CN218643216U - Traction system for bridge construction - Google Patents

Abstract

The utility model discloses a traction system for bridge construction, which comprises two anchoring wheels arranged at the two opposite sides of a traction target, and at least one winch positioned between the two anchoring wheels; the two traction groups are arranged corresponding to the two anchoring wheels, and each traction group comprises at least one traction wheel; the two orientation groups are arranged corresponding to the two anchoring wheels, each orientation group is positioned between the corresponding anchoring wheel and the traction group, the position of each orientation group relative to the corresponding anchoring wheel is unchanged, each orientation group comprises at least three orientation wheels, namely a first orientation wheel, a second orientation wheel and a third orientation wheel, and the number of the second orientation wheels is at least one; the circulating wire is wound on the two anchoring wheels, the two traction groups and the two orientation groups, the circulating wire is connected with the winch, and the part of the circulating wire between the single anchoring wheel and the traction target is a first wire and a second wire. When the traction system is used for traction, the required power is small, the stress of the traction rope is small, and the movement stability of the traction equipment or the traction device is high.

Description

Traction system for bridge construction

Technical Field

The utility model belongs to the technical field of the bridge engineering technique and specifically relates to a traction system is used in bridge construction.

Background

In bridge construction, the movement of heavy equipment or devices needs to be accomplished by a traction system. In the related art, the traction system directly connects the winch with the traction target through the traction rope, and for equipment or a device with large weight, the traction system needs large power, the traction rope is stressed greatly, and the movement stability of the equipment or the device to be dragged is poor.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a traction system is used in bridge construction, during traction system pulling equipment or device, required power is less, and the haulage rope atress is less, and is higher by pulling equipment or device mobility stability.

According to the utility model discloses traction system is used in bridge construction, include: two anchor wheels mounted on opposite sides of the towing target; the winch is arranged between the two anchoring wheels and can rotate forwards and backwards; two traction groups, wherein the two traction groups are arranged corresponding to the two anchoring wheels, each traction group comprises at least one traction wheel, and each traction wheel is suitable for being rotatably arranged on the traction target; two orientation groups, wherein the two orientation groups are arranged corresponding to the two anchoring wheels, each orientation group is positioned between the corresponding anchoring wheel and the traction group, the position of each orientation group relative to the corresponding anchoring wheel is unchanged, each orientation group comprises at least three orientation wheels, and the orientation wheels are a first orientation wheel, a second orientation wheel and a third orientation wheel, and the second orientation wheel is at least one; the circulating lead is wound on the two anchoring wheels, the two traction groups and the two orientation groups, the circulating lead is connected with the winch so as to draw the circulating lead to move when the winch rotates, and the part of the circulating lead between a single anchoring wheel and the traction target is a first lead and a second lead; wherein the first wire is wound from the anchoring wheel to the first orientation wheel in the corresponding orientation group and then to the third orientation wheel in the orientation group corresponding to the other anchoring wheel; wherein the second wire is wound from the anchoring wheel through the second orienting wheel of the corresponding orienting group, then alternated between the traction wheel and the orienting wheel, and finally wound through the third orienting wheel of the corresponding orienting group to the first orienting wheel of the orienting group corresponding to the other anchoring wheel.

According to the utility model discloses a traction system is used in bridge construction is around establishing two and pull the group through the circulation wire for during traction system pulling equipment or device, required power is less, and the haulage rope atress is less, and is higher by pulling equipment or device mobility stability.

According to the utility model discloses a some embodiments, traction system for bridge construction still includes: two trailing support wheels adapted to be rotatably mounted on the towing target; and in the circulating wire, a part of the circulating wire wound from the first orienting wheel in one orienting group to the third orienting wheel in the other orienting group is wound and supported by the following supporting wheels.

According to the utility model discloses a some embodiments, traction system for bridge construction still includes: the cable supporting trolley is arranged between the orientation group and the traction group, and a plurality of cable supporting wheels are arranged on the cable supporting trolley; for a single said anchor wheel, at least one of said first wire, said second wire, is routed through and supported by said headrope wheel.

According to some embodiments of the invention, the single guy wheel on the guy carriage comprises: the first guide wire is wound from the first direction wheel to the first support wheel and then is arranged towards the traction target; the second lead is wound from the third directional wheel to the third supporting wheel and then is arranged towards the traction target; the second supporting wheel is at least one, and the part of the second lead between the orientation wheel and the traction wheel is wound through the second supporting wheel.

According to some embodiments of the invention, the second caster wheel number is twice as many as the second orienting wheel.

According to some embodiments of the utility model, it is same on the cable car the coaxial setting of branch cable wheel.

According to some embodiments of the utility model, be equipped with on the funicular car and follow the walking wheel of the orbital motion of traction target.

According to some embodiments of the invention, each of said traction groups comprises at least two traction wheels arranged coaxially at an interval.

According to the utility model discloses a some embodiments, traction system for bridge construction still includes: a tensioning wheel located between the anchoring wheel and the orientation group, the circulating wire passing around and supported by the tensioning wheel.

According to the utility model discloses a some embodiments, traction system for bridge construction still includes: and the first wire on each anchoring wheel is wound to the directional group through one directional pulley, and the second wire on each anchoring wheel is wound to the directional group through the other directional pulley.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a drawing of a hoisting construction system for bridge construction according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a traction system for bridge construction according to an embodiment of the present invention.

Reference numerals are as follows:

a hoisting construction system 200,

A pulling target 101, a rib 102, a track 103 of the pulling target,

A traction system 100,

An anchoring wheel 1,

A windlass 2,

A traction group 3, a traction wheel 31,

An orientation group 4, an orientation wheel 41, a first orientation wheel 411, a second orientation wheel 412, a third orientation wheel 413,

A circulating wire 5, a first wire 51, a second wire 52,

A following supporting wheel 6,

A cable supporting vehicle 7, a cable supporting wheel 71, a first cable supporting wheel 711, a second cable supporting wheel 712, a third cable supporting wheel 713, a traveling wheel 72,

A tension wheel 8,

A directional pulley 9.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

The following describes a traction system 100 for bridge construction and a hoisting construction system 200 according to an embodiment of the present invention with reference to the drawings.

As shown in fig. 1 and 2, a traction system 100 for bridge construction according to an embodiment of the present invention includes two anchoring wheels 1, a winch 2, two traction groups 3, two orientation groups 4 and a circulation wire 5, the two anchoring wheels 1 are installed on opposite sides of a traction target 101, the winch 2 is at least one, the winch 2 is located between the two anchoring wheels 1, the winch 2 can rotate forward and backward, the two traction groups 3 are disposed corresponding to the two anchoring wheels 1, each traction group 3 includes at least one traction wheel 31, each traction wheel 31 is adapted to be rotatably installed on the traction target 101, the two orientation groups 4 are disposed corresponding to the two anchoring wheels 1, each orientation group 4 is located between the corresponding anchoring wheel 1 and the traction group 3, the position of each orientation group 4 with respect to the corresponding anchoring wheel 1 is unchanged, each orientation group 4 includes at least three orientation wheels 41, and are a first orienting wheel 411, a second orienting wheel 412 and a third orienting wheel 413, the second orienting wheel 412 being at least one, the circulation wire 5 being wound around the two anchoring wheels 1, the two traction groups 3, the two orienting groups 4, the circulation wire 5 being connected to the winding machine 2 to draw the circulation wire 5 to move when the winding machine 2 rotates, the portion of the circulation wire 5 between the single anchoring wheel 1 and the traction target 101 being a first wire 51 and a second wire 52, wherein the first wire 51 is wound from the anchoring wheel 1 through the first orientation wheel 411 in the corresponding orientation group 4, and then wound to the third orientation wheel 413 in the orientation group 4 corresponding to the other anchoring wheel 1, wherein the second wire 52 is wound from the anchoring wheel 1 through the second orientation wheel 412 of the corresponding orientation group 4, then alternates between the traction wheel 31 and the orientation wheel 41, and finally is wound through the third orientation wheel 413 of the corresponding orientation group 4 to the first orientation wheel 411 of the corresponding orientation group 4 of the other anchoring wheel 1.

It should be noted that the traction system 100 is fixed by the anchoring wheel 1, the hoist 2 provides traction power, the traction group 3 is arranged on the traction target 101, the hoist 2 is connected with the traction target 101 by the traction group 3, and the orientation group 4 is used for orienting the winding direction of the circulating wire 5 so as to wind the circulating wire along a specific direction.

Specifically, as shown in fig. 1 and fig. 2, the traction system 100 for bridge construction in the embodiment of the present invention includes two anchoring wheels 1, a winch 2, two traction groups 3, two orientation groups 4, and a circulation wire 5, where the two anchoring wheels 1 are installed on two opposite sides of a traction target 101. The winch 2 is at least one and is located between the two anchoring wheels 1, the winch 2 can rotate forwards and backwards, traction power is provided through the winch 2, and the traction target 101 can move back and forth due to the forward rotation and the reverse rotation of the winch 2. The two traction groups 3 are arranged corresponding to the two anchoring wheels 1, each traction group 3 comprises at least one traction wheel 31, each traction wheel 31 is suitable for being rotatably arranged on the traction target 101, the two traction groups 3 enable the traction target 101 to be drawn on two sides, the moving stability of the traction target 101 is improved, and the at least one traction wheel 31 rotatably arranged on the traction target 101 enables the traction target 101 to be moved in a rotating mode, so that labor is saved in moving. Two orientation groups 4 are arranged corresponding to the two anchor wheels 1, each orientation group 4 is arranged between the corresponding anchor wheel 1 and the traction group 3, the position of each orientation group 4 relative to the corresponding anchor wheel 1 is unchanged, the winding direction of the circulating lead 5 is changed through the orientation wheels 41, the winding of the circulating lead 5 is oriented, each orientation group 4 comprises at least three orientation wheels 41, and is a first orientation wheel 411, a second orientation wheel 412 and a third orientation wheel 413, the second orientation wheel 412 is at least one, the circulating lead 5 is wound on the two anchor wheels 1, the two traction groups 3 and the two orientation groups 4, the circulating lead 5 is connected with the winch 2 to pull the circulating lead 5 to move when the winch 2 rotates, the part of the circulating lead 5 between the single anchor wheel 1 and the traction target 101 is a first lead 51 and a second lead 52, wherein the first lead 51 is wound from the anchor wheel 1 to the first orientation wheel 411 in the corresponding orientation group 4, and then wound to the corresponding third orientation wheel 4 in the other anchor wheel 1, the corresponding orientation wheels 41, the third orientation wheels 41 and the third orientation wheels 413 are wound alternately from the corresponding orientation wheels 41 to the second orientation wheels 411 and the corresponding orientation wheels 413. The circulating lead 5 is sequentially wound by the winch 2 through the anchoring wheel 1, the directional wheel 41 and the traction wheel 31 on one side, the traction wheel 31, the directional wheel 41 and the anchoring wheel 1 on the other side and then wound back by the directional wheel 41 on the other side and the directional wheel 41 on one side to form a circulation through the first lead 51 and the second lead 52, the traction target 101 can stably move under the action of the traction wheels 31 on the two sides through the circulation, and the winch 2 can move the traction target 101 by providing small power through the arrangement of the traction wheels 31, so that the stress of the circulating lead 5 is reduced, and the service life of the circulating lead 5 is prolonged.

Wherein, as shown in fig. 2, the circulation wire 5 is wound alternately between the orientation group 4 and the traction group 3 in the sequence indicated by the numbers and arrows in fig. 2.

From this, according to the utility model discloses a traction system 100 is used in bridge construction through circulation wire 5 around establishing on the group 3 of pulling of both sides and directional group 4 for pull target 101 and can steadily move, and reduced hoist engine 2's power take off, prolonged circulation wire 5's life.

In contrast to some techniques, the traction system 100 connects the hoist 2 directly to the traction target 101 through a traction rope. This application is through circulating wire 5 around establishing on the group 3 of pulling of both sides and directional group 4 for 2 pulling equipment of hoist engine or device, required power is less, and the haulage rope atress is less, and is moved the poor higher of stability by pulling equipment or device.

In some embodiments, as shown in fig. 1, for example, in a hoisting construction system 200 for constructing an arch bridge, when hoisting equipment on an arch rib 102 is towed, two winches 2 are provided, the two winches 2 are provided on the same side of the length direction of the arch rib 102 and are provided at two ends in the width direction, each winch 2 is matched with two anchoring wheels 1, two towing groups 3, two orientation groups 4 and a circulation wire 5, and the two towing groups 3 connected to each winch 2 are connected to one bearing flat car of the hoisting equipment on the arch, so that two ends of the hoisting equipment on the arch in the width direction of the arch rib 102 are respectively towed by the two winches 2, and the two winches 2 can be towed synchronously through electrical connection, so that the hoisting equipment on the arch can move smoothly.

In some embodiments, as shown in fig. 2, two orientation groups 4 are fixed at both ends of the track 103 of the towing target, respectively. Two anchoring wheels 1 are respectively fixed on the ground at both ends of a track 103 of a traction target.

In some embodiments of the present invention, as shown in fig. 2, the traction system 100 for bridge construction further includes two traveling support wheels 6, the traveling support wheels 6 are adapted to be rotatably installed on the traction target 101, and in the circulation wire 5, a portion of the third directional wheel 413 in one directional group 4 is wound by the first directional wheel 411 in the other directional group 4, is wound and is supported by the traveling support wheels 6. The following supporting wheels 6 are rotatably connected with the traction target 101, so that the traction target 101 can move conveniently, the circulating lead 5 is supported, and the phenomenon that the circulating lead 5 falls down under the action of gravity and is wound by other structures between the first directional wheel 411 in one directional group 4 and the third directional wheel 413 in the other directional group 4 to influence the stable and safe movement of the traction target 101 is avoided.

Specifically, as shown in fig. 2, in the solution of the present application, two following support wheels 6 are disposed at two ends of the traction target 101 and symmetrically disposed, and support the traction target 101 at the two ends, which is beneficial to smooth movement of the traction target 101.

In some embodiments of the present invention, as shown in fig. 2, the traction system 100 for bridge construction further includes a cable car 7, the cable car 7 is disposed between the orientation group 4 and the traction group 3, a plurality of cable wheels 71 are disposed on the cable car 7, and at least one of the first wire 51 and the second wire 52 is wound around and supported by the cable wheels 71 for a single anchoring wheel 1. The cable carriage 7 slides along the rail 103 of the traction target by the cable pulley 71, and the cable pulley 71 supports at least one of the first and second wires 51 and 52.

In some embodiments of the present invention, as shown in fig. 2, the supporting wheels 71 on the single supporting vehicle 7 include a first supporting wheel 711, a second supporting wheel 712, and a third supporting wheel 713, the first conducting wire 51 is disposed toward the traction target 101 after passing through the first supporting wheel 711 from the first orientation wheel 411, the second conducting wire 52 is disposed toward the traction target 101 after passing through the third supporting wheel 713 from the third orientation wheel 413, the second supporting wheel 712 is at least one, and a portion of the second conducting wire 52 between the orientation wheel 41 and the traction wheel 31 passes through the second supporting wheel 712. The circulation wire 5 between the orientation wheel 41 and the traction wheel 31 is supported by the first supporting wheel 711 and the second supporting wheel 712, so that the circulation wire 5 is prevented from falling down by gravity.

In some embodiments of the present invention, as shown in fig. 2, the second supporting wheels 712 are twice as many as the second orienting wheels 412. By setting the number of the second supporting wheels 712 to be twice that of the second orientation wheels 412, each section of the circulating wire 5 between the second orientation wheels 412 and the traction wheel 31 is supported by the supporting wheels 71, so that on one hand, the stress is dispersed, and on the other hand, the contact or winding between the sections of the circulating wire 5 is avoided, which affects the operation of the traction system 100.

In some embodiments of the present invention, as shown in fig. 2, the cable pulley 71 is coaxially disposed on the same cable carriage 7. The upper cable wheel 71 of the same cable car 7 is coaxially arranged, so that the volume and the weight of the cable car 7 are reduced, and the cable car 7 can slide along the track 103 of the traction target.

In some embodiments of the present invention, as shown in fig. 2, the cable car 7 is provided with a traveling wheel 72 that travels along a track 103 of a traction target.

Specifically, as shown in fig. 2, two sets of the traveling wheels 72 are provided, and are respectively provided at both ends of the cable car 7, and the traveling wheels 72 limit the traveling of the cable car 7 in the width direction, thereby preventing the cable car 7 from being inclined during traveling.

In some embodiments of the present invention, as shown in fig. 2, the traction wheels 31 in each traction group 3 are at least two coaxially spaced apart wheels. At least two traction wheels 31 are coaxially arranged in each traction group 3 at intervals, so that the winch 2 can realize traction with smaller power.

Specifically, as shown in fig. 2, in the present embodiment, three traction wheels 31 are coaxially spaced in each traction group 3, and three corresponding second orienting wheels 412 are coaxially spaced.

Of course, the present solution is not limited thereto. In other embodiments, four or more traction wheels 31 are coaxially spaced in each traction group 3.

In some embodiments of the present invention, as shown in fig. 2, the traction system 100 for bridge construction further includes a tension wheel 8, the tension wheel 8 is located between the anchoring wheel 1 and the orientation group 4, and the circulation wire 5 is wound around and supported by the tension wheel 8. By arranging the tension wheel 8, the tension force is automatically adjusted according to different tightness degrees of the circulating lead 5, and the stable and safe operation of the traction system 100 is ensured.

In some embodiments of the present invention, as shown in fig. 2, the traction system 100 for bridge construction further includes a directional pulley 9, the first wire 51 of each anchoring wheel 1 is wound around a directional pulley 9 to the directional group 4, and the second wire 52 of each anchoring wheel 1 is wound around another directional pulley 9 to the directional group 4. The first wire 51 and the second wire 52 are wound in a certain direction by the directional pulley 9.

Specifically, the directional pulley 9 is fixedly disposed on the bottom surface.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A traction system for bridge construction, comprising:

two anchoring wheels (1), the two anchoring wheels (1) being mounted on opposite sides of a towing object (101);

the number of the winches (2) is at least one, the winches (2) are positioned between the two anchoring wheels (1), and the winches (2) can rotate forwards and backwards;

-two traction groups (3), said two traction groups (3) being arranged in correspondence of said two anchoring wheels (1), each traction group (3) comprising at least one traction wheel (31), each traction wheel (31) being adapted to be rotatably mounted on said traction target (101);

two orientation groups (4), said two orientation groups (4) being arranged in correspondence of said two anchoring wheels (1), each orientation group (4) being located between the corresponding anchoring wheel (1) and the traction group (3), each orientation group (4) being positionally invariant with respect to the corresponding anchoring wheel (1), each orientation group (4) comprising at least three orientation wheels (41) and being a first orientation wheel (411), a second orientation wheel (412) and a third orientation wheel (413), said second orientation wheel (412) being at least one;

the circulating wire is wound on the two anchoring wheels (1), the two traction groups (3) and the two orientation groups (4), the circulating wire is connected with the winch (2) to draw the circulating wire to move when the winch (2) rotates, and the part of the circulating wire between the single anchoring wheel (1) and the traction target (101) is a first wire (51) and a second wire (52);

wherein the first wire (51) is wound from the anchoring wheel (1) through the first orientation wheel (411) in the corresponding orientation group (4) and then wound to the third orientation wheel (413) in the orientation group (4) corresponding to the other anchoring wheel (1);

the second wire (52) is wound from the anchoring wheel (1) through the second orienting wheel (412) of the corresponding orienting group (4), then alternated between the traction wheel (31) and the orienting wheel (41), and finally through the third orienting wheel (413) of the corresponding orienting group (4) to the first orienting wheel (411) of the orienting group (4) of the other anchoring wheel (1).

2. The traction system for bridge construction according to claim 1, further comprising: -two trailing support wheels (6), said trailing support wheels (6) being adapted to be rotatably mounted on said traction target (101);

in the circulating wire, the part of the third directional wheel (413) wound by the first directional wheel (411) in one directional group (4) to the other directional group (4) is wound by the following support wheel (6) and supported.

3. The traction system for bridge construction according to claim 1, further comprising: the cable supporting trolley (7) is arranged between the orientation group (4) and the traction group (3), and a plurality of cable supporting wheels (71) are arranged on the cable supporting trolley (7);

for a single anchoring wheel (1), at least one of the first wire (51), the second wire (52) is wound around and supported by the stay wheel (71).

4. The bridge construction pulling system according to claim 3, wherein the stay wheels (71) on the single stay car (7) include: a first supporting wheel (711), a second supporting wheel (712), and a third supporting wheel (713), wherein the first wire (51) is wound around the first supporting wheel (711) from the first orientation wheel (411) and is arranged toward the traction target (101);

the second wire (52) is wound from the third orientation wheel (413) through the third supporting wheel (713) and is arranged towards the traction target (101);

the second supporting wheel (712) is at least one, and the part of the second wire (52) between the orientation wheel (41) and the traction wheel (31) is wound through the second supporting wheel (712).

5. The traction system for bridge construction according to claim 4, wherein the number of the second caster wheels (712) is twice as many as the number of the second directive wheels (412).

6. The traction system for bridge construction according to claim 4, wherein the cable supporting wheels (71) are coaxially arranged on the same cable supporting vehicle (7).

7. The traction system for bridge construction according to claim 4, wherein the cable-stayed vehicle (7) is provided with a travelling wheel (72) which travels along a track (103) of a traction target.

8. The traction system for bridge construction according to claim 1, wherein the traction wheels (31) in each traction group (3) are at least two coaxially spaced apart.

9. The traction system for bridge construction according to any one of claims 1 to 8, further comprising: a tensioning wheel (8), said tensioning wheel (8) being located between said anchoring wheel (1) and said orientation group (4), said endless wire being routed around and supported by said tensioning wheel (8).

10. The traction system for bridge construction according to any one of claims 1 to 8, further comprising: -a directional pulley (9), on each of said anchoring wheels (1) said first wire (51) being routed over one of said directional pulleys (9) to said directional group (4), on each of said anchoring wheels (1) said second wire (52) being routed over the other of said directional pulleys (9) to said directional group (4).

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