CN117364816A - Construction method for prefabricating and assembling open caisson steel bar segments - Google Patents
Construction method for prefabricating and assembling open caisson steel bar segments Download PDFInfo
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- CN117364816A CN117364816A CN202311132160.7A CN202311132160A CN117364816A CN 117364816 A CN117364816 A CN 117364816A CN 202311132160 A CN202311132160 A CN 202311132160A CN 117364816 A CN117364816 A CN 117364816A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
- 239000010959 steel Substances 0.000 title claims abstract description 91
- 238000010276 construction Methods 0.000 title claims abstract description 84
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 93
- 230000002787 reinforcement Effects 0.000 claims abstract description 48
- 239000010410 layer Substances 0.000 claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000009417 prefabrication Methods 0.000 claims abstract description 13
- 239000011241 protective layer Substances 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 abstract description 14
- 238000009434 installation Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 7
- 210000003205 muscle Anatomy 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 101100366060 Caenorhabditis elegans snap-29 gene Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
Abstract
The invention belongs to the technical field of installation and construction of open caisson steel bars of a suspension bridge anchor ingot, and particularly provides a construction method for prefabricating and assembling open caisson steel bar segments, wherein the open caisson steel bars are divided into segments; manufacturing a reinforcing steel bar according to the divided sections; manufacturing a hoisting stiffness framework of each section; manufacturing reinforcing steel bar meshes of all the sections; the upper layer and the lower layer of the hoisting stiffness framework of each section are connected with the reinforcing steel bar meshes of the corresponding section, so that prefabrication of reinforcing steel bars of each section is completed; moving the prefabricated reinforcing steel bars of each section to the divided corresponding sections and installing; installing a protective layer cushion block on the installed steel bar to finish construction; the construction method solves the problems of large project amount, poor effect and low work efficiency of the conventional site binding reinforcement under the construction conditions of large number, large type and large configuration of the reinforcement. The invention has small engineering quantity, widens the construction process of the open caisson steel bar segment, and has strong practicability, reliable safety performance and high construction efficiency.
Description
Technical Field
The invention belongs to the technical field of installation and construction of open caisson steel bars of suspension bridge anchor ingots, and particularly relates to a construction method for prefabricating and splicing open caisson steel bar segments.
Background
With the rapid development of economy and society in China, bridges are increasingly larger in span, the suspension bridges are favored by virtue of excellent structural performance and ultrahigh cost performance, the suspension bridges are divided into ground anchor suspension bridges and self-anchored suspension bridges according to main cable anchoring modes, most suspension bridges adopt ground anchor type anchor main cables, the ground anchor type anchor bridge is an optimal stress mode of a large-span suspension bridge, gravity type anchor ingots comprise anchors and foundations, the basic function of the anchor ingots is that the main cable tension is transmitted to the anchors through an anchor ingot system, the force is transmitted to the foundations through the anchors, the force is finally transmitted to the foundations, the whole bridge stress balance is achieved, the gravity type anchor ingots resist vertical component force of the main cable by virtue of dead weight, the friction force or embedding force of the anchor ingots and the foundations resist horizontal component force, the anchor sinking well is built in soft soil stratum, the main cable tension is transmitted to the soil layer through an anchor sinking well structure, and the bearing capacity of adjacent soil bodies affect the safety of the large-span suspension bridge. The construction method has the advantages that the on-site reinforcement binding workload is large in open caisson high-rise construction, the on-site operation surface is gradually unfolded from the point or the surface, the on-site operation is high in safety control condition, the reinforcement binding workload is large, the reinforcement installation condition is limited, the reinforcement engineering quality common problems such as reinforcement protection layers, reinforcement intervals and the like are more obvious, and the construction organization problem that needs to be overcome is solved.
The Chinese patent document with the publication number of CN116427445A and the publication date of 2023, 7 and 14 discloses a pluggable circular assembled prefabricated open caisson and a construction method, the prefabricated open caisson comprises a prefabricated shaft, the prefabricated shaft is formed by annularly splicing a plurality of longitudinally arranged support columns, each support column comprises a superposition part and a blade foot part, the superposition part is formed by connecting and installing and fixing a plurality of superposition splicing blocks up and down, and the blade foot part is installed and fixed at the lower end of the superposition part; the middle part of the overlapped splicing block is provided with at least one longitudinal through grouting hole, the inner side wall and the outer side wall of the overlapped splicing block are respectively provided with a diversion hole, and the diversion holes are communicated with the grouting holes. The ground assembly is adopted, the open caisson method is adopted to sink, the open caisson is pulled out after backfilling in the prefabricated shaft is completed, the time for cast-in-situ manufacturing of the open caisson is greatly shortened, meanwhile, the open caisson method is adopted to sink, different geological requirements can be met, and the characteristic that the open caisson is pulled out after construction is completed solves the problems that the open caisson is difficult to dismantle, the underground space is occupied and resources are wasted in the cast-in-situ method. The document does not solve the problems of large project amount, poor effect and low work efficiency of the conventional site binding reinforcement under the construction conditions of large number of reinforcement bars, multiple types and multiple configurations in the prior art.
Disclosure of Invention
The construction method for prefabricating and assembling open caisson steel bar segments aims to overcome the problems of large project amount, poor effect and low work efficiency of conventional site binding steel bars under the construction conditions of large number of steel bars, large types and large configuration in the prior art.
Therefore, the invention provides a construction method for prefabricating and assembling open caisson steel bar segments, which comprises the following steps:
1) Dividing the wall steel bars and partition steel bars of the open caisson into sections;
2) Manufacturing a reinforcing steel bar according to the divided sections;
3) Manufacturing a hoisting stiffness framework of each section;
4) Manufacturing reinforcing steel bar meshes of all the sections;
5) The upper layer and the lower layer of the hoisting stiffness framework of each section are connected with the reinforcing steel bar meshes of the corresponding section, so that prefabrication of reinforcing steel bars of each section is completed;
6) Moving the prefabricated reinforcing steel bars of each section to the divided corresponding sections and installing;
7) And installing a protective layer cushion block on the installed steel bar to finish construction.
Preferably, the step 1) is to divide the wall steel bars of the open caisson into sections by adopting a long line matching method.
Preferably, the segments of the open caisson divided by the wall steel bars comprise a straight segment, a T-shaped segment and an L-shaped segment according to the plane shape.
Preferably, the partition reinforcement of the open caisson in step 1) is segmented according to the length of the approach reinforcement.
Preferably, the reinforcement bar is manufactured in the step 2) by adopting one or more of C12, C16, C20, C25 and C28 reinforcement bars.
Preferably, during the manufacturing, the C25 and C28 reinforcing steel bars are connected by adopting a rolling straight thread sleeve, and one or more reinforcing steel bar joints of C12, C16 and C20 are welded or connected in a lap joint mode.
Preferably, the number of the joints for lengthening the reinforcing steel bars is not more than 50% of the total section at the same section.
Preferably, the step 1) of segment division includes a transverse division and a longitudinal division, and the transverse division and the longitudinal division are divided into multiple layers; in the longitudinal division, the divided sections are marked as a first section and a second section … nth section in a sequence from bottom to top, the first section is a steel structure open caisson, the second section is installed in a way of installing reinforcing steel bars one by one, the third section to the nth section 1 are installed in a way of adopting the steps 3) to 6), and the nth section is a well cover.
Preferably, the hoisting stiffness framework comprises a plurality of upright posts (1), parallel joints (2) and inclined struts (3), wherein the upright posts (1) are vertically arranged at intervals, and every two adjacent upright posts (1) are connected from top to bottom through the parallel joints (2) and the inclined struts (3).
Preferably, lifting lugs are arranged on the hoisting stiffness framework.
The invention has the beneficial effects that:
1. according to the construction method for prefabricating and assembling the open caisson reinforcing steel bar segments, segment division is carried out on the wall reinforcing steel bars and the partition wall reinforcing steel bars of the open caisson; manufacturing a reinforcing steel bar according to the divided sections; adopting the manufactured steel bars to manufacture hoisting stiffness frameworks of all the sections; manufacturing reinforcing steel bar meshes of all the sections; the upper layer and the lower layer of the hoisting stiffness framework of each section are connected with the reinforcing steel bar meshes of the corresponding section, so that prefabrication of reinforcing steel bars of each section is completed; moving the prefabricated reinforcing steel bars of each section to the divided corresponding sections and installing; installing a protective layer cushion block on the installed steel bar to finish construction; the construction method for prefabricating and assembling the open caisson reinforcement segments reduces the influence of factors such as site, weather, engineering quantity and the like on site reinforcement installation construction, widens the open caisson reinforcement segment construction process, has strong practicability, reliable safety performance and high construction efficiency, and is worthy of further popularization and application in open caisson reinforcement construction of similar large-span suspension bridges in the future.
2. According to the construction method for prefabricating and assembling the open caisson reinforcing steel bar segments, provided by the invention, the segment division is carried out on the wall reinforcing steel bars of the open caisson by adopting a long-line matching method, the segment division is carried out on the partition reinforcing steel bars of the open caisson according to the length of the entering reinforcing steel bars, and prefabrication of each segment reinforcing steel bar is completed according to the divided segments, so that standardized and assembled reinforcing steel bar manufacturing is realized.
3. The construction method for prefabricating and assembling the open caisson reinforcement segments is applied to open caisson reinforcement construction engineering of a suspension bridge, and after construction is completed, hoisting stiffness framework connection is released according to project requirements, and the method is reused, so that the purposes of energy conservation and environmental protection are achieved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of the division of the wall and partition rebars of an open caisson into horizontal segments;
FIG. 2 is a schematic view of the division of longitudinal sections of wall and partition reinforcements of an open caisson;
fig. 3 is a schematic drawing of prefabricated reinforcing bars of various segments;
FIG. 4 is a front view of a structure for lifting a stiff skeleton;
FIG. 5 is a right side view of the structure of FIG. 4;
fig. 6 is a top view of the structure of fig. 4.
Reference numerals illustrate: 1. a column; 2. parallel connection; 3. diagonal bracing; 4. and (5) segment reinforcing steel bars.
Detailed Description
Example 1:
a construction method for prefabricating and assembling open caisson reinforcement bar segments comprises the following steps:
1) Segment-dividing the wall steel bars and the partition steel bars of the open caisson (as shown in figure 1);
2) Manufacturing a reinforcing steel bar according to the divided sections;
3) Manufacturing a hoisting stiffness framework of each section;
4) Manufacturing reinforcing steel bar meshes of all the sections;
5) The upper layer and the lower layer of the hoisting stiffness framework of each section are connected with the reinforcing steel bar meshes of the corresponding section, so that prefabrication of reinforcing steel bars of each section is completed;
6) Moving the prefabricated reinforcing steel bars of each section to the divided corresponding sections and installing;
7) And installing a protective layer cushion block on the installed steel bar to finish construction.
The numbers 1-30 in fig. 1 are the well bore numbers of the open caisson.
According to the construction method for prefabricating and assembling open caisson reinforcement bars, based on a suspension bridge open caisson reinforcement bar structure system, through the thought of reinforcement assembly construction design, according to open caisson section division, prefabrication processing is completed in a reinforcement field, a crane is transported to a construction site through a transport vehicle, and is hoisted and installed in place, connection with the reinforcement of the previous section is carried out on site, and the complete set of construction mode greatly reduces the work load of the site, improves the construction efficiency and has good application effect. Therefore, the high-efficiency high-rise assembling construction technology smoothly completes the high-rise construction task, and the economical and reasonable construction organization is practically applied, so that the complete construction data is obtained. The construction method for prefabricating and assembling the open caisson reinforcement segments reduces the influence of factors such as site, weather, engineering quantity and the like on site reinforcement installation construction, widens the open caisson reinforcement segment construction process, has strong practicability, reliable safety performance and high construction efficiency, and is worthy of further popularization and application in open caisson reinforcement construction of similar large-span suspension bridges in the future.
Example 2:
on the basis of the embodiment 1, the well wall steel bars of the open caisson in the step 1) are segmented by adopting a long line matching method.
So as to reduce the errors in the manufacture of the reinforcing steel bar segments and ensure that the joints of the reinforcing steel bar segments can be accurately matched and quickly butted.
Preferably, the segments of the open caisson divided by the wall steel bars comprise a straight segment, a T-shaped segment and an L-shaped segment according to the plane shape. The actual hoisting capacity in the field is fully exerted, and the segment division is facilitated. Wherein, the horizontal steel bars between the segments of the well wall steel bars are phi 28 steel bars and phi 25 steel bars, and the phi 25 steel bars and the phi 28 steel bars are connected by adopting rolling straight thread sleeves.
Preferably, the partition reinforcement of the open caisson in step 1) is segmented according to the length of the approach reinforcement.
The partition wall reinforcing steel bars fully utilize the standard length reinforcing steel bars of the approach as the reinforcing steel bar segment division standard, and the intermediate part is subjected to on-site approach supplement, so that segment division is facilitated.
Preferably, the reinforcement bar is manufactured in the step 2) by adopting one or more of C12, C16, C20, C25 and C28 reinforcement bars. The materials and the materials are convenient to obtain, the strength meets the construction requirement, and the method is economical and practical.
Preferably, during the manufacturing, the C25 and C28 reinforcing steel bars are connected by adopting a rolling straight thread sleeve, and one or more reinforcing steel bar joints of C12, C16 and C20 are welded or connected in a lap joint mode. Convenient operation, high connection strength and good overall stability.
Preferably, the number of the joints for lengthening the reinforcing steel bars is not more than 50% of the total section at the same section. The workload of connection is reduced, and the cost is reduced.
Specifically, after the reinforced bar materials are sent to a factory, the reinforced bar materials and the mechanical connection joints are sampled and inspected according to the requirements, and the materials are entrusted to the detection units with corresponding qualification to carry out mechanical and chemical tests, and the detected items reach the qualification standard. According to the requirements of segment division, reinforcement binding design and technical specifications, the arrangement, overlap joint length, joint staggered spacing and the like of the prefabricated reinforcements of each segment are determined, and reasonable and standard blanking of each reinforcement is ensured.
Preferably, as shown in fig. 2 and 3, the step 1) of segment division includes a transverse division and a longitudinal division, and the transverse division and the longitudinal division are divided into multiple layers; in the longitudinal division, the divided sections are marked as a first section and a second section … nth section in a sequence from bottom to top, the first section is a steel structure open caisson, the second section is installed in a way of installing reinforcing steel bars one by one, the third section to the nth section 1 are installed in a way of adopting the steps 3) to 6), and the nth section is a well cover.
Specifically, the first section is a steel structure open caisson, and is directly sunk in place without prefabricating reinforcing steel bars. The second section open caisson reinforcing steel bar penetrates the preformed hole of the steel shell annular plate because of erecting the muscle, and the adoption prefabricated installation scheme has perforation difficulty, utilizes tower crane and crane to combine special lifting appliance to hoist to construction platform by bundle, installs by root again, according to vertical earlier then the horizontal drag hook muscle, from down ascending order, installs from open caisson central authorities. The third section to the n-1 section of open caisson steel bars adopt a prefabricated steel bar installation scheme, steel bars of corresponding sections are prefabricated in a back field, the section of steel bars are hoisted in place by adopting special hoisting tools, and vertical bars and drag hook bars which are about 1m are reserved on two sides of a section of steel bar joint respectively and are installed on site one by one. When the steel bars are connected on site, the steel bars with the diameter more than or equal to 25mm are connected by adopting a straight threaded joint, and the rest steel bars are connected by adopting lap joint with the length not less than 35 d. When binding, each crossing point must be firmly bound, and the concrete protection layer should not enter the binding head. The installation precision of the steel bars meets the standard requirements.
Taking A2-1 as an example in fig. 3, where a is a prefabricated type, 2 is a hierarchical level, 1 is a plane number, and other references in fig. 3 refer to the explanation of A2-1, similar to A2-1.
Step 4) manufacturing reinforcing steel bar meshes of all the sections; step 5), connecting the upper layer and the lower layer of the hoisting stiffness framework of each section with the reinforcing steel bar meshes of the corresponding section, and finishing prefabrication of reinforcing steel bars of each section;
the method comprises the following steps: the reinforcing steel mesh is prefabricated and assembled, the reinforcing steel bar field adopts the industrial steel to set up and hoist the stiff skeleton, the reinforcing steel mesh of lower floor is installed on the prefabricated hoist and mount stiff skeleton earlier, the telescopic connection is used to hoist the stiff skeleton in the segmentation department, install upper reinforcing steel mesh and draw hook reinforcing steel again, all become whole, with the sleeve of segment junction unpacking, transport.
And (3) checking and accepting the reinforcing steel bars, transferring the reinforcing steel bars, after the prefabrication of the open caisson section reinforcing steel bars is finished, numbering according to the corresponding positions of the prefabrication sections, hanging the reinforcing steel bar section identification plates, and transporting the reinforcing steel bars to the heavy range of the on-site tower crane by a flat car to implement hoisting operation.
Preferably, as shown in fig. 4 to 6, the hoisting stiffness framework comprises a plurality of upright posts 1, parallel joints 2 and inclined struts 3, wherein the upright posts 1 are vertically arranged at intervals, two adjacent upright posts 1 are connected through the parallel joints 2 and the inclined struts 3, the parallel joints 2 are horizontally arranged from top to bottom at intervals, and the inclined struts 3 are positioned between the two adjacent parallel joints 2.
Specifically, the number and the distribution of the upright posts 1, the parallel connection 2 and the diagonal braces 3 are selected according to actual conditions, and the requirements are met. The manufacturing of hoist and mount strength nature skeleton, the vertical stand of hoist and mount strength nature skeleton 1, the level is to flat-bed 2 and bracing 3 all adopt the channel-section steel, through bolted connection, form whole frame construction, according to open caisson reinforcing bar design drawing, at the main muscle locator of hoist and mount reinforcing bar skeleton of prefabricated field processing, the main muscle locator is according to the accurate fluting of main muscle design interval, during follow-up hoist and mount reinforcing bar skeleton processing, install the semi-manufactured goods main muscle that the processing was accomplished according to the trench, both guaranteed the reinforcing bar installation accuracy and accelerated construction work efficiency, moreover, the steam generator is simple in structure, economical and practical, and convenient operation, stability is high.
Preferably, lifting lugs are arranged on the hoisting stiffness framework.
Specifically, the site construction of the reinforced bridge site, after the prefabricated reinforced bar segments are transported to the site, the east side tower crane of the open caisson is adopted, lifting is carried out after turning over is completed, and lifting lugs are arranged on the lifting stiffness framework so as to reduce deformation of the prefabricated reinforced bar segments. In the whole hoisting process, the steel reinforcement framework is ensured to be good in shape, deformation signs are avoided, and drawing and specification requirements are met. Part of the reinforcing steel bars between the transverse and longitudinal prefabricated reinforcing steel bars at the partition wall parts are installed in a site binding mode, the reinforcing steel bars with the diameter larger than or equal to 25mm are mechanically connected, and the other reinforcing steel bars are in lap joint connection. When binding, the steel bar crossing points of the corner parts of the components are required to be firmly bound, and the steel bar crossing points of the straight areas are required to be bound in a staggered manner. The protection cap on the screw head and the plastic sealing cover at the end of the sleeve are firstly recovered, and the conditions of whether the steel bar specification is consistent with the sleeve, whether the screw threads are intact, clean and the like are checked. If sundries or rust are found, the rust should be cleaned in time. When the steel sleeve is connected and installed, the plastic protective cap is detached, the steel wire heads are mutually propped and aligned, the connecting sleeve is screwed by a pipe wrench, so that the connecting sleeve is screwed into one end of the short wire head from one end of the long wire head, and the connecting sleeve is qualified until the exposed thread at one end of the short wire head is not more than 2P and the exposed thread at one end of the long wire head is not more than L/2+2P.
Step 7), installing a protective layer cushion block on the installed steel bar;
the method comprises the following steps: the installation protection layer cushion blocks are arranged as reinforcing steel bar cushion blocks, and after the reinforcing steel bars are installed, the protection layer cushion blocks are placed again, and the cushion blocks are arranged in a quincuncial shape according to the 1m interval. The cushion block adopts a concrete prefabricated cushion block with the same label, the cushion block adopts binding wires to bind firmly, and the binding wires cannot penetrate into the protective layer inwards. Prevent the steel bar from leaking outwards, reduce the strength of the steel bar and protect the steel bar.
Example 3:
on the basis of embodiment 2, the well wall reinforcing steel bar prefabricating method of the open caisson comprises the following steps:
1) According to the structural size of the well wall of the open caisson and the arrangement form of the steel bars, a steel bar prefabrication pedestal is arranged according to the long side of the well wall of the open caisson;
(2) Processing a prefabricated hoisting stiffness framework, an upper layer of reinforcing steel bar net sheet and a lower layer of reinforcing steel bar net sheet according to a design drawing;
(3) Positioning marks are made on the reinforcement prefabrication pedestal according to the design positions and the intervals of the reinforcement;
(4) Binding a lower layer of reinforcing steel mesh;
(5) A hoisting stiffness framework is arranged on the lower layer of reinforcing steel mesh, and a U-shaped clamping ring is adopted to fix the lower layer of reinforcing steel mesh;
(6) Installing an upper layer of reinforcing steel mesh on the hoisting stiffness framework, and fixing the reinforcing steel mesh with the hoisting stiffness framework by utilizing a U-shaped clamping ring;
(7) And transporting the hoisting stiff framework connected with the upper and lower layers of reinforcing steel meshes to a set position for temporary storage, and temporarily covering geotechnical cloth according to requirements.
The partition wall reinforcement prefabricating method of the open caisson comprises the following steps:
(1) Dividing the open caisson partition wall reinforcement segments according to the open caisson partition wall reinforcement and the size of the access reinforcement structure;
(2) Processing a prefabricated hoisting stiffness framework, an upper layer of reinforcing steel bar net sheet and a lower layer of reinforcing steel bar net sheet according to a design drawing;
(3) Positioning marks are made on the reinforcement prefabrication pedestal according to the design positions and the intervals of the reinforcement;
(4) Binding a lower layer of reinforcing steel mesh;
(5) A hoisting stiffness framework is arranged on the lower layer of reinforcing steel mesh, and a U-shaped clamping ring is adopted to fix the lower layer of reinforcing steel mesh;
(6) Installing an upper layer of reinforcing steel mesh on the hoisting stiffness framework, and fixing the reinforcing steel mesh with the hoisting stiffness framework by utilizing a U-shaped clamping ring;
(7) And transporting the hoisting stiff framework connected with the upper and lower layers of reinforcing steel meshes to a set position for temporary storage, and temporarily covering geotechnical cloth according to requirements.
And (3) transporting and field-installing prefabricated steel bar segments:
(1) Transporting the prefabricated steel bar segments to the site according to the site construction plan;
(2) Hoisting equipment (hoisting weight and hoisting amplitude) is selected, and cables are installed on site;
(3) The hoisting test is carried out before each hoisting, so that the steel bar segments are ensured not to deform during the hoisting, and the steel bars are firmly connected and fixed;
(4) Lifting vertically, translating to an installation position, and lowering the lifting device into position by using cable pulling and manual auxiliary adjustment;
(5) Welding the upright post of the hoisting stiffness framework in the prefabricated steel bar section with an embedded part on the top surface of the open caisson;
(6) The horizontal and vertical steel bars of the prefabricated steel bar segments are connected with each other (the horizontal steel bars of the well wall are connected with the steel bar sleeve, and the vertical steel bars are bound and connected), and cables are required to be temporarily arranged for pulling and fixing before the well lattice is formed.
(7) Horizontal hooking ribs at the joint of the field reinforcing steel bars, and the like.
The invention has the beneficial effects that:
(1) The method is applied to construction engineering of open caisson steel bars of a suspension bridge, after installation and fixation are completed and qualified tests are carried out, after a well wall and a partition wall form a 'well' -shaped or 'T' -shaped stable form, hoisting stiffness framework connection is relieved according to project requirements, and the purposes of energy conservation and environment protection are achieved.
(2) Compared with the traditional construction method of binding reinforcing steel bars on site, the construction method of prefabricating and splicing the open caisson reinforcing steel bar segments can adjust most of the work load on site to the back site, can greatly reduce the work load on site, improve the construction efficiency, realize the turnover use of the hoisting stiff skeleton, save the cost and is a process trend pursued in the field of engineering construction at the present stage, so the process can provide a certain reference for construction and has better economic and social benefits. The construction is safe and reliable, the processing work efficiency is high, the bridge site installation construction period of the steel bars is greatly shortened, the usability is strong, the method is worthy of further popularization in the construction of similar steel bar projects in the future, and the new thought of the steel bar construction method is widened.
In the description of the present invention, it should be understood that, if any, the terms "upper," "lower," and the like indicate an orientation or a positional relationship based on that shown in the drawings, rather than indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus the terms describing the positional relationship in the drawings are merely for illustration and are not to be construed as limiting the invention.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (10)
1. A construction method for prefabricating and assembling open caisson reinforcement bar segments is characterized in that: the method comprises the following steps:
1) Dividing the wall steel bars and partition steel bars of the open caisson into sections;
2) Manufacturing a reinforcing steel bar according to the divided sections;
3) Manufacturing a hoisting stiffness framework of each section;
4) Manufacturing reinforcing steel bar meshes of all the sections;
5) The upper layer and the lower layer of the hoisting stiffness framework of each section are connected with the reinforcing steel bar meshes of the corresponding section, so that prefabrication of reinforcing steel bars of each section is completed;
6) Moving the prefabricated reinforcing steel bars of each section to the divided corresponding sections and installing;
7) And installing a protective layer cushion block on the installed steel bar to finish construction.
2. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 1, wherein the construction method comprises the following steps: and 1) segment division is carried out on the wall steel bars of the open caisson by adopting a long-line matching method.
3. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 2, wherein the construction method comprises the following steps: according to the plane shape, the sections of the open caisson after the division of the wall steel bars comprise a rectangular section, a T-shaped section and an L-shaped section.
4. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 1, wherein the construction method comprises the following steps: and 1) dividing partition wall reinforcing steel bars of the open caisson into sections according to the lengths of the access reinforcing steel bars.
5. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 1, wherein the construction method comprises the following steps: and 2) manufacturing the steel bars by adopting one or more of C12, C16, C20, C25 and C28 steel bars.
6. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 5, wherein the construction method comprises the following steps: during the manufacture, the C25 and C28 steel bars are connected by adopting a rolling straight thread sleeve, and one or more steel bar joints in C12, C16 and C20 are welded or connected in a lap joint mode.
7. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 6, wherein the construction method comprises the following steps: the number of the joints for lengthening the reinforcing steel bars is not more than 50% of the full section at the same section.
8. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 1, wherein the construction method comprises the following steps: the step 1) segment division comprises transverse division and longitudinal division, wherein the transverse division and the longitudinal division are divided into multiple layers; in the longitudinal division, the divided sections are marked as a first section and a second section … nth section in a sequence from bottom to top, the first section is a steel structure open caisson, the second section is installed in a way of installing reinforcing steel bars one by one, the third section to the nth section 1 are installed in a way of adopting the steps 3) to 6), and the nth section is a well cover.
9. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 1, wherein the construction method comprises the following steps: the hoisting stiffness framework comprises a plurality of upright posts (1), parallel joints (2) and inclined struts (3), wherein the upright posts (1) are vertically arranged at intervals, and every two adjacent upright posts (1) are connected with the inclined struts (3) from top to bottom through the parallel joints (2).
10. The construction method for prefabricating and assembling open caisson steel bar segments according to claim 9, wherein the construction method comprises the following steps: lifting lugs are arranged on the hoisting stiff framework.
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