CN110792068B - Assembled steel bar segment for quick lining of horseshoe tunnel and assembling method - Google Patents
Assembled steel bar segment for quick lining of horseshoe tunnel and assembling method Download PDFInfo
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- CN110792068B CN110792068B CN201911091181.2A CN201911091181A CN110792068B CN 110792068 B CN110792068 B CN 110792068B CN 201911091181 A CN201911091181 A CN 201911091181A CN 110792068 B CN110792068 B CN 110792068B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 151
- 239000010959 steel Substances 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004873 anchoring Methods 0.000 claims abstract description 84
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 148
- 238000010276 construction Methods 0.000 claims description 31
- 230000002787 reinforcement Effects 0.000 claims description 21
- 239000004567 concrete Substances 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 description 10
- 238000003466 welding Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses an assembled steel bar segment for quick lining of a horseshoe-shaped tunnel, which comprises a capping steel bar mesh block and at least one pair of side wall steel bar mesh blocks, wherein each pair of side wall steel bar mesh blocks are respectively arranged at two ends of the capping steel bar mesh block and form a horseshoe shape with the capping steel bar mesh block, an anchoring part is arranged between the capping block and the side wall block, meanwhile, the assembled method of the steel bar segment is disclosed, the side wall steel bar mesh block is firstly installed, then the capping steel bar mesh block is installed, and the next lining unit is continuously installed after packaging until all lining of the horseshoe-shaped tunnel is completed, so that quick assembly can be directly carried out in the horseshoe-shaped tunnel without on-site bundling, and the assembled method is efficient and convenient.
Description
Technical Field
The invention relates to the technical field of cast-in-place concrete lining of tunnels, in particular to an assembled steel bar segment for quick lining of horseshoe-shaped tunnels and an assembling method.
Background
The horseshoe-shaped tunnel is a common type in the hydraulic tunnel, the construction speed of the horseshoe-shaped tunnel lining has a large influence on the engineering progress and safety, and the constraint lining construction speed is often the binding of the steel bar segments (steel bar net blocks) in the tunnel. At present, the binding and welding of the reinforcing steel bar net blocks of the tunnel lining are carried out in the tunnel, and the binding and welding efficiency of the reinforcing steel bar net blocks is very low under the influence of space and illumination. In addition, dust and smoke generated in the binding and welding processes of a large number of reinforcing bars are difficult to dissipate in the holes, and the health of field workers is seriously endangered.
The Chinese patent No. 201210286548.8 discloses a construction method for binding secondary lining steel bars of a large-span tunnel arch based on a framework beam, wherein the secondary lining steel bars of the bound tunnel arch comprise an outer layer steel bar mesh, an inner layer steel bar mesh and vertical connecting bars for connecting the outer layer steel bar mesh and the inner layer steel bar mesh, and the construction method comprises the following steps: 1. and (3) skeleton beam installation: a plurality of framework beams are arranged below the primary support structure of the tunnel arch part from front to back; the skeleton beams are arched beams with the same radius as the outer layer reinforcing steel bar net, and a plurality of skeleton beams form a bearing structure of secondary lining reinforcing steel bars of the tunnel arch part; 2. the secondary lining steel bar of the tunnel arch part is bound as follows: the outer layer reinforcing steel bar meshes are bound on the upper parts of the plurality of framework beams, and then the inner layer reinforcing steel bar meshes are suspended on the outer layer reinforcing steel bar meshes through vertical connecting ribs. Although the invention can realize rapid binding of lining steel bars of tunnels, temporary assembly is still needed in the tunnels, the invention has no practicability for small horseshoe-shaped tunnels, and various dust and smoke generated in the construction process can cause environmental and health problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the assembled steel bar segment for the rapid lining of the horseshoe-shaped tunnel and the assembling method, which can be used for directly and rapidly assembling in the horseshoe-shaped tunnel without on-site bundling, and are efficient and convenient.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the assembled steel bar segment method for the horseshoe-shaped tunnel rapid lining comprises a capping steel bar mesh block and at least one pair of side wall steel bar mesh blocks, wherein each pair of side wall steel bar mesh blocks are respectively arranged at two ends of the capping steel bar mesh block and form a horseshoe shape with the capping steel bar mesh block;
the capping reinforcing steel bar net block comprises a plurality of first circumferential reinforcing steel bars and a plurality of first construction reinforcing steel bars which are bound together, wherein the first circumferential reinforcing steel bars are sequentially and parallelly arranged along the axis of the hole, the first construction reinforcing steel bars are sequentially and parallelly arranged along the radial direction of the hole, and the first construction reinforcing steel bars and the first circumferential reinforcing steel bars are kept vertical;
the first circumferential steel bars are arranged along the cross section of the hole, and the shape of the first circumferential steel bars is consistent with the radian of the top of the horseshoe-shaped tunnel; the two ends of the first circumferential steel bar along the cross section of the hole are externally provided with anchoring parts a for connecting and anchoring the capping steel bar net block and the side wall steel bar net block; the first circumferential steel bars between the adjacent lining units are connected in an anchoring manner;
the single first construction steel bars are arranged along the axial direction of the hole, the first construction steel bars are U-shaped, the long side of each U-shaped is fixed on the first circumferential steel bar, the opening ends of the first construction steel bars are inwards bent and extend out of the anchoring parts c, and the anchoring parts c are used for anchoring the first construction steel bars in the adjacent lining units;
the side wall reinforcing steel bar net block comprises a plurality of second circumferential reinforcing steel bars and a plurality of second construction reinforcing steel bars which are bound together, wherein the second circumferential reinforcing steel bars are sequentially and parallelly arranged along the axis of the hole, the second construction reinforcing steel bars are sequentially and parallelly arranged along the radial direction of the hole, and the second construction reinforcing steel bars and the second circumferential reinforcing steel bars are kept vertical;
the second circumferential steel bars are arranged along the cross section of the hole, and the shape of the second circumferential steel bars is consistent with the radian of the side surface of the horseshoe-shaped tunnel; an anchoring part d is extended at the upper end of the second circumferential reinforcement along the cross section of the hole and is used for connecting and anchoring the side wall reinforcement mesh block and the capping reinforcement mesh block/adjacent side wall reinforcement mesh blocks; an anchoring part e is extended at the lower end of the second circumferential reinforcement along the cross section of the hole, and the anchoring part e is used for anchoring the side wall reinforcement mesh block and the adjacent side wall reinforcement mesh block/concrete bottom plate; anchoring between second circumferential steel bars in the adjacent lining units;
the single second constructional steel bar is arranged along the axial direction of the hole, the second constructional steel bars are U-shaped, the long side of each U-shaped is fixed on the second circumferential steel bar, the opening ends of the second constructional steel bars are inwards bent and extend out of the anchoring parts g, and the anchoring of the second constructional steel bars in the adjacent lining units is realized.
Description: the reinforced pipe piece can be directly and rapidly assembled in the tunnel without on-site bundling, and is efficient and convenient; the connection among the reinforcing steel bar segments, the concrete bottom plate and the reinforcing steel bar segments of different lining units is realized through anchoring, so that the anchoring strength can be fully achieved, and the function of the reinforcing steel bar segments is exerted. In order to ensure the structural strength of the capping reinforcing steel bar segment and the side wall reinforcing steel bar segment, the two reinforcing steel bar segments can be fixed in a mechanical connection (sleeve) and welding fixing mode.
Preferably, there is at least one lining unit in which:
a plurality of inwards protruding fasteners are arranged on the anchoring part a on the first circumferential reinforcement, and a plurality of corresponding fastening holes are formed in the corresponding area of the second circumferential reinforcement and the anchoring part a;
for the side wall reinforcing steel bar net block directly adjacent to the capping reinforcing steel bar net block, a plurality of outwards protruding fasteners are arranged on the anchoring part d on the second circumferential reinforcing steel bar, and a plurality of corresponding fastening holes are formed in the corresponding area of the first circumferential reinforcing steel bar and the anchoring part d.
Description: for lining elements in certain positions, the lining elements are required to bear larger stress, in order to avoid cracking of the capping reinforcing steel bar net blocks and the side wall reinforcing steel bar net blocks, a fastening piece and a fastening hole are added to realize mechanical locking on the basis of welded fixation, and the fastening piece and the fastening hole are integrally formed when the reinforcing steel bar net blocks are bundled, so that the lining elements are convenient to use.
The fastener comprises a pin shaft head and a shaft body which are arranged on a fixed plane, and a through shaft hole is formed in the part, close to the lower end, of the shaft body; the whole fastening hole is T-shaped, a movable plate is arranged at the bottom of the vertical section of the fastening hole, transmission parts are fixedly arranged at two ends of the top of the movable plate, a stop block lower than the transmission parts is arranged in the middle of the movable plate, and the bottom of the movable plate is connected with the bottom of the fastening hole through a spring; the transmission piece is a rack-and-pinion pair, wherein the centre of a circle of gear is fixed at a certain point on corresponding lateral wall, the interior terminal surface of gear is vertically equipped with the sleeve, the sleeve is inside to be equipped with the fixed axle through the thread bush, the fixed axle can be precession or unscrew for the sleeve, when the fastener is located the extreme low of fastening hole, thereby the fixed axle can get into the shaft hole and realize the locking of fastener and fastening hole.
The fastening piece and the fastening hole can realize the insertion-self locking, can realize the locking by applying the thrust in the hoisting process, does not need extra manual steps, is simple and efficient,
preferably, when the height of the horseshoe-shaped tunnel is not more than 5m, the number of the side wall reinforcing mesh blocks is 1 pair.
It is explained that the side wall reinforcing steel bar net blocks do not need to be split again for the horseshoe tunnel with the diameter being lower than 5 m.
The assembly method for the assembled steel bar segment comprises the following steps of:
s1: dividing the horseshoe-shaped tunnel lining into different tunnel lining units along the axial direction of the tunnel, wherein the length of each tunnel lining unit is 2-4m;
s2: determining the sizes and the shapes of the capping reinforcing steel bar net blocks and the side wall reinforcing steel bar net blocks according to the sizes of the horseshoe-shaped tunnel lining, and determining the logarithm of the side wall reinforcing steel bar net blocks in each tunnel lining unit; binding steel bars in a steel bar processing plant outside the tunnel;
s3: in any lining unit, firstly connecting the side wall reinforcing steel bar net blocks of each pair on the reserved dowel bars on the reinforced concrete bottom plate through the anchoring parts f, and then hoisting the capping reinforcing steel bar net blocks to the reinforcing steel bar net blocks of the two side walls by using a hoisting machine for assembly; the concrete fixing mode adopts sleeve and welding to ensure the stress intensity of the structure;
s4: in the adjacent lining units, side wall reinforcing steel bar net blocks and capping reinforcing steel bar net blocks are sequentially installed according to the sequence of S3, and anchoring among the reinforcing steel bar net blocks is carried out in the adjacent lining units;
s5: after the lining of a certain area is fixed, erecting a template, plugging and pouring concrete, wherein if other lining units which are poured are not arranged around the lining unit, double-side plugging is needed; if the adjacent side of the lining unit is the lining unit after casting, the lining unit is plugged on one side;
s6: and repeating the steps S3-S5 until the lining of the whole horseshoe-shaped tunnel is completed.
Description: by utilizing the method, the quick lining of the horseshoe-shaped tunnel can be simply and quickly realized without checking the size of the reinforcing steel bars again on site and binding on site; meanwhile, in the mounting process of the lining unit provided with the fastening pieces/fastening holes, after the capping reinforcement mesh blocks are lifted between the two side wall reinforcement mesh blocks by using a lifting machine, a pushing force can be directly applied to enable the fastening pieces on the anchoring part a to be inserted into the fastening holes on the second circumferential reinforcement, and meanwhile, the fastening pieces on the anchoring part d are inserted into the fastening holes on the first circumferential reinforcement, so that the side wall reinforcement mesh blocks and the capping reinforcement mesh blocks are locked;
preferably, the joint surface between the reinforcing mesh blocks in the different lining units is provided with a pore smaller than 200 mm.
Description: the gaps between the reinforcing mesh blocks are convenient for installation, but when the gaps are too large, certain bearing capacity and stability are affected, so the gaps are preferably below 200 mm.
Preferably, in step S2, the ligating process needs to take into account the range of deformation errors during transportation and installation.
Preferably, in the step S2, in the process of determining the shape and the size of the capping reinforcing steel bar mesh block and the side wall reinforcing steel bar mesh block, the joint of the capping reinforcing steel bar mesh block and the side wall reinforcing steel bar mesh block is prevented from being in a state of being stressed greatly.
Description: for each lining unit, the joint between different reinforcing mesh blocks inevitably loses some bearing capacity, so that when the lining unit is detached, the point with larger stress is avoided as the joint.
Compared with the prior art, the invention has the beneficial effects that:
(1) The assembled duct pieces can be bound outside the hole for production, and can be assembled in the hole directly after transportation without on-site binding;
(2) The assembly pipe piece is provided with various anchoring parts, so that the anchoring strength and the bearing force reaching the standard can be realized again;
(3) In the connection of the capping reinforcing steel bar net block and the side wall reinforcing steel bar net block, the connecting part is generally positioned at a place with larger stress and is a main cracking end and a fragile end, so that a locking piece is additionally arranged at the connecting part of the capping reinforcing steel bar net block and the side wall reinforcing steel bar net block for mechanical locking, and the circumferential bearing force and the longitudinal bearing force are increased;
(4) The locking piece adopts a fastening piece and a fastening hole, and automatic locking can be realized only by adding an axial thrust in the hoisting process of the hoisting machine without manual operation;
(5) The large-sized, medium-sized and small-sized horseshoe-shaped tunnels are practical, and bundling and welding are not needed by using large instruments on site.
(6) The rapid lining of different lining units can be realized rapidly by utilizing the assembled duct pieces, so that the rapid lining of the whole horseshoe-shaped tunnel is realized.
Drawings
FIG. 1 is a schematic diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a splice according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of the splicing of embodiment 1 of the present invention;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 5 is a cross-sectional view taken at B-B of FIG. 1;
FIG. 6 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 7 is a schematic view showing the structure of a fastener and a fastening hole in embodiment 2 of the present invention;
FIG. 8 is a schematic view of the locking condition of the fastener and fastening hole of the present invention;
FIG. 9 is a schematic view of the structure of the driving member in the fastening hole of the present invention;
FIG. 10 is a schematic diagram of the structure of embodiment 3 of the present invention;
in the figure, 1-capped rebar mesh block, 11-first hoop rebar, 111-anchor a, 12-first construction rebar, 121-anchor c, 2-sidewall rebar mesh block, 21-second hoop rebar, 211-anchor d, 212-anchor e, 22-second construction rebar, 221-anchor g, 3-fastener, 31-pin head, 32-pin shaft, 33-shaft hole, 4-fastening hole, 41-moving plate, 42-transmission piece, 43-stopper, 44-sleeve, 45-fixed shaft.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
In the embodiment, the height of the horseshoe-shaped tunnel is 3.5 m, and the length is 1km;
referring to fig. 1-5, an assembled steel bar segment for rapid lining of a horseshoe tunnel comprises a capping steel bar mesh block 1 and a pair of side wall steel bar mesh blocks 2, wherein each side wall steel bar mesh block 2 is respectively arranged at two ends of the capping steel bar mesh block 1 and forms a horseshoe shape with the capping steel bar mesh block 1;
the capping reinforcing steel bar net block 1 comprises a plurality of first annular reinforcing steel bars 11 and a plurality of first constructional reinforcing steel bars 12 which are bound together, wherein the first annular reinforcing steel bars 11 are sequentially and parallelly arranged along the axis of a hole, the first constructional reinforcing steel bars 12 are sequentially and parallelly arranged along the radial direction of the hole, and the first constructional reinforcing steel bars 12 and the first annular reinforcing steel bars 11 are kept vertical;
the first circumferential steel bars 11 are arranged along the cross section of the hole, and the shape of the first circumferential steel bars 11 is consistent with the radian of the top of the horseshoe-shaped tunnel; the two ends of the first circumferential steel bar 11 along the cross section of the hole are externally provided with anchoring parts a111 for connecting and anchoring the capping steel bar net block 1 and the side wall steel bar net block 2; the first circumferential steel bars 11 between the adjacent lining units are connected in an anchoring manner;
the single first constructional steel bars 12 are arranged along the axial direction of the hole, the first constructional steel bars 12 are U-shaped, the long side of each U-shaped is fixed on the first circumferential steel bar 11, the opening ends of the first constructional steel bars 12 are inwards bent and extend out of the anchoring parts c121 for anchoring the first constructional steel bars 12 in the adjacent lining units;
the side wall reinforcing steel bar net block 2 comprises a plurality of second circumferential reinforcing steel bars 21 and a plurality of second constructional reinforcing steel bars 22 which are bound together, wherein the second circumferential reinforcing steel bars 21 are sequentially and parallelly arranged along the axis of the hole, the second constructional reinforcing steel bars 22 are sequentially and parallelly arranged along the radial direction of the hole, and the second constructional reinforcing steel bars 22 and the second circumferential reinforcing steel bars 21 are kept vertical;
the second circumferential steel bars 21 are arranged along the cross section of the hole, and the shape of the second circumferential steel bars 21 is consistent with the radian of the side surface of the horseshoe-shaped tunnel; an anchoring part d211 is extended at the upper end of the second circumferential steel bar 21 along the cross section of the hole and is used for connecting and anchoring the side wall steel bar net block 2 and the capping steel bar net block 1/the adjacent side wall steel bar net block 2; an anchoring part e212 extends outwards from the lower end of the second circumferential steel bar 21 along the cross section of the hole, and the anchoring part e212 is used for anchoring the side wall steel bar net block 2 and the adjacent side wall steel bar net block 2/concrete bottom plate; anchoring between second circumferential steel bars 21 in the adjacent lining units;
the single second constructional steel bars 22 are arranged along the axial direction of the hole, the second constructional steel bars 22 are U-shaped, the long side of each U-shaped is fixed on the second circumferential steel bar 21, the opening ends of the second constructional steel bars 22 are inwards bent and extend out of the anchoring parts g221, and the anchoring of the second constructional steel bars 22 in the adjacent lining units is realized.
Referring to fig. 2-3, the assembly method using the duct piece includes the following steps:
s1: dividing the horseshoe-shaped tunnel lining into different tunnel lining units along the axial direction of the tunnel, wherein the length of each tunnel lining unit is 2m;
s2: determining the shapes of the capping reinforcing steel bar net block 1 and the side wall reinforcing steel bar net block 2, and avoiding the connection part of the capping reinforcing steel bar net block and the side wall reinforcing steel bar net block from being in a state of larger stress, and binding reinforcing steel bars in a reinforcing steel bar processing plant outside a tunnel, wherein the binding process needs to consider the deformation error range in the transportation and installation process;
s3: in any lining unit, firstly connecting the side wall reinforcing steel bar net blocks 2 of each pair on the reserved dowel bars on the reinforced concrete bottom plate through the anchoring parts f, and then hoisting the capping reinforcing steel bar net blocks 1 to the reinforcing steel bar net blocks 2 of the two side walls by using a hoisting machine for assembly; after assembly, the steel plate is fixed again through welding to ensure the structural strength;
s4: in the adjacent lining units, side wall reinforcing steel bar net blocks 2 and top-sealing reinforcing steel bar net blocks 1 are sequentially installed according to the sequence of S3, a hole smaller than 200mm is reserved on the joint surface between the reinforcing steel bar net blocks in different lining units so as to facilitate installation, and anchoring between the reinforcing steel bar net blocks is performed in the adjacent lining units;
s5: after the lining of a certain area is fixed, erecting a template, plugging and pouring concrete, wherein if other lining units which are poured are not arranged around the lining unit, double-side plugging is needed; if the adjacent side of the lining unit is the lining unit after casting, the lining unit is plugged on one side;
s6: and repeating the steps S3-S5 until the lining of the whole horseshoe-shaped tunnel is completed.
Description: the reinforced pipe piece can be directly and rapidly assembled in the tunnel without on-site bundling, and is efficient and convenient; meanwhile, due to the design of multiple anchoring parts, the fixing of the reinforcing steel bar segments among the reinforcing steel bar segments, the concrete bottom plate and the reinforcing steel bar segments of different lining units can be realized, the anchoring strength can be fully achieved, and the function of the reinforcing steel bar segments is exerted.
Examples
Referring to fig. 6-9, in the present embodiment, the horseshoe tunnel has a height of 3.5 m and a length of 1km;
the assembled steel bar segment for the rapid lining of the horseshoe-shaped tunnel comprises a capping steel bar net block 1 and a pair of side wall steel bar net blocks 2, wherein each side wall steel bar net block 2 is respectively arranged at two ends of the capping steel bar net block 1 and forms a horseshoe shape with the capping steel bar net block 1;
the capping reinforcing steel bar net block 1 comprises a plurality of first annular reinforcing steel bars 11 and a plurality of first constructional reinforcing steel bars 12 which are bound together, wherein the first annular reinforcing steel bars 11 are sequentially and parallelly arranged along the axis of a hole, the first constructional reinforcing steel bars 12 are sequentially and parallelly arranged along the radial direction of the hole, and the first constructional reinforcing steel bars 12 and the first annular reinforcing steel bars 11 are kept vertical;
the first circumferential steel bars 11 are arranged along the cross section of the hole, and the shape of the first circumferential steel bars 11 is consistent with the radian of the top of the horseshoe-shaped tunnel; the two ends of the first circumferential steel bar 11 along the cross section of the hole are externally provided with anchoring parts a111 for connecting and anchoring the capping steel bar net block 1 and the side wall steel bar net block 2; the first circumferential steel bars 11 between the adjacent lining units are connected in an anchoring manner;
the single first constructional steel bars 12 are arranged along the axial direction of the hole, the first constructional steel bars 12 are U-shaped, the long side of each U-shaped is fixed on the first circumferential steel bar 11, the opening ends of the first constructional steel bars 12 are inwards bent and extend out of the anchoring parts c121 for anchoring the first constructional steel bars 12 in the adjacent lining units;
the side wall reinforcing steel bar net block 2 comprises a plurality of second circumferential reinforcing steel bars 21 and a plurality of second constructional reinforcing steel bars 22 which are bound together, wherein the second circumferential reinforcing steel bars 21 are sequentially and parallelly arranged along the axis of the hole, the second constructional reinforcing steel bars 22 are sequentially and parallelly arranged along the radial direction of the hole, and the second constructional reinforcing steel bars 22 and the second circumferential reinforcing steel bars 21 are kept vertical;
the second circumferential steel bars 21 are arranged along the cross section of the hole, and the shape of the second circumferential steel bars 21 is consistent with the radian of the side surface of the horseshoe-shaped tunnel; an anchoring part d211 is extended at the upper end of the second circumferential steel bar 21 along the cross section of the hole and is used for connecting and anchoring the side wall steel bar net block 2 and the capping steel bar net block 1/the adjacent side wall steel bar net block 2; an anchoring part e212 extends outwards from the lower end of the second circumferential steel bar 21 along the cross section of the hole, and the anchoring part e212 is used for anchoring the side wall steel bar net block 2 and the adjacent side wall steel bar net block 2/concrete bottom plate; anchoring between second circumferential steel bars 21 in the adjacent lining units;
the single second constructional steel bars 22 are arranged along the axial direction of the hole, the second constructional steel bars 22 are U-shaped, the long side of each U-shaped is fixed on the second circumferential steel bar 21, the opening ends of the second constructional steel bars 22 are inwards bent and extend out of the anchoring parts g221, and the anchoring of the second constructional steel bars 22 in the adjacent lining units is realized.
For two adjacent lining units, the first hoop reinforcement 11 and the second hoop reinforcement 21 in one lining unit have the following structures:
a plurality of fasteners 3 protruding inwards are arranged on the anchoring part a111 on the first circumferential reinforcement 11, and a plurality of corresponding fastening holes 4 are arranged in the corresponding area of the second circumferential reinforcement 21 and the anchoring part a 111;
for the side wall reinforcing steel bar net block 2 directly adjacent to the capping reinforcing steel bar net block 1, a plurality of outwards protruding fasteners 3 are arranged on the anchoring part d211 on the second circumferential reinforcing steel bar 21, and a plurality of corresponding fastening holes 4 are arranged in the corresponding area of the first circumferential reinforcing steel bar 11 and the anchoring part d 211;
the fastener 3 comprises a pin shaft head 31 and a shaft body 32 which are arranged on a fixed plane, and a through shaft hole 33 is arranged at the part of the shaft body 32 close to the lower end; the whole fastening hole 4 is T-shaped, the bottom of the vertical section of the fastening hole is provided with a movable plate 41, two ends of the top of the movable plate 41 are fixedly provided with a transmission piece 42, the middle part of the movable plate 41 is provided with a stop block 43 lower than the transmission piece 42, and the bottom of the movable plate 41 is connected with the bottom of the fastening hole 4 through a spring; the transmission member 42 is a rack-and-pinion pair, the center of the gear is fixed at a certain point on the corresponding side wall, the inner end surface of the gear is vertically provided with a sleeve 44, a fixed shaft 45 is arranged inside the sleeve 44 through a threaded sleeve, the fixed shaft 45 can be screwed in or screwed out relative to the sleeve 44, and when the fastening piece 3 is positioned at the lowest end of the fastening hole 4, the fixed shaft 45 can enter the shaft hole 33, so that the fastening piece 3 and the fastening hole 4 can be locked.
The assembly method using the duct piece comprises the following steps:
s1: dividing the horseshoe-shaped tunnel lining into different tunnel lining units along the axial direction of the tunnel, wherein the length of each tunnel lining unit is 2m;
s2: determining the shapes of the capping reinforcing steel bar net block 1 and the side wall reinforcing steel bar net block 2, and avoiding the connection part of the capping reinforcing steel bar net block and the side wall reinforcing steel bar net block from being in a state of larger stress, and binding reinforcing steel bars in a reinforcing steel bar processing plant outside a tunnel, wherein the binding process needs to consider the deformation error range in the transportation and installation process;
s3: in any lining unit, firstly connecting the side wall reinforcing steel bar net blocks 2 of each pair on the reserved dowel bars on the reinforced concrete bottom plate through the anchoring parts f, and then hoisting the capping reinforcing steel bar net blocks 1 to the reinforcing steel bar net blocks 2 of the two side walls by using a hoisting machine for assembly; in the process of installing the lining unit provided with the fastening pieces 3/the fastening holes 4, after the capping bar net block 1 is hoisted between the two side wall bar net blocks 2 by using a hoisting machine, a thrust force is applied to enable the fastening pieces 3 on the anchoring portion a111 to be inserted into the fastening holes 4 on the second circumferential bar 211, and meanwhile, the fastening pieces 3 on the anchoring portion d211 are inserted into the fastening holes 4 on the first circumferential bar 111, so that the side wall bar net blocks 2 and the capping bar net block 1 are locked; then fixing again by welding;
s4: in the adjacent lining units, side wall reinforcing steel bar net blocks 2 and top-sealing reinforcing steel bar net blocks 1 are sequentially installed according to the sequence of S3, a hole smaller than 200mm is reserved on the joint surface between the reinforcing steel bar net blocks in different lining units so as to facilitate installation, and anchoring between the reinforcing steel bar net blocks is performed in the adjacent lining units;
s5: after the lining of a certain area is fixed, erecting a template, plugging and pouring concrete, wherein if other lining units which are poured are not arranged around the lining unit, double-side plugging is needed; if the adjacent side of the lining unit is the lining unit after casting, the lining unit is plugged on one side;
s6: and repeating the steps S3-S5 until the lining of the whole horseshoe-shaped tunnel is completed.
Description: in this embodiment, a mechanical fixing force is added to the capping bar mesh block 1 and the side wall bar mesh block 2 in the partial lining unit to increase the bearing force as compared with embodiment 1.
Examples
Referring to fig. 10, in the present embodiment, the horseshoe tunnel has a height of 7.2m and a length of 5km;
embodiment 3 differs from embodiment 1 in that the side wall reinforcing mesh blocks 2 are arranged in two pairs; the rest of the structure is the same as that of the embodiment 1;
in the rapid lining process, for each lining unit, it is necessary to mount the second pair of side wall reinforcing mesh blocks 2 to the reinforced concrete floor, then mount the first pair of side wall reinforcing mesh blocks 2 onto the second pair of side wall reinforcing mesh blocks 2, then mount the capping reinforcing mesh block 1, and the rest of the steps are the same as in example 1.
Claims (7)
1. The assembling method of the assembled steel bar segment for the quick lining of the horseshoe-shaped tunnel is characterized by comprising the following steps of: the method comprises the following steps:
s1: dividing the horseshoe-shaped tunnel lining into different tunnel lining units along the axial direction of the tunnel, wherein the length of each tunnel lining unit is 2-4m;
s2: determining the sizes and the shapes of the capping reinforcing steel bar net blocks (1) and the side wall reinforcing steel bar net blocks (2) according to the sizes of the horseshoe-shaped tunnel lining, and determining the logarithm of the side wall reinforcing steel bar net blocks (2) in each tunnel lining unit; binding steel bars in a steel bar processing plant outside the tunnel;
s3: in any lining unit, firstly connecting the side wall reinforcing steel bar net blocks (2) of each pair on the reserved dowel bars on the reinforced concrete bottom plate through the anchoring parts f, and then hoisting the capping reinforcing steel bar net blocks (1) to the reinforcing steel bar net blocks (2) of the two side walls by using a hoisting machine for assembly;
s4: in the adjacent lining units, side wall reinforcing steel bar net blocks (2) and capping reinforcing steel bar net blocks (1) are sequentially installed according to the sequence of S3, and anchoring among the reinforcing steel bar net blocks is carried out in the adjacent lining units;
s5: after the lining of a certain area is fixed, erecting a template, plugging and pouring concrete, wherein if other lining units which are poured are not arranged around the lining unit, double-side plugging is needed; if the adjacent side of the lining unit is the lining unit after casting, the lining unit is plugged on one side;
s6: repeating the steps S3-S5 until all lining of the whole horseshoe-shaped tunnel is completed;
the assembled steel bar segment for the horseshoe-shaped tunnel rapid lining comprises a capping steel bar net block (1) and at least one pair of side wall steel bar net blocks (2), wherein each pair of side wall steel bar net blocks (2) are respectively arranged at two ends of the capping steel bar net block (1) and form a horseshoe shape with the capping steel bar net block (1);
the capping reinforcing steel bar net block (1) comprises a plurality of first circumferential reinforcing steel bars (11) and a plurality of first construction reinforcing steel bars (12) which are bound together, wherein the plurality of first circumferential reinforcing steel bars (11) are sequentially arranged in parallel along the axis of a hole, the plurality of first construction reinforcing steel bars (12) are sequentially arranged in parallel along the radial direction of the hole, and the first construction reinforcing steel bars (12) and the first circumferential reinforcing steel bars (11) are kept vertical;
the first circumferential steel bars (11) are arranged along the section of the hole, and the shape of the first circumferential steel bars (11) is consistent with the radian of the top of the horseshoe-shaped tunnel; the first circumferential steel bars (11) are externally provided with anchoring parts a (111) along the two ends of the cross section of the hole, and are used for connecting and anchoring the capping steel bar net blocks (1) and the side wall steel bar net blocks (2); first circumferential steel bars (11) between adjacent lining units are connected in an anchoring manner;
the single first construction steel bars (12) are arranged along the axial direction of the hole, the first construction steel bars (12) are U-shaped, the long side of each U-shaped is fixed on the first circumferential steel bar (11), and the open ends of the first construction steel bars (12) are inwards bent and extend out of the anchoring parts c (121) for anchoring the first construction steel bars (12) in the adjacent lining units;
the side wall reinforcing steel bar net block (2) comprises a plurality of second circumferential reinforcing steel bars (21) and a plurality of second construction reinforcing steel bars (22) which are bound together, the second circumferential reinforcing steel bars (21) are sequentially arranged in parallel along the axis of the hole, the second construction reinforcing steel bars (22) are sequentially arranged in parallel along the radial direction of the hole, and the second construction reinforcing steel bars (22) and the second circumferential reinforcing steel bars (21) are kept vertical;
the second circumferential steel bars (21) are arranged along the section of the hole, and the shape of the second circumferential steel bars (21) is consistent with the radian of the side surface of the horseshoe-shaped tunnel; an anchoring part d (211) is extended at the upper end of the second circumferential steel bar (21) along the cross section of the hole and is used for connecting and anchoring the side wall steel bar net block (2) and the capping steel bar net block (1)/adjacent side wall steel bar net blocks (2); an anchoring part e (212) extends outwards from the lower end of the second circumferential steel bar (21) along the cross section of the hole, and the anchoring part e (212) is used for anchoring the side wall steel bar net block (2) and the adjacent side wall steel bar net block (2)/concrete bottom plate; anchoring between second circumferential steel bars (21) in the adjacent lining units;
the single second construction steel bars (22) are arranged along the axial direction of the hole, the second construction steel bars (22) are U-shaped, the long side of each U-shaped is fixed on the second circumferential steel bar (21), the opening ends of the second construction steel bars (22) are inwards bent and extend out of the anchoring parts g (221), and the anchoring of the second construction steel bars (22) in the adjacent lining units is realized.
2. The method of assembling a segment of rebar of claim 1, wherein: there is at least one lining element in which:
a plurality of inwards protruding fasteners (3) are arranged on the anchoring part a (111) on the first circumferential reinforcement (11), and a plurality of corresponding fastening holes (4) are arranged in the corresponding areas of the second circumferential reinforcement (21) and the anchoring part a (111);
for the side wall reinforcing steel bar net block (2) directly adjacent to the capping reinforcing steel bar net block (1), a plurality of outwards protruding fasteners (3) are arranged on the anchoring part d (211) on the second circumferential reinforcing steel bar (21), and a plurality of corresponding fastening holes (4) are formed in the corresponding area of the first circumferential reinforcing steel bar (11) and the anchoring part d (211).
3. The method of assembling a segment of rebar of claim 2, wherein: the fastener (3) comprises a pin shaft head (31) and a shaft body (32) which are arranged on a fixed plane, and a through shaft hole (33) is formed in the part, close to the lower end, of the shaft body (32); the fastening hole (4) is integrally T-shaped, a movable plate (41) is arranged at the bottom of the vertical section of the fastening hole, transmission pieces (42) are fixedly arranged at two ends of the top of the movable plate (41), a stop block (43) lower than the transmission pieces (42) is arranged in the middle of the movable plate (41), and the bottom of the movable plate (41) is connected with the bottom of the fastening hole (4) through a spring; the transmission piece (42) is a rack and pinion pair, wherein the centre of a circle of gear is fixed at a certain point on corresponding lateral wall, the interior terminal surface of gear is vertically equipped with sleeve (44), sleeve (44) inside is equipped with fixed axle (45) through the thread bush, fixed axle (45) can be precession or unscrew for sleeve (44), when fastener (3) are located the extreme low of fastening hole (4), thereby fixed axle (45) can get into shaft hole (33) and realize the locking of fastener (3) and fastening hole (4).
4. The method of assembling a segment of rebar of claim 1, wherein: and when the height of the horseshoe-shaped tunnel is not more than 5m, the number of the side wall reinforcing steel bar net blocks (2) is 1 pair.
5. The method of assembling a segment of rebar of claim 4, wherein: and a pore smaller than 200mm is reserved on the joint surface between the reinforcing steel bar net blocks in different lining units.
6. The method of assembling a segment of rebar of claim 4, wherein: in step S2, the binding process needs to take into account the deformation error range during transportation and installation.
7. The method of assembling a segment of rebar of claim 4, wherein: in the step S2, in the process of determining the shape and the size of the capping reinforcing steel bar net block (1) and the side wall reinforcing steel bar net block (2), the joint of the capping reinforcing steel bar net block (1) and the side wall reinforcing steel bar net block (2) is prevented from being in a state with larger stress.
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