Expansion joint grouting mechanism for preventing beam end garbage blockage

Abstract

The utility model relates to a kind of expansion joint grouting mechanism for preventing beam end garbage blockage, belong to bridge engineering maintenance and repair technical field.The grouting mechanism includes grouting pipe unit and support unit.Grating unit is composed of multiple segments by insertable series pipe body, and the left and right side wall of pipe body is equipped with outflow pipe, and top is equipped with hanger piece.Support unit includes multiple support frame fixed in the bottom of pipe body, and each support frame has the support rod extending to left lower side and right lower side, and the end of support rod is equipped with positioning ring.During construction, grouting chamber is formed by positioning ring binding and tensioning flexible isolation membrane, slurry is sprayed to expansion joint two sides vertical surface from left and right outflow pipe and foamed in chamber, to form a continuous barrier layer in expansion joint top.The utility model structure is simple, and grouting chamber is formed by support unit tensioning flexible isolation membrane, and foamed material is shaped in expansion joint top.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering maintenance and repair technology. Specifically, it relates to an expansion joint grouting mechanism for injecting foamed material into the top of the expansion joint to form a temporary barrier layer of construction waste during the replacement of bridge expansion joints. Background Technology

[0002] Bridge expansion joints are installed at adjacent beam ends or between beam ends and abutments to accommodate beam deformation caused by temperature, load, etc., and to ensure the smoothness of traffic on the bridge deck. These joints are directly exposed to the bridge deck for extended periods, enduring vehicle impacts, abrasion, and environmental erosion from wind, rain, and de-icing salt. They are prone to defects such as steel section breakage, damaged sealing strips, and cracking of the concrete in the anchorage zone, requiring replacement upon failure.

[0003] During the dismantling of old expansion joints, concrete fragments, slag, and other construction waste can easily fall into the expansion joints. Expansion joints typically have a wide transverse width, a narrow opening, and a deep longitudinal width; their transverse length often exceeds ten meters, while their width is only 10-20 centimeters, and their depth can reach 2-3 meters. During bridge operation, this fallen construction waste is compressed, compacted, and hardened by the repeated expansion and contraction of the beam, eventually adhering to the beam ends and blocking the effective gap of the expansion joint. This blockage severely restricts the normal deformation of the beam, leading to concrete crushing and cracking at the beam ends, abnormal damage to the supports, and even unexpected planar displacement of the beam, seriously threatening the structural safety of the bridge.

[0004] To address this issue, a new maintenance technology proposes pre-injecting polyurethane or other foaming materials into the top of the expansion joint (below the opening in the bridge deck) before demolition work to form a continuous physical barrier layer to catch and isolate falling debris. However, how to spray and form the foaming material inside the narrow and deep expansion joint, especially in its top area, is a current technical bottleneck in construction. Therefore, there is an urgent need to develop a specialized grouting mechanism that can penetrate deep into the expansion joint and effectively assist in forming a barrier layer of foaming material at the top of the expansion joint. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a grouting mechanism for expansion joints that prevents debris from clogging beam ends. This mechanism can be inserted into narrow expansion joints and positioned at a preset location on the top of the joint to spray foam material onto both sides of the expansion joint and assist in forming a continuous barrier layer on the top of the expansion joint.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An expansion joint grouting mechanism to prevent debris from clogging beam ends includes a grouting pipe unit and a support unit.

[0008] The grouting pipe unit includes at least one pipe section, and multiple pipe sections can be connected in series to accommodate bridges of different widths. Along its axial direction, the pipe section has multiple left-outlet grouting pipes on its left side wall and multiple right-outlet grouting pipes on its right side wall for spraying foaming material onto the beam end facades on both sides of the expansion joint. The top of the pipe section is equipped with a hanging bracket for connecting to the suspension unit.

[0009] The support unit includes multiple support frames spaced apart along the axial direction of the pipe. Each support frame includes a connecting plate fixed to the bottom of the pipe. A left support rod extends downward to the left from the left side of the connecting plate, with a left positioning ring at its end; a right support rod extends downward to the right from the right side, with a right positioning ring at its end. The left and right positioning rings are used to bind the left and right edges of a flexible isolation membrane (such as geotextile or plastic film) and allow auxiliary ropes to pass through.

[0010] Furthermore, the first end of the tube is provided with an insert tube, and the last end is provided with a sleeve. The outer diameter of the insert tube matches the inner diameter of the sleeve to achieve the insertion and series connection of adjacent tubes. Preferably, the sleeve wall is provided with a sleeve pin hole, and the insert tube wall is provided with a corresponding insert pin hole, which can be fixed by pins to ensure a firm connection.

[0011] Furthermore, the outer periphery of the insertion tube is provided with a positioning protrusion, and the inner wall of the sleeve is provided with a positioning groove that matches the shape of the positioning protrusion. This structure can prevent mistaken alignment and provide circumferential limiting, facilitating quick and accurate alignment and connection by construction personnel.

[0012] Furthermore, an installation platform is provided at the bottom of the pipe along the axial direction, and the connecting plate of the support frame is fixed to the installation platform by bolts or welding, making the installation of the support frame more stable and orderly.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. By connecting multiple pipe sections in series, they can be flexibly assembled into grouting main pipes that can adapt to different bridge widths. They are highly versatile and easy to transport and assemble on site.

[0015] 2. Through multiple slurry outlet pipes set on the left and right sides of the pipe body, foaming material can be evenly sprayed onto the vertical surfaces on both sides of the expansion joint to form a stable barrier layer foundation.

[0016] 3. Through the design of support rods extending to the lower left and lower right and end positioning rings, combined with a flexible isolation membrane and auxiliary ropes, a grouting chamber can be formed under the grouting pipe. This structure effectively reduces the loss of foaming material from the side gaps before expansion and curing, ensuring that the material is concentrated in the predetermined area at the top of the expansion joint for foaming and accumulation.

[0017] 4. The main components of this mechanism are pipes, rods, and ropes. It has a simple structure, is easy to process and manufacture, has low operating costs, and is easy to promote and apply in maintenance and repair projects. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the grouting mechanism.

[0020] Figure 2 This is a schematic diagram of the support frame structure.

[0021] Figure 3 This is a schematic diagram of the structure at the beginning of the grouting pipe unit.

[0022] Figure 4 This is a schematic diagram of the tail end structure of the grouting pipe unit.

[0023] Explanation of the labels in the diagram:

[0024] 1. Pipe body; 11. Left slurry outlet pipe; 12. Right slurry outlet pipe; 13. Hanging components; 14. Installation platform;

[0025] 2. Support frame; 21. Connecting plate; 22. Left support rod; 23. Left positioning ring; 24. Right support rod; 25. Right positioning ring;

[0026] 7. Insertion tube; 71. Insertion tube pin hole; 72. Positioning protrusion;

[0027] 8. Sleeve; 81. Sleeve pin hole; 82. Positioning groove;

[0028] 9. Pins. Detailed Implementation

[0029] like Figures 1 to 4 As shown, an expansion joint grouting mechanism to prevent debris from clogging the beam end functions to assist in spraying and forming a continuous barrier layer of two-component foamed material such as polyurethane in the top area of ​​the bridge expansion joint (below the old expansion device).

[0030] The grouting mechanism consists of a grouting pipe unit and a support unit. The grouting pipe unit comprises several standard-length pipe sections 1. Each pipe section 1 is a straight pipe, with multiple left-outlet grouting pipes 11 spaced axially along its left side wall and multiple right-outlet grouting pipes 12 correspondingly spaced along its right side wall. A lifting ring (or hook) is welded to the top of the pipe section 1 as a hanging element 13. A longitudinal installation platform 14 is welded to the bottom of the pipe section 1. One end of the pipe section 1 is an insert pipe 7, and the other end is a sleeve pipe 8.

[0031] The outer diameter of the insertion tube 7 and the inner diameter of the sleeve 8 are tightly fitted to each other. The outer wall of the insertion tube 7 has a radially penetrating insertion pin hole 71 and a strip-shaped positioning protrusion 72. The sleeve 8 has a corresponding sleeve pin hole 81 on its wall and a positioning groove 82 on its inner wall that matches the positioning protrusion 72. During assembly, the insertion tube 7 of one section of the tube body 1 is aligned with the sleeve 8 of the other section of the tube body 1 and inserted. The positioning protrusion 72 and the positioning groove 82 are used to ensure angular alignment. Then, the pin 9 is simultaneously inserted into the aligned insertion pin hole 71 and sleeve pin hole 81 and locked, thus completing the quick and secure connection of the two sections of the tube body 1. According to the transverse width of the bridge, a sufficient number of tube bodies 1 are connected in series until the total length is slightly less than the width of the bridge.

[0032] The support unit comprises multiple support frames 2. Each support frame 2 is welded together from a connecting plate 21, a left support rod 22 extending downward to the left, and a right support rod 24 extending downward to the right. A left positioning ring 23 and a right positioning ring 25 are welded to the ends of the left support rod 22 and right support rod 24, respectively. The connecting plate 21 is bolted to the mounting platform 14 at the bottom of the tube body 1, and the multiple support frames 2 are evenly distributed along the axial direction of the tube body 1. This downward-sloping structural design ensures that the final suspension position of the left and right positioning rings (23, 25) is lower than the bottom of the tube body 1, providing support for the deployment of the flexible isolation membrane.

[0033] The construction method in this embodiment is as follows:

[0034] Preparation: First, pass the main rope through the expansion joint and tighten and fix both ends on the bridge deck so that the main rope is suspended and positioned at the preset grouting height at the top of the expansion joint.

[0035] Cut a piece of geotextile (or plastic film) as a flexible isolation membrane based on the width of the expansion joint and the bridge deck. Depending on construction convenience, the geotextile can be tied and fixed to the support frame 2 either as a whole or in sections. Specifically, the left side of the geotextile is tied and fixed to the left positioning ring 23 in sequence, and the right side of the geotextile is tied and fixed to the right positioning ring 25 in sequence. Then, the left auxiliary rope is passed through all the left positioning rings 23 in sequence, and the right auxiliary rope is passed through all the right positioning rings 25 in sequence.

[0036] There are two preferred methods for hoisting the grouting mechanism into the expansion joint:

[0037] Method 1 (Integral Insertion): After assembling all the pipe bodies 1 in series on the bridge deck and binding the flexible isolation membrane to the support frame 2, the construction personnel place the assembled pipe body 1 on the side of the bridge. Then, they hang it sequentially on the taut main rope through the hanging parts 13 at the top and push the pipe body 1 to slide along the main rope, thereby smoothly inserting the entire grouting mechanism into the expansion joint 10 from the side of the bridge until it is fully inserted into the expansion joint.

[0038] Method 2 (Segmented Input): Considering that the assembled mechanism may be quite long, making side input inconvenient, a segmented input method can be used. First, suspend the first segment of tube 1 with support frame 2 (the corresponding segment of the flexible isolation membrane is already tied to the support frame) on the main rope and partially push it into the expansion joint. Then, connect and lock the second segment of tube 1 to the first segment of tube 1 through the cooperation of the insertion tube 7 and the sleeve 8, and tie the corresponding segment of the flexible isolation membrane to the support frame 2 of the second segment of tube 1. Subsequently, push the second segment of tube 1 and the corresponding segment of the flexible isolation membrane partially into the expansion joint. Repeat this process until all tubes 1 are inserted into the expansion joint.

[0039] Unfolding the isolation membrane: After the entire structure is in place, tighten both ends of the left auxiliary rope and bring it close to the end face of the left beam (at this time, the left support rod 22 bends under force, causing the left end of the geotextile to be close to the end face of the beam). Then, fix both ends of the left auxiliary rope to the end face of the left beam or a suitable anchor point. Similarly, tighten both ends of the right auxiliary rope and bring it close to the end face of the right beam (at this time, the right support rod 24 bends under force, causing the right end of the geotextile to be close to the end face of the beam). Then, fix both ends of the right auxiliary rope to the end face of the right beam or a suitable anchor point. By tightening the left and right auxiliary ropes and bringing them close to the end face of the beam, the geotextile (with its edges close to the beam end faces on both sides of the expansion joint) forms a bottom pocket at the bottom of the pipe 1, thereby forming a grouting chamber at the top of the expansion joint.

[0040] Grouting and Forming: Connect the foaming spraying equipment to the inlet of pipe body 1. Start the equipment and pump the mixed polyurethane grout into pipe body 1. Under pressure, the grout is simultaneously sprayed from the left grout outlet pipe 11 and the right grout outlet pipe 12, coating the vertical surfaces of the beam ends on both sides. Due to the bottoming effect of the geotextile, the grout and foam are confined within the cavity, thus forming a foamed barrier layer that bonds well with the beam at the top of the expansion joint.

[0041] The above embodiments do not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A grouting mechanism for expansion joints to prevent debris from clogging beam ends, characterized in that, include: The grouting pipe unit includes one or more pipe bodies (1) connected in series. Along its axial direction, the pipe body (1) has multiple left grout outlet pipes (11) on its left side wall and multiple right grout outlet pipes (12) on its right side wall. The top of the pipe body (1) is provided with a hanging device (13). The support unit includes multiple support frames (2) spaced apart along the axial direction of the tube body (1); each support frame (2) includes a connecting plate (21) fixed to the bottom of the tube body (1); a left support rod (22) is provided on the left side of the connecting plate (21) extending downward to the left, and a left positioning ring (23) is provided at the end of the left support rod (22); a right support rod (24) is provided on the right side extending downward to the right, and a right positioning ring (25) is provided at the end of the right support rod (24).

2. The expansion joint grouting mechanism for preventing debris blockage at beam ends according to claim 1, characterized in that: The tube body (1) is provided with an insertion tube (7) at the first end and a sleeve (8) at the last end. The outer diameter of the insertion tube (7) matches the inner diameter of the sleeve (8).

3. The expansion joint grouting mechanism for preventing debris blockage at beam ends according to claim 2, characterized in that: The sleeve (8) has a sleeve pin hole (81) through which the pin (9) passes, and the insertion tube (7) has a corresponding insertion pin hole (71) on its wall.

4. The expansion joint grouting mechanism for preventing debris blockage at beam ends according to claim 2, characterized in that: The outer periphery of the insertion tube (7) is provided with a positioning protrusion (72), and the inner wall of the sleeve (8) is provided with a positioning groove (82) that matches the shape of the positioning protrusion (72).

5. The expansion joint grouting mechanism for preventing debris blockage at beam ends according to claim 1, characterized in that: The bottom of the tube (1) is provided with an installation platform (14) along the axial direction, and the connecting plate (21) of the support frame (2) is fixed on the installation platform (14).

6. The expansion joint grouting mechanism for preventing debris blockage at beam ends according to claim 5, characterized in that: The connecting plate (21) is fixed to the mounting platform (14) by bolt fastening or welding.

Images