CN110700095A - Stay cable anchoring traction device of large-span cable-stayed bridge and traction construction method thereof - Google Patents
Stay cable anchoring traction device of large-span cable-stayed bridge and traction construction method thereof Download PDFInfo
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- CN110700095A CN110700095A CN201911065893.7A CN201911065893A CN110700095A CN 110700095 A CN110700095 A CN 110700095A CN 201911065893 A CN201911065893 A CN 201911065893A CN 110700095 A CN110700095 A CN 110700095A
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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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed 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 relates to a large-span cable-stayed bridge stay cable anchoring traction device and a traction construction method thereof, wherein the large-span cable-stayed bridge stay cable anchoring traction device comprises an anchoring box, a cable guide pipe, a traction device and a back pressure device, the anchoring box is provided with the cable guide pipe, one end of the cable guide pipe is positioned in the anchoring box, the other end of the cable guide pipe penetrates through the box wall of the anchoring box and is positioned outside the anchoring box, the traction device is arranged in the anchoring box, and the back pressure device is arranged on the anchoring box.
Description
Technical Field
The invention belongs to the technical field of construction of cable-stayed bridges, and particularly relates to a stay cable anchoring and traction device for a large-span cable-stayed bridge and a traction construction method thereof.
Background
With the continuous development of road and bridge technology, cable-stayed bridges are widely used as one of the main types of large-span bridges, and at present, the common cable-girder anchoring types in large-span cable-stayed bridges mainly include: anchor box type connection, ear plate type connection, anchor tube type connection and anchor pull plate connection. The anchoring mode of the anchoring box type cable beam is a combined structure which is composed of two different materials of steel and concrete and bears the tensile force jointly, and the combined structure has the characteristics of high structural strength, strong tensile capacity, convenient construction and high construction efficiency, so that the anchoring box type cable beam anchoring mode is generally adopted in the existing large-span cable-stayed bridge.
In the case of a cable-stayed bridge, the longer the span of the bridge, the longer the length and the larger the specification of the stay cable, and the greater the traction force at the beam end when the stay cable is installed. However, the internal space of the anchoring box is narrow, the operation construction space is limited, and the installation operation requirements of large traction equipment cannot be met, so that during the construction of the existing large-span cable-stayed bridge, the cable-beam anchoring construction is a difficult problem affecting the cable-stayed bridge construction, the construction efficiency and the construction period of the cable-stayed bridge are seriously affected, and the construction cost is increased.
Disclosure of Invention
In summary, in order to overcome the defects of the prior art, the invention provides a stay cable anchoring traction device of a large-span cable-stayed bridge and a traction construction method thereof, which combines two modes of steel strand soft traction and beam end back pressure, an anchor cup of a stay cable is penetrated into a cable guide pipe of an anchoring box from the outer end of the cable guide pipe of the anchoring box by the steel strand soft traction, and the anchor cup is pressed out along the cable guide pipe by the beam end back pressure to penetrate into the anchoring box and is locked, so that the installation and the fixation of the stay cable of the cable-stayed bridge are realized.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a large-span cable-stay bridge suspension cable anchor draw gear, wherein: the cable guide device comprises an anchoring box, a cable guide pipe, a traction device and a back pressure device, wherein the cable guide pipe is arranged on the anchoring box, one end of the cable guide pipe is positioned in the anchoring box, the other end of the cable guide pipe penetrates through the box wall of the anchoring box and is positioned outside the anchoring box, the traction device is arranged in the anchoring box and comprises a safety tension rod, a steel strand connector, a traction steel strand, a traction pressure bearing plate, a thrust roller bearing assembly and a traction jack assembly, the lower end of an anchor cup of a stay cable is connected with the upper end of the safety tension rod, the safety tension rod is a screw rod, the lower end of the safety tension rod penetrates into the cable guide pipe from one end of the cable guide pipe, which is positioned outside the anchoring box, the lower end of the safety tension rod is connected with the upper end of the traction steel strand through the steel strand connector, and the end surface of one end of the cable guide pipe, which is positioned in the anchoring box, the traction bearing plate is provided with a through hole for penetrating and installing a traction steel strand, the traction bearing plate is provided with a traction jack assembly on an upper frame, a thrust roller bearing assembly is arranged between the traction jack assembly and the traction bearing plate, the lower end of the traction steel strand sequentially passes through the through hole on the traction bearing plate and an inner hole of the thrust roller bearing assembly and then is connected with the traction jack assembly,
the anchoring box is provided with a back pressure device which comprises a back pressure support frame, a back pressure movable beam, a back pressure cylinder, a back pressure jack component and a back pressure steel strand, the back pressure support frame is erected on the anchoring box, the cable guide pipe on the anchoring box is arranged in the middle of the back pressure support frame, the outer sleeve of the stay cable is provided with a back pressure cylinder, the lower end of the back pressure cylinder is contacted with the upper end surface of the anchor cup of the stay cable, the upper end of the counter pressure cylinder is connected with the counter pressure movable beam, two sides of the counter pressure strut are respectively provided with a group of counter pressure steel strands, the two groups of counter pressure steel strands are symmetrically arranged by taking the cable guide pipe as the center, one end of each back pressure steel strand is connected with the back pressure support frame, the other end of each back pressure steel strand penetrates through the back pressure movable beam to be connected with the back pressure jack assemblies arranged on the back pressure movable beam, and the two groups of back pressure steel strands are respectively connected with the two back pressure jack assemblies.
The technical scheme of the invention can also be realized as follows: the upper end of the safety tension rod is connected with the lower end of an anchor cup of the stay cable through a traction connector, a threaded hole is formed in the lower end face of the anchor cup of the stay cable, the traction connector is a connecting sleeve provided with an external thread and an internal thread hole, the connecting sleeve is connected with the threaded hole of the anchor cup through the external thread, and the internal thread hole of the connecting sleeve is in threaded connection with the upper end of the safety tension rod.
The technical scheme of the invention can also be realized as follows: the back pressure strut comprises a lower back pressure beam, a connecting screw rod, an upper back pressure beam and a locking nut, wherein the lower back pressure beam and the upper back pressure beam are connected through the connecting screw rod, and the lower back pressure beam and the upper back pressure beam are clamped on the anchoring box and locked through the locking nut matched with the connecting screw rod.
The technical scheme of the invention can also be realized as follows: the traction jack assembly and the counter-pressure jack assembly are identical in structure and respectively comprise a jack, a small supporting leg, an inner tool anchor assembly and an outer tool anchor assembly, the jack is a through jack, a piston of the through jack is connected with the inner tool anchor assembly through the small supporting leg, and the cylinder body of the through jack is provided with the outer tool anchor assembly.
The technical scheme of the invention can also be realized as follows: the lower end of the traction steel strand sequentially penetrates through an inner tool anchor assembly of the traction jack assembly, the small supporting leg and an inner hole of the feed-through jack and then is connected with an outer tool anchor assembly.
The technical scheme of the invention can also be realized as follows: one end of the back pressure steel strand is connected with the back pressure support frame through the connector, and the other end of the back pressure steel strand penetrates through the back pressure movable beam, then sequentially penetrates through an inner tool anchor assembly, a small supporting leg and an inner hole of the penetrating type jack of the back pressure jack assembly, and finally is connected with an outer tool anchor assembly.
A traction construction method of a stay cable anchoring traction device of a large-span cable-stayed bridge is disclosed, wherein: the method comprises the following steps:
a. one end of the safety tension rod is connected with an anchor cup of the stay cable through a traction connector, and one end of a traction steel strand is arranged at the other end of the safety tension rod through a steel strand connector;
b. installing a traction bearing plate and a thrust roller bearing assembly on the end face of a cable guide pipe in an anchoring box, penetrating the other end of a traction steel strand into the cable guide pipe from one end of the cable guide pipe, which is positioned outside the anchoring box, sequentially penetrating an inner hole of the traction bearing plate and an inner hole of the thrust roller bearing assembly, sequentially penetrating an inner tool anchor assembly, a small supporting leg and a straight-through jack of a traction jack assembly, and finally clamping through an outer tool anchor assembly;
c. the method comprises the following steps that an oil pump is used for feeding oil into a penetrating jack of a traction jack assembly, a cylinder body of the penetrating jack extends out to drive an outer tool anchor assembly to clamp and draw a traction steel strand, at the moment, a clamping piece of an inner tool anchor assembly is in a loosening state, when the cylinder body of the penetrating jack reaches the maximum stroke, a piston of the penetrating jack acts to push the clamping piece of the inner tool anchor assembly to clamp and draw the steel strand, then, the penetrating jack returns oil, the cylinder body of the penetrating jack drives the outer tool anchor assembly to reset, at the moment, the clamping piece of the outer tool anchor assembly is in the loosening state, and the steps are repeated in a circulating mode;
d. after the anchor cup of the stay cable enters the cable guide pipe under the traction action of the traction steel strand, the oil pump is closed;
e. assembling a back pressure device on an anchoring box, arranging a lower back pressure beam and an upper back pressure beam on the anchoring box, clamping the anchoring box by the upper back pressure beam and the lower back pressure beam by adopting a connecting screw rod and a locking nut, connecting one end of a back pressure steel strand with the upper back pressure beam through a steel strand connector, wrapping a back pressure cylinder outside a stay cable, enabling the lower end of the back pressure cylinder to prop against the upper end face of an anchor cup of the stay cable, connecting the upper end of the back pressure cylinder with the middle part of the back pressure movable beam through a bolt, and sequentially installing an inner tool anchor assembly, a small supporting leg, a through type jack and an outer tool anchor assembly of a back pressure jack assembly after the other end of the back pressure steel strand penetrates through two sides of the back pressure movable beam;
f. the method comprises the steps that an oil pump is used for supplying oil to the penetrating jacks of two counter-pressure jack assemblies simultaneously, cylinder bodies of the two penetrating jacks extend out simultaneously to drive respective outer tool anchor assemblies to clamp and pull a steel strand to be stretched, under the action of carrier gas stretching counter force, a counter-pressure movable beam moves towards an anchoring box to drive a counter-pressure cylinder to push an anchor cup of a stay cable to move towards a cable guide pipe, when the steel strand is pulled to be stretched, a clamping piece of an inner tool anchor assembly is in a loosening state, after the cylinder body of the penetrating jack reaches the maximum stroke, a piston of the penetrating jack acts to push the clamping piece of the inner tool anchor assembly to clamp and pull the steel strand, then the penetrating jacks return oil, the cylinder body of the penetrating jacks drives the outer tool anchor assemblies to reset, at the moment, the clamping piece of the outer tool anchor assembly is in a loosening state, and the process is repeated;
g. the back pressure cylinder pushes an anchor cup of the stay cable to move towards the inside of the anchoring box along the cable guide pipe, when a steel stranded wire connector connected to the anchor cup is pushed out of the cable guide pipe, one end of the safety tension rod connected with the steel stranded wire connector extends into the anchoring box, at the moment, the steel stranded wire connector, a traction steel stranded wire, a traction pressure bearing plate, a thrust roller bearing and a traction jack assembly of a traction device in the anchoring box are disassembled, the safety tension rod of the traction device and the traction connector connecting the safety tension rod with the anchor cup are reserved, and a safety tension nut is installed at one end of the safety tension rod, which is positioned in the anchoring box;
h. and f, repeating the step f, continuously pushing the anchor cup of the stay cable to move towards the anchoring box along the cable guide pipe by the back pressure cylinder, simultaneously screwing the safety tensioning nut on the safety tensioning rod from the anchoring box, after the back pressure cylinder pushes the anchor cup of the stay cable out of the cable guide pipe, detaching the tensioning nut on the safety tensioning rod, and then installing the anchor cup nut to a designed position, so that the construction of anchoring and traction of the stay cable of the large-span cable-stayed bridge is completed.
Has the advantages that:
1. the invention combines the steel strand soft traction mode and the beam end back pressure mode, the steel strand soft traction mode is utilized to lead the anchor cup of the stayed-cable into the cable guide pipe of the anchoring box from the outer end of the cable guide pipe of the anchoring box, and the beam end back pressure mode is utilized to lead the anchor cup out along the cable guide pipe to be led into the anchoring box and locked, thus realizing the installation and fixation of the stayed-cable bridge.
2. The traction device of the invention uses the traction bearing plate and the thrust roller bearing assembly arranged on the cable guide pipe as the support of the traction jack assembly, and does not need to additionally arrange a supporting leg device, thereby saving the operation space in the anchoring box.
3. The invention utilizes the traction device and the back pressure device to carry out traction and anchoring construction on the stayed-cable of the cable-stayed bridge, and the back pressure device simultaneously acts on the back pressure movable beam through the two sets of back pressure jack components, thereby providing larger acting force for the traction and anchoring of the stayed-cable and meeting the traction force requirement required by the stayed-cable anchoring of the large-span cable-stayed bridge.
4. The invention has simple structure, convenient use and low cost, realizes the installation and anchoring of the stay cable by utilizing the combined action of the traction device and the back pressure device, has novel and ingenious conception, has simple operation because the back pressure jack component and the traction jack component are the existing common equipment for the stay cable anchoring, can realize the installation and anchoring construction of the stay cable of the large-span cable-stayed bridge, effectively improves the construction efficiency of the large-span cable-stayed bridge, reduces the cost and saves the labor force.
Drawings
FIG. 1 is a schematic structural view of a draft gear of the present invention;
FIG. 2 is a schematic view of the structure of the back pressure device of the present invention;
fig. 3 is a schematic side view of the back pressure device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, a stay cable anchoring traction device for a large-span cable-stayed bridge is provided, wherein: the cable comprises an anchoring box 1, a cable guide pipe 2, a traction device and a back pressure device, wherein the cable guide pipe 2 is arranged on the anchoring box 1, one end of the cable guide pipe 2 is positioned in the anchoring box 1, the other end of the cable guide pipe penetrates through the box wall of the anchoring box 1 and is positioned outside the anchoring box 1, the traction device is arranged in the anchoring box 1 and comprises a safety tension rod 3, a steel strand connector 4, a traction steel strand 5, a traction pressure bearing plate 6, a thrust roller bearing assembly 7 and a traction jack assembly 8, the safety tension rod 3 is a screw rod, the upper end of the safety tension rod 3 is connected with the lower end of an anchor cup 10 of a stay cable 9 through a traction connector 16, a threaded hole is formed in the lower end face of the anchor cup 10 of the stay cable 9, the traction connector 16 is a connecting sleeve provided with an external thread and an internal threaded hole, and the connecting sleeve is connected with the threaded hole of the anchor cup 10 through the external thread, the inner threaded hole of the connecting sleeve is in threaded connection with the upper end of the safety tension rod 3, the lower end of the safety tension rod 3 penetrates into the cable guide pipe 2 from one end, located outside the anchoring box 1, of the cable guide pipe 2, the lower end of the safety tension rod 3 is connected with the upper end of the traction steel strand 5 through the steel strand connector 4, a traction bearing plate 6 is arranged on the end face of one end, located inside the anchoring box 1, of the cable guide pipe 2, a through hole for penetrating and installing the traction steel strand 5 is formed in the traction bearing plate 6, a traction jack assembly 8 is erected on the traction bearing plate 6, a thrust roller bearing assembly 7 is arranged between the traction jack assembly 8 and the traction bearing plate 6, and the lower end of the traction steel strand 5 sequentially penetrates through the through hole in the traction bearing plate 6 and an inner hole of the thrust roller bearing assembly 7 to be connected with the traction jack assembly 8, the traction jack component 8 comprises a jack 20, a small supporting foot 21, an inner tool anchor component 22 and an outer tool anchor component 23, the jack 20 is a through jack 20, a piston of the through jack 20 is connected with the inner tool anchor component 22 through the small supporting foot 21, and the cylinder body of the through jack 20 is provided with the outer tool anchor component 23. Interior instrument anchor subassembly 22 and outer instrument anchor subassembly 23 the same structure, all include instrument anchor slab and clamping piece, interior instrument anchor subassembly 22 the instrument anchor slab be connected with thrust roller bearing assembly 7's bearing frame, interior instrument anchor subassembly 22 the clamping piece be connected with the piston of punching jack 20, the lower extreme of drawing steel strand wires 5 pass in proper order and draw behind interior instrument anchor subassembly 22, little spike 21 of jack subassembly 8, the hole of punching jack 20, be connected with outer instrument anchor subassembly 23.
The anchoring box 1 is provided with a back pressure device, the back pressure device comprises a back pressure support frame 11, a back pressure movable beam 12, a back pressure cylinder 13, a back pressure jack assembly 15 and a back pressure steel strand 14, the back pressure support frame 11 comprises a lower back pressure beam 17, a connecting screw rod 18, an upper back pressure beam 19 and a locking nut, the lower back pressure beam 17 and the upper back pressure beam 19 are connected through the connecting screw rod 18, and the lower back pressure beam 17 and the upper back pressure beam 19 are clamped on the anchoring box 1 and locked through the locking nut matched with the connecting screw rod 18. The cable guide pipe 2 on the anchoring box 1 is arranged in the middle of a back pressure support frame 11, a back pressure cylinder 13 is sleeved outside a stay cable 9, the lower end of the back pressure cylinder 13 is in end face contact with the upper end of an anchor cup 10 of the stay cable 9, the upper end of the back pressure cylinder 13 is connected with a back pressure movable beam 12, a group of back pressure steel strands 14 are respectively arranged on two sides of the back pressure support frame 11, the two groups of back pressure steel strands 14 are symmetrically arranged by taking the cable guide pipe 2 as a center, one end of the back pressure steel strand 14 is connected with the back pressure support frame 11 through a steel strand connector 4, the other end of the back pressure steel strand 14 penetrates through the back pressure movable beam 12 to be connected with a back pressure jack assembly 15 arranged on the back pressure movable beam 12, and the two groups of back pressure steel strands 14 are respectively connected with the. The structure of the back pressure jack component 15 is the same and comprises a jack 20, a small supporting foot 21, an inner tool anchor component 22 and an outer tool anchor component 23, the jack 20 is a through jack 20, a piston of the through jack 20 is connected with the inner tool anchor component 22 through the small supporting foot 21, and the cylinder body of the through jack 20 is provided with the outer tool anchor component 23. One end of the back pressure steel strand 14 is connected with the back pressure support frame 11 through a connector, and the other end of the back pressure steel strand 14 passes through the back pressure movable beam 12, then sequentially passes through an inner tool anchor component 22, a small supporting leg 21 and an inner hole of the through type jack 20 of the back pressure jack component 15, and finally is connected with an outer tool anchor component 23.
A traction construction method of a large-span cable-stayed bridge stay cable 9 anchoring traction device is disclosed, wherein: the method comprises the following steps:
a. one end of a safety tension rod 3 is connected with an anchor cup 10 of a stay cable 9 through a traction connector 16, and one end of a traction steel strand 5 is arranged at the other end of the safety tension rod 3 through a steel strand connector 4;
b. installing a traction bearing plate 6 and a thrust roller bearing assembly 7 on the end surface of a cable guide pipe 2 in an anchoring box 1, penetrating the other end of a traction steel strand 5 into the cable guide pipe 2 from one end of the cable guide pipe 2, which is positioned outside the anchoring box 1, then sequentially penetrating an inner hole of the traction bearing plate 6 and an inner hole of the thrust roller bearing assembly 7, then sequentially penetrating an inner tool anchor assembly 22, a small supporting leg 21 and a through type jack 20 of a traction jack assembly 8, and finally clamping through an outer tool anchor assembly 23;
c. an oil pump is used for feeding oil into a penetrating jack 20 of a traction jack assembly 8, a cylinder body of the penetrating jack 20 extends out to drive an outer tool anchor assembly 23 to clamp and draw a traction steel strand 5, at the moment, a clamping piece of an inner tool anchor assembly 22 is in a loosening state, when the cylinder body of the penetrating jack 20 reaches the maximum stroke, a piston of the penetrating jack 20 acts to push the clamping piece of the inner tool anchor assembly 22 to clamp and draw the steel strand 5, then, the penetrating jack 20 returns oil, the cylinder body of the penetrating jack 20 drives the outer tool anchor assembly 23 to reset, at the moment, the clamping piece of the outer tool anchor assembly 23 is in the loosening state, and the operation is repeated in a circulating mode;
d. after the anchor cup 10 of the stay cable 9 enters the cable guide pipe under the traction action of the traction steel strand 5, the oil pump is closed;
e. assembling a back pressure device on an anchoring box 1, firstly arranging a lower back pressure beam 17 and an upper back pressure beam 19 on the anchoring box 1, clamping the anchoring box 1 by the upper back pressure beam 19 and the lower back pressure beam 17 by adopting a connecting screw rod 18 and a locking nut, connecting one end of a back pressure steel strand 14 with the upper back pressure beam 19 through a steel strand connector 4, wrapping a back pressure cylinder 13 outside a stay cable 9, enabling the lower end of the back pressure cylinder 13 to prop against the upper end surface of an anchor cup 10 of the stay cable 9, connecting the upper end of the back pressure cylinder 13 with the middle part of a back pressure movable beam 12 through a bolt, and sequentially installing an inner tool anchor assembly 22, a small supporting leg 21, a penetrating type jack 20 and an outer tool anchor assembly 23 of a back pressure jack assembly 15 after the other end of the steel strand 14 penetrates through two sides of the back pressure movable beam 12;
f. an oil pump is used for supplying oil to the through jacks 20 of the two back pressure jack assemblies 15 at the same time, the cylinder bodies of the two through jacks 20 extend out at the same time to drive the respective outer tool anchor assemblies 23 to clamp and pull the traction steel strand 5, the back pressure movable beam 12 moves towards the anchoring box 1 under the action of the stretching counter force of carrier gas to drive the counter pressure cylinder 13 to push the anchor cup 10 of the stay cable 9 to move towards the cable guide pipe 2, when the traction steel strand 5 is stretched, the clamping piece of the inner tool anchor assembly 22 is in a loose state, when the cylinder body of the through jack 20 reaches the maximum stroke, the piston of the through jack 20 acts to push the clamping piece of the inner tool anchor assembly 22 to clamp and pull the steel strand 5, then the through jack 20 returns oil, the cylinder body of the through jack 20 drives the outer tool anchor assembly 23 to reset, at the moment, the clamping piece of the outer tool anchor assembly 23 is in a loosening state, and the process is repeated;
g. the back pressure cylinder 13 pushes the anchor cup 10 of the stay cable 9 to move towards the inside of the anchor box 1 along the cable guide pipe 2, when the steel stranded wire connector 4 connected to the anchor cup 10 is pushed out from the inside of the cable guide pipe 2, the end of the safety tension rod 3 connected to the steel stranded wire connector 4 extends into the inside of the anchor box 1, at the moment, the steel stranded wire connector 4 of the traction device, the traction steel stranded wire 5, the traction pressure bearing plate 6, the thrust roller bearing and the traction jack assembly 8 in the anchor box 1 are removed, the safety tension rod 3 of the traction device and the traction connector 16 connecting the safety tension rod 3 and the anchor cup 10 are reserved, and a safety tension nut is installed at the end of the tension rod 3 positioned in the anchor box 1;
h. and f, repeating the step f, continuously pushing the anchor cup 10 of the stay cable 9 to move towards the anchoring box 1 along the cable guide pipe 2 by the back pressure cylinder 13, simultaneously screwing the safety tension nut on the safety tension rod 3 from the anchoring box 1, detaching the tension nut on the safety tension rod 3 after the back pressure cylinder 13 pushes the anchor cup 10 of the stay cable 9 out of the cable guide pipe 2, and then installing the anchor cup 10 nut to a designed position, so that the anchoring traction construction of the stay cable 9 of the large-span cable-stayed bridge is completed.
It should be noted that the above-mentioned embodiments illustrate rather than limit the technical solutions of the present invention, and that equivalent substitutions or other modifications made by persons skilled in the art according to the prior art are included in the scope of the claims of the present invention as long as they do not exceed the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides a large-span cable-stay bridge suspension cable anchor draw gear which characterized in that: the cable traction device comprises an anchoring box (1), a cable guide pipe (2), a traction device and a back pressure device, wherein the cable guide pipe (2) is arranged on the anchoring box (1), one end of the cable guide pipe (2) is positioned in the anchoring box (1), the other end of the cable guide pipe penetrates through the box wall of the anchoring box (1) and is positioned outside the anchoring box (1), the traction device is arranged in the anchoring box (1), the traction device comprises a tension safety rod (3), a steel strand connector (4), a traction steel strand (5), a traction pressure bearing plate (6), a thrust roller bearing assembly (7) and a traction jack assembly (8), the lower end of an anchor cup (10) of a stay cable (9) is connected with the upper end of the tension safety rod (3), the tension safety rod (3) is a screw rod, the lower end of the tension safety rod (3) penetrates into the cable guide pipe (2) from one end, positioned outside the anchoring box (1), of the cable guide pipe (2), the lower end of the safety tension rod (3) is connected with the upper end of a traction steel strand (5) through a steel strand connector (4), the end face of one end, located in the anchoring box (1), of the cable guide pipe (2) is provided with a traction bearing plate (6), the traction bearing plate (6) is provided with a through hole for penetrating and installing the traction steel strand (5), the traction bearing plate (6) is erected with a traction jack assembly (8), a thrust roller bearing assembly (7) is arranged between the traction jack assembly (8) and the traction bearing plate (6), the lower end of the traction steel strand (5) sequentially penetrates through the through hole in the traction bearing plate (6) and the inner hole of the thrust roller bearing assembly (7) and then is connected with the traction jack assembly (8),
the anchor box (1) is provided with a back pressure device, the back pressure device comprises a back pressure support frame (11), a back pressure movable beam (12), a back pressure cylinder (13), a back pressure jack assembly (15) and back pressure steel strands (14), the back pressure support frame (11) is erected on the anchor box (1), the cable guide pipes (2) on the anchor box (1) are arranged in the middle of the back pressure support frame (11), the back pressure cylinder (13) is sleeved outside the stay cable (9), the lower end of the back pressure cylinder (13) is in end face contact with the upper end of the anchor cup (10) of the stay cable (9), the upper end of the back pressure cylinder (13) is connected with the back pressure movable beam (12), two sides of the back pressure support frame (11) are respectively provided with a group of back pressure steel strands (14), the two groups of back pressure steel strands (14) are symmetrically arranged by taking the cable guide pipes (2) as centers, one end of each back pressure steel strand (14) is connected with the back pressure support frame (11), the other ends of the back pressure steel strands (14) penetrate through the back pressure movable beam (12) to be connected with back pressure jack assemblies (15) arranged on the back pressure movable beam (12), and the two groups of back pressure steel strands (14) are respectively connected with the two back pressure jack assemblies (15).
2. The large-span cable-stayed bridge stay cable anchoring traction device according to claim 1, characterized in that: the upper end of the safety tension rod (3) is connected with the lower end of an anchor cup (10) of a stay cable (9) through a traction connector (16), a threaded hole is formed in the lower end face of the anchor cup (10) of the stay cable (9), the traction connector (16) is a connecting sleeve provided with an external thread and an internal threaded hole, the connecting sleeve is connected with the threaded hole of the anchor cup (10) through the external thread, and the internal threaded hole of the connecting sleeve is in threaded connection with the upper end of the safety tension rod (3).
3. The large-span cable-stayed bridge stay cable anchoring traction device according to claim 1, characterized in that: the back pressure strut (11) comprises a lower back pressure beam (17), a connecting screw rod (18), an upper back pressure beam (19) and a locking nut, wherein the lower back pressure beam (17) and the upper back pressure beam (19) are connected through the connecting screw rod (18), and the lower back pressure beam (17) and the upper back pressure beam (19) are clamped on the anchoring box (1) and locked through the locking nut matched with the connecting screw rod (18).
4. The large-span cable-stayed bridge stay cable anchoring traction device according to claim 1, characterized in that: traction jack subassembly (8) and back pressure jack subassembly (15) structure the same, all include jack (20), little spike (21), interior instrument anchor subassembly (22) and outer instrument anchor subassembly (23), jack (20) be punching jack (20), the piston of punching jack (20) pass through little spike (21) and connect interior instrument anchor subassembly (22), the cylinder body of punching jack (20) on be provided with outer instrument anchor subassembly (23).
5. The large-span cable-stayed bridge cable-stayed anchoring traction device according to claim 4, characterized in that: the lower end of the traction steel strand (5) sequentially penetrates through inner holes of an inner tool anchor component (22), a small supporting foot (21) and a through jack (20) of the traction jack component (8) and then is connected with an outer tool anchor component (23).
6. The large-span cable-stayed bridge cable-stayed anchoring traction device according to claim 5, characterized in that: one end of the back pressure steel strand (14) is connected with the back pressure support frame (11) through the connector, and the other end of the back pressure steel strand (14) penetrates through the back pressure movable beam (12), then sequentially penetrates through an inner tool anchor assembly (22), a small supporting foot (21) and an inner hole of the back pressure jack assembly (15), and finally is connected with an outer tool anchor assembly (23).
7. The traction construction method for the stay cable anchoring traction device of the large-span cable-stayed bridge according to any one of the claims 1 ~ 6, characterized by comprising the following steps:
a. one end of a safety tension rod (3) is connected with an anchor cup (10) of a stay cable (9) through a traction connector (16), and one end of a traction steel strand (5) is installed at the other end of the safety tension rod (3) through a steel strand connector (4);
b. the end face of a cable guide pipe (2) in an anchoring box (1) is provided with a traction pressure-bearing plate (6) and a thrust roller bearing assembly (7), the other end of a traction steel strand (5) penetrates into the cable guide pipe (2) from one end of the cable guide pipe (2) which is positioned outside the anchoring box (1), then sequentially penetrates through an inner hole of the traction pressure-bearing plate (6) and an inner hole of the thrust roller bearing assembly (7), then sequentially penetrates through an inner tool anchor assembly (22), a small supporting foot (21) and a through type jack (20) of a traction jack assembly (8), and finally is clamped through an outer tool anchor assembly (23);
c. the method comprises the steps that an oil pump is used for enabling a feed-through jack (20) of a traction jack assembly (8) to feed oil, a cylinder body of the feed-through jack (20) extends out to drive an outer tool anchor assembly (23) to clamp and pull a traction steel strand (5) to stretch, at the moment, a clamping piece of an inner tool anchor assembly (22) is in a loosening state, when the cylinder body of the feed-through jack (20) reaches the maximum stroke, a piston of the feed-through jack (20) acts to push the clamping piece of the inner tool anchor assembly (22) to clamp and pull the traction steel strand (5), then the feed-through jack (20) returns oil, the cylinder body of the feed-through jack (20) drives the outer tool anchor assembly (23) to reset, at the moment, the clamping piece of the outer tool anchor assembly (23) is in a loosening state, and the process is repeated in a;
d. after an anchor cup (10) of the stay cable (9) enters the cable guide pipe under the traction action of the traction steel strand (5), the oil pump is closed;
e. assembling a back pressure device on an anchoring box (1), firstly arranging a lower back pressure beam (17) and an upper back pressure beam (19) on the anchoring box (1), clamping the anchoring box (1) by the upper back pressure beam (19) and the lower back pressure beam (17) by adopting a connecting screw rod (18) and a locking nut, connecting one end of a back pressure steel strand (14) with the upper back pressure beam (19) through a steel strand connector (4), wrapping a back pressure cylinder (13) outside a stay cable (9), and propping the lower end surface of the back pressure cylinder (13) against the upper end surface of an anchor cup (10) of the stay cable (9), the upper end of the back pressure cylinder (13) is connected with the middle part of the back pressure movable beam (12) through a bolt, after the other end of the back pressure steel strand (14) passes through the two sides of the back pressure movable beam (12), an inner tool anchor component (22), a small supporting leg (21), a feed-through jack (20) and an outer tool anchor component (23) of the back pressure jack component (15) are sequentially installed;
f. an oil pump is used for simultaneously supplying oil to the through jacks (20) of the two counter pressure jack assemblies (15), the cylinder bodies of the two through jacks (20) simultaneously extend out to drive the respective outer tool anchor assemblies (23) to clamp and pull the steel strand (5), under the action of carrier gas stretching counter force, the counter pressure movable beam (12) moves towards the anchoring box (1) to drive the counter pressure cylinder (13) to push the anchor cup (10) of the stay cable (9) to move towards the cable guide pipe (2), when the pulling steel strand (5) is stretched, the clamping piece of the inner tool anchor assembly (22) is in a loose state, when the cylinder body of the through jack (20) reaches the maximum stroke, the piston of the through jack (20) acts to push the clamping piece of the inner tool anchor assembly (22) to pull the steel strand (5), then the through jack (20) returns oil, the cylinder body of the through jack (20) drives the outer tool anchor assemblies (23) to reset, at the moment, the clamping piece of the outer tool anchor assembly (23) is in a loosening state, and the process is repeated in a circulating mode;
g. a back pressure cylinder (13) pushes an anchor cup (10) of a stay cable (9) to move towards an anchor box (1) along a cable guide pipe (2), when a steel stranded wire connector (4) connected to the anchor cup (10) is pushed out of the cable guide pipe (2), one end of a safety tension rod (3) connected with the steel stranded wire connector (4) extends into the anchor box (1), the steel stranded wire connector (4), a traction steel stranded wire (5), a traction pressure bearing plate (6), a thrust roller bearing and a traction jack assembly (8) of a traction device in the anchor box (1) are removed, the safety tension rod (3) of the traction device and a traction connector (16) connecting the safety tension rod (3) with the anchor cup (10) are reserved, and a safety tension nut is installed at one end of the safety tension rod (3) located in the anchor box (1);
h. and f, repeating the step f, continuously pushing the anchor cup (10) of the stay cable (9) to move into the anchor box (1) along the cable guide pipe (2) by the back pressure cylinder (13), simultaneously screwing the safety tension nut on the safety tension rod (3) from the anchor box (1), after the anchor cup (10) of the stay cable (9) is pushed out from the cable guide pipe (2) by the back pressure cylinder (13), dismounting the tension nut on the safety tension rod (3), and then mounting the anchor cup (10) nut to a designed position, so as to finish the anchoring traction construction of the stay cable (9) of the large-span cable-stayed bridge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911065893.7A CN110700095A (en) | 2019-11-04 | 2019-11-04 | Stay cable anchoring traction device of large-span cable-stayed bridge and traction construction method thereof |
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| CN201911065893.7A CN110700095A (en) | 2019-11-04 | 2019-11-04 | Stay cable anchoring traction device of large-span cable-stayed bridge and traction construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235436A (en) * | 2021-04-28 | 2021-08-10 | 中交二航局第二工程有限公司 | Temporary inhaul cable construction method suitable for cable-first and beam-second construction of suspension bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235436A (en) * | 2021-04-28 | 2021-08-10 | 中交二航局第二工程有限公司 | Temporary inhaul cable construction method suitable for cable-first and beam-second construction of suspension bridge |
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