What are the construction procedures of cantilever pouring and what are the construction procedures

Assemble the bracket of the No. 0 beam section and preload it according to the design requirements Construction of the No. 0 beam section Assemble the hanging basket Construction of the No. 1 beam section on the hanging basket The hanging basket moves forward and circulates the construction of other beam sections The closing section is constructed in accordance with the closing order of the design requirements The hanging basket is removed and the bridge deck construction is carried out.

Precautions for construction:

Helmet. Safety helmets must be worn on the construction site. There are two points to pay attention to when wearing a helmet correctly, one is that the cap lining and the shell can not be close together, there must be a certain gap, the top gap is 20mm-50mm, and the surrounding area is 5mm-20mm.

When something falls on the helmet shell, the cap lining can play a cushioning role to protect the head and cervical vertebrae, and the hat lining cannot be taken off for use; Second, it is necessary to fasten the hat strap to prevent accidents caused by multiple strikes of objects.

Tensioning and closing:

1. In the construction of prestressed concrete continuous beam cantilever construction, the tension sequence of the longitudinal prestressed tendons of the roof and web is generally symmetrical tension up and down, left and right, and when the design is required, it is in accordance with the design requirements.

2. The closing sequence of pouring prestressed concrete continuous beams is generally the first side span, then the second span, and then the middle span.

3. The closing, system conversion and support reaction adjustment of the continuous beam (T structure) shall comply with the following provisions:

1) The length of the closure section should be 2 meters.

2) The relationship between the temperature change and the elevation of the beam end and the distance between the cantilever ends should be observed before closing.

3) Before closing, the two cantilever ends should be temporarily connected according to the design regulations, and the temporary anchorage of the pier across one side of the closing span should be relaxed or changed into a movable bearing.

4) Before closing, the cantilever at both ends is pre-pressurized, and gradually removed in the process of pouring concrete, so that the deflection of the cantilever end is stable.

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The pro-cantilever pouring construction procedure is as follows: cantilever pouring construction process: cast-in-situ pier top zero section and temporary consolidation symmetrical installation of hanging baskets on both sides of section zero symmetrical cantilever pouring side hole beam section bracket cast-in-situ first side span and then secondary span and finally middle span closure.

The cantilever structure refers to the fact that one end of the beam is a fixed support that does not produce axial and vertical displacement and rotation, and the other end is the end of the self-wheel (which can generate forces parallel to the axial direction and perpendicular to the axial direction). In the analysis of engineering mechanics forces, a typical simplified model is compared.

In the actual engineering analysis, most of the actual engineering stressed components can be reduced to cantilever beams. The cantilever structure is characterized by the following: lifting devices, pivots, articulation members.

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Hello, what are the cantilever pouring method construction projects, which are as follows:Cantilever pouring using hanging basket construction, belongs to the high place operation, in addition to the relevant provisions of the high place operation, and should comply with the following provisions: 1) after the cable-stayed bracket and hanging basket assembly, should be fully inspected, and do the loading test.

2) Carry out the construction of the zero block on the pier, and when the cable-stayed bracket is used as the construction platform, at the edge of the bottom mold platform, a temporary guardrail should be set up around the safety net, and the escalator is installed. The pavement board erected by the cable-stayed bracket platform and the water-dividing tip bracket platform must be firmly connected, and anti-skid measures should be taken on the sidewalk slab. 0 After the mold is removed, a part of the platform should be retained for health preservation and other operations.

3) The machinery and equipment used should be inspected (such as jacks, pulleys, chain hoists, wire ropes, etc.), and there should be sufficient safety factors. It is strictly forbidden to use it if it does not meet the safety regulations. 4) Before construction, relevant personnel should be organized to make safety technical disclosures, formulate safety technical measures, and check whether the safety protection equipment is complete.

5) Check the position and firmness of the pier embedded parts and the cable-stayed steel belt, and whether they meet the design requirements. 6) In case of strong wind and bad weather, the operation should be stopped. 2.

When working in a double layer, the operators must strictly abide by their respective job responsibilities to prevent the rapid air source from leaking and dropping iron tools. 3.When the hanging basket is used, it should be checked frequently whether the rear anchor bars, jacks, chain hoists, tensioning platforms and safety ropes are safe and reliable.

When the elevation of the bed mold is adjusted, a special person should be set up to command it in a unified manner. Workers should be laid with stable scaffolding boards under their feet and wear safety belts. 4.

In the installation, walking and use of the hanging basket, the load should be strictly controlled to prevent the impact and vibration of overload. If it is necessary to add additional facilities (such as rainproof shelters, derricks, cold-proof shelters, etc.) to the hanging basket, the structure of the hanging basket shall not be damaged and its stress form shall not be changed. 5.

Hanging basket assembly and cantilever assembly, the danger is greater, when operating at high places and Xingshui, safety nets should be set up, scaffolding springboards should be set up, temporary guardrails should be set up, and operators must wear safety protection equipment according to the regulations, equipped with life-saving facilities. 6.When using hanging buckets, their location, water addition, etc. should meet the design requirements.

Drainage facilities and methods should be safe and reliable. In the construction of the inadequacy, the above conditions should be regularly inspected. 7.

Before the bottom die swings, it is necessary to check in detail whether the position of the hanging basket, the rear end pressure and the installation of the rear boom meet the requirements. The two slings of the upper beam should be connected to the side of the lower beam of the bottom die, and the safety should be confirmed before swinging. 8.

When hanging the basket, do it slowly. The speed should be controlled within 10 cm. At the back of the hanging basket, a set of slip ropes is set up to ensure safety.

The slideway should be paved smoothly and straight, without offset, and pay attention to observation at any time, and deal with problems in time. 9.When pouring concrete, the rear end of the hanging basket truss should be anchored on the completed beam section, and the counterweight should be balanced with the weight of the poured concrete.

When the hanging basket truss walks and pours concrete, its stability coefficient shall not be less than that when pouring the concrete of the closing section, the cantilever end is pre-pressurized, and when the loading is gradually withdrawn with the pouring process and loading, it should be from the top up.

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The construction works of the pro-cantilever pouring method are: cantilever pouring construction (hanging basket method): starting from the pier, the symmetrical cast-in-situ beam sections on both sides until the middle of the span is closed.

Cantilever assembly construction (cantilever method): starting from the bridge pier, the prefabricated segments will be assembled symmetrically on both sides. The main equipment of the cantilever pouring method is a pair of hanging baskets that can walk, and the hanging baskets move on the beam section that has been stretched and anchored and connected with the pier body as a whole, and the binding of steel bars, vertical molds, pouring concrete, and applying prestress are carried out on it.

After the completion of the construction of this section, the hanging basket moves one section symmetrically forward, carries out the construction of the next pair of beam sections, and moves forward in order until the pouring of the cantilever beam section is completed. Hope mine can help you <>

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1. The construction of the cantilever beam refers to hanging the cantilever hole core of the beam body prefabricated at the construction site on the beam bottom plate, and the beam body is suspended on the beam bottom plate through the noose; The suspension pouring construction refers to the structure of pouring concrete on the bottom plate of the beam and digging concrete, and forming a trembling sail into a beam body.

2. The beam body of the cantilever beam construction is generally prefabricated, and the tensile strength, compressive strength and flexural strength of the concrete structure of the poured beam body are high, and the settlement is less; The beam body of the suspension pouring construction is poured on site, and the tensile strength, compressive strength and flexural strength of the structure are low, and the settlement is large.

3. The construction period of the cantilever beam construction is short, the seismic performance is good, and the reinforcement beam structure can be used in a variety of ways; The construction period of the suspension pouring construction is long, the seismic performance is poor, and the reinforcement beam structure can only adopt a few ways.

The cantilever method pouring method is also known as the non-bracket balanced outrigger method or the hanging (hanging) basket method, and the main equipment used is the hanging basket. By moving the hanging basket forward, the concrete is symmetrically poured into the middle of the two sides of the span section by section, and prestress is applied, and so on.

Its construction process: the hanging basket is moved forward in place, the leveling template (steel bar production) is installed, the bottom plate and the web reinforcement are installed, the inner mold is installed, the roof reinforcement is bound, the prestressed pipeline is installed, the supervision engineer is accepted, the concrete is poured (the test block is made), the concrete is cured, the film is removed and the joint is treated, the prestressed tendon is cut, the bundle is pierced, the prestressed tendon is stretched, the anchor is sealed, and the grouting is moved forward in place.

Rebar binding, acceptance, formwork, acceptance, concrete pouring, maintenance.

Summary. Cantilever pouring method construction sequence, hanging basket assembly; The installation quality should be comprehensively checked, and the load test should be done according to the design load to eliminate the inelastic deformation and pouring section; The pouring of the four parts of the cantilever beam body, the suspension pouring sequence and requirements, tensioning and closing, and elevation control.

The construction sequence of the cantilever pouring method, the assembly of the hanging basket; Brother You should have a comprehensive banquet to check the installation quality, and should do a load test according to the design load to eliminate inelastic deformation and pouring sections; The pouring of the four parts of the cantilever beam body, the suspension pouring sequence and requirements, tensioning and closing, and elevation control.

Can you go to the hanging basket first, in the grouting. OK.