CN112227416A - Construction method of assembled steel pipe support and distribution beam combined support - Google Patents
Construction method of assembled steel pipe support and distribution beam combined support Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 146
- 239000010959 steel Substances 0.000 title claims abstract description 146
- 238000010276 construction Methods 0.000 title claims abstract description 80
- 238000009826 distribution Methods 0.000 title claims abstract description 39
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 13
- 239000004567 concrete Substances 0.000 claims description 68
- 239000000463 material Substances 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 7
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 238000010408 sweeping Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 3
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- 239000010410 layer Substances 0.000 description 21
- 238000009434 installation Methods 0.000 description 10
- 238000009415 formwork Methods 0.000 description 9
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- E—FIXED CONSTRUCTIONS
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- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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Abstract
The invention discloses a construction method of an assembled steel pipe support and a distributing beam combined support, and relates to the technical field of construction in a rail transit tunnel; the method comprises the steps of pouring steel pipe strut foundations on two sides of a TBM (tunnel boring machine) transportation track, determining the height of a steel pipe strut according to the maximum passing height of a TBM railcar and the construction space of a rail top air channel, fixing the steel pipe strut to the steel pipe strut foundations, fixedly welding a main cross beam at the central line position of the top of the steel pipe strut, arranging a welding distribution beam above the main cross beam according to the longitudinal distance of an upper covering frame body, performing upper covering frame body construction on a finished rail station structural bottom plate, pre-installing a rail top air channel bottom template, connecting with a station hall plate, pre-embedding structural column reinforcing steel bars on an inverted arch layer of a station, installing a structural column template, pouring the rail top air channel and a structural column, installing and constructing other plate beams and templates, and simultaneously installing and constructing the side walls of.
Description
Technical Field
The invention discloses a construction method, relates to the technical field of construction in a rail transit tunnel, and particularly relates to a construction method of an assembled steel pipe support and a distributing beam combined support.
Background
With the rapid development of economic construction of various cities in China, rail transit becomes a main carrier of urban traffic and is rapidly developed, and the rail transit viaduct can adapt to various terrains and cross channels in cities. And is also increasingly occurring in rail transit construction. Because the rail transit construction is mostly in urban areas, underground pipelines, urban residents and the like are relatively concentrated, the construction land for the rail transit construction is very limited, rail transit stations and sections are mostly laid along the underground of urban main roads, the construction period is usually long in order to reduce the influence on the ground traffic, the construction objects and the like as far as possible, the urban rail transit belongs to infrastructure engineering, the requirement on the construction period is higher, more and more shield machines and TBM (tunnel boring machine) tunneling machines are put into construction, and meanwhile when a large-span underground tunnel is constructed as the rail transit station, the cross operation of the internal structure of the station and the TBM tunneling machine often affects each other.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the construction method of the assembled steel pipe support and the distribution beam combined bracket, which has the characteristics of strong universality, simple and convenient implementation and the like and has wide application prospect.
The specific scheme provided by the invention is as follows:
the construction method of the assembled steel pipe support and the distribution beam combined support comprises the following steps: pouring the steel pipe support foundations on two sides of the TBM transportation track,
determining the height of the steel pipe support according to the maximum passing height of the TBM railcar and the construction space of the rail top air duct, fixing the steel pipe support to the base of the steel pipe support,
a main beam is welded and fixed at the central line position of the top of the steel pipe strut, a distribution beam is arranged and welded above the main beam according to the longitudinal distance of the overlying frame body,
the construction of covering a frame body is carried out on the finished base plate of the railway station structure,
a rail top air duct bottom template is pre-installed and connected with the station hall plate,
pre-embedding structural column reinforcing steel bars on an inverted arch layer of a station, installing a structural column template,
pouring the rail top air duct and the structural column,
and (4) installing and constructing other plate beams and templates, and installing and constructing the side wall of the rail top air channel, and uniformly pouring concrete.
Preferably, in the construction method of the assembled steel pipe support and distribution beam combined support, steel bars are preset when the steel pipe support foundation is poured on the arc-shaped section of the inverted arch layer of the station.
Preferably, in the construction method of the assembled steel pipe pillar and distribution beam combined bracket, the bracket at each part of the upper covering bracket body is measured and positioned, and is sequentially installed according to the sequence of the longitudinal floor sweeping rod → the upright post → the transverse floor sweeping rod → the first longitudinal horizontal rod → the first transverse horizontal rod → the second longitudinal horizontal rod → the second transverse horizontal rod → the last transverse horizontal rod.
Preferably, when the assembled steel pipe support and distribution beam combined support construction method is used for constructing a station hall plate, a construction area is segmented, stress concentration areas in beams, column joints and beam spans are avoided at segmented positions, and the segmented length is divided into similar distances.
Preferably, in the construction method of the assembled steel pipe support and distribution beam combined support, the camber of the rail top air duct bottom template is determined according to the weight of the rail air duct reinforced concrete and the weight of the reinforced concrete poured into the station hall layer, settlement is reserved, the rail top air duct reinforced steel is installed after the rail top air duct bottom template is installed, and meanwhile, anchoring reinforced steel is reserved at the joint position of the side wall and the station hall plate.
Preferably, in the construction method of the assembled steel pipe support and distribution beam combined support, support pre-pressing is performed on an upper covering support body, and pre-pressing observation is performed.
Preferably, in the construction method of the assembled steel pipe support and distribution beam combined support, the pre-pressing observation points are arranged at the overhanging positions of the rail running areas in the middle and two sides of the beam and the plate according to stress analysis.
Preferably, when concrete is poured in the construction method of the assembled steel pipe support and distribution beam combined support, the maximum chloride ion content of a concrete material is 0.06%, the minimum using amount of a cementing material is not less than 320 kg/cubic meter, and the maximum limit value of the water-cement ratio is limited to 0.45.
The invention has the advantages that:
the invention provides a construction method of an assembled steel pipe support and a distribution beam combined support, which is suitable for construction in a rail transit tunnel, the assembled steel pipe support and the distribution beam support of the method have reasonable structure, reduce construction investment while ensuring construction quality and safety,
the method adopts the steel pipe support foundation as an assembly structure, can be connected by high bolts, is convenient to install and disassemble and easy to be repeatedly used,
the main beam of the method adopts the structural form of double-spliced I-shaped steel, is an assembly type member, has strong bearing capacity, is convenient for field operation,
the method of the invention can further set a height-limiting and anti-collision portal frame aiming at the condition that the TBM supporting facilities continue to use the track to pass during the construction of the internal structure, thereby playing a powerful guarantee for the construction safety,
the upper covering frame body, the steel pipe support and the distribution beam can be made of standardized components, are convenient to assemble and disassemble, have small one-time investment, are suitable for internal structures of a plurality of stations, have high reverse performance,
the steel pipe strut foundation of the method is suitable for the arc section of the low side wall of the underground horseshoe-shaped large-section underground excavation station, is not influenced by the fact that the space is small, the radian of the base surface is large and a support cannot be erected,
the method is suitable for synchronous construction of the station passing traffic and the internal structure of the underground excavation station TBM, and the construction period of the rail transit is greatly shortened.
Drawings
FIG. 1 is a schematic diagram of the layout of the steel pipe column and distribution beam combined bracket of the present invention;
FIG. 2 is a schematic view of the bottom installation of a steel pipe column;
FIG. 3 is a schematic view of a steel pipe pillar and distribution beam combination bracket;
FIG. 4 is a schematic diagram of a steel pipe strut and a steel pipe strut foundation in a TBM track;
FIG. 5 is a schematic sectional view of the installation of the concrete reinforcing bars at the bottom of the steel pipe column foundation;
FIG. 6 is a schematic plan view of the installation of concrete reinforcing bars at the bottom of the steel pipe strut foundation;
FIG. 7 is a schematic plan view of a station hall plate construction segment;
FIG. 8 is a schematic view of a structural column template;
FIG. 9 is a schematic view of structural column concrete cast joints;
FIG. 10 is a schematic illustration of a template for a beam;
FIG. 11 is a schematic view of a preload observation point setting;
FIG. 12 is a schematic flow chart of the method of the present invention.
Reference numerals:
the steel pipe support comprises a steel pipe support 1, a main cross beam 2, a distribution beam 3, a TBM (tunnel boring machine) railcar 4, a steel pipe support bottom plate 5, a steel pipe support top plate 6, a steel pipe support foundation 7, an arc-shaped inverted arch bottom steel bar 8, an inverted arch backfill surface 9, an inverted arch layer 10, a structural column formwork 11, a split bar 12, a wood back ridge 13, a double-spliced steel pipe 14, a beam concrete layer 15, a structural column concrete layer 16, a beam formwork 17 and an observation point 18.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
The invention provides a construction method of an assembled steel pipe support and a distribution beam combined support, which comprises the following steps: pouring the steel pipe support foundations 7 on two sides of the TBM transportation track,
determining the height of the steel pipe support 1 according to the maximum passing height of the TBM railcar and the construction space of the rail top air channel, fixing the steel pipe support 1 to a steel pipe support foundation 7,
a main beam 2 is welded and fixed at the central line position of the top of the steel pipe strut 1, a distribution beam 3 is arranged and welded above the main beam 2 according to the longitudinal distance of the upper covering frame body,
the construction of covering a frame body is carried out on the finished base plate of the railway station structure,
a rail top air duct bottom template is pre-installed and connected with the station hall plate,
structural column reinforcing steel bars 8 are embedded in an inverted arch layer 10 of a station, a structural column template 11 is installed,
pouring the rail top air duct and the structural column,
and (4) installing and constructing other plate beams and templates, and installing and constructing the side wall of the rail top air channel, and uniformly pouring concrete.
By utilizing the method of the invention, in the TBM track construction, the integral internal structure template bracket system adopts the combination form of the steel pipe strut 1 and the distribution beam 3, and is arranged in the safe distance range of the TBM track and two sides of the track, the dead weight of the pouring beam, the plate and the track top air channel can evenly transmit the load to the lower distribution beam 3 through the upper covering bracket body, then the distribution beam 3 evenly transmits the structure load to each steel pipe strut foundation 7 through the steel pipe strut 1 and the column top main beam 2, the steel pipe strut 1 can be manufactured by adopting the threaded steel pipe with large diameter and large wall thickness, the height of the steel pipe strut 1 is determined according to the height of TBM transportation equipment, the distance between the steel pipe struts 1 is reasonably configured according to the construction load of the station hall plate, the main beam 2 is segmented according to the distance between the steel pipe struts 1, the node of the main beam 2 is arranged at the center of the steel pipe strut 1, the, the bearing device has the characteristics of high bearing capacity, good stability, convenience in mounting and dismounting and the like.
Preferably, in some embodiments of the present invention, the steel pipe support 1 is erected on both sides of the TBM transportation rail, and considering the transportation condition of the rail trolley, the concrete of the rail row region backfill layer needs to be poured to the designed elevation, so as to increase the space of the steel pipe support erection platform. According to design requirements, the backfill layer is cast by C30 plain concrete, and after the strength of the concrete reaches 70%, the steel pipe support is installed. The requirement of TBM equipment passing space needs to be considered when the foundation is poured, and on the basis of the track width and the track trolley width, the safety distance of 300mm is respectively increased on two sides, so that the steel pipe column and the frame body are prevented from being impacted when the trolley is derailed. In addition, in the area close to one side of the midline, the traffic space of 800mm is considered.
The technical scheme includes that the problem that in two side rail traveling areas of an underground excavated subway station island type platform, the arc shape of an inverted arch side wall is large, and the distance between a TBM rail trolley and a side wall is small is mainly solved, in order to meet the steel pipe column erection requirement, an arc section foundation needs to be poured, 5 erection spaces of a steel pipe column bottom plate are increased, meanwhile, the steel pipe column bottom plate serves as an anti-collision protection measure of the TBM rail trolley, due to the fact that the weight of a steel pipe column 1 and a distribution beam 3 is large, the load during construction of a station hall layer beam, a plate and a rail top air channel is considered, phi 8 steel bars need to be drilled and installed on an inverted arch of a station to guarantee the bearing performance (no bar planting glue needs to be added), the steel bars are arranged as shown in figures 5. After the steel bars are installed, marks need to be made, and the steel pipe columns need to be arranged in marked erection areas during installation. The inverted arch backfill surface 9 is poured by C30 plain concrete, and after the strength of the concrete reaches 70%, the steel pipe support is installed, referring to fig. 4.
The height of the steel pipe support 1 needs to be selected by considering the maximum passing height of the TBM railcar, the construction space of the rail top air channel and the optimal size of the frame body. Taking a certain station as an example, the processing sizes of the steel pipe column are respectively as follows: 3000mm, 3200 mm. The steel pipe support 1 is characterized in that 500mm by 500mm steel plates need to be welded at two ends of the steel pipe support 1, the steel plates are respectively a steel pipe support bottom plate 5 and a steel pipe support top plate 6, bolt holes are formed in the steel pipe support bottom plate 5, and the steel pipe support 1 is fixed on a concrete steel pipe support foundation 7 through bolts.
The main beam 2 is made of double I-shaped 22a I-shaped steel and is longitudinally communicated, the middle of the two I-shaped steel is required to be welded, the upper surface of the I-shaped steel is ensured to form an effective plane, and the overlying distribution beam can be stably installed. During longitudinal connection, the joints of the two rows of I-shaped steel need to be staggered, stress concentration is avoided, the joints are welded, and the web is welded with the connecting steel plate, so that the connecting strength is ensured. The main beam 2 is placed on the central line of the steel pipe during installation, and the parallelism between the two rows of beams is ensured. After installation, the main beam and the steel pipe pillar top plate 6 are welded and fixed. The double-spliced I16I-steel is welded between two I-steels, and the length is 4500 mm. Evenly place in main beam top, the longitudinal distance is arranged according to covering the support body longitudinal distance, welds with main beam 2 after the installation.
Measuring and positioning the brackets at each part of the bracket of the overlying bracket body on the base plate according to the longitudinal distance and the transverse distance designed by the scheme, and marking by using red paint; and (5) straightening by using a steel tape, separating the position of the upright rod, and pointing the upright rod for marking by using a stone pen. In accordance with the line of ammunition positioning, the longitudinal floor sweeping bar → the pillar → the lateral floor sweeping bar → the first-step longitudinal horizontal bar → the first-step lateral horizontal bar → the second-step longitudinal horizontal bar → the second-step lateral horizontal bar … … are placed in order. The transverse rods and the vertical rods must be horizontal and vertical, and the vertical deviation of the vertical rods is controlled within the deviation range specified by the fact that the verticality of the whole frame is smaller than 1/500L. The rest of the requirements refer to technical safety standards of bowl-buckled steel pipe scaffolds for building construction.
The rail top air duct is a suspension structure under the station hall plate, a template needs to be installed in advance, and pouring is performed before the station hall plate.
Taking a station as an example, according to the worst structure: the rail top air duct bottom template is made of 915mm multiplied by 1830mm black paint wood plywood, and the long edge is installed along the longitudinal direction. The upper-layer ridges of the board are made of 50 multiplied by 100 square wood and are transversely arranged, and the distance between the upper-layer ridges is 300 mm; lower main ridge adopts
Double steel pipes are longitudinally arranged at a spacing of 900 mm.
Because the construction of the rail top air channel adopts the prefabrication on the scaffold in advance, the positioning and connecting quality requirements of the rail top air channel and the station hall plate are higher. The following measures are taken to ensure positioning and connection in the construction process:
(1) in order to ensure the requirement of rail top clearance, the camber of the bottom die of the rail air duct needs to consider the weight of reinforced concrete of the rail air duct and the weight of reinforced concrete of a floor slab of a pouring station hall layer, and the balance is 1.5-2 cm according to the reserved settlement.
(2) Accurate lofting is required to be carried out before the bottom formwork at the track air duct is installed, the formwork needs to be checked and reinforced after the bottom formwork is installed, and the formwork needs to be checked and reinforced after the steel bars are bound and the side formwork is closed.
And after the bottom die is finished, installing rail top air duct steel bars. Reinforcing steel bars are required to be processed at the ventilating opening of the rail top air duct; meanwhile, the side wall steel bars need to be reserved with anchoring steel bars with enough length at the joint position of the station hall plate, and effective connection of the rail top air channel structure and the station hall plate in the later period is guaranteed.
The structural column reinforcing steel bars need to be embedded in the inverted arch layer 10 of the station, in order to guarantee the passing requirement of vehicles in the second lining construction, the column reinforcing steel bars do not extend out of the inverted arch backfill surface, a pit hole needs to be reserved, the size of the pit hole is 300mm larger than that of the structural column, and therefore operation during later-stage steel bar connection is facilitated. And (4) reserving a mechanical joint for the steel bar in the pot hole and protecting the steel bar with a protective cap, wherein the joints are staggered for 35 d. And covering a steel plate on the pit, arranging a clamp, fixing the clamp above the pit, and after finishing lining construction, cleaning accumulated water and sludge in the pit and connecting upper reinforcing steel bars.
The installation of the structural column template 11 takes a certain station as an example, the cross section dimension of the structural column of the station hall is 600mm multiplied by 800mm, and the height of the upright column is 7.8 m. The structural column template 11 adopts 1.5mm wood plywood; the wood back edges 13 in the column hoops are vertically arranged by adopting 50mm multiplied by 100mm square wood; the column hoop outer edge adopts double splicing
The steel pipes 14 are horizontally arranged with a vertical spacing of 0.6m and are externally stupefied
A high-strength split-lead screw draw bar 12. The structure post utilizes full hall support horizontal steel pipe level fixed all around, prevents the slope. The structural column formwork 11 is schematically shown in fig. 8. After the structural column template 11 is installed, beam and column node positions and beam and plate templates in a non-rail-top air duct range can be laid.
The rail top air duct is preferably cast before the station hall plate, and after the casting is finished, the rail top air duct is used as a construction platform, and an upper hall plate bottom die is erected; the structural column concrete is poured before the hall plate beam and the plate structure, and plays a certain auxiliary bearing role. The joint position of the structural column concrete and the beam needs to be provided with a construction joint, the concrete pouring node refers to the figure 9, the two sides are beam concrete layers 15, and the middle is a structural column concrete layer 16.
The beam and the plate template are constructed together, the beam template 17 adopts 915mm multiplied by 1830mm black paint wood plywood, the material cutting and installation are carried out according to the specific size of the middle longitudinal beam, and the long edge of the general principle is longitudinally installed.
The side of the template where the concrete is poured is straight and has no warp, the surface of the template is coated with a release agent before each use, and slag on the surface is removed after the template is removed, so that the cleanness and the neatness of stacking are kept.
The template and the bracket are installed according to the design requirement, the length of the upper end and the lower end of the template is respectively adjusted by the movable support bracket, so that the requirement of accurate position of the template with the structural size is met, and the sizes and mutual positions of all parts of the beam, the plate and the perforated structure, the accuracy of the embedded part and the preformed hole are ensured.
After the beam template 17 is assembled, whether the template joint is straight and tight is checked, and slurry leakage cannot be caused at the joint.
The upper level ridges of the hall plate and the beam template 17 adopt 50 multiplied by 100 square wood which are transversely arranged with the distance of 300 mm; lower main ridge adopts
Double steel pipes are longitudinally arranged at a spacing of 900 mm.
The middle longitudinal beam is large in size, and the two side templates are reinforced in a special mode. The external edges of the beam side forms adopt double splicing
Steel pipe with longitudinal spacing of 0.6m and external edge
A high-strength tension rod pull rod; the horizontal steel pipe level of roof beam both sides utilization full hall support is fixed, prevents lateral displacement. The template of the beam is referenced to fig. 10.
The length of a plate of a station hall of a subsurface excavated station is about 200m-300m generally, and taking a plate of a station hall as an example, a construction area needs to be reasonably segmented, so that the one-time pouring volume of concrete is effectively reduced, and the material turnover efficiency is improved. The segmented positions avoid stress concentration areas in beam-column joints and beam spans; the segment lengths should be divided into similar distances. Referring to fig. 7, the lobby board is divided into a1-a7,7 segments. The construction sequence integrates the construction channel position of the access station hall plate of the underground excavated station, the condition of accessing resources in the construction site and the construction conditions of other parts. The construction method has the advantages that the construction method is erected according to the sequence of the door frame → the main beam → the distribution beam → the rail walking area frame → other frame bodies, construction influence among all steps is reduced, the maximum utilization rate of construction machinery is ensured, and labor cost is reduced. When the device is disassembled, whether the structural strength meets the requirement is firstly ensured, under the condition of meeting the strength, the middle frame body of the station is disassembled in advance, then the frame body in the rail running area is disassembled, the frame body system is disassembled according to the reverse order of installation, and materials are transported backwards through the rail running area passing trolley.
On the basis of the construction of the embodiment, in the construction process, the frame body and other corresponding supports are coated, and the supports are pre-pressed. The prepressing weight is applied according to 120% of the casting weight, and the prepressing time is 48 hours.
Firstly, a loading sequence: the loading is carried out in three stages, wherein the first and second times are respectively loaded by 30 percent of the total weight, and the third time is loaded by 40 percent of the total weight.
Secondly, prepressing observation: the observation position is set at L/2 and L/4 of each span, and each group is divided into three points, namely a left point, a middle point and a right point. And an observation rod is fixed at the point position so as to facilitate settlement observation. And (4) carrying out settlement observation by adopting a level gauge, and measuring the elevation of the top of the observation rod before loading after the observation rod is arranged. And the support settlement is continuously observed in the pre-pressing process, and the stability of the cross beam, the distribution beam and the steel pipe column is concerned.
And after the first loading, observing once every 2 hours, continuously observing that the sedimentation amount does not exceed 3mm twice, and carrying out second loading when the sedimentation amount is zero, and according to the steps, till the third loading is finished. After the third loading and settling are stable, unloading can be carried out.
Unloading: the sand bags are lifted and evenly unloaded by a manual crane, and observation is continued while the sand bags are unloaded. After unloading is completed, the observed values are recorded so as to calculate the deformation of the stent. And (4) finishing the pre-pressing settlement result according to the observation record, and adjusting the elevation of the support jacking to control the pre-arching height of the beam slab bottom die.
According to stress analysis, the bending moment in each joint span of each span support is the largest, and the overhanging part of the outer edge of the rail top air duct is subjected to load bias, so that the point distribution is selected at the overhanging parts of the middle and two side rail running areas of the beam and the plate. The observation point arrangement refers to fig. 11.
During observation:
the observation frequency and time can be increased as appropriate according to the actual situation, in addition to the above-mentioned regulations.
And (3) before pouring the beam slab concrete, setting observation points at the positions corresponding to the prepressing positions at the bottom of the template, and observing the support settlement in the concrete construction process. The data obtained from each observation is carefully recorded in a settlement observation special table.
5. Data sorting analysis and pre-camber setting
And processing the measured data after the observation is finished, and calculating the elastic deformation according to the total settlement value and the observation value after unloading. And analyzing according to the data measured by the test, and effectively controlling the deformation generated when the prestressed cast-in-situ box girder template bracket designed by the project is poured by concrete. The elevation of the bottom of the beam slab template can be adjusted according to the deformation, and the elevation required by design can be achieved after concrete pouring is completed.
Setting of pre-camber:
the pre-camber is determined taking into account the following factors: the total deformation of the bracket under the action of load, the elastic compression of the bracket under the action of load and the inelastic compression of the bracket under the action of load.
According to the linear change of the camber value of the beam slab, the pre-camber values of other points are distributed according to a quadratic parabola by taking the mid-span point as the highest value and the beam column node as zero.
In the above embodiment, the processing of the steel bars is strictly executed according to the design drawing and the requirements of the relevant technical specifications, a field technician makes a steel bar blanking list before processing the steel bars, and the steel bar can be blanked according to the blanking list after the audit of a technical responsible person passes. The main reinforcement must be straightened before manufacturing, the bending degree of the steel bar after straightening is not more than 1 percent of the length, and the steel bar must not be partially bent. The joints of the stressed main reinforcing steel bars are staggered, the same reinforcing steel bar cannot be provided with two joints in the joint length section, the tension area is configured on the stressed reinforcing steel bar in the joint length (35d), and the joint sectional area accounts for less than 50% of the total sectional area. The longitudinal main ribs of the main beam are arranged along the axis of the beam in a through length mode, and the longitudinal joints are mechanically connected.
The transverse steel bar joints of the station hall plate should avoid the hall plate span, and the upper and lower layer joints should be staggered by 1.3 times of lae; the upper layer steel bar joint of the beam steel is not less than 1/3 net span; the lower layer joint should avoid the beam column node encryption area and be arranged in 1/3 net span, 1.5 times the height of the beam.
The stirrup is arranged to strictly meet the design and specification requirements, and the cross point of the stirrup and the main reinforcement is firmly tied by adopting an iron wire with the diameter of 0.7-2 mm. The head of the binding wire for binding the steel bars is bent inwards towards the structure and does not enter the concrete protective layer.
The beam slab reinforcing steel bar needs to be strictly set up the concrete cushion according to the design requirement, prevents to appear leaking the muscle phenomenon.
And the concrete material requirement
1) The concrete that inner structure bulky was pour avoids adopting high hydrothermal cement, and the concrete preferentially adopts two technologies of mixing, and the high performance compensation inflation concrete should be adopted in the structure post-cast strip, and intensity is greater than a reference numeral of structure.
2) The minimum dosage of the cementing material is strictly controlled to be not less than 320 kg/cubic meter.
3) The maximum chloride ion content of the concrete is 0.06 percent.
4) It is preferable to use a non-alkali reactive aggregate, and when an alkali reactive aggregate is used, the maximum alkali content in the concrete is 3.0kg/m3 and does not exceed 0.6% by weight of the cement.
5) The maximum limit of the water-glue ratio is limited to 0.45.
The concrete pouring principle is as follows:
1) before pouring, sundries in the template and oil stains on the steel bars are removed completely, the template is wetted but no accumulated water is left, whether a steel bar protective layer cushion block of the steel bars is well filled is checked, and a cleaning opening of the column template is tightly closed after the sundries and the accumulated water are removed.
2) The free pouring height of the concrete is not more than 2m, and when the free pouring height of the concrete exceeds 2m, in order to prevent segregation, the concrete is poured through a sliding chute, a string cylinder and other devices or through a reserved opening on a template; the concrete pouring is carried out continuously, when the concrete pouring is required to be intermittent, the intermittent time is preferably shortened, and the secondary concrete is poured before the primary setting of the front concrete; the concrete transportation, pouring and intermittence time are not more than the specification in the following table, and when the concrete transportation, pouring and intermittence time exceed the specification, the concrete is treated according to construction joints.
3) When the concrete is poured, a specially-assigned person is assigned to frequently observe whether the template steel bars, the reserved holes, the embedded parts and the like have displacement deformation or blockage, the problem is immediately treated, and the pre-treatment of the poured concrete is completed. Table 1 illustrates concrete delivery, placement and interval allowance times (min).
TABLE 1
Concrete curing:
concrete curing was carried out immediately after demolding. The maintenance adopts a high-pressure water mist maintenance mode, and a specially-assigned person is assigned to ensure that the structure is kept moist within 14 d. The temperature in the tunnel is relatively even, the temperature difference is small, the relative humidity is large, the maintenance is generally carried out once a day, and the maintenance principle is to ensure that the surface of the concrete is wet and prevent the surface from whitening. The construction operation needs to be adjusted in real time according to specific conditions.
The covering watering maintenance conforms to the following regulations:
1) covering, watering and curing are carried out within 12 hours after the concrete pouring is finished;
2) watering and curing the concrete for not less than 14 days;
3) the pouring times are determined according to the condition that the concrete can be kept in a wet state;
4) the water for curing the concrete should meet the relevant regulations.
Formwork and support system removal
And after the concrete pouring is finished and the strength reaches a certain requirement, the side die, the inner template, the side die plate and the inner template support frame are disassembled. The demolishing adopts manual demolishing, and truck crane, fork truck cooperate handling template and support frame steel pipe.
Removing the mould attention:
1) when the concrete reaches the required strength, the concrete must be checked and verified by project quality inspection personnel, and after the scaffold is confirmed to be no longer needed, the concrete is approved by a supervision unit, and a project safety chief administrator issues a formal notice to remove the concrete. The concrete strength of the bearing structure meets the following requirements:
2) when the non-bearing template (wall, column and beam side mould) is removed, the strength of the structural concrete is not lower than 1.2Mpa, so as to ensure that the surface and edges of the concrete are not damaged.
3) A safety warning area and a warning board are required to be arranged on the site of scaffold dismantling, a specially-assigned person is dispatched to take care of the scaffold dismantling, and non-construction operators are strictly prohibited from entering the dismantling operation area.
And the support below the rail top air channel is reserved after the rail top air channel is poured, and is detached together with other support bodies in the middle part when the station hall beam and the plate are poured and the strength meets the requirement.
And after the rail top air duct bracket is dismantled, dismantling a gantry system above the TBM rail according to the sequence of the distribution beam → the main beam → the steel pipe column, and constructing by using a TBM supporting facility passage window period during dismantling.
The support dismantling requirement is as follows:
the dismantling operation needs to be dismantled layer by layer from top to bottom, and simultaneous operation from top to bottom is strictly forbidden;
in the process of dismantling, all rods and accessories which are loosened and connected are dismantled in time and transported away, so that the phenomenon of mistaken supporting and leaning is avoided;
the removed rod should be lifted or transported away in a safe manner, strictly prohibited from being thrown downwards. Table 2 concrete strength required for form removal of cast-in-place structures.
TABLE 2
During the concrete construction of the invention, the used main structure materials and auxiliary materials all need to meet the requirements of technical specifications. Before entering the field, materials and equipment for permanent structures need related material quality guarantee certificates. Reinforcing steel bars, steel plates, welding rods, straight thread sleeves and the like used in construction need to be comprehensively rechecked according to the standard requirements after entering a field. Table 3 is a summary of the main materials. Table 4 is a table for the implement equipment.
TABLE 3
TABLE 4
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. The construction method of the assembled steel pipe support post and the distribution beam combined bracket is characterized in that the foundation pouring of the steel pipe support posts at two sides of the TBM transportation track is carried out,
determining the height of the steel pipe support according to the maximum passing height of the TBM railcar and the construction space of the rail top air duct, fixing the steel pipe support to the base of the steel pipe support,
a main beam is welded and fixed at the central line position of the top of the steel pipe strut, a distribution beam is arranged and welded above the main beam according to the longitudinal distance of the overlying frame body,
the construction of covering a frame body is carried out on the finished base plate of the railway station structure,
a rail top air duct bottom template is pre-installed and connected with the station hall plate,
pre-embedding structural column reinforcing steel bars on an inverted arch layer of a station, installing a structural column template,
pouring the rail top air duct and the structural column,
and (4) installing and constructing other plate beams and templates, and installing and constructing the side wall of the rail top air channel, and uniformly pouring concrete.
2. The construction method of the assembled steel pipe support post + distribution beam combined bracket as claimed in claim 1, wherein the steel bars are preset when the steel pipe support post foundation is poured on the arc-shaped section of the inverted arch layer of the station.
3. The construction method of the assembled steel pipe column + distribution beam combined bracket as claimed in claim 1 or 2, wherein the bracket at each part of the upper covering frame body is measured and positioned, and is sequentially installed in the order of the longitudinal floor sweeping rod → the pillar → the transverse floor sweeping rod → the first longitudinal horizontal rod → the first transverse horizontal rod → the second longitudinal horizontal rod → the second transverse horizontal rod to the last transverse horizontal rod.
4. The construction method of the assembled steel pipe support post + distribution beam combined bracket as claimed in claim 3, wherein when the station hall plate is constructed, the construction area is segmented, the segmented position avoids the stress concentration area in the beam, the column node and the beam span, and the segmented length is divided into similar distances.
5. The construction method of the assembled steel pipe pillar and distribution beam combined bracket as claimed in claim 4, wherein the camber of the bottom template of the rail top air duct is determined according to the weight of reinforced concrete of the rail air duct and the weight of reinforced concrete for pouring the station hall layer, settlement is reserved, the reinforced steel bars of the rail top air duct are installed after the bottom template of the rail top air duct is installed, and anchoring steel bars are reserved at the joint positions of the side walls and the station hall plates.
6. The construction method of the assembled steel pipe support and distribution beam combined bracket as claimed in claim 1 or 5, wherein the bracket is pre-pressed on the upper covering bracket body, and pre-pressing observation is performed.
7. The construction method of the assembled steel pipe support post + distribution beam combined bracket as claimed in claim 6, wherein the pre-pressing observation points are arranged at the overhanging positions of the middle and two side rail-mounted areas of the beam and the plate according to the stress analysis.
8. The construction method of the assembled steel pipe support post + distribution beam combined bracket as claimed in claim 1 or 7, wherein when the concrete is poured, the maximum chloride ion content of the concrete material is 0.06%, the minimum dosage of the cementing material is not less than 320 kg/cubic meter, and the maximum limit value of the water-cement ratio is limited to 0.45.
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| CN114458042A (en) * | 2022-02-22 | 2022-05-10 | 中建八局轨道交通建设有限公司 | Construction method for newly building plate above existing subway station rail-mounted area |
| CN114875954A (en) * | 2022-04-02 | 2022-08-09 | 中建隧道建设有限公司 | Station hall layer support construction method for parallel construction of underground excavated station track laying and station hall layer |
| CN115075291A (en) * | 2021-03-15 | 2022-09-20 | 朴真甘 | Underground warehouse modular structure using prefabricated segment vertical hole and construction method |
| CN115125996A (en) * | 2022-06-30 | 2022-09-30 | 陕西帕源路桥建设有限公司 | Underground house construction technology based on assembled combined die |
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Application publication date: 20210115 |