CN105113421A - Construction method for polishing outer mold of precast box beam - Google Patents

Abstract

The invention discloses a construction method for polishing an outer mold of a precast box beam. The construction method is used for polishing an inner mold and the outer mold of a precast concrete structural component, brushing a demolding agent on the polished inner mold and the polished outer mold of the precast concrete structural component, and casting a concrete structural article of which the construction period is short in place. The construction method sequentially comprises the following steps: cleaning a base; regulating the size of a wedge block at the bottom of the beam; sticking sealing strips on the outer mold; assembling the outer mold; polishing a formwork, and removing dust; spraying the demolding agent; and after acceptance inspection is qualified, sending semi-finished products into following operation procedures. Handheld polishing equipment is utilized to cleanly polish a staggered platform on the surface of the formwork and residual concrete, an air compressor is used for continuous pressurization so as to spray the demolding agent in a handheld oil tank through a high pressure, the brushing thickness of the demolding agent sprayed in the manner is easier to control than the brushing thickness of the demolding agent sprayed manually, an oil path runoff is not formed in the surface of the formwork, and the color of the outer surface of the box beam can be effectively controlled; the air compressor is adopted to be combined with a spray gun so as to perform pressurized spraying, a uniform isolating layer is formed on the surface of the formwork, and the situation that runoff is formed because too much oil is brushed by using a traditional roller brush is avoided; the concrete surface is smooth after the mold is disassembled, and the appearance color is uniform.

Description

Prefabricated case beam external mold polishing construction method

Technical field

The present invention relates to field of civil engineering, the prefabricated case beam external mold polishing construction method of carrying out when specifically relating in precast unit external mold polishing brushing release agent and the shorter cast-in-place concrete structure thing of construction period.

Background technology

Concrete presentation quality is the embodiment directly perceived of concrete engineering quality; protect reinforcing bar not by corrosion especially; ensure the effective measures of concrete structure durability; therefore improve the concrete component that concrete presentation quality has its significance particularly to expose to concrete work, presentation quality more should tighten control.The form of structure of what the precast beam of current many bridges, grand bridge adopted is case beam, concrete is once build shaping, and its outward appearance occurs that defect will be difficult to make up, and leaves hidden danger to workmanship.In order to make the concrete outward appearance of prefabricated case beam can reach excellent, certain measure must be taked.

Summary of the invention

For the technical problem existed in prior art, the object of the present invention is to provide a kind of prefabricated case beam external mold polishing construction method.

To achieve these goals, the technical solution adopted in the present invention is: a kind of prefabricated case beam external mold polishing construction method, and step is as follows:

1. step clears up base

Before construction, base is cleaned out, and surface without concrete remnant, and according to design inverted camber repetition measurement base absolute altitude, should be repaired the problematic base of inverted camber in time, linear smooth-going after guaranteeing prefabricated case beam stretch-draw, surfacing;

2. step regulates wedge size at the bottom of beam

The template adopted due to case beam is set shaped steel formwork, and horizontal wall inscription is unified is customized to 2%, during as prefabricated curved section or mild wet air oxidation superelevation paragraph case beam, needs by regulating wedge size at the bottom of beam to adjust beam face horizontal wall inscription;

The adjustment of wedge size regulates steel plate height by bolt or regulates wedge size to realize by sandbox;

Step is external mold adhesive seal bar 3.

Template and form joint place are effective Control architecture spillage, paste 6cm wide in template and form joint place, 8mm thick EVA high density foam;

Step is assembled external mold 4.

The assembled of template is carried out after base acceptance(check); Box girder formwork adopts the Stainless Molding Board of machine-shaping, and template first carries out pre-splicing dress, carries out polishing and numbering after assembled; By the verticality of spirit level Control architecture during model sheetinstallat, ensure that template position is accurate; Template connects use high-strength bolt; Die plate base uses and carries out drawing to pull bar, the off normal of Control architecture; During the template assembly of inner side and outer side, within planeness adjusts to 5mm, between adjacent forms, faulting of slab ends can not be had;

According to design and code requirement after model sheetinstallat, the straight degree of detection template, planeness, to the fastness of drawing and pushing up drawing at the bottom of plate joint dislocation, external mold and bed die binding site tightness, template; Detect and qualifiedly can carry out next procedure;

Step is template polishing dedusting 5.

After template assembly completes, employing steel brush wheel sander removing template surface concrete remains, and adopts faulting of slab ends between wheel sander polishing template;

6. step sprays release agent

Adopt spraying coating process, release agent adopts white oil;

Step 7. acceptance(check) enters next procedure.

Prefabricated case beam external mold polishing construction method of the present invention, its beneficial effect shows:

1, utilize hand-held grinding apparatus that template surface faulting of slab ends and concrete are remained polishing clean, and utilize air compressor machine to continue supercharging by the high-pressure fog of hand-held oil tank inner pattern releasing agent applicable, and spray release agent and operate and better control smearing thickness than artificial brushing, and oil circuit runoff can not be formed at template surface, can effective control cabinet beam external surface color and luster

2, adopt air compressor machine to carry out pressure atomization in conjunction with paint gun, form the uniform separation layer of one deck at template surface, can not smear too much due to oil as conventional rollers brush and form runoff, after form removal, concrete surface be smooth, and appearance luster is even.

3, spray release agent new method and can improve construction level, accelerate construction speed, shorten template turn around time, shorten the beam duration processed, reduce management cost.Adopt spraying mold release technologies control cabinet beam concrete appearance can save later stage artificial decoration cost, and spraying coating process quick construction, save material, there is good economic benefit.Adopt spraying mold release technologies to reduce environment pollution, meet construction environmental requirement, there is good social benefit.

Accompanying drawing explanation

Fig. 1 is the workflow diagram of prefabricated case beam external mold polishing construction method.

Detailed description of the invention

For further describing prefabricated case beam external mold of the present invention polishing construction method, below in conjunction with accompanying drawing, it is described further.

Refer to shown in Fig. 1, a kind of prefabricated case beam external mold polishing construction method, step is as follows:

1. step clears up base

Before construction, base is cleaned out, and surface without concrete remnant, and according to design inverted camber repetition measurement base absolute altitude, should be repaired the problematic base of inverted camber in time, linear smooth-going after guaranteeing prefabricated case beam stretch-draw, surfacing;

2. step regulates wedge size at the bottom of beam

The template adopted due to case beam is set shaped steel formwork, and horizontal wall inscription is unified is customized to 2%, during as prefabricated curved section or mild wet air oxidation superelevation paragraph case beam, needs by regulating wedge size at the bottom of beam to adjust beam face horizontal wall inscription;

The adjustment of wedge size regulates steel plate height by bolt or regulates wedge size to realize by sandbox;

Step is external mold adhesive seal bar 3.

Template and form joint place are effective Control architecture spillage, paste 6cm wide in template and form joint place, 8mm thick EVA high density foam;

Step is assembled external mold 4.

The assembled of template is carried out after base acceptance(check); Box girder formwork adopts the Stainless Molding Board of machine-shaping, and template first carries out pre-splicing dress, carries out polishing and numbering after assembled; By the verticality of spirit level Control architecture during model sheetinstallat, ensure that template position is accurate; Template connects use high-strength bolt; Die plate base uses and carries out drawing to pull bar, the off normal of Control architecture; During the template assembly of inner side and outer side, within planeness adjusts to 5mm, between adjacent forms, faulting of slab ends can not be had;

According to design and code requirement after model sheetinstallat, the straight degree of detection template, planeness, to the fastness of drawing and pushing up drawing at the bottom of plate joint dislocation, external mold and bed die binding site tightness, template; Detect and qualifiedly can carry out next procedure;

Step is template polishing dedusting 5.

After template assembly completes, employing steel brush wheel sander removing template surface concrete remains, and adopts faulting of slab ends between wheel sander polishing template;

6. step sprays release agent

Adopt spraying coating process, release agent adopts white oil;

Step 7. acceptance(check) enters next procedure.

This construction technology is general in the application of area, Guangdong Province

Case history one, wide express passway Jiangmen, Buddhist river section (K2+720 ~ K44+100) engineering-Heshan connecting line Buddhist open high speed bridge crossing

1.1 project profile

Heshan connecting line Buddhist is opened high speed bridge crossing and is positioned at Gu Qiao village, Ya Yao town, Heshan City, bridge center mileage is LK1+341.5, bridge construction form adopts prestressing force freely-supported small box girder+beam structure form, bridge adopts 10 × 20+18 × 25+10 × 34+39.9+55+39.9+15 × 25 across footpath combination, total length 1499.8m.

1.2 condition of construction

Opening in the construction of high speed bridge crossing prefabricated small box girder at Buddhist has used template to spray release agent construction technology, this bridge prefabricated small box girder Liang Chang is positioned at Buddhist and opens after high speed bridge crossing 0# platform platform on roadbed, its prefabricated box-beam all adopts stainless steel punching block, in conjunction with spraying release agent, adopt this construction technology, reach standardized construction management expectancy.

Case history two, damp favour speedway are marched into the arena the overhead 1# bridge in road

2.1 project profile

This contract section is marched into the arena by International airport, Chaozhou-Shantou region, 1# Qiao Denggang town, road, starting point K17+471.5, terminal K21+325.5, overall length 3.854 kilometers.Wherein 30m small box girder 1045,27m small box girder 185,25m small box girder 40, all adopts prefabricated construction.

2.2 condition of construction

Four work area beam making fields arrange 3 track production lines, comprise steel bar meter district, Zhi Liang district, beam strorage area, area is about 40000m2, the beam task processed that primary responsibility produces western small stream bridge, Shan takes off interchange ramp, lower Zheng great Qiao, road of marching into the arena overhead 1# bridge, airport thing ring road on bridge, Pu on high speed bridge crossing, Pu, prefabricated case beam amounts to 3310, wherein 63,20m case beam, 20,23.5m case beam, 1900,25m case beam, 233,27m case beam, 1094,30m case beam.

Case history three, flood row river grand bridge

Engineering monitoring and evaluation of result

After have employed Stainless Molding Board spraying release agent technology, box beam concrete outward appearance has had and has significantly improved, and concrete presentation quality reaches excellent.Solve greasy dirt and too much pollute water channel, bring good environment protecting.Construction overall process is in controllable state that is safe, stable, quick, high-quality, receives affirmative and the favorable comment of owner and supervisor, achieves good economic benefit and social benefit simultaneously.

Above content is only to design example of the present invention and explanation; affiliated those skilled in the art make various amendment to described specific embodiment or supplement or adopt similar mode to substitute; only otherwise depart from the design of invention or surmount this scope as defined in the claims, the protection domain of wood invention all should be belonged to.

Claims (1)

1. a prefabricated case beam external mold polishing construction method, is characterized in that step is as follows:

1. step clears up base

Before construction, base is cleaned out, and surface without concrete remnant, and according to design inverted camber repetition measurement base absolute altitude, should be repaired the problematic base of inverted camber in time, linear smooth-going after guaranteeing prefabricated case beam stretch-draw, surfacing;

2. step regulates wedge size at the bottom of beam

The template adopted due to case beam is set shaped steel formwork, and horizontal wall inscription is unified is customized to 2%, during as prefabricated curved section or mild wet air oxidation superelevation paragraph case beam, needs by regulating wedge size at the bottom of beam to adjust beam face horizontal wall inscription;

The adjustment of wedge size regulates steel plate height by bolt or regulates wedge size to realize by sandbox;

Step is external mold adhesive seal bar 3.

Template and form joint place are effective Control architecture spillage, paste 6cm wide in template and form joint place, 8mm thick EVA high density foam;

Step is assembled external mold 4.

The assembled of template is carried out after base acceptance(check); Box girder formwork adopts the Stainless Molding Board of machine-shaping, and template first carries out pre-splicing dress, carries out polishing and numbering after assembled; By the verticality of spirit level Control architecture during model sheetinstallat, ensure that template position is accurate; Template connects use high-strength bolt; Die plate base uses and carries out drawing to pull bar, the off normal of Control architecture; During the template assembly of inner side and outer side, within planeness adjusts to 5mm, between adjacent forms, faulting of slab ends can not be had;

According to design and code requirement after model sheetinstallat, the straight degree of detection template, planeness, to the fastness of drawing and pushing up drawing at the bottom of plate joint dislocation, external mold and bed die binding site tightness, template; Detect and qualifiedly can carry out next procedure;

Step is template polishing dedusting 5.

After template assembly completes, employing steel brush wheel sander removing template surface concrete remains, and adopts faulting of slab ends between wheel sander polishing template;

6. step sprays release agent

Adopt spraying coating process, release agent adopts white oil;

Step 7. acceptance(check) enters next procedure.