阅读说明：本技术 大跨度网架整体顶升法及其限位与防倾翻装置 (Large-span net rack integral jacking method and limiting and anti-tipping device thereof ) 是由 董江 董翀 张冬 金昭 王建宇 王荣壮 李丽苹 刘培洪 陈永升 于 2019-09-30 设计创作，主要内容包括：本发明涉及大跨度网架施工技术领域,尤其涉及一种大跨度网架整体顶升法及其限位与防倾翻装置。包括措施支架、顶升支架、导轨、液压千金顶、限位防倾覆支架以及马镫；措施支架顶端与网架相连,措施支架底端固定在顶升支架上,多个顶升支架自上而下依次首尾相连,液压千金顶底部固定在混凝土基础上,液压千金顶顶部固定在措施支架底部,马镫放置在混凝土基础上,马镫位于顶升支架下方；导轨为竖向导轨,限位防倾覆支架一端与网架相连,限位防倾覆支架另一端抵在导轨上。限制网架整体提升过程中产生的位移,分担顶升支撑系统因受力不均而产生的水平荷载,大幅提高原有工艺的施工安全可靠度、较好控制了网架中心位移,提高施工质量。(The invention relates to the technical field of large-span net rack construction, in particular to a large-span net rack integral jacking method and a limiting and anti-tipping device thereof. The device comprises a measure support, a jacking support, a guide rail, a hydraulic climbing top, a limiting overturn-preventing support and stirrups; the top end of the measure support is connected with the net rack, the bottom end of the measure support is fixed on the jacking supports, the plurality of jacking supports are sequentially connected end to end from top to bottom, the bottom of the hydraulic pressure kilo-gold top is fixed on the concrete foundation, the top of the hydraulic pressure kilo-gold top is fixed on the bottom of the measure support, the stirrups are placed on the concrete foundation, and the stirrups are located below the jacking supports; the guide rail is vertical guide rail, and spacing support one end of preventing toppling links to each other with the rack, and spacing support other end of preventing toppling supports and supports on the guide rail. The displacement that the net rack whole lifting in-process produced is restricted, shares the horizontal load that jacking braced system produced because of the atress is uneven, improves the construction safe and reliable degree of original technology by a wide margin, better control net rack central displacement, improves construction quality.)

1. The utility model provides a whole jacking device of large-span rack which characterized in that: the device comprises a measure support, a jacking support, a guide rail, a hydraulic climbing top, a limiting overturn-preventing support and stirrups; the top end of the measure support is connected with the net rack, the bottom end of the measure support is fixed on the jacking supports, the plurality of jacking supports are sequentially connected end to end from top to bottom, the bottom of the hydraulic pressure kilo-gold top is fixed on the concrete foundation, the top of the hydraulic pressure kilo-gold top is fixed on the bottom of the measure support, the stirrups are placed on the concrete foundation, and the stirrups are located below the jacking supports; the guide rail is vertical guide rail, and spacing support one end of preventing toppling links to each other with the rack, and spacing support other end of preventing toppling supports and supports on the guide rail.

2. The integral jacking device for the large-span net rack according to claim 1, wherein: the measure bracket is an umbrella-shaped bracket.

3. The integral jacking device for the large-span net rack according to claim 1, wherein: flanges are arranged at the top and the bottom of each jacking support, and the plurality of jacking supports are connected through the flanges.

4. The integral jacking device for the large-span net rack according to claim 1, wherein: the guide rail is a rectangular upright post.

5. The integral jacking device for the large-span net rack according to claim 1, wherein: the limiting overturn-preventing support is a T-shaped support and comprises a steel pipe limiting clamp and a steel pipe supporting rod, and the steel pipe supporting rod is vertically and fixedly connected to the steel pipe limiting clamp.

6. The integral jacking device for the large-span net rack according to claim 1, wherein: the jacking device further comprises a middle bearing plate, and the middle bearing plate is transversely and fixedly connected between the two jacking supports.

7. The integral jacking device for the large-span net rack according to claim 1, wherein: the lifting device further comprises a steel wire rope, one end of the steel wire rope is fixed on the net rack, and the other end of the steel wire rope is fixed on the lifting support.

8. The integral jacking device for the large-span net rack according to claim 1, wherein: the limiting overturn-preventing support obliquely and downwards abuts against the guide rail, and the oblique downward angle is 20-30 degrees.

9. A method for integrally jacking a large-span net rack based on the device of claim 1, which comprises the following steps:

step one, jacking preparation:

reinforcing the column head of the steel column of the net rack through a steel pipe;

step two, installing a jacking device:

1) the guide rail is arranged:

the plant structure column is used as a vertical guide rail in the process of jacking the integral structure of the net rack, so that the integral net rack vertically moves and jacks along the plant structure column;

2) installing a limiting overturn-preventing bracket;

welding one end of the limiting overturn-preventing bracket on the net rack, and obliquely supporting the other end of the limiting overturn-preventing bracket on the side surface of the guide rail downwards, wherein the oblique downward angle is 20-30 degrees; horizontal force and displacement generated due to uneven stress of the jacking device are transmitted and limited through the inclined support rod pieces of the limiting overturn-preventing support in the integral jacking process of the net rack;

3) placing a stirrup on a concrete foundation, fixing the bottom of a hydraulic pressure thousand-gold top on the concrete foundation, fixedly connecting the top of the hydraulic pressure thousand-gold top to the bottom of a measure support, placing the bottom of a jacking support on the stirrup, fixedly connecting the top of the jacking support to the bottom of the measure support, and welding the top of the measure support on a net rack;

step three, pre-topping:

1) releasing all connections between the net rack and the ground;

2) when the jacking is started, the speed must be controlled, the net rack support is observed, and the normal jacking is started until the support is actually separated from the ground by more than 30 cm;

3) when the net rack support leaves 50mm of the ground, the net rack support should be suspended for 30 minutes, the net rack is checked, and the checking content comprises: whether the jacking support at the lower part is normal or not, whether the jacking support is seriously deviated or not, whether the net rack rod piece is bent or not, and whether the net rack support is basically equal to the ground or not;

4) starting trial jacking, wherein the jacking height in each trial jacking stage is not more than 500 mm;

5) in the top test stage, recording the pressure of an oil pump of the hydraulic thousand golden tops, calculating the support reaction force of each supporting point according to the data, and comparing the data with the designed support reaction force of the net rack; if the numerical values of the two are consistent, the net rack is proved to be correct in checking;

step four, jacking:

1) after the pre-jacking is finished, the hydraulic thousand-golden jack is jacked upwards step by step;

2) the hydraulic jack moves upwards, a next section of jacking support is erected at the lower part of the jack, and a section steel stirrup is used for flattening and firmly cushioning the bottom of the support;

3) the jack mandril is dropped to the bottom, the bearing plate arranged in the middle of the jacking bracket is added and firmly anchored by a rivet, the jack is back-adjusted to jack the bearing plate bottom plate, and the readjustment is synchronous;

4) the jack continues to move for a stroke, the jacking supports are sequentially added until the jacking height in the scheme is preset, and steel wire ropes are sequentially added at the pre-jacking positions on two sides of each jacking support in the jacking process;

step five, sealing the structural edge in place:

1) after the net rack is jacked to the designed height, the connection welding with the peripheral net rack is carried out; checking the stress state of the guy rope and the bracket; after the net rack meets the in-place condition, the temporary support bracket is matched, and the net rack is lowered to fall on the supporting column;

2) firstly, mounting, welding and fixing a support, and then mounting a steel pipe;

3) measuring the deflection and the geometric dimension of the net rack after the net rack is in place, and recording and evaluating;

4) after all the work is done, the height of the hydraulic jack support is adjusted to slowly fall back to the in-position height, the support stops falling back after the support and the net rack are uniformly stressed, the in-position height and the deviation are rechecked, the net rack in-position node is welded with the support after the design requirements are met, and the hydraulic jack support is finally unloaded after the welding is finished;

step six: dismantling the bracket:

and (4) after the net rack is in place, dismantling the jacking bracket.

Technical Field

The invention relates to the technical field of large-span net rack construction, in particular to a large-span net rack integral jacking method and a limiting and anti-tipping device thereof.

Background

The grid structure can be developed and widely applied rapidly in about thirty-four years, and is mainly characterized in that the grid structure is high in rigidity, good in integrity and strong in shock resistance; the self-weight is light, the steel is saved, the construction is convenient and fast, and the like. It is suitable for buildings with various span and plane shapes. In particular to large-span structures such as large shopping squares, airplane hangars, stadiums and the like.

The common methods for installing the net rack on site include six methods: the method comprises the following steps of an overhead bulk loading method, a strip and block mounting method, an overhead sliding method, an integral hoisting method, an integral lifting method and an integral jacking method.

The large-span net rack jacking technology reduces the use amount of turnover materials and avoids high-altitude operation because the net racks are assembled on the ground. The jacking equipment has high utilization rate and low construction cost. The construction period is short, and the installation quality construction of the net rack is controllable and has good quality compared with other construction methods. Have been widely used in recent years.

However, in the process of jacking the net rack, the jacking support system generates horizontal load due to uneven stress, and then the center of the net rack is displaced, so that the net rack topples, the construction safety and reliability are low, and the construction quality is difficult to guarantee.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a large-span net rack integral jacking method and a limiting and anti-tipping device thereof. The displacement that the net rack whole lifting in-process produced is restricted, shares the horizontal load that jacking braced system produced because of the atress is uneven, improves the construction safe and reliable degree of original technology by a wide margin, better control net rack central displacement, improves construction quality.

In order to achieve the purpose, the invention adopts the following technical scheme:

a large-span net rack integral jacking device comprises a measure support, a jacking support, a guide rail, a hydraulic climbing top, a limiting overturn-preventing support and stirrups; the top end of the measure support is connected with the net rack, the bottom end of the measure support is fixed on the jacking supports, the plurality of jacking supports are sequentially connected end to end from top to bottom, the bottom of the hydraulic pressure kilo-gold top is fixed on the concrete foundation, the top of the hydraulic pressure kilo-gold top is fixed on the bottom of the measure support, the stirrups are placed on the concrete foundation, and the stirrups are located below the jacking supports; the guide rail is vertical guide rail, and spacing support one end of preventing toppling links to each other with the rack, and spacing support other end of preventing toppling supports and supports on the guide rail.

The measure bracket is an umbrella-shaped bracket.

Flanges are arranged at the top and the bottom of each jacking support, and the plurality of jacking supports are connected through the flanges.

The guide rail is a rectangular upright post.

The limiting overturn-preventing support is a T-shaped support and comprises a steel pipe limiting clamp and a steel pipe supporting rod, and the steel pipe supporting rod is vertically and fixedly connected to the steel pipe limiting clamp.

The jacking device further comprises a middle bearing plate, and the middle bearing plate is transversely and fixedly connected between the two jacking supports.

The lifting device further comprises a steel wire rope, one end of the steel wire rope is fixed on the net rack, and the other end of the steel wire rope is fixed on the lifting support.

The limiting overturn-preventing support obliquely and downwards abuts against the guide rail, and the oblique downward angle is 20-30 degrees.

A large-span net rack integral jacking method comprises the following steps:

step one, jacking preparation:

reinforcing the column head of the steel column of the net rack through a steel pipe;

step two, installing a jacking device:

1) the guide rail is arranged:

the plant structure column is used as a vertical guide rail in the process of jacking the integral structure of the net rack, so that the integral net rack vertically moves and jacks along the plant structure column;

2) installing a limiting overturn-preventing bracket;

welding one end of the limiting overturn-preventing bracket on the net rack, and obliquely supporting the other end of the limiting overturn-preventing bracket on the side surface of the guide rail downwards, wherein the oblique downward angle is 20-30 degrees; horizontal force and displacement generated due to uneven stress of the jacking device are transmitted and limited through the inclined support rod pieces of the limiting overturn-preventing support in the integral jacking process of the net rack;

3) placing a stirrup on a concrete foundation, fixing the bottom of a hydraulic pressure thousand-gold top on the concrete foundation, fixedly connecting the top of the hydraulic pressure thousand-gold top to the bottom of a measure support, placing the bottom of a jacking support on the stirrup, fixedly connecting the top of the jacking support to the bottom of the measure support, and welding the top of the measure support on a net rack;

step three, pre-topping:

1) releasing all connections between the net rack and the ground;

2) when the jacking is started, the speed must be controlled, the net rack support is observed, and the normal jacking is started until the support is actually separated from the ground by more than 30 cm;

3) when the net rack support leaves 50mm of the ground, the net rack support should be suspended for 30 minutes, the net rack is checked, and the checking content comprises: whether the jacking support at the lower part is normal or not, whether the jacking support is seriously deviated or not, whether the net rack rod piece is bent or not, and whether the net rack support is basically equal to the ground or not;

4) starting trial jacking, wherein the jacking height in each trial jacking stage is not more than 500 mm;

5) in the top test stage, recording the pressure of an oil pump of the hydraulic thousand golden tops, calculating the support reaction force of each supporting point according to the data, and comparing the data with the designed support reaction force of the net rack; if the numerical values of the two are consistent, the net rack is proved to be correct in checking;

step four, jacking:

1) after the pre-jacking is finished, the hydraulic thousand-golden jack is jacked upwards step by step;

2) the hydraulic jack moves upwards, a next section of jacking support is erected at the lower part of the jack, and a section steel stirrup is used for flattening and firmly cushioning the bottom of the support;

3) the jack mandril is dropped to the bottom, the bearing plate arranged in the middle of the jacking bracket is added and firmly anchored by a rivet, the jack is back-adjusted to jack the bearing plate bottom plate, and the readjustment is synchronous;

4) the jack continues to move for a stroke, the jacking supports are sequentially added until the jacking height in the scheme is preset, and steel wire ropes are sequentially added at the pre-jacking positions on two sides of each jacking support in the jacking process;

step five, sealing the structural edge in place:

1) after the net rack is jacked to the designed height, the connection welding with the peripheral net rack is carried out; checking the stress state of the guy rope and the bracket; after the net rack meets the in-place condition, the temporary support bracket is matched, and the net rack is lowered to fall on the supporting column;

2) firstly, mounting, welding and fixing a support, and then mounting a steel pipe;

3) measuring the deflection and the geometric dimension of the net rack after the net rack is in place, and recording and evaluating;

4) after all the work is done, the height of the hydraulic jack support is adjusted to slowly fall back to the in-position height, the support stops falling back after the support and the net rack are uniformly stressed, the in-position height and the deviation are rechecked, the net rack in-position node is welded with the support after the design requirements are met, and the hydraulic jack support is finally unloaded after the welding is finished;

step six: dismantling the bracket:

and (4) after the net rack is in place, dismantling the jacking bracket.

Compared with the prior art, the invention has the beneficial effects that:

1. in the net rack jacking process, the net rack overturning stability and the central displacement control are the key of the net rack jacking technology, the vertical bearing structural column of the building is used as a guide rail to limit the horizontal displacement (force) generated in the installation process of the net rack on the roof, the displacement generated in the whole lifting process of the net rack is limited through the structural steel column, and the horizontal load generated by the jacking support system due to uneven stress is shared.

2. The invention is provided with the limiting overturn-preventing bracket, the horizontal displacement of the net rack is controllable, the construction is safe and reliable, and the construction quality is improved. The danger of overturning is not easy to happen.

3. The limiting overturn-preventing device is simple in manufacturing and convenient to operate, and the unfavorable load unloading generated in the jacking of the net rack is remarkable.

Drawings

FIG. 1 is a schematic structural diagram of a jacking process working state 1 of the present invention;

FIG. 2 is a schematic structural view of a jacking process operating state 2 of the present invention;

FIG. 3 is a schematic structural view of a working state 3 of the jacking process of the present invention;

FIG. 4 is a schematic structural view of a working state 4 of the jacking process of the present invention;

FIG. 5 is a schematic front view of a spacing anti-overturning bracket structure of the present invention;

FIG. 6 is a schematic top view of the structure of the limiting overturn-preventing support of the present invention.

In the figure: 1-measure support 2-jacking support 3-guide rail 4-hydraulic climbing top 5-limiting overturn-preventing support 6-stirrup 7-net rack 8-concrete foundation 9-middle bearing plate 10-steel wire rope 51-steel pipe limiting card 52-steel pipe supporting rod

Detailed Description

The invention will be further described with reference to the accompanying drawings in which: