaffold.

Preferably, the scaffold further comprises: the plurality of horizontal reinforcing rods are arranged at the edge of the scaffold and connected with at least two adjacent vertical rods.

The utility model has the effects that: the utility model discloses a formwork system of concrete shell dome structure adopts the scaffold to combine the structural style of unilateral centre form to realize the integral pouring of curved surface shell dome structure, and the unilateral centre form is assembled by a plurality of circular arc section wooden templates surrounding the thin shell dome structure axis of waiting to pour, and the unilateral centre form is built simply swiftly, need not to introduce professional equipment, has improved the efficiency of construction, has shortened construction period, compares gas mould and two side formwork, and the unilateral centre form has obviously reduced construction cost; more importantly, the construction joints of the thin-shell dome structure are reduced by matching the single-side internal mold with concrete for integral pouring, and the engineering quality is improved, so that the organic combination of technology and economy is realized, and the high quality and the low cost are highly unified. The utility model discloses a die carrier system is particularly useful for the integral casting construction of the less thin shell dome structure of radian.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the formwork system of the concrete thin-shell dome structure of the present invention;

fig. 2 is a partially enlarged view of a portion a of fig. 1.

The numbers in the figures are as follows:

a scaffold 10; an inner mold 11; a steel wire mesh sheet 12; a horizontal reinforcing bar 14; a scissor brace 15; an upper steel bar 21; and lower skin rebar 22.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention. For convenience of description, the directions of "up" and "down" in the following description are the same as the directions of "up" and "down" in the drawings, but this should not be construed as limiting the technical solution of the present invention.

The formwork system of the concrete thin shell dome structure of the present invention is described with reference to fig. 1 and 2, which includes:

the scaffold 10 is erected at the bottom of the thin-shell dome structure to be poured;

and the inner mold 11 is tightly attached to the top of the scaffold 10 and is formed by assembling a plurality of circular arc section wood templates surrounding the axis of the thin-shell dome structure to be poured.

The utility model discloses a formwork system of concrete shell dome structure adopts scaffold frame 10 to combine the structural style of unilateral centre form 11 to realize the integral casting of curved surface shell dome structure, unilateral centre form 11 is assembled by a plurality of circular arc section wooden templates surrounding the thin shell dome structure axis to be cast, unilateral centre form 11 builds simply swiftly, need not to introduce professional equipment, has improved the efficiency of construction, has shortened construction period, compares gas mould and two side formwork, unilateral centre form 11 has obviously reduced construction cost; more importantly, the construction joints of the thin-shell dome structure are reduced by matching the single-side inner die 11 with concrete for integral pouring, and the engineering quality is improved, so that the organic combination of technology and economy is realized, and the high quality and the low cost are highly unified. The utility model discloses a die carrier system is particularly useful for the integral casting construction of the less thin shell dome structure of radian.

With reference to fig. 1 and 2, after the inner mold 11 is erected, the upper steel bars 21 and the lower steel bars 22 are bound on the outer side of the inner mold 11, split heads (not shown in the figure) are arranged between the upper steel bars 21 and the lower steel bars 22, the split heads are firmly connected with the upper steel bars 22 and the lower steel bars 22 on the two sides of the split heads in a steel wire binding manner, the distance between the split heads is preferably 50cm X50cm, and the distance between the upper steel bars 22 and the lower steel bars 22 and the thickness of the protective layer are controlled by arranging the split heads.

Preferably, the formwork system of the concrete thin-shell dome structure further comprises a steel wire mesh sheet 12 arranged at the bottom of the thin-shell dome to be poured, and the steel wire mesh sheet 12 is connected with an upper steel bar 21 of the thin-shell dome structure to be poured. The traditional mode of bilateral formwork support and opposite-pulling screw rods is not adopted in the area close to the bottom of the thin-shell dome with large radian, but the steel wire mesh sheets 12 are arranged below the upper-skin reinforcing steel bars 21, so that the concrete slump is strictly controlled, the bottom concrete is prevented from caving due to too large gradient, the formwork structure is simplified, and the pouring quality is guaranteed. The height of the steel wire mesh 12 is determined according to construction requirements, and the steel wire mesh 12 with the height of about 2 meters is arranged at the bottom of the thin-shell dome according to the radian of the thin-shell dome.

The scaffold 10 is a steel pipe fastener type scaffold 10, the installation is simple, the dismounting and the mounting are convenient, the size of the steel pipe in the embodiment is preferably D48 multiplied by 3.0, the longitudinal cross braces 15 are arranged every 5-6m of the scaffold 10, and the transverse cross braces 15 are arranged every three steps, so that the structural strength of the scaffold 10 is improved.

The formwork system of the concrete thin-shell dome structure further comprises: a plurality of horizontal reinforcing rods 14 are arranged at the edge of the scaffold 10, the horizontal reinforcing rods 14 are connected with at least two adjacent vertical rods so as to ensure the radian of the whole inner die 11, and the horizontal reinforcing rods 14 arranged at the edge of the scaffold 10 in an encrypted manner are connected with 4 adjacent vertical rods in the embodiment.

The construction process of the concrete thin-shell dome structure of the present invention is described below with reference to fig. 1 and 2, and the concrete steps are as follows:

s1: performing field lofting according to a design drawing of the thin-shell dome structure, splitting the whole inner mold 11 into a plurality of arc sections by taking the top of the thin-shell dome structure as a center, and manufacturing an arc section wood template according to the size of the arc sections, wherein a multilayer board with the thickness of 18mm is preferably used for manufacturing the arc section wood template in the embodiment; treating the foundation, positioning and paying off, and setting up a scaffold 10;

s2: in the installation stage of the inner mold 11, the circular arc section wooden mold plates are sequentially and symmetrically installed along the axis of the thin-shell dome structure to be poured, the whole inner mold 11 is assembled, the whole inner mold is checked and corrected, the radian and the flatness of the whole inner mold 11 and the splicing firmness are ensured, and the upper skin steel bars 21 and the lower skin steel bars 22 are bound on the outer side of the inner mold 11;

s3: the concrete is tested at the mixing plant, the most appropriate mixing ratio is determined, after the concrete arrives at the field, construction managers detect the slump of the concrete, the slump of the concrete is ensured not to be too large, the concrete is not densely poured, the pouring and tamping sequence of the concrete needs to be noticed in the concrete pouring process, the concrete is uniformly poured from the bottom to the top of the thin-shell dome structure in a matched mode, the pumping speed of the concrete needs to be controlled in the pouring process, the concrete is not suitable to be too fast, and after the concrete reaches the strength required by design, the scaffold 10 and the inner mold 11 are dismantled.

In conclusion, firstly, a circular arc section wood formwork is manufactured, positioning and paying-off are carried out, a scaffold 10 is erected, the whole inner mold 11 is assembled along the axis of the thin-shell dome structure to be poured, inner-side double-layer steel bars are bound, concrete with small slump is adopted for integral pouring, layered pouring is not needed, the construction process of the thin-shell dome structure is greatly simplified, the construction efficiency is improved, the construction period is shortened, and the construction cost is reduced; and the unilateral internal mold 11 is matched with concrete for integral casting, so that construction joints of the thin-shell dome structure are reduced, the controllability of construction quality is higher, the construction cost and the construction period are both considered, and high unification of high quality and low cost is realized.

In step S1, after the uprights of the scaffold 10 are erected, the measuring instrument is used to recheck the elevation of each upright, and the upright with an error elevation is corrected, so as to ensure the stability of the whole scaffold 10.

In step S1, during the laying process of the lower skin steel bars 22, a plurality of vertical steel bars are laid along the inner mold 11, and then the horizontal steel bars are laid on the vertical steel bars, the vertical steel bars and the horizontal steel bars are connected by binding steel wires, so that the horizontal steel bars and the vertical steel bars can be firmly fixed, the casting thickness of concrete can be effectively controlled when the concrete is cast, and the construction quality is ensured.

In the step S2, the steel wire mesh 12 is arranged in the area with the large radian at the bottom of the thin-shell dome to be poured, the steel wire mesh 12 is connected with the epithelial steel bars 21 of the thin-shell dome structure to be poured, the concrete slump is strictly controlled, the bottom concrete is prevented from caving due to too large gradient, the formwork structure is simplified, and the pouring quality is guaranteed.

In step S3, since the steel mesh 12 is disposed at the bottom of the thin-shell dome, the concrete pumping point needs to be disposed above the steel mesh 12, the steel mesh 12 in this embodiment has a height of 2 meters, and the concrete pumping point is disposed at a position 3 meters away from the bottom of the thin-shell dome, and then the concrete is uniformly poured from bottom to top from the bottom of the thin-shell dome in cooperation with manual work.

In step S3, since the thin-shell dome has a small cross-section, dense steel bars and a large concrete cohesiveness, in order to ensure sufficient and dense concrete, a micro vibrating rod is used to assist point vibration during casting, thereby avoiding quality defects caused by uneven flow of concrete.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, so that any changes and modifications made by those skilled in the art according to the above disclosure are all within the scope of the appended claims.

Claims

1. Formwork system of concrete shell dome structure, characterized in that includes:

the scaffold is erected at the bottom of the thin-shell dome structure to be poured;

and the internal mold is arranged close to the top of the scaffold and is formed by assembling a plurality of circular arc section wood templates surrounding the axis of the thin-shell dome structure to be poured.

2. The formwork system of claim 1, wherein: and the outer side of the inner die is bound with the upper steel bars and the lower steel bars, split heads are arranged between the upper steel bars and the lower steel bars, and the split heads are bound with the upper steel bars and the lower steel bars which are positioned at the two sides of the split heads through steel wires.

3. The formwork system of claim 2, further comprising: and the steel wire mesh is arranged at the bottom of the dome with the thin shell to be poured and is connected with the epithelial steel bars.

4. The formwork system of claim 1, wherein: the scaffold is a steel tube fastener type scaffold, and continuous longitudinal cross braces and transverse cross braces are arranged in the steel tube fastener type scaffold.

5. Formwork system according to claim 4, wherein the scaffold further comprises: the plurality of horizontal reinforcing rods are arranged at the edge of the scaffold and connected with at least two adjacent vertical rods.