CN109537800B - Super-large span cantilever prestress arc-shaped steel beam structure and construction method thereof - Google Patents
Super-large span cantilever prestress arc-shaped steel beam structure and construction method thereof Download PDFInfo
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- CN109537800B CN109537800B CN201811449667.4A CN201811449667A CN109537800B CN 109537800 B CN109537800 B CN 109537800B CN 201811449667 A CN201811449667 A CN 201811449667A CN 109537800 B CN109537800 B CN 109537800B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/10—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal prestressed
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
- E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
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Abstract
The invention relates to a super-large span overhanging prestressed arc-shaped steel beam structure, which comprises: one end of the I-beam body is an installation end part, the other end of the I-beam body is an overhanging end part, and a bending part is formed in the middle of the I-beam body; a support member fixedly arranged on the lower flange plate and corresponding to the bending part; and one end of the prestressed stay cable is fixed on the mounting end part, the other end of the prestressed stay cable is fixed on the overhanging end part through the anchoring head after the prestressed stay cable applies the preset prestress, the prestressed stay cable corresponds to the part of the bending part, which is erected on the supporting part, and the prestressed stay cable is symmetrically arranged on two sides of the web plate. According to the invention, the prestressed guys are arranged on the two sides of the I-beam body, and when the arc-shaped steel beam structure is subjected to external vertical load, the tensioned prestressed guys can bear partial tensile force, so that the stress of the I-beam body is reduced, the flange plates and the web plates of the I-beam body are effectively protected, and the situations of buckling instability damage or strength damage of the flange plates and the web plates are avoided.
Description
Technical Field
The invention relates to the field of steel structure construction engineering, in particular to an ultra-large span overhanging prestressed arc-shaped steel beam structure and a construction method thereof.
Background
With the development of times, steel structure buildings are developing towards the directions of large span, large space, large overhang, special shape and the like. The traditional steel member is difficult to meet the building structure form with large span, large overhang and special modeling due to the limitations of the stress performance, the stability, the fatigue resistance and the like.
At present, aiming at a super-large span and large cantilever structure, the method is realized by adopting a plurality of modes of increasing the section of a component, applying a guy cable on the outer side of the structure or arranging a support at the bottom, and the like, wherein the first method for increasing the section of the component can greatly increase the steel consumption, increase the self weight of the structure, comprehensively consider the tonnage limitations of processing, transportation, hoisting and the like, and greatly increase the construction cost; the second mode of applying the guy cable on the outer side has complex construction procedures, and needs to arrange the upright post on the outer side, so the cost is high, and the attractive appearance of the building is influenced; the third type sets up the bottom sprag, except that increase engineering cost, and the most fatal has occupied building space, can not satisfy the operation requirement in building large space. Meanwhile, although the three methods meet the structural design standards in terms of strength and rigidity, the stability and fatigue resistance of the three methods are still weak points of the overall performance of the structure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an ultra-large span cantilever prestressed arc-shaped steel beam structure and a construction method thereof, and solves the problems that the strength and rigidity of a steel structure are increased by increasing the section of a component, arranging a stay cable at the outer side and arranging a support at the bottom in the prior art, the manufacturing cost is high, the occupied space is large, the attractiveness is influenced, and the stability and fatigue resistance are still weak.
The technical scheme for realizing the purpose is as follows:
the invention provides a super-large span overhanging prestressed arc-shaped steel beam structure, which comprises:
the I-beam body is arc-shaped and comprises an upper flange plate, a lower flange plate and a web plate, wherein the upper flange plate and the lower flange plate are arranged oppositely, the web plate is vertically connected between the upper flange plate and the lower flange plate, one end of the I-beam body forms an installation end part, the other end of the I-beam body forms an overhanging end part, and a bending part is formed between the installation end part and the overhanging end part of the I-beam body;
the supporting piece is fixedly arranged on the lower flange plate and corresponds to the bent part, and the top end of the supporting piece is formed on the supporting part positioned below the upper flange plate; and
one end of the prestressed stay cable is fixed on the mounting end part, the other end of the prestressed stay cable is fixed on the overhanging end part after applying the preset prestress, the prestressed stay cable corresponds to the part of the bending part, which is arranged on the supporting part, and the prestressed stay cable is arranged on two sides of the web plate.
According to the ultra-large span cantilever prestressed arc-shaped steel beam structure, the prestressed guys are arranged on the two sides of the I-shaped beam body, the overall performance of the arc-shaped steel beam structure is improved through the guys with the prestress, and when the arc-shaped steel beam structure is subjected to external vertical load, the tensioned prestressed guys can bear partial tensile force, so that the stress of the I-shaped beam body is relieved, flange plates and web plates of the I-shaped beam body are effectively protected, and the situations that the flange plates and the web plates are buckled and unstably damaged or the strength is damaged are avoided. In addition, the flexibility of the prestressed stay cable is superior to that of a steel plate, and the prestressed stay cable is supported by the supporting piece, so that the fatigue resistance and the seismic resistance of the arc-shaped steel beam structure can be effectively enhanced.
The super-large span cantilever prestressed arc-shaped steel beam structure is further improved in that the width of the web plate is gradually reduced from the bending part to the mounting end part and the cantilever end part.
The super-large span overhanging prestressed arc-shaped steel beam structure is further improved in that the direction of the prestressed stay cable is consistent with the direction of the upper flange plate.
The super-large span overhanging prestressed arc-shaped steel beam structure is further improved in that the supporting piece comprises a supporting rod vertically arranged on the lower flange plate and a supporting shaft arranged at the top of the supporting rod, the supporting shaft is perpendicular to the corresponding prestressed stay cable, and the supporting part is formed by the part of the supporting shaft, which is in contact with the prestressed stay cable.
The super-large span overhanging prestressed arc-shaped steel beam structure is further improved in that partition plates are fixedly arranged at the mounting end part and the overhanging end part, and a through hole for a prestressed inhaul cable to pass through is formed in each partition plate;
the end part of the prestressed inhaul cable penetrates through the corresponding through hole and is fixedly connected to the corresponding partition plate through the anchoring head.
The invention also provides a construction method of the ultra-large span overhanging prestressed arc-shaped steel beam structure, which comprises the following steps:
providing an arc-shaped I-shaped beam body, wherein the I-shaped beam body comprises an upper flange plate, a lower flange plate and a web plate, the upper flange plate and the lower flange plate are oppositely arranged, the web plate is vertically connected between the upper flange plate and the lower flange plate, one end of the I-shaped beam body forms an installation end part, the other end of the I-shaped beam body forms an overhanging end part, and a bending part is formed between the installation end part and the overhanging end part of the I-shaped beam body;
hoisting the I-shaped beam body to a set position, and fixedly installing the installation end part on a corresponding structure;
providing a support piece, fixedly arranging the support piece on the lower flange plate and correspondingly positioning the support piece at the bent part, wherein a support part positioned below the upper flange plate is formed at the top end of the support piece; and
the utility model provides two prestressing force cables, locate two prestressing force cables the both sides of the web of the I-beam body, and will the one end of two prestressing force cables is fixed in the installation tip of the I-beam body is to being located simultaneously the prestressing force cable of web both sides is applyed and is set for the prestressing force, and will after setting for prestressing force and applys the other end of two prestressing force cables is fixed in the tip of encorbelmenting of the I-beam body, correspond on the prestressing force cable the part of flexion is set up in corresponding on the supporting part, thereby accomplished super large span and encorbelmented the construction of prestressing force arc girder steel structure.
The construction method of the invention is further improved in that the width of the web of the provided i-beam body is gradually reduced from the bending part to the mounting end part and the overhanging end part.
The construction method is further improved in that when the prestressed inhaul cable is arranged, the direction of the prestressed inhaul cable is set to be consistent with the direction of the upper flange plate.
The construction method is further improved in that the support piece comprises a support rod and a support shaft arranged at the top of the support rod;
when the supporting piece is fixed, the bottom of the supporting rod is fixedly arranged on the lower flange plate, the supporting shaft is perpendicular to the corresponding prestressed inhaul cable, and the supporting part is formed by the part, which is in contact with the prestressed inhaul cable, of the supporting shaft.
The construction method of the invention is further improved in that the method also comprises the following steps:
providing a partition plate, fixedly arranging the partition plate on the installation end part and the overhanging end part of the I-shaped beam body, and arranging a through hole corresponding to the prestressed inhaul cable on the partition plate;
when the end part of the prestressed inhaul cable is fixed, the end part of the prestressed inhaul cable penetrates through the corresponding through hole and is fixedly connected to the corresponding partition plate through the anchoring head.
Drawings
Fig. 1 is a schematic structural view of the ultra-large span cantilever prestressed arc-shaped steel beam structure of the invention.
FIG. 2 is a side view of the end of the super large span cantilevered prestressed arc-shaped steel beam structure of the present invention.
FIG. 3 is a front view of the end of the super large span cantilevered prestressed arc-shaped steel beam structure of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the present invention provides a super large span cantilever prestressed arc-shaped steel beam structure and a construction method thereof, which is particularly suitable for large space structures with large span, large cantilever and special shapes, such as stadiums, exhibition halls, airport terminal buildings, etc. The large span and the large overhang of the invention mean a distance of more than 40 meters, and some can reach 80 meters. The steel cantilever is used for solving the problems of increasing steel consumption, being limited by self weight and operation and increasing the construction cost in the mode of enlarging the section of a component in the conventional steel cantilever structure, solving the problems of attractive appearance and high construction cost caused by additionally arranging the upright post in the mode of applying the stay cable on the outer side, and solving the problems of increasing the construction cost and occupying the building space in the mode of arranging the support at the bottom. The prestressed stay cable is arranged on the arc-shaped I-beam, so that when the arc-shaped I-beam is subjected to external load, the tensioned prestressed stay cable can bear larger load, the pressure on the web plate of the I-beam is reduced, the flange plate and the web plate of the I-beam are protected, buckling instability damage or strength damage of the flange plate and the web plate is avoided, the elasticity of the prestressed stay cable is better than that of a steel plate, and the fatigue resistance and the earthquake resistance of the arc-shaped steel beam structure can be effectively enhanced. The ultra-large span cantilever prestressed arc-shaped steel beam structure and the construction method thereof are explained below with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of the super-span cantilever prestressed arc-shaped steel beam structure of the present invention is shown. Referring to fig. 2, a side view of the super large span cantilevered prestressed arc-shaped steel beam structure end of the present invention is shown. The ultra-large span cantilever prestressed arc-shaped steel beam structure of the present invention will be described with reference to fig. 1 and 2.
As shown in fig. 1 and 2, the ultra-large span overhanging prestressed arc-shaped steel beam structure of the present invention includes an i-beam body 21, a support member 22 and a prestressed cable 23, wherein the i-beam body 21 is arc-shaped, and includes an upper flange plate 211 and a lower flange plate 212 which are oppositely disposed, and a web 213 which is vertically connected between the upper flange plate 211 and the lower flange plate 212, one end of the i-beam body 21 forms a mounting end portion 214, and the other end forms an overhanging end portion 215, and a bending portion 216 is formed between the mounting end portion 214 and the overhanging end portion 215 of the i-beam body 21; the supporting member 22 is fixedly disposed on the lower flange plate 212 and disposed corresponding to the bending portion 216, and a supporting portion located below the upper flange plate 211 is formed at the top end of the supporting member 22; one end of the prestressed cable 23 is fixed to the mounting end portion 214, and the other end is fixed to the overhanging end portion 215 while applying a predetermined prestress thickness to the prestressed cable 23, so that a portion of the prestressed cable 23 between the overhanging end portion 215 and the mounting end portion 214 is in a tensioned state, and the prestressed cable 23 is provided on both sides of the web 213. Preferably, when the prestress is applied to the prestress stay cable, the prestress is applied to the prestress stay cable by using the hydraulic prestress pulling jack, and when the applied prestress reaches the design requirement, the end part of the prestress stay cable is fixed.
When the arc-shaped steel beam structure is installed, the installation end part 214 of the I-beam body 21 is fixed on a corresponding structure, and the overhanging end part 215 of the I-beam body 21 is in an overhanging state. In the mounted state, the upper flange plate 211 and the lower flange plate 212 of the i-beam body 21 are arranged vertically opposite to each other, and the web 213 is arranged vertically. When the length of the i-beam 21 is large, if the overhanging end 215 is loaded, the mounting end 214 is subjected to a large bending moment, and the bending moment load of the bending part is also large, so that buckling instability damage or direct strength damage is easily caused. In order to solve the problem, the invention provides two prestressed guy cables 23 which are arranged on two sides of the web plate 213 in a tensioning manner, and through the arrangement of the prestressed guy cables 23, when the end part of the I-shaped beam body 21 is loaded, the prestressed guy cables 23 can bear part of the load, so that the load required to be borne by the I-shaped beam body 21 is reduced, the I-shaped beam body 21 is effectively protected, and the situations of buckling instability damage or strength damage of the flange plate and the web plate are avoided. In addition, the flexibility of the prestressed stay cable is superior to that of a steel plate, and the prestressed stay cable is supported by the supporting piece, so that the fatigue resistance and the seismic resistance of the arc-shaped steel beam structure can be effectively enhanced.
Preferably, the prestressed cables 23 are symmetrically arranged on both sides of the web 213, and the prestressed cables 23 are arranged corresponding to the upper portion of the web 213, i.e. the prestressed cables 23 are arranged near the upper flange plate 211.
In a preferred embodiment of the present invention, the width of the web 213 is gradually reduced from the bent portion 216 to the mounting end portion 214 and the overhanging end portion 215. The web 213 has a width gradually changing structure, and has a maximum width at the bent portion 216 and a minimum width at the end of the mounting end portion 214 and the overhanging end portion 215. That is, the i-beam body 21 has a variable cross-section structure as a whole, and has a small cross-section at both ends and a largest cross-section at a bent part.
Because the bending part 216 of the i-beam body 21 bears a large bending moment load when one end of the i-beam body is stressed, the width of the bending part 216 is set to be the largest, so that the structural strength of the bending part 216 can be improved to bear a large bending moment load, and the structural stability is ensured.
As another preferred embodiment of the present invention, the prestressed stay 23 is oriented to correspond to the upper flange plate 211. So that the arc shape of the prestressing lock 23 is adapted to the arc shape of the upper flange plate 211 of the i-beam body 21.
Specifically, the arc shape of the prestressed stay 23 is adjusted to be in conformity with the orientation of the upper flange plate 211 by setting the position of the stay 22. In the example shown in fig. 1, three support members 22 are provided, and are fixed to the lower flange plate 212 of the i-beam body 21 at intervals.
The support member 22 includes a support rod 221 erected on the lower flange plate 212 and a support shaft 222 arranged on the top of the support rod 221, the support shaft 222 is perpendicular to the corresponding prestressed tension cable 23, and the portion of the support shaft contacting the prestressed tension cable 23 forms a support portion.
In order to improve the stability of the supporting member 22, first ribbed plates 223 are disposed on two sides of the strut pair 21, and are fixedly disposed on the lower flange plate 212 and fixedly connected to the strut 21. The first ribbed plate is preferably a triangular plate.
The support shaft 222 is disposed perpendicular to the web 213, and preferably, the support shaft 222 abuts against the web 213.
Preferably, the outer surface of the support shaft 222 is coated with lubricating grease, the pre-stressed cable 23 can slide by using the coated lubricating grease, the lubricating grease has a lubricating effect, the sliding of the pre-stressed cable 23 is facilitated, and the limitation or obstruction to the telescopic performance of the pre-stressed cable 23 is avoided.
As another preferred embodiment of the present invention, as shown in fig. 1 to 3, the mounting end 214 and the overhanging end 215 are both fixedly provided with a partition plate 25, and the partition plate 25 is provided with a through hole for the prestressed cable 23 to pass through;
the ends of the prestressed cables 23 pass through the corresponding through holes and are fastened to the corresponding spacers 25 by means of the anchoring heads 24.
Preferably, the partition 25 is connected vertically to the web 213, and also connected vertically to the upper flange plate 211 and the lower flange plate 212.
In order to improve the stability of the partition 25, the second rib 251 is disposed on two sides of the partition 25, and the second rib 251 is supported and connected between the lower flange plate 212 and the partition 25. The second ribbed plate is preferably a triangular plate.
The working principle of the ultra-large span cantilever prestressed arc-shaped steel beam structure provided by the invention is explained below.
The overhanging end part of the ultra-large span overhanging prestressed arc-shaped steel beam structure is in an overhanging state and can be generally subjected to vertical load. When the end part of the cantilever is subjected to vertical load, the bending part of the I-shaped beam body bears large bending moment load, buckling instability damage or direct strength damage is easy to occur, the arc-shaped steel beam structure is used as a main stress component, and the serious consequence of overall collapse of the structure can be caused if the structure is damaged. When the overhanging end part of the I-beam body is stressed, the upper flange plate is subjected to large tensile force, and the web plate is subjected to large pressure, so that after the prestressed stay cable is arranged, the prestressed stay cable can bear the large pressure on the web plate, the pressure on the web plate is reduced, the prestressed stay cable effectively protects the upper flange plate and the web plate, and buckling instability damage or strength damage is avoided. Because the prestressed stay cable is better than the steel plate in elasticity, and is provided with support piece, the fatigue resistance and the anti-seismic performance of arc girder steel structure have effectively been strengthened.
The construction method of the ultra-large span cantilever prestressed arc-shaped steel beam structure provided by the invention is explained below.
The invention provides a construction method of a super-large span cantilever prestressed arc-shaped steel beam structure, which comprises the following steps:
as shown in fig. 1, an i-beam body 21 having an arc shape is provided, the i-beam body 21 includes an upper flange plate 211 and a lower flange plate 212 which are oppositely arranged, and a web 213 which is vertically connected between the upper flange plate 211 and the lower flange plate 212, one end of the i-beam body 21 forms a mounting end portion 214, the other end forms an overhanging end portion 215, and a bending portion 216 is formed between the mounting end portion 214 and the overhanging end portion 215 of the i-beam body 21;
hoisting the I-beam body 21 to a set position, and fixedly installing the installation end part 214 on a corresponding structure;
providing a support member 22, fixing the support member 22 on the lower flange plate 212 and correspondingly locating at the bent portion 216, wherein a support portion located below the upper flange plate 211 is formed at the top end of the support member 22; and
providing two prestressed cables 23, arranging the two prestressed cables 23 at two sides of a web plate 213 of the I-beam body 21, fixing one ends of the two prestressed cables 23 at an installation end part 214 of the I-beam body 21, applying a preset prestress to the prestressed cables 23 at two sides of the web plate 213, fixing the other ends of the two prestressed cables 23 at an overhanging end part 215 of the I-beam body 21 after applying the preset prestress, and erecting the part, corresponding to the bending part 216, of the prestressed cables 23 on a corresponding supporting part, thereby completing the construction of the ultra-large span overhanging prestressed arc-shaped steel beam structure.
Preferably, the prestressed cables 23 are symmetrically arranged on both sides of the web 213, and the prestressed cables 23 are arranged corresponding to the upper portion of the web 213, i.e. the prestressed cables 23 are arranged near the upper flange plate 211.
In a preferred embodiment of the present invention, the web 213 of the i-beam body 21 is provided with a width gradually decreasing from the bent portion 216 to the mounting end portion 214 and the overhanging end portion 215.
Specifically, the i-beam body 21 has a variable cross-section structure as a whole, and has a small cross-section at both ends and a largest cross-section at a bent portion. Because the bending part 216 of the i-beam body 21 bears a large bending moment load when one end of the i-beam body is stressed, the width of the bending part 216 is set to be the largest, so that the structural strength of the bending part 216 can be improved to bear a large bending moment load, and the structural stability is ensured.
As another preferred embodiment of the present invention, when the prestressed stay 23 is provided, the orientation of the prestressed stay 23 is set to coincide with the orientation of the upper flange plate 211. Specifically, the arc shape of the prestressed stay 23 is adjusted to be in conformity with the orientation of the upper flange plate 211 by setting the position of the stay 22. In the example shown in fig. 1, three support members 22 are provided, and are fixed to the lower flange plate 212 of the i-beam body 21 at intervals.
As another preferred embodiment of the present invention, there is provided a supporting member 22 including a supporting rod 221 and a supporting shaft 222 provided on the top of the supporting rod 221;
when the supporting member 22 is fixed, the bottom of the supporting rod 221 is fixed on the lower flange plate 212, the supporting shaft 222 is perpendicular to the corresponding prestressed cable 23, and the portion of the supporting shaft 222 contacting with the prestressed cable 23 forms a supporting portion.
In order to improve the stability of the supporting member 22, first ribbed plates 223 are disposed on two sides of the strut pair 21, and are fixedly disposed on the lower flange plate 212 and fixedly connected to the strut 21. The first ribbed plate is preferably a triangular plate.
The support shaft 222 is disposed perpendicular to the web 213, and preferably, the support shaft 222 abuts against the web 213.
Preferably, the outer surface of the support shaft 222 is coated with lubricating grease, the pre-stressed cable 23 can slide by using the coated lubricating grease, the lubricating grease has a lubricating effect, the sliding of the pre-stressed cable 23 is facilitated, and the limitation or obstruction to the telescopic performance of the pre-stressed cable 23 is avoided.
As another preferred embodiment of the present invention, the present invention further includes:
providing a partition plate 25, fixedly arranging the partition plate 25 on the mounting end part 214 and the overhanging end part 215 of the I-beam body 21, and arranging a through hole corresponding to the prestressed inhaul cable 23 on the partition plate 25;
when the end of the prestressed cable 23 is fixed, the end of the prestressed cable 23 is passed through the corresponding through hole and is fastened to the corresponding spacer 25 by the anchor head 24. In order to improve the stability of the partition 25, the second rib 251 is disposed on two sides of the partition 25, and the second rib 251 is supported and connected between the lower flange plate 212 and the partition 25. The second ribbed plate is preferably a triangular plate.
The ultra-large span cantilever prestress arc-shaped steel beam structure and the construction method thereof have the beneficial effects that:
the prestressed arc-shaped steel beam has reasonable stress and high bearing capacity, can reduce the section size of a member and save the steel consumption;
this prestressing force arc girder steel structure construction convenient and fast, it is efficient, removed outside cable or inside support setting from, effectively saved manpower and material resources, saved construction cost.
The prestressed arc-shaped steel beam is simple in structure and convenient to process;
the prestressed arc-shaped steel beam is good in structural stability, fatigue resistance and earthquake resistance, and the overall safety of the structure is greatly enhanced.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (6)
1. The utility model provides a super large span prestressing force arc girder steel structure of encorbelmenting which characterized in that includes:
the I-beam body is arc-shaped and comprises an upper flange plate, a lower flange plate and a web plate, wherein the upper flange plate and the lower flange plate are arranged oppositely, the web plate is vertically connected between the upper flange plate and the lower flange plate, one end of the I-beam body forms an installation end part, the other end of the I-beam body forms an overhanging end part, and a bending part is formed between the installation end part and the overhanging end part of the I-beam body;
the supporting piece is fixedly arranged on the lower flange plate and corresponds to the bent part, and a supporting part positioned below the upper flange plate is formed at the top end of the supporting piece; and
one end of the prestressed guy cable is fixed on the mounting end part, the other end of the prestressed guy cable is fixed on the overhanging end part after a preset prestress is applied to the prestressed guy cable, the part of the prestressed guy cable corresponding to the bending part is erected on the supporting part, and the prestressed guy cable is arranged on two sides of the web plate;
the supporting piece comprises a supporting rod vertically arranged on the lower flange plate and a supporting shaft arranged at the top of the supporting rod, the supporting shaft is perpendicular to the corresponding prestressed inhaul cable, the supporting part is formed by the part, in contact with the prestressed inhaul cable, of the supporting shaft, and lubricating grease is coated on the surface of the supporting shaft;
the prestressed stay cable is close to the upper flange plate, and the trend of the prestressed stay cable is consistent with that of the upper flange plate.
2. The super span cantilevered prestressed arcuate steel beam structure of claim 1, wherein said web tapers in width from said bight portion to said mounting end portion and said cantilevered end portion.
3. The ultra-large span cantilever prestressed arc-shaped steel beam structure of claim 1, wherein partition plates are fixedly arranged at the mounting end part and the cantilever end part, and a through hole for a prestressed stay cable to pass through is formed in each partition plate;
the end part of the prestressed inhaul cable penetrates through the corresponding through hole and is fixedly connected to the corresponding partition plate through the anchoring head.
4. A construction method of a super-large span cantilever prestress arc-shaped steel beam structure is characterized by comprising the following steps:
providing an arc-shaped I-shaped beam body, wherein the I-shaped beam body comprises an upper flange plate, a lower flange plate and a web plate, the upper flange plate and the lower flange plate are oppositely arranged, the web plate is vertically connected between the upper flange plate and the lower flange plate, one end of the I-shaped beam body forms an installation end part, the other end of the I-shaped beam body forms an overhanging end part, and a bending part is formed between the installation end part and the overhanging end part of the I-shaped beam body;
hoisting the I-shaped beam body to a set position, and fixedly installing the installation end part on a corresponding structure;
providing a support piece, fixedly arranging the support piece on the lower flange plate and correspondingly positioning the support piece at the bent part, wherein a support part positioned below the upper flange plate is formed at the top end of the support piece; and
providing two prestressed inhaul cables, arranging the two prestressed inhaul cables at two sides of a web plate of the I-shaped beam body, fixing one ends of the two prestressed inhaul cables at the installation end part of the I-shaped beam body, applying preset prestress to the prestressed inhaul cables at two sides of the web plate, fixing the other ends of the two prestressed inhaul cables at the overhanging end part of the I-shaped beam body after applying the preset prestress, and erecting the parts, corresponding to the bent parts, of the prestressed inhaul cables on the corresponding supporting parts, so that the construction of the ultra-large span overhanging prestressed arc-shaped steel beam structure is completed;
the provided supporting piece comprises a supporting rod and a supporting shaft arranged at the top of the supporting rod;
when the supporting piece is fixed, the bottom of the supporting rod is fixedly arranged on the lower flange plate, the supporting shaft is perpendicular to the corresponding prestressed inhaul cable, the supporting part is formed on the part, which is in contact with the prestressed inhaul cable, of the supporting shaft, and lubricating grease is coated on the surface of the supporting shaft;
the prestressed stay cable is arranged close to the upper flange plate, and the trend of the prestressed stay cable is set to be consistent with that of the upper flange plate.
5. The construction method according to claim 4, wherein the web of the I-beam body is provided so as to have a width gradually decreasing from the bent portion toward the installation end portion and the cantilever end portion.
6. The construction method according to claim 4, further comprising:
providing a partition plate, fixedly arranging the partition plate on the installation end part and the overhanging end part of the I-shaped beam body, and arranging a through hole corresponding to the prestressed inhaul cable on the partition plate;
when the end part of the prestressed inhaul cable is fixed, the end part of the prestressed inhaul cable penetrates through the corresponding through hole and is fixedly connected to the corresponding partition plate through the anchoring head.
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| CN110805261A (en) * | 2019-11-09 | 2020-02-18 | 上海建工集团股份有限公司 | Steel platform steel beam structure based on prestress reinforcement and construction method |
| CN112443043B (en) * | 2020-11-25 | 2022-02-22 | 浙大城市学院 | Multilayer through-height large-space cantilever truss structure with embedded small orthotropic truss and application |
| CN116025095B (en) * | 2023-03-31 | 2023-06-20 | 北京市建筑工程研究院有限责任公司 | Cable-beam composite long-span cable-support arch shell and construction method thereof |
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| CN201794196U (en) * | 2010-05-21 | 2011-04-13 | 舒华 | Arched corrugated steel roof with increased service span |
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| KR100714662B1 (en) * | 2006-04-06 | 2007-05-04 | 박문식 | Cantilever of h type beam narrowed from the front to the end |
| CN202039510U (en) * | 2011-04-11 | 2011-11-16 | 山东锦城钢结构有限责任公司 | Skylight with arc steel structure |
| CN102296751B (en) * | 2011-06-01 | 2013-03-20 | 马人乐 | Prestressing anti-fatigue girder |
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| CN102758499B (en) * | 2012-07-05 | 2015-01-07 | 北京工业大学 | Precast prestressed steel girder with post-seismic restorable function |
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| CN1335439A (en) * | 2000-07-20 | 2002-02-13 | 胡战波 | Prestressed large-span solid portal steel frame and its construction process |
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