CN216193750U - Improved structure of temporary pavement covering plate for subway construction - Google Patents
Improved structure of temporary pavement covering plate for subway construction Download PDFInfo
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- CN216193750U CN216193750U CN202122450204.3U CN202122450204U CN216193750U CN 216193750 U CN216193750 U CN 216193750U CN 202122450204 U CN202122450204 U CN 202122450204U CN 216193750 U CN216193750 U CN 216193750U
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Abstract
The temporary pavement working plate improved structure for subway construction comprises steel cover plates and cover plate beams, wherein the steel cover plates are arranged in a plurality of adjacent positions, two ends of each steel cover plate are supported through the upper ends of the cover plate beams respectively, the lower ends of the cover plate beams are connected to foundation pit concrete supports, a bridging component is arranged between the two cover plate beams and comprises inclined struts and inclined strut connectors, the two inclined struts are connected to the cover plate beams through the inclined strut connectors, the middle of each inclined strut is connected to form an X-shaped support, each steel cover plate comprises an upper steel plate and a lower steel plate, the upper steel plate and the lower steel plate are arranged oppositely, the peripheries of the upper steel plate and the lower steel plate are connected through side steel plates, each cover plate beam comprises an I-shaped steel and a stiffening rib, and the stiffening ribs are arranged on the side faces of the I-shaped steel; therefore, the structural assembly is safe and reliable, can standardize components, is fast to disassemble and assemble, can be recycled, has low construction cost, and can effectively meet the use requirement of temporary road surfaces in subway construction.
Description
Technical Field
The utility model relates to the technical field of subway engineering construction, in particular to an improved structure of a temporary pavement working covering plate for subway construction.
Background
In recent years, the development of urban underground space in China has entered a high-speed development period, and as far as 2020, the total length of urban rail transit operation lines in China is about 7970km, and when the approved rail transit planning is implemented, the length exceeds 7000km, and the urban underground space in China enters a gridding stage for a plurality of places. The crossing and crossing conditions between newly-built subway lines and existing roads and buildings are continuously increased, and how to effectively reduce the influence of construction on the traffic operation of the existing urban roads in the subway construction process is of great importance without causing traffic jam. In order to solve the problem, the cover excavation method is widely applied to the construction of the subway station. The construction method can recover traffic in a short time, has good construction conditions and high structural reliability, but usually needs a large amount of temporary non-standard supporting materials in the use process, causes waste and brings inconvenience to construction.
At present, a subway cover-excavation construction station is constructed by a cover-excavation sequential method basically, and a six-four military-use beam and precast concrete cover plate temporary pavement assembly is adopted. The sixty-four military beams need to be rented by relevant departments. The precast concrete cover plate is basically precast on site, and the temporary pavement assembly is dismantled after the station construction is finished. The precast concrete apron abandonment can not reuse, produces a large amount of building rubbish, causes the resource serious waste, has the environmental sanitation problems such as the component prefabrication process is slow, causes dust, noise during the prefabrication simultaneously.
In order to solve the problems, a construction covering plate structure is proposed in recent years, and the construction covering plate structure is generally a cover plate formed by welding section steel and steel plates in a combined mode, and is suitable for shallow-buried subway stations or municipal foundation pit engineering under the conditions that surrounding buildings are dense, traffic is busy, pipelines are more, the pipeline moving cost is high, and the like. However, the structure is rarely researched domestically, the designed structure is simple, the practicability is poor, the consideration on the aspects of lower support connection, overall stability and the like is still insufficient, a matching technology and field application experience are lacked, and the current utilization rate is still low. Design schemes proposed by some foreign companies cannot meet the use requirements of China, have problems in structural performance requirements, matching technology and the like, and are difficult to apply.
At present, in the engineering of covering a working plate on a temporary pavement for excavation of a foundation pit of a subway station, the following problems mainly exist:
1) when the precast concrete cover plate is adopted, the precast concrete cover plate can not be reused after being dismantled after construction is finished, a large amount of building waste is generated, and the resource is seriously wasted.
2) The manufacturing process of the precast concrete cover plate is slow, the maintenance period is long, and the project progress is not facilitated; meanwhile, the quality of the cover plate is not well controlled, and environmental sanitation problems such as dust and noise can be caused during prefabrication.
3) At present, no special work plate covering structure aiming at the use of the subway station foundation pit exists, the existing pavement work plate covering structure is simple in design, lacks of professional designs such as drainage, shock absorption and noise reduction, and is relatively poor in practicability.
4) The existing steel cover plate structure is often directly placed on a cross brace at the top of a foundation pit, a reliable connection measure between the cover plate beam and the cross brace at the top of the foundation pit is lacked, the bearing capacity checking calculation requirement of structure design cannot be met, and the safe development of engineering is difficult to guarantee.
5) The existing steel covers the board structure, the cover plate beam lacks the reinforcement measure for preventing self instability, the adopted I-steel is easy to be damaged by instability under the action of the eccentric load transferred downwards by the steel cover plate, and the safety is not enough.
6) The existing steel covers the worker's board structure, lacks reliable horizontal support between the adjacent apron roof beam, takes place to collapse in succession easily and topples, has very big potential safety hazard. When the traditional X-shaped bridging is used for supporting between adjacent cover plate beams, the problem that accurate connection cannot be achieved due to construction positioning errors is often caused.
7) Some foreign companies propose the design scheme of the covering plate, but the covering plate is difficult to be native, cannot meet the use requirements of China, has problems in the aspects of structural performance requirements, matching technology and the like, and is difficult to be applied.
Therefore, a novel temporary pavement working plate improved structure for subway construction is urgently needed, the use requirements of subway engineering in China can be met, the processing is convenient, the components can be standardized and disassembled quickly, the accessories can be repeatedly utilized, and the method is very important for guaranteeing smooth development of engineering and saving resources.
In view of the above-mentioned drawbacks, the present inventors have made extensive studies and design to overcome the above-mentioned drawbacks by designing and developing an improved structure of a temporary road surface covering plate for subway construction, which combines the experience and results of related industries for many years.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an improved structure of a temporary pavement working plate for subway construction, which can effectively overcome the defects of the prior art, effectively reduce the influence of construction on the surrounding environment, has safe and reliable structural components, can standardize components, is quick to disassemble and assemble, can be recycled, has low construction cost, and can effectively ensure the use requirement of the temporary pavement for subway construction.
In order to achieve the purpose, the utility model discloses an improved structure of a temporary pavement working covering plate for subway construction, which comprises a plurality of steel cover plates and cover plate beams, wherein the steel cover plates are adjacently arranged, two ends of each steel cover plate are respectively supported through the upper ends of the cover plate beams, and the lower ends of the cover plate beams are connected to foundation pit concrete supports, and the structure is characterized in that:
a scissor support assembly is arranged between the two cover plate beams and comprises two inclined supports and inclined support connectors, the two ends of each inclined support are connected to the cover plate beams through the inclined support connectors, and the middles of the two inclined supports are connected to form an X-shaped support;
each steel apron contains steel sheet and lower steel sheet, go up the steel sheet and set up relatively with lower steel sheet and the periphery is connected through the side steel sheet, the apron roof beam contains I-steel and stiffening rib, the stiffening rib sets up in the side of I-steel.
Wherein: go up the steel sheet upper surface and have set gradually anticorrosive coating and anti-skidding wear-resisting coating, go up the steel sheet and be equipped with the cross stiffening rib down between the steel sheet.
Wherein: go up the steel sheet and be equipped with a plurality of drain pipes between the steel sheet down at the interval, be equipped with waterproof stripe between two adjacent steel cover plates, be equipped with the rubber shock pad between the top of I-steel and the steel cover plate.
Wherein: still contain coupling assembling, coupling assembling includes spacing angle steel, spacing angle steel symmetry sets up at the upper and lower end of I-steel inboard, and one side of each spacing angle steel welds on the I-steel, and supports with steel decking and foundation ditch concrete respectively on the another side and be connected.
Wherein: the connecting assembly further comprises anti-overturning angle steels, the anti-overturning angle steels are symmetrically arranged on the inner sides of the anti-overturning angle steels by taking the I-shaped steel as a center respectively, each anti-overturning angle steel comprises a short edge and a long edge, a corner between each short edge and each long edge is 135 degrees, and the short edge of the upper anti-overturning angle steel is connected to the lower steel plate; the minor face and the foundation ditch concrete brace of antidumping angle steel of lower part are connected, the long limit one end of antidumping angle steel all is connected with the stiffening rib.
Wherein: still be equipped with the fixed subassembly in bottom, it includes anchor bolt and bar planting glue, the anchor bolt anchor is gone into foundation ditch concrete and is supported and fill the bar planting glue.
Wherein: the bottom fixing component is also provided with a pre-buried steel plate, the pre-buried steel plate is pre-buried on the upper surface of the foundation pit concrete support and is in an inverted-Chinese-character-shaped shape, and the anchoring bolts and the bar planting glue penetrate through the pre-buried steel plate and then are connected with the foundation pit concrete support.
Wherein: each inclined strut is a cylinder, the middle part of each inclined strut is a semi-cylinder, an inclined strut bolt hole is formed in the middle of each inclined strut, and bolts are inserted into the inclined strut bolt holes to be connected to form the X-shaped support.
Wherein: the both ends and the internal thread cap threaded connection of bracing, the one end of internal thread cap is the hollow cylinder of internal screw thread in order to be connected with the external screw thread of bracing, and the rotatable connection of the other end is in order effectively to adjust the bracing length in bracing connector through threaded connection's rotation regulation from this.
Wherein: thereby the other end of internal thread cap is protruding and nested freely rotating in the inside ability of bracing connector for T shape, thereby the one end of bracing connector is connected in internal thread cap, thereby the other end sets up the bolt hole for the semicircle column and the centre and is connected with the stiffening rib.
As can be seen from the above, the improved structure of the temporary road surface covering plate for subway construction of the present invention has the following effects:
1. the structural component is safe and reliable, can make the component standardized, the dismouting is quick, cyclic utilization, and engineering cost is low, can guarantee subway construction temporary pavement operation requirement effectively.
2. Effectively alleviate steel apron self weight to promote the bending resistance of structure, effectively strengthen steel apron and apron roof beam and foundation ditch concrete support's being connected, prevent the structural instability.
3. Effective adjustment can be realized, selectivity is increased, and favorable conditions are provided for design; meanwhile, the requirement on construction positioning precision is greatly reduced, and the problem that a standard component cannot be used when the construction precision is insufficient is solved.
The details of the present invention can be obtained from the following description and the attached drawings.
Drawings
Fig. 1 shows an overall structural view of the improved structure of the temporary pavement covering plate for subway construction of the present invention.
Fig. 2 shows a front view of the main structure of the present invention.
Figure 3 shows a top view of the present invention.
Fig. 4 shows a schematic structural view of the steel deck of the present invention.
Fig. 5 shows a schematic structural view of the deck beam of the present invention.
FIG. 6 shows a schematic view of a scissor assembly of the present invention.
Fig. 7 shows a schematic view of a portion of the structure of the inventive scissor assembly.
FIG. 8 illustrates a top view of a portion of the structure of the cross-brace assembly of the present invention.
Reference numerals:
go up steel sheet 1, lower steel sheet 2, cross stiffening rib 3, anticorrosive coating 4, anti-skidding wear-resistant coating 5, drain pipe 6, waterproof stripe 7, lower steel sheet bolt hole 8, I-steel 9, stiffening rib 10, stiffening rib bolt hole 11, lower steel sheet bolt hole 12, spacing angle steel 13, connecting bolt 14, anti-overturning angle steel 15, anti-overturning angle steel bolt 17, rubber shock pad 18, anchor bolt 19, bar planting glue 20, pre-buried steel sheet 21, bracing 22, bracing bolt hole 23, internal thread cap 24, bracing connector 25.
Detailed Description
Referring to fig. 1 to 8, there are shown the improved structure of the temporary pavement working sheet for subway construction according to the present invention.
Subway construction is with interim road surface cover worker board improvement structure includes steel decking, apron roof beam, coupling assembling, bottom fixed subassembly and bridging subassembly, the steel decking is a plurality of independent steel decking to rapid Assembly, every steel decking's both ends are put up respectively on two apron roof beams, make the structure atress more reasonable, select suitable quantity to assemble according to the demand in the use, thereby be suitable for more extensively, the upper end of apron roof beam is supported in the steel decking, and the lower extreme is connected in foundation ditch concrete support, coupling assembling is located between apron roof beam and steel decking and the foundation ditch concrete support in order to be connected to the apron roof beam respectively to steel decking and foundation ditch concrete support, the bridging subassembly sets up in order to provide scissors formula support between two apron roof beams.
Each steel apron comprises last steel sheet 1, lower steel sheet 2 and cross stiffening rib 3, go up steel sheet 1 and lower steel sheet 2 and set up relatively, and the periphery connects in order to form the major structure of steel apron through the side steel sheet, cross stiffening rib 3 sets up between last steel sheet 1 and lower steel sheet 2 to effectively alleviate steel apron self weight, and promote the bending resistance of structure.
Wherein, go up steel sheet 1's thickness and should be greater than 20mm, and the upper surface has set gradually anticorrosive coating 4, anti-skidding wear-resistant coating 5 to when guaranteeing the apron bearing capacity, effectively improve life, provide good ground sense of grabbing simultaneously for the vehicle traveles. The thickness of the stiffening rib of the cross stiffening rib 3 is larger than 10mm, the weight of the steel cover plate is reduced, the bending resistance of the structure is improved, the weight of the steel cover plate is reduced, and the bending resistance of the structure is improved efficiently.
Referring to fig. 4 simultaneously, go up steel sheet 1 and be equipped with a plurality of drain pipes 6 between the steel sheet 2 at the interval to be used for in time discharging surface ponding in the rainy day, prevent that steel sheet top ponding from corroding rust and the inside water of depositing of steel cover. Prevent simultaneously that steel sheet ponding from corroding to rust, be equipped with joint strip 7 between two adjacent steel cover plates for shutoff inter-plate clearance prevents that the rainwater from flowing into below foundation ditch, avoids two adjacent steel cover plates to collide using the contact simultaneously, plays noise reduction effect, lower steel sheet 2 is equipped with a plurality of steel sheet bolt holes 8 down, makes steel cover plate and lower part member connection through the bolt.
Referring to fig. 5, the deck beam supports the steel deck and is composed of i-beams 9 and stiffening ribs 10, wherein the type of the i-beams 9 is greater than 45a, so as to ensure sufficient bending resistance, and prevent the flange plate from buckling and deforming under the action of the eccentric load of the vehicle, and the structure is more reliable. Stiffener 10 sets up in the side of I-steel 9 to effectively prevent that the flange board of I-steel from taking place buckling deformation, the interval is provided with 3 stiffener bolt holes 11 on the stiffener 10, so that be connected with coupling assembling and bridging subassembly, the lower part of I-steel 9 is equipped with bolt hole 12 under the I-steel, thereby supports through the concrete of anchor bolt and foundation ditch and is connected.
The connecting assembly comprises limit angle steels 13 and anti-overturning angle steels 15, the limit angle steels 13 are 4 in number and are symmetrically arranged on the inner sides of the upper end and the lower end of the I-beam 9 respectively (see fig. 2), one side of each limit angle steel 13 is welded on the I-beam 9, bolt holes are formed in the other side of each limit angle steel 13 so as to be connected with a steel cover plate and a foundation pit concrete support respectively through connecting bolts 14, wherein the two limit angle steels 13 on the upper part are connected to the lower steel plate 2 through the connecting bolts 14, the two limit angle steels 13 on the lower part are connected to a pre-embedded plate 21 in the foundation pit concrete support through the connecting bolts 14 to play a certain role in limiting position and fixing, the anti-overturning angle steels 15 are 8 in number and are symmetrically arranged on the inner sides of the I-beam 9 respectively by taking the I-beam 9 as a center (see fig. 2 and 3 simultaneously), each anti-overturning angle steel 15 comprises a short edge and a long edge, the rotation angle between the short edge and the long edge is 135 degrees, the short sides and the long sides are provided with bolt holes, wherein one ends of the short sides of the upper 4 anti-overturning angle steels 15 are connected to the lower steel plate 2 through lower steel plate bolts 16 and lower steel plate bolt holes 8; one end of the short side of the lower 4 anti-overturning angle steels 15 is connected with the bar-planting glue 20 and the concrete support of the foundation pit through an anchor bolt 19, and one end of the long side of each anti-overturning angle steel 15 is connected with the reinforcing rib bolt hole 11 in the middle of the reinforcing rib 10 through an anti-overturning angle steel bolt 17.
A rubber shock pad 18 is arranged between the top of the I-steel 9 and the steel cover plate, plays a role in supporting the steel cover plate, has a certain buffering function, enables the steel cover plate and the cover plate beam to be hinged, and enables the whole structure to be stressed more reasonably; the steel cover plate is prevented from being contacted and collided with the cover plate beam under the action of dynamic load of the vehicle, and the effects of shock absorption and noise reduction are achieved.
Wherein, the fixed subassembly in bottom includes anchor bolt 19, bar planting glue 20 and pre-buried steel sheet 21, anchor bolt 19 diameter should be greater than 18mm, and the anchor goes into lower part concrete support 20mm, corresponds position drilling with foundation ditch concrete support when using, fills bar planting glue 20, puts into anchor bolt 19 afterwards, treats to accomplish after the bar planting glue solidifies and connects. The anchor bolt 10 and the bar-planting glue 20 play a role in fixing, are easy to operate, and reduce the construction difficulty while ensuring the reliability. The embedded steel plate 21 is embedded in the upper surface of the concrete support in advance according to the design position requirement, is in an inverted 'mountain' shape, has the thickness larger than 16mm, and is connected and fixed with the I-shaped steel 9 through the limiting angle steel 13 at the lower part. And two pairs of anchor bolts 19 and bar planting glue 20 penetrate through the embedded steel plate and are connected with the concrete support of the lower foundation pit
Referring to fig. 6 and 7, the cross brace assembly includes two cross braces 22 and cross brace connectors 24, referring to fig. 6, the cross braces 22 are two, both ends of the two cross braces 22 are fixed to the cover plate beam and connected in the middle to be oppositely disposed in a scissor shape, and more particularly, each cross brace 22 is a cylinder and has a semi-cylinder in the middle, a cross brace bolt hole 23 is formed in the middle of the cross brace 22, the two cross braces 22 are oppositely used during use and are connected to each other by inserting a bolt into the cross brace bolt hole 23 to form an X-shaped support, both ends of the cross brace 22 are provided with external threads to be connected to an internal thread cap 23, one end of the internal thread cap 23 is a hollow cylinder with internal threads to be connected to the external threads of the cross brace 22, and the other end is a T-shaped protrusion and is nested inside the cross brace connectors 24 and can freely rotate, one end of the cross brace connectors 24 is connected to the internal thread cap 23, the other end of the diagonal brace is a semi-cylinder, and a bolt hole is formed in the middle of the diagonal brace, so that the diagonal brace is connected with the stiffening rib bolt holes 11 on the upper side and the lower side of the stiffening rib 10, wherein the length of the diagonal brace can be effectively adjusted through the rotation adjustment of the external thread end of the diagonal brace 22 and the internal thread cap 23, the selectivity of the distance between the adjacent I-shaped steels 9 is increased, and favorable conditions are provided for design; meanwhile, the requirement on construction positioning precision is greatly reduced, and the problem that a standard component cannot be used when the construction precision is insufficient is solved.
Therefore, when the subway construction temporary pavement is constructed by using the method, the structure is reliable, the disassembly and the assembly are quick, the recycling can be realized, and the construction cost is low.
It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.
Claims (10)
1. The utility model provides a subway construction covers worker's board improvement structure with interim road surface, includes steel cover plate and apron roof beam, the steel cover plate is a plurality of and adjacent setting, and the both ends of each steel cover plate are supported through the upper end of apron roof beam respectively, the lower extreme of apron roof beam is connected in foundation ditch concrete and is supported its characterized in that:
a scissor support assembly is arranged between the two cover plate beams and comprises two inclined supports and inclined support connectors, the two ends of each inclined support are connected to the cover plate beams through the inclined support connectors, and the middles of the two inclined supports are connected to form an X-shaped support;
each steel apron contains steel sheet and lower steel sheet, go up the steel sheet and set up relatively with lower steel sheet and the periphery is connected through the side steel sheet, the apron roof beam contains I-steel and stiffening rib, the stiffening rib sets up in the side of I-steel.
2. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 1, wherein: go up the steel sheet upper surface and have set gradually anticorrosive coating and anti-skidding wear-resisting coating, go up the steel sheet and be equipped with the cross stiffening rib down between the steel sheet.
3. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 1, wherein: go up the steel sheet and be equipped with a plurality of drain pipes between the steel sheet down at the interval, be equipped with waterproof stripe between two adjacent steel cover plates, be equipped with the rubber shock pad between the top of I-steel and the steel cover plate.
4. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 1, wherein: still contain coupling assembling, coupling assembling includes spacing angle steel, spacing angle steel symmetry sets up at the upper and lower end of I-steel inboard, and one side of each spacing angle steel welds on the I-steel, and supports with steel decking and foundation ditch concrete respectively on the another side and be connected.
5. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 4, wherein: the connecting assembly further comprises anti-overturning angle steels, the anti-overturning angle steels are symmetrically arranged on the inner sides of the anti-overturning angle steels by taking the I-shaped steel as a center respectively, each anti-overturning angle steel comprises a short edge and a long edge, a corner between each short edge and each long edge is 135 degrees, and the short edge of the upper anti-overturning angle steel is connected to the lower steel plate; the minor face and the foundation ditch concrete brace of antidumping angle steel of lower part are connected, the long limit one end of antidumping angle steel all is connected with the stiffening rib.
6. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 1, wherein: still be equipped with the fixed subassembly in bottom, it includes anchor bolt and bar planting glue, the anchor bolt anchor is gone into foundation ditch concrete and is supported and fill the bar planting glue.
7. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 6, wherein: the bottom fixing component is also provided with a pre-buried steel plate, the pre-buried steel plate is pre-buried on the upper surface of the foundation pit concrete support and is in an inverted-Chinese-character-shaped shape, and the anchoring bolts and the bar planting glue penetrate through the pre-buried steel plate and then are connected with the foundation pit concrete support.
8. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 1, wherein: each inclined strut is a cylinder, the middle part of each inclined strut is a semi-cylinder, an inclined strut bolt hole is formed in the middle of each inclined strut, and bolts are inserted into the inclined strut bolt holes to be connected to form the X-shaped support.
9. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 8, wherein: the both ends and the internal thread cap threaded connection of bracing, the one end of internal thread cap is the hollow cylinder of internal screw thread in order to be connected with the external screw thread of bracing, and the rotatable connection of the other end is in order effectively to adjust the bracing length in bracing connector through threaded connection's rotation regulation from this.
10. The improved structure of a temporary road surface covering plate for subway construction as claimed in claim 9, wherein: thereby the other end of internal thread cap is protruding and nested freely rotating in the inside ability of bracing connector for T shape, thereby the one end of bracing connector is connected in internal thread cap, thereby the other end sets up the bolt hole for the semicircle column and the centre and is connected with the stiffening rib.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122450204.3U CN216193750U (en) | 2021-10-12 | 2021-10-12 | Improved structure of temporary pavement covering plate for subway construction |
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| CN202122450204.3U CN216193750U (en) | 2021-10-12 | 2021-10-12 | Improved structure of temporary pavement covering plate for subway construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114775690A (en) * | 2022-06-17 | 2022-07-22 | 北京建工土木工程有限公司 | Temporary bearing device for roof by cover-excavation method and construction method thereof |
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2021
- 2021-10-12 CN CN202122450204.3U patent/CN216193750U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114775690A (en) * | 2022-06-17 | 2022-07-22 | 北京建工土木工程有限公司 | Temporary bearing device for roof by cover-excavation method and construction method thereof |
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