Bridge crack minimally invasive grouting reinforcement and repair device and method

Abstract

This invention discloses a minimally invasive grouting reinforcement and repair device for bridge cracks, comprising: a grouting machine, a positioning block, a grouting needle, a clamping block, fasteners, and an elastic element. The grouting machine has a grouting pipe; the positioning block has a first groove and a through hole, the first groove extending horizontally and the through hole extending vertically and communicating with the first groove, the positioning block covering the opening of the grouting hole to reduce grout leakage; the grouting needle is slidably connected to the through hole, and the top of the grouting needle is connected to the grouting pipe; the clamping block is slidably connected to the first groove, and the clamping block can lock or unlock the grouting needle; the fastener is movably inserted through the side wall of the positioning block, one end of the fastener extending horizontally into the first groove and used to press the clamping block, thus limiting the horizontal position of the clamping block in the groove; the elastic element is located in the first groove, one end of the elastic element connected to the positioning block, and the other end of the elastic element connected to the clamping block, so that the clamping block has a tendency to move away from the grouting needle. It is suitable for bridge cracks of different depths.

Description

Technical Field

[0001] This invention relates to the field of bridge repair equipment technology, and in particular to a device and method for minimally invasive grouting reinforcement and repair of bridge cracks. Background Technology

[0002] With the continuous improvement of my country's road traffic infrastructure construction system, the service scale of various concrete bridges continues to expand. Under the combined effects of long-term vehicle loads, environmental temperature changes, rainwater erosion, and material aging, bridge beam structures are prone to developing cracks of different specifications and depths. A minimally invasive grouting reinforcement and repair device and method for bridge cracks is currently the mainstream minimally invasive repair technology for concrete bridge crack treatment. It mainly relies on grouting equipment to inject high-strength repair grout under pressure into the bridge cracks. The grout's curing and bonding properties are used to bond the cracked substrate and fill the internal cavity of the crack, achieving crack sealing and structural reinforcement. This technology has advantages such as minimal construction disturbance, simple operation process, low repair cost, and minimal impact on bridge traffic. It is widely used in the repair of various bridge cracks, including shallow surface cracks, intermediate through cracks, and deep through cracks, and is a key construction technology to ensure the safety and durability of bridge structures.

[0003] Existing minimally invasive grouting reinforcement and repair devices and methods for bridge cracks mostly use grouting pipes of fixed length, and the grouting insertion depth cannot be flexibly adjusted. In actual construction, it is difficult to adapt to the different crack conditions of shallow, medium and deep cracks. When dealing with shallow cracks, the fixed-length grouting pipe is easy to be inserted too deeply, disturbing the original matrix structure of the crack, causing crack widening and surface grout leakage. When dealing with deep penetrating cracks, the grouting pipe is inserted too deeply, and the grout only accumulates on the surface of the crack. Voids are easily formed in the deep part of the crack, resulting in incomplete filling and incomplete reinforcement.

[0004] In other words, the existing bridge crack minimally invasive grouting reinforcement and repair devices and methods are not suitable for bridge cracks of different depths. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a device and method for minimally invasive grouting reinforcement and repair of bridge cracks, which is applicable to bridge cracks of different depths.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides a minimally invasive grouting reinforcement and repair device for bridge cracks, comprising:

[0008] Grouting machine, the grouting machine having a grouting pipe;

[0009] The positioning block is provided with a first groove and a through hole. The first groove extends in a horizontal direction, and the through hole extends in a vertical direction and communicates with the first groove. The positioning block is used to cover the opening of the grouting hole to reduce grout leakage.

[0010] Grouting needle, the grouting needle being slidably connected to the through hole, and the top of the grouting needle being connected to the grouting pipe;

[0011] A clamping block is slidably connected to the first slide groove, and the clamping block can lock or unlock the grouting needle;

[0012] A fastener, which is movably disposed on the side wall of the positioning block, wherein one end of the fastener extends horizontally into the first groove and is used to press the clamping block to limit the horizontal position of the clamping block in the first groove;

[0013] An elastic element is located within the first groove. One end of the elastic element is connected to the positioning block, and the other end of the elastic element is connected to the clamping block, so that the clamping block tends to move away from the grouting needle.

[0014] Furthermore, the bridge crack minimally invasive grouting reinforcement and repair device also includes a fixing block, the bottom of which is provided with a second sliding groove, the second sliding groove extending along the length direction of the fixing block;

[0015] The fixing block is also provided with a third sliding groove, which is located on the top of the fixing block and extends along the length of the fixing block. The third sliding groove is connected to the second sliding groove, and the grouting needle passes through the third sliding groove and can move along the length of the third sliding groove.

[0016] The positioning blocks are provided in multiple ways, and each of the multiple positioning blocks is slidably connected to the second sliding groove. The multiple positioning blocks are distributed at intervals along the length direction of the fixed block. Each of the multiple positioning blocks is equipped with at least one grouting needle, a clamping block, a fastener, and an elastic element.

[0017] Furthermore, the bridge crack minimally invasive grouting reinforcement and repair device also includes a handcart, and the grouting machine is installed on the handcart.

[0018] Furthermore, the handcart is equipped with a first lifting mechanism, which drives and connects to the fixed block. The first lifting mechanism is used to control the fixed block to move closer to or further away from the grouting hole.

[0019] Furthermore, the first lifting mechanism includes a handwheel, a lead screw, and a slider. A fourth slide groove is provided on one side of the handcart, the fourth slide groove extends vertically, the slider is slidably connected to the fourth slide groove, the slider is connected to the fixed block, the lead screw is pivotally connected to the handcart and screwed to the slider, the lead screw extends vertically, the handwheel is connected to one end of the lead screw, and the handwheel is used to drive the lead screw to rotate.

[0020] Furthermore, the fixing block is also provided with a fifth sliding groove, which is located on the side wall of the fixing block and extends along the length direction of the fixing block. The fifth sliding groove is connected to the second sliding groove, and the fastener passes through the fifth sliding groove and can move along the length direction of the fifth sliding groove.

[0021] Furthermore, the handcart is equipped with a second lifting mechanism, and the bridge crack minimally invasive grouting reinforcement and repair device also includes a drilling machine. The second lifting mechanism is connected to the drilling machine and is used to control the drilling machine to move closer to or away from the ground.

[0022] Furthermore, the grouting pipe includes a first pipe, a multi-port pipe, and a plurality of second pipes. The first pipe is connected to the plurality of second pipes through the multi-port pipe, and the plurality of second pipes are respectively connected to the corresponding grouting needles.

[0023] Furthermore, the handcart is equipped with a vacuum cleaner, which is used to suck out gravel and dust from the grouting holes.

[0024] Secondly, the present invention provides a method for minimally invasive grouting reinforcement and repair of bridge cracks using a bridge crack minimally invasive grouting reinforcement and repair device, comprising:

[0025] The first step is to use tools to machine the grouting holes;

[0026] The second step is to place the positioning block over the grouting hole, and align the through hole with the grouting hole;

[0027] The third step is to connect the grouting needle to the grouting pipe of the grouting machine, and to insert the grouting needle into the grouting hole along the through hole;

[0028] Fourth step: When the grouting needle is inserted to a preset depth, adjust the fastener to push the clamping block to slide along the first groove and get closer to the grouting needle, and lock the grouting needle;

[0029] The fifth step is to start the grouting machine to grout the cracks in the bridge.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. Based on the grouting machine having a grouting pipe, the positioning block is equipped with a first groove and a through hole. The first groove extends horizontally, and the through hole extends vertically and connects to the first groove. The positioning block is used to cover the opening of the grouting hole to reduce grout leakage. The grouting needle slides through the through hole, and the top of the grouting needle is connected to the grouting pipe. Since the grouting needle can slide freely vertically within the through hole, the operator can arbitrarily adjust the insertion depth of the grouting needle according to the actual depth of the bridge crack. This allows the same device to be applicable to different grouting needs for shallow, medium, and deep cracks, solving the problem that existing devices cannot adapt to cracks of varying depths due to fixed needle depth or limited adjustment range. Simultaneously, the positioning block covering the grouting hole opening effectively reduces grout leakage from the hole during grouting, ensuring the sealing of the hole opening at different grouting depths and preventing grout overflow caused by pressure fluctuations due to depth changes. This ensures that the grout can be smoothly injected into the depths of the crack along the needle.

[0032] 2. Based on the sliding connection of the clamping block to the first sliding groove, the clamping block can lock or unlock the grouting needle. A fastener is movably inserted through the side wall of the positioning block, with one end extending horizontally into the first sliding groove to press the clamping block, thus limiting the horizontal position of the clamping block within the groove. When the grouting needle is adjusted to the desired depth, rotating the fastener pushes the clamping block towards the grouting needle and presses it in place, reliably locking the grouting needle at that depth. Because the fastener and the side wall of the positioning block are threaded together, they have a self-locking characteristic. Even under the counterforce of the grouting pressure during the grouting process, the grouting needle will not slip upwards or shift in depth. This ensures that regardless of changes in crack depth, the grouting needle can be stably locked at the preset depth, avoiding the problem of poor grout injection due to needle withdrawal or loosening.

[0033] 3. Based on the elastic element being located within the first sliding groove, one end of the elastic element is connected to a positioning block, and the other end is connected to a clamping block, giving the clamping block a tendency to move away from the grouting needle. When the needle depth needs to be adjusted or the hole needs to be moved to a different depth after grouting a hole, simply loosen the fastener, and the elastic force of the elastic element will automatically push the clamping block away from the grouting needle, immediately releasing the lock. This design avoids the clamping block remaining in the locked position due to friction or jamming after the fastener is loosened, preventing the grouting needle from sliding or being pulled out smoothly. The active reset function of the elastic element makes depth switching operations convenient and significantly improves work efficiency. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a minimally invasive grouting reinforcement and repair device for bridge cracks according to the present invention;

[0035] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0036] Figure 3 for Figure 1 Enlarged view of point A;

[0037] Figure 4 for Figure 2 Enlarged view of point B.

[0038] In the diagram: 1. Grouting machine; 101. Grouting pipe; 1011. First pipe; 1012. Multi-port pipe; 1013. Second pipe; 2. Positioning block; 201. First sluice; 202. Through hole; 3. Grouting needle; 4. Clamping block; 5. Fastener; 6. Elastic element; 7. Fixing block; 701. Second sluice; 702. Third sluice; 703. Fifth sluice; 8. Handcart; 801. First lifting mechanism; 8011. Handwheel; 8012. Lead screw; 8013. Slider; 802. Fourth sluice; 803. Second lifting mechanism; 9. Drilling machine; 10. Vacuum cleaner. Detailed Implementation

[0039] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0040] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0041] Unless otherwise defined, 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 invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] See Figures 1-4 In a first aspect, a preferred embodiment of the present invention provides a bridge crack minimally invasive grouting reinforcement and repair device, comprising a grouting machine 1, a positioning block 2, a grouting needle 3, a clamping block 4, a fastener 5, and an elastic element 6.

[0043] The grouting machine 1 has a grouting pipe 101. The grouting machine 1 can be a piston-type grouting machine, a screw-type grouting machine, or a pneumatic grouting machine, and its output end is connected to the grouting pipe 101. The grouting pipe 101 is used to transport grouting materials, which can be epoxy resin, polyurethane, or cement grout. A quick-connect coupling can be installed at the connection between the grouting pipe 101 and the grouting needle 3, allowing for quick installation and disassembly without tools; a threaded coupling can also be installed at the connection between the grouting pipe 101 and the grouting needle 3, providing reliable connection and good sealing. A pressure gauge and a flow regulating valve can be installed on the grouting machine 1 to control the grouting pressure and flow rate. The grouting pipe 101 can be a transparent reinforced hose for easy observation of grout flow. In addition to transparent reinforced hoses, the grouting pipe 101 can also be a steel wire braided high-pressure hose, which has high pressure resistance, is not prone to bursting, and is suitable for high-pressure grouting applications.

[0044] The positioning block 2 has a first groove 201 and a through hole 202. The first groove 201 extends horizontally, and the through hole 202 extends vertically and communicates with the first groove 201. The positioning block 2 is used to cover the opening of the grouting hole to reduce grout leakage. The positioning block 2 is a block-shaped component and can be made of metal materials such as aluminum alloy or stainless steel. Metal positioning blocks 2 are high-strength, wear-resistant, and durable. The positioning block 2 can also be made of engineering plastics such as nylon or polyoxymethylene. Plastic positioning blocks 2 are lightweight and do not damage the concrete surface. A flexible gasket, such as a rubber gasket or silicone gasket, can be placed on the bottom surface of the positioning block 2 facing the concrete crack surface to enhance the adhesion and sealing with the concrete surface. The through hole 202 penetrates the upper and lower surfaces of the positioning block 2. The diameter of the through hole 202 is slightly larger than the outer diameter of the grouting needle 3, allowing the grouting needle 3 to pass through. The first groove 201 is opened inside or on the side of the positioning block 2, extends horizontally, and intersects with the through hole 202. The positioning block 2 covers the opening of the grouting hole pre-drilled in the crack area, covering the hole opening by its own weight; it can also be tightened externally, such as by magnetic attraction, adhesive, or hand pressure, to prevent grout from leaking out of the hole opening during grouting. The positioning block 2 can also be provided with multiple through holes 202 for inserting multiple grouting needles 3 at the same time.

[0045] The grouting needle 3 is slidably connected to the through hole 202, and the top of the grouting needle 3 is connected to the grouting pipe 101. The grouting needle 3 is a slender hollow needle tube, which can be made of stainless steel or brass. The outer diameter of the grouting needle 3 slides in fit with the inner diameter of the through hole 202, and the grouting needle 3 is used to deliver grout. The top of the grouting needle 3 can be equipped with a joint for fixing the grouting pipe 101. The joint can be a threaded joint, which provides reliable connection and good sealing; the joint can also be a quick-release joint to improve construction efficiency. The grouting needle 3 can slide vertically up and down in the through hole 202 to adjust the insertion depth into the grouting hole. The outer wall of the grouting needle 3 can also be equipped with scale marks so that construction personnel can observe the insertion depth of the grouting needle 3. The grouting needle 3 can be made replaceable, and different lengths or diameters of needles can be selected according to the crack width; a sealing ring can be installed between the grouting needle 3 and the through hole 202 to prevent grout from overflowing from the top of the through hole 202.

[0046] The clamping block 4 is slidably connected to the first slide groove 201, and can lock or unlock the grouting needle 3. The shape of the clamping block 4 matches the first slide groove 201, such as rectangular, T-shaped or dovetail-shaped, and can slide back and forth horizontally within the first slide groove 201. The side of the clamping block 4 facing the grouting needle 3 has a clamping surface, which can be set as a plane, making the plane clamping structure easy to process; the clamping surface can also be set as a V-shaped surface, which can automatically center the grouting needle 3; the clamping surface can also be set as an arc surface that matches the outer diameter of the grouting needle 3 to improve the fit. When the clamping block 4 moves toward the through hole 202, i.e., closer to the grouting needle 3, the clamping surface presses the grouting needle 3, restricting the axial movement of the grouting needle 3 by friction or mechanical clamping; when the clamping block 4 moves away from the grouting needle 3, the locking of the grouting needle 3 is released, and the grouting needle 3 can slide up and down along the through hole 202. The surface of the clamping block 4 that contacts the grouting needle 3 can also be fitted with a rubber pad to increase friction and protect the needle body, or it can be fitted with a knurled pattern to increase friction.

[0047] Fastener 5 is movably inserted through the side wall of positioning block 2. One end of fastener 5 extends horizontally into the first slide groove 201 and is used to clamp clamping block 4, thereby limiting the horizontal position of clamping block 4 in the first slide groove 201. Fastener 5 can be a set screw, bolt, or locking screw with a handle. Fastener 5 engages with the threaded hole in the side wall of positioning block 2, with its inner end extending into the first slide groove 201 and abutting against the side of clamping block 4 away from grouting needle 3. When fastening fastener 5, fastener 5 pushes clamping block 4 towards grouting needle 3 and clamps it, maintaining the locked state using the self-locking characteristic of the thread without the need for continuous external force; when fastening fastener 5 is loosened, fastener 5 releases the pushing force on clamping block 4, facilitating unlocking. The head of fastener 5 can be in the form of an internal hexagon, slotted, Phillips head, or butterfly handle, etc., for easy turning with other tools or by hand. As an alternative setting, fastener 5 can be set as an eccentric cam locking handle. Rotating the eccentric handle can quickly tighten or loosen the clamping block 4, which is quick to operate and self-locking and reliable.

[0048] The elastic element 6 is located within the first groove 201. One end of the elastic element 6 is connected to the positioning block 2, and the other end is connected to the clamping block 4, so that the clamping block 4 tends to move away from the grouting needle 3. The elastic element 6 can be a tension spring, with one end connected to the end of the first groove 201 away from the through hole 202, and the other end connected to the end of the clamping block 4 away from the grouting needle 3. Under the tension of the tension spring, the clamping block 4 tends to move away from the grouting needle 3. Alternatively, the elastic element 6 can be a compression spring, with one end connected to the end of the clamping block 4 near the grouting needle 3, and the other end connected to the end of the first groove 201 away from the through hole 202. Under the thrust of the compression spring, the clamping block 4 tends to move away from the grouting needle 3. When fastener 5 is loosened, elastic element 6 automatically pushes clamping block 4 away, moving clamping block 4 away from grouting needle 3, and grouting needle 3 returns to its free sliding state; when fastener 5 is tightened, the thrust of fastener 5 overcomes the elastic force of elastic element 6, pushing clamping block 4 towards grouting needle 3, ensuring reliable locking. Multiple elastic elements 6 can also be provided, evenly distributed to provide uniform restoring force.

[0049] In use, firstly, grouting holes are drilled at appropriate locations in the bridge cracks. Positioning block 2 is placed over the grouting holes, with the through hole 202 aligned with the grouting hole. Then, the grouting needle 3 is connected to the grouting pipe 101 of the grouting machine 1, and inserted into the grouting hole along the through hole 202. At this time, clamping block 4 is positioned away from the grouting needle 3 under the elastic force of elastic element 6, allowing the grouting needle 3 to slide freely within the through hole 202. When the grouting needle 3 has reached the preset depth, the fastener 5 is rotated. The fastener 5 pushes inward, propelling clamping block 4 along the first sliding groove 201 towards the grouting needle 3. Clamping block 4 overcomes the elastic force of elastic element 6, pressing against the outer wall of the grouting needle 3, locking the grouting needle 3 securely to positioning block 2, preventing the grouting needle 3 from exiting the grouting hole due to pressure during grouting. Fastener 5 maintains the locked state using its threaded self-locking characteristic. Start the grouting machine 1. The grouting material enters the grouting needle 3 through the grouting pipe 101, and then is injected into the grouting hole through the grouting needle 3 to fill the crack. During the grouting process, the positioning block 2 covers the opening of the grouting hole to prevent grout from leaking out of the hole. At the same time, because the grouting needle 3 is reliably locked by the clamping block 4, it will not move outward due to grouting pressure, ensuring the continuity and sealing of the grouting. After the grouting is completed, loosen the fastener 5, and the elastic element 6 automatically pushes the clamping block 4 to reset, releasing the lock on the grouting needle 3. The operator can then pull the grouting needle 3 out of the grouting hole, remove the positioning block 2, and then seal the grouting hole.

[0050] The grouting machine 1 has a grouting pipe 101, and the positioning block 2 has a first groove 201 and a through hole 202. The first groove 201 extends horizontally, and the through hole 202 extends vertically and is connected to the first groove 201. The positioning block 2 is used to cover the opening of the grouting hole to reduce grout leakage. The grouting needle 3 is slidably connected to the through hole 202, and the top of the grouting needle 3 is connected to the grouting pipe 101. Since the grouting needle 3 can slide freely in the vertical direction within the through hole 202, the operator can arbitrarily adjust the insertion depth of the grouting needle 3 according to the actual depth of the bridge crack. This allows the same device to be applied to different grouting needs for shallow, medium, and deep cracks, solving the problem that existing devices cannot adapt to cracks of varying depths due to fixed needle depth or limited adjustment range. Meanwhile, the positioning block 2 covers the grouting hole opening, effectively reducing the leakage of grout from the hole opening during the grouting process, ensuring the sealing of the hole opening when grouting at different depths, avoiding grout overflow caused by grouting pressure fluctuations due to depth changes, and ensuring that the grout can be smoothly injected into the depth of the crack along the needle.

[0051] Based on the slidable connection of the clamping block 4 to the first slide groove 201, the clamping block 4 can lock or unlock the grouting needle 3. The fastener 5 is movably inserted through the side wall of the positioning block 2, with one end extending horizontally into the first slide groove 201 and used to press the clamping block 4, thus limiting the horizontal position of the clamping block 4 within the slide groove. When the grouting needle 3 is adjusted to the desired depth, rotating the fastener 5 pushes the clamping block 4 towards the grouting needle 3 and presses it, reliably locking the grouting needle 3 at that depth. Because the fastener 5 has a self-locking characteristic with the threaded engagement with the side wall of the positioning block 2, even under the counter-force of the grouting pressure during the grouting process, the grouting needle 3 will not slip upwards or shift in depth. This ensures that regardless of changes in crack depth, the grouting needle 3 can be stably locked at the preset depth, avoiding the problem of poor grout injection effect due to needle withdrawal or loosening.

[0052] The elastic element 6 is located within the first groove 201. One end of the elastic element 6 is connected to the positioning block 2, and the other end is connected to the clamping block 4, so that the clamping block 4 tends to move away from the grouting needle 3. When the needle depth needs to be adjusted or the hole needs to be moved to a different depth after grouting a hole, simply loosen the fastener 5. The elastic force of the elastic element 6 will automatically push the clamping block 4 away from the grouting needle 3, immediately releasing the lock. This design avoids the clamping block 4 remaining in the locked position due to friction or jamming after the fastener 5 is loosened, which would prevent the grouting needle 3 from sliding or being pulled out smoothly. The active reset function of the elastic element 6 makes depth switching operations convenient and significantly improves work efficiency.

[0053] Preferably, a minimally invasive grouting reinforcement and repair device for bridge cracks further includes a fixing block 7. The bottom of the fixing block 7 is provided with a second sliding groove 701, which extends along the length of the fixing block 7. The fixing block 7 is a long strip-shaped base, which can be made of aluminum alloy, stainless steel, or engineering plastic, and its length can be designed according to the distribution range of the bridge cracks. The second sliding groove 701 can be a T-shaped groove, a dovetail groove, or a rectangular groove, extending along the length of the fixing block 7. The second sliding groove 701 is used to install multiple positioning blocks 2 and allows them to slide along the length of the fixing block 7. Locking screws can be provided between the positioning blocks 2 and the second sliding groove 701 to fix the positioning blocks 2 after adjusting their horizontal position.

[0054] The fixing block 7 is also provided with a third sliding groove 702, which is located at the top of the fixing block 7 and extends along the length of the fixing block 7. The third sliding groove 702 connects to the second sliding groove 701. The grouting needle 3 passes through the third sliding groove 702 and can move along the length of the third sliding groove 702. The grouting needle 3 passes through the third sliding groove 702 and can move freely along the length of the third sliding groove 702, thereby achieving horizontal position adjustment of the grouting needle 3 without moving the entire fixing block 7.

[0055] Multiple positioning blocks 2 are provided, each slidably connected to a second sliding groove 701. These positioning blocks 2 are spaced apart along the length of the fixed block 7. Each positioning block 2 is equipped with at least one grouting needle 3, a clamping block 4, a fastener 5, and an elastic element 6. The positioning blocks 2 are slidably connected within the second sliding groove 701, and each positioning block 2 is equipped with an independent clamping block 4, fastener 5, elastic element 6, and a cooperating grouting needle 3. The spacing between adjacent positioning blocks 2 can be adjusted according to the crack spacing. This design allows the device to simultaneously grout multiple cracks or grouting holes without needing to move and reposition the fixed blocks 7 individually, improving the efficiency of crack repair. Furthermore, the insertion depth of each positioning block 2's grouting needle 3 can be independently adjusted without interference, enhancing the practicality of the device.

[0056] Preferably, a minimally invasive grouting reinforcement and repair device for bridge cracks also includes a handcart 8, on which the grouting machine 1 is mounted. The handcart 8 has a frame, which can be a welded steel pipe frame, an aluminum alloy profile frame, or a plastic injection molded frame. Multiple casters can be installed at the bottom for easy movement on the bridge. The casters can be equipped with locking devices; after the entire device has been moved to the designated position, the casters can be locked to prevent movement during operation. The grouting machine 1 can be fixedly installed on the frame by bolts, snap-fit ​​connections, or other methods to prevent it from falling off during transportation or operation. The handcart 8 can also be equipped with push-pull handles, which can be covered with rubber anti-slip sleeves for easy pushing by the operator. The handcart 8 can also integrate auxiliary equipment such as lighting and warning lights to improve the practicality of the device.

[0057] Preferably, the handcart 8 is equipped with a first lifting mechanism 801, which drives the fixed block 7. The first lifting mechanism 801 is used to control the fixed block 7 to move closer to or further away from the grouting hole. The first lifting mechanism 801 is installed between the handcart 8 and the fixed block 7, and is used to adjust the overall height of the fixed block 7 and its multiple positioning blocks 2 and grouting needles 3, so that the positioning blocks 2 can cover the grouting hole and provide downward pressure to the positioning blocks 2 to reduce grout leakage. The first lifting mechanism 801 can also be an electric push rod, with the cylinder body of the electric push rod fixed to the handcart 8 and the end of the push rod connected to the fixed block 7. Electric lifting is achieved by a control switch. The first lifting mechanism 801 can also be set as a gear and rack lifting mechanism, which is driven by a hand crank or a motor. The first lifting mechanism 801 can also be equipped with a locking device, such as a locking nut or a pin, to lock the fixed block 7 at the set height after adjustment.

[0058] Preferably, the first lifting mechanism 801 includes a handwheel 8011, a lead screw 8012, and a slider 8013. A fourth groove 802 is provided on one side of the handcart 8, extending vertically. The slider 8013 is slidably connected to the fourth groove 802 and connected to the fixing block 7. The lead screw 8012 is pivotally connected to the handcart 8 and screwed onto the slider 8013, extending vertically. The handwheel 8011 is connected to one end of the lead screw 8012 and is used to drive the lead screw 8012 to rotate. The fourth groove 802 is formed on one side of the handcart 8, with a T-shaped or dovetail-shaped cross-section, extending vertically. The slider 8013 is embedded in the fourth groove 802 and can slide up and down along it. A bearing seat may be provided on one side of the handcart 8, with the lead screw 8012 extending vertically and pivotally connected to the bearing seat. The slider 8013 has a threaded through hole extending vertically, and the lead screw 8012 engages with the threaded through hole. The handwheel 8011 is fixed to the top or bottom of the lead screw 8012, and can be equipped with a non-slip rubber sleeve or a folding handle. When the handwheel 8011 is turned, the lead screw 8012 rotates, driving the slider 8013 to move up and down along the fourth slide groove 802, thereby raising and lowering the fixed block 7 and the positioning block 2, grouting needle 3, etc., mounted on it. As an alternative, the handwheel 8011 can be replaced with a hand crank or an electric motor. A scale pointer can be installed on the slider 8, which, in conjunction with the height scale on the trolley 8, facilitates precise adjustment of the lifting height.

[0059] Preferably, the fixing block 7 is further provided with a fifth sliding groove 703. The fifth sliding groove 703 is located on the side wall of the fixing block 7 and extends along the length direction of the fixing block 7. The fifth sliding groove 703 is connected to the second sliding groove 701. The fastener 5 passes through the fifth sliding groove 703 and can move along the length direction of the fifth sliding groove 703. The fifth sliding groove 703 is a long strip-shaped through groove that extends along the length direction of the fixing block 7 and is connected to the second sliding groove 701. The fastener 5 configured on each positioning block 2 extends out from the side wall of the positioning block 2 and extends through the fifth sliding groove 703 to the outside of the fixing block 7. The head of the fastener 5 is located on the outside of the fixing block 7, which is convenient for the operator to tighten by hand or with tools. When the positioning block 2 moves along the second sliding groove 701, the fastener 5 slides synchronously in the fifth sliding groove 703. The length of the fifth sliding groove 703 determines the adjustable horizontal range of the positioning block 2.

[0060] Preferably, the handcart 8 is equipped with a second lifting mechanism 803. A minimally invasive grouting reinforcement and repair device for bridge cracks also includes a drilling machine 9. The second lifting mechanism 803 drives and connects to the drilling machine 9, and is used to control the drilling machine 9 to move closer to or further away from the ground. The drilling machine 9 is used to drill grouting holes at the bridge cracks and can be a handheld electric hammer, magnetic drill, or pneumatic impact drill. The second lifting mechanism 803 is integrated into the handcart 8, and its structure is similar to or different from the first lifting mechanism 801. It is used to drive the drilling machine 9 to move up and down. The second lifting mechanism 803 can adopt a lead screw 8012 lifting mechanism, an electric push rod, or a gear and rack lifting drive method. For example, the second lifting mechanism 803 may include a bracket, a guide rod, a connecting block, and a rotating shaft. The bracket and the guide rod are both fixedly connected to the handcart 8. The guide rod extends upward in the vertical direction. The connecting block has a hole extending in the vertical direction. The hole in the connecting block is slidably connected to the guide rod. The connecting block is fixedly connected to the drilling machine 9. The connecting block is provided with a rack. The rack extends in the vertical direction. The rotating shaft is pivotally connected to the bracket and extends in the horizontal direction. The rotating shaft is fixedly connected with a gear. The gear meshes with the rack. The rotating shaft may be provided with a drive structure. This drive structure is used to rotate the rotating shaft and control the drilling machine to move axially along the guide rod.

[0061] Preferably, the grouting pipe 101 includes a first pipe 1011, a multi-port pipe 1012, and multiple second pipes 1013. The first pipe 1011 is connected to the multiple second pipes 1013 through the multi-port pipe 1012, and the multiple second pipes 1013 are respectively connected to corresponding grouting needles 3. The first pipe 1011 is the main output pipe of the grouting machine 1, with one end connected to the output port of the grouting machine 1 and the other end connected to the inlet of the multi-port pipe 1012. The multi-port pipe 1012 can be a two-way, three-way, four-way, or more-way diverter, and its material can be stainless steel, brass, or engineering plastic. Each outlet of the multi-port pipe 1012 is connected to a second pipe 1013, and the end of each second pipe 1013 is connected to a grouting needle 3. This structure allows one grouting machine 1 to simultaneously deliver grout to multiple grouting needles 3, realizing multi-point synchronous grouting, which is suitable for simultaneous operation of multiple cracks or multiple grouting holes on the same crack, significantly improving the construction efficiency of large-area crack repair. Each of the multiple outlets of the multi-port pipe 1012 can be equipped with a shut-off valve. When only single-hole grouting is required, the extra second pipe 1013 can be closed through the shut-off valve. As an alternative configuration, the multi-port pipe 1012 can be connected to the first pipe 1011 and the second pipe 1013 using quick-connect couplings for easy disassembly and cleaning. Each second pipe 1013 can be independently equipped with a flow regulating valve or ball valve to control the grout flow of each grouting needle 3, achieving branch regulation and improving the practicality of the device.

[0062] Preferably, the handcart 8 is equipped with a vacuum cleaner 10, which is used to remove gravel and dust from the grouting hole. The vacuum cleaner 10 is fixedly installed on the platform or bracket of the handcart 8. The vacuum cleaner 10 can be an industrial-grade wet / dry vacuum cleaner 10, a portable canister vacuum cleaner 10, or a rechargeable handheld vacuum cleaner 10. The end of the suction pipe of the vacuum cleaner 10 can be equipped with a thin nozzle or a brush head, which can be easily inserted into the grouting hole to remove gravel particles, cement dust, and other debris generated during drilling, ensuring the cleanliness of the grouting hole and thus improving the bonding strength between the grouting material and the hole wall.

[0063] Secondly, the present invention provides a method for minimally invasive grouting reinforcement and repair of bridge cracks using a bridge crack minimally invasive grouting reinforcement and repair device, comprising:

[0064] The first step is to use tools to drill grouting holes. Grouting holes are drilled at predetermined locations along the bridge cracks. The diameter of the grouting hole is slightly larger than the outer diameter of the grouting needle 3, and the depth is determined based on the actual direction and width of the crack. After drilling, a vacuum cleaner 10 or a high-pressure air gun can be used to remove debris and dust from the holes to keep the ducts clean.

[0065] The second step is to place the positioning block 2 over the grouting hole and align the through hole 202 with the grouting hole. The operator holds the positioning block 2 and aligns the through hole 202 on its bottom surface with the drilled grouting hole. Then, the positioning block 2 is flatly placed on the concrete surface and further fixed to prevent the positioning block 2 from moving during the grouting process and to reduce grout overflow.

[0066] The third step is to connect the grouting needle 3 to the grouting pipe 101 of the grouting machine 1, and extend the grouting needle 3 into the grouting hole along the through hole 202; the top connector of the grouting needle 3 is connected to the grouting pipe 101, which can be a quick-release connector or a threaded connector. The operator holds the grouting needle 3, passes it through the through hole 202 of the positioning block 2, and slowly inserts it into the grouting hole.

[0067] Fourth, when the grouting needle 3 has reached the preset depth, adjust the fastener 5 to push the clamping block 4 to slide along the first slide groove 201 and approach the grouting needle 3, thus locking the grouting needle 3. Rotate the fastener 5, which will push it closer to the clamping block 4, pushing the clamping block 4 to overcome the elastic force of the elastic element 6 and move towards the grouting needle 3, so that the clamping block 4 presses against the outer wall of the grouting needle 3, firmly locking the grouting needle 3 at the current depth. Due to the self-locking characteristic of the fastener 5's thread, it can maintain the locked state without continuous force after locking.

[0068] Fifth, start the grouting machine 1 to grout the bridge cracks. Turn on the grouting machine 1, adjust the grouting pressure and flow rate, and the grout enters the grouting needle 3 through the grouting pipe 101, then is injected into the grouting hole through the grouting needle 3 to fill the crack. During the grouting process, the positioning block 2 covers the hole opening to reduce leakage, and the clamping block 4 ensures that the grouting needle 3 does not retract. After grouting is completed, turn off the grouting machine 1, loosen the fastener 5, and the elastic element 6 automatically pushes the clamping block 4 to reset and unlock, allowing the grouting needle 3 to be pulled out. Finally, seal the grouting hole.

[0069] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0071] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A minimally invasive grouting reinforcement and repair device for bridge cracks, characterized in that, include: Grouting machine (1), the grouting machine (1) having grouting pipe (101); The positioning block (2) is provided with a first groove (201) and a through hole (202). The first groove (201) extends in the horizontal direction, and the through hole (202) extends in the vertical direction and is connected to the first groove (201). The positioning block (2) is used to cover the opening of the grouting hole to reduce grout leakage. Grouting needle (3), the grouting needle (3) is slidably connected to the through hole (202), and the top of the grouting needle (3) is connected to the grouting pipe (101). Clamping block (4), which is slidably connected to the first slide groove (201), and which can lock or unlock the grouting needle (3); Fastener (5), the fastener (5) is movably inserted through the side wall of the positioning block (2), one end of the fastener (5) extends horizontally into the first slide groove (201) and is used to press the clamping block (4) to limit the horizontal position of the clamping block (4) in the first slide groove (201); The elastic element (6) is located in the first groove (201). One end of the elastic element (6) is connected to the positioning block (2), and the other end of the elastic element (6) is connected to the clamping block (4) so ​​that the clamping block (4) has a tendency to move away from the grouting needle (3).

2. The bridge crack minimally invasive grouting reinforcement and repair device according to claim 1, characterized in that, The bridge crack minimally invasive grouting reinforcement and repair device also includes a fixing block (7), the bottom of which is provided with a second sliding groove (701), the second sliding groove (701) extending along the length direction of the fixing block (7); The fixing block (7) is also provided with a third sliding groove (702), which is located at the top of the fixing block (7) and extends along the length of the fixing block (7). The third sliding groove (702) is connected to the second sliding groove (701). The grouting needle (3) passes through the third sliding groove (702) and can move along the length of the third sliding groove (702). The positioning block (2) is provided in multiple ways. All of the positioning blocks (2) are slidably connected to the second slide groove (701). The positioning blocks (2) are distributed at intervals along the length direction of the fixing block (7). Each of the positioning blocks (2) is equipped with at least one grouting needle (3), the clamping block (4), the fastener (5) and the elastic element (6).

3. The bridge crack minimally invasive grouting reinforcement and repair device according to claim 2, characterized in that, The bridge crack minimally invasive grouting reinforcement and repair device also includes a handcart (8), and the grouting machine (1) is installed on the handcart (8).

4. The bridge crack minimally invasive grouting reinforcement and repair device according to claim 3, characterized in that, The handcart (8) is provided with a first lifting mechanism (801), which drives the fixed block (7) and controls the fixed block (7) to move closer to or further away from the grouting hole.

5. The bridge crack minimally invasive grouting reinforcement and repair device according to claim 4, characterized in that, The first lifting mechanism (801) includes a handwheel (8011), a lead screw (8012), and a slider (8013). A fourth slide groove (802) is provided on one side of the handcart (8). The fourth slide groove (802) extends vertically. The slider (8013) is slidably connected to the fourth slide groove (802). The slider (8013) is connected to the fixed block (7). The lead screw (8012) is pivotally connected to the handcart (8) and screwed to the slider (8013). The lead screw (8012) extends vertically. The handwheel (8011) is connected to one end of the lead screw (8012). The handwheel (8011) is used to drive the lead screw (8012) to rotate.

6. The bridge crack minimally invasive grouting reinforcement and repair device according to claim 5, characterized in that, The fixing block (7) is also provided with a fifth slide groove (703). The fifth slide groove (703) is provided on the side wall of the fixing block (7) and extends along the length direction of the fixing block (7). The fifth slide groove (703) is connected to the second slide groove (701). The fastener (5) passes through the fifth slide groove (703) and can move along the length direction of the fifth slide groove (703).

7. The bridge crack minimally invasive grouting reinforcement and repair device according to claim 3, characterized in that, The handcart (8) is equipped with a second lifting mechanism (803), and the bridge crack minimally invasive grouting reinforcement and repair device also includes a drilling machine (9). The second lifting mechanism (803) drives and connects to the drilling machine (9). The second lifting mechanism (803) is used to control the drilling machine (9) to move closer to or away from the ground.

8. The bridge crack minimally invasive grouting reinforcement and repair device according to claim 2, characterized in that, The grouting pipe (101) includes a first pipe (1011), a multi-port pipe (1012) and a plurality of second pipes (1013). The first pipe (1011) is connected to the plurality of second pipes (1013) through the multi-port pipe (1012), and the plurality of second pipes (1013) are respectively connected to the corresponding grouting needles (3).

9. A minimally invasive grouting reinforcement and repair device for bridge cracks according to claim 3, characterized in that, The handcart (8) is equipped with a vacuum cleaner (10), which is used to suck out gravel and dust from the grouting hole.

10. A method for minimally invasive grouting reinforcement and repair of bridge cracks using the bridge crack minimally invasive grouting reinforcement and repair device described in claim 1, characterized in that, Includes the following steps: The first step is to use tools to machine the grouting holes; The second step is to place the positioning block (2) over the grouting hole, and align the through hole (202) with the grouting hole; The third step is to connect the grouting needle (3) to the grouting pipe (101) of the grouting machine (1) and extend the grouting needle (3) into the grouting hole along the through hole (202); Fourth step: When the grouting needle (3) is inserted to the preset depth, adjust the fastener (5) to push the clamping block (4) to slide along the first slide groove (201) and get close to the grouting needle (3), and lock the grouting needle (3). Fifth step, start the grouting machine (1) to grout the cracks in the bridge.

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