CN211773823U

CN211773823U - Structure for increasing horizontal bearing capacity of reinforced concrete cast-in-place pile

Info

Publication number: CN211773823U
Application number: CN201922390379.2U
Authority: CN
Inventors: 贺虎成; 王洪西; 卢连成; 田廷全; 李文蕾; 陈路; 焦英立; 周霞; 刘丹
Original assignee: 63921 Troops of PLA
Current assignee: 63921 Troops of PLA
Priority date: 2019-09-30
Filing date: 2019-12-27
Publication date: 2020-10-27
Anticipated expiration: 2029-12-27

Abstract

The utility model discloses an increase structure of reinforced concrete bored concrete pile horizontal bearing capacity belongs to building structure technical field. The structure is that a new beam is added below the original bearing platform beam of two foundation piles, two ends of the new beam and the two foundation piles are respectively cast in situ by reinforced concrete, the horizontal height and the section size of the new beam are determined according to calculation and structural requirements, and the top of the foundation pile is restrained and fixedly connected through the new beam and the original bearing platform beam. The utility model discloses the foundation pile horizontal bearing capacity that detects out in can solving the actual engineering is less than the design bearing capacity, and can't increase the problem of cushion cap buried depth or add the batter pile.

Description

Structure for increasing horizontal bearing capacity of reinforced concrete cast-in-place pile

Technical Field

The utility model belongs to the technical field of building structure, concretely relates to improve structure of reinforced concrete bored concrete pile horizontal bearing capacity.

Background

The cast-in-place pile of reinforced concrete is a foundation-reinforcing engineering measure widely adopted in building engineering for the insufficient bearing capacity of foundation. The standard of foundation of building foundation requires that the characteristic value of the horizontal bearing capacity of a single pile of the reinforced concrete cast-in-place pile is determined by a field single-pile horizontal static load test. In the actual construction engineering design, the construction period and other conditions are limited, and generally, the horizontal bearing capacity of a single pile of the reinforced concrete cast-in-place pile is estimated according to a formula given by a standard, and then the horizontal bearing capacity of a test pile or an engineering pile is detected and verified on site. However, due to the complexity of engineering geology and a plurality of factors (including bending rigidity of the section of the pile body, material strength, conditions of soil on the side of the pile, the depth of the pile into the soil, constraint conditions of the pile top and the like) influencing the horizontal bearing capacity of the pile foundation of the reinforced concrete cast-in-place pile, the situation that the actually detected horizontal bearing capacity of the single pile is smaller than the estimated bearing capacity may exist in actual engineering. Sometimes limited to field conditions, horizontal forces cannot be provided by increasing the bearing platform burial depth or by providing batter piles.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an increase structure of reinforced concrete bored concrete pile horizontal bearing capacity can solve the pile foundation horizontal bearing capacity that detects out in the actual engineering and be less than the design bearing capacity, and can't increase the problem of cushion cap burial depth or add the batter pile.

A structure for increasing the horizontal bearing capacity of cast-in-place reinforced concrete pile features that a cross beam is additionally arranged under the original bearing platform beam of two foundation piles, the two ends of said cross beam and two foundation piles are cast in situ by reinforced concrete, the horizontal height and cross-section size of said cross beam are determined according to calculation and construction requirements, and the top of foundation pile is constrained and fixed by said cross beam and original bearing platform beam.

Furthermore, the distance H between the cross beam and the original bearing platform beam is required to be equal to or larger than L, and L is the center distance between two foundation piles.

Further, the cross beam section width b and the height h are related to the foundation pile diameter d as follows: h is 1.5 to 2.0b, and b is 0.5 to 0.7 d.

Has the advantages that:

1. the utility model discloses the restriction that can break through the site condition increases the construction of pile foundation level bearing capacity, has reduced the engineering volume and the construction degree of difficulty under the prerequisite of guaranteeing the bearing capacity requirement, has shortened construction cycle.

2. Because the pile bolck that former foundation pile and former cushion cap roof beam formed is connected and is regarded as articulated when pile foundation level bearing capacity calculates, the utility model discloses rationally select the interval of crossbeam and former cushion cap roof beam and the dimensional parameter in crossbeam cross-section for the pile bolck restraint of pile foundation is changed into the rigid coupling state by articulated state, has improved the level bearing capacity of pile foundation. The horizontal bearing capacity of the pile foundation provided with the one bearing platform beam and the one reinforced concrete beam is improved by 2.5-3.0 times compared with that of the one bearing platform beam.

Drawings

FIG. 1 is a schematic view of the structure of the present invention for increasing the horizontal bearing capacity of the cast-in-place reinforced concrete pile;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic cross-sectional view of the cross beam of the present invention.

Wherein, 1-new beam, 2-foundation pile I, 3-foundation pile II and 4-original bearing platform beam.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings by way of examples.

As shown in the attached drawing 1, the utility model provides an increase structure of reinforced concrete bored concrete pile horizontal bearing capacity, this structure is at foundation pile I2 and foundation pile II 3's former cushion cap roof beam 4 below increase one new crossbeam 1, new crossbeam 1's both ends adopt reinforced concrete cast-in-place shaping with foundation pile I2 and foundation pile II 3 respectively, new crossbeam 1's level and cross sectional dimension are confirmed according to calculation and construction requirement, make foundation pile I2 and II 3 top restraint formation rigid couplings of foundation pile through new crossbeam 1 and former cushion cap roof beam 4.

The center distance between the foundation pile I2 and the foundation pile II 3 is L, and the distance between the new cross beam 1 and the original bearing platform beam 4 is H.

As shown in fig. 2, foundation piles i 2 and ii 3 are cylindrical and have a diameter d.

As shown in fig. 3, the cross-section of the new beam is rectangular, with a width b and a height h.

The distance H between the new cross beam and the original bearing platform beam needs to satisfy that H is more than or equal to L, and the relation between the section width b and the height H of the new cross beam 1 and the diameter d of the pile foundation is as follows: h is 1.5 to 2.0b, and b is 0.5 to 0.7 d.

In summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for increasing the horizontal bearing capacity of cast-in-place reinforced concrete pile features that a new cross beam is additionally arranged under the original bearing platform beam of two foundation piles, the two ends of said new cross beam and two foundation piles are cast in situ by reinforced concrete, the horizontal height and cross-section size of said new cross beam are determined according to calculation and construction requirements, and the top of said foundation pile is constrained and fixed by said new cross beam and original bearing platform beam.

2. The structure for increasing the horizontal bearing capacity of the reinforced concrete cast-in-place pile as claimed in claim 1, wherein the distance H between the new beam and the original bearing platform beam is required to satisfy H ≧ L, and L is the center distance between two foundation piles.

3. The structure for increasing the horizontal bearing capacity of a reinforced concrete cast-in-place pile as claimed in claim 2, wherein the relationship between the section width b and the height h of the new cross beam and the diameter d of the pile foundation is as follows: h is 1.5-2.0 b; b is 0.5-0.7 d.