CN113215951A - Inclined leg-arch combined self-balancing integral rigid frame and construction method - Google Patents
Inclined leg-arch combined self-balancing integral rigid frame and construction method Download PDFInfo
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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
- E01D12/00—Bridges characterised by a combination of structures not covered as a whole by a single one of groups E01D2/00 - E01D11/00
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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
- E01D19/00—Structural or constructional details of bridges
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
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- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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Abstract
本发明专利公布了一种斜腿‑拱组合刚构自平衡整体刚构架及施工方法，该整体刚构架包括上部结构、下部结构和附属结构；上部结构包含预应力钢筋混凝土箱形梁、钢筋混凝土斜腿‑拱组合结构；下部结构包含钢筋混凝土矩形截面边斜杆、轻型桥台、承台及UHPC‑RC柔性阶梯桩基础；附属结构包含钢制栏杆、桥面铺装及桥台搭板。斜腿‑拱组合结构有效降低了承台处的水平推力；桥台的重力通过边斜杆传递至承台处，重力产生的水平推力有效平衡了斜腿‑拱组合结构带来的水平推力；整体设计提高了桥梁的整体性，实现了桥面连续，无接缝，提高车辆行驶舒适度；基础采用超高性能混凝土桩与普通混凝土桩相结合的阶梯桩，利用其具有超强抗压强度和一定抗拉强度的特点。
The patent of the present invention discloses a self-balancing integral rigid frame of an inclined leg-arch composite rigid frame and a construction method. The integral rigid frame includes an upper structure, a lower structure and an auxiliary structure; the upper structure includes a prestressed reinforced concrete box beam, a reinforced concrete The inclined leg-arch composite structure; the substructure includes reinforced concrete rectangular cross-section side diagonal rods, light bridge abutments, caps and UHPC-RC flexible stepped pile foundations; auxiliary structures include steel railings, bridge deck pavement and abutment decking. The inclined leg-arch combined structure effectively reduces the horizontal thrust at the platform; the gravity of the bridge abutment is transmitted to the platform through the side inclined rods, and the horizontal thrust generated by gravity effectively balances the horizontal thrust brought by the inclined leg-arch combined structure; the overall The design improves the integrity of the bridge, realizes the bridge deck is continuous, without joints, and improves the driving comfort of the vehicle; the foundation adopts the step pile combined with the super high performance concrete pile and the ordinary concrete pile, and uses its super compressive strength and certain tensile strength characteristics.
Description
Technical Field
The invention belongs to the technical field of bridge engineering in civil engineering, and particularly relates to an inclined leg-arch combined self-balancing integral rigid frame and a construction method.
Background
The inclined leg rigid frame can be regarded as a combination of a continuous girder bridge and an arch bridge, and compared with the continuous girder bridge and the rigid frame bridge, the inclined pier invisibly applies a prestress to the midspan, and the stress is reasonable and simple. Compared with an arch bridge, the arch bridge saves the building on the arch, and simultaneously embodies the advantages of the continuous beam bridge and the arch bridge.
However, the inclined leg rigid frame bridge can generate larger horizontal thrust at the bearing platform, has higher requirements on the foundation and is not suitable for the actual situation of the soft foundation in vast rural areas.
Disclosure of Invention
The invention aims to provide an inclined leg-arch combined self-balancing integral rigid frame and a construction method thereof, and solves the technical problems that an inclined leg rigid frame bridge in the existing bridge engineering field generates larger horizontal thrust at the foundation and is not suitable for the actual situation of the weak foundation of the vast land in China.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a slant leg-arch combined self-balancing integral rigid frame comprises an upper structure, a lower structure and an auxiliary structure;
the upper structure comprises a reinforced concrete inclined leg-arch combined structure and a prestressed reinforced concrete single-chamber box beam arranged on the reinforced concrete inclined leg-arch combined structure; the lower structure comprises two reinforced concrete rectangular section side inclined rods, two light bridge abutments, two bearing platforms and at least two UHPC-RC flexible stepped pile foundations; the lower end of each bearing platform is fixedly connected with a corresponding UHPC-RC flexible stepped pile foundation, and the upper end of each bearing platform is integrally Y-shaped with an inclined leg and an inclined rod at the side of the reinforced concrete inclined leg-arch combined structure, which correspond to one side, and the inclined rod at the side of the reinforced concrete rectangular section; each light bridge abutment is fixedly arranged at the upper end of the corresponding reinforced concrete rectangular section side diagonal rod; two ends of the prestressed reinforced concrete single-chamber box beam are respectively lapped on the corresponding light bridge abutments;
the auxiliary structure comprises a steel railing, a bridge deck pavement and two abutment butt straps; one end of each abutment butt strap is lapped on the corresponding light abutment, the other end of each abutment butt strap is connected with the roadbed, the bridge deck pavement is paved on the prestressed reinforced concrete single-chamber box beam and the abutment butt strap, and the steel railings are arranged on two sides of the prestressed reinforced concrete single-chamber box beam.
Further optimizing, the UHPC-RC flexible stepped pile foundation comprises an UHPC section pile foundation and an RC section pile foundation, and the UHPC section pile foundation and the RC section pile foundation are fixedly connected through a welded reinforcement cage and cast-in-place construction;
two UHPC-RC flexible stepped pile foundations are arranged under each bearing platform along the length direction of the vertical prestressed reinforced concrete single-chamber box beam.
Further optimizing, the reinforced concrete rectangular section side diagonal rod is fixedly connected with the light bridge abutment through welding a reinforcement cage and cast-in-place construction; the reinforced concrete rectangular section side diagonal rod is fixedly connected with the bearing platform through a welded reinforcement cage and cast-in-place construction; and the UHPC-RC flexible stepped pile foundation is fixedly connected with the bearing platform through welding a reinforcement cage and cast-in-place construction.
Further preferably, the prestressed reinforced concrete single-chamber box beam of the rigid frame bridge and the reinforced concrete slant leg-arch combined structure are fixedly connected by welding a reinforcement cage and cast-in-place construction.
And further optimizing, and fixedly connecting the bridge deck pavement of the rigid frame bridge and the prestressed reinforced concrete single-chamber box-shaped beam through concrete pouring after reserving connecting seams.
Further optimization, the prestressed reinforced concrete single-chamber box beam is fixedly connected with the abutment and integrally formed, and no expansion joint exists between the prestressed reinforced concrete single-chamber box beam and the abutment.
The construction method based on the oblique leg-arch combined self-balancing integral rigid frame comprises the following steps:
step one, treating a foundation, building a steel bar frame structure of a UHPC-RC flexible stepped pile foundation, and then pouring and coagulating to form the UHPC-RC flexible stepped pile foundation;
step two, building a steel bar frame structure of a bearing platform on the top of the UHPC-RC flexible stepped pile foundation, anchoring pile body steel bars into the steel bar frame for connection, and welding; then pouring and coagulating to form a bearing platform; embedding the pile head of the UHPC-RC flexible stepped pile foundation into a bearing platform by mm;
step three, constructing a reinforced concrete rectangular section side diagonal rod: the two ends of the steel bar framework structure are synchronously erected with the side diagonal rods, the steel bars reserved on the upper portion of the bearing platform are welded and fixedly connected with the steel bar framework structure, prepressing is carried out after the steel bar framework structure is erected, the steel bar framework structure is deformed in advance to reach a design position, then templates are arranged to pour concrete, and prepressing loads are gradually unloaded along with the concrete pouring process; the upper part of the side diagonal rod is reserved with a reinforcing steel bar which is fixedly connected with the abutment in the later period;
step four, constructing an abutment, an inclined leg-arch combined structure and a prestressed reinforced concrete single-chamber box beam, and synchronously constructing the inclined leg-arch combined structure and the abutment:
constructing a steel bar framework structure of the abutment, wherein the steel bar framework structure is fixedly connected with a reserved steel bar at the upper part of the side diagonal rod in a welding manner; then pouring concrete to form an abutment, and pouring concrete to connect the abutment with the steel bars reserved on the side slashes;
erecting a full-hall steel bar framework structure of an inclined leg-arch combined structure as a steel bar framework structure of the inclined leg-arch combined structure and a prestressed reinforced concrete single-chamber box beam, and then installing a bottom die and a side die of the inclined leg-arch combined structure, a bottom die and a side die of the box beam and the side die on the steel bar framework structure; the bottom die of the slant leg-arch combined structure is directly laid on the full-hall steel bar framework structure, the plane position and the elevation of the template are measured after the bottom die is installed, the accuracy of the installation position and the elevation of the template is ensured, and then the pouring closure of the slant leg-arch combined structure and the prestressed reinforced concrete single-chamber box beam is carried out by using the full-hall steel bar framework structure which is erected in advance;
and fifthly, mounting the abutment butt strap, laying a bridge deck structure, and then mounting the steel railing.
Further optimizing, setting a sand box for a concrete hinge joint between the inclined leg-arch combined structure and the bearing platform base; the slant leg-arch combined structure template is a shaped steel template, and the sand box and the slant leg template are both processed and customized according to the design size by a template factory.
Compared with the prior art, the invention has the following beneficial effects:
1. the inclined leg-arch combined rigid frame bridge has the advantages that the concrete side inclined rods are arranged, the gravity and the bearing load of the bridge abutment are transmitted to the bearing platform through the side inclined rods, the horizontal thrust generated by the inclined leg-arch combined structure at the bearing platform is balanced, and a self-balancing system is formed.
2. In the invention, the stress reinforced concrete single-chamber box beam is fixedly connected with the abutment, a common expansion joint device is eliminated, and an integral bridge form is adopted. The integral bridge is a bridge structure which cancels an expansion joint and directly concreties a beam body and an abutment. The bridge deck is continuous and seamless, the driving comfort of the vehicle is improved, the occurrence of bridge diseases is reduced, and the construction, management and maintenance cost is low. And the integral bridge can improve the capacity of bearing various disaster events, especially in the anti-seismic design of the bridge, the integral abutment is connected with the upper structure, so that the condition of beam falling can not occur, and the anti-seismic and flood-fighting capacity of the bridge is greatly improved. Meanwhile, the expansion joint with a high price is eliminated, and the economical efficiency of the bridge is greatly improved.
3. According to the slant leg-arch combined rigid frame bridge, a foundation adopts a stepped pile formed by combining an ultra-high performance concrete pile and a common concrete pile, the upper half part of the pile adopts a UHPC material, a C120 UHPC is selected, and the characteristics of ultra-high compressive strength and certain tensile strength are utilized to reduce the cross-sectional area, so that the rigidity is reduced, and the deformability is increased to meet the requirement of longitudinal deformation of the whole bridge.
4. The inclined leg-arch combined rigid frame bridge is of an integral rigid frame structure. Because the poor area of rural area has bridge flood discharge ability not enough, bearing capacity is not enough, the firm degree is low, the traffic capacity is not enough, the support life is short, the maintenance cost is high, the maintenance frequency is low, the invention avoids the support to change and maintain the quantity low, the rigid frame statically indeterminate and restrain much, the internal force is large, has solved the general shortcoming of the bridge of the poor area of rural area.
Drawings
FIG. 1 is a general schematic view of a novel bridge of the present invention;
FIG. 2 is a schematic view of the novel prestressed reinforced concrete box beam of the present invention;
FIG. 3 is a schematic view of a novel UHPC-RC compliant stairpile of the present invention;
FIG. 4 is a schematic view of the novel abutment of the present invention;
FIG. 5 is a schematic diagram of the self-balancing symmetrical construction of the integral rigid frame adopted by the invention;
FIG. 6 is a horizontal thrust diagram of a rimless diagonal leg under its own weight;
FIG. 7 is a horizontal thrust diagram of a side-legged leg under its own weight;
FIG. 8 is a maximum bending moment diagram of a steel main beam with a self-weight lower inclined leg;
FIG. 9 is a diagram of a maximum bending moment of a main beam of a combined rigid frame of a self-weight lower inclined leg-arch structure;
FIG. 10 is a schematic view of the force balance of a self-balancing system adopted by the present invention;
fig. 11 is a construction self-balancing system diagram.
Detailed Description
The technical solutions in the novel embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the novel embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the novel embodiments of the present invention, and not all embodiments.
Referring to fig. 1-5, a slant leg-arch combined self-balancing unitary rigid frame includes an upper structure, a lower structure and an attachment structure.
The upper structure comprises a reinforced concrete inclined leg-arch combined structure 2 and a prestressed reinforced concrete single-chamber box beam 1 arranged on the reinforced concrete inclined leg-arch combined structure 2; the lower structure comprises two reinforced concrete rectangular section side inclined rods 3, two light bridge abutments 4, two bearing platforms 5 and at least two UHPC-RC flexible stepped pile foundations 6; the lower end of each bearing platform 5 is fixedly connected with a corresponding UHPC-RC flexible stepped pile foundation 6, and the upper end of each bearing platform 5 is integrally Y-shaped with an inclined leg and a reinforced concrete rectangular section side inclined rod 3 at one side corresponding to the reinforced concrete inclined leg-arch combined structure 2; each light bridge abutment 4 is fixedly arranged at the upper end of the corresponding reinforced concrete rectangular section side diagonal rod 3; two ends of the prestressed reinforced concrete single-chamber box beam 1 are respectively lapped on the corresponding light bridge abutments 4;
the auxiliary structure comprises a steel railing 7, a bridge deck pavement 8 and two abutment butt straps 9; one end of each abutment butt strap 9 is lapped on the corresponding light abutment 4, the other end is connected with a roadbed, the bridge deck pavement 8 is paved on the prestressed reinforced concrete single-chamber box beam 1 and the abutment butt strap 9, and the steel railings 7 are arranged on two sides of the prestressed reinforced concrete single-chamber box beam 1.
In this embodiment, the UHPC-RC flexible stepped pile foundation 6 includes a UHPC section pile foundation 10 and an RC section pile foundation 11, and the UHPC section pile foundation 10 and the RC section pile foundation 11 are fixedly connected by welding a reinforcement cage and cast-in-place construction;
two UHPC-RC flexible stepped pile foundations 6 are arranged under each bearing platform 5 along the length direction of the vertical prestressed reinforced concrete single-chamber box beam 1.
In the embodiment, the reinforced concrete rectangular section side diagonal rod 3 is fixedly connected with the light bridge abutment 4 through a welded reinforcement cage and cast-in-place construction; the reinforced concrete rectangular section side diagonal rod 3 is fixedly connected with the bearing platform 5 through a welded reinforcement cage and cast-in-place construction; and the UHPC-RC flexible stepped pile foundation 6 is fixedly connected with the bearing platform 5 through a welded reinforcement cage and cast-in-place construction.
In this embodiment, the prestressed reinforced concrete single-chamber box beam 1 of the rigid frame bridge and the reinforced concrete slant leg-arch combined structure 2 are fixedly connected by welding a reinforcement cage and cast-in-place construction.
In the embodiment, the rigid frame bridge deck pavement 8 and the prestressed reinforced concrete single-chamber box beam 1 are fixedly connected through concrete pouring after reserved connecting joints are reserved.
In this embodiment, the prestressed reinforced concrete single-chamber box girder 1 is fixedly connected with the abutment and integrally formed, and there is no expansion joint between the two.
In this embodiment, the UHPC-RC flexible stepped pile foundation 6 is a stepped pile formed by combining an ultra-high performance concrete pile and a common concrete pile, the upper half part of the pile is made of UHPC material, and the UHPC of C120 is selected, so that the cross-sectional area is reduced by using the characteristics of ultra-high compressive strength and certain tensile strength, the rigidity is reduced, and the deformability is increased to meet the requirement of deformation in the longitudinal direction of the whole longitudinal bridge. The lower half part of the pile is made of common concrete materials and mainly bears axial force. The upper part 2m of the ladder pile is an UHPC pile, and the lower part is an RC pile. The concrete design is that 2 single-row arrangement, the diameter of the upper pile is 50cm, and the diameter of the lower pile is 100 cm.
In the embodiment, the reinforced concrete inclined leg 2 has a variable-section rectangular section, the top of the inclined leg is 3.6m wide, the toe of the inclined leg is 1.6m wide and 5.22m long, the inclined leg is 50 degrees to the horizontal line, the concrete strength grade is C50, the arch axis is parabolic, the arch ring is 35cm thick, and the rise of the inclined leg is 4.7 m.
In the embodiment, the concrete side diagonal rods 3 are reinforced concrete rectangular section plates, and the side diagonal rods are 7m long, 2.98m wide and 0.6m thick and are 45 degrees to the horizontal line. The upper part of the side sway rod is fixedly connected with the light bridge abutment, and the lower part of the side sway rod is fixedly connected with the bearing platform, so that the contact surface of the concrete side sway rod 3 is enlarged at the joint in order to avoid the stress concentration phenomenon. The upper and lower structures are connected into a whole, and all parts bear force together. The concrete side diagonal rods 3 can transfer the gravity of the bridge abutment to offset the horizontal thrust brought by the inclined leg-arch composite structure at the bearing platform, the concrete side diagonal rods 3 are essentially bending members, the component force of the pressure applied to the concrete side diagonal rods in the horizontal direction can offset part of the horizontal component force in the inclined leg-arch composite structure, the vertical component force of the concrete side diagonal rods acts on the bearing platform, the bearing platform bears large vertical pressure and small horizontal thrust, the stress of the bearing platform is obviously improved, the diagonal rods at two sides are embedded in the embankment, and the soil pressure of the concrete side diagonal rods is also favorable for reducing the unbalanced thrust of the foundation.
The abutment 4 is a light-duty abutment of a wall type, and the abutment is connected with the beam and the side diagonal rods in a consolidation mode. The lower part of the light bridge abutment is provided with a pile foundation and is filled with reinforced soil, so that the problems of temperature load, concrete shrinkage and creep and the like of the integral bridge can be better solved. The overall height of the abutment is 3 m.
The light abutment 4 is fixedly connected with the prestressed reinforced concrete single-chamber box beam 1, a connecting seam is reserved during construction, and the light abutment is fixedly connected after the beam strength reaches the standard by pouring; the bridge deck pavement 8 is paved after the strength of the whole bridge structure reaches the standard, and is fixedly connected with the bridge structure; the abutment butt strap 9 and the light abutment 4 are in lap joint, a bracket structure is arranged at the abutment back of the light abutment 4 during construction, and the abutment butt strap 9 is erected on the abutment back bracket structure.
The design scheme adopts an integral prestressed concrete inclined leg-arch combined rigid frame bridge after comparison and selection, the total span is 30m, the main span is 13.6m, and the side span is 8.2 m. The net span is 13.1m, L is more than 10 and less than 30m in bridge classification, and the bridge is a small bridge range, so the bridge is designed as a small bridge.
The cross section adopts a single-box single-chamber box-shaped structure, the box girder at the fulcrum adopts a solid section with the length of 1.606m, and the joint of the girder end and the abutment is a solid section girder with the length of 1.2 m. The height of the main span middle beam is 0.6m, the height of the side span middle beam is 0.6m, and the height of the beam at the supporting point is 1 m. The bridge deck pavement is 8cm thick waterproof concrete and 5cm thick asphalt concrete.
The construction method based on the oblique leg-arch combined self-balancing integral rigid frame comprises the following steps:
step one, treating a foundation, building a steel bar frame structure of a UHPC-RC flexible stepped pile foundation 6, and then pouring and coagulating to form the UHPC-RC flexible stepped pile foundation 6;
step two, erecting a steel bar frame structure of a bearing platform 5 on the top of the UHPC-RC flexible stepped pile foundation, anchoring pile body steel bars into the steel bar frame for connection, and welding; then pouring and coagulating to form a bearing platform; the pile head of the UHPC-RC flexible stepped pile foundation 6 is embedded into the bearing platform by 50 mm;
step three, building a reinforced concrete rectangular section side diagonal rod 3: the two ends of the steel bar framework structure are synchronously erected with the side diagonal rods, the steel bars reserved on the upper portion of the bearing platform are welded and fixedly connected with the steel bar framework structure, prepressing is carried out after the steel bar framework structure is erected, the steel bar framework structure is deformed in advance to reach a design position, then templates are arranged to pour concrete, and prepressing loads are gradually unloaded along with the concrete pouring process; the upper part of the side diagonal rod is reserved with a reinforcing steel bar which is fixedly connected with the abutment 4 in the later period;
step four, constructing an abutment 4, an inclined leg-arch combined structure 2 and a prestressed reinforced concrete single-chamber box beam 1, and synchronously constructing the inclined leg-arch combined structure 2 and the abutment 4:
constructing a steel bar framework structure of the abutment, wherein the steel bar framework structure is fixedly connected with a reserved steel bar at the upper part of the side diagonal rod in a welding manner; then pouring concrete to form an abutment 4, and pouring concrete to connect the abutment 4 with the steel bars reserved on the side slashes;
erecting a full-hall steel bar framework structure of an inclined leg-arch combined structure as a steel bar framework structure of an inclined leg-arch combined structure 2 and a prestressed reinforced concrete single-chamber box beam 1, and then installing a bottom die and a side die of the inclined leg-arch combined structure 2, and a bottom die and a side die of the box beam and a side die on the steel bar framework structure; the bottom die of the slant leg-arch combined structure 2 is directly laid on the full-hall steel bar framework structure, the plane position and the elevation of the template are measured after the bottom die is installed, the accuracy of the installation position and the elevation of the template is ensured, and then the pouring closure of the slant leg-arch combined structure 2 and the prestressed reinforced concrete single-chamber box beam is carried out by using the full-hall steel bar framework structure which is erected in advance; the concrete hinge joint between the inclined leg-arch combined structure 2 and the bearing platform base is arranged by adopting a sand box; the inclined leg-arch combined structure 2 template is a shaped steel template, and the sand box and the inclined leg template are both processed and customized according to the design size by a template factory.
And fifthly, mounting the abutment butt strap 9, laying the bridge deck structure 8, and then mounting the steel railing 7.
Stress analysis was performed according to the model established by the midas civil finite element software as shown in fig. 6, 7, 8 and 9. Wherein fig. 6 is a model stress analysis diagram of the edgeless diagonal, the edgeless diagonal flat thrust under the dead weight: 1504.6 KN. FIG. 7 is a model stress analysis diagram of the side diagonal member of the present invention, the horizontal thrust of the side diagonal member under self weight: 82.4 KN. As shown in fig. 8, the maximum bending moment of the steel main beam with the inclined legs under the self weight of the inclined rods is as follows: 912.1KN m. As shown in fig. 9, the maximum bending moment of the main beam of the skew leg-arch combined rigid frame under the dead weight of the side skew rod is as follows: 793.5KN m. Therefore, the horizontal thrust of the inclined leg with the side under the self weight is greatly reduced, and the maximum value of the bending moment of the main beam of the inclined leg-arch combined rigid frame is also reduced by 118.6 KN/m. The inclined legs can balance horizontal thrust effectively, and the maximum bending moment of the main beam can be degraded effectively due to the arch.
By designing the side inclined rod, the gravity of the bridge abutment is transferred to the bearing platform 5, the horizontal thrust caused by the inclined legs at the bearing platform is balanced, a self-balancing structural system is formed, and the accepted balance analysis is shown in figures 10 and 11. Fig. 11 shows the stress analysis diagram of the self-balancing system in the process. After the synchronous construction of the abutment inclined leg-arch combined structure is completed, the bending moment borne by the pile bottom is 1.2KN m and is close to 0, and the horizontal force of the pile top is reasonably close to the correctness of a balance verification self-balancing system. Effectively adapting to the condition of soft soil foundation.
In conclusion, the inclined leg-arch combined rigid frame bridge has the advantages that the requirement of the bridge on the foundation is reduced by arranging the side inclined rods, the lightweight design of the abutment is also carried out after the side inclined rods are arranged, the bearing capacity and the spanning capacity are ensured on the basis of saving expenses, the gravity of the abutment is transmitted to the bearing platform (5) by the design of the side inclined rods, and the horizontal thrust generated by the inclined leg-arch combined rigid frame at the bearing platform (5) is balanced; the whole bridge is designed into an integral bridge, an expansion joint device commonly used is omitted, the bridge floor is continuous and seamless, the driving comfort level of a vehicle is improved, the occurrence of bridge diseases is reduced, and the cost for construction, management and maintenance is low. The capacity of bearing various calamity events of bridge is improved, in bridge anti-seismic design, because integral abutment links together with superstructure, prevents to take place the condition of roof beam that falls, has improved the antidetonation flood fighting capacity of bridge. Meanwhile, the expansion joint with a high price is eliminated, and the economical efficiency of the bridge is greatly improved. The foundation adopts a stepped pile formed by combining an ultra-high performance concrete pile and a common concrete pile, the upper half part of the pile is made of UHPC material, C120 UHPC is selected, and by utilizing the characteristics of ultra-high compressive strength and certain tensile strength, a smaller cross section can be adopted, the rigidity is reduced, and the deformation capacity is increased so as to adapt to the requirement of longitudinal and bridge-direction deformation of the whole bridge.
The above description is only for the purpose of illustrating the present invention, and the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and its novel concept within the technical scope of the present invention.
Claims (8)
1. An oblique leg-arch combined self-balancing integral rigid frame is characterized in that: comprises an upper structure, a lower structure and an auxiliary structure;
the upper structure comprises a reinforced concrete inclined leg-arch combined structure (2) and a prestressed reinforced concrete single-chamber box beam (1) arranged on the reinforced concrete inclined leg-arch combined structure (2); the lower structure comprises two reinforced concrete rectangular section side inclined rods (3), two light bridge abutments (4), two bearing platforms (5) and at least two UHPC-RC flexible stepped pile foundations (6); the lower end of each bearing platform (5) is fixedly connected with a corresponding UHPC-RC flexible stepped pile foundation (6), and the upper end of each bearing platform (5) is integrally Y-shaped with an inclined leg and a reinforced concrete rectangular section side inclined rod (3) at one side corresponding to the reinforced concrete inclined leg-arch combined structure (2); each light bridge abutment (4) is fixedly arranged at the upper end of the corresponding reinforced concrete rectangular section side diagonal rod (3); two ends of the prestressed reinforced concrete single-chamber box beam (1) are respectively lapped on the corresponding light bridge abutments (4);
the auxiliary structure comprises steel railings (7), a bridge deck pavement (8) and two abutment butt straps (9); one end of each abutment butt strap (9) is lapped on the corresponding light abutment (4), the other end of each abutment butt strap is connected with a roadbed, the bridge deck pavement (8) is paved on the prestressed reinforced concrete single-chamber box beam (1) and the abutment butt strap (9), and the steel railings (7) are arranged on two sides of the prestressed reinforced concrete single-chamber box beam (1).
2. The skew leg-arch combination self-balancing unitary rigid frame of claim 1, wherein: the UHPC-RC flexible stepped pile foundation (6) comprises an UHPC section pile foundation (10) and an RC section pile foundation (11), and the UHPC section pile foundation (10) and the RC section pile foundation (11) are fixedly connected through a welded steel reinforcement cage and cast-in-place construction;
two UHPC-RC flexible ladder pile foundations (6) are arranged under each bearing platform (5) along the length direction of the vertical prestressed reinforced concrete single-chamber box beam (1).
3. The skew leg-arch combination self-balancing unitary rigid frame of claim 1, wherein: the reinforced concrete rectangular section side diagonal rod (3) is fixedly connected with the light bridge abutment (4) through a welded reinforcement cage and cast-in-place construction; the reinforced concrete rectangular section side diagonal rod (3) is fixedly connected with the bearing platform (5) through a welded reinforcement cage and cast-in-place construction; and the UHPC-RC flexible stepped pile foundation (6) is fixedly connected with the bearing platform (5) through a welded reinforcement cage and cast-in-place construction.
4. The skew leg-arch combination self-balancing unitary rigid frame of claim 1, wherein: the prestressed reinforced concrete single-chamber box beam (1) of the rigid frame bridge is fixedly connected with the reinforced concrete inclined leg-arch combined structure (2) through welding a reinforcement cage and cast-in-place construction.
5. The skew leg-arch combination self-balancing unitary rigid frame of claim 1, wherein: and the rigid frame bridge deck pavement (8) is fixedly connected with the prestressed reinforced concrete single-chamber box beam (1) through concrete pouring after a reserved connecting joint.
6. The skew leg-arch combination self-balancing unitary rigid frame of claim 1, wherein: the prestressed reinforced concrete single-chamber box beam (1) is fixedly connected with the abutment and integrally formed, and no expansion joint exists between the prestressed reinforced concrete single-chamber box beam and the abutment.
7. The construction method based on the oblique leg-arch combined self-balancing integral rigid frame in the claims 1 to 6 is characterized in that: the method comprises the following steps:
step one, treating a foundation, building a steel bar frame structure of a UHPC-RC flexible stepped pile foundation (6), and then pouring and coagulating to form the UHPC-RC flexible stepped pile foundation (6);
step two, building a steel bar frame structure of a bearing platform (5) at the top of the UHPC-RC flexible stepped pile foundation, anchoring pile body steel bars into the steel bar frame for connection, and welding; then pouring and coagulating to form a bearing platform; the pile head of the UHPC-RC flexible stepped pile foundation (6) is embedded into the bearing platform by 50 mm;
step three, constructing a reinforced concrete rectangular section side diagonal rod (3): the two ends of the steel bar framework structure are synchronously erected with the side diagonal rods, the steel bars reserved on the upper portion of the bearing platform are welded and fixedly connected with the steel bar framework structure, prepressing is carried out after the steel bar framework structure is erected, the steel bar framework structure is deformed in advance to reach a design position, then templates are arranged to pour concrete, and prepressing loads are gradually unloaded along with the concrete pouring process; the upper part of the side diagonal rod is reserved with a reinforcing steel bar which is fixedly connected with the abutment (4) in the later period;
step four, constructing an abutment (4), an inclined leg-arch combined structure 2 and a prestressed reinforced concrete single-chamber box beam (1), and synchronously constructing the inclined leg-arch combined structure (2) and the abutment (4):
constructing a steel bar framework structure of the abutment, wherein the steel bar framework structure is fixedly connected with a reserved steel bar at the upper part of the side diagonal rod in a welding manner; then pouring concrete to form an abutment (4), and pouring concrete to connect with the steel bars reserved on the side slashes;
erecting a full-hall steel bar framework structure of an inclined leg-arch combined structure as a steel bar framework structure of an inclined leg-arch combined structure (2) and a prestressed reinforced concrete single-chamber box beam (1), and then installing a bottom die and a side die of the inclined leg-arch combined structure (2), a box beam bottom die and a side die on the steel bar framework structure; the inclined leg-arch combined structure (2) is characterized in that a bottom die is directly laid on a full-hall steel bar framework structure, the plane position and the elevation of a template are measured after the bottom die is installed, the accuracy of the installation position and the elevation of the template is ensured, and then the pouring closure of the inclined leg-arch combined structure (2) and a prestressed reinforced concrete single-chamber box beam is carried out by using the full-hall steel bar framework structure which is erected in advance;
and fifthly, installing an abutment butt strap (9), paving a bridge deck structure (8), and then installing a steel railing (7).
8. A method of constructing a combined slant leg-arch self-balanced integral rigid frame as recited in claim 7, wherein: the concrete hinge joint between the inclined leg-arch combined structure (2) and the bearing platform base is arranged by adopting a sand box; the inclined leg-arch combined structure 2 template is a shaped steel template, and the sand box and the inclined leg template are both processed and customized according to the design size by a template factory.
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