CN212896440U - Semi-prefabricated cable terminal platform foundation in soil filling area - Google Patents

Abstract

The utility model relates to a cable terminal platform foundation at the side of a transmission line tower, in particular to a semi-prefabricated cable terminal platform foundation in a soil-filling area, which is structurally characterized by also comprising a prefabricated reinforced concrete pipe, wherein the prefabricated reinforced concrete pipe comprises a concrete circular pipe, annular hot-dip galvanized flat steel, an inner anchor rod and a peripheral anchor rod; wherein a plurality of annular hot-dip galvanized flat steels are embedded on the inner side surface of the concrete circular tube and are distributed in parallel from top to bottom; a plurality of peripheral anchor rods embedded in the concrete circular tube are welded and fixed on the outer side surface of the annular hot-dip galvanized flat steel, and a plurality of inner anchor rods are welded on the inner side surface at intervals; the prefabricated reinforced concrete pipe is located in the foundation pit, foundation bolts on the bottom end of the platform stand column are connected with the inner side anchor rods in a welded mode through steel members, and the prefabricated reinforced concrete pipe and the foundation pit are poured into a whole through a cast-in-place concrete body. Cable termination platform foundation structure construction convenience, do not influence the iron tower basis, can ensure construction period and construction safety nature.

Description

Semi-prefabricated cable terminal platform foundation in soil filling area

Technical Field

The utility model relates to a transmission line shaft tower limit cable terminal platform basis, especially a fill out half prefabricated cable terminal platform basis in soil area.

Background

Most of the cable terminal platforms are located below the overhead line and are close to the iron tower foundation. The cable terminal platform foundation in the filling area is of a full cast-in-place reinforced concrete structure, a foundation template is installed after a foundation pit is excavated, then a reinforcement cage is welded according to the site template, and finally integral concrete casting is carried out. Wherein the excavation of foundation ditch generally adopts the excavation of putting the slope or row's stake is strutted and is excavated, however the weak point of above-mentioned technique lies in:

1) because the soil quality of the filled area is loose, the self-stability of the soil body is poor, the slope of the terminal platform foundation construction slope excavation is slow, the excavation range is large, and the terminal platform foundation is close to the iron tower, a large amount of covering soil on the iron tower foundation is stripped. Particularly, the iron tower plate type foundation needs to resist the upward pulling force of the iron tower in the tilting process through the upper part earthing of the foundation, so that the iron tower has the potential overturning hazard due to the fact that the upper part earthing of the plate type foundation is largely stripped. In order to solve the problem, the iron tower needs to be prevented from overturning in the process of foundation pit excavation by installing the temporary stay wire, however, the temporary stay wire of the iron tower needs to be installed in a power failure mode, the power failure application procedure is complex, the construction period is delayed, the social influence is great, and in addition, the additional load caused by the temporary stay wire can cause the damage of part of rod pieces of the iron tower.

2) If the terminal platform foundation is excavated by steel sheet pile support, the mechanical property of the soil body in the soil filling area is poor, and the steel sheet pile needs a larger embedding depth, so that the whole steel sheet pile is longer. However, the terminal platform foundation is usually located right below the overhead line, the lifting height of the steel sheet pile is high, the electrified safety distance of the construction machinery is easy to be insufficient, and the high-voltage line discharge is caused to cause casualties. Meanwhile, in the early construction period, part of the length of the steel sheet piles are required to be mechanically driven into the soil body below the foundation, and after the foundation is basically constructed, all the steel sheet piles are required to be pulled out, so that the steel tower foundation is greatly disturbed and extruded in the pulling and pulling process.

Disclosure of Invention

An object of the utility model is to provide a do not influence iron tower basis, construction convenience, guarantee time limit for a project, the half prefabricated cable terminal platform basis in the filled area that the security is good according to prior art's weak point.

The purpose of the utility model is realized through the following ways:

the semi-prefabricated cable terminal platform foundation in the soil filling area comprises a foundation pit and a cast-in-place concrete body and is structurally characterized by also comprising a prefabricated reinforced concrete pipe, wherein the prefabricated reinforced concrete pipe comprises a concrete circular pipe, annular hot-dip galvanized flat steel, an inner anchor rod and a peripheral anchor rod; the height of the concrete circular pipe is consistent with the depth of a foundation pit, the cross section of the concrete circular pipe is of a circular structure, a plurality of annular hot-dip galvanized flat steels are distributed on the inner side surface of the concrete circular pipe in parallel from top to bottom, the plurality of annular hot-dip galvanized flat steels are embedded on the inner side surface of the concrete circular pipe, a plurality of peripheral anchor rods are fixedly welded on the outer side surface of each annular hot-dip galvanized flat steel, each peripheral anchor rod is embedded in the concrete circular pipe, and a plurality of inner anchor rods are welded on the inner side surface of each annular hot-dip galvanized flat steel at; the prefabricated reinforced concrete pipe is located in the foundation pit, foundation bolts on the bottom end of the platform stand column are connected with the inner side anchor rods in a welded mode through steel members, and the prefabricated reinforced concrete pipe and the foundation pit are poured into a whole through a cast-in-place concrete body.

The prefabricated reinforced concrete pipe is hoisted in advance to be vertically placed at the position of a foundation pit without excavating the foundation pit in advance during construction, then a soil body is manually excavated in the range surrounded by the prefabricated reinforced concrete pipe, and the prefabricated reinforced concrete pipe is sunk while excavating until the required depth of the foundation pit is completed. In the process, the prefabricated reinforced concrete pipe is used as a retaining wall in the excavation process of the terminal platform foundation, after the excavation is finished, the prefabricated reinforced concrete pipe is used as a template for pouring the terminal platform foundation concrete, is integrated with cast-in-place concrete through an inner side anchor rod, and becomes a main stress component for bearing horizontal bending moment and axial tension in the platform foundation. Therefore, the cable terminal platform foundation of the utility model does not need slope-putting excavation or steel sheet pile supporting excavation, the height of the prefabricated reinforced concrete pipe is consistent with the excavation depth of the foundation pit, the soil body does not need to be additionally embedded, the lifting height can ensure enough safety distance, and the dead weight can be used as a retaining wall for excavation in a soil filling area in construction; this prefabricated reinforced concrete pipe need not to set up the template in addition, can pour into an organic whole with the foundation ditch, realizes quick shaping. Consequently cable termination platform foundation structure construction convenience, do not influence the iron tower basis, can ensure construction period and construction safety nature.

The utility model discloses can further specifically do:

the lower end part of the concrete circular pipe is of a variable cross-section step structure, and the cross-section diameter of the bottom end part is larger than that of the upper pipe body.

Therefore, a step structure is formed on the outer side wall of the lower end part of the concrete circular pipe, the step structure can reduce the sinking friction resistance of the prefabricated reinforced concrete pipe, and the prefabricated reinforced concrete pipe and the foundation pit are poured into a whole to improve the uplift bearing capacity of the foundation. In addition, in the construction process, when the prefabricated reinforced concrete pipe is difficult to sink, sand can be poured on the step structure to aid sinking by means of the side wall variable cross-section structure.

The inner anchor rods and the outer anchor rods are located on the same diameter ray of the concrete circular tube.

Namely, the ring-shaped hot-dip galvanized flat steel is taken as the symmetrical center and is positioned at the two sides of the flat steel.

To sum up, the utility model provides a fill out half prefabricated cable terminal platform basis in soil area has adopted prefabricated reinforced concrete pipe, utilizes its dead weight as the dado in the work progress to utilize its prefabricated construction and foundation ditch to pour integrative coordinated atress, become the main atress component that bears horizontal bending moment and axle pulling force in the platform basis, cable terminal platform foundation structure construction convenience, do not influence the iron tower basis, can ensure construction period and construction safety nature.

Drawings

Fig. 1 is the utility model discloses a fill out half prefabricated cable terminal platform basic structure schematic diagram in soil area.

FIG. 2 is a schematic structural view of the prefabricated reinforced concrete pipe of the present invention;

fig. 3 is a schematic cross-sectional structure of fig. 2.

The present invention will be further described with reference to the following examples.

Detailed Description

The best embodiment is as follows:

referring to the attached drawings 1-3, the semi-prefabricated cable terminal platform foundation in the soil filling area comprises a foundation pit 1, a cast-in-place concrete body 2 and a prefabricated reinforced concrete pipe, wherein the prefabricated reinforced concrete pipe comprises a concrete circular pipe 3, annular hot-dip galvanized flat steel 4, an inner anchor rod 5 and a peripheral anchor rod 6. The height of the concrete circular pipe 3 is consistent with the depth of the foundation pit 1, the cross section of the concrete circular pipe is of a circular structure, the lower end part of the concrete circular pipe is of a variable cross section step structure 7, and the diameter of the cross section of the bottom end part of the concrete circular pipe is larger than that of the cross section of the pipe body of the upper part of the concrete circular pipe. The inner side surface of the concrete circular tube 3 is provided with a plurality of annular hot-dip galvanized flat steels 4 in parallel from top to bottom, the plurality of annular hot-dip galvanized flat steels 4 are embedded on the inner side surface of the concrete circular tube 3, the outer side surface of each annular hot-dip galvanized flat steel 4 is fixedly welded with a plurality of peripheral anchor rods 6, each peripheral anchor rod 6 is embedded in the concrete circular tube 3, and a plurality of inner side anchor rods 5 are welded on the inner side surface of each annular hot-dip galvanized flat steel 2 at intervals. The prefabricated reinforced concrete pipe is located basic foundation ditch, and its central axis is foundation ditch central axis, and rag bolt 8 on the platform stand bottom passes through steel member and 5 welded connection of inboard stock, and prefabricated reinforced concrete pipe pours an organic whole through inboard stock 5 and cast-in-place concrete body at basic foundation ditch.

The utility model discloses a main points still lie in:

1) through pre-burying a plurality of shear connectors (annular hot dip galvanized flat steel, inboard stock and periphery stock) that the ring type was arranged at concrete circular tube inboard, realize that prefabricated reinforced concrete pipe and the concrete that its inboard later stage was pour atress in coordination, replace traditional processing steel reinforcement cage as the basic main atress component of terminal platform, bear horizontal bending moment and axial tension.

2) The prefabricated reinforced concrete pipe realizes factory prefabrication processing, effectively reduces the labor intensity of workers and improves the working efficiency.

3) The prefabricated reinforced concrete pipe is used as a protective wall in the excavation process of the terminal platform foundation, and meanwhile, the prefabricated reinforced concrete pipe is used as a template for pouring the terminal platform foundation. The construction on this structure basis can effectively avoid filling out the foundation construction of area terminal platform and excavate on a large scale, moreover because prefabricated reinforced concrete pipe length is unanimous with terminal platform foundation excavation depth, whole length is shorter, consequently need not additionally to imbed the soil body, need not tall and big machinery and hoist and mount and can satisfy electrified construction safe distance. The prefabricated reinforced concrete pipe is not only a template but also a part of the foundation, so that the terminal platform foundation can be poured without additionally erecting the template to realize rapid forming.

The part of the utility model which is not described is the same as the prior art.

Claims (3)

1. The semi-prefabricated cable terminal platform foundation in the soil filling area comprises a foundation pit and a cast-in-place concrete body and is characterized by also comprising a prefabricated reinforced concrete pipe, wherein the prefabricated reinforced concrete pipe comprises a concrete circular pipe, annular hot-dip galvanized flat steel, an inner anchor rod and a peripheral anchor rod; the height of the concrete circular pipe is consistent with the depth of a foundation pit, the cross section of the concrete circular pipe is of a circular structure, a plurality of annular hot-dip galvanized flat steels are distributed on the inner side surface of the concrete circular pipe in parallel from top to bottom, the plurality of annular hot-dip galvanized flat steels are embedded on the inner side surface of the concrete circular pipe, a plurality of peripheral anchor rods are fixedly welded on the outer side surface of each annular hot-dip galvanized flat steel, each peripheral anchor rod is embedded in the concrete circular pipe, and a plurality of inner anchor rods are welded on the inner side surface of each annular hot-dip galvanized flat steel at; the prefabricated reinforced concrete pipe is located in the foundation pit, foundation bolts on the bottom end of the platform stand column are connected with the inner side anchor rods in a welded mode through steel members, and the prefabricated reinforced concrete pipe and the foundation pit are poured into a whole through a cast-in-place concrete body.

2. The earthen fill area semi-prefabricated cable termination platform foundation of claim 1, wherein said concrete circular tube has a variable cross-section stepped configuration at a lower end portion thereof having a cross-sectional diameter greater than a cross-sectional diameter of an upper tube body thereof.

3. The semi-prefabricated cable termination platform foundation in a filled area of claim 1, wherein said inner anchor rods and said outer perimeter anchor rods are located on the same diameter line of a circular pipe of concrete.

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