CN112144546A - Horizontal scalable foundation ditch support frame based on U type shield constructs machine - Google Patents
Horizontal scalable foundation ditch support frame based on U type shield constructs machine Download PDFInfo
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- CN112144546A CN112144546A CN202011167833.9A CN202011167833A CN112144546A CN 112144546 A CN112144546 A CN 112144546A CN 202011167833 A CN202011167833 A CN 202011167833A CN 112144546 A CN112144546 A CN 112144546A
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- enclosing purlin
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Sustainable Development (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a transverse telescopic foundation pit supporting frame based on a U-shaped shield machine, which is applied to the construction of a splicing type comprehensive pipe gallery adopting the U-shaped shield machine, the supporting frame provides support for forward propulsion of the U-shaped shield machine, the supporting frame forms a supporting wall at the side edge of a foundation pit by arranging side plates, and provides opposite support between opposite side plates by arranging a transverse support and an enclosing purlin, so that the supporting frame can form a safe and stable construction space without being deeply inserted into the ground (piling), and further pile pulling and pile end pit backfill construction of a common supporting frame (steel sheet pile) are omitted, and the construction is simple and convenient; the second stull swing joint of a support frame makes things convenient for the bed course construction, shifts up the second stull and can assemble the construction for utility tunnel section of jurisdiction and provide sufficient space, but a plurality of support frames are assembled in succession to the support frame factory prefabrication then scene, is suitable for the needs of different flowing water segment lengths, and reuse can practice thrift construction cost many times.
Description
Technical Field
The invention relates to the field of building construction, in particular to a transverse telescopic foundation pit support frame based on a U-shaped shield machine.
Background
Utility tunnel can divide into cast-in-place piping lane and cast-in-place piping lane of non-two types, and wherein cast-in-place piping lane of non-can divide into prefabricated assembled utility tunnel of segmentation again and prefabricated overlapping formula utility tunnel. At present, the construction of urban underground comprehensive pipe galleries in China basically adopts a slope-laying excavation and foundation pit supporting open excavation construction mode, firstly, foundation pit supporting wall construction is carried out, after a foundation pit is excavated to a preset elevation, prefabricated pipe sections are transported to the site, the prefabricated pipe sections are hung in the foundation pit for installation, concrete is poured for node connection, and finally, after the concrete is solidified, the procedures of water prevention, backfill treatment and the like are carried out. The mode has the disadvantages of long construction period, large field workload, large pollution to surrounding environment, large surrounding traffic pressure and the like.
In order to solve the unfavorable conditions brought by the open cut method, a U-shaped open shield machine (hereinafter referred to as a U shield) is adopted for construction, no slope is placed during excavation, foundation pit support is not needed, excavation, unearthing and prefabricated pipe section hoisting can be implemented mechanically, the construction occupied area range is small, the labor force can be greatly saved, the construction period is shortened, and the construction cost is reduced. When the standard section is constructed, the U shield is propelled forwards, the gallery wall of the segmented prefabricated assembled pipe gallery provides a backseat support of the hydraulic jack, but when the construction is carried out on the assembled comprehensive pipe gallery or the full cast-in-place comprehensive pipe gallery, self-compacting concrete or common concrete is required to be poured, and the backseat support can be provided for the shield machine after the concrete is solidified to a certain strength, so that the U shield is not continuously propelled, the construction period is prolonged, and the construction cost is increased. In addition, when meeting the longitudinal section of piping lane and changing more, current fixed width's U shield is also difficult to adapt to.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a horizontal scalable foundation ditch support based on U type shield constructs machine makes U type shield construct the machine and can be applicable to equally fold piece together formula utility tunnel construction to adapt to the changeable condition of utility tunnel longitudinal section, thereby shorten construction cycle, reduce the manpower resources quantity, practice thrift construction cost, realize the construction of no vibration, noiselessness, green, environmental protection.
In order to solve the technical problems, the invention adopts the technical scheme that:
a transverse telescopic foundation pit support frame based on a U-shaped shield machine comprises side plates, enclosing purlins and cross braces, wherein the side plates comprise first side plates and second side plates, the cross braces at least comprise first cross braces and second cross braces, and the enclosing purlins comprise first enclosing purlins, second enclosing purlins, third enclosing purlins and fourth enclosing purlins;
two ends of the first transverse support are fixedly connected with the middle points of the first enclosing purlin and the second enclosing purlin respectively, and the first enclosing purlin and the second enclosing purlin are fixedly connected with the first positions close to one end of the first side plate and one end of the second side plate correspondingly;
two ends of the second transverse support are fixedly connected with the middle points of a third enclosing purlin and a fourth enclosing purlin respectively, and the third enclosing purlin and the fourth enclosing purlin are movably connected with a second position close to the other end of the first side plate and a second position close to the other end of the second side plate correspondingly;
the second cross brace is movable between the first position and the second position.
The invention has the beneficial effects that: the invention provides a transverse telescopic foundation pit supporting frame based on a U-shaped shield machine, which is applied to the construction of a splicing type comprehensive pipe gallery adopting the U-shaped shield machine, the supporting frame provides support for forward propulsion of the U-shaped shield machine, the supporting frame forms a supporting wall at the side edge of a foundation pit by arranging side plates, and provides opposite support between opposite side plates by arranging a transverse support and an enclosing purlin, so that the supporting frame can form a safe and stable construction space without being deeply inserted into the ground (piling), and pile pulling and pile end pit backfill construction of a common supporting frame (steel sheet pile) are further omitted, and the construction is simple and convenient; the second cross brace swing joint of the support frame makes things convenient for the bed course construction, shifts up the second cross brace and can assemble the construction for utility tunnel section of jurisdiction and provide sufficient space, but the support frame factory production prefabrication then carries out a plurality of support frames on the scene and assemble in succession, is suitable for the needs of different flowing water section lengths to this support frame reuse practices thrift construction cost many times.
Drawings
Fig. 1 is a front view of a transverse retractable foundation pit support frame based on a U-shaped shield machine according to a first embodiment of the present invention;
fig. 2 is a cross-sectional view of a lateral retractable foundation pit support frame based on a U-shaped shield machine according to a first embodiment of the invention;
fig. 3 is a top view of a lateral retractable foundation pit support frame based on a U-shaped shield machine according to a first embodiment of the present invention;
fig. 4 is a front view of a lateral retractable foundation pit support frame based on a U-shaped shield machine according to a second embodiment of the present invention;
fig. 5 is a cross-sectional view of a lateral retractable foundation pit support frame based on a U-shaped shield machine according to a second embodiment of the invention;
fig. 6 is a top view of a lateral retractable foundation pit support frame based on a U-shaped shield tunneling machine according to a second embodiment of the present invention.
Description of reference numerals:
1. a side plate; 11. a first side plate; 12. a second side plate;
2. enclosing purlins; 21. a first purlin; 22. a second purlin; 23. a third purlin; 24. a fourth purlin;
3. a cross brace; 31. a first cross brace; 311. a first cross bar; 312. an electric telescopic rod; 313. a second cross bar; 32. a second cross brace; 321. a linear guide rail; 322. an electric slider;
4. and (4) bracing.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 6, a horizontal retractable foundation pit support frame based on a U-shaped shield tunneling machine comprises side plates, enclosing purlins and cross braces, wherein the side plates comprise first side plates and second side plates, the cross braces at least comprise first cross braces and second cross braces, and the enclosing purlins comprise first enclosing purlins, second enclosing purlins, third enclosing purlins and fourth enclosing purlins;
two ends of the first transverse support are fixedly connected with the middle points of the first enclosing purlin and the second enclosing purlin respectively, and the first enclosing purlin and the second enclosing purlin are fixedly connected with a first position close to one end of the first side plate and a first position close to one end of the second side plate correspondingly;
two ends of the second transverse support are fixedly connected with the middle points of the third enclosing purlin and the fourth enclosing purlin respectively, and the third enclosing purlin and the fourth enclosing purlin are movably connected with a second position close to the other end of the first side plate and a second position close to the other end of the second side plate correspondingly;
the second cross brace is movable between a first position and a second position.
From the above description, the beneficial effects of the present invention are: the invention provides a transverse telescopic foundation pit supporting frame based on a U-shaped shield machine, which is applied to the construction of a splicing type comprehensive pipe gallery adopting the U-shaped shield machine, the supporting frame provides support for forward propulsion of the U-shaped shield machine, the supporting frame forms a supporting wall at the side edge of a foundation pit by arranging side plates, and provides opposite support between opposite side plates by arranging a transverse support and an enclosing purlin, so that the supporting frame can form a safe and stable construction space without being deeply inserted into the ground (piling), and pile pulling and pile end pit backfilling treatment of a common supporting frame (steel sheet pile) are further omitted, and the construction is simple and convenient; the second stull swing joint of a support frame makes things convenient for the bed course construction, shifts up the second stull and can assemble the construction for utility tunnel section of jurisdiction and provide sufficient space, but a plurality of supports of support frame continuous assembly are carried out to the support frame factory production prefabrication then scene, are suitable for the needs of different flowing water segment lengths, but reuse saving construction cost many times.
Further, first stull and second stull all include first horizontal pole, telescopic link and second horizontal pole, and the one end of first horizontal pole and second horizontal pole is all fixed on the purlin that encloses that corresponds, and the other end respectively with the both ends fixed connection of telescopic link.
Known by the above-mentioned description, make stull length adjustable through set up the telescopic link in the middle section to make the timbering can adapt to the changeable characteristic of the vertical section of the utility tunnel of piecing together.
Furthermore, the telescopic rod is an electric telescopic rod.
As can be seen from the above description, the adoption of the electric telescopic rod saves the externally-attached force-applying adjusting equipment, and the telescopic rod can adjust the length by depending on the power of the telescopic rod.
Furthermore, the remote control device is wirelessly connected with the electric telescopic rod and used for controlling the extension and the contraction of the electric telescopic rod.
According to the description, the remote control device is connected to control the length of the cross brace in a remote mode, the pressure value actually borne by the cross brace can be displayed, and the remote control devices of the telescopic rods of the plurality of support frames can be connected to the central control box to achieve central intelligent control.
Furthermore, the first side plate and the second side plate are provided with at least one guide rail perpendicular to the enclosing purlin from the first position to the second position, the third enclosing purlin and the fourth enclosing purlin are provided with slide blocks in positions corresponding to the guide rails, and the slide blocks are slidably connected with the guide rails.
According to the above description, the second transverse support, the third enclosing purlin and the fourth enclosing purlin are synchronously linearly moved up and down by arranging the guide rail and the slider, so that the second transverse support, the third enclosing purlin and the fourth enclosing purlin can be directly moved up and down by jacking equipment such as a jack, the movement is convenient, the deviation cannot be generated, and the stress is not uniform and unstable.
Furthermore, the device also comprises a controller electrically connected with the sliding block, wherein the sliding block is an electric sliding block, and the controller is used for controlling the electric sliding block to position and move.
According to the above description, the electric slider is adopted to drive the second cross brace, the third enclosing purlin and the fourth enclosing purlin to move up and down, the jacking equipment does not need to be attached externally, the connection controller can carry out moving positioning control on the electric slider, and the moving distance is controlled through the controller.
Furthermore, the fixed connection positions of the first cross brace and the first enclosing purlin and the second enclosing purlin as well as the fixed connection positions of the second cross brace and the third enclosing purlin and the fourth enclosing purlin are equally divided into at least two inclined braces, so that triangular supports are formed.
According to the description, the inclined strut is arranged at the fixed connection position of the transverse strut and the surrounding purlin to form a stable triangular support, so that the connection is firmer, safer and more reliable.
Furthermore, the side plates are profile steel side plates or reinforced concrete side plates.
Furthermore, enclose the purlin for shaped steel encloses the purlin.
As can be seen from the above description, the steel or reinforced concrete is used to manufacture the supporting frame and the support which can provide sufficient strength and rigidity, is wear-resistant, and can be reused many times.
Referring to fig. 1 to fig. 3, a first embodiment of the present invention is:
a horizontal telescopic foundation pit support frame based on a U-shaped shield machine comprises side plates 1, enclosing purlins 2 and cross braces 3, wherein each side plate 1 comprises a first side plate 11 and a second side plate 12, each enclosing purlin 2 comprises a first enclosing purlin 21, a second enclosing purlin 22, a third enclosing purlin 23 and a fourth enclosing purlin 24, each cross brace 3 comprises a first cross brace 31 and a second cross brace 32, and each side plate 1, each enclosing purlin 2 and each cross brace 3 can be made of steel or reinforced concrete;
the two ends of the first cross brace 31 are fixedly connected with the middle points of the first enclosing purlin 21 and the second enclosing purlin 22 respectively to form an H shape, the first enclosing purlin 21 and the second enclosing purlin 22 are fixedly connected with the first positions, close to the top ends, of the first side plate 11 and the second side plate 12, which correspond to the first enclosing purlin 21 and the second enclosing purlin 22 respectively, a certain distance is reserved between the first positions and the top end, and the distance can be set according to the actual customized size of the support frame;
two ends of a second transverse support 32 are fixedly connected with the middle points of a third enclosing purlin 23 and a fourth enclosing purlin 24 respectively to form an H shape, the third enclosing purlin 23 and the fourth enclosing purlin 24 are movably connected with a second position of the other end, far away from the first position, of the first side plate 11 and the second side plate 12 respectively, the second position is located at one end, close to the bottom surface of the foundation pit, of the two side plates 1 and is at a certain distance from the bottom surface, the distance at least meets the height required by foundation pit cushion construction, the movable connection between the enclosing purlin 2 and the side plates 1 can be connected through detachable bolts, and other movable connection modes can be adopted, so that the second transverse support 32, the third enclosing purlin 23 and the fourth enclosing purlin 24 can integrally move from the second position to the first position or move back to the initial second position from the first position between the two side plates 1;
The second cross brace 32 of the support frame of the first embodiment can move up and down by placing a jack below, and can also move through a hoisting device and be positioned and installed by constructors.
Referring to fig. 4 to fig. 6, a second embodiment of the present invention is:
on the basis of the first embodiment, in this embodiment, linear guide rails 321 perpendicular to the purlin 2 are respectively disposed on four side edges of the two side plates 1 from the first position to the second position on the first side plate 11 and the second side plate 12, electric sliders 322 are respectively mounted on the third purlin 23 and the fourth purlin 24 corresponding to the guide rails, the electric sliders 322 are connected with a controller, the electric sliders 322 drive the purlin 2 to move between the first position and the second position along the guide rails, so as to drive the second cross brace 32 to move up and down, the controller can control the moving distance of the sliders, the controller can be connected to a central control box for centralized control in the same manner as a remote control device of the electric telescopic rod 312, two guide rails are disposed on each side plate 1 near the two side edges, and can share the weight of the purlin 2 and the cross brace 3, or only one vertical guide rail can be arranged in the middle of the enclosing purlin 2 on the side plate 1 or a plurality of vertical guide rails can be uniformly distributed on the side plate 1.
The foundation pit support frame in the first embodiment and the second embodiment of the invention can be applied to the construction of a splicing type comprehensive pipe gallery adopting a U-shaped shield machine, a plurality of manufactured support frames are hung in a tail steel shell of the U-shaped shield machine for continuous splicing in a standard construction section, the support frames provide forward-propelled supporting force for the U-shaped shield machine, meanwhile, the continuously spliced support frames also form a section of construction space of the comprehensive pipe gallery, and the support frames can be hung for repeated use in the constructed construction section.
In conclusion, the transverse telescopic foundation pit support frame based on the U-shaped shield machine is applied to the construction of the splicing type comprehensive pipe gallery adopting the U-shaped shield machine, the support frame provides support for forward propulsion of the U-shaped shield machine, the support frame forms a support wall on the side edge of the foundation pit by arranging side plates, and opposite support between opposite side plates is provided by arranging a transverse support and an enclosing purlin; the second cross brace of the support frame is movably connected to facilitate cushion layer construction, the second cross brace is moved upwards to provide enough space for duct piece assembling construction of the comprehensive pipe gallery, the second cross brace is convenient to move up and down through the guide rail and the sliding block in a labor-saving manner, and the controller is arranged to control movement more intelligently; the cross brace is provided with the telescopic rod, so that the length of the cross brace can be adjusted to apply different supporting forces, the construction condition that the section size of the pipe gallery is changed can be adapted, a safe and stable construction space can be formed without inserting the support frame deeply into the ground (piling), pile pulling and pile end pit backfilling treatment of a common support frame (steel sheet pile) are also omitted, construction is simple and convenient, and the telescopic rod is connected with a remote control device to carry out remote control so that construction operation is intelligentized; the supporting frames can be prefabricated in an industrial mode and then a plurality of supporting frames are continuously assembled on site, so that the supporting frame is suitable for the requirements of different flow line segment lengths; the support frame can be repeatedly used for multiple times, construction cost is saved, the U-shaped shield tunneling machine can be applied to construction of the overlapped and spliced comprehensive pipe gallery by introducing the support frame, construction quality is good, construction speed is high, construction period is shortened, and cost is saved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (9)
1. A transverse telescopic foundation pit support frame based on a U-shaped shield machine is characterized by comprising side plates, enclosing purlins and cross braces, wherein the side plates comprise first side plates and second side plates, the cross braces at least comprise first cross braces and second cross braces, and the enclosing purlins comprise first enclosing purlins, second enclosing purlins, third enclosing purlins and fourth enclosing purlins;
two ends of the first transverse support are fixedly connected with the middle points of the first enclosing purlin and the second enclosing purlin respectively, and the first enclosing purlin and the second enclosing purlin are fixedly connected with the first positions close to one end of the first side plate and one end of the second side plate correspondingly;
two ends of the second transverse support are fixedly connected with the middle points of a third enclosing purlin and a fourth enclosing purlin respectively, and the third enclosing purlin and the fourth enclosing purlin are movably connected with a second position close to the other end of the first side plate and a second position close to the other end of the second side plate correspondingly;
the second cross brace is movable between the first position and the second position.
2. The transverse retractable foundation pit support frame based on the U-shaped shield tunneling machine according to claim 1, wherein the first cross brace and the second cross brace comprise a first cross bar, a retractable rod and a second cross bar, one end of each of the first cross bar and the second cross bar is fixed on the corresponding surrounding purlin, and the other end of each of the first cross bar and the second cross bar is fixedly connected with two ends of the retractable rod.
3. The transverse retractable foundation pit support frame based on the U-shaped shield tunneling machine as claimed in claim 2, wherein the retractable rod is an electric retractable rod.
4. The transverse retractable foundation pit support frame based on the U-shaped shield tunneling machine as claimed in claim 3, further comprising a remote control device wirelessly connected with the electric retractable rod, wherein the remote control device is used for controlling the extension and retraction of the electric retractable rod.
5. The support frame for the transverse retractable foundation pit based on the U-shaped shield tunneling machine according to claim 1, wherein the first side plate and the second side plate are provided with at least one guide rail perpendicular to the enclosing purlin from the first position to the second position, the third enclosing purlin and the fourth enclosing purlin are provided with sliding blocks at positions corresponding to the guide rails, and the sliding blocks are slidably connected with the guide rails.
6. The transverse retractable foundation pit support frame based on the U-shaped shield tunneling machine as claimed in claim 5, further comprising a controller electrically connected with the sliding block, wherein the sliding block is an electric sliding block, and the controller is used for controlling the electric sliding block to be positioned and moved.
7. The horizontal retractable foundation pit support frame based on the U-shaped shield tunneling machine according to claim 1, wherein at least two inclined struts are respectively arranged at the fixed connection positions of the first cross strut and the first enclosing purlin and the second enclosing purlin and the fixed connection positions of the second cross strut and the third enclosing purlin and the fourth enclosing purlin to form triangular supports.
8. The transverse retractable foundation pit support frame based on the U-shaped shield tunneling machine as claimed in claim 1, wherein the side plates are steel side plates or reinforced concrete side plates.
9. The transverse retractable foundation pit support frame based on the U-shaped shield tunneling machine as claimed in claim 1, wherein the enclosing purlin is a profile steel enclosing purlin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011167833.9A CN112144546A (en) | 2020-10-28 | 2020-10-28 | Horizontal scalable foundation ditch support frame based on U type shield constructs machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011167833.9A CN112144546A (en) | 2020-10-28 | 2020-10-28 | Horizontal scalable foundation ditch support frame based on U type shield constructs machine |
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| CN112144546A true CN112144546A (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011167833.9A Pending CN112144546A (en) | 2020-10-28 | 2020-10-28 | Horizontal scalable foundation ditch support frame based on U type shield constructs machine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113756325A (en) * | 2021-09-06 | 2021-12-07 | 百盛联合集团有限公司 | Emergency support device for foundation pit collapse |
| CN114032922A (en) * | 2021-12-13 | 2022-02-11 | 杭州森竹建设工程有限公司 | Rigid rib wall type pile wall foundation pit supporting structure and construction method |
| CN115059104A (en) * | 2022-08-01 | 2022-09-16 | 山东省大通公路工程有限责任公司 | Cofferdam structure for construction of underwater tie beam and construction method thereof |
| CN117230738A (en) * | 2023-11-14 | 2023-12-15 | 山西八建集团有限公司 | Construction device and method for supporting-free disassembly-free formwork of trench cover plate |
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2020
- 2020-10-28 CN CN202011167833.9A patent/CN112144546A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113756325A (en) * | 2021-09-06 | 2021-12-07 | 百盛联合集团有限公司 | Emergency support device for foundation pit collapse |
| CN114032922A (en) * | 2021-12-13 | 2022-02-11 | 杭州森竹建设工程有限公司 | Rigid rib wall type pile wall foundation pit supporting structure and construction method |
| CN115059104A (en) * | 2022-08-01 | 2022-09-16 | 山东省大通公路工程有限责任公司 | Cofferdam structure for construction of underwater tie beam and construction method thereof |
| CN115059104B (en) * | 2022-08-01 | 2024-03-12 | 山东省大通建设集团有限公司 | Cofferdam structure for underwater tie beam construction and construction method thereof |
| CN117230738A (en) * | 2023-11-14 | 2023-12-15 | 山西八建集团有限公司 | Construction device and method for supporting-free disassembly-free formwork of trench cover plate |
| CN117230738B (en) * | 2023-11-14 | 2024-02-02 | 山西八建集团有限公司 | Construction device and method for supporting-free disassembly-free formwork of trench cover plate |
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