CN113217013A - Protective structure is used in construction of simple and easy assembled abrupt slope tunnel entrance to a cave - Google Patents
Protective structure is used in construction of simple and easy assembled abrupt slope tunnel entrance to a cave Download PDFInfo
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- CN113217013A CN113217013A CN202110678311.3A CN202110678311A CN113217013A CN 113217013 A CN113217013 A CN 113217013A CN 202110678311 A CN202110678311 A CN 202110678311A CN 113217013 A CN113217013 A CN 113217013A
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- 238000010276 construction Methods 0.000 title claims abstract description 33
- 230000001681 protective effect Effects 0.000 title claims abstract description 30
- 230000008093 supporting effect Effects 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 description 10
- 238000004873 anchoring Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a simple assembly type protective structure for steep slope tunnel entrance construction, and relates to the technical field of construction protection. The invention comprises a front end protection frame, a rear end protection frame and a side protection frame positioned between the front end protection frame and the rear end protection frame, wherein the front end protection frame comprises a front top plate and a side plate, the rear side surfaces of the front top plate and the side plate are respectively fixed with an arched baffle and a strip baffle, and the rear side of the front end protection frame is fixed with front limiting nails at intervals; a front arc-shaped top plate is also fixed on the rear side surface of the front top plate; the rear end protection frame comprises a rear top plate and side strips, rear limiting nails are fixed on the outer surface of the rear end protection frame at intervals, and a rear arc-shaped top plate is further arranged on the front side of the rear top plate. The tunnel protection structure comprises a front end protection frame, a rear end protection frame, a side protection frame, a front arc-shaped top plate, a rear arc-shaped top plate, a side protection frame and a side protection frame.
Description
Technical Field
The invention belongs to the technical field of construction protection, and particularly relates to a simple assembly type protective structure for steep slope tunnel portal construction.
Background
Tunnels are generally engineered buildings buried within the earth, a form of underground space that is utilized by humans. The definition of a tunnel is therefore: a cavity with a cross section area larger than 2 square meters is built according to a specified shape and size by any method under the ground for a certain purpose. The tunnel portal is used for keeping stability of a tunnel portal elevation slope and a cutting slope; collecting and discharging ground water flow; is convenient for architectural art treatment. With the development of society, to improve the living standard of citizens, the country pays more and more attention to the construction of infrastructure in which roads are constructed as the basic, but the breadth of China is broad, and in places with complex geographic environments, the roads are extremely difficult to construct, and the bridge construction and the tunnel opening cannot be avoided, so that the tunnel construction technology of China is mature.
In the tunnel construction process, after a tunnel body is excavated, the tunnel is easy to deform and collapse along with the release of the stress of surrounding rocks, so that the support needs to be provided by timely primary support for construction, the construction safety is ensured, and a reasonable operation space is provided; the stability and the durability of the existing supporting device adjusting device are poor, meanwhile, the existing supporting device is incomplete in protection and single in function, the protection safety of construction can be influenced, and the existing supporting device is difficult to disassemble and assemble, so that the use efficiency is influenced.
Disclosure of Invention
The invention aims to provide a simple assembly type protective structure for steep slope tunnel entrance construction, which aims to solve the problems in the prior art.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a simple assembly type protective structure for steep slope tunnel portal construction, which comprises a front-end protective frame and a rear-end protective frame, wherein the front-end protective frame and the rear-end protective frame are fixedly connected through two oppositely arranged side protective frames, and a row of supporting strips are fixed on the side protective frames at intervals; the front end protection frame comprises a front top plate, two opposite side plates are clamped at the bottom end of the front top plate, an arched baffle and a strip-shaped baffle are respectively fixed on the rear side surfaces of the front top plate and the side plates, and front limiting nails are fixed on the rear side surfaces of the arched baffle and the strip-shaped baffle at intervals; a front arc-shaped top plate is also fixed on the rear side surface of the front top plate; the rear end protection frame comprises a rear top plate, two oppositely arranged side strips are fixed at the bottom end of the rear top plate, rear limiting nails are fixed on the top of the rear top plate and the opposite outer surfaces of the two side strips at intervals, a supporting plate is arranged on the front side of the rear top plate in a sliding manner, and a rear arc top plate matched with the front arc top plate is fixed on the front side surface of the supporting plate; firstly, excavating a tunnel portal according to a drawing plan of the tunnel portal, arranging a front-end protection frame according to a specific structure of the tunnel portal after excavating, firstly anchoring side plates on two sides of the tunnel portal, and then installing and fixing a front top plate; carry out the support at tunnel entrance to a cave outer top through the arch baffle, carry out the support at top in the tunnel entrance to a cave through the bar baffle, carry out the installation of rear end protection frame, the roof is tentatively fixed at the top in the tunnel earlier, then carry out the support of back roof bottom both sides through the sidebar, carry out the injecing of back roof and sidebar through the spacing nail, ensure the stability of rear end protection frame installation, carry out protective structure's reinforcement through the side protection frame afterwards, cooperation through arc roof and back arc roof, carry out the support of roof structure in the tunnel entrance to a cave, ensure the stability of tunnel entrance to a cave construction, ensure protective structure's dismouting efficiency simultaneously.
Furthermore, both sides of the top of the front top plate are provided with upper anchor holes; lower anchor holes are formed in the two sides of the bottom of the side plate; the upper anchor hole and the lower anchor hole are both suitable for mounting of anchor rods of anchoring structures, and the front-end protection frame is convenient to mount by arranging the upper anchor hole and the lower anchor hole.
Furthermore, clamping grooves are formed in two sides of the bottom end face of the front top plate, clamping strips are fixed on the top end face of the side plate, and the clamping strips are clamped and matched with the clamping grooves; through the cooperation of card strip and draw-in groove, the roof and the curb plate position are fixed before carrying out, ensure the simple and easy assembly of front end protection frame.
Furthermore, the inner tops of the front end protection frame and the rear end protection frame are respectively provided with a limiting locking mechanism, the limiting locking mechanism comprises two oppositely arranged clamping strips, and the two clamping strips are fixedly connected through bolts; the front end protection frame and the rear end protection frame are reinforced through the clamping strips, and the stability of the simple assembly type steep slope tunnel portal construction protection structure is ensured.
Furthermore, the limiting and locking mechanism comprises a middle limiting seat fixed on the lower surfaces of the front top plate and the rear top plate at intervals, and end limiting seats fixed on the tops of the opposite inner side surfaces of the two side plates and the tops of the opposite inner side surfaces of the two side strips, wherein the end limiting seats are flush with the middle limiting seat; the end limiting seats are used for limiting two ends of the holding strip, and the middle limiting seat can be used for reinforcing the front-end protective frame or the rear-end protective frame while ensuring that the holding strip fixes the two side plates.
Furthermore, the middle parts of the opposite inner side surfaces of the two clamping strips are respectively provided with a middle gap matched with the middle limiting seat, and the end parts of the opposite inner side surfaces of the two clamping strips are respectively provided with an end gap matched with the end limiting seat; the middle gap is used for clamping the middle limiting seat, and the end gap is used for clamping the end limiting seat.
Furthermore, the lower surface of the top plate is provided with two oppositely arranged bayonets, the top end of the side strip is fixed with a fixture block, and the fixture block is clamped and matched with the bayonets; the top plate and the side strips are limited through the clamping blocks and the bayonets, and the supporting effect of the side strips on the top plate is ensured.
Furthermore, screws are fixed on the opposite inner side surfaces of the two side plates and the side strips at intervals, nuts are connected to the screws in a threaded mode, the side protection frame well comprises a row of mounting strips arranged at intervals, and two end portions of each mounting strip are sleeved on the peripheral side surface of each screw; through the cooperation of screw rod and nut, carry out the fastening of mounting bar to the installation of side protection frame is carried out, ensures that the side protection frame is to the supporting role that resists of tunnel entrance to a cave inside wall.
Furthermore, a screw rod is rotatably matched in the middle of the rear top plate, a rotary seat is fixed on the rear side surface of the abutting plate, and the rotary seat is rotatably connected with the end part of the screw rod; the rotary seat and the abutting plate are forced to move horizontally by rotating the screw rod, and the supporting effect of the abutting plate on the tunnel portal construction is ensured.
The invention has the following beneficial effects:
1. according to the invention, the tunnel portal is excavated through drawing planning of the tunnel portal, the front-end protection frame is arranged according to the specific structure of the tunnel portal after excavation, the side plates are firstly anchored on two sides of the tunnel portal, and then the front top plate is installed and fixed.
2. The invention supports the outer top of the tunnel portal through the arched baffles, supports the inner top of the tunnel portal through the strip baffles, mounts the rear-end protection frame, preliminarily fixes the rear top plate on the inner top of the tunnel, and supports two sides of the bottom of the rear top plate through the side strips.
3. According to the invention, the rear top plate and the side strips are limited by the limit nails, so that the stability of the installation of the rear end protection frame is ensured, then the protection structure is reinforced by the side protection frame, and the top structure in the tunnel portal is supported by the matching of the arc-shaped top plate and the rear arc-shaped top plate, so that the stability of the tunnel portal construction is ensured, and the installation efficiency of the protection structure is ensured.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a simply assembled protective structure for steep tunnel entrance construction of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic structural view of a front protection frame;
FIG. 5 is a schematic structural view of the front top plate;
FIG. 6 is a schematic structural view of a side plate;
FIG. 7 is a schematic structural view of a rear protection frame;
FIG. 8 is a schematic structural view of the rear top plate;
FIG. 9 is a schematic structural view of a side bar;
FIG. 10 is a schematic view of the structure of the gib;
fig. 11 is a schematic structural view of a side protection frame.
In the drawings, the components represented by the respective reference numerals are listed below:
1-front end protection frame, 2-rear end protection frame, 3-clamping strip, 4-middle limiting seat, 5-end limiting seat, 6-screw rod, 7-side protection frame, 101-front top plate, 102-side plate, 103-arched baffle, 104-strip baffle, 105-front limiting nail, 106-front arched top plate, 201-rear top plate, 202-side strip, 203-rear limiting nail, 204-resisting plate, 205-rear arched top plate, 301-middle notch, 302-end notch, 701-resisting strip, 702-mounting strip, 1011-upper anchor hole, 1012-clamping groove, 1021-lower anchor hole, 1022-clamping strip, 2011-clamping opening, 2021-clamping block, 2013-screw rod and 2041-rotating seat.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-11, the present invention is a protection structure for a simple assembly type steep tunnel portal construction, including a front protection frame 1 and a rear protection frame 2, the front protection frame 1 and the rear protection frame 2 are fixedly connected by two oppositely disposed side protection frames 7, and a row of supporting bars 701 is fixed on the side protection frames 7 at intervals; the front-end protection frame 1 comprises a front top plate 101, two opposite side plates 102 are clamped at the bottom end of the front top plate 101, an arched baffle plate 103 and a strip baffle plate 104 are respectively fixed on the rear side surfaces of the front top plate 101 and the side plates 102, and front limit nails 105 are respectively fixed on the rear side surfaces of the arched baffle plate 103 and the strip baffle plate 104 at intervals; a front arc-shaped top plate 106 is also fixed on the rear side surface of the front top plate 101; the rear end protection frame 2 comprises a rear top plate 201, two oppositely arranged side strips 202 are fixed at the bottom end of the rear top plate 201, rear limiting nails 203 are fixed on the top of the rear top plate 201 and the opposite outer surfaces of the two side strips 202 at intervals, a resisting plate 204 is slidably arranged on the front side of the rear top plate 201, and a rear arc top plate 205 matched with the front arc top plate 106 is fixed on the front side surface of the resisting plate 204; firstly, excavating a tunnel portal according to a drawing plan of the tunnel portal, arranging a front-end protection frame 1 according to a specific structure of the tunnel portal after excavating, firstly anchoring side plates 102 at two sides of the tunnel portal, and then installing and fixing a front top plate 101; carry out the support at tunnel entrance to a cave outer top through arch baffle 103, carry out the support at top in the tunnel entrance to a cave through bar baffle 104, carry out the installation of rear end protection frame 2, top in the tunnel is tentatively fixed with back roof 201 earlier, then carry out the support of back roof 201 bottom both sides through sidebar 202, carry out the injecing of back roof 201 and sidebar 202 through spacing nail 203, ensure the stability of rear end protection frame 2 installation, carry out protective structure's reinforcement through side protection frame 7 afterwards, cooperation through arc roof 106 and back arc roof 205, carry out the support of roof structure in the tunnel entrance to a cave, ensure the stability of tunnel entrance to a cave construction.
Both sides of the top of the front top plate 101 are provided with upper anchor holes 1011; both sides of the bottom of the side plate 102 are provided with lower anchor holes 1021; go up anchor eye 1011 and anchor eye 1021 and all be applicable to the installation of anchor structure stock down, through being equipped with anchor eye 1011 and anchor eye 1021 down, the installation of front end protection frame 1 of being convenient for.
Clamping grooves 1012 are formed in the two sides of the bottom end face of the front top plate 101, clamping strips 1022 are fixed to the top end face of the side plate 102, and the clamping strips 1022 are in clamping fit with the clamping grooves 1012; the positions of the front top plate 101 and the side plate 102 are fixed by the engagement of the locking strip 1022 and the locking groove 1012, thereby ensuring easy assembly of the front protection frame 1.
The top parts of the front end protection frame 1 and the rear end protection frame 2 are respectively provided with a limiting locking mechanism, the limiting locking mechanism comprises two oppositely arranged clamping strips 3, and the two clamping strips 3 are fixedly connected through bolts; the front end protection frame 1 and the rear end protection frame 2 are installed and reinforced through the clamping strips 3, and the stability of the simple assembly type steep slope tunnel portal construction protection structure is ensured.
The limiting and locking mechanism comprises a middle limiting seat 4 fixed on the lower surfaces of the front top plate 101 and the rear top plate 201 at intervals, and end limiting seats 5 fixed on the tops of the opposite inner side surfaces of the two side plates 102 and the tops of the opposite inner side surfaces of the two side strips 202, wherein the end limiting seats 5 are flush with the middle limiting seat 4; the end limiting seats 5 are used for limiting two ends of the holding strip 3, and the middle limiting seat 4 ensures that the holding strip 3 can fix the two side plates 102 and can also reinforce the front-end protection frame 1 or the rear-end protection frame 2.
The middle parts of the opposite inner side surfaces of the two holding strips 3 are respectively provided with a middle gap 301 matched with the middle limiting seat 4, and the end parts of the opposite inner side surfaces of the two holding strips 3 are respectively provided with an end gap 302 matched with the end limiting seat 5; the middle gap 301 is used for clamping the middle limiting seat 4, and the end gap 302 is used for clamping the end limiting seat 5.
The lower surface of the top plate 201 is provided with two oppositely arranged bayonets 2011, the top end of the side bar 202 is fixed with a fixture block 2021, and the fixture block 2021 is clamped and matched with the bayonets 2011; the fixture blocks 2021 and the bayonets 2011 define the top plate 201 and the side bars 202, so that the supporting effect of the side bars 202 on the top plate 201 is ensured.
The opposite inner side surfaces of the two side plates 102 and the side strips 202 are respectively fixed with a screw 6 at intervals, the screw 6 is in threaded connection with a nut, the side protection frame 7 preferably comprises a row of mounting strips 702 arranged at intervals, and two end parts of the mounting strips 702 are respectively sleeved on the peripheral side surface of the screw 6; through the cooperation of screw rod 6 with the nut, carry out the fastening of mounting bar 702 to the installation of side protection frame 7 is carried out, the support effect that resists of side protection frame 7 to tunnel entrance to a cave inside wall is ensured.
A screw rod 2013 is rotatably matched with the middle part of the rear top plate 201, a rotary seat 2041 is fixed on the rear side surface of the abutting plate 204, and the rotary seat 2041 is rotatably connected with the end part of the screw rod 2013; the screw rod 2013 is rotated to force the rotating seat 2041 and the abutting plate 204 to move horizontally, so that the supporting effect of the abutting plate 204 on tunnel portal construction is ensured.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. The utility model provides a protective structure is used in construction of simple and easy assembled abrupt slope tunnel entrance to a cave, includes front end protection frame (1) and rear end protection frame (2), its characterized in that:
the front end protection frame (1) and the rear end protection frame (2) are fixedly connected through two oppositely arranged side protection frames (7), and a row of supporting strips (701) are fixed on the side protection frames (7) at intervals;
the front-end protection frame (1) comprises a front top plate (101), two opposite side plates (102) are clamped at the bottom end of the front top plate (101), an arched baffle plate (103) and a strip-shaped baffle plate (104) are respectively fixed on the rear side surfaces of the front top plate (101) and the side plates (102), and front limiting nails (105) are respectively fixed on the rear side surfaces of the arched baffle plate (103) and the strip-shaped baffle plate (104) at intervals;
a front arc-shaped top plate (106) is further fixed on the rear side surface of the front top plate (101);
rear end protection frame (2) are including back roof (201), back roof (201) bottom mounting has two lateral strips (202) to setting up, back roof (201) top and the relative surface of two lateral strips (202) are all fixed with back spacing nail (203) at the interval, it is provided with and supports board (204) to slide on back roof (201) front side, support board (204) front side be fixed with back arc roof (205) of preceding arc roof (106) adaptation.
2. The protective structure for the construction of the simple assembling type steep slope tunnel portal according to claim 1, characterized in that both sides of the top of the front top plate (101) are provided with upper anchor holes (1011); both sides of the bottom of the side plate (102) are provided with lower anchor holes (1021), and the lower anchor holes (1021) have the same structural characteristics as the upper anchor holes (1011).
3. The protective structure for the construction of the simple assembling type steep tunnel portal according to claim 1, wherein the front top plate (101) is provided with clamping grooves (1012) on both sides of the bottom end surface, the side plate (102) is fixed with clamping strips (1022) on the top end surface, and the clamping strips (1022) are in clamping fit with the clamping grooves (1012).
4. The protective structure for the construction of the simple assembling type steep slope tunnel portal according to claim 1, characterized in that the inner tops of the front end protective frame (1) and the rear end protective frame (2) are respectively provided with a limiting locking mechanism, the limiting locking mechanism comprises two oppositely arranged holding strips (3), and the two holding strips (3) are fixedly connected through bolts.
5. The protective structure for the construction of the simple assembling type steep tunnel portal according to claim 4, wherein the limiting and locking mechanism comprises a middle limiting seat (4) fixed on the lower surfaces of the front top plate (101) and the rear top plate (201) at intervals, and end limiting seats (5) fixed on the tops of the opposite inner side surfaces of the two side plates (102) and the tops of the opposite inner side surfaces of the two side strips (202), wherein the end limiting seats (5) are flush with the middle limiting seat (4).
6. The protective structure for the construction of the simple assembling type steep tunnel portal according to claim 5, wherein the middle parts of the opposite inner side surfaces of the two holding strips (3) are provided with middle notches (301) matched with the middle limiting seats (4), and the end parts of the opposite inner side surfaces of the two holding strips (3) are provided with end notches (302) matched with the end limiting seats (5).
7. The protective structure for the construction of the simple assembling type steep slope tunnel portal according to claim 1, wherein the lower surface of the top plate (201) is provided with two oppositely arranged bayonets (2011), the top end of the side bar (202) is fixed with a fixture block (2021), and the fixture block (2021) is in clamping fit with the bayonets (2011).
8. The protective structure for the construction of the simple assembling type steep tunnel portal according to claim 1, wherein two opposite inner side surfaces of the side plates (102) and the side bars (202) are fixed with screws (6) at intervals, the screws (6) are in threaded connection with nuts, the side protective frame (7) preferably comprises a row of mounting bars (702) arranged at intervals, and two end parts of the mounting bars (702) are sleeved on the peripheral side surfaces of the screws (6).
9. The protective structure for the construction of the simple assembling type steep tunnel portal according to claim 1, wherein a screw rod (2013) is rotatably fitted in the middle of the rear top plate (201), a rotary seat (2041) is fixed on the rear side surface of the resisting plate (204), and the rotary seat (2041) is rotatably connected with the end of the screw rod (2013).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110678311.3A CN113217013A (en) | 2021-06-18 | 2021-06-18 | Protective structure is used in construction of simple and easy assembled abrupt slope tunnel entrance to a cave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110678311.3A CN113217013A (en) | 2021-06-18 | 2021-06-18 | Protective structure is used in construction of simple and easy assembled abrupt slope tunnel entrance to a cave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113217013A true CN113217013A (en) | 2021-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110678311.3A Withdrawn CN113217013A (en) | 2021-06-18 | 2021-06-18 | Protective structure is used in construction of simple and easy assembled abrupt slope tunnel entrance to a cave |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113217013A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320339A (en) * | 2021-12-20 | 2022-04-12 | 攀钢集团工程技术有限公司 | Buffering damping device for preventing blasting damage of tunnel portal |
-
2021
- 2021-06-18 CN CN202110678311.3A patent/CN113217013A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320339A (en) * | 2021-12-20 | 2022-04-12 | 攀钢集团工程技术有限公司 | Buffering damping device for preventing blasting damage of tunnel portal |
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Application publication date: 20210806 |