CN113005902A - Grouting sleeve connection type capping beam integral prefabrication construction process - Google Patents
Grouting sleeve connection type capping beam integral prefabrication construction process Download PDFInfo
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- CN113005902A CN113005902A CN202110174670.5A CN202110174670A CN113005902A CN 113005902 A CN113005902 A CN 113005902A CN 202110174670 A CN202110174670 A CN 202110174670A CN 113005902 A CN113005902 A CN 113005902A
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
- E01D19/00—Structural or constructional details of bridges
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Abstract
The invention provides a grouting sleeve connection type capping beam integral prefabrication construction process, which comprises the following steps: step 1: arranging a processing area; step 2: processing a corrugated steel pipe sleeve connector; and step 3: installing a cover beam steel bar; and 4, step 4: prefabricating and mounting a cover beam inner stop block; and 5: prefabricating an outer baffle; step 6: installing a main template of the cover beam and pouring concrete of the main cover beam; and 7: constructing a ridge beam; and 8: constructing a steel strand; and step 9: compared with the prior art, the prestressed tensioning and grouting device has the following beneficial effects: quickening the construction progress, improving the engineering quality and reducing the environmental pollution.
Description
Technical Field
The invention relates to a grouting sleeve connection type capping beam integral prefabrication construction process, belonging to the field of highway engineering.
Background
In recent years, with the soaring development of economy, traffic becomes an important link for promoting the development, wherein a road bridge plays an extremely important role, a road traffic network is greatly improved, the traffic transport capacity is improved, the social and economic development is promoted, and great convenience is brought to the mass traffic participants. However, the road bridge has many problems and limitations in the construction process while promoting economic development. For example, the energy and resource consumption is too large, and the waste is serious; environmental and noise pollution exists in the construction process; the construction causes unsmooth traffic, and influences the normal life of nearby residents; the construction period and the construction period are too long, and the machine is repeatedly used, so that the profit is reduced; the accidental object falling on site is difficult to avoid, and the risk of construction safety accidents is high. Particularly, in the construction environment with limited construction site and severe meteorological conditions, the problems of high difficulty in concrete on-site pouring, difficulty in ensuring construction quality and safety and the like exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a grouting sleeve connection type capping beam integral prefabricating construction process so as to solve the problems in the background technology.
In order to achieve the purpose, the invention is realized by the following technical scheme: the grouting sleeve connection type capping beam integral prefabrication construction process comprises the following steps:
step 1: arranging a processing area;
step 2: processing a corrugated steel pipe sleeve connector;
and step 3: installing a cover beam steel bar;
and 4, step 4: prefabricating and mounting a cover beam inner stop block;
and 5: prefabricating an outer baffle;
step 6: installing a main template of the cover beam and pouring concrete of the main cover beam;
and 7: constructing a ridge beam;
and 8: constructing a steel strand;
and step 9: and (5) prestress tensioning and grouting.
Further, in the step 1, the processing and manufacturing of the bent cap steel bars are carried out in a standardized factory, the overall layout is divided into a steel bar processing area, a steel bar cage temporary stacking area, a steel bar cage die-filling and die-closing area, a pouring area and a finished product stacking area, the five areas are sequentially arranged to form flow line operation without mutual influence, a loading space and a transportation channel are reserved in the stacking area, and the bent cap steel bar processing jig frame is manufactured in the steel bar processing area.
Further, in the step 2, the processing of the corrugated steel pipe sleeve connector comprises processing of a positioning frame, processing of a corrugated steel pipe sleeve and installation of the corrugated steel pipe sleeve.
Further, in the step 3, the cover beam steel bar installation comprises steel bar blanking bending, steel bar installation, prestressed pipeline installation, lifting and stacking.
Further, in the step 4, the width of the single bent cap is 12.5m, four beam plates are designed to be erected, the edges of two middle beams are respectively provided with an inner stop block, the inner stop blocks adopt a prefabrication installation mode, when the whole reinforcing steel bars of the bent cap are manufactured, the prefabricated inner stop blocks are installed on the reinforcing steel bar framework, and the prefabrication installation of the inner stop blocks of the bent cap comprises prefabrication of the inner stop blocks, installation of the inner stop blocks and setting of a hanging point.
Further, in step 5, bent cap outer stop adopts independent prefabrication processing to assemble construction technology, compares with traditional on-the-spot processing technology, when guaranteeing the outward appearance quality, also can be better control the process that the bent cap end easily exists the quality problem, outer baffle prefabrication includes outer baffle reinforcing bar processing, anchor tackle notch installation and fixed, rings setting and concrete placement, maintenance, chisel hair.
Further, in the step 6, the installation of the capping beam template and the pouring of the concrete are completed in two times, the installation of the main body side die and the pouring of the concrete are performed for the first time, the installation of the ridge beam side die and the pouring of the concrete are performed for the second time, the installation of the capping beam main body template comprises the assembly of the capping beam prefabricating pedestal and the main body template and the entering of the steel reinforcement framework, and the assembly of the main body template and the entering of the steel reinforcement framework comprises the assembly of a bottom die, the entering of a steel reinforcement cage, the assembly of an outer baffle and the installation.
Further, in the step 7, the ridge beam construction includes concrete pouring of the body cover beam, installation of the side die of the ridge beam and concrete pouring of the ridge beam.
Further, in the step 8, before the steel strand construction, the concrete is cured, and the steel strand adopts a back-threading method.
Further, in the step 9, the prestress tensioning and grouting comprises prestress tensioning, pipeline grouting and notch sealing.
The invention has the beneficial effects that:
1. the construction progress is accelerated, the prefabrication construction method is that when the bridge bearing platform and the pier stud are constructed, the capping beam construction can be processed and manufactured, even the processing and manufacturing are finished, the capping beam can be hoisted immediately after the pier stud is installed, and the capping beam construction can be finished next day.
2. The construction method has the advantages that the engineering quality is improved, the cover beam is cast in place, adverse factors such as high construction space, sporadic processing of reinforcing steel bars and uneven settlement easily generated during support erection due to the limitation of site construction conditions cause difficulty in controlling the cast quality of site concrete, the cover beam is prefabricated, the bottom die is directly laid on the site, the side die is simply installed, the reinforcing steel bars are integrally processed and formed, tensioning is performed on the site ground, the construction conditions are good, and the quality is easy to control.
3. The environmental pollution is reduced, the number of constructors and machines in a construction site is small, the steel bars and the concrete are poured in a factory, and the environmental pollution to the construction site is greatly reduced.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The invention provides a technical scheme that: the grouting sleeve connection type capping beam integral prefabrication construction process comprises the following steps:
step 1: arranging a processing area;
step 2: processing a corrugated steel pipe sleeve connector;
and step 3: installing a cover beam steel bar;
and 4, step 4: prefabricating and mounting a cover beam inner stop block;
and 5: prefabricating an outer baffle;
step 6: installing a main template of the cover beam and pouring concrete of the main cover beam;
and 7: constructing a ridge beam;
and 8: constructing a steel strand;
and step 9: and (5) prestress tensioning and grouting.
In the step 1, the processing and manufacturing of the cover beam steel bars are carried out in a standardized factory, the overall layout is divided into a steel bar processing area, a steel bar cage temporary stacking area, a steel bar cage die-entering and die-closing area, a pouring area and a finished product stacking area, the five areas are sequentially arranged to form flow line operation without mutual influence, a loading space and a transportation channel are reserved in the stacking area, and the cover beam steel bar processing jig frame is manufactured in the steel bar processing area.
The bed-jig is by the sleeve underframe frame, and a support, lacing film and locating rack constitute, reinforcing bar processing bed-jig is before assembling, each part to the bed-jig is tested and is retested, especially wave form steel pipe sleeve connector position needs the precision measurement, the process of assembling requires bed-jig base installation level, accuracy control is in 2mm, each support mounting requires the accurate state in position perpendicular, accuracy control is in 2mm, each support is guaranteed on same line to each support overall survey after the bed-jig installation is accomplished, produce the turn-round when preventing the installation of main muscle.
In the step 2, the processing of the corrugated steel pipe sleeve connector comprises the steps of processing a positioning frame, processing a corrugated steel pipe sleeve and installing the corrugated steel pipe sleeve.
Processing a positioning frame: the positioning frame, the upright positioning plate, the positioning frame and the bearing platform positioning frame are processed together and manufactured by the same manufacturer, the punching positions, the punching quantity and the punching intervals of the positioning frame correspond to those of the pre-buried steel bars of the design drawing, and the deviation value of the hole intervals is smaller than 2 mm.
Processing the corrugated steel pipe sleeve: laying section steel on a flat ground, placing a positioning frame on the section steel, vertically installing a corrugated steel pipe sleeve, adjusting the interval and the verticality of the corrugated steel pipe sleeve to meet the requirements, welding angle steel on the inner sides of the positions of 20cm at the upper end and the lower end of the corrugated steel pipe sleeve respectively after the interval and the verticality reach the requirements, welding all the corrugated steel pipe sleeves and the angle steel into a fixed body, welding all the corrugated steel pipe sleeves into a shape by using stirrups and tie bars after the corrugated steel pipe sleeve is adjusted to be vertical, finally dismantling the upper end and the lower end positioning frames, covering the upper opening of the corrugated steel pipe sleeve by using a fixed iron sheet, placing the integral sleeve framework at a hoisting position, installing a slurry inlet pipe and a slurry outlet pipe, wherein the slurry inlet pipe and the slurry outlet pipe adopt a quarter-bend white iron pipe, the mortar inlet pipe is arranged on the lower layer, the mortar outlet pipe is arranged on the upper layer, and the mortar inlet pipe and the mortar outlet pipe are symmetrically arranged up and down.
Installing a corrugated steel pipe sleeve: arranging a positioning frame at the position of a fixed corrugated steel pipe sleeve on a steel bar processing jig frame, accurately rechecking the position of the positioning frame and the position of a sleeve mounting point, wherein the deviation value does not exceed 2mm, respectively mounting a bottom plug at the position of the sleeve corresponding to the four corners of the positioning frame, hoisting an integral sleeve framework to the positioning frame by using a gantry crane in a factory, detecting the verticality of each corrugated steel pipe sleeve by using a guiding ruler, ensuring that each corrugated steel pipe sleeve is vertical to a bottom template, starting to mount a grout inlet and outlet grout stop plug after the corrugated steel pipe sleeves are adjusted in place, processing a hoop reinforcement of an encryption sleeve and a cover beam reinforcement, sealing the joint of the bottom end of the corrugated steel pipe sleeve and a positioning plate by using glass cement before the sleeve framework is mounted for adjusting the position and the verticality of the corrugated steel pipe sleeve, reducing the installation quantity of the hoop reinforcement, increasing the spacing, accurately positioning the corrugated steel pipe sleeves on the jig frame, encrypting the hoop reinforcement of the hoop reinforcement sleeve, and cement paste is prevented from entering the corrugated steel pipe sleeve to block the corrugated steel pipe sleeve for grouting in the future concrete pouring process.
In the step 3, the cover beam steel bar installation comprises steel bar blanking bending, steel bar installation, prestressed pipeline installation and lifting stacking.
Blanking and bending the reinforcing steel bar: in order to ensure the accuracy of processing the reinforcing steel bars and control the positioning deviation value of the reinforcing steel bars to be 5mm, all reinforcing steel bar blanking bends are processed by an intelligent large numerical control machine, and the blanked semi-finished reinforcing steel bars are marked and neatly stacked.
And (3) steel bar installation: what the bent cap adopted is the form of falling T, and above-mentioned one section is bent cap spine, and the installation of corrugated steel pipe sleeve is accomplished the back, ligature bent cap reinforcing bar, and bent cap steel bar installation should be noted and avoid corrugated steel pipe sleeve, must not cause the disturbance to its position to influence corrugated steel pipe sleeve's accurate position, cause the bent cap to assemble from now on with the pre-buried reinforcing bar dislocation of stand, reinforcing bar installation order: the bent-wire binding device comprises a cover beam top, a spine beam top main rib → a spine beam end stirrup → a cover beam bottom main rib → a spine beam residual stirrup, and steel bars are machined to be accurate in position and straight, the stirrups are accurate in position and even in distance, welding is conducted to check relevant standard requirements, binding is firm, binding wires are bent inwards, and the distance deviation of the steel bars is strictly controlled within 5 mm.
Mounting a prestressed pipeline: in the bent cap steel bar framework, a metal corrugated pipe is installed to serve as a prestressed pipeline, fixed points are firstly carried out according to the pipeline coordinate position of a design drawing, the distance between every two points is 50cm, then the metal corrugated pipe penetrates through the fixed point position, a frame is arranged at each fixed point position to fix the metal corrugated pipe, the pipeline after installation is subjected to coordinate retest, the deviation value is controlled within 5mm, when the metal corrugated pipe collides with the steel bar position, the steel bar position is properly adjusted, the line shape of the metal corrugated pipe is ensured, the prestress loss is reduced, in the prestressed pipeline installation process, the position of an end notch and the pipeline coordinate of a fluctuation point are strictly controlled, fixed points and positioning are carried out according to the drawing requirements, the distance between the pipe and the pipe center is strictly controlled, a prestress bundle adopts a steel strand rear penetrating method, and the influence of concrete grout on the.
After the construction of the bent cap steel reinforcement framework, the corrugated steel pipe sleeve and the prestressed pipeline is completed, the steel reinforcement framework is lifted by a gantry crane in a factory and transported to a specified stacking area, the upper surface of the bent cap steel reinforcement framework is heightened by cushion blocks, and auxiliary installation such as lifting points and inner check blocks is carried out in the stacking area.
In step 4, the single bent cap is 12.5m wide and is designed to be erected with four beam plates, the edges of the two middle beams are respectively provided with an inner stop block, the inner stop blocks adopt a prefabrication installation mode, when the whole reinforcing steel bar of the bent cap is manufactured, the prefabricated inner stop blocks are installed on the reinforcing steel bar framework, and the prefabrication installation of the inner stop blocks of the bent cap comprises prefabrication of the inner stop blocks, installation of the inner stop blocks and setting of lifting points.
Prefabricating an inner stop block:
manufacturing an inner stop block steel reinforcement framework: according to the design drawing, the inner stop block steel reinforcement framework is manufactured, and the formed steel reinforcement framework is orderly stacked.
Inner block concrete formwork: installation design drawing carries out steel form processing, because interior dog is small, once only can carry out many concrete placement, so adopt bar steel form, middle interval.
Concrete pouring of the inner stop block: high-performance concrete is poured, the concrete strength is consistent with that of the cover beam, a steel bar lifting point is installed before the concrete is poured for facilitating the hoisting of the inner stop block, and the concrete is maintained, demolded and temporarily stacked after the concrete is poured.
And (3) installing an inner stop block: adopt the interior portal crane of factory with prefabricated interior dog handling to bent cap steel reinforcement skeleton on, interior dog reservation goes deep into bent cap steel reinforcement skeleton, then according to the position measurement location of design drawing, then will insert reinforcing bar and bent cap reinforcing bar and weld, the interior dog position is fixed a point according to the drawing requirement to interior dog position before the installation, carries out suitable adjustment to the stirrup rather than conflicting, avoids interior dog off normal or the stirrup to cut off the condition to appear.
Setting a lifting point: the hoisting point is set at a position which needs to meet the requirements of stability and balance in the process of hoisting or running of the bent cap, the load bearing needs to meet the hoisting requirements, the hoisting point adopts phi S15.2mm, Ep =1.95 × 105 low-relaxation steel stranded wires, the single-strand load bearing is 19.5t, 4 strands are in a group, 16 strands are divided into 4 groups, the steel stranded wires are uniformly arranged at a position which is 30cm away from the inner side of the inner stop block, the upper end of the hoisting point adopts a galvanized sleeve as a hoisting contact point, the length of the embedded concrete is 1.1m, the lower end of the hoisting point adopts an anchor plate and a P anchor with corresponding specification models for anchoring, and the construction process of the prestress P anchor is utilized to play the special performance.
In step 5, the bent cap outer stop block adopts the independent prefabrication processing and assembling construction process, and compared with the traditional field processing process, the outer quality is guaranteed, meanwhile, the process of easily existing quality problems at the bent cap end can be well controlled, and the prefabrication of the outer baffle comprises the steps of outer baffle steel bar processing, anchorage device notch installation and fixation, hanging ring setting and concrete pouring, maintenance and roughening.
Processing the reinforcing steel bars of the outer baffle: processing according to the design drawing external dog reinforcing bar, and reserve the reinforcing bar of deepening bent cap main part steel bar skeleton part, the reservation position is reserved according to the position of design drawing, reservation length is reserved according to the steel bar welding standard requirement, guarantee welding length, during reinforcement, outer baffle upper and lower end owner muscle adopts the fixed beam forming of two main muscle, it is fixed to correspond welded connection with bent cap owner muscle when convenient outer baffle hoist and mount, when guaranteeing fixed firm, the main muscle position of protection that also can be fine does not produce the aversion change.
The anchorage device notch is installed and fixed: the stretching anchorage device adopts a concrete surface invagination type, a plastic sleeve is sleeved outside the anchorage device, the sleeve and the anchorage device are sealed by sealant, slurry is prevented from overflowing during concrete construction, spiral steel bars are installed at the notch position of the anchorage device after an outer baffle steel bar is processed and filled into a die, and the notch of the anchorage device is fixedly installed on the spiral steel bars.
The rings are arranged: in order to facilitate the lifting during the assembly of the outer baffle, 4 nuts with the diameter of 50mm are installed in concrete on the side surface of the outer baffle, 2 nuts are arranged on each side surface, threads are turned on the inner wall of each nut and matched with the bolts, the outer openings of the nuts are flush with the steel templates, after the pouring and the removal of the mold are completed, the threaded lifting rings are screwed up to be used as lifting points for the assembly of the outer baffle, and the lifting rings are withdrawn after the assembly of the outer baffle is in place and are used as bolt holes for the subsequent assembly with the side mold.
Pouring concrete, maintaining and chiseling: reinforcing bar, the ground tackle, after the installation such as rings built-in fitting is accomplished, carry out the steel form and assemble, then pour high performance concrete, receive the light, grind the tie, demolish the steel form after outer baffle concrete strength reaches a definite value, the maintenance of watering, the concrete of external dog and bent cap main part faying face department is dug mao, adopt dedicated handheld type chisel hair ware chisel hair, the chisel removes concrete surface thick liquid, expose the aggregate, when handheld type chisel hair ware convenient operation, can be better reach the chisel hair effect, improve chisel hair efficiency and chisel hair quality.
In the step 6, the installation of the cover beam template and the concrete pouring are completed in two times, the installation of the main body side die and the concrete pouring are performed for the first time, the installation of the ridge beam side die and the concrete pouring are performed for the second time, the installation of the cover beam main body template comprises the assembly of the cover beam prefabricating pedestal and the main body template and the insertion of the steel reinforcement framework, and the assembly of the main body template and the insertion of the steel reinforcement framework comprise the assembly of a bottom die, the insertion of a steel reinforcement cage, the assembly of an outer baffle and the installation and the fixation.
And (3) prefabricating a pedestal by using a cover beam: pedestal foundation needs to be handled earlier, there is sufficient bearing capacity, the settlement deformation of foundation should satisfy the prefabricated requirement of bent cap, the foundation is handled and can be adopted the mode that pile and pouring foundation concrete combine, the prefabricated place sets up the prefabricated pedestal of bent cap, the pedestal adopts concrete rectangle pedestal, the pedestal height is 0.3m, pedestal plane dimension should satisfy the bent cap preparation of every specification model, pedestal top surface roughness should satisfy the template and assemble the requirement, set up 2 rows "L" type location steel baffle on the concrete pedestal, the length of baffle is the same with bent cap length, the baffle interval is bent cap width and both sides side form bottom shaped steel width sum, adopt the inflation screw fixation between baffle and the foundation concrete.
Bottom die assembly: the die block is assembled and is divided two steps and go on, and the straight section of carrying on earlier takes one's place fixedly, carries out both ends oblique angle die block again and assembles, and bent cap template die block adopts the combination steel form, and the steel form panel adopts 8 mm's high-quality steel sheet, defects such as surface rust-free, indentation, deviation when the steel form preparation: allowable deflection of plate surface and plate side: +/-1 mm, controlling the flatness of the surface of the steel template to be 1.0mm, derusting, polishing and polishing the surface of the steel template, wherein the polishing standard is smooth hand feeling and no wave feeling until the mirror effect is achieved, a release agent is coated after the steel template is polished, the release agent can be hydraulic oil or template paint, waste engine oil is strictly forbidden, the release agent is uniformly coated, the using amount is as small as possible, and the finish polishing is only required.
The bent cap bottom die is divided into three sections, one end of the middle of the bent cap bottom die is a straight section, two sides of the bent cap bottom die are oblique angle sections, the sleeve positioning plate connecting positions are reserved in the straight section bottom die, positioning pin holes are formed in two sides of the straight section bottom die, and a 'male head' is arranged on a template of the oblique angle section. Firstly, flatly placing three sections of steel templates on a pedestal, then hoisting oblique angle sections by using a gantry crane to slowly move to the straight section of templates, splicing the male heads of the templates to the holes of the straight section of templates, inserting positioning pins into the holes of the two sections of templates to connect the templates, after the three sections of the bottom die of the cover beam are spliced, fixing a sleeve positioning plate on the bottom die at the straight end, wherein the positioning plate is connected with the bottom die by bolts, a bottom plug is respectively arranged at the four corners of the positioning plate, then fixing steel plates with the thickness of 8mm at two joints, measuring and checking the bottom die, the surface of the steel plates at the joints and the surface of the bottom die are smooth, the flatness is controlled within 2mm, measuring the position of the sleeve, the deviation value is less than 2mm, splicing the three sections of bottom die is finished, after the checking is qualified, lifting the ends of the two sections of oblique angle bottom templates are fixed by using section steel, and after the bottom die assembly is completed, detecting and rechecking the straightness and included angle of each section of the template.
And (3) entering a reinforcing cage into a mold: after the bottom die is assembled, the steel reinforcement cage is hoisted into a die, the steel reinforcement cage is hoisted by adopting a specific hanger and a hook-unloading gantry crane in a matching plant to operate, the crane is kept to travel at a constant speed in the hoisting process of the steel reinforcement cage, the bottom die is subjected to oil coating treatment before the steel reinforcement cage is hoisted, the steel reinforcement cage is hoisted by adopting the gantry crane, a concrete protective layer cushion block of the bottom die is checked, if the concrete protective layer cushion block is insufficient, the steel reinforcement cage is additionally installed, the number of the cushion blocks is four per square meter, meanwhile, orifices at the bottom of the connecting sleeve and grouting pipes are checked, except sleeves at four corners, the orifices are subjected to sealing treatment, orifices of all the grouting pipes are completely sealed, when the steel reinforcement cage is inserted into the die, the four corners are slowly moved, and the sleeves of the sleeve.
Assembling outer baffles: the outer baffle is not only a part of the bent cap structure, but also serves as an end template for prefabricating the bent cap, an in-factory gantry crane is adopted, a hoisting chain is used for hooking the outer baffle to reserve a hoisting ring, then the outer baffle is hoisted to an assembling position, the outer baffle is slowly lowered and pushed to the bent cap reinforcement cage, after the bottom end of the outer baffle is closely attached to the bottom die in place, the gantry crane is clamped, reserved steel bars and bent cap steel bars are welded, a plug pad is arranged below the baffle, after connection of the reserved steel bars and the bent cap steel bars is completed, the stability and the angle size of the outer baffle are checked, and the hoisting ring is dismantled and the gantry crane is moved.
Installing and fixing a side die: after the steel bars are in place and the outer baffles are installed, hoisting the side die according to side lines, forming the steel die in large blocks by the side die, fixing end parts and the outer baffles at two ends of the installed side die by bolts after the side die is hoisted in place, reinforcing lower corners by using positioning baffles and steel wedges pre-embedded at two sides of the base, fixing the two side dies by adopting high-strength performance counter-pulling screws at positions 50cm away from an upper opening, and controlling upper and lower chamfers by adopting wooden triangular bars;
fixing the end part of the side die: when the outer baffle is prefabricated, connectors are respectively embedded at the upper part and the lower part, after the outer baffle is assembled, a hanging ring on each connector is detached, and the upper preformed hole and the lower preformed hole on the end part of the side mold correspond to the connector of the outer baffle in position and are screwed and fixed by bolts;
fixing the bottom of the side mold: the side die is fixed mainly by means of L-shaped angle steel pre-buried on the pedestal, a steel wedge is driven between the reinforced steel and the pre-buried angle steel at the bottom of the side die, and the bottom end of the side die is fixed.
In step 7, the ridge beam construction includes main body cover beam concrete pouring, ridge beam side mold installation and ridge beam concrete pouring.
Pouring concrete on the main body cover beam: the concrete pouring adopts high-performance and high-strength C60 self-compacting concrete pouring, the requirement of the expansion degree is not more than 550mm, the pouring adopts pumping or bucket pouring, the pouring is strictly carried out according to the elevation line during the pouring, the machine is protected during the pump pipe or bucket pouring, the influence on the cleanness of a construction site is reduced, the subsequent construction of the protection of the slurry inlet pipe and the slurry outlet pipe before the pouring mainly protects the slurry inlet pipe and the slurry outlet pipe to prevent blockage, after the capping beam concrete pouring is finished, the water filling of the slurry inlet pipe is immediately plugged by an air compressor to ensure the smoothness of the slurry inlet pipe and the slurry outlet pipe, and before the concrete pouring, a plastic lining pipe is penetrated in the prestressed corrugated pipe.
Installing a side die of a ridge beam: the method comprises the steps of reserving screw holes on side form reinforced section steel, fixing the bottom end and the top end of a side form by using counter-pull screws, conducting chiseling treatment on poured concrete on a junction surface of a ridge beam and a main body of a cover beam before the side form is installed, drawing a ridge beam edge line on the surface of the concrete after the main body of the cover beam is poured, placing the side form of the ridge beam by using a gantry crane in a factory, placing the side form plate according to the edge line position, pasting sealant on junction surfaces of the end part of the side form and an external stop block, and bonding surfaces of the bottom part of the side form and the poured concrete, preventing slurry leakage during concrete pouring, conducting retest and inspection after the side form is installed, retesting the width of the ridge beam, controlling deviation within 5mm, checking tightness degree of the counter-pull screws on and under the side form, and ensuring that the side form does not shift and expand during.
Pouring spine beam concrete: the concrete pouring adopts self-compacting pumped concrete with high performance and high strength C60.
In step 8, before the steel strand construction, curing the concrete by adopting a method of sprinkling and covering geotextile, wherein the curing time is not less than 7 days, the steel strand adopts a back-through method, before the concrete is poured, a prestressed pipeline penetrates into the lining pipe, after the concrete is initially set, the lining pipe is pulled out, then the prestressed pipe is cleaned, washed and dried, and then the steel strand is penetrated.
The steel strand back-threading method has the advantages that: the prestressed pipeline has the conditions of slurry seepage, pipeline deformation and the like, and can be cleaned and treated after the lining pipe is pulled out, and then the steel strand is threaded, so that the treatment is convenient.
In step 9, the prestress tensioning and grouting comprises prestress tensioning, pipeline grouting and notch sealing.
Pre-stress tension: the prestress tensioning is monitored by adopting an intelligent tensioning process and a control method of double control of control force and elongation, the tensioning is performed simultaneously and synchronously at two ends according to the tensioning sequence of firstly N2 and then N1, pore grouting needs to be performed within 48 hours after tensioning is completed, the steel strand at the end is cut by adopting a handheld grinder, the cutting surface is 3-4 cm away from the concrete of the outer stop block surface, and cement mortar is filled in the part of the steel strand exposed out of the anchorage device, but the grouting hole cannot be blocked.
Grouting the pipeline: the method comprises the steps of adopting serial-connection type grouting, serially connecting pipelines by using plastic rubber tubes containing steel wires, performing 2-4 bundles of simultaneous circulating grouting, wherein the grouting water-cement ratio is 0.28, the grouting material is special bagged grouting material, the use amount of water and the grouting material is strictly controlled every time the grouting material is mixed, the grouting efficiency can be improved while the grouting fullness is ensured, in the stirring process of the grout, the grouting material and the water are strictly weighed, the water-cement ratio is controlled, after thick grout is discharged, a grout outlet valve is closed, the load is kept for 2-3 min, and then a grouting opening is sealed.
Sealing the anchor at the notch: the stretching anchorage device adopts an inward-sinking type, a stretching anchorage device notch is arranged in outer block concrete, the notch is sealed by adopting a grouting method, compared with the traditional concrete sealing anchor, the appearance of the anchor is improved greatly in compactness and appearance quality, after stretching and grouting are finished, a screw cap on the port of an anchor backing plate in the notch is removed, one end of a screw rod with the same size is screwed and installed, the other end of the screw rod is provided with a small wood plug, the wood plug is connected with an exposed screw rod, a special round steel plate with the thickness of 8mm is adopted to completely seal the notch, the exposed screw rod penetrates through the round steel plate, the steel plate is screwed by the screw cap, the periphery of the steel plate is completely sealed by foam rubber, a grout outlet, a grout pressing port and two screw rod holes are arranged on the special round steel plate, after the round steel plate is installed, a grout outlet pipeline is installed on the grout outlet, after grouting is finished, the exposed screw rod is screwed down, the, the appearance quality and the internal quality of the anchor sealing concrete can be improved.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The grouting sleeve connection type capping beam integral prefabrication construction process is characterized by comprising the following steps of:
step 1: arranging a processing area;
step 2: processing a corrugated steel pipe sleeve connector;
and step 3: installing a cover beam steel bar;
and 4, step 4: prefabricating and mounting a cover beam inner stop block;
and 5: prefabricating an outer baffle;
step 6: installing a main template of the cover beam and pouring concrete of the main cover beam;
and 7: constructing a ridge beam;
and 8: constructing a steel strand;
and step 9: and (5) prestress tensioning and grouting.
2. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: in the step 1, the processing and manufacturing of the cover beam steel bars are carried out in a standardized factory, the overall layout is divided into a steel bar processing area, a steel bar cage temporary stacking area, a steel bar cage die-entering and die-closing area, a pouring area and a finished product stacking area, the five areas are sequentially arranged to form flow line operation without mutual influence, a loading space and a transportation channel are reserved in the stacking area, and the cover beam steel bar processing jig frame is manufactured in the steel bar processing area.
3. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: in the step 2, the processing of the corrugated steel pipe sleeve connector comprises the steps of processing a positioning frame, processing a corrugated steel pipe sleeve and installing the corrugated steel pipe sleeve.
4. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: in the step 3, the cover beam steel bar installation comprises steel bar blanking bending, steel bar installation, prestressed pipeline installation, lifting and stacking.
5. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: in the step 4, the width of the single bent cap is 12.5m, four beam plates are designed to be erected, the edges of two middle beams are respectively provided with an inner stop block, the inner stop blocks adopt a prefabrication installation mode, when the whole reinforcing steel bar of the bent cap is manufactured, the prefabricated inner stop blocks are installed on the reinforcing steel bar framework, and the prefabrication installation of the inner stop blocks of the bent cap comprises prefabrication of the inner stop blocks, installation of the inner stop blocks and setting of lifting points.
6. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: step 5, the bent cap outer stop block adopts the independent prefabrication processing and assembling construction process, compares with traditional on-the-spot processing technology, when guaranteeing the appearance quality, also can be better control the process of the easy quality problem that exists of bent cap end, and outer baffle prefabrication includes outer baffle reinforcing bar processing, anchor tackle notch installation and fixed, rings setting and concrete placement, maintenance, chisel hair.
7. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: in the step 6, the installation of the cover beam template and the concrete pouring are completed in two times, the installation of the main body side die and the concrete pouring are performed for the first time, the installation of the ridge beam side die and the concrete pouring are performed for the second time, the installation of the cover beam main body template comprises the assembly of the cover beam prefabricating pedestal and the main body template and the entering of the steel reinforcement framework, and the assembly of the main body template and the entering of the steel reinforcement framework comprise the assembly of a bottom die, the entering of a steel reinforcement cage, the assembly of an outer baffle and the installation and fixation of the.
8. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: in the step 7, the ridge beam construction comprises concrete pouring of the main body cover beam, installation of a ridge beam side die and concrete pouring of the ridge beam.
9. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: in the step 8, before the steel strand construction, the concrete is cured, and the steel strand adopts a post-penetration method.
10. The grouting sleeve connection type capping beam integral prefabricating construction process according to claim 1, characterized in that: in the step 9, the prestress tensioning and grouting comprises prestress tensioning, pipeline grouting and notch sealing.
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