CN114892707B - Construction method of impervious anti-crack concrete foundation of vibration table for whole test of high-speed magnetic levitation train - Google Patents
Construction method of impervious anti-crack concrete foundation of vibration table for whole test of high-speed magnetic levitation train Download PDFInfo
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Abstract
The invention belongs to the technical field of civil engineering, in particular to a construction method of an anti-seepage and anti-crack concrete foundation of a vibration table for a whole high-speed magnetic levitation train test, which aims to solve the problem that in the prior art, high-speed magnetic levitation whole running system vibration test table equipment needs to be located in a large-volume concrete foundation structure with high anti-seepage and high anti-crack level, and the conventional construction method cannot be completed. According to the method, the profile steel bar support is erected, the horizontal vertical vibration-resistant anti-cracking reinforcing steel bar net and the bidirectional prestress anti-cracking reinforcing steel bar net are installed based on the profile steel bar support, the embedded part is installed while reinforcing steel bars are bound to form a casting reinforcing steel bar complex, meanwhile, the mixing proportion of casting concrete is determined through a trial-mix concrete raw material assembly test, casting is carried out in layers and in a layered mode, temperature tests are carried out after casting to guide concrete maintenance, and the method is used for improving vibration-resistant anti-cracking and anti-seepage capabilities of a concrete body; and (5) completing the construction of the concrete foundation.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a construction method of an anti-seepage and anti-crack concrete foundation of a vibration table for a whole test of a high-speed magnetic levitation train.
Background
The levitation frame, the electromagnet and the levitation control system of the magnetic levitation vehicle jointly form a travelling system of the magnetic levitation vehicle. The running mechanism is one of important parts of a vehicle subsystem of the magnetic levitation transportation system, has the functions of bearing, mechanical decoupling, vibration reduction and the like, at present, the high-speed magnetic levitation commercial operation line at home and abroad also only has a Shanghai high-speed magnetic levitation demonstration line, the total length of the demonstration line is 29.6km, the highest operation speed is 430km/h, and the running mechanism is insufficient for supporting the national ' research and development project- ' test research of a new generation of high-speed magnetic levitation system at the highest speed of 600km/h ', and no set of test platform of the high-speed magnetic levitation system at home and abroad can meet the speed of 600km at home and abroad.
The complex high-speed magnetic levitation whole vehicle running system vibration test bed equipment needs to be located on a large-volume reinforced concrete structure which accords with the high anti-permeability and high anti-crack level, how to ensure to build a reinforced concrete structure foundation which accords with the high-speed magnetic levitation system test verification platform with the high anti-permeability and high anti-crack level, and the high-quality implementation of the large-volume anti-crack anti-permeability concrete foundation of the test bed is very important for high-quality and smooth completion of the whole vehicle running test of the high-speed magnetic levitation train.
Disclosure of Invention
To the problems and the shortcomings existing in the prior art, the application provides a construction method of an anti-seepage and anti-cracking concrete foundation of a vibration table for a whole high-speed magnetic levitation train test, which is characterized in that a reinforcing steel bar bracket is erected and is used as an installation standard to install a reinforcing steel bar net and a bidirectional prestress anti-cracking reinforcing steel bar net, so that a reinforcing steel bar complex is formed. Meanwhile, the mixing proportion of concrete for pouring implementation is determined through a trial-mix concrete raw material assembly test, concrete pouring is carried out in layers and in layers, and a temperature test is carried out after pouring so as to guide concrete maintenance, so that the vibration resistance, crack resistance and impermeability of a concrete body are improved, and the test requirement of a vibration table for the whole vehicle running test of a high-speed magnetic levitation train is met.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the method for constructing the impervious anti-crack concrete foundation of the vibration table of the whole test of the high-speed magnetic levitation train comprises a whole test train and a levitation platform, wherein the whole test train is arranged on the levitation platform; the concrete foundation comprises a concrete body, a vibrating table and a vibrator; the concrete body is provided with a groove structure, the vibrating table is arranged in the groove, and the upper end of the vibrating table is fixedly connected with the bottom side of the suspension platform; the bottom and the wall of the concrete body groove are respectively provided with a vibrator, and one end of the vibrator is respectively connected with the bottom end and the side surface of the vibrating table; according to the vibrator installation position of the concrete body, the construction method of the concrete foundation is to construct the concrete body Shi Gongfen in a multi-layer distribution mode, and the method comprises the following steps:
s1, excavating and supporting a foundation pit; ensuring the safety of soil around the foundation pit, cleaning the bottom of the foundation pit, measuring and paying off, paving a broken stone water filter layer before pouring a cushion layer, and then pouring the cushion layer and constructing a bottom waterproof layer; the foundation pit geological condition of the concrete foundation of the vibrating table generally stores original soil pore water or band-shaped crack water, the condition limited to the foundation pit cannot effectively reduce water, only open drainage precipitation can be adopted, and in order to ensure smooth construction of the concrete foundation, water seepage damage is not caused to the concrete foundation in the process, and a broken stone water filtering layer is added at the bottom of the cushion layer. The device has the functions of diffusing stress and draining water on soft foundations and accelerating consolidation and settlement of soil layers at the lower part.
S2, layering and gradually erecting a full-hall reinforcing steel bar support at the bottom of the foundation pit of the S1; after each layer of reinforcing steel bar support is erected, binding horizontal anti-cracking reinforcing steel bar nets at intervals along the radial direction by taking the reinforcing steel bar support as an erection standard to form a horizontal vertical three-dimensional reinforcing steel bar net; in the process of binding the reinforcing steel bars, a cooling water pipe is pre-buried and installed; the reinforced bar bracket is matched with the reinforced bar net to form a reinforced bar complex cast by the concrete body, so that the overall stability of the concrete foundation can be improved, and particularly the reinforced bar complex cast by the reinforced bar bracket is used for testing the high vibration property of the vibration table, and the vibration resistance and crack resistance of the concrete foundation can be effectively improved. During the construction of the steel bar net, firstly, the full-hall steel bar support is erected for construction, then the steel bar support is used as a reference, the construction and installation of the steel bar net are completed, the installation precision is improved, and the construction flow is rapid. Because the construction object of this application is the bulky concrete foundation, concrete foundation thickness is big, the reinforcing bar net plane area that needs the installation is big, conventional reinforcing bar support adopts the diameter to weld into the A font support or make the split heads form for 22 mm's or 25 mm's reinforcing bar former material generally, then weld the upper strata owner muscle of raft on the support, consider upper and lower floor's reinforcing bar net interval great, need constructor to set up the platform operation, lead to the construction progress slow, compare conventional reinforcing bar support, this application adopts shaped steel reinforcing bar support bearing capacity big, reinforcing bar net or support collapse phenomenon can not take place, construction security and stability are high. The reinforcing steel bar support is built successively in the layering of this application, accomplishes every layer of reinforcing steel bar support and builds the back, uses reinforcing steel bar support as the benchmark again, along radial ligature installation reinforcing steel bar net, and the construction is fast. After the construction of the lower layer steel bar support and the steel bar net is completed, the lower layer steel bar support is taken as a reference to upwards erect the upper layer steel bar support and the installation steel bar net, and the operability is high.
S3, after the construction of the steel bar support and the steel bar net in the S2 is completed, vertical prestress anti-cracking steel bar installation is carried out; when in installation, the steel bar bracket is taken as a building standard, the vertical anti-cracking steel bars are bound along the horizontal direction to form a horizontal and vertical bidirectional anti-cracking steel bar net, and the embedding work of the temperature measuring element is synchronously carried out to form a concrete body pouring steel bar complex; the vertical prestressed anti-cracking reinforcing steel bars are arranged to form a horizontal and vertical bidirectional anti-cracking reinforcing steel bar net, the prestressed anti-cracking reinforcing steel bar net is arranged in the concrete body area provided with the test equipment, the anti-cracking and anti-vibration performance of the concrete body in the area can be improved, and the vertical prestressed anti-cracking reinforcing steel bars can be reduced or canceled according to design requirements for the concrete body without the test equipment arranged on the lower layer so as to control the construction cost of the whole concrete foundation construction.
S4, gradually installing templates in layers and pouring concrete; in the pouring process, the reinforced bar complex in the S3 is divided into a basic section and an upper section along the radial direction by using the position of concrete body installation test equipment; firstly, installing a template of a foundation section, pouring concrete, and maintaining; after the foundation section is constructed, installing a template of the upper section, pouring concrete and maintaining; when the upper section is constructed, the embedded part is firstly installed and used for installing test equipment after concrete pouring is completed; and finishing the construction of all concrete bodies. The concrete foundation is large in volume and large in concrete consumption, concrete pouring and layering are carried out on the whole concrete foundation in order to improve the molding quality of poured concrete, pouring and maintenance of the concrete can be effectively carried out gradually in layers, the construction quality is improved, compared with the whole pouring of large-volume concrete, the concrete is poured gradually in layers, the construction difficulty is low, the maintenance effect is good, and particularly when temperature test is carried out to guide concrete maintenance, the concrete pouring and maintenance are carried out gradually in layers, the construction period is short, the temperature test difficulty is low, and the temperature monitoring is easy.
S5, after the construction of all concrete bodies is completed, tissue quality inspection and acceptance are carried out, test equipment including a vibrating table and a vibrator is installed, secondary grouting is carried out on the test equipment and the embedded part, and final installation accuracy is adjusted; and finishing the construction of all concrete foundations.
Specifically, when a full-hall steel bar bracket is erected in S2, the concrete body is divided into an upper layer, a middle layer and a lower layer according to the installation position of the concrete body test equipment; the upper layer is a concrete body area from the bottom of the groove to the top of the groove; the middle layer is a concrete body area which downwards covers the embedded part of the groove bottom test equipment along the groove bottom; the lower layer is a residual concrete body area. The concrete body is divided into three layers by the arrangement, the equipment installation positions are used for layering, different construction standards are formulated for different concrete body layers, and quality control and construction cost control are convenient to carry out.
Specifically, when a full-hall steel bar bracket is erected in S2, the steel bar bracket is made of section steel, and the section steel comprises a stand column, a large cross bar and a small cross bar; binding a layer of foundation reinforcement at the bottom of a foundation pit before the lower concrete body reinforcement bracket is installed, and binding reinforcement after the installation of the lower concrete body reinforcement bracket is completed to form a construction of a horizontal and vertical three-dimensional reinforcement net of the lower concrete body; and then sequentially completing binding the reinforcing steel bar brackets and the reinforcing steel bars of the middle-layer concrete body and the upper-layer concrete body, and binding the reinforcing steel bars of the upper-layer concrete body and the equipment by adopting shear pier reinforcing steel bars when the upper-layer concrete body is bound.
Specifically, when the vertical prestressed anti-cracking steel bars are bound in S3, the prestressed anti-cracking steel bars are selected from slow-binding prestressed anti-cracking steel bars; in the binding, when the distance between the reinforcing steel bar brackets is large, the fixing cross bars are installed at intervals between the reinforcing steel bar brackets to be used as auxiliary fixing pieces of vertical prestress anti-cracking reinforcing steel bars to be bound with the reinforcing steel bar brackets. The fixing cross rod is arranged as an auxiliary fixing piece, so that binding of vertical anti-cracking steel bars among large-span steel bar supports can be met, and the installation stability of the vertical prestressed anti-cracking steel bars is improved.
Specifically, when S4 performs concrete pouring, the foundation section is the lower concrete body; firstly, installing a template of a lower concrete body, and pouring concrete; when the upper section is constructed, concrete pouring is carried out on the steel bar complex according to layered distribution of the middle layer and the upper layer; when the embedded part is installed, positioning is carried out by using a surveying instrument, and the embedded part is fixed and tightly propped by using a fixing part, so that the embedded part and the steel bar support are connected into a whole; and a metal bottom plate is arranged at the outer leakage part of the embedded part, and the metal bottom plate is fixedly connected with the embedded part by penetrating through the embedded part through a high-strength screw. And the metal bottom plate is arranged and penetrates through the embedded part through the high-strength screw rod to install the metal bottom plate, so that the installation stability of the test equipment is improved.
Specifically, when curing is performed after the concrete pouring is performed in the step S4, a temperature test is performed to guide the concrete curing, the surface temperature difference in the concrete pouring body is not more than 20 ℃, and the cooling rate of the concrete pouring body is not more than 2.0 ℃/d; the use temperature of the cement for discharging is below 60 ℃. And (3) performing a temperature test to guide maintenance after concrete pouring, and improving the crack resistance of the concrete foundation concrete structure.
Specifically, when the embedded part is installed in the S4, the phi 6@100×100 anti-cracking reinforcing steel mesh is additionally arranged on the installation surface of the embedded part. Because the vibrating table needs to be embedded with embedded parts with high precision and large size, the thickness of the reinforcing steel bar protection layer on the embedded part installation surface is large, and the anti-cracking reinforcing steel bar net sheet is additionally arranged, so that the anti-cracking and anti-vibration performance of the concrete foundation surface is improved.
Specifically, before S4 concrete pouring is carried out, a trial-mix concrete raw material assembly test is carried out according to the design requirement of a concrete body; the determining of the optimal raw material composition comprises: and (3) cement: ordinary Portland cement, PO42.5 grade; coarse aggregate: the stone is basalt, and the continuous grading is 5.0 mm-25.0 mm; fine aggregate: the specification of the water-washed quartz river sand is middle sand, the fineness modulus is 2.7, and the mud content is 2%; water reducing agent: the polycarboxylic acid water reducer is adopted as special additive for mass concrete, and the adding ratio is 2.5-3.0%; fly ash: the specification is grade II, and the quality meets the current national standard; mineral powder: the specification is S95 grade, and the quality meets the current international standard; water: low temperature water 10 ℃. The method takes the integral anti-cracking and anti-vibration performance of the concrete foundation as the target guide, performs the trial-and-test of the concrete raw materials, is used for determining the optimal mix ratio of the poured concrete, and can effectively save the construction cost while improving the anti-cracking performance of the concrete foundation.
Specifically, through repeated trial and error experiments, the mixing ratio of concrete body for casting concrete is determined as follows: cement 21kg/m3; 101kg/m3 of fly ash; 162kg/m3 of tap clean water; coarse aggregate 9.5-25 mm 717kg/m3, 4.75-9.5 mm 300kg/m3; river sand 756kg/m3; 9kg/m3 of water reducer; the crack resistance fiber is 1kg/m3. And the early expansion effect and the later contraction factor of the concrete foundation casting concrete are considered, a micro-expansion agent is added in the conventional concrete composition, and a proper amount of anti-cracking fibers are added to enhance the anti-cracking performance of the large-volume concrete of the vibrating table.
Specifically, in the mass inspection in S5, PS42.5 slag cement is adopted, the concrete strength adopts 60d strength as an inspection index, and the mass inspection is performed by adopting a method of reducing the consumption of cement and mineral powder.
Compared with the prior art, the beneficial effect of this application lies in:
1. the method has the advantages of operability, multiple technical innovations and optimization, and multiple measures for improving vibration resistance, cracking resistance and impermeability of the concrete foundation are arranged for combined construction, so that the test effect of the test vibration table is improved.
2. The special performance effect which needs to be achieved by the concrete structure of the walking vibration test bed of the similar high-speed magnetic levitation whole vehicle can be ensured; the comprehensive benefit of engineering can be greatly improved.
3. The steel bar support is erected fully through the arrangement, so that the installation accuracy of the steel bar net, the slow-bonding prestressed tendons and the embedded parts can be ensured, the concrete foundation thickness limitation is avoided, the construction is performed in a layered distribution mode, and the working efficiency is high.
4. According to the concrete composition formula trial-mix test method, the concrete composition formula trial-mix test is carried out, the concrete composition formula trial-mix test method determines that the concrete composition formula trial-mix test method meets the construction easiness and has the effect of improving crack resistance, the overall crack resistance and vibration resistance of the concrete foundation are improved, and meanwhile the construction cost is effectively saved.
Drawings
FIG. 1 is a schematic diagram (1) of the outline dimensions of a concrete foundation of a vibrating table of a high-speed maglev train according to the embodiment;
FIG. 2 is a schematic diagram (2) of the outline dimensions of the concrete foundation of the vibrating table of the high-speed maglev train according to the embodiment;
fig. 3 is a top view of a concrete foundation reinforcement bracket structure of a vibrating table of the high-speed maglev train in the embodiment;
FIG. 4 is a cross-sectional view A-A of FIG. 3 in this embodiment;
FIG. 5 is a cross-sectional view B-B of FIG. 3 in this embodiment;
FIG. 6 is a schematic diagram of the intake of cooling water for the concrete foundation of the vibrating table of the high-speed maglev train in this embodiment;
FIG. 7 is a schematic diagram showing the arrangement of cooling water pipes between a middle concrete body and an upper concrete body in a concrete foundation of a vibrating table of a high-speed maglev train in this embodiment;
FIG. 8 is a schematic diagram showing the arrangement of cooling water pipe spacing of a concrete foundation lower concrete body of a vibrating table of a high-speed maglev train in the embodiment;
fig. 9 is a schematic diagram of the arrangement of vertical slow-bonding prestressed tendons of a concrete foundation of a vibrating table of a high-speed maglev train in the embodiment;
fig. 10 is a schematic diagram of the installation of the concrete foundation embedded part of the vibrating table of the high-speed maglev train in the embodiment.
Wherein: 1. a steel plate; 2. a small cross bar; 3. a shear support; 4. a reinforced concrete structure; 5. a high-strength screw; 6. an embedded part; 7. a bottom plate of the embedded part; 8. a lower limit nut; 9. an iron bottom plate; 10. a gasket; 11. an upper fixing nut; 12. a water inlet; 13. a water outlet; 31. a column; 32. a large cross bar.
Detailed Description
The present invention will be specifically described with reference to examples below in order to make the objects and advantages of the present invention more apparent. It should be understood that the following text is intended to describe only one or more specific embodiments of the invention and does not limit the scope of the invention strictly as claimed.
The embodiment is a vibration test stand of a Qingdao high-speed magnetic levitation whole vehicle running system, is an examination test index of a key technical research subject of a high-speed magnetic levitation transportation system of a key development plan of advanced rail transportation in China of the science and technology department, implements practical research from theoretical research to product conversion aiming at a magnetic levitation technology, makes up for the blank of a high-speed magnetic levitation system test verification platform, fills the blank of full-speed ground verification of a current domestic and foreign magnetic levitation vehicle system, and is a domestic and international initiative. Considering that the standard length of a carriage where the head of the magnetic levitation train is positioned is about 28m, the width is about 4m, and the lower part of the test train is arranged on the levitation platform. The concrete base size of the vibration test bed of this embodiment is l×b×h:49 x 20 x 10m, the middle part has seted up the recess of inwards sunk, is regarded as the installation space of test bench and magnetism suspension car. The depth of the recess is preferably such that the walls of the recess can be placed and the side vibrator mounted.
1-10, the embodiment provides a construction method of an anti-seepage and anti-cracking concrete foundation of a vibration table for a whole test of a high-speed magnetic levitation train, wherein the magnetic levitation train comprises a whole test train and a levitation platform, and the whole test train is arranged on the levitation platform; the concrete foundation comprises a concrete body, a vibrating table and a vibrator; the size of the concrete foundation structure is matched with that of the maglev train; the concrete body is provided with a groove structure, the vibrating table is arranged in the groove, and the upper end of the vibrating table is fixedly connected with the bottom side of the suspension platform; the bottom and the wall of the concrete body groove are respectively provided with a vibrator, and one end of the vibrator is respectively connected with the bottom end and the side surface of the vibrating table; according to the vibrator installation position of the concrete body, the construction method of the concrete foundation is to construct the concrete body Shi Gongfen in a multi-layer distribution mode, and the method comprises the following steps:
s1, excavating and supporting a foundation pit; ensuring the safety of soil around the foundation pit, cleaning the bottom of the foundation pit, measuring and paying off, paving a broken stone water filter layer before pouring a cushion layer, and then pouring the cushion layer and constructing a bottom waterproof layer;
s2, layering and gradually erecting a full-hall reinforcing steel bar support at the bottom of the foundation pit of the S1; after each layer of steel bar support is erected, binding horizontal anti-cracking steel bars at intervals along the radial direction by taking the steel bar support as an erection standard to form a horizontal and vertical three-dimensional anti-cracking steel bar net; in the process of binding the steel bars, a cooling water pipe is installed in a pre-buried mode. When the full-hall steel bar bracket is erected, the concrete body is divided into an upper layer, a middle layer and a lower layer according to the installation position of the concrete body test equipment; the upper layer is a concrete body area from the bottom of the groove to the top of the groove, and the radial thickness is 4.5m; the middle layer is a concrete body area which downwards covers the embedded part 6 of the groove bottom test equipment along the groove bottom, and the radial thickness is 2.5m; the lower layer is a residual concrete body area, and the radial thickness is 3.5m. The steel bar bracket is made of steel, the steel comprises an upright post 31, a large cross rod 32 and a small cross rod 2, the upright post 31 is made of 10# channel steel, the large cross rod 32 is made of 10# channel steel, and the small cross rod 2 is made of angle steel L75 with the thickness of 6 mm. Before the lower concrete body steel bar bracket is installed, a layer of foundation steel bars is bound at the bottom of a foundation pit, then the lower concrete body steel bar bracket is installed, firstly, the lifting installation work of the upright posts 31 is carried out, and then the cross bars are installed, so that the grid-shaped three-dimensional steel bar bracket is formed. The bottom end of the upright post 31 is connected with the steel plate 1, which plays a role of a steel backing plate and prevents underground water from leaking into the concrete foundation along the upright post. And after the completion, the lower layer reinforcing steel bar meshes are hung at intervals along the upright posts 31 and are bound and installed, so that the construction of the horizontal and vertical three-dimensional reinforcing steel bar meshes of the lower layer concrete body is formed. And shear supports 3 are adopted at two sides of the reinforcement bracket of the lower concrete body and the bottom of the foundation pit to form a natural slope of the bottom of the pit, and a construction space is reserved for the drainage of the bottom of the later stage. In the embodiment, the whole concrete foundation is in a cuboid structure, the whole reinforcing steel bar support is in a regular structure, and the whole hoisting installation of the reinforcing steel bar net is convenient to directly carry out from the upper side, so that the reinforcing steel bar net adopted in the embodiment is subjected to binding molding in advance and then is hoisted integrally, and in actual construction, the reinforcing steel bars can be assembled and bound by taking the reinforcing steel bar support as a reference in a mode of binding horizontal reinforcing steel bars along the radial direction as required. After binding the reinforcing steel bars of the lower concrete body, sequentially binding the reinforcing steel bar brackets of the middle concrete body and the upper concrete body, and binding the reinforcing steel bars of the upper concrete body by adopting shear pier reinforcing steel bars when the reinforcing steel bars of the upper concrete body are bound and equipment is installed. When the upper layer steel bar support is erected, the upright post of the upper layer steel bar support is installed by adopting a mode that the top end of the upright post of the lower layer steel bar support is directly welded or fixedly connected with the upright post, and then the cross rod is installed after the completion, so that the assembly construction of the upper layer steel bar support is formed. When the middle layer concrete body is bound and installed by the reinforcing mesh, the reinforcing mesh is bound and fixed according to the arrangement of the interval @500 mm.
S3, after the construction of the steel bar support and the steel bar net in the S2 is completed, vertical prestress anti-cracking steel bar installation is carried out; when the concrete body pouring reinforcement complex is installed, the reinforcement bracket is taken as a building standard, vertical slow bonding prestressed anti-cracking reinforcement is bound along the horizontal direction, a horizontal and vertical bidirectional anti-cracking reinforcement net is formed, the embedding work of the temperature measuring element is synchronously carried out, and the concrete body pouring reinforcement complex is formed. When the vertical prestressed anti-cracking steel bars are bound, the slow-bonding prestressed anti-cracking steel bars are selected for the vertical prestressed anti-cracking steel bars, and when the distance between the steel bar brackets is large, the fixing cross bars are installed at intervals between the steel bar brackets to be used as auxiliary fixing pieces of the vertical anti-cracking steel bars for binding the steel bar brackets.
S4, gradually installing templates in layers and pouring concrete; in the pouring process, the reinforced bar complex in the S3 is divided into a basic section and an upper section along the radial direction by using the position of the embedded part 6 of the concrete body installation test equipment; firstly, installing a template of a foundation section, pouring concrete, and maintaining; after the foundation section is constructed, installing a template of the upper section, pouring concrete and maintaining; when the upper section is constructed, the embedded part 6 is firstly installed and used for installing test equipment after concrete pouring is completed; and finishing the construction of all concrete bodies.
Further, when the concrete pouring is performed in the step S4, the foundation section is the lower concrete body; firstly, installing a template of a lower concrete body, and pouring concrete; when the upper section is constructed, concrete pouring is carried out on the steel bar complex according to layered distribution of the middle layer and the upper layer; during middle-layer section construction, firstly, the embedded part 6 is fixedly installed, the precise positioning is performed by a surveying and mapping instrument, the precise positioning is performed by welding and jacking with a steel bar, the precise positioning and jacking with the steel bar are connected with a steel bar bracket into a whole, then, the vibrating table iron floor is installed, the vertical connection and the fixation of the vibrating table iron floor and the embedded part 6 are firm by using a high-strength screw rod, afterwards, the peripheral template configuration installation is performed, and finally, concrete is poured and maintenance is performed. And constructing an upper layer section, and constructing according to a middle layer section mode. The two ends of the embedded part 6 are connected with an equipment installation iron bottom plate 9 and an embedded part bottom plate 7 in the reinforced concrete structure 4 in a penetrating way through a high-strength screw 5, one end of the embedded part is connected with the embedded part bottom plate 7 in a limiting way through a lower limiting nut 8, and the other end of the embedded part is fixed through an installation gasket and an upper fixing nut 11.
S5, after the construction of all concrete bodies is completed, tissue quality inspection and acceptance are carried out, test equipment including a vibrating table and a vibrator is installed, secondary grouting is carried out on the test equipment and the embedded part 6, and final installation accuracy is adjusted; and finishing the construction of all concrete foundations.
Further, when curing is performed after the concrete pouring is performed in the step S4, performing a temperature test to guide the concrete curing, wherein the surface temperature difference in the concrete pouring body is not more than 20 ℃, and the cooling rate of the concrete pouring body is not more than 2.0 ℃/d; the use temperature of the cement for discharging is below 60 ℃. When the temperature test is carried out, the temperature control is carried out through the cooling water system of the concrete foundation, and the water inlet 12 and the water outlet 13 form circulating water supply, so that the temperature inside and outside the concrete foundation pouring body can be regulated.
Further, when the embedded part 6 is installed in the S4, the phi 6@100×100 anti-cracking reinforcing steel mesh is additionally arranged on the installation surface of the embedded part 6.
Further, before the concrete pouring is carried out in the step S4, a trial-mix concrete raw material assembly test is carried out according to the design requirement of the concrete body; the determining of the raw material composition comprises: and (3) cement: ordinary Portland cement, PO42.5 grade; coarse aggregate: the stone is basalt, and the continuous grading is 5.0 mm-25.0 mm; fine aggregate: the specification of the water-washed quartz river sand is middle sand, the fineness modulus is 2.7, and the mud content is 2%; water reducing agent: the polycarboxylic acid water reducer is adopted as special additive for mass concrete, and the adding ratio is 2.5-3.0%; fly ash: the specification is grade II, and the quality meets the current national standard; mineral powder: the specification is S95 grade, and the quality meets the current international standard; water: low temperature water 10 ℃.
Further, through repeated trial and error experiments, the mixing ratio of concrete body for casting concrete is determined as follows: cement 21kg/m3; 101kg/m3 of fly ash; 162kg/m3 of tap clean water; coarse aggregate 9.5-25 mm 717kg/m3, 4.75-9.5 mm 300kg/m3; river sand 756kg/m3; 9kg/m3 of water reducer; the crack resistance fiber is 1kg/m3.
Working principle: according to the anti-seepage and anti-cracking concrete foundation construction method for the vibration table of the whole vehicle test of the high-speed magnetic levitation train, which is provided by the embodiment, the anti-seepage, anti-cracking and anti-vibration concrete technical requirements are formulated for meeting the complex technical requirements of the high-vibration performance of the vibration table and the on-track test of the whole vehicle, and the matched concrete foundation structure size of the test table matched with the running of the whole vehicle is established. The steel bar support is used as a concrete foundation steel bar member, and is used as a horizontal and vertical three-dimensional anti-cracking steel bar net and a bidirectional slow bonding prestress anti-cracking anti-vibration bar installation benchmark, so that the construction is rapid and efficient. And the high-strength screw is adopted to integrally mount the iron bottom plate of the test bed and the embedded part 6 in the concrete through secondary grouting adjustment and final precision, so that the mounting stability of test equipment is improved, and the vibration resistance of the mounting surface of the equipment is improved. The concrete thick protective layer area on the mounting surface of the embedded part 6 is provided with phi 6@100×100 anti-cracking reinforcing steel meshes so as to increase the anti-cracking and anti-vibration performance of the surface concrete. The early expansion effect and the later contraction factor of the concrete are considered to establish that the anti-cracking fiber is added to replace the conventional micro-expansion agent, so that the anti-cracking of the mass concrete of the vibrating table is enhanced. The experimental research is used for determining the construction easiness which is suitable for the large-volume concrete foundation of the vibrating table and the comprehensive anti-cracking, anti-permeability and anti-vibration measures of the system, such as the mixing ratio for improving the crack resistance, the optimal raw material combination scheme for researching trial-mix determination, and the like, so that the technical problem of high difficulty of the anti-seepage and anti-cracking large-volume concrete foundation of the vibrating table in the whole-vehicle running test of the high-speed magnetic levitation train is solved and the technical blank is filled.
While the embodiments of the present application have been described in detail with reference to the examples, the present application is not limited to the above embodiments, and it will be apparent to one skilled in the art that several equivalent changes and substitutions can be made therein without departing from the principles of the present application, and such equivalent changes and substitutions should also be considered to be within the scope of the present application.
Claims (7)
1. The method for constructing the impervious anti-crack concrete foundation of the vibration table of the whole test of the high-speed magnetic levitation train comprises a whole test train and a levitation platform, wherein the whole test train is arranged on the levitation platform; the concrete foundation comprises a concrete body, a vibrating table and a vibrator; the method is characterized in that the size of the concrete foundation structure is matched with that of the maglev train; the concrete body is provided with a groove structure, the vibrating table is arranged in the groove, and the upper end of the vibrating table is fixedly connected with the bottom side of the suspension platform; the bottom and the wall of the concrete body groove are respectively provided with a vibrator, and one end of the vibrator is respectively connected with the bottom end and the side surface of the vibrating table; according to the vibrator installation position of the concrete body, the construction method of the concrete foundation is to construct the concrete body Shi Gongfen in a multi-layer distribution mode, and the method comprises the following steps:
s1, excavating and supporting a foundation pit; ensuring the safety of soil around the foundation pit, cleaning the bottom of the foundation pit, measuring and paying off, paving a broken stone water filter layer before pouring a cushion layer, and then pouring the cushion layer and constructing a bottom waterproof layer;
s2, layering and gradually erecting a full-hall reinforcing steel bar support at the bottom of the foundation pit of the S1; after each layer of steel bar support is erected, binding horizontal anti-cracking steel bars at intervals along the radial direction by taking the steel bar support as an erection standard to form a horizontal and vertical three-dimensional anti-cracking steel bar net; in the process of binding the reinforcing steel bars, a cooling water pipe is pre-buried and installed;
s3, after the construction of the steel bar support and the steel bar net in the S2 is completed, vertical prestress anti-cracking steel bar installation is carried out; when in installation, the steel bar bracket is taken as a erection reference, vertical prestressed anti-cracking steel bars are bound at intervals along the horizontal direction to form a horizontal and vertical bidirectional anti-cracking steel bar net, and the embedding work of the temperature measuring element is synchronously carried out to form a concrete body pouring steel bar complex; when binding vertical prestressed anti-cracking steel bars, the prestressed anti-cracking steel bars adopt slow-binding prestressed anti-cracking steel bars; in the binding process, when the distance between the steel bar brackets is large, the fixing cross bars are arranged at intervals between the steel bar brackets to be used as auxiliary fixing pieces of vertical anti-cracking steel bars to be bound with the steel bar brackets;
s4, installing templates step by step in layers and pouring concrete; in the pouring process, the reinforced bar complex in the S3 is divided into a basic section and an upper section along the radial direction by using the position of the embedded part of the concrete body installation test equipment; firstly, installing a template of a foundation section, pouring concrete, and maintaining; after the foundation section is constructed, installing a template of the upper section, pouring concrete and maintaining; when the upper section is constructed, the embedded part is firstly installed and used for installing test equipment after concrete pouring is completed; completing the construction of all concrete bodies; when concrete pouring is carried out, the foundation section is the lower concrete body; firstly, installing a template of a lower concrete body, and pouring concrete; when the upper section is constructed, concrete pouring is carried out on the steel bar complex according to layered distribution of the middle layer and the upper layer; when the embedded part is installed, positioning is carried out by using a surveying instrument, and the embedded part is fixed and tightly propped by using a fixing part, so that the embedded part and the steel bar support are connected into a whole; arranging a metal bottom plate at the outer leakage part of the embedded part, and fixedly connecting the metal bottom plate with the embedded part by penetrating through the embedded part through a mounting screw; when curing after concrete pouring is carried out, carrying out a temperature test to guide concrete curing, wherein the surface temperature difference in the concrete pouring body is not more than 20 ℃, and the cooling rate of the concrete pouring body is not more than 2.0 ℃/d; the use temperature of the cement for discharging is below 60 ℃;
s5, after the construction of all concrete bodies is completed, tissue quality inspection and acceptance are carried out, test equipment including a vibrating table and a vibrator is installed, secondary grouting is carried out on the test equipment and the embedded part, and final installation accuracy is adjusted; and finishing the construction of all concrete foundations.
2. The method for constructing the impervious anti-crack concrete foundation of the vibration table for the whole test of the high-speed maglev train, which is characterized by comprising the following steps of: when a full-hall steel bar bracket is erected in S2, dividing the concrete body into an upper layer, a middle layer and a lower layer according to the installation position of the concrete body test equipment; the upper layer is a concrete body area from the bottom of the groove to the top of the groove; the middle layer is a concrete body area which downwards covers the embedded part of the groove bottom test equipment along the groove bottom; the lower layer is a residual concrete body area.
3. The method for constructing the anti-seepage and anti-cracking concrete foundation of the vibration table for the whole test of the high-speed maglev train is characterized by comprising the following steps of: when a full-hall steel bar bracket is erected in S2, the steel bar bracket is made of section steel, and the section steel comprises a stand column, a large cross bar and a small cross bar; binding a layer of foundation reinforcement at the bottom of a foundation pit before the lower concrete body reinforcement bracket is installed, and binding reinforcement after the installation of the lower concrete body reinforcement bracket is completed to form a construction of a horizontal and vertical three-dimensional reinforcement net of the lower concrete body; and then sequentially completing binding the reinforcing steel bar brackets and the reinforcing steel bars of the middle-layer concrete body and the upper-layer concrete body, and binding the reinforcing steel bars of the upper-layer concrete body and the equipment by adopting shear pier reinforcing steel bars when the upper-layer concrete body is bound.
4. The method for constructing the impervious anti-crack concrete foundation of the vibration table for the whole test of the high-speed maglev train, which is characterized by comprising the following steps of: and when the embedded part is installed in the S4, adding a phi 6@100×100 anti-cracking reinforcing steel mesh to the installation surface of the embedded part.
5. The method for constructing the impervious anti-crack concrete foundation of the vibration table for the whole test of the high-speed maglev train, which is characterized by comprising the following steps of: before S4, concrete pouring is carried out, a trial-mix concrete raw material assembly test is carried out according to the design requirement of the concrete body; the determining of the raw material composition comprises: and (3) cement: ordinary Portland cement, PO42.5 grade; coarse aggregate: the stone is basalt, and the continuous grading is 5.0 mm-25.0 mm; fine aggregate: the specification of the water-washed quartz river sand is middle sand, the fineness modulus is 2.7, and the mud content is 2%; water reducing agent: the polycarboxylic acid type water reducer is adopted as a special additive for concrete foundation, and the addition ratio is 2.5-3.0%; fly ash: the specification is grade II, and the quality meets the current national standard; mineral powder: the specification is S95 grade, and the quality meets the current international standard; water: low temperature water 10 ℃.
6. The method for constructing the anti-seepage and anti-cracking concrete foundation of the vibration table for the whole test of the high-speed maglev train, which is characterized by comprising the following steps of: and (3) through repeated trial and error experiments, determining the mixing ratio of the concrete body for implementing casting concrete as follows: cement 21kg/m3; 101kg/m3 of fly ash; 162kg/m3 of tap clean water; coarse aggregate 9.5-25 mm 717kg/m3, 4.75-9.5 mm 300kg/m3; river sand 756kg/m3; 9kg/m3 of water reducer; the crack resistance fiber is 1kg/m3.
7. The method for constructing the impervious anti-crack concrete foundation of the vibration table for the whole test of the high-speed maglev train, which is characterized by comprising the following steps of: when the quality inspection is carried out in S5, PS42.5 slag cement is adopted, the concrete strength is 60d strength as an acceptance index, and the quality inspection is carried out by adopting a method for reducing the consumption of cement and mineral powder.
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