CN217556728U - An embedded structure for strengthening and widening medium and small span bridges and culverts - Google Patents

Abstract

The utility model relates to an embedded structure for reinforcing and widening bridges and culverts with medium and small spans, comprising: an original structure, corrugated steel in a reinforcing section, corrugated steel in a connecting section, a concrete filling layer, a geogrid, and backfill soil in the connecting section , Backfill soil in reinforcement section, corrugated steel foundation in reinforcement section, corrugated steel foundation in extension section, planting bars between corrugated steel foundation and original structure, angle steel in reinforcement section, angle steel in extension section, anchor bolt in reinforcement section, ground in extension section foot bolts. The utility model solves the problem of differential settlement of the roadbed of the connecting long section and the reinforcing section by optimizing the reinforcing structure and using the geogrid reinforcing technology to reduce the load of the connecting long section. By adding a geogrid above the corrugated steel in the extension section, the load of the corrugated steel in the extension section is transferred to the reinforcement section, and the smoothness of the road surface is enhanced. The relative sliding between the corrugated steel in the reinforcement section and the concrete filling layer can be reduced by backfilling the long section of backfill soil in layers, and then pouring the concrete filling layer in the reinforcement section.

Description

An embedded structure for strengthening and widening medium and small span bridges and culverts

technical field

The utility model belongs to the technical field of bridge engineering, in particular to an embedded structure for reinforcing and widening medium and small span bridges and culverts.

Background technique

In recent years, the transportation pressure of highways has increased, and the original highways urgently need to be reconstructed and expanded to meet the rapidly increasing transportation demand. Under the long-term impact of vehicle loads and the uneven settlement of the foundation, many reinforced concrete structures have cracks, water leakage, block drop and other diseases. Therefore, the original bridges and culverts need to be reinforced when the expressway is expanded.

The corrugated steel lining reinforcement structure is to line the corrugated pipes (plates) in the existing round pipe culverts, box culverts, arch culverts, cover plate culverts, beam bridges, and arch bridges, and fill concrete between the lining material and the original structure. and other micro-expandable materials. Corrugated steel lining can be extended to both sides for widening of existing roads. The corrugated steel lining reinforcement method utilizes the foundation of the original structure, does not require a large area of planting bars and chisels, is convenient for construction, and does not interrupt traffic, and the increase in bearing capacity can be adjusted according to the thickness and strength of the filler. Considering that the use of corrugated steel to reinforce and lengthen bridges and culverts with medium and small spans, the stiffness of the reinforcement section and the extension section are different and the uneven settlement of the foundation will often cause cracks in the pavement. To balance the stiffness by pouring light weight, this method is complicated to construct, and is not economical and environmentally friendly.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art, and to provide a kind of embedded structure that utilizes corrugated steel to reinforce and widen bridges and culverts with medium and small spans. At the same time, the problem of differential settlement of the subgrade in the extension section and the reinforcement section is solved.

An embedded structure for reinforcing and widening small and medium-span bridges and culverts, comprising: original structure, corrugated steel in reinforcement section, corrugated steel in extension section, concrete filling layer, geogrid, backfill part in extension section, reinforcement section The backfill part, the corrugated steel foundation part of the reinforcement section, the corrugated steel foundation part of the extension section, the planting bars between the corrugated steel foundation part and the original structure, the reinforcement section angle steel, the extension section angle steel, the reinforcement section anchor bolts and the extension section anchor bolts;

The corrugated steel in the reinforcement section and the corrugated steel in the extension section have the same cross section, the concrete filling layer is located between the corrugated steel in the reinforcement section and the original structure, the geogrid is located in the backfill part of the extension section, the corrugated steel foundation part of the reinforcement section and the extension section The inner surface of the corrugated steel foundation part of the section is in the same plane, and the top surfaces of the two are in the same plane. The corrugated steel foundation part of the reinforcement section and the corrugated steel foundation part of the reinforcement section are pre-buried through the anchor bolts of the reinforcement section of the corrugated steel foundation part of the reinforcement section. It is connected with the angle steel of the reinforcement section, the corrugated steel of the extension section and the corrugated steel base part of the extension section are connected by the anchor bolts of the extension section embedded in the base part of the corrugated steel of the extension section and the angle steel of the extension section; the corrugated steel foundation part of the reinforcement section is connected. It is connected with the foundation part or side wall of the original structure through the planting reinforcement between the corrugated steel foundation part and the original structure; the backfill part of the extension section and the backfill part of the reinforcement section are located above the original structure and the corrugated steel section of the extension section respectively; The contact surface between the backfill part of the segment and the backfill part of the reinforcement segment is a complementary sawtooth shape.

Further, the corrugated steel in the reinforcement section and the corrugated steel in the extension section are arch or box-shaped corrugated steel structures composed of corrugated steel plates.

Further, the planting bars between the corrugated steel foundation part and the original structure are ordinary steel bars or bolt-type anchor bars.

Further, the reinforcing section angle steel and the lengthening section angle steel are equilateral or unequal angle steels with two rows of circular holes on the side and one row of circular holes on the bottom.

Further, the anchor bolts of the reinforcement section and the anchor bolts of the extension section are L-shaped steel rods with wires.

The beneficial effects of the present utility model:

The utility model solves the problem of differential settlement of the roadbed of the connecting long section and the reinforcing section by optimizing the reinforcing structure and utilizing the geogrid reinforcing technology to reduce the load of the connecting long section. By adding a geogrid above the corrugated steel in the extension section, the load of the corrugated steel in the extension section is transferred to the reinforcement section, and the smoothness of the road surface is enhanced. The relative sliding between the corrugated steel in the reinforcement section and the concrete filling layer can be reduced by firstly backfilling the long section of backfill soil in layers, and then pouring the concrete filling layer in the reinforcement section.

Description of drawings

Figure 1 is an elevation view of the embedded structure for reinforcing and widening small and medium-span bridges and culverts.

Figure 2 is a cross-sectional view of the long section of the embedded structure for strengthening and widening small and medium-span bridges and culverts.

Figure 3 is a cross-sectional view of the embedded structural reinforcement section for strengthening and widening small and medium-span bridges and culverts.

Fig. 4 is a side view of the connection position of the arch foot of the reinforcement section and the extension section.

Reference signs: original structure 1, corrugated steel in the reinforcement section 2, corrugated steel in the extension section 3, concrete filling layer 4, geogrid 5, backfill soil 6 in the extension section, backfill soil in the reinforcement section 7, corrugated steel in the reinforcement section Foundation 8, long corrugated steel foundation 9, planting bars 10 between the corrugated steel foundation and the original structure, reinforced section angle steel 11, extended section angle steel 12, reinforced section anchor bolts 13, and extended section anchor bolts 14.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the following describes in detail an embedded structure for reinforcing and widening small and medium-span bridges and culverts provided by the present invention with reference to the embodiments. The following examples are only used to illustrate the present invention and not to limit the scope of the present invention.

The utility model proposes an embedded structure in order to solve the pavement cracking caused by the difference in stiffness of the reinforcement section and the extension section and the uneven settlement of the foundation when corrugated steel is reinforced and long-medium and small-span bridges and culverts are connected. At the same time, the problem of differential settlement of the subgrade in the extension section and the reinforcement section is solved.

Example 1

An embedded structure for reinforcing and widening small and medium-span bridges and culverts, comprising: original structure 1, corrugated steel in reinforcement section 2, corrugated steel in extension section 3, concrete filling layer 4, geogrid 5, extension section Section backfill 6, reinforcement section backfill 7, reinforcement section corrugated steel foundation 8, extension section corrugated steel foundation 9, planting bar between corrugated steel foundation and the original structure 10, reinforcement section angle steel 11, extension section angle steel 12, The anchor bolts 13 of the reinforcement section and the anchor bolts 14 of the extension section are provided.

The original structure 1 is a small and medium-span bridge or culvert to be reinforced and expanded. The corrugated steel 2 of the reinforcement section and the corrugated steel 3 of the extension section are arch-shaped and box-shaped corrugated steel structures composed of corrugated steel plates. The concrete filling layer 4 is micro-expanded concrete. The planting bars 10 between the corrugated steel foundation and the original structure are ordinary steel bars or bolt-type anchor bars. The reinforced section angle steel 11 and the extension section angle steel 12 are equilateral or unequal-sided angles with two rows of round holes on the side and one row of round holes on the bottom. The anchor bolts 13 of the reinforcement section and the anchor bolts of the extension section are L-shaped steel rods with wire sleeves.

Remove the curb stone and wing wall of the old road, remove the peeled part, and excavate and replace the inner soil with a thickness of about 0.3m on the slope surface where the old road and the new road are spliced. Steps are then dug up from the foot of the widened side. Chisel the interface between the original structure and the corrugated steel foundation of the reinforcement section, plant reinforcement on the chiseled surface, bind the reinforcement section and the pre-buried anchor bolts of the corrugated steel foundation of the reinforcement section and the corrugated steel foundation of the extension section, and attach the reinforcement section to the corrugated steel foundation. The reinforcement in the corrugated steel foundation is welded to the implanted reinforcement. Settlement joints should be set between the corrugated steel foundation of the reinforcement section and the corrugated steel foundation of the extension section. The surface of the original structure is cleaned, the cracks of the original structure are filled with grouting by the grouting method, and epoxy grout is applied on the surface. Install the corrugated steel foundation of the reinforcement section and the formwork of the corrugated steel foundation of the extension section, and pour it. After the foundation is poured, corrugated steel is installed in pieces, and baffles are installed at the junction of the reinforcement section and the extension section. After that, the soil above the long corrugated steel is backfilled in layers, and the geogrid is laid when the design elevation of the geogrid is reached, and the layered backfill is continued. After backfilling to the design elevation, micro-expansion concrete is filled between the corrugated steel in the reinforcement section and the original structure, and finally the pavement layer is applied.

The examples of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned examples, and can also be made without departing from the purpose of the present utility model within the scope of knowledge possessed by those of ordinary skill in the art. Various changes of the present invention should also be regarded as the protection scope of the present invention.

Claims (5)

1. an embedded structure of reinforcing and widening medium and small span bridges and culverts, is characterized in that, comprising: original structure, reinforcing section corrugated steel, connecting length corrugated steel, concrete filling layer, geogrid, connecting length The backfill part, the backfill part of the reinforcement section, the corrugated steel foundation part of the reinforcement section, the corrugated steel foundation part of the extension section, the planting bars between the corrugated steel foundation part and the original structure, the reinforcement section angle steel, the extension section angle steel, the reinforcement section ground Anchor bolts and extension anchor bolts; The corrugated steel in the reinforcement section and the corrugated steel in the extension section have the same cross section, the concrete filling layer is located between the corrugated steel in the reinforcement section and the original structure, the geogrid is located in the backfill part of the extension section, the corrugated steel foundation part of the reinforcement section and the extension section The inner surface of the corrugated steel foundation part of the section is in the same plane, and the top surfaces of the two are in the same plane. The corrugated steel foundation part of the reinforcement section and the corrugated steel foundation part of the reinforcement section are pre-buried through the anchor bolts of the reinforcement section of the corrugated steel foundation part of the reinforcement section. It is connected with the angle steel of the reinforcement section, the corrugated steel of the extension section and the corrugated steel base part of the extension section are connected by the anchor bolts of the extension section embedded in the base part of the corrugated steel of the extension section and the angle steel of the extension section; the corrugated steel foundation part of the reinforcement section is connected. It is connected with the foundation part or side wall of the original structure through the planting reinforcement between the corrugated steel foundation part and the original structure; the backfill part of the extension section and the backfill part of the reinforcement section are located above the original structure and the corrugated steel section of the extension section respectively; The contact surface between the backfill part of the segment and the backfill part of the reinforcement segment is a complementary sawtooth shape. 2. The embedded structure of reinforcing and widening medium and small span bridges and culverts according to claim 1, wherein the corrugated steel in the reinforcing section and the corrugated steel in the connecting section are arches or boxes made of corrugated steel plates Corrugated steel structure. 3. the embedded structure of reinforcing and widening medium and small span bridges and culverts according to claim 1, is characterized in that, the planting bar between described corrugated steel foundation part and original structure is common steel bar or bolt type anchor bar . 4. the embedded structure of reinforcing and widening small and medium-span bridges and culverts according to claim 1, it is characterized in that, described reinforcement section angle steel and extension section angle steel are two rows of circular holes opened on the side, and one row is opened on the bottom surface Equal or unequal angle for round holes. 5 . The embedded structure for reinforcing and widening small and medium-span bridges and culverts according to claim 1 , wherein the anchor bolts in the reinforcement section and the anchor bolts in the extension section are L-shaped steel rods with wire sleeves. 6 .

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