CN112912567B - Integral lifting construction method for L-shaped bidirectional overhanging structure - Google Patents

Integral lifting construction method for L-shaped bidirectional overhanging structure Download PDF

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CN112912567B
CN112912567B CN201980058953.4A CN201980058953A CN112912567B CN 112912567 B CN112912567 B CN 112912567B CN 201980058953 A CN201980058953 A CN 201980058953A CN 112912567 B CN112912567 B CN 112912567B
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lifting
shaped bidirectional
overhanging
overhanging structure
temporary
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CN112912567A (en
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王龙
梁湖清
陈臻颖
陈振明
卢德辉
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Guangzhou Jianshe Bay District Zhizao Technology Co ltd
Guangzhou Wuyang Construction Machinery Co ltd
Guangzhou Construction Co Ltd
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Guangzhou Jianshe Bay District Zhizao Technology Co ltd
Guangzhou Wuyang Construction Machinery Co ltd
Guangzhou Construction Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

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Abstract

The integral lifting construction method of the L-shaped bidirectional overhanging structure comprises the steps of pre-assembling the L-shaped bidirectional overhanging structure (1) on the ground, and adjusting the gravity center of the L-shaped bidirectional overhanging structure (1) by using an assembled auxiliary structure (2) and a temporary counterweight (3) according to an upper lifting point and the gravity center of the L-shaped bidirectional overhanging structure (1) so that the L-shaped bidirectional overhanging structure (1) has good anti-overturning performance and stability in the lifting process.

Description

Integral lifting construction method for L-shaped bidirectional overhanging structure
Technical Field
The invention belongs to the technical field of integral lifting construction, and mainly relates to an integral lifting construction method for an L-shaped bidirectional overhanging structure.
Background
The mechanization, automation and informatization degree of building construction are one of the important marks of national or regional building science and technology level. However, as society develops, standards of pursuit of material culture are increased, and various buildings also pursue artistic expression and visual impact effect while developing higher and larger. The construction method has the advantages that a large number of buildings are in the conditions of complex structures and complex construction environment conditions, so that a large number of engineering structures in China still adopt extensive, labor-intensive and low-technical-level construction modes such as a high-altitude bulk method and the like, time and labor are consumed, the construction quality and safety are not easy to guarantee, and the construction method is not suitable for the status of the world in China.
The L-shaped bidirectional overhanging structure is used as a modern modeling building structure and is increasingly applied to the design of modern buildings so as to achieve excellent artistic expressive force, but for the structural construction under the conditions of complex structure and complex construction environmental conditions, the prior art still adopts extensive construction modes such as a high-altitude bulk method and the like, the time and the labor are consumed, the construction quality and the safety are not easy to guarantee, the efficiency is extremely low while accidents are easy to happen, and the large defect exists.
Disclosure of Invention
The invention aims to provide an integral lifting construction method of an L-shaped bidirectional overhanging structure aiming at the defects of the existing method, effectively solves the construction industry problems of low efficiency, high accident rate and the like of high-altitude operation in the construction of the structure in the prior art, and is safe, reliable, economical and practical.
In order to solve the technical problem, the invention is implemented by the following scheme:
the integral lifting construction method of the L-shaped bidirectional overhanging structure is characterized by comprising the following steps of:
determining an upper lifting point of the L-shaped bidirectional overhanging structure;
the L-shaped bidirectional overhanging structure is assembled on the ground or floor projected below the structural installation position to form a lifting whole;
analyzing the L-shaped bidirectional overhanging structure and the upper lifting point through a gravity center analysis formula, and determining the position of the assembly type auxiliary structure and the weight and the position of the temporary counterweight; the temporary counterweight is used for adjusting the gravity center of the L-shaped bidirectional overhanging structure so as to ensure the anti-overturning performance and stability of the L-shaped bidirectional overhanging structure in the lifting process;
arranging the assembled auxiliary structure on the L-shaped bidirectional overhanging structure, and arranging the temporary counterweight on the assembled auxiliary structure;
and lifting the L-shaped bidirectional overhanging structure to be in place and connected and fixed to complete structural installation.
Compared with the prior art, the method has the following beneficial effects:
the invention discloses an integral lifting construction method of an L-shaped bidirectional cantilever structure, which comprises the steps of pre-assembling the L-shaped bidirectional cantilever structure on the ground, and adjusting the gravity center of the L-shaped bidirectional cantilever structure by using an assembly type auxiliary structure and a temporary counterweight according to a lifting point and the gravity center of the L-shaped bidirectional cantilever structure so that the L-shaped bidirectional cantilever structure has good anti-overturning performance and stability in the lifting process.
In a further development of the invention, the method further comprises:
and dismantling the assembled auxiliary structure and the temporary counterweight after the structure is installed.
A further development of the invention consists in that the determination of the lifting point follows the following principle:
determining the position of the upper lifting point at the anchoring end of the L-shaped bidirectional overhanging structure according to the total lifting weight, the counter force of the lifting point and the comprehensive consideration of lifting equipment, and enabling the upper lifting point to envelop the anchoring end of the L-shaped bidirectional overhanging structure to the maximum extent; so set up, can arrange the hoisting point rationally to guarantee that the two-way structure of encorbelmenting of L type obtains effectual support at the in-process that rises.
A further improvement of the invention is that the step of determining the position of the fabricated auxiliary structure and the weight and position of the temporary counterweight comprises:
determining the structural weight and the structural gravity center of the L-shaped bidirectional overhanging structure;
determining the gravity center of a lifting point of a graph formed by enveloping the upper lifting point;
determining the position of the assembled auxiliary structure and the position of the temporary counterweight between the anchoring ends of the L-shaped bidirectional overhanging structure;
and determining the weight of the temporary counterweight by combining the structure weight according to the moment relation formed among the structure gravity center, the lifting point gravity center and the temporary counterweight position, so that the structure gravity center of the L-shaped bidirectional cantilever structure after the temporary counterweight is configured is positioned in a graph formed by enveloping the upper lifting point.
Through the steps, the gravity center of the L-shaped bidirectional overhanging structure and the gravity center of the hanging point enveloping graph can be integrated, the positions of the assembled auxiliary structure and the temporary counter weight and the corresponding counter weight are reasonably configured, so that the gravity center of the L-shaped bidirectional overhanging structure is positioned in the hanging point enveloping graph, the stability and the safety in the lifting process are greatly improved, and the lifting accident of tipping is prevented.
The invention is further improved in that the assembled auxiliary structure is arranged between the nearest two points of the anchoring end of the L-shaped bidirectional overhanging structure.
The invention is further improved in that the assembly type auxiliary structure is a temporary truss structure capable of being quickly assembled and disassembled, further, the rod pieces of the assembly type truss structure are I-shaped steel, all the assembly units are connected through bolts, and through the arrangement, the assembly type truss structure adopting the I-shaped steel as the rod pieces has enough stability, is convenient to directly disassemble after construction, and improves the construction efficiency.
The invention is further improved in that the temporary counterweight is fixed on the assembled auxiliary structure in an easily detachable mode, and is a tower crane counterweight block or a concrete pouring block or traction force provided by a winch so as to be convenient to detach and improve the construction efficiency.
The invention further improves the method that the step of dismantling the temporary counterweight is to lower the tower crane counterweight block or the concrete pouring block to the ground for dismantling or unload the traction force of the winch.
Drawings
Fig. 1 is a schematic step diagram of an overall lifting construction method for an L-shaped bidirectional overhanging structure according to an embodiment of the present invention;
FIG. 2 is a schematic plan view of an L-shaped bi-directional cantilever structure according to an embodiment of the present invention;
fig. 3 is a schematic layout of an overall lifting temporary counterweight and lifting system of an L-shaped bidirectional overhanging structure according to an embodiment of the present invention;
fig. 4 is a schematic view of the arrangement of the temporary weights on the fabricated auxiliary structure according to the embodiment of the present invention.
In the figure:
10-existing building; 1-L type bidirectional overhanging structure; 2-an assembled auxiliary structure; 11-a hoisting point; 3-temporary counterweight; 4-hydraulic lifter.
Detailed Description
For a fuller understanding of the objects, features and effects of the present invention, reference should be made to the following detailed description taken together with the accompanying figures wherein the spirit, steps and effects of the method of the present invention are described.
As shown in fig. 1, the present embodiment discloses an overall hoisting construction method for an L-shaped bidirectional overhanging structure, which is suitable for performing overall hoisting construction on the L-shaped bidirectional overhanging structure shown in fig. 2, and includes the following steps:
s1, determining an upper lifting point of an L-shaped bidirectional overhanging structure; specifically, the determination of the upper lifting point follows the following principle:
determining the position of an upper lifting point at the anchoring end of the L-shaped bidirectional overhanging structure according to the total lifting weight, the counter force of the lifting point and the comprehensive consideration of lifting equipment, and enabling the upper lifting point to envelop the anchoring end of the L-shaped bidirectional overhanging structure to the maximum extent; as shown in fig. 2, the lifting point can only be placed at two anchoring ends on the right side and the upper side of the L-shaped bidirectional overhanging structure to provide a supporting position, wherein the reference numeral 11 is the position of the lifting point to be selected for lifting the whole structure, and the upper lifting point is arranged according to the principle, so that the L-shaped bidirectional overhanging structure can be effectively supported in the lifting process.
S2, assembling an L-shaped bidirectional overhanging structure on the ground or the floor projected below the structure installation position to form a lifting whole;
s3, analyzing the L-shaped bidirectional overhanging structure and the upper lifting point through a gravity center analysis formula, and determining the position of the assembled auxiliary structure and the weight and the position of the temporary counterweight; specifically, the method comprises the following steps:
(1) As shown in FIG. 3, it is assumed that the horizontal and vertical sections of the L-shaped bidirectional cantilever structure 1 have widths a and b, respectively, and lengths L1、l2. And the left lower corner is taken as the origin of coordinates, the hoisting point can be only arranged at the supporting positions of the anchoring ends AB and CD at the upper side and the right side. The plane of the L-shaped bidirectional cantilever structure 1 is divided into two parts, namely ABOE and CDEF, and the centroids are O1(l1/2,a/2),O2(b/2,(l2+ a)/2) of the two parts:
S1=al1
S2=b(l2-a)
and the plane area of the L-shaped bidirectional overhanging structure ABOCDF: s = al1+bl2-ab
The gravity center of the L-shaped bidirectional overhanging structure ABOCDF is assumed to be OS(xs,ys) Then, according to the principle of moment balance:
Figure BDA0002968242630000051
Figure BDA0002968242630000052
as can be seen from the figure, the lifting point can only be set in the range of the line segments AB and CD, and the maximum envelope range of the lifting point is the figure ABCD. The equation for line BC is expressed as:
Figure BDA0002968242630000053
substituting the centroid coordinate of the L-shaped bidirectional overhanging structure ABOCDF into the formula, has:
Figure BDA0002968242630000054
the above formula shows that it is obvious that the center of gravity O of the L-shaped bidirectional cantilever structure 1SAnd if no measures are taken, the lifting structure can be tipped once being lifted, and the whole lifting construction cannot be carried out. Therefore, the gravity center of the L-shaped bidirectional cantilever structure 1 needs to be adjusted to be within the envelope range of the hoisting point and to be as close to the gravity center of the hoisting point of the envelope graph of the hoisting point as possible, so that the anti-overturning performance and the stability in the lifting process are ensured, and the smooth operation of the integral lifting construction can be ensured;
the equation for the straight line AD is:
Figure BDA0002968242630000061
(2) Let the gravity center of the suspension point envelope pattern ABCD be Q (x)Q,yQ) Then, the formula is calculated according to the center of gravity of the convex polygon:
Figure BDA0002968242630000062
Figure BDA0002968242630000063
(3) Let a straight line OSThe intersection points of Q and straight lines BC and AD are K and P respectively. In order to achieve better center of gravity adjustment, the fabricated auxiliary structure 2 should be arranged along the straight line AD, and the concentrated load applied as the center of gravity of the adjustment lifting structure should be applied at point P. Assuming that the total weight of the L-shaped bidirectional overhanging structure ABOCDF is G, in order to normally perform the whole lifting construction, the gravity center of the lifting structure after adjustment should be positioned in the envelope area ABCD of the lifting point, assuming that the gravity center of the lifting structure after adjustment is just positioned at the K point on the boundary of the envelope area of the lifting point, and the applied counterweight load is G0Then, in order to satisfy stability and safety during the lifting process, a counter weight load G is appliedPIt should satisfy:
Figure BDA0002968242630000064
Figure BDA0002968242630000065
Figure BDA0002968242630000066
according to OSQ point, a straight line O can be obtainedSEquation for Q:
Figure BDA0002968242630000067
from the equations of the straight lines AD and BC, a given straight line O can be obtainedSCoordinates of intersection points K and P of Q and straight lines BC and AD:
Figure BDA0002968242630000068
Figure BDA0002968242630000069
wherein the content of the first and second substances,
Figure BDA0002968242630000071
Figure BDA0002968242630000072
Figure BDA0002968242630000073
Figure BDA0002968242630000074
preferably, the adjusted center of gravity O of the structure is used to better ensure stability and safety during liftingS' As close as possible to the center of gravity Q of the hoisting point envelope pattern ABCD when OS' when coinciding with Q, stability during lifting is best, when a weight needs to be applied:
Figure BDA0002968242630000075
Figure BDA0002968242630000076
Figure BDA0002968242630000077
s4, arranging an assembly type auxiliary structure on the L-shaped bidirectional overhanging structure, and arranging a temporary counterweight on the assembly type auxiliary structure; and lifting the L-shaped bidirectional overhanging structure to be in place, connecting and fixing to complete structural installation, and dismantling the assembled auxiliary structure and the temporary counterweight.
Specifically, as shown in fig. 4, the counterweight 3 is suspended by the hydraulic lifter 4 and temporarily fixed on the auxiliary structure 2, the L-shaped bidirectional suspension structure 1 is lifted in place and connected and fixed, the counterweight 3 is conveniently removed by the hydraulic lifter 4, and the auxiliary structure 2 is further removed to complete the whole installation process of the structure. Preferably, the assembly type auxiliary structure 2 is a temporary truss structure capable of being quickly assembled and disassembled, the rod pieces of the assembly type auxiliary structure can be made of I-shaped steel, all the assembly units are connected through bolts, and through the arrangement, the assembly type truss structure taking the I-shaped steel as the rod pieces has enough stability, is convenient to directly disassemble after construction, and improves the construction efficiency. Preferably, the temporary counterweight 3 can also be selected from a tower crane counterweight block or a concrete pouring block or adopt the traction force provided by a winch so as to be convenient for disassembly and improve the construction efficiency, and correspondingly, in the step of disassembling the temporary counterweight, the tower crane counterweight block or the concrete pouring block can also be lowered to the ground for disassembly or the traction force of the winch is unloaded.
The construction method for integrally lifting the L-shaped bidirectional overhanging structure firstly pre-assembles the L-shaped bidirectional overhanging structure on the ground, and adjusts the gravity center of the L-shaped bidirectional overhanging structure by using the assembly type auxiliary structure and the temporary counter weight according to the gravity center of the upper lifting point and the L-shaped bidirectional overhanging structure so as to ensure that the L-shaped bidirectional overhanging structure has good anti-overturning performance and stability in the lifting process.
While the preferred embodiments of the present invention have been described in detail, it should be understood that modifications and variations can be made by persons skilled in the art without inventive faculty, and will be apparent to those skilled in the art. Therefore, any method scheme which can be obtained by a person skilled in the art of the method based on the present invention through logic analysis, reasoning or limited experiments based on the existing method should be within the protection scope determined by the present invention.

Claims (7)

1. An integral lifting construction method for an L-shaped bidirectional overhanging structure is characterized by comprising the following steps:
determining an upper lifting point of the L-shaped bidirectional overhanging structure;
assembling the L-shaped bidirectional overhanging structure on the ground or floor projected below the structure installation position to form a lifting whole;
analyzing the L-shaped bidirectional overhanging structure and the upper hanging point through a gravity center analysis formula, and determining the position of the assembled auxiliary structure and the weight and the position of the temporary counterweight; the temporary counterweight is used for adjusting the gravity center of the L-shaped bidirectional overhanging structure so as to ensure the anti-overturning performance and stability of the L-shaped bidirectional overhanging structure in the lifting process;
arranging the assembled auxiliary structure on the L-shaped bidirectional overhanging structure, and arranging the temporary counterweight on the assembled auxiliary structure;
lifting the L-shaped bidirectional overhanging structure to be in place, connecting and fixing to complete structural installation;
wherein the determination of the lifting point follows the following principle:
determining the position of the upper lifting point at the anchoring end of the L-shaped bidirectional overhanging structure according to the total lifting weight, the counter force of the lifting point and the comprehensive consideration of lifting equipment, and enabling the upper lifting point to envelop the anchoring end of the L-shaped bidirectional overhanging structure to the maximum extent;
wherein the step of determining the position of the fabricated auxiliary structure and the weight and position of the temporary counterweight comprises:
determining the structural weight and the structural gravity center of the L-shaped bidirectional overhanging structure;
determining the gravity center of a lifting point of a graph formed by enveloping the upper lifting point;
determining the position of the fabricated auxiliary structure and the position of the temporary counterweight between the anchoring ends of the L-shaped bidirectional overhanging structure;
and determining the weight of the temporary counterweight by combining the structural weight according to the moment relation formed among the structural gravity center, the lifting point gravity center and the position of the temporary counterweight, so that the structural gravity center of the L-shaped bidirectional overhanging structure after the temporary counterweight is configured is positioned in a graph formed by enveloping the upper lifting point, and the assembled auxiliary structure is arranged between the nearest two points of the anchoring end of the L-shaped bidirectional overhanging structure.
2. The construction method for integrally lifting an L-shaped bidirectional overhanging structure according to claim 1, further comprising:
and after the structure is installed, the assembled auxiliary structure and the temporary counterweight are removed.
3. The method as claimed in claim 1, wherein the auxiliary structure is a temporary truss structure which can be quickly assembled and disassembled.
4. The construction method for integrally lifting the L-shaped bidirectional overhanging structure according to claim 3, wherein the rod pieces of the assembled truss structure are I-shaped steel, and all the assembling units are connected by bolts.
5. The construction method for integrally lifting an L-shaped bidirectional overhanging structure according to claim 1, wherein the temporary weight is fixed on the fabricated auxiliary structure in a detachable manner.
6. The construction method for integrally lifting the L-shaped bidirectional overhanging structure according to claim 2, wherein the temporary counterweight is a tower crane counterweight block or a concrete pouring block, or traction force provided by a winch.
7. The construction method for integrally lifting an L-shaped bidirectional overhanging structure according to claim 6, wherein the step of removing the temporary counterweight is to lower the tower crane counterweight block or the concrete pouring block to the ground for removal or to unload the traction force of the winch.
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CN101725115A (en) * 2009-12-18 2010-06-09 中铁大桥局集团第二工程有限公司 Fixed hoisting bracket device for pushing steel box girder and construction method thereof
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CN102767289A (en) * 2012-07-12 2012-11-07 广州建筑股份有限公司 Asymmetric and integrated lifting construction method for large scale grid structure
CN106012864A (en) * 2016-07-27 2016-10-12 中铁上海工程局集团有限公司 Method for lifting and installing whole bridge arch rib
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CN107673205A (en) * 2017-09-30 2018-02-09 上海建工五建集团有限公司 The component gravity center posture automatic regulating apparatus and method of prefabricated part hanging
CN109208478A (en) * 2017-06-30 2019-01-15 中交第二航务工程局有限公司 A kind of prefabricated assembled bridge integration rapid constructing method
KR101946332B1 (en) * 2018-10-29 2019-02-11 엄부섭 Tower crane to enhance safety

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10184020A (en) * 1996-12-24 1998-07-14 Futaba Seisakusho:Kk Chain type hoisting accessory and erection of building structure
CN101725115A (en) * 2009-12-18 2010-06-09 中铁大桥局集团第二工程有限公司 Fixed hoisting bracket device for pushing steel box girder and construction method thereof
CN201990370U (en) * 2011-02-22 2011-09-28 北车风电有限公司 Complete machine hanger with adjustable center of gravity
CN102767289A (en) * 2012-07-12 2012-11-07 广州建筑股份有限公司 Asymmetric and integrated lifting construction method for large scale grid structure
CN106012864A (en) * 2016-07-27 2016-10-12 中铁上海工程局集团有限公司 Method for lifting and installing whole bridge arch rib
CN107100309A (en) * 2017-06-26 2017-08-29 福建省闽南建筑工程有限公司 A kind of construction method for the large-scale multi-angular cantilever frame of integral hoisting
CN109208478A (en) * 2017-06-30 2019-01-15 中交第二航务工程局有限公司 A kind of prefabricated assembled bridge integration rapid constructing method
CN107673205A (en) * 2017-09-30 2018-02-09 上海建工五建集团有限公司 The component gravity center posture automatic regulating apparatus and method of prefabricated part hanging
KR101946332B1 (en) * 2018-10-29 2019-02-11 엄부섭 Tower crane to enhance safety

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