CN112012236B - Bridge foundation construction method for old city reconstruction - Google Patents

Abstract

The invention provides a bridge foundation construction method for old city reconstruction, which comprises the following steps: s1, excavating and lifting earth and stone, excavating a pile foundation space for embedding a bridge foundation on the ground of an old city area, lifting the earth and stone from inside to outside, and lifting the earth and stone out normally due to the fact that anchor cables are embedded below the old city area; s2, mounting steel pile casings, dividing one steel pile casing into a plurality of blocks to manufacture, assembling in pile holes, and avoiding the influence on anchor cables in piles; s3, installing a reinforcement cage; s4, pouring a concrete pile foundation, and under the condition that buildings are arranged around a high slope, when a highway bridge foundation is built, the method and the device can solve the technical problem that the retaining wall anchor cables and the retaining wall lattice beams collide with the pile foundation, and guarantee the construction efficiency and the construction quality of the bridge foundation.

Description

Bridge foundation construction method for old city reconstruction

Technical Field

The invention belongs to the technical field of bridge foundation construction, and particularly relates to a bridge foundation construction method for old city reconstruction.

Background

During the construction of the pile foundation of the urban road engineering bridge, when the pile foundation is formed into a hole and excavated to 18.5 meters, a group of gravity anchor cables consisting of seven steel wire ropes appears in the hole and is positioned at the position of the hole diameter 1/3. Dig 23.4 meters and appear four wire rope again and be a set of anchor rope, be located hole diameter 1/2 department, according to the deep requirement of design stake, stake well excavation depth should be 29 meters, because the house has been built around the construction site, in addition carry out urban road bridge construction on high slope, the construction road is unable current, the construction degree of difficulty is very big, consequently, await an urgent need an advanced technique to solve the technical problem that exists among the prior art.

Disclosure of Invention

In order to solve the technical problem, an embodiment of the invention provides a bridge foundation construction method for old city reconstruction, which comprises the following steps:

s1, excavating and lifting earth and stone, excavating a pile foundation space for embedding a bridge foundation on the ground of an old city area, lifting the earth and stone from inside to outside, and lifting the earth and stone out normally due to the fact that anchor cables are embedded below the old city area;

s2, installing steel pile casings, wherein due to the fact that anchor cables are dug in the piles, the steel pile casings in the piles are obstructed by the anchor cables when going into a well, so that one steel pile casing is divided into a plurality of steel pile casings to be manufactured, and the steel pile casings are assembled in pile holes to avoid influences on the anchor cables in the piles;

s3, installing a reinforcement cage, wherein the reinforcement is firstly processed by wire enclosing in a manufacturing field, manually lifted to a pile wellhead lifting frame body, then a disc element stirrup and a reinforcing hoop are placed at the bottom of a pile hole below an anchor cable, then a main reinforcement is manually lifted to the pile wellhead for mechanical connection, then a hoist hook is used for placing the main reinforcement into a pile well to the bottom of the pile, the hoist hook stably lifts the main reinforcement cage, a worker enters the pile well to firmly bind the reinforcing stirrup with iron wires, and an outer stirrup is bound from the bottom of the pile to the position of the anchor cable;

and S4, pouring a concrete pile foundation, and pouring concrete into the reinforcement cage.

Further, in the process of excavating the earth and stone in S1, two transversely laid anchor cables, namely seven steel strand type anchor cables and four steel strand type anchor cables, are exposed from top to bottom, and the vertical distance between the two anchor cables is 4.5-5.5 m.

Furthermore, after the excavation and the lifting of the earth and stone are finished, the steel strands of the two anchor cables excavated in the pile are derusted, then the asphalt primer is brushed, and the PE sleeve is sleeved on the outer surface of the pile after the two layers of the steel strands are wrapped by the asphalt glass fiber cloth.

Further, butter is adopted to fill and compact in the range of 100-mm and 200-mm lengths at two ends of the free section of the PE sleeve, and finally the outer surface of the PE sleeve is completely wrapped and tied with engineering adhesive plaster to be firmly sealed.

Further, in S2, the method specifically includes the following steps:

(1) after the steel casing is customized by a manufacturer, the steel casing is transported to a construction site by a vehicle, anti-corrosion paint is manually brushed, the steel casing is manually lifted to a built lifting frame after being dried, a customized steel bar hanging basket is put into a pile well, and the special-shaped casing is put into the pile well in a blocking mode by a lifter;

(2) after the steel casing is placed into the pile well, two installation personnel are sent to carry a safety belt and enter the pile well through a lifting machine provided with a falling protector, stand in a steel bar hanging basket, assemble the steel casing from the lower part of a first group of anchor cables from top to bottom, avoid the stress influence on the anchor cables until the upper part of a second group of anchor cables, and then continue to assemble the steel casing from the lower part of the second group of anchor cables from top to bottom until the upper part of the pile bottom;

(3) in order to assemble the steel casing, an I-shaped iron derrick platform is erected beside the pile well mouth, and the steel casing is fixed by the four-side mounted hoist lifting hook and is connected with a bolt;

(4) except for the position with the anchor cable, the method is adopted, other steel casing cylinders are placed to a pile well mouth by using the hoist lifting hook, are welded and connected after being fixed, and are manually placed into the well in sequence for installation.

Further, in S3, the method specifically includes the following steps:

(1) firstly, manufacturing a wire wrapping treatment in a manufacturing field, manually lifting the wire wrapping treatment on a lifting machine frame body of a pile wellhead, then putting disc element stirrups and reinforcing hoops at the bottom of a pile hole below four steel strand type anchor cables, manually lifting main steel bars to the pile wellhead for mechanical connection, then putting the main steel bars into a pile bottom by using a hoist lifting hook, stably lifting a main steel reinforcement cage by using the hoist lifting hook, firmly binding the reinforcing stirrups by using iron wires when workers enter the pile well, and binding outer stirrups to the positions of the four steel strand type anchor cables from the pile bottom upwards;

(2) the distance between seven steel strand wires type anchor ropes and four steel strand wires type anchor ropes is 5 meters, and the reinforcement cage in this section region between seven steel strand wires type anchor ropes and four steel strand wires type anchor ropes cuts off the stirrup outside the well in advance, then wears to wind the ligature in the stake well through the manual work, strengthens stirrup and reaches seven steel strand wires type anchor rope departments with the iron wire ligature, and seven steel strand wires type anchor ropes are above up to this section region of well head, strengthens the stirrup and passes through welded connection.

The invention has the beneficial effects that:

under the condition that houses are arranged around a high slope, when a highway bridge foundation is built, the technical problem that retaining wall anchor cables and retaining wall lattice beams collide with a pile foundation can be solved, and the construction efficiency and the construction quality of the bridge foundation are guaranteed.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a flowchart of a bridge foundation construction method for old city reconstruction in an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1, fig. 1 is a flowchart of a bridge foundation construction method for old city reconstruction in an embodiment of the present invention, where the construction method includes the following steps:

s1, excavating and lifting earth and stone, excavating a pile foundation space for embedding a bridge foundation on the ground of an old city area, lifting the earth and stone from inside to outside, and lifting the earth and stone out normally due to the fact that anchor cables are embedded below the old city area;

s2, installing steel pile casings, wherein due to the fact that anchor cables are dug in the piles, the steel pile casings in the piles are obstructed by the anchor cables when going into a well, so that one steel pile casing is divided into a plurality of steel pile casings to be manufactured, and the steel pile casings are assembled in pile holes to avoid influences on the anchor cables in the piles;

s3, installing a reinforcement cage, wherein the reinforcement is firstly processed by wire enclosing in a manufacturing field, manually lifted to a pile wellhead lifting frame body, then a disc element stirrup and a reinforcing hoop are placed at the bottom of a pile hole below an anchor cable, then a main reinforcement is manually lifted to the pile wellhead for mechanical connection, then a hoist hook is used for placing the main reinforcement into a pile well to the bottom of the pile, the hoist hook stably lifts the main reinforcement cage, a worker enters the pile well to firmly bind the reinforcing stirrup with iron wires, and an outer stirrup is bound from the bottom of the pile to the position of the anchor cable;

and S4, pouring a concrete pile foundation, and pouring concrete into the reinforcement cage.

In some preferred embodiments, during the excavation of the earth and stone in S1, two cables, seven steel strand cables and four steel strand cables, are exposed from top to bottom, and the vertical distance between the two cables is 4.5-5.5 m.

In some preferred embodiments, after the earth and stone excavation and hoisting are finished, the steel strands of the two anchor cables excavated in the pile are derusted, then the asphalt primer is brushed, and after the two layers of the steel strands are wrapped by the asphalt glass fiber cloth, the PE casing pipe is sleeved on the outer surface of the steel strands.

In other preferred embodiments, butter is adopted to fill and compact within the range of 100-200 mm lengths at both ends of the free section of the PE sleeve, and finally the outer surface of the PE sleeve is completely wrapped with engineering adhesive plaster for firm sealing treatment.

In some preferred embodiments, in S2, the following steps are specifically included:

(1) after the steel casing is customized by a manufacturer, the steel casing is transported to a construction site by a vehicle, anti-corrosion paint is manually brushed, the steel casing is manually lifted to a built lifting frame after being dried, a customized steel bar hanging basket is put into a pile well, and the special-shaped casing is put into the pile well in a blocking mode by a lifter;

(2) after the steel casing is placed into the pile well, two installation personnel are sent to carry a safety belt and enter the pile well through a lifting machine provided with a falling protector, stand in a steel bar hanging basket, assemble the steel casing from the lower part of a first group of anchor cables from top to bottom, avoid the stress influence on the anchor cables until the upper part of a second group of anchor cables, and then continue to assemble the steel casing from the lower part of the second group of anchor cables from top to bottom until the upper part of the pile bottom;

(3) in order to assemble the steel casing, an I-shaped iron derrick platform is erected beside the pile well mouth, and the steel casing is fixed by the four-side mounted hoist lifting hook and is connected with a bolt;

(4) except for the position with the anchor cable, the method is adopted, other steel casing cylinders are placed to a pile well mouth by using the hoist lifting hook, are welded and connected after being fixed, and are manually placed into the well in sequence for installation.

In some preferred embodiments, in S3, the following steps are specifically included:

(1) firstly, manufacturing a wire wrapping treatment in a manufacturing field, manually lifting the wire wrapping treatment on a lifting machine frame body of a pile wellhead, then putting disc element stirrups and reinforcing hoops at the bottom of a pile hole below four steel strand type anchor cables, manually lifting main steel bars to the pile wellhead for mechanical connection, then putting the main steel bars into a pile bottom by using a hoist lifting hook, stably lifting a main steel reinforcement cage by using the hoist lifting hook, firmly binding the reinforcing stirrups by using iron wires when workers enter the pile well, and binding outer stirrups to the positions of the four steel strand type anchor cables from the pile bottom upwards;

(2) the distance between seven steel strand wires type anchor ropes and four steel strand wires type anchor ropes is 5 meters, and the reinforcement cage in this section region between seven steel strand wires type anchor ropes and four steel strand wires type anchor ropes cuts off the stirrup outside the well in advance, then wears to wind the ligature in the stake well through the manual work, strengthens stirrup and reaches seven steel strand wires type anchor rope departments with the iron wire ligature, and seven steel strand wires type anchor ropes are above up to this section region of well head, strengthens the stirrup and passes through welded connection.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims (6)

1. A bridge foundation construction method for old city reconstruction is characterized by comprising the following steps: the method comprises the following steps:

s1, excavating and lifting earth and stone, excavating a pile foundation space for embedding a bridge foundation on the ground of an old city area, lifting the earth and stone from inside to outside, and lifting the earth and stone out normally due to the fact that anchor cables are embedded below the old city area;

s2, installing steel pile casings, wherein due to the fact that anchor cables are dug in the piles, the steel pile casings in the piles are obstructed by the anchor cables when going into a well, so that one steel pile casing is divided into a plurality of steel pile casings to be manufactured, and the steel pile casings are assembled in pile holes to avoid influences on the anchor cables in the piles;

s3, installing a reinforcement cage, wherein the reinforcement is firstly processed by wire enclosing in a manufacturing field, manually lifted to a pile wellhead lifting frame body, then a disc element stirrup and a reinforcing hoop are placed at the bottom of a pile hole below an anchor cable, then a main reinforcement is manually lifted to the pile wellhead for mechanical connection, then a hoist hook is used for placing the main reinforcement into a pile well to the bottom of the pile, the hoist hook stably lifts the main reinforcement cage, a worker enters the pile well to firmly bind the reinforcing stirrup with iron wires, and an outer stirrup is bound from the bottom of the pile to the position of the anchor cable;

and S4, pouring a concrete pile foundation, and pouring concrete into the reinforcement cage.

2. The bridge foundation construction method for old city reconstruction according to claim 1, wherein: in the process of excavating the earth and stone in the S1, two transversely laid anchor cables, namely seven steel strand type anchor cables and four steel strand type anchor cables are exposed from top to bottom, and the vertical distance between the two anchor cables is 4.5-5.5 m.

3. The bridge foundation construction method for old city reconstruction as claimed in claim 2, wherein: after the excavation and the lifting of the earth and stone are finished, the steel strands of the two anchor cables excavated in the pile are derusted, then the asphalt primer is brushed, and after the two layers are wrapped by the asphalt glass fiber cloth, the PE sleeve is sleeved on the outer surface of the pile.

4. The bridge foundation construction method for old city reconstruction as claimed in claim 3, wherein: and filling and compacting butter within the length range of 100-200 mm at the two ends of the free section of the PE sleeve, and finally, tightly sealing the outer surface of the PE sleeve by fully winding and binding the engineering adhesive plaster.

5. The bridge foundation construction method for old city reconstruction as claimed in claim 2, wherein: in S2, the method specifically includes the following steps:

(1) after the steel casing is customized by a manufacturer, the steel casing is transported to a construction site by a vehicle, anti-corrosion paint is manually brushed, the steel casing is manually lifted to a built lifting frame after being dried, a customized steel bar hanging basket is put into a pile well, and the special-shaped casing is put into the pile well in a blocking mode by a lifter;

(2) after the steel casing is placed into the pile well, two installation personnel are sent to carry a safety belt and enter the pile well through a lifting machine provided with a falling protector, stand in a steel bar hanging basket, assemble the steel casing from the lower part of a first group of anchor cables from top to bottom, avoid the stress influence on the anchor cables until the upper part of a second group of anchor cables, and then continue to assemble the steel casing from the lower part of the second group of anchor cables from top to bottom until the upper part of the pile bottom;

(3) in order to assemble the steel casing, an I-shaped iron derrick platform is erected beside the pile well mouth, and the steel casing is fixed by the four-side mounted hoist lifting hook and is connected with a bolt;

(4) except for the position with the anchor cable, the method is adopted, other steel casing cylinders are placed to a pile well mouth by using the hoist lifting hook, are welded and connected after being fixed, and are manually placed into the well in sequence for installation.

6. The bridge foundation construction method for old city reconstruction as claimed in claim 2, wherein: in S3, the method specifically includes the following steps:

(1) firstly, manufacturing a wire wrapping treatment in a manufacturing field, manually lifting the wire wrapping treatment on a lifting machine frame body of a pile wellhead, then putting disc element stirrups and reinforcing hoops at the bottom of a pile hole below four steel strand type anchor cables, manually lifting main steel bars to the pile wellhead for mechanical connection, then putting the main steel bars into a pile bottom by using a hoist lifting hook, stably lifting a main steel reinforcement cage by using the hoist lifting hook, firmly binding the reinforcing stirrups by using iron wires when workers enter the pile well, and binding outer stirrups to the positions of the four steel strand type anchor cables from the pile bottom upwards;

(2) the distance between seven steel strand wires type anchor ropes and four steel strand wires type anchor ropes is 5 meters, and the reinforcement cage in this section region between seven steel strand wires type anchor ropes and four steel strand wires type anchor ropes cuts off the stirrup outside the well in advance, then wears to wind the ligature in the stake well through the manual work, strengthens stirrup and reaches seven steel strand wires type anchor rope departments with the iron wire ligature, and seven steel strand wires type anchor ropes are above up to this section region of well head, strengthens the stirrup and passes through welded connection.

Images