阅读说明：本技术 一种大跨度钢结构网架提升施工工法 (Lifting construction method for large-span steel structure net rack ) 是由 张军 刘玉龙 岳庭 张斌 王辉 李岩 刘玲 于 2021-10-14 设计创作，主要内容包括：本发明公开了一种大跨度钢结构网架提升施工工法,涉及钢结构网架施工技术领域。本发明所述大跨度钢结构网架提升施工工法具体步骤如下：步骤1：钢网架地面拼装,步骤2：安装提升设备,步骤3：钢网架试提升,步骤4：钢网架提升。本发明通过设计的经济性,使得整体适用于一般工业与民用建筑中大跨度钢结构网架提升施工,且通过设计的安全性：提升支架与钢网架提升受力情况经有限元分析软件计算分析,确定其结构设计合理,原材料规格、液压提升器额定功率选型偏大,安全储备高,且通过设计的可操作性：网架主体地面拼装,安全、方便、快捷；超大型构件液压同步提升技术成熟,应用广泛,安全系数高。(The invention discloses a large-span steel structure net rack lifting construction method, and relates to the technical field of steel structure net rack construction. The construction method for lifting the large-span steel structure net rack comprises the following specific steps: step 1: assembling steel mesh frames on the ground, and step 2: installing lifting equipment, and step 3: and (4) trial lifting of the steel net rack, and step 4: and lifting the steel net frame. The invention is wholly suitable for the lifting construction of the large-span steel structure net rack in general industry and civil buildings through the economy of design, and through the safety of design: the lifting support and the steel mesh frame lifting stress condition are calculated and analyzed through finite element analysis software, the structural design is determined to be reasonable, the raw material specification and the rated power selection of the hydraulic lifter are large, the safety storage is high, and the operability through design is realized: the net rack main body is assembled on the ground, so that the method is safe, convenient and quick; the hydraulic synchronous lifting technology of the ultra-large member is mature, the application is wide, and the safety factor is high.)

1. A large-span steel structure net rack lifting construction method is characterized in that: the large-span steel structure net rack lifting construction method comprises the following specific steps:

step 1: assembling the steel net frame on the ground;

step 2: installing lifting equipment;

and step 3: trial lifting of the steel net rack;

and 4, step 4: lifting the steel net frame;

and 5: monitoring the process;

step 6: supplementing rod pieces after assembling;

and 7: and unloading the lifting device.

2. The construction method for lifting the large-span steel structure net rack according to claim 1, characterized in that: the step 1 comprises the following steps:

the first step is as follows: the total station is used for discharging the station house center mileage and the concrete column axis on the ground, the net rack welding ball axis is drawn by using a steel ruler on the basis of the concrete column axis, the assembly field is the concrete ground, the field is flat, the bearing capacity is good, the assembly jig frame can be directly arranged on the ground, the construction simulation calculation is carried out on the assembly jig frame according to the actual condition before the assembly, and the rigidity and the strength of the assembly jig frame are ensured to meet the assembly requirement;

the second step is that: placing the checked and accepted welding balls into the installation nodes according to specification and serial number, simultaneously adjusting the balls to have stress direction and position, generally placing the annular welding line of the horizontal central line of the ball in the equatorial direction, placing one side with ribs on the upper half part of the lower chord ball, arranging the prepared rod pieces according to the specified specification, before placing the rod pieces, checking the specification and size of the rod pieces, the groove and the gap of the welding line, placing the rod pieces between the two balls, adjusting the gap, point fixing, assembling the plane net rack from the central line to gradually expand towards the periphery, firstly forming a closed square grid, after controlling the size, assembling the peripheral grid, and continuously expanding;

the third step: the concrete column is characterized in that a lifting platform is arranged on the top of the concrete column and an embedded part, a temporary lifting lower lifting point pipe is arranged at the position, corresponding to an upper lifting point, of a lifting unit, hydraulic synchronous lifting system equipment is arranged, the hydraulic synchronous lifting system equipment comprises a hydraulic pump source system, a lifter, a sensor and the like, and a special bottom anchor and a special steel strand are arranged between the upper lifting point and the lower lifting point.

3. The construction method for lifting the large-span steel structure net rack according to claim 1, characterized in that: the step 3 specifically comprises the following steps:

the method comprises the steps of performing trial lifting before formal lifting, debugging a hydraulic lifting system, after the hydraulic lifting system is confirmed to be correct, loading step by step according to the sequence of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of design load until a lifting unit is separated from an assembly platform, lifting the lifting unit 150mm away from the ground, standing for 4-12 hours, suspending lifting, checking the safety and reliability of lifting equipment and the influence of lifting points on the rigidity of a net rack, and checking the reliability of the whole lifting scheme.

4. The construction method for lifting the large-span steel structure net rack according to claim 1, characterized in that: the step 4 comprises the following steps:

the first step is as follows: after the steel net rack is tried to be lifted and confirmed to have no abnormal condition, formal lifting is started, in the lifting process, height fine adjustment is needed due to the air attitude adjustment, post-installed rod piece installation and the like, before the fine adjustment is started, a computer synchronous control system is switched from an automatic mode to a manual mode, synchronous fine adjustment is conducted on hydraulic lifters of all lifting points in the whole hydraulic lifting system according to needs, or fine adjustment is conducted on a single hydraulic lifter, the fine adjustment, namely the inching adjustment precision can reach a millimeter level, and the precision requirement of structural installation can be completely met;

the second step is that: when the lifting unit is lifted to a distance of about 200mm from the designed elevation, the lifting is suspended, fine adjustment of each lifting point enables the structure to be accurately lifted to reach the designed position, the hydraulic lifting system equipment is suspended to work, the air posture of the lifting unit is kept, the post-installed rod piece is installed, the lifting unit structure forms an integral stable stress system, the hydraulic lifting system equipment is synchronously decompressed until the steel strand is completely loosened, the hydraulic lifting system equipment and related temporary measures are removed, and the integral lifting installation of the lifting unit is completed.

Technical Field

The invention relates to the technical field of steel structure net rack construction, in particular to a large-span steel structure net rack lifting construction method.

Background

In recent years, in many engineering applications, a grid structure replaces reinforced concrete, and is widely applied, the grid structure is a spatial structure formed by connecting a plurality of rod pieces through nodes according to a certain grid form, and has the advantages of small spatial stress, light weight, high rigidity, good anti-seismic performance and the like, and the grid structure can be used as a roof of buildings such as a gymnasium, a movie theater, an exhibition hall, a waiting hall, a stadium awning, an hangar, a bidirectional large-column-distance workshop and the like.

Disclosure of Invention

The invention aims to provide a large-span steel structure net rack lifting construction method, which aims to solve the existing problems: the existing grid structure has defects in economy, safety and operability in the process of lifting construction.

In order to achieve the purpose, the invention provides the following technical scheme: a large-span steel structure net rack lifting construction method comprises the following concrete steps:

step 1: assembling the steel net frame on the ground;

step 2: installing lifting equipment;

and step 3: trial lifting of the steel net rack;

and 4, step 4: lifting the steel net frame;

and 5: monitoring the process;

step 6: supplementing rod pieces after assembling;

and 7: and unloading the lifting device.

Preferably, the step 1 comprises the following steps:

the first step is as follows: the method comprises the following steps of (1) discharging station house center mileage and concrete column axes on the ground by using a total station, wherein the longitudinal distance between the concrete column axes is 9m and 12m, the transverse distance is 8m, on the basis of the concrete column axes, a net rack welding ball axis is drawn by using a steel ruler, the longitudinal distance between the welding ball axis is 3m, and the transverse distance is 2.667 m;

the second step is that: placing the checked and accepted welding balls into the installation nodes according to specification and number, simultaneously adjusting the balls to have stress direction and position, generally placing the annular welding line of the horizontal central line of the balls in the equatorial direction, placing one side with ribs on the upper half part of the lower chord ball, arranging prepared rod pieces according to the specified specification, before placing the rod pieces, checking the specification and size of the rod pieces, a groove and a welding line gap, placing the rod pieces between the two balls, adjusting the gap, point fixing, assembling a plane net rack from the central line, gradually expanding towards the periphery, firstly forming a closed square grid, after controlling the size, then assembling the peripheral grid, continuously expanding, paying attention to control accumulated error, and preferably using negative tolerance for the common grid;

the third step: the concrete column is characterized in that a lifting platform is arranged on the top of the concrete column and an embedded part, a temporary lifting lower lifting point pipe is arranged at the position, corresponding to an upper lifting point, of a lifting unit, hydraulic synchronous lifting system equipment is arranged, the hydraulic synchronous lifting system equipment comprises a hydraulic pump source system, a lifter, a sensor and the like, and a special bottom anchor and a special steel strand are arranged between the upper lifting point and the lower lifting point.

The specification of the front upright post of the lifting platform is P159 multiplied by 10, the specification of the rear upright post is P140 multiplied by 8, the specification of the distribution beam is B200 multiplied by 12, the specification of the lifting beam is B300 multiplied by 250 multiplied by 12, the material quality is Q355B, all rod pieces of the lifting platform are connected by welding, all welding seams adopt penetration welding seams, the grade of the welding seams is two levels, and the stiffening plates adopt double-sided fillet welding seams for connection;

the lifting lower lifting point consists of a temporary rod and a temporary pipe. One end of the temporary rod is connected to the node ball of the roof structure, the other end of the temporary rod is welded to the temporary pipe, the specification of the temporary rod 1 is P88.5x4, the specification of the temporary rod 2 is P140x4, the specification of the temporary pipe is P219x14, the material is Q355B, the temporary rod and the temporary pipe are connected by welding, the welding seam is a penetration welding seam, and the welding seam is of a second grade.

Preferably, the step 3 specifically comprises:

the method comprises the steps of performing trial lifting before formal lifting, debugging a hydraulic lifting system, after the hydraulic lifting system is confirmed to be correct, loading step by step according to the sequence of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of design load until a lifting unit is separated from an assembly platform, lifting the lifting unit 150mm away from the ground, standing for 4-12 hours, suspending lifting, checking the safety and reliability of lifting equipment and the influence of lifting points on the rigidity of a net rack, and checking the reliability of the whole lifting scheme.

Preferably, the step 4 comprises the following steps:

the first step is as follows: after the steel net rack is tried to be lifted and confirmed to have no abnormal condition, formal lifting is started, in the lifting process, height fine adjustment is needed due to the air attitude adjustment, post-installed rod piece installation and the like, before the fine adjustment is started, the automatic mode of the computer synchronous control system is switched into the manual mode, and the hydraulic lifters of all lifting points in the whole hydraulic lifting system are synchronously and slightly moved to achieve lifting or descending or the hydraulic lifters are slightly moved to be adjusted. The micro-motion, namely inching, adjustment precision can reach millimeter level, and the precision requirement of structural installation can be completely met;

the second step is that: when the lifting unit is lifted to a distance of about 200mm from the designed elevation, the lifting is suspended, fine adjustment of each lifting point enables the structure to be accurately lifted to the designed position, the hydraulic lifting system equipment is suspended to work, the air posture of the lifting unit is kept, and the post-installed rod piece is installed, so that the lifting unit structure forms an integral stable stress system. And synchronously decompressing the hydraulic lifting system equipment until the steel strand is completely loosened, dismantling the hydraulic lifting system equipment and related temporary measures, and completing the integral lifting installation of the lifting unit.

Preferably, the step 5 specifically comprises:

the measuring instrument is used for detecting the ground clearance of each lifting point in the lifting process, the relative height difference of each lifting point is calculated, the height of each lifting point is adjusted through the hydraulic lifting system equipment, the lifting unit is enabled to reach the design posture, in the lifting process, height fine adjustment is needed due to aerial posture adjustment, rear-mounted rod piece installation and the like, before fine adjustment is started, the automatic mode of the computer synchronous control system is switched into the manual mode, the working condition of each lifting point is monitored through the system all the time, and grid instability is avoided.

Preferably, the step 6 specifically includes:

after the steel net frame is lifted in place, the main steel beam chord member of the steel structure lifting unit is in butt joint with the pre-assembly section rod member, the steel beam post-assembly rod member is installed, and the steel net frame is integrally formed after the installation is finished.

Preferably, the step 7 specifically comprises:

unloading the lifting points of the hydraulic lifting system in sequence to transfer the self weight of the steel structure to the main structure to achieve a design state; and (5) dismantling the hydraulic lifting equipment, and finishing the steel structure lifting operation.

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

1. the invention is wholly suitable for the lifting construction of the large-span steel structure net rack in general industrial and civil buildings through the economy of design;

2. the invention has the following safety through design: the lifting stress conditions of the lifting bracket and the steel mesh frame are calculated and analyzed through finite element analysis software, the structural design is determined to be reasonable, the raw material specification and the rated power of the hydraulic lifter are large in selection, and the safety reserve is high;

3. the invention is characterized by the operability of design: the net rack main body is assembled on the ground, so that the method is safe, convenient and quick; the hydraulic synchronous lifting technology of the ultra-large member is mature, the application is wide, and the safety factor is high.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic flow diagram of the present invention as a whole;

FIG. 2 is a schematic view of the assembled jig frame axis of the present invention;

FIG. 3 is a schematic view of the ground assembly of the steel net rack of the present invention;

FIG. 4 is a three-dimensional schematic view of a lift platform according to the present invention;

FIG. 5 is a schematic diagram of a temporary pipe work application of the present invention;

FIG. 6 is a schematic diagram of the trial lifting of the steel net rack of the present invention;

FIG. 7 is a human-machine interface of the hydraulic synchronous lifting computer control system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Please refer to fig. 1:

a large-span steel structure net rack lifting construction method comprises the following concrete steps:

step 1: assembling the steel net frame on the ground;

step 2: installing lifting equipment;

and step 3: trial lifting of the steel net rack;

and 4, step 4: lifting the steel net frame;

and 5: monitoring the process;

step 6: supplementing rod pieces after assembling;

and 7: and unloading the lifting device.

Analyzing and simulating the operability of each procedure for lifting the steel structure net rack by using a BIM technology; analyzing the stress condition of each working condition when the lifting bracket and the steel mesh frame are lifted by utilizing a finite element; the grid structure is assembled on the ground, and the whole grid structure is lifted in place by utilizing the ultra-large member hydraulic synchronous lifting technology. The net rack integral lifting construction method is adopted, the purposes of safety, economy and simple and convenient construction are achieved, and a good effect is obtained in engineering application;

please refer to fig. 2-5:

the step 1 comprises the following steps:

the first step is as follows: the method comprises the following steps of (1) discharging station house center mileage and concrete column axes on the ground by using a total station, wherein the longitudinal distance between the concrete column axes is 9m and 12m, the transverse distance is 8m, on the basis of the concrete column axes, a net rack welding ball axis is drawn by using a steel ruler, the longitudinal distance between the welding ball axis is 3m, and the transverse distance is 2.667 m;

the second step is that: placing the checked and accepted welding balls into the installation nodes according to specification and number, simultaneously adjusting the balls to have stress direction and position, generally placing the annular welding line of the horizontal central line of the balls in the equatorial direction, placing one side with ribs on the upper half part of the lower chord ball, arranging prepared rod pieces according to the specified specification, before placing the rod pieces, checking the specification and size of the rod pieces, a groove and a welding line gap, placing the rod pieces between the two balls, adjusting the gap, point fixing, assembling a plane net rack from the central line, gradually expanding towards the periphery, firstly forming a closed square grid, after controlling the size, then assembling the peripheral grid, continuously expanding, paying attention to control accumulated error, and preferably using negative tolerance for the common grid;

the third step: the concrete column is characterized in that a lifting platform is arranged on the top of the concrete column and an embedded part, a temporary lifting lower lifting point pipe is arranged at the position, corresponding to an upper lifting point, of a lifting unit, hydraulic synchronous lifting system equipment is arranged, the hydraulic synchronous lifting system equipment comprises a hydraulic pump source system, a lifter, a sensor and the like, and a special bottom anchor and a special steel strand are arranged between the upper lifting point and the lower lifting point.

The specification of the front upright post of the lifting platform is P159 multiplied by 10, the specification of the rear upright post is P140 multiplied by 8, the specification of the distribution beam is B200 multiplied by 12, the specification of the lifting beam is B300 multiplied by 250 multiplied by 12, the material quality is Q355B, all rod pieces of the lifting platform are connected by welding, all welding seams adopt penetration welding seams, the grade of the welding seams is two levels, and the stiffening plates adopt double-sided fillet welding seams for connection;

the lifting lower lifting point consists of a temporary rod and a temporary pipe. One end of a temporary rod is connected to a node ball of the roof structure, the other end of the temporary rod is welded to a temporary pipe, the specification of the temporary rod 1 is P88.5x4, the specification of the temporary rod 2 is P140x4, the specification of the temporary pipe is P219x14, the materials are all Q355B, the temporary rod and the temporary pipe are connected by welding, the welding seams are penetration welding seams, and the welding seam grade is two-stage;

please refer to fig. 6:

the step 3 specifically comprises the following steps:

the method comprises the steps of performing trial lifting before formal lifting, debugging a hydraulic lifting system, after confirming that no fault exists, loading step by step according to the sequence of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of design load until a lifting unit is separated from an assembly platform, lifting the lifting unit 150mm away from the ground, standing for 4-12 hours, suspending lifting, checking the safety and reliability of lifting equipment and the influence of lifting points on the rigidity of a net rack, and checking the reliability of the whole lifting scheme;

please refer to fig. 6:

the step 4 comprises the following steps:

the first step is as follows: after the steel net rack is tried to be lifted and confirmed to have no abnormal condition, formal lifting is started, in the lifting process, height fine adjustment is needed due to the air attitude adjustment, post-installed rod piece installation and the like, before the fine adjustment is started, the automatic mode of the computer synchronous control system is switched into the manual mode, and the hydraulic lifters of all lifting points in the whole hydraulic lifting system are synchronously and slightly moved to achieve lifting or descending or the hydraulic lifters are slightly moved to be adjusted. The micro-motion, namely inching, adjustment precision can reach millimeter level, and the precision requirement of structural installation can be completely met;

the second step is that: when the lifting unit is lifted to a distance of about 200mm from the designed elevation, the lifting is suspended, fine adjustment is carried out on each lifting point to enable the structure to be accurately lifted to reach the designed position, the hydraulic lifting system equipment is suspended to work, the air posture of the lifting unit is kept, a rod piece is installed after the lifting unit is installed, the lifting unit structure forms an integral stable stress system, the hydraulic lifting system equipment is synchronously decompressed until the steel strand is completely loosened, the hydraulic lifting system equipment and related temporary measures are removed, and the integral lifting installation of the lifting unit is completed;

the step 5 specifically comprises the following steps:

the method comprises the following steps that a measuring instrument is used for detecting the ground clearance of each lifting point in the lifting process, the relative height difference of each lifting point is calculated, the height of each lifting point is adjusted through a hydraulic lifting system device, so that a lifting unit reaches a designed posture, in the lifting process, height fine adjustment is needed due to aerial posture adjustment, rear-mounted rod piece installation and the like, before fine adjustment is started, a computer synchronous control system is switched from an automatic mode to a manual mode, the working condition of each lifting point is monitored through the system all the time, and the instability of a net rack is avoided;

the step 6 specifically comprises the following steps:

after the steel net frame is lifted in place, the main steel beam chord member of the steel structure lifting unit is butted with the pre-assembly section rod member, the steel beam post-assembly rod member is installed, and the steel net frame is integrally formed after the installation is finished;

the step 7 specifically comprises the following steps:

unloading the lifting points of the hydraulic lifting system in sequence to transfer the self weight of the steel structure to the main structure to achieve a design state; and (5) dismantling the hydraulic lifting equipment, and finishing the steel structure lifting operation.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.