Narrow base tower assembly type prefabricated pier type foundation

Abstract

The utility model discloses a narrow base tower assembly type prefabricated pier type foundation which comprises prefabricated concrete pipe pieces and prestressed flexible ribs arranged on the prefabricated concrete pipe pieces, and a plurality of prefabricated concrete pipe pieces are rigidly connected through the prestressed flexible ribs to form a prefabricated concrete pipe internally provided with a cavity. A cavity is formed in the prefabricated concrete pipe, a concrete sealing bottom is arranged at the bottom of the cavity, the outer side of the prefabricated concrete pipe is covered with a cast-in-place concrete pier body, the cavity is filled with filler, and a cast-in-place concrete sealing top is arranged at the top of the cavity. The assembling efficiency can be effectively improved, and the whole body is more reasonable in stress.

Description

Technical Field

[0001] This utility model relates to the field of construction, and in particular to a narrow-base tower prefabricated pier foundation. Background Technology

[0002] Narrow-base prefabricated pier foundations are designed for tower sites in areas with convenient transportation, conducive to mechanized construction, and with environmental protection requirements.

[0003] The existing technology has the following drawbacks:

[0004] 1) The foundation size is relatively small, which meets the requirement of a foundation with small forces.

[0005] 2) The internal filling soil is relatively small, so it cannot be completely prefabricated and some cast-in-place concrete is still needed. Utility Model Content

[0006] In view of the above-mentioned shortcomings, this utility model provides a narrow-base tower prefabricated pier foundation, which can improve assembly efficiency.

[0007] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0008] A narrow-base prefabricated pier foundation includes prefabricated concrete segments and prestressed flexible tendons set on the prefabricated concrete segments. Several prefabricated concrete segments are rigidly connected by the prestressed flexible tendons to form a prefabricated concrete tube with an internal cavity. The bottom of the cavity is sealed with concrete. The outside of the prefabricated concrete tube is covered with a cast-in-place concrete pier body. The cavity is filled with filler material. The top of the cavity is sealed with cast-in-place concrete.

[0009] According to one aspect of this utility model, the thickness of the cast-in-place concrete pier body ranges from 500 to 1000 mm.

[0010] According to one aspect of the present invention, the precast concrete segment includes a well wall, the lower end of which has a cutting edge.

[0011] According to one aspect of the present invention, the inner side of the well wall is provided with reinforcing bars, and the well wall is connected to the bottom of the cast-in-place concrete and the top of the cast-in-place concrete via the reinforcing bars.

[0012] According to one aspect of this utility model, the thickness of the well wall is not less than 0.4 meters.

[0013] According to one aspect of this utility model, the concrete strength grade of the well wall is not lower than C30.

[0014] According to one aspect of this utility model, the bottom width of the cutting edge ranges from 0.1 to 0.2 meters.

[0015] According to one aspect of this utility model, the cutting edge is wedge-shaped.

[0016] According to one aspect of the present invention, the angle between the inner inclined surface of the cutting edge and the horizontal plane is 45° to 60°.

[0017] According to one aspect of this utility model, the length of the precast concrete segment ranges from 1 to 2.5 meters.

[0018] The advantages of this utility model are: by prefabricating the precast concrete segments in the factory, the assembly efficiency is improved; by using prestressed anchor cables to rigidly connect the precast concrete segments to form a unified whole, and then pouring the outer perimeter after assembly, the overall structure is more rationally stressed; and by using internal reinforcement, the structural stability is improved. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] 1. Cast-in-place concrete pier body; 2. Prestressed flexible reinforcement; 3. Precast concrete segments; 4. Cast-in-place concrete bottom seal; 5. Cast-in-place concrete top slab; 6. Cutting edge. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, it should be noted that the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inner", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0023] Example 1:

[0024] A narrow-base prefabricated pier foundation includes prefabricated concrete segments 3 and prestressed flexible reinforcing bars 2 installed on the prefabricated concrete segments 3. Several prefabricated concrete segments 3 are rigidly connected by the prestressed flexible reinforcing bars 2 to form a prefabricated concrete tube with an internal cavity. The bottom of the cavity is sealed with concrete, and the outside of the prefabricated concrete tube is covered with a cast-in-place concrete pier body 1. The cavity is filled with filler material, and the top of the cavity is sealed with cast-in-place concrete. In use, the prefabricated concrete segments 3 are assembled to form a barrel-shaped cavity structure. The prefabricated concrete segments 3 are prefabricated in a factory and rigidly connected by prestressed anchor cables. The inside is filled with waste soil and slag, and the outside is poured with fine stone concrete, forming a solid and stable structure consisting of the outer concrete (i.e., the cast-in-place concrete pier body 1), the cavity, and the waste soil and slag.

[0025] In this embodiment, the product uses C40 grade, with an upper opening diameter of 1m-1.8m and a concrete bottom sealing diameter in the range of 2.5-4m. The size of a single component (i.e., precast concrete segment 3) is controlled between 1m and 1.5m, and the weight is controlled between 1-2.5t, which facilitates transportation and hoisting.

[0026] In practical applications, the thickness of the cast-in-place concrete pier body 1 ranges from 500 to 1000 mm.

[0027] In practical applications, the precast concrete segment 3 includes a well wall, the lower end of which has a cutting edge 6. The well wall serves to retain soil and water, and overcomes the frictional resistance between the soil and the well wall using its own weight. After construction is completed, it can transfer the upper load to the foundation.

[0028] The construction process of caissons using a simultaneous excavation and sinking technique is adopted: small excavators are used to excavate the soil, and the caissons are sank to a certain height by overcoming the frictional resistance of the caisson wall under their own weight. Then, precast segments are assembled and spliced ​​on site.

[0029] In practical applications, the inner side of the well wall is reinforced with steel bars, and the well wall is connected to the cast-in-place concrete bottom seal 4 and the cast-in-place concrete top seal respectively through the steel bars.

[0030] In practical applications, the thickness of the well wall should not be less than 0.4 meters.

[0031] In practical applications, the concrete strength grade of the well wall should not be lower than C30.

[0032] In this embodiment, the bottom width of the cutting edge 6 ranges from 0.1 to 0.2 meters. The width parameter can also be modified according to the hardness or softness of the ground in actual contact with the cutting edge 6.

[0033] In practical applications, the cutting edge 6 is wedge-shaped. The wedge shape facilitates sinking.

[0034] When the sinking depth is large and the soil is hard, the bottom surface of the cutting edge 6 should be reinforced with shaped steel (angle steel or channel steel) to prevent damage to the cutting edge 6.

[0035] In practical applications, the angle between the inner inclined surface of the cutting edge 6 and the horizontal plane is 45° to 60°.

[0036] In practical applications, the length of the precast concrete segment 3 ranges from 1 to 2.5 meters.

[0037] The concrete base needs to withstand the reaction forces from the foundation soil and water, which requires a certain thickness. For rock foundations, a C25 strength grade concrete base should be used; for general foundations, a C30 strength grade concrete base should be used.

[0038] The beneficial effects of this embodiment are as follows: by prefabricating the precast concrete segments 3 in the factory, the assembly efficiency is improved; by using prestressed anchor cables to rigidly connect the precast concrete segments 3 to form a unified whole, and then pouring the outer perimeter after assembly, the overall structure is more rationally stressed; and by using internal reinforcement, the structural stability is improved.

[0039] The above description is merely a specific embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A narrow footing tower assembly type precast pier foundation, characterized by, The precast concrete segment (3) and the prestressed flexible tendon (2) arranged on the precast concrete segment (3), a plurality of precast concrete segments (3) are rigidly connected by the prestressed flexible tendon (2) to form a precast concrete pipe with a cavity, the bottom of the cavity is provided with a concrete bottom sealing (4), the outer side of the precast concrete pipe is covered with a cast-in-situ concrete pier body (1), the cavity is filled with a filler, and the top of the cavity is provided with a cast-in-situ concrete top sealing.

2. A narrow footing tower assembly type precast pier foundation according to claim 1, characterized in that, The thickness of the cast-in-situ concrete pier body (1) is 500-1000 mm.

3. A narrow footing tower assembly type precast pier foundation according to claim 1, characterized in that, The precast concrete segment (3) comprises a well wall, and the lower end of the well wall is provided with a blade foot (6).

4. A narrow base tower assembly type precast pier foundation according to claim 1, characterized in that, The inside of the concrete pipe is provided with a steel bar, and the concrete pipe is connected with the cast-in-situ concrete bottom sealing (4) and the cast-in-situ concrete top sealing through the steel bar.

5. A narrow base tower assembly type precast pier foundation according to claim 3, characterized in that, The thickness of the well wall is not less than 0.4 m.

6. A narrow base tower assembly type precast pier foundation according to claim 3, characterized in that, The concrete strength grade of the well wall is not less than C30.

7. A narrow base tower assembly type precast pier foundation according to claim 3, characterized in that, The bottom surface width of the blade foot (6) is 0.1-0.2 m.

8. A narrow base tower assembly type precast pier foundation according to claim 3, characterized in that, The shape of the blade foot (6) is wedge-shaped.

9. A narrow base tower assembly type precast pier foundation according to claim 3, characterized in that, The included angle between the inner side inclined surface of the blade foot (6) and the horizontal plane is 45-60°.

10. The narrow base tower assembly type precast pier foundation according to any one of claims 1 to 9, characterized in that, The length of the precast concrete segment (3) is 1-2.5 m.

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