A bridge pier column and friction type pier column dry joint structure for a special passage for small passenger cars

Abstract

The present invention discloses a pier column of a bridge for a special passage for small passenger cars, comprising a pipe pile, a cap, a pier column and a cap beam; its joint structure adopts a hollow prefabricated pier column, and the main reinforcement distributed vertically in the pier column comprises a prestressed steel rod; the prefabricated I-shaped cap beam comprises a vertical web plate, an upper wing plate, a lower wing plate and an inner reinforcement; the middle part of the lower wing plate is connected to the pier column correspondingly, and the lower wing plate is provided with a first prefabricated hole corresponding to the locking section, and the vertical web plate is provided with a second prefabricated hole; wherein, the locking section comprises a first locking section and a second locking section, the first locking section passes through the first prefabricated hole, and the free end of the first locking section is also screwed with a pre-tightening nut, and the pre-tightening nut locks the pier column and the cap beam to provide bearing capacity; the second locking section extends into the second prefabricated hole and is poured into the second prefabricated hole.

Description

Technical Field

[0001] The invention relates to a bridge structure, in particular to a bridge pier column for a special passage for passenger cars and a friction type cap beam concrete pier column dry joint structure. Background Art

[0002] With the promotion and application of green building and assembly concepts in the bridge field, precast concrete piers are becoming more and more widely used. One of the key technologies of precast and assembled piers in the bridge industry is joint processing.

[0003] Since the 21st century, the number of passenger cars in my country has grown rapidly. With the introduction of the "Engineering Technical Standards for Passenger Car-only Expressways", passenger car-only lanes are gradually being promoted in my country. Compared with ordinary expressways, the lane load of passenger car-only lanes is equivalent to 0.4 times that of highway-I level; the total vehicle load weight is 30T, which is 0.55 times the highway-I level vehicle load of 55T. The reduction of design load makes it possible to make the bridge structure lighter and more assembled.

[0004] Conventional municipal bridge substructures often use solid square column piers connected to solid rectangular cap beams. In recent years, prefabrication and assembly have been realized in some areas. The original cast-in-place structure is prefabricated in sections and blocks, and then hoisted into place. Due to the large size of the structure and the weight limit of construction machinery, high piers or wide cap beams often need to be prefabricated and hoisted in several sections, which seriously affects the construction period and increases the project cost (the amount of materials increases instead of decreasing, and the number of construction processes increases). Therefore, the substructure type of conventional highway bridges is no longer suitable for bridges dedicated to passenger car passages.

[0005] Factory prefabricated structures have the advantages of high construction precision and guaranteed structural quality. The structural section is no longer restricted to the solid-belly structure suitable for large-scale on-site casting. It can adopt a structural shape that saves materials, has lighter lifting weight and better stress resistance. Summary of the invention

[0006] The present invention provides a passenger car dedicated channel bridge pier and friction type cap beam concrete pier dry joint structure to solve the above technical problems.

[0007] In order to achieve the above-mentioned object, the present invention provides a friction type pier column dry joint structure of a bridge pier column for a dedicated passage for passenger cars, comprising:

[0008] A prefabricated pipe pile, wherein the upper end of the prefabricated pipe pile protrudes vertically from a first connecting steel bar;

[0009] A cast-in-place or prefabricated cap, wherein the first connecting steel bar extends from the lower bottom surface of the cap into the cap and is cast in the cap;

[0010] A hollow prefabricated pier column, wherein the main reinforcement vertically distributed in the pier column comprises a prestressed steel bar, wherein the prestressed steel bar comprises a locking section protruding from the upper surface of the pier column, wherein the free end of the locking section is provided with an external thread, wherein a second connecting steel bar protrudes from the lower bottom surface of the pier column, wherein the second connecting steel bar extends into the pier from the upper bottom surface of the pier and is cast in the pier;

[0011] The prefabricated I-shaped cap beam comprises a vertical web, an upper wing plate, a lower wing plate and internal reinforcement; the middle portion of the lower wing plate is connected to the pier column, the lower wing plate is provided with a first prefabricated hole corresponding to the locking section, and the vertical web is provided with a second prefabricated hole;

[0012] Wherein, the locking section includes a first locking section corresponding to the first prefabricated hole and a second locking section corresponding to the second prefabricated hole, the length of the second locking section is greater than the length of the first locking section, the first locking section passes through the first prefabricated hole, and a pre-tightening nut is also screwed on the free end of the first locking section, and the pre-tightening nut locks the pier and the cap beam to provide bearing capacity; the second locking section extends into the second prefabricated hole and is filled in the second prefabricated hole.

[0013] Furthermore, an embedded sleeve is provided in the first prefabricated hole, and a gap is formed between the first locking section and the embedded sleeve; a corrugated pipe is provided in the second prefabricated hole for the second locking section to penetrate, and the second prefabricated hole is filled with grouting material.

[0014] Furthermore, an inclined chamfered structure is formed between the edge of the upper wing plate and the web, and the thickness of the upper wing plate gradually increases in a direction approaching the web.

[0015] Furthermore, the cross-section of the lower wing plate is square, and the lower wing plate includes lower wing standard sections located at both ends and a pier connection part located in the middle and having a width greater than the lower wing standard section; the width of the upper wing plate is greater than the width of the lower wing standard section, and is less than or equal to the width of the pier connection part; the thickness of the pier connection part is greater than the thickness of the next standard section; wherein the first prefabricated hole and the second prefabricated hole are both opened on the pier connection part.

[0016] Furthermore, the upper wing plate and the lower wing plate at the end of the cap beam are connected by an inclined panel.

[0017] Furthermore, the pier is a hollow structure with a square outside and a round inside; the prestressed steel rods are arranged along the square side surfaces of the pier.

[0018] Furthermore, the pier cap is provided with a docking hole and an embedded sleeve corresponding to the second connecting steel bar of the pier, and the second connecting steel bar is connected to the cap by grouting and filling the embedded sleeve with dried concrete.

[0019] Furthermore, the upper surface of the pier column and the bottom surface of the cap beam are respectively provided with shear keys and shear grooves that cooperate with each other.

[0020] Furthermore, the top of the prefabricated pipe pile is a solid structure, and the first connecting steel bars are arranged in a trumpet shape.

[0021] The present invention also provides a bridge pier for a dedicated passage for small passenger cars, comprising a pipe pile, a cap, a pier and a cap beam, wherein the pipe pile, the cap, the pier and the cap beam adopt a joint structure as described in any of the above items.

[0022] Compared with the relevant technology, the technical scheme adopted in the present invention has at least the following beneficial effects: the pipe piles, abutments, piers and cap beams are made by combining cast-in-place and prefabrication, and have high manufacturing precision; the prefabricated I-shaped cap beam is lighter and easier to hoist than the existing rectangular cap beam; the prefabricated piers adopt an outer square and inner circle cross-section, which is conducive to centrifugal forming and prefabrication construction in the factory; the cap beam and the pier are connected by prestressed steel rods, wherein the free end of the first locking section of the prestressed steel rod is also screwed with a pretightening nut, and the pretightening nut locks the pier and the cap beam to provide bearing capacity; the second locking section of the prestressed steel rod extends into the second prefabricated hole on the cap beam and is filled in the second prefabricated hole, and the connecting structure is stable and the construction is simple; in addition, the whole has the advantages of low cost, convenient local materials, and easy to be widely promoted and used. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the bridge piers of the dedicated channel for passenger cars in one embodiment of the present invention.

[0024] Figure 2 for Figure 1 Schematic diagram of the internal reinforcement connection structure of the bridge piers for the dedicated channel for small and medium-sized passenger vehicles.

[0025] Figure 3 It is a schematic structural diagram of a cap beam in one embodiment of the present invention.

[0026] Figure 4 for Figure 1 Schematic diagram of the structure of the cross section at the middle part of the pier at the joint of the bridge pier for the special passage for small and medium-sized passenger vehicles.

[0027] Figure 5 for Figure 1 Schematic diagram of the structure of the cross section at the joint of the pier and the web of the cap beam of the bridge pier for the dedicated passage for small and medium-sized passenger vehicles.

[0028] Figure 6 It is a schematic structural diagram of the upper surface of a pier column in one embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] Please refer to Figure 1-6 , is a schematic diagram of a bridge pier for a dedicated passage for passenger cars and its friction-type pier dry joint structure in one embodiment of the present invention.

[0035] The pier of the bridge of the dedicated passage for small passenger cars includes a pipe pile 10 , a cap 20 , a pier 30 and a cap beam 40 .

[0036] The upper end of the prefabricated pipe pile 10 protrudes vertically from the first connecting steel bar 11 .

[0037] The pedestal 20 is cast-in-place or prefabricated, and the first connecting steel bar 11 extends into the pedestal 20 from the lower bottom surface (not numbered in the figure) of the pedestal 20 and is cast in the pedestal 20.

[0038] The pier 30 is a hollow prefabricated structure, and the main reinforcement (not numbered in the figure) distributed vertically in the pier 30 includes a prestressed steel rod 31, and the prestressed steel rod 31 includes a locking section 311 protruding from the upper surface (not numbered in the figure) of the pier 30, and the free end of the locking section 311 is provided with an external thread (as shown in the figure), and a second connecting steel bar protrudes from the lower bottom surface (not numbered in the figure) of the pier 30, and the second connecting steel bar extends into the pedestal 20 from the upper bottom surface (not numbered in the figure) of the pedestal 20 and is cast in the pedestal 20.

[0039] The prefabricated I-shaped cap beam 40 includes a vertical web 41, an upper wing plate 42, a lower wing plate 43 and internal reinforcement (not shown); the middle part of the lower wing plate 43 is connected to the pier 30, and the lower wing plate 43 is provided with a first prefabricated hole 431 corresponding to the locking section 311, and the vertical web 41 is provided with a second prefabricated hole 432. Among them, the locking section 311 includes a first locking section (not numbered in the figure) corresponding to the first prefabricated hole 431 and a second locking section (not numbered in the figure) corresponding to the second prefabricated hole 432, the length of the second locking section is greater than the length of the first locking section, the first locking section passes through the first prefabricated hole 431, and a pre-tightening nut (not numbered in the figure) is also screwed on the free end of the first locking section, and the pre-tightening nut locks the pier 30 and the cap beam 40 to provide bearing capacity, and the first locking section and the cap beam 40 may be non-bonded; the second locking section extends into the second prefabricated hole 432 and is filled in the second prefabricated hole 432.

[0040] In the present technical solution, because the prestressed steel rods 31 in the piers of the bridge for the dedicated passage for passenger cars are tightened by the pre-tightening nuts on the middle part of the lower wing plate 43 of the cap beam 40 (i.e., the pre-tightening force is applied), there is a bearing capacity (friction force) between the upper and lower parts of the friction-type pier stem joint structure to resist horizontal sliding, so it is named "friction-type pier stem joint" in the present technical solution.

[0041] In a preferred embodiment, an embedded sleeve (not shown) may be provided in the first prefabricated hole 431, a gap is always formed between the first locking section and the embedded sleeve, and there is no bonding between the first locking section and the cap beam 40.

[0042] In addition, a corrugated tube (not numbered in the figure) is provided in the second prefabricated hole 432 for the second locking section to penetrate, and the second prefabricated hole 432 is densely filled with grouting material. Since there is no tensioning space in the second locking section of the prestressed steel bar 31 corresponding to the position of the vertical web 41, grouting is used; however, the first locking section of the prestressed steel bar 31 is not filled, providing a certain tensioning force space, which is conducive to the stability of the result.

[0043] Optionally, in a specific example, an inclined chamfered structure is formed between the edge of the upper wing plate 42 and the web 41 , and the thickness of the upper wing plate 42 gradually increases in a direction approaching the web 41 .

[0044] The cross-section of the lower wing plate 43 may be square, and the lower wing plate 43 may include lower wing standard sections 411, 413 at both ends and a pier connection portion 412 located in the middle and having a width greater than that of the lower wing standard sections 411, 413; the width of the upper wing plate 42 is greater than that of the lower wing standard sections 411, 413, and is less than or equal to the width of the pier connection portion 412; the first prefabricated hole 431 and the second prefabricated hole 432 are both opened on the pier connection portion 412.

[0045] Furthermore, the upper wing plate 42 and the lower wing plate 43 are connected at the end 44 of the cap beam 40 via an inclined plate (not numbered in the figure).

[0046] In a preferred embodiment, the pier 30 is a hollow structure with a square outer side and a circular inner side, specifically including a square hollow pier 32 and an inner circular cavity 33 ; the prestressed steel rods 31 are arranged along the square side of the pier 30 .

[0047] Optionally, the cap 20 is provided with a butt-joint hole (not numbered in the figure) and an embedded sleeve (not shown in the figure) corresponding to the second connecting steel bar of the pier 30, and the second connecting steel bar is connected to the cap 20 by grouting and filling the embedded sleeve with dried concrete. Specifically, the second connecting steel bar can be formed by the prestressed steel rod 31 extending from the lower bottom surface of the pier; or it can be formed by other main bars extending from the lower bottom surface of the pier 30.

[0048] In a preferred embodiment, the upper surface of the pier column and the bottom surface of the cap beam are respectively provided with shear keys 34 and shear grooves that cooperate with each other.

[0049] In a preferred embodiment, the top of the prefabricated pipe pile 10 is a solid structure, and the first connecting steel bars 11 are arranged in a trumpet shape.

[0050] Compared with the related art, the technical solution adopted by the present invention has at least the following beneficial effects:

[0051] 1. The pipe piles, caps, piers and cap beams are cast in situ and prefabricated, with high manufacturing precision; the prefabricated I-shaped cap beam is lighter and easier to hoist than the existing rectangular cap beam;

[0052] 2. The pile cap is used to connect the pipe pile and the pier column, and the total length is divided into two sections, which reduces the difficulty of construction;

[0053] 3. The cap beam and the pier column are connected by a prestressed steel rod, wherein the free end of the first locking section of the prestressed steel rod is also screwed with a pre-tightening nut, and the pre-tightening nut locks the pier column and the cap beam to provide bearing capacity; the second locking section of the prestressed steel rod extends into the second prefabricated hole on the cap beam and is filled in the second prefabricated hole, so that the connection structure is stable and the construction is simple;

[0054] 4. In addition, the overall method has the advantages of low cost, convenient local material acquisition, and easy to be widely promoted and used.

[0055] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A friction type pier column dry joint structure of a bridge pier column for a special passage for passenger cars, characterized in that: include: A prefabricated pipe pile, wherein the upper end of the prefabricated pipe pile protrudes vertically from a first connecting steel bar; A cast-in-place or prefabricated cap, wherein the first connecting steel bar extends from the lower bottom surface of the cap into the cap and is cast in the cap; A hollow prefabricated pier column, wherein the main reinforcement vertically distributed in the pier column comprises a prestressed steel bar, wherein the prestressed steel bar comprises a locking section protruding from the upper surface of the pier column, wherein the free end of the locking section is provided with an external thread, wherein a second connecting steel bar protrudes from the lower bottom surface of the pier column, wherein the second connecting steel bar extends into the pier from the upper bottom surface of the pier and is cast in the pier; The prefabricated I-shaped cap beam comprises a vertical web, an upper wing plate, a lower wing plate and internal reinforcement; the middle portion of the lower wing plate is connected to the pier column, the lower wing plate is provided with a first prefabricated hole corresponding to the locking section, and the vertical web is provided with a second prefabricated hole; Wherein, the locking section includes a first locking section corresponding to the first prefabricated hole and a second locking section corresponding to the second prefabricated hole, the length of the second locking section is greater than the length of the first locking section, the first locking section passes through the first prefabricated hole, and a pre-tightening nut is also screwed on the free end of the first locking section, and the pre-tightening nut locks the pier and the cap beam to provide bearing capacity; the second locking section extends into the second prefabricated hole and is filled in the second prefabricated hole.

2. The friction type pier column dry joint structure according to claim 1, characterized in that: An embedded sleeve is arranged in the first prefabricated hole, and a gap is formed between the first locking section and the embedded sleeve; a corrugated pipe is arranged in the second prefabricated hole for the second locking section to penetrate, and the second prefabricated hole is filled with grouting material.

3. The friction type pier column dry joint structure according to claim 1, characterized in that: An inclined chamfered structure is formed between the edge of the upper wing plate and the web plate, and the thickness of the upper wing plate gradually increases in a direction approaching the web plate.

4. The friction type pier column dry joint structure according to claim 1, characterized in that: The cross-section of the lower wing plate is square, and the lower wing plate includes lower wing standard sections located at both ends and a pier-column connecting portion located in the middle and having a width greater than that of the lower wing standard section; the width of the upper wing plate is greater than that of the lower wing standard section, and is less than or equal to the width of the pier-column connecting portion; the thickness of the pier-column connecting portion is greater than that of the lower wing standard section; wherein the first prefabricated hole and the second prefabricated hole are both opened on the pier-column connecting portion.

5. The friction type pier column dry joint structure according to claim 4, characterized in that: The upper wing plate and the lower wing plate at the end of the cap beam are connected by an inclined plate.

6. The friction type pier column dry joint structure according to claim 1, characterized in that: The pier is a hollow structure with a square outside and a round inside; the prestressed steel rods are arranged along the square side of the pier.

7. The friction type pier column dry joint structure according to claim 1, characterized in that: The cap is provided with a butt-jointing hole and an embedded sleeve corresponding to the second connecting steel bar of the pier column, and the second connecting steel bar is connected to the cap by grouting and filling the embedded sleeve with dried concrete.

8. The friction type pier column trunk joint structure according to any one of claims 1 to 7, characterized in that: The upper surface of the pier column and the bottom surface of the cap beam are respectively provided with shear keys and shear grooves that cooperate with each other.

9. The friction type pier column stem joint structure according to any one of claims 1 to 7, characterized in that: The top of the prefabricated pipe pile is a solid structure, and the first connecting steel bars are arranged in a trumpet shape.

10. A pier column of a bridge for a special passage for small passenger cars, comprising a pipe pile, a cap, a pier column and a cap beam, characterized in that: The friction type pier dry joint structure as described in any one of claims 1 to 9 is used between the pipe piles, the abutments, the piers and the cap beams.

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