CN111663460A - Construction method for repairing defects of bridge pad stone - Google Patents
Construction method for repairing defects of bridge pad stone Download PDFInfo
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- CN111663460A CN111663460A CN202010597359.7A CN202010597359A CN111663460A CN 111663460 A CN111663460 A CN 111663460A CN 202010597359 A CN202010597359 A CN 202010597359A CN 111663460 A CN111663460 A CN 111663460A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a construction method for repairing defects of a bridge pad stone, which comprises a capping beam, a defect pad stone, a support and a main beam, wherein the defect pad stone is arranged at the top of the capping beam, the support is arranged at the top of the defect pad stone, and the top of the support is abutted against the bottom of the main beam; the construction method specifically comprises the following construction steps: the method comprises the steps of setting a temporary support, chiseling a defect part of a defect cushion stone, drilling a bar planting hole, planting bars, encapsulating the cushion stone, injecting high-strength non-shrinkage slurry and maintaining, and finally removing the temporary support to finish repair construction. The construction method for repairing the defects of the bridge padstone can finish the whole repairing process without jacking the main beam and dismantling the support system. The construction process is simplified, and other adverse factors influencing the bridge structure caused by jacking the main beam and dismantling the support system are avoided. Moreover, the method for repairing the pad stone is simple and convenient in construction method, good in safety coefficient and reliable in repairing effect.
Description
Technical Field
The invention relates to the technical field of bridge engineering construction, in particular to a construction method for repairing defects of a bridge pad stone.
Background
The cushion stone is an important component of a bridge structure and plays a role in bearing up and down for the transmission of bridge load. The structure of the cushion stone bears all the loads above the support, but the size of the structure of the cushion stone is far smaller than that of other bridge structures, and the reinforcement ratio is relatively low, so that the stress concentration of the structure of the cushion stone is caused. Under the long-term action of bridge structure load and upper portion driving load, the base stone structure quality defects such as crack, lack arris fall angle, atress inequality appear easily, leads to the service function of base stone to lose or impaired, even causes whole quality of bridge, incident. Therefore, the defective pad stones need to be repaired within the reasonable service life of the bridge. Because the traditional cushion defect repairing process has the reasons of narrow operation surface, high altitude construction difficulty, substandard repairing effect and the like, an upper structure needs to be jacked and a support system needs to be dismantled before the cushion is repaired, so that the construction difficulty is high and the construction cost is high.
Disclosure of Invention
The invention provides a construction method for repairing the defects of a bridge pad stone, which is simple in process and reliable in reinforcing effect.
The technical scheme adopted by the invention for solving the technical problems is as follows: a construction method for repairing defects of a bridge pad stone comprises a cover beam, the defect pad stone, a support and a main beam, wherein the defect pad stone is arranged at the top of the cover beam, the support is arranged at the top of the defect pad stone, and the top of the support abuts against the bottom of the main beam; the construction method specifically comprises the following construction steps:
the method comprises the following steps: chiseling the defective part of the defective pad stone; firstly, arranging a temporary support between the top surface of the cover beam and the main beam, and then chiseling off the defective part of the defective cushion stone along the periphery of the defective cushion stone to obtain the intact part of the defective cushion stone;
step two: drilling a bar planting hole; paying off the top surface of the cover beam and the surface of the intact part respectively, determining hole positions of the bar planting holes, and marking; drilling at the determined hole position, and cleaning the drilled bar planting hole after the drilling is finished;
step three: planting bars; firstly, cleaning the top surface of a capping beam, then injecting bar planting glue into a bar planting hole by using a glue gun, inserting a steel bar, and performing subsequent construction after the bar planting glue is solidified and the implanted steel bar and the bar planting glue are fully condensed;
step four: encapsulating; encapsulating the original contour edge of the defective cushion stone by using a permanent template, wherein the permanent template encloses the intact part of the defective cushion stone and the steel bars implanted in the step three together, and encloses a cavity to be grouted with the intact part and the top surface of the cover beam;
step five: grouting; injecting slurry into the cavity, wherein the slurry connects the permanent template and the repaired pad stone together to form a whole;
step six: maintaining; and monitoring the solidification time of the slurry, and removing the temporary support between the top surface of the cover beam and the main beam after determining that the solidification time reaches a preset time threshold value, so that the repair of the defective cushion stone is completed.
Further, the chiseling surfaces on the intact part in the first step are ensured to be flat and vertical, and the shortest distance between the side chiseling surfaces of the intact part and the support is greater than or equal to 5 CM.
And further, ensuring that the steel bar planting hole position in the second step avoids the cover beam and the main steel bar in the intact part, wherein the hole depth is larger than or equal to 15 times of the diameter of the steel bar, and the diameter of the hole is matched with the diameter of the steel bar.
Further, the depth of the bar planting glue injected into the bar planting holes in the step is larger than or equal to 2/3 hole depth.
Further, the reinforcing bars arranged on the cover beam in the third step, the reinforcing bars arranged on the intact parts and the main bars which are left after the defect parts are removed are mutually crossed to form a reinforcing bar net, and the two crossed reinforcing bars are fixedly connected at the crossed position.
And further, the permanent template in the fourth step is a steel plate, the outer surface of the steel plate is sprayed with antirust paint, the thickness of the steel plate is greater than or equal to 10MM, and the steel plate is fixedly connected with the adjacent steel plate.
Furthermore, the steel plates are connected with the adjacent steel plates in a welding mode.
And further, the grout in the fifth step is high-strength shrinkage grout, and is prepared by mixing high-strength non-shrinkage grouting material and water according to a certain proportion.
The invention has the beneficial effects that: the invention provides a construction method for repairing defects of bridge padstones, which can complete the whole repairing process without jacking a main beam and dismantling a support system. The construction process is simplified, and other adverse factors influencing the bridge structure caused by jacking the main beam and dismantling the support system are avoided. Moreover, the method for repairing the pad stone is simple and convenient in construction method, good in safety coefficient and reliable in repairing effect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a defective bolster mounting structure;
FIG. 2 is a schematic structural view of a bonded bar;
FIG. 3 is a diagrammatic view of a sample at position (r);
FIG. 4 is a front view of a bedding stone repair construction;
fig. 5 is a top view of a bedding stone repair structure (lacking a main beam).
Reference numerals:
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A construction method for repairing defects of a bridge bolster according to an embodiment of the present invention will be described with reference to fig. 1 to 5.
Referring to fig. 1 to 5, the construction method for repairing the defect of the bridge pad stone comprises a capping beam 100, a defect pad stone 200, a support 300 and a main beam 400, wherein the defect pad stone 200 is installed at the top of the capping beam 100, the support 300 is installed at the top of the defect pad stone 200, and the top of the support 300 abuts against the bottom of the main beam 400; the method comprises the following construction steps:
the method comprises the following steps: chiseling off the defective portion 201 of the defective pad stone 200; firstly, arranging a temporary support 500 between the top surface of the capping beam 100 and the main beam 400, and then removing all the defective part 201 of the defective cushion stone 200 along the periphery of the defective cushion stone 200 to obtain an intact part 202 of the defective cushion stone 200;
step two: drilling a bar planting hole 204; respectively paying off the top surface of the cover beam 100 and the surface of the intact part 202, and marking hole positions of the bar planting holes 204; drilling, and cleaning the bar planting holes 204 after the drilling is finished;
step three: planting bars; firstly, cleaning the top surface of the bent cap 100, then injecting bar-planting glue into the bar-planting hole 204 by using a glue gun, then inserting the steel bar 203, and performing subsequent construction after the bar-planting glue is solidified and the implanted steel bar 203 and the bar-planting glue are fully solidified;
step four: encapsulating; the original contour edge of the defective cushion stone 200 is encapsulated by a permanent template 206, the permanent template 206 encloses the intact part 202 of the defective cushion stone 200 and the steel bars 203 implanted in the step three, and encloses a cavity 207 to be grouted with the intact part 202 and the top surface of the capping beam 100;
step five: injecting the slurry 205; injecting slurry 205 into the cavity 207, wherein the slurry 205 connects the permanent template 206 with the repaired cushion stone;
step six: maintaining; and monitoring the solidification time of the repair slurry, and removing the temporary support 500 between the top surface of the capping beam 100 and the main beam 400 after determining that the solidification time reaches a preset time threshold value, so that the repair of the defective cushion stone 200 is completed.
Specifically, the construction method for repairing the defect of the bridge pad stone comprises a capping beam 100, a defect pad stone 200, a support 300 and a main beam 400. As shown in fig. 1, the defect bolster 200 is mounted on top of the capping beam 100, the support 300 is mounted on top of the defect bolster 200, and the top of the support 300 abuts against the bottom of the main beam 400. The defective part 201 of the defective pad stone 200 is located at the edge of the defective pad stone 200, and the intact part 202 of the defective pad stone 200 is located in the middle, and during the repair process, the defective part 201 of the defective pad stone 200 is firstly chiseled. However, in consideration of a problem that the support 300 and the upper structure of the support 300 may be displaced when the defective portion 201 is chiseled, a temporary support 500 is provided beside the defective bolster 200, the temporary support 500 being located between the top surface of the capping beam 100 and the main beam 400. After the temporary support 500 is set, the chiseling operation can be performed. This can prevent the main beam 400 from being displaced on the support 300, and can increase the safety factor in repair. Specifically, the temporary support 500 may be a steel plate, a steel pipe, a jack, or the like.
After the defective portion 201 is chiseled, an intact portion 202 of the defective pad 200 is obtained. Then, the top surface of the cover beam 100 and the surface of the intact part 202 are respectively drilled, the hole positions of the rebar planting holes 204 are determined and marked, and then the holes are drilled. After drilling, the bar planting holes 204 are cleaned. Specifically, the hole positions can be positioned and marked by adopting common ink lines during paying off; drilling can be carried out by adopting tools such as an air pick, an electric hammer and the like; after the drilling is completed, the impurities in the holes can be purged by high-pressure air, and the top surface of the cover beam 100 and the surface of the intact part 202 need to be cleaned. Then, a glue gun is used for injecting bar planting glue into the bar planting hole 204, then the steel bar 203 is inserted, and after the bar planting glue is solidified, the implanted steel bar 203 is subjected to subsequent construction after being stabilized (as shown in fig. 3 and 4). Specifically, the steel bar 203 is stable, that is, the steel bar 203 and the bar planting glue are sufficiently coagulated together and cannot easily shake within a reasonable stress range.
After the above steps are completed, the original contour edge of the defective cushion stone 200 needs to be encapsulated by a permanent form 206 (i.e. corresponding to a form for pouring concrete). The permanent formwork 206 encloses the intact part 202 of the defective bolster 200 and the steel reinforcement 203 implanted in step three, and encloses a cavity 207 to be grouted with the intact part 202 and the top surface of the capping beam 100. And then the permanent template 206 and the repaired cushion stone are connected together by injecting high-strength non-shrinkage slurry 205 into the cavity 207, so that the permanent template 206 and the cushion stone form an integral structure. After the repair is completed, the permanent form 206 will be able to bear together with the repaired pad without being removed. The permanent form 206 has a certain strength, the shear resistance and the compression resistance of the repaired and encapsulated cushion stone can be remarkably improved, and the permanent form 206 can inhibit the cushion stone from generating cracks again and protect the cushion stone encapsulated inside from being damaged. Specifically, the high-strength non-shrinkage grout 205 is prepared by mixing a high-strength non-shrinkage grouting material and water according to a certain proportion.
The final stage is maintenance of the newly repaired skid and removal of the temporary support 500. The method comprises the steps of monitoring the solidification time of repair slurry, determining that the solidification time reaches a preset time threshold value and reaching the performance standard, and then removing the temporary support 500 between the top surface of the capping beam 100 and the main beam 400 to finish the repair of the defective pad stone 200. Specifically, the manner of injecting the high-strength non-shrinkage slurry is adopted, in this embodiment, reaching the predetermined time threshold and reaching the performance standard means: on-site sampling is needed, and the samples are maintained for 28 days under the same conditions and then are inspected to detect the compressive strength which is required to meet the relevant specified standards (such as the Highway engineering quality inspection and assessment Standard (JTG F80/1-2004) and the Cement-based grouting Material application technical Specification (GB/T50448-2015)).
Further, it should be ensured that the chiseling surface on the intact part 202 in the first step is flat and vertical, that is, the chiseling surface is flat and cannot have a large concave-convex structure, but does not need to be smooth, and a rough surface is reserved. The concavo-convex structure is not conducive to drilling and also not conducive to the coagulation of the newly injected high-strength non-shrink grouting liquid with the intact part 202. It should be ensured that the shortest distance between the chiseling side of the intact part 202 and the support 300 is greater than or equal to 5CM, so as to ensure that the intact part 202 at the bottom of the support 300 can bear a certain heavy pressure, thereby ensuring the safety of construction.
Further, the hole of the rebar planting hole 204 in step two should avoid the main rebar in the cap beam 100 and the intact part 202, so as to prevent the main rebar in the cap beam 100 or the intact part 202 from being broken or damaged to affect the whole structure. The hole depth of the bar-planting holes 204 should be greater than or equal to 15 times the diameter of the steel bars 203 to ensure that the steel bars 203 are inserted to a sufficient depth. The diameter of the bar-planting hole 204 is matched with that of the reinforcing steel bar 203, so that the reinforcing steel bar 203 is vertically inserted into the bar-planting hole 204 and is firm and stable. In this embodiment, the diameter of the bar-planting hole 204 is 1 MM-2 MM larger than that of the steel bar 203.
Further, the height of the bar planting glue injected into the bar planting hole 204 in step 2 should be greater than or equal to 2/3 holes deep. Before the bar planting glue is injected, the inside of the bar planting hole 204 is ensured to be clean without impurities, accumulated water and the like, the height of the injected bar planting glue is larger than or equal to 2/3 holes, and then the steel bar 203 is inserted to ensure the stability of the steel bar 203. And then, the subsequent construction can be carried out after the bar-planting glue is solidified and the implanted steel bars 203 are stable.
Further, in the third step, the reinforcing bars 203 installed on the capping beam 100 and the reinforcing bars 203 installed on the intact part 202 are crossed with each other to form a reinforcing mesh, and the two crossed reinforcing bars 203 are fixedly connected at the crossed position. When the method is similar to the pouring of a house beam, the steel bars 203 are firstly made into a steel bar framework (a steel bar mesh or a steel bar cage which is prefabricated in advance) and then a reinforced concrete structure of concrete is poured for enhancing the compression strength and the shear strength of the cushion stone. In fact, in this embodiment, the reinforcing bars 203 installed on the capping beam 100 and the reinforcing bars 203 installed on the intact part 202 are also interwoven with the reinforcing bars 203 (main reinforcing bars extending from the chiseled surface) left after the defective part 201 is chiseled off to form a reinforcement cage in which new and old reinforcing bars overlap, and the two intersecting reinforcing bars 203 can be connected by binding or welding at the intersecting positions to further enhance the stability of the reinforcement cage, thereby further enhancing the compression strength and the shear strength of the repaired stone pad.
In the present embodiment, as shown in fig. 4 and 5, the permanent form 206 in the fourth step is made of steel plate, and in other embodiments, other materials with certain strength, such as aluminum alloy plate, and the like, which are pressure-resistant and shear-resistant, can be used.
The strength of the steel plate is high enough, the purpose of protecting the inside pad stone of the steel plate can be achieved, and the pad stone is prevented from generating cracks easily. And the surface of the steel plate is sprayed with antirust paint to prevent the steel plate from being rusted, so that the protection duration of the steel plate is prolonged. The thickness of the steel plate is required to be more than or equal to 10MM, the steel plate is connected with the adjacent steel plate in a welding mode, and all the steel plates form a square structure as shown in figure 5 in a surrounding mode, so that the protection strength of encapsulation is guaranteed, and the repair effect is reliable and durable.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The construction method for repairing the defects of the bridge cushion stones comprises a cover beam (100), the defect cushion stones (200), a support (300) and a main beam (400), wherein the defect cushion stones (200) are installed at the tops of the cover beam (100), the support (300) is installed at the tops of the defect cushion stones (200), and the tops of the support (300) abut against the bottoms of the main beam (400); the method is characterized by comprising the following construction steps:
the method comprises the following steps: chiseling a defective portion (201) of a defective pad stone (200); firstly, arranging a temporary support (500) between the top surface of the cover beam (100) and the main beam (400), and then completely chiseling off a defective part (201) of the defective cushion stone (200) along the periphery of the defective cushion stone (200) to obtain a complete part (202) of the defective cushion stone (200);
step two: drilling a bar planting hole (204); respectively paying off the top surface of the cover beam (100) and the surface of the intact part (202), determining hole positions of the bar planting holes (204), and marking; drilling at the determined hole position, and cleaning the drilled bar planting holes (204) after the drilling is finished;
step three: planting bars; firstly, cleaning the top surface of a cover beam (100), then injecting bar planting glue into a bar planting hole (204) by using a glue gun, then inserting a steel bar (203), and performing subsequent construction after the bar planting glue is solidified and the implanted steel bar (203) and the bar planting glue are fully solidified;
step four: encapsulating; encapsulating the original contour edge of the defect cushion stone (200) by using a permanent template (206), wherein the permanent template (206) encloses the intact part (202) of the defect cushion stone (200) and the steel bars (203) implanted in the step three, and encloses a cavity (207) to be grouted with the intact part (202) and the top surface of the capping beam (100);
step five: injecting slurry (205); injecting slurry (205) into the cavity (207), wherein the permanent template (206) and the repaired cushion stone are connected into a whole by the slurry (205);
step six: maintaining; and monitoring the setting time of the grout (205), and after determining that the setting time reaches a time threshold value needing maintenance, removing the temporary support (500) between the top surface of the capping beam (100) and the main beam (400) to finish repairing the defective cushion stone (200).
2. The construction method for repairing defects of bridge padstones according to claim 1, wherein: the chisels on the intact part (202) in the first step are horizontal and vertical, and the shortest distance between the side chisels of the intact part (202) and the support (300) is greater than or equal to 5 CM.
3. The construction method for repairing defects of bridge padstones according to claim 1, wherein: and the hole position of the bar planting hole (204) in the second step avoids the main bar in the cover beam (100) and the intact part (202), the hole depth of the bar planting hole (204) is larger than or equal to 15 times of the diameter of the steel bar (203), and the diameter of the bar planting hole (204) is matched with the diameter of the steel bar (203).
4. The construction method for repairing defects of bridge padstones according to claim 1, wherein: the height of the bar planting glue injected into the bar planting holes (204) in the step 2 is larger than or equal to 2/3 hole depth.
5. The construction method for repairing defects of bridge padstones according to claim 4, wherein: and in the third step, the reinforcing steel bars (203) arranged on the cover beam (100), the reinforcing steel bars (203) arranged on the intact parts (202) of the defective cushion stones (200) and the main reinforcing steel bars which are left after the defective parts (201) are chiseled out and extend out of the intact parts (202) are crossed with each other to form a net, and the two crossed reinforcing steel bars (203) are fixedly connected at the crossed positions.
6. The construction method for repairing defects of bridge padstones according to claim 1, wherein: and in the fourth step, the permanent template (206) is a steel plate, the surface of the steel plate is sprayed with antirust paint, the thickness of the steel plate is more than or equal to 10MM, and the steel plate is fixedly connected with the adjacent steel plate.
7. The construction method for repairing defects of bridge padstones according to claim 6, wherein: the steel plates are connected with the adjacent steel plates in a welding mode.
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| CN202010597359.7A CN111663460A (en) | 2020-06-28 | 2020-06-28 | Construction method for repairing defects of bridge pad stone |
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| CN202010597359.7A CN111663460A (en) | 2020-06-28 | 2020-06-28 | Construction method for repairing defects of bridge pad stone |
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| CN112095494A (en) * | 2020-09-30 | 2020-12-18 | 中交路桥华南工程有限公司 | Construction method for heightening bridge pad stone |
| CN112282416A (en) * | 2020-10-22 | 2021-01-29 | 四川全元新材料科技有限公司 | Concrete shallow layer defect repairing anchor, repairing structure and repairing method |
| CN112982191A (en) * | 2021-02-26 | 2021-06-18 | 中冶南方城市建设工程技术有限公司 | Rapid reinforcing device for hollow slab support base stone and construction method thereof |
| CN114370010A (en) * | 2022-01-21 | 2022-04-19 | 广东建科建筑工程技术开发有限公司 | Bridge support system repair structure and construction process |
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Application publication date: 20200915 |