CN116289491A - String beam formula foundation ditch steel landing stage - Google Patents
String beam formula foundation ditch steel landing stage Download PDFInfo
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- CN116289491A CN116289491A CN202310123825.1A CN202310123825A CN116289491A CN 116289491 A CN116289491 A CN 116289491A CN 202310123825 A CN202310123825 A CN 202310123825A CN 116289491 A CN116289491 A CN 116289491A
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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
- E01D15/133—Portable or sectional bridges built-up from readily separable standardised sections or elements, e.g. Bailey 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/005—Piers, trestles, bearings, expansion joints or parapets specially adapted for 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
- E01D6/00—Truss-type bridges
- E01D6/02—Truss-type bridges of bowstring type
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention relates to a string beam type foundation pit steel trestle bridge, which comprises a column support system, a string beam system and a bridge deck system, wherein the column support system comprises a column, a column pile and a support connecting piece, the column is provided with a column support mechanism, the column support mechanism comprises a horizontal support and a scissor support, the string beam system comprises an upper string pressure bar, a steel web member, a steel pull rod, a connecting pin and an anchor box, the upper string pressure bar is provided with an overhanging end plate, the bridge deck system comprises a spandrel beam, a distribution beam, a bridge deck plate and a protection railing, the spandrel beam is provided with a b end plate, the spandrel beam is assembled on the upper string pressure bar, the distribution beam is assembled on the spandrel beam, the bridge deck plate is assembled on the distribution beam, and the bridge deck plate is welded and paved with a pattern anti-skid steel plate; the steel tension rod in the beam string is prestressed, so that the main stress member of the steel trestle becomes a bending member, and the steel trestle has the characteristics of high bearing capacity, small deformation and strong structural stability.
Description
Technical Field
The invention belongs to the technical field of foundation pit trestle, and particularly relates to a beam-string foundation pit steel trestle.
Background
The foundation pit trestle is a temporary structure which is formed by beams, plates, upright posts, connecting rods and the like in foundation pit engineering and is used as a transportation channel or an operation platform, the foundation pit trestle can be divided into reinforced concrete trestle, steel trestle, combined trestle and the like according to materials, and can be divided into horizontal trestle, slope trestle and the like according to vertical arrangement.
Disclosure of Invention
The purpose of the invention is that: aims to provide a beam-string foundation pit steel trestle for solving the problems existing in the background technology.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a beam-string foundation pit steel trestle comprises an upright post supporting system, a beam-string system and a bridge deck system;
the upright post supporting system comprises an upright post, an upright post pile and a support connecting piece, wherein the upright post is inserted into the inner side of the upright post pile, the upright post pile is provided with a foundation slab, the upright post is positioned at the foundation slab and is provided with a water stop steel plate, the support connecting piece is arranged at the upper end of the upright post, an inter-column supporting mechanism is arranged in a transverse plane of the upright post and comprises a horizontal support and a scissor support, end plates are fixedly arranged at the ends of the horizontal support and the scissor support, and the horizontal support and the scissor support are fixedly connected with the rectangular lacing plate through bolts;
the string beam system comprises an upper string pressure rod, steel web members, steel tie rods, connecting pins and anchor boxes, wherein the two ends of each upper string pressure rod are fixedly provided with overhanging end plates, two overhanging end plates between adjacent upper string pressure rods are fixedly connected through bolts, the upper string pressure rod at the end part is fixedly connected with the anchor boxes through the overhanging end plates, the lower flange of each upper string pressure rod is fixedly connected with each steel web member through bolts, the steel tie rods are sequentially connected end to end, the connecting pins are arranged between the lower ends of the steel web members and the adjacent steel tie rods, the steel tie rods at the end parts at the two sides are respectively assembled and connected with the anchor boxes at the two sides, and the anchor boxes at the outermost side are fixedly provided with end supports;
bridge deck system includes spandrel girder, distribution roof beam, decking and protection railing, spandrel girder both ends are fixed to be equipped with b head board, spandrel girder fixed assembly in go up the string depression bar, a plurality of distribution Liang Junyun assemble in spandrel girder upper end, the decking assemble in a plurality of distribution roof beam upper end, the welding of decking upper end has laid decorative pattern antiskid steel sheet, circular wash port has been seted up to decorative pattern antiskid steel sheet, protection railing assemble in distribution roof beam upside.
Preferably, the upright post is a lattice post, the upright post comprises four angle steels and four rectangular lacing plates, and the four angle steels and the four rectangular lacing plates are welded at equal intervals to form a square post.
Preferably, the support connecting piece comprises a square pressure-bearing steel plate, two rectangular connecting plates and an a pin shaft, two bracket plates are fixedly arranged between the square pressure-bearing steel plate and four angle steels, the two rectangular connecting plates are welded at the upper ends of the square pressure-bearing steel plate, round holes are formed in the middle parts of the two rectangular connecting plates, and the a pin shaft is assembled in the round holes.
Preferably, the steel web member lower extreme is fixed and is equipped with the connecting rod, steel web member upper end is fixed and is equipped with the parallel and level end plate, the parallel and level end plate with the lower flange of last chord depression bar passes through bolted connection, the connecting rod upper end is fixed and is equipped with two the parallel and level end plate, the connecting rod upper end the parallel and level end plate with steel web member passes through bolted connection, steel web member lower extreme is provided with an end socket plate, an end socket plate side is fixed and is equipped with two a otic placodes, steel pull rod both ends are fixed respectively and are equipped with U type connector and O type connector, adjacent the steel pull rod U type connector with O type connector and two be equipped with b round pin axle between the a otic placode.
Preferably, two steel pull rod ends in the outermost side are equipped with the ground tackle, two steel pull rod cover in the outermost side is equipped with steel sleeve, anchor case one side is fixed to be equipped with a connecting plate, a connecting plate with fixed being equipped with the stiffening plate between the anchor case, anchor case one side is fixed to be equipped with three b otic placode, and three b otic placode with a connecting plate is located respectively on two lateral surfaces that anchor case is parallel, adjacent be equipped with between the anchor case with a plurality of b otic placode assorted c round pin axle.
Preferably, the upper flange of the upper chord compression bar is fixedly provided with a first U-shaped fastener through a bolt, and the upper chord compression bar is fixedly connected with the spandrel girder through the first U-shaped fastener.
Preferably, the bridge deck plate both ends and middle part all are equipped with b connecting plate, the spandrel girder upper end is fixed to be equipped with the second U type fastener, the bridge deck plate spandrel girder with the distribution roof beam passes through b connecting plate and second U type fastener fixed connection, adjacent transverse connection and longitudinal connection between the bridge deck plate all pass through bolt fixed connection.
Preferably, the protection railing comprises a horizontal rod, a vertical rod, a foot blocking plate and a protection net, wherein the horizontal rod and the vertical rods are fixedly connected in a mutually vertical mode, the foot blocking plate and the protection net are assembled on the inner side of a frame formed between the horizontal rod and the vertical rods, a sleeve is arranged on one side of an upper flange of the distribution beam, and the sleeve is connected with the vertical rods in an inserting mode.
The steel trestle of the string beam type foundation pit can be designed into steel trestle with different spans by different arrangement of the steel web members and the steel pull rods and applying prestress to the steel pull rods, can be combined with different lengths according to the site conditions, and has the advantages of simple system, clear stress, high bearing capacity, small deformation, strong stability, large span, body cleaning tea therapy, quick assembly and recoverability.
Drawings
The invention may be further illustrated by means of non-limiting examples given in the accompanying drawings.
FIG. 1 is a schematic structural perspective view of a steel trestle of a beam-string foundation pit;
FIG. 2 is a top view of a steel trestle of a beam-string foundation pit;
FIG. 3 is a front view of the structure of a steel trestle of a beam-string foundation pit;
FIG. 4 is a side view of the structure of a beam-string foundation pit steel trestle of the present invention;
FIG. 5 is a schematic view of the structure of the column support system and the inter-column support mechanism of the present invention;
FIG. 6 is a schematic view of the structure of the anchor box and end support of the present invention;
FIG. 7 is a schematic diagram of a beam string system according to the present invention;
FIG. 8 is a schematic view of the structure of the upper chord strut of the present invention;
FIG. 9 is a schematic view of the structure of the steel web member and the steel tie rod of the present invention;
FIG. 10 is a schematic view of a steel tie rod according to the present invention;
FIG. 11 is a schematic view of an assembly of a steel web member and a steel tie rod of the present invention;
FIG. 12 is a schematic view of an assembly of a steel tie rod with an anchor box according to the present invention;
FIG. 13 is a schematic view of the assembly of the upper chord strut and the bolster in the present invention;
FIG. 14 is a schematic view of the assembly of the bolster and distribution beams of the present invention;
FIG. 15 is a schematic view of the bridge deck of the present invention;
FIG. 16 is a schematic view of the assembly of the deck and protective rail of the present invention;
the main reference numerals are as follows:
Detailed Description
In order that those skilled in the art will better understand the present invention, the following technical scheme of the present invention will be further described with reference to the accompanying drawings and examples.
Examples:
the invention discloses a beam-string foundation pit steel trestle, which comprises an upright post supporting system, a beam-string system and a bridge deck system;
as shown in fig. 4 and 5, the upright support system comprises an upright 11, an upright pile 12 and a support connecting piece 13, wherein the upright 11 is inserted into the inner side of the upright pile 12, the upright pile 12 is mainly used for bearing the load of a steel trestle transmitted by the upright 11, a bored pile is adopted to facilitate the insertion connection of the upright 11, the upright 11 is a lattice column, the upright 11 comprises four angle steels 111 and four rectangular batten plates 112, the four angle steels 111 and the four rectangular batten plates 112 are welded at equal intervals to form a square column, the upright pile 12 is provided with a foundation bottom plate 121, the upright 11 is provided with a water stop steel plate 113 at the foundation bottom plate 121, the support connecting piece 13 is arranged at the upper end of the upright 11, the support connecting piece 13 comprises a square steel plate 131, two rectangular connecting plates 133 and a pin 134, two bracket plates 132 are fixedly arranged between the square bearing steel plate 131 and the four angle steels 111, the two rectangular connecting plates 133 are welded at the upper ends of the square bearing steel plate 131, round holes are formed in the middle of the two rectangular connecting plates 133, and a pin 134 is assembled in the round holes;
as shown in fig. 5, a column-to-column supporting mechanism is arranged in a transverse plane of the upright 11, the column-to-column supporting mechanism comprises a horizontal support 15 and a scissor support 151, end plates 152 are fixedly arranged at the ends of the horizontal support 15 and the scissor support 151, the horizontal support 15 and the scissor support 151 are fixedly connected with a rectangular lacing plate 112 through bolts, the horizontal support 15 is an i-shaped steel, and the scissor support 151 is a channel steel, so that the stability of the upright 11 in the transverse plane is ensured;
7-12, the string girder system comprises an upper string compression bar 21, a steel web member 22, a steel pull rod 23, a connecting pin 24 and an anchor box 25, wherein the upper string compression bar 21, the steel web member 22, the steel pull rod 23, the connecting pin 24 and the anchor box 25 integrally form a fold line arch string girder system in a vertical plane, and the fold line arch string girder system is used for bearing vertical loads in the vertical plane, which are transmitted to the upper string compression bar 21 by a bridge deck system through a distribution beam 32 and a spandrel girder 31, and the two ends of a plurality of upper string compression bars 21 are fixedly provided with overhanging end plates 211, wherein when the bearing capacity of the upper string compression bar 21 is not satisfied by using single H-shaped steel, welding or bolting can be adopted to form double-spliced H-shaped steel as shown in FIG. 8; the upper chord compression bar 21 is used as a bending component for mainly bearing load of a string beam system, and is made of large-section narrow-flange HN steel, wherein in order to facilitate transportation and lifting installation, the two ends of the upper chord compression bar 21 are provided with overhanging end plates 211, the upper chord compression bar 21 is large-section H steel with the fixed length of 4, 5 and 6m, the two overhanging end plates 211 between the adjacent upper chord compression bars 21 are fixedly connected through bolts, and the connecting position of the overhanging end plates 211 should avoid the joints of the steel web members 22 and the spandrel beams 31; the upper chord compression bar 21 at the end part is fixedly connected with the anchor box 25 through an overhanging end plate 211, the lower flange of the upper chord compression bar 21 is fixedly connected with the steel web member 22 through bolts, the steel web member 22 is used as a lower chord compression member of a string tensioning beam system, the material of the lower chord compression member adopts middle flange HM section steel, a plurality of steel pull bars 23 are connected end to end in sequence, a connecting pin 24 is arranged between the lower end of the steel web member 22 and the adjacent steel pull bars 23, and the steel pull bars 23 at the two side end parts are respectively assembled and connected with the anchor boxes 25 at the two sides; wherein the vertical span ratio of the string beam system is 1/10-1/12;
as shown in fig. 6, the outermost anchor box 25 is fixedly provided with an end support 14, the end support 14 is fixedly arranged on a reinforced concrete crown beam at the top of a support pile 144, wherein the support pile 144 is a foundation support of a foundation pit, after the anchor box 25 is arranged on the end support 14, a reinforced concrete limiting plate 141 is poured on the concrete crown beam to limit the displacement of the anchor box 25, after the whole steel trestle is paved and the steel pull rods 23 at the two ends of the steel trestle are prestressed for the second time, sand and stones 142 are adopted at the gap of the end support 14 and at a construction slope place to carry out compaction backfill, and then a roadbed box 143 is paved, wherein the surface elevation of the roadbed box 143 is the same as the surface elevation of the bridge deck 33, so that the steel trestle is ensured to be consistent with the surface elevation of the site outside the foundation pit; the thickness of the limiting plate 141 made of reinforced concrete is preferably larger than 300mm, the reinforcing bars are not smaller than phi 20@100, the reinforcing bars are reserved after the concrete crown beam of the support column 144 is poured, and then the reinforced concrete limiting plate 141 is poured by standing a mould;
as shown in fig. 9-11, a connecting rod 26 is fixedly arranged at the lower end of a steel web member 22, the connecting rod 26 is made of small-section i-shaped steel, a flush end plate 221 is fixedly arranged at the upper end of the steel web member 22, the flush end plate 221 is connected with the lower flange of an upper chord compression rod 21 through bolts, two flush end plates 221 are fixedly arranged at the upper end of the connecting rod 26, the flush end plate 221 at the upper end of the connecting rod 26 is fixedly connected with the steel web member 22 through bolts, an a end plate 222 is arranged at the lower end of the steel web member 22, two a lug plates 223 are fixedly arranged at the side edges of the a end plate 222, a U-shaped connector 231 and an O-shaped connector 232 are fixedly arranged at the two ends of the steel web member 23 respectively, a pin shaft 241 is arranged between the U-shaped connector 231 and the O-shaped connector 232 of the adjacent steel web member 23 and the two a lug plates 223, the steel web member 23 is used as a lower chord tension member of a chord tension system and is composed of a round solid rod, the U-shaped connector 231 and the O-shaped connector 232, and is connected with the steel web member 22 through the b pin shaft 241 to form a folded lower chord tension member;
as shown in fig. 12, the end parts of the two outermost steel pull rods 23 are provided with anchors 233, and the two outermost steel pull rods 23 are sleeved with steel sleeves 234; the anchoring box 25 is a rectangular uncovered box body structure welded by steel plates with equal thickness, a round hole is formed in one side of a bottom plate of the rectangular uncovered box body structure for allowing the steel pull rod 23 at the end to pass through, a certain anchoring distance is reserved after the steel pull rod 23 at the end passes through the top of the anchoring box 25 at a certain angle so as to be convenient for installing an anchor 233, self-compacting concrete is poured after a concrete release agent is coated on the inner side of the anchoring box 25, and after the concrete reaches the design strength, the steel pull rod 23 at the end is subjected to prestress, and then is locked and anchored through the anchor 233; a connecting plate 251 is fixedly arranged on one side of the anchoring box 25, a stiffening plate 252 is fixedly arranged between the a connecting plate 251 and the anchoring box 25, three b lug plates 253 are fixedly arranged on one side of the anchoring box 25, the three b lug plates 253 and the a connecting plate 251 are respectively positioned on two parallel outer side surfaces of the anchoring box 25, c pin shafts 254 matched with the b lug plates 253 are arranged between the adjacent anchoring boxes 25, when the steel sleeve 234 is sleeved on the outermost steel pull rod 23 during installation, after penetrating through the anchoring box 25, self-compacting concrete is poured in the anchoring box 25, when prestress is applied to the steel pull rod 23, the steel pull rod 23 is tensioned and locked through an anchor 233, the prestress value applied to the steel pull rod 23 is matched with the prestress value calculated by an elastic fulcrum method, 60% -75% of the axial force design value of the steel pull rod 23 can be obtained, the prestress application process of the steel pull rod 23 is sequentially applied in multiple stages, and the prestress application axial force of each member is ensured to reach the design requirement through repeated adjustment;
as shown in fig. 13-14, the bridge deck system comprises a spandrel girder 31, a distribution girder 32, a bridge deck 33 and a guard rail 34, b end plates 311 are fixedly arranged at two ends of the spandrel girder 31, the spandrel girder 31 is fixedly assembled on an upper chord compression bar 21, the spandrel girder 31 is a transverse stress member for transmitting the steel trestle system to the upper chord compression bar 21, the transverse stress member is formed by double-splicing welding of small-section i-shaped steel, the upper flange of the upper chord compression bar 21 is fixedly provided with a first U-shaped fastener 312 through bolts, the upper chord compression bar 21 is fixedly connected with the spandrel girder 31 through the first U-shaped fastener 312, a plurality of distribution girders 32 are uniformly assembled at the upper end of the spandrel girder 31, the distribution girders 32 are used for transmitting the bridge deck 33 to the spandrel girder 31, the length of the spandrel girder 31 is the center distance of the spandrel girder 31, namely, the longitudinal connection of the spandrel girder 32 is on the center line of the spandrel girder 31, and the distribution girder 32 adopts small-section i-shaped steel;
15-16, the bridge deck 33 is assembled at the upper ends of a plurality of distribution beams 32, the bridge deck 33 is composed of I-shaped steel with small section and connecting steel, wherein the I-shaped steel is arranged at equal intervals, adjacent I-shaped steel is fixedly connected through welding of the connecting steel, a pattern anti-slip steel plate 331 is welded at the upper end of the bridge deck 33, a circular drain hole 332 is formed in the pattern anti-slip steel plate 331, a guard rail 34 is assembled at the upper side of the distribution beam 32, b connecting plates 333 are arranged at the two ends and the middle of the bridge deck 33, a second U-shaped fastener 322 is fixedly arranged at the upper end of the spandrel beam 31, the bridge deck 33, the spandrel beam 31 and the distribution beam 32 are fixedly connected through the b connecting plates 333 and the second U-shaped fastener 322, and the transverse connection and the longitudinal connection between the adjacent bridge deck 33 are fixedly connected through bolts; the guard rail 34 comprises a horizontal rod 341, an upright rod 342, a foot blocking plate 343 and a guard net 344, wherein a plurality of horizontal rods 341 and a plurality of upright rods 342 are mutually and vertically fixedly connected, the foot blocking plate 343 and the guard net 344 are assembled on the inner side of a frame formed between the horizontal rods 341 and the upright rods 342, a sleeve 321 is arranged on one side of the upper flange of the distribution beam 32, and the sleeve 321 is in plug connection with the upright rods 342;
the steel trestle is installed in construction:
(1) constructing a pile 12 while constructing the engineering pile, vertically inserting the pile 12 after welding a water stop steel plate 113 at the lower side of the column 11, wherein the insertion depth is required to meet the design requirement and is less than 3000mm from the foundation pit surface, then excavating the foundation pit to the depth of 144 crown beams of the supporting piles, constructing an end support 14 of reinforced concrete, and simultaneously welding a support connector 13 at the upper end of the column 11;
(2) the installation of the string girder system is to sequentially install the string girder system to the other end of the steel trestle according to the interval of the upright posts 11 from the end part of one side of the steel trestle, when the string girder system is installed, the string girder system is installed in parallel and symmetrically according to the center distance of the steel trestle, firstly, an anchor box 25 is installed on an end support 14, a side a connecting plate 251 of the anchor box 25 is connected with an overhanging end plate 211 of the end part of an upper string pressure rod 21 through bolts, and then an anchor box 25 on the other side of the upper string pressure rod 21 is installed on a support connecting piece 13 of the upright posts 11, so that the upper string pressure rod 21 is sequentially installed to the end support 14 on the other side of the steel trestle;
(3) the method comprises the steps of partially excavating earthwork between two parallel upper chord compression bars 21, wherein the earth excavation range and depth are required to meet the construction requirements of installing a steel web member 22, a steel pull rod 23 and a connecting rod 26, the steel web member 22 is fixedly installed on the lower flange of the upper chord compression bars 21 through a flush end plate 221 arranged at the upper end during installation through bolts, the lower end of the steel web member 22 is connected with U-shaped connectors 231 and O-shaped connectors 232 of the steel pull rods 23 at the two sides through a lug plate 223 by using a pin shaft 241, then the connecting rod 26 is fixedly installed on the upper side of the a head plate 222 at the lower end of the steel web member 22 through bolts, a steel sleeve 234 is sleeved on the steel pull rod 23 at the end part, the steel pull rod 23 at the end part penetrates into an anchor box 25, and then concrete release agent is smeared on the inner side of the anchor box 25, and self-compacting concrete is poured;
(4) installing a steel web member 22, a steel pull rod 23 and a connecting rod 26 between the upright posts 11 to the other end of the steel trestle according to the step (3);
(5) after the self-compacting concrete reaches the design strength, the steel pull rod 23 is pre-stressed for the first time according to 20% -40% of the final pre-stress, and the steel pull rod 23 is tensioned, locked and anchored through an anchorage device 233;
(6) the upper flange of the upper chord compression bar 21 is connected with the equal-interval spandrel girder 31 through two first U-shaped fasteners 312 which are arranged in parallel, the distribution girder 32 is connected with the standard components of the bridge deck 33 through a second U-shaped fastener 322 on the weighing girder 31, and the transverse direction and the longitudinal direction of the standard components of the bridge deck 33 are fixedly connected through bolts;
(7) the steel pull rods 23 at the two side ends of the steel trestle are subjected to second prestressing by 60% -75% of the final prestressing, and are tensioned, locked and anchored through the anchors 233;
(8) installing the guard rail 34, performing compaction backfilling on the gap of the end support 14 and the construction slope-releasing position by adopting sand stone 142, and then paving a roadbed box 143, wherein the surface elevation of the roadbed box 143 is the same as that of the bridge deck 33, so that the height of the steel trestle is consistent with that of a site outside a foundation pit;
(9) after the steel trestle is installed, continuously excavating earthwork to the elevation of the bottom of the foundation pit, and installing a horizontal support 15 and a scissor support 151 in the assembly support according to the excavation depth in the excavation process;
the steel trestle is used for monitoring the axial force of the steel pull rod and compensating according to the prestress loss condition;
the steel trestle is removed and recycled according to the following construction sequence:
the steel trestle is removed and recycled according to a construction sequence, and the steel trestle is removed from one side end of the steel trestle to the other end of the steel trestle according to the spacing between the upright posts;
1) Removing the foot blocking plate 343 and the dense-mesh protective net 344, removing the horizontal rods 341 and the vertical rods 342, and then sequentially removing the standard components of the bridge deck 33, the distribution beam 32 and the spandrel girder 31;
2) A support frame is erected between the upper chord compression bar 21 and the lower floor slab after construction by using standard steel pipes so as to ensure the stability of components in the sectional dismantling process of the upper chord compression bar 21;
3) After the prestress of the steel tie rod 23 at the end part is released, the connecting rod 26, the steel tie rod 23, the steel web member 22, the upper chord compression rod 21 and the anchoring box 25 are removed, and then the high-grade self-compaction concrete in the anchoring box 25 is removed;
4) The stand columns 11 between the floors are respectively cut off after the stand seat connecting pieces 13 of the stand columns 11 are cut off;
5) And finally, recovering the components of the bridge deck system and the string beam system.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims of this invention, which are within the skill of those skilled in the art, can be made without departing from the spirit and scope of the invention disclosed herein.
Claims (8)
1. A beam-string type foundation ditch steel trestle bridge, its characterized in that: comprises a column support system, a string beam system and a bridge deck system;
the upright post supporting system comprises an upright post, an upright post pile and a support connecting piece, wherein the upright post is inserted into the inner side of the upright post pile, the upright post pile is provided with a foundation slab, the upright post is positioned at the foundation slab and is provided with a water stop steel plate, the support connecting piece is arranged at the upper end of the upright post, an inter-column supporting mechanism is arranged in a transverse plane of the upright post and comprises a horizontal support and a scissor support, end plates are fixedly arranged at the ends of the horizontal support and the scissor support, and the horizontal support and the scissor support are fixedly connected with the rectangular lacing plate through bolts;
the string beam system comprises an upper string pressure rod, steel web members, steel tie rods, connecting pins and anchor boxes, wherein the two ends of each upper string pressure rod are fixedly provided with overhanging end plates, two overhanging end plates between adjacent upper string pressure rods are fixedly connected through bolts, the upper string pressure rod at the end part is fixedly connected with the anchor boxes through the overhanging end plates, the lower flange of each upper string pressure rod is fixedly connected with each steel web member through bolts, the steel tie rods are sequentially connected end to end, the connecting pins are arranged between the lower ends of the steel web members and the adjacent steel tie rods, the steel tie rods at the end parts at the two sides are respectively assembled and connected with the anchor boxes at the two sides, and the anchor boxes at the outermost side are fixedly provided with end supports;
bridge deck system includes spandrel girder, distribution roof beam, decking and protection railing, spandrel girder both ends are fixed to be equipped with b head board, spandrel girder fixed assembly in go up the string depression bar, a plurality of distribution Liang Junyun assemble in spandrel girder upper end, the decking assemble in a plurality of distribution roof beam upper end, the welding of decking upper end has laid decorative pattern antiskid steel sheet, circular wash port has been seted up to decorative pattern antiskid steel sheet, protection railing assemble in distribution roof beam upside.
2. The beam-string foundation pit steel trestle according to claim 1, characterized in that: the upright post is a lattice post, and comprises four angle steels and four rectangular lacing plates, wherein four angle steels and four rectangular lacing plates are welded at equal intervals to form a square post.
3. The beam-string foundation pit steel trestle according to claim 1, characterized in that: the support connecting piece comprises a square pressure-bearing steel plate, two rectangular connecting plates and an a pin shaft, two bracket plates are fixedly arranged between the square pressure-bearing steel plate and four angle steels, the two rectangular connecting plates are welded at the upper ends of the square pressure-bearing steel plate, round holes are formed in the middle parts of the two rectangular connecting plates, and the a pin shaft is assembled in the round holes.
4. The beam-string foundation pit steel trestle according to claim 1, characterized in that: the steel web member lower extreme is fixed and is equipped with the connecting rod, steel web member upper end is fixed and is equipped with the parallel and level end plate, the parallel and level end plate with the lower flange of last chord depression bar passes through bolted connection, the connecting rod upper end is fixed and is equipped with two the parallel and level end plate, the connecting rod upper end the parallel and level end plate with steel web member passes through bolted connection, steel web member lower extreme is provided with a head board, a head board side is fixed and is equipped with two a otic placodes, steel pull rod both ends are fixed respectively and are equipped with U type connector and O type connector, adjacent the steel pull rod U type connector and O type connector and two be equipped with b round pin axle between the a otic placode.
5. The beam-string foundation pit steel trestle according to claim 1, characterized in that: two of the outermost steel pull rod ends are provided with anchorage devices, two of the outermost steel pull rod sleeves are provided with steel sleeves, an a connecting plate is fixedly arranged on one side of the anchoring box, stiffening plates are fixedly arranged between the a connecting plate and the anchoring box, three b ear plates are fixedly arranged on one side of the anchoring box, the three b ear plates and the a connecting plate are respectively located on two outer side surfaces parallel to the anchoring box, and c pin shafts matched with a plurality of b ear plates are arranged between the adjacent anchoring boxes.
6. The beam-string foundation pit steel trestle according to claim 1, characterized in that: the upper flange of the upper chord compression bar is fixedly provided with a first U-shaped fastener through a bolt, and the upper chord compression bar is fixedly connected with the spandrel girder through the first U-shaped fastener.
7. The beam-string foundation pit steel trestle according to claim 1, characterized in that: the bridge deck slab is characterized in that b connecting plates are arranged at two ends and the middle of the bridge deck slab, a second U-shaped fastener is fixedly arranged at the upper end of the spandrel girder, the bridge deck slab, the spandrel girder and the distribution girder are fixedly connected through the b connecting plates and the second U-shaped fastener, and the adjacent bridge deck slabs are fixedly connected through bolts in a transverse connection and a longitudinal connection.
8. The beam-string foundation pit steel trestle according to claim 1, characterized in that: the protection railing comprises a horizontal rod, vertical rods, a foot blocking plate and a protection net, wherein the horizontal rods and the vertical rods are fixedly connected in a mutually perpendicular mode, the foot blocking plate and the protection net are assembled on the inner side of a frame formed between the horizontal rods and the vertical rods, a sleeve is arranged on one side of an upper flange of the distribution beam, and the sleeve is connected with the vertical rods in a plugging mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310123825.1A CN116289491A (en) | 2023-02-16 | 2023-02-16 | String beam formula foundation ditch steel landing stage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310123825.1A CN116289491A (en) | 2023-02-16 | 2023-02-16 | String beam formula foundation ditch steel landing stage |
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| Publication Number | Publication Date |
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| CN116289491A true CN116289491A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310123825.1A Pending CN116289491A (en) | 2023-02-16 | 2023-02-16 | String beam formula foundation ditch steel landing stage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118148157A (en) * | 2024-05-09 | 2024-06-07 | 上海巨鲲科技有限公司 | Foundation pit beam string structure and assembly method |
| CN118547568A (en) * | 2024-07-29 | 2024-08-27 | 上海巨鲲科技有限公司 | Beam string steel truss support and concrete trestle structure and construction method |
-
2023
- 2023-02-16 CN CN202310123825.1A patent/CN116289491A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118148157A (en) * | 2024-05-09 | 2024-06-07 | 上海巨鲲科技有限公司 | Foundation pit beam string structure and assembly method |
| CN118547568A (en) * | 2024-07-29 | 2024-08-27 | 上海巨鲲科技有限公司 | Beam string steel truss support and concrete trestle structure and construction method |
| CN118547568B (en) * | 2024-07-29 | 2024-11-19 | 上海巨鲲科技有限公司 | Truss support and concrete trestle structure for beam string steel and construction method |
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