CN114182753A - Subway station assembled middle plate structure and construction method thereof - Google Patents
Subway station assembled middle plate structure and construction method thereof Download PDFInfo
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- CN114182753A CN114182753A CN202111290616.3A CN202111290616A CN114182753A CN 114182753 A CN114182753 A CN 114182753A CN 202111290616 A CN202111290616 A CN 202111290616A CN 114182753 A CN114182753 A CN 114182753A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
Abstract
An assembled middle plate structure of a subway station and a construction method thereof comprise a plurality of criss-cross supporting beams and prefabricated plates, wherein the criss-cross supporting beams enclose a plurality of laying areas, a prefabricated plate group is arranged in each laying area and consists of one or more than two prefabricated plates which are connected end to end, a support is arranged on the inner side of each supporting beam, an acrylate spraying layer is arranged on each support, and the prefabricated plates are pressed on the acrylate spraying layer; gaps are formed between the peripheral side surfaces of the prefabricated plate group and the side surfaces of the supporting beams, a third acrylate spraying layer is arranged in the gaps, two adjacent prefabricated plates in the prefabricated plate group are mutually tensioned and connected through connecting pieces, and fourth acrylate spraying layers are arranged on the opposite end surfaces of the adjacent prefabricated plates. The invention adopts an acrylate spraying method to adapt to waterproof sealing at various joints of the assembled structure, and solves the problem of water leakage of the joints of the assembled middle plate structure.
Description
Technical Field
The invention relates to the field of underground engineering waterproofing, in particular to an assembled middle plate structure of a subway station and a construction method thereof.
Background
In recent years, the waterproof research results of foreign related underground engineering are less, which is related to environmental conditions and infrastructure construction conditions of various countries; the recent research achievements in China are rich, tunnels, subways, utility tunnel and various underground spaces are covered, the waterproof research is mostly carried out on external enclosure systems, such as bottom plates, side walls, top plates and other parts by adopting a full-wrapping or full-covering waterproof method, the method comprises the steps that the top plate of an assembled subway station and a prefabricated pipe gallery are still waterproof in a full-wrapping mode, and only the segments of the shield technology are sealed and waterproof by adopting seam connection. From the trend of waterproof technology, single waterproof is developed to composite waterproof, and paving and spraying are combined, caulking and construction are combined, material waterproof and self-waterproof are combined, and the like. The existing report on the acrylate film-spraying waterproof technology is systematic and comprehensive from the research results, and comprises various aspects of performance, process, equipment, durability, adaptability, reliability and the like, the technology tends to be mature, the adaptability in the waterproof field of underground engineering is strong, the characteristics are prominent, and the technology is a technology which is developed quickly and is novel in recent years. On the other hand, the concept of green and sustainable development begins to gradually penetrate into underground engineering, and new requirements are provided for the development of waterproof technology from the low-carbon perspective. At present, the waterproof research on the prefabricated assembled structure is incomplete, the waterproof research results of high-level assembled underground engineering are few, and the waterproof research results of the plate system in the assembled structure of the underground engineering, namely the waterproof research results of the internal structure of a building are not reported, which shows that the application of the prefabricated assembled plate structure is just started and the problem concerned by the industry is not shown; and secondly, the middle plate belongs to indoor floor engineering from the traditional waterproof perspective, and the waterproof necessity of the middle plate does not pay attention to the engineering boundary.
Firstly, the sources of water in the facilities are diversified, and if the building surface water is possibly formed by leakage caused by improper use and maintenance of various water supply and drainage equipment, inflow of urban waterlogging in rainy season, deformation and cracking of the building enclosure caused by load and geological condition change, maintenance and cleaning of the facilities and the like, the water in the interior of the building surface also has waterproof requirements; secondly, the country proposes to develop assembly type buildings vigorously, the subway station design of the assembly type structure gradually enters engineering application, and a large number of seams exist in the assembly type components, so that the structure is complex, and the waterproof requirement and the water leakage mechanism are different from those of a cast-in-place structure. Thirdly, subway stations have dense pedestrian flow and various devices, and various functional spaces connected by taking subways as links are more and more complicated, so that if the slab structure in the floor generates leakage, the normal use of various facilities is influenced, potential safety hazards are caused, and the application and development of the prefabricated structure in underground engineering are restricted. Therefore, the waterproof problem of the middle plate structure system cannot be avoided, and a new waterproof research subject is needed to fill the gap.
Disclosure of Invention
The invention aims to solve the technical problem of providing an assembled middle plate structure of a subway station and a construction method thereof, and solves the problem of water leakage at the joint of the assembled middle plate structure.
In order to solve the technical problems, the technical scheme of the invention is as follows: an assembled middle plate structure of a subway station comprises a plurality of criss-cross supporting beams and prefabricated plates, wherein the criss-cross supporting beams enclose a plurality of laying areas, a prefabricated plate group is arranged in each laying area and consists of one or more than two prefabricated plates which are connected end to end, a support is arranged on the inner side of each supporting beam, the base surface of each support is lower than the top surface of each prefabricated plate, two sides of each prefabricated plate group are arranged on the base surfaces of the supporting beams on two sides, two ends of each prefabricated plate group are arranged on the base surfaces of the supporting beams on two ends, and the top surfaces of the prefabricated plate groups are flush with the top surfaces of the prefabricated plate groups; a first acrylate spraying layer is arranged on the support base surface of the side supporting beam of the prefabricated plate group, a second acrylate spraying layer is arranged on the support base surface of the end supporting beam of the prefabricated plate group, gaps are formed between the side surfaces of the periphery of the prefabricated plate group and the side surfaces of the supporting beam, a third acrylate spraying layer is arranged in the gaps, and a filling layer is arranged above the third acrylate spraying layer in the gaps; two adjacent prefabricated plates in the prefabricated plate group are mutually tensioned and connected through a connecting piece, and the opposite end faces of the adjacent prefabricated plates are provided with fourth acrylate spraying layers.
Compared with the traditional design, the assembled structure system can obviously improve the engineering quality, accelerate the construction progress, reduce the work load of a large amount of templates, reinforcing steel bars and scaffolds on site, reduce the occupied area of a construction site, reduce manual operation, lighten the labor intensity and change the construction mode. The acrylate is instantly polymerized to form a colloid with stronger flexibility, the coating has good durability, reliable waterproof performance, good bonding with concrete and certain damage self-healing property, the spraying method is simple, convenient and quick, is suitable for various complex base planes, is not influenced by other process construction, can be operated on site, can meet the requirement of automatic spraying under the condition of factory tooling, and overcomes the problem that the traditional waterproof sealing material is easy to damage in construction and transportation. The waterproof material has certain expansibility when meeting water, so that the sealing and waterproof requirements of the structure are met; the waterproof material is nontoxic, odorless, low-carbon and environment-friendly, has fireproof and flame-retardant properties, and is suitable for construction in a closed environment.
As an improvement, the precast slabs are concrete slabs, wedge-shaped grooves are formed in one end or two ends of each precast slab, the wedge-shaped grooves in the end portions of two adjacent precast slabs correspond to each other, and the connecting pieces are arranged in the wedge-shaped grooves.
As an improvement, the connecting piece comprises a screw rod, pressing blocks arranged at two ends of the screw rod and nuts used for locking the pressing blocks, two ends of the screw rod extend into the wedge-shaped grooves of two adjacent prefabricated plates, and the two pressing blocks are respectively positioned in the wedge-shaped grooves of the two adjacent prefabricated plates.
As an improvement, the thickness of the first acrylate spraying layer and the second acrylate spraying layer is 3-10 mm.
As a refinement, the height of the third acrylate sprayed layer is not less than 20 mm.
As an improvement, the thickness of the fourth acrylate spraying layer is 3-5 mm.
The construction method comprises the following steps:
(1) the method comprises the following steps that a criss-cross supporting beam is cast in place by concrete or is built by welding a steel structure;
(2) spraying an acrylate waterproof material on a support base surface of a support beam on the side surface of the prefabricated plate group to form a first acrylate spraying layer;
(3) spraying acrylate waterproof materials on the support base surface of the support beam on the end face of the prefabricated plate group to form a second acrylate spraying layer;
(4) spraying an acrylate waterproof material on the end face of the connecting end of the precast slab to form a fourth acrylate spraying layer;
(5) hoisting the precast slabs to a laying area formed by the criss-cross support beams, and reserving gaps between the side surfaces of the precast slabs and the side surfaces of the support beams;
(6) utilizing a connecting piece to mutually tighten and connect two adjacent prefabricated plates so as to mutually extrude the fourth acrylate spraying layers on the end surfaces of the adjacent prefabricated plates;
(7) spraying acrylate waterproof material in the gap to form third acrylate spraying;
(8) and adding a filling material above the third acrylate sprayed layer in the gap to form a filling layer.
Compared with the prior art, the invention has the following beneficial effects:
compared with the traditional design, the assembled structure system can obviously improve the engineering quality, accelerate the construction progress, reduce the work load of a large amount of templates, reinforcing steel bars and scaffolds on site, reduce the occupied area of a construction site, reduce manual operation, lighten the labor intensity and change the construction mode. The acrylate is instantly polymerized to form a colloid with stronger flexibility, the coating has good durability, reliable waterproof performance, good bonding with concrete and certain damage self-healing property, the spraying method is simple, convenient and quick, is suitable for various complex base planes, is not influenced by other process construction, can be operated on site, can meet the requirement of automatic spraying under the condition of factory tooling, and overcomes the problem that the traditional waterproof sealing material is easy to damage in construction and transportation. The waterproof material has certain expansibility when meeting water, so that the sealing and waterproof requirements of the structure are met; the waterproof material is nontoxic, odorless, low-carbon and environment-friendly, has fireproof and flame-retardant properties, and is suitable for construction in a closed environment.
Drawings
Fig. 1 is a partial schematic view of an assembled middle plate structure.
Fig. 2 is a longitudinal section through a pavement area.
Fig. 3 is an enlarged view of fig. 2 at a.
Fig. 4 is an enlarged view of fig. 2 at B.
Fig. 5 is a transverse cross-sectional view of a paved area.
Fig. 6 is an enlarged view of fig. 5 at C.
Fig. 7 is a construction flow chart of an assembled middle plate structure.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the assembled middle plate structure of the subway station comprises a plurality of criss-cross supporting beams 1 and prefabricated plates 2, wherein the criss-cross supporting beams 1 enclose a plurality of laying areas, a prefabricated plate group is arranged in each laying area, and the prefabricated plate group is composed of one or more than two prefabricated plates 2 which are connected end to end.
As shown in fig. 1, 2 and 4, the precast slab 2 is a concrete slab, and the size of length × width × thickness is 3400mm × 2800mm × 300 mm. Two adjacent prefabricated plates 2 in the prefabricated plate group are mutually tensioned and connected through a connecting piece 8, one end or two ends of each prefabricated plate 2 are provided with wedge-shaped grooves, and the wedge-shaped grooves at the end parts of the two adjacent prefabricated plates 2 correspond to each other; the connecting piece 8 comprises a screw rod, pressing blocks arranged at two ends of the screw rod and nuts used for locking the pressing blocks, two ends of the screw rod extend into the wedge-shaped grooves of the two adjacent prefabricated plates 2, and the two pressing blocks are respectively positioned in the wedge-shaped grooves of the two adjacent prefabricated plates 2.
As shown in fig. 2 to 6, the support beam 1 may be formed by cast-in-place concrete or welded and built steel structure, a support 6 is arranged on the inner side of the support beam 1, the base surface of the support 6 is lower than the top surface of the precast slab 2, two sides of the precast slab group are arranged on the base surfaces of the supports 6 of the support beams 1 on two sides, two ends of the precast slab group are arranged on the base surfaces of the supports 6 of the support beams 1 on two ends, and the top surface of the precast slab group is flush with the top surface of the precast slab group. A first acrylate spraying layer 10 is arranged on the base surface of a support 6 of the side support beam 1 of the prefabricated plate group, and the thickness of the first acrylate spraying layer 10 is 3-10 mm; a second acrylate spraying layer 3 is arranged on the base surface of the support 6 of the end face support beam 1 of the prefabricated plate group, and the thickness of the second acrylate spraying layer 3 is 3-10 mm; in the embodiment, the height of the base surface 6 of the support 6 of the side support beam 1 of the prefabricated plate group is 5mm lower than that of the base surface 6 of the end support beam 1, the thickness of the first acrylate spraying layer 10 on the base surface 6 of the side support is 10mm, the thickness of the second acrylate spraying layer 3 on the base surface 6 of the end support is 5mm, and the waterproof layer of the base surface 6 of the support is ensured to be flat; when the prefabricated plate is installed in place, the waterproof layer is extruded to achieve a waterproof sealing effect, the minimum film spraying thickness is not smaller than 5mm in consideration of flatness errors of a prefabricated plate support 6, the periphery of the prefabricated plate is sealed in a waterproof mode, when the errors reach 5mm, the protruding portion extrudes the periphery of a flexible waterproof layer net through the self weight of the prefabricated plate, the plate bottom can be attached to the waterproof layer in a closely attached mode, and the performance of a polyacrylate waterproof material expanding when meeting water can prevent permeation of non-pressure water. Gaps are formed between the side surfaces of the periphery of the prefabricated plate group and the side surfaces of the supporting beams 1, a third acrylate spraying layer 4 is arranged in the gaps, when the error is larger than 5mm, gaps can be generated at the bottom of the prefabricated plate due to unevenness of supporting points, acrylate waterproof materials are injected into the reserved gaps at the periphery in a spraying mode, a vertical waterproof grouting layer is formed in the side gaps between the prefabricated plate and the supporting seat 6, the height of the grouting layer is not smaller than 20mm, the bottom plate gaps are completely covered, meanwhile, the polymerization time of the materials is adjusted, the waterproof materials are enabled to have certain leveling after being injected into the gaps, the waterproof materials are enabled to be injected into the gaps and not to flow out of the gaps, and the reliable waterproof sealing effect is achieved; and a filling layer 5 is arranged above the third acrylate spraying layer 4 in the gap, and the filling layer 5 is a concrete layer and used for plugging the side gap. Arranging a vertical waterproof belt at a joint between two prefabricated plates, considering that the existing prefabricated plate structure is subjected to mortise-tenon joint between the two prefabricated plates, arranging the waterproof layer in a range of 100mm wide upwards along the bottom edge of a joint vertical surface of the prefabricated plates, and enabling the thickness of the waterproof layer to be not less than 5 mm; as the precast slabs are not provided with the grooves and tongues of the waterproof layer, the opposite end surfaces of the adjacent precast slabs are provided with the fourth acrylate spraying layer 9 with the thickness of 3 mm.
As shown in fig. 7, the construction method of the present invention includes the steps of:
(1) the method comprises the following steps that a criss-cross support beam 1 is cast in place by concrete or the criss-cross support beam 1 is built by welding a steel structure;
(2) spraying an acrylate waterproof material on the base surface of the support 6 of the support beam 1 on the side surface of the prefabricated plate group to form a first acrylate spraying layer 10;
(3) spraying acrylate waterproof materials on the base surface of the support 6 of the end face support beam 1 of the prefabricated plate group to form a second acrylate spraying layer 3;
(4) spraying an acrylate waterproof material on the end face of the connecting end of the precast slab to form a fourth acrylate spraying layer 9;
(5) hoisting the precast slabs to a laying area formed by the criss-cross support beams 1, and reserving gaps between the side surfaces of the precast slabs and the side surfaces of the support beams 1;
(6) utilizing a connecting piece to mutually tighten and connect two adjacent prefabricated plates so as to mutually extrude the fourth acrylate spraying layers 9 on the end surfaces of the adjacent prefabricated plates; after the prefabricated plates are installed in place, connecting bolts are arranged by using the wedge-shaped grooves of the prefabricated plates, and the waterproof films are pressed by using the pressure generated between the seams of the prefabricated plates by adopting the screw tension generated by fastening the bolts; the bolt is fastened by adopting a torque wrench, the distance between the two plates generates displacement of about 1.4mm, the maximum torque value is 250N/m, and due to the adhesive force and the friction force generated by acrylate and concrete, when the bolt is loosened, the two plates can not extrude the waterproof layer of the plate joint, and the screw fastening bolt can be applied permanently and also can be used as a temporary construction pressurizing means;
(7) spraying an acrylate waterproof material in the gap to form a third acrylate spraying layer 4, wherein the height of the third acrylate spraying layer 4 is not less than 20mm, and adjusting the polymerization time of the acrylate waterproof material during grouting to ensure that the material has certain leveling after being injected into the gap, so that the material is injected into the gap and cannot flow out of the gap;
(8) a filler material was added to the gap above the third acrylate sprayed layer 4 to form a filler layer.
Support 6 and board seam waterproof layer will be before hoist and mount on-the-spot spraying, and the spraying operation is accomplished 24 hours before hoist and mount, and board seam both sides waterproof layer link up the setting along the board seam, extends to the distolateral 100mm of corner, and this waterproof layer requires that spraying thickness is even, and thickness error is less than 1mm, and when the error was greater than 1mm, the adoption manual work was polished and is made level.
The thickness of the waterproof membrane of the joint between the two plates is 6mm, the waterproof membrane is realized by respectively spraying 3mm on two surfaces, the waterproof membrane is easy to realize in process, the bonding effect with the concrete base surface is good when the waterproof membrane is sprayed, and the bonding between the acrylate membrane and the membrane after the waterproof membrane is solidified is better than the bonding between the membrane and the concrete after the waterproof membrane is fastened and extruded by bolts.
The waterproof membrane of support 6 spraying 5mm thick can reach basically and go high benefit low through the compression of waterproof membrane when the prefabricated construction has certain error, guarantees the waterproof performance when 6 less unevenness of support and membrane thickness are inhomogeneous.
When the flatness error of the support 6 is large, the grouting sealing operation of the side seam is obvious, when the polymerization time is adjusted to 5s, the sufficient leveling effect can be generated, an integral sealing strip which is well adhered to two sides of the bottom is formed in the side seam, the integral sealing strip is in waterproof combination with the support 6 seam spray film, the I-level waterproof design requirement is met, and the minimum height is determined according to the seam width and the polymerization time.
The acrylic salt waterproof material adopted by the invention is a bi-component film-spraying waterproof material, and comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 100 parts of acrylate monomer solution, 0.5-5 parts of modified silicone, 0.01-0.1 part of hydroxyethyl urea and 5-20 parts of filler; the component B comprises the following raw materials in parts by weight: 100 parts of acrylate monomer solution, 0.5-5 parts of modified silicone, 0.01-0.1 part of hydroxyethyl urea and 5-20 parts of filler.
For the prefabricated concrete structure slab system, as long as the waterproof sealing is performed on the floating water without osmotic pressure on the floor surface, the concrete prefabricated part has waterproof capability to ensure that the beam slab concrete has no leakage, and the slab joint and the support 6 structure are the key of waterproofing. The acrylate spraying method is adopted to adapt to waterproof sealing at various joints of the assembled structure; the invention determines a set of waterproof technology with simple and convenient construction and reliable effect, and the influence of acrylate film spraying and waterproofing on related procedures is very small from the aspects of material performance, construction process and operation process, so that the waterproof technology is suitable for being completed on site; the 6 base planes of the support can be subjected to film spraying construction before installation, the secondary sealing of a vertical seam pouring method can be carried out after the installation when the base planes are not flat, the combination of the 2 methods can meet the I-level waterproof requirement, and the reliability is greatly improved.
Water resistance test
1. Load test and water shut-off test
The prefabricated slab B1 and B2 are used for simulating the assembled middle slab structure, in order to simulate the relative maximum deformation of the joint of the two slabs, only the slab B1 is loaded, a 1.5m3 concrete test block is used for loading, the weight of each block is 3200kg, the loading is carried out twice, 2 blocks are loaded each time, and the loading interval is 2 weeks after 2 times. The water-blocking test was continued after the side seam was filled with acrylate, and immediately after no water leakage, the plate B1 was loaded for the first time. After 48 hours of water closing test, the water is removed and placed for 12 days, the drying and shrinkage conditions of the waterproof membrane under the natural condition of exposure to the sun are inspected, then the second loading is carried out, the 48 hours of water closing test is carried out, the water is naturally placed after being drained, and the continuous water closing test is carried out after 3 weeks
Loading and closing water condition recording table:
2. analysis of waterproof film hardness and dry-wet cycle influence
The dry-wet cycle from unbalanced loading to water closing test shows that no water leakage phenomenon is found after the side seam spraying grouting is adopted for water prevention, the hardness is 4.0 when the film spraying is finished, the hardness is 8.7 in 24 hours, the film is naturally placed for 2 weeks, the highest hardness reaches 29.5 when the 2 nd load is added, and no water leakage exists after the loading. When the waterproof membrane is naturally placed for 3 weeks at most, the exposed part of the waterproof membrane is obviously hardened, and the shore hardness of the exposed part reaches about 36.0 from 8.0 (measured from 24 hours after water is drained) and then the waterproof membrane is closed and has no leakage. Indicating that the waterproof performance of the waterproof membrane is not affected in the conditions of dry-wet cycle, structural deformation and the like. During installation, the hardness of the waterproof film is controlled to be 5-8, so that the waterproof film is not easy to damage under the extrusion effect, and a gap caused by unevenness of a base surface or a sprayed film can be adjusted through deformation.
Waterproof film light-resistant placed hardness change meter
3. Waterproof mechanism of acrylate waterproof film after water loss and dry and hard
Through field observation, the Shore hardness of the acrylate waterproof film reaches 36 and the acrylate waterproof film has certain toughness after the acrylate waterproof film is naturally placed in a dry environment for 3 weeks. When the waterproofing membrane is sandwiched between the prefabricated panel and the support 6, the dryness is limited to the edge exposed part, and the waterproofing membrane in the middle part is slightly affected by the outside dryness and humidity. The waterproof film is only tangentially deformed and cannot be separated from concrete due to normal phase deformation, and a section of high-density hardening section is generated when the dry and hard area at the outer edge of the waterproof film is 3-4mm thick, so that the effect of preventing moisture from continuing to evaporate is achieved, and the internal waterproof film can be ensured to be in a flexible state for a long time. The width of the support 6 and the prefabricated plate waterproof membrane reaches 100mm, even if 5mm dry and hard areas are generated on two sides of the exposed part of the joint, 90mm flexible areas still maintain the optimal waterproof performance of the waterproof membrane, and the mechanism that the waterproof membrane can adapt to loading deformation under dry and wet circulation conditions and cannot generate leakage is also adopted. From the dry-wet cycle, even if the waterproof membrane is dry and hard, the waterproof membrane returns to the original state after absorbing water, and the appearance and the mechanical property of the membrane are not changed.
4. Load and deformation observation
Since the influence of the relative deformation between the two plates on the waterproof sealing is mainly considered in the deformation observation, the influence of the dead weight is not considered, and the deformation before loading is taken as an initial value.
Loading deformation observation value table
The deformation of the support 6 of the table plate B1 is generated by the compression of the waterproof layer, and the span-center measured deformation value minus the measured deformation value of the support 6 is the span-center measured deformation value of the loaded precast slab.
5. Analysis of test results
Through the whole process test and 2 months of observation, 2 times of loading tests are carried out, the conversion of loading test blocks, the dead weight of the plate, the closed water load of 0.1 meter and the like is slightly higher than the design load value, and the design load can be simulated. The cumulative deformation value after the 1 st loading is 1.18mm, the cumulative deformation value after the 2 nd loading is 0.94mm, the cumulative deformation value of the plate B1 after the loading is 2.12mm, the cumulative deformation value of the plate B2 is 0.03mm, and the maximum deformation difference value of the plate B1 and the plate B2 is 2.09 mm.
When the shear deformation reaches 2.5mm, namely, the shear deformation exceeds 25 percent of the seam width, the leakage phenomenon begins to appear, and the design value of the seam width in the model test is 6 mm. The span deformation value of the plate B1 is only an accurate value which is not a plate structure when measured, is influenced by the fact that the base surface of the support 6 is uneven, even the edges of the two supports 6 are not in the same plane, is influenced by the warping of the plate besides the uneven compression deformation of the waterproof membrane, and is smaller than the allowable deformation value 1/500 span. The water leakage phenomenon is not generated in the whole process of 2 times of loading and the water closing test of 2 times of dry-wet circulation, which shows that the waterproof sealing effect of the acrylate waterproof film is not influenced under the condition of maximum deformation generated by dry-wet and unbalanced loading. Before the plate B1 is subjected to secondary loading, the relative deformation value of the plate B2 is zero, namely the plate B2 is not influenced by the primary loading, and under the bolt fastening action, when the load value is small, the transmitted shearing force is small, and the deformation of the two plates can be considered to be independent; the deformation of 0.03-0.04 mm is generated in 2 times of loading, which shows that under the bolt fastening action, the acrylate waterproof film between the two plate joints generates adhesive force, the natural placement for 2 weeks improves the hardness and toughness of the waterproof film, and certain shearing force can be transmitted, so that the plate B2 generates micro deformation. It is also stated that the waterproof film bonding between the panel seams facilitates the cooperation between the panels.
Claims (10)
1. The utility model provides a subway station assembled medium plate structure which characterized in that: the prefabricated plate group comprises a plurality of criss-cross supporting beams and prefabricated plates, wherein the criss-cross supporting beams surround a plurality of laying areas, a prefabricated plate group is arranged in each laying area, the prefabricated plate group consists of one or more than two prefabricated plates which are connected end to end, a support is arranged on the inner side of each supporting beam, the base surface of the support is lower than the top surface of each prefabricated plate, two sides of the prefabricated plate group are arranged on the base surfaces of the support of the supporting beams on two sides, two ends of the prefabricated plate group are arranged on the base surfaces of the support beams on two ends, and the top surface of the prefabricated plate group is flush with the top surface of the prefabricated plate group; a first acrylate spraying layer is arranged on the support base surface of the side supporting beam of the prefabricated plate group, a second acrylate spraying layer is arranged on the support base surface of the end supporting beam of the prefabricated plate group, gaps are formed between the side surfaces of the periphery of the prefabricated plate group and the side surfaces of the supporting beam, a third acrylate spraying layer is arranged in the gaps, and a filling layer is arranged above the third acrylate spraying layer in the gaps; two adjacent prefabricated plates in the prefabricated plate group are mutually tensioned and connected through a connecting piece, and the opposite end faces of the adjacent prefabricated plates are provided with fourth acrylate spraying layers.
2. The assembled middle plate structure of a subway station as claimed in claim 1, wherein: the prefabricated slab is a concrete slab, wedge-shaped grooves are formed in one end or two ends of the prefabricated slab, the wedge-shaped grooves in the end portions of two adjacent prefabricated slabs correspond to each other, and the connecting piece is arranged in each wedge-shaped groove.
3. The assembled middle plate structure of a subway station as claimed in claim 2, wherein: the connecting piece comprises a screw rod, pressing blocks arranged at two ends of the screw rod and nuts used for locking the pressing blocks, two ends of the screw rod extend into the wedge-shaped grooves of the two adjacent prefabricated plates, and the two pressing blocks are respectively positioned in the wedge-shaped grooves of the two adjacent prefabricated plates.
4. The assembled middle plate structure of a subway station as claimed in claim 1, wherein: the thickness of the first acrylate spraying layer and the second acrylate spraying layer is 3-10 mm.
5. The assembled middle plate structure of a subway station as claimed in claim 1, wherein: the height of the third acrylate sprayed layer is not less than 20 mm.
6. The assembled middle plate structure of a subway station as claimed in claim 1, wherein: the thickness of the fourth acrylate spraying layer is 3-5 mm.
7. A construction method of an assembled type middle plate structure of a subway station as claimed in claim 1, comprising the steps of:
(1) the method comprises the following steps that a criss-cross supporting beam is cast in place by concrete or is built by welding a steel structure;
(2) spraying an acrylate waterproof material on a support base surface of a support beam on the side surface of the prefabricated plate group to form a first acrylate spraying layer;
(3) spraying acrylate waterproof materials on the support base surface of the support beam on the end face of the prefabricated plate group to form a second acrylate spraying layer;
(4) spraying an acrylate waterproof material on the end face of the connecting end of the precast slab to form a fourth acrylate spraying layer;
(5) hoisting the precast slabs to a laying area formed by the criss-cross support beams, and reserving gaps between the side surfaces of the precast slabs and the side surfaces of the support beams;
(6) utilizing a connecting piece to mutually tighten and connect two adjacent prefabricated plates so as to mutually extrude the fourth acrylate spraying layers on the end surfaces of the adjacent prefabricated plates;
(7) spraying acrylate waterproof material in the gap to form a third acrylate spraying layer;
(8) and adding a filling material above the third acrylate sprayed layer in the gap to form a filling layer.
8. The construction method of the assembled middle plate structure of the subway station as claimed in claim 7, wherein: in the step (7), the height of the third acrylate spraying layer is not less than 20mm, and the polymerization time of the acrylate waterproof material is adjusted during grouting, so that the material has a certain leveling property after being injected into the gap, and the material is standard that the material is injected into the gap and cannot flow out of the gap.
9. The construction method of the assembled middle plate structure of the subway station as claimed in claim 7, wherein: the height of the base surface of the support beam on the side surface of the prefabricated plate group is 5mm lower than that of the support surface of the support beam on the end surface of the prefabricated plate group, and the thickness of the first acrylate spray coating is 5mm thicker than that of the second acrylate spray coating.
10. The construction method of the assembled middle plate structure of the subway station as claimed in claim 7, wherein: the thickness requirement of acrylate spraying layer is even, if the thickness error is greater than 1mm, adopt artifical polishing to make level.
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