CN121556431A - Dynamic compaction construction device and method for engineering foundation - Google Patents
Dynamic compaction construction device and method for engineering foundationInfo
- Publication number
- CN121556431A CN121556431A CN202610085822.7A CN202610085822A CN121556431A CN 121556431 A CN121556431 A CN 121556431A CN 202610085822 A CN202610085822 A CN 202610085822A CN 121556431 A CN121556431 A CN 121556431A
- Authority
- CN
- China
- Prior art keywords
- wall
- iron plate
- dynamic compaction
- block
- weight
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- 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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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
本发明涉及工程地基技术领域，尤其是一种工程地基强夯施工装置，包括，起吊机和设置于起吊机上的起重绳；以及，重锤机构，包括设置于所述起重绳端部的上铁板、设置于所述上铁板外壁的挂块和设置于所述挂块外壁的挂杆；以及，连接机构，包括设置于所述上铁板外部的旋转圈、设置于所述上铁板端面的连接块和开设于所述连接块内部的插槽；以及，限位机构，包括设置于所述上铁板外壁的插条，通过起吊机与起重绳便于对重锤机构进行吊起来，通过控制起重绳端部脱钩器打开，进而使重锤机构便于完成自由落体运动，进而完成工程地基强夯施工。
This invention relates to the field of engineering foundation technology, and in particular to an engineering foundation dynamic compaction construction device, comprising: a crane and a lifting rope mounted on the crane; a counterweight mechanism including an upper iron plate disposed at the end of the lifting rope, a hanging block disposed on the outer wall of the upper iron plate, and a hanging rod disposed on the outer wall of the hanging block; a connecting mechanism including a rotating ring disposed on the outside of the upper iron plate, a connecting block disposed on the end face of the upper iron plate, and a slot opened inside the connecting block; and a limiting mechanism including an insert disposed on the outer wall of the upper iron plate. The counterweight mechanism is easily lifted by the crane and the lifting rope, and the counterweight mechanism is allowed to complete free fall by controlling the release hook at the end of the lifting rope, thereby completing the engineering foundation dynamic compaction construction.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to a dynamic compaction construction device and method for an engineering foundation.
Background
The dynamic compaction method, also called dynamic consolidation method, is a foundation treatment technology for improving the bearing capacity and compression modulus by applying huge impact energy to foundation soil, the technology mainly uses lifting equipment to lift a heavy hammer to a certain height so as to enable the heavy hammer to fall freely, the huge impact energy can force soil layer gaps to compress, the application range of the technology comprises gravelly soil, sandy soil, low-saturation silt soil, cohesive soil, collapsible loess, miscellaneous fill and other foundations, and the technology is particularly widely applied to foundation reinforcement of large-scale projects such as highways, railways, airports, nuclear power stations and the like;
Usually, a heavy weight is a heavy iron block, but because the weight of the heavy weight is fixed, if the heavy weight is needed, the heavy weight can only be directly replaced, but the heavy weight cannot be added in a superposition mode, and the heavy weight is more complicated in the carrying process and needs a larger transport vehicle for transportation, thus the cost is increased intangibly.
Disclosure of Invention
The present invention has been made in view of the above or the problems of the prior art that the assembly is inconvenient and the weight is increased.
Therefore, the invention aims to provide a dynamic compaction construction device for engineering foundation, which comprises,
Hoist and hoisting rope arranged on the hoist, and
The heavy hammer mechanism comprises an upper iron plate arranged at the end part of the lifting rope, a hanging block arranged on the outer wall of the upper iron plate, a hanging rod arranged on the outer wall of the hanging block, and
The connecting mechanism comprises a rotating ring arranged outside the upper iron plate, a connecting block arranged on the end surface of the upper iron plate, a slot arranged inside the connecting block, and
The limiting mechanism comprises a cutting arranged on the outer wall of the upper iron plate, wherein,
Lifting the heavy hammer mechanism to a height through the crane is convenient, and the heavy hammer mechanism is convenient to realize dynamic compaction of an engineering foundation by controlling connection and loosening of the lifting rope and the heavy hammer mechanism, so that the weight can be adjusted through the connecting mechanism with the increased cooperation, and the limiting function is increased through the cooperation of the limiting mechanism.
As a preferable scheme of the engineering foundation dynamic compaction construction device, the invention is characterized in that the end face of the upper iron plate is provided with a weight, and the end face of the weight is provided with a lower iron plate.
As an optimal scheme of the engineering foundation dynamic compaction construction device, the end face of the rotating ring is provided with the sliding block, the end face of the upper iron plate is provided with the sliding groove, and the sliding block arranged on the end face of the rotating ring is placed in the sliding groove arranged on the end face of the upper iron plate.
As a preferable scheme of the engineering foundation dynamic compaction construction device, the inner wall of the rotary ring is provided with the insert block, the end face of the lower iron plate is provided with the multifunctional hole, and the outer wall of the rotary ring is provided with the air hole.
As a preferable scheme of the engineering foundation dynamic compaction construction device, the number of the inserting blocks, the number of the multifunctional holes, the number of the connecting blocks and the number of the air holes are five, and the inserting blocks, the multifunctional holes, the connecting blocks and the air holes are distributed in an annular equidistant array by the perpendicular bisectors of the rotating rings.
As an optimal scheme of the engineering foundation dynamic compaction construction device, the outer wall of the cutting is in sliding connection with the inner part of the rotary ring, and the outer part of the cutting is in sliding connection with the inner part of the weight.
As a preferable scheme of the engineering foundation dynamic compaction construction device, a sliding bar is sleeved in the cutting, a limiting block is sleeved in the cutting, a second fixed rod is arranged at the end part of the limiting block, a movable plate is sleeved outside the second fixed rod, a first fixed rod is sleeved at the other end of the movable plate, a connecting plate is arranged at the end part of the first fixed rod, a first tension spring is arranged on the end face of the connecting plate, and the other end of the first tension spring is connected with the inside of the cutting.
As an optimal scheme of the engineering foundation dynamic compaction construction device, the sliding block is arranged on the outer wall of the connecting plate, the sliding groove is formed in the inner wall of the cutting, and the sliding block arranged on the outer wall of the connecting plate is placed in the sliding groove formed in the cutting.
As an optimal scheme of the engineering foundation dynamic compaction construction device, the inner wall of the cutting is provided with the fixed block, the outer wall of the fixed block is sleeved with the inner part of the sliding strip, and a second tension spring is arranged between the outer wall of the fixed block and the inner wall of the sliding strip.
In order to better achieve the purpose of the invention, the invention also provides a dynamic compaction construction method of the engineering foundation, which comprises the following steps:
Firstly, cleaning engineering foundations and leveling construction sites, ensuring that the ground is leveled and compacted in the early stage, then determining a drawing, marking the position to be compacted by lime and the like, measuring the initial height of the sites, and moving a crane to the region to be compacted;
Step two, through the fixed unhooking device in the end of the lifting rope on the crane, and hang the weight mechanism on the end of the unhooking device, through moving the weight mechanism to the marked position that needs to tamp above, control the shrink of the lifting rope at the same time, rise the weight mechanism to the height that the earlier stage measures and calculates;
step three, an operator triggers the unhooking device through a remote control or a pull rope to enable the heavy hammer mechanism to freely fall, after the heavy hammer mechanism falls to impact the foundation, the pit bottom elevation is measured, the single tamping settlement is calculated, and parameters such as the tamping times, the energy and the like are recorded;
Step four, repeating the step two and the step three until the number of times of tamping or the control standard specified by the design is reached, and matching the connecting mechanism and the limiting mechanism, so that the weight of the heavy hammer mechanism is continuously increased in the next dynamic compaction process, the weight is gradually increased in the compaction process, and a better tamping effect is conveniently achieved;
Filling up the tamping pit by using a bulldozer after finishing all tamping points in the first time, tamping the tamping pit for the second time after a period of time, and finally compacting the surface layer by using low-energy full tamping;
and step six, performing quality detection on the engineering foundation after dynamic compaction, performing construction after the engineering foundation is detected to be qualified, and performing foundation dynamic compaction again when the engineering foundation is detected to be unqualified.
The heavy hammer mechanism has the beneficial effects that the heavy hammer mechanism is convenient to hang up through the crane and the lifting rope, the unhooking device at the end part of the lifting rope is controlled to be opened, so that the heavy hammer mechanism is convenient to complete free falling body movement, further, the dynamic compaction construction of an engineering foundation is completed, and the plurality of heavy hammer mechanisms can be connected through the cooperation of the connecting mechanism and the limiting mechanism, so that the weight during dynamic compaction is convenient to increase, and the dynamic compaction effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a dynamic compaction construction device and method for engineering foundation.
FIG. 2 is a schematic diagram of the construction of heavy hammer mechanism of the dynamic compaction construction device and method of engineering foundation.
Fig. 3 is a schematic view of the bottom structure of the weight mechanism of the dynamic compaction construction device and method for engineering foundation.
Fig. 4 is a schematic cross-sectional structure diagram of the dynamic compaction construction device and method for the engineering foundation.
FIG. 5 is a schematic diagram of the internal structure of the weight mechanism of the dynamic compaction device and method for engineering foundation.
Fig. 6 is a schematic structural diagram of a limiting mechanism of the dynamic compaction construction device and method for engineering foundation.
Fig. 7 is a schematic diagram of a part of a limit mechanism of the dynamic compaction construction device and method for engineering foundation.
Fig. 8 is a schematic diagram of the internal structure of a sliding bar of the dynamic compaction construction device and method for engineering foundation.
The hoisting machine is shown as 11, the hoisting machine is shown as 12, the hoisting rope is shown as 2, the heavy hammer mechanism is shown as 21, the upper iron plate is shown as 22, the lower iron plate is shown as 23, the heavy weight is shown as 24, the hanging block is shown as 25, the hanging rod is shown as 3, the connecting mechanism is shown as 31, the rotating ring is shown as 32, the inserting block is shown as 33, the multifunctional hole is shown as 34, the connecting block is shown as 341, the inserting slot is shown as 35, the ventilation hole is shown as 4, the limiting mechanism is shown as 41, the inserting strip is shown as 42, the sliding strip is shown as 43, the limiting block is shown as 44, the movable plate is shown as 45, the connecting plate is shown as 46, the first tension spring is shown as 47, the first fixed rod is shown as 48, the second fixed rod is shown as 49, the fixed block is shown as 410, and the second tension spring is shown as the second tension spring.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Embodiment 1, referring to fig. 1 to 8, is a first embodiment of the present invention, which provides a dynamic compaction apparatus for an engineering foundation, capable of achieving a compaction effect of the engineering foundation, including,
A crane 11 and a hoisting rope 12 arranged on the crane 11, and
The weight mechanism 2 comprises an upper iron plate 21 arranged at the end part of the lifting rope 12, a hanging block 24 arranged on the outer wall of the upper iron plate 21, a hanging rod 25 arranged on the outer wall of the hanging block 24, and
The connecting mechanism 3 comprises a rotary ring 31 arranged outside the upper iron plate 21, a connecting block 34 arranged on the end surface of the upper iron plate 21, a slot 341 arranged inside the connecting block 34, and
The limiting mechanism 4 comprises a cutting 41 arranged on the outer wall of the upper iron plate 21, wherein,
Lifting the heavy hammer mechanism 2 to a height through the crane 11 is convenient, and the heavy hammer mechanism 2 is convenient to realize dynamic compaction of an engineering foundation by controlling connection and loosening of the lifting rope 12 and the heavy hammer mechanism 2, the weight can be adjusted through the connecting mechanism 3 with the increased cooperation, and the limiting function is increased through the cooperation of the limiting mechanism 4.
In summary, when in use, firstly, the engineering foundation is cleaned and the construction site is leveled, the ground is leveled and the ground is compacted in the earlier stage, then the drawing is determined, the position needing to be tamped is marked by lime and the like, the initial height of the site is measured, after the crane 11 is moved to the area needing to be tamped, the weight mechanism 2 is hung on the end part of the detacher through the unhooking device fixed on the end part of the lifting rope 12 on the crane 11, the contraction of the lifting rope 12 is controlled simultaneously by moving the weight mechanism 2 above the marked position needing to be tamped, the weight mechanism 2 is lifted to the height measured in the earlier stage, the operator triggers the unhooking device through the remote control or the pull rope, the weight mechanism 2 freely falls, and after the weight mechanism 2 falls to impact the foundation, measuring pit bottom elevation, calculating single tamping settlement, recording parameters such as tamping times, energy and the like, repeating the second and third steps until the parameters reach the designed and specified tamping times or control standard, and matching the connecting mechanism 3 and the limiting mechanism 4, further continuously increasing the weight of the heavy hammer mechanism 2 in the next dynamic tamping process, gradually increasing the weight, facilitating better tamping effect, filling the tamping pit by using a bulldozer after all tamping points are completed for the first time, performing second tamping after a period of time, finally filling the tamping surface layer with low energy, performing quality detection after dynamic tamping of the engineering foundation, performing construction after the detection is qualified, and performing foundation dynamic tamping again when the detection is unqualified.
Embodiment 2, referring to fig. 1 to 4, is a second embodiment of the present invention, which is different from the previous embodiment in that the embodiment provides structural optimization of the weight mechanism, solves the tamping problem, and is characterized in that the end face of the upper iron plate 21 is provided with a weight 23, and the end face of the weight 23 is provided with a lower iron plate 22.
Specifically, the end face of the rotary ring 31 is provided with a sliding block, the end face of the upper iron plate 21 is provided with a sliding groove, and the sliding block arranged on the end face of the rotary ring 31 is placed in the sliding groove arranged on the end face of the upper iron plate 21.
In sum, when using, through weight mechanism 2 that sets up, through the up end fixedly connected with hanging piece 24 of the last iron plate 21 in the weight mechanism 2, and with two peg 25 of hanging piece 24 outer wall fixedly connected with, and then be convenient for be connected with peg 25 with the unhooking device of lifting rope 12 end connection, and then can realize hanging weight mechanism 2, through the lower fixed surface of upper iron plate 21 being connected with pouring weight 23, through the lower terminal surface fixedly connected with down iron plate 22 of pouring weight 23, and then formed a weight, through accomplishing the free fall action with weight mechanism 2, and then be convenient for realize carrying out dynamic compaction to the engineering foundation.
Embodiment 3, referring to fig. 1 to 5, is a third embodiment of the present invention, and is different from the previous embodiment in that this embodiment provides structural optimization of a connection mechanism, solves the problem of adding weight, the inner wall of the rotating ring 31 is provided with an insert block 32, the end surface of the lower iron plate 22 is provided with a multifunctional hole 33, and the outer wall of the rotating ring 31 is provided with an air hole 35.
Specifically, the number of the inserting block 32, the multifunctional hole 33, the connecting block 34 and the ventilation holes 35 is five, and are arranged in an annular equidistant array of perpendicular bisectors of the rotating ring 31.
Specifically, the outer wall of the cutting 41 is slidably connected to the inside of the rotary ring 31, and the outside of the cutting 41 is slidably connected to the inside of the weight 23.
In sum, when using, through the coupling mechanism 3 of setting, the fixed surface is connected with has the slider on the rotatory circle 31 in the coupling mechanism 3, and through fixed connection's slider place in the spout of seting up of last iron plate 21 lower surface, and then the spacing of rotatory circle 31 of being convenient for, simultaneously also the rotation of rotatory circle 31 of being convenient for, simultaneously through the rotation interval of rotatory circle 31 of setting, and then can pile up two weight mechanism 2 together under the in-process increase weight of dynamic compaction, through the multi-functional hole 33 that sets up below iron plate 22 in weight mechanism 2 with the below with the connecting block 34 of below, and can enter into the inside of lower iron plate 22 and last iron plate 21 with the connecting block 34 of below, and through rotatory circle 31, through the rotation of rotatory circle 31 can drive the rotation of inserted block 32, and then be convenient for with the inserted block 32 can enter into the inside of the slot 341 of seting up in the connecting block 34 of below, consequently, can form a connection with two weight mechanisms 2, operate in proper order and be convenient for a plurality of mechanism 2 to connect together, simultaneously, through the multi-functional hole 33 of iron plate 22 below the iron plate 22 is in the top of the weight mechanism 2, and the top hole 35 is in the hole of the air-down is set up to the top of the air hole 35 when the air-down is convenient for the top is realized to the down, and the air hole 35 is set up down in the air-down hole of the air-down mechanism 2.
Embodiment 4, refer to fig. 1-8, and is a fourth embodiment of the present invention, unlike the previous embodiment, this embodiment provides structural optimization of a limiting mechanism, solves the problem of falling prevention, the inside of the cutting 41 is sleeved with a sliding bar 42, the inside of the cutting 41 is sleeved with a limiting block 43, the end of the limiting block 43 is provided with a second fixing rod 48, the outside of the second fixing rod 48 is sleeved with a movable plate 44, the other end of the movable plate 44 is sleeved with a first fixing rod 47, the end of the first fixing rod 47 is provided with a connecting plate 45, the end face of the connecting plate 45 is provided with a first tension spring 46, and the other end of the first tension spring 46 is connected with the inside of the cutting 41.
Specifically, the outer wall of the connecting plate 45 is provided with a sliding block, the inner wall of the cutting 41 is provided with a sliding groove, and the sliding block arranged on the outer wall of the connecting plate 45 is placed in the sliding groove formed in the cutting 41.
Further, a fixed block 49 is provided on the inner wall of the cutting 41, the outer wall of the fixed block 49 is sleeved with the inside of the sliding bar 42, and a second tension spring 410 is provided between the outer wall of the fixed block 49 and the inner wall of the sliding bar 42.
In sum, when the rotary weight limiting device is used, through the limiting mechanism 4, the cutting 41 in the limiting mechanism 4 is inserted into the side face of the rotary ring 31, so that the rotary ring 31 can rotate conveniently, meanwhile, the cutting 41 can be inserted into the weight 23, when the sliding strip 42 needs to be dragged, the sliding strip 42 slides in the cutting 41, the sliding strip 42 is far away from the connecting plate 45, sliding blocks are arranged on two sides of the connecting plate 45, the sliding blocks arranged on two sides of the connecting plate 45 slide in the cutting 41, the connecting plate 45 is pushed under the action of tension through the first tension spring 46, the movable plate 44 is movably sleeved outside the first fixed rod 47, the second fixed rod 48 is fixedly connected inside the end part of the limiting block 43, so that the movable plate 44 can conveniently pull the limiting block 43, the sliding block 43 can enter the inside the cutting 41, and the cutting 41 can be conveniently inserted into the weight 23;
After the cutting 41 is inserted into the weight 23, the sliding strip 42 is loosened, the cutting 41 is pushed, and since the fixing block 49 is fixed on the inner wall of the cutting 41, and the second tension spring 410 is fixedly connected to the fixing block 49, the sliding strip 42 is pushed by the second tension spring 410, and then the sliding strip 42 is pushed to the connecting plate 45, so that the limiting block 43 is convenient to penetrate through the cutting 41 and insert into the weight 23, the limiting block 43 is convenient to be limited by the weight 23, the rotation of the rotating ring 31 is avoided, the risk that the outer wall of the inserting block 32 is separated from the slot 341 formed in the connecting block 34 in the weight mechanism 2 below is avoided, and the safety is improved.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202610085822.7A CN121556431B (en) | 2026-01-22 | 2026-01-22 | A dynamic compaction device and method for engineering foundations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202610085822.7A CN121556431B (en) | 2026-01-22 | 2026-01-22 | A dynamic compaction device and method for engineering foundations |
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| Publication Number | Publication Date |
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| CN121556431A true CN121556431A (en) | 2026-02-24 |
| CN121556431B CN121556431B (en) | 2026-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202610085822.7A Active CN121556431B (en) | 2026-01-22 | 2026-01-22 | A dynamic compaction device and method for engineering foundations |
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Citations (7)
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| DE4114188A1 (en) * | 1991-05-01 | 1992-11-05 | Mueller Ludwig & Soehne | Method for soil compaction - vibrating plant operates surface layer contacting plate mounted column simultaneously vibrated to contact deeper soil |
| KR20150139742A (en) * | 2014-06-04 | 2015-12-14 | 최종선 | Ground compaction device |
| CN208933941U (en) * | 2018-09-26 | 2019-06-04 | 中国水利水电第四工程局有限公司 | A kind of dynamic consolidation construction hammer ram convenient for regulating weight |
| CN211340747U (en) * | 2019-11-09 | 2020-08-25 | 北京市政建设集团有限责任公司 | Multi-specification rammer and dynamic compaction machine thereof |
| CN116180705A (en) * | 2023-03-16 | 2023-05-30 | 河北冀东建设工程有限公司 | A rammer and foundation dynamic compaction construction technology using the rammer |
| CN219265979U (en) * | 2023-03-02 | 2023-06-27 | 赵方 | Engineering quality detection device |
| CN223017696U (en) * | 2024-07-26 | 2025-06-24 | 七台河市旗建工程质量检测有限公司 | High strain detection device of foundation pile |
-
2026
- 2026-01-22 CN CN202610085822.7A patent/CN121556431B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4114188A1 (en) * | 1991-05-01 | 1992-11-05 | Mueller Ludwig & Soehne | Method for soil compaction - vibrating plant operates surface layer contacting plate mounted column simultaneously vibrated to contact deeper soil |
| KR20150139742A (en) * | 2014-06-04 | 2015-12-14 | 최종선 | Ground compaction device |
| CN208933941U (en) * | 2018-09-26 | 2019-06-04 | 中国水利水电第四工程局有限公司 | A kind of dynamic consolidation construction hammer ram convenient for regulating weight |
| CN211340747U (en) * | 2019-11-09 | 2020-08-25 | 北京市政建设集团有限责任公司 | Multi-specification rammer and dynamic compaction machine thereof |
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| CN223017696U (en) * | 2024-07-26 | 2025-06-24 | 七台河市旗建工程质量检测有限公司 | High strain detection device of foundation pile |
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