Ground beam and pile foundation connecting structure

Abstract

The utility model discloses a connecting structure of a ground beam and pile foundations, which belongs to the field of bridge building structures, the ground beam is erected on a plurality of pile foundations, the connecting structure comprises a vertical main reinforcement net, a plurality of vertical main reinforcements are circumferentially distributed by taking the center line of the pile foundations as the axis to form the vertical main reinforcement net, the vertical main reinforcement net comprises a main body section, a necking section and an extending section, the main body section and the necking section are located in the pile foundation, and the extending section is inserted into the ground beam; the stirrup net is composed of a plurality of stirrups, and the stirrups are wound and fixed on the main body sections and the necking sections of the vertical main reinforcements; and the concrete layer is filled in the ground beam and wraps the extending section. According to the connecting structure for the ground beam and the pile foundation, the top of the vertical main reinforcement net is necked inwards to form the necking section, the necking section is connected with the extending section, the extending length of the vertical main reinforcement is reduced, the contact range of the extending section and the ground beam is reduced, the pile foundation and the ground beam can slightly rotate, and the ground beam can be prevented from being damaged. And the connection strength and durability of the ground beam and the pile foundation are ensured.

Description

Technical Field

[0001] The utility model relates to the field of bridge building structures, in particular to a ground beam and pile foundation connection structure. Background Art

[0002] The existing connection method between the bridge ground beam and the pile foundation mainly adopts the consolidation method, which has the following disadvantages: when the bridge crosses a large obstacle, such as a subway shield machine, an oil and gas pipeline, etc., the pedestal will be designed as a ground beam. When transferring loads at the upper part, not only will the ground beam generate a large bending moment, but a large bending moment will also be formed on the top of the pile foundation, causing the concrete strength and steel bar strength at the top of the pile foundation to exceed the allowable values ​​specified in the specifications, and at the same time, the cracks are large and the durability requirements of the engineering structure are not met. If the reinforcement is increased and the structural size is increased to meet the requirements of the specifications, materials will be wasted, resulting in high construction costs. Utility Model Content

[0003] The utility model provides a ground beam and pile foundation connection structure, aiming to solve the problem mentioned in the background technology that the bending moment generated between the ground beam and the pile foundation causes the structural strength of the connection to be reduced.

[0004] In order to achieve the above purpose, the utility model adopts the following scheme:

[0005] The utility model provides a ground beam and pile foundation connection structure, wherein the ground beam is erected on a plurality of pile foundations, and the connection structure comprises: a vertical main reinforcement network, which is formed by a plurality of vertical main reinforcements distributed circumferentially with the center line of the pile foundation as the axis; the vertical main reinforcement network comprises a main body section, a necking section and an extension section, the necking section is necked inwardly along the end of the main body section and connected to the extension section, and the outer diameter of the circle formed by the extension section is smaller than the outer diameter of the circle formed by the main body section; the main body section and the necking section are located inside the pile foundation, and the extension section is inserted into the ground beam; a stirrup network, which is composed of a plurality of stirrups, and the stirrups are wound and fixed on the main body section and the necking section of the vertical main reinforcement; a concrete layer, which is filled in the ground beam and covered on the periphery of the extension section.

[0006] Optionally, the length of the extending section is L, the diameter of the vertical main reinforcement is d, and L is 15d-20d.

[0007] Optionally, the inwardly contracting inclination angle r of the contracted section is 10°-20°.

[0008] Furthermore, the surface of the vertical main reinforcement and / or the surface of the stirrup is coated with a sliding layer.

[0009] Optionally, the surface of the vertical main reinforcement located in the extension section is coated with a sliding layer.

[0010] Optionally, the sliding layer is an asphalt material layer.

[0011] Furthermore, a plurality of circles of anti-cracking steel bars are arranged in the pile foundation, and the anti-cracking steel bars are located outside the shrinkage section.

[0012] Compared with the existing technology, the utility model has the following advantages:

[0013] The top of the vertical main reinforcement mesh is contracted inward to form a contracted section, which is connected to the extension section, reducing the extension length of the vertical main reinforcement and the contact range between the extension section and the ground beam, so that the pile foundation and the ground beam can produce a slight rotation, reducing the bending moment between the ground beam and the pile foundation, and only transmitting concentrated force to the pile foundation, thereby increasing the life of the node between the ground beam and the pile foundation, ensuring the safety of the structure, and reducing the reinforcement ratio of the pile foundation, thereby saving engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0015] Figure 1 It is a schematic diagram of the installation of bridge piers, ground beams and pile foundations provided by an embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of the internal structure of the ground beam and pile foundation.

[0017] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0018] Figure 4 It is a cross-sectional view of the main reinforcement in the fixing frame.

[0019] Figure 5 It is the first step in the ground beam pouring process.

[0020] Figure 6 It is the second step in the ground beam pouring process

[0021] Figure 7 It is the third step in the ground beam casting process.

[0022] Figure 8 yes Figure 7 Enlarged view of part B in the middle.

[0023] Main component symbols:

[0024] 1. Pier column; 2. Ground beam; 21. Ground beam formwork; 3. Pile foundation; 4. Stirrup mesh; 5. Main section; 51. Vertical main reinforcement; 52. Sliding layer; 6. Recessed section; 7. Extension section; 8. Anti-cracking reinforcement; 9. Concrete layer. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Example

[0027] Refer to the attached drawings of the specification, such as Figure 1-Figure 8 As shown, a ground beam and pile foundation connection structure is shown, wherein the ground beam 2 is arranged on multiple pile foundations 3, and the pier 1 supporting the bridge is arranged on the ground beam 2; based on this, the connection structure includes: a stirrup mesh 4, a main section 5, a necking section 6, an extension section 7, anti-cracking steel bars 8 and a concrete layer 9.

[0028] Specifically, Figure 2 , Figure 3 As shown, multiple vertical main bars are circumferentially distributed with the center line of the pile foundation 3 as the axis to form a vertical main bar network. The vertical main bar network is divided into a main section 5, a constricted section 6 and an extended section 7, wherein the constricted section 6 is formed by the top of the main section 5 being constricted inwardly, and the top of the constricted section 6 is connected to the extended section 7, so that the outer diameter D1 of the circle formed by the extended section 7 is smaller than the outer diameter D2 of the circle formed by the main section, so that the steel bar distribution range of the extended section 7 is smaller than the steel bar distribution range of the main section 5. The main section 5 and the constricted section are located inside the pile foundation 3, and the extended section 7 is inserted into the ground beam 2.

[0029] Optional, such as Figure 3 As shown, the length of the extension section is L, the diameter of the vertical main reinforcement is d, and L is 15d-20d.

[0030] Optional, such as Figure 3 As shown, the inwardly contracting inclination angle r of the contracted section 6 is 10°-20°, and can be specifically 15°.

[0031] The outer side of the vertical main reinforcement mesh is connected by a stirrup mesh 4, which is spiral-shaped and the top of which shrinks inwards along with the vertical main reinforcement mesh.

[0032] A concrete layer 9 is filled in the ground beam 2 , and the concrete layer 9 covers the extending section 7 .

[0033] In order to facilitate the rotation of the vertical main reinforcement network, Figure 4 As shown, a sliding layer 52 is coated on the surface of the vertical main reinforcement 51 and / or the stirrups; optionally, the sliding layer 52 may be coated only on the surface of the vertical main reinforcement 51 located in the extension section 7. Specifically, the sliding layer 52 may be made of asphalt material.

[0034] In addition, if Figure 2 , Figure 3 As shown, a plurality of circles of anti-cracking steel bars 8 are arranged on the outer side of the top of the contraction section 6 to prevent the concrete at the connection between the ground beam 2 and the pile foundation 3 from cracking and causing a large gap.

[0035] Based on this, Figure 5-Figure 8 As shown, the installation process of the ground beam is as follows:

[0036] like Figure 5 As shown, the pile foundation 3 is first constructed, and a vertical main reinforcement mesh is reserved in the pile foundation 3. At this time, the vertical main reinforcement mesh is divided into a main body section 5 and a shrinking section 6 in the pile foundation 3, and the extending section 7 is located outside the pile foundation 3;

[0037] like Figure 6 As shown, a ground beam formwork 21 is then built on the pile foundation 3 and concrete is poured into it.

[0038] like Figure 7 , Figure 8 As shown, after the concrete pouring is completed, the connection between the ground beam 2 and the pile foundation 3 is completed.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A ground beam and pile foundation connection structure, wherein the ground beam is erected on a plurality of pile foundations, characterized in that: include: A vertical main reinforcement network is formed by a plurality of vertical main reinforcements distributed circumferentially with the center line of the pile foundation as the axis; the vertical main reinforcement network includes a main body section, a constricted section and an extended section, the constricted section is constricted inwardly along the end of the main body section and connected to the extended section, so that the outer diameter of the circle formed by the extended section is smaller than the outer diameter of the circle formed by the main body section; the main body section and the constricted section are located inside the pile foundation, and the extended section is inserted into the inside of the ground beam; A stirrup mesh, consisting of a plurality of stirrups, the stirrups being wound and fixed on the main body section and the necking section of the vertical main reinforcement; A concrete layer is filled in the ground beam and covers the extending section.

2. A ground beam and pile foundation connection structure according to claim 1, characterized in that: The length of the extending section is L, the diameter of the vertical main reinforcement is d, and L is 15d-20d.

3. A ground beam and pile foundation connection structure according to claim 1, characterized in that: The inwardly contracting inclination angle r of the contraction section is 10°-20°.

4. The ground beam and pile foundation connection structure according to claim 1, characterized in that: The surface of the vertical main reinforcement and / or the surface of the stirrup are coated with a sliding layer.

5. The ground beam and pile foundation connection structure according to claim 1, characterized in that: The surface of the vertical main reinforcement located in the extending section is coated with a sliding layer.

6. A ground beam and pile foundation connection structure according to claim 4 or 5, characterized in that: The sliding layer is an asphalt material layer.

7. The ground beam and pile foundation connection structure according to claim 2, characterized in that: A plurality of circles of anti-cracking steel bars are also arranged in the pile foundation, and the anti-cracking steel bars are located outside the shrinking section.

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