CN113021602A - Construction method for prefabricated bridge steel sleeve stand column - Google Patents
Construction method for prefabricated bridge steel sleeve stand column Download PDFInfo
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- CN113021602A CN113021602A CN202110174674.3A CN202110174674A CN113021602A CN 113021602 A CN113021602 A CN 113021602A CN 202110174674 A CN202110174674 A CN 202110174674A CN 113021602 A CN113021602 A CN 113021602A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B15/00—General arrangement or layout of plant ; Industrial outlines or plant installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/005—Wire network per se
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
- B21F27/20—Making special types or portions of network by methods or means specially adapted therefor of plaster-carrying network
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
Abstract
The invention relates to a construction method for prefabricating an assembled bridge steel sleeve stand column, which comprises the steps of prefabricating an internal steel bar of the stand column after structural analysis; the bed-jig is adjustably configured to match with the binding of the steel reinforcement frameworks with different lengths, so that the fine construction of the installation and welding of the inner annular stirrups of the steel sleeve, the pouring of the steel sleeve stand column and the overturning and transportation of a finished product is facilitated, and the problem of the deviation of a grouting sleeve in the hoisting process of the steel reinforcement frameworks, which is caused by the large self-weight and uneven load of the steel sleeve stand column steel reinforcement frameworks, is solved; putting the steel bar framework into a mold, installing a template, reaching a construction position in a horizontal state, and turning the steel bar framework into a vertical state; and (4) pouring concrete, removing the formwork, maintaining the prefabricated stand column, and storing the prefabricated stand column in a preset area. The invention reduces material waste, saves cost, realizes the repeated use of all parts and templates by replacing integrated treatment with an assembly type treatment mode, improves the efficiency, reduces waste, has strong operability, high precision and fast construction progress, improves the utilization rate of machines and tools, is safe and environment-friendly, and does not generate pollution.
Description
Technical Field
The present invention relates to structural members; a building material; the technical field of long-strip structural members for bearing, in particular to a construction method of a prefabricated bridge steel sleeve upright post.
Background
Along with the increasingly tense urban land and the increasingly complex traffic networks, the viaduct form greatly relieves the congestion of the urban and peripheral road networks and provides convenience for the planning of long-distance cross-domain traffic lines. Because the cost of manpower, equipment and materials is increased day by day during the construction period of the project, the construction of the viaduct is gradually changed into prefabricated assembly in order to reduce the construction cost and accelerate the construction progress.
For the construction of bridge columns, the existing method generally comprises the steps of processing a column mold meeting the size requirement in a factory after obtaining various data of the column, and then pouring and processing the column through a concrete mold; however, when the heights of the columns required by the construction site are different, a plurality of molds with different heights need to be correspondingly processed, after the columns are processed, the used molds may be discarded due to the fact that the heights of the used molds are different from the height requirements of the columns of a new construction site, meanwhile, the molds with the corresponding heights need to be processed according to the height of the new columns when the columns are produced in a factory, a large number of molds are discarded after one-time grouting processing, the amount of discarded molds produced due to size incompatibility in the factory is far larger than the amount of naturally discarded molds, on one hand, a large amount of waste of materials is caused, the production cost of the factory is high, on the other hand, a large amount of time is required to produce the molds with the corresponding heights from the beginning before each column processing, the processing efficiency of the columns.
Further, in the conventional method, the stand bottom die and the embedded base are fixed by welding, the welding affects the stress distribution and other performances of the embedded base, and further the bearing performance and the flatness of the embedded base after the stand bottom die is disassembled and assembled are greatly reduced, which means that in the processing process of the stand, the stand die and the embedded base need to be in one-to-one correspondence, the same embedded base cannot bear and position different stand dies, the embedded base is basically used at one time, and the consumption of workload and processing materials is not matched with the use frequency.
Disclosure of Invention
The invention solves the problems in the prior art and provides an optimized construction method for the prefabricated bridge steel sleeve stand column.
The technical scheme adopted by the invention is that the construction method of the prefabricated assembled bridge steel sleeve upright post comprises the following steps:
step 1: performing structural analysis on the stand column, and prefabricating an internal steel bar of the stand column;
step 2: the bed-jig of the vertical column reinforced skeleton is adjustably configured and corrected;
and step 3: arranging a positioning plate for the jig frame and installing the positioning plate;
and 4, step 4: placing a grouting sleeve and embedding a steel sleeve;
and 5: installing a steel reinforcement framework based on the arranged grouting sleeve and the steel sleeve;
step 6: putting the steel reinforcement framework into a mold, and installing a template; reaching a construction position in a horizontal state, and turning the construction position into a vertical state;
and 7: pouring concrete, removing a formwork and maintaining the prefabricated stand columns;
and 8: and storing the processed upright post in a preset area for storage.
Preferably, in the step 1, the structural analysis is to perform modeling calculation on positions of a main reinforcement, a stirrup, a grouting sleeve and a prestressed corrugated pipe inside the column, so as to position the main reinforcement, the stirrup and a horizontal reinforcement and preset an open hole position;
the internal reinforcing steel bars of the prefabricated stand columns are subjected to bending processing on the reinforcing steel bars to be bent.
Preferably, in the step 2, the jig frame of the upright post steel reinforcement framework comprises a base, the base is provided with a support in a sliding fit manner, and any one support is provided with a hanging piece;
based on the length of the upright post and the length of the cross section, the position of the bracket relative to the base is adjusted along the length and the width direction of the upright post in the horizontal direction, and the bracket is matched with the upright post; adjusting the positioning hole and the positioning groove of the hanging piece;
correcting the base to be horizontal, and if not, leveling by using a fine steel plate, wherein the error is less than 2 mm; the errors of the installation position and the verticality of the correction bracket are less than 2 mm; all scaffolds were calibrated at the same level.
Preferably, in the step 3, the positioning plate is subjected to bottom plug installation, after the bottom plugs are installed in corresponding holes of the positioning plate, the bottom plugs are kept in an unthreaded state, the positioning plate is placed at a preset position on the jig frame at a constant speed, and the position of the positioning plate is adjusted until the positioning plate is vertical.
Preferably, in the step 4, the grouting sleeve is matched with the bottom plug and sequentially installed on the jig frame;
the method comprises the steps that a jig frame is adjusted based on the height of an upright column, the position of an embedded steel sleeve is determined by taking the position of a positioning plate as a reference, the embedded steel sleeve is placed on the adjusted jig frame, the jig frame is used for adjusting and ensuring the steel sleeve to be vertical, and a reserved hole of the steel sleeve is coaxially arranged with a corresponding hole of a grouting sleeve and the positioning plate;
the grout inlet and outlet of the adjacent grouting sleeves are arranged in parallel and outwards.
Preferably, the step 5 comprises the steps of:
step 5.1: installing an annular stirrup in the pre-buried steel sleeve based on the reserved hole, wherein the annular stirrup is hooped on the inner wall of the steel sleeve;
step 5.2: a main rib penetrating through the stand column penetrates through the embedded steel sleeve, and a sealing plug is arranged at the end of the main rib and then inserted into a corresponding grouting sleeve;
step 5.3: adjusting the grouting sleeve to enable the grouting sleeve to be coaxial with the hole of the steel sleeve where the main rib is located, and screwing down the bolt rod of the positioning plate; sealing the positioning plate and the grouting sleeve, and sealing the grouting sleeve and the end part of the main rib;
step 5.4: a plurality of stirrups for reinforcement are sleeved outside all the grouting sleeves; positioning a grout inlet and a grout outlet of any grouting sleeve by using U-shaped steel bars;
step 5.5: hooping on the upper side, the lower side, the left side and the right side of the upright post;
step 5.6: mounting vertical drag hook reinforcing steel bars based on the stirrups on the upper side, the lower side, the left side and the right side of the upright post in the step 5.5; binding and/or welding the intersections of all the steel bars;
step 5.7: installing an anti-cracking steel bar mesh, wherein a cushion block and a lightning protection grounding steel plate are arranged at the mesh;
step 5.8: and (3) plug welding the main rib and the hole of the corresponding steel sleeve, and connecting the main rib and the inner wall of the corresponding steel sleeve by using an auxiliary welding rib.
Preferably, the step 6 comprises the steps of:
step 6.1: the method comprises the following steps of (1) configuring a wide-face template with a herringbone rainwater tank;
step 6.2: arranging a first side formwork on the top of one side of the wide formwork corresponding to the bulge, horizontally hoisting the steel bar framework to the wide formwork, and attaching one side of the steel bar framework to the first side formwork; confirming the machining precision;
step 6.3: a second side formwork is arranged at the top of the other side of the wide formwork corresponding to the bulge, and the second side formwork is attached to the other side of the steel reinforcement framework;
step 6.4: a top surface template is added on the top of the horizontally arranged steel reinforcement framework and is fastened, a bottom template is arranged on the top of a turnover plate, the treated steel reinforcement framework is hoisted to a slide rail, one end of the slide rail is hinged with the turnover plate, one side of the turnover plate opposite to the slide rail is a construction position, a positioning plate and the bottom template are fixed, and the bottom template corresponds to the wide surface template, the first side surface template, the second side surface template and the top surface template;
step 6.5: the turnover plate is turned over, the steel reinforcement framework arranged behind the template is in a vertical state, and the lifting device is moved to a construction position.
Preferably, in step 7, the removing sequence during the form removal is a wide-face form, a first side form or a second side form, a second side form or a first side form, and a top form.
Preferably, in step 7, the prefabricated upright post is cast in a pumping manner, and the height of the casting conduit is kept a certain distance higher than the concrete surface in the casting process.
Preferably, in the step 8, the preset area is set in a gridding manner, each prefabricated upright column corresponds to a corresponding storage grid, and an operation gap is arranged between adjacent grids; a fine sand cushion is laid in each grid.
The invention relates to an optimized construction method of a prefabricated bridge steel sleeve upright post, which comprises the steps of prefabricating an internal steel bar of the upright post after the structure of the upright post is analyzed;
the bed-jig of the vertical column reinforcement cage is adjustably configured and corrected, and the support slides forwards and backwards on the base to adjust the distance so as to match reinforcement cages with different lengths for binding, so that the problem that the adaptability of a bridge vertical column reinforcement cage binding platform in the prior art is poor and cannot be adjusted is solved;
after a positioning plate is configured and installed for the jig frame, a grouting sleeve and a pre-buried steel sleeve are placed, and a steel reinforcement framework is installed, so that the problems of installation and welding of annular stirrups in the steel sleeve are solved, the subsequent fine construction of pouring of a steel sleeve stand column and overturning and transporting of a finished product is facilitated, and the problem of deviation of the grouting sleeve in the hoisting process of the steel reinforcement framework caused by large self weight and non-uniform load distribution of the steel sleeve stand column steel reinforcement framework is solved;
the method is characterized in that a modular upright post processing die consisting of a bottom die and a side die is integrated, a steel reinforcement framework is molded, a template is installed, the steel reinforcement framework arrives at a construction position in a horizontal state, and the steel reinforcement framework is turned over to be in a vertical state; and after the prefabricated stand column is subjected to concrete pouring, form removal and maintenance, storing the treated stand column to a preset area for storage.
The invention reduces material waste, saves cost, realizes the repeated use of all parts, templates and the like by replacing the traditional integrated treatment with an assembly type treatment mode, improves the efficiency, reduces waste, has strong operability, high precision and fast construction progress, improves the utilization rate of machines and tools, is safe and environment-friendly, and does not generate pollution.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic structural view of the invention without the match between the bed-jig and the column steel reinforcement cage after embedding the steel jacket;
FIG. 3 is a schematic view of the structure of the present invention showing the positioning plate and grouting sleeve;
FIG. 4 is a schematic structural view of the pre-embedded steel sleeve and the jig frame in the invention;
FIG. 5 is a schematic structural view of the wide-side form and the first side form of the present invention after assembly;
fig. 6 is a schematic structural view of the steel reinforcement framework after the formwork is installed in the invention, from a horizontal state to a vertical state;
FIG. 7 is a schematic view of the construction of the application station of the present invention.
Detailed Description
The present invention is described in further detail with reference to the following examples, but the scope of the present invention is not limited thereto.
The invention relates to a construction method of a prefabricated bridge steel sleeve upright post, which can be used for arranging a raw material stacking area, a steel bar processing area, a steel bar framework binding area, a template mounting and pouring area and a finished product stacking area in a standardized factory, wherein finished products are taken out of the factory to form flow operation without mutual influence, and a loading space and a transportation channel are arranged in the stacking area.
The method comprises the following steps.
Step 1: carry out the structure to the stand and resolve, the inside reinforcing bar of prefabricated stand.
In the step 1, the structure is analyzed to model and calculate the positions of the main reinforcement, the stirrup, the grouting sleeve and the prestressed corrugated pipe in the upright column, so that the positioning of the main reinforcement, the stirrup and the horizontal reinforcement is realized, and a hole opening position is preset;
the internal reinforcing steel bars of the prefabricated stand columns are subjected to bending processing on the reinforcing steel bars to be bent.
According to the invention, a BIM technology is adopted to carry out deep calculation on a construction drawing, the size and shape data of a steel bar are obtained, and the accurate positioning of the main reinforcement, the stirrup and the horizontal reinforcement is realized by carrying out three-dimensional modeling and three-dimensional perspective on the stirrup, the main reinforcement, the grouting sleeve and the prestressed corrugated pipe in the upright post, so that the mutual collision among the components in the upright post is avoided, and the position and data basis is provided for the main reinforcement and the horizontal reinforcement to open holes on the end head plate; the stirrup section data optimized through the BIM software are recorded into a numerical control device to bend and process a raw steel bar material, a semi-finished steel bar is stacked in a storage area, and the stirrup section data provided by the BIM are rechecked, marked and neatly stacked to prevent the stirrups from being disordered.
Step 2: the jig frame of the vertical column reinforcement framework 1 is adjustably configured and corrected.
In the step 2, the jig frame of the upright post steel reinforcement framework 1 comprises a base 2, the base 2 is provided with a support 3 in a sliding fit mode, and any one support 3 is provided with a hanging piece;
based on the length of the upright post and the length of the cross section, the position of the bracket 3 relative to the base 2 is adjusted along the length and the width direction of the upright post in the horizontal direction, and the bracket 3 is matched with the upright post; adjusting the positioning hole and the positioning groove of the hanging piece;
correcting the level of the base 2, and if the base is not level, leveling by using a fine steel plate, wherein the error is less than 2 mm; the error of the installation position and the verticality of the correction bracket 3 is less than 2 mm; all the supports 3 are aligned in the same horizontal plane.
In the invention, a bed-jig of a stand column steel reinforcement framework 1 is composed of a base 2, a support 3 and a hanging piece matching positioning plate 4, wherein the support 3 comprises a steel bar end extending positioning plate support, a middle main bar hanging piece erecting support, a sleeve end positioning plate support and a steel sleeve head supporting support, the hanging piece comprises an upper edge main bar hanging piece, a lower edge main bar hanging piece, a left edge main bar hanging piece, a right edge main bar hanging piece and a lower edge stirrup hanging piece, all the supports and the hanging pieces are matched with the stand column steel reinforcement framework 1 and can be adjustably arranged, and the stand column steel reinforcement framework 1 is ensured not to generate deflection deformation; a support 3 of a jig frame for binding the steel reinforcement framework 1 is movably combined and connected with a base 2 through pulleys, and the support 3 slides back and forth on the base 2 to adjust the distance so as to match the binding of the steel reinforcement frameworks 1 with different lengths; the bracket 3 can also be adjusted left and right to match the section sizes of different columns; overall, the bed-jig can be adjusted the installation according to the model of the stand of production, compares in the bed-jig of fixed dimension, can practice thrift production time, reduces the waste in place, improves production efficiency.
In the invention, the bracket 3 is also provided with a plurality of positioning through holes and limiting caps for fixing the main ribs of the stand columns, the limiting caps correspond to the positioning through holes one by one, and meanwhile, the side surfaces of the limiting caps are fixed with adjusting seats provided with adjusting holes, so that the bracket is accurately leveled and positioned; in order to fix the main reinforcement of the upright post and prevent the main reinforcement from rotating and changing the position, a positioning plate 4 extending out of the steel reinforcement end is processed, and the tail end of the positioning plate 4 extends out by 5cm by adopting a round hole so as to ensure the precision; the sleeve positioning plate 4 at the tail part of the stand column steel reinforcement cage jig adopts a form that a sleeve fixed end is combined with a stand column bottom die, so that the sleeve positioning function is realized, and meanwhile, the sleeve positioning plate is a bottom die plate of the stand column in the pouring process.
In the invention, before the upright column steel reinforcement framework 1 is assembled, each part of the jig frame is inspected, rechecked and tested, and the open pore and open pore position of the hanging piece are accurately measured; in the assembling process, the bed jig base 2 is horizontally arranged, a level gauge is used for measuring, a fine steel plate is used for leveling, and the precision is controlled within 2 mm; the mounting positions of the brackets 3 are accurate, the states are vertical, and the accuracy is controlled within 2 mm; the whole measurement of each support 3 after the bed-jig installation is accomplished guarantees that every support 3 is in same line, produces the deformation when preventing the main muscle installation.
And step 3: and arranging and installing a positioning plate 4 for the jig frame.
In the step 3, the positioning plate 4 is subjected to bottom plug installation, after the bottom plugs are installed in corresponding holes of the positioning plate 4, the bottom plugs are kept in an unthreaded state, the positioning plate 4 is placed at a constant speed at a preset position on the jig frame, and the position of the positioning plate 4 is adjusted until the positioning plate 4 is vertical.
And 4, step 4: placing a grouting sleeve 5 and embedding a steel sleeve 6.
In the step 4, the grouting sleeve 5 is matched with the bottom plug and sequentially installed on the jig frame;
the method comprises the steps of adjusting a jig frame based on the height of an upright column, determining the position of an embedded steel sleeve 6 by taking the position of a positioning plate 4 as a reference, placing the embedded steel sleeve 6 on the adjusted jig frame, adjusting and ensuring the steel sleeve 6 to be vertical by using the jig frame, and coaxially arranging a reserved hole of the steel sleeve 6 with a corresponding hole of a grouting sleeve 5 and the positioning plate 4;
the grout inlet and outlet 12 of the adjacent grouting sleeves 5 are arranged in parallel and facing outward.
In the invention, the positions of the holes of the positioning plate 4 are completely consistent with the positions of the holes of the bearing platform positioning frame and the steel sleeve 6, the hole pitch and the hole diameter deviation of the holes are less than +/-2 mm, and the positioning plate 4 not only can play a role of positioning the grouting sleeve 5, but also can be used as a bottom template of the stand column in the later pouring process and is stacked in a shelf type.
According to the invention, a bottom plug is installed before a positioning plate 4 is installed, the bottom plug (sealing plunger) consists of a bolt, a plunger and a connecting screw, the technology is well known in the art, after the bottom plug is installed on the positioning plate 4, the connecting screw is not screwed down, the activity of the bottom plug is kept, after the bottom plug is installed on a hole corresponding to the positioning plate 4, the positioning plate 4 is stably placed on a jig frame at a constant speed by using a gantry crane, the position of the positioning plate 4 is adjusted until the perpendicularity is 90 degrees, and the deviation of the perpendicularity is less than 0.1 degree.
In the invention, the grouting sleeve 5 is sequentially installed and screwed into the bottom plug, and whether the bottom plug is compact and fastened is checked, and the bottom plug and the grouting sleeve 5 can be ensured to move slightly.
According to the method, a movable jig frame is adjusted according to the height of a prefabricated stand column, the position of a steel sleeve 6 is determined from a positioning plate 4, and the steel sleeve 6 is stably placed on the adjusted jig frame by using a gantry crane; the perpendicularity of the steel sleeve is ensured to be consistent with that of the positioning plate 4 by utilizing the adjustment of the jig frame; holes are reserved in the steel sleeve 6, including but not limited to main rib plug welding holes, pouring holes, vibrating holes, hoisting point holes and the like, and are consistent with the axes of the holes of the grouting sleeve 5 and the positioning plate 4.
According to the invention, horizontal rulers are placed on two sides of the steel sleeve 6 to adjust the positions, and the distances from the positioning plate 4 to four vertexes of the steel sleeve 6 are measured by the steel tape, so that the final position of the steel sleeve 6 is determined.
And 5: and installing the steel reinforcement framework based on the arranged grouting sleeve 5 and the steel sleeve 6.
The step 5 comprises the following steps:
step 5.1: installing an annular stirrup 7 based on a reserved hole in the pre-buried steel sleeve 6, wherein the annular stirrup 7 is hooped on the inner wall of the steel sleeve 6;
step 5.2: a main rib 8 penetrating through the stand column penetrates through the embedded steel sleeve 6, and a sealing plug is arranged at the end of the main rib 8 and then inserted into the corresponding grouting sleeve 5;
step 5.3: adjusting the grouting sleeve 5 to enable the grouting sleeve 5 to be coaxial with the hole of the steel sleeve 6 where the main rib 8 is located, and screwing down the bolt rod of the positioning plate 4; sealing the positioning plate 4 and the grouting sleeve 5, and sealing the grouting sleeve 5 and the end part of the main rib 8;
step 5.4: a plurality of stirrups 9 for reinforcement are sleeved outside all the grouting sleeves 5; positioning a grout inlet and outlet 12 of any grouting sleeve 5 by using a U-shaped steel bar 11;
step 5.5: the stirrups 10 on the upper side, the lower side, the left side and the right side of the upright post are arranged;
step 5.6: mounting vertical drag hook reinforcing steel bars on the basis of the stirrups 10 on the upper side, the lower side, the left side and the right side of the upright post in the step 5.5; binding and/or welding the intersections of all the steel bars;
step 5.7: installing an anti-cracking steel bar mesh, wherein a cushion block and a lightning protection grounding steel plate are arranged at the mesh;
step 5.8: and (3) plug welding the main rib 8 and the hole of the corresponding steel sleeve 6, and connecting the main rib 8 and the inner wall of the steel sleeve 6 by using an auxiliary welding rib.
In the invention, in step 5.1, according to the data provided by the BIM, the ring-shaped stirrup 7 which is processed in advance is arranged and welded in the hole reserved in the steel sleeve 6.
In the invention, in step 5.2, after the main reinforcement 8 passes through the hole of the steel sleeve 6, a sealing plug is arranged at the position 40cm away from the end of the main reinforcement 8 and is sequentially inserted into the corresponding grouting sleeve 5.
In the invention, the steel sleeve 6 comprises a sleeve body, a plurality of fins are arranged perpendicular to the inner wall of the sleeve body, holes for penetrating the annular stirrups 7 are correspondingly arranged on all the fins, and the holes of the steel sleeve 6 for penetrating the main reinforcements 8 are positioned at the outer edge of the end part of the steel sleeve 6, so that one or more main reinforcements 8 can penetrate through a space formed by the adjacent fins, the inner wall of the sleeve body and the annular stirrups 7; since the fins are only used for passing the annular stirrups 7, they are not shown in the figure; the distance between the embedded steel sleeve 6 and the positioning plate 4 is close to the total length of the upright post.
In the present invention, in step 5.3, the sealing can be performed by using glass cement.
In the invention, in step 5.4, the distance between the stirrups 9 is 10cm, and the stirrups 9 cannot be welded with the sleeve 5; a stirrup 9 is additionally arranged at the top of the grouting sleeve 5 to reinforce the grouting sleeve 5 and prevent the sealing plug from loosening; the grout inlet and outlet 12 of the grouting sleeve 5 is vertically outward, and the grout inlet and outlet 12 of the grouting sleeve 5 is reinforced by U-shaped steel bars 11 to prevent deviation; the U-shaped steel bar 11 is used for supporting one end of the grout inlet and outlet 12 by a steel bar, two ends of the U-shaped steel bar 11 are connected with the steel bar, and the grout inlet and outlet 12 penetrates out of the two ends and is positioned based on the two ends.
In the invention, in step 5.5, the distance between the stirrups 10 in the non-encryption region is 15cm, the distance between the stirrups 10 in the encryption region is 10cm, the stirrups 10 in the encryption region are firmly bound by binding wires, and the binding directions of the binding wires are uniformly bound inwards.
In the invention, in step 5.6, the vertical drag hook steel bars are parallel to the length direction of the upright post.
In the invention, in step 5.7, the thickness of the anti-cracking reinforcing steel bar mesh serving as the protective layer is not less than 25 mm.
Step 6: putting the steel reinforcement framework 1 into a mold, and installing a template; the steel plate reaches a construction position in a horizontal state and is turned into a vertical state.
The step 6 comprises the following steps:
step 6.1: a wide face template 13 with a rain gutter in a shape like a Chinese character 'shan' is configured;
step 6.2: arranging a first side formwork 14 on the top of one side of the wide formwork 13 corresponding to the bulge, horizontally hoisting the steel reinforcement framework 1 to the wide formwork 13, and attaching one side of the steel reinforcement framework 1 to the first side formwork 14; confirming the machining precision;
step 6.3: a second side formwork is arranged at the top of the other side of the wide formwork 13 corresponding to the bulge, and the second side formwork is attached to the other side of the steel reinforcement framework 1;
step 6.4: a top face template is added on the top of the horizontally arranged steel reinforcement framework 1 and is fastened, a bottom template is arranged on the top of an overturning plate 16, the treated steel reinforcement framework 1 is hoisted to a slide rail 15, one end of the slide rail 15 is hinged with the overturning plate 16, one side, opposite to the slide rail 15, of the overturning plate 16 is a construction station, a positioning plate 4 and the bottom template are fixed, and the bottom template corresponds to the wide face template 13, the first side face template 14, the second side face template and the top face template;
step 6.5: the turnover plate 16 is turned over, the steel reinforcement framework 1 provided with the template is in a vertical state, and the hanging device is moved to a construction position.
According to the invention, the upright post steel formwork consists of a bottom formwork and four side formworks (a wide-surface formwork 13, a first side formwork 14, a second side formwork and a top formwork), the side formworks are manufactured in sections according to the height difference change of prefabricated parts and the principle of facilitating the assembly and disassembly of the formworks, the panel is made of a 12mm thick steel plate, the straightness deviation is +/-1 mm, the flatness deviation is +/-1 mm, and the vertical keel steel edge and the horizontal keel steel edge are square pipes of 200mm multiplied by 100mm multiplied by 12 mm.
In the invention, the wide-face template 13 is flatly placed, the surface of the wide-face template 13 is derusted, polished and polished until the mirror effect is achieved, the rust, oil stain, wax and dust are removed, the release agent is smeared, the splicing position is tightly pasted by an adhesive tape, and the slurry leakage in the pouring process is prevented; cleaning and polishing the first side face template 14, hoisting the first side face template by using a gantry crane to be stably placed on the edge of the wide face template 13, aligning holes at splicing positions, and screwing the holes by using finish-rolled screw-thread steel nuts; then hoisting the steel bar framework 1, wherein the hoisting process is stable and slow, the steel bar framework 1 is ensured not to deform, and the steel bar framework 1 is slowly, stably and uniformly placed in the butted wide face template 13 and the first side face template 14; after the grouting sleeve 5 enters the mold, checking a grout stop plug at a grout inlet and a grout outlet, wherein the checking comprises whether the grout stop plug is loosened and falls off, whether glass cement is uniformly coated or not, whether a gap exists or not, whether a cushion block of a protective layer is damaged or not, and if the glass cement is damaged, timely cleaning and replacing; checking whether the binding of the stirrup is firm and in place; and (3) after the steel reinforcement framework 1 is subjected to mould entering inspection, mounting a second side formwork, turning a top formwork after the mounting is finished, slowly placing the top formwork on the first side formwork 14 and the second side formwork at a constant speed and stably, accurately adjusting the positions of the holes of the formworks, and screwing the holes with finish-rolled screw-thread steel nuts.
According to the invention, the overturning platform adopts a pulley type track design, the overturning plate 16 is adjusted in a sliding matching manner on the track according to the height of the prefabricated stand column, and the bottom template is pushed to the overturning plate 16 and is connected with the overturning plate 16 by bolts; this is a matter that is easily understood by those skilled in the art, and can be designed by those skilled in the art.
In the invention, after the steel reinforcement framework 1 is prepared, the steel reinforcement framework 1 which is subjected to die assembly is lifted, the wide-face template 13 with the rain gutter is connected and fixed on the sliding bearing platform, and the steel reinforcement framework 1 and the side die are correspondingly connected with the bottom template; and the prefabricated upright post is turned and hoisted by the turning plate 16, the prefabricated upright post is in a vertical state after the turning plate 16 is turned, and the gantry crane is arranged on the construction station.
And 7: and (5) performing concrete pouring, form removal and maintenance on the prefabricated stand column.
In the step 7, the removing sequence during the form removal is the wide face form 13, the first side face form 14 or the second side face form, the second side face form or the first side face form, and the top face form.
And 7, pouring the prefabricated upright column in a pumping mode, and keeping the height of the pouring guide pipe to be higher than the concrete surface for a certain distance in the pouring process.
According to the invention, a pouring pedestal 17 is arranged at a construction position, a foundation is processed and compacted before installation, an embedded steel plate 18 is arranged, then the pouring pedestal 17 is placed on the embedded steel plate 18 side by adopting customized I-shaped steel with a certain distance, such as 4cm, and the positioning plate 4 is fixed in a groove between the I-shaped steel in a buckling mode, so that the four sections are effectively and stably installed on the pouring pedestal 17.
According to the invention, the pouring operation platform adopts channel steels with two lengths as frameworks, a channel with a certain width is arranged between the channel steels, the platform can be supported on a transverse rib at the top layer of the upright post template, and the front, back, left and right adjusting screws are matched in size and placed at the top ends of the upright posts after die assembly according to the types of the prefabricated upright posts.
According to the invention, after the hoisting and placing of the casting operation platform are finished, the pumping type casting is adopted for the concrete casting of the prefabricated stand column, and the height of the casting guide pipe is kept about 1.2m higher than the concrete surface in the casting process, so that the concrete segregation caused by the overhigh falling distance of the concrete is avoided; pouring is carried out by adopting self-compacting concrete towards the upright column at the position of the prefabricated steel sleeve 6, and the excess concrete on the surface of the head of the steel sleeve 6 is removed after pouring is finished.
According to the invention, after concrete pouring is finished and certain strength is achieved, the concrete pouring operation platform and the templates are dismantled in the order of pouring operation platform, the wide-face template 14, the two side templates and the top template, a lifting appliance is hung on a template dismantling hole during template dismantling, after a finish rolling screw-thread steel nut on one side of the template is dismantled, the template is slowly lifted at a constant speed and is flatly placed in a template stacking area, and after the templates are completely dismantled, concrete residues around the bottom of the 6 heads of the steel sleeves are removed.
In the invention, the curing is spraying curing, and the curing time is 7 days.
And 8: and storing the processed upright post in a preset area for storage.
In the step 8, the preset area is arranged in a gridding mode, each prefabricated stand column corresponds to a corresponding storage grid, and an operation gap is arranged between every two adjacent grids; a fine sand cushion is laid in each grid.
In the invention, in order to save storage space, the upright column is generally short in storage time period, so that the upright column is stored in a vertical mode and is turned and transported when the upright column leaves a factory.
In the invention, the front-back distance of each grid is generally 50 cm, so that the storage and lifting of the upright posts are convenient.
In the invention, the fine sand cushion layer is used for preventing the upright column from toppling due to uneven ground.
In the present invention, it is also necessary to perform a roughening treatment of the columns to remove the surface slurry until the aggregates are exposed.
Claims (10)
1. A construction method for a prefabricated bridge steel sleeve stand column is characterized by comprising the following steps: the method comprises the following steps:
step 1: performing structural analysis on the stand column, and prefabricating an internal steel bar of the stand column;
step 2: the bed-jig of the vertical column reinforced skeleton is adjustably configured and corrected;
and step 3: arranging a positioning plate for the jig frame and installing the positioning plate;
and 4, step 4: placing a grouting sleeve and embedding a steel sleeve;
and 5: installing a steel reinforcement framework based on the arranged grouting sleeve and the steel sleeve;
step 6: putting the steel reinforcement framework into a mold, and installing a template; reaching a construction position in a horizontal state, and turning the construction position into a vertical state;
and 7: pouring concrete, removing a formwork and maintaining the prefabricated stand columns;
and 8: and storing the processed upright post in a preset area for storage.
2. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 1, characterized in that: in the step 1, the structure is analyzed to model and calculate the positions of the main reinforcement, the stirrup, the grouting sleeve and the prestressed corrugated pipe in the upright column, so that the positioning of the main reinforcement, the stirrup and the horizontal reinforcement is realized, and a hole opening position is preset;
the internal reinforcing steel bars of the prefabricated stand columns are subjected to bending processing on the reinforcing steel bars to be bent.
3. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 1, characterized in that: in the step 2, the jig frame of the upright post steel reinforcement framework comprises a base, wherein a support is arranged on the base in a sliding fit manner, and a hanging piece is arranged on any one support;
based on the length of the upright post and the length of the cross section, the position of the bracket relative to the base is adjusted along the length and the width direction of the upright post in the horizontal direction, and the bracket is matched with the upright post; adjusting the positioning hole and the positioning groove of the hanging piece;
correcting the base to be horizontal, and if not, leveling by using a fine steel plate, wherein the error is less than 2 mm; the errors of the installation position and the verticality of the correction bracket are less than 2 mm; all scaffolds were calibrated at the same level.
4. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 1, characterized in that: and in the step 3, mounting a bottom plug of the positioning plate, keeping the positioning plate in an unthreading state after the bottom plug is mounted in a corresponding hole of the positioning plate, placing the positioning plate at a constant speed at a preset position on the jig frame, and adjusting the position of the positioning plate until the positioning plate is vertical.
5. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 4, wherein the construction method comprises the following steps: in the step 4, the grouting sleeve is matched with the bottom plug and sequentially installed on the jig frame;
the method comprises the steps that a jig frame is adjusted based on the height of an upright column, the position of an embedded steel sleeve is determined by taking the position of a positioning plate as a reference, the embedded steel sleeve is placed on the adjusted jig frame, the jig frame is used for adjusting and ensuring the steel sleeve to be vertical, and a reserved hole of the steel sleeve is coaxially arranged with a corresponding hole of a grouting sleeve and the positioning plate;
the grout inlet and outlet of the adjacent grouting sleeves are arranged in parallel and outwards.
6. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 5, wherein the construction method comprises the following steps: the step 5 comprises the following steps:
step 5.1: installing an annular stirrup in the pre-buried steel sleeve based on the reserved hole, wherein the annular stirrup is hooped on the inner wall of the steel sleeve;
step 5.2: a main rib penetrating through the stand column penetrates through the embedded steel sleeve, and a sealing plug is arranged at the end of the main rib and then inserted into a corresponding grouting sleeve;
step 5.3: adjusting the grouting sleeve to enable the grouting sleeve to be coaxial with the hole of the steel sleeve where the main rib is located, and screwing down the bolt rod of the positioning plate; sealing the positioning plate and the grouting sleeve, and sealing the grouting sleeve and the end part of the main rib;
step 5.4: a plurality of stirrups for reinforcement are sleeved outside all the grouting sleeves; positioning a grout inlet and a grout outlet of any grouting sleeve by using U-shaped steel bars;
step 5.5: hooping on the upper side, the lower side, the left side and the right side of the upright post;
step 5.6: mounting vertical drag hook reinforcing steel bars based on the stirrups on the upper side, the lower side, the left side and the right side of the upright post in the step 5.5; binding and/or welding the intersections of all the steel bars;
step 5.7: installing an anti-cracking steel bar mesh, wherein a cushion block and a lightning protection grounding steel plate are arranged at the mesh;
step 5.8: and (3) plug welding the main rib and the hole of the corresponding steel sleeve, and connecting the main rib and the inner wall of the corresponding steel sleeve by using an auxiliary welding rib.
7. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 1, characterized in that: the step 6 comprises the following steps:
step 6.1: the method comprises the following steps of (1) configuring a wide-face template with a herringbone rainwater tank;
step 6.2: arranging a first side formwork on the top of one side of the wide formwork corresponding to the bulge, horizontally hoisting the steel bar framework to the wide formwork, and attaching one side of the steel bar framework to the first side formwork; confirming the machining precision;
step 6.3: a second side formwork is arranged at the top of the other side of the wide formwork corresponding to the bulge, and the second side formwork is attached to the other side of the steel reinforcement framework;
step 6.4: a top surface template is added on the top of the horizontally arranged steel reinforcement framework and is fastened, a bottom template is arranged on the top of a turnover plate, the treated steel reinforcement framework is hoisted to a slide rail, one end of the slide rail is hinged with the turnover plate, one side of the turnover plate opposite to the slide rail is a construction position, a positioning plate and the bottom template are fixed, and the bottom template corresponds to the wide surface template, the first side surface template, the second side surface template and the top surface template;
step 6.5: the turnover plate is turned over, the steel reinforcement framework arranged behind the template is in a vertical state, and the lifting device is moved to a construction position.
8. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 7, characterized in that: in the step 7, the removing sequence during the form removal is the wide face form, the first side face form or the second side face form, the second side face form or the first side face form, and the top face form.
9. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 1, characterized in that: and 7, pouring the prefabricated upright column in a pumping mode, and keeping the height of the pouring guide pipe to be higher than the concrete surface for a certain distance in the pouring process.
10. The construction method of the prefabricated assembled bridge steel sleeve stand column according to claim 1, characterized in that: in the step 8, the preset area is arranged in a gridding mode, each prefabricated stand column corresponds to a corresponding storage grid, and an operation gap is arranged between every two adjacent grids; a fine sand cushion is laid in each grid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110174674.3A CN113021602A (en) | 2021-02-09 | 2021-02-09 | Construction method for prefabricated bridge steel sleeve stand column |
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| CN202110174674.3A CN113021602A (en) | 2021-02-09 | 2021-02-09 | Construction method for prefabricated bridge steel sleeve stand column |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113954230A (en) * | 2021-10-28 | 2022-01-21 | 浙江交工集团股份有限公司 | Processing method of prefabricated hollow pier |
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| US20200087875A1 (en) * | 2016-12-07 | 2020-03-19 | Kirchdorfer Fertigteilholding Gmbh | Reinforcing element |
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Application publication date: 20210625 |