A temporary support grouting bag and temporary support method for operating ballastless track of high-speed railway

Abstract

This invention discloses a temporary support grouting bag and a temporary support method for operating ballastless tracks of high-speed railways. In the temporary support grouting bag, the bag body and connecting sleeves of the segmented grouting bag are continuously distributed and connected at intervals to form a segmented structure. The bag body and connecting sleeves are interconnected, allowing grout to fill each bag body. The width of the connecting sleeve is determined comprehensively based on the width of the bag body and the sleeper spacing of the ballastless track, ensuring that each sleeper is supported by a grout-filled bag body. The central vertical bag of the multi-legged grouting bag is vertically positioned, with at least three bag legs horizontally distributed and connected around the central vertical bag to form a multi-legged structure. The central vertical bag and the bag legs are interconnected, allowing grout to fill each bag leg. Through the technical solution of this invention, a scientific and reasonable stress support for the track structure is achieved, while optimizing the size and quantity of the grouting bags, improving the ease of use and dismantling of the grouting bags.

Description

Technical Field

[0001] This invention relates to the field of track maintenance technology, and in particular to a temporary support grouting bag for operating high-speed railway ballastless track and a temporary support method for operating high-speed railway ballastless track. Background Technology

[0002] By the end of 2021, the total operating mileage of China's high-speed railway network had exceeded 40,000 kilometers. Maintaining the safe, reliable, fast, comfortable, and long-lasting operation of high-speed railways is the primary task of railway operation management.

[0003] Practice shows that as operating time increases, ballastless track needs repair or replacement due to settlement, offset, or damage to track components. Since maintenance and repair of operating high-speed railways can only be carried out during track maintenance windows, which are generally only 4 hours, it is impossible to complete the maintenance and repair work of the entire section within one window. In order not to affect the line opening requirements after the end of the track maintenance window, temporary support is required for ballastless track components such as track slabs and track slabs to meet the safety and stability requirements for train passage. In subsequent track maintenance windows, this temporary support scheme also needs to be easy to dismantle in order to finally restore the track condition.

[0004] The following two technical solutions exist in the existing technology:

[0005] (1) Invention patent (CN104153260B) discloses a grouting bag for grouting and lifting of ballastless track and its manufacturing and usage method. It is made of a material with high strength, thin thickness, good air permeability and low dry heat shrinkage. One end of the grouting bag is closed and the other end is open. The open end is used to insert the grouting pipe. The mouth of the grouting bag is tied tightly around the grouting pipe, and the rest of the bag is tightly folded and wrapped around the outside of the grouting pipe. The corresponding shape and size of the cloth bag are numbered according to the different lifting amounts. Before grouting, the corresponding numbered grouting bag with the grouting pipe inserted is inserted into the corresponding numbered grouting hole under the ballastless track. During grouting, the grouting bag is fully expanded to the designed shape and size under the grouting pressure, thereby realizing the precise and controllable lifting of the upper ballastless track. Then the grouting material in the grouting bag hardens rapidly, supporting and positioning the ballastless track in the predetermined position.

[0006] (2) Invention Patent (CN112030630A) "Grouting Bag for Ballastless Track Adjustment Layer and its Usage Method" discloses a grouting bag for ballastless track adjustment layer and its usage method. The grouting bag has a grouting bag opening on at least one side, and a binding piece is provided on the grouting bag opening. The grouting bag is used to be placed in the area between the concrete base and the track slab to adjust and support the track slab. The grouting bag is filled with grouting material. The longitudinal and transverse dimensions of the grouting bag are not less than the longitudinal and transverse dimensions of the track slab. The inner and outer contours of the grouting bag after filling are consistent with the inner and outer contours of the track slab. The longitudinal ends of the grouting bag are respectively limited by convex baffles set on the concrete base. The longitudinal ends of the grouting bag are provided with clearance grooves that cooperate with the convex baffles. This grouting bag has a simple structure, is easy to install and use, and can be used for the installation of ballastless track structures in newly built lines and the height adjustment of track slabs. It simplifies construction, eliminates the need for formwork, and facilitates subsequent maintenance and replacement.

[0007] In the above technical solution, although the grouting bag for grouting and lifting of ballastless track and its manufacturing and usage method use grouting bags for controllable lifting, a large number of grouting bags are required under the track slab in each unit. Moreover, grouting material still needs to be injected between the grouting bags and between the base and the crushed stone layer, making the entire construction process still cumbersome. Furthermore, the bonding parts need to be removed during subsequent repairs, which is not conducive to subsequent repairs.

[0008] Grouting bags for ballastless track adjustment layers and their application methods: On the one hand, the grouting bags used are too large, wasting materials and requiring a lot of work for subsequent dismantling; on the other hand, their shape is only suitable for unit plates and not for other track structures such as longitudinal connecting plates, double-block types, and turnouts. Therefore, they are not suitable for completing temporary support for various types of ballastless tracks during track maintenance windows. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a temporary support grouting bag and a temporary support method for operating ballastless tracks of high-speed railways. By using segmented grouting bags installed under the track slab sleepers and multi-limb grouting bags installed in the grouting holes of the track slab, the invention achieves scientific and reasonable stress support for the track structure, meets the conditions for safe train passage during temporary support, and optimizes the size and quantity of grouting bags, improving the ease of use and dismantling of the grouting bags.

[0010] To achieve the above objectives, the present invention provides a temporary support grouting bag for operating ballastless tracks of high-speed railways, comprising: articulated grouting bags and multi-limb grouting bags;

[0011] The articulated grouting bag includes a bag body and a connecting sleeve. The bag body and the connecting sleeve are continuously connected at intervals to form an articulated structure. The bag body and the connecting sleeve are interconnected, so that the grout can be filled into each bag body. The width of the connecting sleeve is determined by a combination of the width of the bag body and the sleeper spacing of the ballastless track, so that the sleepers below are all supported by the grout-filled bag body.

[0012] The multi-limb grouting bag includes a central vertical bag and bag limbs. The central vertical bag is vertically arranged, and at least three bag limbs are horizontally distributed and connected around the central vertical bag to form a multi-limb structure. The central vertical bag and the bag limbs are interconnected, so that the grout injected into the central vertical bag can fill each bag limb.

[0013] In the above technical solution, preferably, the segmental grouting bag is used to be placed into the cavity formed by chiseling away the filling layer of the ballastless track, and the injected fast-hardening and early-strength grout material is used to solidify and form a supporting effect on the sleeper.

[0014] The multi-limb grouting bag is used for the grouting hole of the ballastless track. The central vertical bag is placed in the grouting hole, and the bag limbs are placed in the cavity below the track slab. After the injected fast-hardening and early-strength grout material is cured, it forms a supporting effect on the grouting port and plays a longitudinal and lateral limiting role on the track slab.

[0015] In the above technical solution, preferably, the arthropod grouting bag and the multi-limb grouting bag are made of one or more woven or nonwoven fabrics selected from polyester, spandex, polypropylene, nylon, acrylic, polyester, nylon and plant fibers, with a bursting strength greater than 1.4kN, a tearing strength greater than 0.28kN, a breaking strength greater than 10kN / m, a thickness less than 5mm, an air permeability greater than 100mm / s, and a dry heat shrinkage rate less than 10%.

[0016] In the above technical solution, preferably, the center position of the bag body is aligned with the center position of the sleeper, the full-filled support area of ​​the bag body is 20% to 50% of the ballastless track area, and the full-filled thickness of the bag body is not less than the height that needs to be supported.

[0017] The central vertical bag has a cylindrical structure, the diameter of which is not less than the diameter of the grouting hole, the height of which is not less than the thickness of the track plate, and the diameter of the bag limb is not less than the height that needs to be supported.

[0018] In the above technical solution, preferably, the segmental grouting bag uses the holes formed by the cut-off portions of the connecting sleeves on both sides of the ballastless track as grouting ports, and the multi-limb grouting bag uses the top of the central vertical bag as the grouting port.

[0019] In the above technical solution, preferably, a cutting line is provided in the middle part of the connecting sleeve of the arthropod grouting bag, so that the continuously distributed arthropod grouting bags can be easily cut into suitable specifications.

[0020] In the above technical solution, preferably, the limb grouting bag is provided with sequentially numbered labels.

[0021] This invention also proposes a temporary support method for operating high-speed railway ballastless track, utilizing the temporary support grouting bag for operating high-speed railway ballastless track disclosed in any of the above technical solutions, comprising:

[0022] Based on the specifications of the ballastless track to be temporarily supported, determine the required width of the connecting sleeve and the number of bags for the articulated grouting bags, and cut the required articulated grouting bags to obtain the required diameter of the center vertical bag of the required multi-limb grouting bags.

[0023] After the filling layer of the ballastless track is removed, the segmented grouting bags are placed under the track slab that needs temporary support, so that the center position of each bag is aligned with the center position of the corresponding sleeper, and the central vertical bag of the multi-leg grouting bag is placed into the grouting hole of the ballastless track, so that the segments of the multi-leg grouting bag are distributed around the grouting hole under the track slab.

[0024] After the track slab is precisely adjusted, fast-hardening and early-strength grout material is injected one by one or simultaneously through the grouting ports of the segmental grouting bags and the multi-segment grouting bags until the grout level at the grouting port is higher than the track slab. Grouting is then stopped, and the grout solidifies to form temporary support for the ballastless track.

[0025] In the above technical solutions, preferably, the temporary support method for operating high-speed railway ballastless track also includes:

[0026] After the temporary support function is completed, the track plate is lifted, the articular grouting bag and the multi-limb grouting bag are removed, and the articular grouting bag is cut off from the connecting sleeve.

[0027] In the above technical solution, preferably, the slurry material is one or more of self-compacting concrete, self-leveling mortar, emulsified asphalt-cement composite mortar, polymer emulsion-cement composite mortar, resin mortar and polyurethane slurry, with a workability retention capacity of more than 10 minutes and a compressive strength of more than 1 MPa after 1 hour.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting segmented grouting bags under the track slab sleepers and multi-limb grouting bags in the grouting holes of the track slab respectively, the scientific and reasonable stress support of the track structure is achieved, which meets the conditions for safe train passage during temporary support. At the same time, the size and quantity of grouting bags are optimized, which improves the ease of use and dismantling of grouting bags. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of two types of arthropod grouting bags disclosed in one embodiment of the present invention;

[0030] Figure 2 These are schematic diagrams of the front and top views of a multi-limb grouting bag disclosed in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram showing the arrangement of arthropod grouting bags according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram showing the arrangement of segmented grouting bags under each sleeper according to an embodiment of the present invention;

[0033] Figure 5 for Figure 4 A schematic cross-sectional view of the grout material injected into the segmental grouting bag corresponding to the embodiment shown;

[0034] Figure 6 This is a schematic diagram showing the arrangement of arthropod grouting bags and multi-limb grouting bags according to an embodiment of the present invention;

[0035] Figure 7 for Figure 6 A schematic cross-sectional view of the grout material injected into the segmental grouting bag corresponding to the embodiment shown;

[0036] Figure 8 This is a cross-sectional schematic diagram of the grout material injected into the multi-limb grouting bag according to an embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of the solidified body of the arthropod grouting bag, as disclosed in one embodiment of the present invention, with sections stacked together.

[0038] In the diagram, the correspondence between the components and the reference numerals is as follows:

[0039] 1. Segmented grouting bag, 1-1. Bag body, 1-2. Connecting sleeve, 1-3. Cutting line, 1-4. Numbering, 2. Multi-limb grouting bag, 2-1. Central vertical bag, 2-2. Bag limb, 3. Track slab, 3-1. Sleeper, 3-2. Grouting hole, 4. Filling layer, 5. Base plate / support layer. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The present invention will now be described in further detail with reference to the accompanying drawings:

[0042] like Figure 1 and Figure 2 As shown, a temporary support grouting bag for operating ballastless track of high-speed railway according to the present invention includes: articulated grouting bag 1 and multi-limb grouting bag 2;

[0043] The articulated grouting bag 1 includes a bag body 1-1 and a connecting sleeve 1-2. The bag body 1-1 and the connecting sleeve 1-2 are continuously connected at intervals to form an articulated structure. The bag body 1-1 and the connecting sleeve 1-2 are interconnected, so that the grout can be filled into each bag body 1-1. The width of the connecting sleeve 1-2 is determined by a combination of the width of the bag body 1-1 and the spacing of the sleepers 3-1 of the ballastless track, so that each sleeper 3-1 is supported by the grout-filled bag body 1-1.

[0044] The multi-limb grouting bag 2 includes a central vertical bag 2-1 and bag limbs 2-2. The central vertical bag 2-1 is set vertically, and at least three bag limbs 2-2 are horizontally distributed and connected around the central vertical bag 2-1 to form a multi-limb structure. The central vertical bag 2-1 and the bag limbs 2-2 are interconnected, so that the grout injected into the central vertical bag 2-1 can fill each bag limb 2-2.

[0045] In this embodiment, the segmented grouting bag 1, which is respectively set below the sleeper 3-1 of the track slab 3, and the multi-limb grouting bag 2, which is set in the grouting hole 3-2 of the track slab 3, achieve scientific and reasonable stress support for the track structure, meet the conditions for safe train passage during temporary support, and optimize the size and quantity of grouting bags, thereby improving the ease of use and dismantling of grouting bags.

[0046] like Figure 3 and Figure 4 As shown, in the above embodiment, preferably, the segmental grouting bag 1 is used to be placed into the cavity formed by the filling layer 4 after the ballastless track is removed, and the injected fast-hardening and early-strength grout material is cured to form a supporting effect on the sleeper 3-1.

[0047] The multi-limb grouting bag 2 is used for the grouting hole 3-2 of the ballastless track. The central vertical bag 2-1 is placed in the grouting hole 3-2 through the grouting hole 3-2, and the bag limbs 2-2 are placed in the cavity below the track slab 3. The injected fast-hardening and early-strength grout material solidifies and forms a support for the grouting hole 3-2, and also plays a role in longitudinal and lateral positioning of the track slab.

[0048] like Figures 5 to 7 As shown, after the track slab 3 is finely adjusted and the grout bag 1-1 is placed in the appropriate position, a fast-hardening and early-strength grout material is injected. The grout material quickly solidifies, positioning the temporary support of the ballastless track in the preset position. After the support is completed, the ballastless track is slightly lifted, and the segmented grout bag 1, along with the hardened grout material, can be pulled out. It is then cut at the middle of each connecting sleeve 1-2, and neatly stacked for transport away from the site. The segmented grout bag 1 has a simple structure and suitable size, making it easy to install and use for grouting on site. It also ensures that the track structure is scientifically and rationally stressed, meeting the conditions for safe train passage. It is easy to dismantle and transport, and is suitable for temporary support of various types of ballastless tracks in operating high-speed railways.

[0049] In the above embodiments, preferably, the arthropod grouting bag 1 and the multi-limb grouting bag 2 are made of one or more woven or nonwoven fabrics selected from polyester, spandex, polypropylene, nylon, acrylic, polyester, nylon and plant fibers, with a bursting strength greater than 1.4kN, a tearing strength greater than 0.28kN, a breaking strength greater than 10kN / m, a thickness less than 5mm, an air permeability greater than 100mm / s, and a dry heat shrinkage rate less than 10%.

[0050] Further extensive and systematic tests on the impact of support area on track structure safety have proven that when the interval does not exceed four sleepers, the vertical vibration acceleration, horizontal acceleration, derailment coefficient, wheel load reduction rate, and other indicators of the track structure can all meet the requirements for the safe passage of high-speed trains. Therefore, it was determined that when the location of the temporary support grouting bag is below the sleeper and the support area accounts for at least 20% and no more than 50% of the track slab area, safe and reliable temporary support can be achieved, while saving the amount of grouting material and reducing on-site work.

[0051] Therefore, in the above embodiments, preferably, the center position of the bag body 1-1 is aligned with the center position of the sleeper 3-1, the full-filled support area of ​​the bag body 1-1 is 20% to 50% of the ballastless track area, and the full-filled thickness of the bag body 1-1 is not less than the height that needs to be supported; preferably, the length of a single bag body 1-1 does not exceed 900mm, the width does not exceed 400mm, and the support area of ​​the entire bag body 1-1 does not need to support the entire ballastless track, but only needs to support up to 50%.

[0052] The central vertical bag 2-1 has a cylindrical structure. The diameter of the central vertical bag 2-1 is not less than the diameter of the grouting hole 3-2, and the height is not less than the thickness of the track plate 3. The diameter of the bag leg 2-2 is not less than the height that needs to be supported, and the length is not less than 300mm.

[0053] In the above embodiments, preferably, the articulated grouting bag 1 uses the holes formed by the cut portions of the connecting sleeves 1-2 on both sides of the ballastless track as grouting ports, and the multi-limb grouting bag 2 uses the top of the central vertical bag 2-1 as the grouting port. During implementation, the grouting funnel is inserted into the grouting port formed after cutting and tied tightly for later use. Grouting is performed through the grouting funnel when grouting is required.

[0054] In the above embodiment, preferably, a cutting line 1-3 is provided in the middle of the connecting sleeve 1-2 of the articulated grouting bag 1, so that the continuously distributed articulated grouting bags 1 can be easily cut into suitable specifications. Specifically, according to the number of sleepers 3-1 that need to be temporarily supported, a corresponding number of articulated grouting bags 1 are cut from the middle cutting line 1-3 of the connecting sleeve 1-2. The number of bag bodies 1-1 in each set of grouting bags corresponds to the number of sleepers 3-1 that need to be supported. That is, a corresponding number of bag bodies 1-1 are cut out and placed under the sleepers 3-1 that need to be temporarily supported.

[0055] For slab trackless tracks with three grouting holes 3-2 on the track slab 3 itself, each track slab 3 requires two sets of articulated grouting bags 1 and, if necessary, three multi-arm grouting bags 2. The three grouting ports are filled with grouting bags, and the bag arms 2-2 are placed under the track slab 3 through the grouting holes 3-2 of the ballastless track. For slab trackless tracks or other types of ballastless tracks that do not have grouting holes 3-2 on their own, two sets of articulated grouting bags 1 are required, but multi-arm grouting bags 2 are not needed.

[0056] In the above embodiment, preferably, the bag body 1-1 of the arthropod grouting bag 1 is provided with sequentially numbered 1-4. During use, the number of bag bodies 1-1 to be cut and the cutting position can be quickly determined according to the number 1-4.

[0057] This invention also proposes a temporary support method for operating high-speed railway ballastless track, utilizing the temporary support grouting bag for operating high-speed railway ballastless track disclosed in any of the above embodiments, comprising:

[0058] Based on the specifications of the ballastless track to be temporarily supported, determine the width of the connecting sleeve 1-2 and the number of bag bodies 1-1 required for the articulated grouting bag 1, and cut the required articulated grouting bag 1 to obtain the required articulated grouting bag 1. Determine the diameter of the central vertical bag 2-1 required for the multi-limb grouting bag 2.

[0059] After removing the filling layer 4 of the ballastless track, the segmented grouting bags 1 are placed under the track slab 3 that requires temporary support, so that the center position of each bag 1-1 is aligned with the center position of the corresponding sleeper 3-1. The central vertical bag 2-1 of the multi-leg grouting bag 2 is placed into the grouting hole 3-2 of the ballastless track, so that the bag segments 2-2 of the multi-leg grouting bag 2 are distributed around the grouting hole 3-2 under the track slab 3.

[0060] After the track slab 3 is finely adjusted into place, the fast-hardening and early-strength grout material is injected one by one or simultaneously through the grouting ports of the segmented grouting bag 1 and the multi-segment grouting bag 2 until the grout liquid level at the grouting port is higher than that of the track slab 3. Grouting is stopped when the grout solidifies and forms a temporary support for the ballastless track.

[0061] In the above embodiments, preferably, the temporary support method for operating high-speed railway ballastless track further includes:

[0062] After the temporary support function is completed, lift the track plate 3, remove the articular grouting bag 1 and the multi-limb grouting bag 2, and cut the articular grouting bag 1 at the connecting sleeve 1-2.

[0063] In the above embodiments, preferably, the slurry material is one or more of self-compacting concrete, self-leveling mortar, emulsified asphalt-cement composite mortar, polymer emulsion-cement composite mortar, resin mortar and polyurethane slurry, with a workability retention capacity of more than 10 minutes and a compressive strength of more than 1 MPa after 1 hour.

[0064] The temporary support grouting bag and temporary support method for operating ballastless track of high-speed railway disclosed in the above embodiments will be specifically described in the following examples.

[0065] Example 1

[0066] The cement asphalt mortar filling layer corresponding to three consecutive track slabs of a high-speed railway's longitudinally continuous ballastless track has severely deteriorated and needs to be replaced. However, due to the track maintenance window being less than 4 hours, to ensure that line operation is not affected, it is necessary to remove the damaged cement asphalt mortar filling layer and temporarily support the three track slabs first, followed by track slab tensioning, fine-tuning, and re-grouting of the filling layer mortar during subsequent maintenance windows. The technical solution of this invention is used to temporarily support track slab 3. The specific implementation is as follows:

[0067] (1) Based on the structural characteristics of the longitudinally connected slab type ballastless track slab 3, prepare segmented grouting bags 1 and multi-segment grouting bags 2 in advance. Both are made of high-strength, thin, breathable and leak-proof materials, and are composed of one or more woven or non-woven fabrics of polyester, spandex, polypropylene, nylon, acrylic, polyester, nylon and plant fiber. The bursting strength is greater than 1.4kN, the tearing strength is 0.28kN, the breaking strength is greater than 10kN / m, the thickness is less than 5mm, the air permeability is greater than 100mm / s, and the dry heat shrinkage rate is less than 10%. The material has sufficient strength and toughness as well as good air permeability.

[0068] (2) The segmental grouting bag 1 is composed of bag body 1-1 and connecting sleeve 1-2 continuously distributed at intervals. The center-to-center spacing of bag body 1-1 is determined to be 650mm based on the spacing of the ballastless track support platform. The thickness of bag body 1-1 after being fully filled is determined to be 50mm based on the temporary support height. The length of a single bag body 1-1 is 800mm and the width is 350mm. The bag body 1-1 is marked with consecutive numbered labels 1-60, corresponding to the 30 sleepers 3-1 that need to be temporarily supported by the three track slabs 3, i.e., 60 support platforms. The entire support area of ​​bag body 1-1 does not need to support the entire ballastless track, but only supports 43% of the ballastless track area.

[0069] (3) The multi-limb grouting bag 2 consists of a cylindrical bag body 1-1 and four bag limbs 2-2. The diameter of the bag body 1-1 is not less than the diameter of the grouting hole 3-2 of the track plate 3, and the height is not less than the thickness of the track plate 3; the diameter of the four bag limbs 2-2 is not less than the thickness of the filling layer 4 corresponding to the original grouting hole 3-2, which is determined to be 50mm, and the length is not less than 300mm.

[0070] (4) Based on the number of rail support platforms required for each temporary track slab 3, cut 6 sets of articulated grouting bags 1 at the middle cutting line 1-3 of the connecting sleeves 1-2 between the bag bodies numbered 10# to 11#, 20# to 21#, 30# to 31#, 40# to 41#, and 50# to 51#, respectively. Each set of articulated grouting bags 1 includes 10 bag bodies 1-1. Each track slab 3 requires 2 sets of articulated grouting bags 1; each track slab 3 has 3 grouting holes 3-2, requiring 3 multi-limb grouting bags 2.

[0071] (5) After removing the original mortar filling layer 4, temporarily support and finely adjust the track slab 3. Simultaneously, place two sets of segmented grouting bags 1 under the track slab 3 that requires temporary support, with the center of each bag 1-1 aligned with the center of the sleeper 3-1. Figure 4 As shown, insert the grouting funnel into the cut connecting sleeve 1-2 and tie it tightly for later use; place the bag legs 2-2 of the three multi-limb grouting bags 2 under the track plate 3 through the grouting hole 3-2 of the ballastless track, with the central vertical bag 2-1 located inside the grouting hole 3-2, insert the grouting funnel into the opening of the multi-limb grouting bag 2 and tie it tightly for later use.

[0072] (6) After the track slab 3 has been finely adjusted and the grouting bag 1 has been placed in the appropriate position, inject the fast-hardening and early-strength grout material into the segmented grouting bags 1 one by one or simultaneously through the grouting port, and inject the fast-hardening and early-strength grout material into the multi-segment grouting bags 2 one by one or simultaneously through the grouting port, until the liquid level in the funnel at the grouting port is higher than the surface of the track slab 3, then stop grouting. Figure 5 As shown, grouting is added as needed. After grouting, the grout material solidifies rapidly within 1 hour, positioning the temporary support for the ballastless track in the preset position.

[0073] Based on on-site online monitoring of indicators such as vertical vibration acceleration, horizontal acceleration, derailment coefficient, and wheel load reduction rate of the track slab, it was found that the temporary support track structure meets the requirements for the safe passage of high-speed trains, verifying that 43% temporary support of the track structure can meet the temporary support requirements of ballastless track slabs.

[0074] (7) After the temporary support function is completed, slightly lift the ballastless track to pull out the grouting bag along with the hardened grout material. Cut at the cut line 1-3 in the middle of each connecting sleeve 1-2, and then neatly stack the segmental grouting bag 1 and the hardened grout material. Figure 9 As shown, this is for easy removal from the site.

[0075] Example 2

[0076] The cement asphalt mortar filling layer corresponding to three consecutive track slabs of a high-speed railway's longitudinally continuous ballastless track has severely deteriorated and needs to be replaced. However, due to the track maintenance window being less than 4 hours, to ensure that line operation is not affected, it is necessary to remove the damaged cement asphalt mortar filling layer and temporarily support the three track slabs first, followed by track slab tensioning, fine-tuning, and re-grouting of the filling layer mortar during subsequent maintenance windows. The technical solution of this invention is used to temporarily support track slab 3. The specific implementation is as follows:

[0077] (1) Based on the structural characteristics of the longitudinally connected slab type ballastless track slab 3, prepare segmented grouting bags 1 and multi-segment grouting bags 2 in advance. Both are made of high-strength, thin, breathable and leak-proof materials, and are composed of one or more woven or non-woven fabrics of polyester, spandex, polypropylene, nylon, acrylic, polyester, nylon and plant fiber. The bursting strength is greater than 1.4kN, the tearing strength is 0.28kN, the breaking strength is greater than 10kN / m, the thickness is less than 5mm, the air permeability is greater than 100mm / s, and the dry heat shrinkage rate is less than 10%. The material has sufficient strength and toughness as well as good air permeability.

[0078] (2) The articulated grouting bag 1 is composed of bag body 1-1 and connecting sleeve 1-2 continuously distributed at intervals. The center-to-center spacing of bag body 1-1 is determined to be 650mm based on the spacing of the ballastless track support platform. The thickness of bag body 1-1 after being fully filled is determined to be 50mm based on the temporary support height. The length of a single bag body 1-1 is 900mm and the width is 400mm. The bag body 1-1 is marked with consecutive numbered labels 1-60, corresponding to the 12 sleepers 3-1 that need to be temporarily supported by the three track slabs 3, i.e., 24 support platforms. The entire support area of ​​bag body 1-1 does not need to support the entire ballastless track, but only supports 21% of the ballastless track area.

[0079] (3) The multi-limb grouting bag 2 consists of a cylindrical bag body 1-1 and four bag limbs 2-2. The diameter of the bag body 1-1 is not less than the diameter of the grouting hole 3-2 of the track plate 3, and the height is not less than the thickness of the track plate 3; the diameter of the four bag limbs 2-2 is not less than the thickness of the filling layer 4 corresponding to the original grouting hole 3-2, which is determined to be 50mm, and the length is not less than 300mm.

[0080] (4) Based on the number of rail support platforms required for each temporary track slab 3, cut 6 sets of articulated grouting bags 1 from the middle cutting line 1-3 of the connecting sleeves 1-2 between the bag bodies numbered 4# to 5#, 8# to 9#, 12# to 13#, 16# to 17#, 20# to 21#, and 24# to 25#, respectively. Each set of articulated grouting bags 1 includes 5 bag bodies 1-1. Each track slab 3 requires 2 sets of articulated grouting bags 1; each track slab 3 has 3 grouting holes 3-2, requiring 3 multi-limb grouting bags 2.

[0081] (5) After removing the original mortar filling layer 4, temporarily support and finely adjust the track slab 3. Simultaneously, place two sets of segmented grouting bags 1 at intervals of two sleepers under the track slab 3 that requires temporary support. The center of each bag 1-1 should be aligned with the center of each sleeper 3-1. Figure 6 As shown, insert the grouting funnel into the cut connecting sleeve 1-2 and tie it tightly for later use; place the bag legs 2-2 of the three multi-limb grouting bags 2 under the track plate 3 through the grouting hole 3-2 of the ballastless track, with the central vertical bag 2-1 located inside the grouting hole 3-2, insert the grouting funnel into the opening of the multi-limb grouting bag 2 and tie it tightly for later use.

[0082] (6) After the track slab 3 has been finely adjusted and the grouting bag 1 has been placed in the appropriate position, inject the fast-hardening and early-strength grout material into the segmented grouting bags 1 one by one or simultaneously through the grouting port, and inject the fast-hardening and early-strength grout material into the multi-segment grouting bags 2 one by one or simultaneously through the grouting port, until the liquid level in the funnel at the grouting port is higher than the surface of the track slab 3, then stop grouting. Figure 7 and Figure 8 As shown, grouting is added as needed. After grouting, the grout material solidifies rapidly within 1 hour, positioning the temporary support for the ballastless track in the preset position.

[0083] Based on on-site online monitoring of indicators such as vertical vibration acceleration, horizontal acceleration, derailment coefficient, and wheel load reduction rate of the track slab, it was found that the temporary support track structure meets the requirements for the safe passage of high-speed trains, verifying that a temporary support of 21% for the track structure can meet the temporary support requirements for ballastless track slabs.

[0084] (7) After the temporary support function is completed, slightly lift the ballastless track to pull out the grouting bag along with the hardened grout material. Cut at the cut line 1-3 in the middle of each connecting sleeve 1-2, and then neatly stack the segmental grouting bag 1 and the hardened grout material. Figure 9 As shown, this is for easy removal from the site.

[0085] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A temporary support grouting bag for operating ballastless track of high-speed railway, characterized in that, include: Arthropod grouting bags and multi-limb grouting bags; The articulated grouting bag includes a bag body and a connecting sleeve. The bag body and the connecting sleeve are continuously connected at intervals to form an articulated structure. The bag body and the connecting sleeve are interconnected, so that the grout can be filled into each bag body. The width of the connecting sleeve is determined by a combination of the width of the bag body and the sleeper spacing of the ballastless track, so that the sleepers below are all supported by the grout-filled bag body. The multi-limb grouting bag includes a central vertical bag and bag limbs. The central vertical bag is vertically arranged, and at least three bag limbs are horizontally distributed and connected around the central vertical bag to form a multi-limb structure. The central vertical bag and the bag limbs are interconnected, so that the grout injected into the central vertical bag can fill each bag limb.

2. The temporary support grouting bag for operating high-speed railway ballastless track according to claim 1, characterized in that, The segmental grouting bag is used to be placed into the cavity formed by removing the filling layer of the ballastless track, and the injected fast-hardening and early-strength grout material solidifies to provide support for the sleeper. The multi-limb grouting bag is used for the grouting hole of the ballastless track. The central vertical bag is placed in the grouting hole, and the bag limbs are placed in the cavity below the track slab. After the injected fast-hardening and early-strength grout material is cured, it forms a supporting effect on the grouting hole and plays a longitudinal and lateral limiting role on the track slab.

3. The temporary support grouting bag for operating high-speed railway ballastless track according to claim 1, characterized in that, The arthropod grouting bag and the multi-limb grouting bag are made of one or more woven or nonwoven fabrics selected from spandex, polypropylene, acrylic, polyester fiber and plant fiber, with a bursting strength greater than 1.4kN, a tearing strength greater than 0.28kN, a thickness less than 5mm, an air permeability greater than 100mm / s, and a dry heat shrinkage rate less than 10%.

4. The temporary support grouting bag for operating high-speed railway ballastless track according to claim 2, characterized in that, The center of the bag is aligned with the center of the sleeper. The full-filled support area of ​​the bag is 20% to 50% of the ballastless track area, and the full-filled thickness of the bag is not less than the height that needs to be supported. The central vertical bag has a cylindrical structure, the diameter of which is not less than the diameter of the grouting hole, the height of which is not less than the thickness of the track plate, and the diameter of the bag limb is not less than the height that needs to be supported.

5. The temporary support grouting bag for operating high-speed railway ballastless track according to claim 2, characterized in that, The segmental grouting bag uses the holes formed by the cut-off portions of the connecting sleeves on both sides of the ballastless track as grouting ports, while the multi-limb grouting bag uses the top of the central vertical bag as the grouting port.

6. The temporary support grouting bag for operating high-speed railway ballastless track according to claim 5, characterized in that, The arthropod grouting bag has a cutting line in the middle of the connecting sleeve, so that the continuously connected arthropod grouting bags can be easily cut into suitable specifications.

7. The temporary support grouting bag for operating high-speed railway ballastless track according to claim 5, characterized in that, The arthropod grouting bag has sequentially numbered labels on its body.

8. A temporary support method for operating ballastless track of a high-speed railway, characterized in that, The temporary support grouting bag for operating high-speed railway ballastless track as described in any one of claims 1 to 7 includes: Based on the specifications of the ballastless track to be temporarily supported, determine the required width of the connecting sleeve and the number of bags for the articulated grouting bags, and cut the required articulated grouting bags to obtain the required diameter of the center vertical bag of the required multi-limb grouting bags. After the filling layer of the ballastless track is removed, the segmented grouting bags are placed under the track slab that needs temporary support, so that the center position of each bag is aligned with the center position of the corresponding sleeper, and the central vertical bag of the multi-leg grouting bag is placed into the grouting hole of the ballastless track, so that the segments of the multi-leg grouting bag are distributed around the grouting hole under the track slab. After the track slab is precisely adjusted, fast-hardening and early-strength grout material is injected one by one or simultaneously through the grouting ports of the segmental grouting bags and the multi-segment grouting bags until the grout level at the grouting port is higher than the track slab. Grouting is then stopped, and the grout solidifies to form temporary support for the ballastless track.

9. The temporary support method for operating ballastless track of high-speed railway according to claim 8, characterized in that, Also includes: After the temporary support function is completed, the track plate is lifted, the articular grouting bag and the multi-limb grouting bag are removed, and the articular grouting bag is cut off from the connecting sleeve.

10. The temporary support method for operating ballastless track of high-speed railway according to claim 8, characterized in that, The grout material is one or more of the following: self-compacting concrete, self-leveling mortar, emulsified asphalt-cement composite mortar, polymer emulsion-cement composite mortar, resin mortar, and polyurethane grout. It has a workability retention capacity of more than 10 minutes and a compressive strength of more than 1 MPa after 1 hour.

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