Pre-tensioning method safety limiting device

Abstract

The utility model discloses a safety limiting device adopting a pre-tensioning method. The safety limiting device comprises finish rolling deformed steel bars, finish rolling nut sets, tensioning stand columns, limiting plates, tensioning movable anchor columns and protective fences. The tensioning stand columns comprise the first stand column and the second stand column which are symmetrically arranged on the two sides of the finish rolling deformed steel bar. The limiting plate is located on the front side of the tensioning stand column, and the two ends are fixedly connected with the first stand column and the second stand column correspondingly. The tension movable anchor column is arranged on the finish rolling deformed steel bar in a sleeving mode and located on the rear side of the tension block. The finish rolling nut group comprises a first finish rolling nut, a second finish rolling nut, a third finish rolling nut and a fourth finish rolling nut which are respectively fixed on the finish rolling deformed steel bar and are arranged at intervals. According to the safety limiting device, through multiple protection of the protective fence, the first finish rolling nut and the second finish rolling nut which are located on the two sides of the limiting plate and the like, when a steel strand is broken in the tensioning process, finish rolling deformed steel bars are prevented from flying out, personnel are prevented from getting close to prevent safety accidents, and potential safety hazards are reduced.

Description

Technical Field

[0001] The embodiments of the utility model belong to the technical field of prestressed concrete construction, and more specifically, relate to a pre-tensioning safety limit device. Background Art

[0002] Pre-tensioning involves tensioning prestressed tendons before pouring concrete. These tendons are temporarily anchored to a pedestal or steel formwork before pouring concrete. Once the concrete has cured to at least 75% of its design strength, ensuring adequate bonding between the tendons and the concrete, the tendons are relaxed. Prestressing is then applied to the concrete through the bond between the concrete and the tendons. Pre-tensioning technology is primarily used in structural projects requiring improved bearing capacity, crack resistance, and durability. It is characterized by simple construction, cost-effectiveness, consistent quality, high production efficiency, and a wide range of applications.

[0003] However, existing technologies for pre-tensioning limiters present significant problems. Specifically, the limiters used in existing technologies are relatively simple, typically limiting only a single, finished nut. This single limiter structure poses significant safety risks, as it may not effectively prevent the finished rebar from flying out due to strand breakage during the tensioning process. If this occurs, the strand breakage releases stress and the rebar could fly backwards, potentially damaging the equipment and posing a serious threat to worker safety.

[0004] Therefore, the main problem of the existing pre-tensioning limit device is that the limit measures are single and lack sufficient safety protection, which makes safety accidents prone to occur. This requires a safer and more reliable limit device to improve the safety of the construction process and reduce potential safety risks. Summary of the Invention

[0005] Aiming at the problems that the limiting device of the pre-tensioning method in the prior art has a single limiting measure, lacks sufficient safety protection, and is prone to safety accidents, the utility model provides a pre-tensioning safety limiting device to solve such problems.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a pre-tensioning safety limit device, including: a tensioning column, which includes a first column and a second column symmetrically arranged on both sides of the fine-rolled threaded steel; a limit plate sleeved on the fine-rolled threaded steel, which is located in front of the tensioning column, and the two ends are fixedly connected to the first column and the second column respectively; a tensioning movable anchor column sleeved on the fine-rolled threaded steel, which is located behind the tensioning block; a guardrail arranged behind the tensioning movable anchor column; and a fine-rolled nut group fixed on the fine-rolled threaded steel, which includes a first fine-rolled nut, a second fine-rolled nut and a fourth fine-rolled nut, wherein the first fine-rolled nut is located in front of the limit plate, the second fine-rolled nut is located behind the limit plate; and the fourth fine-rolled nut is located behind the tensioning movable anchor column.

[0007] Furthermore, it also includes a tensioning block sleeved on the fine-rolled threaded steel bar, which is located on the rear side of the tensioning column, and has two ends fixedly connected to the first column and the second column respectively.

[0008] Furthermore, the finishing nut group also includes a third finishing nut, and the third finishing nut is located between the tensioning block and the tensioning movable anchor column.

[0009] Furthermore, the tensioning columns are fixed in the foundation pit and are made of steel structure box columns.

[0010] Furthermore, the limiting plate is made of high-strength steel plate, and both ends are fixed to the front sides of the first column and the second column respectively by welding or bolting.

[0011] Furthermore, a plurality of first through holes are arranged in an array on the limiting plate, and the diameter of the first through holes is adapted to the diameter of the finished rolled threaded steel bar.

[0012] Furthermore, the tensioning block is made of a steel block, and its two ends are fixed to the rear sides of the first column and the second column respectively by welding or bolting. A plurality of second through holes are arranged in an array, and the diameter of the second through holes is adapted to the diameter of the finished rolled threaded steel bar.

[0013] Furthermore, the bottom of the guardrail is fixed to the ground by anchor bolts.

[0014] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0015] (1) The limiting device of the present invention is provided with a limiting plate, a tensioning block and a guardrail, and the first, second, third and fourth precision-rolled nuts are spaced apart to form a four-fold limiting structure, thereby providing more stable protection. The multiple protection design significantly reduces the safety risks during the construction process and improves the construction safety. During the tensioning process, even if the steel strand breaks, the precision-rolled threaded steel will eliminate kinetic energy under the obstruction of the four-fold limiting structure and will not fly out, thereby effectively preventing equipment damage and personal injury.

[0016] (2) The limit device of the utility model is a tensioning movable anchor column that cooperates with the tensioning column. Under the action of the tensioning device, the fine-rolled threaded steel bar is pushed backward, thereby tensioning the steel strand fixedly connected to the front end of the fine-rolled threaded steel bar. The operation is simple and easy for construction workers to understand and execute.

[0017] (3) The limit device of the utility model is characterized in that the tensioning column can be lifted and removed from the foundation pit after the pre-tensioning construction is completed, and the construction can be carried out multiple times. The bottom of the guardrail is fixed to the ground by anchor bolts and can be disassembled. The above arrangement makes the limit device reusable, thereby improving the efficiency and economy of the equipment.

[0018] (4) The multiple limiting structures designed in the limiting device of the utility model ensure the stability and quality during the construction process and reduce the construction interruption caused by equipment failure. The device is not only suitable for prestressed concrete construction, but can also be used in other structural projects that require improvement in the bearing capacity, crack resistance and durability of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a pre-tensioning safety limit device according to an embodiment of the present utility model;

[0020] Figure 2 This is a rear view of the tensioning column in the embodiment of the present utility model;

[0021] Figure 3 It is a front view of the tensioning column in the embodiment of the present utility model.

[0022] In all the drawings, the same figure marks represent the same technical features, specifically: 1-fine-rolled rebar, 2-fine-rolled nut group, 201-first fine-rolled nut, 202-second fine-rolled nut, 203-third fine-rolled nut, 204-fourth fine-rolled nut, 3-tensioning column, 301-first column, 302-second column, 4-limiting plate, 5-tensioning block, 6-tensioning movable anchor column, 7-guardrail, 8-inclined support column. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0024] like Figure 1-3 As shown, the utility model provides a pre-tensioning safety limit device, including a fine-rolled threaded steel bar 1, a fine-rolled nut group 2, a tensioning column 3, a limit plate 4, a tensioning block 5, a tensioning movable anchor column 6 and a guardrail 7. The front end of the fine-rolled threaded steel bar 1 is fixedly connected to the steel strand, driving the steel strand to align and apply prestress for tensioning. After the steel strand breaks, the stress is released and it flies out to the rear. The tensioning column 3 includes a first column 301 and a second column 302 symmetrically arranged on both sides of the fine-rolled threaded steel bar 1. The limit plate 4 is sleeved on the fine-rolled threaded steel bar 1, which is located on the front side of the tensioning column 3, and its two ends are respectively fixedly connected to the first column 301 and the second column 302; the tensioning block 5 is sleeved on the fine-rolled threaded steel bar 1, which is located on the rear side of the tensioning column 3, and its two ends are respectively fixedly connected to the first column 301 and the second column 302. The tensioning movable anchor column 6 is sleeved on the fine-rolled threaded steel bar 1, which is located on the rear side of the tensioning block 5. The finishing nut group 2 includes a first finishing nut 201, a second finishing nut 202, a third finishing nut 203 and a fourth finishing nut 204 respectively fixed on the finishing threaded steel bar 1, wherein the first finishing nut 201 is located in front of the limit plate 4, the second finishing nut 202 is located between the limit plate 4 and the tensioning block 5; the third finishing nut 203 is located between the tensioning block 5 and the tensioning movable anchor column 6; the fourth finishing nut 204 is located behind the tensioning movable anchor column 6. The safety limiting device of the utility model is provided with a guardrail 7 and multiple protections such as the first finishing nut 201 and the second finishing nut 202 located on both sides of the limit plate 4. When the steel strand breaks during the tensioning process, it prevents the finishing threaded steel bar 1 from flying backwards, prevents people from approaching to prevent safety accidents, and reduces safety hazards.

[0025] like Figure 1As shown, the tensioning column 3 is fixed in the foundation pit and is made of a steel box column. It can be lifted and removed from the foundation pit after the pre-tensioning construction is completed, and can be used for multiple pre-tensioning constructions. The tensioning column 3 includes a first column 301 and a second column 302. The first column 301 and the second column 302 are spaced apart, and a gap is left between them for passing the fine-rolled threaded steel bar 1. Preferably, the front side of the tensioning column 3 is fixedly connected to the top of the inclined support column 8, and the other end of the inclined support column 8 is fixedly connected to the top. By providing the inclined support column 8, the structural strength of the tensioning column 3 is enhanced, so that it can resist the forward force of the tensioning device during the tensioning operation.

[0026] The limit plate 4 is used to prevent the fine-rolled threaded steel 1 from flying outward after the steel strand breaks. It is made of high-strength steel plate, and its two ends are fixed to the front side of the first column 301 and the second column 302 respectively by welding or bolting. Furthermore, a plurality of first through holes are arranged in an array on the limit plate 4. The diameter of the first through hole is adapted to the diameter of the fine-rolled threaded steel 1, and can allow the fine-rolled threaded steel 1 to pass through. When preventing the fine-rolled threaded steel from flying outward, the fine-rolled threaded steel is subjected to a backward pulling force and moves successively until the first fine-rolled nut 201 contacts the front side of the limit plate 4, preventing the broken fine-rolled threaded steel from moving backward. During the collision and rebound of the first fine-rolled nut 201 and the limit plate 4, the second fine-rolled nut 202 contacts the back side of the limit plate 4, preventing the fine-rolled threaded steel from flying forward, thereby performing a limit blocking operation to protect the construction workers.

[0027] The tensioning block 5 is used to radially limit the multiple finished threaded steel bars 1 during tensioning, preventing them from being offset by force. It is made of a steel block, with its ends fixed to the rear sides of the first column 301 and the second column 302 respectively by welding or bolting. Furthermore, the limiting plate 4 is provided with a plurality of second through-holes in an array, the diameter of which matches the diameter of the finished threaded steel bars 1, allowing them to pass through and simultaneously limiting their radial position. When the finished threaded steel bars are prevented from flying backwards, the second finished nut 202 collides with the front side of the tensioning block 5 to limit their position, preventing the broken finished threaded steel bars from flying backwards.

[0028] The tensioning movable anchor column 6 cooperates with the tensioning column 3 to tension the fine-rolled threaded steel 1. A plurality of corresponding third through holes are provided on the anchor column 6. The diameter of the third through hole is adapted to the diameter of the fine-rolled threaded steel 1, and the fine-rolled threaded steel 1 can pass through. At the same time, the fine-rolled threaded steel 1 is radially limited, and its rear side is in conflict with the fourth fine-rolled nut 204. When performing the tensioning operation, the tensioning device (such as a jack) is fixed to the rear side of the tensioning column 3 so that the ends of the tensioning device piston rod respectively conflict with the front side of the tensioning movable anchor column 6, and the tensioning movable anchor column 6 is pushed to move backward, and the fourth fine-rolled nut 204 conflicts with the tensioning movable anchor column 6, and the first fine-rolled nut 201 moves backward to conflict with the front side of the limit plate 4, thereby simultaneously applying prestress to multiple pairs of fine-rolled threaded steels 1 for tensioning.

[0029] Preferably, a copper bushing is detachably provided in the first through hole, the second through hole and the third through hole, which can contact and rub with the outer periphery of the fine-rolled threaded steel 1. Its hardness is softer than that of the fine-rolled threaded steel 1, preventing the fine-rolled threaded steel 1 from being worn and affecting the tensioning effect, and avoiding damage to the limit plate 4, the tensioning block 5, and the tensioning movable anchor column 6 when the fine-rolled threaded steel 1 is displaced, thereby extending the service life of the device.

[0030] The guardrail 7 is arranged at the rear side of the tensioning movable anchor column 6, and its bottom is fixed to the ground by anchor bolts, which can block the four precision-rolled nuts 204 and prevent the precision-rolled threaded steel bars from flying out backwards.

[0031] The limiting device of the present invention is provided with a limiting plate 4, a tensioning block 5 and a guardrail 7, and the first finished rolled nut 201, the second finished rolled nut 202, the third finished rolled nut 203 and the fourth finished rolled nut 204 are arranged at intervals to form a four-fold limiting structure to provide more stable protection; the multiple protection design significantly reduces the safety risks during the construction process and improves the construction safety. During the tensioning process, even if the steel strand breaks, the finished rolled threaded steel 1 will eliminate kinetic energy under the obstruction of the four-fold limiting structure and will not fly out, thereby effectively preventing equipment damage and personal injury.

[0032] The limiting device of the utility model, the tensioning movable anchor column 6 cooperates with the tensioning column 3, and pushes the fine-rolled threaded steel bar 1 backward under the action of the tensioning device, thereby tensioning the steel strand fixedly connected to the front end of the fine-rolled threaded steel bar 1. The operation is simple and easy for construction personnel to understand and execute.

[0033] According to the limiting device of the present invention, the tensioning column 3 can be lifted and removed from the foundation pit after the pre-tensioning construction is completed, and construction can be carried out multiple times. The bottom of the guardrail 7 is fixed to the ground by anchor bolts and can be disassembled. The above arrangement makes the limiting device reusable, thereby improving the efficiency and economy of the equipment.

[0034] The limiting device of the utility model is designed with multiple limiting structures to ensure stability and quality during the construction process and reduce construction interruptions caused by equipment failure. The device is not only suitable for prestressed concrete construction, but can also be used in other structural projects that require improved component bearing capacity, crack resistance and durability.

[0035] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 pre-tensioning safety limit device, characterized in that: include: A tensioning column (3) comprising a first column (301) and a second column (302) symmetrically arranged on both sides of the finished rolled threaded steel bar (1); A limit plate (4) sleeved on the fine-rolled threaded steel bar (1) is located in front of the tensioning column (3), and its two ends are fixedly connected to the first column (301) and the second column (302) respectively; A tensioning movable anchor column (6) sleeved on the fine-rolled threaded steel bar (1) is located at the rear side of the tensioning block (5); A guardrail (7) provided on the rear side of the tensioning movable anchor column (6); And a finishing nut group (2) fixed on the finishing threaded steel (1), comprising a first finishing nut (201), a second finishing nut (202) and a fourth finishing nut (204), wherein the first finishing nut (201) is located in front of a limit plate (4), the second finishing nut (202) is located behind the limit plate (4); and the fourth finishing nut (204) is located behind a tensioning movable anchor column (6).

2. A pre-tensioning safety limit device according to claim 1, characterized in that: It also includes a tensioning block (5) sleeved on the fine-rolled threaded steel bar (1), which is located at the rear side of the tensioning column (3), and has two ends fixedly connected to the first column (301) and the second column (302) respectively.

3. A pre-tensioning safety limit device according to claim 2, characterized in that: The finishing nut group (2) further comprises a third finishing nut (203), and the third finishing nut (203) is located between the tensioning block (5) and the tensioning movable anchor column (6).

4. A pre-tensioning safety limit device according to any one of claims 1 to 3, characterized in that: The tensioning columns (3) are fixedly arranged in the foundation pit and are made of steel structure box columns.

5. A pre-tensioning safety limit device according to any one of claims 1 to 3, characterized in that: The limiting plate (4) is made of high-strength steel plate, and its two ends are respectively fixed to the front sides of the first column (301) and the second column (302) by welding or bolt fixing.

6. A pre-tensioning safety limit device according to any one of claims 1-3, characterized in that: The limiting plate (4) is provided with a plurality of first through holes in an array, and the diameter of the first through holes is adapted to the diameter of the finished rolled threaded steel bar (1).

7. A pre-tensioning safety limit device according to claim 2, characterized in that: The tensioning block (5) is made of a steel block, and its two ends are fixed to the rear sides of the first column (301) and the second column (302) respectively by welding or bolting. A plurality of second through holes are arranged in an array, and the diameter of the second through holes is adapted to the diameter of the finished rolled threaded steel bar (1).

8. A pre-tensioning safety limit device according to any one of claims 1 to 3, characterized in that: The bottom of the guardrail (7) is fixed to the ground via anchor bolts.

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