CN111979918A - V-shaped pier combined construction method suitable for marine environment - Google Patents
V-shaped pier combined construction method suitable for marine environment Download PDFInfo
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- CN111979918A CN111979918A CN202010652364.3A CN202010652364A CN111979918A CN 111979918 A CN111979918 A CN 111979918A CN 202010652364 A CN202010652364 A CN 202010652364A CN 111979918 A CN111979918 A CN 111979918A
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- 238000010276 construction Methods 0.000 title claims abstract description 121
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 160
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- 239000004567 concrete Substances 0.000 claims abstract description 128
- 238000000034 method Methods 0.000 claims description 76
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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Abstract
The invention discloses a V-shaped pier combined construction method suitable for marine environment, which adopts a combined construction system of an inverted-triangle steel pipe support, an arch bottom die support frame and a stay buckle cable structure, directly transmits the action of the V-shaped pier during concrete construction to the inverted-triangle steel pipe support through the stay buckle cable and the arch bottom die support frame, and then transmits the action to a V-shaped pier bearing platform base.
Description
Technical Field
The invention relates to the technical field of bridge construction. More particularly, the invention relates to a V-shaped pier combination construction method suitable for a marine environment.
Background
The continuous rigid frame bridge has the characteristics of good structural stress performance, capability of adapting to certain plane linear change, smooth and comfortable driving and small later maintenance workload, and is widely applied to the construction of the traffic engineering in China. However, the spanning capability of the continuous rigid frame bridge is limited, the bearing efficiency of the structure is low after the span reaches 200m, the problems of cracking and downwarping are easy to occur, and the safety of the structure needs to be considered, so that a bridge worker optimizes and provides a new bridge type of the V-shaped pier continuous rigid frame bridge by combining the mechanical characteristics of the arch bridge on the basis of the conventional continuous rigid frame.
A V-shaped pier continuous rigid frame bridge is characterized in that a web plate at the root of a box girder is hollowed in a conventional continuous rigid frame bridge form to form a hollow triangular area with a lower chord lower edge and a solid web girder section lower edge curve which are continuously and smoothly changed. Compared with the traditional bridge structure, the V-shaped pier continuous rigid frame bridge has unique advantages, which are mainly shown in the following three aspects: firstly, the structural stress is reasonable, the span of the V-shaped pier is reduced compared with that of a continuous rigid frame with the same span, the negative bending moment value is greatly reduced, the positive bending moment value is also reduced, the stress of the inclined legs is mainly stressed, and the compressive capacity of concrete can be fully exerted. And secondly, the structural rigidity is greatly improved, and due to the existence of the V-shaped piers, the rigidity of the beam near the fulcrum is greatly improved, so that the deflection of the structure is reduced. And the V-shaped bridge pier has attractive appearance, and the structure has inclined lines besides horizontal lines, so that the bridge is light and attractive, and is particularly suitable for being used in cities and areas with higher landscape requirements.
At present, a V-shaped pier continuous rigid frame bridge is generally constructed by a cantilever method, requirements on machines, fields and transportation conditions are low, and the overall construction method of the upper structure of the existing V-shaped pier rigid frame bridge is generally that the construction of a hollow area is firstly carried out, after the upper chord and the lower chord are converged, the V-shaped pier continuous rigid frame bridge is transferred to a hanging basket of a conventional solid web girder section for symmetrical pouring until closure is completed, and the construction of the upper structure is finally completed. The construction method is generally similar to that of a conventional continuous rigid frame bridge, and is different from the implementation of the V-shaped pier in the open-web area. The existing V-shaped pier construction methods mainly comprise the following 4 types: the method comprises a double-layer hanging basket double-layer buckling and hanging construction method, a lower chord buckling and hanging combined upper chord support beam section cast-in-place method, a lower chord buckling and hanging combined support supported upper chord hanging basket suspension casting method and a lower chord buckling and hanging combined upper chord support integral cast-in-place method.
The 4V-shaped pier construction methods have the characteristics, but the applicability of the V-shaped pier continuous rigid frame bridge construction method in other complex environments is not considered. If the bridge structure is located in an open sea environment, adverse conditions such as water depth, large wind and wave are considered, the construction efficiency and safety of the existing construction method are difficult to guarantee, and the existing construction process is relatively immature after analysis of overall construction organization, temporary facilities, field conditions, technical risks, construction period, cost and the like through investigation and scheme comparison.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a V-shaped pier combination construction method suitable for marine environment, so as to solve the technical problem that the construction efficiency and safety are difficult to guarantee under the adverse conditions of water depth, large wind and wave and the like in the conventional V-shaped pier continuous rigid frame bridge construction method.
In order to achieve the purposes and other advantages, the invention provides a V-shaped pier combination construction method suitable for a marine environment, which is characterized in that a steel pipe support in an inverted triangle shape is erected on a V-shaped pier bearing platform base, then a bottom die support frame is erected on the steel pipe support, and a plurality of combined support systems for diagonal draw buckle cables are arranged on two sides of the steel pipe support in the transverse bridge direction to support and cast in situ the V-shaped piers.
Preferably, the process of cast-in-place supporting the V-pier comprises the following steps:
s1, embedding positioning supports and fixing pieces on two sides of the V-shaped pier bearing platform base, binding embedded steel bars and prestressed bundles through the positioning supports in a positioning mode, enabling the pouring direction of an embedded section to be consistent with the inclination direction of the V-shaped pier, then pouring the embedded section of the V-shaped pier bearing platform base, and installing first section bearing platforms on two sides of the V-shaped pier bearing platform base respectively;
s2, dividing a V-shaped pier construction area into five sections from No. I to No. V according to a construction sequence, and pouring concrete in the five sections sequentially, wherein the No. I, the No. II, the No. III and the No. V are respectively and symmetrically arranged on two sides of a V-shaped pier bearing platform base, the No. IV is positioned above the V-shaped pier bearing platform base, firstly, erecting a steel pipe support on the embedded section to enable the lower end of the steel pipe support to be fixedly connected with a fixing piece, installing a bottom mould support frame on the upper end of the steel pipe support corresponding to the No. II section, then, respectively and obliquely and downwards installing 1 group of first stay cables on two sides of the two ends of the steel pipe support in the transverse bridge direction, anchoring the lower end of each first stay cable on a first section of bearing platform, and symmetrically performing formwork erection construction on the two No. I sections by adopting a post-tensioning method after all the first stay cables are tensioned;
s3, respectively installing a second section of bearing platform and a third section of bearing platform corresponding to the No. two and No. three sections, respectively installing 1 group of second stay cables obliquely downwards at two ends of the steel pipe bracket at two sides of the transverse bridge direction, respectively, anchoring the lower end of each second stay cable on the second section of bearing platform, then installing templates of the No. two and No. three sections, and tensioning all the second stay cables;
s4, mounting a first anchor rod on the concrete of the first segment, symmetrically performing formwork pouring construction on the two second segments by adopting a post-tensioning method, and mounting 1 group of third outer stayed-cable buckling cables at two ends of the steel bar support at two sides of the transverse bridge in an inclined downward mode respectively;
s5, respectively and obliquely downwards installing 1 group of third inner stayed guy cables at two ends of the steel pipe support in the transverse bridge direction, then performing first tensioning on the third outer stayed guy cables and the third inner stayed guy cables, dismantling a first anchor rod, installing a second anchor rod on the concrete of No. two segments, and symmetrically performing formwork erection and pouring construction on the concrete of No. three segments by adopting a post-tensioning method;
s6, adopting a post-tensioning method to carry out formwork-supporting pouring construction on the No. IV section;
and S7, tensioning the third outer stay buckle cable and the third inner stay buckle cable for the second time, symmetrically performing formwork erection casting construction on the fifth two sections by adopting a post-tensioning method, and finally casting and molding concrete of the fifth sections from the fifth section to obtain the V-shaped pier.
Preferably, when the post-tensioning method is adopted for formwork-erecting pouring construction of concrete, the prestressed tendon anchoring end is installed in the pre-embedded section in advance, when construction of the corresponding section is carried out, pre-embedded steel bars are bound firstly, then a template is installed, then the prestressed tendon of the corresponding section is installed along the prestressed tendon anchoring end, then concrete is poured, and finally the prestressed tendon of the corresponding section is tensioned and grouting is carried out.
Preferably, the pouring time interval of the concrete of two sections constructed in sequence is not more than 7 days, the process of binding the embedded steel bars of the section III and the section IV is carried out simultaneously, and the prestressed tendons are tensioned and lengthened simultaneously in the process of tensioning the prestressed tendons of each section.
Preferably, in the construction process of the first two segments and the second two segments of the V-shaped pier, temporary prestressed tendons are respectively distributed on the top surface and the bottom surface of the concrete to be poured, and the concrete is symmetrically tensioned after being poured.
Preferably, when the first stay buckle cable, the second stay buckle cable, the third inner stay buckle cable and the third outer stay buckle cable are tensioned, the tensioning adjusting end is arranged on the steel pipe support, and the first stay buckle cable, the second stay buckle cable, the third inner stay buckle cable and the third outer stay buckle cable which are positioned at two sides along the bridge direction are symmetrically tensioned and adjusted by a jack.
Preferably, the steel pipe support comprises a plurality of vertical steel stand columns, oblique steel stand columns and horizontal steel stand columns, when the steel pipe support is installed, the vertical steel stand columns are uniformly distributed in the center of the V-shaped pier bearing platform base, the lower ends of the vertical steel stand columns are fixedly welded with the fixing piece, and then the oblique steel stand columns and the horizontal steel stand columns are installed between the vertical steel stand columns.
Preferably, when the steel pipe support is erected, a plurality of stress strain gauges are installed on the top surface of the vertical steel upright column and used for monitoring the stress condition of the steel pipe support, and the installation points of the stress strain gauges are not less than 10 and are uniformly arranged on two sides of the steel pipe support in the bridge direction.
Preferably, the method further comprises a crack prevention control method using at least any one of the casting concretes A, B, C, D, E, F, G, wherein,
the control method A comprises the steps of screening raw materials according to slump when the raw materials for mixing concrete are selected, so that the slump of the prepared concrete before pouring is 180-200 mm;
the control method B is that when the mixed raw materials of the concrete are transported, the heat insulation and sun shading are carried out, a sun-proof shed is built on a raw material stacking site, and the insolation time of the raw materials of the concrete is reduced;
the control method C is that water added before the concrete is mixed is normal temperature water, and water added in the mixing process is ice blocks;
the control method D is characterized in that concrete pouring construction is arranged in the morning and evening or at night, layered pouring is carried out when concrete is poured, the pouring thickness of each layer is controlled to be 30-40 cm, and the pouring process is carried out uniformly and slowly;
the control method E is characterized in that a plurality of temperature measuring elements are pre-embedded before concrete is poured and used for measuring and monitoring temperature indexes of a core part, a surface layer and an external environment of the poured concrete, and meanwhile, flexible conductive materials are distributed on No. four section concrete for crack monitoring;
the control method F is to carry out maintenance hot air sac maintenance after the concrete pouring of each segment is finished, so that the poured concrete is slowly cooled;
and the control method G is that a layer of cooling water pipe is respectively arranged on the top surface and the bottom surface of the No. one section and the No. two sections, and cooling water is introduced into the cooling water pipes after concrete pouring is finished.
Preferably, the method also comprises the following steps: when the formwork-erecting pouring construction of concrete is carried out, all embedded steel bars adopt epoxy steel bars, the surfaces of the epoxy steel bars are coated with rust inhibitor, the concrete of each section is maintained after the pouring is finished, all sections are coated with fair-faced concrete after the maintenance is finished, and the densities of the fair-faced concrete serving as intermediate paint and finish paint during the coating are 150g/m3。
The invention at least comprises the following beneficial effects: the V-shaped pier combined construction method suitable for the marine environment adopts the inverted-triangular steel pipe support, the arched bottom die support and the inclined pull buckle cable structure combined construction system, the effect of the V-shaped pier during concrete construction is directly transmitted to the inverted-triangular steel pipe support through the inclined pull buckle cable and the arched bottom die support, and then is transmitted to the V-shaped pier bearing platform base.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of construction of an embedded section of a V-shaped pier bearing platform base of the invention;
FIG. 2 is a schematic structural diagram of the construction of section No. 1;
FIG. 3 is a schematic structural diagram of the number II segment construction of the present invention;
FIG. 4 is a schematic structural diagram of the construction of the third and fourth segments of the present invention;
FIG. 5 is a schematic structural view of the fifth segment construction of the present invention;
FIG. 6 is a top view structural view of the temporary tendon arrangement of the top surfaces of the No. 1 segment and the No. 6 segment of the present invention;
FIG. 7 is a top view structural view of the arrangement of temporary tendons of the bottom surfaces of the No. 1 segment and the No. 7 segment of the present invention;
fig. 8 is a top view structural view of the cooling water pipe arrangement of the present invention.
The specification reference numbers indicate: 1. v type mound cushion cap base, 2, locating support, 3, mounting, 4, pre-buried section, 5, first section load-bearing platform, 6, vaulting pole, 7, steel pipe support, 8, die block support frame, 9, first oblique pull buckle cable, 10, second section load-bearing platform, 11, third section load-bearing platform, 12, second oblique pull buckle cable, 13, first stock, 14, third outer oblique pull buckle cable, 15, interim prestressing tendons, 16, vertical steel stand, 17, oblique steel stand, 18, horizontal steel stand, 19, condenser tube.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The invention provides a V-shaped pier combined construction method suitable for marine environment, which adopts a combined construction system of an inverted-triangle steel pipe support, an arch bottom die support frame and a stay buckle cable structure, directly transmits the action of the V-shaped pier during concrete construction to the inverted-triangle steel pipe support through the stay buckle cable and the arch bottom die support frame, and then transmits the action to a V-shaped pier bearing platform base. In the figure, the transverse direction is along the bridge direction, and the longitudinal direction is along the bridge direction.
Example 1:
the construction method of the V-shaped pier combination construction method suitable for the marine environment comprises the following construction steps:
firstly, as shown in fig. 1, the construction of the embedded section 4 on the V-shaped pier bearing platform base 1 is carried out, two inclined support legs corresponding to the lower end of the V-shaped pier are embedded into the positioning support 2 made of the i-shaped 32 steel, embedded steel bars and prestressed bundles in the embedded section 4 are guided and fixed, then the position of the paying-off positioning embedded steel bars is measured, the embedded steel bars are bound on the positioning support 2, the anchoring end of the V-shaped pier prestressed bundles are installed at the same time, a plurality of fixing pieces 3 are embedded corresponding to the position of the lower end of the subsequent steel pipe support 7, then the embedded section 4 is subjected to concrete pouring, and the prestressed bundles are lengthened to the outside of the concrete of the embedded section 4.
And secondly, as shown in fig. 2, preparing for the construction of the section (i) with the V-shaped pier. The two sides of the V-shaped pier bearing platform base 1 in the transverse bridge direction are respectively provided with a support rod 6, the support rods 6 and the adjacent fixing pieces 3 are respectively used as support and fixing structures to install the first section bearing platform 5, and the subsequent construction of the V-shaped pier at the section I is anchored to bear and assist in guiding the construction direction. Meanwhile, a steel pipe support 7 in an inverted triangle shape is erected on the embedded section 4 on the V-shaped pier bearing platform base 1, the center of the steel pipe support 7 and the center of the V-shaped pier bearing platform base 1 are located on the same vertical surface, then the lower end of the steel pipe support 7 is fixed on the embedded section 4 by using the embedded fixing piece 3 in the first step, and therefore the steel pipe support 7 can transmit stress to the V-shaped pier bearing platform base 1 through the fixing piece 3. Meanwhile, the bottom die support frame 8 can be installed on the upper end of the steel pipe support 7 corresponding to the No. four segment, construction efficiency is improved, the shape characteristics of a pier are improved, the bottom die support frame 8 is arched, a bottom die cushion block is installed on the steel pipe support 7 when the bottom die support frame 8 is installed, leveling is conducted through the bottom die cushion block, the bottom die support frame 8 is installed above the cushion block, and therefore the bottom die support frame 8 can transmit stress to the steel pipe support 7.
And thirdly, performing construction in the No. segment on the first section of the bearing platform 5 by combining the structure shown in the figure 2. Firstly, binding the embedded steel bars in the first segment in the direction of the embedded steel bars of the embedded segment 4, then installing a template of concrete to be poured in the first segment, limiting the shape and pouring boundary of the concrete, lengthening the prestressed bundles of the embedded segment 4 through a steel strand connector, installing the prestressed bundles in the first segment, meanwhile, installing 1 group of first stay cables 9 obliquely downwards at the two sides of the steel pipe bracket 7 in the transverse bridge direction corresponding to the position of the first bearing platform 5 respectively, anchoring the lower ends of the first stay cables 9 on the first bearing platform 5, then removing the stay bars 6, tensioning 2 groups of first stay cables 9, arranging a tensioning adjusting end on the steel pipe bracket 7 during tensioning, symmetrically tensioning and adjusting the 2 groups of first stay cables 9 by a jack, and then symmetrically pouring concrete in the two sections I, and stretching the prestressed bundles in the sections I and grouting by using the installation steel strand connectors after pouring.
The inclined stay buckle cables can transmit the bearing pressure and the like constructed on the first section of bearing platform 5 to the steel pipe support 7, the control capability of concrete construction in the section area I is improved, the construction safety of the corresponding sections of the V-shaped pier is ensured, the stay bars 6 are dismantled to transfer the stress of the section I to the first inclined stay buckle cables 9, and the concrete of the section I is prestressed and tensioned after pouring is finished to cope with the subsequent load of a concrete structure.
In order to ensure the supporting capacity of the steel pipe support 7, the steel pipe support 7 comprises a plurality of vertical steel upright columns 16, oblique steel upright columns 17 and horizontal steel upright columns 18, when the steel pipe support 7 is installed, the vertical steel upright columns 16 are uniformly distributed at the center of the V-shaped pier bearing platform base 1, the lower ends of the vertical steel upright columns 16 are fixedly welded with the fixing pieces 3, and then the oblique steel upright columns 17 and the horizontal steel upright columns 18 are installed between the vertical steel upright columns 16.
According to design requirements, all components of the steel pipe support 7, namely a vertical steel upright 16, an inclined steel upright 17, a horizontal steel upright 18 and the like, are manufactured in a factory, the components are conveyed to a site for assembly after being processed, a temporary pile cap is welded at the top opening of each component, two ends of the horizontal steel upright 18 are cut into notches to be processed into Harvard joints, the tightness of the steel pipe support 7 is guaranteed, seawater is prevented from entering the steel pipe support 7, when the steel pipe support 7 is installed, the vertical steel upright 16 is installed at the center of a bearing platform, and the lower end of the vertical steel upright 16 is firmly welded with a pre-embedded fixing piece 3 such as a steel plate. Then, oblique steel upright posts 17 and horizontal steel upright posts 18 are arranged between the vertical steel upright posts 16 along the transverse bridge direction and the longitudinal bridge direction, so that the integral rigid supporting strength of the steel pipe support 7 is ensured, and the stress is vertically transmitted to the V-shaped pier bearing platform base 1 through the vertical steel upright posts 16.
After the steel pipe support 7 is set up, the steel pipe support 7 is pre-pressed. The intensive no surcharge space of reinforcing bar, so adopt jack equivalent construction load to carry out whole pre-compaction to steel pipe support 7, carry out the pre-compaction in grades to steel pipe support 7, can reach following several effects through the pre-compaction: the safety of the support is tested, the elastic deformation of the support under the action of each stage of static pre-pressing load is measured, whether the rigidity of the support meets the design requirements or not is measured, and the vertical mold elevation and the pre-camber of the support are determined; eliminating inelastic deformation of the stent.
And fourthly, construction in the No. II section is carried out by combining the structure shown in the figure 3. And a second section of bearing platform 10 is arranged in a construction area corresponding to the No. two sections, 1 group of second stay buckle cables 12 are respectively arranged on two sides of the steel pipe bracket 7 in the transverse bridge direction corresponding to the second section of bearing platform 10 in an inclined downward mode, the lower end of each second stay buckle cable 12 is anchored on the second section of bearing platform 10, and the bearing platform and the stay buckle cables are matched to provide supporting and controlling capacity for the concrete formwork pouring construction in the No. two sections so as to ensure the construction safety of the sections corresponding to the V-shaped piers. And 2 groups of second diagonal bracing cables 12 are tensioned, a tensioning adjusting end is arranged on the steel pipe support 7 during tensioning, a jack is adopted to symmetrically tension and adjust the 2 groups of second diagonal bracing cables 12, then pre-embedded steel bars in the No. segment are bound, a template to be poured with concrete is installed, a prestress beam is continuously connected to the tail end of the prestress beam in the No. segment to serve as the prestress beam of the No. segment, in addition, a first anchor rod 13 is installed on the concrete poured in the No. segment to fix and ensure the stability in the subsequent process of tensioning the prestress beam, and the concrete of the No. segment can uniformly and completely transmit stress to a first bearing platform to be stable and tightly connected with the No. segment. And then symmetrically pouring concrete in the two No. two segments, installing a steel strand connector after pouring, tensioning the prestressed bundles in the No. two segments and grouting.
And fifthly, constructing in the No. three sections by combining the steps shown in figure 4. Installing a third section of bearing platform 11 corresponding to the construction area of the No. three section, installing 1 group of third outer stay buckle cables 14 at two ends of the steel pipe bracket 7 corresponding to the third section of bearing platform 11 at two sides of the transverse bridge direction in a slanting and downward way respectively, supporting and controlling the concrete construction of the No. three section, anchoring the lower end of each third outer stay buckle cable 14 on the third section of bearing platform 11, binding embedded steel bars of concrete to be poured in the No. three section, installing 1 group of third inner stay buckle cables at two ends of the steel pipe bracket 7 corresponding to the third section of bearing platform 11 at two sides of the transverse bridge direction respectively in a downward way, increasing the distance from the V-shaped pier bearing platform base 1 when constructing the No. three section, needing to provide larger supporting pressure for the No. 1, No. two and No. three outer buckle cables, and setting the third inner stay buckle cables 14 to enhance the control and bearing capacity of the subsequent stay cables, and then, tensioning a third outer oblique stay buckle cable 14 and a third inner oblique stay buckle cable on a steel pipe support 7, arranging a tensioning adjusting end on the steel pipe support 7 during tensioning, symmetrically tensioning and adjusting the third outer oblique stay buckle cable 14 and the third inner oblique stay buckle cable by adopting a jack, then installing a prestressed bundle, a prestressed corrugated pipe and a template of concrete to be poured in the No. section in combination with the No. section, removing the first anchor rod 13, installing the second anchor rod, starting symmetrically pouring the concrete in the two No. sections, installing a steel stranded wire connector after pouring, tensioning the prestressed bundle in the No. section and grouting. And then, mounting prestressed steel strands in the prestressed corrugated pipe, symmetrically tensioning and then grouting.
And sixthly, constructing in a section (four) by combining the steps shown in figure 4. And binding concrete embedded steel bars in No. four sections in sequence, and installing a template and transverse and longitudinal prestressed tendons. When the formwork is installed, the outer side formwork is firstly installed, the outer side formwork is fixed on a bottom formwork support frame 8 through temporary section steel, a scaffold pipe support is erected to support the flange of the outer side formwork, after web steel bars are bound, an inner chamfer formwork and an inner side formwork are installed, the inner side formwork and the outer side formwork are fixed in a split-drawing mode through finish-rolled deformed steel bars, an inner top formwork is erected after the scaffold pipe support is installed, the whole formwork is installed, after the embedded steel bars are bound, concrete in No. four sections is symmetrically poured along the direction of a bridge, after pouring is completed, a steel strand connector is installed, and prestress bundles in No. four sections are stretched and pressed into grout.
Seventh, as shown in fig. 5, the construction in the section is performed. Firstly, installing an outer side template of concrete to be poured of a fifth section, namely a main beam template of which the V-shaped pier is positioned at the top end, adjusting elevation of a vertical mold, then carrying out secondary tensioning on a third outer stay buckle cable 14 and a third inner stay buckle cable, binding embedded steel bars in the fifth section, then installing an inner side template of the concrete to be poured, installing prestressed pipelines of a top plate, a web plate and a partition plate, symmetrically pouring the concrete in the fifth section, after pouring is finished, installing prestressed steel strand bundles in each prestressed pipeline, and finally tensioning and grouting each prestressed steel strand bundle in the fifth section. And after the concrete pouring construction of the whole V-shaped pier is completed, carrying out anti-corrosion treatment on the V-shaped pier.
Example 2
The utility model provides a V type mound combination construction method suitable for marine environment, in the work progress in No. three sections and No. four sections, the ligature process of the embedded steel bar in No. three sections and the embedded steel bar in No. four sections is gone on in step, in the work progress in every section, the limit stretch-draw side is long when carrying out the stretch-draw to the prestressing tendons, the pouring time interval of the concrete of two sections of each construction in proper order is no longer than 7 days, under the limited operating space of the section construction that corresponds to adaptation V type mound, can guarantee construction quality, promote the efficiency of construction, all the other construction steps are the same with embodiment 1.
Example 3
A V-shaped pier combined construction method suitable for an ocean environment is characterized in that temporary prestressed tendons 15 are additionally distributed on the top surface and the bottom surface of concrete to be poured in a first segment and a second segment respectively in the construction process of the first segment and the second segment, then the temporary prestressed tendons 15 in the corresponding segments are symmetrically tensioned when the prestressed tendons on two sides of a transverse bridge are tensioned, and other construction steps are the same as those in embodiment 1. The temporary prestressed tendons 15 are respectively distributed in the areas where the top surfaces of the first section and the second section of the V-shaped pier are in contact with seawater and are easy to crack due to large bearing load, and the direction of the temporary prestressed tendons 15 is consistent with the inclination direction of the first section and the second section, so that concrete cracking in the construction period can be further prevented.
Example 4
A V-shaped pier combination construction method suitable for a marine environment is characterized in that when a steel pipe support 7 is erected, a plurality of stress strain gauges are installed on the top surface of a vertical steel upright post 16 and used for monitoring the stress condition of the steel pipe support 7, the installation points of the stress strain gauges are not less than 10 and are evenly arranged on two sides, located along the bridge direction, of the steel pipe support 7, and other steps are the same as those in embodiment 1. Under the combined action of a plurality of external causes and internal causes, the whole and local stress of the steel pipe support 7 is complex in the construction process, in order to eliminate uncertainty in the concrete construction process, the stress condition of the steel pipe support 7 is monitored in real time, the measured data is fed back through the monitoring data, whether the local part of the steel pipe support 7 is eccentric or not is analyzed, whether the local load meets the design requirements or not is judged, whether the whole stress is balanced or not is judged, and the construction safety and the construction quality are ensured.
Example 5
A V-shaped pier combined construction method suitable for marine environment is characterized in that in the construction process from the first step to the seventh step, a plurality of anti-cracking control methods for pouring concrete are also arranged, wherein,
the control method A comprises the steps of firstly optimizing the mix proportion of concrete, preferably selecting a polycarboxylic acid high-performance water reducing agent with good retarding and slump retaining performances by adopting a cementing material system with low heat of hydration, reducing the early hydration rate of the concrete, enabling the concrete to meet the technical requirements of early strength retarding, strong workability, good working performance and the like, improving the aggregate gradation of the concrete on the premise of meeting the design requirements, adding admixtures such as fly ash or ground slag and the like, fully utilizing the later strength of the admixtures, reducing the total amount of the cementing material, improving the workability and cohesiveness of the concrete, and generally selecting raw materials with lower slump to enable the slump of the prepared concrete before pouring to be between 180 and 200mm, thereby being beneficial to reducing the water consumption of the concrete, reducing the dry shrinkage and improving the crack resistance;
in the control method B, when the mixed raw materials of the concrete are transported, heat insulation and sun shading are carried out, a sun-proof shed is built for a raw material stacking site, the insolation time of the raw materials of the concrete is reduced, and the overhigh temperature caused by the mixing of the concrete is prevented;
in the control method C, in the concrete preparation process, the function of controlling the pouring temperature is achieved by adding crushed ice blocks and normal-temperature water or ice water, so that the in-situ pouring temperature can be well controlled;
the control method D comprises the steps of arranging concrete pouring construction in the morning and evening or at night, carrying out layered pouring when pouring concrete, controlling the pouring thickness of each layer to be 30-40 cm, uniformly and slowly carrying out the pouring process, and uniformly controlling the pouring process of the concrete to enable hydration heat to be dissipated as much as possible;
according to the control method E, a temperature measuring element is pre-embedded before pouring, so that the highest temperature rise, the temperature difference between a core part and a surface layer, the cooling rate and the ambient temperature in the pouring process can be reflected really conveniently after the pouring of concrete is finished, the monitoring is conveniently carried out after the pouring of the concrete temperature is finished, a flexible conductive material is distributed on the No. four section concrete, the distributed crack monitoring is carried out on the construction process, whether cracks are generated or not and the change of the cracks are known at any time, and a worker can take relevant measures conveniently in time;
the control method F adopts hot air sac maintenance, the hot air sac maintenance method generally adopts the steps that the hot air sac is paved on the surface of concrete, a closed space is formed on the surface of the hot air sac concrete, then maintenance gas is filled into the hot air sac, and the temperature and the humidity of the maintenance gas are adjusted and controlled, so that the poured concrete is slowly cooled, the creep characteristic of the poured concrete is fully exerted, and the temperature stress is reduced;
according to the structural characteristics of the V-shaped pier, the top surfaces and the ground of the concrete in the first section and the second section frequently contact with seawater and are corroded and loaded greatly, a layer of cooling water pipe 19 is arranged on each of the top surfaces and the ground of the concrete in the first section and the second section, and cooling water is introduced after the concrete is poured as shown in fig. 8, so that the purposes of reducing temperature peaks and reducing the temperature stress of the concrete are achieved.
The multiple anti-cracking control methods for the poured concrete control the pouring preparation and the pouring process of the concrete, reduce the temperature of the pouring process, and have good control effect on preventing the concrete from cracking, so that the construction quality of the V-shaped pier concrete is ensured, and the construction safety is ensured
Example 6
A V-shaped pier combined construction method suitable for a marine environment comprises an anticorrosion method for pouring concrete in a construction process, when formwork pouring construction of the concrete is carried out, all embedded steel bars adopt epoxy steel bars, rust inhibitors are coated on the surfaces of the epoxy steel bars, maintenance is carried out after concrete pouring of each section is finished, all the concrete is coated by fair-faced concrete after the maintenance is finished, and the densities of the fair-faced concrete serving as intermediate paint and finish paint during coating are 150g/m3. The other construction steps were the same as in example 1. The anticorrosion measures of the epoxy steel bar, the steel bar rust inhibitor and the clear water concrete coating are adopted, so that the durability of the concrete can be obviously improved, and the concentration content of chloride ions in the concrete structure is reduced.
The invention relates to a V-shaped pier combined construction method suitable for marine environment, which utilizes the structural characteristics of V-shaped piers to construct, innovatively adopts an optimized lower chord buckling-hanging combined upper chord support integral cast-in-place method, divides a V-shaped pier triangular area into five sections from No. I to No. V according to the construction sequence, and carries out symmetrical five-time casting molding, a steel pipe support in an inverted triangle shape is arranged in the lower end triangular area of the V-shaped pier, a bottom mold support frame is arranged at the upper end of the steel pipe support, a plurality of groups of stay cables are respectively arranged at two ends of the steel pipe support corresponding to the sections for construction, so that the sections from No. I, No. II and No. III are cast-in-place through stay cable supports corresponding to the sections, the section from No. IV is combined with the bottom mold support frame for cast-in-place support, the section from No. V-shaped pier for concrete construction is finally cast-in-place, the section from the bottom mold support frame and the stay cables to, then transmit to V type mound cushion cap base by the steel pipe support, the structural design of whole construction is succinct, and the atress is clear and definite, has reduced the technical risk, and it is convenient to be under construction, has guaranteed the time limit for a project, combines load-bearing platform etc. again, not only satisfies the bearing capacity of V type mound construction, still provides multiple control and supporting measure for V type mound construction, has guaranteed V type mound construction safety, can be applied to abominable marine construction environment occasion such as depth of water and stormy waves well.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. The V-shaped pier combined construction method suitable for the marine environment is characterized in that an inverted-triangle-shaped steel pipe support is erected on a V-shaped pier bearing platform base, a bottom die support frame is erected on the steel pipe support, and a plurality of combined support systems for diagonal draw buckle cables are arranged on two sides of the steel pipe support in the transverse bridge direction to support and cast in situ the V-shaped piers.
2. The method for constructing the V-shaped pier combination suitable for the marine environment as claimed in claim 1, wherein the process of carrying out support cast-in-place on the V-shaped pier comprises the following steps:
s1, embedding positioning supports and fixing pieces on two sides of the V-shaped pier bearing platform base, binding embedded steel bars and prestressed bundles through the positioning supports in a positioning mode, enabling the pouring direction of an embedded section to be consistent with the inclination direction of the V-shaped pier, then pouring the embedded section of the V-shaped pier bearing platform base, and installing first section bearing platforms on two sides of the V-shaped pier bearing platform base respectively;
s2, dividing a V-shaped pier construction area into five sections from No. I to No. V according to a construction sequence, and pouring concrete in the five sections sequentially, wherein the No. I, the No. II, the No. III and the No. V are respectively and symmetrically arranged on two sides of a V-shaped pier bearing platform base, the No. IV is positioned above the V-shaped pier bearing platform base, firstly, erecting a steel pipe support on the embedded section to enable the lower end of the steel pipe support to be fixedly connected with a fixing piece, installing a bottom mould support frame on the upper end of the steel pipe support corresponding to the No. II section, then, respectively and obliquely and downwards installing 1 group of first stay cables on two sides of the two ends of the steel pipe support in the transverse bridge direction, anchoring the lower end of each first stay cable on a first section of bearing platform, and symmetrically performing formwork erection construction on the two No. I sections by adopting a post-tensioning method after all the first stay cables are tensioned;
s3, respectively installing a second section of bearing platform and a third section of bearing platform corresponding to the No. two and No. three sections, respectively installing 1 group of second stay cables obliquely downwards at two ends of the steel pipe bracket at two sides of the transverse bridge direction, respectively, anchoring the lower end of each second stay cable on the second section of bearing platform, then installing templates of the No. two and No. three sections, and tensioning all the second stay cables;
s4, mounting a first anchor rod on the concrete of the first segment, symmetrically performing formwork pouring construction on the two second segments by adopting a post-tensioning method, and mounting 1 group of third outer stayed-cable buckling cables at two ends of the steel bar support at two sides of the transverse bridge in an inclined downward mode respectively;
s5, respectively and obliquely downwards installing 1 group of third inner stayed guy cables at two ends of the steel pipe support in the transverse bridge direction, then performing first tensioning on the third outer stayed guy cables and the third inner stayed guy cables, dismantling a first anchor rod, installing a second anchor rod on the concrete of No. two segments, and symmetrically performing formwork erection and pouring construction on the concrete of No. three segments by adopting a post-tensioning method;
s6, adopting a post-tensioning method to carry out formwork-supporting pouring construction on the No. IV section;
and S7, tensioning the third outer stay buckle cable and the third inner stay buckle cable for the second time, symmetrically performing formwork erection casting construction on the fifth two sections by adopting a post-tensioning method, and finally casting and molding concrete of the fifth sections from the fifth section to obtain the V-shaped pier.
3. The V-shaped pier combination construction method suitable for the marine environment as claimed in claim 2, wherein when the post-tensioning method is adopted for formwork pouring construction of concrete, the prestressed tendon anchoring end is installed in the pre-embedded section in advance, when construction of the corresponding section is carried out, pre-embedded steel bars are firstly bound, then a formwork is installed, then prestressed tendons of the corresponding section are installed along the prestressed tendon anchoring end, then concrete is poured, and finally the prestressed tendons of the corresponding section are tensioned and grouted.
4. The combined construction method of the V-shaped piers suitable for the marine environment as claimed in claim 3, wherein the time interval of pouring the concrete of two sections constructed in sequence is not more than 7 days, the process of binding the embedded steel bars of No. three sections and No. four sections is simultaneously performed, and the process of stretching the prestressed bundles of each section is performed while stretching the prestressed bundles.
5. The combined construction method of the V-shaped pier suitable for the marine environment as claimed in claim 3, wherein during the construction of the two sections (i) and two sections (ii) of the V-shaped pier, temporary prestressed tendons are respectively laid on the top and bottom surfaces of the concrete to be poured, and the concrete is symmetrically tensioned after being poured.
6. The method of claim 2, wherein when the first, second, third, and third outer stay cables are tensioned, the tensioning adjustment ends are installed on the steel pipe bracket, and the first, second, third, and third inner stay cables are symmetrically tensioned and adjusted by a jack.
7. The V-shaped pier combination construction method suitable for the marine environment as claimed in claim 2, wherein the steel pipe support comprises a plurality of vertical steel columns, oblique steel columns and horizontal steel columns, when the steel pipe support is installed, the vertical steel columns are uniformly distributed at the center of the V-shaped pier bearing platform base, the lower ends of the vertical steel columns are welded and fixed with the fixing piece, and then the oblique steel columns and the horizontal steel columns are installed between the vertical steel columns.
8. The combined construction method of the V-shaped piers suitable for the marine environment as claimed in claim 7, wherein when the steel pipe support is erected, a plurality of stress strain gauges are installed on the top surface of the vertical steel upright column for monitoring the stress condition of the steel pipe support, and the installation points of the stress strain gauges are not less than 10 and are evenly arranged on two sides of the steel pipe support along the bridge direction.
9. The method of assembling V-shaped piers for marine use of claim 2, further comprising a crack prevention control method using at least one of the cast concretes of A, B, C, D, E, F, G, wherein,
the control method A comprises the steps of screening raw materials according to slump when the raw materials for mixing concrete are selected, so that the slump of the prepared concrete before pouring is 180-200 mm;
the control method B is that when the mixed raw materials of the concrete are transported, the heat insulation and sun shading are carried out, a sun-proof shed is built on a raw material stacking site, and the insolation time of the raw materials of the concrete is reduced;
the control method C is that water added before the concrete is mixed is normal temperature water, and water added in the mixing process is ice blocks;
the control method D is characterized in that concrete pouring construction is arranged in the morning and evening or at night, layered pouring is carried out when concrete is poured, the pouring thickness of each layer is controlled to be 30-40 cm, and the pouring process is carried out uniformly and slowly;
the control method E is characterized in that a plurality of temperature measuring elements are pre-embedded before concrete is poured and used for measuring and monitoring temperature indexes of a core part, a surface layer and an external environment of the poured concrete, and meanwhile, flexible conductive materials are distributed on No. four section concrete for crack monitoring;
the control method F is to carry out maintenance hot air sac maintenance after the concrete pouring of each segment is finished, so that the poured concrete is slowly cooled;
and the control method G is that a layer of cooling water pipe is respectively arranged on the top surface and the bottom surface of the No. one section and the No. two sections, and cooling water is introduced into the cooling water pipes after concrete pouring is finished.
10. The method for constructing the V-shaped pier combination suitable for the marine environment as claimed in claim 3, further comprising an anticorrosion method for pouring concrete: when the formwork-erecting pouring construction of concrete is carried out, all embedded steel bars adopt epoxy steel bars, the surfaces of the epoxy steel bars are coated with rust inhibitor, the concrete of each section is maintained after the pouring is finished, all sections are coated with fair-faced concrete after the maintenance is finished, and the densities of the fair-faced concrete serving as intermediate paint and finish paint during the coating are 150g/m3。
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