CN101886466A - Construction method of tamping type coke oven coal tower formwork support structure - Google Patents

Abstract

A construction method for a tamping-type coke oven coal tower formwork support structure, which is carried out in accordance with the following steps: ① treatment of the foundation of the steel structure support platform; ② manufacture and installation of the steel structure support platform; ③ preloading of the steel structure support platform: Coke oven resistance walls and basement prefabricated slabs are used as pressing materials, and overload preloading is carried out according to 110% of the design load. The preloading time is 7 days, and observation points are set up, and observations are made once a day; Removal of structural support platforms. This construction method has achieved good results through careful design and effective monitoring of the large-span, high-support, and heavy-load formwork support system, especially creating a domestic precedent for 34.045-meter-span coal tower beams without cracks; solved the problem of large-span, high-support 1. Difficulties in heavy-load structure construction; adapt to the development direction of coking engineering towards large-scale coke ovens, short construction period, low turnover materials, safe and reliable, convenient for quality control, and high concrete structure strength.

Description

Construction method of tamping type coke oven coal tower formwork support structure

technical field

The invention relates to a formwork construction method used in the construction process of a large-scale coking project, in particular to a construction method for a large-span, high-support and heavy-load tamping-type coke oven coal tower formwork support structure.

Background technique

The tamping type coke oven coal tower has a large span, high support, and heavy-duty formwork support system with complex space stress, large erection height (15.49m and 26.3m canopy), large span (34.045m), and large load (structural weight 1600T) , and there are uneven forces in the construction process. At present, fastener-type steel pipe scaffolding is generally used as the formwork support system in China, which has the following disadvantages:

1. The research on fastener-type steel pipe scaffolding as a three-dimensional space structure is still insufficient, and the time and cost of similar calculations are extremely high, and many companies do not have such conditions;

2. The rigidity of the formwork support system is poor, and cracks are prone to occur under the beam, which seriously affects the structural strength and durability of the concrete;

3. The integrity and stability are poor, and there are potential safety hazards in supporting the 1600T self-weight of the coal tower, which endangers life safety;

4. The distance between the steel pipes is dense, requiring a large number of steel pipes, resulting in heavy workload, long construction period and high construction cost.

Contents of the invention

The invention aims at many deficiencies in the existing construction technology, and provides a construction method of a tamping type coke oven coal tower with a large span, high branch and heavy load formwork with short construction period, safety and reliability, and low production cost.

The technical solution adopted to achieve the above purpose is: a construction method for the formwork support structure of the tamping type coke oven coal tower. The support structure of the formwork includes a steel structure support platform for supporting the formwork as a whole, and also includes The support frame, the construction method is carried out according to the following steps:

① Treatment of steel structure support platform foundation:

a. Substrate treatment: The backfill soil used as the substrate shall be compacted layer by layer, the thickness of each layer shall be ≤250mm, and the compaction coefficient shall be ≥0.96;

b. Embedded parts treatment: After the base treatment, pour reinforced concrete with a thickness of 250mm, deepen the treatment at the foot of the steel column, measure and lay out the line according to the position of the steel column in the design plan of the steel structure support platform, and install it in advance Make a pre-embedded anchor plate;

c. Health treatment: curing time ≥ 7 days, when the strength of the reinforced concrete on the base reaches 75% of the design strength, install a steel structure support platform;

② Fabrication and installation of steel structure support platform:

a. According to the construction drawing of the steel structure formwork support system, set out and number the materials, and check the size and direction between the drawings one by one. The blanking of H-shaped steel and I-shaped steel is sawing;

b. The steel column is hoisted vertically by a single machine, the steel beam is hoisted horizontally by two-point lashing, and the steel column is fixed on the pre-buried anchor plate;

c. Within the scope of the crane's lifting capacity, assemble the steel column and steel beam on the ground to form a hoisting unit, and hoist it in place at one time;

d. The welding between the steel column and the steel beam is firm;

③ Preloading of the steel structure support platform: The preloading materials are coke oven resistance walls and prefabricated slabs in the basement, and the overload preloading is carried out according to 110% of the design load. The preloading time is 7 days, and observation points are set up, and observations are made once a day;

④Installation of each template and scaffold:

楼板模板和挑檐模板的支撑架：

slab formwork and Support frame for cornice formwork:

楼板模板和

挑檐模板的支撑架；脚手架搭设时，先在钢结构支撑平台次钢梁的翼缘中心焊接多个钢筋；a. The supporting frame of the two formworks adopts fastener-type steel pipe scaffolding, and the steel structure supporting platform starts to be erected after preloading

slab formwork and

The support frame of the eave formwork; when the scaffold is erected, a plurality of steel bars are welded in the center of the flange of the secondary steel beam of the steel structure support platform;

b. The support frame is erected according to the specification requirements of fastener type steel pipe scaffolding;

Support frame of reinforced concrete hyperbolic funnel formwork, hyperbolic funnel formwork includes hyperbolic formwork and funnel main beam formwork:

a. Reinforced concrete hyperbolic formwork, the main keel is fixed on the scaffold through fasteners and supporting steel pipes, and then the steel bars bent and pressed into hyperbolas are used as the secondary keel of the inner and outer funnel wall wood formwork, and fixed on the main keel according to the spacing of 150mm , according to the distance of 500mm, the main keel and the secondary keel are fixed with pull bolts;

楼板上，脚手架中的立杆排布为横向间距470mm，纵向间距500mm，步距1000mm，且立杆底端纵向设置槽钢，立杆顶端设置顶丝，顶丝上设置的工字钢作为主梁模板的主龙骨，次龙骨则是设置在主龙骨上方的木方，且相邻木方间距为200mm；b. The lower part of the main girder formwork of the funnel is supported by steel pipe scaffolding

On the floor, the vertical poles in the scaffolding are arranged with a horizontal spacing of 470mm, a vertical spacing of 500mm, and a step distance of 1000mm. The main keel of the beam formwork, the secondary keel is the wooden square set above the main keel, and the distance between adjacent wooden squares is 200mm;

Support frame for floor formwork:

楼板模板的支撑架，该支撑采用扣件式钢管脚手架，且按照扣件式钢管脚手架的规范要求搭设；When the concrete strength of the reinforced concrete hyperbolic funnel main beam formwork reaches 100% of the design strength, the support frame supporting the formwork and the funnel main beam bottom formwork can be dismantled and erected

The support frame of the floor formwork, the support adopts the fastener type steel pipe scaffolding, and is erected according to the specification requirements of the fastener type steel pipe scaffolding;

⑤Removal of scaffolding and steel structure support platform:

a. When the concrete strength of the reinforced concrete hyperbolic formwork and the funnel main beam formwork reaches 100% of the design strength, all scaffolding shall be removed, and the high-altitude and large-span concrete structure shall be inspected and accepted in time;

b. After the exterior decoration is accepted, the steel structure support platform shall be dismantled in an all-round way, in the order of dismantling those erected later and demolishing those erected first, and the dismantled materials shall be cleared and transported out of the site in time.

Compared with the existing technology, the construction method of this project has achieved good results through careful design and effective monitoring of the large-span, high-support, and heavy-duty formwork support system, especially creating a domestic 34.045-meter-span coal tower beam without cracks It is the first of its kind; it solves the construction problems of large-span, high-branch, and heavy-load structures; it adapts to the development direction of coking engineering towards large-scale and tinkering with coke ovens. The results are as follows:

1. Short construction period: the steel structure support platform can be processed and prefabricated outside the site, which does not occupy the dominant construction period and construction site, and can provide the conditions for three-dimensional cross operation;

2. Saving turnover materials: Using the steel structure support platform, the high formwork is converted into a common formwork support system, which saves a lot of investment in steel pipe scaffolding materials, and the section steel can be recycled and reused;

3. Safe and reliable: The steel structure support platform has clear force and reliable performance, but steel pipe scaffolding is difficult to put in place at one time, and there are potential safety hazards. Now, the high formwork for high-altitude operations is converted into operating conditions with reliable safety protection to improve the safety factor. ,Safe and reliable;

4. Facilitate quality control: construction of high-altitude and large-span concrete structures and exterior decoration works, equipment installation and other projects on steel platforms, the operating conditions are safe and convenient, easy to check and accept, and conducive to improving construction quality;

5. The concrete structure has high strength and good durability: the steel structure supporting platform has high rigidity and good integrity, and the beam will not deflect and cause cracks during construction, so the concrete structure has high strength and good durability.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the template support system of the present invention.

Fig. 2 is a plane layout diagram of the template support system of the present invention.

Fig. 3 is a sectional view taken along line A-A in Fig. 1 .

Fig. 4 is a sectional view taken along the line B-B in Fig. 1 .

Fig. 5 is a schematic diagram of the formwork support of the hyperbolic funnel.

FIG. 6 is a partially enlarged view of part C in FIG. 5 .

楼板4，双曲线模板5，漏斗主梁模板6，

楼板7，

楼板支撑架8，钢柱9，主钢梁10，次钢梁11，檩条12，角钢13，槽钢14，主梁模板支撑架15，槽钢16，顶丝17，工字钢18，木方19，漏斗主梁梁底木模板20，三字卡21，次龙骨22，对拉螺栓23，主龙骨24，漏斗壁木模板25。Among them: supporting platform 1, overhanging eaves support frame 2, overhanging eaves 3,

Floor 4, hyperbolic formwork 5, funnel girder formwork 6,

Floor 7,

Floor support frame 8, steel column 9, main steel beam 10, secondary steel beam 11, purlin 12, angle steel 13, channel steel 14, main beam formwork support frame 15, channel steel 16, top wire 17, I-beam 18, wood Square 19, funnel main beam bottom wooden formwork 20, three-character card 21, secondary keel 22, pull bolt 23, main keel 24, funnel wall wooden formwork 25.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

楼板模板7、

挑檐模板3、双曲线漏斗模板中的双曲线模板5、漏斗主梁模板6的模板支撑架。Referring to accompanying drawings 1-6, in this embodiment, the construction method of the large-span, high-branch, heavy-duty formwork support structure of the tamping type coke oven coal tower, the support structure of this formwork includes the steel structure used to support the formwork as a whole The supporting platform 1 also includes supporting frames for supporting each template, and these supporting frames include supporting frames for supporting Floor template 4,

Floor template 7,

Overhanging eave formwork 3, hyperbolic formwork 5 in the hyperbolic funnel formwork, formwork support frame of funnel main beam formwork 6.

Among them: the steel column 9 of the steel structure support platform 1 is made of H-shaped steel H250×250×14×14, which is welded with the anchor plate. The support between the steel columns 9 adopts L75×6 angle steel 13, and the gusset plate δ8. The steel beams of the steel structure support platform 1 include main steel beams 10, secondary steel beams 11, and purlins 12. The main steel beams 10 adopt I-beam I 32a, and are arranged horizontally; I-beam I10a@500 is used for horizontal arrangement. The arching height of the steel structure support platform 1 is 1/1000 of the span. There are a large number of pre-embedded bolts at the funnel mouth of the coal tower, and the fixed bolts are made of δ4 steel plates laid on the bottom of the beam.

Described construction method carries out according to the following steps:

① Treatment of the foundation of the steel structure support platform 1:

a. Substrate treatment: The backfill soil used as the substrate shall be compacted in layers, the thickness of the layers shall be ≤250mm, and the compaction coefficient shall be ≥0.96;

b. Treatment of pre-embedded parts: After the base treatment, pour C25 reinforced concrete with a thickness of 250mm on the base, and deepen the treatment at the foot of the steel column. The general deepening treatment is to make a foundation with a depth of 500mm, a length of 1000mm, and a width of 800mm According to the plane position of the steel column in the design plan of the steel structure support platform, the position of the embedded parts is measured. During installation, the level of the embedded parts is controlled by a level gauge, and the pre-made embedded anchor plate is installed in the foundation pit. The size of the anchor plate It is 600×800×16(mm), the anchor plate is plug-welded with anchor claws, and the anchor claws at the bottom of each anchor plate are 12 rebars with a diameter of 22mm and a length of 450mm;

c. Health treatment: curing time ≥ 7 days, when the strength of the reinforced concrete on the base reaches 75% of the design strength, install the steel structure support platform 1 .

② Manufacture and installation of steel structure support platform 1:

a. According to the construction drawing of the steel structure formwork support system, set out and number the materials, and check the size and direction between the drawings one by one. The blanking of the I-beam is cut by sawing to prevent deformation;

b. The steel column 9 is hoisted vertically by a single machine, and it can be turned and straightened. During the lifting and turning process, collision with other installed structures should be avoided. The effective height of the sling should be reserved, and the climbing ladder should be hung before the steel column 9 is straightened. At the predetermined position of the steel column and fasten it firmly, temporarily fix it after hoisting in place, correct the verticality, install the steel column in place, align the axis, and fix it firmly before releasing the sling; the steel beam is hoisted horizontally by two-point tying During installation, it is necessary to ensure that the steel beams remain horizontal. When hanging multiple steel beams, they are bound firmly and installed one by one. During installation, the steel columns are all fixed on the pre-buried anchor plates to ensure the stability of the steel column support; The support between the columns adopts channel steel 14, and the support between the steel columns adopts L75×6 angle steel 13 to ensure stability;

c. Within the scope of the lifting capacity of the crane, assemble the steel column and steel beam on the ground to form a hoisting unit, such as steel column and steel support, steel beam assembly, etc., and hoist it in place at one time;

d. The welding between the steel column and each steel beam is firm. The two ends of the main weld at the joint must be equipped with an arc strike plate and a lead plate. The material should be the same as the base metal to be welded, and the groove form should be the same as the weld to be welded , It is forbidden to use materials of other materials as the arc strike plate and lead-out plate.

③ Preloading of steel structure support platform 1: The preloading materials are coke oven resistance walls and basement prefabricated slabs, and overload preloading is carried out according to 110% of the design load. The preloading time is 7 days, and observation points are set up to observe once a day.

④Installation of each template support frame:

楼板模板4和

挑檐模板3的支撑架：

Slab Formwork 4 and

The supporting frame of the cornice formwork 3:

楼板模板支撑架8及

挑檐支撑架2。脚手架搭设时，在钢结构平台1的次钢梁11的翼缘中心线上，按照搭设支撑架中的立杆间距焊接φ25钢筋，长100mm，它的作用是防止立杆滑移，避免工字钢偏心受力；a. The supporting frame of the two formworks adopts fastener-type steel pipe scaffolding, and the steel structure supporting platform 1 starts to be erected after preloading

Floor formwork support frame 8 and

Overhanging eaves support frame 2. When scaffolding is erected, on the center line of the flange of the secondary steel beam 11 of the steel structure platform 1, φ25 steel bars are welded according to the vertical rod spacing in the erected support frame, with a length of 100mm. Its function is to prevent vertical rods from slipping and avoid I-shaped Steel eccentric force;

b. The support frame shall be erected in accordance with the specification requirements of fastener-type steel pipe scaffolding;

The support frame of the reinforced concrete hyperbolic funnel formwork, the hyperbolic funnel formwork includes hyperbolic formwork 5 and funnel main beam formwork 6:

a. The main keel 24 of reinforced concrete hyperbolic formwork 5 adopts steel pipe Φ48×3.5, and the main keel 24 is fixed on the main beam formwork support frame 15 through fasteners and supporting steel pipes, with a distance of 500mm; As the secondary keel 22 of the inner and outer funnel wall formwork 25, the steel bars are bound on the main keel 24 with threaded steel Φ22 at a distance of 150mm; made of round steel;

楼板上，该支撑架15中钢管的规格为Φ48×3.5，脚手管中的立杆排布为横向间距470mm，纵向间距500mm，步距1000mm，且立杆底端纵向设置槽钢16，用于扩散压力；立杆顶端设置顶丝17，顶丝17上设置的10号的工字钢18作为主梁模板的主龙骨，次龙骨则是设置在主龙骨上方的木方19，该木方19的规格为50×100mm，且相邻木方19的间距为200mm；立杆即为竖直设置的钢管，各立杆之间不得搭接，必须按照图纸的尺寸计算并切割精准的尺寸，以保证脚手架的稳定性。b. The lower part of the main girder formwork 6 of the funnel is supported by steel pipe scaffolding

On the floor, the specifications of the steel pipes in the support frame 15 are Φ48×3.5, the vertical poles in the scaffolding pipe are arranged with a horizontal spacing of 470 mm, a longitudinal spacing of 500 mm, and a step distance of 1000 mm, and channel steel 16 is arranged longitudinally at the bottom of the vertical poles. Due to the diffusion pressure; the top of the pole is provided with a top wire 17, and the No. 10 I-beam 18 set on the top wire 17 is used as the main keel of the main beam formwork, and the secondary keel is the wooden square 19 arranged on the top of the main keel. The specification of 19 is 50×100mm, and the distance between adjacent wooden squares 19 is 200mm; the vertical poles are steel pipes installed vertically, and the vertical poles must not be overlapped, and must be calculated according to the size of the drawing and cut to an accurate size. To ensure the stability of the scaffolding.

The support frame of the slab 7 formwork:

楼板模板7的支撑架，该支撑架采用扣件式钢管脚手架，它按照扣件式钢管脚手架规范要求搭设。When the concrete strength of the reinforced concrete hyperbolic funnel main beam formwork 6 reaches 100% of the design strength, the support frame supporting the formwork and the funnel main beam bottom formwork 20 can be dismantled, and the construction begins

The support frame of the floor template 7, the support frame adopts a fastener type steel pipe scaffold, which is erected according to the specification requirements of the fastener type steel pipe scaffold.

⑤Removal of support frame and steel structure support platform:

a. When the concrete strength of the reinforced concrete hyperbolic formwork and the funnel main beam formwork reaches 100% of the design strength, remove all the supporting frames, and timely inspect and accept the high-altitude and large-span concrete structure;

b. After the exterior decoration is accepted, the steel structure support platform shall be dismantled in an all-round way, in the order of dismantling those erected later and demolishing those erected first, and the dismantled materials shall be cleared and transported out of the site in time.

On the steel structure support platform, dense safety nets and scaffolding boards should be set up for double safety protection, and special personnel should be responsible for cleaning up sundries on the platform in time to prevent safety accidents caused by high-altitude objects. The perimeter of the steel structure supporting platform should also be pre-set with safety protection railings.

Claims (1)

1. A construction method of a tamping-type coke oven coal tower formwork support structure, characterized in that the support structure of this formwork comprises a steel structure support platform for supporting formwork as a whole, and also includes a support frame for supporting each formwork , the construction method is carried out according to the following steps: ① Treatment of steel structure support platform foundation: a. Substrate treatment: The backfill soil used as the substrate shall be compacted layer by layer, the thickness of each layer shall be ≤250mm, and the compaction coefficient shall be ≥0.96; b. Embedded parts treatment: After the base treatment, pour reinforced concrete with a thickness of 250mm, deepen the treatment at the foot of the steel column, measure and lay out the line according to the position of the steel column in the design plan of the steel structure support platform, and install it in advance Make a pre-embedded anchor plate; c. Health treatment: curing time ≥ 7 days, when the strength of the reinforced concrete on the base reaches 75% of the design strength, install a steel structure support platform; ② Fabrication and installation of steel structure support platform: a. According to the construction drawing of the steel structure formwork support system, set out and number the materials, and check the size and direction between the drawings one by one. The blanking of H-shaped steel and I-shaped steel is sawing; b. The steel column is hoisted vertically by a single machine, the steel beam is hoisted horizontally by two-point lashing, and the steel column is fixed on the pre-buried anchor plate; c. Within the scope of the crane's lifting capacity, assemble the steel column and steel beam on the ground to form a hoisting unit, and hoist it in place at one time; d. The welding between the steel column and the steel beam is firm; ③ Preloading of the steel structure support platform: The preloading materials are coke oven resistance walls and prefabricated slabs in the basement, and the overload preloading is carried out according to 110% of the design load. The preloading time is 7 days, and observation points are set up, and observations are made once a day; ④Installation of each template and scaffold: slab formwork and

Support frame for cornice formwork: a. The supporting frame of the two formworks adopts fastener-type steel pipe scaffolding, and the steel structure supporting platform starts to be erected after preloading

slab formwork and The support frame of the eave formwork; when the scaffold is erected, a plurality of steel bars are welded in the center of the flange of the secondary steel beam of the steel structure support platform; b. The support frame is erected according to the specification requirements of fastener type steel pipe scaffolding; Support frame of reinforced concrete hyperbolic funnel formwork, hyperbolic funnel formwork includes hyperbolic formwork and funnel main beam formwork: a. Reinforced concrete hyperbolic formwork, the main keel is fixed on the scaffold through fasteners and supporting steel pipes, and then the steel bars bent and pressed into hyperbolas are used as the secondary keel of the inner and outer funnel wall wood formwork, and fixed on the main keel according to the spacing of 150mm , according to the distance of 500mm, the main keel and the secondary keel are fixed with pull bolts; b. The lower part of the main girder formwork of the funnel is supported by steel pipe scaffolding

On the floor, the vertical poles in the scaffolding are arranged with a horizontal spacing of 470mm, a vertical spacing of 500mm, and a step distance of 1000mm. The main keel of the beam formwork, the secondary keel is the wooden square set above the main keel, and the distance between adjacent wooden squares is 200mm;

Support frame for floor formwork: When the concrete strength of the reinforced concrete hyperbolic funnel main beam formwork reaches 100% of the design strength, the support frame supporting the formwork and the funnel main beam bottom formwork can be dismantled and erected

The support frame of the floor formwork, the support adopts the fastener type steel pipe scaffolding, and is erected according to the specification requirements of the fastener type steel pipe scaffolding; ⑤Removal of scaffolding and steel structure support platform: a. When the concrete strength of the reinforced concrete hyperbolic formwork and the funnel main beam formwork reaches 100% of the design strength, all scaffolding shall be removed, and the high-altitude and large-span concrete structure shall be inspected and accepted in time; b. After the exterior decoration is accepted, the steel structure support platform shall be dismantled in an all-round way, in the order of dismantling those erected later and demolishing those erected first, and the dismantled materials shall be cleared and transported out of the site in time.

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