CN112227275A - Replaceable foam concrete filled honeycomb pier anti-explosion device and mounting method thereof - Google Patents
Replaceable foam concrete filled honeycomb pier anti-explosion device and mounting method thereof Download PDFInfo
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- CN112227275A CN112227275A CN202011069143.XA CN202011069143A CN112227275A CN 112227275 A CN112227275 A CN 112227275A CN 202011069143 A CN202011069143 A CN 202011069143A CN 112227275 A CN112227275 A CN 112227275A
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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
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/14—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands
- E01F15/141—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands for column or post protection
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/14—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands
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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses an anti-explosion device for a replaceable foam concrete filled honeycomb pier and an installation method thereof, wherein the anti-explosion device for the pier comprises: the energy-saving panel comprises a honeycomb energy-consumption core layer filled with foam concrete, an explosion-facing panel, a positioning foam concrete filled steel pipe, a connecting piece and a bolt, wherein the core layer consists of a hexagonal cell honeycomb framework and foam concrete filled inside, and the core layer is connected with the panel through the bolt. And bolts are inserted into through bolt holes reserved in the explosion-facing panel, the positioning steel pipe and the connecting piece, so that the device is integrated. In explosion, the core layer can be compressed to absorb explosion energy, and the energy and peak load transmitted to the bridge pier are reduced. If damage occurs in the anti-explosion protection process of the pier, the damaged part can be directly replaced, and the economic cost and the time cost are greatly reduced compared with the pier maintenance. And the used materials are light in weight, energy-saving and environment-friendly, simple to manufacture, convenient to transport and install and easy to operate.
Description
Technical Field
The invention relates to the technical field of pier anti-explosion protection, in particular to an alternative foam concrete filled honeycomb pier anti-explosion device and an installation method thereof.
Background
The urban bridge is used as an important junction in traffic engineering and is damaged or collapsed under the action of explosion caused by terrorist attack and accidents. And explosion load is powerful in damage, so that the bridge pier is often damaged difficultly to repair. Therefore, the method has important significance and practicability for research on anti-explosion protection of the bridge pier.
At present, the explosion protection of the existing bridge pier mainly adopts a method of wrapping fiber reinforced composite materials and steel boxes, so that the integral rigidity of the bridge pier can be improved, and the damage of the bridge pier can be reduced. However, in the contact explosion mode such as an automobile bomb, the peak value of the explosion load acting on the bridge pier is high, and great local damage can be caused to the bridge pier. The replaceable foam concrete filled honeycomb hanging plate device is used for pier antiknock, the load peak value acting on a pier under explosion can be reduced, the hanging plate core layer absorbs part of explosion energy in the compression process, the explosion energy transmitted to the pier can be reduced, the device is an effective antiknock protection device, meanwhile, the device is easy to install and replace, and waste of manpower, material resources and financial resources can be greatly reduced.
Disclosure of Invention
The invention aims to provide an anti-explosion pier protection device which can reduce the explosion damage of a pier and is easy to install and replace and an installation method thereof. The cellular hanging plate filled with the foam concrete is installed on the surface of the pier, and under the action of an explosive load, the hanging plate can absorb part of explosive energy, so that peak load and energy transmitted to the pier are reduced, and the damage to the pier is reduced. Meanwhile, the hanging plate of the device can be directly replaced for the damaged part after being damaged by explosive load, the installation is simple and convenient, and the economic advantage is obvious compared with the maintenance and repair of the bridge pier.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a replaceable foam concrete filled cellular pier anti-explosion device is composed of a rectangular hanging plate, a positioning foam concrete filled steel tube, a connecting piece and a bolt.
In the scheme, the anti-explosion pier protection device is suitable for piers with rectangular sections, and in order to facilitate manufacturing and installation, the whole device is formed by splicing four rectangular hanging plates and four positioning foam concrete filled steel tubes through connecting pieces. The four foam concrete filled honeycomb hanging plates are placed on four side faces of the pier with the rectangular cross section, and the four positioning foam concrete filled steel tubes are placed at four corners of the pier with the rectangular cross section; the rectangular hanging plate consists of a foam concrete filled honeycomb energy dissipation core layer and an explosion facing panel, bolt holes are reserved in the explosion facing panel, and the explosion facing panel is connected with the foam concrete filled honeycomb core layer through bolts; placing and positioning a foam concrete filled steel tube fixing core layer at the corner of the pier with the rectangular section; and bolt holes are reserved on the positioning steel pipes relative to the positions of the piers with the rectangular sections, and the bolts penetrate through the bolt holes reserved on the connecting pieces, the explosion-facing panel and the positioning foam concrete filled steel pipes to form a whole.
The foam concrete filled honeycomb energy dissipation core layer consists of core layer filled foam concrete and a core layer honeycomb framework; the cellular energy dissipation core layers filled with the foam concrete are enclosed outside the rectangular-section reinforced concrete bridge pier, and the cellular energy dissipation core layers filled with the foam concrete are of a connecting structure between the cellular framework 22 of the core layers and the rectangular-section reinforced concrete bridge pier.
In the scheme, the honeycomb is an aluminum honeycomb;
in the scheme, the explosion-facing panel, the positioning steel pipe and the connecting piece are all made of high-strength steel.
In the scheme, the explosion-facing panel can ensure that the stress is transmitted to the core layer more uniformly, more importantly, the quality of the explosion-facing panel determines the energy transmitted to the foam concrete filled honeycomb core layer, and for a specific explosion, the energy obtained by the panel can be calculated by the following formula:
wherein EwThe energy obtained by the cladding panel in explosion is I, the impulse acting on the explosion-facing panel under specific explosion is a constant value, m is the mass of the explosion-facing panel, and the formula (1) shows that the energy transmitted to the core layer is reduced along with the increase of the mass of the panel, the energy transmitted to the pier is reduced along with the reduction of the energy, and the damage degree of the pier is reduced. However, in practical construction application, the economy and the practicability need to be balanced, so that the panel thickness is properly selected according to the specific pier size and the expected explosion-proof effect.
In the scheme, the foam concrete filled honeycomb combined core layer is a main energy absorption member of the device. The honeycomb is made by a forming method, firstly pressing original aluminum sheets into a half hexagon, then overlapping the materials, coating adhesive materials to stick the materials together, and finally stretching and forming, wherein the out-of-plane compression deformation mode is mainly folded and bent. Foamed concrete is made under controlled conditions with cement, water and a foaming agent, the compression failure mode of which is dominated by crushing. Pouring the foam concrete slurry into a prepared honeycomb, vibrating uniformly, and curing for a predetermined age under standard conditions to obtain the foam concrete filled honeycomb combined core layer. In the compression process of the cellular core layer filled with the foam concrete, the aluminum honeycomb restrains the crushing of the foam concrete, meanwhile, the folding and buckling of the aluminum honeycomb is restrained by the foam concrete, and the compression strength of the combined core layer is higher than the sum of the individual compression strengths of the two materials due to the interaction of the aluminum honeycomb and the foam concrete. Compared with other polymer foams such as polyurethane foam and polystyrene foam filled honeycomb composite structures, the foam concrete filled honeycomb composite structure has the advantages of convenience in construction, low manufacturing cost, energy conservation, environmental friendliness and the like, the platform stress is greatly improved, more explosion energy can be absorbed, and the foam concrete filled honeycomb composite structure is more suitable for pier anti-explosion protection.
In the scheme, the controllability of the compression strength range of the core layer is realized through the combination of the foam concrete with different densities and the honeycombs with different specifications. The compressive strength of the honeycomb and the restraining capability of the foam concrete can be changed by changing the wall thickness and the pore size of the honeycomb cells, and the compressive strength and the resistance to the folding and buckling of the honeycomb can also be changed by changing the density of the foam concrete. In actual engineering, the combination of foam concrete with different densities and honeycombs with different specifications can be selected according to different situations to exert the maximum performance of the device. And the two materials are light in weight, environment-friendly, convenient to install and low in cost, and can be produced in a large scale.
In the scheme, the foam concrete filled honeycomb combined hanging plate is installed on the surface of the pier, so that the contact between the pier and the external environment can be reduced, and the durability of the pier is improved. Meanwhile, the polyurea elastomer material can be coated on the explosion-facing surface of the hanging plate, so that the durability of the hanging plate of the device is improved, and the deformation capacity and the energy absorption capacity of the hanging plate are also improved. When the bridge pier is damaged under the action of the explosive load, the bridge pier can be quickly replaced, and the time cost and the economic cost of pier maintenance are reduced.
Overall, the invention has the following advantages:
(1) according to the invention, the foam concrete filled honeycomb core layer absorbs explosion energy, the honeycomb restrains the foam concrete from being crushed in the compression process of the foam concrete filled honeycomb core layer, the foam concrete hinders the folding and buckling of the honeycomb, and the foam concrete and the honeycomb core layer cooperate to greatly improve the platform stress of the combined core layer. Meanwhile, the combined core layer enables peak load acting on the bridge pier to be converted from reflection overpressure acting on the bridge pier through explosion into platform stress of the combined core layer, and the peak load is greatly reduced. In the compression process, the combined core layer absorbs energy generated by explosion through large deformation, so that the energy finally transmitted to the pier is greatly reduced compared with the situation of no device protection. Therefore, the invention can play a good protection effect on the bridge pier from the load and energy angles in explosion.
(2) The energy transmitted to the cladding layer of the hanging plate can be adjusted by adjusting the thickness of the panel of the hanging plate, and the strength of the cladding layer can be changed by adjusting the density of foam concrete of the cladding layer and the specification of a honeycomb, so that the controllability of the strength and the energy absorption capacity of the whole hanging plate is achieved. Different combinations of the honeycomb, the foam concrete and the panel are selected according to different application conditions, and the maximization of the practicability and the economy is realized.
(3) If the device damages the explosion load in the protection process, the damaged part can be directly replaced, and the economic cost and the time cost are greatly reduced compared with the pier maintenance. And the used materials are light in weight, energy-saving and environment-friendly, simple to manufacture, convenient to transport and install and easy to operate.
Drawings
Fig. 1 is a schematic view of an anti-explosion device for a bridge pier and a structure of the bridge pier.
Fig. 2 is a partially enlarged view of a pier antiknock device link plate according to the present invention.
Fig. 3 is a schematic view of positioning foam concrete filled steel tubes of the pier anti-knock device of the present invention.
Fig. 4 is an installation schematic view of the pier antiknock device of the present invention.
In all the drawings, the same component numbers indicate the same members or materials, wherein 1 is a reinforced concrete pier, 2 is a foam concrete filled honeycomb core layer, 3 is a positioning foam concrete filled steel pipe, 4 is an explosion facing panel, 5 is a connecting piece, 6 is a bolt, 21 is a core layer filled foam concrete, 22 is a core layer honeycomb framework, 31 is a positioning steel pipe filled with foam concrete, and 32 is a positioning steel pipe.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the invention relates to a replaceable foam concrete filled honeycomb pier anti-explosion device, which comprises a foam concrete filled honeycomb core layer 2, a positioning foam concrete filled honeycomb steel pipe 3, an explosion facing panel 4, a connecting piece 5 and a bolt 6. Whole rectangle pier is surrounded by four link plates, and the link plate includes foam concrete filling honeycomb sandwich layer 2 and meets and explode panel 4 two parts, and two parts pass through bolted connection. The positions of the adjacent hanging plates relative to the pier are fixed through positioning the foam concrete filled steel tubes, and the corners are connected through the connecting pieces and the bolts to enable the device to be closed into a whole. As shown in fig. 2, the cellular core layer filled with foam concrete is composed of foam concrete 21 and a hexagonal cell aluminum cellular framework 22, bolt holes are reserved in the panel, and the explosion-facing panel and the core layer are connected and fixed by using bolts. The schematic diagram of the positioning foam concrete filled steel tube is shown in fig. 3, and the positioning foam concrete filled steel tube consists of foam concrete and a steel tube with reserved bolt holes. The connecting piece, the explosion-facing panel and the positioning foam concrete filled steel tube are fixedly connected by inserting bolts into the reserved bolt holes.
After the explosion happens, the explosion shock wave reaches the foam concrete filled honeycomb pier anti-explosion device, firstly acts on an explosion facing panel, the panel obtains explosion energy and then compresses a core layer, the core layer absorbs the explosion energy through large deformation, in the compression process, the foam concrete and the honeycomb are mutually constrained to prevent the opposite deformation and damage, the load transmitted to the pier in the process is the platform stress of the core layer, and the value of the platform stress is greatly reduced relative to the explosion peak load. And the core layer absorbs part of the explosion energy in the compression process, so that the explosion energy and the peak load which are finally transmitted to the bridge pier are reduced. Meanwhile, the positioning foam concrete filled steel tube arranged at the corner position has double functions, on one hand, the positioning foam concrete filled steel tube can keep the position of the hanging plate relative to the pier, on the other hand, the steel tube is subjected to plastic deformation under the action of an explosion load, the internal foam concrete is compressed, the mechanism of interaction between the honeycomb and the foam concrete is the same as that in the compression process of the foam concrete filled honeycomb core layer in the deformation processes of the steel tube and the foam concrete, namely, the steel tube restrains the deformation of the foam concrete, the foam concrete simultaneously hinders the plastic deformation of the steel tube, the positioning foam concrete filled steel tube can absorb part of explosion energy in the deformation process under the interaction of the foam concrete filled steel tube and the foam concrete filled steel tube, and.
Examples
The replaceable foam concrete filled honeycomb pier anti-explosion device comprises four foam concrete filled honeycomb hanging plates arranged on the side faces of a pier, positioning foam concrete filled steel pipes arranged at corners, connecting pieces and bolts, wherein each hanging plate is composed of a foam concrete filled honeycomb core layer and an explosion facing panel. The hanging plate is composed of a foam concrete filled honeycomb core layer and an explosion facing panel, the two parts are connected through bolts, and bolt holes are reserved in the explosion facing panel when the explosion facing panel is manufactured. The positioning foam concrete filled steel tube has double functions, on one hand, the position of the hanging plate relative to the pier is fixed, on the other hand, the energy is absorbed in the explosion process, and the damage of the corner of the pier is reduced. Bolts are inserted into through bolt holes reserved in the connecting piece, the explosion-facing panel and the positioning steel pipe, so that the four hanging plates are integrated. The core layer consists of foam concrete and hexagonal cell honeycombs, and the strength and the energy absorption capacity of the core layer can be changed by changing the density of the foam concrete, the wall thickness of the honeycombs and the pore size. After the device is damaged by the explosion load, the damaged part of the device can be directly replaced, and the time cost and the economic cost of pier maintenance can be reduced.
The installation method of the replaceable foam concrete filled cellular pier anti-explosion device comprises the following steps as shown in fig. 4:
step 1: according to the size of the cross section of the pier, a foam concrete filled honeycomb core layer and an explosion facing panel which are matched with the size of the pier are prepared, bolt holes are reserved in the positions, close to the panel, of the panel, and the explosion facing panel and the foam concrete filled honeycomb core layer are connected and fixed through bolts.
Step 2: and (3) placing the 4 hanging plates on the surface of the pier to prepare a positioning foam concrete filled steel tube with a suitable size, reserving bolt holes communicated with the explosion-facing panel and the connecting piece in the steel tube, and placing the positioning foam concrete filled steel tube at four corners of the pier to form a closed rectangle together with the hanging plates.
And step 3: and placing an explosion-facing panel outside the positioning foam concrete filled steel pipe and the foam concrete filled honeycomb core layer.
And 4, step 4: the connecting piece is placed at the corner of the adjacent panel, and the bolt is inserted into the bolt hole through which the connecting piece, the explosion-facing panel and the positioning steel pipe are communicated, so that the device is integrated.
The present invention is described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and the above embodiments are only illustrative and not restrictive, and any modifications, equivalents, improvements and the like within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides an anti-knock device of honeycomb pier is filled to interchangeable foam concrete which characterized in that: the concrete-filled steel pipe is composed of a rectangular hanging plate, a positioning foam concrete filled steel pipe, a connecting piece and a bolt;
the pier anti-explosion protection device is suitable for piers with rectangular sections, and is formed by splicing four rectangular hanging plates and four positioning foam concrete filled steel tubes through connecting pieces for manufacturing and installation; the four foam concrete filled honeycomb hanging plates are placed on four side faces of the pier with the rectangular cross section, and the four positioning foam concrete filled steel tubes are placed at four corners of the pier with the rectangular cross section; the rectangular hanging plate consists of a foam concrete filled honeycomb energy dissipation core layer and an explosion facing panel, bolt holes are reserved in the explosion facing panel, and the explosion facing panel is connected with the foam concrete filled honeycomb core layer through bolts; placing and positioning a foam concrete filled steel tube fixing core layer at the corner of the pier with the rectangular section; and bolt holes are reserved on the positioning steel pipes relative to the positions of the piers with the rectangular sections, and the bolts penetrate through the bolt holes reserved on the connecting pieces, the explosion-facing panel and the positioning foam concrete filled steel pipes to form a whole.
2. The replaceable foam concrete filled cellular pier antiknock apparatus according to claim 1, wherein: the foam concrete filled honeycomb energy dissipation core layer consists of core layer filled foam concrete and a core layer honeycomb framework; the cellular energy dissipation core layers filled with the foam concrete are enclosed outside the rectangular-section reinforced concrete bridge pier, and the cellular energy dissipation core layers filled with the foam concrete are of a connecting structure between the cellular framework of the core layers and the rectangular-section reinforced concrete bridge pier.
3. The replaceable foam concrete filled cellular pier antiknock apparatus according to claim 1, wherein: the honeycomb is an aluminum honeycomb.
4. The replaceable foam concrete filled cellular pier antiknock apparatus according to claim 1, wherein: the explosion-facing panel, the positioning steel pipe and the connecting piece are all made of high-strength steel.
5. An installation method of the anti-explosion device for piers according to any one of claims 1 to 4, wherein: the method comprises the following steps:
step 1: preparing a foam concrete filled honeycomb core layer and an explosion facing panel which are matched with the size of the pier according to the size of the section of the pier, reserving bolt holes in the positions of the panel close to the edges, and connecting and fixing the explosion facing panel and the foam concrete filled honeycomb core layer through bolts;
step 2: placing the four hanging plates on the surface of the pier, preparing a positioning foam concrete filled steel tube with a proper size, reserving bolt holes which are communicated with the explosion-facing panel and the connecting piece on the steel tube, and placing the positioning foam concrete filled steel tube at four corners of the pier to form a closed rectangle with the hanging plates;
and step 3: placing an explosion-facing panel outside the positioning foam concrete filled steel pipe and the foam concrete filled honeycomb core layer;
and 4, step 4: the connecting piece is placed at the corner of the adjacent panel, and the bolt is inserted into the bolt hole through which the connecting piece, the explosion-facing panel and the positioning steel pipe are communicated, so that the device is integrated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011069143.XA CN112227275A (en) | 2020-09-30 | 2020-09-30 | Replaceable foam concrete filled honeycomb pier anti-explosion device and mounting method thereof |
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| CN202011069143.XA CN112227275A (en) | 2020-09-30 | 2020-09-30 | Replaceable foam concrete filled honeycomb pier anti-explosion device and mounting method thereof |
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| CN115492263A (en) * | 2022-09-28 | 2022-12-20 | 北京工业大学 | Multi-disaster-resistant replaceable protection construction device and installation method thereof |
| CN117211435A (en) * | 2023-09-28 | 2023-12-12 | 北京工业大学 | Multi-disaster toughness protection structure |
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Application publication date: 20210115 |