CN111254966A - Bridge abutment and pier-column foundation structure in mountainous area and its construction method - Google Patents

Abstract

The application discloses a mountain area abutment and pier stud foundation structure and a construction method thereof. The foundation structure of the abutment and the pier stud in the mountainous area comprises an enlarged foundation and an anchoring body. A steel reinforcement framework is arranged in the enlarged foundation, one end of the anchoring body is anchored in a foundation pit of the mountain body, and the lower surface of the enlarged foundation is connected with the other end of the anchoring body. The technical scheme that this application provided can solve the problem that construction and operation risk are big that are difficult to of current mountain area bridge pile foundation.

Description

Bridge abutment and pier-column foundation structure in mountainous area and its construction method

technical field

The present application relates to the technical field of civil engineering, in particular, to a bridge abutment and a pier-column foundation structure in a mountainous area and a construction method thereof.

Background technique

With the continuous development of my country's transportation industry, the investment in highway construction in mountainous areas is also increasing. Road construction mainly involves roads, bridges and tunnels, especially in areas with large terrain differences, bridges play an irreplaceable role.

In bridge engineering, the foundation is an important part of the substructure of the bridge, which transmits the upper load to the foundation and is the main stress-bearing part of the bridge. The foundations of bridges in mountainous areas are mainly pile foundations. Due to the complex terrain in mountainous areas, especially on hillsides, large-scale machinery is difficult to construct. The pile foundations are often constructed by manually digging holes, but the construction of this process is dangerous.

SUMMARY OF THE INVENTION

The present application provides a bridge abutment and pier column foundation structure in mountainous areas and a construction method thereof, so as to solve the problems of difficulty in construction and high operational risk of existing bridge pile foundations in mountainous areas.

In a first aspect, the present application provides an abutment and pier foundation structure in a mountainous area, including an enlarged foundation and anchors. The inside of the enlarged foundation is provided with a reinforced skeleton, one end of the anchor is anchored in the foundation pit of the mountain, and the lower surface of the enlarged foundation is connected with the other end of the anchor.

In the above scheme, a bridge abutment and a pier-column foundation structure in a mountainous area are provided. The base structure includes enlarged foundations and anchors. Compared with the existing pile foundation structure, the mountain bridge abutment and pier column foundation structure provided by the above scheme can be easily constructed, and the construction risk is small. At the same time, through the anchors, the enlarged foundation can not only bear the vertical force, but also can effectively resist the horizontal force, and has good anti-overturning property. to ensure the stability of the bridge.

Optionally, in a possible implementation manner, the anchor is an anchor rod or an anchor cable.

Optionally, in a possible implementation manner, the anchoring body is a prestressed structure.

Optionally, in a possible implementation manner, one end of the anchoring body penetrates the lower surface of the enlarged foundation and is embedded in the interior of the enlarged foundation.

Optionally, in a possible implementation manner, the enlarged foundation is a stepped or conical reinforced concrete structure.

Optionally, in a possible implementation manner, the upper surface of the enlarged foundation is provided with a platform body or a pier body.

In the second aspect, the application also provides a construction method for a bridge abutment and a pier-column foundation in a mountainous area, the method comprising:

Anchor body construction, the anchor body construction steps include: installing the anchor body in the foundation pit of the mountain;

Expanded foundation construction, the expanded foundation construction steps include: tying steel bars in the foundation pit, pouring concrete in vertical form, and curing to form the expanded foundation; and

The anchor rod is tensioned, and the anchor rod tensioning step includes: tensioning the anchor body and sealing the anchor.

Optionally, in a possible implementation manner, the method further includes:

Site leveling steps and foundation excavation steps;

The site leveling steps include: excavating the mountain to form a flat excavation surface;

The steps of foundation excavation include: excavating the foundation pit according to the ground elevation of the enlarged foundation.

Optionally, in a possible implementation manner, the foundation excavation step further includes: when the excavation surface is 30cm away from the design elevation, manual excavation is used.

Optionally, in a possible implementation, the anchor is an anchor rod or an anchor cable;

The construction steps of the enlarged foundation also include: reserving an anchor rod hole or an anchor cable hole inside the enlarged foundation.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the structural schematic diagram of the bridge abutment and the pier-column foundation structure in the present embodiment;

Fig. 2 is the structural representation when being the platform body on the basis of expansion in this embodiment;

Fig. 3 is the structural schematic diagram when the enlarged foundation is the pier body in the present embodiment;

Fig. 4-Fig. 7 is the schematic diagram of the construction method of a kind of mountain abutment and pier column foundation in the present embodiment.

Icons: 10-Basic structure of abutments and piers in mountainous areas; 11-Enlarged foundation; 12-Anchor body; 20-Abutment body; 21-Abutment cap; 30- Pier body; 40-Excavation mountain body; 41-Slope line; 42-excavation face; 43-foundation pit; 44-drilling hole; 110-first part; 111-second part.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the embodiments of the present application, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by "" etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that is usually placed when the application product is used, or the orientation or positional relationship that is commonly understood by those skilled in the art, It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed The connection can also be a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other under the condition of no conflict.

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The present embodiment provides an abutment and pier foundation structure 10 in a mountainous area, so as to solve the problems of difficult construction and high operation risk of the existing bridge pile foundation in a mountainous area.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a bridge abutment and a pier-column foundation structure 10 in this embodiment.

The bridge abutment and pier-column foundation structure 10 in the mountainous area includes an enlarged foundation 11 and an anchoring body 12 . The inside of the enlarged foundation 11 is provided with a reinforced frame, one end of the anchor 12 is anchored in the foundation pit of the mountain, and the lower surface of the enlarged foundation 11 is connected with the other end of the anchor 12.

In the above solution, an abutment and pier-column foundation structure 10 in a mountainous area is provided. The base structure includes enlarged foundations 11 and anchors 12. Compared with the existing pile foundation structure, the mountain abutment and pier foundation structure 10 provided by the above solution can be easily constructed, and the construction risk is small. At the same time, through the anchors 12, the enlarged foundation 11 can not only bear the vertical force, but also can effectively resist the horizontal force, and has good anti-overturning property. Pulling capacity to ensure the stability of the bridge. It should be noted that the construction method will be described below.

Wherein, the upper surface of the enlarged foundation 11 is provided with a platform body 20 or a pier body 30, and the platform body 20 or the pier body 30 is perpendicular to the upper surface of the enlarged foundation 11, so that the enlarged foundation 11 can better support the platform body 20 or the pier body 30 delivered loads. FIG. 2 shows the structure when the upper surface of the enlarged foundation 11 is the table body 20 (at the same time, the table cap 21 is shown), and FIG. 3 shows the structure when the upper surface of the enlarged foundation 11 is the pier body 30 .

The anchor 12 may be an anchor rod or an anchor cable. The anchor body 12 can be a prestressed structure, for example, the anchor rod or the anchor cable is made of prestressed tendons. It should be noted that the prestressed tendons have the advantages of improving the crack resistance, stiffness and impermeability of the components, and can give full play to the performance of materials and save steel.

As shown in FIG. 1 , the anchor body 12 is an anchor rod vertically arranged in the foundation pit of the mountain. At the same time, it should be noted that, during the construction of the foundation structure, a drill hole can be easily constructed by a drilling machine to place the anchor rod, and the anchor rod can be anchored by grouting the drill hole.

One end of the anchor 12 penetrates the lower surface of the enlarged foundation 11 and is embedded in the inside of the enlarged foundation 11.

In a possible implementation, the anchor body 12 is an anchor rod or an anchor cable, and an anchor rod hole or an anchor cable hole is reserved inside the enlarged foundation 11 to accommodate the anchor body 12, and the tensioning of the anchor rod or anchor cable is completed. Then, seal the anchor.

Optionally, in a possible implementation manner, the enlarged foundation 11 is a stepped (as shown in FIG. 2 ) or a conical reinforced concrete structure (as shown in FIG. 3 ). The foundation 11 evenly distributes the load transmitted by the upper platform body 20 (or the pier body 30 ).

Among them, in a possible implementation situation, as shown in FIG. 2 , the enlarged base 11 includes a top-down first part 110 and a second part 111 , the first part 110 and the second part 111 are cubes with coaxial central axes, and the first part The size of 110 is smaller than that of the second portion 111 .

It should be noted that the application also provides a kind of construction method of abutment in mountainous area and pier-column foundation, and the method includes:

The site is leveled, and the site leveling steps include: excavating the mountain to form a flat excavation surface;

Foundation excavation, the foundation excavation steps include: excavating the foundation pit according to the ground elevation of the enlarged foundation 11;

Anchor body construction, the anchor body construction steps include: installing the anchor body in the foundation pit of the mountain;

Expanding the foundation construction, the steps of expanding the foundation construction include: binding steel bars in the foundation pit, pouring concrete with vertical formwork, and curing to form the expanded foundation;

The anchor rod is tensioned, and the anchor rod tensioning step includes: tensioning the anchor body and sealing the anchor.

According to the above steps, a bridge abutment and pier-column foundation in the mountainous area are constructed.

It should be noted that, Fig. 4, Fig. 5, Fig. 6 and Fig. 7 are flowcharts of a specific construction method.

Site leveling, see FIG. 4 , the site leveling steps include: measuring and setting out, determining the excavation surface 42 according to the terrain, and excavating the mountain body with an excavator to form a flat excavation surface 42 (wherein, the excavation mountain body is shown in FIG. 4 ) 40, and its slope line 41);

The foundation excavation, referring to Fig. 5, the foundation excavation step includes: according to the ground elevation of the enlarged foundation 11, select a reasonable support and enclosure method to excavate the foundation pit (Fig. 5 shows the foundation pit 43 formed after the excavation), When the excavation surface 42 is 30cm away from the design elevation, manual excavation is used to prevent over-excavation;

Anchor rod construction, see Figure 6, the bolt construction steps include: stake out the position of the anchor rod (marked with anchor 12 in Figure 6 and Figure 7), and then use a drilling machine to drill until the drilling depth reaches the specified value (When the depth of the drilled hole 44 is greater than the length of the anchor rod by 0.5m), stop drilling. Flush the borehole 44 and install the bolt into the borehole 44 . After the bolt is installed, grouting the drilled hole 44, and pulling out the pipe while grouting;

Expanded foundation construction, see Figure 7, the expanded foundation construction steps include: lofting the expanded foundation dimension line, binding steel bars, after the steel bars are bound, pouring concrete with vertical formwork, and curing to form the expanded foundation 11, wherein the expanded foundation 11 is reserved inside Anchor rod hole (when using anchor cable, reserve anchor cable hole);

Bolt tensioning, the bolt tensioning steps include: after expanding the foundation concrete to meet the tensioning requirements, the bolts are tensioned, and the tensioning sequence is carried out according to the hole-by-hole tensioning sequence to reduce the impact on the adjacent anchors. After the tensioning is completed, seal the anchor head.

The above are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. The utility model provides a mountain area abutment and pier stud foundation structure which characterized in that includes:

expanding the foundation; and

an anchor;

the interior of the enlarged foundation is provided with a steel reinforcement framework, one end of the anchoring body is anchored in a foundation pit of a mountain body, and the lower surface of the enlarged foundation is connected with the other end of the anchoring body.

2. The mountain abutment and pier foundation structure of claim 1,

the anchoring body is an anchor rod or an anchor cable.

3. The mountain abutment and pier foundation structure of claim 2,

the anchoring body is of a prestressed structure.

4. The mountain abutment and pier foundation structure of claim 3,

one end of the anchoring body penetrates through the lower surface of the enlarged foundation and is embedded in the enlarged foundation.

5. The mountain abutment and pier foundation structure of claim 1,

the enlarged foundation is of a step-shaped or conical reinforced concrete structure.

6. The mountain abutment and pier foundation structure of claim 1,

the upper surface of the enlarged foundation is provided with a platform body or a pier body.

7. A construction method of a mountain abutment and pier stud foundation is characterized in that,

the method comprises the following steps:

and (3) constructing an anchoring body, wherein the construction steps of the anchoring body comprise: installing an anchoring body in a foundation pit of a mountain;

expanding foundation construction, wherein the expanding foundation construction step comprises the following steps: binding steel bars in the foundation pit, erecting a mold and pouring concrete, and maintaining to form an enlarged foundation; and

and (3) tensioning the anchor rod, wherein the anchor rod tensioning step comprises the following steps: and tensioning the anchoring body and sealing the anchor.

8. The method of constructing a foundation for a mountain abutment and pier stud according to claim 7,

the method further comprises the following steps:

a field leveling step and a foundation excavation step;

the field leveling step comprises: excavating a mountain body to form a flat excavated surface;

the foundation excavation step comprises: and excavating the foundation pit according to the ground elevation of the enlarged foundation.

9. The method of constructing a foundation for a mountain abutment and pier stud according to claim 8,

the foundation excavation step further comprises: and when the distance between the excavation surface and the designed elevation is 30cm, adopting manual excavation.

10. The method of constructing a foundation for a mountain abutment and pier stud according to claim 7,

the anchoring body is an anchor rod or an anchor cable;

the construction step of the enlarged foundation further comprises: and reserving an anchor rod hole or an anchor cable hole in the enlarged foundation.

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