CN213709224U - Bridge of turning with waterproof ball pivot system - Google Patents
Bridge of turning with waterproof ball pivot system Download PDFInfo
- Publication number
- CN213709224U CN213709224U CN202020906859.XU CN202020906859U CN213709224U CN 213709224 U CN213709224 U CN 213709224U CN 202020906859 U CN202020906859 U CN 202020906859U CN 213709224 U CN213709224 U CN 213709224U
- Authority
- CN
- China
- Prior art keywords
- spherical hinge
- concrete
- waterproof
- concrete layer
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a swivel bridge with waterproof spherical hinge system, which comprises a lower bearing platform, wherein a second anti-seepage concrete layer is poured on the lower bearing platform, a lower spherical hinge is arranged on the second anti-seepage concrete layer, an upper spherical hinge matched with the second anti-seepage concrete layer is arranged on the lower spherical hinge, a spherical hinge pair is arranged between the upper spherical hinge and the lower spherical hinge, and the spherical hinge pair is arranged on the lower spherical hinge; a first anti-seepage concrete layer is poured on the upper spherical hinge, pier bodies are poured on the first anti-seepage concrete layer, and waterproof bonding layers are arranged between the lower spherical hinge and the second anti-seepage concrete layer and between the upper spherical hinge and the first anti-seepage concrete layer. The utility model provides a bridge of turning guarantees through impervious concrete layer and waterproof bonding layer that the ball pivot of turning does not receive the normal work of moisture invasion.
Description
Technical Field
The utility model relates to a bridge technical field that turns specifically is a bridge of turning with waterproof ball pivot system.
Background
High-speed rail construction is more and more in China, railway lines are more and more crossed, however, on the premise that safe operation of existing lines is guaranteed, construction of new lines needs to be continuously carried out, and when new technologies of various bridge construction appear, new revolution of the bridge construction industry is often promoted, so that the swivel bridges are in operation. The bridge turning construction technology is a new bridge construction mode created by bridge construction landform and address, namely a mode of dividing a bridge into a left half-span structure and a right half-span structure and then closing the bridge by turning. In the swivel system, through a swivel construction process, in a spherical hinge structure of a swivel bridge, in order to ensure the complete rust prevention of a steel spherical hinge during the safe and smooth rotation process, moisture in the spherical hinge structure may flow into free water from migration water in concrete or from a gap between the spherical hinges.
Therefore, an implementation method capable of reducing water seepage and corrosion of the spherical hinge is needed, and the swivel spherical hinge is ensured to work normally without being disturbed by water intrusion.
Disclosure of Invention
To the problem, the utility model provides a bridge of turning with waterproof ball pivot system, advantages such as with low costs, price/performance ratio height can effectively reduce the infiltration and the corruption of ball pivot.
The purpose of the utility model is realized through the following technical scheme:
a swivel bridge with a waterproof spherical hinge system comprises a lower bearing platform 7, wherein a second anti-seepage concrete layer 6 is poured on the lower bearing platform 7, a lower spherical hinge 4 is arranged on the second anti-seepage concrete layer 6, an upper spherical hinge 3 matched with the lower spherical hinge 4 is arranged on the lower spherical hinge 4, a spherical hinge pair 5 is arranged between the upper spherical hinge 3 and the lower spherical hinge 4, and the spherical hinge pair 5 is installed on the lower spherical hinge 4; the waterproof concrete waterproof structure is characterized in that a first anti-seepage concrete layer 1 is poured on the upper spherical hinge 3, a pier body 8 is poured on the first anti-seepage concrete layer 1, and waterproof bonding layers 2 are arranged between the lower spherical hinge 4 and the second anti-seepage concrete layer 6 and between the upper spherical hinge 3 and the first anti-seepage concrete layer 1.
As a more excellent technical proposal of the utility model, the material of the waterproof bonding layer 2 is polyurethane or SBS modified asphalt.
As the more excellent technical scheme of the utility model, waterproof bonding layer 2's material be polyurethane, polyurethane coating at the upper surface of last ball pivot 3 and the lower surface of lower ball pivot 4, the quantity is 0.95kg/m2。
The utility model discloses a bridge's of turning work progress with waterproof ball pivot system as follows:
preparing sufficient cement, stone, sand, water, an additive, polypropylene fiber, a cement-based permeable crystallization master batch and other materials according to the mixing ratio;
secondly, the materials are put into a concrete mixer according to a specified sequence for mixing, and water is added at last during mixing, so that the polypropylene fiber and the cement-based permeable crystallization master batch can be dispersed in the concrete more uniformly;
and step three, when pouring impervious concrete layers of the lower bearing platform and the pier at the upper part of the spherical hinge, binding reinforcing steel bars at specified positions, installing a template, reserving vibrating holes for binding the reinforcing steel bars, and cleaning sundries in the mould or on a cushion layer when installing the mould to ensure the cleanness of the template. The uniformity and the compactness of the impervious concrete are ensured during pouring, the concrete is continuously poured in layers at one time, and the waterproof concrete is vibrated and compacted by using a vibrating rod;
and fourthly, removing the template after the impervious concrete reaches the specified strength after being cured for 7 days.
Lower ball pivot scribble waterproof material's on with the steel-concrete interface of concrete step as follows:
firstly, cleaning the surface of a spherical hinge by using a brush to keep the spherical hinge and an impervious concrete reinforced concrete interface clean;
wiping off redundant moisture at the coating position of the spherical hinge to ensure the drying of the spherical hinge and the impervious concrete reinforced concrete interface;
and step three, coating polyurethane which is dipped by a coating brush and is coated on the steel ball hinge surface at the joint of the concrete, wherein the coating is carried out for three times, and the coating amount is 1/3 of the total amount each time, so that the waterproof coating is uniformly coated.
The utility model discloses be used for polyurethane waterproof material ball pivot and concrete steel to mix when the interface is waterproof, when paining fast, accomplish as far as possible in 1 ~ 2 hours and paint, avoid polyurethane's solidification to exert an influence with the concrete bonding. The polyurethane should be continuously and uninterruptedly coated on the connecting part of the steel ball hinge and the waterproof concrete, bubbles generated in the coating process are removed, and the waterproof concrete is ensured to be prevented from being in direct contact with the steel ball hinge. After the polyurethane is coated, reinforcing steel bars are bound and templates are installed as soon as possible, and the waterproof coating is prevented from being cured before concrete pouring to influence the bonding strength of the concrete and the waterproof coating.
Has the advantages that
The utility model provides a bridge of turning passes through the waterproof mode that combines together of additive waterproof and coating more comprehensive prevention and cure ball pivot system's water damage. The utility model discloses utilize the synergism of polypropylene fiber and cement base infiltration crystallization masterbatch simultaneously, the concrete admixture and the reasonable addition that both constitute not only make the good closely knit degree that has of concrete, and impermeability also improves greatly, and mechanical properties index such as its cube compressive strength, splitting tensile strength and rupture strength has also obtained showing the improvement. The utility model discloses a polyurethane is as waterproof bonding layer material, and its shear strength is high, and environmental factor such as temperature, humidity and freeze thawing is less to its waterproof bonding performance's influence.
Drawings
Fig. 1 is a schematic structural view of a swivel bridge with a waterproof spherical hinge system according to the present invention;
wherein: 1 is a first impervious concrete layer, 2 is a waterproof bonding layer, 3 is an upper spherical hinge, 5 is a spherical hinge pair, 4 is a lower spherical hinge, 6 is a second impervious concrete layer, 7 is a lower bearing platform, and 8 is a pier body.
Detailed Description
In order to make the technical method of the present invention clearer and more clear, the present invention will be described in further detail with reference to the accompanying drawings and laboratory examples, but those skilled in the art will understand that the following examples are only for illustrating the present invention, and should not be construed as limiting the scope of the present invention.
As shown in fig. 1, the utility model provides a including lower cushion cap 7, its characterized in that: a second anti-seepage concrete layer 6 is poured on the lower bearing platform 7, a lower spherical hinge 4 is arranged on the second anti-seepage concrete layer 6, an upper spherical hinge 3 matched with the lower spherical hinge 4 is arranged on the lower spherical hinge 4, a spherical hinge pair 5 is arranged between the upper spherical hinge 3 and the lower spherical hinge 4, and the spherical hinge pair 5 is installed on the lower spherical hinge 4; the waterproof concrete waterproof structure is characterized in that a first anti-seepage concrete layer 1 is poured on the upper spherical hinge 3, a pier body 8 is poured on the first anti-seepage concrete layer 1, and waterproof bonding layers 2 are arranged between the lower spherical hinge 4 and the second anti-seepage concrete layer 6 and between the upper spherical hinge 3 and the first anti-seepage concrete layer 1.
The cement is P.O42.5R ordinary portland cement; the water is common tap water; the sand is medium sand with fineness modulus of 2.95; the stones are coarse aggregates with 5-20 continuous grades; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent; the active powder is F class first-grade fly ash; the source of the cement-based permeable crystallization master batch is the West Andemet waterproof material company Limited, and the model is DMC-S-WS-710B.
The utility model discloses a bridge's of turning construction steps with waterproof ball pivot system as follows:
designing and adjusting the mix proportion of impervious concrete according to the requirements of 'design specification of mix proportion of common concrete' JGJ55-2011, and preparing sufficient cement, stone, sand, water, additives, polypropylene fibers, cement-based permeable crystallization master batch and other materials according to the mix proportion;
and step two, putting the materials into a concrete mixer according to a specified sequence for stirring. During the stirring, the water is added at the end, so that the polypropylene fiber and the cement-based permeable crystallization master batch can be dispersed in the concrete more uniformly.
Example 1
The mixing ratio is cement: water: sand: 325 parts of stones: 156: 690: 1280, wherein the usage amount of the fly ash is 18 percent of the usage amount of the cement, the usage amount of the high-efficiency water reducing agent is 0.2 percent of the usage amount of the cement, and the usage amount of the cement-based permeable crystallization active master batch is 2 percent of the usage amount of the cement.
Example 2
The mixing ratio is cement: water: sand: 325 parts of stones: 156: 690: 1280 percent of fly ash, high-efficiency water reducing agent and polypropylene fiber, wherein the dosage of the fly ash is 18 percent of the dosage of the cement, the dosage of the high-efficiency water reducing agent is 0.2 percent of the dosage of the cement, and the dosage of the polypropylene fiber is 0.9kg/m3。
Example 3
The mixing ratio is cement: water: sand: 325 parts of stones: 156: 690: 1280 percent of fly ash, high-efficiency water reducing agent and polypropylene fiber, wherein the dosage of the fly ash is 18 percent of the dosage of the cement, the dosage of the high-efficiency water reducing agent is 0.2 percent of the dosage of the cement, and the dosage of the polypropylene fiber is 0.9kg/m3The cement-based permeable crystallization active master batch accounts for 2 percent of the cement consumption.
Comparative example 1
The mixing ratio is cement: water: sand: 325 parts of stones: 156: 690: 1280, wherein the usage amount of the fly ash is 18 percent of the usage amount of the cement, and the usage amount of the high-efficiency water reducing agent is 0.2 percent of the usage amount of the cement.
The concrete obtained in examples 1-3 and comparative example 1 was tested according to the test method standard for physical and mechanical properties of ordinary concrete GB/T50081-2019 and the test method standard for long-term properties and durability of ordinary concrete GB/T50082-2009, the age of the concrete was 28d, and the test results are shown in the following Table 1.
TABLE 1
Analysis of the results regarding cubic compressive strength:
in the embodiment 2, after the polypropylene fibers are doped into the concrete, the gaps among the concrete aggregates are filled, so that the interior of the concrete is more compact, and the cubic compressive strength of the concrete can be improved to a certain extent. However, the compressive strength and the tensile strength of the polypropylene fiber are low, so that the cubic compressive strength improvement effect of the polypropylene fiber on concrete is not particularly remarkable.
After the cement-based permeable crystallization active master batch in the embodiment 1 is doped into concrete, permeable crystallization can be performed through hydration reaction and capillary action, and the special active chemical substances in the master batch can play a role in catalysis and activation, so that the crystals are promoted to be rapidly generated in the concrete and gradually permeate into the whole concrete, and react with free ions in concrete mortar to generate water-insoluble crystalline substances. Meanwhile, the interface bonding force between concrete aggregates is enhanced, the internal microstructure of the concrete is improved, and the inside of the concrete is more compact, so that the cubic compressive strength of the concrete is improved.
The comparison of example 3 with examples 1 and 2 shows that the synergistic effect of the cement-based permeable crystalline master batch and the polypropylene fiber makes the cubic compressive strength more effective.
Analysis of results on tensile strength at cleavage:
after the polypropylene fiber mixes in the concrete in embodiment 2, can make the space between the concrete aggregate obtain filling, thereby make the inside of concrete more closely knit, original elastic modulus obtains changing, the continuity of concrete inner structure has effectively been improved, and polypropylene fiber itself has certain tensile strength, be equivalent to the inside tiny reinforcing bar of embedding concrete, evenly anchor dispersion inside the concrete, at the split cracked in-process that produces, can offset partly pulling force, thereby reduce the inside stress of concrete, prevent the production and the emergence of crackle.
After the cement-based permeable crystallization master batch in the embodiment 1 is doped into concrete, permeable crystallization is carried out through hydration reaction and capillary action, and special active chemical substances in the master batch can play a role in catalysis and activation to promote crystallization to be rapidly generated in the concrete and gradually permeate into the whole concrete, so that water-insoluble crystalline substances are generated through interaction with free ions in concrete mortar, the interface bonding force between concrete aggregates is enhanced, the microstructure structure in the concrete is improved, the interior of the concrete is more compact, and in the splitting process, a part of applied stress can be dissipated, so that the splitting tensile strength of the concrete is improved.
The comparison of example 3 with examples 1 and 2 shows that the composite incorporation of the cement-based infiltration crystallization masterbatch and the polypropylene fiber has synergistic effect to make the effect of splitting tensile strength more.
Analysis of the results with respect to flexural strength:
after the polypropylene fiber is doped into the concrete in the embodiment 2, the gaps among the concrete aggregates are filled, so that the concrete is more compact, the original elastic modulus is changed, the continuity of the internal structure of the concrete is effectively improved, the polypropylene fiber has certain tensile strength, and the stress generated by one part of bending resistance can be offset, so that the stress inside the concrete is reduced, the generation and occurrence time of cracks is prolonged, and the bending strength of the concrete is improved to a certain extent.
In example 1, after the cement-based permeable crystallization master batch is mixed into concrete, permeable crystallization is performed through hydration reaction and capillary action, and the special active chemical substances in the master batch play roles of catalysis and activation, so that the crystals are promoted to be rapidly generated in the concrete and gradually permeate into the whole concrete, and react with free ions in concrete mortar to generate water-insoluble crystalline substances. In addition, the interface bonding force among concrete aggregates is enhanced, the internal microstructure of the concrete is improved, the interior of the concrete is more compact, and therefore the cubic compressive strength of the concrete is improved.
The comparison of example 3 with examples 1 and 2 shows that the composite incorporation of the cement-based permeable crystalline master batch and the polypropylene fiber has synergistic effect to make the flexural strength more effective.
Analysis of results regarding impermeability:
the polypropylene fibers in example 2 can improve the impermeability of the concrete because the polypropylene fibers are uniformly dispersed in the concrete sample, and play a role in filling the gaps in the concrete, so that the concrete is more compact, the original high elastic modulus property of the concrete is changed, the brittleness is reduced, and the cracking and breaking process of the concrete matrix is inhibited. From the viewpoint of microstructure, the polypropylene fiber blocks or blocks capillary air holes in concrete, a water seepage channel in the concrete is blocked, the internal gap structure of the concrete is obviously improved, the hydrostatic pressure action in the capillary air holes is reduced, and the damage of the concrete is effectively inhibited through the functions of crack resistance effect and air entraining effect, so that the water seepage height of the concrete is reduced under the constant pressure condition, and the impermeability of the concrete is improved.
In example 1, after the cement-based permeable crystallization master batch is doped into concrete, permeable crystallization is performed through hydration reaction and capillary action, and the special active chemical substances in the master batch play roles of catalysis and activation, so that the crystals are promoted to be rapidly generated in the concrete and gradually permeate into the whole concrete, and react with free ions in concrete mortar to generate water-insoluble crystalline substances to fill gaps in the concrete. In addition, the interface bonding force among concrete aggregates is enhanced, the internal microstructure of the concrete is improved, the interior of the concrete is more compact, the internal gap is smaller, and the impermeability is improved.
The results of the comparison of example 3 with examples 1 and 2 show that the effect of impermeability is enhanced by the synergistic effect of the cement-based infiltrating crystalline masterbatch and the polypropylene fiber.
Example 4
The coating steps of the waterproof bonding layer material of the spherical hinge and concrete steel-concrete interface are as follows:
firstly, cleaning the surface of a spherical hinge by using a brush to keep the spherical hinge and an impervious concrete reinforced concrete interface clean;
wiping off redundant moisture at the coating position of the spherical hinge to ensure the drying of the spherical hinge and the impervious concrete reinforced concrete interface;
and step three, coating polyurethane which is dipped by a coating brush and is coated on the steel ball hinge surface at the joint of the concrete, wherein the coating is carried out for three times, and the coating amount is 1/3 of the total amount each time, so that the waterproof coating is uniformly coated.
In the laboratory, according to the coating step of the waterproof bonding material, the polyurethane is coated according to the proportion of 0.95kg/m2The dosage of the concrete is uniformly coated on the center 100mm x 100mm of the surface of the customized steel plate, then the concrete test piece with the size of 100mm x 100mm is subjected to roughening treatment on the opposite two surfaces, and then the concrete test piece is bonded with the steel plate through polyurethane.
Comparative example 2:
the difference from example 4 is that: the SBS modified asphalt is used according to the optimal dosage of 1.18kg/m2The dosage of the concrete is uniformly coated on the center 100mm x 100mm of the surface of the customized steel plate, then the concrete test piece with the size of 100mm x 100mm is subjected to roughening treatment on the opposite two surfaces, and then the concrete test piece is bonded with the steel plate through polyurethane.
The waterproof adhesive performance of example 4 and the comparative example under different temperature, humidity and freeze-thaw conditions was tested by a direct shear test, and the shear strength results are shown in table 2.
TABLE 2
From the comparison result between example 4 and comparative example 2, it is seen that the waterproof bonding effect of polyurethane is better, and the polyurethane is more suitable for waterproofing the spherical hinge and concrete-steel mixed interface.
In northeast regions, the temperature in winter is as low as-20 ℃, the volumes of concrete around the swivel bridge spherical hinge and the swivel bridge spherical hinge are large, and the difference between the thermal expansion coefficient and the contraction coefficient of the swivel bridge spherical hinge and the swivel bridge spherical hinge is large. Therefore, the waterproof adhesive material used between the spherical hinge surface and the concrete surface needs to be capable of coordinating the shear deformation between the spherical hinge surface and the concrete surface under the environment condition so as to prevent the spherical hinge surface and the concrete surface from deforming due to shear stress, and therefore, the contact surface is prevented from generating gaps so that moisture enters the spherical hinge surface and then permeates into a spherical hinge system.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The particular features, structures, materials, or characteristics described in this specification may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (3)
1. The utility model provides a bridge of turning with waterproof spherical hinge system, includes cushion cap (7) down, its characterized in that: a second anti-seepage concrete layer (6) is poured on the lower bearing platform (7), a lower spherical hinge (4) is arranged on the second anti-seepage concrete layer (6), an upper spherical hinge (3) matched with the lower spherical hinge (4) is arranged on the lower spherical hinge (4), a spherical hinge pair (5) is arranged between the upper spherical hinge (3) and the lower spherical hinge (4), and the spherical hinge pair (5) is arranged on the lower spherical hinge (4); the waterproof concrete is characterized in that a first anti-seepage concrete layer (1) is poured on the upper spherical hinge (3), a pier body (8) is poured on the first anti-seepage concrete layer (1), and waterproof bonding layers (2) are arranged between the lower spherical hinge (4) and the second anti-seepage concrete layer (6) and between the upper spherical hinge (3) and the first anti-seepage concrete layer (1).
2. The swivel bridge with a waterproof spherical hinge system according to claim 1, wherein: the waterproof bonding layer (2) is made of polyurethane or SBS modified asphalt.
3. The swivel bridge with a waterproof spherical hinge system according to claim 1, wherein: the waterproof bonding layer (2) is made of polyurethane, the polyurethane is coated on the upper surface of the upper spherical hinge and the lower surface of the lower spherical hinge, and the using amount of the polyurethane is 0.95kg/m2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020906859.XU CN213709224U (en) | 2020-05-26 | 2020-05-26 | Bridge of turning with waterproof ball pivot system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020906859.XU CN213709224U (en) | 2020-05-26 | 2020-05-26 | Bridge of turning with waterproof ball pivot system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213709224U true CN213709224U (en) | 2021-07-16 |
Family
ID=76765281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020906859.XU Expired - Fee Related CN213709224U (en) | 2020-05-26 | 2020-05-26 | Bridge of turning with waterproof ball pivot system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213709224U (en) |
-
2020
- 2020-05-26 CN CN202020906859.XU patent/CN213709224U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Guo et al. | Mechanical and interface bonding properties of epoxy resin reinforced Portland cement repairing mortar | |
| US5695811A (en) | Methods and compositions for bonding a cement-based overlay on a cement-based substrate | |
| CN110357545B (en) | Mortar for quickly repairing local damage of concrete base layer and preparation method thereof | |
| CN112679190B (en) | Reinforcing waterproof mortar for filling concrete bottom cavity | |
| Huynh et al. | The long-term creep and shrinkage behaviors of green concrete designed for bridge girder using a densified mixture design algorithm | |
| CN112408880A (en) | Basalt fiber water-permeable concrete and preparation method thereof | |
| Liu et al. | Effects of thermal-cooling cycling curing on the mechanical properties of EVA-modified concrete | |
| CN113816643B (en) | Concrete reinforcing agent for sponge city construction, preparation method thereof and pervious concrete | |
| CN110240454A (en) | A method of concrete road surface is repaired using protofibre cement based patching material | |
| Aghaee et al. | Benefits and drawbacks of using multiple shrinkage mitigating strategies on performance of fiber-reinforced mortar | |
| CN105819792B (en) | It is a kind of can the concrete of rapid shaping and the renovation technique at expansion joint | |
| CN111749131B (en) | Bridge of turning with waterproof ball pivot system | |
| CN112553994A (en) | Composite pavement road with asphalt layer coated on sisal fiber cement-based composite material | |
| CN213709224U (en) | Bridge of turning with waterproof ball pivot system | |
| Zhou et al. | Bond performance and mechanisms of sulphoaluminate cement-based UHPC for reinforcing old concrete substrate | |
| CN115180900B (en) | Ultrahigh-performance premixed pervious concrete and preparation method thereof | |
| CN104894975A (en) | Roughening method of concrete | |
| Hossain et al. | Investigation of the effect of nylon fiber in concrete rehabilitation | |
| CN107986742A (en) | A kind of water-permeable and water retention material and preparation method thereof | |
| RU2223931C1 (en) | Polystyrene/concrete products' manufacture process | |
| CN116514494B (en) | Permeable concrete and landscape pavement construction method | |
| CN116675494B (en) | Preparation and repair method of repair material with high interface bonding performance and low bone slurry ratio | |
| US20220289630A1 (en) | Lightweight structural concrete from recycled materials | |
| Wang et al. | Mechanical Properties of Precast Concrete Pipe (PCP) Sheet Under Different Curing Conditions and Ages | |
| CN109881548B (en) | Assembly type heavy-load traffic road pavement structure based on composite material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210716 |