Drilling and blasting method railway tunnel integrated prefabricated bottom structure and construction method thereof

Abstract

The invention discloses a drilling and blasting method railway tunnel integrated prefabricated bottom structure and a construction method thereof. The drilling and blasting method railway tunnel integrated prefabricated bottom structure comprises a plurality of bottom structural parts, and the adjacent bottom structural parts are clamped through clamping protrusions and clamping grooves; limiting grooves and steel bars are arranged on the top face of the bottom structural part, and prefabricated grooves are embedded in the limiting grooves. A grouting groove is formed in the bottom face of the bottom structural part, a through hole is formed in the bottom structural part, grouting holes are formed in the hole wall of the through hole, and the space between the bottom face of the bottom structural part and an inverted arch of the tunnel is filled with self-compacting concrete. The bottom structural parts are firstly installed, then the tunnel arch wall is constructed, and finally the prefabricated grooves are installed. The bottom structure of the tunnel is formed by clamping the multiple bottom structural parts, the integrity of the bottom structure of the tunnel is good, and the inverted arch of the tunnel is evenly stressed; the construction process of the tunnel bottom structure is simple, the construction steps are few, and the construction efficiency of the tunnel bottom structure is greatly improved while the construction quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of tunnel structure construction, and more particularly to an integrated prefabricated bottom structure of a railway tunnel using a drill and blast method and a construction method thereof. Background Art

[0002] After tunnel excavation using the drilling and blasting method, further structural construction is required in the tunnel, including initial support of the tunnel, tunnel arch wall and tunnel bottom structure. The above construction requires a large amount of labor, and most of the structures in the tunnel are cast on site, so the construction period is long. When constructing the bottom structure of the tunnel, it involves steel bar binding, mold support, and casting or installation of cable troughs and drainage ditches. The construction quality is unstable, which may cause uneven force on the invert arch. After a period of time, the bottom structure of the tunnel may crack, sink, and experience mud and other defects.

[0003] Therefore, how to provide an integrated prefabricated bottom structure for a railway tunnel using a drill and blast method and a construction method thereof so as to overcome the above-mentioned problems is an issue that needs to be urgently addressed by those skilled in the art. Summary of the invention

[0004] In view of this, the present invention provides an integrated prefabricated bottom structure of a railway tunnel using a drill and blast method and a construction method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A prefabricated bottom structure of a railway tunnel using a drill and blast method, comprising: a bottom structure member, wherein the bottom structure member is provided with a plurality of bottom structure members and arranged in sequence along the length direction of the tunnel, and the two end surfaces of the bottom structure member are respectively provided with a clamping protrusion and a clamping groove, and the clamping protrusions adjacent to each other along the length direction of the tunnel are clamped with the clamping grooves; a top surface of the bottom structure member is provided with a limiting groove and a steel bar for connecting with a tunnel arch wall, the limiting groove passes through the two end surfaces of the bottom structure member, and a prefabricated groove can be embedded in the limiting groove; a grouting groove is provided on the bottom surface of the bottom structure member, and the grouting groove passes through the two end surfaces of the bottom structure member, a through hole passing through the two end surfaces of the bottom structure member is provided on the bottom structure member, and a grouting hole connected with the grouting groove is opened on the hole wall of the through hole, the bottom surface of the bottom structure member is adapted to the shape and size of the tunnel invert, and the space between the bottom surface of the bottom structure member and the tunnel invert is filled with self-compacting concrete.

[0007] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses an integrated prefabricated bottom structure of a railway tunnel using the drill and blast method. In the present invention, the bottom structure of the tunnel is composed of a plurality of bottom structural members arranged in sequence along the length direction of the tunnel, and adjacent bottom structural members are clamped together by clamping protrusions and clamping grooves. The bottom structure of the tunnel has good integrity, so that the invert of the tunnel is evenly stressed; the bottom structural member is provided with a grouting groove, and self-compacting concrete can be quickly and evenly filled between the bottom structural member and the invert of the tunnel through the grouting hole to ensure that the bottom structural member and the invert of the tunnel are reliably connected.

[0008] Preferably, a hoisting hole communicating with the through hole is provided on the top surface of the bottom structure. This design facilitates hoisting and transportation of the bottom structure.

[0009] Preferably, a waterproof sealing belt closed end to end is tightly arranged between each two adjacent bottom structural members, and the through hole is limited inside the waterproof sealing belt. The gap between each two adjacent bottom structural members will not leak or seep water.

[0010] Preferably, the grouting groove includes a plurality of grooves 1 and a plurality of grooves 2, the length direction of the groove 1 is the same as the width direction of the bottom structure, the length direction of the groove 2 is the same as the length direction of the bottom structure, the plurality of grooves 1 are arranged equidistantly in sequence along the length direction of the bottom structure, the plurality of grooves 2 are arranged equidistantly in sequence along the width direction of the bottom structure, the groove 2 runs through the two end faces of the bottom structure, the plurality of grooves 1 are connected to the plurality of grooves 2, and the grouting holes are provided with a plurality and are connected to the grooves 1 and 2 at the same time. Self-compacting concrete can be quickly and evenly filled between the bottom structure and the invert.

[0011] Preferably, the grouting groove further includes a plurality of grooves three, and grooves three are provided on both sides of the bottom structure, one end of the groove three is connected to the groove one, and the other end passes through the top surface of the bottom structure. The bottom structure can be reliably fixed in the tunnel.

[0012] Preferably, the limiting groove includes a first installation groove, a through groove and a second installation groove arranged in sequence along the width direction of the bottom structure, and the first installation groove, the through groove and the second installation groove all penetrate the two end surfaces of the bottom structure; the prefabricated groove includes a cable groove and a groove prefabricated part, the groove length direction of the cable groove and the length direction of the groove prefabricated part are both the same as the length direction of the bottom structure, the first installation groove is embedded with the cable groove, the second installation groove is embedded with the groove prefabricated part, and an outer side wall of the cable groove, the through groove and the groove prefabricated part can jointly define a tunnel drainage groove. The prefabricated groove can be quickly and reliably installed on the bottom structure.

[0013] A construction method for an integrated prefabricated bottom structure of a railway tunnel using a drill and blast method, the method being as follows:

[0014] ① Excavate the tunnel and provide initial support;

[0015] ② installing the bottom structure in the tunnel, and injecting the self-compacting concrete between the bottom surface of the bottom structure and the invert of the tunnel through the grouting holes;

[0016] ③Construct the tunnel arch wall and embed the steel bar head in the tunnel arch wall;

[0017] ④ After the bottom structural parts are installed, the prefabricated grooves are installed.

[0018] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a construction method for an integrated prefabricated bottom structure of a railway tunnel using the drill and blast method, which has a simple construction process, short construction time and stable construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 It is a schematic diagram of the installation of an integrated prefabricated bottom structure of a railway tunnel using the drill and blast method;

[0021] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 yes Figure 1 The main view of

[0023] Figure 4 It is an axonometric view of the bottom structure of a prefabricated bottom structure of a railway tunnel using the drill and blast method;

[0024] Figure 5 yes Figure 4 The main view of

[0025] Figure 6 yes Figure 4 Bottom view of

[0026] Figure 7 The present invention is a flow chart of a construction method of an integrated prefabricated bottom structure of a railway tunnel using the drill and blast method.

[0027] In the figure:

[0028] 01 is the bottom structural part, 010 is the snap-in protrusion, 011 is the snap-in groove, 012 is the limit groove, 0120 is the installation groove one, 0121 is the through groove, 0122 is the installation groove two, 013 is the grouting groove, 0130 is the groove one, 0131 is the groove two, 0132 is the groove three, 014 is the through hole, 015 is the grouting hole, 016 is the lifting hole, 02 is the steel bar, 03 is the prefabricated groove, 030 is the cable groove, 031 is the groove prefabricated part, 04 is the self-compacting concrete, 05 is the waterproof sealing belt, 06 is the tunnel, 07 is the tunnel arch wall, and 08 is the initial support. DETAILED DESCRIPTION

[0029] 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.

[0030] The present invention discloses an integrated prefabricated bottom structure of a railway tunnel using a drill and blast method and a construction method thereof. In the present invention, the bottom structure of the tunnel is composed of a plurality of bottom structure members 01 sequentially arranged along the length direction of the tunnel, and adjacent bottom structure members 01 are clamped together by clamping protrusions 010 and clamping grooves 011. The bottom structure of the tunnel has good integrity, so that the invert of the tunnel is evenly stressed. The bottom structure member 01 is provided with a grouting groove 013, and self-compacting concrete 04 can be quickly and evenly filled between the bottom structure member 01 and the invert of the tunnel through a grouting hole 015, so as to ensure that the bottom structure member 01 is reliably connected to the invert of the tunnel. The design of the through hole 014 ensures that the bottom structure member 01 meets the strength requirements while The bottom structure 01 is light in weight, which can reduce the pressure on the tunnel invert, and improve the stability and service life of the tunnel bottom structure; the top surface of the bottom structure 01 is provided with a limit groove 012, and the prefabricated groove 03 can be installed on the limit groove 012. This design can simplify the construction process of the tunnel bottom structure, shorten the construction time, and the construction quality of the tunnel bottom structure and the prefabricated groove 03 is stable; by providing a waterproof sealing belt 05, the gap between adjacent bottom structure members 01 will not leak; the tunnel arch wall 06 and the bottom structure 01 can be reliably connected and fixed; the construction process of the tunnel bottom structure is simple, the construction steps are few, and while ensuring the construction quality, the construction efficiency of the tunnel bottom structure is greatly improved.

[0031] Example

[0032] See attached Figure 1-7The whole and part of the structure schematic diagram of an embodiment of the present invention, the present invention specifically discloses an integrated prefabricated bottom structure of a railway tunnel using a drilling and blasting method, the tunnel is excavated using a drilling and blasting method, and then the bottom structure is constructed;

[0033] The integrated prefabricated bottom structure comprises: a plurality of bottom structural members 01, which are arranged in sequence along the length direction of the tunnel, the length direction of the bottom structural member 01 being the same as the length direction of the tunnel, and a plurality of clamping protrusions 010 and clamping grooves 011 are respectively arranged on both end surfaces of the bottom structural member 01, and the adjacent clamping protrusions 010 and clamping grooves 011 along the length direction of the tunnel are clamped, that is, every two adjacent bottom structural members 01 along the length direction of the tunnel can be reliably fixed together;

[0034] The top surface of the bottom structure 01 is provided with a limiting groove 012 and a steel bar 02 for connecting with the tunnel arch wall 06. The steel bars 02 are divided into two groups and are arranged close to both sides of the bottom structure 01. Two limiting grooves 012 are provided and are located between the two groups of steel bars 02. The limiting grooves 012 pass through both end surfaces of the bottom structure 01. The prefabricated grooves 03 can be embedded in the limiting grooves 012.

[0035] The bottom surface of the bottom structure 01 is provided with a grouting groove 013, and the grouting groove 013 passes through the two end surfaces of the bottom structure 01. The bottom structure 01 is provided with a through hole 014 passing through the two end surfaces thereof, and a grouting hole 015 connected with the grouting groove 013 is opened on the hole wall of the through hole 014. The bottom surface of the bottom structure 01 is adapted to the shape and size of the tunnel invert, and there is a gap between the bottom surface of the bottom structure 01 and the tunnel invert. The grouting hole 015 can be used to fill the self-compacting concrete 04 into the gap. The design of the grouting groove 013 aims to ensure that the gap can be evenly filled with the self-compacting concrete 04, and the self-compacting concrete 04 can reliably fix the bottom structure 01 and the tunnel invert together.

[0036] The top surface of the bottom structure 01 is provided with a lifting hole 016 connected to the through hole 014. The lifting hole 016 can be connected to the lifting rope of the crane. The crane can lift and transfer the bottom structure 01 through the lifting hole 016. The bottom structure 01 can be smoothly adjusted in position, which is convenient for the assembly of the bottom structure 01.

[0037] A waterproof sealing belt 05 closed end to end is tightly arranged between every two adjacent bottom structural members 01 , so that water in the tunnel will not enter between two adjacent bottom structural members 01 , and water will not accumulate in the through hole 014 .

[0038] The grouting groove 013 includes a plurality of grooves 0130 and a plurality of grooves 0131. The length direction of the grooves 0130 is the same as the width direction of the bottom structure 01, and the length direction of the grooves 0131 is the same as the length direction of the bottom structure 01. The plurality of grooves 0130 are arranged equidistantly in sequence along the length direction of the bottom structure 01, and the plurality of grooves 0131 are arranged equidistantly in sequence along the width direction of the bottom structure 01. The grooves 0131 penetrate the two end surfaces of the bottom structure 01. The plurality of grooves 0130 and the plurality of grooves 0131 are interconnected. A plurality of grouting holes 015 are provided and are simultaneously connected with the grooves 0130 and the grooves 0131. When grouting is performed, the gap formed between the bottom surface of the bottom structure 01 and the invert of the tunnel can be quickly and evenly filled with the self-compacting concrete 04. The self-compacting concrete 04 in this embodiment is an early high-strength self-compacting concrete with a fast hardening speed.

[0039] The grouting groove 013 also includes a plurality of grooves three 0132. Grooves three 0132 are provided on both sides of the bottom structural member 01. One end of the groove three 0132 is connected to the groove one 0130, and the other end passes through the top surface of the bottom structural member 01. During grouting, the self-compacting concrete 04 can enter the groove three 0132, and the bottom structural member 01 can be reliably fixed in the tunnel. At the same time, during grouting, whether the self-compacting concrete 04 overflows from the upper end of the groove three 0132 can be observed to determine whether the grouting is completed.

[0040] The limiting groove 012 includes a mounting groove 1 0120, a through groove 0121 and a mounting groove 2 0122 which are sequentially arranged along the width direction of the bottom structure 01. The mounting groove 1 0120, the through groove 0121 and the mounting groove 2 0122 all penetrate the two end surfaces of the bottom structure 01.

[0041] The prefabricated groove 03 includes a cable groove 030 and a groove prefabricated part 031. The groove length direction of the cable groove 030 and the length direction of the groove prefabricated part 031 are both the same as the length direction of the bottom structure 01. The cable groove 030 is embedded in the installation groove 1 0120, and the groove prefabricated part 031 is embedded in the installation groove 2 0122. An outer wall of the cable groove 030, the through groove 0121 and the groove prefabricated part 031 can jointly define a tunnel drainage groove; when multiple bottom structures 01 are installed, the cable groove 030 and the groove prefabricated part 031 are installed. The length value of the cable groove 030 and the length value of the groove prefabricated part 031 are several times the width value of a single bottom structure 01.

[0042] A weight-reducing hole is provided on the bottom structure 01 . There are two through holes 014 . The weight-reducing hole is centrally arranged between the two through holes 014 . While ensuring that the strength of the bottom structure 01 meets the requirements, the weight of the bottom structure 01 is relatively light.

[0043] The present invention also specifically discloses a construction method for an integrated prefabricated bottom structure of a railway tunnel using a drill and blast method, the method being as follows:

[0044] ① Excavate the tunnel and apply initial support 07;

[0045] ② The bottom structure 01 is brought into the site, that is, the prefabricated bottom structure 01 is transported to the tunnel; the crane is in place, and the bottom structure 01 is assembled by the crane. When the bottom structure 01 is installed in place, the template is set up, and the board surface of the template is close to the end surface of the bottom structure 01, and the side surface of the template is close to the inverted arch of the tunnel. After the template is set up, the self-compacting concrete 04 is injected into the space between the bottom surface of the bottom structure 01 and the inverted arch of the tunnel through the grouting hole 015. Due to the existence of the template, the self-compacting concrete 04 will not overflow from the end of the bottom structure 01, ensuring that the space between the bottom surface of the bottom structure 01 and the inverted arch of the tunnel can be evenly filled with the self-compacting concrete 04;

[0046] ③ After the bottom structure 01 is installed and the self-compacting concrete 04 is solidified, the through grooves 0121 are waterproofed to ensure that the gaps between adjacent through grooves 0121 will not leak; then, the tunnel arch wall 06 is cast in situ with concrete, and the heads of the steel bars 02 are pre-embedded in the tunnel arch wall 06;

[0047] ④After the installation of the bottom structure 01 is completed, the prefabricated groove 03 is installed.

[0048] 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.

[0049] 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. An integrated prefabricated bottom structure for a railway tunnel using drill and blast method, characterized in that: include: A bottom structure (01), wherein the bottom structure (01) is provided with a plurality of bottom structure members (01) and arranged in sequence along the length direction of the tunnel, and each of the two end surfaces of the bottom structure member (01) is provided with a clamping protrusion (010) and a clamping groove (011), and the clamping protrusions (010) and the clamping grooves (011) adjacent to each other along the length direction of the tunnel are clamped together; and a limiting groove (012) and a steel bar (02) for connecting to a tunnel arch wall (06) are provided on the top surface of the bottom structure member (01), and the limiting groove (012) passes through the two end surfaces of the bottom structure member (01), and a steel bar (02) for connecting to a tunnel arch wall (06) can be provided in the limiting groove (012). The bottom structure (01) is provided with a grouting groove (013), the grouting groove (013) passes through the two end surfaces of the bottom structure (01), the bottom structure (01) is provided with a through hole (014) passing through the two end surfaces, and a grouting hole (015) connected to the grouting groove (013) is opened on the hole wall of the through hole (014), the bottom surface of the bottom structure (01) is adapted to the shape and size of the tunnel invert, and the space between the bottom surface of the bottom structure (01) and the tunnel invert is filled with self-compacting concrete (04).

2. The integrated prefabricated bottom structure of a railway tunnel using drill and blast method according to claim 1, characterized in that: The top surface of the bottom structural member (01) is provided with a hanging hole (016) which is in communication with the through hole (014).

3. The integrated prefabricated bottom structure of a railway tunnel using drill and blast method according to claim 1, characterized in that: A waterproof sealing belt (05) closed end to end is tightly arranged between each two adjacent bottom structural members (01), and the through hole (014) is limited inside the waterproof sealing belt (05).

4. The integrated prefabricated bottom structure of a railway tunnel using drill and blast method according to claim 1, characterized in that: The grouting groove (013) comprises a plurality of groove one (0130) and a plurality of groove two (0131); the length direction of the groove one (0130) is the same as the width direction of the bottom structure (01); the length direction of the groove two (0131) is the same as the length direction of the bottom structure (01); the plurality of groove one (0130) is arranged in sequence and equidistantly along the length direction of the bottom structure (01); the plurality of groove two (0131) is arranged in sequence and equidistantly along the width direction of the bottom structure (01); the groove two (0131) passes through both end surfaces of the bottom structure (01); the plurality of groove one (0130) and the plurality of groove two (0131) are connected to each other; and the grouting hole (015) is provided with a plurality of grooves and is connected to the groove one (0130) and the groove two (0131) at the same time.

5. The integrated prefabricated bottom structure of a railway tunnel using drill and blast method according to claim 4, characterized in that: The grouting groove (013) also includes a plurality of groove threes (0132), and groove threes (0132) are provided on both side surfaces of the bottom structural member (01), one end of the groove three (0132) is connected to the groove one (0130), and the other end passes through the top surface of the bottom structural member (01).

6. The integrated prefabricated bottom structure of a railway tunnel using drill and blast method according to claim 1, characterized in that: The limiting groove (012) comprises a first installation groove (0120), a through groove (0121) and a second installation groove (0122) which are sequentially arranged along the width direction of the bottom structure (01), and the first installation groove (0120), the through groove (0121) and the second installation groove (0122) all penetrate the two end surfaces of the bottom structure (01); the prefabricated groove (03) comprises a cable groove (030) and a groove prefabricated part (031), and the cable groove (030) and the prefabricated groove (031) are provided with a plurality of prefabricated grooves (031). The length direction of the cable trough (030) and the length direction of the groove preform (031) are both the same as the length direction of the bottom structure (01); the cable trough (030) is embedded in the first installation groove (0120); the groove preform (031) is embedded in the second installation groove (0122); an outer side wall of the cable trough (030), the through groove (0121) and the groove preform (031) can jointly define a tunnel drainage groove.

7. A construction method for an integrated prefabricated bottom structure of a railway tunnel using a drill and blast method, characterized in that: The integrated prefabricated bottom structure of a railway tunnel using a drill and blast method as claimed in any one of claims 1 to 6 is as follows: ① Excavate the tunnel and provide initial support (07); ② installing the bottom structure (01) in the tunnel, and injecting the self-compacting concrete (04) between the bottom surface of the bottom structure (01) and the invert of the tunnel through the grouting hole (015); ③ constructing the tunnel arch wall (06) and pre-embedding the head of the steel bar (02) in the tunnel arch wall (06); ④ After the bottom structure (01) is installed, the prefabricated groove (03) is installed.

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