CN113021603A - Construction method for prefabricated assembled diamond type bent cap - Google Patents
Construction method for prefabricated assembled diamond type bent cap Download PDFInfo
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- CN113021603A CN113021603A CN202110174906.5A CN202110174906A CN113021603A CN 113021603 A CN113021603 A CN 113021603A CN 202110174906 A CN202110174906 A CN 202110174906A CN 113021603 A CN113021603 A CN 113021603A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 10
- 239000010432 diamond Substances 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 95
- 239000010959 steel Substances 0.000 claims abstract description 95
- 230000002787 reinforcement Effects 0.000 claims abstract description 83
- 239000004567 concrete Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000003860 storage Methods 0.000 claims abstract description 6
- 238000012916 structural analysis Methods 0.000 claims abstract description 6
- 238000012937 correction Methods 0.000 claims abstract description 3
- 239000011440 grout Substances 0.000 claims description 40
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 16
- 239000002023 wood Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 10
- 238000009415 formwork Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000011241 protective layer Substances 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000009194 climbing Effects 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 19
- 238000009434 installation Methods 0.000 description 8
- 239000011521 glass Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000012545 processing Methods 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
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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
- B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention relates to a construction method of a prefabricated diamond type bent cap, which comprises the steps of prefabricating internal steel bars of the bent cap after structural analysis; the method comprises the steps of carrying out adjustable configuration and correction on a jig frame, enabling the jig frame to correspond to a half section of a cover beam, configuring a positioning disc for the jig frame and installing the positioning disc, installing a steel reinforcement framework after a grouting sleeve is placed, putting the steel reinforcement framework into a mold, installing a template, carrying out concrete pouring, mold stripping and maintenance on a prefabricated cover beam, and storing the processed cover beam to a preset area for storage. The invention avoids mutual collision and collision among the internal components of the bent cap, can adjust the jig frame to overcome the problems of poor adaptability and non-adjustability of the binding platform, ensures accurate positioning of the die by double positioning, and ensures the positioning precision among the structures. The invention saves cost, replaces the traditional integrated treatment with an assembly type treatment mode, realizes the repeated use of parts and templates, improves 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 produce pollution.
Description
Technical Field
The invention relates to the technical field of road, railway or bridge building, in particular to a construction method of a prefabricated diamond type bent cap.
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.
In the prior art, some engineering problems to be solved urgently exist in the construction of prefabricated assembled diamond bent cap:
(1) the diamond-shaped bent cap has the advantages that the embedded parts such as the steel bars and the prestressed corrugated pipes in the diamond-shaped bent cap are large in number, and based on a traditional two-dimensional construction drawing, the spatial positions of the embedded parts are easy to collide in the construction process, so that the construction quality and efficiency of the prefabricated bent cap are limited;
(2) the shape and the size of the reinforcing steel bars of all sections in the diamond-shaped bent cap are different, the reinforcing steel bars need to be positioned and fixed in the process of binding the reinforcing steel bar cage, the reinforcing steel bars can be ensured to be in a required shape, but the existing binding platform of the bent cap reinforcing steel bar cage cannot be adjusted, one bent cap corresponds to one platform and cannot be adapted to different bent caps, and the manufacturing cost of the bent cap is increased;
(3) the diamond-type bent cap is a complex component with multiple corner sections, a bent cap mould is required to be used for forming and fixing the bent cap, the bent cap is large in size and large in required mould size, a bottom plate of the bent cap mould and a support are required to be fixed on the support fixed on the ground, then all parts of the mould are sequentially installed, concrete is poured into the mould, if the deviation of the installation position of the bottom plate is too large, the deviation of the installation size of the mould is directly too large, and the bent cap cannot be smoothly connected with a pier stud on a construction site;
(4) the existing positioning structure is unreasonable in structure, the positioning process needs to be carefully aligned by a hoisting worker, the positioning is easy to be inaccurate, the time consumption of the positioning process is long, and the efficiency is low.
Disclosure of Invention
The invention solves the problems in the prior art and provides an optimized construction method for the prefabricated diamond type bent cap.
The technical scheme adopted by the invention is that the construction method of the prefabricated assembled diamond type bent cap comprises the following steps:
step 1: carrying out structural analysis on the bent cap, and prefabricating internal reinforcing steel bars of the bent cap;
step 2: carrying out adjustable configuration and correction on a jig frame of a reinforcement cage of the bent cap; the jig frame corresponds to the half section of the cover beam;
and step 3: configuring a positioning disc for the jig frame and installing the positioning disc;
and 4, step 4: placing a grouting sleeve;
and 5: installing a steel bar framework based on the set grouting sleeve;
step 6: putting the steel reinforcement framework into a mold, and installing a template;
and 7: pouring concrete, removing a formwork and maintaining the prefabricated capping beam;
and 8: and storing the processed bent cap to 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 bent cap, so as to position the main reinforcement, the stirrup and a horizontal reinforcement and preset an open hole position;
and (3) bending the steel bar to be bent based on the analyzed stirrup cross section, setting the bent steel bar on the stirrup positioning disc, and connecting the positioning steel bar in a matching manner to obtain the stirrup steel bar framework piece.
Preferably, in the step 2, the jig frame with the pre-installed capping beam comprises a base, a movable support is arranged on the base in a sliding fit manner, a transverse supporting beam and a connecting hole for connecting the transverse supporting beam are arranged on the movable support, and the connecting holes are vertically distributed along the movable support;
calibrating the jig frame;
the single side of the jig frame and the position of a positioning stirrup on the climbing frame are provided with grooves for controlling the distance between stirrups, and the side surface adopts channel steel grooves to control the position of the stirrup so as to ensure the thickness of a protective layer;
based on the length and the section width of the bent cap, the position of the bracket relative to the base is adjusted along the length direction and the width direction of the bent cap in the horizontal direction, and the bracket is matched with the bent cap.
Preferably, in step 3, a positioning disc is installed in a positioning disc frame of the jig frame, and the positioning disc corresponds to four sides of the positioning disc frame.
Preferably, in the step 4, each grouting sleeve is vertically installed on the positioning plate and fixed, the main rib is inserted into the upper part of the grouting sleeve, and the main rib and the grouting sleeve are sealed; a plurality of stirrups are sleeved outside all the grouting sleeves;
the grouting sleeve is provided with a grout inlet pipe and a grout outlet pipe, the grout inlet pipe and the grout outlet pipe of the grouting sleeves on the two sides adopt galvanized iron pipes, and the grout inlet pipe and the grout outlet pipe of the grouting sleeve in the middle are PVC pipes and lead to the top of the cover beam.
Preferably, the step 5 comprises the steps of:
step 5.1: arranging wet joint end plates at the ends to be butted of the half sections of the cover beams, wherein the end plates are vertical;
step 5.2: sequentially mounting bent cap stirrup steel bar framework sheets from a first stirrup at the edge of the grouting sleeve in the slot of the jig frame;
step 5.3: a plurality of main reinforcements penetrate through the stirrup reinforcement framework piece and the main reinforcement reserved openings of the end plates, the main reinforcements and the stirrup reinforcement framework piece are fixed after positioning, and the distance between the plurality of main reinforcements is preset; pre-butting and calibrating main ribs of 2 half sections of cover beams;
step 5.4: installing and welding bent steel bars in the bent cap beam framework; a plurality of horizontal bars penetrate through the stirrup steel bar framework piece and the end plate, and the horizontal bars and the stirrup steel bar framework piece are correspondingly bound and fixed;
step 5.5: a prestressed corrugated pipe penetrates through the reserved prestressed positioning area, and is fixed and calibrated again through U-shaped ribs;
step 5.6: installing a P anchor limiting plate in the steel reinforcement framework, inserting a steel strand, closely attaching an end extrusion sleeve of the steel strand to the P anchor limiting plate, and exposing the end of the steel strand out of the corresponding end of the extrusion sleeve by a preset length;
step 5.7: installing embedded anchors and deep embedded sleeves in the reinforcement cages at the tail parts of the bent caps and the wet joints in the middle, wherein the anchors are horizontally arranged, and 3 layers of reinforcing steel bar net sheets are installed at the spiral ribs;
step 5.8: and installing an embedded part, wherein the embedded part comprises a stop block, a lifting point and a support base stone reinforcing steel bar.
Preferably, in the step 6, the template comprises a straight section bottom template corresponding to the grouting sleeve, an overhanging section bottom template is arranged at the end part of the straight section bottom template, side templates are respectively arranged at the tops of two sides of the straight section bottom template and the overhanging section bottom template in a matching manner, an end template is arranged between two ends of the two side templates in a matching manner, and the two end templates are respectively matched with corresponding edges of the straight section bottom template and the overhanging section bottom template;
the step 6 comprises the following steps:
step 6.1: reserving an arrangement space of a positioning disc at the straight section bottom die, adjusting the flatness of the straight section bottom die and the overhanging section bottom die, and connecting the overhanging section bottom die with the corresponding end of the straight section bottom die;
step 6.2: fixing a sleeve positioning plate on the bottom die of the straight section, and closing the splicing seam;
step 6.3: lifting the steel reinforcement framework, sealing the grouting sleeve and all the corresponding insertion holes of the grouting sleeve, aligning a positioning plate to a sleeve positioning plate, dropping, aligning a bolt hole of a wet joint end head plate with a bolt hole of a straight section bottom die, and dropping a wing part of a half-section arranged cover beam in the overhanging section bottom die;
step 6.4: after the side molds are hoisted in place, the side molds are fixed with the corresponding straight section bottom molds and the corresponding overhanging section bottom molds, after the side molds are installed, end templates at two ends are hoisted and connected with the side molds at two sides and the corresponding straight section bottom molds or the overhanging section bottom molds into a whole through high-strength bolts;
step 6.5: after the end template is installed, an inner side template of the stop block is arranged;
step 6.6: and (6) calibrating.
Preferably, the inner side formwork of the stop block is provided with a wood formwork, bolt holes are respectively preset in the edges of the stop block protruding parts of the side formworks on two sides, high-strength bolts are anchored into the bolt holes on two sides to serve as cross braces, and a plurality of rod pieces are arranged between the cross braces and the wood formwork on the inner side of the stop block protruding parts to support the cross braces.
Preferably, in the step 7, before the concrete is poured, a plastic lining pipe is penetrated into the prestressed corrugated pipe;
when the concrete is poured, after the concrete submerges the grouting sleeve, pouring is carried out in a layered pouring mode;
when the concrete vibrates, the distance between the vibrating rod and the grouting sleeve is not less than the preset length.
The invention relates to an optimized construction method of a prefabricated diamond type bent cap, which comprises the steps of prefabricating internal steel bars of the bent cap after structural analysis is carried out on the bent cap; the jig frame of the steel reinforcement framework of the cover beam is adjustably configured and corrected, the jig frame corresponds to the half section of the cover beam, a positioning disc is configured and installed for the jig frame, the steel reinforcement framework is installed after a grouting sleeve is placed, the steel reinforcement framework is molded, a template is installed, concrete pouring, demolding and maintaining are carried out on the prefabricated cover beam, and the processed cover beam is stored to a preset area for storage.
The adjustable jig frame overcomes the problems that a cover beam reinforcement cage binding platform in the prior art is poor in adaptability and cannot be adjusted, accurate positioning is guaranteed through double positioning in the die entering process, and positioning accuracy among structures is guaranteed.
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 view of the jig frame structure of the present invention;
fig. 3 is a front view structural schematic diagram of the reinforcement cage of the present invention;
fig. 4 is a schematic structural view of a bent reinforcing bar in a steel bar framework according to the present invention;
fig. 5 is a left side view structural schematic diagram of the reinforcement cage of the present invention;
fig. 6 is a right side view structural schematic diagram of the reinforcement cage of the present invention;
FIG. 7 is a schematic structural view of a deep-buried sleeve according to the present invention;
FIG. 8 is a schematic structural view of the steel reinforcement cage after being molded;
fig. 9 is a schematic view of the inner form of the stopper 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 diamond type bent cap, which is characterized in that processing and manufacturing are carried out in a standardized site, the whole layout is divided into a raw material stacking area, a steel bar processing area, a steel bar framework binding area, a template mounting and pouring area, a burr chiseling area and a finished product stacking area, flow operation is formed, the raw material stacking area, the steel bar framework binding area, the template mounting and pouring area, the burr chiseling area and the finished product stacking area are not influenced mutually, and a loading space.
The method comprises the following steps.
Step 1: and (5) carrying out structural analysis on the bent cap, and prefabricating the internal reinforcing steel bars of the bent cap.
In the step 1, the structure analysis is to perform modeling calculation on the positions of the main reinforcement, the stirrup, the grouting sleeve and the prestressed corrugated pipe in the bent cap, realize the positioning of the main reinforcement, the stirrup and the horizontal reinforcement and preset an open hole position;
and (3) bending the steel bar to be bent based on the analyzed cross section of the stirrup, arranging the bent steel bar on the stirrup positioning disc, and connecting the positioning steel bar in a matching manner to obtain the stirrup steel bar framework piece 24.
According to the invention, the BIM technology is adopted to carry out deep calculation on the construction drawing, the size and shape data of the steel bar are obtained, 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 bent cap, the mutual collision among the components in the bent cap 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.
In the invention, the stirrup section data optimized by BIM software is recorded into numerical control equipment to bend the raw material of the steel bar; 3 limbs stirrups of every cross-section are folded according to spatial position on the stirrup positioning disk before the framework of reinforcement produces, and the welding forms wholly, welds the pipeline positioning steel bar according to the prestressing force pipeline coordinate data that this cross-section corresponds, processes into stirrup reinforcement framework piece 24 "block to carry out comparison, recheck according to the stirrup data that BIM provided, the code sign, neatly put things in good order, prevent that stirrup cross-section installation order is in disorder.
Step 2: the jig frame of the steel reinforcement framework 1 of the bent cap is adjustably configured and corrected; the jig frame corresponds to the half section of the cover beam.
In the step 2, the jig frame with the cover beam preassembled comprises a base 2, a movable support 3 is arranged on the base 2 in a sliding fit mode, a transverse support beam 4 and connecting holes for connecting the transverse support beam 4 are formed in the movable support 3, and the connecting holes are vertically distributed along the movable support;
calibrating the jig frame;
the single side of the jig frame and the position of a positioning stirrup on the climbing frame are provided with grooves for controlling the distance between stirrups, and the side surface adopts channel steel grooves to control the position of the stirrup so as to ensure the thickness of a protective layer;
the position of the bracket 3 relative to the base 2 is adjusted in the horizontal direction along the length direction and the width direction of the lid beam on the basis of the length and the section width of the lid beam, the bracket 3 cooperating with the lid beam.
In the invention, the jig frame consists of a base 2, a guide rail 5 and a movable support 3, wherein the guide rail 5 is fixed with the base 2, the movable support 3 is in sliding connection with the guide rail 5, the movable support 3 is provided with a transverse support beam 4 and a connecting hole for connecting the transverse support beam 4, and the connecting holes are vertically distributed along the movable support 3; the jig frame is used for placing the stirrup steel bar framework piece 24 and the main bars, so that the main bars and the horizontal bars can be conveniently arranged in an alternating mode, and the staff can conveniently stand.
In the invention, the assembly process of the jig frame requires that the jig frame base 2 is installed horizontally, the movable support 3 is installed and requires that the position is accurate and vertical, and the accuracy is controlled within +/-2 mm; after the jig frame is installed, the movable supports 3 are integrally measured, each movable support 3 is ensured to be on the same line, bending and twisting are prevented when a main reinforcement is installed, meanwhile, the stirrup position is accurately positioned and slotted on the single side of the jig frame and the climbing jig frame, the diameter of a notch is 2mm larger than that of the stirrup, and the installation is convenient and the stirrup spacing is strictly controlled; the side face adopts channel steel slotting to control the position of the stirrup, the thickness of the protective layer is ensured, and the universality of the jig frame of the multi-type bent cap is further realized.
And step 3: and arranging and installing a positioning plate 6 for the jig frame.
In the step 3, a positioning disc 6 is installed in a positioning disc frame 7 of the jig frame, and the positioning disc 6 corresponds to four sides of the positioning disc frame 7.
And 4, step 4: a grout sleeve 8 is placed.
In the step 4, each grouting sleeve 8 is vertically arranged on the positioning plate 6 and fixed, the upper part of each grouting sleeve 8 is inserted into a main rib, and the main rib and the grouting sleeve 8 are sealed; a plurality of stirrups 10 are sleeved outside all the grouting sleeves 8;
the grout inlet pipe and the grout outlet pipe are arranged on the grout sleeve 8, the grout inlet pipe and the grout outlet pipe of the grout sleeve 8 on the two sides adopt galvanized iron pipes, and the grout inlet pipe and the grout outlet pipe of the middle grout sleeve 8 are PVC pipes and are led to the top of the cover beam.
According to the invention, the positioning plate 6 is arranged in the positioning plate frame 7 of the jig frame, the positioning plate 6 is required to be matched with four sides of the positioning plate frame 7, each grouting sleeve 8 is vertically arranged on the positioning plate 6, the verticality of each grouting sleeve 8 after installation is detected by using a horizontal ruler or a guiding ruler, all grouting sleeves 8 are ensured to be vertical to the positioning plate 6, after the verticality is adjusted, the bottom of each grouting sleeve 8 is screwed down by using a plunger, so that the grouting sleeves 8 are expanded and extruded inside the plunger, the grouting sleeves 8 are ensured to be fixed vertically, and the deviation between the verticality and the sleeve spacing is +/-2 mm.
In the present invention, the positioning plate 6 should be completely consistent with the opening positions of the bearing platform positioning frame, the column positioning frame and the column positioning plate.
According to the invention, a main rib is inserted into the upper part of a grouting sleeve 8, the main rib and the grouting sleeve 8 are sealed by a sealing ring, glass cement is coated to ensure the sealing property of the prefabricated end of the grouting sleeve 8, the exterior of the grouting sleeve 8 is fixed by a plurality of hoops 10, such as 7 hoops, a certain distance is arranged between every two hoops 10, such as 10cm, the hoops 10 and the grouting sleeve 8 are not welded, a hoop pressing sealing ring is additionally arranged on the top of the grouting sleeve 8, and meanwhile, in order to ensure that the main rib meets the distance required by a drawing and the integral stability of the grouting sleeve 8 and the main rib, the steel bars are welded and fixed on the whole length of the circumference of the main rib.
According to the grouting sleeve, after the grouting sleeve 8 is adjusted in place, a grout inlet pipe and a grout outlet pipe are installed, the grout inlet pipe is arranged at the lower end, the grout outlet pipe is arranged at the upper end, the grout inlet pipe and the grout outlet pipe of the grouting sleeve 8 at the two sides are galvanized iron pipes, the grout inlet pipe and the grout outlet pipe of the grouting sleeve 8 in the middle are PVC pipes and led to the top of the cover beam, the grout inlet pipe and the grout outlet pipe which are arranged by the PVC pipes are marked with different colors, subsequent grouting operation is facilitated, and all conversion joints of the grout inlet pipe and the grout outlet pipe face the interior of the grouting sleeve 8, so that looseness caused by concrete pressure during pouring is prevented.
In the invention, the end parts of the slurry inlet pipe and the slurry outlet pipe of the galvanized iron pipe are provided with the slurry stop plugs, the slurry inlet pipe and the slurry outlet pipe of the PVC pipe are sealed by using adhesive tapes, whether the slurry inlet pipe and the slurry outlet pipe are loosened or not is checked, and if the slurry inlet pipe and the slurry outlet pipe are loosened, the slurry inlet pipe and the slurry outlet pipe are replaced in time, so that the sealing property of the grouting sleeve 8 is; the handing-over department of 8 bottoms of grout sleeve and positioning disk 6 uses glass to glue sealedly, prevents that grout from getting into in grout sleeve 8 and blockking up grout sleeve 8 when concrete placement.
And 5: and installing the steel reinforcement framework 1 based on the arranged grouting sleeve 8.
The step 5 comprises the following steps:
step 5.1: arranging a wet joint end plate 11 at the end part to be butted of the half-section arranged cover beam, wherein the end plate 11 is vertical;
step 5.2: sequentially installing a bent cap stirrup steel bar framework piece 24 in the groove of the jig frame from the first stirrup at the edge of the grouting sleeve 8;
step 5.3: a plurality of main reinforcements 12 penetrate through the stirrup reinforcement framework piece 24 and the main reinforcement reserved openings 18 of the end plates 11, the main reinforcements 12 and the stirrup reinforcement framework piece 24 are fixed after positioning, and the distance between the main reinforcements 12 is preset; pre-butting and calibrating main ribs 12 of 2 half sections of cover beams;
step 5.4: installing and welding bent-up steel bars 13 in the bent-up steel bar frameworks; a plurality of horizontal bars penetrate through the stirrup steel bar framework piece 24 and the end plate 11, and the horizontal bars and the stirrup steel bar framework piece 24 are correspondingly bound and fixed;
step 5.5: a prestressed corrugated pipe 14 is arranged in a preset prestressed positioning area in a penetrating mode, and is fixed and calibrated again through U-shaped ribs;
step 5.6: installing a P anchor limiting plate 15 in the steel reinforcement framework 1, inserting a steel strand, closely attaching an end extrusion sleeve of the steel strand to the P anchor limiting plate 15, and exposing the end of the steel strand out of the corresponding end of the extrusion sleeve by a preset length;
step 5.7: an embedded anchorage device and a deep-buried sleeve 17 are arranged in the reinforcement cage 1 at the tail part of the bent cap and the middle wet joint, the anchorage device is horizontally arranged, and 3 layers of reinforcing steel bar net sheets are arranged at the spiral rib;
step 5.8: and installing an embedded part, wherein the embedded part comprises a stop block, a lifting point and a support base stone reinforcing steel bar.
In the invention, as the capping beam is diamond-shaped, after the grouting sleeve 8 is installed, the capping beam steel bars need to be bound, and the grouting sleeve 8 is avoided, so that the position of the capping beam can not be disturbed, and the accurate position of the grouting sleeve 8 can not be influenced, and the subsequent assembly of the capping beam and the dislocation of the column embedded steel bars can not be caused.
In the invention, in step 5.1, the end plate 11 is vertical, and the verticality of the end plate is checked by using a horizontal ruler or a running rule, so that the deviation of the end plate 11 is ensured to be less than 2 mm.
In the invention, in step 5.3, on an operation platform for binding the tail part of the jig frame, a main reinforcement 12 penetrates through a stirrup reinforcement framework piece 24 and a main reinforcement reserved opening 18 of an end plate 11, the main reinforcement 12 and the stirrup reinforcement framework piece 24 are fixed by spot welding, and the butt joint allowable deviation of the matched main reinforcement 12 is less than 2 mm; because the binding of the steel reinforcement framework 1 of the bent cap adopts the sectional matching installation, in order to ensure that the bent cap with two sections at two ends is completely matched when the main reinforcement 12 is installed, the distance between the main reinforcement and the left and right distance between the upper layer main reinforcement and the lower layer main reinforcement are controlled by a positioning clamping groove between the upper layer main reinforcement and the lower layer main reinforcement, the deviation is +/-2 mm, and the main reinforcement 12 is connected by a double-thread sleeve; the steel pipe is sleeved and pre-butted when being prefabricated, so that the installation precision of the on-site double thread sleeves is ensured; in actual operation, still need set up more stirrups to framework of steel reinforcement 1, guarantee actual intensity.
In the invention, in step 5.4, the bent-up steel bars 13 are installed and welded in the bent-up steel bar framework, and modeling fine adjustment is carried out on the spatial position, the length and the angle of the bent-up steel bars 13 according to the BIM three-dimensional visualization model, so that the collision problem of direct blanking installation of the steel bars on site is avoided.
In the invention, in step 5.5, accurately installing the prestressed corrugated pipe 14 according to the prestressed space coordinate position, fixing the prestressed corrugated pipe again by using U-shaped ribs, and performing coordinate retest on the installed pipeline, wherein the deviation value is controlled within 5 mm; when the position of the prestressed corrugated pipe 14 conflicts with the position of the steel bar, the position of the steel bar is properly adjusted, the line shape of the prestressed corrugated pipe 14 is ensured, and the prestress loss is reduced as much as possible.
In the invention, in step 5.6, pre-embedded P anchor single-end tensioning is adopted, a P anchor limiting plate 15 is required to be accurately installed in the steel reinforcement framework 1, and a steel strand is inserted, so that an end extrusion sleeve of the steel strand of the P anchor is ensured to be tightly attached to the P anchor limiting plate 15; the steel strand wires should expose extrusion sleeve 2mm ~5mm in extrusion cover outer end to guarantee the bond stress of extrusion cover and steel strand wires, prevent to draw when the stretch-draw and take off and cause smooth silk.
In the invention, in step 5.8, embedded parts such as a stop block at the top end of the end part of the bent cap, a hanging point at the top of the bent cap, a support base stone reinforcing steel bar and the like are processed to ensure that the specification and the size of the surface of concrete and the anchoring length in the reserved concrete meet the standard design requirements, the reserved position is reserved according to the position of a design drawing, the reserved length is reserved according to the welding specification requirement of the reinforcing steel bar, the welding length is ensured, the position of the hanging point of the bent cap is calculated through three-dimensional software, and the position is calculated according to the gravity center of the.
Step 6: and (5) putting the steel reinforcement framework 1 into a mould, and installing a template.
In the step 6, the template comprises a straight section bottom die 19 corresponding to the grouting sleeve 8, an overhanging section bottom die 20 is arranged at the end part of the straight section bottom die 19, side dies 21 are respectively arranged at the tops of two sides of the straight section bottom die 19 and the overhanging section bottom die 20 in a matching manner, end templates 22 are arranged between two ends of the two side dies 21 in a matching manner, and the two end templates 22 are respectively matched with corresponding edges of the straight section bottom die 19 and the overhanging section bottom die 20;
the step 6 comprises the following steps:
step 6.1: reserving an arrangement space of the positioning plate 6 at the straight section bottom die 19, and connecting the overhanging section bottom die 20 with the corresponding end of the straight section bottom die 19 after adjusting the flatness of the straight section bottom die 19 and the overhanging section bottom die 20;
step 6.2: fixing a sleeve positioning plate on the straight section bottom die 19, and closing the splicing seam;
step 6.3: lifting the steel reinforcement framework 1, sealing the grouting sleeve 8 and all corresponding insertion holes thereof, aligning the positioning plate 6 with a sleeve positioning plate, dropping, aligning the bolt holes of the wet joint end plate 11 with the bolt holes of the straight section bottom die 19, and dropping the wing part of the half-section arranged cover beam in the overhanging section bottom die 20;
step 6.4: after the side die 21 is hoisted in place, the side die 21 is fixed with the corresponding straight section bottom die 19 and the corresponding overhanging section bottom die 20, after the side die 21 is installed, end templates 22 at two ends are hoisted and connected with the side dies 21 at two sides and the corresponding straight section bottom die 19 or the overhanging section bottom die 20 into a whole through high-strength bolts;
step 6.5: after the end template 22 is installed, an inner template of a stop block is arranged;
the inner side formwork of the stop block is provided with a wood formwork 23, bolt holes are respectively preset in the edge of the stop block protruding part of the side formworks 21 on the two sides, high-strength bolts are anchored into the bolt holes on the two sides to serve as cross braces 16, and a plurality of rod piece supports 9 are arranged between the cross braces 16 and the inner side wood formwork 23 of the stop block protruding part.
Step 6.6: and (6) calibrating.
In the invention, as the types of the bent cap are more and the structure size and the shape are changeable, the universal design is carried out on the bent cap steel template according to the same overhanging section length and different straight section lengths, the requirement of installing similar bent cap templates is realized by combining and splicing the templates on site, and the optimal template utilization rate is achieved.
In the invention, the bottom die assembly is carried out by firstly fixing the position of the bottom die 19 of the parallel and straight section, namely the grouting sleeve 8, in place and then assembling the bottom die 20 of the overhanging section; the flat and straight section bottom die 19 is reserved with a sleeve positioning plate connecting position, and positioning pin holes are formed in two sides. Firstly, flatly placing three sections of steel templates on the ground, adjusting the flatness, wherein the deviation is less than 2mm, then hoisting the bottom die 20 of the overhanging section by using a gantry crane, slowly moving the bottom die to the template 19 of the straight section, and connecting the bottom die and the template by using high-strength bolts; then, fixing a sleeve positioning plate on the flat-straight section bottom die 19, wherein the sleeve positioning plate is connected with the flat-straight section bottom die 19 through a clamping groove, and four edges of the sleeve positioning plate are provided with chamfers, so that the four-edge chamfers can be vertically and accurately positioned in the bottom die groove when the steel reinforcement framework 1 is integrally hoisted by a gantry crane; measuring and checking the straight section bottom die 19, controlling the surface of the sleeve positioning plate and the surface of the straight section bottom die 19 to be flat, controlling the flatness to be within 2mm, and measuring the position of the sleeve positioning plate, wherein the deviation value is less than 2 mm; after the sleeve positioning plate is installed and positioned, glass cement is coated on a circle around the abutted seam, and slurry leakage is avoided during concrete pouring.
In the invention, after the straight section bottom die 19 and the overhanging section bottom die 20 are assembled, the surfaces of the straight section bottom die and the overhanging section bottom die are cleaned and coated with a release agent, and after the straight section bottom die and the overhanging section bottom die are checked and confirmed to be correct, the steel reinforcement framework 1 is hoisted to the site, the hoisting process requires slow and stable speed, and the steel reinforcement framework 1 is ensured not to deform; carrying out tightness inspection on the bottom hole opening of the connecting sleeve and the grouting pipe, and sealing the pipe openings of all the grouting pipes; the steel bar framework 1 is slowly inserted into a die and accurately placed into a reserved notch of the positioning plate 6 by taking the four-side chamfer as a reference, so that the position deviation of the positioning plate 6 is ensured to be less than 2 mm; after entering the die, the position of the steel reinforcement framework 1 is checked, bolt holes of the wet joint end plate 11 are aligned with bolt holes of the straight section bottom die 19, the tail part of the wet joint end plate falls in the middle of the overhanging section bottom die 20, and the thickness of a protective layer of the steel reinforcement framework 1 is ensured to meet the requirement.
According to the invention, after a steel reinforcement framework 1 of a bent cap is hoisted into a bottom die, a side die 21 with a corresponding size is selected according to the specification type of the bent cap for hoisting, the side die 21 adopts a large block shaped steel template, and after the side die 21 is hoisted in place, a splicing surface is fixedly connected with a straight section bottom die 19 and an overhanging section bottom die 20 which are installed in place by high-strength bolts; after the side molds 21 are installed, the cantilever end templates 22 on the two sides are hoisted and connected with the side molds 21 on the two sides and the corresponding flat section bottom molds 19 or cantilever section bottom molds 20 into a whole through high-strength bolts.
In the invention, because the size of the stop block is changed complicatedly, the template at the inner side of the stop block adopts the wood mould 23, the edge of the stop block protruding part of the side moulds 21 at two sides is respectively reserved with a bolt hole, after the wood mould at the inner side of the stop block is built, a cross brace 16 is arranged by anchoring a high-strength bolt through the bolt holes at two sides, a plurality of rod piece supports 9 are arranged between the cross brace 16 and the wood mould 23 at the inner side of the stop block protruding part, generally 4, so that the wood mould 23 at the stop block is prevented from leaking slurry when concrete is poured, and meanwhile, the rod piece supports 9 are adjustable.
In the invention, double-sided adhesive tapes are adhered to all the joint positions and are coated with glass cement to prevent slurry leakage.
And 7: and (5) performing concrete pouring, form removal and maintenance on the prefabricated capping beam.
In the step 7, before concrete pouring, a plastic lining pipe is penetrated into the prestressed corrugated pipe 14;
when the concrete is poured, after the concrete submerges the grouting sleeve 8, pouring is carried out in a layered pouring mode;
when the concrete vibrates, the distance between the vibrating rod and the grouting sleeve 8 is not less than the preset length.
In the invention, C60 high-performance concrete is adopted for pouring, pumping pouring is adopted for pouring, pouring is strictly carried out according to a standard height line during pouring, machinery is protected during pouring, and the influence on the cleanness of a construction site is reduced.
In the invention, before concrete pouring, a plastic lining pipe is penetrated into the prestressed corrugated pipe 14, so that the corrugated pipe 14 is prevented from being extruded and sunken inwards, and the corrugated pipe 14 is prevented from being damaged and leaking slurry.
In the invention, the layered pouring mode is adopted after the concrete is submerged in the grouting sleeve 8, so that the connection between the grout inlet pipe and the grout outlet pipe on the grouting sleeve 8 and the grouting sleeve 8 cannot be damaged by the pressure generated by the flowing of the concrete.
In the invention, the distance between the vibrating rod and the grouting sleeve 8 is not less than 15cm when the concrete is vibrated, so that the influence of vibration on the grouting sleeve 8 is reduced.
In the invention, the form can be removed after the strength of the concrete reaches 2.5 MPa; and (5) carrying out spray maintenance in time after the template is removed, wherein the maintenance time is not less than 7 days.
In the invention, before the side die 21 is removed and the bottom die is not removed, a water-through experiment needs to be carried out on the PVC slurry inlet pipe and the PVC slurry outlet pipe of the top grouting sleeve 8, the slurry inlet pipe is connected with a water pipe, and water is flushed from the slurry outlet pipe, so that the condition that all pipelines are not blocked is ensured.
According to the invention, after the strength of the capping beam meets the requirement, the capping beam is hoisted to the detection platform by the hoisting tool, and bottom roughening is carried out by using the portable hand-push type roughening vehicle, so that coarse aggregate is exposed.
And 8: and storing the processed bent cap to a preset area for storage.
According to the invention, the bent cap is stored in the bent cap storage area after the burrs of the bent cap are formed, the bent cap is stretched after the strength meets the requirement, and the grouting of the bent cap is completed within 48 hours after the stretching is completed.
Claims (9)
1. A construction method for prefabricating and assembling type diamond bent caps is characterized in that: the method comprises the following steps:
step 1: carrying out structural analysis on the bent cap, and prefabricating internal reinforcing steel bars of the bent cap;
step 2: carrying out adjustable configuration and correction on a jig frame of a reinforcement cage of the bent cap; the jig frame corresponds to the half section of the cover beam;
and step 3: configuring a positioning disc for the jig frame and installing the positioning disc;
and 4, step 4: placing a grouting sleeve;
and 5: installing a steel bar framework based on the set grouting sleeve;
step 6: putting the steel reinforcement framework into a mold, and installing a template;
and 7: pouring concrete, removing a formwork and maintaining the prefabricated capping beam;
and 8: and storing the processed bent cap to a preset area for storage.
2. The method of constructing a prefabricated diamond-type capping beam according to claim 1, wherein: in the step 1, the structure analysis is to perform modeling calculation on the positions of the main reinforcement, the stirrup, the grouting sleeve and the prestressed corrugated pipe in the bent cap, realize the positioning of the main reinforcement, the stirrup and the horizontal reinforcement and preset an open hole position;
and (3) bending the steel bar to be bent based on the analyzed stirrup cross section, setting the bent steel bar on the stirrup positioning disc, and connecting the positioning steel bar in a matching manner to obtain the stirrup steel bar framework piece.
3. The method of constructing a prefabricated diamond-type capping beam according to claim 1, wherein: in the step 2, the jig frame with the cover beam preassembled comprises a base, a movable support is arranged on the base in a sliding fit mode, a transverse supporting beam and a connecting hole used for connecting the transverse supporting beam are arranged on the movable support, and the connecting holes are vertically distributed along the movable support;
calibrating the jig frame;
the single side of the jig frame and the position of a positioning stirrup on the climbing frame are provided with grooves for controlling the distance between stirrups, and the side surface adopts channel steel grooves to control the position of the stirrup so as to ensure the thickness of a protective layer;
based on the length and the section width of the bent cap, the position of the bracket relative to the base is adjusted along the length direction and the width direction of the bent cap in the horizontal direction, and the bracket is matched with the bent cap.
4. The method of constructing a prefabricated diamond-type capping beam according to claim 1, wherein: and in the step 3, a positioning disc is arranged in a positioning disc frame of the jig frame, and the positioning disc corresponds to four sides of the positioning disc frame.
5. The method of constructing a prefabricated diamond-type bent cap according to claim 4, wherein: in the step 4, each grouting sleeve is vertically arranged on the positioning plate and fixed, the main rib is inserted into the upper part of each grouting sleeve, and the main rib and the grouting sleeve are sealed; a plurality of stirrups are sleeved outside all the grouting sleeves;
the grouting sleeve is provided with a grout inlet pipe and a grout outlet pipe, the grout inlet pipe and the grout outlet pipe of the grouting sleeves on the two sides adopt galvanized iron pipes, and the grout inlet pipe and the grout outlet pipe of the grouting sleeve in the middle are PVC pipes and lead to the top of the cover beam.
6. The method of constructing a prefabricated diamond-type capping beam according to claim 1, wherein: the step 5 comprises the following steps:
step 5.1: arranging wet joint end plates at the ends to be butted of the half sections of the cover beams, wherein the end plates are vertical;
step 5.2: sequentially mounting bent cap stirrup steel bar framework sheets from a first stirrup at the edge of the grouting sleeve in the slot of the jig frame;
step 5.3: a plurality of main reinforcements penetrate through the stirrup reinforcement framework piece and the main reinforcement reserved openings of the end plates, the main reinforcements and the stirrup reinforcement framework piece are fixed after positioning, and the distance between the plurality of main reinforcements is preset; pre-butting and calibrating main ribs of 2 half sections of cover beams;
step 5.4: installing and welding bent steel bars in the bent cap beam framework; a plurality of horizontal bars penetrate through the stirrup steel bar framework piece and the end plate, and the horizontal bars and the stirrup steel bar framework piece are correspondingly bound and fixed;
step 5.5: a prestressed corrugated pipe penetrates through the reserved prestressed positioning area, and is fixed and calibrated again through U-shaped ribs;
step 5.6: installing a P anchor limiting plate in the steel reinforcement framework, inserting a steel strand, closely attaching an end extrusion sleeve of the steel strand to the P anchor limiting plate, and exposing the end of the steel strand out of the corresponding end of the extrusion sleeve by a preset length;
step 5.7: installing embedded anchors and deep embedded sleeves in the reinforcement cages at the tail parts of the bent caps and the wet joints in the middle, wherein the anchors are horizontally arranged, and 3 layers of reinforcing steel bar net sheets are installed at the spiral ribs;
step 5.8: and installing an embedded part, wherein the embedded part comprises a stop block, a lifting point and a support base stone reinforcing steel bar.
7. The method of constructing a prefabricated diamond-type bent cap according to claim 6, wherein: in the step 6, the template comprises a straight section bottom die corresponding to the grouting sleeve, an overhanging section bottom die is arranged at the end part of the straight section bottom die, side dies are respectively arranged at the tops of two sides of the straight section bottom die and the overhanging section bottom die in a matching manner, an end template is arranged between two ends of the two side dies in a matching manner, and the two end templates are respectively matched with corresponding edges of the straight section bottom die and the overhanging section bottom die;
the step 6 comprises the following steps:
step 6.1: reserving an arrangement space of a positioning disc at the straight section bottom die, adjusting the flatness of the straight section bottom die and the overhanging section bottom die, and connecting the overhanging section bottom die with the corresponding end of the straight section bottom die;
step 6.2: fixing a sleeve positioning plate on the bottom die of the straight section, and closing the splicing seam;
step 6.3: lifting the steel reinforcement framework, sealing the grouting sleeve and all the corresponding insertion holes of the grouting sleeve, aligning a positioning plate to a sleeve positioning plate, dropping, aligning a bolt hole of a wet joint end head plate with a bolt hole of a straight section bottom die, and dropping a wing part of a half-section arranged cover beam in the overhanging section bottom die;
step 6.4: after the side molds are hoisted in place, the side molds are fixed with the corresponding straight section bottom molds and the corresponding overhanging section bottom molds, after the side molds are installed, end templates at two ends are hoisted and connected with the side molds at two sides and the corresponding straight section bottom molds or the overhanging section bottom molds into a whole through high-strength bolts;
step 6.5: after the end template is installed, an inner side template of the stop block is arranged;
step 6.6: and (6) calibrating.
8. The method of constructing a prefabricated diamond-type capping beam according to claim 7, wherein: the side forms in the stop block are provided with wood molds, bolt holes are respectively preset in the edges of the stop block protruding parts of the side forms on two sides, high-strength bolts are anchored into the bolt holes on two sides to serve as cross braces, and a plurality of rod pieces are arranged between the cross braces and the wood molds on the inner sides of the stop block protruding parts to support the wood molds.
9. The method of constructing a prefabricated diamond-type capping beam according to claim 1, wherein: in the step 7, before concrete pouring, a plastic lining pipe is inserted into the prestressed corrugated pipe;
when the concrete is poured, after the concrete submerges the grouting sleeve, pouring is carried out in a layered pouring mode;
when the concrete vibrates, the distance between the vibrating rod and the grouting sleeve is not less than the preset length.
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| CN202110174906.5A CN113021603A (en) | 2021-02-09 | 2021-02-09 | Construction method for prefabricated assembled diamond type bent cap |
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