Integral tensioning device and integral tensioning method thereof

Abstract

The application discloses a kind of integral tensioning devices.The integral tensioning device includes pre-tightening unit and the integral tensioning unit connected with the pre-tightening unit;The pre-tightening unit includes pre-tightening cylinder body, front end cover, rear end cover, pre-tightening piston, first sealing element and second sealing element;The integral tensioning unit includes front clamping type tensioning jack, first guide sleeve, first tool clamping piece, second guide sleeve and second tool clamping piece.The application also discloses a kind of integral tensioning method.The application provides a kind of integral tensioning device and its integral tensioning method, can be pre-tightened to each single steel strand, makes the initial stress of each single steel strand keep uniform, guarantees the prestressed tensioning quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the prestressed construction technical field, specifically, relates to a whole tensioning device and a whole tensioning method thereof. BACKGROUND

[0002] At present, intelligent tensioning systems are largely used in prestressed tensioning. Most of the jacks in the intelligent tensioning systems are in the form of whole tensioning, each jack contains a set of working anchors and a set of tool anchors, the tool anchors are used to anchor all the steel strands to be tensioned before tensioning, and then the tensioning is released. These jacks are all tensioned in bundles, and the single steel strands are not tensioned, and the tension of each single steel strand is not adjusted, which may cause uneven force on each steel strand and affect the quality of prestressed tensioning. SUMMARY

[0003] In order to solve the technical problems that the existing intelligent tensioning system does not tension the single steel strands and does not adjust the tension of each single steel strand, the present application provides a whole tensioning device and a whole tensioning method thereof, which can pre-tighten each single steel strand to keep the initial stress of each single steel strand uniform and ensure the quality of prestressed tensioning.

[0004] The present application provides a whole tensioning device, which comprises a pre-tightening unit and a whole tensioning unit connected with the pre-tightening unit.

[0005] The pre-tightening unit comprises a pre-tightening cylinder body, a front end cover, a rear end cover, pre-tightening pistons, a first sealing member and a second sealing member, the front end cover and the rear end cover are respectively arranged at both ends of the pre-tightening cylinder body, the pre-tightening pistons are arranged in parallel in the pre-tightening cylinder body, and both ends of each pre-tightening piston pass through the front end cover and the rear end cover, the first sealing member is arranged at the middle part of each pre-tightening piston, and the whole pre-tightening unit is divided into independent sealed tension cavities and sealed return cavities, the sealed tension cavities of all the pre-tightening pistons are connected with each other, the sealed return cavities of all the pre-tightening pistons are connected with each other, and the second sealing member is arranged at one end of each pre-tightening piston close to the whole tensioning unit.

[0006] The whole tension unit comprises a front clamping tension jack, a first guide sleeve, a first tool clamp, a second guide sleeve and a second tool clamp, the front clamping tension jack comprises a jack cylinder, a piston and a limiting plate, one end of the jack cylinder is connected with the rear end cover and is provided with a through hole for the pre-tightening piston to pass through, the limiting plate is arranged at one end of the jack cylinder away from the pre-tightening unit, the piston is a hollow structure, and one end of the piston passes through the limiting plate; the first guide sleeve, the first tool clamp, the second guide sleeve and the second tool clamp are arranged in the piston respectively; the first guide sleeves are arranged in parallel and are fixedly connected with the inner walls of the piston respectively; the first tool clamps are arranged at one end of the first guide sleeves close to the pre-tightening unit; the second guide sleeves are arranged in parallel, one end of the second guide sleeves close to the first guide sleeves is provided with the second tool clamps, and the other end of the second guide sleeves passes through the limiting plate; and the pre-tightening piston, the first guide sleeves and the second guide sleeves are arranged in one-to-one correspondence.

[0007] In a preferred embodiment of the whole tension device provided by the application, the pre-tightening unit further comprises a pre-tightening cylinder oil inlet and a pre-tightening cylinder oil outlet, the pre-tightening cylinder oil inlet communicates with the sealed tension cavity, and the pre-tightening cylinder oil outlet communicates with the sealed return cavity.

[0008] In a preferred embodiment of the whole tension device provided by the application, a displacement measurement unit is further arranged on the outside of the front clamping tension jack.

[0009] The application further provides a whole tension method, comprising the following steps:

[0010] Step one, the steel strands to be tensioned are sequentially arranged through the second guide sleeve, the second tool clamp, the first guide sleeve, the first tool clamp and the pre-tightening piston respectively;

[0011] Step two, the pre-tightening unit pre-tightens the steel strands to be tensioned;

[0012] Step three, the whole tension unit tension the pre-tightened steel strands;

[0013] Step four, after the tensioning and pressure maintaining are completed, slow unloading is performed, and after the unloading is completed, the whole tension device is removed.

[0014] Compared with the prior art, the whole tension device and the whole tension method provided by the application have the following beneficial effects:

[0015] I. By arranging the pre-tightening unit and the whole tension unit, each single steel strand can be pre-tightened, so that the initial stress of each single steel strand is kept uniform, and the pre-stress tensioning quality is ensured.

[0016] II. By arranging the first guide sleeve, the first tool clamp, the second guide sleeve and the second tool clamp in the front clamping tensioning jack, the length of the reserved steel strand can be greatly reduced, material loss is reduced, and the construction cost of the enterprise is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0018] Figure 1 is a structural schematic diagram of the overall tensioning device provided by the present application;

[0019] Figure 2 is a flow chart of the overall tensioning method provided by the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of the overall tensioning device provided by the present application. The overall tensioning device 1 comprises a pre-tightening unit 11 and an overall tensioning unit 12 connected with the pre-tightening unit 11.

[0022] The pre-tightening unit 11 comprises a pre-tightening cylinder body 111, a front end cover 112, a rear end cover 113, pre-tightening pistons 114, a first sealing member 115 and a second sealing member 116. The front end cover 112 and the rear end cover 113 are respectively arranged at two ends of the pre-tightening cylinder body 111. The pre-tightening pistons 114 are arranged in parallel in the pre-tightening cylinder body 111, and the two ends of each pre-tightening piston 114 respectively pass through the front end cover 112 and the rear end cover 113. The first sealing member 115 is arranged at the middle part of each pre-tightening piston 114, so as to divide the whole pre-tightening unit 11 into independent sealed tensioning cavities and sealed return cavities. The sealed tensioning cavities of all the pre-tightening pistons 114 are communicated with each other, and the sealed return cavities of all the pre-tightening pistons 114 are communicated with each other. The second sealing member 116 is arranged at one end of each pre-tightening piston 114 close to the overall tensioning unit 12.

[0023] The whole tension unit 12 comprises a front clamping tension jack 121, a first guide sleeve 122, a first tool clamp 123, a second guide sleeve 124 and a second tool clamp 125, the front clamping tension jack 121 comprises a jack cylinder body 1211, a piston 1212 and a limiting plate 1213, one end of the jack cylinder body 1211 is connected with the rear end cover 113 and is provided with a through hole for the pre-tightening piston 114 to pass through, the limiting plate 1213 is arranged at one end of the jack cylinder body 1211 away from the pre-tightening unit 11, the piston 1212 is a hollow structure, and one end of the piston 1212 passes through the limiting plate 1213; the first guide sleeve 122, the first tool clamp 123, the second guide sleeve 124 and the second tool clamp 125 are arranged in the piston 1212 respectively; the first guide sleeve 122 is arranged in parallel and is fixedly connected with the inner wall of the piston 1212 respectively; the first tool clamp 123 is arranged at one end of the first guide sleeve 122 close to the pre-tightening unit 11; the second guide sleeve 124 is arranged in parallel, and one end of the second guide sleeve 124 close to the first guide sleeve 122 is provided with the second tool clamp 125, and the other end of the second guide sleeve 124 passes through the limiting plate 1213; the pre-tightening piston 114, the first guide sleeve 122 and the second guide sleeve 124 are arranged correspondingly.

[0024] Further, the pre-tightening unit 11 further comprises a pre-tightening cylinder oil inlet 117 and a pre-tightening cylinder oil outlet 118, the pre-tightening cylinder oil inlet 117 communicates with the sealed tension cavity, and the pre-tightening cylinder oil outlet 118 communicates with the sealed return cavity.

[0025] Further, the whole tension device 1 further comprises a displacement measuring unit 13, and the displacement measuring unit 13 is arranged outside the front clamping tension jack 121.

[0026] Please refer to Figure 2 , Figure 2 is a flow chart of the whole tension method provided by the application. The whole tension device method comprises the following steps:

[0027] Step S1, the steel strand to be tensioned is arranged in the second guide sleeve 124, the second tool clamp 125, the first guide sleeve 122, the first tool clamp 123 and the pre-tightening piston 114 in sequence respectively;

[0028] Step S2, the pre-tightening unit 11 pre-tightens the steel strand to be tensioned;

[0029] Specifically, when pre-tightening, the pre-tightening cylinder inlet 117 is filled with oil, the pre-tightening piston 114 moves towards the overall tensioning unit 12, the first tool clamping piece 123 clamps and moves the steel strand, and the pre-tightening of the single steel strand is realized; in turn, the pre-tightening of each single steel strand is realized.

[0030] Step S3, the overall tensioning unit 12 performs overall tensioning on the pre-tightened steel strand.

[0031] Specifically, when tensioning after pre-tightening is completed, the oil inlet of the front clamping type tensioning jack 121 is filled with oil, each second tool clamping piece 125 clamps and moves the corresponding steel strand, and overall tensioning is realized.

[0032] Step S4, after tensioning and pressure maintaining are completed, slow unloading is performed, and after unloading is completed, the overall tensioning device is removed.

[0033] The overall tensioning device 1 provided by the application has the following beneficial effects:

[0034] I. By arranging the pre-tightening unit 11 and the overall tensioning unit 12, each single steel strand can be pre-tightened, the initial stress of each single steel strand can be kept uniform, and the prestressed tensioning quality is ensured.

[0035] II. By arranging the first guide sleeve 122, the first tool clamping piece 123, the second guide sleeve 124 and the second tool clamping piece 125 in the front clamping type tensioning jack 121, the length of the reserved steel strand can be greatly reduced, the material loss can be reduced, and the construction cost of the enterprise can be reduced.

[0036] The above is only an embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. An integral tensioning device, characterized in that, The system includes a pre-tensioning unit and an integrated tensioning unit connected to the pre-tensioning unit. The pre-tensioning unit includes a pre-tensioning cylinder body, a front end cover, a rear end cover, a pre-tensioning piston, a first seal, and a second seal. The front end cover and the rear end cover are respectively located at both ends of the pre-tensioning cylinder body. The pre-tensioning pistons are arranged parallel to each other within the pre-tensioning cylinder body, with both ends of each pre-tensioning piston passing through the front end cover and the rear end cover, respectively. The first seal is located in the middle of each pre-tensioning piston, dividing the entire pre-tensioning unit into independent sealed tensioning cavities and sealed return cavities. The sealed tensioning cavities of all pre-tensioning pistons are interconnected, and the sealed return cavities of all pre-tensioning pistons are interconnected. The second seal is located at one end of each pre-tensioning piston near the integrated tensioning unit. The integrated tensioning unit includes a front-clamping tensioning jack, a first guide sleeve, a first tool clamp, a second guide sleeve, and a second tool clamp. The front-clamping tensioning jack includes a jack cylinder, a piston, and a limiting plate. One end of the jack cylinder is connected to the rear end cover and has a through hole for the pre-tensioning piston to pass through. The limiting plate is located at the end of the jack cylinder away from the pre-tensioning unit. The piston has a hollow structure, and one end of the piston passes through the limiting plate. The first guide sleeve, the first tool clamp, the second guide sleeve, and the second tool clamp are respectively disposed inside the piston. The first guide sleeves are arranged in parallel and are fixedly connected to the inner wall of the piston. The first tool clamps are respectively disposed at the end of the first guide sleeve near the pre-tensioning unit. The second guide sleeves are arranged in parallel, and the second tool clamp is disposed at the end of the second guide sleeve near the first guide sleeve. The other end of the second guide sleeve passes through the limiting plate. The pre-tensioning piston, the first guide sleeve, and the second guide sleeve are arranged in a one-to-one correspondence.

2. The integral tensioning device according to claim 1, characterized in that, The pre-tightening unit also includes a pre-tightening cylinder inlet and a pre-tightening cylinder outlet. The pre-tightening cylinder inlet is connected to the sealing tension cavity, and the pre-tightening cylinder outlet is connected to the sealing return cavity.

3. The integral tensioning device according to claim 1, characterized in that, It also includes a displacement measuring unit, which is located on the outside of the front clamp tensioning jack.

4. A method for overall tensioning based on the overall tensioning device according to any one of claims 1 to 3, characterized in that, Includes the following steps: Step 1: Pass the steel strand to be tensioned through the second guide sleeve, the second tool clamp, the first guide sleeve, the first tool clamp, and the pre-tightening piston in sequence; Step 2: The pre-tightening unit pre-tightens the steel strand to be tensioned; Step 3: The overall tensioning unit tensions the pre-tightened steel strands as a whole; Step 4: After the tensioning and pressure holding are completed, slowly unload the entire tensioning device.

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