CN111119053B

CN111119053B - Construction method of embedded connection structure of pier and foundation

Info

Publication number: CN111119053B
Application number: CN201811281956.8A
Authority: CN
Inventors: 庞林; 曾永平; 陶奇; 郑晓龙; 杨国静; 苏延文; 董俊; 徐昕宇; 周川江; 颜永逸
Original assignee: China Railway Eryuan Engineering Group Co Ltd CREEC
Current assignee: China Railway Eryuan Engineering Group Co Ltd CREEC
Priority date: 2018-10-30
Filing date: 2018-10-30
Publication date: 2021-05-11
Anticipated expiration: 2038-10-30
Also published as: CN111119053A

Abstract

The invention discloses a construction method of an embedded connection structure of a pier and a foundation, wherein the connection structure comprises a bracket and an expansion head which are arranged at the bottom of the pier, a cup opening which is matched with the expansion head is arranged in the foundation, the expansion head is inserted into the cup opening, the bracket is contacted with the top surface of the foundation, and concrete is poured between the expansion head and the cup opening; the construction method comprises the steps of prefabricating a first assembling part and a second assembling part of a foundation respectively; lofting the first splicing part at a design position; hoisting the pier, and pushing the expansion head of the pier into the cup mouth of the foundation from the side; aligning the limiting tenon of the second assembling part with the limiting hole of the first assembling part to ensure that the second assembling part is fixedly connected with the first assembling part; and pouring concrete, and pouring the bridge pier and the foundation into a whole, thereby completing the prefabrication and assembly.

Description

Construction method of embedded connection structure of pier and foundation

Technical Field

The invention relates to the technical field of bridge engineering, in particular to a construction method of an embedded connection structure of a pier and a foundation.

Background

The design of the bridge pier and foundation connection structure has important influence on the safety, durability and construction difficulty of the fully prefabricated bridge structure. The connection structure of the existing prefabricated bridge pier and the foundation mainly comprises an insertion type column base consolidation mode and an anchor bolt connection mode.

As shown in fig. 1, the insertion-type socle fixing method is to embed a steel plug-in member 3 in the pier 1 and the foundation 2, and to reproduce a concrete wet joint. Usually, the section area of the steel inserting component 3 is gradually decreased from top to bottom, that is, the whole is in a form of a reduced head, and the connection mode is convenient for the pier 1 to be directly inserted into the foundation 2, but has the problem of poor stability and tensile resistance. The foundation bolt connection mode has the problems that the structural integrity is not good like a cast-in-place concrete mode, the requirement on the embedded precision of the foundation bolt is high, and the fatigue resistance and the durability are relatively poor. Therefore, a connection structure of the pier and the foundation, which has high bearing capacity, strong durability, small construction difficulty and good pulling resistance, needs to be found.

Disclosure of Invention

The present invention has been made to overcome the above-mentioned disadvantages of the prior art, and an object of the present invention is to provide a method for constructing an embedded pier-foundation connection structure.

In order to achieve the above purpose, the invention provides the following technical scheme:

the utility model provides an embedded connection structure of pier and basis, includes bracket and the enlarged footing that is equipped with in the bottom of pier, be equipped with in the basis with the rim of a cup of enlarged footing looks adaptation, the enlarged footing inserts in the rim of a cup, just the bracket with the top surface of basis contacts, it has the concrete to pour into between enlarged footing and the rim of a cup.

According to the invention, the connecting member at the bottom of the pier is designed into an expanded head form (namely, the sectional area of the connecting member is gradually increased from top to bottom in the vertical direction), and compared with the traditional reduced head form (namely, the sectional area of the connecting member is gradually reduced from top to bottom in the vertical direction), the expanded head obviously has better anti-pulling performance. The expansion heads and the brackets are utilized to carry out double limiting, the bridge piers are firmly fixed in the foundation, the anti-overturning capacity, the anti-sliding capacity and the anti-pulling capacity of the structure are favorably improved, the structure size can be reduced, and the construction cost can be reduced. The whole connecting structure has the advantages of reliable force transmission, short construction period, assembly type construction and good structural integrity.

Preferably, the plane size of the bracket is larger than the opening size of the cup opening, and the bracket can compress the foundation to play a limiting role.

Preferably, the expansion head is of a platform body structure, the vertical profile of the expansion head is trapezoidal, the length of the upper bottom is smaller than that of the lower bottom, and the included angle between the waist and the lower bottom of the trapezoid is not small enough.

Preferably, the base is formed by assembling a plurality of components, so that the problem of assembly between the base and the expansion head is solved. Preferably, the foundation is formed by splicing a first splicing part and a second splicing part.

Preferably, the length of the second assembling portion is smaller than that of the base, the width of the second assembling portion is the distance from the cup opening to the edge of the base, namely the plane area of the second assembling portion is smaller, generally, the length of the second assembling portion can be only the size of the cup opening, the top surface of the first assembling portion is designed to be of a concave structure, and the second assembling portion can be directly inserted into the first assembling portion. The assembly form is beneficial to assembling the piers one by one without specially fixing the piers, so that the assembly form is more convenient; the steel bars can be configured in the whole length in two directions of the bottom of the foundation without tensioning prestressed steel bundles.

Preferably, the plan profile view of the second assembly portion is rectangular or trapezoidal.

Preferably, the first splicing part and the second splicing part are in joggle connection with each other, construction is facilitated, and connection strength is good.

Preferably, the first assembling portion is provided with a limiting hole, and the second assembling portion is provided with a limiting tenon matched with the limiting hole.

The invention also discloses a construction method of the embedded connection structure of the bridge pier and the foundation, which comprises the following steps:

the method comprises the following steps: respectively prefabricating a first assembling part and a second assembling part of the foundation;

step two: lofting the first splicing part at a design position;

step three: hoisting the pier, and pushing the expansion head of the pier into the cup mouth of the foundation from the side;

step four: aligning the limiting tenon of the second assembling part with the limiting hole of the first assembling part to ensure that the second assembling part is fixedly connected with the first assembling part;

step five: and pouring concrete, and pouring the bridge pier and the foundation into a whole, thereby completing the prefabrication and assembly.

The construction method can perfectly solve the problem of connection between the foundation and the expansion head, the assembly method is simple, the second assembly parts can be inserted into the first assembly parts one by one during assembly, special positioning of the bridge pier is not needed, prestressed steel bundles of the foundation do not need to be tensioned, the construction procedures can be greatly reduced, and the construction cost is saved.

Compared with the prior art, the connecting structure has the beneficial effects that:

according to the invention, the connecting member at the bottom of the pier is designed into the form of the expanded head, and compared with the traditional form of the reduced head, the expanded head obviously has better anti-pulling performance. The expansion head and the bracket are utilized to carry out double limiting, so that the anti-overturning capacity, the anti-sliding capacity and the anti-pulling capacity of the structure are improved, the structure size can be reduced, and the construction cost can be reduced. The whole connecting structure has the advantages of reliable force transmission, short construction period, assembly type construction and good structural integrity.

Compared with the prior art, the construction method of the connection structure has the beneficial effects that:

Description of the drawings:

fig. 1 is a schematic structural view of a connection structure between a pier and a foundation used in the prior art.

In FIG. 1, the labels: 1-bridge pier, 2-foundation and 3-steel splicing component.

Fig. 2 is a schematic structural view of an embedded connection structure of a pier and a foundation according to the present invention.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a schematic diagram of the assembly of the foundation of the present invention.

Fig. 5 is a plan view of a first sub-assembly of the foundation according to the invention.

Fig. 6 is a sectional view B-B of fig. 5.

Fig. 7 is a cross-sectional view C-C of fig. 5.

Fig. 8 is a plan view of a second sub-assembly of the foundation according to the invention.

Fig. 9 is an elevation view of a second subassembly of the foundation of the present invention.

Fig. 10 is a side view of a second subassembly of the base of the present invention.

Labeled in fig. 2-10: 1-pier, 2-foundation, 21-first assembly part, 22-second assembly part, 23-limiting hole, 24-limiting tenon, 25-cup mouth, 3-bracket and 4-enlarged head.

Detailed Description

The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.

Example 1

As shown in fig. 2-3, an embedded connection structure of pier and basis includes bracket 3 and the enlarged head 4 that is equipped with in proper order in the bottom of pier 1, be equipped with in basis 2 with enlarge the rim of a cup 25 of head 4 looks adaptation, enlarged head 4 is arranged in the rim of a cup 25, just the planar dimension of bracket 3 is greater than the opening size of rim of a cup 25, bracket 3 compresses tightly the top surface of basis 2, it has the concrete to pour into between enlarged head 4 and the rim of a cup 25.

The expansion head 4 is of a platform structure, the vertical profile of the expansion head is trapezoidal, and the length of the upper bottom is smaller than that of the lower bottom, that is, in the vertical direction, the sectional area of the expansion head 4 is gradually increased from top to bottom.

As shown in fig. 4, the foundation 2 is formed by assembling a first assembling portion 21 and a second assembling portion 22, a limiting hole 23 is formed in the first assembling portion 21, a limiting tenon 24 matched with the first assembling portion 22 is formed in the second assembling portion 22, and the first assembling portion 21 and the second assembling portion 22 are in joggle joint.

As shown in fig. 5-7, the first assembly part 21 leaves a partial area on only one side for assembly, the top surface of the first assembly part 21 presents a concave shape, and the area of the left area does not affect the arrangement of the reinforcement bars in the foundation.

As shown in fig. 8 to 10, the second assembly portion 22 has a shape that fits the area left by the first assembly portion 21, and the second assembly portion 22 is a small member having a rectangular shape in plan view. Specifically, the length L2 of the second assembly part 22 is smaller than the length L1 of the base 2, and the width B of the second assembly part 22 is the distance D from the cup opening 25 to the edge of the base 2.

Example 2

A construction method of an embedded connection structure of a pier and a foundation comprises the following steps:

the method comprises the following steps: a first split part 21 and a second split part 22 of the foundation 2 are prefabricated at the factory, respectively;

step two: mounting the first fitting portion 21 at a design position;

step three: hoisting the pier 1, and pushing the expansion head 4 of the pier 1 into the cup mouth 25 of the foundation 2 from the side;

step four: aligning the limiting tenon 24 of the second assembling part 22 with the limiting hole 23 of the first assembling part 21 so that the second assembling part 22 is connected and fixed with the first assembling part 21;

step five: and pouring concrete, and pouring the pier 1 and the foundation 2 into a whole, thereby completing the prefabrication and assembly.

The above embodiments are only used for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement of the present invention is made; all such modifications and variations are intended to be included herein within the scope of this disclosure and the appended claims.

Claims

1. The utility model provides a construction method of embedded connection structure of pier and basis, its characterized in that, an embedded connection structure of pier and basis include bracket (3) and enlarged head (4) that are equipped with in the bottom of pier (1), be equipped with in basis (2) with the rim of a cup (25) of enlarged head (4) looks adaptation, enlarged head (4) insert in rim of a cup (25), just bracket (3) with the top surface of basis (2) contacts, be filled with the concrete between enlarged head (4) and rim of a cup (25), its construction method includes following step:

the method comprises the following steps: respectively prefabricating a first assembly part (21) and a second assembly part (22) of the foundation (2);

step two: lofting the first assembled portion (21) at a design position;

step three: hoisting the pier (1), and pushing the expansion head (4) of the pier (1) into the cup mouth (25) of the foundation (2) from the side surface;

step four: aligning a limiting tenon (24) of the second assembling part (22) to a limiting hole (23) of the first assembling part (21) so that the second assembling part (22) is connected and fixed with the first assembling part (21);

step five: and pouring concrete, and pouring the pier (1) and the foundation (2) into a whole, thereby completing the prefabrication and assembly.

2. The construction method of an embedded connection structure of a pier and a foundation according to claim 1, wherein the plane size of the corbel (3) is larger than the opening size of the cup opening (25).

3. The construction method of the embedded connection structure of pier and foundation according to claim 1, wherein the elevation profile of the enlarged head (4) is trapezoidal, and the length of the upper base is less than the length of the lower base.

4. The construction method of the embedded connection structure of the pier and the foundation according to claim 1, wherein the foundation (2) is formed by assembling a plurality of components.

5. The construction method of the embedded connection structure of the pier and the foundation according to claim 4, wherein the foundation (2) is formed by splicing a first splicing part (21) and a second splicing part (22).

6. The construction method of an embedded connection structure of a pier and a foundation according to claim 5, wherein the length of the second assembly part (22) is less than the length of the foundation (2), and the width of the second assembly part (22) is the distance from the cup opening (25) to the edge of the foundation (2).

7. The construction method of an embedded connection structure of a pier and a foundation according to claim 5, wherein the second segment (22) has a rectangular or trapezoidal plan profile.

8. The construction method of an embedded connection structure of a pier and a foundation according to any one of claims 6 to 7, wherein the first and second segments (21, 22) are joggled with each other.

9. The construction method of the embedded connection structure of the pier and the foundation according to claim 8, wherein the first assembling portion (21) is provided with a limiting hole (23), and the second assembling portion (22) is provided with a matched limiting tenon (24).