A connecting structure of a bridge precast cap beam and a precast column

Abstract

The utility model belongs to bridge construction field, concretely relates to a kind of connecting structure of bridge precast bent cap and precast column. Including: grouting bellows embedded in bent cap, the grouting bellows is penetrated through bent cap;Grouting sleeve embedded in column, the grouting sleeve upper end is flush with column top, lower end is connected column main reinforcement;Steel bar inserted into the grouting bellows and grouting sleeve, the steel bar diameter is same with column main reinforcement;Grouting material filled in the grouting bellows and grouting sleeve;Supporting plate is arranged in column top, the supporting plate has vertical intensity of bearing bridge load, and with bent cap contact surface friction coefficient is low;Grouting material fills the gap between bent cap and column.Compared with prior art, bent cap is in situ without needing to be vertically dropped above column, so that the segmentation and connecting joint of precast bent cap are more diversified, and the design freedom of bent cap is improved.

Description

Technical Field

[0001] This utility model belongs to the field of bridge construction, specifically relating to a connection structure between a precast bridge cap beam and a precast column. Background Technology

[0002] In the field of municipal and highway bridge construction, precast assembly technology is widely used due to its high efficiency and controllable quality. Currently, the connection between precast cap beams and precast columns mainly adopts the following technical solution: vertically extending reinforcing bars are pre-installed at the top of the precast column, and grouting corrugated pipes are pre-embedded in the precast cap beam. During construction, the cap beam must be vertically aligned with the column, ensuring the corrugated pipes in the cap beam are precisely inserted into the extending reinforcing bars of the column, followed by grouting for fixation.

[0003] However, the existing technologies described above have the following drawbacks: the cap beam must be lowered strictly vertically to ensure alignment between the corrugated pipe and the column reinforcement. This process demands extremely high construction precision, especially in complex terrain or space-constrained construction scenarios, where vertical hoisting is difficult and can easily lead to low installation efficiency or even failure. Due to the limitations of vertical installation, the segmented and block design of the cap beam must strictly match the position of the column reinforcement, making it difficult to achieve diverse joint forms and restricting the adaptability of the bridge structure. Therefore, there is an urgent need for a new connection structure that can overcome the limitations of vertical installation and improve the design freedom of the cap beam. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a connection structure for precast bridge cap beams and precast columns. With this structure, the precast cap beam does not need to be lowered vertically into place during installation, which makes the segmentation and connection joints of the precast cap beam more diverse and improves the design freedom of the cap beam.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A connection structure for a precast bridge cap beam and a precast column includes:

[0007] A grouting corrugated pipe is embedded in the cap beam, and the grouting corrugated pipe penetrates the cap beam;

[0008] A grouting sleeve is embedded in the column, with its upper end flush with the top of the column and its lower end connected to the main reinforcement of the column.

[0009] The reinforcing bars inserted into the grouting corrugated pipe and grouting sleeve have the same diameter as the main reinforcing bars of the column;

[0010] The first grouting material is filled into the grouting corrugated pipe and the grouting sleeve;

[0011] The support plate installed on the top of the column has vertical strength to withstand the bridge load and has a low coefficient of friction in contact with the cap beam.

[0012] The second grouting material used to fill the gap between the cap beam and the column.

[0013] Furthermore, the grouting sleeve and the grouting corrugated pipe correspond one-to-one vertically, and the reinforcing bar is inserted into the sleeve after passing through the corrugated pipe from the top of the cap beam.

[0014] Furthermore, the contact surface between the support plate and the cover beam is a flat surface or a low-friction material coating.

[0015] Furthermore, the cap beam is divided into two parts, namely the left cap beam and the right cap beam, and the two cap beams are connected by adhesive joints.

[0016] Correspondingly, in order to achieve the above structure, the construction method is as follows:

[0017] A. Install the uprights and the support plate on top of the uprights;

[0018] B. Place the cap beam on the support plate and align the grouting corrugated pipe and the grouting sleeve;

[0019] C. Insert the reinforcing bar from the top of the cap beam, allowing it to pass through the corrugated pipe and enter the sleeve;

[0020] D. Inject the first grout into the grouting sleeve;

[0021] E. Seal the gap between the cap beam and the column, and inject a second grout into the corrugated pipe and the gap;

[0022] F. Curing until the grout has hardened.

[0023] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0024] This invention utilizes a pre-embedded corrugated grouting pipe penetrating the cap beam and a grouting sleeve flush with the top of the column to form a transverse channel. Combined with the sliding guidance of a low-friction support plate, this allows the cap beam to be moved horizontally for position adjustment. After inserting reinforcing bars, high-strength grout is injected to solidify the connection. This transforms the rigid installation requiring vertical alignment in traditional processes into a flexible installation that can be adjusted laterally, thus enabling the cap beam to be precisely positioned without needing to be lowered vertically. It is particularly suitable for construction scenarios with confined spaces or complex terrain, significantly improving construction adaptability.

[0025] Since the installation method is no longer limited to the vertical direction, the cap beam can be designed in multiple segments and connected through lateral installation. This design makes the structural forms of the cap beam more diverse, adaptable to engineering needs of different spans, loads, and bridge shapes, and expands the application range of precast bridges. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the first stage of installation in a preferred embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the second stage of installation in a preferred embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the bridge construction stage of a preferred embodiment of the present invention.

[0029] In the diagram: 1. Grouting corrugated pipe; 2. Grouting sleeve; 3. Reinforcing bar; 4. First grouting material; 5. Support plate; 6. Second grouting material; 11. Adhesive joint; 12. Left cap beam; 13. Right cap beam; 14. Main reinforcement. Detailed Implementation

[0030] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. The descriptions of the embodiments are merely illustrative and not intended to limit the scope of this utility model. Those skilled in the art can make appropriate adjustments based on the concept of this utility model, but these adjustments should still be included within the protection scope of this utility model.

[0031] Please see Figure 1 First, the precast columns are vertically fixed to the pier foundation. The upper end of the grouting sleeve 2 is flush with the top of the column, and the lower end is welded or threaded to the main reinforcement 14 of the column. Then, a support plate 5 is installed on the top of the column. This support plate has sufficient vertical strength to support the weight of the cap beam, and its contact surface with the cap beam is flat or coated with polytetrafluoroethylene to ensure that the cap beam can be adjusted horizontally.

[0032] The right side portion 13 of the precast cap beam is moved laterally above the support plate 5. The position of the cap beam is adjusted by utilizing the low-friction characteristics of the support plate, so that the grouting corrugated pipe 1 embedded in the cap beam is initially aligned with the grouting sleeve 2 in the column. At this point, the cap beam can achieve horizontal positioning without needing to be lowered vertically.

[0033] Please see Figure 2 After the right side 13 of the cap beam is in place, the reinforcing bar 3 is vertically inserted from the top of the cap beam. The diameter of the reinforcing bar 3 is the same as that of the main reinforcing bar 14 of the column, and its lower end passes through the grouting corrugated pipe 1 embedded in the cap beam and the grouting sleeve 2 embedded in the column in sequence until it is inserted into the bottom of the sleeve. During this process, the transverse channel of the corrugated pipe 1 allows the reinforcing bar 3 to self-adjust within the horizontal deviation range to ensure smooth insertion.

[0034] High-strength first grout 4 is injected into the grouting port of grouting sleeve 2 until the grout fills the internal gaps of the sleeve. After the grout has solidified, the reinforcing bar 3 forms a rigid connection with sleeve 2 and main reinforcement 14, thus initially completing the vertical force transfer between the cap beam and the column.

[0035] Please see Figure 3The gap between the cap beam and the column is sealed using a template, and a second grout 6 is injected into the gap. Simultaneously, grout 4 is injected into the corrugated pipe 1 through the grouting hole at the top of the cap beam, ensuring that the gap between the corrugated pipe and the reinforcing steel 3 is completely filled. After the grout has cured, an integrated load-bearing structure is formed, consisting of the cap beam, reinforcing steel, sleeve, and column.

[0036] The left side (12) and right side (13) of the cap beam are bonded together with epoxy resin adhesive to complete the assembly of the entire cap beam. Finally, the grout is cured until it reaches the design strength.

[0037] In this embodiment, the cap beam is divided into two parts: a left side 12 and a right side 13, connected by an adhesive joint 11. The left side 12 can be installed vertically using a traditional method, while the right side 13 adopts the horizontal installation method of this invention. The combination of the two methods can adapt to complex construction conditions. The vertical bearing capacity and low friction characteristics of the support plate 5, combined with the final curing connection of the grout, ensure both temporary stability during the construction phase and permanent rigid connection during the service phase. The horizontal through-hole design of the grouting corrugated pipe 1 and the self-leveling characteristics of the grout allow for a certain horizontal deviation during construction. The error is compensated by grouting to ensure connection accuracy.

[0038] The above embodiments are merely examples. In actual construction, parameters can be adjusted according to the specific dimensions of the bridge, load requirements, and site conditions, but all should include the core structural features of this utility model.

Claims

1. A connection structure for a precast bridge cap beam and a precast column, characterized in that, include: A grouting corrugated pipe (1) is embedded in the cap beam, the grouting corrugated pipe (1) penetrates the cap beam; a grouting sleeve (2) is embedded in the column, the upper end of the grouting sleeve (2) is flush with the top of the column, and the lower end is connected to the main reinforcement (14) of the column; a steel bar (3) is inserted into the grouting corrugated pipe (1) and the grouting sleeve (2), the diameter of the steel bar (3) is the same as the main reinforcement of the column; a first grouting material (4) is filled in the grouting corrugated pipe (1) and the grouting sleeve (2); a support plate (5) is set on the top of the column, the support plate (5) has vertical strength to bear the bridge load, and the friction coefficient of the contact surface with the cap beam is low; a second grouting material (6) is filled in the gap between the cap beam and the column.

2. The connection structure between the precast bridge cap beam and the precast column according to claim 1, characterized in that, The grouting sleeve (2) corresponds to the grouting corrugated pipe (1) in the vertical direction. The reinforcing bar (3) is inserted into the grouting sleeve (2) after passing through the corrugated pipe (1) from the top of the cap beam.

3. The connection structure between the precast bridge cap beam and the precast column according to claim 1, characterized in that, The contact surface between the support plate (5) and the cap beam is a flat surface or a low-friction material coating.

4. The connection structure between the precast bridge cap beam and the precast column according to claim 1, characterized in that, The cap beam is divided into two parts, namely the left cap beam (12) and the right cap beam (13), and the two cap beams are connected by adhesive joint (11).

Images