RU160344U1 - REINFORCED REINFORCED REINFORCED CONCRETE FACING - Google Patents

Abstract

The reinforced concrete parapet fence with prestressing, including the parapet block and the strands stretched in the straight channels of the parapet block, while the strands are fixed on the end sides of the parapet block with anchor fastening and are made with the possibility of prestressing the parapet block, characterized in that the parapet block additionally has reinforcing bars outlets in its lower part, which are fixed in the beam of the bridge.

Description

The proposed utility model relates to bridge construction, namely, to the details of bridges and can be used in the device of parapet fencing.

Known SU patent for the invention No. 1451203, IPC E01D 19/10 "Fencing of the carriageway of the bridge" The invention relates to bridge construction and can be used in bridges and other transport structures as enclosing structures. The purpose of the invention. - increase the holding ability of the fence. The fencing of the carriageway of the bridge includes corner parapet blocks laid on both sides of the carriageway on the bridge span, strands combining opposite blocks and located under the carriageway at an angle of 30-60 in the plan to the axis of the bridge, with adjacent strands tilted in opposite directions.

The disadvantage of this technical solution is that with the proposed increase in the holding ability of the fence, the fence is protected from falling, but not sufficiently protected from tearing.

Known patent for invention GB 1031111 (A). "Strengthening the ties of fencing blocks in their structure." Including the parapet block and the strands stretched in the rectilinear channels of the parapet block, while the strands are fixed on the end sides of the parapet block by anchor fastening and are made possible to prestress the parapet block.

The objective of the proposed utility model is to maximize the holding capacity of the parapet fence with the provision of reinforcing the bearing capacity of the bridge.

The problem is solved due to the fact that the reinforced concrete parapet fence with prestressing includes a parapet block and strands stretched in the rectilinear channels of the parapet block. The strands are made with the possibility of prestressing the parapet block and are fixed on the end sides of the parapet block with anchor fastening. The parapet block additionally has reinforcing outlets in its lower part, which are fixed in the beam of the bridge.

The essence of the utility model is illustrated by drawings:

FIG. 1. - General view of reinforced concrete parapet fencing with prestressing.

FIG. 2. - Type of installed, stretched and fixed strands in the body of reinforced concrete parapet fencing with prestressing.

FIG. 3. - Front view of a reinforced concrete parapet fence with prestress installed on the bridge beam.

According to statistics, about 30% of all accidents occur as a result of an unexpected exit of vehicles outside the roadway with subsequent rollover or collision with an obstacle.

One of the most effective security measures is the installation of road fences (parapets). The proposed reinforced concrete parapet fence with prestressing is designed for power impact of vehicles. The design of reinforced concrete parapet fencing with prestressing is due to the requirements of holding vehicles on the roadway, dividing strip or roadside with permissible impact of inertial forces on drivers and passengers.

The proposed reinforced concrete parapet fence with prestressing has a complex configuration of the side surface with inclined side faces.

Particularly effective is the installation of the proposed fencing on bridges and overpasses.

Reinforced concrete parapet fence 1 with prestressing includes a parapet block 2 and strands 3, stretched in the straight channels 4 of the parapet block. The strands 3 are made with the possibility of prestressing the parapet block 2 and are fixed on the end sides 5 of the parapet block 2 with an anchor 6. The parapet block additionally has reinforcement outlets 7 in its lower part, which are tightly fixed in the beam of the bridge 8. (see Fig. 1 , 2, 3)

The design of reinforced concrete parapet fencing with prestressing, effectively prevents the exit of vehicles from the bridge (overpass) and works as follows:

1. Due to the concave inclined shape of the inner side and the protrusion in the lower part, the parapet guard 1 contributes to effective braking and prevents the strong negative consequences of the collision for the driver and passengers.

2. Due to the prestressing reinforced concrete parapet fence 1 is insured against cracks and tears.

3. Due to the proposed reinforcement of reinforced concrete parapet fencing 1 by prestressing, the fence enters into joint work with the bridge span. Due to this, there is an increase in the bearing capacity of the bridge. The prestressed parapet fence 1 enhances resistance to the bends of the bridge and helps to regulate the voltage of the bridge beams. 7

The advantages of the proposed reinforced concrete parapet fence with prestress is as follows:

1. Resistance to cracking.

2. Tear resistance.

3. Vehicle retention efficiency.

4. Security.

5. Strengthening the bearing capacity of the bridge.

There are two options for the manufacture and installation of reinforced concrete parapet fencing with prestressing:

1. Blocks 2 of reinforced concrete parapet fencing are prefabricated with longitudinal holes (rectilinear channels) 4 along the whole body of blocks 2 and with reinforcement outlets in the lower part of blocks 2.

Then these outlets are installed in pre-drilled holes in the beam of the bridge 7.

After that, the outlets are fixed in the holes.

Then in the longitudinal holes (rectilinear channels) 4, the strands 3 are installed (reinforcement beams), they are pulled with a jack and the clip is fixed on the tension side (end sides) 5.

2. On the designated for the parapet place of the beam of the bridge 7 establish the formwork. In the beam of the bridge 7 drill holes for the reinforcing cage.

Then the fittings are installed and the outlets are left, which are installed in the holes drilled in the bridge beam 7.

After that, pipes are installed in the installed reinforcement (to create straight channels 4) for strands 3 of the prestress. Pipes are laid along block 2 of the parapet. Next, the entire structure is poured with concrete.

After the concrete sets, pre-tension is carried out, strands 3 are pulled into the pipes, pulled with a jack and the clip is fixed on the tension side (end side 5).

Pre-stressed reinforced concrete parapet fencing blocks are manufactured in relation to the parapet fencing design provided for by the project documentation of the facility using block sizes according to the developed specifications.

Depending on the installation location (road, bridge construction) and traffic conditions (group of road conditions) reinforced concrete parapet fences with prestressing are of different heights.

The values of the characteristics of the fencing for installation in various operating conditions meet the retention capacity and safety requirements of paragraphs. 6.2-6.5 GOST 52607.

For the manufacture of reinforced concrete parapet fencing blocks with prestressing, heavy concrete is used that meets the requirements for concrete for road and airfield coatings GOST 26633, GOST 10060.

Blocks are made of concrete with a compressive strength class of at least B35 according to GOST 26633.

Concrete grade for frost resistance not lower than F300 according to the second basic method according to GOST 10060.0 when tested according to GOST 10060.2 for both concrete road and airfield coatings. Blocks are made of concrete of especially low permeability (SNiP 2.03.11) with a concrete brand for water resistance not lower than W8. Water resistance of concrete complies with GOST 12730.5

When installing blocks of reinforced concrete parapet fencing with prestressing, one should be guided by the requirements of GOST R 52289 in terms of their position relative to the edge of the carriageway, the edge of the subgrade and the edge of the span. Work on the installation of fences should be performed after the completion of the planning and strengthening of roadsides and slopes of the subgrade, the installation of dust berm, spans and transition plates of bridge structures.

The blocks are installed using a crane using mounting loops that are screwed into the blocks during installation. After installation, the loops are unscrewed and the holes in the block are closed with plugs.

The blocks are mounted by lowering each subsequent block from top to bottom and ensuring the connection of the blocks by engaging the coupling device.

The blocks are installed in the permanent fence of the road group with their deepening in the roadbed.

Reinforcement tensioning methods:

- Mechanical method - tension, usually using hydraulic or screw jacks

- Electrothermal tension method - tension using an electric current to heat up the reinforcement, in which the reinforcement is extended to certain values - Electrothermomechanical - a method that combines mechanical and electrothermal.

All of the above speaks of the fulfillment of the technical task, namely: the maximum reinforcement of the holding ability of the parapets with the provision of strengthening the bearing capacity of the bridge.

The list of positions:

1. Parapet fencing

2. Parapet block

3. Strands

4. Rectilinear channel

5. End side

6. Anchor

7. The beam of the bridge

Claims (1)

The reinforced concrete parapet fence with prestressing, including the parapet block and the strands stretched in the straight channels of the parapet block, while the strands are fixed on the end sides of the parapet block with anchor fastening and are made with the possibility of prestressing the parapet block, characterized in that the parapet block additionally has reinforcing bars outlets in its lower part, which are fixed in the beam of the bridge.

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