A hoop

Abstract

The present invention provides a clamp comprising an annular tensioning inner sleeve, an annular housing outer sleeve, and a locking device; the outer surface of the annular housing outer sleeve is provided with outwardly protruding ribs in the axial direction, and the ribs are provided with through grooves extending through the housing outer sleeve on both sides; the annular tensioning inner sleeve is formed by surrounding one or more elastic sheets, and the elastic sheets connected to each other are provided with outwardly protruding ears at the connection points; the outwardly protruding ears at the connection points of the elastic sheets respectively pass through the through grooves on both sides of the ribs of the housing outer sleeve; the ears of the elastic sheets of the tensioning inner sleeve and the ribs of the housing outer sleeve are provided with corresponding connecting holes, and the locking device connects the tensioning inner sleeve and the housing outer sleeve through the connecting holes of the ears of the elastic sheets of the tensioning inner sleeve and the ribs of the housing outer sleeve. The clamp of the present invention can be automatically tightened or loosened by controlling the locking cylinder of the locking device.

Description

Technical Field

[0001] The invention relates to the technical field of building bridge construction, in particular to a hoop for the construction of a cylindrical pier type bridge. Background Art

[0002] In bridge design, column-type piers are a commonly used structural type. For simply supported bridges, the cap beam is a crucial link between the upper and lower structures. It transmits the load of the superstructure to the substructure and foundation through the cap beam, making it one of the primary load-bearing structures. The cap beam, also known as the cap beam, is a horizontal beam installed at the top of the bent pile pier to support, distribute, and transmit the load of the superstructure.

[0003] The most commonly used construction method before pouring the cap beam of a bridge pier is to use the hoop method to construct the cap beam. The process of using the hoop method to construct the cap beam is usually as follows:

[0004] Two clamps are installed at appropriate locations on the cylindrical piers as support devices. The upper clamp serves as the primary load-bearing clamp, while the lower clamp acts as a safety feature. A jack is placed between the two clamps to adjust the clamp spacing. Marks are made on the top of the clamps, and then a professional installs the clamps using a torque wrench (the clamp installer must climb up and down the pier using a ladder). After the clamps are installed and tightened, the load-bearing crossbeam (also known as the main beam), distribution beam, cap beam bottom formwork, cap beam construction work platform, cap beam side formwork, and steel frame are erected on top of the upper clamps. The cap beam is then cast.

[0005] like Figures 1 to 3 As described above, the clamp in the prior art is usually composed of two semicircular arc plates 01 connected by bolts 02. The bolts 02 are high-strength bolts, and a torque wrench is used to accurately apply torque during construction.

[0006] The existing clamp has the following three disadvantages:

[0007] 1. When the clamp is fixed on the bridge pier, it is a high-altitude operation, and professionals are required to manually tighten the bolts at a high altitude on the top of the pier. The clamp installers must climb up and down the pier using a ladder. At the beginning, there is no support system and working platform on the top of the pier, and the operation has safety hazards.

[0008] Second, in order to prevent the pier column concrete from being damaged during installation of the clamp and to increase the friction between the clamp and the pier column, it is necessary to add a layer of rubber pad or geotextile between the clamp and the pier column, which is cumbersome.

[0009] 3. When removing the clamp, the operator needs to remove it at the top of the pier. The high-altitude operation is risky and inefficient. Summary of the Invention

[0010] In order to solve the problems in the prior art, the present invention provides a clamp which has a compact structure, is safe and reliable, is easy to operate, and is convenient for locking or loosening the clamp.

[0011] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a clamp includes an annular tensioning inner sleeve, an annular box outer sleeve, and a locking device; the outer surface of the annular box outer sleeve is axially provided with outwardly protruding ribs, and through grooves penetrating the box outer sleeve are provided on both sides of the ribs; the annular tensioning inner sleeve is surrounded by more than one elastic sheet, and the elastic sheets connected to each other are provided with outwardly turned ears at the connection points; the outwardly turned ears at the connection points of the elastic sheets pass through the through grooves on both sides of the ribs of the box outer sleeve respectively; the ears of the elastic sheet of the tensioning inner sleeve and the ribs of the box outer sleeve are provided with corresponding connecting holes, and the locking device connects the tensioning inner sleeve with the box outer sleeve through the connecting holes of the ears of the elastic sheet of the tensioning inner sleeve and the ribs of the box outer sleeve.

[0012] According to a preferred technical solution, the clamp further comprises a load-bearing platform.

[0013] According to a preferred technical solution, the load-bearing platform of the clamp is an outward-turned platform arranged at the upper end of the annular box outer shell.

[0014] According to a preferred technical solution, the outer surface of the annular housing outer shell is provided with a plurality of outwardly protruding ribs in the axial direction, and the plurality of ribs are evenly distributed on the outer surface of the annular housing.

[0015] According to a preferred technical solution, a rubber pad is embedded in the inner wall of the tensioning inner sleeve.

[0016] The preferred technical solution is that the locking device includes a cam, a locking cylinder for driving the cam to rotate, a top plate, a pull rod, and a spring assembly; one end of the spring assembly is connected to one side of the tensioning inner sleeve, and the other end of the spring assembly is connected to the other side of the tensioning inner sleeve; one end of the pull rod is movably connected to one side of the tensioning inner sleeve, and the other end of the pull rod is fixedly connected to the other side of the tensioning inner sleeve; the top plate is sleeved on one end of the pull rod, and one end of the pull rod is provided with a stop portion for limiting the displacement of the top plate; the cam is located between the top plate and one side of the tensioning inner sleeve, and is against the top plate; the locking cylinder can drive the cam to rotate, and by changing the distance between the top plate and one side of the tensioning inner sleeve, the one side of the tensioning inner sleeve is moved close to or away from the other side of the tensioning inner sleeve, thereby tightening or loosening the spring assembly, and allowing the tensioning inner sleeve to be locked or loosened.

[0017] The preferred technical solution is that the locking device includes a box body, a cam, a locking oil cylinder for driving the cam to rotate, a first top plate, a second top plate, a pull rod, and a spring assembly; the box body is fixed on the outer sleeve of the box body, the cylinder end of the locking oil cylinder is connected to the box body through an ear plate, and the piston end of the locking oil cylinder is connected to the cam; one end of the pull rod is movably connected to one side of the tensioning inner sleeve, and the other end of the pull rod is fixedly connected to the other side of the tensioning inner sleeve; the first top plate is sleeved on one end of the pull rod, and one end of the pull rod is provided with a stop portion that limits the displacement of the first top plate; the cam is located between the first top plate and the second top plate, and is against the first top plate and the second top plate; the second top plate also is against one side of the tensioning inner sleeve; the locking oil cylinder can drive the cam to rotate, and by changing the distance between the first top plate and the second top plate, the second top plate drives one side of the tensioning inner sleeve to approach or move away from the other side of the tensioning inner sleeve, compressing or loosening the spring assembly, so that the tensioning inner sleeve is locked or loosened.

[0018] According to a preferred technical solution, the spring assembly includes a spring barrel, a spring, and a spring shaft; the spring is sleeved on the spring shaft and is located inside the spring barrel.

[0019] In a preferred technical solution, the spring is a compression spring.

[0020] The preferred technical solution is that the locking device includes a box body, a cam, a locking oil cylinder for driving the cam to rotate, a first top plate, a second top plate, a pull rod, and a spring assembly; the box body is fixed to the outer shell of the box body, the cylinder end of the locking oil cylinder is connected to the box body through an ear plate, and the piston end of the locking oil cylinder is connected to the cam; the spring assembly and the pull rod respectively pass through the connecting holes of the ear piece of the elastic piece at the connection of the tensioning inner sleeve and the rib of the outer shell of the box body to connect the tensioning inner sleeve with the outer shell of the box body, one of the ear pieces of the elastic piece at the connection of the tensioning inner sleeve is movably sleeved on one end of the pull rod, and the other ear piece of the elastic piece at the connection of the tensioning inner sleeve is sleeved on the pull rod The other end of the rod; the first top plate and the second top plate are both mounted on the pull rod, one side of the first top plate is against the stop portion provided on the pull rod, and the other side of the first top plate is against the cam; one side of the second top plate is against the cam, and the other side of the second top plate is against the elastic sheet movably mounted on the pull rod at the connection between the tensioning inner sleeve; the locking cylinder can drive the cam to rotate, and by changing the distance between the first top plate and the second top plate, the second top plate drives the elastic sheet on one side of the rib at the connection between the tensioning inner sleeve to approach or move away from the elastic sheet on the other side of the rib, thereby tightening or loosening the spring assembly, so that the tensioning inner sleeve is locked or loosened.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The clamp structure of the present invention is compact, safe, reliable and easy to operate.

[0023] 2. The clamp of the present invention has an easy-to-operate locking device, which is relatively reliable and convenient to operate when locking or loosening.

[0024] 3. The friction between the tensioning inner sleeve and the clamped part (for example, in the construction application of the cap beam of a pier-type bridge, the clamped part is the bridge pier) of the present invention is transmitted to the outer shell of the box body through the spring assembly and the pull rod of the locking device. There is no relative movement between the outer shell of the box body and the load thereon. When operating the tensioning and loosening, the load is stable and there is no shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a top view schematic diagram of a clamp in the prior art.

[0026] Figure 2 It is a schematic diagram of the main view of the clamp in the prior art.

[0027] Figure 3 It is a side view schematic diagram of a clamp in the prior art.

[0028] Figure 4 It is a schematic diagram of the overall structure of the clamp of the present invention.

[0029] Figure 5 It is a schematic diagram of the explosion structure of the clamp of the present invention.

[0030] Figure 6 It is a structural schematic diagram of the locking device of the clamp of the present invention.

[0031] Figure 7 This is a schematic cross-sectional view of the locking device of the clamp of the present invention.

[0032] The following are marked in the figure:

[0033] 01-arc plate; 02-bolt; 3-clamp; 4-locking device; 43-housing; 44-cam; 45-locking cylinder; 46-first top plate; 47-second top plate; 48-pull rod; 49-stopper; 5-tensioning inner sleeve; 51-elastic sheet; 52-ear sheet; 53-rubber pad; 6-housing outer sleeve; 61-platform; 62-rib; 63-through groove; 7-spring assembly; 71-spring cylinder; 72-spring; 73-spring shaft; 8-ear plate. DETAILED DESCRIPTION

[0034] Reference Figures 4 to 7 An embodiment of a clamp of the present invention is further described.

[0035] A clamp 3 includes an annular tensioning inner sleeve 5 and an annular box outer sleeve 6. In order to further enhance the friction between the clamp 3 and the clamped part, the inner wall of the tensioning inner sleeve 5 of the clamp 3 in this embodiment is further provided with a rubber pad 53.

[0036] The annular outer shell 6 is provided with an outward-folding platform 61 at its upper end for carrying loads (when the clamp of the present invention is used in cap beam construction, this outward-folding platform can be used to support the temporary support system for the cap beam, including the support clamp, 100-ton jack, main beam, distribution beam, cap beam bottom formwork, and cap beam construction work platform, used in prior art cap beam construction using the clamp method). The outer surface of the annular outer shell 6 is provided with outwardly protruding ribs 62 in the axial direction, and the ribs 62 are flanked by through-slots 63 extending through the outer shell. The annular tensioning inner sleeve 5 is formed by surrounding a single elastic sheet 51 made of elastically deformable metal. In this embodiment, the tensioning inner sleeve 5 is formed by surrounding two elastic sheets 51 made of elastically deformable metal. The two elastic sheets 51 are each provided with an outward-folding tab 52 at the junction. The outward-folding tabs 52 at the junction extend out of the outer shell 6 through through-slots 63 located on either side of the rib 62 of the outer shell 6. The ear piece 52 of the elastic piece of the tensioning inner sleeve and the rib 62 of the outer casing are both provided with corresponding connecting holes.

[0037] The locking device 4 includes a housing 43, a cam 44, a locking cylinder 45 that drives the cam, a first top plate 46, a second top plate 47, a pull rod 48, and a spring assembly 7. The cylinder end of the locking cylinder 45 is connected to the housing 43 via an ear plate 8, and the piston end of the locking cylinder 45 is connected to the cam 44. The spring assembly 7 includes a spring barrel 71, a spring 72, and a spring shaft 73. The spring 72 is mounted on the spring shaft 73 and positioned within the spring barrel 71. The spring 72 is a compression spring, but it can also be other conventional elastic elements similar to compression springs. The housing 43 is fixed to the housing outer sleeve 6 of the clamp 3. The spring assembly 7 and the pull rod 48 respectively pass through the connecting holes between the ear piece 52 of the two elastic sheets at the junction of the tensioning inner sleeve 5 and the rib 62 of the housing outer sleeve, thereby connecting the tensioning inner sleeve 5 of the clamp 3 to the housing outer sleeve 6. The first top plate 46 and the second top plate 47 are both mounted on the pull rod 48. One side of the first top plate 46 abuts against the stopper 49 provided on the pull rod 48, and the other side of the first top plate 46 abuts against the cam 44. One side of the second top plate 47 abuts against the cam 44, and the other side of the second top plate 47 abuts against the ear 52 of one of the two elastic sheets 51 at the junction of the tensioning inner sleeve 5. The elastic sheet 51 is movably mounted on the pull rod 48.

[0038] The locking device 4 locks or releases the clamp 3 in the following manner: When the locking cylinder 45 rotates the cam 44, increasing the distance between the first top plate 46 and the second top plate 47, the first top plate 46 abuts against the stop 49 on the pull rod 48, preventing it from moving toward the stop 49. Consequently, the reaction force pushes the second top plate 47, driving the elastic piece 51 of the tensioning inner sleeve 5, which is abutting against the second top plate 47, toward the other elastic piece 51. This reduces the gap between the elastic pieces 51 of the tensioning inner sleeve 5 of the clamp 3, thereby tightening the tensioning inner sleeve 5 of the clamp 3. Simultaneously, the clamping force of the tensioning inner sleeve 5 is transmitted to the outer casing 6 via the spring assembly 7, the pull rod 48, and the ribs 62 of the outer casing 6, allowing the clamp 3, formed by the tensioning inner sleeve 5 and the outer casing 6, to form a tightly closed whole.

[0039] When the locking cylinder 45 drives the cam 44 to rotate, so that the distance between the first top plate 46 and the second top plate 47 is reduced, the second top plate 47 no longer applies a thrust to the elastic sheet 51 of the tensioning inner sleeve 5 that is against the second top plate 47. Under the action of the spring assembly 7 and its own elastic deformation recovery force, the elastic sheet 51 of the tensioning inner sleeve 5 of the clamp increases the gap at the connection between the elastic sheet 51 and the elastic sheet 51, thereby loosening the tensioning inner sleeve 5 of the clamp 3, and then loosening the clamp 3 composed of the tensioning inner sleeve 5 and the box outer sleeve 6.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A clamp, characterized in that: It comprises an annular tensioning inner sleeve, an annular box outer sleeve, and a locking device; the outer surface of the annular box outer sleeve is axially provided with outwardly protruding ribs, and through grooves penetrating the box outer sleeve are provided on both sides of the ribs; the annular tensioning inner sleeve is surrounded by more than one elastic sheet, and the elastic sheets connected to each other are provided with outwardly turned ears at the connection points; the outwardly turned ears at the connection points of the elastic sheets pass through the through grooves on both sides of the ribs of the box outer sleeve respectively; the ears of the elastic sheets of the tensioning inner sleeve and the ribs of the box outer sleeve are provided with corresponding connecting holes, and the locking device passes through the connecting holes of the ears of the elastic sheets of the tensioning inner sleeve and the ribs of the box outer sleeve to connect the tensioning inner sleeve and the box outer sleeve together; The locking device includes a box body, a cam, a locking cylinder for driving the cam to rotate, a first top plate, a second top plate, a pull rod, and a spring assembly; the box body is fixed to the box body outer shell, the cylinder end of the locking cylinder is connected to the box body through an ear plate, and the piston end of the locking cylinder is connected to the cam; the spring assembly and the pull rod respectively pass through the connecting holes of the ear piece of the elastic piece at the connection of the tensioning inner sleeve and the rib of the box body outer shell to connect the tensioning inner sleeve with the box body outer shell, one of the ear pieces of the elastic piece at the connection of the tensioning inner sleeve is movably sleeved on one end of the pull rod, and the other ear piece of the elastic piece at the connection of the tensioning inner sleeve is sleeved on the other end of the pull rod ; The first top plate and the second top plate are both sleeved on the pull rod, one side of the first top plate is against the stop portion provided on the pull rod, and the other side of the first top plate is against the cam; one side of the second top plate is against the cam, and the other side of the second top plate is against the elastic sheet movably sleeved on the pull rod at the connection between the tensioning inner sleeve; the locking cylinder can drive the cam to rotate, and by changing the distance between the first top plate and the second top plate, the second top plate drives the elastic sheet on one side of the rib at the connection between the tensioning inner sleeve to move closer to or away from the elastic sheet on the other side of the rib, thereby tightening or loosening the spring assembly, so that the tensioning inner sleeve is locked or loosened; The hoop also has a platform for bearing loads.

2. The clamp according to claim 1, characterized in that: The clamp has a load-bearing platform, which is an outward-turned platform arranged on the upper end of the annular box outer shell.

3. The clamp according to claim 1, characterized in that: The outer surface of the annular box outer shell is axially provided with a plurality of outwardly protruding ribs, and the plurality of ribs are evenly distributed on the outer surface of the annular box.

4. The clamp according to claim 1, characterized in that: The inner wall of the tensioning inner sleeve is embedded with a rubber pad.

5. The clamp according to claim 1, characterized in that: The spring assembly comprises a spring barrel, a spring, and a spring shaft; the spring is sleeved on the spring shaft and is located in the spring barrel.

6. The clamp according to claim 5, characterized in that: The spring is a compression spring.

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