Auxiliary device for replacing damaged beam body of existing railway line and construction method

Abstract

The invention relates to the technical field of damaged beam body replacement, in particular to an auxiliary device for replacing a damaged beam body of an existing railway line and a construction method. The auxiliary device is fixed to the peripheral side of a bridge pier, is used for prolonging the length of a bent cap ear wall on the upper side of the bridge pier and comprises two hoops surrounding the peripheral side of the bridge pier and an extension support arranged on at least one hoop, and the upper end face of the extension support is flush with the top end of the bent cap ear wall. By means of the auxiliary device, rapid, safe and effective beam body replacement construction, application of a supporting device and application of a construction method are achieved, the construction difficulty and delay caused by environmental factors are reduced, the construction smoothness and efficiency are improved, replacement of a damaged beam body can be completed within a short time, and the construction period is shortened. Powerful support is provided for rapid repair and safe operation of the railway bridge, and good economic benefits and social benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of replacing defective beams, and in particular to an auxiliary device and a construction method for replacing defective beams on existing railway lines. Background Art

[0002] Railway bridges, after long-term use and erosion by saline-alkali environments, can suffer from various levels of concrete cracking, falling blocks, and exposed rebar damage, posing a serious threat to railway safety. This necessitates beam replacement. When a bridge spans a river, flanked by fish ponds or salt ponds, with muddy ground beneath the bridge, and narrow, winding roads around the bridge site, crane-mounted beam erection is impractical and requires a bridge erection machine.

[0003] When the curve radius of the bridge is small, the bridge-building machine is very likely to overturn when passing through the hole, affecting construction safety. The current common solution is to erect steel support columns on both sides of the pier for auxiliary support. When the bridge crosses a river and there are fish ponds or salt ponds on both sides, and the ground under the bridge is in silt, this method cannot achieve auxiliary support. Even if the bridge is in other environments suitable for support, it will affect traffic under the bridge.

[0004] Therefore, there is an urgent need for an auxiliary device and construction method for replacing defective beams on existing railway lines that can quickly, safely and effectively complete beam replacement construction, minimize the impact on operating lines, and ensure the safety of operating line construction. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an auxiliary device and a construction method for replacing a diseased beam on an existing railway line, so as to solve the problems involved in the background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an auxiliary device for replacing defective beams on existing railway lines, the auxiliary device being fixed to the outer periphery of a bridge pier and used to extend the length of the cap beam ear wall on the upper side of the pier, comprising two clamps enclosed on the outer periphery of the pier, and an extension support provided on at least one of the clamps, wherein the upper end surface of the extension support is flush with the top end of the cap beam ear wall.

[0007] Furthermore, the extended support is arranged at the top of the hoop, and a support beam is provided between the hoop and the extended support, and the support beam is vertically fixed to the extended support.

[0008] Furthermore, a temporary locking structure is provided between the two hoops;

[0009] The temporary locking structure includes a bolt ear plate fixed on the clamping hoop and a bolt arranged between the bolt ear plates on two clamping hoops.

[0010] Furthermore, the clamp is provided with a plurality of reserved holes, and shear nails are provided in the reserved holes for fixing the clamp to the pier.

[0011] Furthermore, a gap is provided between the hoop and the pier, and the gap is filled with concrete.

[0012] Furthermore, the extended support includes a supporting part and an extension part. The supporting part is connected to the hoop, and the shape of the supporting part fits the outer contour of the cap beam ear wall. The extension part is flush with the upper end surface of the cap beam ear wall and is used to extend the length of the cap beam ear wall.

[0013] Construction method of auxiliary device for replacing defective beams on existing railway lines,

[0014] (1) Fix the auxiliary device on the outer periphery of the pier of the bridge with a small curve radius;

[0015] (2) Transport the bridge erection machine to the bridge head through-hole;

[0016] (3) The bridge erection machine passes through the hole to remove the old beam and erect the new beam;

[0017] (4) When replacing the beam of a bridge with a small curve radius, use auxiliary devices to extend the length of the cap beam ear wall to prevent the bridge erection machine from tipping over.

[0018] Furthermore, the detailed steps of (1) include:

[0019] Enclose the two clamps on the top of the pier so that the extended part of the extended support is flush with the cap beam ear wall, fix the bolt ear plate of the clamp with bolts, drive the shear nails into the reserved holes to fix the clamp to the pier, and fill the gap between the pier and the clamp with concrete for reinforcement.

[0020] Furthermore, the detailed steps of (3) include:

[0021] The bridge-erecting machine passes the 1st and 2nd holes, and carries out the demolition of the old bridges at the 1st and 2nd holes. The dismantled old beams are transported out, and the new beams are transported to the construction site. The erection of the new T-beams at the 1st hole is carried out. After the erection of the new beams is completed, the horizontal connection of the bridge is immediately carried out. Then the bridge-erecting machine passes the 3rd hole. After passing the hole, a temporary line is laid above the new beams at the 1st hole. Then the old beams at the 3rd hole are demolished, and the new beams at the 5th hole are erected. The subsequent steps are carried out according to the steps of "passing 1 hole, demolishing 1 hole, and erecting 1 hole" until the erection is completed.

[0022] Furthermore, the detailed steps of (4) include:

[0023] When replacing the beam of a bridge with a small curve radius, the front transverse track of the bridge-erecting machine first passes through the hole and is placed at the extension of the cover beam ear wall and the extended support. After the front transverse track is placed stably, the front support leg is moved laterally toward the cover ear wall, and the rear support leg is moved in the opposite direction to complete the steering of the bridge-erecting machine.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention minimizes the impact on operating lines, avoids the obstruction of underbridge traffic caused by auxiliary supports in traditional methods, eliminates the need to interrupt operating line transportation for a long time, and can efficiently complete beam replacement construction within a limited blockade time, shortening the construction period, reducing the interference of construction on railway operations, and effectively ensuring the normal order of railway transportation.

[0026] Through auxiliary devices, fast, safe and effective beam replacement construction is achieved. The application of support devices and construction methods reduces construction difficulties and delays caused by environmental factors, improves the smoothness and efficiency of construction, and can complete the replacement of diseased beams in a shorter time, providing strong support for the rapid repair and safe operation of railway bridges, with good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the main structure of the auxiliary device according to embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic top view of the auxiliary device according to embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the main structure of a bridge erection machine and a cap beam ear wall for replacing the beam of a bridge with a small curve radius in the prior art;

[0030] Figure 4 This is a schematic diagram of the main structure of a bridge erection machine and a cap beam ear wall for replacing the beam of a bridge with a small curve radius according to Example 1 of the present invention;

[0031] In the picture:

[0032] Bridge pier 1, cap beam ear wall 2, hoop 3, extended support 4, support part 41, extension part 42, bolt ear plate 5, bolt 6, shear nail 7, front transverse track 8, front support leg 9, bridge erection machine 10, support beam 11. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Example:

[0035] Depend on Figure 1-4As shown, the auxiliary device is used for replacing the diseased beam body of the existing railway line. The auxiliary device is fixed on the outer peripheral side of the pier 1 and is used to extend the length of the cap beam ear wall 2 on the upper side of the pier 1. It includes two clamps 3 enclosed on the outer peripheral side of the pier 1, and an extension support 4 provided on at least one of the clamps 3. The upper end surface of the extension support 4 is flush with the top end of the cap beam ear wall 2.

[0036] The extension support 4 is provided at the top of the hoop 3, with a joist 11 provided between the hoop 3 and the extension support 4. The joist 11 is vertically fixed to the extension support 4. The extension support 4 includes a support portion 41 and an extension portion 42. The support portion 41 is connected to the hoop 3, and its shape conforms to the outer contour of the cap beam ear wall 2. The extension portion 42 is flush with the upper end surface of the cap beam ear wall 2, and is used to extend the length of the cap beam ear wall 2.

[0037] A temporary locking structure is provided between the two clamps 3; this structure includes bolt lugs 5 fixed to the clamps and bolts 6 located between the bolt lugs 5 on the two clamps 3. The clamps 3 are provided with several pre-set holes, each containing shear pins 7 for securing the clamps 3 to the pier 1. A gap is provided between the clamps 3 and the pier 1, which is filled with concrete.

[0038] Construction method of auxiliary device for replacing defective beams on existing railway lines,

[0039] (1) Fix the auxiliary device on the outer periphery of the pier of the bridge with a small curve radius:

[0040] Enclose the two hoops 3 on the top of the pier 1, so that the extended part 42 of the extended support 4 is flush with the cap beam ear wall 2, fix the bolt ear plate 5 of the hoop 3 with bolts 6, drive the shear nails 7 into the reserved holes to fix the hoop 3 to the pier 1, and fill the gap between the pier 1 and the hoop 3 with concrete for reinforcement.

[0041] (2) Transport the bridge erection machine to the bridge head through-hole:

[0042] (3) The bridge erection machine passes through the hole to remove the old beam and erect the new beam:

[0043] The bridge-erecting machine passes the 5th and 6th holes, and dismantles the old bridges at the 5th and 6th holes. The dismantled old beams are transported out, and the new beams are transported to the construction site. The erection of the new T-beam at the 6th hole is carried out. After the erection of the new beam is completed, the bridge is immediately connected horizontally. Then the bridge-erecting machine passes the 4th hole. After passing the hole, a temporary line is laid above the new beam at the 6th hole. Then the old beam at the 4th hole is dismantled, and the new beam at the 5th hole is erected. The subsequent steps are carried out according to the steps of "passing 1 hole, dismantling 1 hole, and erecting 1 hole" until the erection is completed.

[0044] 1. Testing, dismantling and transportation of old beams

[0045] Due to the serious deformation at both ends of the old bridge, the beam ends are all stuck and the gap is small. First, the old beam is tied with steel wire ropes, and then four 50t jacks are placed on the end partitions on both sides of the old beam. Steel plates are placed on the jacks, and the end partitions are slowly lifted synchronously. The beam is lifted after it is completely separated from the support. Due to the serious aging of the beam, a beam guard steel plate is placed at the rope binding position of the old beam bottom plate. After the beam is lifted, it is placed on the trolley waiting behind the bridge erection machine and transported after the reinforcement is completed.

[0046] 2. Remove existing pad stones and supports

[0047] After the old beams are dismantled, the elevation of the existing pad stones is measured. Use a jackhammer and an electric hammer to chisel off the old pad stones and the surrounding area. After the support bolts are exposed, use an air cutter to cut them off. Stop chiseling after chiseling to the designed elevation of the leveling mortar bottom and meeting the size of the steel pad stone base plate. The dry hard mortar leveling layer is controlled at 2.5cm.

[0048] 3. Installation of steel pads and supports

[0049] Use grouting material to fill the steel pad stone densely in advance. After the pier cap is chiseled to the designed elevation, mark out the center of the steel pad stone and the embedded bolts, and use a high-power water drill to drill holes. The diameter of the hole is 11cm and the depth is ≥38cm. After the drilling is completed, lay dry hard mortar on the top of the existing concrete for leveling. After leveling, install the steel pad stone and embedded bolts, and mark out and check the elevation of the steel pad stone again to ensure that the center coordinates and elevation deviations are no more than 2mm. Place the support on the top of the steel pad stone, and finally grout the anchor hole and the surrounding area of ​​the steel pad stone.

[0050] 4. Transportation and erection of new beams

[0051] The new beams are fed directly from the crane to the bridge erection machine to complete the new beam erection. To prevent the wire rope from damaging the corners of the beam bottom plate during the beam hoisting process, 8 sets of steel corner guards are processed.

[0052] During the placement of the new beam, the position should be constantly adjusted to ensure that the bolts on the supports can be installed. The support alignment should be based on the cross line of the pad stone. The support position should not be adjusted. Tighten the upper steel plate bolts to connect the support to the beam body as a whole.

[0053] After the beam is dropped, check the status of both ends of the beam. After ensuring that the center line of the beam, the width of the beam seam, and the verticality are correct, weld the supports to the steel pad stone to complete the beam drop. After the beam is erected, use jacks and logs for temporary support and reinforcement.

[0054] 5. Horizontal connection of beams

[0055] After the new beams are erected, the transverse connection of the bridge will be carried out immediately, mainly welding the cross-diaphragm connecting steel plates, and the welds must be full and continuous; the prestressed steel bars are temporarily tightened and connected, the cross-diaphragm support formwork is erected, and C55 fine stone concrete is poured.

[0056] 6. Temporary line laying

[0057] A wheel-rail beam transporter was used to remove and transport the old beams and install the new T-beams. Therefore, after each pass of the bridge-erecting machine, a temporary track was laid behind the machine to accommodate the operation of the beam transporter. Based on the rail sawing points and the support positions of the bridge-erecting machine's middle legs, track calculations were performed in advance, and four 12.5-meter Type 50 tool rails were installed, connected to the wheel guard rails, to serve as temporary tracks.

[0058] Temporary track is laid from the sixth hole to the third hole. After each hole the bridge-erecting crane passes, a layer of ballast is laid on the beam surface behind the center leg, and sleepers and temporary tool rails are installed. During the beam erection process, temporary track (approximately 16-20 meters) is laid each time the bridge-erecting crane passes each hole, for a total of four times. Holes 1 and 2 do not involve the traveling bridge-erecting crane or beam-carrying platform, so temporary track does not need to be laid.

[0059] (4) When replacing the beam of a bridge with a small curve radius, use auxiliary devices to extend the length of the cap beam ear wall to prevent the bridge erection machine from tipping over:

[0060] When replacing the beam of a bridge with a small curve radius, the front transverse track 8 of the bridge-building machine 10 first passes through the hole and is placed at the position of the cover beam ear wall 2 and the extension 42 of the extended support 4. After the front transverse track 8 is placed stably, the front support leg 9 is moved laterally toward the cover ear wall 2, and the rear support leg is moved in the opposite direction to complete the turning of the bridge-building machine.

[0061] The connecting lines of the beams at the small curve radius bridge are arcs, not straight lines. When the bridge erection machine moves forward through the hole, it cannot complete the steering at the same time. It is necessary to complete the forward movement and place the front transverse track 8 on the cap beam ear wall 2 before the front legs 9 and rear legs of the bridge erection machine 10 can move in the opposite direction to achieve steering. Figure 3 In the middle, when the curve radius is too small, the front transverse track 8 cannot be completely placed on the cap beam ear wall 2, and point A is in a suspended position. The bridge erection machine is very likely to roll over due to the shift of the center of gravity; Figure 4 After using the auxiliary device for this application, the transverse track 8 can be completely placed on the cap beam ear wall 2 and the auxiliary device, avoiding the occurrence of hanging conditions and ensuring construction safety.

[0062] After the construction is completed, the extension portion 42 of the extension support 4 can be removed, and the remaining support portion 41 can increase the support area of ​​the pier 1 and assist the pier 1 in supporting the bridge.

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for replacing a damaged beam on an existing railway line, characterized by: The auxiliary device is fixed on the outer periphery of the pier and is used to extend the length of the cap beam ear wall on the upper side of the pier. It includes two hoops enclosed on the outer periphery of the pier and an extension support provided on at least one of the hoops. The upper end surface of the extension support is flush with the top end of the cap beam ear wall.

2. The auxiliary device for replacing a defective beam on an existing railway line according to claim 1 is characterized in that: The extended support is arranged on the top of the hoop, and a support beam is provided between the hoop and the extended support, and the support beam is vertically fixed to the extended support.

3. The auxiliary device for replacing a defective beam on an existing railway line according to claim 1 is characterized in that: A temporary locking structure is provided between the two hoops; The temporary locking structure includes a bolt ear plate fixed on the clamping hoop and a bolt arranged between the bolt ear plates on two clamping hoops.

4. The auxiliary device for replacing a damaged beam on an existing railway line according to claim 1 is characterized in that: The clamp is provided with a plurality of reserved holes, and shear nails are provided in the reserved holes for fixing the clamp to the bridge pier.

5. The auxiliary device for replacing a damaged beam on an existing railway line according to claim 1 is characterized in that: A gap is provided between the hoop and the pier, and the gap is filled with concrete.

6. The auxiliary device for replacing a defective beam on an existing railway line according to claim 1 is characterized in that: The extended support includes a supporting part and an extending part. The supporting part is connected to the hoop, and the shape of the supporting part fits the outer contour of the cap beam ear wall. The extending part is flush with the upper end surface of the cap beam ear wall and is used to extend the length of the cap beam ear wall.

7. The construction method of the auxiliary device for replacing a defective beam on an existing railway line according to any one of claims 1 to 6, characterized in that: (1) Fix the auxiliary device on the outer periphery of the pier of the bridge with a small curve radius; (2) Transport the bridge erection machine to the bridge head through-hole; (3) The bridge erection machine passes through the hole to remove the old beam and erect the new beam; (4) When replacing the beam of a bridge with a small curve radius, use auxiliary devices to extend the length of the cap beam ear wall to prevent the bridge erection machine from tipping over.

8. The construction method for replacing a damaged beam on an existing railway line according to claim 7, characterized in that: The detailed steps of (1) include: Enclose the two clamps on the top of the pier so that the extended part of the extended support is flush with the cap beam ear wall, fix the bolt ear plate of the clamp with bolts, drive the shear nails into the reserved holes to fix the clamp to the pier, and fill the gap between the pier and the clamp with concrete for reinforcement.

9. The construction method for replacing a damaged beam on an existing railway line according to claim 7, characterized in that: The detailed steps of (3) include: The bridge-erecting machine passes the 1st and 2nd holes, and carries out the demolition of the old bridges at the 1st and 2nd holes. The dismantled old beams are transported out, and the new beams are transported to the construction site. The erection of the new T-beam of the 1st hole is carried out. After the erection of the new beam is completed, the horizontal connection of the bridge is immediately carried out. Then the bridge-erecting machine passes the 3rd hole. After passing the hole, a temporary line is laid above the new beam of the 1st hole. Then the old beam of the 3rd hole is dismantled, and the new beam of the 2nd hole is erected. The subsequent steps are carried out according to the steps of "passing 1 hole, demolishing 1 hole, and erecting 1 hole" until the erection is completed.

10. The construction method for replacing a damaged beam on an existing railway line according to claim 7, characterized in that: The detailed steps of (4) include: When replacing the beam of a bridge with a small curve radius, the front transverse track of the bridge-erecting machine first passes through the hole and is placed at the extension of the cover beam ear wall and the extended support. After the front transverse track is placed stably, the front support leg is moved laterally toward the cover ear wall, and the rear support leg is moved in the opposite direction to complete the steering of the bridge-erecting machine.

Images