WO2019068231A1

WO2019068231A1 - Cast-in-place tooling for polyurethane elastomer expansion joint of railway bridge

Info

Publication number: WO2019068231A1
Application number: PCT/CN2017/105287
Authority: WO
Inventors: 朱子毅
Original assignee: 朱子毅
Priority date: 2017-10-08
Filing date: 2017-10-08
Publication date: 2019-04-11

Abstract

Disclosed is cast-in-place tooling for a polyurethane elastomer expansion joint of a railway bridge, the tooling comprising: an air bag (3), an inflation valve (5), an inflation pump (6), an air pressure meter (7), end gaskets (8) and stoppers (9), wherein the air bag (3) is provided with the inflation valve (5); the air pressure meter (7) is mounted at a ventilation pipe of the inflation pump (6); the air bag (3) is covered with a layer of plastic film; and the end gaskets (8) and the stoppers (9) are mounted at an upper portion of the air bag (3) and at two ends of a bridge joint. The tooling innovates a construction process for high-speed railway expansion joints, and improves the working efficiency of elastomer expansion joint construction.

Description

Title of Invention: A railway bridge polyurethane elastomer expansion joint on-site pouring tooling

[0001] The utility model relates to a cast-in-place tooling for a polyurethane elastic expansion joint of a railway bridge.

Background technique

[0002] The expansion joint of railway concrete bridge is an important part of the overall waterproofing of the bridge deck and the expansion of the structure. It is directly related to the effectiveness of the bridge waterproof system and the durability of the structure. China's ordinary railway concrete bridge beam joints are mostly covered with steel or concrete cover plates, and high-speed railway concrete bridge beams are generally used with rubber waterstop expansion joints. Due to the difficulty in construction of rubber waterstops, it is easy to cause the rubber strips to be not firmly embedded. , or due to poor installation accuracy control, it is easy to cause staggered, torsion and other phenomena, resulting in deformation of the expansion joint, seriously affecting the quality of the expansion joint drainage. When the expansion joint strip falls off and the function is lost, the rail system needs to be raised. The replacement repair process is complicated and cannot be replaced. At the same time, it is easy to accumulate garbage and block the drainage path. The accumulation of water in the northern winter passage also causes poor drainage. According to the application status of the expansion joints of railway bridges, combined with the structure and operation characteristics of railway bridges, the Institute of Iron and Steel Institute and other institutions have developed bridge expansion joints, elastic expansion joints at the hairline, and have been tested and used in recent years with good results. The elastic expansion joint consists of three parts: the primer coating, the elastic body, and the top coating. It can be used for casting and forming the bottom support, the liner (backing and end lining) for supporting and forming the mold for auxiliary casting. The underlay is located at the bottom of the elastomeric expansion joint and the end lining is at the end of the beam joint. The bottom lining is a door type structure. Before the construction, the beam body or the water stop must be stepped to create a footing point of the bottom edge of the bottom door, and the level and flatness of the landing point are extremely high, otherwise the lining is required. It is necessary to distort. The on-site construction of the lining has a certain supporting capacity, and its rigidity is relatively large. After the elastomer material is poured, the lining continues to remain at the bottom of the elastic expansion joint, and the beam ends are stretched in the last hundred years of operation. After twenty or thirty years, she fell off and lost. In order to solve the above problems, it is indeed necessary to provide a high-speed railway polyurethane elastomer expansion joint airbag construction tooling to overcome the disadvantages described in the prior art. The utility model adopts an air bag as a mold for molding an elastic body expansion joint, and functions as a positioning molding. The principle is simple, the structure is concise, the construction is safe and fast, the components are light, the process is simplified, the auxiliary materials are few, the materials are saved, the work efficiency is high, the practicability is strong, and the utility model is beneficial to the use of the turnover and the reverse operation, and the above problems are successfully solved. technical problem

[0003] The technical problem to be solved by the utility model is: providing a railway bridge polyurethane elastic expansion joint on-site pouring tooling, to simplify the steps of cutting steps in the existing process, and the difficulty of installing the arc-shaped lining, and improving the tooling Practicality and productivity. And overcome the problem of distortion of the underlay, difficulty in removal, falling, falling off, etc.

Problem solution

Technical solution

[0004] The technical solution adopted by the utility model to solve the technical problem is: designing a railway bridge polyurethane elastic expansion joint on-site pouring tooling, including airbag, inflation valve, air pump, air pressure gauge, end lining, stopper, airbag An air-filled valve is arranged on the air pipe; the air pressure gauge is installed on the air pipe of the air pump; the end lining and the baffle are installed on the upper part of the airbag at the beam beam end; the airbag cut surface is a long capsule type, and the upper and lower sides are round end type, the length of the cut surface Not less than 45cm, the maximum width after inflation and expansion is not less than 16cm; the length of the airbag is not less than the length of the beam of the box girder; the airbag is made of rubber and has a thickness of not less than 6mm; the airbag is covered with a plastic film to improve the airbag The service life and the separation of the partition and the elastic body; the inflatable valve is installed at both ends of the longitudinal direction of the airbag, the upper end of the circular end of the cut surface, and the single airbag is installed with two inflatable valves; the pneumatic pump is a pneumatic booster pump The output gas is air; the gauge of the air pressure gauge is not less than 2 kg/cm 2 ; and the air pressure of the airbag is 0.8 to 1.2 kg/cm 2 Around inside. The end lining is a lower semi-circular plastic wedge block, and a plastic film is wrapped around it to facilitate demoulding.

[0005] The stopper functions as a positioning and setting, and is a wooden block having a width of 10 cm, a height of 10 cm, and a length of 20 cm, and is covered with a plastic film to facilitate demolding. The airbag should be tested for inflating air tightness or water tightness before use. When the airtightness test is carried out, the air pressure drops by no more than 0.03kg/m 2 after 2 hours; the airbag is stored after being deflated, and is rolled and rolled from one end. The inflating valve is exposed to the airbag to prevent the puncture of the airbag or damage to the inflation valve.

Advantageous effects of the invention

Beneficial effect

[0006] Advantageous Effects: The utility model invents a set of airbag method tool for high-speed railway polyurethane elastomer expansion joint construction by using airbag, inflation valve, air pump, air pressure gauge, end lining and baffle, and overcomes high-speed railway concrete bridge It is difficult to use the rubber water stop expansion joint between the beams, which is easy to cause the rubber strip to be embedded. Pegs, misalignment, and distortion. The inflated airbag is used as an auxiliary expansion molding mold for the elastic expansion joint. The support force generated by the tight air pressure between the side of the airbag and the beam supports the weight of the elastic body. The lower arc structure of the elastic expansion joint is shaped by the structural section of the round end shape of the airbag. The plastic film wrapped by the airbag blocks the adhesion of the elastomer to the rubber of the airbag. When the airbag is deflated, the mold naturally falls off, and the installation and removal are very convenient. It has achieved the steps of simplifying the steps in the existing process, and the difficulty of installing the arc-shaped lining, improving the practicability and work efficiency of the polyurethane elastomer expansion joint construction. The principle is simple, the structure is concise, the construction is safe and fast, and the components are light. The process is simplified, the auxiliary materials are less, the materials are saved, the work efficiency is high, the utility is strong, and the utility model is beneficial to the use of the turnover and the back-transport, and can fundamentally solve the problem that the base lining is twisted, the installation is difficult, the drop is easy, and the fall off.

Brief description of the drawing

DRAWINGS

1 is a front view of a cast-in-place tooling of a polyurethane bridge expansion joint of a railway bridge according to the present invention. [0008] FIG. 2 is a front view of a cast-in-place tooling of a polyurethane bridge expansion joint of a railway bridge of the present invention. Figure

[0009] In the figure: 1. Beam body, 2. Water stop, 3. Airbag, 4. Polyurethane elastomer, 5. Inflator valve, 6 air pump

, 7 barometer, 8 end lining, 9 block. .

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] As shown in the figure, the construction of a new high-speed railway polyurethane elastomer expansion joint airbag method in the northern region is taken as an example.

[0011] The utility model relates to a railway bridge polyurethane elastic expansion joint on-site pouring tool, which comprises an air bag 3, an inflation valve 5, an air pump 6, a barometer 7, an end liner 8, and a stopper 9. The airbag is provided with an inflation valve 5; the air pressure gauge 7 is mounted on the air duct of the air pump 6; the airbag 3 is covered with a plastic film; the end liner 8 and the baffle 9 are mounted on the upper part of the airbag at the end of the beam beam; The airbag 3 has a long capsule shape and a round end shape, the length of the cut surface is not less than 45 cm, and the maximum width after inflation and expansion is not less than 16 cm; the length of the airbag 3 is not less than the length of the beam of the box girder; The rubber material has a thickness of not less than 6 mm; the airbag 3 is covered with a plastic film to improve the service life of the airbag and the adhesion of the partition to the elastic body; the inflation valve 5 is installed at both ends of the longitudinal direction of the airbag 3, and the cut surface Upper and lower rounded upper sections, two single airbags 3; The air pump 6 is a pneumatic booster pump, and the output gas is air; the gauge of the air pressure gauge 7 is not less than 2 kg/cm 2 ; and the air pressure of the airbag 3 is in the range of 0.8 to 1.2 kg/cm 2 . The end liner 8 is a lower semi-circular plastic wedge block, which is wrapped with a plastic film to facilitate demoulding. The block 9 functions as a positioning and setting body, and is a wooden block having a width of 10 cm, a height of 10 cm and a length of 20 cm, and is covered with a plastic film to facilitate demolding. The airbag 3 is to be subjected to an airtightness test or a watertightness test before use. When the airtightness test is performed, the air pressure drop is not more than 0.03 kg/m2. The air bag 3 is deflated and stored, and is rolled up from the beginning of the air bag 3; the inflation valve 5 is not required to be exposed in the air bag 3 to prevent the air bag 3 from being pierced and the inflation valve 5 from being damaged.

[0012] Before the construction of the elastic expansion joint, the surface of the concrete beam end concrete structure to be constructed shall be inspected and accepted. The surface of the concrete structure shall be compact and uniform, the color shall be uniform, and there shall be no exposed ribs, honeycombs, holes, loose, pockmarks and missing edges. Defects such as corners. In particular, if the surface of the concrete structure is loose and easy to peel off, it should be reworked and reworked. Otherwise, the elastic expansion joint will fall off due to long-term sun and rain, beam expansion and other reasons, resulting in waterproof failure between the joints.

[0013] In the present technical solution, the airbag 3 having a length of not less than 45 cm and a longitudinal length of not less than the length of the beam of the box girder is inflated and used as a mold for molding the auxiliary polyurethane elastomer 4, and functions as a positioning molding. This improves the construction efficiency of the polyurethane elastomer expansion joint.

[0014] Before the construction, the water level gauge is used to measure the top elevation of the water block 2, and the lowest point of the top surface of the concrete structure is found, which is used as the drainage point of the waterproof system in the future.

[0015] The snoring package, the airbag 3 is placed between the beam ends of the beam before being inflated by 4 to 5 people for preliminary placement, and one person is measured to measure the top surface elevation, according to the design requirements of the elastic body "door" type The thinnest part shall not be less than 2/lOxW (W is the measured joint width). After the initial positioning, the airbag 3 beyond the ends of the beam of the box girder shall be fixed on the guardrail by rope.

[0016] The airbag 3 is inflated by the port on the air duct on the air pump 6 docking with the inflation valve 5 on the airbag 3, and when the airbag 3 is slightly in contact with the beam gap, the barometer 7 reading is displayed at 0.18 to 0.2 kg/cm. 2吋, stop the inflation, the worker releases the airbag 3, and the airbag 3 will rely on the inflation to the support of the concrete between the beam 1 and the water stop 2 to support the weight of the beam. In this case, a vertical ruler is placed on the top surface of the airbag 3 to measure the top surface of the arc arch, and the final precise positioning of the airbag 3 is performed.

[0017] The precise positioning method is that when the elevation of the arc dome surface of the airbag 3 is higher than the design elevation, the wooden strip is pressed with 5 _C mx 5 cm; when the elevation of the arc dome of the airbag 3 is lower than that of the airbag 3 Design elevation 吋, using airbag 3 The other end of the inflation valve 5 is deflated, and the worker lifts the airbag 3 again to perform the elevation adjustment.

[0018] The airbag 3 is placed between the end beams of the beam, and the inflation valve 5 should be placed on the top surface of the cut surface to facilitate charging and discharging.

[0019] The barometer 7 has a range of not less than 2 kg/cm 2 ; after the airbag 3 is accurately positioned, the air pressure in the air bag 3 should be in the range of 0.8 to 1.2 kg/cm ² .

[0020] After the airbag 3 is accurately positioned and the inflation air pressure reaches the requirement, a plastic wedge-shaped end lining 8 having a semi-circular lower portion is installed at the beam end, and the end lining 8 is added in the cable slot A wall between the beam gaps, and the outer wrapping is A layer of plastic film is secured by a wedge-shaped block. The block 9 is mounted on the inner side for its plastic positioning function, and the bottom surface thereof is a drainage top surface of the elastic expansion joint of the pseudo-casting body, and the material is a wooden block with a width of 10 cm, a height of 10 cm and a length of 20 cm, and is covered with a plastic film for profit. Demolished.

[0021] The end water retaining block provided at the both ends of the water retaining station 2 of the elastic expansion joint 4 should be poured between the main body of the elastic expansion joint 4 for 30 min to 50 min.

[0022] The plastic film wrapped by the airbag 3 blocks the adhesion of the elastic body 4 and the rubber of the airbag 3, and after the strength of the elastic expansion joint reaches the designed demoulding strength, the gas is vented through the inflation valve 5 at both ends of the airbag 3, and the mold is vented. Naturally shedding, installation and removal are very convenient.

[0023] The utility model utilizes an air bag 3, an inflation valve 5, an air pump 6, a barometer 7, an end lining 8, and a stopper 9, and the air bag is provided with an inflation valve 5; the air pressure gauge 7 is installed on the air pipe of the air pump 6. The airbag 3 is covered with a plastic film; the end liner 8 and the baffle 9 are mounted on the upper part of the airbag and the end of the beam. The purpose of realizing the construction of high-speed railway polyurethane elastomer expansion joints is to simplify the steps of cutting the steps in the existing process and to make the arc-shaped lining difficult, and improve the practicability and work efficiency of the polyurethane elastomer expansion joint construction. Simple, simple structure, safe and fast construction, light weight components, simplified process, less auxiliary materials, saving materials, high work efficiency, practicality, conducive to turnover and back-up, can fundamentally solve the distortion and disassembly of the underlay Difficult, easy to fall, fall off problems.

[0024] The above technical solutions only exemplify the preferred technical solutions of the technical solutions of the present invention, and the changes that may be made by those skilled in the art to some parts thereof embodies the principles of the present invention, and belong to the present invention. Within the scope of protection.

Embodiments of the invention [0025] The description paragraphs of the embodiments of the invention are entered here. Industrial applicability

[0026] Enter the paragraph of industrial applicability description here.

Sequence table free content

[0027] Type the sequence table free content description paragraph here.

Claims

Claim

[Claim 1] A railway bridge polyurethane elastomer expansion joint cast-in-place tooling, comprising: an air bag (3), an inflation valve (5), an air pump (6), a barometer (7), and an end liner (8) ), the stopper (9), the air bag is provided with an inflation valve (5); the air pressure gauge (7) is installed on the air pipe of the air pump (6); the end lining (8) and the baffle plate (9) are installed at the upper part of the air bag , located at the beam end of the beam.