How to write the bridge deck pavement guardrail safety construction plan Does anyone know

Summary. Highway guardrail bridge deck installation construction technology.

Hello dear, first of all, send the railing accessories to the place where the highway needs to be installed, and then pay off the line with a pile driver to locate the hole according to the depth requirements and clean the hole, and then put the railing pole into the drilled hole, pour in fine stone concrete, and install the horizontal railing when the concrete strength reaches more than 70%, and finally paint the reflective paint according to the design requirements and wait for the acceptance of the superior!

Highway guardrail bridge deck installation construction technology.

First of all, send the railing accessories to the location where the highway needs to be installed, and then pay off the line with a pile driver to locate the hole according to the depth requirements and clean the hole, and then put the railing into the drilled hole, pour into the fine stone concrete, install the horizontal railing when the concrete strength reaches more than 70%, and finally paint the reflective paint according to the design requirements and wait for the acceptance of the superior! Hope it helps.

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Hello, I am glad to answer for you: the specific measures for the treatment of the reinforcement of the bridge deck steel bar extending into the guardrail when the bridge deck is done during bridge construction and then the bridge deck pavement are as follows: 1. The bridge deck steel bar should be treated with anti-corrosion treatment to prevent the steel bar from rusting and affecting the service life of the guardrail.

2. Waterproof materials should be used between the guardrail and the bridge deck reinforcement to prevent the guardrail from being deformed by moisture. 3. Flexible materials should be used between the guardrail and the bridge deck reinforcement to reduce the friction between the guardrail and the bridge deck reinforcement and reduce the damage to the guardrail. 4. Wear-resistant materials should be used between the guardrail and the bridge deck reinforcement to prevent the guardrail from being damaged.

5. Insulating materials should be used between the guardrail and the bridge deck reinforcement to prevent the guardrail from being damaged. 6. Impact-resistant materials should be used between the guardrail and the bridge deck reinforcement to prevent the guardrail from being damaged. 7. Acid and alkali resistant materials should be used between the guardrail and the bridge deck reinforcement to prevent the guardrail from being damaged.

8. Fireproof materials should be used to sell pants between the guardrail and the steel bars of the bridge deck in Zen to prevent the guardrail from being damaged.

If the bridge deck steel bar extends into the guardrail, then the connection between the two must be done to enhance the bearing capacity of the guardrail. Usually this part of the reinforcement should be designed in the cushion of the stove sensitive guardrail, especially for the masonry guardrail, it can be fixed in the guardrail cushion with angle steel or special bending reinforcement, and bolts and fasteners need to be added to connect the two. In addition, in order to avoid water leakage, it is necessary to make a certain water seal at the connection between the Yanla guardrail and the bridge deck.

Hello, glad to answer for you. <>

In bridge construction, the guardrail is done first and then the bridge deck pavement, and the bridge deck reinforcement may extend into the reinforcement of the guardrail. At this time, corresponding measures need to be taken according to the specific situation: rebar shearing:

There is only a small amount of steel bars that extend into the guardrail on the bridge deck, which can be cut with tools such as steel bar shearing machines, and connected with materials such as steel bar connecting sleeves and seepage tubes. Adjust the position of the guardrail: There are many steel bars on the bridge deck extending into the guardrail, so you can consider adjusting the position of the guardrail slightly to avoid conflict with the bridge deck reinforcement.

Redesign: The bridge structure may need to be redesigned to avoid conflicts, as the number of rebars on the deck extending into the guardrail is too large and measures such as adjusting the position of the guardrail do not solve the problem. It should be noted that when carrying out the above measures, the construction quality must be guaranteed to avoid affecting the structural safety and service life of the bridge.

At the same time, it also needs to comply with relevant national regulations and standards.

.Construction plans and construction methods of major projects.

1) Conscientiously make various construction preparations before the start of construction.

1. Carry out quality and safety education, organize technical training, arrange post training, and improve the quality and safety awareness and professional and technical quality of all construction personnel.

2. Organize relevant personnel to conduct on-site investigation, conscientiously study construction drawings, technical specifications and quality standards, and make detailed construction organization design and construction technical plans; Organize all construction personnel to be familiar with the design documents, make technical disclosures, determine quality objectives, and refine and decompose them into each process and each link; Issue the construction quality and schedule plan, and implement it to each team and each person.

3. Reasonably arrange the parking place of machinery and equipment, repair and maintain the incoming equipment, and ensure the normal operation when the construction starts; Strict inspection or experiment is carried out on the incoming materials to ensure that all the materials transported to the construction site meet the technical specifications and design requirements, and are 100% qualified.

4. Carry out the C20 concrete mix test, and submit the concrete mix test report to the resident supervision engineer.

5. Prepare the commencement report, submit a detailed construction organization design and schedule, and then enter the comprehensive construction stage after the supervision engineer approves the start of construction.

2) Construction methods of major engineering projects.

1.Guardrail construction method.

1) Column positioning and lofting in strict accordance with the construction drawings.

The datum point (elevation) and datum line (plane layout) of the lofting measurement of the column in the middle zone are all curbs, that is, the column lofting is carried out with the curb stone as the benchmark; The datum point for the roadside post loft is the pavement (upper layer), and the datum is the center of the road or the shoulder edge (final form). Firstly, bridges, passages, culverts, openings in the middle zone, interchanges, etc. are used as control points, and then longitudinal ranging and positioning. The spacing between the control points is adjusted by adjusting the section, and the number of fractions of the spacing is processed by using the distribution method, so as to reduce the number of non-standard guardrail plates and avoid the piling points such as structures, communications, power pipelines, transverse drainage pipes, etc., and try to make the structures and underground pipelines fall exactly between the two columns. Clause.

2. Measure the elevation of the positioning column with a level, carefully fill in the measurement record, and mark each column with a red line. Clause.

3. After the column is loft, check the foundation condition of each column again to see if there are underground pipelines or culverts, insufficient buried soil depth at the top of the channel, etc. If so, adjust the position of some of the columns or change the way the columns are fixed. Clause.

Fourth, draw the column measurement lofting diagram and submit it to the resident supervision engineer for approval before installing the column.

1. The key points of concrete construction of all anti-collision guardrails are as follows:

1, concrete should be tested to obtain the best appearance of the mix ratio for guardrail construction, concrete pouring using part of three layers of oblique pouring method, the first layer is controlled at about 25cm, the second layer is poured to the top of the barrier about 35cm, and then poured to the top of the guardrail. When pouring, the vibrating rod should be inserted quickly and pulled slowly, so that the bubbles can fully escape. The vibrating rod should be inserted into the vibrating lower layer of concrete 5cm, so as to eliminate the layered joints; The insertion point should be evenly arranged, carried out in order, and grasp the vibration time, generally each insertion point is about 30 seconds, and the concrete surface is flat and slurry, and no bubbles shall prevail.

It is strictly forbidden to over-vibrate to avoid fish scale patterns or quicksand on the surface of the concrete, and the phenomenon of water leakage will affect the appearance. In addition, it is strictly forbidden to collide with the template during vibration, so as to avoid damage to the template and affect the appearance quality.

2. When pouring to the top surface, a special person should be sent to trim the top surface to ensure that after the guardrail is formed, the top surface is smooth and clean, and the line shape is smooth.

3. It is strictly forbidden to use mortar support pads at the bottom of the guardrail, and concrete of the same grade should be poured.

4. It is advisable to use low hydration heat cement during summer construction, and try not to use 525 cement.

1. Measure and pay-off.

Before the construction of the anti-collision guardrail, the total station is used to measure and determine the design edge of the guardrail, and the straight line section is marked with a mileage point every 5m, and the curve section is marked with a mileage point every time to ensure that the curve section changes smoothly and the overall alignment of the guardrail is smooth.

2. The template is processed by qualified manufacturers, and after the template enters the site, check the processing accuracy and quality according to the drawings, try to spell the template, and check the tightness of the adjacent template joints and whether there is any misalignment. If a problem is found, return to the factory for reprocessing in time.

3. According to the design drawings, the various steel bars required for the guardrail shall be processed in advance. During the processing process, keep the surface of the steel bar clean, the bending angle meets the requirements, and do a good job in the anti-rust maintenance of the prefabricated steel bar.

4. The welding between the main reinforcements on site shall be operated in strict accordance with the requirements for welding in the specification, and the double-sided welding length of the steel bar shall not be less than 5d (d is the diameter of the steel bar), and the single-sided welding length shall not be less than 10d. Other steel bars are connected by lashing, and the intersection points should be tied tightly, and if necessary, they should be connected by spot welding.

5. Control the thickness of the protective layer of the steel bar as required, the steel bar is tied strictly according to the measurement edge, and the plum blossom type cushion block is arranged to ensure the thickness of the side protective layer.

6. The surface of the formwork should be cleaned and free of rust and concrete. Apply the release agent evenly on the surface of the template, and it is strictly forbidden to miss the brush or apply the tear phenomenon unevenly.

7. Each guardrail inner template is provided with a square timber outward support and a tension inward to adjust the verticality of the template and maintain the overall stability. During on-site construction, the verticality of the template is measured with a level, and then the tightness is adjusted through the action of the square wood support top and the two-way thread buckle of the tendon, so that the template remains completely vertical, the adjacent template does not occur dislocation, and each span template firmly forms a whole to ensure that the alignment of the pouring anti-collision guardrail is straight and beautiful.

8. The anti-collision guardrail is pre-embedded with street lamp holders and cable box brackets, the embedded position is accurate, and the specifications and dimensions meet the design requirements. The bracket channel steel is embedded along the bridge deck and the overall linear shape is smooth, and it is strictly forbidden to have uneven levels of adjacent brackets, which will affect the subsequent construction of the project.

9. The guardrail concrete is poured and vibrated in two layers, and the first layer of material is slightly higher than the lower part of the formwork, and the vibration is sufficient; Then the second layer of concrete is poured to the top surface of the formwork, and the pouring and vibrating of the upper concrete are completed before the initial setting of the lower layer of concrete.

10. Shrinkage joints should be set up on the anti-collision guardrail according to the design requirements, and the construction of shrinkage joints adopts the method of sandwiching foam boards with two steel plates, and the two steel plates are connected with the template with bolts respectively, and the spacing of the broken joints poured out is equal, and the edge ridge line is straight and smooth, and the shape is beautiful. However, it should be noted that the broken steel plate is one day later than the guardrail formwork, and the chain block and other tools are used to evenly exert tension to the steel plate, and the steel plate is slowly pulled out to avoid damage to the edges and corners of the guardrail.