Combined cast-in-place box girder support foundation

What is AI technical title?
AI technical title is built by Patsnap AI team. It summarizes the technical point description of the patent document.
By adopting a combined cast-in-place box beam support foundation in highway construction, the foundation connection is strengthened by grooves and convex designs, and through the joints of the fine-rolled rebar and embedded steel plates and steel pipe piles, the large amount of concrete foundation is solved. The problem has achieved a reduction in stability and cost, meeting the needs of concrete foundations in highway construction.

CN222313774UActive Publication Date: 2025-01-07CCCC SHEC FIRST HIGHWAY ENG

View PDF 0 Cites 0 Cited by

Patent Information

Application Number: CN202421093245.9
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-20
Publication Date: 2025-01-07
Estimated Expiration: 2034-05-20

AI Technical Summary

Technical Problem

In highway construction, when designing the concrete foundation of cast-in-place box beam bracket, in order to reduce the concrete usage, a smaller load-bearing size is often used, but this results in insufficient bearing capacity at the bottom of the steel pipe pile, which is difficult to meet the total load-bearing requirements. It is difficult to effectively utilize the upper concrete for recycling with technology, which increases construction costs.

Method used

The foundation of the composite cast-in-place box beam bracket is adopted, including the lower foundation and the upper foundation. The design of the design of a groove on the top surface of the lower foundation and a matching convex corrugated on the bottom surface of the upper foundation is increased, and the connection stability is increased, and the threaded steel is finely rolled. and the joints of embedded steel plates and steel pipe piles to realize the fixing and recycling of the upper and lower foundations.

Benefits of technology

It effectively reduces the concrete usage of concrete foundations, enhances the stability of the foundation, prevents slippage, and reduces construction costs through recycling, and improves the flexibility and efficiency of on-site construction.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN222313774U_ABST

Patent Text Reader

Abstract

The utility model relates to a combined cast-in-place box girder support foundation which comprises a lower-layer foundation and a plurality of upper-layer foundations, at least two grooves are formed in the top face of the lower-layer foundation, protruding edges matched with the grooves in a one-to-one correspondence mode are arranged on the bottom faces of the upper-layer foundations, the upper-layer foundations are placed on the lower-layer foundation, and the protruding edges are clamped into the grooves in a one-to-one correspondence mode. The area of the bottom face of each upper-layer foundation is smaller than that of the top face of the lower-layer foundation, the bottom faces of the upper-layer foundations are all pressed on the top faces of the lower-layer foundations, and embedded steel plates are arranged on the top faces of the upper-layer foundations. The combined cast-in-place box girder support foundation has the advantages that the upper-lower double-layer concrete combined foundation is adopted, and the upper-layer foundation can be recycled; the grooves and the convex edges are arranged on the contact surfaces of the two layers of foundations, so that the connection between the foundations is increased, and the foundations are prevented from sliding under pressure; steel plates are embedded in the top face of the upper-layer foundation, steel pipe pile connectors can be welded, and on-site welding construction with steel pipe piles is facilitated.

Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model belongs to the field of cast-in-situ box girder construction of expressways, and in particular relates to a combined cast-in-situ box girder support foundation. Background Art

[0002] During highway construction, sometimes a large number of cast-in-place box girders are needed for the bridge superstructure. The cast-in-place box girder supports are constructed using the less-support method. For sections with shallower covering layers, strip foundations are used at the bottom of the steel pipe piles, and the concrete foundation form is calculated based on the total bearing weight of the superstructure.

[0003] The concrete foundation is generally designed with a bearing surface size according to the magnitude of the force. If a 2*1m (width*height) concrete foundation is required according to the plan, then according to the principle that the concentrated force diffuses at a 45° angle in the concrete, the top of the strip foundation is far away from the steel pipe pile and has a smaller bearing capacity. Therefore, during the design, the upper part can be designed as a smaller foundation according to the principle of bearing capacity diffusion, thereby achieving the purpose of reducing the amount of concrete used in the concrete foundation. Based on the above concept, the utility model provides a combined cast-in-place box beam support foundation. Utility Model Content

[0004] The utility model provides a combined cast-in-place box beam support foundation, which aims to reduce the amount of concrete used in the concrete foundation and circulate and reuse the upper square concrete in the combined support foundation on the basis of meeting the requirements of the concrete foundation for the total load-bearing capacity of the box beam support, thereby reducing costs.

[0005] The utility model solves the above-mentioned technical problems through the following technical solutions: a combined cast-in-place box girder support foundation, comprising a lower foundation and a plurality of upper foundations, the top surface of the lower foundation being provided with at least two grooves, the bottom surface of the upper foundation being provided with convex ridges corresponding one to one with the grooves, the upper foundation being placed on the lower foundation and the convex ridges being inserted into the grooves one by one, the bottom surface area of each upper foundation being smaller than the top surface area of the lower foundation and the bottom surfaces of the upper foundations being all pressed onto the top surfaces of the lower foundations, and the top surfaces of the upper foundations being provided with embedded steel plates.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the lower foundation is a long strip foundation, and the upper foundation is a square foundation, a truncated cone foundation or a terraced foundation.

[0008] Furthermore, the thickness of the upper foundation and the lower foundation are both 0.5m, the lower foundation is in the shape of a rectangular parallelepiped, the width of the lower foundation is 2m, and the length is 0.5-1m extended outward from the edges of the upper foundation that are relatively adjacent at both ends.

[0009] Furthermore, the upper foundation is a rectangular foundation with a length and width of 1.5m and 1.3m respectively. The upper foundation is placed on the lower foundation and the latter two are aligned up and down on the center line of the long side direction. A plurality of upper foundations are evenly spaced on the lower foundation, and the distance between adjacent edges of two adjacent upper foundations is 2.7m.

[0010] Furthermore, the upper foundation is a terraced foundation and the bottom surface is a larger end surface. The bottom surface length of the terraced foundation is 2.3m and the width is 2m. The top surface length and width of the terraced foundation are both 1.3m. A plurality of upper foundations are evenly spaced on the lower foundation, and the distance between the adjacent edges of two adjacent upper foundations is 1.7m.

[0011] Furthermore, the grooves and convex ridges are arranged along the width direction of the upper foundation, the cross section of the grooves is trapezoidal, and the depth of the grooves is 12-20 cm.

[0012] Furthermore, a steel pipe pile joint is welded on the embedded steel plate.

[0013] Furthermore, it also includes a plurality of fine-rolled threaded steel bars, which are vertically arranged and have their lower ends buried in the lower foundation and connected to a pad and a nut. The upper foundation is provided with a positioning hole for the upper end of the fine-rolled threaded steel bar to pass upward, and the upper foundation and the lower foundation are fixed by pulling together through the fine-rolled threaded steel bars.

[0014] Furthermore, the upper foundation and the lower foundation are both provided with horizontally arranged steel meshes. The steel mesh of the upper foundation is arranged in the middle area, and the steel mesh of the lower foundation has two layers, one layer is close to the top surface of the lower foundation, and the other layer is close to the bottom surface of the lower foundation.

[0015] Furthermore, the steel mesh is made of HRB400 steel bars with a diameter of 12 mm in a crisscross pattern.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The combined cast-in-place box girder support foundation adopts an upper and lower double-layer concrete combined foundation, and the upper foundation can be used in rotation; grooves and convex ridges are set on the contact surfaces of the two foundations to increase the connection between the foundations and prevent slippage under pressure; the two foundations can be connected into one with fine-tied threaded steel anchors for better stability; the top surface of the upper foundation is pre-embedded with steel plates and steel pipe pile joints can be welded to facilitate on-site welding construction with steel pipe piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A front view of a combined cast-in-place box beam support foundation provided by the utility model (the upper foundation is a rectangular parallelepiped foundation, and the upper foundation at the leftmost end has not yet been placed);

[0019] Figure 2 for Figure 1 A top view of the composite cast-in-situ box girder support foundation is shown;

[0020] Figure 3 for Figure 1 Left view of the composite cast-in-situ box girder support foundation shown, highlighting the finished rolled rebar and embedded steel plates;

[0021] Figure 4 This is a front view of a combined cast-in-place box beam support foundation provided by the utility model, wherein the upper foundation is a terrace-shaped foundation;

[0022] Figure 5 for Figure 4 A top view of the composite cast-in-situ box girder support foundation is shown;

[0023] Figure 6 for Figure 4 Left side view of the composite cast-in-situ box girder support foundation, highlighting the embedded steel plate and its bottom anchorage);

[0024] Figure 7 for Figure 4 The diagram shows the layout of the steel mesh in the foundation of the composite cast-in-place box girder support.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 1. Lower foundation; 2. Upper foundation; 3. Grooves; 4. Convex ridges; 5. Embedded steel plates; 6. Steel pipe pile joints; 7. High-quality rolled threaded steel bars; 8. Steel mesh. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] In the description of the present invention, if terms indicating orientation such as "up", "down", "left", "right", "top", "bottom", "inside" and "outside" are used, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] like Figures 1 to 7As shown, the utility model provides a combined cast-in-place box girder support foundation, which includes a lower foundation 1 and several upper foundations 2, the top surface of the lower foundation 1 is provided with at least two grooves 3, the bottom surface of the upper foundation 2 is provided with convex ridges 4 corresponding to the grooves 3 one by one, the upper foundation 2 is placed on the lower foundation 1 and the convex ridges 4 are inserted into the grooves 3 one by one, the bottom surface area of each upper foundation 2 is smaller than the top surface area of the lower foundation 1 and the bottom surfaces of the upper foundations 2 are all pressed onto the top surface of the lower foundation 1, and the top surface of the upper foundation 2 is provided with an embedded steel plate 5.

[0030] It should be noted that the top surface of the embedded steel plate is used to be welded and fixed with the steel pipe piles, thereby forming a cast-in-place box beam support to provide support; it is understandable that in order for each upper foundation to be restricted in horizontal movement by the corresponding grooves and convex ridges, the bottom surface of each upper foundation is preferably divided into two convex ridges. When there is only one upper foundation on the lower foundation, the upper surface of the lower foundation has at least two grooves to match and engage with the two convex ridges. The two convex ridges on the bottom surface of the same upper foundation do not have to be arranged in parallel. In order to provide better positioning in the horizontal direction to prevent slippage, the two convex ridges can be arranged crosswise (for example, vertically intersecting).

[0031] In one embodiment of the present invention, Figure 2 and 5 As shown, the lower foundation 1 is a long strip foundation, and the upper foundation 2 is a square foundation, a truncated cone foundation or a terraced foundation.

[0032] In one embodiment of the present invention, Figures 1 to 3 As shown, the thickness of the upper foundation 2 and the lower foundation 1 are both 0.5m, the lower foundation 1 is in the shape of a rectangular parallelepiped, the width of the lower foundation 1 is 2m, and the length is 0.5-1m extended outward from the edges of the upper foundation 2 relatively adjacent at both ends. When the upper foundation is in the shape of a rectangular parallelepiped, the length of the lower foundation extending outward at both ends is preferably 0.5m.

[0033] It should be noted that the lower foundation is in the shape of a long strip, which can also be called a strip foundation, which provides support for the upper foundations, steel pipe piles, etc. placed above.

[0034] In one embodiment of the present invention, Figures 4 to 6 As shown, the upper foundation 2 is a rectangular foundation with a length and width of 1.5m and 1.3m respectively. The upper foundation 2 is placed on the lower foundation 1 and the two are aligned up and down on the center line of the long side direction. A plurality of upper foundations 2 are evenly spaced on the lower foundation 1, and the distance between the adjacent edges of two adjacent upper foundations 2 is 2.7m.

[0035] In one embodiment of the utility model, the upper foundation 2 is a stepped foundation and the bottom surface is a larger end surface. The bottom surface length of the stepped foundation is 2.3m and the width is 2m. The top surface length and width of the stepped foundation are both 1.3m. A plurality of upper foundations 2 are evenly spaced on the lower foundation 1, and the distance between adjacent edges of two adjacent upper foundations 2 is 1.7m.

[0036] In one embodiment of the utility model, the groove 3 and the ridge 4 are both arranged along the width direction of the upper foundation 2, and the lengths of the groove and the ridge are preferably smaller than the width of the lower foundation. The cross-section of the groove 3 is trapezoidal, the depth of the groove 3 is 12-20 cm, and the width of the notch at the top of the groove is 20-40 cm.

[0037] In one embodiment of the present invention, Figure 4 As shown, a steel pipe pile joint 6 is welded to the embedded steel plate 5 .

[0038] It should be noted that the steel pipe pile joint is a shorter round steel pipe with a diameter equivalent to that of the steel pipe pile. It is welded and fixed to the top surface of the embedded steel plate to play a positioning and connection role, making it convenient for the welding and fixation of the steel pipe pile on site.

[0039] In one embodiment of the present invention, Figures 1 to 3 As shown, it also includes a plurality of fine-rolled threaded steel bars 7, which are vertically arranged and have their lower ends buried in the lower foundation 1 and connected to a pad and a nut. The upper foundation 2 is provided with a positioning hole for the upper end of the fine-rolled threaded steel bars 7 to pass upward, and the upper foundation 2 and the lower foundation 1 are fixed by tensioning through the fine-rolled threaded steel bars 7.

[0040] It can be understood that after being fixed by the fine-rolled threaded steel bars, the upper and lower layers of the foundation are better relatively fixed, and the ability to prevent smooth movement and tipping is stronger.

[0041] In one embodiment of the present invention, Figure 7 As shown, the upper foundation 2 and the lower foundation 1 are both provided with horizontally arranged steel meshes 8. The steel mesh 8 of the upper foundation 2 is arranged in the middle area, and the steel mesh 8 of the lower foundation 1 has two layers, one layer is close to the top surface of the lower foundation 1, and the other layer is close to the bottom surface of the lower foundation 1.

[0042] In one embodiment of the present invention, the steel mesh 8 is made of HRB400 steel bars with a diameter of 12 mm in a crisscross pattern.

[0043] The specific construction method of the combined cast-in-place box beam support foundation provided by the utility model is briefly described as follows:

[0044] 1. Treat the roadbed, lay out, install formwork, tie steel bars, install embedded anchor bars (finely rolled threaded steel bars), and pour the lower strip foundation; 2. Lay oil felt on the top surface, install formwork, and pour the upper foundation; 3. Install and anchor the finely rolled threaded steel bars, and weld the steel pipe pile joints; 4. After the bracket is removed, release the anchor and remove the good foundation; 5. Move to the top surface of the strip foundation of the lower box girder bracket, align the anchor bars, install and anchor them, and realize recycling.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined cast-in-place box beam support foundation, characterized in that: The invention comprises a lower foundation (1) and a plurality of upper foundations (2), wherein the top surface of the lower foundation (1) is provided with at least two grooves (3), and the bottom surface of the upper foundation (2) is provided with convex ridges (4) which correspond one-to-one with the grooves (3); the upper foundation (2) is placed on the lower foundation (1) and the convex ridges (4) are inserted one-to-one into the grooves (3); the bottom surface area of each upper foundation (2) is smaller than the top surface area of the lower foundation (1) and the bottom surfaces of the upper foundations (2) are all pressed onto the top surfaces of the lower foundations (1); and the top surfaces of the upper foundations (2) are provided with embedded steel plates (5).

2. The combined cast-in-place box beam support foundation according to claim 1, characterized in that: The lower foundation (1) is a long strip foundation, and the upper foundation (2) is a square foundation, a truncated cone foundation or a terraced cone foundation.

3. The combined cast-in-place box beam support foundation according to claim 2, characterized in that: The thickness of the upper foundation (2) and the lower foundation (1) are both 0.5 m. The lower foundation (1) is in the shape of a rectangular parallelepiped. The width of the lower foundation (1) is 2 m, and the length is 0.5-1 m extending outward from the edges of the upper foundation (2) that are relatively adjacent at both ends.

4. The combined cast-in-place box beam support foundation according to claim 3, characterized in that: The upper foundation (2) is a rectangular foundation with a length and a width of 1.5 m and 1.3 m respectively. The upper foundation (2) is placed on the lower foundation (1) and the two are aligned up and down on the center line of the long side direction. A plurality of upper foundations (2) are evenly spaced on the lower foundation (1), and the distance between adjacent edges of two adjacent upper foundations (2) is 2.7 m.

5. The combined cast-in-place box beam support foundation according to claim 3, characterized in that: The upper foundation (2) is a terrace-shaped foundation and the bottom surface is a larger end surface. The bottom surface length of the terrace-shaped foundation is 2.3 m and the width is 2 m. The top surface length and width of the terrace-shaped foundation are both 1.3 m. A plurality of upper foundations (2) are evenly spaced on the lower foundation (1), and the distance between adjacent edges of two adjacent upper foundations (2) is 1.7 m.

6. The combined cast-in-place box beam support foundation according to claim 2, characterized in that: The groove (3) and the convex ridges (4) are both arranged along the width direction of the upper foundation (2); the cross section of the groove (3) is trapezoidal; and the depth of the groove (3) is 12-20 cm.

7. The combined cast-in-place box beam support foundation according to claim 1, characterized in that: A steel pipe pile joint (6) is welded to the embedded steel plate (5).

8. The combined cast-in-place box beam support foundation according to claim 1, characterized in that: It also includes a plurality of finely rolled threaded steel bars (7), the finely rolled threaded steel bars (7) being arranged vertically and having their lower ends embedded in the lower foundation (1) and connected to a pad and a nut, the upper foundation (2) being provided with a positioning hole for the upper ends of the finely rolled threaded steel bars (7) to pass upward, and the upper foundation (2) and the lower foundation (1) being fixed by tensioning through the finely rolled threaded steel bars (7).

9. A combined cast-in-place box beam support foundation according to any one of claims 1 to 8, characterized in that: The upper foundation (2) and the lower foundation (1) are both provided with horizontally arranged steel meshes (8); the steel mesh (8) of the upper foundation (2) is arranged in the middle area, and the steel mesh (8) of the lower foundation (1) has two layers, one layer is close to the top surface of the lower foundation (1), and the other layer is close to the bottom surface of the lower foundation (1).

10. The combined cast-in-place box beam support foundation according to claim 9, characterized in that: The steel mesh (8) is made of HRB400 steel bars with a diameter of 12 mm, which are crisscrossed.