CN112392510A - Tunnel secondary lining and cable trough integrated forming device and method - Google Patents
Tunnel secondary lining and cable trough integrated forming device and method Download PDFInfo
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- CN112392510A CN112392510A CN202011262527.3A CN202011262527A CN112392510A CN 112392510 A CN112392510 A CN 112392510A CN 202011262527 A CN202011262527 A CN 202011262527A CN 112392510 A CN112392510 A CN 112392510A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 238000009415 formwork Methods 0.000 claims description 36
- 238000010276 construction Methods 0.000 abstract description 36
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003351 stiffener Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/04—Distributing means for power supply in mines
- E21F17/06—Distributing electric power; Cable networks; Conduits for cables
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Power Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a device and a method for integrally forming a tunnel secondary lining and a cable duct, belongs to the field of tunnel construction, and aims to improve the overall strength and the appearance line type of the cable duct and improve the construction efficiency. The feet at the two sides of the secondary lining arch part template are respectively hinged with a cable trough template; the outer peripheral surface of the secondary lining arch part template is butted with the outer peripheral surface of the cable trough template and surrounds the cable trough template to form a pouring surface with the secondary lining and the cable trough inner side wall body integrally formed; and a telescopic supporting rod is arranged between the cable trough template and the secondary lining trolley. The invention reduces the consumption of the template, is beneficial to improving the construction speed and saving the construction period; because the secondary lining and the wall body on the inner side of the cable duct are formed by one-time pouring, no construction joint exists between the secondary lining and the wall body, the integrity is good, and the continuity of the cable duct and the quality of the outer pipe are improved. Through the one-time pouring molding of secondary lining and the wall body in the cable duct, different working procedures are combined, and the construction working procedures are reduced.
Description
Technical Field
The invention belongs to the field of tunnel construction, and particularly relates to a device and a method for integrally forming a tunnel secondary lining and a cable duct.
Background
The inconvenient approach of the mechanical equipment for tunnel construction in the complex mountainous area is one of the important reasons for the construction difficulty and the outstanding problems of the tunnel in the complex mountainous area. The comprehensive consideration uses large-scale novel shield structure machine not to conform to reality, uses the problem that traditional technology efficiency of construction is low, need improve current construction technology and carry out reasonable optimization to the development of adaptation tunnel to the construction process. The cable duct in tunnel belongs to the affiliated engineering in tunnel, is the last process of tunnel construction usually, just organizes the construction in the middle and later stage of tunnel construction, and the ubiquitous work volume is big, time limit for a project scheduling problem. Traditional cable duct construction mode, after tunnel secondary lining construction is accomplished, adopt small-size steel form combination to carry out the cable duct construction again, and construct cable duct bed bottom concrete earlier usually, then construct cable duct wall body concrete again. Traditional cable duct construction method has following drawback:
1. after the secondary lining pouring is finished, construction is carried out, and the construction period is short;
2. the construction joints in the tunnel are many, the overall strength of the cable trough is poor, the line type is not straight, and the surface evenness of the concrete is poor.
Disclosure of Invention
The invention aims to provide a device and a method for integrally forming a tunnel secondary lining and a cable duct, which can improve the overall strength and the appearance line type of the cable duct and improve the construction efficiency.
The technical scheme adopted by the invention is as follows: the tunnel secondary lining and cable duct integrated forming device comprises a secondary lining trolley, wherein the secondary lining trolley comprises a trolley body and a secondary lining arch template which is supported on the trolley body and corresponds to a tunnel arch; the feet at the two sides of the secondary lining arch part template are respectively provided with a cable groove template; the top end of the cable trough template is hinged with the foot part of the secondary lining arch template; the outer peripheral surface of the secondary lining arch part template is butted with the outer peripheral surface of the cable trough template and surrounds the cable trough template to form a pouring surface with the secondary lining and the cable trough inner side wall body integrally formed; and a telescopic supporting rod is arranged between the cable trough template and the secondary lining trolley, one end of the telescopic supporting rod is hinged with the back surface of the cable trough template, and the other end of the telescopic supporting rod is hinged with the secondary lining trolley.
Further, the cable duct template is including forming the panel of pouring the face, the panel is including encircleing wall linking section, cable duct top wall section and cable duct wall section, cable duct top wall section one end is connected with the bottom that encircles the wall linking section, and the other end level is inwards extended and is connected with the top of the cable duct wall section of vertical setting.
Furthermore, vertical stiffening plates are respectively arranged at two ends of the panel along the longitudinal direction of the panel, and the vertical stiffening plates extend from the top end to the bottom end of the panel along the vertical direction of the panel; and a group of longitudinal stiffening ribs are arranged on the panel along the vertical direction of the panel, and the longitudinal stiffening ribs longitudinally extend from the vertical stiffening plate at the front end of the panel to the vertical stiffening plate at the rear end of the panel along the vertical direction of the panel.
Furthermore, the telescopic supporting rods comprise radial supporting rods and vertical supporting rods; and the vertical support rods are arranged at two ends of the cable groove template longitudinally along the tunnel, the radial support rods are arranged at the middle part of the cable groove template, and the inclination of the vertical support rods relative to the horizontal plane is greater than that of the radial support rods relative to the horizontal plane.
The method for integrally forming the secondary lining of the tunnel and the cable duct comprises the following steps of 1, positioning a secondary lining trolley, and respectively hinging feet at two sides of a secondary lining arch template with cable duct templates;
and 3, pouring concrete into the pouring cavity to form an inner side wall body of the secondary lining and the cable trough.
Further, the secondary lining arch formwork comprises a vault formwork and side formworks at two sides along the annular direction of the secondary lining arch formwork; the vault template is hinged with the side template; the vault formwork is provided with a pouring window which radially penetrates through the vault formwork, and the side formwork is also provided with a pouring window which radially penetrates through the side formwork.
Further, in the step 3, concrete is poured into the pouring cavity from the windows to the pouring cavity one by one from bottom to top along the vertical direction.
Further, before step 1, a cable slot template is manufactured: sequentially connecting the arch wall connecting section, the cable trough top wall section and the cable trough wall section; then, respectively fixing a vertical stiffening plate at the front end and the rear end of the panel along the longitudinal direction, fixing a longitudinal stiffening rib at least at the top of the panel along the vertical direction, and respectively fixedly connecting the two ends of the longitudinal stiffening rib with the corresponding vertical stiffening plates; finally, a hinged support is fixedly connected to the longitudinal stiffening rib at the top of the panel.
Further, a longitudinal stiffening rib is fixed in the middle of the panel along the vertical direction, one end of the radial support rod is hinged with the longitudinal stiffening rib, and the other end of the radial support rod is hinged to the trolley body of the secondary lining trolley inwards in the radial direction; one end of the vertical supporting rod is hinged with the vertical stiffening plate, and the other end of the vertical supporting rod extends inwards and upwards and is hinged with the secondary lining trolley.
The invention has the beneficial effects that: according to the invention, the cable trough template is hinged with the foot part of the secondary lining arch template to form the secondary lining and one-time pouring template of the wall body at the inner side of the cable trough, so that the template consumption is reduced, the construction speed is favorably improved, and the construction period is saved; because the secondary lining and the wall body on the inner side of the cable duct are formed by one-time pouring, no construction joint exists between the secondary lining and the wall body, the integrity is good, and the continuity of the cable duct and the quality of the outer pipe are improved. Through the one-time pouring molding of secondary lining and the wall body in the cable duct, different working procedures are combined, and the construction working procedures are reduced.
Drawings
FIG. 1 is a front view of a tunnel secondary lining and cable trough integrated forming device;
FIG. 2 is a schematic drawing of pouring of the tunnel secondary lining and cable trough integrated forming device;
FIG. 3 is a schematic structural diagram of a cable trough template;
fig. 4 is a schematic diagram of splicing a cable trough template and a secondary lining arch template.
In the figure, a trolley body 1, a secondary lining arch formwork 2, a vault formwork 21, a side formwork 22, a pouring window 23, a cable trough formwork 3, a panel 31, an arch wall connecting section 311, a cable trough top wall section 312, a cable trough wall section 313, a vertical stiffening plate 32, a longitudinal stiffening rib 33, a hinged support 34, a telescopic support rod 4, a radial support rod 41, a vertical support rod 42, a secondary lining 5, a cable trough 6 and an inner side wall body 61.
Detailed Description
The invention is further described below with reference to the following figures and examples:
the tunnel secondary lining and cable duct integrated forming device comprises a secondary lining trolley as shown in figure 1 or figure 2, wherein the secondary lining trolley comprises a trolley body 1 and a secondary lining arch part template 2 which is supported on the trolley body 1 and corresponds to a tunnel arch part; the feet at the two sides of the secondary lining arch part template 2 are respectively provided with a cable trough template 3; the top end of the cable trough template 3 is hinged with the foot part of the secondary lining arch template 2; the outer peripheral surface of the secondary lining arch part template 2 is butted with the outer peripheral surface of the cable trough template 3 and surrounds to form a pouring surface of the secondary lining and the wall body at the inner side of the cable trough which are integrally formed; be provided with flexible bracing piece 4 between cable duct template 3 and secondary lining platform truck, 4 one end of flexible bracing piece is articulated with the back of cable duct template 3, and the other end is articulated with the secondary lining platform truck.
The invention discloses a tunnel secondary lining and cable duct integrated forming device, which is characterized in that a secondary lining trolley adopts a conventional structure and comprises a trolley body 1 consisting of a travelling mechanism and a portal assembly, an electric appliance operation control system, a hydraulic system and a secondary lining arch template 2. The walking mechanism can be composed of four walking trolleys, two driving wheel trolleys and two driven wheel trolleys, and an operator operates a power switch to move the secondary lining trolley. The portal assembly can be composed of six portals.
As is well known, the tunnel secondary lining comprises an arch wall and side walls on two sides of the arch along the circumferential direction, in the invention, a secondary lining arch formwork 2 is used for forming the tunnel secondary lining arch wall, a cable trough formwork 3 is used for forming the tunnel secondary lining side wall and forming an inner side wall body 61 of a cable trough 6, and the outer circumferential surfaces of the cable trough formwork 3 and the secondary lining arch formwork 2 are butted to form a pouring surface, so that the secondary lining side wall and the inner side wall body 61 of the cable trough 6 are integrally formed, the integrity of the inner side wall body 61 of the cable trough 6 and the secondary lining is increased, the same construction joint and the same deformation joint with the secondary lining are formed, the continuity is improved, and the appearance quality defect of a spliced formwork bag cage in later construction is reduced; and the cable groove 6 is reduced
The construction period that the later stage is under construction alone increases, with the once only construction operation of secondary lining, the construction process is simpler, does benefit to the secondary lining template, need not independent formwork erection, support alone and pour alone promptly, the people that has significantly reduced, material, machine consumption improve the efficiency of construction, reduction of erection time.
In order to be able to adapt to the dual requirements of the secondary lining side wall and the wall body 61 inside the cable trough 6, it is preferable that, as shown in fig. 3 and 4, the cable trough formwork 3 includes a panel 31 forming a casting surface, the panel 31 includes an arch wall engaging section 311, a cable trough top wall section 312 and a cable trough wall section 313, one end of the cable trough top wall section 312 is connected with the bottom end of the arch wall engaging section 311, and the other end extends horizontally inwards and is connected with the top end of the vertically arranged cable trough wall section 313.
The arch wall engaging section 311, the cable trough top wall section 312 and the cable trough wall section 313 may be separate steel plates, spliced to form the panel 31. The arch wall engaging section 311, the cable trough top wall section 312 and the cable trough wall section 313 may also be formed by bending a single steel plate.
According to the invention, when the inner side wall body 61 of the cable trough 6 and the secondary lining are poured simultaneously, the position of the inner side wall body 61 of the cable trough 6 is the bottommost part of the secondary lining, the pressure borne by the cable trough template 3 is large during pouring, the risk of deformation of the panel 31 due to extrusion is high, in order to improve the strength of the panel 31, preferably, the vertical stiffening plates 32 are respectively arranged at two ends of the panel 31 along the longitudinal direction of the panel 31, and the vertical stiffening plates 32 extend from the top end to the bottom end of the panel 31 along the vertical direction of the panel 31; a set of longitudinal stiffeners 33 is arranged on the panel 31 along the vertical direction of the panel 31, and the longitudinal stiffeners 33 longitudinally extend from the vertical stiffeners 32 at the front end of the panel 31 to the vertical stiffeners 32 at the rear end of the panel 31.
In order to transmit the pressure of the concrete on the cable trough formwork 3 during pouring to the secondary lining trolley, preferably, the telescopic supporting rods 4 comprise radial supporting rods 41 and vertical supporting rods 42; along the tunnel is vertical, vertical support rod 42 sets up in the both ends of cable duct template 3, and radial support rod 41 sets up in the middle part of cable duct template 3, and vertical support rod 42 is greater than the gradient of radial support rod 41 for the horizontal plane for the gradient of horizontal plane. In the structure, the pressure of the concrete on the cable trough formworks 3 is transmitted to the secondary lining trolley through the radial support rods 41 and the vertical support rods 42, and the concrete pressure transmitted by the cable trough formworks 3 on two sides is borne by the secondary lining trolley.
A method for integrally forming a tunnel secondary lining and a cable trough,
step 1, positioning a secondary lining trolley, and respectively hinging feet at two sides of a secondary lining arch part template 2 with cable trough templates 3;
and 3, pouring concrete into the pouring cavity to form the secondary lining 5 and the inner side wall body 61 of the cable trough 6.
According to the method for integrally forming the secondary lining of the tunnel and the cable duct, the secondary lining of the tunnel and the wall body 61 on the inner side of the cable duct are integrally formed, so that the working procedures are reduced, the construction period is favorably shortened, and the cost is saved. In addition, the secondary lining side wall and the wall body 61 inside the cable trough are integrated, no construction joint exists between the secondary lining side wall and the wall body, the secondary lining side wall and the wall body are mutually reinforced, and the continuity and the appearance quality of the cable trough 6 are improved.
The secondary lining arch part formwork 2 is one of the decisive factors of the surface quality of the concrete, and in order to improve the surface quality of the concrete, preferably, the secondary lining arch part formwork 2 comprises a vault formwork 21 and side formworks 22 at two sides along the annular direction; the vault template 21 is hinged with the side template 22; the arch form 21 is provided with a casting window 23 which radially penetrates through the arch form 21, and the side form 22 is also provided with a casting window 23 which radially penetrates through the side form 22.
The vault template 21 is hinged with the side template 22, so that the side template 22 can rotate around the hinge, the expansion and contraction of the template can be adjusted conveniently, and the requirement on the size of the section of the secondary lining is met.
In the step 3, concrete is poured into the pouring cavity from the window 23 to the pouring cavity one by one along the vertical direction.
After pouring is completed, the formwork can be disassembled after the concrete strength reaches 5.0MPa, the end formwork is firstly disassembled during formwork disassembly, then the supporting stay bar between the trolley body 1 and the secondary lining arch part formwork 2 is contracted, and the principle that the two sides are synchronous is adopted when the stay bar is contracted according to the principle that the two sides are synchronous from top to bottom. When the cable trough formwork 3 is demolded, the radial support rods 41 are retracted firstly, then the cable trough formwork 3 is lifted by utilizing the inner upper side of the vertical support rod 42, after the formworks are completely retracted and separated from the concrete surface, the trolley traveling system is opened, the secondary lining trolley is pushed away, and pouring is completed.
Before step 1, a cable trough template 3 is manufactured: connecting the arch wall connecting section 311, the cable trough top wall section 312 and the cable trough wall section 313 in sequence; then, a vertical stiffening plate 32 is respectively fixed at the front end and the rear end of the panel 31 along the longitudinal direction, a longitudinal stiffening rib 33 is fixed at least at the top of the panel 31 along the vertical direction, and the two ends of the longitudinal stiffening rib 33 are respectively fixedly connected with the corresponding vertical stiffening plates 32; finally, hinged supports 34 are fixedly attached to the longitudinal stiffeners 33 at the top of the panel 31. A longitudinal stiffening rib 33 is vertically fixed in the middle of the panel 31, one end of a radial support rod 41 is hinged with the longitudinal stiffening rib 33, and the other end is hinged to the trolley body 1 of the secondary lining trolley inwards in the radial direction; one end of the vertical support rod 42 is hinged with the vertical stiffening plate 32, and the other end extends inwards and upwards and is hinged with the secondary lining trolley. The longitudinal stiffeners 33 serve not only to reinforce the panel 31, but also to mount the hinged supports 34 and the radial struts 41. The vertical stiffener plates 32 are used not only to reinforce the panel 31 but also to mount the vertical support rods 42.
Claims (9)
1. The tunnel secondary lining and cable duct integrated forming device comprises a secondary lining trolley, wherein the secondary lining trolley comprises a trolley body (1) and a secondary lining arch template (2) which is supported on the trolley body (1) and corresponds to a tunnel arch; the method is characterized in that: the feet at the two sides of the secondary lining arch part template (2) are respectively provided with a cable trough template (3); the top end of the cable trough template (3) is hinged with the foot part of the secondary lining arch template (2); the outer peripheral surface of the secondary lining arch part template (2) is butted with the outer peripheral surface of the cable trough template (3) and surrounds to form a pouring surface of the secondary lining (5) and the inner side wall body (61) of the cable trough (6) which are integrally formed; and a telescopic support rod (4) is arranged between the cable trough template (3) and the secondary lining trolley, one end of the telescopic support rod (4) is hinged with the back surface of the cable trough template (3), and the other end of the telescopic support rod is hinged with the secondary lining trolley.
2. The tunnel secondary lining and cable trough integrated into one piece device of claim 1, wherein: the cable trough template (3) is including forming panel (31) of pouring the face, panel (31) are including encircleing wall linking section (311), cable trough top wall section (312) and cable trough wall section (313), cable trough top wall section (312) one end is connected with the bottom of encircleing wall linking section (311), and the other end level is inwards extended and is connected with the top of the cable trough wall section (313) of vertical setting.
3. The tunnel secondary lining and cable trough integrated into one piece device of claim 2, wherein: vertical stiffening plates (32) are respectively arranged at two ends of the panel (31) along the longitudinal direction of the panel (31), and the vertical stiffening plates (32) vertically extend from the top end to the bottom end of the panel (31) along the panel (31); the vertical stiffening rib structure is characterized in that a group of longitudinal stiffening ribs (33) are arranged on the panel (31) along the vertical direction of the panel (31), and the longitudinal stiffening ribs (33) longitudinally extend from the vertical stiffening plate (32) at the front end of the panel (31) to the vertical stiffening plate (32) at the rear end along the panel (31).
4. The tunnel secondary lining and cable trough integral forming device of any one of claims 1 to 3, wherein: the telescopic supporting rod (4) comprises a radial supporting rod (41) and a vertical supporting rod (42); the vertical support rods (42) are arranged at two ends of the cable groove template (3) along the longitudinal direction of the tunnel, the radial support rods (41) are arranged in the middle of the cable groove template (3), and the inclination of the vertical support rods (42) relative to the horizontal plane is larger than that of the radial support rods (41) relative to the horizontal plane.
5. The molding method using the tunnel secondary lining and cable trough integrated molding device of any one of claims 1 to 3, characterized in that:
step 1, positioning a secondary lining trolley, and respectively hinging feet at two sides of a secondary lining arch part template (2) with cable trough templates (3);
step 2, the cable trough template (3) and the secondary lining arch template (2) stretch in place, the end template is blocked, and a pouring cavity is formed by the cable trough template (3), the secondary lining arch template (2) and the primary tunnel support;
and 3, pouring concrete into the pouring cavity to form a secondary lining (5) and an inner side wall body (61) of the cable trough (6).
6. The method of claim 5, wherein the tunnel secondary lining is integrally formed with the cable trough, and the method comprises the following steps: the secondary lining arch part formwork (2) comprises an arch top formwork (21) and side formworks (22) on two sides along the circumferential direction; the vault template (21) is hinged with the side template (22); the vault template (21) is provided with a pouring window (23) which radially penetrates through the vault template (21), and the side template (22) is also provided with a pouring window (23) which radially penetrates through the side template (22).
7. The method of claim 6, wherein the tunnel secondary lining is integrally formed with the cable trough, and the method comprises the following steps: in the step 3, the windows (23) are poured one by one along the vertical direction into the pouring cavity.
8. The method of claim 7, wherein the tunnel secondary lining is integrally formed with the cable trough, and the method comprises the following steps: before the step 1, a cable groove template (3) is manufactured: connecting the arch wall connecting section (311), the cable trough top wall section (312) and the cable trough wall section (313) in sequence; then, a vertical stiffening plate (32) is respectively fixed at the front end and the rear end of the panel (31) along the longitudinal direction, a longitudinal stiffening rib (33) is fixed at least at the top of the panel (31) along the vertical direction, and the two ends of the longitudinal stiffening rib (33) are respectively fixedly connected with the corresponding vertical stiffening plate (32); finally, a hinged support (34) is fixedly connected to the longitudinal stiffening rib (33) at the top of the panel (31).
9. The method of claim 8, wherein the tunnel secondary lining is integrally formed with the cable trough, and further comprising: a longitudinal stiffening rib (33) is vertically fixed in the middle of the panel (31), one end of a radial support rod (41) is hinged with the longitudinal stiffening rib (33), and the other end is hinged to a trolley body (1) of the secondary lining trolley inwards in the radial direction; one end of the vertical supporting rod (42) is hinged with the vertical stiffening plate (32), and the other end extends inwards and upwards and is hinged with the secondary lining trolley.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262527.3A CN112392510A (en) | 2020-11-12 | 2020-11-12 | Tunnel secondary lining and cable trough integrated forming device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262527.3A CN112392510A (en) | 2020-11-12 | 2020-11-12 | Tunnel secondary lining and cable trough integrated forming device and method |
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| CN112392510A true CN112392510A (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011262527.3A Pending CN112392510A (en) | 2020-11-12 | 2020-11-12 | Tunnel secondary lining and cable trough integrated forming device and method |
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Application publication date: 20210223 |