Suspension bridge cable clamp device of formula of partly striding
Technical Field
The utility model relates to a cable clamp device of a suspension bridge in bridge engineering, in particular to a cable clamp device of a semi-straddle type suspension bridge.
Background
The suspension bridge has the advantages of clear stress, strong spanning capability, attractive appearance, great vigor and the like, so the suspension bridge is widely advocated in the field of large-span bridges and urban landscape bridges. The main beam dead weight and the vehicle load of the suspension bridge are transmitted to the main cable through the sling, and the transmission effectiveness is realized by reasonably arranging the cable clamp, so the reliability of the cable clamp structure directly influences the safety of the full bridge of the suspension bridge.
Although the cable clip in the suspension bridge also comprises a tightening cable clip for shaping the main cable and a closed cable clip for protecting and sealing the outlet of the main cable saddle and the anchor, the cable clip only refers to a sling cable clip for connecting the main cable and the sling, and the number of the sling cable clip is far more than that of the other two types of cable clips.
The cable clamp can be divided into a riding type and a pin hinge type according to different connection modes of the sling on the cable clamp. Striding type cable clip and slotting at the cable clip top, the cable clip is striden in the inslot to the hoist cable card, and the both ends of hoist cable are all connected at roof beam portion, and this type cable clip presss from both sides body structure simpler, but the hoist cable can produce certain bending stress at the constant head tank tip, and the main push-towing rope diameter is less, and this bending stress is big more. The pin hinge type cable clamp is provided with an ear plate at the lower part of the circular clamp body, the ear plate is provided with a hole for the pin rod to pass through so as to be connected with the cable, the other end of the cable is connected to the main beam, and the cable has no bending stress, so that the pin hinge type cable clamp is greatly used relative to the straddle type cable clamp. The cable clamp body mainly adopts two cast steel semicircular components, and is butted by a high-strength bolt during installation, and the butt joint mode is generally divided into up-down butt joint and left-right butt joint. The pin hinge type connection is generally designed in an up-and-down butt joint mode, and the high-strength bolt needs to transmit the tensile force of a sling, so that the total axial force of the bolt is large. The straddle type cable clamp adopts a left-right butt joint design, and the high-strength bolt of the straddle type cable clamp has small total bolt axial force and is economical to use because the tensile force of a sling does not need to be transmitted. Therefore, the straddle type cable clip has advantages over the pin hinge type cable clip for a large span suspension bridge.
When the deck is subjected to a vehicle load, the top region of the main cable within the clip is subjected to increased compressive stress and the bottom region is subjected to reduced compressive stress. Considering that the pretension force of the screw rod is lost during service, the compressive stress of the whole section in the main cable is reduced, and the tightening effect of the cable clamp on the main cable is reduced. In extreme cases, even the bottom area of the main cable is separated from the cable clamp and separated, and the skid resistance of the straddle type cable clamp is seriously influenced.
Disclosure of Invention
The utility model solves the technical problem that the anti-skid performance of the suspension bridge cable clamp in the prior art is reduced when the suspension bridge cable clamp is subjected to the pulling force of a sling during service, and provides the semi-riding type suspension bridge cable clamp device which is reasonable in structure, safe and reliable.
The technical scheme of the utility model is to provide a semi-straddle type suspension bridge cable clamp device with the following structure: comprises a rope clamp body and a sling; the cable clamp body is of a half-cable clamp body, and comprises a first half cable clamp body of an arc-shaped body and a second half cable clamp body of the arc-shaped body, wherein the first half cable clamp body and the second half cable clamp body are provided with extended fixing lugs at splicing positions, and the fixing lugs are correspondingly provided with screw holes; the half cable clamp body I and the half cable clamp body II are provided with positioning steps which are embedded with each other at the splicing position, the half cable clamp body I and the half cable clamp body II are sleeved on a main cable of a suspension bridge after being spliced, a bolt fastens the half cable clamp body I and the half cable clamp body II through a fixing lug, and a gap is reserved at the splicing position of the half cable clamp body I and the half cable clamp body II; the lower end of the sling is connected with a main beam, and the upper end of the sling is connected with an anchoring block positioned on the second half cable clamp body through a connecting device after straddling the outer side wall of the first half cable clamp body; the anchoring block is positioned on the outer side wall of the second half cable clamp body or is connected with the fixing lug of the second half cable clamp body into a whole; the outer side wall of the cable clamp body is provided with a riding groove which is shaped into a plurality of radial non-crossed space curves; the port of the riding groove at one side of the main beam connected by the sling is a divergent flaring.
Preferably, the connecting device comprises an anchor head at the upper end of the sling and an anchor block, wherein the anchor block is an opening lug or an inserting lug with a pin hole.
Preferably, the connecting device comprises an anchor head at the upper end of the sling, an anchoring block and a connecting piece for connecting the anchor head and the anchoring block, wherein the anchoring block is an opening lug or an inserting lug with a pin hole.
Preferably, the connecting piece is an arc-shaped body which is in fit contact with the outer wall of the cable clamp body.
Preferably, the first half cable clamp body and the second half cable clamp body are in up-down butt joint, and openings on two sides of the straddling groove are respectively and simultaneously located on the side wall of the first half cable clamp body, the side wall of the second half cable clamp body or the side walls of the first half cable clamp body and the second half cable clamp body.
Preferably, the riding starting point of the sling is arranged on the fixing lug of the second half cable clamp body on one side of the main cable, and the anchoring block is integrated with the fixing lug of the second half cable clamp body on the other side of the main cable.
Preferably, the first half cable clamp body and the second half cable clamp body are in left-right butt joint, and openings on two sides of the straddling groove are respectively located on the side wall of the first half cable clamp body and the side wall of the second half cable clamp body or respectively located on the side wall of the first half cable clamp body and the side wall of the second half cable clamp body.
Preferably, the riding starting point of the sling is arranged on the outer side wall of the first half cable clamp body, and the anchoring block is integrated with the fixing lug of the second half cable clamp body, which is positioned on the upper side of the main cable.
Preferably, the riding starting point of the sling is arranged on the outer side wall of the second half cable clamp body, the sling rides on the second half cable clamp body and the first half cable clamp body, and the anchoring block and the fixing lug of the second half cable clamp body, which is positioned on the lower side of the main cable, are integrated.
Preferably, the first half cable clamp body and/or the second half cable clamp body comprise a plurality of cable separating clamping pieces, the splicing positions between the corresponding cable separating clamping pieces are provided with extended fixing lugs, and the fixing lugs are correspondingly provided with screw holes; the cable separating clamping pieces are provided with positioning steps which are embedded mutually at the splicing positions.
Compared with the prior art, the semi-straddle type suspension bridge cable clamp device has the following advantages:
1. the cable clamp provided by the utility model adopts a semi-riding type sling connection mode, breaks through the technical thinking that the cable clamp adopts a left-right butt joint mode in the conventional riding type sling connection mode, also breaks through the technical inertia thinking that an up-down butt joint type cable clamp is only suitable for pin hinge type sling connection, combines the riding type sling connection mode with the up-down butt joint type cable clamp, and creatively solves the technical problem in the utility model.
2. The stress state of the high-strength bolt is greatly improved. During the service period of the bridge, the sling transmits the load of the vehicle on the bridge floor, and the sling force reduces the axial force in the high-strength bolt, thereby improving the safety of the high-strength bolt.
3. After the half cable clamp body I and the half cable clamp body II are connected, the sling cable and the cable clamp can rotate along with the main cable to form a transverse inclined sling cable.
4. The anti-skid performance of the suspension bridge cable clamp is greatly improved. According to the cable clamp designed according to the scheme of the utility model, with the increase of the tensile force of the sling, the two parts of the cable clamp body are more closely closed, the extrusion stress of the cable clamp on the periphery of the main cable is increased, and the phenomenon of reduction of the extrusion stress at the bottom of the main cable in the conventional cable clamp is avoided. The effect is that the larger the sling tension is, the tighter the cable clamp extrudes the periphery of the main cable, which is not possessed by the prior suspension bridge cable clamp.
5. The cable clamp in the scheme only needs to be cast according to the conventional manufacturing process, only a small amount of materials and processing workload are increased, the existing cable clamp manufacturing process is not changed, the operation is simple, and the manufacture is convenient.
Drawings
FIG. 1 is a schematic side view of the present invention;
FIG. 2 is a schematic side view of the present invention after installation of a sling;
FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;
FIG. 5 is a schematic cross-sectional view taken along line C-C of FIG. 3;
FIG. 6 is a schematic top view of the present invention;
FIG. 7 is a schematic side view of the embodiment 2 after the sling is installed;
FIG. 8 is a schematic vertical sectional view of a clip for a suspension cable according to example 3;
FIG. 9 is a schematic vertical sectional view of the clip of example 4 taken along the curve of the suspension cable;
FIG. 10 is a schematic view showing the distribution angles of the positions of the anchor blocks in the upper and lower butted joint cables;
FIG. 11 is a schematic view showing the distribution angles of the positions of the anchor blocks in the left and right butted clamp cables;
FIG. 12 is a schematic view showing the distribution range of the positions of the first half cable clamp body and the second half cable clamp body at the splicing position;
FIG. 13 is a bottom view of the anchor block of FIG. 3;
FIG. 14 is a second schematic bottom view of the anchor block of FIG. 3;
FIG. 15 is a third schematic bottom view of the anchor block of FIG. 3;
FIG. 16 is a schematic sectional view taken along line A-A of FIG. 2 in accordance with example 5;
FIG. 17 is a schematic sectional view of example 6 taken along line A-A in FIG. 2;
FIG. 18 is a schematic sectional view of example 7 taken along line A-A in FIG. 2;
FIG. 19 is a schematic sectional view of example 8 taken along line A-A in FIG. 2.
In the description of the attached drawings, the number 1 is a half-cable clamp body I, the number 2 is a half-cable clamp body II, the number 3 is a riding groove, the number 4 is a screw rod, the number 5 is a nut, the number 6 is a washer, the number 7 is a positioning groove, the number 8 is an end seam groove, the number 9 is an anchoring block, the number 10 is a convex strip, the number 11 is a sling, the number 12 is a backing plate, the number 13 is an anchor head, the number 14 is a fixing lug, the number 15 is an arc-shaped body, the number 16 is a supporting block, and the number 17 is a pin rod.
The shaded portions in figures 1, 2 and 7 correspond to the outer sides of the raised anchor blocks, and the unshaded portions correspond to the outer sides of the securing ears within the reach of the high-strength bolts of a conventional cable clamp.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the accompanying drawings and the detailed description of the present invention:
example 1
The semi-straddle type cable clamp in the embodiment has a relatively simple connecting structure, and is convenient to manufacture, and the suspension bridge cable clamp is schematically shown in a side view in fig. 1 and 2, and a main cable is not shown in the drawings. The cable clamp is in a Harvard type, the butt joint type of the two parts is up-down butt joint, the half cable clamp body I1 and the half cable clamp body II 2 are matched together up and down, and the end part is provided with an end slot 8. Two ends of the annular outline of the half cable clamp body I1 and the half cable clamp body II 2 are provided with connecting steps, tooth blocks on the connecting steps are mutually meshed, the connecting steps are provided with a plurality of bolt holes which correspond to each other, and the two parts are connected together and clamped on a main cable through a high-strength bolt consisting of a screw rod 4, a nut 5 and a washer 6. The cable clamp is provided with a riding groove 3 for placing a sling 11. The sling 11 is made of a steel wire rope. The lower end of the sling 11 is connected to the bridge floor, the anchor head 13 at the upper end is connected to the connecting structure of the second half cable clamp body 2, and the sling 11 is half-ridden on the cable clamp. For a conventional riding type cable clamp, two sides of the cable clamp which directly bear the pressure of a high-strength bolt are provided with a block, and the outer side surface of the cable clamp is a vertical plane. The unshaded part of the high-strength bolt in the action range of fig. 1 and 2 corresponds to a part of the vertical plane, while the shaded part is a convex block which is more on the side than the conventional cable clamp and is used for supporting a sling 11, namely an anchoring block 9, and a riding groove 3 is formed on the convex block. The connecting structure is positioned on the corresponding anchoring block 9, the positioning groove 7 is arranged on the half rope clamp body 2 above the anchor head 13 of the sling 11, the positioning groove can directly support and position the anchor head 13, and a backing plate 12 can also be arranged above the anchor head 13 as shown in figure 2. The number of the slings 11 on the cable clamp can be odd or even, and finally, only the tension balance of the two sides is achieved, and the anchor heads 13 of the slings 11 are sequentially and respectively positioned on the two sides of the cable clamp along the longitudinal direction of the cable clamp, as shown in fig. 6. The connection mode of the sling 11 on the cable clamp is shown in figure 3, the anchoring block 9 in the embodiment is mainly concentrated on the second half cable clamp body 2, the manufacturing is relatively convenient, but the straddling groove 3 splits the action area of the pressure of the adjacent high-strength bolt, so that the pressure of each high-strength bolt only affects the local area, and the phenomenon mainly occurs on the first half cable clamp body 1. Longitudinal cross-sectional views of the cable clamp at different circumferential positions are shown in fig. 4 and 5, and in order to ensure sufficient wall thickness of the cable clamp, in the top region of the half cable clamp body 1, a protruding strip 10 is provided on both sides for the straddling groove 3, protruding out of the main body of the half cable clamp body 1.
The main feature of this embodiment is that the section of the straddling groove 3 on the anchor head 13 side of the cable clamp is perpendicular to the table surface under the high-strength bolt washer 6, which simplifies the design and facilitates the manufacture. The cable clamp is made of stainless steel, martensite stainless steel or austenite stainless steel can be selected, and the high-strength bolt component is also made of stainless steel, so that the later maintenance cost can be reduced.
Example 2
This example is a modification of example 1, and is shown in fig. 7 in a schematic side view after the sling has been installed. In this embodiment, the simplicity of the manufacturing process is not described too much, and the stress of the sling 11 is focused more, so as to reduce the extrusion degree between the sling 11 and the side wall of the riding groove 3 and reduce the micro-wear of the end of the sling 11. The section of the straddling groove 3 on the side of the anchor head 13 is located at the upper end of the clip with respect to the cross section of the clip passing through the lowest point of the straddling groove 3 at the top of the main cable. Thus, after the sling is installed, the sling 11 segment in the straddling groove 3 is a section of three-dimensional curve distributed in a non-circular shape, and the tangent line of the sling 11 segment is continuous or the transverse curvature is small at the top of the cable clamp, so that the lateral extrusion stress of the sling 11 at the top of the cable clamp can be reduced.
Example 3
This example is a modification of example 1 and is shown schematically in figure 8 in a vertical cross-section of the clip along the curve of the sling. The separation point of the cable clamp and the sling 11 is positioned on the half cable clamp body 1, particularly on the downward convex tooth block of the connecting step, and the separation point is as high as the center of a circle of the cross section of the main cable passing through the separation point. The line D-D in fig. 8 is the horizontal plane passing through the centre of the cross-section of the main cable in the cable clamp, and the point of release of the suspension cable 11 is also on the line D-D. The purpose of this design is to facilitate the calculation of the length of the sling 11 to be made, since the length of the section below the point of detachment is easily calculated, and the design is simply to superimpose this length of the sling 11 on the clip.
Example 4
This example is a modification of example 3 in which the clip is shown in schematic vertical cross-section along the curve of the sling in figure 9. In the half cable clamp body 1, the fixing lug 14 below the sling 11 is thickened, the protruded block is called as a supporting block 16, the straddling groove 3 does not enter the action range of the high-strength bolt pressure of the corresponding conventional cable clamp, namely the inner side of a vertical dotted line in fig. 9, the action area of the adjacent high-strength bolt pressure is not cut, the bending rigidity of the cable clamp is ensured, and the integrity of the cable clamp is improved.
Example 5
This embodiment is a modification of embodiment 1, and referring to fig. 16, the upper end of the sling 11 in this embodiment is not hung on the open hanging lug, but is connected with the insertion lug of the pinhole. In this example the upper end of the sling 11 has an ear plate with a pin hole at the anchor head 13 and the anchor block 9 has two opposed ear plates with pin holes. The ear plates on the anchor head 13 extend into the space between the two ear plates on the anchor block 9, and the pin rods 17 sequentially penetrate through the three pin holes, so that the sling 11 is pinned on the cable clamp.
Example 6
This example is a modification of example 1, see fig. 17. The anchoring block 9 in this embodiment is no longer integrated with the fixing lug 14, the anchoring block 9 is positioned on the outer side wall of the second half-cable clamp body 2, and the upper end of the sling 11 is connected with the inserting lug with the pinhole. In this example the upper end of the sling 11 has an ear plate with a pin hole at the anchor head 13 and the anchor block 9 has two opposed ear plates with pin holes. The ear plates on the anchor head 13 extend into the space between the two ear plates on the anchor block 9, and the pin rods 17 sequentially penetrate through the three pin holes, so that the sling 11 is pinned on the cable clamp.
Example 7
This example is a modification of example 5, see fig. 18. In order to reduce the bending of the sling 11, improve the stress state of the end part of the sling 11 and prolong the service life, an arc-shaped body 15 is adopted to connect the end part of the sling 11 and the anchoring block 9. In this example the upper end of the sling 11 has an ear plate with a pin hole at the anchor head 13 and the anchor block 9 has two opposed ear plates with pin holes. The two ends of the arc-shaped body 15 are provided with ear plates, the upper end of the arc-shaped body is provided with two opposite ear plates, the middle position of the lower end of the arc-shaped body is provided with one ear plate, and the ear plates are provided with pin holes. The ear plate on the anchor head 13 extends into the space between two ear plates at the upper end of the arc-shaped body 15, and a pin rod 17 sequentially penetrates through the three pin holes; one lug plate at the lower end of the arc-shaped body 15 extends into the space between two lug plates on the anchoring block 9 and sequentially passes through the three pin holes by a pin rod 17.
Example 8
This example is a modification of example 1, see fig. 19. The half straddle type cable clamp in the embodiment is in a Harvard type, the butt joint type of the two parts is left-right butt joint, and the half cable clamp body II 2 and the half cable clamp body I1 are matched together left and right. The lower end of a sling 11 is connected to the bridge floor, the sling 11 is half-ridden on a cable clamp, an anchor head 13 at the upper end is connected to an anchor block 9 of the half cable clamp body II 2, the anchor block 9 is located on the lower side of the main cable, and the anchor block 9 and a corresponding fixing lug 14 are integrated. The embodiment has the main characteristics that the advantages of the conventional cable clamp are exerted, the half cable clamp body I1 and the half cable clamp body II 2 are tightly extruded together under the action of the tensile force of all the suspension cables 11 on the cable clamp, the defect that the conventional cable clamp is easy to expand the porosity between steel wires at the bottom of a main cable is avoided, and the larger the tensile force of the suspension cables 11 is, the larger the extrusion stress of the cable clamp on the main cable is, so that the cable clamp can be ensured not to slide.
In summary, the utility model has the following partial technical characteristics that the diverging openings are formed at the end openings of the riding groove at the side where the sling is connected with the main beam, and the swinging amplitude of the sling can be adapted. The riding groove is a curved groove for accommodating and positioning the sling, the positioning groove can stabilize the position of the anchor head as much as possible, and the end seam groove is designed for being matched with and connected with an anti-rust kit, such as a wrapping belt. The anchoring block is a fixed block extending out, and the upper part of the anchoring block is provided with an opening for inserting or penetrating the sling. The convex strip protrudes out of the cable clamp body, and extends outwards to increase the depth of the riding groove under the condition that the standard size of the cable clamp body is not reduced.
The utility model has the conception that the first half cable clamp body and the second half cable clamp body are respectively an upper cable clamp and a lower cable clamp which are butted up and down, and openings at two sides of the straddling groove are respectively and simultaneously positioned on the side wall of the first half cable clamp body, the side wall of the second half cable clamp body or the side walls of the first half cable clamp body and the second half cable clamp body. The riding starting point of the sling is arranged on the outer side wall of one side of the half cable clamp body, the anchoring blocks are arranged on the outer side wall of the other side of the half cable clamp body, the projection angle of the angle range of the anchoring blocks distributed on the outer side wall on the same plane rectangular coordinate system is alpha 0, wherein alpha 0 is more than or equal to 0 degree and is less than or equal to 90 degrees; the starting point of riding of hoist cable is on the lateral wall of half cable clamp one side, and the anchor block is on the downside outer wall of half cable clamp two, and the angle range that the anchor block distributes on the downside outer wall of half cable clamp two is alpha 1 on the rectangular coordinate system of coplanar, and wherein 215 is less than or equal to alpha 1 and is less than or equal to 360. The anchoring block in the structure can be arranged in a region which passes through the riding groove at the highest position of the vertical surface, passes through the lowest position of the cable clamp body all the time, finally falls on a place with a projection angle of 215 degrees on a plane rectangular coordinate system, and does not touch the riding starting point of the sling.
The first half cable clamp body and the second half cable clamp body are respectively a left cable clamp and a right cable clamp which are in left-right butt joint, and openings on two sides of the straddling groove are respectively positioned on the side wall of the first half cable clamp body and the side wall of the second half cable clamp body or respectively positioned on the side wall of the first half cable clamp body and the side wall of the second half cable clamp body. The riding starting point of the sling is arranged on the outer side wall of the first half cable clamp body, the projection angle of the angle range of the anchoring blocks distributed on the outer side wall of the second half cable clamp body on the same plane rectangular coordinate system is alpha 2, wherein alpha 2 is more than or equal to 90 degrees and less than or equal to 0 degrees, and alpha 2 is more than or equal to 270 degrees and less than or equal to 360 degrees; the starting point of riding of hoist cable is on the lateral wall of half cable clamp body one, and the angle range that the anchor block distributes on the lateral wall of half cable clamp body one is alpha 3 on the rectangular coordinate system of coplanar, wherein 215 is less than or equal to alpha 3 and is less than or equal to 270.
The anchoring block in the structure can also be arranged in a region which passes through the riding groove at the highest position of the vertical surface, passes through the lowest position of the cable clamp body all the time, finally falls on a place with a projection angle of 215 degrees on a plane rectangular coordinate system, and does not touch the riding starting point of the sling.
Even when the half cable clamp body I and the half cable clamp body II are jointed together and are operated to rotate at an inclined angle between a plane and a horizontal plane, the winding method is also suitable, namely, the winding method passes through the riding groove at the highest position of the vertical plane, always passes through the lowest position of the cable clamp body, finally falls on a place with a projection angle of 215 degrees on a plane rectangular coordinate system, and does not touch the riding starting point of the sling.
The half cable clamp body I and the half cable clamp body II are spliced and then sleeved on a main cable of the suspension bridge, the rotation inclination angle between the plane where the splicing position is located and the horizontal plane is alpha 4, wherein the alpha 4 is more than or equal to 0 degree and less than or equal to 90 degrees.
In the present application, the positional relationship is relative, and "up" includes right up and oblique up, and "down" includes right down and oblique down; "left" and "right" are also understood similarly. The explanation is also applicable to the situation that the half cable clamp body I and the half cable clamp body II are spliced and then are rotated to be sleeved on the main cable of the suspension bridge.
The scheme is also suitable for the condition that the sling is pulled upwards, for example, the stable rope can be installed for increasing the transverse rigidity or the vertical rigidity of a large-span bridge or a large-span slender structure, the stable rope is protruded upwards under the main structure and under the action of the upward pulling force of the rope, and the similar rope clamp device used at the moment is also contained in the scheme.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.