CN211006395U - Reinforced structure of old concrete bridge - Google Patents

Abstract

The utility model discloses a reinforced structure of old bridge of concrete, reinforced structure is used for consolidating old bridge, old bridge include main muscle and cladding in the concrete of main muscle periphery, wherein: the reinforcing structure comprises a steel strand net which is composed of steel strands and fixed in an area to be reinforced and permeable polymer mortar which completely coats the steel strand net, wherein the permeable polymer mortar is bonded with the surface of the concrete. The utility model discloses the bearing capacity of bridge has been improved effectively, the cost is lower moreover, construction cycle is short.

Description

Reinforced structure of old concrete bridge

Technical Field

The utility model relates to a bridge engineering maintenance consolidates technical field, especially relates to a reinforced structure of old bridge of concrete.

Background

The concrete bridge is used as an important component of land traffic, and is widely applied due to obvious advantages, but along with the increase of the service period of the concrete bridge, the bearing capacity of the bridge is reduced due to the influence of factors such as environment, heavy-duty vehicle action and concrete deterioration on a large number of concrete bridges, so that the concrete bridge cannot meet the normal use function. Therefore, old bridges are reinforced, and the bearing capacity of the old bridges is restored and improved, so that the old bridges continue to serve modern transportation, and huge social benefits and economic benefits can be brought to the country.

The conventional reinforcement methods commonly used at present include: the method for enlarging the cross section, adhering steel plates or adhering carbon fiber cloth has long construction period, high cost, long time for closing traffic and great influence on the society and the travel of residents

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reinforced structure of old bridge of concrete has not only improved the bearing capacity of bridge effectively, and the cost is lower moreover, construction cycle is short, and need not seal the traffic.

In order to realize one of the above-mentioned utility model purposes, the utility model discloses an embodiment provides a reinforced structure of old bridge of concrete, reinforced structure is used for consolidating old bridge, old bridge include main muscle and cladding in the concrete of main muscle periphery, wherein: the reinforcing structure comprises a steel strand net which is composed of steel strands and fixed in an area to be reinforced and permeable polymer mortar which completely coats the steel strand net, wherein the permeable polymer mortar is bonded with the surface of the concrete.

As an embodiment of the utility model provides a further improvement, it has a plurality of angle steels to wait to consolidate regional anchor, steel strand wires collapse tight in the angle steel, and every the tension force of steel strand wires is not less than 50N.

As a further improvement of an embodiment of the present invention, the one end of the steel strand is used for fixing the angle steel, the other end of the steel strand is used for another angle steel is fixed and then the torque wrench is used for tightening.

As an embodiment of the present invention, the further improvement is that the fixing pins are used to fix the middle position of the steel strand net, and the interval between two adjacent fixing pins is not more than 150 mm.

As a further improvement of an embodiment of the present invention, the adhesive strength of the permeable polymer mortar is not less than 2.5 MPa.

As a further improvement of one embodiment of the present invention, the compressive strength of the permeable polymer mortar is not less than 55 MPa.

As a further improvement of one embodiment of the present invention, the flexural strength of the permeable polymer mortar is not less than 12 MPa.

The beneficial effects of the utility model are that, the utility model discloses a technical scheme, owing to adopt the steel strand wires net that steel strand wires constitute, and will the steel strand wires net is fixed in and treats the reinforcement region, and the complete cladding steel strand wires net of permeability polymer mortar and compaction in the surface of concrete. The mechanical properties of the permeable polymer mortar such as compression resistance, fracture resistance and the like have the characteristics of early strength and high strength, and the permeable polymer mortar has ultrahigh bonding strength, has the properties of permeability resistance, freezing resistance, salt resistance, alkali resistance, weak acid corrosion resistance and good durability. The permeable polymer mortar is completely bonded with the surface of old concrete after being formed, has no shrinkage and cracking resistance, and is bonded with a reinforced concrete structure into a whole to cooperatively work. And the permeable polymer mortar can be stressed cooperatively with a steel strand net formed by steel strands, so that the bearing capacity of the bridge structure is effectively improved, the cost is low, the construction period is short, and traffic does not need to be sealed. Therefore, the steel strand net and permeable polymer mortar reinforcing technology is adopted to reinforce the old bridge, so that economic waste is avoided, and the reliability of the old bridge in the service period can be ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a bottom view of an old bridge according to an embodiment of the present invention after reinforcement;

FIG. 2 is a side view of the old bridge provided in FIG. 1 after reinforcement;

FIG. 3 is an enlarged partial schematic view at A in FIG. 2;

FIG. 4 is an enlarged cross-sectional view of the old bridge provided in FIG. 1 after reinforcement;

fig. 5 is a bottom view of an old bridge according to an embodiment of the present invention before being reinforced, ground and roughened;

FIG. 6 is a side view of the old bridge provided in FIG. 5 before it has been consolidated;

FIG. 7 is an enlarged cross-sectional view of the old bridge provided in FIG. 1 before it has been consolidated;

fig. 8 is a schematic view of an old bridge provided by an embodiment of the present invention for drilling anchoring holes and embedding holes for screws in a reinforced area;

FIG. 9 is a side view of the old bridge provided in FIG. 8 drilling anchor holes and threaded rod implant holes in the reinforced area;

FIG. 10 is an enlarged partial schematic view at B of FIG. 9;

FIG. 11 is an enlarged cross-sectional view of the old bridge provided in FIG. 8 drilling anchor holes and screw-in holes in the reinforced area;

fig. 12 is a bottom view of the old bridge according to the embodiment of the present invention after the screw rods are embedded in the reinforcing area;

FIG. 13 is a side view of the old bridge provided in FIG. 12 after the screws have been implanted into the reinforcement areas;

FIG. 14 is an enlarged partial schematic view at C of FIG. 13;

FIG. 15 is an enlarged cross-sectional transverse view of the old bridge versus reinforcement area embedded screw provided in FIG. 12;

fig. 16 is a bottom view of the steel strand fixed to the reinforcing area by the old bridge according to the embodiment of the present invention;

FIG. 17 is a side view of the old bridge provided in FIG. 16 securing steel strands to a consolidation zone;

FIG. 18 is an enlarged partial schematic view at D of FIG. 17;

FIG. 19 is an enlarged cross-sectional view of the old bridge provided in FIG. 16 securing the steel strands to the consolidation area;

fig. 20 is a schematic diagram of the fixing and compressing of the permeable polymer mortar in the reinforcing area by the old bridge according to the embodiment of the present invention, where a formwork is partially installed and removed;

FIG. 21 is a side view of the old bridge provided in FIG. 20 shuttering and compressing a permeable polymer mortar;

FIG. 22 is an enlarged partial schematic view at E of FIG. 21;

fig. 23 is an enlarged cross-sectional view of the old bridge provided in fig. 20 template-fixing, compacting permeable polymer mortar in the consolidation area.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art based on these embodiments are all included in the scope of the present invention.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

Referring to fig. 1 to 4, embodiments of the present invention provide a reinforcing structure for an old concrete bridge 10. The reinforcing structure is used for reinforcing an old bridge 10, and generally, the old bridge 10 includes a main reinforcement 12 and concrete 14 coated on the outer periphery of the main reinforcement 12.

The reinforcement structure comprises a wire mesh of steel strands 16 fixed to the area to be reinforced and a permeable polymer mortar 18 completely covering the wire mesh, and the permeable polymer mortar 18 is compacted on the surface of the concrete 14 so that the permeable polymer mortar 18 is in phase with the surface of the concrete 14. Specifically, the permeable polymer mortar 18 is bonded to the concrete 14.

Specifically, a plurality of angle steels 20 are anchored in the area to be reinforced, the steel strands 16 are tightly stretched over the angle steels 20, and the tensile force of each steel strand 16 is not less than 50N.

In order to ensure the reinforcement firmness and strength, the bonding strength of the permeable polymer mortar 18 is not less than 2.5MPa, the compressive strength of the permeable polymer mortar 18 is not less than 55MPa, and the breaking strength of the permeable polymer mortar 18 is not less than 12 MPa.

The embodiment also provides a method for reinforcing the old concrete bridge, wherein the method comprises the following steps: the reinforcing method comprises the following steps:

a. referring to fig. 5 to 7, foreign matters and attachments are removed from the area to be reinforced of the old bridge to expose a new surface of the concrete 14 structure; specifically, the concrete 14 matrix in the area to be reinforced is roughened, cleaned and repaired, foreign substances and attachments are removed, and impurities such as surface laitance and oil stains are removed until the new surface of the concrete 14 structure is completely exposed. And the concrete reinforcing member with cracks is repaired firstly, and when the main reinforcement 12 of the old bridge 10 structure has a corrosion phenomenon, the main reinforcement 12 which leaks outside is subjected to rust removal and resistance treatment.

b. Referring to fig. 16 to 19, a steel strand net composed of steel strands 16 is provided and fixed to an area to be reinforced; preferably, in this step, before the steel strand net is fixed, the direction of the steel strands 16 in the reinforced area is confirmed and positioned according to the design paper requirements.

c. Referring to fig. 1 to 4, a layer of permeable polymer mortar 18 with a predetermined thickness is coated on the surface of the concrete 14 in the area to be reinforced of the old bridge, the permeable polymer mortar 18 completely covers the steel strand net, and the permeable polymer mortar 18 is compacted on the surface of the concrete 14; typically, the permeable polymer mortar 18 is applied to a thickness of approximately 0.5cm, and the permeable polymer mortar 18 needs to be prepared in advance and applied uniformly. Of course, the permeable polymer mortar 18 may be applied to other thickness values depending on the specific design.

d. Referring to fig. 20-23, a box-like form 28 is provided and a layer of release agent is applied to the interior surface of form 28, securing form 28 in a predetermined position such that permeable polymer mortar 18 is located within form 28;

e. after the permeable polymer mortar 18 is hardened, the form 28 is removed. Removal of form 28 results in the old bridge shown in figures 1 to 4 being reinforced. In addition, after removing form 28, natural curing is sufficient, typically for 1-3 days, during which time the reinforced area should be protected from hard impacts.

As shown in fig. 16 to 19, in particular, between the step a and the step b, the method further includes the steps of providing a plurality of angle steels 20, fixing the angle steels 20 at both ends of the area to be reinforced, and tensioning the steel strand net on the angle steels 20. The angle iron 20 is fixed to the concrete 14 by the bolt 22, and further referring to fig. 8 to 11, an anchoring hole 26 is drilled at a corresponding position of the concrete 14, before the anchoring hole 26 is drilled, the position of the main reinforcement 12 is ascertained so as to be staggered with the position of the main reinforcement 12, and the bolt 22 is fixed to the anchoring hole 22 so as to fix the angle iron 20 to the concrete without damaging the main reinforcement 12. Preferably, the drilling diameter of the anchoring hole 26 is 12-20 mm, and the drilling depth is 120-200 mm. In the present embodiment, the anchoring holes 26 have a drilling diameter of 20mm and a drilling depth of 160 mm. Corresponding mounting holes are drilled in the angle steel 20 corresponding to the bolts 22, thereby fixing the angle steel 20 to the concrete 14.

Furthermore, one end of each steel strand 16 is fixed by one angle steel, the other end of each steel strand 16 is fixed by another angle steel and then is tightened by a torque wrench, and the tension force of each steel strand 16 is not less than 50N.

As shown in fig. 16 to 19, the fixing pins 27 are used to fix the middle position of the steel strand net, and the setting interval between two adjacent fixing pins 27 is not more than 150 mm. Specifically, the fixing pin 27 should be fixed at the end between the auxiliary bars of the steel strand 16, and the drilling depth for inserting the fixing pin 27 is 40 mm. The fixing pins 27 ensure that the steel strand net does not hang. Specifically, in the present embodiment, the fixing pins 27 are provided in plural numbers of two or more.

As shown in fig. 12 to 15, a step of embedding the screw 29 between the step a and the step b, wherein the embedded position of the screw 29 is staggered with the position of the main rib 12, and in the step d, the template 28 is provided with a mounting hole corresponding to the screw 29, and the screw 29 passes through the mounting hole and is matched with the nut 24 to fix the template 28 (see fig. 20 to 23). With further reference to fig. 8-11, the screw embedding hole 31 is drilled before the screw 30 is embedded. The screw 29 is embedded in the screw embedding hole 31. Preferably, the diameter of the screw rod embedding hole 31 is 8-10 mm, and the depth of the drilling hole is 50-100 mm. Specifically, in the present embodiment, the drilling diameter of the screw embedding hole 31 is 8mm, and the drilling depth is 80 mm. Specifically, in the present embodiment, in order to increase the fixing stability of the formwork, two or more screws 29 are embedded, and accordingly, the number of the mounting holes is the same as that of the screws 29, and the positions of the mounting holes correspond to those of the screws 29.

In addition, before the screw 29 is embedded, the screw embedding hole 31 is cleaned, dust in the screw embedding hole 31 is blown off by clean oil-free compressed air, and then the hole wall is wiped by absorbent cotton dipped in acetone to ensure that the hole is clean. And (3) ensuring that no slurry or accumulated water exists in the screw rod embedding hole 31, and then injecting the bar planting glue into the screw rod embedding hole 31, wherein the bar planting glue injected into the screw rod embedding hole 31 needs to be injected to about 2/3 degrees of the hole depth. In addition, after the screw 29 is inserted into the bottom of the screw embedding hole 31, the whole hole is filled with the bar-planting glue, and the surplus bar-planting glue at the hole opening should be removed. And the screw 29 must not be disturbed within the curing time, i.e. before the bar-planting glue is cured. The length of the screw 29 is required to meet the design requirement, and the embedded screw 29 is stable and vertical (fig. 14 and 15). In this embodiment, the performance grade of the screw 29 is 8.8, and a full-thread non-welding screw 29 should be used.

Step c and step d need to be completed within one hour. I.e. after the application of the permeable polymer mortar 18, the formwork 28 needs to be fixed within one hour, so as to ensure the setting effect of the permeable polymer mortar 18 and the steel strand mesh.

To further ensure the setting effect of the permeable polymer mortar 18, a plurality of forms 28 are positioned in zones and the permeable polymer mortar 18 is compacted in zones to allow setting. Specifically, the plurality of formworks 28 are arranged, two adjacent formworks 28 are overlapped, and the area of the formwork 28 in the direction parallel to the surface of the concrete 14 to be reinforced is not more than 1m². Preferably, the overlapping width of two adjacent formworks 28 should be ensured to be more than 1cm, so as to ensure the setting effect of all the permeable polymer mortar 18.

Template 28 should be specifically fabricated according to the design drawing before step d, and typically, template 28 should not be oversized. The thickness of form 28 should be determined based on the design thickness of permeable polymer mortar 18; then, the pre-installation is carried out, and the drilling position of the template 28 is matched with the position of the screw 30 embedded on the site, if the drilling position is not matched, the adjustment is carried out in time. After the permeable polymer mortar 18 is applied, the steel strand mesh is completely covered by the permeable polymer mortar 18 and the screws 30 extend out of the permeable polymer mortar 18 for fixing the formwork 28

In step c, the permeable polymer mortar 18 should not be too large in one construction area, should be constructed in a staggered manner in sections, and should match the size of the formwork 28.

Further, when the permeable polymer mortar 18 is subjected to die filling, the permeable polymer mortar 18 in the die plate 28 is ensured to be thick in the middle and thin at the periphery; and after the template 28 is attached to a preset position, the template is fixed and pressed tightly by the nut 24, and after the template is fixed and pressed tightly, the template 28 is lightly knocked along the reinforcing surface by a hand hammer, and whether the permeable polymer mortar 18 is tightly bonded with the concrete 14 of the reinforced area is judged by sound, if no cavity sound exists, the permeable polymer mortar 18 is tightly bonded. If there is a void sound, indicating an uncompacted, the form 28 should be removed and a suitable amount of permeable polymer mortar 18 added at the void location and then re-secured and compressed until the permeable polymer mortar 18 and the old bridge 10 are integrated.

Due to the steel strand mesh consisting of a plurality of steel strands 16, which is fixed in the area to be reinforced, and the permeable polymer mortar 18 completely covers the steel strand mesh. The mechanical properties of the permeable polymer mortar 18 such as compression resistance, fracture resistance and the like have the characteristics of early strength and high strength, and the permeable polymer mortar has ultrahigh bonding strength, has the properties of permeability resistance, freezing resistance, salt resistance, alkali resistance, weak acid corrosion resistance and good durability. The permeable polymer mortar 18 is formed to be in complete contact with the surface of the old concrete 14, has no shrinkage and is crack resistant, and is bonded with the structure of the reinforced concrete 14 to be in integral cooperative work. And the permeable polymer mortar 18 can be stressed cooperatively with a steel strand net formed by a plurality of steel strands 16, so that the bearing capacity of the bridge structure is effectively improved, the cost is low, the construction period is short, and traffic does not need to be sealed. Therefore, the steel strand net and permeable polymer mortar 18 reinforcing technology is adopted to reinforce the old bridge, so that economic waste is avoided, and the reliability of the old bridge in the service period can be ensured.

To further ensure the setting effect of the permeable polymer mortar 18, a plurality of forms 28 are positioned in zones and the permeable polymer mortar 18 is compacted in zones to allow setting. Specifically, a plurality of templates 28 are arranged, two adjacent templates 28 are overlapped, and the area of each template 28 perpendicular to the first end portion 20 is not more than 1m². Preferably, the overlapping width of two adjacent formworks 28 should be ensured to be more than 1cm, so as to ensure the setting effect of all the permeable polymer mortar 18.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Although the description is given in terms of embodiments, not every embodiment includes only a single embodiment, and such descriptions are given for clarity only, and it will be appreciated by those skilled in the art that the description is incorporated herein as a whole, and that the embodiments may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (7)

1. A reinforced structure of old bridge of concrete, reinforced structure is used for strengthening old bridge, old bridge include the owner muscle and cladding in the concrete of owner muscle periphery, its characterized in that: the reinforcing structure comprises a steel strand net which is composed of steel strands and fixed in an area to be reinforced and permeable polymer mortar which completely coats the steel strand net, wherein the permeable polymer mortar is bonded with the surface of the concrete.

2. The reinforcing structure of the old concrete bridge according to claim 1, wherein a plurality of angle steels are anchored in the area to be reinforced, the steel strands are tightened on the angle steels, and the tensile force of each steel strand is not less than 50N.

3. The reinforcement structure for the old concrete bridge according to claim 2, wherein one end of the steel strand is fixed by the angle iron, and the other end of the steel strand is fixed by another angle iron and then tightened by a torque wrench.

4. The reinforcement structure for old concrete bridges according to claim 1, wherein the middle position of the wire mesh is fixed by fixing pins, and the interval between two adjacent fixing pins is not more than 150 mm.

5. The reinforcement structure of an old bridge of concrete according to claim 1, wherein said permeable polymer mortar has a bonding strength not less than 2.5 MPa.

6. The reinforcing structure of an old bridge of concrete according to claim 5, wherein said permeable polymer mortar has a compressive strength not less than 55 MPa.

7. The reinforcement structure of an old bridge of concrete according to claim 5, wherein the flexural strength of the permeable polymer mortar is not less than 12 MPa.

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