CN117364676B - Prefabricated single-hole explosion-proof box culvert - Google Patents
Prefabricated single-hole explosion-proof box culvert Download PDFInfo
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- CN117364676B CN117364676B CN202311463523.5A CN202311463523A CN117364676B CN 117364676 B CN117364676 B CN 117364676B CN 202311463523 A CN202311463523 A CN 202311463523A CN 117364676 B CN117364676 B CN 117364676B
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- 229910000831 Steel Inorganic materials 0.000 claims description 124
- 239000010959 steel Substances 0.000 claims description 124
- 230000002787 reinforcement Effects 0.000 claims description 49
- 239000004567 concrete Substances 0.000 claims description 44
- 230000003014 reinforcing effect Effects 0.000 claims description 37
- 210000001503 joint Anatomy 0.000 claims description 24
- 238000009434 installation Methods 0.000 claims description 20
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 19
- 238000004880 explosion Methods 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 2
- 230000008602 contraction Effects 0.000 claims 1
- 239000002689 soil Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000009417 prefabrication Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B1/4157—Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0636—Three-dimensional reinforcing mats composed of reinforcing elements laying in two or more parallel planes and connected by separate reinforcing parts
- E04C5/064—Three-dimensional reinforcing mats composed of reinforcing elements laying in two or more parallel planes and connected by separate reinforcing parts the reinforcing elements in each plane being formed by, or forming a, mat of longitunal and transverse bars
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/18—Spacers of metal or substantially of metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D5/00—Safety arrangements
- F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
- F42D5/045—Detonation-wave absorbing or damping means
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Engineering & Computer Science (AREA)
- Sewage (AREA)
Abstract
The invention provides a prefabricated single-hole explosion-proof box culvert, which comprises a first prefabricated member and a second prefabricated member positioned below the first prefabricated member, wherein the first prefabricated member and the second prefabricated member are connected through a plurality of groups of connecting components; the connecting assembly comprises a first connecting piece and a second connecting piece; the cap head of the second connecting piece is vertically inserted into the accommodating cavity of the first connecting piece and then limited by an elastically telescopic lock pin on the first connecting piece; the distance between the cap head and the lock pin in the vertical direction is L, so that relative movement between the first prefabricated part and the second prefabricated part in the vertical direction can be realized, wherein L is larger than 0. The invention greatly enhances the explosion-proof performance of the single-hole assembled box culvert through structural design.
Description
Technical Field
The invention relates to the technical field of explosion-proof structures, in particular to a prefabricated single-hole explosion-proof box culvert.
Background
The box culvert is used as a main component borne in the railway bridge culvert, and once the box culvert is damaged, the bearing capacity is lost, so that the local component of the structure is damaged, and even the whole structure collapses. When explosion accidents occur in the box culvert, the structure of the box culvert is damaged, and the explosion-proof and impact-proof design is very necessary for some railway culverts with strategic significance and protection requirements.
Conventional reinforced concrete box culverts are generally cast in place or cast in a factory as a whole for transportation to a construction site. Both of these methods have significant drawbacks: the cast-in-place channel has long construction period and low efficiency, and is easily influenced by weather and other condition factors. The whole box culvert produced in the factory has the defects of difficult transportation and hoisting and great discount of the whole structural strength. Meanwhile, the box culverts constructed by the two methods generally have no explosion and impact preventing capability.
The chinese patent of application number CN201810425503.1 proposes a prefabricated box culvert structure of convenient anchor, adopt the inside arc double-end screw rod that alternates of arc hole to consolidate the top of box culvert in this patent, but when accepting explosion impact load, the great deformation takes place very easily, even appear large tracts of land sunken, influence box culvert structure's function and normal use, this structure can be conveniently fixed at the fixed of arc double-end screw rod in the anchor hole through the connecting plate that the bottom plate was equipped with the spring with arc double-end screw rod support, but this connecting method is not firm enough, arc double-end screw rod is liable to produce the deformation, when the load is great, this structure is very easy to take place to destroy, unlike reinforced concrete structure's stability, so it can splice the installation fast, but the stability degree that improves overall structure is limited, under explosion impact, be difficult to satisfy normal safe handling requirement.
The chinese patent of application number CN202110898796.7 proposes an assembled prefabricated box culvert, including roof, bottom plate and two blocks of curb plates, two the curb plate divides and establishes the bottom plate both sides, and curb plate and bottom plate fixed connection, the one end that the curb plate is close to the roof is seted up flutedly, fixedly connected with and recess joint complex lug on the corresponding side of roof, the spread groove has been seted up to correspondence on curb plate and the roof, is provided with the connecting block in the spread groove, connecting block and spread groove lateral wall fixed connection. The clamping block is very fragile in connection, and is easy to separate when receiving explosive impact load mainly by means of the gravity of the plate and the extrusion of upper soil pressure. The structure is an assembled structure, but the roof structure has poor strength, and when the roof structure is subjected to impact load, the whole structure can be greatly deformed or even collapsed.
In view of the above, there is an urgent need for a prefabricated single-hole explosion-proof box culvert to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a prefabricated single-hole explosion-proof box culvert, which aims to solve the problem of poor explosion-proof impact capability of the existing box culvert structure, and the concrete technical scheme is as follows:
The prefabricated single-hole explosion-proof box culvert comprises a first prefabricated member and a second prefabricated member positioned below the first prefabricated member, wherein the first prefabricated member and the second prefabricated member are connected through a plurality of groups of connecting components;
The connecting assembly comprises a first connecting piece and a second connecting piece; the cap head of the second connecting piece is vertically inserted into the accommodating cavity of the first connecting piece and then limited by an elastically telescopic lock pin on the first connecting piece; the distance between the cap head and the lock pin in the vertical direction is L, so that relative movement between the first prefabricated part and the second prefabricated part in the vertical direction can be realized, wherein L is larger than 0.
In the above technical solution, preferably, the first prefabricated member includes a first concrete layer and a first reinforcement cage disposed inside the first concrete layer; the first reinforcement cage comprises first longitudinal ribs, corrugated plates and inverted-concave first annular reinforcements; the first annular steel bar comprises a connecting steel bar section A, an outer steel bar section A and an inner steel bar section A, wherein the outer steel bar section A and the inner steel bar section A are both n-shaped, the outer steel bar section A is positioned at the outer side of the inner steel bar section A, and the ends of the vertical sections of the outer steel bar section A and the inner steel bar section A are connected through the connecting steel bar section A; the plurality of first annular steel bars are longitudinally arranged at intervals, and all the outer steel bar sections A are connected through the plurality of first longitudinal bars arranged at intervals; the corrugated plate is arranged on each inner side steel bar section A and is positioned on one side close to the outer side steel bar section A, two ends of the corrugated plate are respectively connected with two vertical sections of the inner side steel bar section A, and through holes for concrete to flow through are formed in the corrugated plate.
In the above technical scheme, preferably, the first reinforcement cage further comprises reinforcing ribs, and reinforcing ribs are respectively arranged at two right angles of the first annular reinforcement; the reinforcing ribs penetrate through the corrugated plates, and the two ends of the reinforcing ribs are respectively connected with the inner side steel bar section A and the outer side steel bar section A of the same first annular steel bar.
In the above technical solution, preferably, the first reinforcement cage further includes a plurality of hollow bars arranged in a longitudinal direction, and the hollow bars are transversely arranged in a gap between two adjacent first annular reinforcement bars; and two ends of the hollow rod are respectively connected to the first longitudinal bars at the highest positions of the two vertical sections of the outer steel bar section A.
In the above technical solution, preferably, the hollow rod is internally filled with foamed aluminum.
In the above technical scheme, preferably, reinforcing steel bar meshes are arranged on the upper surface of the first steel bar framework in a pair angle manner; and a lifting hook is arranged at the corner of the upper surface of the first steel reinforcement framework.
In the above technical solution, preferably, the second prefabricated member includes a second concrete layer and a second reinforcement cage disposed inside the second concrete layer; the second reinforcement cage comprises second longitudinal ribs and concave-shaped second annular reinforcement bars; the second annular steel bar comprises a connecting steel bar section B, an outer steel bar section B and an inner steel bar section B, wherein the outer steel bar section B and the inner steel bar section B are both n-shaped, the outer steel bar section B is positioned at the outer side of the inner steel bar section B, and the ends of the vertical sections of the outer steel bar section B and the inner steel bar section B are connected through the connecting steel bar section B; the plurality of second annular steel bars are arranged at intervals in the longitudinal direction, and the outer steel bar sections B are connected through the plurality of second longitudinal bars arranged at intervals.
In the above technical solution, preferably, the first reinforcement cage further includes a first lap joint rib and a first installation longitudinal rib; each connecting steel bar section A is connected through a plurality of first mounting longitudinal bars, and the first connecting piece is arranged on each first mounting longitudinal bar; a plurality of first lap joint ribs are longitudinally arranged on two sides of the first connecting piece, and the connecting parts of the first lap joint ribs are connected with the connecting steel bar section A;
The second reinforcement cage further comprises a second overlap joint rib and a second installation longitudinal rib; the connecting steel bar segments B are connected through a plurality of second installation longitudinal bars, and the second connecting pieces are arranged on the second installation longitudinal bars; and a plurality of second lap joint ribs are longitudinally arranged on two sides of the second connecting piece, and the connecting parts of the second lap joint ribs are connected with the connecting steel bar section B.
In the above technical scheme, preferably, the connecting end of the first prefabricated member is provided with a first receiving cavity, and the lap joint part of the first lap joint rib and the butt joint part of the first connecting piece are both positioned in the first receiving cavity;
the connecting end of the second prefabricated member is provided with a second bearing cavity corresponding to the first bearing cavity, and the lap joint part of the second lap joint rib and the butt joint part of the second connecting piece are both positioned in the second bearing cavity;
And grouting holes communicated with the first bearing cavity are formed in the first prefabricated member, and concrete is injected into the first bearing cavity and the second bearing cavity which are in butt joint through the grouting holes.
In the above technical solution, preferably, the first receiving cavity and the second receiving cavity are quickly positioned by matching grooves and bumps; four right angle positions outside the second prefabricated member are respectively provided with a right angle limiting piece.
The technical scheme of the invention has the following beneficial effects:
the first prefabricated member and the second prefabricated member are arranged in a split mode, so that construction staff can conveniently construct two parts of structures of the box culvert in advance, and the purpose of shortening the construction period of the prefabricated box culvert is achieved; in addition, the transfer of workers before assembling is facilitated, so that the occupied space of the single-hole explosion-proof prefabricated box culvert is reduced, and the box culvert can be conveniently transported and stored.
The corrugated plate, the hollow rod and the reinforcing ribs are arranged in the first steel bar framework to form a whole, so that the manufacturing cost is low, the novel box culvert top plate has good mechanical properties, and the energy absorption effect and the antiknock stability of the box culvert top plate are improved. The first prefabricated member has a three-layer explosion-proof impact structure, can well cope with explosion accidents of different degrees, and ensures the normal working capacity of the box culvert. The first connecting piece and the second connecting piece are in butt joint and then are in a vertical movement space with L distances, so that the first prefabricated member can move upwards for L distances under the explosion impact, and part of explosion impact energy can be offset to a certain extent.
The lap joint part of the first lap joint rib on the first prefabricated member and the first connecting piece extend into the second bearing cavity of the second prefabricated member, the lap joint part of the second lap joint rib on the second prefabricated member and the second connecting piece extend into the first bearing cavity of the first prefabricated member, and concrete slurry is injected into the first bearing cavity and the second bearing cavity after being in butt joint to form a concrete reinforcing steel structure, so that the stability of connection between the first prefabricated member and the second prefabricated member can be ensured.
Quick location is carried out through recess and lug cooperation between first prefab and the second prefab, makes first prefab can be quick fall into wherein dock with the second prefab through right angle locating part simultaneously, can effectually reduce the degree of difficulty of assembly between first prefab and the second prefab.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of the box culvert of the invention;
FIG. 2 is a schematic view of the first preform of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
Fig. 4 is a schematic structural view of a first reinforcement cage in the first preform;
FIG. 5 is an enlarged view of a portion of FIG. 4 at C;
FIG. 6 is a partial enlarged view at B in FIG. 4;
FIG. 7 is a schematic view of the structure of the second preform of FIG. 1;
Fig. 8 is a schematic structural view of a second reinforcement cage in a second preform;
Fig. 9 is a partial enlarged view at D in fig. 8;
FIG. 10 is a schematic view of the structure before the first connector and the second connector are disconnected;
FIG. 11 is a partial cross-sectional view of the first connector and the second connector after connection;
The device comprises a first prefabricated part, a second prefabricated part, a right-angle limiting part, a lifting hook, a first connecting part, a second connecting part and a right-angle limiting part, wherein the first prefabricated part, the second prefabricated part, the right-angle limiting part, the lifting hook and the second connecting part are arranged in sequence, and the right-angle limiting part is arranged between the first prefabricated part and the second prefabricated part;
101. Grouting holes, 102, first limit grooves, 103, second limit grooves, 104, first lap joint ribs, 105, first bearing cavities, 106, first annular reinforcing steel bars, 107, first longitudinal ribs, 108, corrugated plates, 109, reinforcing ribs, 110, fixing plates, 111, hollow rods, 112, reinforcing longitudinal ribs, 113, reinforcing transverse ribs, 114, through holes, 115 and first mounting longitudinal ribs; 201. the second joint rib, 202, the first positioning convex block, 203, the second positioning convex block, 204, the second receiving cavity, 205, the second annular reinforcing steel bar, 206, the second longitudinal rib, 207 and the second installation longitudinal rib; 501. the first mounting block 502, the connecting rod 503, the annular block 504, the lock pin 505, the spring 506, the first limit working surface 507 and the accommodating cavity; 601. the second mounting block 602, the anchor rod 603, the cap head 604 and the second limit working surface.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention, and preferred embodiments of the present invention are set forth. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Examples:
Referring to fig. 1-11, the embodiment provides a prefabricated single-hole explosion-proof box culvert, which comprises a first prefabricated member 1 and a second prefabricated member 2 positioned below the first prefabricated member 1, wherein the first prefabricated member 1 and the second prefabricated member 2 are connected through a plurality of groups of connecting components. The first prefabricated member 1 comprises a top plate and side plates A positioned on two sides of the top plate, the top plate and the two side plates A form a concave shape, the second prefabricated member 2 comprises a bottom plate and side plates B positioned on two sides of the bottom plate, the bottom plate and the two side plates B form a concave shape, and the first prefabricated member and the second prefabricated member form a complete box culvert after being in butt joint.
Specifically, the connecting assembly comprises a first connecting piece 5 and a second connecting piece 6; the butt joint end of the side plate A is longitudinally provided with a plurality of first connecting pieces 5, and the butt joint end of the side plate B is longitudinally correspondingly provided with a plurality of second connecting pieces 6 so as to realize butt joint of the first prefabricated member and the second prefabricated member.
Referring to fig. 10-11, the first connecting piece 5 includes a first mounting block 501, a connecting rod 502 and an annular block 503, wherein two ends of the connecting rod 502 are respectively connected with the first mounting block 501 and the annular block 503, and the first mounting block 501 is used for realizing connection between the first connecting piece 5 and the first prefabricated member; the annular block 503 is provided with a containing cavity 507, the annular block 503 is provided with a mounting cavity communicated with the containing cavity, the mounting cavity is internally provided with a lock pin 504, the lock pin 504 is sleeved with a spring 505, one end of the spring props against the inner wall of the mounting cavity, the other end of the spring props against a lock head at the front end of the lock pin, and meanwhile, the tail end of the lock pin 504 is provided with a limiting block, so that the lock pin cannot be separated from the mounting cavity, and the lock pin can elastically stretch out and draw back in the mounting cavity through the spring.
The second connecting piece 6 comprises a second mounting block 601 and an anchor rod 602 arranged on the second mounting block, the front end of the anchor rod is provided with a cap head 603, and the cap head 603 is used for being inserted into the accommodating cavity 507 to realize butt joint of the first connecting piece and the second connecting piece.
Further, after the cap 603 of the second connector 6 is vertically inserted into the accommodating cavity 507 of the first connector 5, the cap is limited by the elastic retractable locking pin 504 on the first connector 5; the distance between the cap 603 and the locking pin 504 in the vertical direction is L, so as to enable the relative movement between the first preform 1 and the second preform 2 in the vertical direction, wherein L is greater than 0.
As shown in fig. 11, specifically, the distance between the first limit working surface 506 of the lock head and the second limit working surface 604 of the bottom surface of the cap head 603 is L (i.e., the minimum distance between the lock pin and the cap head in the vertical direction is L), which is set to allow the cap head to move in the accommodating cavity by L; after the butt joint of the first prefabricated member and the second prefabricated member is finished, if explosion impact is generated inside the box culvert, the first prefabricated member can move upwards by the distance L under the action of the explosion impact so as to absorb certain impact wave energy; the lock pin limits the cap head, so that the first prefabricated member and the second prefabricated member can be prevented from being separated due to explosion impact.
Referring to fig. 2 to 6, the first prefabricated member 1 includes a first concrete layer and a first reinforcement cage disposed inside the first concrete layer; the first prefabricated member is formed by pouring, and the first concrete layer and the first steel reinforcement framework form an integrated structure after pouring and hardening.
Further, the first reinforcement cage comprises a first longitudinal rib 107, a corrugated plate 108 and a first annular reinforcement 106 with an inverted concave shape; the first annular steel bar 106 comprises a connecting steel bar section A, an outer steel bar section A and an inner steel bar section A, wherein the outer steel bar section A and the inner steel bar section A are of n type, and the outer steel bar section A is positioned on the outer side of the inner steel bar section A and is connected with the vertical section ends of the inner steel bar section A through the connecting steel bar section A. In practical application, the first annular steel bar is of an integrated structure, namely, the connecting steel bar section A, the outer steel bar section A and the inner steel bar section A are obtained by bending one steel bar and then welding the heads and the tails of the steel bars; of course, it is also possible in some embodiments to weld the three sections of rebar of connecting rebar segment A, outer rebar segment A, and inner rebar segment A to obtain a first looped rebar.
Specifically, the plurality of first annular steel bars 106 are arranged at intervals along the longitudinal direction, and the outer steel bar segments a are connected by a plurality of first longitudinal bars 107 arranged at intervals, where in this embodiment, the first longitudinal bars 107 are located on the outer side surface (i.e., the side far from the inner steel bar segment a) of the outer steel bar segment a; the buckled plate 108 sets up on each inboard reinforcing bar section A and its one side that is located and is close to outside reinforcing bar section A, the both ends of buckled plate 108 are connected with two vertical sections of inboard reinforcing bar section A respectively, be equipped with the through-hole 114 that is used for the concrete to flow on the buckled plate 108, realize through the through-hole that the concrete can flow to the below of buckled plate, prevent the phenomenon of cavity from appearing in the below of buckled plate.
Specifically, the corrugated plate can enhance the impact strength of the whole structure; upon receiving an blast impact, the corrugated plate 108 will undergo some tensile deformation, absorb the impact wave energy, and redistribute the forces to the concrete above the plate.
Further, in this embodiment, the corrugated board 108 is made of three layers of composite steel plates, the middle layer is made of foamed aluminum plate, and the two sides are made of pressed galvanized steel plates, and epoxy structural adhesive is smeared between the layers to firmly bond the composite boards. The corrugated plate 108 stress can play a role in force redistribution, the influence that the impact wave continuously damages the box culvert after the impact wave tears the surface concrete in the existing box culvert design structure is reduced, the possibility that the bearing capacity of the collapse section of the whole box culvert structure is lost is prevented, the middle-layer foamed aluminum plate stress can be compressed within a certain range, and the energy brought by the explosion impact wave is absorbed.
Preferably, in this embodiment, the fixing plate 110 is disposed at the upper end of the inner side of the vertical section, the end of the corrugated plate is located at the upper end of the outer side of the vertical section (i.e., one side close to the outer side of the steel bar section a), and the corrugated plate and the fixing plate are locked by a bolt assembly, and the bolt assembly can adopt a locknut to prevent looseness between the corrugated plate and the fixing plate. Of course, it is also possible in some embodiments to weld the ends of the corrugated sheets to the upper ends of the vertical sections of the inner rebar segment A. Also, in some embodiments, the ends of the corrugated plates may be fixedly connected to the lower ends of the vertical sections of the inner rebar segment A.
Referring to fig. 4 and 5, the first reinforcement cage further includes reinforcement ribs 109, and the reinforcement ribs 109 are respectively disposed at two right angles of the first annular reinforcement 106, so as to enhance the overall performance of the first reinforcement cage; in this embodiment, the reinforcing ribs 109 penetrate through the end portions of the corrugated plates, and two ends of the reinforcing ribs are respectively bound and connected with the inner reinforcing steel bar section a and the outer reinforcing steel bar section a of the same first annular reinforcing steel bar.
Specifically, in actual design, the reinforcing ribs 109 may be disposed at two right angles of each first annular reinforcing bar, or the reinforcing ribs 109 may be disposed at intervals between the first annular reinforcing bars, that is, the reinforcing ribs are disposed on the current first annular reinforcing bar, and the reinforcing ribs are not disposed on the next first annular reinforcing bar; the former setting mode first reinforcement cage's structural strength can be slightly better, and the latter setting mode then can be more economical.
With continued reference to fig. 4 and 5, the first reinforcement cage further includes a plurality of hollow bars 111 arranged in a longitudinal direction, wherein the hollow bars 111 are transversely arranged in a gap between two adjacent first annular reinforcing bars 106 and are located above the corrugated plates; the two ends of the hollow rod 111 are respectively bound and connected to the first longitudinal ribs 107 at the highest positions on the two vertical sections of the outer steel bar section A. Specifically, flange rings are arranged at two ends of the hollow rod, so that the hollow rod and the first longitudinal ribs 107 can be conveniently bound. In practical application, the hollow rod can correspond to the reinforcing rib, and the end of the hollow rod and the end of the reinforcing rib can be bound and fixed with the first longitudinal rib 107 and the first annular steel bar 106 at the highest position of the vertical section of the outer steel bar section A.
Further, the hollow rod 111 is filled with aluminum foam, is easily compressed and greatly deformed under the stress condition, forms an integral structure with the roof concrete, and can absorb the energy transmitted by the corrugated plate. In the embodiment, the foamed aluminum is made of pure aluminum with the yield strength of 20-30 mpa, and the size of the foam holes is about 2 mm.
Preferably, reinforcing steel bar meshes are arranged on the upper surface of the first steel bar framework in a pair angle manner, so that local reinforcement of a top plate of the box culvert is realized, and damage to the box culvert structure caused by stress concentration during oblique jacking of the box culvert is prevented, so that the box culvert is suitable for various different construction working conditions. Specifically, the reinforcing steel bar mesh comprises reinforcing longitudinal ribs 112 and reinforcing transverse ribs 113, wherein a plurality of reinforcing transverse ribs 113 are arranged at intervals in the longitudinal direction, and a plurality of reinforcing longitudinal ribs 112 are arranged on the reinforcing transverse ribs 113 at intervals in the transverse direction.
Further, a lifting hook 4 is arranged at the corner of the upper surface of the first reinforcement cage; the lower extreme of lifting hook 4 colludes with the ligature node department of first annular reinforcing bar and first longitudinal bar, and the lifting hook exposes in the outside of first concrete layer after the shaping of first prefabrication concrete placement for hoist and mount first prefabrication.
Referring to fig. 7 to 9, the second preform includes a second concrete layer and a second reinforcement cage disposed inside the second concrete layer; the second prefabricated member is formed by pouring, and the second concrete layer and the second reinforcement cage form an integrated structure after pouring and hardening. The second reinforcement cage comprises a second longitudinal reinforcement 206 and a concave-shaped second annular reinforcement 205; the second annular steel bar 205 comprises a connecting steel bar section B, an outer steel bar section B and an inner steel bar section B, wherein the outer steel bar section B and the inner steel bar section B are both n-shaped, the outer steel bar section B is positioned at the outer side of the inner steel bar section B, and the ends of the vertical sections of the outer steel bar section B and the inner steel bar section B are connected through the connecting steel bar section B; the plurality of second annular reinforcing bars 205 are arranged at intervals in the longitudinal direction and the outer reinforcing bar segments B are connected by a plurality of second longitudinal bars 206 arranged at intervals.
Referring to fig. 6, the first reinforcement cage further includes a first joint rib 104 and a first installation longitudinal rib 115; each connecting steel bar section A is connected through a plurality of first installation longitudinal ribs 115, and the first connecting piece 5 is arranged on each first installation longitudinal rib 115; a plurality of first lap joint ribs 104 are longitudinally arranged on two sides of the first connecting piece 5, and the connecting parts of the first lap joint ribs 104 are connected with the connecting steel bar section A; specifically, the first mounting block 501 in the first connecting piece 5 is provided with semicircular grooves, the number of the semicircular grooves is identical to that of the first mounting longitudinal ribs 115, and the first mounting block is clamped on the first mounting longitudinal ribs 115 through the semicircular grooves and welded, so that the first connecting piece is fixed on the first mounting longitudinal ribs 115.
Referring to fig. 9, the second reinforcement cage further includes a second bridging rib 201 and a second mounting longitudinal rib 207; the connecting steel bar segments B are connected through a plurality of second installation longitudinal ribs 207, and the second connecting pieces 6 are arranged on the second installation longitudinal ribs 207; a plurality of second bridging ribs 201 are longitudinally arranged on two sides of the second connecting piece 6, and the connecting parts of the second bridging ribs 201 are connected with the connecting steel bar section B. Specifically, the second mounting block 601 of the second connecting piece is provided with semicircular grooves, the number of the semicircular grooves is consistent with that of the second mounting longitudinal ribs 207, and the second mounting block is clamped on the second mounting longitudinal ribs 207 through the semicircular grooves and welded, so that the second connecting piece is fixed on the second mounting longitudinal ribs.
Referring to fig. 2, 3 and 7, the connecting end of the first prefabricated member 1 (i.e. the connecting end of the side plate a) is provided with a first receiving cavity 105, and the lap joint portion of the first lap joint rib 104 and the butt joint portion of the first connecting piece 5 (the lower portion of the connecting rod 502 and the annular block 503, i.e. the portion participating in butt joint with the second connecting piece) are both located in the first receiving cavity 105; the connecting end of the second prefabricated member 2 (i.e. the connecting end of the side plate B) is provided with a second receiving cavity 204 corresponding to the first receiving cavity 105, and the lap joint portion of the second lap joint rib 201 and the butt joint portion of the second connecting member 6 (the upper portion of the anchoring rod 602 and the cap 603, i.e. the portion participating in butt joint with the first connecting member) are both located in the second receiving cavity 204.
Preferably, the first prefabricated member 1 is provided with a grouting hole 101 communicated with the first receiving cavity 105, and concrete is injected into the first receiving cavity and the second receiving cavity which are in butt joint through the grouting hole. In order to ensure that the concrete slurry can be smoothly injected into the first receiving cavity and the second receiving cavity, in this embodiment, the grouting hole 101 is an inclined hole and is in a circular truncated cone shape, a small caliber end of the grouting hole is communicated with the first receiving cavity and is tangential to the top surface of the first receiving cavity, the second receiving cavity is filled with the slurry during grouting, and the grouting hole is tangential to the top surface of the first receiving cavity so as to ensure that the slurry can be completely filled in the first receiving cavity.
After the first prefabricated member and the second prefabricated member are in butt joint, the lap joint part of the first lap joint rib and the lap joint part of the second lap joint rib are close together and form a concrete reinforcing steel bar structure with injected concrete, so that the damage of lateral soil pressure to a box culvert structure is prevented, and the connection between the first prefabricated member and the second prefabricated member is ensured to be more stable; in this embodiment, the first and second joint ribs are both L-shaped or T-shaped. Further preferably, the overlapping portion of the first overlapping rib extends to contact with the bottom surface of the second receiving cavity, and the overlapping portion of the second overlapping rib extends to contact with the top surface of the first receiving cavity.
Referring to fig. 2, 3 and 7, the first receiving chamber 105 and the second receiving chamber 204 are quickly positioned by a groove and bump fit. Specifically, in this embodiment, the first receiving cavity is provided with a first limiting groove 102 and a second limiting groove 103 along two longitudinal sides, and the second receiving cavity is provided with a first positioning bump 202 and a second positioning bump 203 along two longitudinal sides, where the first limiting groove and the first positioning bump are arranged in a matching manner, and the second limiting groove 103 and the second positioning bump 203 are arranged in a matching manner. Preferably, the arrangement number of the grooves and the bumps can be set according to actual situations, and the positioning mode of the grooves and the bumps can also be set according to actual situations. In this embodiment, the cooperation of the first limiting groove and the first positioning lug only constrains longitudinal limitation, and the cooperation of the second limiting groove and the second positioning lug can constrain longitudinal and transverse limitation.
Referring to fig. 1 and 7, four right angles of the outer side of the second prefabricated member are respectively provided with a right angle limiting member 3, the right angle limiting members 3 are installed on the second prefabricated member through expansion bolts, the upper ends of the right angle limiting members 3 are provided with outward 10-degree chamfers, the area surrounded by the inner sides of the four right angle limiting members is larger than the cross-sectional area of the first prefabricated member on the transverse and longitudinal planes, and the first prefabricated member can be conveniently and smoothly inserted into the four right angle limiting members 3 to be in butt joint with the second prefabricated member.
Preferably, in this embodiment, the first concrete layer is poured with a fiber reinforced composite material (i.e., steel fiber concrete), and the first prefabricated member is obtained by adding explosion-proof steel fibers into ordinary concrete, so that cracking of the scattered steel fibers can be reduced, and the first prefabricated member has stronger shearing resistance. And the second concrete layer is poured by C30 concrete, so that the construction cost is reduced while the structural strength is ensured.
Preferably, the grouting holes in the embodiment are filled with quick-drying high-fluidity cement mortar, so that smooth injection of the mortar can be ensured, the mortar can be quickly solidified to reach required strength, and the connection stability of the first prefabricated member and the second prefabricated member is ensured.
Preferably, in this embodiment, the first connecting piece and the second connecting piece are both prefabricated by adopting low-carbon high-strength steel with yield strength above 300mpa, and have better elasticity and higher strength, and are integrally formed through prefabrication and assembly.
Preferably, in the embodiment, the steel bars are made of HPB400 steel, the diameters of the steel bars are obtained through calculation and design, the steel bars have good tensile property, and the steel bars are used as a stiffness framework of an explosion-proof and impact-proof structure, so that the defect of weak tensile mechanical property of concrete is overcome, and the overpressure peak value of explosion shock waves is weakened.
Preferably, L is not less than 0 and not more than 100mm in the present embodiment, and more preferably not less than 0 and not more than 50mm. Generally, L is determined according to the thickness of the upper soil layer jacked into the box culvert, so that the stability of the railway on the soil layer is not affected after the upper soil layer is compressed; when the concrete binding force poured by the grouting holes between the first prefabricated part and the second prefabricated part is lost, the structural stability is ensured by the soil pressure above the first prefabricated part and the connecting assembly, and the allowable compression amount of the soil above (namely, the fact that the track is not damaged) is the same as the L value.
The working principle of the box culvert of the embodiment is as follows:
the first prefabricated member and the second prefabricated member are transported to the site after being prefabricated in a factory, can be assembled rapidly, and are constructed by directly adopting a jacking method after forming an integral box culvert structure.
Under normal use state, the stability of box culvert structure can be guaranteed through the structure that framework of steel reinforcement and concrete formed. After being subjected to blasting impact load, the concrete layer of the top plate of the first prefabricated member (the concrete layer facing the space inside the box culvert) is of a first layer impact structure, and a certain deformation and peeling can be generated under the blasting impact and the force is transmitted to a second layer impact structure. The corrugated board is a secondary impact structure that redistributes the forces to the concrete above (i.e., behind) the corrugated board, while the foam aluminum panels in the corrugated board also compress to a maximum extent. The steel reinforcement framework formed by the concrete, the reinforcing ribs, the first annular steel bars, the first longitudinal ribs, the hollow rods and the reinforcing steel bar net above the corrugated plate is of a third layer of impact structure, so that the last line of defense for ensuring the structural stability is realized.
Meanwhile, the anti-impact capability of the box culvert structure can be greatly enhanced due to the arrangement of the first connecting piece and the second connecting piece, when the first connecting piece and the second connecting piece are assembled, a distance L is reserved between the cap head and the lock pin in the vertical direction, and when explosion impact is received, the first prefabricated member has an upward moving space with the distance L, so that certain impact wave energy can be absorbed, and the stability of the structure is ensured.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The prefabricated single-hole explosion-proof box culvert is characterized by comprising a first prefabricated member (1) and a second prefabricated member (2) positioned below the first prefabricated member (1), wherein the first prefabricated member (1) and the second prefabricated member (2) are connected through a plurality of groups of connecting components;
The first prefabricated member (1) comprises a top plate and side plates A positioned at two sides of the top plate, the top plate and the two side plates A form a concave shape, the second prefabricated member (2) comprises a bottom plate and side plates B positioned at two sides of the bottom plate, the bottom plate and the two side plates B form a concave shape, and the first prefabricated member and the second prefabricated member are in butt joint to form a complete box culvert;
The connecting assembly comprises a first connecting piece (5) and a second connecting piece (6); the butt joint end of the side plate A is longitudinally provided with a plurality of first connecting pieces (5), and the butt joint end of the side plate B is longitudinally correspondingly provided with a plurality of second connecting pieces (6);
The first connecting piece (5) comprises a first mounting block (501), a connecting rod (502) and an annular block (503), wherein the two ends of the connecting rod (502) are respectively connected with the first mounting block (501) and the annular block (503), and the first mounting block (501) is used for realizing the connection between the first connecting piece (5) and a first prefabricated member; the annular block (503) is provided with a containing cavity (507) and an installation cavity communicated with the containing cavity is formed in the annular block (503), a lock pin (504) is arranged in the installation cavity, a spring (505) is sleeved on the lock pin (504), one end of the spring props against the inner wall of the installation cavity, the other end of the spring props against a lock head at the front end of the lock pin, and meanwhile, the tail end of the lock pin (504) is provided with a limiting block, so that the lock pin cannot be separated from the installation cavity, and elastic expansion and contraction of the lock pin in the installation cavity are realized through the spring;
the second connecting piece (6) comprises a second mounting block (601) and an anchor rod (602) arranged on the second mounting block, and the front end of the anchor rod is a cap head (603);
the cap head (603) of the second connecting piece (6) is vertically inserted into the accommodating cavity (507) of the first connecting piece (5) and then limited by an elastically telescopic lock pin (504) on the first connecting piece (5); the distance between the cap head (603) and the lock pin (504) in the vertical direction is L, so that the first prefabricated part (1) and the second prefabricated part (2) can move vertically relatively, wherein L is larger than 0;
when explosion impact is generated in the box culvert, the first prefabricated member moves upwards by the distance L under the action of the explosion impact so as to absorb part of impact wave energy.
2. The prefabricated single-hole explosion-proof box culvert according to claim 1, characterized in that the first prefabricated member (1) comprises a first concrete layer and a first reinforcement cage arranged inside the first concrete layer; the first reinforcement cage comprises first longitudinal ribs (107), corrugated plates (108) and inverted-concave first annular reinforcement bars (106); the first annular steel bar (106) comprises a connecting steel bar section A, an outer steel bar section A and an inner steel bar section A which are both n-shaped, wherein the outer steel bar section A is positioned at the outer side of the inner steel bar section A, and the ends of the vertical sections of the outer steel bar section A and the inner steel bar section A are connected through the connecting steel bar section A; the first annular steel bars (106) are longitudinally arranged at intervals, and the outer steel bar sections A are connected through first longitudinal bars (107) which are arranged at intervals; the corrugated plates (108) are arranged on the inner side reinforcing steel bar sections A and are located on one side close to the outer side reinforcing steel bar sections A, two ends of each corrugated plate (108) are connected with two vertical sections of the inner side reinforcing steel bar sections A respectively, and through holes (114) for concrete to flow through are formed in the corrugated plates (108).
3. The prefabricated single-hole explosion-proof box culvert according to claim 2, wherein the first reinforcement cage further comprises reinforcing ribs (109), and reinforcing ribs (109) are respectively arranged at two right angles of the first annular reinforcing steel bars (106); the reinforcing ribs (109) penetrate through the corrugated plates, and the two ends of the reinforcing ribs are respectively connected with the inner side reinforcing steel bar section A and the outer side reinforcing steel bar section A of the same first annular reinforcing steel bar.
4. A prefabricated single-hole explosion-proof box culvert according to claim 3, wherein the first reinforcement cage further comprises a plurality of hollow rods (111) arranged in a longitudinal direction, and the hollow rods (111) are transversely arranged in gaps between two adjacent first annular reinforcement bars (106); two ends of the hollow rod (111) are respectively connected to the first longitudinal bars (107) at the highest positions of the two vertical sections of the outer steel bar section A.
5. The prefabricated single-hole explosion-proof box culvert according to claim 4, characterized in that the hollow rod (111) is internally filled with foamed aluminum.
6. The prefabricated single-hole explosion-proof box culvert of claim 2, wherein reinforcing steel bar meshes are arranged on the upper surface of the first steel bar framework in a pair of corners; and a lifting hook (4) is arranged at the corner of the upper surface of the first reinforcement cage.
7. The prefabricated single-hole explosion-proof box culvert according to any one of claims 2-6, wherein the second prefabricated member comprises a second concrete layer and a second reinforcement cage arranged inside the second concrete layer; the second reinforcement cage comprises second longitudinal ribs (206) and concave-shaped second annular reinforcement bars (205); the second annular steel bar (205) comprises a connecting steel bar section B, an outer steel bar section B and an inner steel bar section B, wherein the outer steel bar section B and the inner steel bar section B are both n-shaped, the outer steel bar section B is positioned at the outer side of the inner steel bar section B, and the ends of the vertical sections of the outer steel bar section B and the inner steel bar section B are connected through the connecting steel bar section B; the second annular steel bars (205) are longitudinally arranged at intervals, and the outer steel bar sections B are connected through the second longitudinal bars (206) arranged at intervals.
8. The prefabricated single-hole explosion-proof box culvert of claim 7, wherein the first reinforcement cage further comprises a first lap joint rib (104) and a first installation longitudinal rib (115); each connecting steel bar section A is connected through a plurality of first mounting longitudinal ribs (115), and the first connecting piece (5) is arranged on each first mounting longitudinal rib (115); a plurality of first lap joint ribs (104) are longitudinally arranged on two sides of the first connecting piece (5), and the connecting parts of the first lap joint ribs (104) are connected with the connecting steel bar section A;
The second reinforcement cage further comprises a second lap joint rib (201) and a second installation longitudinal rib (207); the connecting steel bar segments B are connected through a plurality of second installation longitudinal ribs (207), and the second connecting pieces (6) are arranged on the second installation longitudinal ribs (207); and a plurality of second lap joint ribs (201) are longitudinally arranged on two sides of the second connecting piece (6), and the connecting parts of the second lap joint ribs (201) are connected with the connecting steel bar section B.
9. The prefabricated single-hole explosion-proof box culvert according to claim 8, wherein a first receiving cavity (105) is arranged at the connecting end of the first prefabricated member (1), and the lap joint part of the first lap joint rib (104) and the butt joint part of the first connecting piece (5) are both positioned in the first receiving cavity (105);
the connecting end of the second prefabricated member (2) is provided with a second bearing cavity (204) corresponding to the first bearing cavity (105), and the lap joint part of the second lap joint rib (201) and the butt joint part of the second connecting piece (6) are both positioned in the second bearing cavity (204);
And the first prefabricated member (1) is provided with a grouting hole (101) communicated with the first bearing cavity (105), and concrete is injected into the first bearing cavity and the second bearing cavity which are in butt joint through the grouting hole.
10. The prefabricated single-hole explosion-proof box culvert according to claim 9, characterized in that the first receiving cavity (105) and the second receiving cavity (204) are quickly positioned through matching of grooves and bumps; four right angles outside the second prefabricated member are provided with right angle limiting pieces (3).
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| CN218265176U (en) * | 2022-10-27 | 2023-01-10 | 中铁一局集团有限公司 | Safety protection shed frame for tunnel blasting |
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| CN103233431A (en) * | 2013-04-15 | 2013-08-07 | 南京联众建设工程技术有限公司 | Reinforced culvert |
| CN209179263U (en) * | 2018-10-18 | 2019-07-30 | 四川鸿成佳建筑工程有限责任公司 | A kind of building curtain wall with anti-seismic structure |
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| CN110984009A (en) * | 2019-12-18 | 2020-04-10 | 江西赣瓷科技有限公司 | U-shaped combined concrete prefabricated box culvert |
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| CN117364676A (en) | 2024-01-09 |
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