CN117127523A

CN117127523A - Bridge external prestress anchoring device

Info

Publication number: CN117127523A
Application number: CN202311255999.XA
Authority: CN
Inventors: 尚永毅; 张黎明; 李宗文; 黄庭华; 陈福良; 潘前; 韦汉
Original assignee: Guangxi Xinfazhan Communications Group Co Ltd
Current assignee: Guangxi Xinfazhan Communications Group Co Ltd
Priority date: 2023-09-27
Filing date: 2023-09-27
Publication date: 2023-11-28

Abstract

The application discloses an external prestress anchoring device for a bridge, which relates to the technical field of anchoring devices and comprises an anchor box, a protective pipe, a prestress rope, an anchor plate, a support plate, an anchor, a box filling assembly and a through hole plugging assembly, wherein the anchor box is provided with a support plate and a through hole plugging assembly; an annular sealing ring is arranged at the contact position between the bottom of the anchor box and the bridge; the in-box filling assembly comprises an in-box expanding big bag; the expansion bag in the box is a rubber elastic bag with paraffin built in, an injection channel pipe is fixed on the rubber elastic bag, and the expansion bag in the box is arranged in the anchor box when the anchor box is installed; the through hole plugging assembly is used for sealing the through hole and comprises an annular soft bag, wherein the annular soft bag is an annular rubber soft bag, and an injection pipe is fixed on the annular soft bag; the annular soft bag is sleeved on the prestress rope, and after the large bag expanding in the box is filled, an operator pumps paraffin to the annular soft bag through the injection pipe by utilizing the paraffin pumping assembly so as to expand the annular soft bag; the technical effects that the sealing effect of the external prestress anchoring device of the bridge is relatively good and the prestress cable is not easy to rust and damage are achieved.

Description

Bridge external prestress anchoring device

Technical Field

The application relates to the technical field of anchoring devices, in particular to an external prestress anchoring device for a bridge.

Background

The external prestress is the prestress generated by the prestress rope arranged outside the bearing structure main body, and the prestress rope transmits the prestress through the anchoring and steering entity; the external prestress reinforcement can greatly improve the bending rigidity of the concrete beam, remarkably reduce the deflection of the beam, and simultaneously under the beneficial effect of the reinforcement prestress, the crack of the beam tends to be reduced or even closed, the strain of the tensile steel bar is greatly reduced, and the stress increment of the prestress steel bar is increased; in addition, the external prestressed reinforcement is adopted for reinforcement, so that the inspection is easy, the replacement is convenient, and the construction is facilitated.

The prestressed cable is usually fixed outside the bridge body by adopting an anchor, and the end part of the prestressed cable is peeled off during actual use so as to be connected with the anchor; the end of the prestressed cable after peeling is exposed in the air and is easy to be corroded and damaged, so that an anchor box is arranged on an anchor outer cover to protect the prestressed cable in the prior art. However, the prestressed cable needs to transversely pass through the anchor box, so that a through hole for the prestressed cable to pass through needs to be arranged on the anchor box; because of processing and operation reasons, the through hole cannot be tightly connected with the prestressed cable, water vapor in the air can still enter the anchor box from the through hole, and the water vapor is slowly dissipated after being gathered in the semi-closed anchor box, so that the prestressed cable is corroded more easily.

Aiming at the problems, the Chinese patent publication No. CN110295550B discloses an external prestress anchoring device for a bridge, which comprises an anchor box, wherein a group of symmetrical side walls on the anchor box are provided with through holes for the prestress ropes to pass through, an anchor plate is transversely arranged in the anchor box, a supporting plate is vertically arranged on the anchor plate, a fixing hole for the prestress ropes to pass through is arranged on the supporting plate, and an anchor for fixing the prestress ropes is arranged on the supporting plate; a through hole on the anchor box is communicated with a protective tube, and the other through hole of the anchor box is connected with a sealing ring which is positioned between the prestressed cable and the through hole.

According to the scheme, although the amount of water vapor entering the anchor box can be reduced to a certain extent, so that the probability of corrosion damage of the prestressed cable is reduced, the sealing performance of the prestressed cable completely depends on the sealing ring, and once the sealing ring is aged and damaged or improperly installed, the sealing effect is easily lost, so that the external prestressed anchoring device of the bridge is damaged.

Disclosure of Invention

The embodiment of the application solves the technical problems that the sealing effect of the external prestress anchoring device of the bridge is completely dependent on the sealing ring, once the sealing ring is aged and damaged or improperly installed, the sealing effect is easily lost, and then the prestress cable is damaged in corrosion, and the technical effects that the sealing effect of the external prestress anchoring device of the bridge is relatively good and the prestress cable is difficult to damage in corrosion are realized.

The embodiment of the application provides an external prestress anchoring device for a bridge, which comprises an anchor box, a protection pipe, a prestress rope, an anchor plate, a support plate, an anchorage device, a box filling assembly and a through hole plugging assembly, wherein the anchor box is arranged on the support plate;

an annular sealing ring is arranged at the contact position between the bottom of the anchor box and the bridge;

the in-box filling assembly comprises an in-box expanding big bag;

the expansion bag in the box is a rubber elastic bag with paraffin built in, an injection channel pipe is fixed on the rubber elastic bag, the rubber elastic bag is arranged in the anchor box when the anchor box is installed, heated liquid paraffin is poured into the expansion bag in the box through a paraffin pumping assembly after the anchor box is fixed, then the expansion bag in the box is unfolded, most of gas in the inner space of the anchor box is extruded, and meanwhile, a prestress rope in the box is wrapped;

the through hole plugging assembly is used for sealing the through hole and comprises an annular soft bag, wherein the annular soft bag is an annular rubber soft bag, and an injection pipe is fixed on the annular soft bag; the annular soft bag is sleeved on the prestressed cable, after filling of the large bag in the tank is completed, an operator pumps paraffin to the annular soft bag through the injection pipe by utilizing the paraffin pumping assembly, so that the annular soft bag expands and abuts against the through hole to seal the through hole, and the injection pipe is sealed after the pumping is completed.

Preferably, the annular soft bag comprises a paraffin bag and a coating bag, wherein the paraffin bag is an annular bag body, and the interior of the annular soft bag is used for filling paraffin;

the wrapping bag is an annular tubular bag body, is wrapped on the paraffin bag and wraps the paraffin bag in, and consists of a first bag body and a second bag body;

the first bag body and the second bag body are annular rubber capsules, the first bag body is sleeved on the second bag body, an annular tubular space is formed between the first bag body and the second bag body, and the first bag body and the second bag body are fixed together in a sewing mode, so that the annular tubular space is divided into a plurality of square spaces;

the interior of the square-grid-shaped spaces is filled with magnetic powder; the annular soft capsule is adsorbed on the inner wall of the through hole due to the magnetic powder.

Preferably, the annular soft bag is in a long strip shape before being installed, and is bent into an annular shape during installation.

Preferably, a threaded pipe is fixed on the anchor box, and the threaded pipe is coaxial with the through hole and is fixed at a position close to the through hole; after the annular soft bag is installed, an annular cover plate is installed on the threaded pipe to shield the annular soft bag, so that aging of the annular soft bag is reduced.

Preferably, when the anchor box is installed, a piece of anti-scratch cloth is covered on the supporting plate and the anchor, and the anti-scratch cloth is sheet-shaped.

Preferably, the anchor box comprises a fixed box body and a top box, the fixed box body is of a box body structure with openings at the top and the bottom and is fixed on the bridge, and the top box is of a box body structure with an opening at the bottom and is detachably and fixedly connected to the fixed box body to form a box body together with the fixed box body;

the through hole is positioned on the fixed box body; the number of the expansion bags in the box is multiple, and the expansion bags are respectively adhered to the fixed box body and the top box; when the maintenance is needed, the top box can be disassembled and the expansion bag in the box can be opened for maintenance.

Preferably, a heat conducting plate which is longitudinally arranged is fixed on the top box, and divides the top box into two parts, so that the deformation of the expanding large bag in the box can be limited, and the expanding large bag in the box can be conveniently opened for maintenance;

before the top box is disassembled, firstly, a heating blanket is covered on the top box, and the heating blanket is an electric blanket;

heating the top box before the top box is disassembled so as to facilitate the softening of paraffin in the anchor box and the unpacking of the expansion bag in the box; the heat conducting plate is made of metal and plays a role in conducting heat.

Preferably, the paraffin pumped into the annular soft capsule is doped with 0.5 to 3 percent of fiber and 3 to 7 percent of gas, and the length of the fiber is 1 to 2 cm; when in pumping, the gas pumped into the annular soft bag exists in the form of a large number of small bubbles; the fiber plays a role in reducing the fluidity of paraffin; if paraffin in the annular soft bag melts, bubbles doped in the paraffin can move upwards to the position close to the top of the annular soft bag, so that the annular soft bag is ensured to be in a swelling state continuously, and further the sealing effect is ensured.

Preferably, the wax pumping assembly comprises a wax bin, a pump body, a conveying pipe, an embedding head and a pressure sensor;

the wax bin, the pump body and the conveying pipe are all provided with electric heating wires, so that paraffin is guaranteed to be in a liquid state in the pumping process, and the embedded head is fixed at the end part of the conveying pipe and is a conical pipe which can be matched with the injection channel pipe to play a role of a joint; the pressure sensor is positioned on the conveying pipe and is in signal connection with a display screen positioned on the pump body, and is used for monitoring the pressure in the conveying pipe so as to judge the filling condition of the inner space of the anchor box;

and stopping the operation of the wax pumping assembly and plugging the injection channel pipe when the internal space of the anchor box is basically filled.

Preferably, the mixing component is fixed on the conveying pipe; the mixing component comprises a bearing box body, a rotating column, a pumping component and a stock bin;

the bearing box body is of a box body structure, two side parting strips are fixed on the inner wall of the bearing box body near the middle part, the side parting strips are hard strips, and the two side parting strips are symmetrically arranged; the opposite surfaces of the two side parting strips are respectively fixed with a strip-shaped closed bag, the strip-shaped closed bags are strip-shaped elastic bag bodies and are communicated with the pumping assembly, and the expansion and the contraction are carried out under the control of the pumping assembly;

the rotating column is a cylinder and is rotationally connected to the inner wall of the bearing box body, and is driven by the rotating driving assembly to rotate around the axis of the rotating column, the axial direction of the rotating column is the same as the length direction of the side parting bead, and both ends of the rotating column are abutted against the inner wall of the bearing box body;

a plurality of bulges or pits are densely distributed on the side wall of the rotating column, and a temperature adjusting component is positioned in the rotating column;

when the strip-shaped closed bag expands, the strip-shaped closed bag can be abutted against the side wall of the rotating column; at this time, the side parting strips, the strip-shaped closed bags and the rotating columns divide the interior of the bearing box body into an upper closed space and a lower closed space; the wall of the space positioned below is densely provided with resistance wires, a paraffin inlet and a paraffin outlet, the bottom of the paraffin inlet is provided with a gas inlet, the paraffin outlet is provided with a detachable one-way valve, and the wall of the space positioned above is provided with a gas blowing inlet, a ventilation opening and a fiber inlet; a nozzle is fixed on the gas blowing inlet;

the air pumping component is a combination of an air pump and an air valve and is communicated with the air input port, the air blowing port and the strip-shaped closed bag;

the bin is positioned at the top of the bearing box body, a material distributing and blocking mechanism is arranged in the bin and communicated with the fiber inlet, and quantitative fibers are timely input into a space above the bin.

One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:

the structure of a sealing component of the bridge external prestress anchoring device in the prior art is optimized and improved, an annular paraffin bag is used for plugging the through hole, and the inner space of the anchor box is filled with the elastic paraffin bag; the technical problems that in the prior art, the sealing effect of the external prestress anchoring device of the bridge is completely dependent on the sealing ring, once the sealing ring is aged and damaged or improperly installed, the sealing effect is lost easily, and then the prestress cable is damaged in corrosion are solved, and the technical effects that the sealing effect of the external prestress anchoring device of the bridge is relatively good and the prestress cable is difficult to damage in corrosion are achieved.

Drawings

FIG. 1 is a schematic structural view of an external prestress anchoring device for a bridge girder according to the present application;

FIG. 2 is a schematic view of the external structure of the anchor box;

FIG. 3 is a schematic view of the structure of the annular bladder;

FIG. 4 is a cross-sectional view of the annular bladder;

FIG. 5 is a schematic view of a partial structure of the covering bladder;

FIG. 6 is a schematic diagram of the bellows in the tank;

FIG. 7 is a schematic illustration of the positional relationship of the outer bladder and the inner bladder;

FIG. 8 is a schematic diagram of a shaped bellows;

FIG. 9 is a schematic view of the positional relationship between the stationary housing and the top housing;

FIG. 10 is a schematic view of the structure of the top box;

FIG. 11 is a schematic illustration of a pump wax assembly;

FIG. 12 is a schematic view of a heating blanket;

FIG. 13 is a schematic view of the deformed annular bladder;

FIG. 14 is a schematic view of a gas-filled annular bladder;

FIG. 15 is a schematic view of the internal structure of the mixing assembly;

FIG. 16 is a schematic view of the external appearance of the mixing assembly;

FIG. 17 is a schematic view of a rotating column;

fig. 18 is a schematic view of the internal structure of the mixing assembly.

In the figure:

bridge 001, anchor box 010, through hole 011, fixed box 012, top box 013, heat conducting plate 015, protective tube 020, prestressed cable 030, anchor plate 040, support plate 050, anchor 060, scratch-proof piece 070, desiccant bag 080, annular soft bag 110, injection tube 111, paraffin bag 112, coating bag 113, in-box expansion bag 120, injection channel tube 121, outer layer bag 122, inner layer bag 123, electric heating wire 130, wax pumping assembly 140, pressure sensor 141, heating blanket 150, carrying box 161, side barrier 162, strip-shaped closed bag 163, rotary column 164, rotary driving assembly 166, pumping assembly 167, and stock bin 168.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings; the preferred embodiments of the present application are illustrated in the drawings, however, the present application may be embodied in many different forms and is not limited to the embodiments described herein; rather, these embodiments are provided so that this disclosure will be thorough and complete.

It should be noted that the terms "vertical", "horizontal", "upper", "lower", "left", "right", and the like are used herein for illustrative purposes only and do not represent the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Example 1

As shown in fig. 1 to 6, the external prestress anchoring device of the bridge girder according to the present application comprises an anchor box 010 fixed on a bridge girder 001, a protective pipe 020, a prestress rope 030, an anchor plate 040, a support plate 050, an anchor 060, an in-box filling component and a through hole plugging component.

The anchor box 010 is an iron box body with an opening at the bottom and is fixed on the bridge 001 through bolts; the contact position of the bottom of the anchor box 010 and the bridge is provided with one or more annular grooves, annular sealing rings are filled in the grooves, and the sealing rings in the grooves are abutted against the bridge 001 after the anchor box 010 is installed, so that the effect of preventing water vapor from entering the anchor box 010 through a gap between the anchor box 010 and the bridge 001 is achieved; the left side wall and the right side wall of the anchor box 010 are provided with through holes 011 for the prestressed cables 030 to pass through, the left through holes 011 are provided with protective pipes 020, the left ends of the protective pipes 020 are sealed, the protective pipes 020 are sleeved at the left ends of the prestressed cables 030, and are fixed on the anchor box 010 by bolts; an anchor plate 040 is transversely arranged in the anchor box 010, and the anchor plate 040 is fastened on the bridge 001 through bolts; a supporting plate 050 is vertically welded on the anchor plate 040, a fixing hole for the prestressed cable 030 to pass through is formed in the supporting plate 050, and an anchor 060 for fixing the prestressed cable 030 is arranged on the left side of the supporting plate 050; the end of the prestressed cable 030 sequentially passes through a through hole 011 on the right side of the anchor box 010, a support plate 050 and an anchor 060, and finally extends to the outside of the through hole 011 on the left side of the anchor box 010, anchors the prestressed cable 030 through the anchor 060, and fixes the protecting tube 020 at the end of the prestressed cable 030 on the anchor box 010.

The in-box filling assembly is used for filling the inner space of the anchor box 010 and is detachable when overhauling, and comprises an in-box expansion bag 120; the in-tank expansion bladder 120 is a rubber elastic bladder with paraffin inside, and a soft injection channel tube 121 is fixed on the rubber elastic bladder; the anchor box 010 is arranged in the anchor box 010 (put in before fixing or plugged in from the through hole 011 after fixing), after the anchor box 010 is fixed, heated liquid paraffin is poured into the expansion bladder 120 through the injection channel pipe 121 by the wax pumping component 140, then the expansion bladder 120 is unfolded and most of gas in the inner space of the anchor box 010 is extruded, and meanwhile, the prestressed cable 030 in the box is wrapped; as shown in fig. 11, the pump wax assembly 140 includes a wax cartridge, a pump body, a delivery tube, an embedded head, and a pressure sensor 141; the wax bin, the pump body and the conveying pipe are all provided with electric heating wires, so that paraffin is guaranteed to be in a liquid state in the pumping process, and the embedding head is fixed at the end part of the conveying pipe, is a conical pipe and can be matched with the injection channel pipe 121 to play a role of a joint; the pressure sensor 141 is positioned on the conveying pipe and is in signal connection with a display screen positioned on the pump body, and is used for monitoring the pressure in the conveying pipe so as to judge the filling condition of the inner space of the anchor box 010; when the internal space of the anchor box 010 is substantially filled, the operation of the wax pumping assembly 140 is stopped and the injection passage tube 121 is blocked.

The through hole plugging assembly is used for sealing the through hole 011 and comprises an annular soft bag 110; the annular soft bag 110 is an annular rubber soft bag, and an injection pipe 111 is fixed on the annular soft bag; the annular soft bag 110 is sleeved on the prestressed cable 030, after the filling of the expansion bag 120 in the tank is completed, an operator pumps paraffin to the annular soft bag 110 through the injection pipe 111 by utilizing the paraffin pumping assembly 140 so as to expand the annular soft bag 110 and prop against the through hole 011 to further seal the through hole 011, and after the pumping is completed, the injection pipe 111 is sealed; the annular soft bag 110 comprises a paraffin bag 112 and a coating bag 113, wherein the paraffin bag 112 is an annular bag body, and the interior of the annular soft bag is used for filling paraffin; the coating bag 113 is an annular tubular bag body, is coated on the paraffin bag 112 and wraps the paraffin bag 112, and the coating bag 113 consists of a first bag body and a second bag body; the first bag body and the second bag body are annular rubber capsules, the first bag body is sleeved on the second bag body, an annular tubular space is formed between the first bag body and the second bag body, and the first bag body and the second bag body are fixed together in a sewing mode, so that the annular tubular space is divided into a plurality of square spaces (similar to a down jacket liner); the interior of the square-grid-shaped spaces is filled with magnetic powder; the annular soft capsule 110 is adsorbed on the inner wall of the through hole 011 due to the magnetic powder, thereby further improving the sealing effect.

Preferably, the injection tube 111 and the injection channel tube 121 are both plastic hoses, and are closed by knotting.

When the external prestress anchoring device for the bridge provided by the embodiment of the application is actually used, after the anchor box 010 is fixed, the internal space of the anchor box 010 is filled first, and then the annular soft bag 110 is controlled to expand to seal the through hole 011.

Preferably, for easy replacement, the annular soft bag 110 is shaped like a long strip before being installed, and is folded into an annular shape during installation.

Preferably, in order to reduce ageing of the annular soft bag 110, as shown in fig. 1, a threaded tube is fixed on the anchor box 010, and the threaded tube is coaxial with the through hole 011 and is fixed at a position close to the through hole 011; after the annular soft bag 110 is installed, an annular cover plate is installed on the threaded pipe to shield the annular soft bag 110, so that the aging of the annular soft bag is reduced.

Preferably, in order to limit the flow of paraffin in the in-tank expansion bladder 120 after completion of filling, as shown in fig. 7, the in-tank expansion bladder 120 is a double-layered bladder composed of an outer bladder 122 and an inner bladder 123, the outer bladder 122 covers the inner bladder 123, and fine pores are densely distributed on the inner bladder 123; during the paraffin filling process, a portion of the paraffin may flow into the space between the outer bladder 122 and the inner bladder 123.

Preferably, as shown in fig. 8, the in-tank expansion bladder 120 is composed of a plurality of pie-shaped bladders, which are identical or different in size, and are strung in a string and communicate with each other.

The expanding bag 120 in the box is formed by a plurality of cake-shaped and/or spherical bag bodies, and is adhered to the inner wall of the anchor box 010 according to the actual space shape in the anchor box 010 before the anchor box 010 is installed.

In order to reduce the probability of scratch during the swelling of the swelling bladder 120 in the case, as shown in fig. 1, when the anchor case 010 is installed, a piece of scratch-proof cloth 070 is first covered on the support plate 050 and the anchor 060, and the scratch-proof cloth 070 is a piece of scratch-proof cloth.

Preferably, upon installation of the anchor boxes 010, one or more desiccant packs 080 are first put into them.

The technical scheme provided by the embodiment of the application at least has the following technical effects or advantages:

the technical problems that in the prior art, the sealing effect of the external prestress anchoring device of the bridge is completely dependent on a sealing ring, once the sealing ring is aged and damaged or improperly installed, the sealing effect is lost easily, and then the prestress cable is corroded and damaged are solved, and the technical effects that the sealing effect of the external prestress anchoring device of the bridge is relatively good and the prestress cable is corroded and damaged are not easy to cause are achieved.

Example two

In order to ensure the stability and reliability of the anchoring device and avoid the loosening or failure of the anchoring device, the external prestress anchoring device of the bridge needs to be regularly overhauled and maintained; in the above embodiments and the prior art, in order to perform maintenance, a part of the concrete structure may need to be removed during the maintenance process, and the structure is damaged to a certain extent; in order to solve the above problems, the embodiment of the present application optimizes and improves the structures of the anchor box 010 and the expansion bladder 120 in the box, specifically:

as shown in fig. 9 and 10, the anchor box 010 includes a fixed box 012 and a top box 013, the fixed box 012 is a box structure with openings at the top and the bottom, and is fixed on the bridge 001, and the top box 013 is a box structure with an opening at the bottom, and is detachably and fixedly connected to the fixed box 012, and forms a box together with the fixed box 012; the through hole 011 is positioned on the fixed box 012; the number of the bellows 120 is plural, and the bellows are adhered to the fixed case 012 and the top case 013, respectively. When maintenance is required, the top tank 013 can be detached and the inner expansion bag 120 can be opened for maintenance.

Preferably, an annular sealing plate is placed at the contact position between the top case 013 and the fixed case 012.

Preferably, in order to facilitate maintenance, a heat conducting plate 015 is fixed in the top tank 013, and the heat conducting plate 015 divides the top tank 013 into two parts, so that deformation of the expansion bladder 120 in the tank can be limited, and the expansion bladder 120 in the tank can be conveniently opened for maintenance.

In order to facilitate maintenance, before the top box 013 is detached, a heating blanket 150 as shown in fig. 12 may be covered on the top box 013, and the heating blanket 150 is an electric blanket (including an electric heating layer and a heat insulation reflecting layer), preferably in a cross shape; heating the top box 013 before removing the top box 013, thereby facilitating the softening of paraffin in the anchor box 010 and further facilitating the unpacking of the expansion bag 120 in the box; the heat conducting plate 015 is made of metal and plays a role in conducting heat.

Before maintenance, the paraffin in the annular soft bag 110 and the bellows 120 can be completely or partially pumped out by the wax pumping assembly 140.

Preferably, in order to further facilitate the wax pumping assembly 140 to pump out the paraffin wax in the annular soft bag 110 and the expanding bag 120 in the box, the annular soft bag 110 and the expanding bag 120 in the box are also provided with electric heating wires 130, the electric heating wires 130 are resistance wires, the electric heating wires 130 are sleeved with heat insulation sleeves for avoiding scalding the bag body, and the heat insulation sleeves are preferably a combination of a plurality of plastic pipes; the electric heating wire 130 extends out of the injection tube 111 and the injection channel tube 121 and is electrically connected with a power supply; when the paraffin is drawn out, the electric heating wire 130 operates to heat and liquefy the paraffin.

Example III

Considering that the annular soft bag 110 of the above embodiment has the inner wall of the magnetic powder adsorption through hole 011 in the coating bag 113 to avoid air leakage, but after the annular soft bag 110 is used for a long time, there is still a certain risk of the sealing effect of the top position being weak due to the influence of dead weight due to the whole sagging of paraffin in the annular soft bag 110 after being melted, in order to further reduce the risk of air leakage, the embodiment of the application improves the filler in the annular soft bag 110 on the basis of the above embodiment, further limits the flow of paraffin in the annular soft bag 110 and ensures the stability of the sealing effect of the top position of the annular soft bag 110, specifically:

the paraffin pumped into the annular soft bag 110 is more uniformly doped with 0.5 to 3 percent of fiber and 3 to 7 percent of gas, and the length of the fiber is 1 to 2 cm; when in pumping, the gas pumped into the annular soft bag 110 exists in the form of a large number of small bubbles; as shown in fig. 13 and 14; the fiber plays a role in reducing the fluidity of paraffin; if paraffin in the annular soft bag 110 melts, bubbles doped in the paraffin move upwards to a position close to the top of the annular soft bag 110, so that the annular soft bag 110 is ensured to be in a swelling state continuously, and further the sealing effect is ensured.

In order to facilitate the mixing of bubbles and fibers in the paraffin, as shown in fig. 15 to 18, a mixing assembly is fixed on the conveying pipe; the mixing assembly includes a carrying case 161, a rotating column 164, a pumping assembly 167, and a bin 168;

the bearing box 161 is of a box structure, two side parting strips 162 are fixed on the inner wall of the bearing box near the middle, the side parting strips 162 are hard strips, and the two side parting strips 162 are symmetrically arranged; the strip-shaped closed bags 163 are fixed on the opposite surfaces of the two side parting strips 162, the strip-shaped closed bags 163 are strip-shaped elastic bags and are communicated with the pumping assembly 167, and the pumping assembly 167 is controlled to expand and contract;

the rotating column 164 is a cylinder, and is rotatably connected to the inner wall of the carrying case 161, and is driven by the rotating driving assembly 166 to rotate around its own axis, the rotating driving assembly 166 is preferably a motor, the axial direction of the rotating column 164 is the same as the length direction of the side parting bead 162, and both ends of the rotating column are abutted against the inner wall of the carrying case 161; a plurality of bulges or pits are densely distributed on the side wall of the rotating column 164, and a temperature adjusting component is positioned in the rotating column, wherein the temperature adjusting component is preferably a combination of a resistance wire and a semiconductor refrigerating sheet;

when the strip-shaped closed bag 163 swells, it will collide with the side wall of the rotary column 164; at this time, the side parting strips 162, the strip-shaped closed bags 163 and the rotating columns 164 divide the interior of the carrying case 161 into an upper closed space and a lower closed space; the wall of the space positioned below is densely provided with resistance wires, a paraffin inlet and a paraffin outlet, the bottom of the paraffin inlet is provided with a gas inlet, the paraffin outlet is provided with a detachable one-way valve, and the wall of the space positioned above is provided with a gas blowing inlet, a ventilation opening and a fiber inlet; a nozzle capable of swinging is fixed on the gas blowing inlet;

the pumping assembly 167 is a combination of an air pump and an air valve, and is communicated with the gas input port, the gas blowing port and the strip-shaped closed bag 163;

the bin 168 is positioned at the top of the bearing box body 161, is internally provided with a material distributing and blocking mechanism and is communicated with the fiber inlet, and quantitative fibers are timely input into a space above the bin;

in the actual use process, the strip-shaped closed bags 163 are periodically expanded and contracted; the pump body also pumps paraffin into the bearing box 161 periodically; the pump body stops running when the strip-shaped closed bag 163 contracts;

during the paraffin filling process, the strip-shaped closing bag 163 is first contracted, and then the rotating column 164 is rotated 180 degrees, and a part of liquid paraffin is adhered to the side wall of the column and is brought into the space above; the strip-shaped closing bag 163 is then inflated, and the rotating column 164 controls self-cooling so that paraffin brought into the space above is solidified; then the bin 168 outputs quantitative fibers, and the gas blowing inlet pumps gas to blow off the fibers in the space above and then stops blowing; the rotating column 164 is heated to liquefy the paraffin adhering to the side wall thereof; then controlling the strip-shaped closed bag 163 to shrink and controlling the rotary column 164 to rotate 180 degrees, and mixing the paraffin adhered with the fibers into the paraffin in the space below; then the above actions are circularly carried out until the filling is completed; during which the gas inlet port continues to inject gas into the paraffin in the space below.

Preferably, the conveying pipe is formed by splicing two sections of pipe bodies, and a section of pipe body far away from the pump body is detachably fixed on a section of pipe body close to the pump body; the volume of a section of tube body far away from the pump body is larger than that of the annular soft bag 110; after the paraffin in the annular soft bag 110 is pumped out by the pump wax component 140, a section of pipe body far away from the pump body can be detached and the paraffin in the pipe body can be poured out, and the pump body can be directly controlled to pump out the paraffin pumped into the conveying pipe from the annular soft bag 110 so as to avoid damage to the pump body by fibers.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The utility model provides an external prestressing force anchor of bridge, includes anchor box, protective tube, prestressing force cable, anchor board, backup pad and ground tackle, its characterized in that: the device also comprises a filling assembly in the box and a through hole plugging assembly;

the in-box filling assembly comprises an in-box expanding big bag;

2. The bridge extracorporeal pre-stress anchoring device of claim 1, wherein: the annular soft bag comprises a paraffin bag and a coating bag, wherein the paraffin bag is an annular bag body, and paraffin is filled in the annular bag body;

3. The bridge extracorporeal pre-stress anchoring device of claim 1, wherein: the annular soft bag is strip-shaped before installation and is bent into an annular shape during installation.

4. The bridge extracorporeal pre-stress anchoring device of claim 1, wherein: a threaded pipe is fixed on the anchor box, is coaxial with the through hole and is fixed at a position close to the through hole; after the annular soft bag is installed, an annular cover plate is installed on the threaded pipe to shield the annular soft bag, so that aging of the annular soft bag is reduced.

5. The bridge extracorporeal pre-stress anchoring device of claim 1, wherein: when the anchor box is installed, firstly, a piece of anti-scratching cloth is covered on the supporting plate and the anchor, and the anti-scratching cloth is flaky.

6. The bridge extracorporeal pre-stress anchoring device of claim 1, wherein: the anchor box comprises a fixed box body and a top box, wherein the fixed box body is of a box body structure with openings at the top and the bottom and is fixed on a bridge, and the top box is of a box body structure with an opening at the bottom and is detachably and fixedly connected to the fixed box body to form a box body together with the fixed box body; the through hole is positioned on the fixed box body; the number of the expansion bags in the box is multiple, and the expansion bags are respectively adhered to the fixed box body and the top box; when the maintenance is needed, the top box can be disassembled and the expansion bag in the box can be opened for maintenance.

7. The bridge extracorporeal pre-stress anchoring device of claim 6, wherein: the top box is fixedly provided with a heat conducting plate which is longitudinally arranged, the heat conducting plate divides the top box into two parts, and the deformation of the expanding large bag in the box can be limited, so that the expanding large bag in the box can be conveniently opened for maintenance;

8. The bridge extracorporeal pre-stressing anchor device as claimed in any one of claims 1 to 7, characterized in that: the paraffin pumped into the annular soft bag is doped with 0.5 to 3 percent of fiber and 3 to 7 percent of gas, and the length of the fiber is 1 to 2 cm; when in pumping, the gas pumped into the annular soft bag exists in the form of a large number of small bubbles; the fiber plays a role in reducing the fluidity of paraffin; if paraffin in the annular soft bag melts, bubbles doped in the paraffin can move upwards to the position close to the top of the annular soft bag, so that the annular soft bag is ensured to be in a swelling state continuously, and further the sealing effect is ensured.

9. The bridge extracorporeal pre-stress anchoring device of claim 8, wherein: the wax pumping assembly comprises a wax bin, a pump body, a conveying pipe, an embedding head and a pressure sensor;

10. The bridge extracorporeal pre-stress anchoring device of claim 9, wherein: a mixing component is fixed on the conveying pipe; the mixing component comprises a bearing box body, a rotating column, a pumping component and a stock bin;