Lower structure of pile plate type structure
By adopting a combined structure of prestressed concrete pipe piles and steel pipe concrete columns in pile plate structures, the crack problems during the construction and operation period of traditional pile plate structures are solved, the compression and bending bearing capacity are improved, the construction period is shortened and the construction period is reduced. Environmental pollution is suitable for various earthquake environments.
Patent Information
- Application Number
- CN202420993121.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-09
AI Technical Summary
Prestressed concrete pipe piles with traditional pile plate structures are prone to micro-cracks and stress concentration during the construction and operation period, resulting in pile body crack development and structural durability problems. The construction period is long, the land covers a large area and has a lot of environmental pollution.
The combined structure of prestressed concrete pipe piles and steel pipe concrete columns is adopted, and the connection members are fixedly connected to the cast-in-place concrete bearing table to enhance the compressive, bending and shear bearing capacity, and the steel pipe concrete columns and prestressed concrete pipe piles are used to strengthen the compressive, bending and shear bearing capacity. Combined type solves the problems of pile body cracks and pile head fractures.
Shorten the construction period, improve the mechanical properties and durability of the structure, reduce costs, and reduce environmental pollution. It is suitable for conventional and high-intensity seismic environments.
Smart Images
Figure CN222226954U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of highway construction, in particular to a lower structure of a pile-plate type structure. Background Art
[0002] With the advancement of urbanization in my country, many existing roads in the highway network can no longer meet the current traffic demand, and many roads are in urgent need of widening, reconstruction and expansion. In previous highway widening, the roadbed of the widened part was often constructed by filling the roadbed. However, the original roadbed has settled and stabilized, and the widening and filling roadbed cannot guarantee its stable settlement due to the limited filling construction time, so it is very easy to produce cracks and misalignment between the new and old roadbeds. On the other hand, for new highways in plain areas, the traditional roadbed filling scheme has serious problems such as difficulty in land acquisition, difficulty in soil acquisition, and long construction period.
[0003] The pile-slab structure is a new type of roadbed structure that can effectively solve the above two problems. It consists of an upper structure + a lower structure. Compared with soil roadbed, it has the advantages of reducing land occupation, no need to take soil, small post-construction settlement, large overall rigidity, less environmental pollution, and green environmental protection.
[0004] The lower structure of the pile-slab structure generally adopts prestressed high-strength concrete pipe piles (PHC pipe piles), mixed reinforced prestressed pipe piles (PRC pipe piles) or a combination of the two (i.e., PRC pipe piles are used for columns and PHC pipe piles are used for piles). PHC pipe piles are mainly composed of high-strength concrete and prestressed steel bars, with poor ductility, and are mainly used for pressure-bearing piles. The steel bars of PRC pipe piles are composed of prestressed steel bars and ordinary longitudinal steel bars, with good ductility and can withstand large bending moments. The main body of the pipe wall of PHC pipe piles and PRC pipe piles are both high-strength concrete layers. Affected by geometric uncertainty, material uncertainty, and uncertain factors in stacking and transportation, some pipe piles may have microcracks in their pile bodies when they enter the site. In addition, during the piling process at the construction site, new microcracks may appear in the pile body and stress concentration may occur due to unreasonable selection of pile hammer excitation force or construction errors such as hammer eccentricity. The stress state of "micro cracks + stress concentration" may cause the micro cracks in the pile body to develop into longer vertical cracks or even cause pile head breakage, which in turn affects the quality and progress of the project; on the other hand, the part of the pipe piles above the ground during the operation period is subject to large bending moments. This working state of "micro cracks + large bending moments" will promote the development of micro cracks, which in turn affects the durability of the structure. Summary of the invention
[0005] In order to solve the above problems, the utility model provides a new type of lower structure of the pile-plate structure, which can specifically adopt the following technical solutions:
[0006] The lower structure of the pile-slab structure described in the utility model comprises a prestressed concrete pipe pile arranged below the ground, the prestressed concrete pipe pile is connected to a coaxially arranged steel tube concrete column through a connecting member, the steel tube concrete column is located above the prestressed concrete pipe pile and is entirely or partially located above the ground, the steel tube concrete column comprises a concrete inner core and a cylindrical steel plate outer shell arranged outside the steel tube concrete column, and an end plate for connecting a precast concrete slab is arranged on the top of the cylindrical steel plate outer shell.
[0007] The concrete inner core is a cylindrical structure or annular cylindrical structure made of concrete with a grade of C30 or above.
[0008] The prestressed concrete pipe pile comprises an annular pipe wall made of high-strength concrete, and prestressed steel bars are arranged inside the annular pipe wall.
[0009] The cross-sectional dimension of the steel tube concrete column is smaller than or equal to the cross-sectional dimension of the prestressed concrete pipe pile, and the concrete inner core is arranged above the bottom surface of the cylindrical steel plate outer shell.
[0010] The connecting member includes a concrete partition arranged in the inner cavity of the prestressed concrete pipe pile, a core-filled concrete body is located above the concrete partition, and anchor steel bars extending upward are arranged in the core-filled concrete body. Shear nails are arranged on the inner wall of the cylindrical steel plate shell, and the prestressed concrete pipe pile and the steel pipe concrete column are fixedly connected by a cast-in-place concrete cap.
[0011] The size of the cast-in-place concrete cap is larger than that of the prestressed concrete pipe pile, and the top surface of the cast-in-place concrete cap is arranged above the bottom surface of the concrete core, and the bottom surface of the cast-in-place concrete cap is arranged below the top surface of the prestressed concrete pipe pile.
[0012] The connecting member includes a closing plate arranged on the top of the prestressed concrete pipe pile, and also includes a connecting steel sleeve arranged outside the steel tube concrete column and the prestressed concrete pipe pile, and a grouting concrete body for connecting the steel tube concrete column and the prestressed concrete pipe pile is arranged in the connecting steel sleeve.
[0013] The inner diameter of the connecting steel sleeve is larger than the outer diameter of the prestressed concrete pipe pile, and the top surface of the grouting concrete body is arranged above the bottom surface of the concrete inner core, and the bottom surface of the grouting concrete body is arranged below the closing plate.
[0014] The advantages of the utility model are short construction period, reasonable structure, good mechanical properties, low cost, the main components can be prefabricated in advance, assembled on site, and the on-site construction speed is fast; the combined structure of steel pipes and concrete is adopted, and compared with the traditional prestressed concrete pipe pile pier structure, it not only enhances the compression, bending and shear bearing capacity of the lower structure, but also solves the problems of pile body cracks and pile head crushing; it is not only suitable for conventional earthquake environments, but also has more outstanding effects when used in areas with high earthquake intensity. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model.
[0016] Figure 2 yes Figure 1 Schematic diagram of the connection structure between steel tube concrete column and prestressed concrete pipe pile Figure 1 .
[0017] Figure 3 yes Figure 1 Schematic diagram of the connection structure between steel tube concrete column and prestressed concrete pipe pile Figure 2 .
[0018] Figure 4 yes Figure 1 , 2 and 3 are cross-sectional views of the prestressed concrete pipe piles.
[0019] Figure 5 It is a shear force-displacement comparison diagram of the substructure of the utility model and the existing pile-plate structure. DETAILED DESCRIPTION
[0020] The following is a detailed description of an embodiment of the utility model in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific construction process are given, but the protection scope of the utility model is not limited to the following embodiment.
[0021] like Figure 1 As shown, the lower structure of the pile-slab structure described in the utility model includes a prestressed concrete pipe pile 1 arranged below the ground, and the prestressed concrete pipe pile 1 is connected to a coaxially arranged steel tube concrete column 2 through a connecting member, and the steel tube concrete column 2 is located above the prestressed concrete pipe pile 1 and is completely or partially located above the ground, and the steel tube concrete column 2 is used to connect a precast concrete slab 3.
[0022] like Figure 2-4As shown, the cross-sectional dimension of the prestressed concrete pile 1 is greater than or equal to the cross-sectional dimension of the steel tube concrete column 2. It is an annular structure, including an annular tube wall 11 made of high-strength concrete, and a plurality of prestressed steel bars 12 are evenly spaced in the annular tube wall 11. The steel tube concrete column 2 includes a concrete inner core 21 and a cylindrical steel plate outer shell 22 arranged outside the concrete inner core 21, and an end plate 23 for connecting the precast concrete slab 3 is arranged on the top of the cylindrical steel plate outer shell 22. The above-mentioned concrete inner core 21 is a cylindrical structure made of C30 or above grade concrete (see Figure 2 , 3 ) or an annular cylindrical structure, and it is usually arranged above the bottom surface of the cylindrical steel plate shell 22.
[0023] The prestressed concrete pipe pile 1 and the steel tube concrete column 2 can be connected by a cast-in-place cap or a steel sleeve.
[0024] When the connection is made by using a cast-in-place cap, the connection member includes a concrete partition 41 arranged in the inner cavity of the prestressed concrete pipe pile 1, a core-filled concrete body 42 is arranged above the concrete partition 41, a plurality of anchoring steel bars 43 extending upward are arranged in the core-filled concrete body 42, a shear nail 44 is arranged at the bottom of the inner wall of the cylindrical steel plate shell 22, and the anchoring steel bars 43 and the cylindrical steel plate shell 22 are fixedly connected by a cylindrical cast-in-place concrete cap 45. Usually, the size of the cast-in-place concrete cap 45 is larger than the size of the prestressed concrete pipe pile 1, the top surface of the cast-in-place concrete cap 45 is arranged above the bottom surface of the concrete core 21 in the steel tube concrete column 2, and the bottom surface of the cast-in-place concrete cap 45 is arranged below the top surface of the prestressed concrete pipe pile 1.
[0025] When the connection is made by the steel sleeve method, the connection member includes a closing plate 51 arranged on the top of the prestressed concrete pipe pile 1, and also includes a connecting steel sleeve 52 arranged on the outside of the steel tube concrete column 2 and the prestressed concrete pipe pile 1, and a grouting concrete body 53 for connecting the steel tube concrete column 2 and the prestressed concrete pipe pile 1 is arranged in the connecting steel sleeve 52. The inner diameter of the connecting steel sleeve 52 is larger than the outer diameter of the prestressed concrete pipe pile 1, and the top surface of the grouting concrete body 53 is higher than the bottom surface of the concrete core 21, and the bottom surface of the grouting concrete body 53 is arranged below the closing plate 51.
[0026] Compared with the prior art, the utility model has the following advantages:
[0027] 1) It is prefabricated in the factory and assembled on site, without the need to tie steel bars and tension prestressing. It is easy to make and has a low defect rate, which can shorten the production period;
[0028] 2) The steel-concrete composite structure effectively solves the problems of pile body cracks and pile head crushing, which can shorten the construction period;
[0029] 3) Good mechanical properties. The steel-concrete structure can fully utilize the advantages of high strength of steel. The restraining force of the steel pipe improves the strength of the concrete, enhances the compressive and bending bearing capacity of the lower structure, and can also avoid the adverse effects of prestressed concrete piles being sheared under strong earthquakes. Compared with PRC pile columns with the same bending bearing capacity, the compressive bearing capacity of steel tube concrete columns is increased by about 114%, and the cracking bending moment is increased by about 14%;
[0030] 4) Save construction costs. Compared with PRC pile columns with the same bending bearing capacity, steel tube concrete columns can reduce the cost by about 28%;
[0031] 5) Low carbon and environmental protection, energy saving and emission reduction, less environmental pollution, and good social benefits. Compared with PRC pipe pile columns with the same bending bearing capacity, the amount of concrete used in steel tube concrete columns is reduced by about 45%. Considering the recycling of steel materials, the steel tube concrete columns described in the utility model can reduce carbon emissions by about 10% compared with PRC pipe pile columns.
[0032] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships, such as "front", "rear", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do 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.
Claims
1. A substructure of a pile-plate structure, characterized in that: The invention comprises a prestressed concrete pipe pile arranged below the ground, wherein the prestressed concrete pipe pile is connected to a coaxially arranged steel tube concrete column through a connecting member, wherein the steel tube concrete column is located above the prestressed concrete pipe pile and is entirely or partially located above the ground, and the steel tube concrete column comprises a concrete inner core and a cylindrical steel plate outer shell arranged outside the steel tube concrete column, and an end plate for connecting a precast concrete panel is arranged on the top of the cylindrical steel plate outer shell.
2. The lower structure of the pile-plate structure according to claim 1, characterized in that: The concrete inner core is a cylindrical structure or annular cylindrical structure made of concrete with a grade of C30 or above.
3. The lower structure of the pile-plate structure according to claim 1 or 2, characterized in that: The prestressed concrete pipe pile comprises an annular pipe wall made of high-strength concrete, and prestressed steel bars are arranged inside the annular pipe wall.
4. The lower structure of the pile-plate structure according to claim 3, characterized in that: The cross-sectional dimension of the steel tube concrete column is smaller than or equal to the cross-sectional dimension of the prestressed concrete pipe pile, and the concrete inner core is arranged above the bottom surface of the cylindrical steel plate outer shell.
5. The lower structure of the pile-plate structure according to claim 4, characterized in that: The connecting member includes a concrete partition arranged in the inner cavity of the prestressed concrete pipe pile, a core-filled concrete body is located above the concrete partition, and anchor steel bars extending upward are arranged in the core-filled concrete body. Shear nails are arranged on the inner wall of the cylindrical steel plate shell, and the prestressed concrete pipe pile and the steel pipe concrete column are fixedly connected by a cast-in-place concrete cap.
6. The lower structure of the pile-plate structure according to claim 5, characterized in that: The size of the cast-in-place concrete cap is larger than that of the prestressed concrete pipe pile, and the top surface of the cast-in-place concrete cap is arranged above the bottom surface of the concrete core, and the bottom surface of the cast-in-place concrete cap is arranged below the top surface of the prestressed concrete pipe pile.
7. The lower structure of the pile-plate structure according to claim 4, characterized in that: The connecting member includes a closing plate arranged on the top of the prestressed concrete pipe pile, and also includes a connecting steel sleeve arranged outside the steel tube concrete column and the prestressed concrete pipe pile, and a grouting concrete body for connecting the steel tube concrete column and the prestressed concrete pipe pile is arranged in the connecting steel sleeve.
8. The lower structure of the pile-plate structure according to claim 7, characterized in that: The inner diameter of the connecting steel sleeve is larger than the outer diameter of the prestressed concrete pipe pile, and the top surface of the grouting concrete body is arranged above the bottom surface of the concrete inner core, and the bottom surface of the grouting concrete body is arranged below the closing plate.