CN112095779A - Prestressed truss end base structure and construction method - Google Patents
Prestressed truss end base structure and construction method Download PDFInfo
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- CN112095779A CN112095779A CN202010851111.9A CN202010851111A CN112095779A CN 112095779 A CN112095779 A CN 112095779A CN 202010851111 A CN202010851111 A CN 202010851111A CN 112095779 A CN112095779 A CN 112095779A
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- lower chord
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H6/00—Buildings for parking cars, rolling-stock, aircraft, vessels or like vehicles, e.g. garages
- E04H6/44—Buildings for parking cars, rolling-stock, aircraft, vessels or like vehicles, e.g. garages for storing aircraft
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1996—Tensile-integrity structures, i.e. structures comprising compression struts connected through flexible tension members, e.g. cables
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Abstract
The invention relates to a prestressed truss end base structure, comprising: the base is arranged at the top of the corresponding concrete support column in the vertical direction; the connecting pieces are horizontally arranged on the corresponding bases, the first ends of the connecting pieces are fixedly connected with the corresponding end parts of the lower chords, the second ends of the connecting pieces are fixedly connected with the corresponding bases, the sizes of the first ends are smaller than those of the second ends, gradual change connecting parts are formed, and the connecting pieces are hollow; the stress mechanism penetrates through the connecting piece at one end of the lower chord and penetrates out of the connecting piece at the other end of the lower chord, and the end part of the stress mechanism is positioned on the outer side of the corresponding connecting piece; and the anchoring mechanism is arranged in the connecting piece, one end part of the stress mechanism is anchored through the anchoring mechanism, and the other end part of the stress mechanism is anchored through the anchoring mechanism after the other end part of the stress mechanism is tensioned to apply prestress.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a base structure of an end part of a prestressed truss and a construction method.
Background
At present, the end base structure of trusses on two sides of the existing designed hangar gate cannot meet the requirement of tensioning construction of prestressed steel strands, wherein the existing design adopts a full-length prestressed steel pipe, the diameter of the prestressed steel pipe is small, the force transmission path of an anchorage device on the end part is unfavorable for the structure, and the steel strands cannot be effectively tensioned and anchored. In view of the above, there is a need for a structure that can ensure both pre-stressed tension and anchoring force of the tensioned structure when concrete is poured.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a base structure at the end part of a hangar prestressed truss, compared with the traditional mode, the base structure changes a long steel pipe into a gradual change type steel pipe with different diameters, provides a larger space for the tension force transmission of a steel strand through the diameter of the end part of the method, simultaneously increases stiffening ribs to further optimize the force transmission path, arranges a plurality of anchoring plates and pre-stressed holes at the positions with different diameters of the gradual change type steel pipe, ensures that the steel strand tensioned after receiving prestress is not easy to move, and is provided with vent holes corresponding to the anchoring plates, so that air is better exhausted when concrete is poured, the pouring is more compact, the anchoring force is ensured to be stronger, and further the quality hidden danger is eliminated.
The technical scheme for realizing the purpose is as follows:
a prestressed truss end base structure for tensioning and anchoring a lower chord between a pair of oppositely disposed concrete support columns at the bottom of a truss, the base structure comprising:
the base is arranged at the top of the corresponding concrete support column in the vertical direction;
the connecting pieces are horizontally arranged on the corresponding bases, the first ends of the connecting pieces are fixedly connected with the corresponding end parts of the lower chords, the second ends of the connecting pieces are fixedly connected with the corresponding bases, the sizes of the first ends are smaller than those of the second ends, gradual change connecting parts are formed, and the connecting pieces are hollow;
the stress mechanism penetrates through the connecting piece at one end of the lower chord and penetrates out of the connecting piece at the other end of the lower chord, and the end part of the stress mechanism is positioned on the outer side of the corresponding connecting piece; and
the anchoring mechanism is arranged in the connecting piece, one end part of the stress mechanism is anchored through the anchoring mechanism, and the other end part of the stress mechanism is anchored through the anchoring mechanism after the other end part of the stress mechanism is tensioned to apply prestress.
The invention further discloses a further improvement of the end base structure of the prestressed truss, wherein the second end of the connecting piece penetrates through the lower chord ball and is partially positioned outside the lower chord ball, the anchoring mechanism is partially connected with the outer surface of the connecting piece and is fixedly connected with the lower chord ball, and the lower chord ball is fixedly connected with the upper chord of the truss and the outermost truss.
The invention further provides a further improvement of the base structure at the end part of the prestressed truss, wherein the anchoring mechanism comprises an anchor backing plate and stiffening ribs, the anchor backing plate is covered at the second end of the connecting piece, the stiffening ribs are provided with three stiffening ribs, one ends of the stiffening ribs are mutually spliced in the corresponding connecting piece, the other ends of the stiffening ribs extend out of the outer surface of the corresponding connecting piece and are fixedly connected with the lower chord ball, the stiffening ribs are arranged at the opening parts of the corresponding connecting pieces, and the stiffening ribs are fixedly connected with the anchor backing plate.
The invention further provides a further improvement of the base structure at the end part of the prestressed truss, wherein the anchoring mechanism further comprises a first anchoring plate, a second anchoring plate, a third anchoring plate and a fourth anchoring plate which are arranged on the inner wall of the lower chord, the first anchoring plate is arranged in the lower chord and is far away from the gradual change joint, the second anchoring plate is arranged in the lower chord and is close to the gradual change joint, the third anchoring plate is arranged in the first end of the connecting piece and has the same size with the second anchoring plate, and the fourth anchoring plate is arranged in the connecting piece and is arranged at the gradual change joint and has the same size with the second end;
the first anchor plate, the second anchor plate third anchor plate with the fourth anchor plate is equipped with three prestressed hole, stress mechanism penetrates the connecting piece that is located a lower chord one end department and passes the correspondence again prestressed hole, and penetrates the lower chord is worn out simultaneously the lower chord other end corresponds prestressed hole, and then stretches out the connecting piece that is located another end department of lower chord to realize both ends stretch-draw.
The invention further improves a base structure at the end part of a prestressed truss, wherein a stress mechanism comprises three steel strands, a protective cover and sleeves, the sleeves are arranged in the lower chord in a penetrating manner, the steel strands are divided into three parts and correspondingly penetrate into the three sleeves along one end of the lower chord, the prestress holes of the first anchoring plate, the second anchoring plate and the third anchoring plate are correspondingly sleeved into the sleeves and sequentially arranged in the lower chord, the steel strands and the sleeves extend out of the other end of the lower chord and are sequentially sleeved into the first anchoring plate, the second anchoring plate and the third anchoring plate corresponding to the prestress holes;
the protective cover is buckled at the second end and a cavity is formed in the protective cover.
The invention further improves the structure of the base at the end part of the prestressed truss, wherein grouting holes are formed in the surface, corresponding to the fourth anchoring plates, of the connecting piece, the fourth anchoring plates are arranged in pairs, the grouting holes are arranged between the adjacent fourth anchoring plates, and exhaust holes are formed in the surface, corresponding to the connecting piece, of the fourth anchoring plates and the stiffening ribs.
The base structure of the end part of the prestressed truss is further improved in that the anchoring mechanism further comprises a concrete structure formed by pouring, and the concrete structure is respectively poured between the adjacent fourth anchoring plates, the anchor backing plates in the protective cover and the connecting piece from the fourth anchoring plates.
The invention also provides a construction method of the foundation structure at the end part of the hangar prestressed truss, which is used for tensioning and anchoring the lower chord between a pair of oppositely arranged concrete support columns at the bottom of the truss, and comprises the following steps:
providing a base, placing the base on the tops of the oppositely arranged concrete support columns, wherein the base comprises a lower chord ball, and placing the lower chord ball on the top of the base and fixedly connecting the lower chord ball with an outermost truss and an upper chord of the truss;
providing a connecting piece, wherein the size of a second end of the connecting piece is larger than that of a first end, a gradual change connecting part is formed at the splicing connecting part of the second end and the first end, and the first end of the connecting piece penetrates through the corresponding lower chord ball and is connected with the end part corresponding to the lower chord;
providing a stress mechanism, wherein the stress mechanism penetrates into the connecting piece at one end part of the lower chord and penetrates out of the connecting piece at the other end part of the lower chord through the lower chord;
and providing an anchoring mechanism, anchoring one end part of the stress mechanism by using the anchoring mechanism, tensioning the other end part of the stress mechanism and applying prestress, and anchoring the other end part of the stress mechanism by using the anchoring mechanism, thereby completing the construction of the base structure at the end part of the prestressed truss.
The construction method is further improved in that the provided anchoring mechanism comprises a stiffening rib, an anchor backing plate, a first anchoring plate, a second anchoring plate, a third anchoring plate and a fourth anchoring plate;
correspondingly arranging trisected prestressed holes in the first anchoring plate, the second anchoring plate, the third anchoring plate and the fourth anchoring plate, sequentially inserting the first anchoring plate, the second anchoring plate and the third anchoring plate into the lower chord and sleeving the stress mechanism through the prestressed holes, and inserting a pair of fourth anchoring plates into the inner wall of the opposite connecting piece;
arranging a grouting hole on the upper surface of the connecting piece corresponding to the fourth anchoring plate, arranging an exhaust hole between the connecting piece corresponding to the fourth anchoring plate and the second end of the connecting piece, grouting into the grouting hole, extruding air into the part, close to the second end, of the fourth anchoring plate through the prestress hole of the fourth anchoring plate, exhausting the air through the exhaust hole, and grouting to form a concrete structure so as to anchor a corresponding stress mechanism;
anchoring the end part of the stress mechanism to the second end and providing stiffening ribs, uniformly distributing and splicing the stiffening ribs in the connecting piece in a trisection manner, and extending the other ends of the stiffening ribs out of the upper surface of the connecting piece and fixedly connecting the other ends of the stiffening ribs with the lower chord ball; covering the anchor backing plate at the second end of the connecting piece;
and another grouting hole is formed in the upper surface of the stiffening rib corresponding to the connecting piece, and grouting is performed on the corresponding part between the end part of the stress mechanism and the fourth anchoring plate so as to further anchor the stress mechanism.
The construction method of the invention is further improved in that the construction method further comprises the following steps:
and a protective cover is arranged at the second end of the connecting piece in a buckled mode, and a grouting hole is formed above the protective cover and is used for grouting and forming the grouting hole to anchor the end part of the stress mechanism.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: 1. the size of the first end of the connecting piece is smaller than that of the second end of the connecting piece, and the connecting pieces are spliced with each other to form a gradual-change connecting piece, so that the inner space of one end, located at the lower string ball, of the connecting piece is increased, and the requirement of installation space is met. 2. Through setting up anchor backing plate in the second end of connecting piece and fixed connection and add and establish stiffening rib and stiffening rib equipartition setting and stretch out the surface of connecting piece, stiffening rib has changed the inside power transmission route of connecting piece, the prestressing force of having changed the original design transmits the steel pipe for through the ground tackle, the steel pipe redisperses the route of whole steel pipe with pressure for prestressing force after the stretch-draw passes anchor backing plate through the ground tackle, the rethread stiffening rib directly transmits pressure for the lower chord ball, the adverse effect that prestressing force transmission route produced the structure after having solved steel strand wires stretch-draw has accurately realized the design intention. 3. Increase the restrictive force to the sleeve pipe through the inside method that sets up the anchor board of a plurality of different specifications of connecting piece that corresponds the gradual change formula, including first anchor board, the second anchor board, third anchor board and fourth anchor board, first anchor board sets up in the lower chord member of keeping away from the second end of connecting piece, the second anchor board sets up in the part that first anchor board is close to the second end, third anchor board sets up before the sleeve pipe tip finishes and for the design of two baffles, the fourth anchor board sets up in the horn mouth both sides after the gradual change, two baffle intervals 40 ~ 80mm are suitable, the sleeve pipe is effectively solved in this construction way and is located the restrictive force not enough at the base, poor stability's difficult problem. 4. And (3) through analyzing and researching the grouting construction process in the connecting piece, arranging an exhaust hole and a grouting hole at the top of the connecting piece of the base section, and pouring adjacent fourth anchoring plates to form a sealed cabin. The sealed cabin is the grout hole that the fourth anchor board that two intervals set up corresponds rather than the clearance top form, at first with the mortar to the sealed cabin fill closely during the construction, it is not closely knit to leak the thick liquid when preventing follow-up having bonding prestressing force section grout. The gas in the pipe can be discharged through the exhaust holes arranged at the top when grouting, and the gaps of the stranded wires in the connecting piece are fully and compactly grouted. The method effectively solves the problems that the grouting quality is not easy to control in the original designed grouting structure and mode, and the like. The improved mode better meets the construction requirements and better realizes the original design purpose.
Drawings
FIG. 1 is a schematic diagram of a relationship between a truss and a base of a base structure at an end of a prestressed truss according to the present invention;
FIG. 2 is a schematic structural view of a base structure of an end of a prestressed truss according to the present invention;
FIG. 3 is a partial schematic view of a pre-stressed truss end mount configuration of the present invention;
FIG. 4 is a schematic view of the installation of a first anchoring plate of the base structure at the end of a prestressed truss according to the present invention;
FIG. 5 is a schematic view of the installation of a second anchoring plate of the base structure at the end of the prestressed truss according to the present invention;
FIG. 6 is a schematic view of the installation of a third anchoring plate of the base structure at the end of the prestressed truss according to the present invention;
fig. 7 is a schematic view of the installation of a fourth anchoring plate of the base structure at the end of the prestressed truss according to the present invention.
Description of reference numerals:
20. a base; 21. a lower string ball; 23. a connecting member; 24. a lower chord; 25. an anchor backing plate; 26. a stiffening rib; 30. a stress mechanism; 31. a steel wire rope; 32. a protective cover; 33. a sleeve; 40. an anchoring mechanism; 41. a first anchor plate; 42. a second anchor plate; 43. a third anchor plate; 44. a fourth anchor plate; 45. a pre-stressed hole; 50. grouting holes; 51. an exhaust hole; 52. grouting holes; 60. a truss; 61. an outermost truss; 62. concrete support column, 63, upper chord.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention is described in further detail below with reference to the figures and specific embodiments. It is characterized by comprising:
as shown in fig. 1 and 2, the base structure of the prestressed truss end of the present invention is a base structure for tensioning and anchoring a lower chord between a pair of concrete support columns oppositely disposed at the bottom of a truss, the base structure including:
the base 20 is vertically arranged at the top of the corresponding concrete support column 62;
the connecting pieces 23 are horizontally arranged on the corresponding base 20, the first ends of the connecting pieces 23 are fixedly connected with the corresponding end parts of the lower chords 24, the second ends of the connecting pieces 23 are fixedly connected with the corresponding base 20, the size of the first ends is smaller than that of the second ends, gradual change connecting parts are formed, and the connecting pieces 23 are hollow;
a stress mechanism 30 penetrating in from the connecting member 23 at one end of the lower chord 24 and penetrating out from the connecting member 23 at the other end of the lower chord 24, the end of the stress mechanism 30 being located outside the corresponding connecting member 23; and
the anchoring mechanism 40 provided in the link 23 anchors one end portion of the stress mechanism 30 by the anchoring mechanism 40, and anchors the other end portion of the stress mechanism 30 by the anchoring mechanism 40 after the other end portion of the stress mechanism 30 is prestressed by being tensioned.
The base structure of the invention is provided with a base which is positioned at the top of a concrete supporting column which is oppositely arranged, a connecting piece is fixedly connected on the oppositely arranged base in the horizontal direction, the first end of the connecting piece is fixedly connected with the two ends of a lower chord at the bottom of a truss, the first end is fixedly connected with the lower chord of the truss and has the same size with the lower chord, the second end is fixedly connected with the base, the size of the second end is larger than that of the first end, a gradual change connecting part is formed at the connecting part with the first end, the connecting piece is hollow and is penetrated with a stress mechanism, one end of the stress mechanism penetrates through the connecting piece and extends into the lower chord, penetrates out through the lower chord and penetrates out of the connecting piece of, the connecting pieces corresponding to the two end parts of the lower chord are also provided with anchoring mechanisms, prestress is applied to the stress mechanisms, and the positions in the corresponding connecting pieces where the stress mechanisms are located are sequentially anchored, so that the lower chord is tensioned and anchored. The invention is applied to the detailed structure of the end part of the lower chord in the actual construction stage, the end part of the lower chord is deeply designed and constructed to meet the construction requirement, the structure is uniform, safe and reliable in stress, good in tensioning effect, less prone to shifting of a stress mechanism after anchoring, cost-saving, higher in construction efficiency and quality, practical and reusable.
As shown in fig. 2 and 3, in the end base structure of the prestressed truss according to the present invention, the second end of the connecting member 23 penetrates the lower chord 21 and is partially located outside the lower chord 21, the anchoring mechanism 40 is partially connected to the outer surface of the connecting member 23 and is fixedly connected to the lower chord 21, and the lower chord 21 is fixedly connected to the upper chord 63 of the truss 60 and the outermost truss 61.
Specifically, the lower chord 21 is welded and fixed on the top of the base 20, the first end of the connecting member 23 penetrates into the lower chord 21 in the horizontal direction and is fixedly connected with one end of the lower chord 24, the upper chord 63 and the outermost truss 61 of the truss 60 are positioned above and at the side of the lower chord 21 and are welded and fixed with the lower chord 12, the function of supporting connection is further achieved, the anchoring mechanism 40 partially extends out of the second end of the connecting member 23 and is fixedly connected with the lower chord 21, and the anchoring force of the connecting member 23 and the tensile force of the stress mechanism 30 are further enhanced and reinforced.
As shown in fig. 2 and 3, the anchoring mechanism 40 of the prestressed truss end base structure of the present invention includes an anchor backing plate 25 and a stiffening rib 26, the anchor backing plate 25 covers the second end of the connecting member 23, the stiffening rib 26 has three ends, one end of each stiffening rib is spliced with the corresponding connecting member 23, the other end of each stiffening rib 26 extends out of the outer surface of the corresponding connecting member 23 and is fixedly connected with the lower bowstring 21, the stiffening rib 26 is disposed at the mouth of the corresponding connecting member 23, and the stiffening rib 26 is fixedly connected with the anchor backing plate 25.
Specifically, the anchor backing plate 25 covers the second end of the connecting member 23, the corresponding connecting member 23 is internally spliced with three stiffening ribs 26, one end of each stiffening rib 26 is spliced inside the corresponding connecting member 23, and the included angle between each adjacent stiffening rib 26 is equally trisected to form a trisection, one end of each stiffening rib 26 is spliced inside the corresponding connecting member 23, the other end of each stiffening rib penetrates through the inner wall of the corresponding connecting member 23 and is fixedly connected with the lower chord ball 21, the side part of the stiffening rib 26 close to the anchor backing plate 25 is welded and fixed with the anchor backing plate 25 to form a whole, the trisection mode is adopted to evenly transmit the received prestress to the inner wall of the connecting member 23 and further to the lower chord ball 21 along the stiffening rib 26, and the condition that the traditional force transmission path is not uniform is changed, the prestressed force after being tensioned is transmitted to the anchor backing plate 25, and the pressure is directly transmitted to the lower chord ball 21 through the stiffening ribs 26, so that the adverse effect of the prestressed force transmission path after being tensioned by the stress mechanism 30 on the structure is solved.
As shown in fig. 4 and 7, the anchoring mechanism 40 of the invention further includes a first anchoring plate 41, a second anchoring plate 42, a third anchoring plate 43 and a fourth anchoring plate 44 disposed on the inner wall of the lower chord 24, wherein the first anchoring plate 41 is disposed in the lower chord 24 and away from the gradual-change connection, the second anchoring plate 42 is disposed in the lower chord 24 and close to the gradual-change connection, the third anchoring plate 43 is disposed in the first end of the connecting member 23 and has a size consistent with that of the second anchoring plate 42, and the fourth anchoring plate 44 is disposed in the connecting member 23 and is disposed at the gradual-change connection and has a size consistent with that of the second end;
as shown in fig. 4 and 5, the first anchor plate 41, the second anchor plate 42, the third anchor plate 43 and the fourth anchor plate 44 are provided with three prestressed holes 45, and the stress mechanism 30 penetrates the connecting member 23 at one end of the lower chord 24, then penetrates the corresponding prestressed hole 45, penetrates the lower chord 24 while penetrating the corresponding prestressed hole 45 at the other end of the lower chord 24, and then extends out of the connecting member 23 at the other end of the lower chord 24 to realize two-end tensioning.
As shown in fig. 1 and fig. 2, specifically, the second end of the connecting member 23 is larger than the first end, a bell mouth is provided at the joint of the second end and the first end, the end with the smaller bell mouth size is the first end and is fixedly connected with the end of the lower chord 24, the end with the larger bell mouth size is the second end and is fixedly connected with the lower chord 21, and the inner wall of the welding part of the end of the lower chord 24 and the bell mouth is thinner than the thickness of the inner wall of the lower chord 21 itself;
as shown in fig. 2, the first anchoring plate 41, the second anchoring plate 42 and the third anchoring plate 43 are arranged in the lower chord 24, the first anchoring plate 41 is perpendicularly connected with the inner wall of the lower chord 24 and is far away from the second end, preferably, the diameter of the lower chord is 500mm, and the thickness of the inner wall is 40 mm. Preferably, the first anchor plate has a thickness of 20 mm. As shown in fig. 2 and 5, the second anchoring plate 42 is vertically connected to the inner wall of the lower chord 24 and anchored to the inner wall of the lower chord 24 and placed behind the first anchoring plate 41, and preferably, the thickness of the inner wall of the lower chord is 30mm here. Preferably, the second anchor plate has a thickness of 20 mm. As shown in fig. 2 and 6, the third anchoring plate 43 is vertically connected to the inner wall of the lower chord 24, is located at the first end, and is tightly attached in a double-plate manner, and preferably has a thickness of 20 mm. As shown in fig. 2 and 7, the fourth anchoring plate 44 is vertically connected to the inner wall of the first connecting member 23 and located at the larger size part of the bell mouth, the fourth anchoring plate 44 is provided as a double plate with a double plate interval of 40-80mm, the first anchoring plate 41, the second anchoring plate 42, the third anchoring plate 43 and the fourth anchoring plate 44 are provided with the prestressing holes 45 uniformly distributed in three directions corresponding to the trisections of the stiffening ribs 26, the stress mechanism 30 penetrates into the connecting member 23 and is uniformly divided into trisections corresponding to the stiffening ribs 26 and penetrates into the lower chord 24, passes through the lower chord 24 and correspondingly extends out of the connecting member 23 correspondingly connected to the other end of the lower chord, and then the prestressing holes 45 of the first anchoring plate 41, the second anchoring plate 42 and the third anchoring plate 43 are penetrated into the prestressing mechanism 30 trisections, and anchoring the stressing mechanism 30 in the lower chord 24.
As shown in fig. 2 and 3, the base structure of the end portion of the prestressed truss according to the present invention includes three steel strands 31, a protective cover 32 and sleeves 33, where the sleeves 33 are disposed in the lower chord 24, the steel strands 31 are divided into three parts and correspondingly penetrate into the three sleeves 33 along one end of the lower chord 24, the prestressed holes 45 of the first anchor plate 41, the second anchor plate 42 and the third anchor plate 43 are correspondingly sleeved into the sleeves 33 and sequentially disposed in the lower chord 24, the steel strands 31 and the sleeves 33 extend out of the other end of the lower chord 24 and are sequentially sleeved into the first anchor plate 41, the second anchor plate 42 and the third anchor plate 43 corresponding to the prestressed holes 45;
the protective cover 32 is fastened to the second end and a cavity is formed inside the protective cover 32.
Specifically, the steel strand 31 penetrates into the pre-stressed hole 45 and is anchored at the second end of the connecting member 23, the sleeve 33 penetrates into the steel strand 31 and divides the steel strand into three parts, the pre-stressed holes 45 of the first anchoring plate 41, the second anchoring plate 42 and the third anchoring plate 43 are correspondingly sleeved into the sleeve 33, and the sleeve 33 extends out of the surface of the third anchoring plate 43 by about 100 mm. The steel strand 31 is equally divided into three parts through the prestressed holes 45, and the sleeve 33 is adopted to wrap the steel strand 31 in the lower chord 24, so that the problems that the sleeve 33 is insufficient in binding force in the lower chord 24, and the play and the stability are easy to occur are effectively solved.
Wherein, the second end is equipped with the safety cover 32, the inside cavity that is equipped with of safety cover 32, the safety cover 32 detains to be located the second end and with anchor backing plate 25 forms sealedly, the safety cover 32 corresponds vertical upward direction and has opened grouting holes 52, will steel strand wires 31 stretch out the part anchor of second end in the safety cover 32, further increase the anchor power.
As shown in fig. 2 and 7, in the prestressed truss end base structure of the present invention, grouting holes 50 are formed in surfaces of the connecting members corresponding to the fourth anchoring plates 44, the fourth anchoring plates 44 are arranged in pairs, the grouting holes 50 are disposed between adjacent fourth anchoring plates 44, and vent holes 51 are formed in surfaces of the connecting members corresponding to the fourth anchoring plates 44 and the stiffening ribs 26.
As shown in fig. 2 and 3, the anchoring mechanism 40 of the prestressed truss end foundation structure of the present invention further includes a concrete structure formed by casting, wherein the concrete structure is cast between the adjacent fourth anchoring plates 44, between the anchor backing plate 25 in the protective cover 32 and in the connecting member and the fourth anchoring plates 44 respectively.
Specifically, the fourth anchoring plates 44 are arranged at intervals, the grouting holes 50 are formed between the adjacent fourth anchoring plates 44 corresponding to the first connecting pieces 23, during construction, concrete is poured into the grouting holes 50, and the air in the sealed cabin formed by the adjacent fourth anchoring plates 44 is removed from the grouting holes 50, so that the pouring effect is better, and the quality is ensured. Preferably, the fourth anchor plate has a thickness of 5 mm. The exhaust holes 51 are located on the inner wall of the connecting member 23 of the stiffener 26 corresponding to the fourth anchoring plate 44. When the steel strand 31 is further anchored in the connecting piece, another grouting hole is formed in the surface of the connecting piece corresponding to the position between the anchor backing plate 25 and the fourth anchoring plate 44, and pouring is continued in the other grouting hole, at this time, air in the connecting piece between the stiffening rib 26 and the fourth anchoring plate 44 is sequentially discharged along the air discharge hole 52, so that gap grouting of the steel strand 31 is full and dense. The method effectively solves the problems that the grouting quality is not easy to control in the original designed grouting structure and mode, and the like.
The invention also provides a construction method of the base structure at the end part of the prestressed truss, and the construction method is explained below.
The construction method comprises the following steps of:
as shown in fig. 1, providing a base 20, placing the base 20 on top of the concrete support column 62 which is oppositely arranged and the base 20 comprises a lower chord 21, placing the lower chord 21 on top of the base 20 and fixedly connecting with an outermost truss 61 and an upper chord 63 of the truss 60;
as shown in fig. 1 and fig. 2, a connecting member 23 is provided, a second end of the connecting member 23 has a size larger than that of a first end, and forms a gradual connection with the splicing connection of the first end, and the first end of the connecting member 23 passes through the corresponding lower chord 21 and is connected with the corresponding end of the lower chord 24;
referring to fig. 2 and 3, a stress mechanism 30 is provided, and the stress mechanism 03 is inserted into the connecting piece 23 at one end of the lower chord 24 and passes through the lower chord 24 and then out of the connecting piece 23 at the other end of the lower chord 24;
as shown in fig. 2 and 3, an anchor mechanism 40 is provided, one end of the stress mechanism 30 is anchored by the anchor mechanism 40, the other end of the stress mechanism 30 is tensioned and prestressed, and the other end of the stress mechanism 30 is anchored by the anchor mechanism 40, thereby completing the construction of the end base 20 structure of the prestressed truss 60.
The construction method of the invention utilizes the base 20, the connecting piece 23, the stress mechanism 30 and the anchoring mechanism 40 which are arranged on the concrete supporting columns 62, so that the lower chord 24 forms prestress tension between the oppositely arranged concrete supporting columns 62, the connecting piece 23 forms gradual change type connection, the requirement of the minimum distance between the stress mechanism 30 and the connecting piece is further increased, meanwhile, the stress mechanism 30 is respectively anchored at the end parts of the connecting piece 23 which are connected with the two ends of the lower chord 24, the anchoring force is further increased, and the prestress tension of the lower chord 24 is further realized.
Referring to fig. 2 and 3, in one embodiment of the present invention, an anchoring mechanism 40 is provided that includes a stiffening rib 26, an anchor pad 25, a first anchor plate 41, a second anchor plate 42, a third anchor plate 43, and a fourth anchor plate 44;
referring to fig. 2 and 4, trisected pre-stressed holes 45 are correspondingly formed in the first, second, third and fourth anchor plates 41, 42, 43, 44, the first, second and third anchor plates 41, 42, 43 are sequentially plugged into the lower chord 24 and are sleeved on the stress mechanism 30 through the pre-stressed holes 45, and a pair of fourth anchor plates 44 are plugged into the inner walls of the opposite connecting members 23;
as shown in fig. 2 and 7, a grouting hole 50 is formed on the upper surface of the connecting member 23 corresponding to the fourth anchoring plate 44, an exhaust hole 51 is formed between the connecting member 23 corresponding to the fourth anchoring plate 44 and the second end of the connecting member 23, grouting is performed in the grouting hole 50, air is pressed into the portion, close to the second end, of the fourth anchoring plate 44 through the pre-stressing hole 45 of the fourth anchoring plate 44, and is exhausted through the exhaust hole 51, and grouting is performed to form a concrete structure so as to anchor the corresponding stress mechanism 30;
as shown in fig. 2 and 3, the end of the stress mechanism 30 is anchored to the second end and a stiffening rib 26 is provided, the stiffening rib 26 is evenly spliced in the connecting piece 23 in a trisection manner, and the other end of the stiffening rib 26 extends out of the upper surface of the connecting piece 23 and is fixedly connected with the lower bowstring ball 21; covering the anchor backing plate 25 at the second end of the connecting member 23;
referring to fig. 2 and 3, another grouting hole is formed on the upper surface of the stiffening rib 26 corresponding to the connecting member 23, and grouting is performed on a corresponding portion between the end of the stressing mechanism 30 and the fourth anchoring plate 44 to further anchor the stressing mechanism 30.
Referring to fig. 2 and 7, in a construction method of the present invention, the method further includes:
a protective cover 32 is buckled at the second end of the connecting piece 23, a grouting hole 52 is formed above the protective cover 32, and the grouting hole 52 is grouted to form the end part of the stress mechanism 30 to be anchored.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a prestressing force truss end base structure, carries out stretch-draw and anchor to the lower chord between the concrete support post of a pair of relative setting of truss bottom, its characterized in that, base structure includes:
the base is arranged at the top of the corresponding concrete support column in the vertical direction;
the connecting pieces are horizontally arranged on the corresponding bases, the first ends of the connecting pieces are fixedly connected with the corresponding end parts of the lower chords, the second ends of the connecting pieces are fixedly connected with the corresponding bases, the sizes of the first ends are smaller than those of the second ends, gradual change connecting parts are formed, and the connecting pieces are hollow;
the stress mechanism penetrates through the connecting piece at one end of the lower chord and penetrates out of the connecting piece at the other end of the lower chord, and the end part of the stress mechanism is positioned on the outer side of the corresponding connecting piece; and
the anchoring mechanism is arranged in the connecting piece, one end part of the stress mechanism is anchored through the anchoring mechanism, and the other end part of the stress mechanism is anchored through the anchoring mechanism after the other end part of the stress mechanism is tensioned to apply prestress.
2. The end base structure of a prestressed truss as defined in claim 1, wherein said second end of said connecting member extends through and is partially outside said lower bowstring, said anchoring means is partially connected to the outer surface of said connecting member and is fixedly connected to said lower bowstring, and said lower bowstring is fixedly connected to said upper chord and the outermost truss.
3. The base structure of an end of a prestressed truss as claimed in claim 2, wherein said anchoring mechanism includes an anchor backing plate and a stiffening rib, said anchor backing plate is covered at the second end of said connecting member, said stiffening rib has three ends, one end of each stiffening rib is spliced with the corresponding connecting member, the other end of said stiffening rib extends out of the outer surface of the corresponding connecting member and is fixedly connected with said lower bowstring, said stiffening rib is disposed at the mouth of the corresponding connecting member and is fixedly connected with said anchor backing plate.
4. The prestressed truss end base structure of claim 3, wherein said anchoring mechanism further comprises a first anchoring plate, a second anchoring plate, a third anchoring plate and a fourth anchoring plate disposed on the inner wall of said lower chord, said first anchoring plate being disposed in said lower chord and away from said tapered joint, said second anchoring plate being disposed in said lower chord and close to said tapered joint, said third anchoring plate being disposed in said first end of said connecting member and being of the same size as said second anchoring plate, said fourth anchoring plate being disposed in said connecting member and disposed in said tapered joint and at the same size as said second end;
the first anchor plate, the second anchor plate third anchor plate with the fourth anchor plate is equipped with three prestressed hole, stress mechanism penetrates the connecting piece that is located a lower chord one end department and passes the correspondence again prestressed hole, and penetrates the lower chord is worn out simultaneously the lower chord other end corresponds prestressed hole, and then stretches out the connecting piece that is located another end department of lower chord to realize both ends stretch-draw.
5. The base structure of the end part of the prestressed truss as claimed in claim 4, wherein the stress mechanism comprises three steel strands, a protective cover and sleeves, the sleeves are arranged in the lower chord in a penetrating manner, the steel strands are divided into three parts and correspondingly penetrate into the three sleeves along one end of the lower chord, the prestress holes of the first anchoring plate, the second anchoring plate and the third anchoring plate are correspondingly sleeved in the sleeves in sequence, the steel strands and the sleeves extend out of the other end of the lower chord and are sequentially sleeved in the first anchoring plate, the second anchoring plate and the third anchoring plate in sequence corresponding to the prestress holes;
the protective cover is buckled at the second end and a cavity is formed in the protective cover.
6. The prestressed truss end foundation structure of claim 4, wherein said connecting members have grouting holes formed on the surfaces thereof corresponding to said fourth anchoring plates, said fourth anchoring plates are arranged in pairs, said grouting holes are disposed between adjacent fourth anchoring plates, and said connecting members have vent holes formed on the surfaces thereof corresponding to said fourth anchoring plates and said reinforcing ribs.
7. The prestressed truss end substructure of claim 6, wherein said anchoring means further comprises a poured concrete structure, said concrete structure being poured between adjacent said fourth anchoring plates, between said anchoring pads in said protective covering and between said anchoring pads in said connecting member and said fourth anchoring plates, respectively.
8. A construction method of a base structure at the end part of a prestressed truss is used for tensioning and anchoring a lower chord between a pair of oppositely arranged concrete support columns at the bottom of the truss, and is characterized by comprising the following steps:
providing a base, placing the base on the tops of the oppositely arranged concrete support columns, wherein the base comprises a lower chord ball, and placing the lower chord ball on the top of the base and fixedly connecting the lower chord ball with an outermost truss and an upper chord of the truss;
providing a connecting piece, wherein the size of a second end of the connecting piece is larger than that of a first end, a gradual change connecting part is formed at the splicing connecting part of the second end and the first end, and the first end of the connecting piece penetrates through the corresponding lower chord ball and is connected with the end part corresponding to the lower chord;
providing a stress mechanism, wherein the stress mechanism penetrates into the connecting piece at one end part of the lower chord and penetrates out of the connecting piece at the other end part of the lower chord through the lower chord;
and providing an anchoring mechanism, anchoring one end part of the stress mechanism by using the anchoring mechanism, tensioning the other end part of the stress mechanism and applying prestress, and anchoring the other end part of the stress mechanism by using the anchoring mechanism, thereby completing the construction of the base structure at the end part of the prestressed truss.
9. The construction method according to claim 8, wherein the provided anchoring mechanism comprises a stiffening rib, an anchor backing plate, a first anchoring plate, a second anchoring plate, a third anchoring plate and a fourth anchoring plate;
correspondingly arranging trisected prestressed holes in the first anchoring plate, the second anchoring plate, the third anchoring plate and the fourth anchoring plate, sequentially inserting the first anchoring plate, the second anchoring plate and the third anchoring plate into the lower chord and sleeving the stress mechanism through the prestressed holes, and inserting a pair of fourth anchoring plates into the inner wall of the opposite connecting piece;
arranging a grouting hole on the upper surface of the connecting piece corresponding to the fourth anchoring plate, arranging an exhaust hole between the connecting piece corresponding to the fourth anchoring plate and the second end of the connecting piece, grouting into the grouting hole, extruding air into the part, close to the second end, of the fourth anchoring plate through the prestress hole of the fourth anchoring plate, exhausting the air through the exhaust hole, and grouting to form a concrete structure so as to anchor a corresponding stress mechanism;
anchoring the end part of the stress mechanism to the second end and providing stiffening ribs, uniformly distributing and splicing the stiffening ribs in the connecting piece in a trisection manner, and extending the other ends of the stiffening ribs out of the upper surface of the connecting piece and fixedly connecting the other ends of the stiffening ribs with the lower chord ball; covering the anchor backing plate at the second end of the connecting piece;
and another grouting hole is formed in the upper surface of the stiffening rib corresponding to the connecting piece, and grouting is performed on the corresponding part between the end part of the stress mechanism and the fourth anchoring plate so as to further anchor the stress mechanism.
10. The construction method according to claim 9, further comprising:
and a protective cover is arranged at the second end of the connecting piece in a buckled mode, and a grouting hole is formed above the protective cover and is used for grouting and forming the grouting hole to anchor the end part of the stress mechanism.
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| CN112095779B (en) | 2022-01-21 |
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