Prefabricated assembly type supporting device for drilling and blasting method tunnel construction and construction method

Abstract

The invention relates to the technical field of underground engineering, in particular to a prefabricated assembly type supporting device for drilling and blasting method tunnel construction and a construction method.The prefabricated assembly type supporting device comprises a supporting frame, the upper portion of the supporting frame abuts against the inner wall of the underground engineering in a matched mode, and the lower portion of the supporting frame is evenly connected with a plurality of assembly prefabricated slab structures connected end to end; and each assembled precast slab structure is connected with more than one anchor rod structure which is anchored in an underground engineering soil layer. According to the prefabricated assembly type supporting device for drilling and blasting method tunnel construction and the construction method, the supporting device is composed of the supporting frame and the multiple prefabricated assembly prefabricated slab structures, the number of the assembly prefabricated slab structures and the supporting frames of different lengths can be selected according to actual needs, and therefore rapid assembly of the supporting devices of different sizes is completed; a supporting device does not need to be manufactured on site during construction, and construction efficiency of underground engineering is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering, and more particularly to a prefabricated assembled support device for tunnel construction using a drill-and-blast method and a construction method thereof. Background Art

[0002] An underground tunnel is a man-made underground passageway connecting two locations and providing access for people, vehicles, or supplies. Underground tunnels are commonly used in urban transportation, subways, transportation hubs, water supply, drainage, electricity, and communications. Their construction and operation have a significant impact on the development of urban transportation and infrastructure. They can improve urban accessibility and traffic efficiency, and reduce road congestion. However, tunnel construction and operation also face challenges, such as high project costs, complex geological conditions, and construction difficulties. Therefore, comprehensive assessment and scientific management are necessary when planning and implementing underground tunnel projects. During tunnel construction, tunnel retaining wall support structures are used. Tunnel retaining wall support structures are structural systems used to support and protect the tunnel sidewalls. In tunnel construction, appropriate retaining wall support structures are essential to prevent sidewall collapse and maintain tunnel stability and safety. Because the upper end of a tunnel is an arched structure, the radius of the arch varies for tunnels of different sizes. This requires different support structures of different sizes to support the tunnel. This necessitates the on-site construction of different support structures during tunnel construction, making construction cumbersome and resulting in low adaptability of the support structures. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a prefabricated assembled support device and a construction method for tunnel construction using a drill and blast method.

[0004] The technical solution adopted in the present invention is:

[0005] A prefabricated assembled support device for tunnel construction using the drill-and-blast method comprises a support frame, the upper portion of which abuts against the inner wall of an underground project, and the lower portion of which is evenly connected to a plurality of assembled prefabricated panel structures connected end to end; each assembled prefabricated panel structure is connected to one or more anchor rod structures for anchoring in the soil layer of the underground project.

[0006] Furthermore, the support frame is an arc-shaped structure, and two support frames are provided, and the front and rear ends of the upper surface of the multiple assembled prefabricated panel structures are respectively connected to a support frame.

[0007] Furthermore, the prefabricated assembled support device for tunnel construction using the drill and blast method also includes: a grouting front baffle, a grouting rear baffle, a grouting left baffle and a grouting right baffle; the front and rear ends of each assembled prefabricated panel structure are respectively connected to a grouting front baffle and a grouting rear baffle; the front side of a support frame is connected to multiple grouting front baffles connected end to end, and the rear side of another support frame is connected to multiple grouting rear baffles connected end to end; the assembled prefabricated panel structure, the grouting front baffle, and the grouting rear baffle located at the left end are connected to the grouting left baffle, and the assembled prefabricated panel structure, the grouting front baffle, and the grouting rear baffle located at the right end are connected to the grouting right baffle, and a grouting trough with an open top is formed between the multiple grouting front baffles, the multiple grouting rear baffles, the multiple assembled prefabricated panel structures, the grouting left baffle and the grouting right baffle.

[0008] Furthermore, the anchor rod structure includes: an anchor pipe with a grouting channel provided therein, and a plurality of grouting holes communicated with the grouting channel are provided on the side wall of the pipe body of the anchor pipe inserted into the grouting groove.

[0009] Furthermore, the assembled precast panel structure includes: a concrete precast panel with an arc-shaped structure, one end of the concrete precast panel is provided with a semi-cylindrical protrusion, the other end of the concrete precast panel is provided with a semi-cylindrical groove, and the semi-cylindrical protrusion and the semi-cylindrical groove of two adjacent concrete precast panels are chiseled and connected; a plurality of studs are provided on the top of each concrete precast panel, the plurality of studs are passed through the through holes of the arc-shaped reinforcing steel plate, and the assembly nuts threaded above the plurality of studs are clamped above the arc-shaped reinforcing steel plate; the front and rear ends of the upper surface of the arc-shaped reinforcing steel plate are respectively connected to the two support frames through two inclined inclined beams; a plurality of arc-shaped reinforcing steel plates are fitted end to end to form an arc-shaped reinforced support structure.

[0010] Furthermore, two oblique beams at adjacent ends of the two assembled prefabricated panel structures form an acute angle near one end of the support frame, and the oblique beams are connected to the support frame by bolts.

[0011] Furthermore, a vertical reinforcement seat is fixed in the middle of the upper surface of the arc-shaped reinforcement steel plate. The center hole of the vertical reinforcement seat is connected with the threaded hole of the arc-shaped reinforcement steel plate and the center hole of the concrete precast plate to form a passage for passing the anchor pipe, and the anchor pipe is threadedly connected in the threaded hole; the front and rear ends of the vertical reinforcement seat are respectively connected to a support reinforcement structure.

[0012] Furthermore, the support reinforcement structure includes: a reinforcing cross tube fixed on the vertical reinforcement seat, the reinforcing cross tube is passed through the horizontal hole of the reinforcing ear below the support frame, and the fastening nut threaded on the outer thread surface of the reinforcing cross tube is fitted on the side of the reinforcing ear away from the vertical reinforcement seat; the outer end of the reinforcing cross tube is passed through the guide through hole of the grouting front baffle or the grouting rear baffle.

[0013] Furthermore, a transverse slide is provided at one end of the reinforcing transverse tube away from the vertical reinforcing seat, and an externally threaded rotating shaft installed in the transverse slide is rotatably connected to the vertical reinforcing seat, and a hexagonal slot adjustment block fixed on the externally threaded rotating shaft is rotatably fitted in the end of the transverse slide away from the vertical reinforcing seat, and an inverted T-shaped slide threadedly connected on the externally threaded rotating shaft is slidably connected in the transverse slide, and the middle part of the inverted T-shaped slide is slid in the strip groove on the reinforcing transverse tube, and the arc-shaped slide below the inverted T-shaped slide is slidably fitted on the upper surface of the arc-shaped reinforcing steel plate; the transverse hinge shaft rotated on the inverted T-shaped slide is connected to one end of the two anchor connecting rods, and the other end of the two anchor connecting rods is rotatably connected to the bottom of the two anchor reinforcing ribs longitudinally slid on the vertical reinforcing seat, and the top of the two anchor reinforcing ribs is provided with an inclined penetration head for inserting into the underground engineering soil layer.

[0014] A construction method, applied to the prefabricated assembled support device for tunnel construction using the drill and blast method, comprises the following steps:

[0015] Connect multiple assembled prefabricated panel structures to two supporting frames respectively, and control the end-to-end connection of multiple assembled prefabricated panel structures;

[0016] Installing a support structure consisting of multiple assembled prefabricated panel structures and support frames in the underground project, and making the support frames fit against the inner wall of the underground project;

[0017] Ensure that the anchor structure on each assembled prefabricated panel structure is anchored in the underground engineering soil layer;

[0018] Inject concrete slurry between the multiple assembled prefabricated panel structures and the inner wall of the underground project, and form a support device after normal hardening, completing the installation of a ring of support devices;

[0019] Repeat the above steps to complete the installation of the multi-ring support device.

[0020] It can be seen from the above scheme that compared with the traditional support device, the beneficial effects of the present invention are:

[0021] In the prefabricated assembled support device and construction method for tunnel construction using the drill and blast method of the present invention, the support device is composed of a support frame and a plurality of prefabricated assembled prefabricated panel structures. The number of assembled prefabricated panel structures and support frames of different lengths can be selected according to actual needs, thereby completing the rapid assembly of support devices of different sizes. There is no need to manufacture the support device on site during construction, which is beneficial to improving the construction efficiency of underground projects.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 Schematic diagram of a prefabricated assembled support device for tunnel construction using the drill and blast method provided by an embodiment of the present invention Figure 1 ;

[0025] Figure 2 Schematic diagram of a prefabricated assembled support device for tunnel construction using the drill and blast method provided by an embodiment of the present invention Figure 2 ;

[0026] Figure 3 A cross-sectional view of a prefabricated assembled support device for tunnel construction using the drill-and-blast method provided in an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of a support frame provided in an embodiment of the present invention;

[0028] Figure 5 Schematic diagram of the assembled prefabricated panel structure provided by the embodiment of the present invention Figure 1 ;

[0029] Figure 6 Schematic diagram of the assembled prefabricated panel structure provided by the embodiment of the present invention Figure 2 ;

[0030] Figure 7 A cross-sectional view of an assembled prefabricated panel structure provided in an embodiment of the present invention;

[0031] Figure 8 A schematic diagram of a precast concrete panel provided in an embodiment of the present invention;

[0032] Figure 9 A schematic diagram of a curved reinforcement steel plate provided in an embodiment of the present invention;

[0033] Figure 10 A schematic diagram of a grouting front baffle provided in an embodiment of the present invention;

[0034] Figure 11 A schematic diagram of a grouting rear baffle provided in an embodiment of the present invention;

[0035] Figure 12 A schematic diagram of a grouting left baffle provided in an embodiment of the present invention;

[0036] Figure 13 A schematic diagram of a grouting right baffle provided in an embodiment of the present invention;

[0037] Figure 14 A schematic diagram of a support reinforcement structure provided by an embodiment of the present invention;

[0038] Figure 15 This is a schematic diagram of the connection between the clamping frame and the inclined beam provided in an embodiment of the present invention.

[0039] Icons: support frame 1; assembled precast panel structure 2; concrete precast panel 201; semi-cylindrical protrusion 202; semi-cylindrical groove 203; stud 204; arc-shaped reinforcing steel plate 205; inclined beam 206; vertical reinforcing seat 207; anchor rod structure 3; grouting front baffle 4; grouting rear baffle 5; grouting left baffle 6; grouting right baffle 7; support reinforcement structure 8; reinforced cross pipe 801; external threaded rotating shaft 802; hexagonal groove adjustment block 803; inverted T-shaped slide 804; transverse hinged shaft 805; anchoring link 806; anchoring reinforcement rib 807; clamping frame 9. DETAILED DESCRIPTION

[0040] In order to clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings below, it is obvious that the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0042] Example 1

[0043] See also Figures 1-15 The present invention provides a prefabricated, assembled support device for drill-and-blast tunnel construction, comprising a support frame 1, the upper portion of which abuts against the inner wall of an underground structure. Multiple prefabricated panel structures 2, connected end-to-end, are evenly connected to the lower portion of the support frame 1. Each prefabricated panel structure 2 is connected to one or more anchor rod structures 3 for anchoring within the soil layer of the underground structure. Two support frames 1 are provided, with each prefabricated panel structure 2 connected to a support frame 1 at each of its front and rear ends.

[0044] The working principle and technical effect of the above technical solution are as follows: a prefabricated assembled support device for tunnel construction using the drill and blast method of the present invention, during installation, firstly connect a plurality of assembled prefabricated panel structures 2 to two support frames 1 respectively, and control the end-to-end connection of the plurality of assembled prefabricated panel structures 2; then install the support structure composed of the plurality of assembled prefabricated panel structures 2 and the support frame 1 in the underground project, and make the support frame 1 contact and fit with the inner wall of the underground project; finally, inject concrete slurry between the plurality of assembled prefabricated panel structures 2 and the inner wall of the underground project, and form a support device after normal hardening; the support slurry of the present invention The protective device consists of a support frame 1 and a plurality of prefabricated assembled prefabricated panel structures 2. The number of assembled prefabricated panel structures 2 and support frames 1 of different lengths and curvatures can be selected according to actual needs, thereby completing the rapid assembly of support devices of different sizes. There is no need to produce support devices on-site during construction, which is beneficial to improving the construction efficiency of underground projects. In the present invention, the shapes of the support frame 1 and the assembled prefabricated panel structure 2 can be set according to actual needs, including but not limited to: circular, horseshoe-shaped or multi-center circle curve forms, which can be suitable for prefabrication and assembly of underground projects with different cross sections according to actual conditions.

[0045] The support device in the present invention only shows the structure of one longitudinal ring. In actual application, the number of support devices installed in the present invention is set according to actual conditions. The two adjacent ring support devices can be connected by multiple transverse connecting beams, and the two ends of the transverse connecting beams are respectively inserted into the side sockets of the assembled prefabricated panel structure 2 in the adjacent two ring support devices, thereby improving the stability of the connection between the adjacent two ring support devices, and waterproof rubber gaskets can be set between the adjacent assembled prefabricated panel structures 2 to seal the connection and reduce the occurrence of leakage.

[0046] The prefabricated assembled support device for tunnel construction using the drill and blast method of the present invention adopts a prefabricated assembled structure, which can be quickly assembled, reducing construction time and labor costs. The prefabricated panel structure 2 and the support frame 1 can be transported separately, reducing transportation volume and facilitating storage and management. The arc-shaped support structure formed by the prefabricated panel structure 2 and the support frame 1 can effectively disperse and withstand pressure from all directions, thereby enhancing the overall strength and stability of the support device. The provision of the two support frames 1 further enhances the bearing capacity and stability of the device, especially in underground engineering blasting construction, and can effectively resist the impact of blasting vibration. Each prefabricated panel structure 2 is connected to an anchor structure 3, which can be anchored in the soil layer of the underground project, thereby enhancing the bonding force between the support device and the soil layer and improving the overall support effect; due to the modular design of the support device and the provision of multiple anchor structures 3, it can be flexibly adjusted and adapted to different geological conditions and underground engineering environments, and the design of the prefabricated assembled structure reduces material waste during on-site construction and improves material utilization; in addition, the combination of the support frame and the assembled prefabricated panel structure can effectively protect underground projects, reduce damage to the structure caused by blasting construction, and ensure the safety of construction workers.

[0047] The front and rear ends of each assembled prefabricated panel structure 2 are respectively connected to a grouting front baffle 4 and a grouting rear baffle 5; the front side of a support frame 1 is connected to multiple grouting front baffles 4 connected end to end, and the rear side of another support frame 1 is connected to multiple grouting rear baffles 5 connected end to end; the assembled prefabricated panel structure 2, the grouting front baffle 4, and the grouting rear baffle 5 located at the left end are connected to the grouting left baffle 6, and the assembled prefabricated panel structure 2, the grouting front baffle 4, and the grouting rear baffle 5 located at the right end are connected to the grouting right baffle 7, and a grouting trough with an open top is formed between multiple grouting front baffles 4, multiple grouting rear baffles 5, multiple assembled prefabricated panel structures 2, the grouting left baffle 6 and the grouting right baffle 7.

[0048] In the present invention, a grouting trough with an open top is formed between multiple grouting front baffles 4, multiple grouting rear baffles 5, multiple assembled prefabricated panel structures 2, the grouting left baffle 6 and the grouting right baffle 7, which is more conducive to the stable injection of concrete slurry, filling and reinforcing the soil layer around the underground project, and enhancing the overall strength and stability of the support device. In particular, in the blasting construction of underground projects, it can effectively resist the impact of blasting vibrations, and the modular design of the grouting front baffle 4, the grouting rear baffle 5, the assembled prefabricated panel structure 2 and other components allows the device to be flexibly adjusted and combined according to different geological conditions and engineering requirements, and has stronger adaptability; and makes the grouting process simpler, can quickly carry out grouting operations, shortens the construction period, and has the advantages of improving the overall strength of the support device, strong flexibility and adaptability, convenient construction, high economic benefits and high safety.

[0049] By injecting concrete slurry into the grouting trough with an open top formed between multiple grouting front baffles 4, multiple grouting rear baffles 5, multiple assembled prefabricated panel structures 2, grouting left baffles 6 and grouting right baffles 7, compared with spraying concrete slurry on the inner wall of the underground project, it has the following advantages: a space for filling concrete slurry is formed between the grouting trough and the inner wall of the underground project, and the concrete slurry can directly adapt to the inner wall of the underground project with different concave and convex conditions after filling, without adjusting the thickness of the sprayed concrete slurry according to the concave and convex conditions of the inner wall of the underground project, avoiding the inner wall of the underground project and the support caused by uneven spraying of mud. The problem of unstable connection of the supporting device and the problem of leakage and waste of concrete slurry that may occur when spraying concrete slurry are solved. The concrete slurry filled in the present invention is relatively dense and can be evenly filled in the groove to ensure that the slurry is evenly distributed in all directions, thereby enhancing the bonding force between the supporting device and the soil layer, improving the overall support effect, and improving the stability of the connection between the supporting device and the inner wall of the underground project. The design of the grouting trough makes the grouting process relatively simple, and the grouting operation can be carried out quickly, shortening the construction period. Compared with spraying concrete slurry, the grouting process in the grouting trough is more controllable, reducing the construction difficulty and labor cost. Compared with spraying concrete slurry, the grouting process in the grouting trough can also reduce the generation of dust and splashing, thereby improving the construction environment.

[0050] In addition, multiple grouting front baffles 4 and multiple grouting rear baffles 5 can also be used to support the inner wall of the underground project to improve the support strength and support stability.

[0051] The anchor rod structure 3 comprises an anchor pipe with a grouting channel provided therein, and a plurality of grouting holes communicated with the grouting channel are provided on the side wall of the pipe body of the anchor pipe inserted into the grouting groove. The anchor pipe is inserted into a pre-drilled hole in the inner wall of the underground project. The length of the anchor pipe can be selected according to actual needs and is not a fixed length. After the anchor pipe is inserted into the hole in the inner wall of the underground project, slurry is injected to form a stable connection structure between the anchor pipe and the hole in the inner wall of the underground project. The setting of this structure enables the anchor pipe to be used not only as an anchor reinforcement structure, but also as a concrete slurry delivery pipeline, integrating anchoring and grouting. This versatility simplifies the structure of the device and reduces the need for additional equipment and pipelines. Grouting through the anchor pipe reduces the installation and disassembly process of independent grouting equipment and pipelines, simplifies the construction process, and improves construction efficiency. The anchor pipe is directly used as a grouting channel, which can quickly inject concrete slurry into the grouting trough, shortening the construction period. The side wall of the anchor pipe body is provided with multiple grouting holes connected to the grouting channel, which can ensure that the concrete slurry is evenly injected into the grouting trough, improves the grouting effect and support stability, and makes the connection stability between the concrete slurry and the anchor pipe better.

[0052] The assembled precast panel structure 2 includes: a concrete precast panel 201 of an arc-shaped structure, one end of the concrete precast panel 201 is provided with a semi-cylindrical protrusion 202, and the other end of the concrete precast panel 201 is provided with a semi-cylindrical groove 203, and the semi-cylindrical protrusion 202 and the semi-cylindrical groove 203 of two adjacent concrete precast panels 201 are interlocked and connected; a plurality of studs 204 are provided on the top of each concrete precast panel 201, and the plurality of studs 204 are passed through the through holes of the arc-shaped reinforcing steel plate 205, and the assembly nuts threadedly connected above the plurality of studs 204 are clamped above the arc-shaped reinforcing steel plate 205; the front and rear ends of the upper surface of the arc-shaped reinforcing steel plate 205 are respectively connected to the two support frames 1 through two inclined inclined beams 206; a plurality of arc-shaped reinforcing steel plates 205 are fitted end to end to form an arc-shaped reinforced support structure.

[0053] The working principle and technical effects of the above technical solution are as follows:

[0054] In the assembled prefabricated panel structure 2, a semi-cylindrical protrusion 202 is provided at one end of the concrete prefabricated panel 201, and a semi-cylindrical groove 203 is provided at the other end. The protrusions and grooves of two adjacent concrete prefabricated panels 201 are connected in a chiseled manner to realize modular splicing; a plurality of studs 204 are provided on the top of each concrete prefabricated panel 201, and the studs 204 are passed through the through holes of the arc-shaped reinforcing steel plate 205 and fixed by assembling nuts, so that the concrete prefabricated panel 201 and the arc-shaped reinforcing steel plate 205 can be quickly connected or disassembled, and the stability and bearing capacity of the structure are enhanced. In addition, the concrete prefabricated panel 201 and the arc-shaped reinforcing steel plate 205 can be transported separately, reducing the transportation volume and facilitating storage and management; the arc-shaped reinforcing steel plate 205 is connected to the support frame 1 through two inclined beams 206 to form an arc-shaped reinforced support structure. Since a semi-cylindrical protrusion 202 is provided at one end of the precast concrete panel 201 and a semi-cylindrical groove 203 is provided at the other end, the cylindrical structure connection method is adopted, which not only improves the connection stability of the two precast concrete panels 201, but also makes it difficult to damage the semi-cylindrical protrusion 202 and the semi-cylindrical groove 203, and the semi-cylindrical protrusion 202 and the semi-cylindrical groove 203 are easier to assemble.

[0055] Because the precast concrete panels 201 are provided with a semi-cylindrical protrusion 202 at one end and a semi-cylindrical groove 203 at the other end, the cylindrical structure connection method is adopted. The interlocking connection between the semi-cylindrical protrusion and the groove provides a closer contact surface, making the connection between the two precast concrete panels 201 more secure. The cylindrical structure connection method enhances the stability of the connection through geometric matching. The cylindrical design also reduces impact and wear on the connection parts during transportation, installation, and use, reducing the risk of damage to the semi-cylindrical protrusion 202 and semi-cylindrical groove 203. The protection provided by the geometric shape makes the connection parts more durable. The cylindrical structure connection method also provides more accurate positioning and orientation, making the assembly process smoother. The matching of the semi-cylindrical protrusion and the groove reduces the error and adjustment time during assembly, thereby speeding up the assembly, reducing the construction time and improving the construction efficiency; and the cylindrical structure connection method improves the stability and durability of the connection parts and reduces the risk of injury to personnel; in summary, the cylindrical structure connection method not only improves the connection stability between the two concrete precast panels and reduces the risk of injury, but also is easy to assemble, and has the advantages of strong flexibility and adaptability, convenient construction, high economic benefits and high safety.

[0056] The two inclined beams 206 at the adjacent ends of the two assembled prefabricated panel structures 2 form an acute angle close to one end of the support frame 1, and the inclined beams 206 are connected to the support frame 1 by bolts.

[0057] The working principle and technical effects of the above technical solution are as follows:

[0058] The two inclined beams 206 at the adjacent ends of the two assembled prefabricated panel structures 2 form an acute angle near one end of the support frame 1, forming a stable triangular structure. By forming an acute angle, the connection between the two inclined beams 206 of the two adjacent assembled prefabricated panel structures 2 and the support frame 1 constitutes a triangular structure, which significantly enhances the stability of the overall structure. In underground engineering blasting construction, the triangular structure can effectively resist blasting vibration and external pressure, maintain the stability of the structure, and the triangular structure can evenly disperse stress and avoid stress concentration. The acute angle structure formed by the two inclined beams 206 disperses stress in multiple directions, thereby improving the bearing capacity and compressive performance of the structure, providing stronger connection stability, and increasing the bearing capacity of the structure.

[0059] A vertical reinforcement seat 207 is fixed in the middle of the upper surface of the curved reinforcement steel plate 205. The center hole of the vertical reinforcement seat 207 communicates with the threaded hole of the curved reinforcement steel plate 205 and the center hole of the precast concrete plate 201, forming a passage for inserting an anchor pipe, which is threaded into the threaded hole. The front and rear ends of the vertical reinforcement seat 207 are each connected to a support reinforcement structure 8. The provision of the vertical reinforcement seat 207 helps to improve the structural strength of the curved reinforcement steel plate 205. The center hole of the vertical reinforcement seat 207 communicates with the threaded hole of the curved reinforcement steel plate 205 and the center hole of the precast concrete plate 201, facilitating the installation of the anchor pipe. The threaded hole in the center of the curved reinforcement steel plate 205 facilitates the fixing of the anchor pipe, ensuring good stability of the connection between the anchor pipe and the curved reinforcement steel plate 205 and facilitating construction. The front and rear ends of the vertical reinforcement seat 207 are each connected to a support reinforcement structure 8, further enhancing the strength and stability of the overall structure of the present invention.

[0060] The support reinforcement structure 8 includes: a reinforcing transverse tube 801 fixed on the vertical reinforcing seat 207, the reinforcing transverse tube 801 is passed through the transverse hole of the reinforcing ear below the support frame 1, and the fastening nut threaded on the external thread surface of the reinforcing transverse tube 801 is fitted on the side of the reinforcing ear away from the vertical reinforcing seat 207; the outer end of the reinforcing transverse tube 801 is passed through the guide through-hole of the grouting front baffle 4 or the grouting rear baffle 5.

[0061] The reinforcing cross tube 801 is passed through the horizontal hole of the reinforcing lifting ear below the support frame 1, and is threadedly connected to the fastening nut on the external thread surface of the reinforcing cross tube 801 and is in contact with the side of the reinforcing lifting ear away from the vertical reinforcing seat 207. This design significantly enhances the connection stability between the various structures; through the combination of the reinforcing cross tube 801, the reinforcing lifting ear and the fastening nut, multiple fixations are formed to prevent relative displacement between the various structures and improve the stability of the overall structure; the insertion and fastening method of the reinforcing cross tube 801 disperses stress and avoids stress concentration. The connection between the reinforcing cross tube 801 and the reinforcing lifting ear disperses stress in multiple directions, thereby improving the bearing capacity and compressive resistance of the structure. The insertion and fastening method of the reinforcing cross tube 801 is relatively simple, which is convenient for quick assembly and disassembly, reduces construction difficulty and labor costs, improves construction efficiency, makes the construction process easier to control, and reduces unnecessary adjustments and interference.

[0062] The end of the reinforcing transverse tube 801 away from the vertical reinforcing seat 207 is provided with a transverse slideway, and the external threaded shaft 802 installed in the transverse slideway is rotatably connected to the vertical reinforcing seat 207, and the hexagonal groove adjustment block 803 fixed on the external threaded shaft 802 is rotatably matched with the end of the transverse slideway away from the vertical reinforcing seat 207, and the inverted T-shaped slide 804 threadedly connected to the external threaded shaft 802 is slidably connected in the transverse slideway, and the middle part of the inverted T-shaped slide 804 is slidably arranged on the reinforcing transverse tube 80 1, the arc-shaped slide plate below the inverted T-shaped slide 804 slides on the upper surface of the arc-shaped reinforcing steel plate 205; the horizontal hinge shaft 805 rotated on the inverted T-shaped slide 804 is connected to one end of the two anchoring links 806, and the other ends of the two anchoring links 806 are rotatably connected to the bottom of the two anchoring reinforcement ribs 807 longitudinally slidably on the vertical reinforcement seat 207. The tops of the two anchoring reinforcement ribs 807 are provided with inclined penetration heads for inserting into the underground engineering soil layer.

[0063] The working principle and technical effects of the above technical solution are as follows:

[0064] In order to further increase the stability during anchoring, the above structure is designed. During installation, the external threaded shaft 802 is rotated to change the contact position between the external threaded shaft 802 and the inverted T-shaped slide 804, thereby controlling the inverted T-shaped slide 804 to slide in the horizontal slide and the strip groove, and controlling the inverted T-shaped slide 804 to slide on the upper surface of the arc-shaped reinforcing steel plate 205 toward the vertical reinforcing seat 207. At this time, the inverted T-shaped slide 804 pushes one end of the two anchoring links 806 toward the vertical reinforcing seat 207 through the horizontal hinge shaft 805. The two anchoring links 806 drive the two anchoring reinforcement bars 807 to slide upward on the vertical reinforcement seat 207, thereby being inserted into the underground engineering soil layer. The tops of the two anchoring reinforcement bars 807 are provided with inclined penetration heads for inserting into the underground engineering soil layer, which is beneficial to improving the penetration effect. When pouring concrete slurry, the concrete slurry can also enter the horizontal slideway of the reinforcing cross pipe 801 through the strip groove, thereby improving the stability of the connection between the concrete slurry and the reinforcing cross pipe 801 and improving the overall connection stability of the present invention.

[0065] By rotating the external threaded shaft 802, the contact position between the external threaded shaft and the inverted T-shaped slide 804 can be changed, thereby controlling the sliding of the inverted T-shaped slide in the horizontal slide and the strip groove. This design provides flexibility and adjustability, allowing users to adjust and optimize according to specific geological conditions and engineering requirements. The inverted T-shaped slide 804 slides on the upper surface of the arc-shaped reinforcing steel plate 205 toward the vertical reinforcing seat 207. This position control increases the adaptability and flexibility of the anchoring system. Rotating the external threaded shaft 802 is simple to operate and facilitates quick adjustment and positioning. By controlling the sliding of the inverted T-shaped slide 804, the advancement process of the anchoring link 806 and the anchoring reinforcement rib 807 is easier to control: the advancement method of the anchoring reinforcement rib 807 improves the stability and bearing capacity of the overall support device, can effectively protect underground projects, reduce damage to the structure caused by blasting construction, and ensure the safety of construction workers.

[0066] The lower ends of the grouting front baffle 4 and the grouting rear baffle 5 are slid into the inverted T-shaped grooves at the front and rear ends of the arc-shaped reinforcing steel plate 205 through inverted T-shaped blocks, making it easier to assemble the grouting front baffle 4 and the grouting rear baffle 5 with the arc-shaped reinforcing steel plate 205 and improving the stability of the connection.

[0067] The shape of the inverted T-shaped block and the inverted T-shaped groove ensures the accurate position and orientation of the baffle during the assembly process, avoiding the need for misalignment and adjustment; the interlocking connection of the inverted T-shaped block and the inverted T-shaped groove provides a tighter contact surface, making the connection between the baffle and the arc-shaped reinforcing steel plate more secure, reducing the relative displacement of the connection part, and improving the stability of the overall structure.

[0068] The grouting left baffle 6 is provided with a groove that cooperates with the semi-cylindrical protrusion 202 of the leftmost concrete precast panel 201, and the grouting right baffle 7 is provided with a protrusion that cooperates with the semi-cylindrical groove 203 of the rightmost concrete precast panel 201, so that a stable grouting groove structure is formed between the multiple grouting front baffles 4, the multiple grouting rear baffles 5, the multiple assembled precast panel structures 2, the grouting left baffle 6 and the grouting right baffle 7, thereby reducing the probability of leakage. A sealing structure can also be added at the connection between the semi-cylindrical protrusion 202 and the semi-cylindrical groove 203, such as adding a rubber gasket, to further reduce the probability of leakage.

[0069] A snap-in groove is provided on the outer side of the two oblique beams 206 of each assembled prefabricated panel structure 2. The two snap-in grooves are connected to the clamping blocks at both ends of the snap-in frame 9. The snap-in frame 9 is slid on the reinforcing cross tube 801. The fastening nut threaded on the reinforcing cross tube 801 is in contact with the side surface of the snap-in frame 9 away from the reinforcing lifting ear. The snap-in frame 9 is installed between the fastening nut and the reinforcing lifting ear.

[0070] The above structural design can improve the stability of the two inclined beams 206 of the assembled prefabricated panel structure 2. The close fit between the clamping groove and the clamping block provides a more secure connection, preventing the relative displacement and sliding of the inclined beam 206. The combination of the clamping frame 9, the reinforced cross tube 801, the fastening nut and the reinforced lifting ear forms multiple fixations, preventing the relative displacement between the structures and improving the stability of the overall structure. The sliding and fastening methods of the clamping frame 9 are relatively simple, which is convenient for quick assembly and disassembly; and the connection between the clamping groove and the clamping block improves the stability and bearing capacity of the overall structure, can effectively protect underground projects, reduce the damage to the structure caused by blasting construction, ensure the safety of construction personnel, and significantly improve the seismic performance.

[0071] Example 2

[0072] See also Figures 1-15 The present invention provides a construction method, which is applied to the prefabricated assembled support device for tunnel construction using the drill and blast method, and the method comprises the following steps:

[0073] Connecting the multiple assembled prefabricated panel structures 2 to the two support frames 1 respectively, and controlling the end-to-end connection of the multiple assembled prefabricated panel structures 2;

[0074] Installing a support structure consisting of a plurality of assembled prefabricated panel structures 2 and a support frame 1 in the underground project, and making the support frame 1 abut against the inner wall of the underground project;

[0075] Controlling that the anchor rod structure 3 on each assembled prefabricated panel structure 2 is anchored in the underground engineering soil layer;

[0076] Inject concrete slurry between the multiple assembled prefabricated panel structures 2 and the inner wall of the underground project, and form a support device after normal hardening, completing the installation of a ring of support devices;

[0077] Repeat the above steps to complete the installation of the multi-ring support device.

[0078] The construction method of the prefabricated assembled support device for tunnel construction using the drill and blast method of the present invention is simple to operate and highly efficient, and is beneficial to improving the blasting construction speed of underground engineering.

[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0080] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0081] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A prefabricated assembled support device for tunnel construction using the drill and blast method, characterized in that: include: A support frame (1) is provided, wherein the upper portion of the support frame (1) is in contact with the inner wall of the underground project, and the lower portion of the support frame (1) is evenly connected to a plurality of prefabricated panel structures (2) connected end to end; each prefabricated panel structure (2) is connected to one or more anchor rod structures (3) for anchoring in the soil layer of the underground project.

2. The prefabricated assembled support device for tunnel construction using the drill and blast method according to claim 1 is characterized in that: The support frame (1) is an arc-shaped structure. Two support frames (1) are provided, and the front and rear ends of the upper surfaces of the multiple assembled prefabricated panel structures (2) are respectively connected to one support frame (1).

3. The prefabricated assembled support device for tunnel construction using the drill and blast method according to claim 2, characterized in that: The front and rear ends of each assembled prefabricated panel structure (2) are respectively connected to a grouting front baffle (4) and a grouting rear baffle (5); the front side of one support frame (1) is connected to a plurality of grouting front baffles (4) connected end to end, and the rear side of another support frame (1) is connected to a plurality of grouting rear baffles (5) connected end to end; the assembled prefabricated panel structure (2), the grouting front baffle (4), and the grouting rear baffle (5) at the left end are connected to the grouting left baffle (6), and the assembled prefabricated panel structure (2), the grouting front baffle (4), and the grouting rear baffle (5) at the right end are connected to the grouting right baffle (7); and a grouting trough with an open top is formed between the plurality of grouting front baffles (4), the plurality of grouting rear baffles (5), the plurality of assembled prefabricated panel structures (2), the grouting left baffle (6), and the grouting right baffle (7).

4. The prefabricated assembled support device for tunnel construction using the drill and blast method according to claim 3 is characterized in that: The anchor rod structure (3) comprises an anchor pipe with a grouting channel provided inside, and a plurality of grouting holes communicated with the grouting channel are provided on the side wall of the pipe body of the anchor pipe inserted into the grouting groove.

5. The prefabricated assembled support device for tunnel construction using the drill and blast method according to claim 3 is characterized in that: The assembled prefabricated panel structure (2) comprises: a concrete prefabricated panel (201) of an arc structure, wherein one end of the concrete prefabricated panel (201) is provided with a semi-cylindrical protrusion (202), and the other end of the concrete prefabricated panel (201) is provided with a semi-cylindrical groove (203), and the semi-cylindrical protrusion (202) and the semi-cylindrical groove (203) of two adjacent concrete prefabricated panels (201) are engaged and connected; each concrete prefabricated panel (201) is provided with a semi-cylindrical protrusion (202) at the top. A plurality of studs (204) are provided, the plurality of studs (204) being passed through the through holes of the arc-shaped reinforcement steel plate (205), and assembly nuts threadedly connected above the plurality of studs (204) being clamped above the arc-shaped reinforcement steel plate (205); the front and rear ends of the upper surface of the arc-shaped reinforcement steel plate (205) are respectively connected to the two support frames (1) through two inclined beams (206); and the plurality of arc-shaped reinforcement steel plates (205) are fitted end to end to form an arc-shaped reinforcement support structure.

6. The prefabricated assembled support device for tunnel construction using the drill and blast method according to claim 5, characterized in that: Two oblique beams (206) at adjacent ends of the two assembled prefabricated panel structures (2) form an acute angle close to one end of the support frame (1), and the oblique beams (206) are connected to the support frame (1) by bolts.

7. The prefabricated assembled support device for tunnel construction using the drill and blast method according to claim 5, characterized in that: A vertical reinforcement seat (207) is fixed in the middle of the upper surface of the arc-shaped reinforcement steel plate (205). The center hole of the vertical reinforcement seat (207) is connected with the threaded hole of the arc-shaped reinforcement steel plate (205) and the center hole of the concrete precast plate (201), forming a passage for passing an anchor pipe. The anchor pipe is threadedly connected in the threaded hole. The front and rear ends of the vertical reinforcement seat (207) are respectively connected to a support reinforcement structure (8).

8. The prefabricated assembled support device for tunnel construction using the drill and blast method according to claim 7, characterized in that: The support reinforcement structure (8) comprises: a reinforcement transverse tube (801) fixed on the vertical reinforcement seat (207), the reinforcement transverse tube (801) is inserted into the transverse hole of the reinforcement lifting ear below the support frame (1), and a fastening nut threadedly connected to the outer thread surface of the reinforcement transverse tube (801) is abutted against the side of the reinforcement lifting ear away from the vertical reinforcement seat (207); the outer end of the reinforcement transverse tube (801) is inserted into the guide through hole of the grouting front baffle (4) or the grouting rear baffle (5).

9. The prefabricated assembled support device for tunnel construction using the drill and blast method according to claim 8, characterized in that: A transverse slideway is provided at one end of the reinforcing transverse tube (801) away from the vertical reinforcing seat (207), an external threaded shaft (802) installed in the transverse slideway is rotatably connected to the vertical reinforcing seat (207), a hexagonal groove adjustment block (803) fixed on the external threaded shaft (802) is rotatably matched to one end of the transverse slideway away from the vertical reinforcing seat (207), an inverted T-shaped slide (804) threadedly connected to the external threaded shaft (802) is slidably connected to the transverse slideway, and the middle part of the inverted T-shaped slide (804) is slidably arranged on the reinforcing transverse tube (801). 01), the arc-shaped slide below the inverted T-shaped slide (804) slides on the upper surface of the arc-shaped reinforcing steel plate (205); the horizontal hinge shaft (805) rotated on the inverted T-shaped slide (804) is connected to one end of the two anchoring links (806), and the other ends of the two anchoring links (806) are rotatably connected to the bottom of two anchoring reinforcement bars (807) longitudinally slidably on the vertical reinforcement seat (207), and the tops of the two anchoring reinforcement bars (807) are provided with inclined penetration heads for inserting into the underground engineering soil layer.

10. A construction method, applied to the prefabricated assembled support device for tunnel construction using the drill and blast method according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Connecting the plurality of assembled prefabricated panel structures (2) to the two support frames (1) respectively, and controlling the end-to-end connection of the plurality of assembled prefabricated panel structures (2); Installing a support structure composed of a plurality of assembled prefabricated panel structures (2) and a support frame (1) in an underground project, and making the support frame (1) abut against the inner wall of the underground project; Controlling that the anchor rod structure (3) on each assembled prefabricated panel structure (2) is anchored in the underground engineering soil layer; Injecting concrete slurry between the multiple assembled prefabricated panel structures (2) and the inner wall of the underground project, and forming a support device after normal hardening, thereby completing the installation of a ring of support devices; Repeat the above steps to complete the installation of the multi-ring support device.

Images