CN114232562B - Construction method for changing and filling cement modified soil of expansive soil river slope - Google Patents
Construction method for changing and filling cement modified soil of expansive soil river slope Download PDFInfo
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- CN114232562B CN114232562B CN202111446575.2A CN202111446575A CN114232562B CN 114232562 B CN114232562 B CN 114232562B CN 202111446575 A CN202111446575 A CN 202111446575A CN 114232562 B CN114232562 B CN 114232562B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/121—Devices for applying linings on banks or the water bottom
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
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Abstract
The invention relates to the technical field of soil replacement and filling construction, in particular to a construction method for cement modified soil replacement and filling of an expansive soil river slope, which comprises the following steps: firstly, excavating soil materials; step two, sun-curing the soil material; step three, crushing the soil; step four, testing soil materials; fifthly, mixing modified soil; and step six, changing and filling the modified soil. By the construction process, the property and the structure of the expansive soil are improved by digging out the expansive soil of the river slope and adding cement and water into the expansive soil, so that the expansive soil is filled back after the expansive potential is lost, and the problem of instability of the river slope of the expansive soil is preferably solved.
Description
Technical Field
The invention relates to the technical field of soil replacement and filling construction, in particular to a construction method for cement modified soil replacement and filling of an expansive soil river slope.
Background
Cement modified soil is to mix cement in certain proportion into the expansive soil material to improve the property and structure of expansive soil, to make the expansive soil lose expansion potential and to raise soil strength and bearing capacity to some extent.
At present, the outstanding problem in canal engineering is the problem of stability of the expansive soil side slope. Because of the expansibility of the expansive soil, the excavated side slope is extremely easy to deform and destroy, and in the prior art, cement modified soil is generally adopted to replace and fill so as to solve the problem of unstable side slope. However, the modified soil replacement construction process in the prior art is complex, and has the problems of being unfavorable for field control operation and inconvenient construction.
Disclosure of Invention
Aiming at certain or some defects existing in the prior art, the invention provides a construction method for changing and filling cement modified soil of an expansive soil river slope.
In order to solve the technical problems, the invention is solved by the following technical scheme.
The construction method for changing and filling the cement modified soil of the expansive soil river slope comprises the following steps:
step one, excavating soil materials
Excavating and stacking soil materials of the side slope of the expansive soil river to be replaced and filled;
step two, sun-curing the soil material
Sun-drying the soil materials excavated and piled in the first step;
step three, crushing the soil material
Crushing the dried soil material in the second step to prepare crushed soil material with the particle size smaller than 10 cm;
fourth, soil test
The physical index parameters of the crushed soil materials in the third step are obtained through test;
step five, mixing the modified soil
Mixing the crushed soil material in the third step with cement and water according to the test result in the fourth step to prepare cement modified soil;
step six, changing and filling the modified soil
And C, filling the cement modified soil in the fifth step on the side slope of the expansive soil river excavated in the first step.
By the construction process, the property and the structure of the expansive soil are improved by digging out the expansive soil of the river slope and adding cement and water into the expansive soil, so that the expansive soil is filled back after the expansive potential is lost, and the problem of instability of the river slope of the expansive soil is preferably solved.
Preferably, the third step specifically includes the following steps:
s21, crushing the soil material by adopting a hydraulic soil crusher to prepare crushed soil material;
s22, piling the crushed soil materials prepared in the step S21;
s23, covering the crushed soil piles in the step S22 with plastic cloth through a covering device.
Through the construction steps in the invention, the excavated expansive soil is preferably crushed, so that the particle size of the expansive soil meets the requirement, and the subsequent stirring is convenient.
Preferably, in the fifth step, a stabilized soil mixer is used for mixing the modified soil.
Preferably, the sixth step specifically includes the steps of:
s41, loading by adopting a wheel loader and transporting modified soil to the side slope of the expansive soil river excavated in the step one by adopting a dump truck;
s42, tiling the modified soil in the step S41 by adopting a bulldozer;
and S43, rolling the modified soil paved in the step S42 by adopting bump vibration rolling.
Through the construction steps in the invention, the modified soil is preferably filled on the side slope of the excavated river channel, thereby solving the problem of instability of the side slope of the expansive soil river channel.
Preferably, the covering device comprises bottom plates which are arranged in parallel, the bottom plates are connected through telescopic connecting rods, and the lower end part of the bottom plate is provided with a movable wheel; the base plate is symmetrically provided with mounting plates, rotatable rotating plates are hinged between the mounting plates, and a clamping piece for clamping the plastic cloth is arranged at one end part of each rotating plate; a driving component for driving the rotating plate to rotate is arranged in the bottom plate.
Through the structure of the invention, the clamping piece clamps and fixes two corners of the plastic cloth, so that the rotation of the rotating plate can better drive the plastic cloth to cover the crushed soil pile, and the operation is simple and convenient.
Preferably, the upper side surface of the bottom plate is provided with a chute positioned between the mounting plates along the length direction of the bottom plate, and a rotatable screw rod is arranged in the chute; hinge holes are symmetrically arranged between the mounting plates; the driving assembly comprises a rack sliding in the chute, the screw threads of the screw rod penetrate through the rack, a gear matched with the rack is arranged at the other end of the rotating plate, and a hinge shaft extending into the corresponding hinge hole is arranged on the gear.
Through the structure in the invention, the screw rod can rotate to drive the rotating plate to rotate, so that the plastic cloth is covered on the crushed soil pile.
Preferably, the clamping piece comprises a pressing plate located at one end of the rotating plate, a side plate located at the side face of the rotating plate is arranged on the pressing plate, a first strip-shaped groove is formed in the side plate along the length direction of the rotating plate, a limiting sliding block located in the corresponding limiting sliding groove and sliding in the corresponding limiting sliding groove is arranged on the side face of the rotating plate, a first fixing column extending out of the first strip-shaped groove is arranged on the side face of the rotating plate, and a first nut used for fixing the side plate is arranged on the first fixing column in a threaded mode.
By the structure in the invention, the first nut is screwed to realize the disassembly and assembly of one corner of the plastic cloth at the end part of the rotating plate.
Preferably, a motor for driving the screw rod to rotate is arranged at the end part of the bottom plate, and the screw rod is preferably rotated.
Preferably, the rotating plate comprises a first connecting plate connected with the gear and a second connecting plate matched with the clamping piece, a second bar-shaped groove is formed in the side face of the first connecting plate along the length direction of the side face of the first connecting plate, two second fixing columns penetrating through the second bar-shaped groove are arranged on the side face of the second connecting plate, and second nuts used for fixing the first connecting plate and the second connecting plate are arranged on the second fixing columns in a threaded mode.
Through the structure in the invention, the length of the rotating plate can be adjusted by screwing the second nut, so that the covering device can adapt to crushed soil piles with different heights, and the applicability of the covering device is wider.
Preferably, the connecting rod comprises a long cylinder, and threaded rods with threads extending into the long cylinder are arranged at two ends of the long cylinder; the bottom plate is provided with a threaded hole for the corresponding threaded rod to pass through.
Through the structure in the invention, the connecting rod is preferably arranged on the bottom plate, and meanwhile, the length of the connecting rod is adjusted to be suitable for the bottom plate with different distances, so that the applicability of the covering device is wider.
Drawings
FIG. 1 is a process flow diagram of the construction method for cement-modified soil reclamation of the expansive soil river slope in example 1;
fig. 2 is a schematic structural view of a covering device in embodiment 2;
FIG. 3 is a schematic view of the base plate in example 2;
fig. 4 is a schematic view of a rotating plate in embodiment 2;
FIG. 5 is an enlarged schematic view of portion A of FIG. 4;
fig. 6 is a schematic view of a clamping member in embodiment 2.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples. It is to be understood that the examples are illustrative of the present invention and are not intended to be limiting.
Example 1
As shown in fig. 1, the embodiment provides a construction method for changing and filling cement modified soil of an expansive soil river slope, which comprises the following steps:
step one, excavating soil materials
Excavating and stacking soil materials of the side slope of the expansive soil river to be replaced and filled;
step two, sun-curing the soil material
Sun-drying the soil materials excavated and piled in the first step;
step three, crushing the soil material
Crushing the dried soil material in the second step to prepare crushed soil material with the particle size smaller than 10 cm;
fourth, soil test
The physical index parameters of the crushed soil materials in the third step are obtained through test;
step five, mixing the modified soil
Mixing the crushed soil material in the third step with cement and water according to the test result in the fourth step to prepare cement modified soil;
step six, changing and filling the modified soil
And C, filling the cement modified soil in the fifth step on the side slope of the expansive soil river excavated in the first step.
Through the construction process in this embodiment, through digging out the expansive soil of river course side slope to add cement and water in it, improve the nature and the structure of expansive soil, make it fill back after losing the expansion potential, solve the unstable problem of expansive soil river course side slope preferably.
In the embodiment, the operations such as crushing, stirring, filling and the like of the expansive soil are convenient for field operation, and the applicability is strong; the construction process in the embodiment preferably avoids the waste of soil materials and cement, and meanwhile, the construction process cannot influence on the on-site hydrologic environment and the like.
In this embodiment, the third step specifically includes the following steps:
s21, crushing the soil material by adopting a hydraulic crusher to prepare crushed soil material, wherein in the step, the swelling soil is added into the hydraulic crusher by a wheel loader, and calcium nodules or soil blocks with the grain diameter of more than 10cm in the swelling soil material are crushed by the crushing effect of the hydraulic crusher, so that the grain diameter of the crushed soil material meets the requirement;
s22, gathering and piling the crushed soil materials prepared in the step S21, wherein in the step, a wheel loader is adopted to gather and piling the crushed soil materials, so that the crushed soil materials are piled for later use;
s23, covering the crushed soil pile in the step S22 with plastic cloth through a covering device, wherein in the step, operators cover the crushed soil pile with the plastic cloth through the covering device, so that temporary protection is realized on the crushed soil pile.
Through the construction steps in this embodiment, the expanded soil that digs is preferably realized breaking, makes the particle diameter of expanded soil satisfy the requirement, is convenient for follow-up stirring.
In the embodiment, a stabilized soil mixer is adopted for mixing modified soil, in the step, crushed soil materials after crushing are transported to a collecting hopper of the stabilized soil mixer through a loader, and according to the physical parameters of the expansive soil obtained in the step four, a mixing weighing system of the stabilized soil mixer is used for controlling the weights of the soil materials, cement and water to mix according to test parameters, so as to prepare modified soil meeting requirements; by adopting the stabilized soil mixer for construction, the stabilized soil mixer can be continuously mixed, and is convenient for large-scale modified soil replacement construction.
In this embodiment, the sixth step specifically includes the following steps:
s41, loading by adopting a wheel loader and transporting modified soil to the side slope of the expansive soil river excavated in the step one by adopting a dump truck;
s42, tiling the modified soil in the step S41 by adopting a bulldozer, wherein in the step, the surfaces of the soil material tiled are required to be cleaned, and loose soil is removed; the bulldozer is adopted for paving, and in order to ensure the working surface of the rolling machine and the corner compactness, the paving sideline is superfilling in the horizontal distance. During paving, a bulldozer is adopted to push out steps on the slope surface so as to ensure soil body combination, and the height of the steps is the same as the thickness of the paved soil layer. In the spreading process, the spreading thickness is strictly controlled according to the parameters of the rolling test, and the spreading thickness can be detected by using a drill rod.
And S43, rolling the modified soil paved in the step S42 by adopting bump vibration rolling.
Through the construction steps in this embodiment, the modified soil is preferably filled on the side slope of the excavated river channel, so that the problem of instability of the side slope of the expansive soil river channel is solved.
Example 2
As shown in fig. 2 to 6, the present embodiment provides a covering device for covering a plastic cloth on a crushed soil pile.
The covering device in the embodiment comprises bottom plates 100 which are arranged in parallel, wherein the bottom plates 100 are connected through a telescopic connecting rod 110, and a movable wheel 101 is arranged at the lower end part of the bottom plate 100; the base plate 100 is symmetrically provided with mounting plates 210, rotatable rotating plates 120 are hinged between the mounting plates 210, and a clamping piece for clamping plastic cloth is arranged at one end part of each rotating plate 120; a driving assembly for driving the rotation plate 120 to rotate is provided in the bottom plate 100.
In the present embodiment, the link 110 connects the base plate 100 together by the arrangement of the link 110 and the moving wheel 101, so that a constructor can push the covering device to move; through the construction in this embodiment, constructor can promote the covering device and remove to the both sides of hack heap, and the hack heap is located between bottom plate 100 promptly, and it makes the rotation board 120 rotate and drives the hack heap that the plastics cloth covered between bottom plate 100 through the both corners of clamping piece centre gripping plastics cloth, preferably realizes covering plastics cloth on the hack heap. Through the covering device in this embodiment, the auxiliary constructor covers the plastic cloth on garrulous soil heap better, easy operation is convenient.
In this embodiment, a sliding groove 221 located between the mounting plates 210 is provided on the upper side of the bottom plate 100 along the length direction thereof, and a rotatable screw 222 is provided in the sliding groove 221; hinge holes 211 are symmetrically arranged between the mounting plates 210; the driving assembly comprises a rack 310 sliding in the sliding groove 221, the screw rod 222 is arranged through the rack 310 in a threaded manner, the other end of the rotating plate 120 is provided with a gear 320 matched with the rack 310, and the gear 320 is provided with a hinge shaft 321 extending into the corresponding hinge hole 211.
The rotation plate 120 is hinge-mounted between the mounting plates 210 by the arrangement of the hinge holes 211 and the hinge shafts 321 in the present embodiment; through the arrangement of the sliding groove 221, the screw rod 222 and the rack 310 in the embodiment, the screw rod 222 can rotate to drive the rack 310 to reciprocate in the sliding groove 221, wherein the rack 310 can reciprocate to drive the gear 320 to rotate due to the matched arrangement of the rack 310 and the gear 320, so that the rotating plate 120 is driven to rotate around the hinge shaft 321, and the plastic cloth is covered on the crushed soil pile.
In this embodiment, a motor 223 for driving the screw rod 222 to rotate is installed at the end of the bottom plate 100, and preferably, the screw rod 222 drives the rack 310 to reciprocate in the chute 221.
In this embodiment, the rotating plate 120 includes a first connecting plate 330a connected to the gear 320 and a second connecting plate 330b matched with the clamping member, wherein a second bar-shaped groove 331 is formed on a side surface of the first connecting plate 330a along a length direction of the second connecting plate, two second fixing posts 332 penetrating through the second bar-shaped groove 331 are formed on a side surface of the second connecting plate 330b, and second nuts 333 for fixing the first connecting plate 330a and the second connecting plate 330b are screwed on the second fixing posts 332.
By the construction in the present embodiment, the distance between the first connecting plate 330a and the second connecting plate 330b can be adjusted by screwing the second nut 333, so that the length of the rotating plate 120 can be adjusted, thereby being applicable to crushed soil piles with different heights, and making the applicability of the covering device wider; by arranging the two second fixing posts 332, the second connecting plate 330b is preferably limited, so as to avoid the rotation of the second connecting plate 330b when the second nut 333 is screwed.
In this embodiment, the clamping member includes a pressing plate 410 located at one end of the rotating plate 120, a side plate 420 located at a side surface of the rotating plate 120 is provided on the pressing plate 410, a first bar-shaped groove 421 is provided on the side plate 420 along the length direction of the rotating plate 120, a limit sliding groove 511 is provided on the side plate 420 along the length direction of the rotating plate 120, a limit sliding block located in the corresponding limit sliding groove 511 and sliding is provided on the side surface of the rotating plate 120, a first fixing column 430 extending out of the first bar-shaped groove 421 is provided on the side surface of the rotating plate 120, and a first nut 431 for fixing the side plate 420 is provided on the first fixing column 430.
In this embodiment, one corner of the plastic cloth is fixed by pressing between the pressing plate 410 and the end of the rotating plate 120; wherein, by unscrewing the first nut 431, the distance between the pressing plate 410 and one end of the rotating plate 120 can be adjusted by moving the side plate 420 up and down along the first bar-shaped groove 421, so that a corner of the plastic cloth is preferably convenient to be taken and placed between the pressing plate 410 and the rotating plate 120, and by screwing the first nut 431, the position between the pressing plate 410 and the rotating plate 120 is preferably fixed, so that the clamping and fixing of the corner of the plastic cloth is preferably realized; in this embodiment, the position of the side plate 420 is preferably limited by the matching arrangement of the limiting slider and the limiting chute 511, so that the side plate 420 is prevented from being driven to rotate when the first nut 431 is screwed, and the clamping of the clamping piece to the plastic cloth is prevented from being affected.
In this embodiment, the connecting rod 110 includes a long tube 111, and threaded rods 112 with threads extending into the long tube 111 are disposed at both ends of the long tube 111; the base plate 100 is provided with a threaded hole 231 through which the corresponding threaded rod 112 is threaded.
By the construction in the embodiment, the threaded rod 112 penetrates through the threaded hole 231 to extend into the long barrel 111, and the connecting rod 110 is preferably connected with the bottom plate, so that an operator can push the covering device to move conveniently; meanwhile, the distance that the threaded rod 112 stretches into the long barrel 111 can be adjusted, and then the length of the connecting rod 110 can be adjusted, so that the distance between the bottom plates 100 can be adjusted to adapt to different crushed soil piles, and the applicability of the covering device is wider.
In this embodiment, a baffle is disposed at the end of the threaded rod 112 outside the bottom plate 100, so as to preferably limit the threaded rod 112; handrails are provided on the baffle to facilitate the operator to rotate the threaded rod 112.
In summary, the foregoing description is only of the preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the claims should be construed to fall within the scope of the invention.
Claims (7)
1. The construction method for changing and filling the cement modified soil of the expansive soil river slope comprises the following steps:
step one, excavating soil materials
Excavating and stacking soil materials of the side slope of the expansive soil river to be replaced and filled;
step two, sun-curing the soil material
Sun-drying the soil materials excavated and piled in the first step;
step three, crushing the soil material
Crushing the dried soil material in the second step to prepare crushed soil material with the particle size smaller than 10 cm;
fourth, soil test
The physical index parameters of the crushed soil materials in the third step are obtained through test;
step five, mixing the modified soil
Mixing the crushed soil material in the third step with cement and water according to the test result in the fourth step to prepare cement modified soil;
step six, changing and filling the modified soil
Filling the cement modified soil in the fifth step on the side slope of the expansive soil river excavated in the first step; the third step specifically comprises the following steps:
s21, crushing the soil material by adopting a hydraulic soil crusher to prepare crushed soil material;
s22, piling the crushed soil materials prepared in the step S21;
s23, covering the broken soil pile in the step S22 with plastic cloth through a covering device;
the covering device comprises bottom plates (100) which are arranged in parallel, the bottom plates (100) are connected through telescopic connecting rods (110), and the lower end part of the bottom plate (100) is provided with a moving wheel (101); the base plate (100) is symmetrically provided with mounting plates (210), rotatable rotating plates (120) are hinged between the mounting plates (210), and clamping pieces for clamping plastic cloth are arranged at one end parts of the rotating plates (120); a driving component for driving the rotating plate (120) to rotate is arranged in the bottom plate (100);
the upper side surface of the bottom plate (100) is provided with sliding grooves (221) positioned between the mounting plates (210) along the length direction, and rotatable screw rods (222) are arranged in the sliding grooves (221); hinge holes (211) are symmetrically arranged between the mounting plates (210); the driving assembly comprises a rack (310) which is positioned in the chute (221) and slides, a screw rod (222) is arranged through the rack (310) in a threaded manner, a gear (320) matched with the rack (310) is arranged at the other end of the rotating plate (120), and a hinge shaft (321) which extends into the corresponding hinge hole (211) is arranged on the gear (320).
2. The construction method for changing and filling cement modified soil of the expansive soil river slope according to claim 1, which is characterized by comprising the following steps: and fifthly, stirring the modified soil by adopting a stabilized soil stirring machine.
3. The construction method for changing and filling cement modified soil of the expansive soil river slope according to claim 1, which is characterized by comprising the following steps: the sixth step specifically comprises the following steps:
s41, loading by adopting a wheel loader and transporting modified soil to the side slope of the expansive soil river excavated in the step one by adopting a dump truck;
s42, tiling the modified soil in the step S41 by adopting a bulldozer;
and S43, rolling the modified soil paved in the step S42 by adopting bump vibration rolling.
4. The construction method for changing and filling cement modified soil of the expansive soil river slope according to claim 1, which is characterized by comprising the following steps: the clamping piece is including being located clamp plate (410) of rotating plate (120) one end department, be equipped with on clamp plate (410) and be located curb plate (420) of rotating plate (120) side department, be equipped with first bar groove (421) along rotating plate (120) length direction on curb plate (420), be equipped with spacing spout (511) along rotating plate (120) length direction on curb plate (420), be equipped with on rotating plate (120) side and be located the spacing slider that corresponds spacing spout (511) internal sliding, be equipped with on rotating plate (120) side and stretch out first fixed column (430) of first bar groove (421), screw thread is equipped with first nut (431) that are used for fixed curb plate (420) on first fixed column (430).
5. The construction method for changing and filling cement modified soil of the expansive soil river slope according to claim 1, which is characterized by comprising the following steps: a motor (223) for driving the screw rod (222) to rotate is arranged at the end part of the bottom plate (100).
6. The construction method for changing and filling cement modified soil of the expansive soil river slope according to claim 1, which is characterized by comprising the following steps: the rotating plate (120) comprises a first connecting plate (330 a) connected with the gear (320) and a second connecting plate (330 b) matched with the clamping piece, a second strip-shaped groove (331) is formed in the side face of the first connecting plate (330 a) along the length direction of the side face, two second fixing columns (332) penetrating through the second strip-shaped groove (331) are formed in the side face of the second connecting plate (330 b), and second nuts (333) used for fixing the first connecting plate (330 a) and the second connecting plate (330 b) are arranged on the second fixing columns (332) in a threaded mode.
7. The construction method for changing and filling cement modified soil of the expansive soil river slope according to claim 1, which is characterized by comprising the following steps: the connecting rod (110) comprises a long cylinder (111), and threaded rods (112) with threads extending into the long cylinder (111) are arranged at two ends of the long cylinder (111); the bottom plate (100) is provided with a threaded hole (231) through which the corresponding threaded rod (112) passes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111446575.2A CN114232562B (en) | 2021-11-30 | 2021-11-30 | Construction method for changing and filling cement modified soil of expansive soil river slope |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111446575.2A CN114232562B (en) | 2021-11-30 | 2021-11-30 | Construction method for changing and filling cement modified soil of expansive soil river slope |
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| DE3838628A1 (en) * | 1988-11-15 | 1990-05-17 | Horst Vogelsang | Device for laying material webs, in particular bitumen and/or plastic webs or the like |
| CN103882855B (en) * | 2014-04-14 | 2016-01-13 | 长江水利委员会长江科学院 | Expansive soil modified cement and filling construction method |
| CN214885673U (en) * | 2020-12-29 | 2021-11-26 | 兖州中材建设有限公司 | Tunnel lining concrete aggregate heat preservation device |
| CN214430639U (en) * | 2021-02-05 | 2021-10-22 | 衡山敬安农业开发有限公司 | Simple device for mulching |
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