Drilling and blasting method railway tunnel local prefabricated bottom structure and construction technology

Abstract

According to the drilling and blasting method railway tunnel local prefabricated bottom structure and the construction technology, a prefabricated bottom structural part is provided with a tensioning hole and a through hole, and a bolt penetrates through the tensioning hole and then is connected with a nut in a screwed mode; self-compacting concrete and a concrete cushion layer are arranged between the prefabricated bottom structural member and the tunnel inverted arch. The first concrete mounting block is connected with the prefabricated bottom structural part and the tunnel arch wall. The concrete mounting block II is simultaneously connected with the prefabricated bottom structural member and the concrete mounting block I; the tunnel drainage and cable groove is connected with the first concrete mounting block and the second concrete mounting block at the same time. The bottom structure of the tunnel comprises the prefabricated bottom structural part, the first concrete mounting block, the second concrete mounting block and the tunnel drainage and cable groove, the bottom structure of the tunnel is simple, and the workload is small; the construction process of the tunnel bottom structure is simple, the construction efficiency is high, the construction quality is stable, and the service life of the tunnel bottom structure, the tunnel inverted arch and the like can be prolonged.

Description

Technical Field

[0001] The invention relates to the field of tunnel structure construction, and more specifically to a local prefabricated bottom structure of a railway tunnel using a drill and blast method and a construction process. Background Art

[0002] Tunnels excavated using the drilling and blasting method require multiple subsequent structural constructions, including initial support, tunnel arch walls, and tunnel bottom structure construction. In particular, the tunnel bottom structure requires a large amount of labor, has a long construction period, low construction efficiency, and is difficult to control in terms of construction quality. In the later operation of the tunnel, the tunnel bottom structure is most likely to have quality problems;

[0003] The existing tunnel bottom structure construction is generally cast on site. Affected by the construction period and the construction party, the construction efficiency of the tunnel bottom structure is low and the construction quality cannot be guaranteed. The tunnel bottom structure construction involves multiple processes, such as steel bar binding, mold support, and tunnel drainage and cable trough casting. Each process takes a long time. In addition, during the above construction, the weight of the tunnel bottom structure is uneven, and the pressure exerted by the tunnel bottom structure on the invert is also uneven. After the tunnel has been used for a period of time, the tunnel bottom structure may suffer from cracks or subsidence and other defects.

[0004] Therefore, how to provide a local prefabricated bottom structure and construction process for a railway tunnel using a drill and blast method so as to overcome the above problems is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a local prefabricated bottom structure of a railway tunnel using a drill and blast method and a construction process.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A local prefabricated bottom structure of a railway tunnel using a drill and blast method, comprising: a prefabricated bottom structure, a first concrete mounting block, a second concrete mounting block, and a tunnel drainage and cable trough, wherein the prefabricated bottom structure is provided with a plurality of prefabricated bottom structures and arranged in sequence along the length direction of the tunnel, the prefabricated bottom structure is provided with tensioning holes and through holes penetrating its end surface, the hole length directions of the tensioning holes and the through holes are both the same as the length direction of the tunnel, one end of the bolt is screwed with a nut after sequentially passing through a plurality of tensioning holes that are directly opposite to each other along the length direction of the tunnel; a grouting hole penetrating the bottom surface of the prefabricated bottom structure is provided on the hole wall of the through hole, the bottom surface of the prefabricated bottom structure is adapted to the shape and size of the tunnel invert, and the bottom surface of the prefabricated bottom structure is aligned with the tunnel invert. Self-compacting concrete and concrete cushion layers are arranged in sequence from top to bottom; two concrete mounting blocks are provided and are arranged on opposite sides of the prefabricated bottom structure respectively, one ends of the two concrete mounting blocks are respectively connected to the opposite sides of the prefabricated bottom structure, and the other ends of the two concrete mounting blocks are connected to the tunnel arch wall; two concrete mounting blocks are provided and are arranged on opposite sides of the prefabricated bottom structure respectively, and each of the concrete mounting blocks is connected to the prefabricated bottom structure and the concrete mounting block one at the same time; two tunnel drainage and cable troughs are provided and are arranged on opposite sides of the prefabricated bottom structure respectively, and the tunnel drainage and cable troughs are connected to the concrete mounting block one and the concrete mounting block two at the same time.

[0008] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a local prefabricated bottom structure of a railway tunnel using a drill and blast method. The bottom structure of the tunnel in the present invention includes a plurality of prefabricated bottom structural members arranged in sequence along the length direction of the tunnel. Combined with the design of tensioning holes, bolts and nuts, adjacent prefabricated bottom structural members can be arranged closely, and a plurality of prefabricated bottom structural members can be tightened by bolts and nuts, so that the integrity of the bottom structure is better and the force on the tunnel invert is more uniform. A concrete cushion layer is provided between the prefabricated bottom structural member and the tunnel invert. The design of the concrete cushion layer ensures that the prefabricated bottom When the structural parts are being installed, the end faces of the prefabricated bottom structural parts can be reliably arranged vertically; the self-compacting concrete can be filled between the bottom faces of the prefabricated bottom structural parts and the concrete cushion layer. This design ensures that the prefabricated bottom structural parts can be reliably fixed to the concrete cushion layer, and the prefabricated bottom structural parts will not loosen later; the design of the concrete mounting block one ensures that the prefabricated bottom structural parts and the tunnel invert can be reliably connected; the design of the concrete mounting block two ensures that the tunnel drainage and cable trough can be reliably installed, and at the same time, the concrete mounting block two can improve the connection reliability between the concrete mounting block one and the prefabricated bottom structural parts.

[0009] Preferably, the prefabricated bottom structure is provided with weight-reducing holes penetrating both end surfaces thereof, and the weight-reducing holes are provided in plurality and arranged symmetrically about the center line of the through hole; and a hoisting hole connected to the weight-reducing hole is provided on the top surface of the prefabricated bottom structure. The weight of the prefabricated bottom structure is as light as possible, which reduces the pressure on the tunnel invert, and helps to improve the service life of the tunnel bottom structure and the tunnel invert.

[0010] Preferably, a plurality of connecting steel bars are pre-embedded on two opposite sides of the prefabricated bottom structure, and one end of the connecting steel bars away from the prefabricated bottom structure is cast in the concrete installation block 1. The prefabricated bottom structure and the concrete installation block 1 can be reliably connected.

[0011] A construction process for a local prefabricated bottom structure of a railway tunnel using a drill and blast method, the process steps are as follows:

[0012] ① Excavate the tunnel and provide initial support;

[0013] ② Conducting cross-section quality inspection on the tunnel invert and laying the concrete cushion layer to ensure that the plurality of prefabricated bottom structural members can be accurately installed in sequence along the length direction of the tunnel;

[0014] ③ Move the prefabricated bottom structure into the tunnel and install it, ensuring that the top surfaces and side surfaces of the plurality of prefabricated bottom structure are aligned with each other;

[0015] ④ Install the bolts and nuts to tighten the plurality of prefabricated bottom structural members along the length direction of the tunnel;

[0016] ⑤ injecting the self-compacting concrete into the space between the bottom surface of the prefabricated bottom structure and the concrete cushion through the grouting hole;

[0017] ⑥ pouring the concrete installation block 1;

[0018] ⑦ After the concrete installation block 1 is initially set, the concrete installation block 2 is poured;

[0019] ⑧ After the concrete installation block 2 is initially set, pour the tunnel drainage and cable trough;

[0020] ⑨ Carry out cast-in-place construction of the tunnel arch wall to ensure that both of the two concrete mounting blocks are connected to the tunnel arch wall.

[0021] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a construction process for the local prefabrication of the bottom structure of a railway tunnel using the drilling and blasting method. The following technical effects can be achieved: the construction process is simple and has high construction efficiency, stable construction quality, low requirements for construction technology, uniform force on the tunnel invert, and the bottom structure and the invert are not prone to disease in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 It is a cross-sectional schematic diagram of a partially prefabricated bottom structure of a railway tunnel using the drill and blast method.

[0024] In the figure:

[0025] 01 is the prefabricated bottom structure, 010 is the tensioning hole, 011 is the through hole, 012 is the grouting hole, 013 is the weight reduction hole, 014 is the lifting hole, 02 is the concrete mounting block 1, 03 is the concrete mounting block 2, 04 is the tunnel drainage and cable trough, 05 is the concrete cushion layer, 06 is the tunnel arch wall, 07 is the connecting steel bar, and 08 is the initial support. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The present invention discloses a local prefabricated bottom structure of a railway tunnel using a drill and blast method and a construction process. The bottom structure of the tunnel in the present invention comprises a plurality of prefabricated bottom structural members 01 arranged in sequence along the length direction of the tunnel. Combined with the design of tensioning holes 010, bolts and nuts, adjacent prefabricated bottom structural members 01 can be closely arranged, and a plurality of prefabricated bottom structural members 01 can be tightened by bolts and nuts, so that the bottom structure has better integrity and the force of the tunnel invert is more uniform.

[0028] A concrete cushion layer 05 is provided between the prefabricated bottom structure 01 and the tunnel invert. The design of the concrete cushion layer 05 ensures that the end surface of the prefabricated bottom structure 01 can be reliably arranged vertically when the prefabricated bottom structure 01 is installed.

[0029] A grouting hole 012 is provided on the hole wall of the through hole 011, and the space between the bottom surface of the prefabricated bottom structure 01 and the concrete cushion layer 05 can be filled with self-compacting concrete. This design ensures that the prefabricated bottom structure 01 can be reliably fixed to the concrete cushion layer 05, and the prefabricated bottom structure 01 will not loosen later;

[0030] The design of the weight-reducing hole 013 ensures that the prefabricated bottom structure 01 meets the strength requirements while being as light as possible. The pressure above the tunnel invert is low, which is beneficial to improving the stability and service life of the tunnel bottom structure.

[0031] The design of the concrete mounting block 02 ensures that the prefabricated bottom structure 01 and the tunnel invert can be reliably connected;

[0032] The design of the concrete installation block 2 03 ensures that the tunnel drainage and cable trough 04 can be reliably installed. At the same time, the concrete installation block 2 03 can improve the connection reliability between the concrete installation block 1 02 and the prefabricated bottom structure 01;

[0033] The bottom structure of the tunnel in this application includes a prefabricated bottom structure 01, a concrete mounting block 02, a concrete mounting block 02, and a tunnel drainage and cable trough 04. The bottom structure of the tunnel is simple and the workload is small;

[0034] The tunnel bottom structure has a simple construction process, high construction efficiency and stable construction quality, which helps to improve the service life of the tunnel bottom structure and tunnel invert, etc.

[0035] Example

[0036] See attached Figure 1 This is a structural schematic diagram of an embodiment of the present invention, which specifically discloses a local prefabricated bottom structure of a railway tunnel using a drill and blast method, including: a prefabricated bottom structure 01, a concrete installation block 1 02, a concrete installation block 2 03, and a tunnel drainage and cable trough 04, all made of concrete;

[0037] There are multiple prefabricated bottom structural members 01 and they are arranged in sequence along the length direction of the tunnel. The end faces of every two adjacent prefabricated bottom structural members 01 are tightly attached. The prefabricated bottom structural member 01 is provided with tensioning holes 010 and through holes 011 penetrating its end faces. There are multiple tensioning holes 010. The hole length directions of the tensioning holes 010 and the through holes 011 are both the same as the length direction of the tunnel. One end of the bolt is screwed with the nut after sequentially passing through the multiple tensioning holes 010 that are directly opposite to each other along the length direction of the tunnel. The nut and the nut of the bolt can press the multiple prefabricated bottom structural members 01 along the length direction of the tunnel.

[0038] A grouting hole 012 penetrating the bottom surface of the prefabricated bottom structure 01 is provided on the hole wall of the through hole 011. The bottom surface of the prefabricated bottom structure 01 is adapted to the shape and size of the tunnel invert. Self-compacting concrete and a concrete cushion layer 05 are provided in sequence from top to bottom between the bottom surface of the prefabricated bottom structure 01 and the tunnel invert. The prefabricated bottom structure 01 is placed on the concrete cushion layer 05. The gap between the two is filled with self-compacting concrete. The self-compacting concrete can reliably fix the prefabricated bottom structure 01 and the concrete cushion layer 05 together, so that the prefabricated bottom structure 01 will not loosen or shake, and the tunnel invert is evenly stressed.

[0039] There are two concrete mounting blocks 02, each of which is arranged on two opposite sides of the prefabricated bottom structure 01. One end of the two concrete mounting blocks 02 is connected to the two opposite sides of the prefabricated bottom structure 01, and the other ends of the two concrete mounting blocks 02 are connected to the tunnel arch wall 06. The concrete mounting blocks 02 can reliably connect the prefabricated bottom structure 01 and the tunnel arch wall 06.

[0040] There are two concrete mounting blocks 03, each of which is arranged on two opposite sides of the prefabricated bottom structure 01. Each concrete mounting block 03 is connected to the prefabricated bottom structure 01 and the concrete mounting block 02 at the same time. The top surface of the concrete mounting block 03 is arranged horizontally, which is convenient for the later concrete cast-in-place construction of the tunnel drainage and cable trough 04, ensuring that the tunnel drainage and cable trough 04 can be reliably connected to the concrete mounting block 02 and the concrete mounting block 03.

[0041] There are two tunnel drainage and cable troughs 04, each arranged on two opposite sides of the prefabricated bottom structure 01. The tunnel drainage and cable trough 04 is connected to the concrete mounting block 1 02 and the concrete mounting block 2 03 at the same time. The tunnel drainage and cable trough 04 in this embodiment has a drainage trough and a cable trough.

[0042] The prefabricated bottom structure 01 is provided with weight-reducing holes 013 penetrating through both end surfaces thereof, and a plurality of weight-reducing holes 013 are provided and are arranged symmetrically about the center line of the through hole 011;

[0043] A hoisting hole 014 communicating with the weight-reducing hole 013 is provided on the top surface of the prefabricated bottom structure 01 , and a hoisting tool can utilize the hoisting hole 014 to hoist and transport the prefabricated bottom structure 01 .

[0044] A plurality of connecting steel bars 07 are embedded in two opposite sides of the prefabricated bottom structure 01, and one end of the connecting steel bar 07 away from the prefabricated bottom structure 01 is cast in the concrete mounting block 02; the connecting steel bar 07 can be reliably connected to the prefabricated bottom structure 01 and the concrete mounting block 02.

[0045] A construction process for a local prefabricated bottom structure of a railway tunnel using a drill and blast method, the process steps are as follows:

[0046] ① Excavate the tunnel and apply initial support 08;

[0047] ② Carry out cross-sectional quality inspection on the tunnel invert, i.e., inspect whether the surface of the invert can match the bottom shape and size of the prefabricated bottom structure 01, and lay the concrete cushion 05 to ensure that when the prefabricated bottom structure 01 is installed, the end surface of the prefabricated bottom structure 01 can be stably arranged vertically, and multiple prefabricated bottom structure 01 can be accurately installed in sequence along the length direction of the tunnel;

[0048] ③ Move the prefabricated bottom structure 01 into the tunnel through a mobile carrier and install it. Use a hoist to hoist and transfer the prefabricated bottom structure 01 and adjust its position to ensure that the top surfaces and side surfaces of multiple prefabricated bottom structure 01 are aligned;

[0049] ④ Install bolts and nuts to tighten the multiple prefabricated bottom structural members 01 along the length direction of the tunnel so that the multiple prefabricated bottom structural members 01 can be reliably tightened;

[0050] ⑤ Inject self-compacting concrete between the bottom surface of the prefabricated bottom structure 01 and the concrete cushion 05 through the grouting hole 012, and fill the gap between the bottom surface of the prefabricated bottom structure 01 and the concrete cushion 05 with the self-compacting concrete. The multiple prefabricated bottom structure 01 can stably and evenly apply pressure to the tunnel invert;

[0051] ⑥ Set up a formwork for pouring concrete installation block 02, and pour concrete installation block 02;

[0052] ⑦ After the initial setting of the concrete installation block 1 02, the template for limiting the position of the concrete installation block 1 02 in step ⑥ is removed, and a template for pouring the concrete installation block 2 03 is set up, and then the concrete installation block 2 03 is poured;

[0053] ⑧ After the initial setting of the concrete installation block 203, the template for limiting the concrete installation block 203 in step 7 is removed, and the template for pouring the tunnel drainage and cable trough 04 is set up, and then the tunnel drainage and cable trough 04 are poured;

[0054] ⑨ After the tunnel drainage and cable trough 04 is initially solidified, the template used to limit the tunnel drainage and cable trough 04 in step ⑧ is removed, and the cast-in-place construction of the tunnel arch wall 06 is carried out to ensure that the two concrete mounting blocks 02 are reliably connected to the tunnel arch wall 06.

[0055] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0056] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A local prefabricated bottom structure of a railway tunnel using the drill and blast method, characterized in that: include: A prefabricated bottom structure (01), a concrete installation block 1 (02), a concrete installation block 2 (03), and a tunnel drainage and cable trough (04). The prefabricated bottom structure (01) is provided with a plurality of prefabricated bottom structures and arranged in sequence along the length direction of the tunnel. The prefabricated bottom structure (01) is provided with tension holes (010) and through holes (011) penetrating its end surface. The hole length directions of the tension holes (010) and the through holes (011) are both the same as the length direction of the tunnel. One end of the bolt is screwed with a nut after passing through a plurality of tension holes (010) that are directly opposite to each other along the length direction of the tunnel. A grouting hole (012) penetrating the bottom surface of the prefabricated bottom structure (01) is provided on the hole wall of the through hole (011). The bottom surface of the prefabricated bottom structure (01) is adapted to the shape and size of the tunnel invert. A plurality of through holes (011) are provided between the bottom surface of the prefabricated bottom structure (01) and the tunnel invert from top to bottom. There are self-compacting concrete and a concrete cushion layer (05); two concrete mounting blocks (02) are provided and are arranged on two opposite sides of the prefabricated bottom structure (01); one end of the two concrete mounting blocks (02) is respectively connected to the two opposite sides of the prefabricated bottom structure (01); the other ends of the two concrete mounting blocks (02) are connected to the tunnel arch wall (06); two concrete mounting blocks (03) are provided and are arranged on two opposite sides of the prefabricated bottom structure (01); each concrete mounting block (03) is simultaneously connected to the prefabricated bottom structure (01) and the concrete mounting block (02); two tunnel drainage and cable troughs (04) are provided and are respectively arranged on two opposite sides of the prefabricated bottom structure (01); the tunnel drainage and cable troughs (04) are simultaneously connected to the concrete mounting block (02) and the concrete mounting block (03).

2. The local prefabricated bottom structure of a railway tunnel using the drill and blast method according to claim 1, characterized in that: The prefabricated bottom structure (01) is provided with weight-reducing holes (013) penetrating through both end surfaces thereof, and the weight-reducing holes (013) are provided in plurality and are arranged symmetrically about the center line of the through hole (011); and a hoisting hole (014) connected to the weight-reducing hole (013) is provided on the top surface of the prefabricated bottom structure (01).

3. The local prefabricated bottom structure of a railway tunnel using the drill and blast method according to claim 1, characterized in that: A plurality of connecting steel bars (07) are pre-buried on two opposite sides of the prefabricated bottom structure (01), and one end of the connecting steel bars (07) away from the prefabricated bottom structure (01) is cast in the concrete installation block 1 (02).

4. A construction process for a local prefabricated bottom structure of a railway tunnel using a drill and blast method, characterized in that: A local prefabricated bottom structure of a railway tunnel using a drill and blast method as described in any one of claims 1 to 3 is prepared, wherein the process steps are as follows: ① Excavate the tunnel and provide initial support (08); ② Performing a cross-sectional quality inspection on the tunnel invert and laying the concrete cushion layer (05) to ensure that the plurality of prefabricated bottom structural members (01) can be accurately installed in sequence along the length direction of the tunnel; ③ moving the prefabricated bottom structure (01) into the tunnel and installing it, ensuring that the top surfaces and side surfaces of the plurality of prefabricated bottom structure (01) are aligned with each other; ④ installing the bolts and the nuts to tighten the plurality of prefabricated bottom structural members (01) along the length direction of the tunnel; ⑤ injecting the self-compacting concrete between the bottom surface of the prefabricated bottom structure (01) and the concrete cushion layer (05) through the grouting hole (012); ⑥ Casting of the concrete installation block 1 (02); ⑦ After the concrete installation block 1 (02) is initially set, the concrete installation block 2 (03) is poured; ⑧ After the concrete installation block 2 (03) is initially set, the tunnel drainage and cable trough (04) is poured; ⑨ Carry out cast-in-place construction of the tunnel arch wall (06) to ensure that the two concrete installation blocks (02) are connected to the tunnel arch wall (06).

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