Deformable and coordinated pre-tensioning I-shaped beam pedestal foundation
By designing a deformable and coordinated structure in the I-beam base foundation, including a square pile group connected by concrete cushion layer, pebble isolation layer and annular clamping hoop, the problem of wear and deformation of square piles in the prior art is solved, and a longer service life and lower construction costs are achieved.
Patent Information
- Application Number
- CN202421552121.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-03
AI Technical Summary
The existing fully assembled self-anchor type I-beam construction pedestal system leads to wear of square pile concrete, change in elevation, local stress cracking, and damage to the bottom cushion layer during prestressing tensioning and temperature changes.
A deformable and coordinated I-beam base foundation is designed, including a concrete cushion layer located at the bottom, a pebble isolation layer laid above and a square pile group arranged above the pebble isolation layer. The square pile group is connected by an annular hoop, and the square piles are filled with epoxy resin glue to increase bending resistance.
The sliding of pebbles improves deformation coordination ability, avoids cracks in the pedestal system, extends the service life of the rectangular pile foundation, saves costs, and is suitable for other prestressed beam pedestals, which are convenient for construction.
Smart Images
Figure CN222874913U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of building construction, and particularly relates to a deformable and coordinated pre-tensioned I-beam pedestal foundation. Background Art
[0002] At present, prefabricated prestressed I-beams are widely used in bridge engineering. The existing fully assembled self-anchored pre-tensioned I-beam construction pedestal system consists of supporting steel pipes, anti-pullout hoops, cluster hoops, square piles, etc. When the prestress is stretched and the temperature changes, the square piles at the foundation of the beam pedestal generate kinetic energy, but due to the constraints of the lower cushion layer and the earthwork on both sides, the square piles cannot slide autonomously, which is prone to problems such as wear of the square pile concrete, elevation changes, local stress cracking, and damage to the bottom cushion layer.
[0003] In summary, the existing fully assembled self-anchored pre-tensioned I-beam construction pedestal system has problems such as wear of the square pile concrete of the beam pedestal foundation, elevation change, local stress cracking, and damage to the bottom cushion layer. Therefore, a deformable and coordinated pre-tensioned I-beam pedestal foundation is provided. Utility Model Content
[0004] The utility model aims to provide a deformable and coordinated pre-tensioned I-beam pedestal foundation.
[0005] The utility model is realized by the following measures: a deformable and coordinated pre-tensioned I-beam pedestal foundation, characterized in that it comprises a concrete cushion layer at the bottom, a pebble isolation layer laid on the concrete cushion layer, and a square pile group arranged on the pebble isolation layer, wherein the square pile group comprises a plurality of square piles;
[0006] It also includes an annular hoop connecting all the square piles, and a plurality of the annular hoop are arranged at intervals along the length direction of the square pile group.
[0007] The annular clamp comprises a U-shaped top clamp and a U-shaped bottom clamp, and the U-shaped top clamp and the U-shaped bottom clamp are connected by a plurality of bolts.
[0008] The open end of the U-shaped bottom hoop faces upward, and the bottom plate of the U-shaped bottom hoop is located between the square pile group and the pebble isolation layer.
[0009] The square pile group comprises a plurality of upper and lower layers, and epoxy resin glue is filled between adjacent layers.
[0010] Each layer consists of 4 square piles placed side by side, with the gap between two adjacent square piles not exceeding 5 mm.
[0011] The concrete cushion is made of C25 ordinary silicate concrete, with a width of generally 2.8m, a length depending on the length of the square pile, and a thickness of generally 100mm.
[0012] A plurality of steel pads are arranged between the side walls of the square pile group and the inner wall of the annular hoop.
[0013] The steel pads are arranged at the joints of adjacent layers.
[0014] The pebble isolation layer uses pebbles with a particle size of 3 to 4 mm.
[0015] The square piles are PHS400 piles, and the length of a single square pile is 12m-15m.
[0016] The top clamp and the bottom clamp are generally made of 8mm thick steel plates.
[0017] The width of the pebble isolation layer is generally 2.5m, the length is determined by the length of the square piles, and the thickness is 100mm.
[0018] A construction method of a deformable and coordinated pre-tensioned I-beam pedestal foundation is as follows:
[0019] The first step is to determine the trench size based on the size of the I-beam foundation square piles and the lower cushion layer, and excavate the trench. Manual excavation is used within 200mm of the trench bottom to prevent over-excavation and disturbance of the land.
[0020] The second step is to level and compact the bottom of the trench, pour the concrete cushion layer, use C25 ordinary silicate concrete, pouring thickness of 100mm, and manually smooth the surface.
[0021] The third step is to lay a pebble isolation layer in the center of the top of the concrete cushion layer, using pebbles with a particle size of 3 to 4 mm. The pebble isolation layer is 2.5 meters wide and 100 mm thick.
[0022] The fourth step is to place the square pile group in the center on the pebble isolation layer. Each pedestal foundation section is equipped with 8 PHS400 square piles, 4 on top and 4 on the bottom. The length of a single square pile is 12m or 15m. The square piles are extended with steel hoops and connecting pins, and the top and bottom hoops are connected with bolts. The square piles should be placed closely, and the gap between adjacent piles should not exceed 5mm. In order to increase the overall bending resistance of the foundation, epoxy resin glue is used to bond the upper and lower square piles.
[0023] The fifth step is to backfill the side walls of the square piles and make the pile top elevation the same as the existing hardened ground.
[0024] Step 6: Construction of the superstructure of the I-beam pedestal.
[0025] The technical solution provided by the embodiment of the utility model has the following beneficial effects: when the prefabricated beam is tensioned, the sliding of pebbles can improve the deformation coordination ability and avoid the occurrence of cracks in the pedestal system; the service life of the square pile foundation is increased and the cost is saved; it can also be applied to other prestressed beam pedestals according to the use requirements, with strong adaptability and convenient construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solution of the present utility model, a brief introduction will be given to the drawings used in the embodiments below. Obviously, the drawings listed below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 It is a front view of an embodiment of the utility model;
[0028] Figure 2 It is a side view of an embodiment of the utility model.
[0029] In the attached drawings, the components represented by the various reference numerals are listed as follows: 1. Concrete cushion layer; 2. Bottom hoop; 3. Square pile group; 4. Epoxy resin glue; 5. Top hoop; 6. Steel pad; 7. Bolt; 8. Pebble isolation layer. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0031] See also Figure 1-Figure 2 A deformable and coordinated pre-tensioned I-beam pedestal foundation, characterized in that it comprises a concrete cushion layer 1 at the bottom, a pebble isolation layer 8 laid on the concrete cushion layer 1, and a square pile group 3 arranged on the pebble isolation layer 8, wherein the square pile group 3 comprises a plurality of square piles;
[0032] It also includes an annular hoop connecting all the square piles, and a plurality of annular hoop are arranged at intervals along the length direction of the square pile group 3.
[0033] The annular clamp comprises a U-shaped top clamp 5 and a U-shaped bottom clamp 2 , and the U-shaped top clamp 5 and the U-shaped bottom clamp 2 are connected by a plurality of bolts 7 .
[0034] The open end of the U-shaped bottom hoop 2 faces upward, and the bottom plate of the U-shaped bottom hoop 2 is located between the square pile group 3 and the pebble isolation layer 8.
[0035] The square pile group 3 includes a plurality of upper and lower layers, and epoxy resin glue 4 is filled between adjacent layers.
[0036] Each layer consists of 4 square piles placed side by side, with the gap between two adjacent square piles not exceeding 5 mm.
[0037] The concrete cushion layer 1 is made of C25 ordinary silicate concrete, wherein the width is generally 2.8m, the length is determined by the length of the square pile, and the thickness is generally 100mm.
[0038] A plurality of steel pads 6 are arranged between the side walls of the square pile group 3 and the inner wall of the annular hoop.
[0039] Steel pads 6 are provided at the joints of adjacent layers.
[0040] The pebble isolation layer 8 is made of pebbles with a particle size of 3 to 4 mm.
[0041] The square piles used are PHS400 piles, and the length of a single square pile is 12m-15m.
[0042] The top clamp 5 and the bottom clamp 2 are generally made of 8 mm thick steel plates.
[0043] The width of the pebble isolation layer 8 is generally 2.5m, the length is the same as the length of the square piles, and the thickness is 100mm.
[0044] A construction method of a deformable and coordinated pre-tensioned I-beam pedestal foundation is as follows:
[0045] The first step is to determine the trench size based on the size of the I-beam foundation square piles and the lower cushion layer, and excavate the trench. Manual excavation is used within 200mm of the trench bottom to prevent over-excavation and disturbance of the land.
[0046] The second step is to level and compact the bottom of the trench, pour the concrete cushion layer 1, use C25 ordinary silicate concrete, pouring thickness of 100mm, and manually smooth the surface.
[0047] The third step is to lay a pebble isolation layer 8 in the center of the upper part of the concrete cushion layer 1, using pebbles with a particle size of 3 to 4 mm. The pebble isolation layer 8 is 2.5 m wide and 100 mm thick.
[0048] The fourth step is to place the square pile group 3 in the center on the pebble isolation layer 8. Each pedestal foundation section is equipped with 8 PHS400 square piles, 4 of which are stacked on top and bottom. The length of a single square pile is 12m or 15m. The square piles are extended by steel hoops and connecting pins. The top hoop 5 and the bottom hoop 2 are connected by bolts 7. The square piles should be placed closely, and the gap between adjacent piles should not be greater than 5mm. In order to increase the overall bending resistance of the foundation, epoxy resin glue 4 is used to bond the upper and lower square piles.
[0049] The fifth step is to backfill the side walls of the square piles and make the pile top elevation the same as the existing hardened ground.
[0050] Step 6: Construction of the superstructure of the I-beam pedestal.
[0051] 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 deformable and coordinated pre-tensioned I-beam pedestal foundation, characterized in that: It includes a concrete cushion layer at the bottom, a pebble isolation layer laid on the concrete cushion layer, and a square pile group arranged on the pebble isolation layer, wherein the square pile group includes a plurality of square piles; It also includes an annular hoop connecting all the square piles, and a plurality of the annular hoop are arranged at intervals along the length direction of the square pile group.
2. The pre-tensioned I-beam pedestal foundation according to claim 1, characterized in that: The annular clamp comprises a U-shaped top clamp and a U-shaped bottom clamp, and the U-shaped top clamp and the U-shaped bottom clamp are connected by a plurality of bolts.
3. The pre-tensioned I-beam pedestal foundation according to claim 2, characterized in that: The open end of the U-shaped bottom hoop faces upward, and the bottom plate of the U-shaped bottom hoop is located between the square pile group and the pebble isolation layer.
4. The pre-tensioned I-beam pedestal foundation according to claim 1, characterized in that: The square pile group comprises a plurality of upper and lower layers, and epoxy resin glue is filled between adjacent layers.
5. The pre-tensioned I-beam pedestal foundation according to claim 4, characterized in that: Each layer consists of 4 square piles placed side by side.
6. The pre-tensioned I-beam pedestal foundation according to claim 1, characterized in that: The concrete cushion layer is made of C25 ordinary silicate concrete.
7. The pre-tensioned I-beam pedestal foundation according to claim 4, characterized in that: A plurality of steel pads are arranged between the side walls of the square pile group and the inner wall of the annular hoop.
8. The pre-tensioned I-beam pedestal foundation according to claim 7, characterized in that: The steel pads are arranged at the joints of adjacent layers.
9. The pre-tensioned I-beam pedestal foundation according to claim 7, characterized in that: The pebble isolation layer uses pebbles with a particle size of 3 to 4 mm.
10. The pre-tensioned I-beam pedestal foundation according to claim 1, characterized in that: The gap between two adjacent square piles shall not exceed 5mm.