CN112976256A - Production process of prestressed concrete laminated slab bottom plate - Google Patents
Production process of prestressed concrete laminated slab bottom plate Download PDFInfo
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- CN112976256A CN112976256A CN202110164211.9A CN202110164211A CN112976256A CN 112976256 A CN112976256 A CN 112976256A CN 202110164211 A CN202110164211 A CN 202110164211A CN 112976256 A CN112976256 A CN 112976256A
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- bottom plate
- prestressed
- laminated slab
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/04—Exhausting or laying dust
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/08—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads
- B28B11/0818—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads for roughening, profiling, corrugating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/046—Post treatment to obtain pre-stressed articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/384—Treating agents
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention belongs to the technical field of building material processing and application, and particularly relates to a production process of a prestressed concrete laminated slab base plate. The method comprises the following effective steps: cleaning the surfaces of a die table and a die; spraying a release agent; laying and tensioning prestressed steel bars, and placing a steel bar framework and a mould; pre-burying water and electricity; casting concrete; coarse smearing; napping; maintaining and placing a lifting appliance; breaking the prestressed reinforcement; removing the mold; finished products, transferring, stacking and the like. According to the invention, the existing production process is improved, so that the lifting appliance is added before the prestressed reinforcement is broken to form multi-point support for the plate body, and further the problems of plate surface warpage and cracking of the laminated slab bottom plate caused by the broken prestressed reinforcement are avoided; in addition, the superimposed sheet only needs two ends to support in the stacking and using process.
Description
Technical Field
The invention belongs to the technical field of building material processing and application, and particularly relates to a production process of a prestressed concrete laminated slab base plate.
Background
The truss reinforced concrete composite slab (hereinafter referred to as composite slab) is a better structural form combining prefabricated concrete and cast-in-place concrete, the prefabricated slab and an upper cast-in-place concrete layer are combined into a whole to work together, main reinforcements of a floor slab, namely main reinforcements of the composite slab, and the upper cast-in-place concrete layer is only provided with negative bending moment reinforcements and construction reinforcements. The bottom plate of the laminated slab can be used as a bottom die of a cast-in-place concrete layer, the bottom surface of the slab is smooth and flat, and after slab joints are treated, the ceiling is directly painted without plastering. In view of the above advantages, the laminated panels are being used in large areas in various residential and public works.
In the structure of common reinforced concrete, because the ultimate tensile strain of concrete is low, the strain of the steel bars in the member greatly exceeds the ultimate tensile strain of the concrete under the action of use load. The strength of the reinforcing steel bars in the reinforced concrete member is not fully utilized. Therefore, it is not reasonable to use high strength steel bars for the ordinary reinforced concrete structure. In order to make full use of high-strength materials and to make up for the difference between the tensile strain of concrete and reinforcing steel, people apply prestressing to reinforced concrete structures. That is, the reinforcing bars are previously stretched before an external load is applied to the structural member, thereby constructing a prestressed reinforced concrete structure. When the member bears the tensile force generated by the external load, the pre-pressure existing in the concrete is firstly counteracted, then the concrete is tensioned and then cracks appear along with the increase of the load, and therefore the appearance and the development of the cracks of the member are delayed.
The laminated slab bottom plate adopts a prestressed reinforced concrete structure, but the thickness of the laminated slab bottom plate is generally about 35-60 mm, and the use of prestressed reinforcement leads to the fact that the laminated slab bottom plate is easy to warp, and the laminated slab bottom plate is cracked due to the warping problem.
Disclosure of Invention
Aiming at the problem that the laminated slab bottom plate is easy to warp and break, the invention provides the production process of the prestressed concrete laminated slab bottom plate, which is simple in method and convenient to operate, can effectively avoid the warp of the laminated slab bottom plate, realize the production of the large-span laminated slab bottom plate, replace a steel bar truss, reduce the manufacturing cost, improve the efficiency, increase the stacking number in the manufacturing, transporting and field using processes of a factory, reduce the number of supports, realize the support at two ends and can be repeatedly used.
In order to achieve the purpose, the invention adopts the technical scheme that the invention provides a production process of a prestressed concrete laminated slab base plate, which comprises the following effective steps:
a. firstly, cleaning the surfaces of a die table and a die to ensure the cleanness of the surfaces of the die table and the die;
b. after the die table and the die are cleaned, spraying a release agent on the surface of the die table and strickling the release agent by a strickler to ensure the uniformity and the thickness of the release agent;
c. tensioning the prestressed reinforcement by using a tensioning device, and weaving a reinforcement framework;
d. placing the cleaned mould at the designated position of the mould table, and placing a steel reinforcement framework in the mould;
e. placing a hydroelectric installation pre-embedded device in the mould;
f. casting concrete into the mould and vibrating to ensure that no air bubbles and honeycombs exist;
g. roughly smearing the surface of the concrete to ensure that the surface is basically flat and has no stones leaked outside and no concave-convex phenomenon on the outer surface;
h. when the concrete reaches an initial setting state, roughening the surface of the concrete;
i. curing the concrete, after the concrete reaches a certain strength, placing a connecting hanging block around a hanging ring of the steel reinforcement framework, wrapping the hanging ring in the connecting hanging block, placing a hanging rod above the connecting hanging block, arranging the hanging rod along the length direction of the concrete, arranging a connecting bolt on the hanging rod, and hooking the connecting bolt on the hanging ring to ensure the tensioning state between the connecting bolt and the hanging ring;
j. after the strength of the concrete reaches 70% -75% of the standard maintenance strength, shearing the prestressed reinforcement, and enabling the concrete to generate pre-stress by means of the bonding of the concrete and the prestressed reinforcement;
k. disassembling the mould to separate the concrete and the mould;
l, obtaining a laminated slab bottom plate after the strength of the concrete reaches a certain strength;
m, then hook two points of jib on the superimposed sheet bottom plate, carry out hoist and mount transportation, stack to the superimposed sheet bottom plate.
Preferably, in the h step, the interval is provided with the connecting hole on the jib, the connecting hole runs through the jib setting, be provided with connecting bolt in the connecting hole, connecting bolt through connection hole sets up, connecting bolt is including being used for connecting bolt at the drag hook portion of rings and setting the bolt portion in drag hook portion top, the one end cover that screw portion stretches out the connecting hole is equipped with the nut, connecting bolt passes through the nut to be fixed on the jib.
Preferably, in the step h, a hoisting hole is formed in the connecting hoisting block, the hoisting hole penetrates through the connecting hoisting block, and the hoisting ring and the connecting bolt extend into the hoisting hole.
Preferably, in the step h, two hanger rods are arranged on the concrete, and the hanger rods are arranged along the long side direction of the concrete.
Preferably, in the step h, the connecting hanging block is made of concrete.
Preferably, in the step m, the laminated flooring is stacked by at least 7 layers.
Compared with the prior art, the invention has the advantages and positive effects that,
1. the invention provides a production process of a prestressed concrete laminated slab bottom plate, which improves the existing production process, so that a suspender is added before the prestressed reinforcement is broken to form multi-point support for a slab body, thereby avoiding the problems of warping and cracking of the slab surface of the laminated slab bottom plate caused by the broken line of the prestressed reinforcement; reduce and support quantity, in addition, the superimposed sheet bottom plate only need both ends support stacking and in the use can. And the composite slab bottom plate can be repeatedly used, the manufacturing cost is reduced, and a guarantee is provided for further popularization and use of the composite slab bottom plate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a process flow chart of a process for producing a bottom plate of a prestressed concrete composite slab provided in example 1;
FIG. 2 is a front view of a bottom plate of a laminated slab according to embodiment 1;
FIG. 3 is a side view of a bottom plate of a laminated slab provided in example 1;
in the above figures, 1, a laminated slab base plate; 11. a hoisting ring; 2. a boom; 21. connecting holes; 3. a connecting bolt; 31. a hook part is pulled; 32. a bolt portion; 4. a nut; 41. a connecting ring; 5. connecting the hanging blocks; 51. and (6) hoisting holes.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
The production process of the prestressed concrete laminated slab bottom plate provided by the embodiment comprises the following steps of:
the surface of the die table and the surface of the die are cleaned firstly, so that the cleanness of the die table and the surface of the die is ensured, and the cleanness of the die table and the surface of the die is ensured because the direct bottom painting is required to be realized in the later use of the bottom plate of the laminated slab, so that the cleanness of the die table and the surface of the die is ensured, and no concrete residue is ensured.
After the mold table and the mold are cleaned, the mold release agent on the surface of the mold table is scraped by a scraper, so that the uniformity and the thickness of the mold release agent are ensured, if the mold release agent has no special requirements, the water-based mold release agent is preferably selected, if the mold release agent is a common mold table, scribing may be needed before spraying the mold release agent, and the main purpose of scribing is to scribe the positions of a mold binding line and a hydroelectric embedded part.
And then, weaving the steel bar framework, wherein prestress needs to be applied to the steel bars, so that the two ends of the steel bars are clamped by using tensioning equipment, tension is applied to the steel bars, and after the tension is applied, the steel bar framework is woven according to the tensioned steel bars.
Then, the cleaned die is placed at the designated position of the die table, the die is fastened with the die table, the lower die and the die table are fixed in a bolt fixing mode, and then the steel reinforcement framework is placed in the die. It should be noted that, when placing the steel reinforcement framework, the tensioning device is not withdrawn.
And a pre-embedded device for hydroelectric installation is placed in the mould. When placing, must ensure the accuracy of pre-buried device direction, need seal in takeover department and box mouth department to advance thick liquid when preventing concrete placement and vibrating, after placing, need carry out relevant fixed to pre-buried device, avoid appearing crooked phenomenon.
And casting concrete into the mould and vibrating to ensure that no air bubbles or honeycombs exist, after casting, inspecting the mould and embedded parts, immediately processing if the phenomena of mould expansion, mould displacement or concrete entering in a plugging cavity occur, and once subsequent concrete is solidified, failing to process.
The surface of the concrete is roughly smeared to ensure that the surface is basically flat and has no stones leaked outside and no concave-convex phenomenon on the outer surface, and the surface of the later-stage laminated slab needs to be flat because the concrete needs to be poured above the bottom plate of the later-stage laminated slab. When the concrete reaches the initial setting state, the surface of the concrete is roughened, and the main purpose of roughening is to form a whole with the subsequent pouring of the floor slab.
Then, the concrete is cured, after the concrete reaches a certain strength, the strength is basically formed, then, a hanging rod is arranged above a hanging ring of the steel reinforcement framework, the hanging rod is arranged along the long side direction of the concrete, a connecting bolt is arranged on the hanging rod, the connecting bolt is hooked on the hanging ring, a connecting hanging block is arranged between the concrete and the hanging rod, the connecting hanging block enables the connecting bolt to keep a tensioning state, in the embodiment, the hanging rod is made of square steel, connecting holes are arranged on the hanging rod at intervals, the interval distance between the connecting holes is about 1m, the connecting holes are through holes, the connecting holes penetrate through the hanging rod from top to bottom, in order to pull the laminated slab bottom plate, the connecting bolt is arranged in the connecting holes and penetrates through the connecting holes, the connecting bolt comprises a pulling hook part for connecting the bolt on the hanging ring and a bolt part arranged above the pulling hook part, in the embodiment, in order to facilitate the implementation of the connecting bolt, the aperture of the connecting hole is larger than the width of the connecting bolt so as to facilitate the taking and placing of the connecting bolt, a nut is sleeved at one end of the threaded part, which extends out of the connecting hole, and the connecting bolt is fixed on the hanging rod through the nut. Therefore, the multi-point tension of the laminated slab bottom plate is formed through the lifting hooks of the connecting bolts, and the problem that the laminated slab bottom plate is warped due to the prestress of the whole laminated slab bottom plate caused by the broken prestressed reinforcement is solved.
Meanwhile, the arrangement of the hanger rod also avoids the problem of local fracture caused by uneven stress in the lifting process of the laminated slab bottom plate. It should be noted that, through the arrangement of the hanger rod, when the laminated slab bottom plate is manufactured, the traditional steel bar truss can be eliminated, the production cost of the whole laminated slab bottom plate is reduced, and the production speed is improved. In addition, in the whole laminated slab bottom plate production process, only two hanging rods need to be arranged at intervals.
In order to guarantee the tensioning between jib and the superimposed sheet bottom plate, ensure the take-up of connecting bolt, in order to provide corresponding pulling force, solve the problem that the superimposed sheet bottom plate face warpage that prestressing force broken string made whole superimposed sheet bottom plate's prestressing force leads to, in order to guarantee the stability of superimposed sheet bottom plate, still be provided with the connection piece of hanging between jib and superimposed sheet bottom plate, be provided with the hole for hoist on connecting the piece of hanging, the hole for hoist runs through the connection and hangs the piece setting, rings and connecting bolt stretch into the downthehole setting of hoist. The connecting hanging blocks can bear the pressure and the bending moment from the bottom plate of the laminated slab, and it should be noted that the two connecting hanging blocks arranged at the outermost sides need to be arranged close to the two ends of the bottom plate of the laminated slab, so that the shearing force applied to the bottom plate of the laminated slab can be reduced, and the stability of the bottom plate of the laminated slab during hoisting and placing can be ensured.
Meanwhile, in the hoisting process, due to the arrangement of the connecting hoisting block, the bottom plate of the laminated slab is very easy to be tensioned, and the problem of board surface warping generated when the prestressed reinforcement is released is further avoided. Of course, the connecting hanging block can also be in a split type structural design and consists of two fixing blocks with the same height, and the main purpose of the connecting hanging block is to improve the tension of the connecting bolt. In addition, the arrangement of the connecting hanging block is also beneficial to realizing the support and the reinforcement of the whole laminated plate bottom plate. The material of connecting the hanging piece can be concrete, also can be other materials, for example wooden block etc. in this embodiment, the material of connecting the hanging piece is concrete.
And (3) after the strength of the concrete reaches 70% -75% of the standard maintenance strength, shearing the prestressed reinforcement, enabling the concrete to generate pre-stress by means of the bonding of the concrete and the prestressed reinforcement, then separating the concrete from the mould by using the detachable mould, and obtaining the laminated slab bottom plate after the strength of the concrete reaches a certain strength (generally not less than 20 Mpa). And then hoisting, transporting and stacking.
Through the setting of hoist (jib, connecting bolt and connection hanger piece), make the stability of superimposed sheet bottom plate obtain keeping, in the hoist and mount process, only need to hoist two points of jib can, need not to increase the use of iron shoulder pole, the hoist and mount node of jib can transmit pulling force, pressure, moment of flexure and shear force to solve the fracture problem that superimposed sheet bottom plate hoist and mount in-process exists.
Simultaneously, when the hoist and mount of traditional superimposed sheet were stacked, six layers could only be stacked to the highest, and through the setting of whole hoist structure, can satisfy stack more than 7 layers at least, and then reduced the occupation of land problem of placing of superimposed sheet bottom plate and in the transportation, the problem that the freight volume is few. Because the protruding problem of connecting bolt, can increase horizontal cushion between two jibs, improve the height, avoid connecting bolt and the bottom surface contact of superimposed sheet bottom plate can.
Through foretell setting, through supporting for the framework of steel reinforcement pulling force, the effectual warped problem of face that leads to when having solved prestressing steel broken string, and can replace steel bar truss to reduce the cost raise the efficiency, increase the number of piles in factory's manufacturing transportation and the field usage and reduce the support quantity and realize supporting in advance both ends to can used repeatedly, implement the guarantee for the production of superimposed sheet bottom plate.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (6)
1. A production process of a prestressed concrete laminated slab bottom plate is characterized by comprising the following effective steps:
a. firstly, cleaning the surfaces of a die table and a die to ensure the cleanness of the surfaces of the die table and the die;
b. after the die table and the die are cleaned, spraying a release agent on the surface of the die table and strickling the release agent by a strickler to ensure the uniformity and the thickness of the release agent;
c. tensioning the prestressed reinforcement by using a tensioning device, and weaving a reinforcement framework;
d. placing the cleaned mould at the designated position of the mould table, and placing a steel reinforcement framework in the mould;
e. placing a hydroelectric installation pre-embedded device in the mould;
f. casting concrete into the mould and vibrating to ensure that no air bubbles and honeycombs exist;
g. roughly smearing the surface of the concrete to ensure that the surface is basically flat and has no stones leaked outside and no concave-convex phenomenon on the outer surface;
h. when the concrete reaches an initial setting state, roughening the surface of the concrete;
i. curing the concrete, after the concrete reaches a certain strength, placing a connecting hanging block around a hanging ring of the steel reinforcement framework, wrapping the hanging ring in the connecting hanging block, placing a hanging rod above the connecting hanging block, arranging the hanging rod along the length direction of the concrete, arranging a connecting bolt on the hanging rod, and hooking the connecting bolt on the hanging ring to ensure the tensioning state between the connecting bolt and the hanging ring;
j. after the strength of the concrete reaches 70% -75% of the standard maintenance strength, shearing the prestressed reinforcement, and enabling the concrete to generate pre-stress by means of the bonding of the concrete and the prestressed reinforcement;
k. disassembling the mould to separate the concrete and the mould;
l, obtaining a laminated slab bottom plate after the strength of the concrete reaches a certain strength;
m, then hook two points of jib on the superimposed sheet bottom plate, carry out hoist and mount transportation, stack to the superimposed sheet bottom plate.
2. The production process of the prestressed concrete laminated slab bottom plate according to claim 1, wherein in the step h, connecting holes are formed in the hanger rod at intervals, the connecting holes penetrate through the hanger rod, connecting bolts are arranged in the connecting holes, the connecting bolts penetrate through the connecting holes, the connecting bolts comprise pull hook portions used for connecting bolts to be arranged on the hanging rings and bolt portions arranged above the pull hook portions, nuts are sleeved at one ends of the threaded portions extending out of the connecting holes, and the connecting bolts are fixed to the hanger rod through the nuts.
3. The production process of the prestressed concrete laminated slab bottom plate according to claim 1, wherein in the step h, the connecting hanging block is provided with a hanging hole, the hanging hole penetrates through the connecting hanging block, and the hanging ring and the connecting bolt extend into the hanging hole.
4. The process for producing a prestressed concrete laminated slab floor according to claim 1, wherein in said h step, two hanger rods are provided on the concrete, and said hanger rods are provided along the longitudinal direction of the concrete.
5. The production process of the prestressed concrete laminated slab floor according to claim 1, wherein in the step h, the connecting hanging blocks are made of concrete.
6. The process for producing a floor for a prestressed concrete composite slab as claimed in claim 1, wherein in said m steps, the composite slab floor is stacked in at least 7 layers.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113580358A (en) * | 2021-08-24 | 2021-11-02 | 德州海天机电科技有限公司 | A circulation production line for producing hollow floor of prestressing force |
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| CN111456318A (en) * | 2020-04-10 | 2020-07-28 | 悉地国际设计顾问（深圳）有限公司 | Prefabricated slab, manufacturing method of prefabricated slab, stacking method of prefabricated slab and construction method of prefabricated slab |
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| CN113580358A (en) * | 2021-08-24 | 2021-11-02 | 德州海天机电科技有限公司 | A circulation production line for producing hollow floor of prestressing force |
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