CN111172854A - Connecting structure for assembled box-shaped UHPC compression member and construction method thereof - Google Patents
Connecting structure for assembled box-shaped UHPC compression member and construction method thereof Download PDFInfo
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- CN111172854A CN111172854A CN202010072140.5A CN202010072140A CN111172854A CN 111172854 A CN111172854 A CN 111172854A CN 202010072140 A CN202010072140 A CN 202010072140A CN 111172854 A CN111172854 A CN 111172854A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a connecting structure for an assembled box-shaped UHPC (ultra high performance concrete) compression member, which comprises a pair of adjacently arranged box-shaped UHPC compression members and a pair of steel box beam joints arranged between the adjacent box-shaped UHPC compression members, wherein the pair of steel box beam joints are respectively connected with the pair of box-shaped UHPC compression members; one end of the steel box girder joint is pre-buried and attached to an inner cavity of the box-shaped UHPC compression member, the other end of the steel box girder joint extends to the outside of the box-shaped UHPC compression member to form an extension section, the end part of the extension section is provided with a connecting surface, and the connecting surface is provided with a plurality of through holes; adjacent connect the setting of face laminating, and adjacent through-hole one-to-one on connecting the face is adjacent connect the coupling assembling of face through locating in the through-hole and connect. The invention also provides a construction method of the connection structure. The assembled box-shaped UHPC compression member has the advantages of simple structure, safety, reliability, high construction efficiency, low construction cost and the like.
Description
Technical Field
The invention belongs to the field of bridge engineering, and particularly relates to a connecting structure of an assembled compression member and a construction method thereof.
Background
The compression members are widely applied to bridge engineering, such as arch ribs, bridge piers, compression columns and the like of arch bridges. The high compressive strength of the UHPC can lighten the dead weight of a compression member, so that the application range of a compression structure is wider, for example, the box-shaped UHPC compression member is adopted as an arch rib to lighten the dead weight of an arch bridge structure, the spanning capability is increased, and the realization of a large-span arch bridge becomes possible; by applying the box-shaped UHPC compression member to the compression column, the wall thickness can be reduced, and the structure can be lightened.
Compared with a completely cast-in-place compression member, the prefabricated assembled compression member has the advantages of convenience in construction, shortened construction period, guaranteed member quality, protection of field environment and the like, so that the assembled box-shaped UHPC compression member has wide application prospect. However, the assembled structure is prone to the following problems: the connecting nodes are weaker than the prefabricated sections, and the overall structure is damaged at the connecting nodes firstly, so that the quality of the assembled structure is influenced; the integrity of the assembled structure is not strong, the anti-seismic performance is weak, and the assembled structure is difficult to be widely applied to high-seismic defense areas. Therefore, the development of an efficient and safe connection structure between the assembled box-shaped UHPC compression members is a problem to be solved.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the background technology and provide a connecting structure of an assembled box-shaped UHPC compression member and a construction method thereof, wherein the connecting structure is simple in structure, safe and reliable, high in construction efficiency and low in construction cost. In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a connecting structure for an assembled box-shaped UHPC compression member comprises a pair of adjacently arranged box-shaped UHPC compression members and a pair of steel box beam joints arranged between the adjacent box-shaped UHPC compression members, wherein the pair of steel box beam joints are respectively connected with the pair of box-shaped UHPC compression members; one end of the steel box girder joint is pre-buried and attached to an inner cavity of the box-shaped UHPC (ultra high performance concrete) compression member, the other end of the steel box girder joint extends to the outside of the box-shaped UHPC compression member to form an extending section, the end part of the extending section is provided with a connecting surface, and the connecting surface is provided with a plurality of through holes (the diameter d1 of each through hole and each connecting component is 10-50 mm); adjacent connect the setting of face laminating, and adjacent through-hole one-to-one on connecting the face is adjacent connect the coupling assembling of face through locating in the through-hole and connect.
In the above connection structure for the assembled box-shaped UHPC compression member, preferably, the length of the protruding section is 0.1 to 1m, the connection surface is perpendicular to the protruding section, and the outer edge of the connection surface does not exceed the outer surface of the protruding section. The length and the arrangement mode of the extending sections are beneficial to improving the structural stability of the connecting node, and enough UHPC cast-in-place section length is reserved, so that the cast-in-place UHPC section and longitudinal steel bars extending out of two adjacent prefabricated box type UHPC compression members are effectively anchored, and the mechanical properties of temporary connection and subsequent use of the connecting node are ensured.
In the above connection structure for assembling the box-shaped UHPC compression member, preferably, the inner cavity of the steel box girder joint is provided with a plurality of trapezoidal steel stiffening ribs, and one end of each trapezoidal steel stiffening rib abuts against the connection surface; lie in be equipped with the through-hole between the adjacent trapezoidal steel stiffening rib on same edge of steel box girder joint, and be located 3 are no less than to the same number of edge trapezoidal steel stiffening rib of steel box girder joint, and 2 are no less than to the number of through-hole on same edge, and 1 is no less than to the number of through-hole on the chamfer. According to the invention, the trapezoidal steel stiffening ribs are arranged along the periphery of the inner cavity of the steel box girder joint, so that the rigidity and the compression performance of the steel box girder joint can be effectively improved, the steel box girder joint is prevented from being locally bent under pressure after being connected, and the stability and the safety of connection are ensured. The number of the preferred trapezoidal steel stiffening ribs can ensure the rigidity and stability of the steel box girder joint, and the number of the preferred through holes can ensure the reliability and safety of the connection of the box-shaped UHPC compression member.
In the above connection structure for the assembled box-shaped UHPC compression member, preferably, the height a7 of the trapezoidal steel stiffener is 0.2 to 1m, the long base length b6 is 0.05 to 0.4m, the short base length b7 is 0.02 to 0.2m, and the thickness b8 is 0.01 to 0.08 m; the distance w1 between adjacent trapezoidal steel stiffening ribs on the same edge of the steel box girder joint is 0.1-0.8 m; the long bottom edge of the trapezoidal steel stiffening rib is abutted to the connecting surface.
In the above connection structure for the assembled box-shaped UHPC pressure-bearing member, preferably, the end portions of four sides of the box-shaped UHPC pressure-bearing member are provided with a plurality of wedge-shaped key teeth which are uniformly distributed and protrude outwards, the length a3 of the outer convex side of each wedge-shaped key tooth is 0.2-0.6m, the length a4 of the inner concave side of each wedge-shaped key tooth is 0.1-0.4m, the thickness b3 of each key tooth is 0.03-0.1m, the width h3 of each key tooth is 0.1-1m, and the distance e1 of each wedge-shaped key tooth from the edge of the box-shaped UHPC pressure-bearing member is 0.2-1 m. The number of the wedge-shaped key teeth on each edge is not less than 2. According to the invention, the wedge-shaped key teeth are arranged, so that the integrity of the UHPC compression section cast in situ and the box-shaped UHPC compression member prefabricated in a factory can be improved, and the common stress is realized. In the present invention, the total length of the wedge teeth must be less than the length of the sides of the box-shaped UHPC compression member, and other similar dimensional limitations will suffice in the present invention.
In the above connection structure for the assembled box-shaped UHPC pressure-bearing member, preferably, the cross-sectional shape of the inner cavity of the box-shaped UHPC pressure-bearing member is a square shape provided with chamfers, the side lengths a1 and a2 of the box-shaped UHPC pressure-bearing member are 1.0 to 8m, the wall thicknesses b1 and b2 are 0.1 to 1m, and the chamfer dimensions h1 and h2 are 0.1 to 1 m. The box-type UHPC compression member preferably selected by the invention saves materials, has light self weight and can well meet the requirements of construction stage and use stage.
In the above connection structure for assembling box-shaped UHPC compression members, preferably, the steel box girder joint has a hollow structure, and the cross-sectional shape of the steel box girder joint is a square shape provided with chamfers, the side lengths a5 and a6 of the steel box girder joint are 0.6-7.6m, the length w3 of the steel box girder joint is 0.4-4m, the thicknesses b4 and b9 of the steel plate are 10-80mm, the chamfer sizes h4 and h5 are 0.1-0.5m, and the width b5 of the connection surface is 0.06-0.5 m. If the size of the steel box girder joint chamfer is proper, a trapezoidal steel stiffening rib is arranged at the chamfer, and the distance w2 between the trapezoidal steel stiffening rib and the chamfer is 0.1-0.5 m; if the size of the chamfer of the steel box girder joint is too small, no trapezoidal steel stiffening rib is arranged at the chamfer.
According to the invention, the shape of the steel box girder joint is consistent with that of the box-shaped UHPC compression member, the size of the steel box girder joint is fitted, the UHPC is directly poured on the outer surface of the steel box girder joint when the steel box girder joint is prefabricated in a factory, the construction is convenient, the connection performance of the box-shaped UHPC compression member and the steel box girder joint can be ensured, and the chamfer design is also convenient for pouring the UHPC on site. According to the invention, the steel box girder joint extends out of the surface of the prefabricated box-shaped UHPC compression member, after the box-shaped UHPC compression member is connected by the connecting bolt, the extending part of the steel box girder joint can serve as an internal mold of a cast-in-situ UHPC segment, so that the pouring is facilitated, the steel box girder joint can participate in the stress all the time in the later use process of the compression structure, the stress performance at the connecting node is improved, and compared with a dry joint, the mechanical property is better. The outer edge of the connecting surface of the steel box girder joint does not exceed the outer surface of the extending section, and the inner cavity is connected by the connecting component, so that the outer part of the steel box girder joint can be smooth, and the cast-in-place UHPC section can be compactly poured. In the later use process, engineering personnel can enter the interior of the compression member to complete the inspection and replacement work of the connecting component, and the reliability of the connecting structure is ensured. In addition, in the invention, the shape of the steel box girder joint needs to be consistent with that of the box-shaped UHPC compression member, the size of the inner cavity of the steel box girder joint is ensured to be close to that of the inner cavity of the box-shaped UHPC compression member, the continuity of the whole structure is ensured, the mechanical property of the connecting structure is improved, and the integrity and the seismic performance of the connecting structure are improved.
In the above connection structure for assembling box-shaped UHPC compression members, preferably, the outer surface of the steel box beam joint is provided with a plurality of uniformly distributed studs, the end of the box-shaped UHPC compression member extends outwards to form a plurality of longitudinal ribs, and the corresponding longitudinal ribs between adjacent box-shaped UHPC compression members are arranged in a staggered and close manner. The nominal diameter range of the stud is 10-25mm, and the design value range of the length after welding is 40-300 mm. The optimized stud diameter and the welded length enable the stud poured in the UHPC to provide strong shearing resistance and pulling resistance, and are necessary guarantee for good connection of the steel box girder joint and the box type UHPC compression member.
The number of transverse rows of the pins arranged on the outer surface of each straight edge of the steel box girder joint is equal to or more than 3, the number of longitudinal rows of the pins extending out of the prefabricated box-shaped UHPC pressure-bearing component is equal to or more than 1, and the number of longitudinal rows of the pins embedded in the box-shaped UHPC pressure-bearing component is equal to or more than 2. The number of transverse rows of the pins arranged on the outer surface of each chamfer of the steel box girder joint is equal to or more than 1 row, the number of longitudinal rows of the pins extending out of the prefabricated box-shaped UHPC pressure member is equal to or more than 1 row, and the number of longitudinal rows of the pins embedded in the box-shaped UHPC pressure member is equal to or more than 2 rows. The pin spacing e2 in the transverse direction of the extension section is 100-500mm, and the pin spacing e4 in the longitudinal direction of the prefabricated section is 90-400 mm. The distance e3 between the bolt and the connecting surface at the cast-in-place position is 40-200 mm. In the invention, the optimized number and arrangement of the studs are beneficial to uniformly and effectively transmitting various actions on the joint of the steel box girder to the box-shaped UHPC pressed component, so that the joint of the steel box girder can be prevented from rotating in various directions relative to the box-shaped UHPC pressed component, and the connection performance between the sections of the box-shaped UHPC pressed component is ensured.
The diameter of the longitudinal bar is 12-28mm, and the diameter of the stirrup is 10-20 mm. The distance between the longitudinal ribs is 0.1-0.4m, and the distance between the stirrups is 0.1-0.5 m. The length of the longitudinal rib extending out of the box-shaped UHPC compression member is 0.1-1m, and the length of the longitudinal rib extending out of the wedge-shaped key teeth is reduced by a key tooth thickness b 3. After the box-shaped UHPC compression member is temporarily connected, equal to or more than 2 stirrups are bound on the longitudinal steel bars of the extending section. According to the invention, the longitudinal ribs and the stirrups are arranged in the box-type UHPC compression member in the area near the steel box girder joint, so that the stress performance of the box-type UHPC compression member can be effectively improved, and the box-type UHPC compression member is prevented from cracking at the joint of the box-type UHPC compression member and the steel box girder joint. After the longitudinal steel bars are stretched out of the stretching sections and the stirrups are bound, and UHPC is cast in place, the staggered adjacent longitudinal steel bars correspondingly stretched out of two adjacent prefabricated box type UHPC compression members can be equivalent to a through long steel bar under the effective anchoring action of the UHPC, so that the compression resistance and the tensile resistance of the stretching sections can be greatly improved, the connection structure between the box type UHPC compression members cannot be damaged due to the tensile force under some accidental and unexpected conditions (such as earthquakes and the like), and the connection safety of the compression sections is improved.
In the above connection structure for the assembled box-shaped UHPC stressed members, preferably, a UHPC casting layer is disposed between adjacent box-shaped UHPC stressed members and on the outer surface of a pair of steel box beam joints, and the UHPC casting layer is flush with the outer surface of the box-shaped UHPC stressed members.
As a general technical concept, the present invention also provides a construction method for a connection structure of an assembled box-shaped UHPC compression member, comprising the steps of:
s1: prefabricating a box-shaped UHPC compression member in a factory, and pre-burying a steel box girder joint while prefabricating the box-shaped UHPC compression member so that the box-shaped UHPC compression member and the steel box girder joint form a whole;
s2: fixing a box-shaped UHPC (ultra high performance concrete) stressed member, hoisting the adjacent box-shaped UHPC stressed members in place to ensure that the connecting surfaces of the steel box girder joints on the two adjacent box-shaped UHPC stressed members are jointed and the through holes are aligned, and fixedly connecting the two adjacent connecting surfaces through the through holes by using a connecting assembly (operating in an internal abdominal cavity) to finish temporary connection;
s3: binding longitudinal bars between two adjacent box-shaped UHPC compression members by using stirrups, erecting an outer-coated template at the joint of the adjacent steel box beams, and forming a round hole with the diameter of 0.1-0.5m on the outer-coated template so as to pour the UHPC; and pouring UHPC and maintaining, and removing the outer-coated template after maintaining to finish the fixed connection between the adjacent box-shaped UHPC pressed components.
In the construction method, when the integrally assembled box-shaped UHPC compression member is constructed by using a plurality of connection structures, S2 can be repeated to temporarily connect the box-shaped UHPC compression members and then S3 can be performed; S2-S3 can also be repeated to complete the fixed connection of multiple box-shaped UHPC compression members.
In the invention, the steel box girder joint and the connecting bolt are both steel members, the wedge-shaped key teeth and the box-shaped UHPC compression member unit are both UHPC material members, and the bending tensile strength of the UHPC material is more than 20MPa, and the compressive strength is more than 100MPa (such as preferable Reactive Powder Concrete (RPC) and the like). The steel box girder joint can ensure the machining precision, is convenient to connect, has high compressive strength, and can meet the requirement on the compressive performance in the construction stage.
In the invention, wedge-shaped key teeth on four sides of the end face of the box-shaped UHPC compression member and the box-shaped UHPC compression member are prefabricated and cast together in a factory. The steel box girder joint and the box-shaped UHPC compression member are prefabricated and attached inside, and are connected through the stud on the outer surface of the steel box girder joint, so that common stress is realized. In the invention, the connecting component connects the two prefabricated sections together, which is convenient for erecting an outer-covering mould and casting UHPC on the joint in situ in the construction stage, and can also improve the stress performance of the connecting joint of the box-shaped UHPC compression member in the use stage.
According to the invention, after the adjacent box-shaped UHPC compression members are temporarily connected through the connecting bolts, the templates are externally wrapped and UHPC is poured from the circular holes, and then maintenance is carried out, so that the connecting nodes are not weakened, but are stronger than the prefabricated sections, and the connecting performance of the adjacent box-shaped UHPC compression member units is ensured.
According to the invention, a high-strength connecting component is adopted between adjacent box-shaped UHPC compression member units for temporary connection, then the UHPC is cast in situ, and the sizes of the UHPC material, the box-shaped UHPC compression member units, the steel box girder joint and the like are limited, so that the construction convenience and feasibility are improved on the premise of ensuring the connection performance of the sections of the box-shaped UHPC compression member units.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, the adjacent box-shaped UHPC compression members are temporarily connected by adopting the connecting component, then the UHPC is cast in situ for connection, and the performance requirement of a connecting node can be ensured without performing field welding work, so that the problems of welding work and difficulty in ensuring the welding quality in an environment with difficult welding (such as high-altitude welding) are solved, the problems of static performance and fatigue performance of the connecting node caused by the welding quality problem are also solved, and the connecting quality of the box-shaped UHPC compression members is ensured.
2. According to the invention, after the connecting components are used for connecting adjacent box-shaped UHPC compression member segments, UHPC is poured in situ and maintained, the structural integrity is ensured, and the UHPC cast-in-situ segment and the steel box girder joint are stressed together in use, so that the mechanical property and the anti-seismic property of the connecting node are improved, the damage caused by other actions such as tensile force generated by the connecting node under accidental and unexpected conditions (such as earthquake and the like) is prevented, and the reliability of the connection of the box-shaped UHPC compression member units is ensured.
3. The box-shaped UHPC compression member adopted by the invention has simple structure and high factory presetting degree, and the steel box girder joints are adopted for connection, so that the compression member has better stress performance, when in construction, a plurality of sections of box-shaped UHPC compression members can be temporarily connected, the steel box girder joints bear the stress, and then the UHPC sections are poured together, thereby greatly reducing the time for casting UHPC in situ, effectively increasing the construction efficiency and reducing the construction cost.
4. The box-shaped UHPC compression member connecting structure adopted by the invention is connected by the connecting component from the interior of the box-shaped member in the construction stage, and in the use stage, engineering personnel can enter the interior of the compression member to complete the inspection and replacement work of the connecting component, thereby ensuring the reliability of the connecting structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a box-shaped UHPC compression member and a steel box girder joint in the embodiment of the invention after connection.
Fig. 2 is a schematic structural diagram of a steel box girder joint in the embodiment of the invention.
Fig. 3 is a schematic structural view of a connection structure of a box-shaped UHPC compression member in the embodiment of the present invention.
Fig. 4 is a top view of fig. 3.
Fig. 5 is a schematic structural diagram of the connection structure of the box-shaped UHPC compression members after an outer covering template is erected in the embodiment of the invention.
Fig. 6 is a cross-sectional view of a box-shaped UHPC compression member in an embodiment of the present invention.
FIG. 7 is a top view of a box-shaped UHPC compression member in an embodiment of the present invention.
Fig. 8 is a front view of a box-shaped UHPC compression member in an embodiment of the present invention.
Fig. 9 is a cross-sectional view of a steel box beam joint in an embodiment of the invention.
Fig. 10 is a side view (schematic dimensional structure) of a steel box girder joint according to an embodiment of the present invention.
FIG. 11 is a schematic structural diagram of a trapezoidal steel stiffener according to an embodiment of the present invention.
Fig. 12 is a front view of a steel box beam joint in an embodiment of the invention.
Fig. 13 is a side view of a steel box beam joint in an embodiment of the invention.
Fig. 14 is a schematic structural view of a connection structure of box-shaped UHPC compression members provided with a UHPC casting layer in the embodiment of the present invention.
Illustration of the drawings:
1. a box-shaped UHPC compression member; 2. a steel box girder joint; 21. a protruding section; 22. a connecting surface; 23. a through hole; 3. a trapezoidal steel stiffener; 4. wedge-shaped key teeth; 5. a stud; 6. longitudinal ribs; 7. coating a template outside; 8. pouring a UHPC layer; 9. a connecting assembly is provided.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1:
as shown in fig. 1 to 5, the connecting structure for an assembled box-shaped UHPC compression member of the present embodiment includes a pair of adjacently disposed box-shaped UHPC compression members 1 and a pair of steel box beam joints 2 disposed between the adjacent box-shaped UHPC compression members 1, the pair of steel box beam joints 2 being connected to the pair of box-shaped UHPC compression members 1, respectively; one end of the steel box girder joint 2 is pre-buried and attached to an inner cavity of the box-shaped UHPC pressed component 1, the other end of the steel box girder joint extends to the outside of the box-shaped UHPC pressed component 1 to form an extending section 21, a connecting surface 22 is arranged at the end part of the extending section 21, and a plurality of through holes 23 are formed in the connecting surface 22; the adjacent connection surfaces 22 are attached to each other, the through holes 23 in the adjacent connection surfaces 22 correspond to each other one by one, and the adjacent connection surfaces 22 are connected through the connecting assembly 9 arranged in the through holes 23. In this embodiment, the connecting assembly 9 is a high-strength bolt.
In this embodiment, the box-shaped UHPC compression member is an arch rib for an extra-large span steel-UHPC composite truss arch bridge, the arch rib is a thin member, and the bending tensile strength of the UHPC material is 20MPa or more and the compressive strength is 100MPa or more.
In this embodiment, the length of the extending section 21 is 0.18m, the connecting surface 22 is perpendicular to the extending section 21, and the outer edge of the connecting surface 22 does not exceed the outer surface of the extending section 21.
In the embodiment, the inner cavity of the steel box girder joint 2 is provided with a plurality of trapezoidal steel stiffening ribs 3, and one end of each trapezoidal steel stiffening rib 3 is abutted against the connecting surface 22; be located and be equipped with through-hole 23 between the adjacent trapezoidal steel stiffening rib 3 of steel box girder joint 2 same edge, and the quantity that is located trapezoidal steel stiffening rib 3 of steel box girder joint 2 same edge is 6, and the quantity of through-hole is 5, establishes 1 through-hole on every chamfer, and the diameter d1 of through-hole is 0.03 m.
As shown in fig. 11, in this embodiment, the height a7 of the trapezoidal steel stiffener 3 is 0.48m, the long base length b6 is 0.1m, the short base length b7 is 0.05m, and the thickness b8 is 0.02 m; the distance w1 between adjacent trapezoidal steel stiffening ribs 3 on the same edge of the steel box girder joint 2 is 0.21m, and the distance w2 between the trapezoidal steel stiffening ribs 3 at the chamfer is 0.16 m; the long bottom edge of the trapezoidal steel stiffening rib 3 is abutted against the connecting surface 22.
As shown in fig. 7 and 8, in the present embodiment, the end of the four sides of the box-shaped UHPC pressure-bearing member 1 is provided with a plurality of wedge-shaped key teeth 4 protruding outwards, the length a3 of the protruding edge of the wedge-shaped key teeth 4 is 0.3m, the length a4 of the recessed edge is 0.24m, the thickness b3 of the key teeth is 0.05m, the width h3 of the key teeth is 0.2m, the distance e1 of the wedge-shaped key teeth 4 from the edge of the box-shaped UHPC pressure-bearing member 1 is 0.4m, and each edge is provided with 3 wedge-shaped key teeth 4.
As shown in fig. 6, in the present embodiment, the sectional shape of the inner cavity of the box-shaped UHPC pressure-receiving member 1 is a square shape provided with chamfers, the side lengths a1 and a2 of the box-shaped UHPC pressure-receiving member 1 are 2m, the wall thicknesses b1 and b2 are 0.2m, and the chamfer sizes h1 and h2 are 0.2 m.
As shown in fig. 9 and 10, in the present embodiment, the steel box girder joint 2 has a hollow structure, and the cross-sectional shape of the steel box girder joint 2 is a square shape provided with chamfers, the side lengths a5 and a6 of the steel box girder joint 2 are 1.2m, the length w3 is 0.78m, the thicknesses b4 and b9 of the steel plates are 20mm, the chamfer sizes h4 and h5 are 0.2m, and the width b5 of the joint surface is 0.12 m.
As shown in fig. 12 and 13, in the embodiment, the outer surface of the steel box girder joint 2 is provided with a plurality of uniformly distributed studs 5, the end part of the box-shaped UHPC compression member 1 is provided with a plurality of longitudinal ribs 6 extending outwards, and the corresponding longitudinal ribs 6 between the adjacent box-shaped UHPC compression members 1 are arranged in a staggered and close manner. The pin 5 has a nominal diameter of 19mm and a post-weld length design of 120 mm. 6 rows of pins 5 are transversely arranged on the outer surface of each straight edge of the steel box girder joint 2, 1 row of pins 5 are longitudinally arranged on the part extending out of the box-shaped UHPC compression member 1, and 4 rows of pins 5 are longitudinally arranged in the box-shaped UHPC compression member 1 and are pre-embedded. The outer surface of each chamfer of the steel box girder joint 2 is transversely provided with 1 row of pins 5, the part extending out of the box-shaped UHPC compression member 1 is longitudinally provided with 1 row of pins 5, and the part embedded in the box-shaped UHPC compression member 1 is longitudinally provided with 4 rows of pins 5. The distance e2 between the pegs 5 in the transverse direction of the protruding section 21 is 0.2m, the distance e4 between the pegs 5 in the longitudinal direction is 0.12m, and the distance e3 between the pegs 5 and the connecting surface 22 at the protruding section 21 is 80 mm. The diameter of the longitudinal bars 6 is 20mm, the distance between the longitudinal bars 6 is 230mm, the diameter of the stirrups is 12mm, the distance between the stirrups is 150mm, and 2 stirrups are bound on the longitudinal bars 6.
As shown in fig. 14, in this embodiment, a UHPC casting layer 8 is disposed on the outer surface of a pair of steel box girder joints 2 between adjacent box-shaped UHPC compression members 1, and the UHPC casting layer 8 is flush with the outer surface of the box-shaped UHPC compression member 1.
The embodiment also provides a construction method for the connection structure of the assembled box-shaped UHPC compression member, which comprises the following steps:
s1: prefabricating a plurality of box-shaped UHPC pressure-bearing members 1 in a factory, and pre-burying a steel box girder joint 2 while prefabricating the box-shaped UHPC pressure-bearing members 1 so that the box-shaped UHPC pressure-bearing members 1 and the steel box girder joint 2 form a whole;
s2: firstly, fixing a box-shaped UHPC (ultra high performance concrete) stressed member 1, hoisting the adjacent box-shaped UHPC stressed members 1 in place, enabling the connecting surfaces 22 of the steel box girder joints 2 on the two adjacent box-shaped UHPC stressed members 1 to be attached, aligning the through holes 23, and fixedly connecting the two adjacent connecting surfaces 22 through the through holes 23 by using a connecting assembly 9 to complete temporary connection;
s3: binding longitudinal ribs 6 between two adjacent box-shaped UHPC compression members 1 by using stirrups, erecting an outer-coated template 7 at the position of a joint 2 of the adjacent steel box girders, forming a round hole with the diameter of 360mm on the outer-coated template 7 so as to pour the UHPC, pouring the UHPC and maintaining, and removing the outer-coated template 7 after maintaining, thus finishing the fixed connection between the adjacent box-shaped UHPC compression members 1.
Example 2:
as shown in fig. 1 to 5, the connecting structure for an assembled box-shaped UHPC compression member of the present embodiment includes a pair of adjacently disposed box-shaped UHPC compression members 1 and a pair of steel box beam joints 2 disposed between the adjacent box-shaped UHPC compression members 1, the pair of steel box beam joints 2 being connected to the pair of box-shaped UHPC compression members 1, respectively; one end of the steel box girder joint 2 is pre-buried and attached to an inner cavity of the box-shaped UHPC pressed component 1, the other end of the steel box girder joint extends to the outside of the box-shaped UHPC pressed component 1 to form an extending section 21, a connecting surface 22 is arranged at the end part of the extending section 21, and a plurality of through holes 23 are formed in the connecting surface 22; the adjacent connection surfaces 22 are attached to each other, the through holes 23 in the adjacent connection surfaces 22 correspond to each other one by one, and the adjacent connection surfaces 22 are connected through the connecting assembly 9 arranged in the through holes 23. In this embodiment, the connecting assembly 9 is a high-strength bolt.
In this embodiment, the box-shaped UHPC pressure-receiving member is a pressure-receiving column, the pressure-receiving column is a thin member, and the UHPC material has a flexural tensile strength of 20MPa or more and a compressive strength of 100MPa or more.
In this embodiment, the length of the extending section 21 is 0.1m, the connecting surface 22 is perpendicular to the extending section 21, and the outer edge of the connecting surface 22 does not exceed the outer surface of the extending section 21.
In the embodiment, the inner cavity of the steel box girder joint 2 is provided with a plurality of trapezoidal steel stiffening ribs 3, and one end of each trapezoidal steel stiffening rib 3 is abutted against the connecting surface 22; be located and be equipped with through-hole 23 between the adjacent trapezoidal steel stiffening rib 3 on the same edge of steel box girder joint 2, and be located the same edge of steel box girder joint 2 trapezoidal steel stiffening rib 3's quantity and be 5, the quantity of through-hole is 4, establishes 1 through-hole on every chamfer, and the diameter d1 of through-hole is 0.024 m.
In the embodiment, the height a7 of the trapezoidal steel stiffening rib 3 is 0.36m, the length b6 of the long bottom side is 0.1m, the length b7 of the short bottom side is 0.04m, and the thickness b8 is 0.015 m; the distance w1 between adjacent trapezoidal steel stiffening ribs 3 on the same edge of the steel box girder joint 2 is 0.192m, and the trapezoidal steel stiffening ribs 3 are not arranged at the chamfer angles; the long bottom edge of the trapezoidal steel stiffening rib 3 is abutted against the connecting surface 22.
In the embodiment, the end parts of the four sides of the box-shaped UHPC pressed component 1 are outwards protruded and uniformly provided with a plurality of wedge-shaped key teeth 4, the length a3 of the convex side of each wedge-shaped key tooth 4 is 0.23m, the length a4 of the concave side is 0.18m, the thickness b3 of each key tooth is 0.04m, the width h3 of each key tooth is 0.15m, the distance e1 between each wedge-shaped key tooth 4 and the edge of the box-shaped UHPC pressed component 1 is 0.3m, and each edge is provided with 3 wedge-shaped key teeth 4.
In this embodiment, the sectional shape of the inner cavity of the box-shaped UHPC pressure-receiving member 1 is a square shape provided with chamfers, the side lengths a1 and a2 of the box-shaped UHPC pressure-receiving member 1 are 1.5m, the wall thicknesses b1 and b2 are 0.15m, and the chamfer sizes h1 and h2 are 0.15 m.
In this embodiment, the steel box girder joint 2 has a hollow structure, the cross-sectional shape of the steel box girder joint 2 is a square shape provided with chamfers, the side lengths a5 and a6 of the steel box girder joint 2 are 0.9m, the length w3 is 0.6m, the thicknesses b4 and b9 of the steel plates are 15mm, the chamfer sizes h4 and h5 are 0.15m, and the width b5 of the connecting surface is 0.115 m.
In this embodiment, the outer surface of the steel box girder joint 2 is provided with a plurality of uniformly distributed studs 5, the end of the box-shaped UHPC compression member 1 is provided with a plurality of longitudinal ribs 6 extending outwards, and the corresponding longitudinal ribs 6 between the adjacent box-shaped UHPC compression members 1 are staggered and closely arranged. The pin 5 has a nominal diameter of 13mm and a post-weld length design of 90 mm. 5 rows of pins 5 are transversely arranged on the outer surface of each straight edge of the steel box girder joint 2, 1 row of pins 5 are longitudinally arranged on the part extending out of the box-shaped UHPC compression member 1, and 4 rows of pins 5 are longitudinally arranged in the box-shaped UHPC compression member 1 and are pre-embedded. The outer surface of each chamfer of the steel box girder joint 2 is transversely provided with 1 row of pins 5, the part extending out of the box-shaped UHPC compression member 1 is longitudinally provided with 1 row of pins 5, and the part embedded in the box-shaped UHPC compression member 1 is longitudinally provided with 4 rows of pins 5. The distance e2 between the pegs 5 in the transverse direction of the protruding section 21 is 0.18m, the distance e4 between the pegs 5 in the longitudinal direction is 0.11m, and the distance e3 between the pegs 5 and the connecting surface 22 at the protruding section 21 is 60 mm. The diameter of the longitudinal bars 6 is 18mm, the distance between the longitudinal bars 6 is 200mm, the diameter of the stirrups is 10mm, the distance between the stirrups is 120mm, and 2 stirrups are bound on the longitudinal bars 6.
As shown in fig. 14, in this embodiment, a UHPC casting layer 8 is disposed on the outer surface of a pair of steel box girder joints 2 between adjacent box-shaped UHPC compression members 1, and the UHPC casting layer 8 is flush with the outer surface of the box-shaped UHPC compression member 1.
The preparation method of the embodiment is similar to the embodiment 1, and the specific process refers to the embodiment 1.
Claims (10)
1. A connecting structure for an assembled box-shaped UHPC compression member is characterized by comprising a pair of adjacently arranged box-shaped UHPC compression members (1) and a pair of steel box beam joints (2) arranged between the adjacent box-shaped UHPC compression members (1), wherein the pair of steel box beam joints (2) are respectively connected with the pair of box-shaped UHPC compression members (1); one end of the steel box girder joint (2) is pre-buried and attached to an inner cavity of the box-shaped UHPC compression member (1), the other end of the steel box girder joint extends to the outside of the box-shaped UHPC compression member (1) to form an extension section (21), a connection surface (22) is arranged at the end part of the extension section (21), and a plurality of through holes (23) are formed in the connection surface (22); it is adjacent connect face (22) laminating setting, and adjacent through-hole (23) one-to-one on connecting face (22), it is adjacent connect face (22) through locating coupling assembling (9) in through-hole (23) and connect.
2. The connection structure for the assembled box-shaped UHPC compression member as claimed in claim 1, wherein the length of the protruding section (21) is 0.1-1m, the connection surface (22) is perpendicular to the protruding section (21), and the outer edge of the connection surface (22) does not exceed the outer surface of the protruding section (21).
3. Connection structure for assembled box-shaped UHPC stressed components according to claim 1, characterised in that the internal cavity of the steel box girder joint (2) is provided with a plurality of trapezoidal steel stiffeners (3), one end of said trapezoidal steel stiffeners (3) resting on said connection surface (22); be located be equipped with through-hole (23) between adjacent trapezoidal steel stiffening rib (3) on the same edge of steel box girder joint (2), and be located 3 are no less than to the quantity of trapezoidal steel stiffening rib (3) on the same edge of steel box girder joint (2).
4. A connection construction for assembled box-shaped UHPC compression elements according to claim 3 characterised in that the ladder steel stiffeners (3) have a height a7 of 0.2-1m, a long base b6 of 0.05-0.4m, a short base b7 of 0.02-0.2m and a thickness b8 of 0.01-0.08 m; the distance w1 between adjacent trapezoidal steel stiffening ribs (3) on the same edge of the steel box girder joint (2) is 0.1-0.8 m; the long bottom edge of the trapezoidal steel stiffening rib (3) is abutted to the connecting surface (22).
5. The connecting structure for the assembled box-shaped UHPC pressure-bearing member as claimed in claim 1, characterized in that the end part of four sides of the box-shaped UHPC pressure-bearing member (1) is provided with a plurality of wedge-shaped key teeth (4) which are uniformly distributed in a protruding way, the outer side length a3 of each wedge-shaped key tooth (4) is 0.2-0.6m, the inner side length a4 is 0.1-0.4m, the thickness b3 of each key tooth is 0.03-0.1m, the width h3 of each key tooth is 0.1-1m, and the distance e1 of each wedge-shaped key tooth (4) from the edge of the box-shaped UHPC pressure-bearing member (1) is 0.2-1 m.
6. A connection construction for assembled box-shaped UHPC compression members according to any one of claims 1-5, characterized in that the cross-sectional shape of the inner cavity of the box-shaped UHPC compression member (1) is square provided with chamfers, the side length a1, a2 of the box-shaped UHPC compression member (1) is 1.0-8m, the wall thickness b1, b2 is 0.1-1m, and the chamfer dimension h1, h2 is 0.1-1 m.
7. The connection structure for the assembled box-shaped UHPC compression member according to any one of claims 1-5, characterized in that the steel box girder joint (2) is a hollow structure, the cross-sectional shape of the steel box girder joint (2) is a square provided with chamfers, the side length a5, a6 of the steel box girder joint (2) is 0.6-7.6m, the length w3 is 0.4-4m, the steel plate thickness b4, b9 is 10-80mm, the chamfer dimension h4, h5 is 0.1-0.5m, and the width b5 of the connection surface is 0.06-0.5 m.
8. A connection construction for assembled box-shaped UHPC compression members according to any one of claims 1-5, characterized in that the outer surface of the steel box beam joint (2) is provided with a plurality of uniformly distributed studs (5), the end of the box-shaped UHPC compression member (1) extends outwards and is provided with a plurality of longitudinal ribs (6), and the corresponding longitudinal ribs (6) between the adjacent box-shaped UHPC compression members (1) are arranged closely and alternately.
9. The connecting structure for the assembled box-shaped UHPC compression members as claimed in any one of claims 1-5, wherein a UHPC pouring layer (8) is arranged between adjacent box-shaped UHPC compression members (1) and on the outer surfaces of a pair of steel box beam joints (2), and the UHPC pouring layer (8) is flush with the outer surfaces of the box-shaped UHPC compression members (1).
10. A construction method for a connection structure of an assembled box-shaped UHPC compression member is characterized by comprising the following steps:
s1: prefabricating a box-shaped UHPC compression member (1) in a factory, and pre-burying a steel box girder joint (2) while prefabricating the box-shaped UHPC compression member (1) so that the box-shaped UHPC compression member (1) and the steel box girder joint (2) form a whole;
s2: fixing one box-shaped UHPC (ultra high performance) compression member (1), hoisting the adjacent box-shaped UHPC compression members (1) in place, enabling the connection surfaces (22) of the steel box girder joints (2) on the two adjacent box-shaped UHPC compression members (1) to be attached, aligning the through holes (23), and fixedly connecting the two adjacent connection surfaces (22) through the through holes (23) by using a connecting assembly (9) to complete temporary connection;
s3: binding longitudinal bars (6) between two adjacent box-shaped UHPC (ultra high performance concrete) stressed members (1) by using stirrups, erecting an outer-coated template (7) at the position of a joint (2) of two adjacent steel box beams, pouring UHPC, maintaining, and removing the outer-coated template (7) after maintaining, thereby finishing the fixed connection between the adjacent box-shaped UHPC stressed members (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010072140.5A CN111172854A (en) | 2020-01-21 | 2020-01-21 | Connecting structure for assembled box-shaped UHPC compression member and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010072140.5A CN111172854A (en) | 2020-01-21 | 2020-01-21 | Connecting structure for assembled box-shaped UHPC compression member and construction method thereof |
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| CN111172854A true CN111172854A (en) | 2020-05-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113668370A (en) * | 2021-09-15 | 2021-11-19 | 中建三局第一建设工程有限责任公司 | Prefabricated pier and construction method thereof |
| CN114263570A (en) * | 2021-11-25 | 2022-04-01 | 湖南大学 | Thin-wall segment of assembled UHPC fan tower, whole-ring UHPC cylinder segment and fan tower construction method |
-
2020
- 2020-01-21 CN CN202010072140.5A patent/CN111172854A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113668370A (en) * | 2021-09-15 | 2021-11-19 | 中建三局第一建设工程有限责任公司 | Prefabricated pier and construction method thereof |
| CN113668370B (en) * | 2021-09-15 | 2024-04-26 | 中建三局第一建设工程有限责任公司 | Prefabricated bridge pier and construction method thereof |
| CN114263570A (en) * | 2021-11-25 | 2022-04-01 | 湖南大学 | Thin-wall segment of assembled UHPC fan tower, whole-ring UHPC cylinder segment and fan tower construction method |
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