CN114960345B - Curbstone back concrete casting device - Google Patents
Curbstone back concrete casting device Download PDFInfo
- Publication number
- CN114960345B CN114960345B CN202210671636.3A CN202210671636A CN114960345B CN 114960345 B CN114960345 B CN 114960345B CN 202210671636 A CN202210671636 A CN 202210671636A CN 114960345 B CN114960345 B CN 114960345B
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- CN
- China
- Prior art keywords
- concrete
- slip
- pouring
- templates
- kerbstone
- 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.)
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Links
- 238000005266 casting Methods 0.000 title claims abstract description 34
- 238000010276 construction Methods 0.000 abstract description 4
- 239000011324 bead Substances 0.000 abstract 1
- 210000001503 joint Anatomy 0.000 abstract 1
- 239000004575 stone Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/12—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials
- E01C19/18—Devices for distributing road-metals mixed with binders, e.g. cement, bitumen, without consolidating or ironing effect
- E01C19/182—Devices for distributing road-metals mixed with binders, e.g. cement, bitumen, without consolidating or ironing effect solely for depositing
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/50—Removable forms or shutterings for road-building purposes; Devices or arrangements for forming individual paving elements, e.g. kerbs, in situ
- E01C19/502—Removable forms or shutterings, e.g. side forms; Removable supporting or anchoring means therefor, e.g. stakes
- E01C19/506—Removable forms or shutterings, e.g. side forms; Removable supporting or anchoring means therefor, e.g. stakes for kerbs, gutters or similar structures, e.g. raised portions, median barriers
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
A curbstone backrest concrete pouring device relates to the field of pavement construction. This kerbstone back concrete casting device includes the pouring truck that can follow the parting bead and remove, locate the hopper on the pouring truck, two liftable slip templates and with slip template one-to-one's support and lever clamp plate, two supports are connected respectively in the pouring truck and can follow the width direction of pouring truck and remove, the one end of lever clamp plate is articulated with corresponding support, the lever clamp plate passes the pushing down spring of corresponding support through at least one slip and is connected with corresponding slip template, the lever clamp plate can rotate along vertical plane and drive corresponding slip template and go up and down, leg joint has the locking subassembly that is used for locking to push down the spring, two slip templates enclose with the adjacent one side of two kerbstone and ground respectively and form both ends open-ended pouring cavity, the bottom of hopper and two slip templates communicate through the concrete pipe respectively. The curbstone backrest concrete pouring device can be used for rapidly and efficiently pouring curbstone backrest concrete.
Description
Technical Field
The application relates to the field of pavement construction, in particular to a concrete pouring device for a kerbstone backrest.
Background
In the road construction process, curbstones are required to be installed on two sides of a road, and backrest concrete is required to be poured on the outer sides of the curbstones, and particularly, the pouring amount of the backrest concrete in the road with the middle belt and the side belts is large. The existing backrest concrete pouring method comprises the steps of pouring a beach of concrete every few meters along the direction of the curbstone by using a concrete tank truck, manually shoveling the concrete to the outer side of the curbstone, then wiping and pressing the concrete to form the concrete, or unloading the concrete in a bucket of an excavator by the tank truck, and transporting the concrete to the rear side of the curbstone by the excavator, or directly unloading the concrete at the rear side of the curbstone along the direction of the curbstone by the concrete tank truck, wherein the problems of large labor amount, low construction efficiency, road surface pollution, curbstone and the like are unavoidable in any mode.
Disclosure of Invention
The application aims to provide a casting device for concrete of an curbstone backrest, which can rapidly and efficiently perform casting operation of the concrete of the curbstone backrest and effectively reduce the working strength of operators.
Embodiments of the present application are implemented as follows:
the embodiment of the application provides a concrete pouring device for a kerbstone backrest, which comprises a pouring truck capable of moving along a separation belt between two kerbstones, a hopper arranged on the pouring truck, two liftable sliding templates, a support and a lever pressing plate, wherein the support and the lever pressing plate are in one-to-one correspondence with the sliding templates, the two supports are respectively connected with the pouring truck and are configured to move along the width direction of the pouring truck, one end of the lever pressing plate is hinged with the corresponding support, the bottom of the lever pressing plate is connected with the top of the corresponding sliding template through at least one pressing spring which slides through the corresponding support, the lever pressing plate is configured to rotate along a vertical plane and drives the corresponding sliding templates to lift through the pressing spring, the support is connected with a locking assembly for locking or unlocking the corresponding pressing spring, one side, adjacent to the two kerbstone side, adjacent to the two sliding templates, and the ground enclose to form a pouring cavity with two ends open, and the bottom of the hopper and the two sliding templates are respectively communicated through a concrete conduit.
In some alternative embodiments, a screw pump is provided within the hopper for delivering concrete to the concrete conduit.
In some alternative embodiments, a vibrator is attached to the sliding template.
In some alternative embodiments, the locking assembly includes a latch that is axially movable to insert or remove the bracket and corresponding hold down spring.
In some alternative embodiments, a counterweight is connected to the end of the lever platen remote from the corresponding bracket.
In some alternative embodiments, at least one retractable gas spring support rod is connected between the two sliding templates.
In some alternative embodiments, at least two fixing holes extending along the width direction of the casting vehicle are respectively arranged on two sides of the casting vehicle, each fixing hole is connected with a connecting bolt sliding through the fixing hole, and the bracket is connected with each connecting bolt positioned on one side of the casting vehicle.
In some alternative embodiments, traction steel wire ropes are connected between two sides of the pouring truck and the two sliding templates respectively.
The beneficial effects of the application are as follows: the application provides a kerbstone backrest concrete pouring device which comprises a pouring truck capable of moving along a separation belt between two kerbstones, a hopper arranged on the pouring truck, two liftable sliding templates, supports and lever pressing plates, wherein the supports and the lever pressing plates are in one-to-one correspondence with the sliding templates, the two supports are respectively connected with the pouring truck and are configured to move along the width direction of the pouring truck, one end of each lever pressing plate is hinged with the corresponding support, the bottom of each lever pressing plate is connected with the top of the corresponding sliding template through at least one pressing spring which slides through the corresponding support, the lever pressing plates are configured to rotate along a vertical plane and drive the corresponding sliding templates to lift through the pressing springs, the supports are connected with locking assemblies for locking or unlocking the corresponding pressing springs, the two sliding templates are respectively enclosed with one side adjacent to the two kerbstones and the ground to form pouring cavities with openings at two ends, and the bottom of the hopper and the two sliding templates are respectively communicated through concrete guide pipes. The casting device for the side stone backrest concrete can rapidly and efficiently perform casting operation of the side stone backrest concrete, and effectively reduce working strength of operators.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural view of a concrete casting device for a kerbstone backrest in an embodiment of the present application;
Fig. 2 is a schematic view of a first partial structure of a concrete pouring device for a kerbstone backrest in accordance with an embodiment of the present application;
Fig. 3 is a schematic view of a second partial structure of a concrete pouring device for a kerbstone backrest in accordance with an embodiment of the present application.
In the figure: 100. pouring truck; 110. a hopper; 120. sliding the template; 130. a bracket; 140. a lever pressing plate; 150. traction wire rope; 160. pressing down the spring; 170. a casting cavity; 180. a concrete conduit; 190. a screw pump; 200. a vibrator; 210. a plug pin; 220. balancing weight; 230. a gas spring support rod; 240. a fixing hole; 250. a connecting bolt; 300. curbstone; 310. a dividing strip.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the product of the application, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The features and properties of the kerbstone back-rest concrete casting apparatus of the present application are described in further detail below with reference to examples.
As shown in fig. 1,2 and 3, an embodiment of the present application provides a concrete pouring device with a kerbstone backrest, which comprises a pouring truck 100, a hopper 110 arranged on the pouring truck 100, two liftable sliding templates 120, triangular supports 130 corresponding to the sliding templates 120 one by one, and lever pressing plates 140 corresponding to the supports 130 one by one, wherein the cross section of the sliding templates 120 is L-shaped, the two supports 130 are respectively connected to the pouring truck 100 and configured to move along the width direction of the pouring truck 100, two fixing holes 240 extending along the width direction of the pouring truck 100 are respectively arranged on two sides of the pouring truck 100, each fixing hole 240 is connected with a connecting bolt 250 sliding through the fixing hole, and the bottom edge of each support 130 is connected with two connecting bolts 250 positioned on one side of the pouring truck 100 through corresponding nuts.
The lever pressing plate 140 is located above the corresponding support 130, one end of the lever pressing plate is hinged to the top angle of the corresponding support 130, the other end of the lever pressing plate 140 is connected with the balancing weight 220, the sliding template 120 is located below the corresponding support 130, the top of the sliding template is connected with the bottom of the corresponding lever pressing plate 140 through two pressing springs 160 which slide through the corresponding support 130, the corresponding sliding template 120 is driven to lift through the pressing springs 160 when the lever pressing plate 140 rotates along a vertical plane, each support 130 is connected with a locking assembly for locking or unlocking the corresponding pressing springs 160, and the locking assembly comprises a bolt 210 capable of axially moving to insert or release the support 130 and the corresponding pressing springs 160. Two telescopic gas spring support rods 230 are connected between the two sliding templates 120, and traction steel wire ropes 150 are connected between two sides of the casting vehicle 100 and the two sliding templates 120 respectively. The bottom of the hopper 110 and the two sliding formworks 120 are respectively communicated through the concrete guide pipes 180, and screw pumps 190 for conveying concrete to the two concrete guide pipes 180 are respectively provided in the hopper 110. When the casting vehicle 100 moves along the separation belt 310 between the two curbs 300, the two sliding templates 120 are respectively enclosed with one side adjacent to the two curbs 300 and the ground to form a casting cavity 170 with two open ends; a vibrator 200 is connected to an outer wall of each sliding formwork 120.
When the casting device for the side stone backrest concrete provided by the embodiment of the application is used, the casting vehicle 100 is moved into the partition belt 310 between the two side stones 300, then the positions of the four connecting bolts 250 are moved along the four fixing holes 240 of the casting vehicle 100, the two supports 130 connected by the four connecting bolts 250 are respectively moved to the positions right above the backrest concrete to be cast of the two side stones 300, then the two supports 130 are fixed on the casting vehicle 100 by using the four connecting bolts 250 and corresponding nuts, then the bolts 210 connected by the two supports 130 are pulled out, the position of the pressing spring 160 is stopped by stopping using the bolts 210, at the moment, the two lever pressing plates 140 are rotated along a vertical plane by the gravity of the balancing weights 220 connected by the end parts, the two sliding templates 120 connected by the pressing springs 160 are lowered to the preset positions on the sides of the two side stones 300, the bolts 210 are then reinserted into the two brackets 130 and the corresponding pressing springs 160, the positions of the pressing springs 160 are locked by the bolts 210 to fix the heights of the pressing springs 160 and the sliding templates 120, the lengths of the two gas spring supporting rods 230 are then adjusted to adjust the distance between the two sliding templates 120, so that the two sliding templates 120 are respectively attached to the adjacent sides of the two curbs 300, the two sliding templates 120 are respectively enclosed with the adjacent sides of the two curbs 300 and the ground to form casting cavities 170 with two open ends, at the moment, a concrete tank truck can be driven to a position parallel to the casting truck 100, an elongated chute is mounted on the concrete tank truck to directly discharge concrete into the hopper 110 on the casting truck 100, the screw pump 190 is started to respectively introduce the concrete in the hopper 110 into the two casting cavities 170 through the two concrete guide pipes 180 to cast, and the vibrator 200 connected with the sliding template 120 is utilized to perform vibrating compaction on concrete, the pouring truck 100 is controlled to move along the length direction of the division strip 310, so that two pouring cavities 170 move along the length direction of the division strip 310 to perform continuous back concrete pouring operation on the side surfaces of two curbs 300, after the pouring operation of one division strip 310 is completed, the screw pump 190 and the vibrator 200 are closed, the position of the bolt 210 for locking the pressing spring 160 is stopped by pulling out the bolt 210, the lever pressing plate 140 is lifted, the two sliding templates 120 are driven to move upwards to be above the top surface of the curbs 300 by using the pressing spring 160 connected with the bottom of the lever pressing plate 140, the sliding templates 120 are prevented from descending by reinserting the position of the bolt 210 for locking the pressing spring 160, and the pouring truck 100 is driven to the next division strip 310 to repeat the steps above, so that the pouring of the curbs back concrete of the division strip 310 can be completed.
Wherein, be connected with traction wire rope 150 between the both sides of pouring truck 100 and two slip templates 120 respectively, can utilize traction wire rope 150 elasticity to inject the position of two slip templates 120, avoid pouring truck 100 slight off-set to drive slip templates 120 extrusion and collision kerbstone 300, avoid causing kerbstone 300 off-set to influence the going on of pouring operation.
The embodiments described above are some, but not all embodiments of the application. The detailed description of the embodiments of the application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Claims (7)
1. The utility model provides a curbstone back concrete casting device, its characterized in that includes can follow the pouring truck that the median removes between two curbstones, locates hopper, two liftable slip templates and with support and the lever clamp plate of slip template one-to-one, two the support connect respectively in the pouring truck and be configured to follow the width direction removal of pouring truck, the one end of lever clamp plate with correspond the support articulates, the bottom of lever clamp plate passes through at least one and corresponds the spring that pushes down of support is connected with corresponding slip template top, the lever clamp plate is configured to can rotate along vertical plane and pass through push down the spring drives corresponds the slip template goes up and down, the support connection has the locking subassembly that is used for locking or unblock corresponds push down the spring, two the slip templates respectively with two one side and the ground that the curbstone is adjacent encloses and form both ends open-ended chamber, the bottom of hopper and two the slip template are respectively through the concrete pipe intercommunication, two slip templates are connected with at least one scalable air supporting pole between the slip template.
2. The kerbstone back concrete casting apparatus as in claim 1, wherein screw pumps are disposed within the hopper for delivering concrete to the concrete conduit.
3. The kerbstone back-concrete casting apparatus as in claim 1, wherein the sliding form is connected with a vibrator.
4. The kerbstone back-concrete casting apparatus as in claim 1, wherein the locking assembly includes a latch axially movable into and out of the bracket and corresponding to the hold down spring.
5. The kerbstone backrest concrete casting apparatus as in claim 1, wherein the end of the lever platen remote from the corresponding bracket is connected with a counterweight.
6. The kerbstone backrest concrete casting apparatus as in claim 1, wherein the casting carriage has at least two fixing holes extending in a width direction thereof, each of the fixing holes being connected with a connecting bolt sliding therethrough, and the bracket is connected with each of the connecting bolts located at one side of the casting carriage.
7. The kerbstone backrest concrete casting apparatus as in claim 1, wherein traction wire ropes are connected between two sides of the casting vehicle and the two sliding templates, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210671636.3A CN114960345B (en) | 2022-06-14 | 2022-06-14 | Curbstone back concrete casting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210671636.3A CN114960345B (en) | 2022-06-14 | 2022-06-14 | Curbstone back concrete casting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114960345A CN114960345A (en) | 2022-08-30 |
| CN114960345B true CN114960345B (en) | 2024-05-17 |
Family
ID=82964141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210671636.3A Active CN114960345B (en) | 2022-06-14 | 2022-06-14 | Curbstone back concrete casting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114960345B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| ES1064261U (en) * | 2006-12-04 | 2007-02-16 | Sacyr, S.A.U. | Device for making concrete gutters by slipform. (Machine-translation by Google Translate, not legally binding) |
| US7182309B1 (en) * | 2004-08-26 | 2007-02-27 | Olsen Bret R | Concrete curbing forming device |
| KR100758356B1 (en) * | 2006-09-27 | 2007-09-14 | 전형식 | Boundary stone establishing structure and method |
| FR3043417A1 (en) * | 2015-11-10 | 2017-05-12 | Chapsol | PREFABRICATED FRAME ELEMENT AND METHOD FOR MANUFACTURING SUCH FRAMEWORK |
| CN109930455A (en) * | 2019-04-30 | 2019-06-25 | 山西建设投资集团有限公司 | A kind of town road kerbstone mounting structure and constructing device and construction method |
| EP3597385A1 (en) * | 2018-07-20 | 2020-01-22 | Kvm Industrimaskiner A/S | Mould for concrete blocks with (large) level differences, such as kerbstones/blocks/lock stones with or without cavities/drain |
| CN211645845U (en) * | 2018-12-10 | 2020-10-09 | 杭州江润科技有限公司 | Dew stone concrete pavement pours template system |
| CN113737613A (en) * | 2021-09-22 | 2021-12-03 | 江苏城东建设工程有限公司 | Efficient construction method for plain concrete behind road dental stone |
| CN215594963U (en) * | 2021-04-21 | 2022-01-21 | 中国建筑一局(集团)有限公司 | Device is pour to back ash concrete around curb |
| CN114214898A (en) * | 2021-12-31 | 2022-03-22 | 郑州第二市政建设集团有限公司 | Concrete pouring equipment for back of road kerbstone |
| CN216156309U (en) * | 2021-08-17 | 2022-04-01 | 中建八局第一建设有限公司 | Curb back construction equipment |
| CN114294015A (en) * | 2021-12-28 | 2022-04-08 | 中铁二十二局集团第四工程有限公司 | Intelligent positioning template hydraulic trolley for loess tunnel VI-level surrounding rock double-layer lining construction |
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2022
- 2022-06-14 CN CN202210671636.3A patent/CN114960345B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7182309B1 (en) * | 2004-08-26 | 2007-02-27 | Olsen Bret R | Concrete curbing forming device |
| KR100758356B1 (en) * | 2006-09-27 | 2007-09-14 | 전형식 | Boundary stone establishing structure and method |
| ES1064261U (en) * | 2006-12-04 | 2007-02-16 | Sacyr, S.A.U. | Device for making concrete gutters by slipform. (Machine-translation by Google Translate, not legally binding) |
| FR3043417A1 (en) * | 2015-11-10 | 2017-05-12 | Chapsol | PREFABRICATED FRAME ELEMENT AND METHOD FOR MANUFACTURING SUCH FRAMEWORK |
| EP3597385A1 (en) * | 2018-07-20 | 2020-01-22 | Kvm Industrimaskiner A/S | Mould for concrete blocks with (large) level differences, such as kerbstones/blocks/lock stones with or without cavities/drain |
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| CN215594963U (en) * | 2021-04-21 | 2022-01-21 | 中国建筑一局(集团)有限公司 | Device is pour to back ash concrete around curb |
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| CN114960345A (en) | 2022-08-30 |
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