CN209908512U - Tunnel portal open cut section fabricated lining structure - Google Patents
Tunnel portal open cut section fabricated lining structure Download PDFInfo
- Publication number
- CN209908512U CN209908512U CN201920293513.4U CN201920293513U CN209908512U CN 209908512 U CN209908512 U CN 209908512U CN 201920293513 U CN201920293513 U CN 201920293513U CN 209908512 U CN209908512 U CN 209908512U
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- lining
- arc
- shaped
- precast block
- base
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
- 239000004587 polysulfide sealant Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Lining And Supports For Tunnels (AREA)
Abstract
The utility model discloses a tunnel portal open cut section assembled lining cutting structure has solved the assembly difficulty that current tunnel portal open cut section assembled lining cutting structure exists, and the weak and whole arch lining cutting poor stability's of seam crossing shear strength problem. Including the entrance to a cave open cut section face upward archway (1), left lining arc prefabricated section (4) and right lining arc prefabricated section (5), constitute tunnel entrance to a cave arch lining structure after left lining arc prefabricated section (4) splices with right lining arc prefabricated section (5), through setting up arc lining base, and with this seat pre-buried to in the face of an arch, and expose the top of arc lining base to the top of face of an arch, set up buffer spring between the both sides bottom of arc lining block and arc lining base, in the U-shaped groove of overlap joint, reserve the resistance to shear steel bar of being connected with two interior steel skeleton of arc lining block, weld the resistance to shear steel bar of two reservations in concatenation department, thereby the stability of the whole lining of arch is greatly improved.
Description
Technical Field
The invention relates to a lining structure of an open cut section of a tunnel portal, in particular to an assembled lining structure of the open cut section of the tunnel portal formed by assembling prefabricated arc-shaped lining plates and an assembling method thereof.
Background
In the excavation construction of the tunnel, a tunnel portal is excavated and formed in an open excavation mode, after the portal is temporarily supported and reinforced, excavation and support construction of a tunnel body part (namely a blind hole) are carried out, and after the support structure of the blind hole body section is completely constructed, cast-in-place construction and concrete maintenance of a gradual change section of the portal, the open hole and a portal lining are carried out, and the construction process has the defect of overlong operation period; in the prior art, technicians in the field also try to assemble a tunnel portal lining at a tunnel portal by using prefabricated and molded assembled arc-shaped lining plates, namely, after an open excavation section of the tunnel portal is excavated, one-time supporting of the tunnel portal is carried out by the prefabricated and molded lining plates, the prefabricated lining plates are assembled into an arch portal by a plurality of prefabricated and molded arc-shaped lining plates, the bottom surface of the tunnel portal is an inverted arch surface, the bottom ends of two sides of the prefabricated and molded arc-shaped lining plates are arranged on the inverted arch surface, and due to the fact that the inverted arch surface is uneven, the phenomenon that the connection of the two bottom end surfaces of the arch lining and the inverted arch surface is not matched is caused, and secondary leveling treatment needs to be carried out on the connection surface; in addition, the arc-shaped lining plate has errors in the prefabricating process, can not be assembled in place at one time in the assembling process and needs to be adjusted, but the arc-shaped lining plate and the inverted arch surface are rigidly combined, so that the problem of difficult adjustment exists in the assembling process; the assembly of the top connection part of the existing assembled arc-shaped lining plate is generally spliced together in a mortise-tenon slot mode, the problems of high assembly process requirement precision and difficult realization of top alignment exist, and particularly, the defects of weak shear strength at the joint and poor integral stability of the arc-shaped lining caused by the fact that reinforcing steel bars of two assembled arc-shaped lining plates are isolated and disconnected with each other are overcome.
Disclosure of Invention
The invention provides an open cut section fabricated lining structure of a tunnel portal, which solves the technical problems of difficult assembly, weak shear strength at a joint and poor stability of an integral arched lining of the existing open cut section fabricated lining structure of the tunnel portal.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the cast-in-place process adopted by the traditional lining of the opening open cut section is changed into a prefabrication process, firstly, arc lining blocks are prefabricated, and then, the opening open cut section is assembled and molded; the arc lining base is arranged, the base is embedded into the inverted arch surface, the top surface of the arc lining base is exposed above the inverted arch surface, and the buffer springs are arranged between the bottom ends of the two sides of the arc lining block and the arc lining base, so that the problem of high assembly difficulty when the arc lining block is assembled and butted to form an arch opening lining is solved; the arch opening lining is formed by splicing two sections of arc lining blocks, the splicing position at the top is spliced by adopting a lap joint mode, a U-shaped groove is formed at the lap joint position, anti-shearing reinforcing steel bars connected with reinforcing steel frameworks in the two arc lining blocks are reserved in the U-shaped groove at the lap joint position, and the two reserved anti-shearing reinforcing steel bars are welded at the splicing position, so that the stability of the arch integral lining is greatly improved.
A tunnel portal open cut section fabricated lining structure comprises a portal open cut section overhead arch surface, a left lining arc-shaped precast block and a right lining arc-shaped precast block, wherein the left lining arc-shaped precast block is spliced with the right lining arc-shaped precast block to form the tunnel portal arch lining structure; a right assembly and combination step is arranged on the right prefabricated lining base, and right base spring embedding grooves are distributed on the lower step of the right assembly and combination step at equal intervals along the longitudinal direction of the tunnel; the bottom end face of the left lining arc-shaped precast block is provided with spring embedding grooves at equal intervals along the longitudinal direction of the tunnel, and the arch crown joint surface of the left lining arc-shaped precast block is provided with an upper lapping tongue; a spring embedding groove is formed in the bottom end face of the right arc-shaped block at equal intervals along the longitudinal direction of the tunnel on the bottom end face of the right lining arc-shaped precast block, and a lower lapping tongue is arranged on the arch crown joint face of the right lining arc-shaped precast block; the upper lapping tongue on the left lining arc-shaped precast block is lapped on the lower lapping tongue on the right lining arc-shaped precast block; pre-embedding a left lining arc-shaped precast block pre-embedding connecting steel bar on the vault combining end surface of the left lining arc-shaped precast block, and pre-embedding a right lining arc-shaped precast block pre-embedding connecting steel bar on the vault combining end surface of the right lining arc-shaped precast block; the left lining arc-shaped precast block is arranged on a lower step of a left assembling combination step arranged on the top surface of the left prefabricated lining base, the right lining arc-shaped precast block is arranged on a lower step of a right assembling combination step arranged on the right prefabricated lining base, a left assembling buffer spring is arranged between the left base spring embedding groove and the left arc-shaped block bottom end face spring embedding groove, and a right assembling buffer spring is arranged between the right base spring embedding groove and the right arc-shaped block bottom end face spring embedding groove; a U-shaped groove is formed in the central axis of the top end face of an arc-shaped lining structure body formed after the left lining arc-shaped precast block and the right lining arc-shaped precast block are in lap joint, and left lining arc-shaped precast block embedded connecting steel bars and right lining arc-shaped precast block embedded connecting steel bars which are welded together are arranged in the U-shaped groove.
The U-shaped groove is closely attached with a water stop strip, and the U-shaped groove is filled with filling concrete; and cable grooves are prefabricated on the inner sides of the left prefabricated lining base and the right prefabricated lining base.
The invention abandons the traditional cast-in-place construction method of tunnel portal lining, and overcomes the defects of weak shear strength at the joint and poor integral stability of the arched lining of the prefabricated spliced portal arch lining; the prefabricated lining bases are pre-embedded on the inverted arch surfaces at two sides of the tunnel, so that the defects that the two bottom end surfaces of the prefabricated arch lining are not matched with the inverted arch surfaces in a connection mode and the bottom ends of the arc lining blocks are combined with the inverted arch surfaces and cannot be assembled in place at one time are overcome; the prefabricated lining base and the arc-shaped prefabricated lining blocks are supported and cushioned by assembling the buffer springs between the prefabricated lining base and the arc-shaped prefabricated lining blocks, so that the difficulty of assembling the two arc-shaped lining blocks in place is reduced, the reserved steel bars of the two arc-shaped lining blocks are welded together, and the stability of the whole arch-shaped lining structure is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial enlarged view of portion A of FIG. 1;
FIG. 3 is a schematic structural view in cross section of the present invention;
FIG. 4 is a partial enlarged view of the portion B in FIG. 3;
figure 5 is a schematic view of the structure of the left prefabricated lining bedplate 2 according to the invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a tunnel portal open cut section fabricated lining structure comprises a portal open cut section inverted arch surface 1, a left lining arc precast block 4 and a right lining arc precast block 5, wherein the left lining arc precast block 4 is spliced with the right lining arc precast block 5 to form the tunnel portal open cut section fabricated lining structure, a left prefabricated lining base 2 and a right prefabricated lining base 3 are respectively pre-embedded in the portal open cut section inverted arch surface 1, the structure of the left prefabricated lining base 2 is the same as that of the right prefabricated lining base 3, a left assembled and combined step 18 is arranged on the top surface of the left prefabricated lining base 2, and left base spring embedded grooves 15 are distributed on the lower step of the left assembled and combined step 18 at equal intervals along the longitudinal direction of a tunnel; a right assembly and combination step 22 is arranged on the right prefabricated lining base 3, and right base spring embedding grooves 19 are arranged on the lower step of the right assembly and combination step 22 at equal intervals along the longitudinal direction of the tunnel; spring embedding grooves 17 are formed in the bottom end face of the left arc-shaped block at equal intervals along the longitudinal direction of the tunnel on the bottom end face of the left lining arc-shaped precast block 4, and an upper lapping tongue 6 is arranged on the arch crown junction face of the left lining arc-shaped precast block 4; the bottom end face of the right lining arc-shaped precast block 5 is provided with spring embedding grooves 21 at equal intervals along the longitudinal direction of the tunnel, and a lower lapping tongue 7 is arranged on the vault combining surface of the right lining arc-shaped precast block 5; an upper lapping tongue 6 on the left lining arc-shaped precast block 4 is lapped on a lower lapping tongue 7 on the right lining arc-shaped precast block 5; the arch crown combination end face of the left lining arc-shaped precast block 4 is pre-embedded with a left lining arc-shaped precast block pre-embedded connecting reinforcing steel bar 8, and the arch crown combination end face of the right lining arc-shaped precast block 5 is pre-embedded with a right lining arc-shaped precast block pre-embedded connecting reinforcing steel bar 9; the left lining arc-shaped precast block 4 is arranged on a lower step of a left assembling and combining step 18 arranged on the top surface of the left prefabricated lining base 2, the right lining arc-shaped precast block 5 is arranged on a lower step of a right assembling and combining step 22 arranged on the right prefabricated lining base 3, a left assembling buffer spring 16 is arranged between the left base spring embedded groove 15 and the left arc-shaped block bottom end face spring embedded groove 17, and a right assembling buffer spring 20 is arranged between the right base spring embedded groove 19 and the right arc-shaped block bottom end face spring embedded groove 21; a U-shaped groove 10 is formed in the central axis of the top end face of an arc-shaped lining structure body formed after the left lining arc-shaped precast block 4 and the right lining arc-shaped precast block 5 are in lap joint, and a left lining arc-shaped precast block embedded connecting steel bar 8 and a right lining arc-shaped precast block embedded connecting steel bar 9 which are welded together are arranged in the U-shaped groove 10.
A water stop strip 11 is closely attached to the U-shaped groove 10, and filling concrete 12 is poured into the U-shaped groove 10; cable channels 23 are prefabricated on both the inside of the left prefabricated lining base 2 and the inside of the right prefabricated lining base 3.
A construction method of a tunnel open cut tunnel section assembled lining structure comprises the following steps:
firstly, prefabricating a left prefabricated lining base 2 and a right prefabricated lining base 3 in a prefabrication factory, wherein the left prefabricated lining base 2 and the right prefabricated lining base 3 are identical in structure, the left prefabricated lining base 2 is cuboid, and a left assembling and combining step 18 is arranged on the top surface of the left prefabricated lining base 2; on the lower step of the left assembling combination step 18, along the longitudinal direction of the tunnel, left base spring embedding grooves 15 are arranged at equal intervals, and left assembling buffer springs 16 are embedded in the left base spring embedding grooves 15; a right assembly and combination step 22 is arranged on the right prefabricated lining base 3, a right base spring embedding groove 19 is arranged on the lower step of the right assembly and combination step 22 at equal intervals along the longitudinal direction of the tunnel, a right assembly buffer spring 20 is embedded in the right base spring embedding groove 19, and cable grooves 23 are prefabricated on the inner side of the left prefabricated lining base 2 and the inner side of the right prefabricated lining base 3.
Secondly, prefabricating a left lining arc-shaped precast block 4 and a right lining arc-shaped precast block 5 in a prefabrication plant, and splicing the left lining arc-shaped precast block 4 and the right lining arc-shaped precast block 5 to form an arch lining structure of the tunnel portal; spring embedding grooves 17 are formed in the bottom end face of the left arc-shaped block at equal intervals along the longitudinal direction of the tunnel on the bottom end face of the left lining arc-shaped precast block 4, and an upper lapping tongue 6 is arranged on the arch crown junction face of the left lining arc-shaped precast block 4; the bottom end face of the right lining arc-shaped precast block 5 is provided with spring embedding grooves 21 at equal intervals along the longitudinal direction of the tunnel, and a lower lapping tongue 7 is arranged on the vault combining surface of the right lining arc-shaped precast block 5; an upper lapping tongue 6 on the left lining arc-shaped precast block 4 is lapped on a lower lapping tongue 7 on the right lining arc-shaped precast block 5 to form an arch lining of the tunnel portal; the arch crown combination end face of the left lining arc-shaped precast block 4 is pre-embedded with a left lining arc-shaped precast block pre-embedded connecting reinforcing steel bar 8, and the arch crown combination end face of the right lining arc-shaped precast block 5 is pre-embedded with a right lining arc-shaped precast block pre-embedded connecting reinforcing steel bar 9;
thirdly, respectively hoisting the left prefabricated lining base 2 and the right prefabricated lining base 3 into an inverted arch of an open cut tunnel at the tunnel portal to be in place, then pouring inverted arch concrete to form an inverted arch surface 1 of the open cut section of the tunnel portal, and enabling the top end surface of the left prefabricated lining base 2 and the cable trench 23 as well as the top end surface of the right prefabricated lining base 3 and the cable trench 23 to be arranged above the inverted arch surface 1 of the open cut section of the tunnel portal;
fourthly, the left assembling buffer spring 16 is placed into the left base spring embedding groove 15, and the right assembling buffer spring 20 is placed into the right base spring embedding groove 19;
fifthly, hanging the right lining arc-shaped precast block 5 right above the right precast lining base 3 by using a crane, descending the right lining arc-shaped precast block 5 to enable the top end of the right assembling buffer spring 20 to be embedded into a spring embedding groove 21 at the bottom end face of the right arc-shaped block, and continuing descending the right lining arc-shaped precast block 5 to enable the bottom face of the right lining arc-shaped precast block 5 to fall onto an upper step of a right assembling combination step 22;
sixthly, hanging the left lining arc-shaped precast block 4 right above the left precast lining base 2 by using a crane, descending the left lining arc-shaped precast block 4 to enable the top end of a left assembling buffer spring 16 to be embedded into a spring embedding groove 17 at the bottom end face of the left arc-shaped block, enabling the left lining arc-shaped precast block 4 to be supported on the left assembling buffer spring 16 in the assembling process, enabling an upper lapping tongue 6 on the left lining arc-shaped precast block 4 to fall on a lower lapping tongue 7 on the right lining arc-shaped precast block 5, enabling the left lining arc-shaped precast block 4 and the right lining arc-shaped precast block 5 to be butted together by adjusting the vertical and horizontal falling angles of the left lining arc-shaped precast block 4 to form a complete arch lining structure body, forming a U-shaped groove 10 at the central axis of the top end face of the arc-shaped lining structure body, and arranging a left lining arc-shaped precast block embedded connecting steel bar 8 and a right lining arc-shaped precast block embedded steel bar 9 in the U-shaped groove 10, welding a left lining arc-shaped precast block embedded connecting steel bar 8 and a right lining arc-shaped precast block embedded connecting steel bar 9 in the U-shaped groove 10 together;
seventhly, closely attaching a water stop strip 11 in the U-shaped groove 10, then pouring filling concrete 12, reserving a V-shaped groove 13 when the filling concrete 12 is poured, and pouring polysulfide sealant 14 in the V-shaped groove 13 after the filling concrete 12 is finally solidified; and finally, applying a waterproof layer on the complete arch-shaped lining structure.
Claims (2)
1. A tunnel portal open cut section fabricated lining structure comprises a portal open cut section inverted arch surface (1), a left lining arc-shaped precast block (4) and a right lining arc-shaped precast block (5), wherein the left lining arc-shaped precast block (4) is spliced with the right lining arc-shaped precast block (5) to form the tunnel portal open cut arch-shaped lining structure, the tunnel portal open cut section fabricated lining structure is characterized in that a left prefabricated lining base (2) and a right prefabricated lining base (3) are respectively pre-embedded in the portal open cut section inverted arch surface (1), the structure of the left prefabricated lining base (2) is the same as that of the right prefabricated lining base (3), a left assembled and combined step (18) is arranged on the top surface of the left prefabricated lining base (2), and left base spring embedded grooves (15) are uniformly distributed in the longitudinal direction of a tunnel on the lower step of the left assembled and combined step (18); a right assembly and combination step (22) is arranged on the right prefabricated lining base (3), and right base spring embedding grooves (19) are arranged on the lower step of the right assembly and combination step (22) at equal intervals along the longitudinal direction of the tunnel; spring embedding grooves (17) are formed in the bottom end face of the left arc-shaped block at equal intervals along the longitudinal direction of the tunnel on the bottom end face of the left lining arc-shaped precast block (4), and an upper lapping tongue (6) is arranged on the arch crown junction face of the left lining arc-shaped precast block (4); spring embedding grooves (21) are formed in the bottom end face of the right arc-shaped block at equal intervals along the longitudinal direction of the tunnel on the bottom end face of the right lining arc-shaped precast block (5), and a lower lapping tongue (7) is arranged on the arch crown junction face of the right lining arc-shaped precast block (5); an upper lapping tongue (6) on the left lining arc-shaped precast block (4) is lapped on a lower lapping tongue (7) on the right lining arc-shaped precast block (5); the arch top combination end face of the left lining arc-shaped precast block (4) is pre-embedded with a left lining arc-shaped precast block pre-embedded connecting reinforcing steel bar (8), and the arch top combination end face of the right lining arc-shaped precast block (5) is pre-embedded with a right lining arc-shaped precast block pre-embedded connecting reinforcing steel bar (9); a left lining arc-shaped precast block (4) is arranged on a lower step of a left assembling and combining step (18) arranged on the top surface of the left prefabricated lining base (2), a right lining arc-shaped precast block (5) is arranged on a lower step of a right assembling and combining step (22) arranged on the right prefabricated lining base (3), a left assembling buffer spring (16) is arranged between a left base spring embedded groove (15) and a left arc-shaped block bottom end face spring embedded groove (17), and a right assembling buffer spring (20) is arranged between a right base spring embedded groove (19) and a right arc-shaped block bottom end face spring embedded groove (21); a U-shaped groove (10) is formed in the central axis of the top end face of an arc-shaped lining structure body formed after the left lining arc-shaped precast block (4) and the right lining arc-shaped precast block (5) are in lap joint, and left lining arc-shaped precast block embedded connecting steel bars (8) and right lining arc-shaped precast block embedded connecting steel bars (9) which are welded together are arranged in the U-shaped groove (10).
2. The open-cut section fabricated lining structure of a tunnel portal according to claim 1, characterized in that a water stop bar (11) is closely adhered in the U-shaped groove (10), and the U-shaped groove (10) is filled with filling concrete (12); and cable grooves (23) are prefabricated on the inner sides of the left prefabricated lining base (2) and the right prefabricated lining base (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920293513.4U CN209908512U (en) | 2019-03-08 | 2019-03-08 | Tunnel portal open cut section fabricated lining structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920293513.4U CN209908512U (en) | 2019-03-08 | 2019-03-08 | Tunnel portal open cut section fabricated lining structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209908512U true CN209908512U (en) | 2020-01-07 |
Family
ID=69032184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920293513.4U Withdrawn - After Issue CN209908512U (en) | 2019-03-08 | 2019-03-08 | Tunnel portal open cut section fabricated lining structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209908512U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723459A (en) * | 2019-03-08 | 2019-05-07 | 中铁十九局集团第三工程有限公司 | A kind of tunnel portal open excavation section prefbricated tunnel lining structure |
-
2019
- 2019-03-08 CN CN201920293513.4U patent/CN209908512U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723459A (en) * | 2019-03-08 | 2019-05-07 | 中铁十九局集团第三工程有限公司 | A kind of tunnel portal open excavation section prefbricated tunnel lining structure |
| CN109723459B (en) * | 2019-03-08 | 2024-03-05 | 中铁十九局集团第三工程有限公司 | Assembled lining structure of tunnel portal open cut section |
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Granted publication date: 20200107 Effective date of abandoning: 20240305 |
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