CN110872807A - Construction method of steel temporary bridge and steel temporary bridge - Google Patents
Construction method of steel temporary bridge and steel temporary bridge Download PDFInfo
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- CN110872807A CN110872807A CN201811024711.7A CN201811024711A CN110872807A CN 110872807 A CN110872807 A CN 110872807A CN 201811024711 A CN201811024711 A CN 201811024711A CN 110872807 A CN110872807 A CN 110872807A
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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
- E01D15/00—Movable or portable bridges; Floating bridges
- E01D15/12—Portable or sectional bridges
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a construction method of a steel temporary bridge and the steel temporary bridge, and relates to the technical field of engineering. One embodiment of the method comprises: pre-burying a top crown beam of a bored pile, and pre-burying bolts for fixing an end frame of a military beam at the upper part of the top crown beam of the bored pile; after confirming that the earthwork in the foundation pit is excavated to the bottom surface elevation of the military beam, erecting according to the axis of each standard triangle of the military beam; installing a whole military beam based on the set frame and the pre-embedded top crown beam of the bored pile, and pouring; wherein the whole military beam consists of more than one standard triangle and two end frameworks; and paving a pavement system on the upper edge of the upper chord of the whole military beam. The method reduces personnel investment and equipment investment, and has the advantages of low cost, short construction period and remarkable economic benefit.
Description
Technical Field
The invention relates to the technical field of engineering, in particular to a construction method of a steel temporary bridge and the steel temporary bridge.
Background
The steel temporary bridge is a trestle bridge which is generally designed to solve the problem of temporary traffic so as to facilitate the traffic of vehicles and pedestrians. In the prior art, a structure that a Bailey sheet and a main beam are connected into a whole is mostly adopted. However, in practice, the prior art has been found to have the following problems: because most steel temporary bridges are temporarily designed and built, the prior art cannot meet the requirements of quick transportation, splicing and quick evacuation of the steel temporary bridges; moreover, it is very inconvenient to transport the steel temporary bridge to the working site.
Disclosure of Invention
In view of this, the embodiment of the invention provides a construction method of a steel temporary bridge and the steel temporary bridge, which can reduce the investment of personnel and equipment and have the advantages of low cost, short construction period and remarkable economic benefit.
To achieve the above object, according to an aspect of an embodiment of the present invention, there is provided a construction method of a steel temporary bridge.
The construction method of the steel temporary bridge comprises the following steps: pre-burying a top crown beam of a bored pile, and pre-burying bolts for fixing an end frame of a military beam at the upper part of the top crown beam of the bored pile; after confirming that the earthwork in the foundation pit is excavated to the bottom surface elevation of the military beam, erecting according to the axis of each standard triangle of the military beam; installing a whole military beam based on the set frame and the pre-embedded top crown beam of the bored pile, and pouring; wherein the whole military beam consists of more than one standard triangle and two end frameworks; and paving a pavement system on the upper edge of the upper chord of the whole military beam.
Optionally, the step of laying a pavement system on the upper edges of the upper chords of the integral military beams comprises: sequentially laying a wood plate, a rubber plate and a steel plate, wherein the steel plate is a welded whole; and laying a welded antiskid plate on the steel plate.
Optionally, before installing the whole military beam, the method further comprises: laying 10 × 10cm square timbers at military beam assembly nodes in a flat field, wherein the space between the square timbers is consistent with that between the military beam assembly nodes; placing two square timbers at each node side by side, and leveling by using a leveling instrument; adjusting the end frame and the standard triangle to be assembled on the square timber through a crane, aligning the pin holes one by one, and installing steel pin fixing hole positions after the hole positions are aligned; assembling an end framework, a standard triangle and an installation end chord member; assembling a standard triangle and installing a horizontal chord.
Optionally, based on the erected and pre-buried bored pile top crown beam, the step of installing the whole military beam includes: cleaning up the floating slag and sundries on the surface of the constructed crown beam, and removing the protective plastic paper on the pre-embedded bolt; excavating the earthwork in the foundation pit to the bottom surface elevation of the military beam; measuring the longitudinal and transverse axes of a standard triangle of each military beam by using a total station or a theodolite, and measuring the elevation by using a level gauge; after the strength of the crown beam and the temporary strip foundation concrete reaches a preset value, lofting the axial mileage of each military beam on the crown beam and the temporary strip foundation, and accurately erecting according to the paying-off axial; a fixed steel plate to which the end frame is mounted; and after the military beam is longitudinally installed for a preset length, installing the connection system channel steel and the cross connection sleeve bolt at the lower part of the whole military beam.
Optionally, the bored pile top crown beam is L-shaped.
Optionally, the military beam is a single layer of sixty-four military beam, and the end frame is a 2m end frame.
Optionally, after paving the pavement system on the upper edge of the upper chord of the military beam of the whole piece, the method further comprises the following steps: laying monitoring points for monitoring, and mounting a surface strain gauge at the monitoring points; based on the initial data of the surface strain gauge and the read real-time data, a strain value P:
P＝K(Fi－F0)+b(Ti－T0)
wherein, P is a strain value, a positive value represents tension, and a negative value represents compression; k is a calibration coefficient; f0Is the initial frequency modulus; fiIs a read time frequency modulus; b is a temperature correction value; t is0Is at room temperature; t isiThe temperature of the reading is measured.
Optionally, the monitoring points include a settlement monitoring point and an internal force monitoring point.
To achieve the above objects, according to one aspect of an embodiment of the present invention, there is provided a steel temporary bridge.
The construction method of the steel temporary bridge comprises the following steps: two ends of the military beam are end frameworks, and more than one standard triangle is sequentially connected between the end frameworks at the two ends; the military beam is fixed through end frames at two ends of the military beam and the cast-in-place bored pile top crown beam; be provided with the road surface system on the last chord member of for military use roof beam, the road surface system has laid plank, rubber slab and steel sheet by supreme down in proper order, wherein, set up 5 internal force monitoring points on the for military use roof beam, set up respectively on montant and the lower chord member in for military use roof beam's the perpendicular depression bar of for military use roof beam, last chord member, oblique web member, the enhancement triangle.
Optionally, drilling bored concrete pile top crown beam is the L type, the pre-buried bolt that is used for the end framework of fixed military beam in drilling bored concrete pile top crown beam's upper portion, the military beam is the military beam of six four formulas of individual layer formula, and the end framework is 2m end framework.
One embodiment of the above invention has the following advantages or benefits: the military beam is used as a main component bearing the load of vehicles on the road surface, and has the characteristics of light structure, quick assembly, strong adaptability and the like. Furthermore, the embodiment of the invention solves the problem that the requirements of quick transportation, splicing and quick evacuation of the steel temporary bridge cannot be met in the prior art. Moreover, the steel temporary bridge is convenient to transport to the operation site. Meanwhile, the construction process is convenient, the investment of personnel and equipment is reduced, and the method has the advantages of low cost, short construction period and remarkable economic benefit.
Further effects of the above-mentioned non-conventional alternatives will be described below in connection with the embodiments.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic view of a main flow of a construction method of a steel access bridge according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a military beam according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of an internal force monitoring point according to an embodiment of the present invention;
FIG. 4 is a schematic view of an L-shaped crown beam according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a steel access bridge according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a standard triangle according to an embodiment of the present invention;
in the figure, the position of the upper end of the main shaft,
1-end framework; 2-standard triangle; 3-cross sleeve bolt; 4-an end frame linkage system; 5-end chord; 6-diagonal web member connecting system; 7-lower chord connecting system; 8-standard chord member; 9-cross sleeve bolt; 10-end chord; 11a, 11b, 11c, 11d, 11 e-surface strain gauges; 12-a pavement system; 13-drilling and pouring a pile top crown beam; 14-standard section rectangular crown beam.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which various details of embodiments of the invention are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Fig. 1 is a schematic diagram of a main flow of a construction method of a steel access bridge according to an embodiment of the present invention, and as shown in fig. 1, the construction method of the steel access bridge according to the embodiment of the present invention mainly includes:
the method comprises the following steps that S101, a cast-in-place bored pile top crown beam is pre-buried, bolts used for fixing an end frame of a military beam are pre-buried at the upper portion of the cast-in-place bored pile top crown beam, the military beam is a single-layer six-four military beam, the end frame is a 2m end frame, the military beam is a full-welded frame, a pin joint assembly, a single-layer or double-layer multi-piece type detachable upper steel bearing truss beam of an open bridge deck system, the embodiment of the invention adopts a single-layer structure, the reinforced single-layer six-four military beam (formed by combining a reinforced tripod and an auxiliary end frame) is selected, the main truss of the six-four railway military beam (code: 102-1) comprises six basic components such as a standard triangle (code ①), an end frame (code ②), a standard chord (code ③), an end rod (code ④), an oblique chord (code ⑤) and a strut (code ⑥) and two node connection partners such as a steel pin, a strut bolt, and the like, and can be assembled to meet the national standard (GB 65) and the six standard span change according to the military beam and the six standard of the military beam or the reinforced truss (code of the military beam) and the reinforced railway and the reinforced truss, and the reinforced truss girder (code of the reinforced truss) of the reinforced truss, and the reinforced truss girder can be respectively used for replacing the six basic components of the military beam with the.
Fig. 2 is a schematic structural diagram of a military beam according to an embodiment of the present invention, and as shown in fig. 2, the military beam according to an embodiment of the present invention mainly includes: the structure comprises an end framework 1, a standard triangle 2, a cross sleeve bolt 3, an end framework connecting system 4, an end chord 5, a diagonal web member connecting system 6, a lower chord connecting system 7, a standard chord 8, a cross sleeve bolt 9 and an end chord 10. Military beam fittings are common, and there are eleven types. The method is divided into four categories according to the application: the member connecting pin comprises a steel pin and a stay bar pin; the connecting system fittings comprise four types of transverse sleeve bolts, connecting system channel steel, a No. two U-shaped bolt and a No. three U-shaped bolt; the bridge deck system accessories comprise four types of panels, a first U-shaped bolt, a pressing plate and a pressing plate bolt; for the supports, each set of support comprises a pre-embedded positioning bolt, a positioning steel pressure plate and a connecting bolt; the steel pin is used for connecting the upper main chord member and the lower main chord member, the cross sleeve bolt is mainly used for connecting the chords among the main trusses, and the connecting system channel steel is mainly a plane and section connecting rod piece. The first U-shaped bolt is connected with the panel and the upper chord of the main truss, and the second U-shaped bolt is connected with the connecting system channel steel, the lower chord of the main truss and the brace rod. The U-shaped bolt is connected with the connecting system channel steel and the web member (including the stay bar).
The assembly of military beam is gone on in stacking the place, and earlier the place is leveled, packs up at military beam assembly node and puts 10 x 10cm square timber, and the square timber interval is unanimous with each node interval of military beam, and two square timbers are placed side by side to every node to level with the spirit level, guarantee that the square timber elevation is unanimous, the deviation control is within 3 mm. And adjusting the 2 m-end framework and the two standard triangles to be assembled on the square timber through a crane, aligning the two standard triangles one by one through the pin holes, and installing steel pin fixing hole positions after the hole positions are aligned. And firstly, mounting an end framework and a standard triangle, then mounting an end chord member, then mounting the standard triangle, finally mounting a horizontal chord member, and completing the assembly of the single military beam. The axis and the level of the military beam assembled into pieces are rechecked, after the assembling error meets the standard requirement, the military beam can be transported to the site to be specifically installed, 10-by-10 cm square timbers are padded at the assembling nodes of the military beam in a flat site, and the spacing between the square timbers is consistent with that between the assembling nodes of the military beam. Then, two square timbers are placed side by side at each node, and leveling is performed by a leveling instrument. And adjusting the end frame and the standard triangle to be assembled on the square timber through a crane, aligning the pin holes one by one, and installing steel pin fixing hole positions after the hole positions are aligned. Assembling end frameworks and standard triangles and installing end chords. And assembling the standard triangle and installing the horizontal chord. And (4) analyzing according to a plane structure by combining the six-four beam structure, and calculating the single-layer six-four beam plane structure by adopting a PKPM software steel structure module. In the embodiment of the invention, if the six-four beam dead weight system automatically calculates, the dead weight of the bridge deck system is 1.0KN/m according to half of the load, the freight train load is 7 six-four beam width according to the passing width of one freight train, the plane model load is 1000/14-71 KN, the load is applied to three nodes of the midspan six-four beam unit, and each node is 28KN in consideration of a certain safety factor.
Fig. 4 is a schematic view of an L-shaped crown beam according to an embodiment of the present invention, and as shown in fig. 4, the bored pile top crown beam is L-shaped. The reinforced concrete continuous beam is arranged at the top of a foundation pit peripheral support (enclosure) structure (mostly piles and walls), and is used for connecting all pile foundations together (such as a bored pile, a rotary excavating pile and the like) to prevent collapse of the top edge of a foundation pit (vertical shaft), bearing horizontal extrusion force and vertical shear force of a steel support (or a reinforced concrete support) through a bracket and chiseling laitance and the like during construction of a crown beam.
Step S102: and after confirming that the earthwork in the foundation pit is excavated to the bottom surface elevation of the military beam, erecting according to the axis of each standard triangle of the military beam.
Step S103: and installing the whole military beam based on the erected and pre-embedded top crown beam of the bored cast-in-place pile, and performing casting. Wherein, the whole military beam consists of more than one standard triangle and two end frameworks. Specifically, floating slag and sundries on the surface of a constructed crown beam are cleaned, and protective plastic paper on pre-embedded bolts is removed; excavating the earthwork in the foundation pit to the bottom surface elevation of the military beam; measuring the longitudinal and transverse axes of a standard triangle of each military beam by using a total station or a theodolite, and measuring the elevation by using a level gauge; after the strength of the crown beam and the temporary strip foundation concrete reaches a preset value, lofting the axial mileage of each military beam on the crown beam and the temporary strip foundation, and accurately erecting according to the paying-off axial; a fixed steel plate for mounting the end frame; after the military beam is longitudinally installed for a preset length, the connection system channel steel and the cross connection sleeve bolt at the lower part of the whole military beam are installed.
The military beam installation process mainly comprises the steps of on-site cleaning, measurement paying-off and installation, wherein during the on-site cleaning, floating slag and sundries on the surface of the constructed crown beam are cleaned, and protective plastic paper on the embedded bolts is removed, so that the military beam is installed conveniently. And excavating the earthwork in the foundation pit to the elevation of the bottom surface of the military beam. In the measurement paying-off process, a total station or a theodolite is adopted by a measurement group to measure the longitudinal axis and the transverse axis of each military beam, and a level is adopted to measure the elevation. In the installation process of the embodiment of the invention, after the strength of the crown beam and the temporary bar foundation reaches 85%, the axial mileage of each military beam is set out on the crown beam and the temporary bar foundation, and the erection is accurately carried out according to the paying-off axial. And a fixed steel plate of the end framework is installed to fix the position of the whole military beam. The connection system channel steel and the cross sleeve bolt at the lower part of the military beam are installed after being longitudinally installed for a certain length. Then, casting the strip concrete. In the process, the concrete of the post-cast strip of the crown beam is poured before the cover plate is installed. And after the concrete pouring is finished, backfilling earth on the upper part to the space between the military beams, and maintaining.
Step S104: and paving a pavement system on the upper edge of the upper chord of the whole military beam. Specifically, a wood plate, a rubber plate and a steel plate are sequentially laid, wherein the steel plate is a welded whole; and laying a welded antiskid plate on the steel plate. The two ends of the pavement system are placed on the upper edges of the upper chords of the military beams, the elevation of the plates is consistent when the pavement slab is paved, the splicing is tight and flush, and the phenomenon of dislocation cannot occur. In the embodiment of the invention, in the process of laying a pavement system on the upper part of a military beam, a wood board with the thickness of 5cm is fully laid, a rubber board with the thickness of 10mm is laid, a steel board with the thickness of 20mm is fully laid and welded into a whole, a pattern steel board with the thickness of 0.4mm is laid on the steel board, and the steel boards are reliably welded to form a whole.
After paving the pavement system on the upper edge of the upper chord of the military beam of the whole piece, the method further comprises the following steps: laying monitoring points for monitoring, and installing surface strain gauges at the monitoring points. And the monitoring points comprise a settlement monitoring point and an internal force monitoring point. Based on the initial data of the surface strain gauge and the read real-time data, the strain value P:
P＝K(Fi－F0)+b(Ti－T0)
wherein, P is a strain value, a positive value represents tension, and a negative value represents compression; k is a calibration coefficient; f0Is the initial frequency modulus; fiIs a read time frequency modulus; b is a temperature correction value; t is0Is at room temperature; t isiThe temperature of the reading is measured.
For military use roof beam is the main component that bears road surface vehicle load, for the stability of guaranteeing the normal passing through of vehicle and foundation ditch, guarantees the normal construction of major structure, specially monitors for military use roof beam, verifies structural design, provides feedback information for structural design and construction scheme's revision. The monitoring content mainly comprises military beam settlement monitoring and internal force monitoring, and the required detecting instrument mainly comprises: precision level gauges, invar gauges, and model EBJ-57 surface strain gauges, vibrating wire frequency receivers.
For settlement monitoring, settlement observation points can be arranged along the base ends of the temporary bars of the military beams, the settlement condition of the military beams under the action of vehicle load is observed, and meanwhile, the settlement condition of the temporary bar bases is mastered.
FIG. 3 is a schematic diagram of an internal force monitoring point according to an embodiment of the invention. And (4) selecting two monitoring sections for internal force monitoring, namely selecting two military beams for internal force monitoring. According to the stress characteristic of the military beam structure, a single military beam is considered as a truss structure. In the embodiment of the invention, 5 internal force monitoring points are arranged on each beam and are respectively arranged on an upper chord member, a lower chord member, a middle vertical member of a reinforcing triangle, a vertical compression bar and an inclined web member of a military beam. As shown in fig. 3, surface strain gauges 11a, 11b, 11c, 11d, 11e are attached to 5 internal force monitoring points, i.e., the surface strain gauges 11a, 11b, 11c, 11d, 11e are provided on the vertical bar, the upper chord, the diagonal web member, the reinforcing triangle center vertical bar, and the lower chord, respectively.
When the surface strain gauge is installed, a standard core rod is sleeved when ① is installed, the outer side faces of two ends of the standard core rod are flush with the outer side faces of the installation frame, then two M10 screws are screwed by a spanner, ② the installation frame with the standard core rod installed is adhered to the steel support surface by a high-strength special adhesive, when the installation frame is adhered, firstly, a military beam base surface is derusted and cleaned, the strain gauge is parallel to a support axis, and is preferably overlapped, ③ two M10 screws are loosened, the standard core rod is taken out from one end of the installation frame, the standard core rod is installed into the other installation frame, the next installation is continued, ④ after the installation frame is firmly adhered to the steel support, the formal installation of the strain gauge is carried out, when the installation is carried out, the strain gauge is slowly pushed into the installation frame from one end, after the standard core rod is in place, the.
When the strain gauge is pushed into the mounting frame, the strain gauge is strictly prohibited from bending and deforming and needs to be pushed into the mounting frame stably; strictly forbidding to make the strain gauge torsionally deformed, pushing in the strain gauge in a free state; the strain gauges are required to be flush with the outer side faces of the two ends of the mounting frame after the strain gauges are in place. When the M10 screw is tightened, a frequency reading instrument is connected, and a primary frequency value (f1) is measured before tightening; the frequency value of the strain gauge must be observed when the M10 screw is tightened (f2), the frequency should be controlled within f2 ═ f1 ± 100Hz, the two screws should be screwed in correspondingly slowly until they are tightened, and the tightening of one and then the other is strictly prohibited.
For the embodiment of the invention, the military beam is used as a main component bearing the load of vehicles on the road surface, and the military beam has the characteristics of light structure, quick assembly, strong adaptability and the like. Furthermore, the embodiment of the invention solves the problem that the requirements of quick transportation, splicing and quick evacuation of the steel temporary bridge cannot be met in the prior art. Moreover, the steel temporary bridge is convenient to transport to the operation site. Meanwhile, the construction process is convenient, the investment of personnel and equipment is reduced, and the method has the advantages of low cost, short construction period and remarkable economic benefit.
FIG. 5 is a schematic structural view of a steel girder bridge according to an embodiment of the present invention, FIG. 6 is a schematic view of a standard triangle according to an embodiment of the present invention, as shown in FIGS. 5 and 6, the steel girder bridge according to an embodiment of the present invention mainly includes bored cast-in-place pile top crown beams 13, military beams and a road surface system 12, end frames 1 are provided at both ends of the military beams, and more than one standard triangle 2 is sequentially connected between the end frames 1 at both ends, and the military beams are fixed by the end frames 1 and the bored cast-in-place pile top crown beams 13 at both ends thereof, a standard section rectangular crown beam 14 is buried under the bored cast-in-place pile top crown beams 13, a road surface system 12 is provided on an upper chord of the military beams, and the system of the steel girder bridge according to an embodiment of the present invention mainly consists of bored cast-in-place pile top crown beams, reinforced six-four-way railway military beams, a reinforced six-way military beams (abbreviated as military beams) as main load bearing members for road vehicles, which have structural features of structural, light weight, quick speed, adjustable, as shown in FIG. 5, and other structural members including six steel members, four steel bar reinforced steel bar members, steel bar reinforced steel bar, steel bar reinforced steel bar, steel bar reinforced steel bar, reinforced steel bar, reinforced steel bar, reinforced steel bar:
the embodiment of the invention provides a steel temporary bridge, which mainly comprises the following components as shown in figures 2-6: a cast-in-place bored pile top crown beam 13, a military beam and a pavement system 12; two ends of the military beam are provided with end frameworks 1, and more than one standard triangle 2 is sequentially connected between the end frameworks 1 at the two ends; and the military beam is fixed through the end frame 1 and the cast-in-situ bored pile top crown beam 13 at the two ends of the military beam. And a standard section rectangular crown beam 14 is buried below the bored pile top crown beam 13. A pavement system 12 is arranged on the upper chord of the military beam, and a wood plate, a rubber plate and a steel plate are sequentially paved on the pavement system 12 from bottom to top. The military beam is a single-layer six-four military beam, and the end framework 1 is a 2m end framework. The top beam 13 of the bored pile is in an L shape, so that the stability of the structure is improved. And bolts for fixing the end frame of the military beam are embedded at the upper part of the top crown beam 13 of the bored pile. And a welded antiskid plate is laid on the steel plate. The thickness of the wood board, the rubber board and the steel board is respectively 50mm, 10mm and 20mm, and the thickness of the antiskid plate is 4 mm. Internal force monitoring points 11a, 11b, 11c, 11d and 11e are respectively arranged on the vertical compression bar, the upper chord, the inclined web member, the middle vertical bar of the reinforcing triangle and the lower chord of the military beam.
The steel temporary bridge provided by the embodiment of the invention has the advantages of light structure, quick assembly and strong adaptability, can reduce personnel investment and equipment investment in the construction process, and has the advantages of low cost, short construction period and remarkable economic benefit.
The above-described embodiments should not be construed as limiting the scope of the invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A construction method of a steel temporary bridge is characterized by comprising the following steps:
pre-burying a top crown beam of a bored pile, and pre-burying bolts for fixing an end frame of a military beam at the upper part of the top crown beam of the bored pile;
after confirming that the earthwork in the foundation pit is excavated to the bottom surface elevation of the military beam, erecting according to the axis of each standard triangle of the military beam;
installing a whole military beam based on the set frame and the pre-embedded top crown beam of the bored pile, and pouring; wherein the whole military beam consists of more than one standard triangle and two end frameworks;
and paving a pavement system on the upper edge of the upper chord of the whole military beam.
2. The method of claim 1, wherein the step of laying a pavement system on the upper edges of the upper chords of the monolithic military beams comprises:
sequentially laying a wood plate, a rubber plate and a steel plate, wherein the steel plate is a welded whole;
and laying a welded antiskid plate on the steel plate.
3. The method of claim 1, further comprising, prior to installing the integral piece of military beam:
laying 10 × 10cm square timbers at military beam assembly nodes in a flat field, wherein the space between the square timbers is consistent with that between the military beam assembly nodes;
placing two square timbers at each node side by side, and leveling by using a leveling instrument;
adjusting the end frame and the standard triangle to be assembled on the square timber through a crane, aligning the pin holes one by one, and installing steel pin fixing hole positions after the hole positions are aligned;
assembling an end framework, a standard triangle and an installation end chord member;
assembling a standard triangle and installing a horizontal chord.
4. The method of claim 1, wherein the step of installing a monolithic military beam based on the erected and pre-embedded bored pile top crown beam comprises:
cleaning up the floating slag and sundries on the surface of the constructed crown beam, and removing the protective plastic paper on the pre-embedded bolt;
excavating the earthwork in the foundation pit to the bottom surface elevation of the military beam;
measuring the longitudinal and transverse axes of a standard triangle of each military beam by using a total station or a theodolite, and measuring the elevation by using a level gauge;
after the strength of the crown beam and the temporary strip foundation concrete reaches a preset value, lofting the axial mileage of each military beam on the crown beam and the temporary strip foundation, and accurately erecting according to the paying-off axial;
a fixed steel plate to which the end frame is mounted;
and after the military beam is longitudinally installed for a preset length, installing the connection system channel steel and the cross connection sleeve bolt at the lower part of the whole military beam.
5. The method according to claim 1, wherein the bored pile top crown beam is L-shaped.
6. The method of claim 1, wherein the military beam is a single layer sextutre military beam and the end frame is a 2m end frame.
7. The method of claim 1, further comprising, after laying a pavement system on the upper edges of the upper chords of the monolithic military beams:
laying monitoring points for monitoring, and mounting a surface strain gauge at the monitoring points;
based on the initial data of the surface strain gauge and the read real-time data, a strain value P:
P＝K(Fi－F0)+b(Ti－T0)
wherein, P is a strain value, a positive value represents tension, and a negative value represents compression; k is a calibration coefficient; f0Is the initial frequency modulus; fiIs a read time frequency modulus; b is a temperature correction value; t is0Is at room temperature; t isiThe temperature of the reading is measured.
8. The method of claim 7, wherein the monitoring points comprise a settlement monitoring point and an internal force monitoring point.
9. A steel temporary bridge is characterized by comprising a bored cast-in-place pile top crown beam, a military beam and a pavement system;
two ends of the military beam are end frameworks, and more than one standard triangle is sequentially connected between the end frameworks at the two ends; the military beam is fixed through end frames at two ends of the military beam and the cast-in-place bored pile top crown beam;
a pavement system is arranged on the upper chord of the military beam, a wood plate, a rubber plate and a steel plate are sequentially paved on the pavement system from bottom to top,
wherein, set up 5 internal force monitoring points on the for military use roof beam, set up respectively on montant and lower chord in the vertical depression bar, last chord member, oblique web member, the reinforcing triangle of for military use roof beam.
10. The steel temporary bridge according to claim 9, wherein the bored pile top crown beam is L-shaped, the upper portion of the bored pile top crown beam is embedded with bolts for fixing an end frame of a military beam, the military beam is a single-layer type sixty-four type military beam, and the end frame is a 2m end frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811024711.7A CN110872807A (en) | 2018-09-04 | 2018-09-04 | Construction method of steel temporary bridge and steel temporary bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811024711.7A CN110872807A (en) | 2018-09-04 | 2018-09-04 | Construction method of steel temporary bridge and steel temporary bridge |
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| CN110872807A true CN110872807A (en) | 2020-03-10 |
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| CN112779850A (en) * | 2020-12-31 | 2021-05-11 | 浙大城市学院 | Granular material cargo transporting trestle platform for river-crossing tunnel navigation sealing cofferdam construction and construction method |
| RU2769236C1 (en) * | 2021-04-22 | 2022-03-29 | Валерий Александрович Комаров | Dancing bridge |
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