RU2390600C1 - Prefabricated bridge pillar - Google Patents

Abstract

FIELD: construction, road engineering.

SUBSTANCE: invention is related to bridge engineering and may be used in design and construction of bridge pillars on foundations of any design. In prefabricated bridge pillar made of blocks that consist of steel-concrete stands joined to each other, which include inner and outer metal pipes, space between which is filled with compacted inert material, preferably concrete, and ends are closed with flanges, besides inner metal pipes and holes in flange joints of stands are arranged with diametre that provides for motion of a person and required mechanisms inside the pipe; stands are combined in block by means of bolt joints via metal connections, blocks are combined to each other in process of pillar installation by flange connections of stands at high-strength bolts. At the same time block may consists of at least one steel-concrete stand. Pillar may be fixed by flange connections of lower block stands to foundation with the help of embedded part or anchor bolts, and also directly to bedrock base via anchors installed in bedrock base.

EFFECT: development of prefabricated bridge pillar having, under conditions of existing dynamic loads, in particular seismic ones, high reliability and durability with provision of its material intensity and labour costs reduction in process of pillar erection and operation.

1 cl, 9 dwg

Description

The invention relates to bridge construction and can be used in the design and construction of bridge supports on the foundations of any design.

Known prefabricated monolithic support of the bridge, containing the foundation, single and / or multi-tiered foundation part, consisting of a monolithic core and enclosing its vertical contour blocks of trapezoidal section, which have a height equal to the height of the tier of its foundation. The blocks are sealed with their lower ends in the foundation, and their upper ends are mutually joined together by connecting rods, while the lateral vertical faces of the adjacent blocks form an angle from 20 to 120 ° between each other (RU, No. 2107125 C1, E01D 19/02, 1998) .

The closest in technical essence to the analogue of the invention is a bridge support, consisting of a foundation and a spatial frame superstructure, including prefabricated inclined rack-mounted reinforced concrete elements, combined by the upper nozzle and the transverse diaphragm with the formation of the upper and lower tiers (SU, No. 1604886 A1, E01D 19 / 00, 1990).

A disadvantage of the known designs is the inconvenience and length of installation, lack of stability and reliability, especially under the influence of seismic loads.

An object of the invention is the creation of a prefabricated bridge support, which under the conditions of existing dynamic loads, in particular seismic, has high reliability and durability while ensuring a reduction in its material consumption and labor costs during the construction and operation of the support.

This problem is solved in that in the prefabricated support of the bridge, formed of blocks consisting of interconnected steel concrete pillars, which include the outer and inner metal pipes, the space between which is filled with a compacted inert material, preferably concrete, and the ends are closed with flanges, and the inner metal pipes and holes in the flange joints of the racks are made with a diameter that ensures the movement of man and the necessary mechanisms inside the pipe; the racks are combined into a block by bolted connections through metal connections, the blocks are interconnected when mounting the support with flange connections of the racks on high-strength bolts. In this case, the block may consist of at least one steel-concrete stand. The support can be fixed by flange connections of the racks of the lower block to the foundation with the help of embedded parts or anchor bolts, as well as directly to the rock base through the anchors installed in the rock base.

The invention is illustrated by drawings, where:

figure 1 shows a schematic diagram of the layout of the precast bridge;

figure 2 - construction of a four-post steel concrete block (side view);

figure 3 is the same (top view);

figure 4 is a section 1-1 in figure 2;

figure 5 - construction of steel-concrete strut block support (side view);

figure 6 is the same (top view);

Fig.7 is a section 2-2 of Fig.5;

on Fig - section 3-3 in Fig.6;

Fig.9 is a top view of a two-post construction of a steel-concrete block.

The prefabricated bridge support consists of steel-concrete blocks 1, crossbar 2 and foundation 3. The steel-concrete support block includes racks 4 of metal pipes of large diameter - inner 5 and outer 6, filling material 7, flanges for bolted joints 8, connections 9, uniting racks into a single , rigid in all directions design. The minimum difference between the radii of the outer and inner tubes of the rack (100-150 mm) is determined by the technological ability to ensure that the space between them is filled with an inert material. Blocks 1 are combined with each other when mounting the support with flange joints of racks on high-strength bolts. The support blocks may include one or more steel-concrete struts 4. The body of the support can be attached to the foundation 3 by a flange connection of the lower block strut using the embedded part or anchor bolts, as well as directly to the rock base. The support can also be performed without a crossbar and / or without a grillage.

The invention provides small dimensions of prefabricated elements of the bridge support, the convenience of their manufacture, transportation and installation, reducing the weight of the structure, reducing the construction time and labor costs when installing the support.

The invention provides full factory readiness of all elements of a prefabricated steel concrete support body, including corrosion protection.

The use of large diameter pipes in the proposed construction of the support allows the device inside the pipe of the flight of stairs, the movement of the person and the necessary mechanisms for the device of the joints of the blocks and anti-corrosion measures along the entire height of the support body.

Blocks of various heights and distances between racks allow for their small size range to ensure the selection of the height of any support.

Filling the space between the external and internal pipes with an inert material, preferably concrete, ensures the stability of the pipe walls without setting additional stiffeners, giving the structure general and local stability as a whole. In addition, concrete perceives vertical loads from spans and vehicles.

The low self-weight of the supports and the possibility of creating a design of a different in value of the tightening torque of the bolts of the flange connections increases the seismic resistance and reduce the loads on the foundation.

The complete assembly of support structures with joints on high-strength bolts ensures their repeated use for the construction of collapsible bridges on highway roads as bridge-building equipment.

The technical and economic efficiency of the use of bridge supports from prefabricated steel concrete blocks increases significantly at a height of more than 15 meters up to 50-80 meters.

Claims (1)

A prefabricated bridge support formed of blocks consisting of steel-concrete struts joined together, while the steel-concrete struts include external and internal metal pipes, the space between which is filled with a compacted inert material, preferably concrete, and the ends are closed by flanges, and the internal metal pipes and openings flange joints of racks are made with a diameter that ensures the movement of a person and the necessary mechanisms inside the pipe; the racks are combined into a block by bolted connections through metal connections, the blocks are interconnected when mounting the support with flange connections of the racks on high-strength bolts.

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