CN113481795A - Concrete simply-supported small box girder road butt joint construction process - Google Patents
Concrete simply-supported small box girder road butt joint construction process Download PDFInfo
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- CN113481795A CN113481795A CN202110625728.3A CN202110625728A CN113481795A CN 113481795 A CN113481795 A CN 113481795A CN 202110625728 A CN202110625728 A CN 202110625728A CN 113481795 A CN113481795 A CN 113481795A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/50—Removable forms or shutterings for road-building purposes; Devices or arrangements for forming individual paving elements, e.g. kerbs, in situ
- E01C19/502—Removable forms or shutterings, e.g. side forms; Removable supporting or anchoring means therefor, e.g. stakes
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/16—Reinforcements
- E01C11/18—Reinforcements for cement concrete pavings
- E01C11/20—Reinforcements for cement concrete pavings for prestressed concrete pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4833—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/03—Arrangements for curing paving; Devices for applying curing means; Devices for laying prefabricated underlay, e.g. sheets, membranes; Protecting paving under construction or while curing, e.g. use of tents
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/16—Prestressed concrete paving
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Abstract
The invention belongs to the technical field of road construction, in particular to a concrete simply supported small box girder road butt joint construction process, which comprises the following steps: s1, manufacturing a bottom die, namely transversely paving 16-number channel steel with the same width as the box bottom on the basis of an original foundation concrete surface layer (the surface layer is made of a steel plate with the thickness of 1 cm), and paving 16-number channel steel on the transversely paved 16-number channel steel with the same width as the box bottom at intervals of 30cm longitudinally to form the bottom die; s2, manufacturing the steel bars, keeping the surfaces of the steel bars clean and straight, and configuring a shaping jig frame in the precast beam yard. According to the concrete simply-supported small box girder road butt joint construction process, the concrete simply-supported small box girder is arranged to butt joint the road, so that the problem that the railway and the expressway cross the whole main city area of Songjiang river to block the axial road transportation in the main city area is effectively solved, the external development of the city is fused with the space of the peripheral area, and the collecting and distributing functions of a road network are fully exerted.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a concrete simply supported small box girder road butt joint construction process.
Background
Road engineering refers to the whole process of planning, designing, constructing, maintaining and managing work performed by taking a road as an object and the engineering entity engaged in the whole process. Road works, like civil engineering of any other door type, have obvious technical, economic and management characteristics, the subgrade being both the main body of the route and the foundation of the road surface and bearing the vehicle load together with the road surface. The subgrade is divided into a embankment type, a cutting type and a half-filling and half-digging type according to the filling and digging conditions of the cross section of the subgrade. The road shoulder is the inner zone of the two sides of the road bed edge for supporting the road surface and temporarily stopping vehicles or pedestrians for walking. The roadbed earth-rock engineering is divided into earth engineering (three levels of loose soil, common soil and hard soil) and stone engineering (three levels of soft stone, secondary hard stone and hard stone) according to the difficulty of excavation;
railways and highways are built in urban areas for main traffic, part of railways and highways can cross the main urban areas, the axial road traffic transportation of the main urban areas is seriously hindered, the connection between the main urban areas and surrounding counties is inconvenient, the external development of cities and the space fusion with the surrounding areas are limited, a plurality of broken roads are formed, the detouring distance of road traffic is increased, the collecting and distributing functions of a road network cannot be fully exerted, the traffic is seriously congested in the rush hours of working and working of people, the traffic can only detour through nearby roads, and the time and labor cost is increased;
therefore, a concrete simply-supported small box girder road butt joint construction process needs to be provided.
Disclosure of Invention
Based on the technical problems that the existing part of railways and expressways can cross the main urban area, the axial road traffic transportation of the main urban area is seriously hindered, the external development of the city and the space fusion with the peripheral area are limited, a plurality of broken roads are formed, the detouring distance of the road traffic is increased, the rush hours of working and working off cause serious traffic jam, the traffic can only detour through the nearby roads, and the time and labor cost are increased, the invention provides the concrete simply-supported small box girder road butt joint construction process.
The invention provides a concrete simply-supported small box girder road butt joint construction process, which comprises the following steps of:
s1, manufacturing a bottom die, namely transversely paving 16-number channel steel with the same width as the box bottom on the basis of an original foundation concrete surface layer (the surface layer is made of a steel plate with the thickness of 1 cm), and paving 16-number channel steel on the transversely paved 16-number channel steel with the same width as the box bottom at intervals of 30cm longitudinally to form the bottom die;
s2, manufacturing steel bars, configuring a shaping jig frame in a precast beam field, and integrally manufacturing a steel bar framework;
before installing the reinforcing steel bars, marking a central line on the bottom die, and arranging and installing the bottom die from the central line to two sides according to the size of a construction drawing;
s3, manufacturing a corrugated pipe, arranging the positioning ribs in a # -shape of the corrugated pipe, arranging one linear section at intervals of 1m and one curved section at intervals of 50cm, penetrating the corrugated pipe, and connecting joints by adopting a hot melting process;
s4, template manufacturing, wherein the outer membrane is a standardized integral steel template, the thickness of a steel plate is not less than 8mm, each set of template is provided with a corresponding wedge block template for adjustment, the length of each independent steel plate is 6 meters, the connection between the steel plates is fixed by a positioning pin and then supported by a bolt fastening method, the bottom of the steel plate is supported by a landing method, and the inner mold is supported by a two-end drawing method after the concrete reaches certain strength;
arranging 2 phi 100mm round holes in the middle of the bottom of each internal mold for exhausting, observing that bottom plate concrete overflows when the bottom plate concrete is poured, then entering the round holes on the bottom surface of the closed internal mold from a window when the concrete is to be poured, arranging a crossbeam made of No. 30 channel steel on top layer steel bars every 60cm after the internal molds are installed in place and connecting with an external membrane, welding two phi 32mm steel bars in the middle to clamp the top surface of the internal mold, and finally pressing a mold beam by adopting a 50 x 250cm concrete block;
s5, stirring concrete, covering the top of the post by geotextile or plastic cloth after pouring and tamping, watering at regular time, and prolonging the form removal time according to specific conditions;
s6, bundling, namely, enabling the steel wire which is woven into a bundle to penetrate into the hole by taking a phi 6 steel bar as a lead wire, and reserving working lengths of 70cm at two ends respectively;
s7, tensioning the prestressed steel beams when the concrete strength reaches the design specified value and the age requirement;
adopting a synchronous stretching method at two ends of an intelligent stretching machine to stretch, and performing stretching stress and elongation correction calculation according to the actually measured elastic modulus of the steel strand during stretching;
s8, pulping, wherein after the prestressed tendons are tensioned, the pore passages are pressed to be grouted as early as possible, and grouting equipment adopts vacuum grouting equipment after grouting is finished within 24 hours generally;
after grouting, the cement at the beam end is washed clean, and simultaneously, dirt of a supporting base plate, an anchorage device and end face concrete is removed so as to prepare for pouring anchor sealing concrete, the beam length is checked after the anchor sealing and erecting die, and the anchor sealing concrete is carefully operated and carefully inserted and tamped so that the concrete at the anchorage device is compact.
Preferably, in S3, for the accuracy of guaranteeing the reservation pore position, the end mould closely laminates with side form and die block to perpendicular with the pore axis, the coordinate position is annotated to the pore pipe fixed position, and the anchor backing plate serial number is so that steel strand wires arrange the pair number and is gone into the seat, the bellows penetrates before pouring and compares the little 1 cm' S of bellows internal diameter plastic hose, plastic hose in time takes out after the concrete initial set, the effective structure muscle of bellows carries out the lock ring with its week according to every 50cm shelves at an interval, and the section of starting to bend is according to the construction needs suitably encryption.
Preferably, in S4, the anchor backing plate is one of the main stress devices for transmitting the tensile force to the beam, and the anchor backing plate is perpendicular to the steel bundle and fixed by the structural bars during positioning, so that the anchor backing plate, the steel form and the steel skeleton are integrated, thereby facilitating transmission and positioning and fixing.
Preferably, in S5, a vibrating rod with a diameter of 30 to 50 is selected for vibrating when casting to avoid cracking the concrete surface and damaging the concrete surface and edges, the mechanically vibrated parts are slightly vibrated according to the regulations, the parts where the vibrating rod cannot reach can be vibrated by using a wooden hammer to knock a side mold and reinforcing steel bars for auxiliary vibrating, the concrete stirring and casting must be completed within 2 hours, casting is prohibited in rainy days, in the concrete casting process, the outer film and the support are observed, particularly, the inner mold floats upwards, bubbles in the concrete are removed to help prevent concrete from being separated due to excessive vibration, and casting is prohibited in rainy days to ensure the concrete quality and prevent concrete from being separated.
Preferably, in S7, when the error between the actual elongation of the tendon and the calculated value exceeds 6%, the tensioning is suspended, and after the reason is found and measures are taken to adjust, the tensioning can be continued.
Preferably, the tensioning sequence of the prestressed steel bundles is designed according to a diagram and is symmetrical to the vertical axis of the section of the member, the upper edge and the lower edge of the member are not allowed to exceed an allowable value, after one bundle is pulled, whether the conditions of wire breakage and wire sliding of the bundle are within a specified requirement range is determined, if the bundle is pulled again, the prestressed steel strands are anchored after the tensioning control force is stable, a grinding wheel machine is used for cutting off redundant steel strands at the end, the anchorage device is protected by concrete, and when the prestressed steel strands need to be exposed for a long time, a measure for preventing corrosion is taken.
Preferably, the tensioned steel bundle seals the gap between the steel bundles around the anchor plug tightly through cement paste in time.
Preferably, in S8, when the air temperature is lower than 5 ℃ in the grouting process and 2 days after grouting, the grouting operation is prohibited without reliable heat preservation measures, and the process is continued, and the waste slurry is discharged from the outlet of the vacuum grouting equipment until the waste slurry without frothy gas is discharged, and the consistency is the same as that of the grouting.
Preferably, the vacuum grouting apparatus is thoroughly washed with clean water at least once every three hours during grouting operation, and also washed once at the end of each day of use.
Preferably, the anchor sealing concrete is kept stand for 1-2 hours after being poured, watering and curing are carried out with a mold, after demolding, the general watering and curing time is not less than 7 days at normal temperature, the watering and curing are not carried out when the temperature is lower than 5 ℃ in winter, the curing time is prolonged, heat preservation measures are adopted, automatic spraying and curing measures can be installed for curing, geotextile is used for covering the bottom of the beam, and sufficient humidity and temperature are kept.
The beneficial effects of the invention are as follows:
1. by arranging and positioning the anchor backing plate, the tensioning and anchor backing plate can be tightly combined and fixed by the structural bars, so that the anchor backing plate, the template and the reinforcement cage are integrated, force transmission can be facilitated, and positioning and fixing can be realized.
2. Use the vibrating rod to vibrate corresponding position a little when watering and tamping through the setting, and then get rid of the bubble in the concrete, prevent that the excessive vibration from smashing and causing the concrete segregation.
3. The concrete simply-supported small box girder is arranged to butt the road, so that the problem that the railway and the highway cross the whole main city area of the Yangtze river to block the axial road transportation in the main city area is effectively solved, the external development of the city is integrated with the space of the peripheral area, and the collecting and distributing functions of a road network are fully exerted.
Drawings
Fig. 1 is a flow chart of a concrete simply supported small box girder road butt joint construction process provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a concrete simply supported small box girder road butt joint construction process includes the following steps:
preparing construction materials, wherein the concrete is self-mixing C50 concrete, the concrete raw materials are strictly tracked and controlled, the cement of the same manufacturer is guaranteed to be adopted all the time, the appearance color of the member is kept consistent, the cement has the quality guarantee of the manufacturer, the bulk cement is tested again according to the batch of less than or equal to 500t, and the cement can be used after the cement is qualified;
the sand for concrete is selected from medium-coarse sand with reasonable gradation, hard and clean texture, all technical indexes meet the standard specification, and the sand is re-tested according to the quantity of less than or equal to 600t per batch after entering a factory and can be used after being qualified;
the concrete stone adopts hard broken stone with the specification of not more than 40mm, each technical index meets the standard specification, the stone is tested again according to the condition that each batch is not more than 600t after entering a factory, and the stone can be used after being qualified;
the concrete admixture selects FOX-simon600 high-performance water reducing agent, each technical index meets the standard specification, and the concrete admixture is re-tested according to the condition that each batch is less than or equal to 10t after entering a factory and can be used after being qualified;
the steel strand adopts the national standard of 1 × 7-15.2-1860-GB/T5224-. The test is carried out again according to that each batch is less than or equal to 60t after entering the factory, and the qualified product is put into use;
hot rolled plain steel bars are used for concrete, a manufacturer provides a quality insurance policy, and the hot rolled plain steel bars are put into use after each batch is inspected again to be qualified at the time of being less than or equal to 60t after entering a factory;
hot-rolled ribbed steel bars for concrete are provided by manufacturers, quality insurance policies are provided, the hot-rolled ribbed steel bars are put into use after each batch is not more than 60t and qualified after being re-tested, and welded steel bars are put into use after being re-tested and qualified according to not more than 300 joints in each batch;
the technical indexes of the anchorage device meet the regulations of the standard JT/T329-2010 of the department of transportation, 10 percent of the anchorage device is tested in the same acceptance batch, no less than 10 sets of anchorage device are tested for appearance and size, and the anchorage device can be used after being qualified;
the clamping pieces are made of 20 chromium manganese steel with the hardness of 60-64 degrees, and the hardness test is carried out on 5 percent and not less than 5 sets of clamping pieces in the same acceptance batch, and the clamping pieces can be used after being qualified.
The construction machinery prepares, 1 set of reinforcing bar processing equipment, 1 of numerical control double-end steel bar bender, material test equipment is one set, 2 butt welders, 4 electric welders, 4 gas shielded arc welders, a plurality of portable bayonet vibrating machines, 4 sets of prestressing force tensioning equipment, 1 set of vacuum mud jacking equipment, 2 of 100T driving, 75T driving, 2 of 20T driving, 1 of high-pressure squirt, 2 of 1 cubic mixer, 2 reinforcing bar bed-jigs.
S1, manufacturing a bottom die, namely transversely paving 16-number channel steel with the same width as the box bottom on the basis of an original foundation concrete surface layer (the surface layer is made of a steel plate with the thickness of 1 cm), and paving 16-number channel steel on the transversely paved 16-number channel steel with the same width as the box bottom at intervals of 30cm longitudinally to form the bottom die;
s2, manufacturing the steel bars, arranging a net protective layer with the thickness not less than 35mm on the surfaces of the steel bars to keep the surfaces of the steel bars clean and straight, configuring a shaping jig frame in a precast beam yard, and integrally manufacturing the steel bar framework;
before installing the reinforcing steel bars, marking a central line on the bottom die, and arranging and installing the reinforcing steel bars from the central line to two sides according to the size of a construction drawing;
s3, manufacturing corrugated pipes, arranging groined positioning ribs of the corrugated pipes, arranging one linear section at intervals of 1m, arranging one curved section at intervals of 50cm, penetrating the corrugated pipes, connecting joints by adopting a hot melting process, closely attaching end molds to side molds and bottom molds to ensure the accuracy of reserved hole positions, and enabling the end molds to be perpendicular to the axis of the hole, marking coordinate positions at the fixed positions of the hole pipes, numbering anchor backing plates so that steel strands can be arranged in a number-to-number seat, penetrating plastic hoses which are 1cm smaller than the inner diameter of the corrugated pipes into the corrugated pipes before pouring, drawing out the plastic hoses in time after initial setting of concrete, tightly hooping the corrugated pipes around the corrugated pipes by using construction ribs at intervals of 50cm, and properly encrypting the bending sections according to construction requirements;
s4, template manufacturing, wherein the outer membrane adopts a standardized integral steel template, the thickness of the steel plate is not less than 8mm, each set of template is provided with a corresponding wedge block template for adjustment, the length of each independent steel plate is 6 meters, the connection between each steel plate is fixed by a positioning pin, then a bolt fastening method is adopted, the bottom of each independent steel plate is supported by a landing method, the inner mold adopts a two-end drawing method after the concrete reaches certain strength, an anchor backing plate is one of main stress devices for transferring tensile force to a beam body, the anchor backing plate is vertical to a steel bundle during positioning and is fixed by a constructional rib, so that the anchor backing plate, the steel template and a steel reinforcement framework are integrated, force transfer is facilitated, and positioning and fixing are realized;
arranging 2 phi 100mm round holes in the middle of the bottom of each inner mold for exhausting, observing that bottom plate concrete overflows when the bottom plate concrete is poured, then entering the round holes in the bottom surface of the closed inner mold from a window when the concrete is to be poured, arranging a crossbeam made of No. 30 channel steel on top layer steel bars every 60cm after the inner molds are installed in place and connecting with an outer membrane, welding two phi 32mm steel bars in the middle to clamp the top surface of the inner mold, and finally pressing a mold beam by adopting 50 x 250cm concrete blocks;
s5, stirring concrete, covering the top of the post after pouring and tamping by geotextile or plastic cloth, properly watering, properly prolonging the time for removing the formwork so as to avoid cracking the surface of the concrete and damaging the surface and edges and corners of the concrete, vibrating by a vibrating rod with the diameter of 30-50 during pouring and tamping, slightly vibrating the parts capable of being mechanically vibrated according to the regulations, knocking the side mould by a wooden hammer and assisting the vibration by reinforcing steel bars at the parts which can not be reached by the vibrating rod, finishing the stirring and pouring of the concrete within 2 hours, forbidding the pouring in rainy weather, observing an outer membrane and a support in the concrete pouring process, particularly the upward floating condition of the inner mould, helping to eliminate air bubbles in the concrete, preventing the concrete from being separated due to excessive vibration, and forbidding the pouring in rainy weather for ensuring the quality of the concrete and preventing the concrete from being separated;
in order to avoid the beam wall from being out of tolerance, the following measures are taken:
firstly, before feeding materials around an inner mold, a temporary wood inserting rod is used for tightly inserting the inner mold except for binding a concrete protective layer cushion block, so that the inner mold is fixed, and a vibrating rod of an inserted vibrator cannot be directly contacted with a template, thereby reducing the vibration of the template;
secondly, by adopting a 'multiple feeding' method, each layer of concrete mixture is not more than 30cm, and naturally descends along a longitudinal steep slope, so that the extrusion force on two sides of the internal mold is uniform;
s6, bundling, namely, penetrating the steel grain wires which are woven into a bundle into the holes by taking phi 6 steel bars as leads, reserving working lengths of 70cm at two ends respectively, and taking measures of preventing corrosion such as covering and wrapping plastic cloth for protecting the prestressed steel strand raw materials and the tensioned pipeline;
s7, tensioning, namely tensioning the prestressed steel beams when the concrete strength reaches the design specified value and the age requirement;
the method comprises the steps of adopting synchronous tensioning methods at two ends of an intelligent tensioning machine to perform tensioning, performing tensioning stress and elongation correction calculation according to the actually measured elastic modulus of a steel strand during tensioning, suspending tensioning when the actual elongation of a prestressed strand is more than 6% of the error of the actual elongation of the prestressed strand with a calculated value, finding reasons and taking measures to adjust, then continuing tensioning, responding to a vertical axis of a section of a member according to the drawing design requirement of the prestressed strand tensioning sequence, considering that the concrete stress at the upper edge and the lower edge of the member does not exceed an allowable value, seeing whether the wire breakage and wire sliding conditions are within a specified requirement range after one strand is pulled, re-threading and tensioning if the actual elongation of the prestressed strand exceeds the specification, performing tensioning after the control force of the prestressed strand is stable, cutting off redundant steel strands at the end by using a grinding wheel machine, protecting an anchorage by using concrete, and taking measures for preventing corrosion when the anchorage needs to be exposed for a long time;
the tensioned steel bundle seals the gaps of the steel bundles around the anchor plug tightly in time through cement paste;
s8, pulping, wherein after the prestressed tendon is tensioned, the pore canal is pressed to be grouted as early as possible, grouting is generally finished within 24 hours, the grouting equipment adopts vacuum grouting equipment, when the air temperature in the grouting process and 2 days after grouting is lower than 5 ℃, grouting operation is prohibited under the condition of no reliable heat preservation measures and is continuously carried out, waste slurry is discharged from the outlet of the vacuum grouting equipment until the waste slurry without water foam gas is discharged, the consistency of the waste slurry is the same as that of the grouting, the vacuum grouting equipment is thoroughly cleaned by clean water at least every three hours in the grouting operation, and the vacuum grouting equipment is cleaned once after the use of each day;
after grouting, immediately washing the cement at the beam end, simultaneously removing dirt on a supporting base plate, an anchorage device and end face concrete to prepare for pouring anchor sealing concrete, checking the length of the beam after anchor sealing and erecting a mould, carefully operating and carefully inserting the anchor sealing concrete to compact the concrete at the anchorage device, standing for 1-2 hours after anchor sealing concrete is poured, watering and curing with a mould, after demoulding, watering and curing at normal temperature for not less than 7 days, not watering and curing when the temperature is lower than 5 ℃ in winter, prolonging the curing time, taking heat preservation measures, installing automatic spray curing measures to perform curing, covering the bottom of the beam with geotextile, and keeping enough humidity and temperature;
after the beam prefabrication was accomplished, mark beam piece number on each beam piece, all mark in one side of big, little mileage end portion of each beam piece web side, specifically have: firstly, marking pile numbers, serial numbers, manufacturing dates, construction units and supervision unit names;
secondly, marking the serial number of the beam piece, and respectively weaving the serial number of the beam piece from the right side to the first beam piece from the left side according to the left pair and the right pair along the mileage increasing direction of the route;
and (3) retaining the box girder: 150 x 150mm3The 28-day standard curing concrete compressive strength test blocks are 2 groups, and the same condition curing test blocks are 3 groups, so that the concrete compressive strength test blocks can be conveniently used for detaching the inner mold and tensioning.
During the pore canal grouting, 4 groups of 70.7X 70.7mm should be reserved for each working class3The 28-day age standard curing compressive strength test blocks are 2 groups of the same curing test blocks under the same conditions, so that the cement paste quality of the test blocks is checked during component testing.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A concrete simply supported small box girder road butt joint construction process is characterized in that: the method comprises the following steps:
s1, manufacturing a bottom die, namely transversely paving 16-number channel steel with the same width as the box bottom on the basis of an original foundation concrete surface layer (the surface layer is made of a steel plate with the thickness of 1 cm), and paving 16-number channel steel on the transversely paved 16-number channel steel with the same width as the box bottom at intervals of 30cm longitudinally to form the bottom die;
s2, manufacturing steel bars, configuring a shaping jig frame in a precast beam field, and integrally manufacturing a steel bar framework;
before installing the reinforcing steel bars, marking a central line on the bottom die, and arranging and installing the bottom die from the central line to two sides according to the size of a construction drawing;
s3, manufacturing a corrugated pipe, arranging the positioning ribs in a # -shape of the corrugated pipe, arranging one linear section at intervals of 1m and one curved section at intervals of 50cm, penetrating the corrugated pipe, and connecting joints by adopting a hot melting process;
s4, template manufacturing, wherein the outer membrane is a standardized integral steel template, the thickness of a steel plate is not less than 8mm, each set of template is provided with a corresponding wedge block template for adjustment, the length of each independent steel plate is 6 meters, the connection between the steel plates is fixed by a positioning pin and then supported by a bolt fastening method, the bottom of the steel plate is supported by a landing method, and the inner mold is supported by a two-end drawing method after the concrete reaches certain strength;
arranging 2 phi 100mm round holes in the middle of the bottom of each internal mold for exhausting, observing that bottom plate concrete overflows when the bottom plate concrete is poured, then entering the round holes on the bottom surface of the closed internal mold from a window when the concrete is to be poured, arranging a crossbeam made of No. 30 channel steel on top layer steel bars every 60cm after the internal molds are installed in place and connecting with an external membrane, welding two phi 32mm steel bars in the middle to clamp the top surface of the internal mold, and finally pressing a mold beam by adopting a 50 x 250cm concrete block;
s5, stirring concrete, covering the top of the post by geotextile or plastic cloth after pouring and tamping, watering at regular time, and prolonging the form removal time according to specific conditions;
s6, bundling, namely, enabling the steel wire which is woven into a bundle to penetrate into the hole by taking a phi 6 steel bar as a lead wire, and reserving working lengths of 70cm at two ends respectively;
s7, tensioning, namely tensioning the prestressed steel beams when the concrete strength reaches the design specified value and the age requirement;
adopting a synchronous stretching method at two ends of an intelligent stretching machine to stretch, and performing stretching stress and elongation correction calculation according to the actually measured elastic modulus of the steel strand during stretching;
s8, pulping, wherein after the prestressed tendons are tensioned, the pore passages are pressed to be grouted as early as possible, and grouting equipment adopts vacuum grouting equipment after grouting is finished within 24 hours generally;
after grouting, the cement at the beam end is washed clean, and simultaneously, dirt of a supporting base plate, an anchorage device and end face concrete is removed so as to prepare for pouring anchor sealing concrete, the beam length is checked after the anchor sealing and erecting die, and the anchor sealing concrete is carefully operated and carefully inserted and tamped so that the concrete at the anchorage device is compact.
2. The concrete simply supported small box girder road butt joint construction process according to claim 1, characterized in that: in S3, for guaranteeing the accuracy of reservation pore position, the end mould closely laminates with side form and die block to perpendicular with the pore axis, the anchor backing plate serial number is so that steel strand wires arrange the number of registering and is gone into the seat, the bellows penetrates the plastic hose that is less than the bellows internal diameter 1cm before pouring, plastic hose in time takes out after the concrete initial set, the effective structure muscle of bellows is according to every interval 50cm a shelves and is carried out the lock ring with its week, and the section of starting to bend is according to the construction needs suitably encryption.
3. The concrete simply supported small box girder road butt joint construction process according to claim 1, characterized in that: in the S4, the anchor backing plate is one of main stress devices for transmitting tensile force to the beam body, and the anchor backing plate is vertical to the steel bundle and is fixed by the constructional bar during positioning, so that the anchor backing plate, the steel template and the steel reinforcement framework are integrated.
4. The concrete simply supported small box girder road butt joint construction process according to claim 1, characterized in that: in the step S5, the concrete surface is prevented from cracking and being damaged, the concrete surface and edges and corners are prevented from being damaged, a vibrating rod with the diameter of 30-50 is adopted for vibrating during pouring, the parts capable of being mechanically vibrated are slightly vibrated according to the rule, the parts which cannot be reached by the vibrating rod can be knocked by a wooden hammer and vibrated by a reinforcing steel bar in an auxiliary mode, the concrete is stirred to be poured within 2 hours, pouring is forbidden in rainy days, and in the concrete pouring process, the outer membrane, the support and the floating condition of the inner membrane are observed.
5. The concrete simply supported small box girder road butt joint construction process according to claim 1, characterized in that: in the step S7, when the error between the actual elongation of the tendon and the calculated value exceeds 6%, the tensioning is suspended, and the tensioning can be continued after the reason is found and measures are taken to adjust.
6. The concrete simply supported small box girder road butt joint construction process according to claim 5, characterized in that: the tensioning sequence of the prestressed steel bundles is designed according to a drawing, is symmetrical to the vertical axis of the section of the member, simultaneously considers that the concrete stress at the upper edge and the lower edge of the member does not exceed an allowable value, and after one bundle is pulled, whether the conditions of wire breakage and wire sliding are within a specified requirement range is judged, and when the conditions exceed the specification, the bundle is pulled again, the prestressed steel strands are anchored after the tensioning control force reaches stability, and redundant steel strands at the end are cut off by using a grinding wheel machine.
7. The concrete simply supported small box girder road butt joint construction process according to claim 5, characterized in that: and the tensioned steel bundle timely and tightly seals the gaps of the steel bundles around the anchor plug through cement paste.
8. The concrete simply supported small box girder road butt joint construction process according to claim 1, characterized in that: and in the S8, when the air temperature is lower than 5 ℃ in the grouting process and 2 days after grouting, the grouting operation is prohibited under the condition of no reliable heat preservation measure and is continuously carried out, and the waste pulp is discharged from the outlet of the vacuum grouting equipment until the waste pulp without the foam gas is discharged, and the process is stopped when the consistency of the waste pulp is the same as that of the grouting.
9. The concrete simply supported small box girder road butt joint construction process according to claim 8, characterized in that: the vacuum grouting equipment is thoroughly cleaned by clean water at least once every three hours in grouting operation and also cleaned once after use every day.
10. The concrete simply supported small box girder road butt joint construction process according to claim 9, characterized in that: the anchor sealing concrete is kept stand for 1-2 hours after being poured, watering and curing are carried out with a mold, after demolding, watering and curing time is not less than 7 days generally at normal temperature, watering and curing are not carried out when the temperature is lower than 5 ℃ in winter, curing time is prolonged, heat preservation measures are adopted, automatic spraying and curing measures can be installed for curing, geotextile is used for covering the bottom of the beam, and enough humidity and temperature are kept.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110625728.3A CN113481795A (en) | 2021-06-04 | 2021-06-04 | Concrete simply-supported small box girder road butt joint construction process |
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| CN202110625728.3A CN113481795A (en) | 2021-06-04 | 2021-06-04 | Concrete simply-supported small box girder road butt joint construction process |
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| CN113481795A true CN113481795A (en) | 2021-10-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704095A (en) * | 2022-04-15 | 2022-07-05 | 濮阳市宏超建筑安装有限公司 | Continuous casting equipment and method for reinforcement cage concrete pipe in building |
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2021
- 2021-06-04 CN CN202110625728.3A patent/CN113481795A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704095A (en) * | 2022-04-15 | 2022-07-05 | 濮阳市宏超建筑安装有限公司 | Continuous casting equipment and method for reinforcement cage concrete pipe in building |
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Application publication date: 20211008 |