A form bag for filling with foamed lightweight soil

Abstract

The utility model discloses a kind of for filling foam light soil's mould bag, belong to underground space backfill construction technical field, including mould bag body, the mould bag inside is provided with three-dimensional reinforcing structure, the three-dimensional reinforcing structure includes horizontal reinforcing unit and vertical reinforcing unit, the mould bag upper surface is equipped with loading structure, for realizing the perfusion and sealing of foam light soil.The utility model uses above-mentioned a kind of for filling foam light soil's mould bag, by using the way of mould bag filling foam light soil, foam light soil arc structure is conveniently and quickly formed, and by virtue of mould bag good flexibility and tear resistance and its inside three-dimensional reinforcing structure, surface setting loading structure, not only constrain foam light soil forming ideal arch, also strengthen its integrity, make the high strength, low density advantage of foam light soil be able to give full play.

Description

Technical Field

[0001] This utility model relates to the field of underground space backfilling construction technology, and in particular to a formwork bag for filling foamed lightweight soil. Background Technology

[0002] In the field of underground space construction, the quality of backfilling construction for buried pipeline projects is crucial to the long-term stable operation of the pipeline. Traditional backfilling processes often involve layered backfilling and compaction of ordinary soil. However, ordinary soil has problems such as difficulty in controlling the uniformity of compaction and susceptibility to groundwater erosion leading to settlement. Especially in arched backfill structures, uneven lateral deformation and vertical load distribution of the soil can easily cause cracking of the soil around the pipeline, affecting pipeline safety.

[0003] In existing technologies, traditional foamed lightweight soil is difficult to precisely control in terms of filling location and quantity, resulting in significant material waste and high construction costs. Regarding structural performance, the design focus of traditional formwork bags is primarily on limiting material shape and facilitating installation, lacking structural coordination with the internal filling material and failing to provide substantial reinforcement. Therefore, when foamed lightweight soil is filled into traditional formwork bags, its ability to constrain lateral deformation and transfer vertical loads is limited, making it difficult to form a more stable arched load-bearing system, effectively distributing the load at the top of the pipeline, and failing to meet higher requirements for engineering safety and durability. Utility Model Content

[0004] The purpose of this invention is to provide a formwork bag for filling lightweight foam soil. By using a formwork bag to fill lightweight foam soil, an arched structure of lightweight foam soil can be formed conveniently and quickly. Furthermore, thanks to the good flexibility and tear resistance of the formwork bag, along with its internal three-dimensional reinforcement structure and surface filling structure, it not only constrains the lightweight foam soil to form an ideal arch shape but also enhances its overall integrity, allowing the high strength and low density advantages of lightweight foam soil to be fully utilized.

[0005] To achieve the above objectives, this utility model provides a mold bag for filling foamed lightweight soil, including a mold bag body, a three-dimensional reinforcement structure inside the mold bag, the three-dimensional reinforcement structure including a horizontal reinforcement unit and a vertical reinforcement unit, and a filling structure on the upper surface of the mold bag for realizing the injection and sealing of foamed lightweight soil.

[0006] Preferably, the lateral reinforcement unit includes several layers of horizontal reinforcing mesh, which is a fiber mesh structure, laid in layers along the height direction of the geotextile body, with a layer spacing of 0.2-0.4m, to constrain the lateral deformation of the foamed lightweight soil and enhance the horizontal tensile strength of the geotextile body.

[0007] Preferably, the vertical reinforcement unit includes a first reinforcement component and a second reinforcement component symmetrically arranged on both sides of the arch axis inside the body of the mold bag; the first reinforcement component and the second reinforcement component each include an arch top reinforcement bar, an arch waist reinforcement bar, and an arch foot reinforcement bar, the arch top reinforcement bar, the arch waist reinforcement bar, and the arch foot reinforcement bar are all spiral flexible reinforcing bars, and are obliquely arranged at a predetermined angle relative to the vertical central axis of the mold bag, and the angle of inclination increases sequentially from the arch top to the arch foot.

[0008] Preferably, the spiral axes of the arch crown reinforcement, the arch waist reinforcement, and the arch foot reinforcement all penetrate through the through holes on the surface of the corresponding layer of horizontal reinforcing mesh and are fixed by cable ties to ensure that the reinforcement does not slip relative to each other when under stress.

[0009] The upper end of the arch reinforcement bar is connected to the pre-embedded ring anchor fastener on the upper inner surface of the mold bag, and the lower end is connected to the ring anchor fastener on the lower inner surface of the mold bag.

[0010] The upper end of the arch waist reinforcing bar is locked to the ring anchor fastener pre-embedded on the inner surface of the upper side of the mold bag, and the lower end is fixedly connected to the foundation anchor fastener on the outer surface of the mold bag.

[0011] The upper end of the arch foot reinforcing bar is locked to the ring anchor pre-embedded on the inner surface of the upper side of the mold bag, and the lower end is fixedly connected to the base anchor on the lower outer surface of the bottom of the mold bag.

[0012] Both the base anchor and the foundation anchor are tapered structures with a cone angle of 60°. ° -90 ° The cone base diameter is 80-120mm and the cone height is 50-80mm, used to enhance anchoring force and reduce disturbance to the foundation.

[0013] Preferably, the angle between the arch reinforcement and the vertical centerline of the formwork is 10°. ° -25 ° It is used to resist the vertical load of the arch crown; the angle between the arch waist reinforcement and the vertical centerline of the formwork is 25 degrees. ° -40 ° It is used to transmit the shear force of the arch body; the angle between the arch foot reinforcing bar and the vertical center axis of the formwork bag is 40 degrees. ° -60 ° It is used to resist the horizontal thrust of the arch foot; the arch crown reinforcement, the arch waist reinforcement, and the arch foot reinforcement form a 15-degree angle with each other. ° -25 ° The gradient difference and the consistent spiral direction, and the net distance between adjacent reinforcing bars on the horizontal projection plane are greater than or equal to 2 times the spiral diameter, to avoid interfering with the flow of lightweight soil.

[0014] Preferably, the filling structure includes an inlet and a cover. The inlet is a tubular structure with its lower end opening through the mold bag and communicating with the interior, and its upper end fixedly connected with an annular connecting ring.

[0015] The lower surface of the connecting ring is sealed and fixed to the upper surface of the feed port. An elastic button is circumferentially provided on the outer surface of the connecting ring. An annular groove is formed on the upper surface of the connecting ring. A magnet array is embedded at the bottom of the annular groove, and a slot is formed on the side wall. One end of the button passes through the outer surface of the connecting ring and extends into the slot. A reset spring is provided between the button and the inner wall of the slot. The side of the button located inside the connecting ring has an inclined guide structure.

[0016] The lower surface of the cover is provided with a metal annular protrusion that matches the annular groove, and a wedge-shaped buckle is provided on the outer surface of the protrusion corresponding to the slot position; the buckle is embedded in the buckle groove on the surface of the annular protrusion and is connected to the bottom of the groove through an elastic member, and can elastically expand and contract along the groove.

[0017] Therefore, this utility model employs a formwork bag for filling foamed lightweight soil, featuring a three-dimensional reinforcement structure. The horizontal reinforcing mesh of the transverse reinforcement units is laid in layers, effectively constraining the transverse deformation of the foamed lightweight soil and enhancing the horizontal tensile strength of the formwork bag. The vertical reinforcement units have different angles for each reinforcing bar according to the stress characteristics of the arch structure, respectively resisting the vertical load at the arch crown, transmitting the shear force of the arch body, and resisting the horizontal thrust at the arch foot. Furthermore, through reasonable connection methods and anchors, the reinforcement bars are ensured not to slip under stress, enhancing the anchoring force. The filling structure enables rapid connection and sealing of the material conveying pipeline, preventing leakage of foamed lightweight soil and air ingress during filling, thus ensuring filling quality. Using this formwork bag to fill foamed lightweight soil allows for convenient and rapid formation of a foamed lightweight soil arch structure, ensuring the accuracy and compaction of the formwork bag laying and foamed lightweight soil filling, and improving the quality and stability of the entire backfilling project.

[0018] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a mold bag for filling lightweight foam soil according to this utility model;

[0020] Figure 2 This is a cross-sectional view of a mold bag for filling foamed lightweight soil according to the present invention;

[0021] Figure 3 This is a front view of a mold bag for filling foamed lightweight soil according to this utility model;

[0022] Figure 4 This utility model relates to a mold bag for filling lightweight foam soil. Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a cross-sectional view of the inlet of a mold bag for filling foamed lightweight soil according to this utility model;

[0024] Figure 6 This is a schematic diagram illustrating the application of a mold bag for filling lightweight foam soil according to this utility model.

[0025] Figure Labels

[0026] 1. Molded bag; 2. Three-dimensional reinforcement structure; 21. Horizontal reinforcement unit; 211. Horizontal reinforcing mesh; 2111. Through hole; 2112. Cable tie; 22. Vertical reinforcement unit; 221. First reinforcement component; 222. Second reinforcement component; 223. Arch top reinforcement bar; 224. Arch waist reinforcement bar; 225. Arch foot reinforcement bar; 3. Loading structure; 31. Inlet; 32. Annular connecting ring; 33. Button; 34. Groove; 35. Slot; 36. Cover; 361. Protrusion; 362. Buckle; 4. Ring anchor; 5. Basic anchor; 6. Base anchor. Detailed Implementation

[0027] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0028] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] like Figures 1-2As shown, a formwork bag 1 for filling foamed lightweight soil includes a formwork bag 1 body made of high-strength fiber fabric, preferably polyester fiber fabric, with a waterproof layer added in the middle layer. The waterproof layer is a polyvinyl chloride film, which is fixed to the middle of the fiber fabric through a bonding process, giving the formwork bag 1 good flexibility and tear resistance, while preventing water penetration and affecting the performance of the foamed lightweight soil. The formwork bag 1 has a three-dimensional reinforcement structure 2 inside, including a horizontal reinforcement unit 21 and a vertical reinforcement unit 22. The upper surface of the formwork bag 1 has a filling structure 3 for injecting and sealing the foamed lightweight soil.

[0030] like Figures 3-4 As shown, the horizontal reinforcing mesh 211 of the transverse reinforcing unit 21 is a fiber mesh structure, made of polypropylene fiber mesh, and laid in layers along the height direction of the body of the mold bag 1, with a preferred layer spacing of 0.3m. It is fixed to the inner wall of the body of the mold bag 1 by sewing or bonding. Each layer of horizontal reinforcing mesh 211 has through holes 2111 on its surface that are adapted to the reinforcing ribs of the vertical reinforcing unit 22. The position of the through holes 2111 is determined according to the spiral axis of the vertical reinforcing ribs.

[0031] The first and second reinforcement components 221 of the vertical reinforcement unit 22 are symmetrically arranged on both sides of the arch axis inside the body of the mold bag 1. The arch top reinforcement rib 223, the arch waist reinforcement rib 224, and the arch foot reinforcement rib 225 are all spiral flexible reinforcement ribs, which can be made of polyester fiber rope or aramid tape to adapt to the deformation of the mold bag 1, disperse stress, and enhance torsional and shear resistance. Its spiral structure increases the contact area, improves the interface friction, and is corrosion-resistant, easy to construct, and combines economy and durability. The angle between the arch top reinforcement rib 223 and the vertical central axis of the mold bag 1 is 15°, the angle between the arch waist reinforcement rib 224 and the arch foot reinforcement rib 225 is 30°, forming a gradient difference of 20°, and the spiral direction is consistent. The upper end of the arch reinforcement 223 is locked to the upper inner surface of the formwork bag 1 via a ring anchor 4, which is a metal ring embedded in the upper inner surface of the formwork bag 1. The lower end is locked to a ring anchor on the outer surface of the formwork bag 1, which is also a metal ring and fixed to the outer surface of the formwork bag 1. The lower end of the arch waist reinforcement 224 is fixedly connected to the foundation anchor 5, which is a conical structure with a cone angle of 75°, a cone base diameter of 100mm, and a cone height of 60mm, and is fixed to the outer surface of the formwork bag 1 by pre-embedding. The lower end of the arch foot reinforcement 225 is fixedly connected to the base anchor 6, which is also a conical structure with the same parameters as the base anchor 5, and is fixed to the lower outer surface of the bottom of the formwork bag 1. Each reinforcing rib and the horizontal reinforcing mesh 211 are fixed by cable ties 2112. The cable ties 2112 are high-strength nylon cable ties 2112, which pass through the through holes 2111 to firmly bind the reinforcing ribs and the horizontal reinforcing mesh 211, ensuring that the ribs do not slip relative to each other when under stress.

[0032] like Figure 5As shown, the material inlet 31 of the material structure is a tubular structure made of metal, with its lower opening communicating with the inside of the mold bag 1, and its upper end fixedly connected to an annular connecting ring 32. The lower surface of the connecting ring and the upper surface of the material inlet 31 are sealed and fixed by welding. Two elastic buttons 33 are evenly arranged circumferentially on the outer surface of the connecting ring. One end of the button 33 extends through the outer surface of the connecting ring into the inside of the slot 35, which is opened on the side wall of the connecting ring. A return spring is set between the button 33 and the inner wall of the slot 35. The side of the button 33 located inside the connecting ring has a sloping guide structure to facilitate the push of the button 33 to retract when the material conveying pipe connection end is inserted. A magnet array is embedded in the bottom of the annular groove 34. The magnet array consists of multiple small magnets evenly distributed for pre-positioning of the material conveying pipe connection end. The metal annular protrusion 361 on the lower surface of the cover 36 is adapted to the annular groove 34. A wedge-shaped buckle 362 is provided on the outer surface of the protrusion 361 corresponding to the position of the slot 35. The buckle 362 is embedded in the buckle 362 groove 34 on the surface of the protrusion 361 and is connected to the bottom of the groove 34 by an elastic component such as a spring, so as to realize the elastic extension and contraction of the buckle 362. During loading, the connecting end of the conveying pipe has a metal piece that cooperates with the magnet array. When it approaches the connecting ring, it is pre-positioned by the magnet, and the connecting end of the pipe is snapped into the slot 35 to realize the fixed connection between the pipe and the connecting ring. After the material is conveyed, the button 33 is pressed to separate the pipe from the connecting ring. Then, the annular protrusion 361 of the cover 36 is aligned with the annular groove 34 and pressed down. The wedge-shaped buckle 362 is squeezed back by the groove 34, enters the slot 35 and elastically resets. The buckle 362 and the slot 35 are engaged to achieve a seal.

[0033] Working principle:

[0034] Determination and Preparation of Formwork Bag 1 Parameters: Based on the design dimensions of the arched backfill structure, the required length of formwork bag 1 is accurately measured using measuring instruments, such as measuring the span and height of the arch using a total station, and calculating the unfolded length of formwork bag 1. When designing the thickness of formwork bag 1, the filling pressure of the foamed lightweight soil and the load-bearing capacity of formwork bag 1 are considered, and a thickness of 5-8mm is preferred. High-strength fiber fabric is cut to the required size using cutting equipment, a waterproof layer is added to the middle layer, and formwork bag 1 is prepared by sewing or hot pressing.

[0035] Foundation backfilling construction: At the buried pipeline project site, the construction site is cleared, and debris and loose soil layers are removed. According to design requirements, ordinary soil is backfilled in layers using excavators or loaders. After each layer is backfilled, a vibratory roller is used to compact the soil until the soil density meets design requirements. The compaction is then tested using a density testing instrument such as a ring compactor. Gradually, an arched backfill foundation structure that meets design requirements is formed. Figure 6 As shown.

[0036] Installation of Formwork Bag 1: On the formed arched backfill foundation, determine the installation position of Formwork Bag 1 according to the design drawings and use measuring tools for positioning. Unfold the prepared Formwork Bag 1 and start laying it from the bottom of the arch, ensuring that Formwork Bag 1 fits tightly with the arched backfill. Fix the edges of Formwork Bag 1 with sandbags or temporary anchors to prevent it from shifting during installation.

[0037] Preparation and Filling of Foamed Lightweight Soil: Foamed lightweight soil preparation equipment, including a mixer, foaming agent storage tank, and water supply system, is set up at the construction site. According to the designed mix proportions, cement, sand, and other aggregates are first added to the mixer, followed by water and foaming agent. The mixture is thoroughly stirred to prepare foamed lightweight soil with suitable fluidity and strength. The foamed lightweight soil is then pumped into the formwork bag 1 through the inlet 31 of the filling structure 3, ensuring uniform and continuous injection until the formwork bag 1 is fully filled. During the filling process, a designated person observes the expansion of the formwork bag 1 to ensure compaction and prevent voids or localized overfilling.

[0038] Subsequent construction: Once the foamed lightweight soil inside formwork bag 1 reaches the initial strength required by the design, generally 24-48 hours after pouring, the strength is tested using a strength testing instrument such as a rebound hammer. After reaching the required strength, the temporary fixing devices at the edge of formwork bag 1 are removed, and pipeline backfilling and related construction procedures are carried out in accordance with the engineering construction specifications.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A formwork bag for filling lightweight foam soil, characterized in that: The device includes a mold bag body, and the interior of the mold bag is provided with a three-dimensional reinforcement structure, which includes a horizontal reinforcement unit and a vertical reinforcement unit. The upper surface of the mold bag is provided with a filling structure for injecting and sealing the foamed lightweight soil.

2. A formwork bag for filling lightweight foam soil according to claim 1, characterized in that: The lateral reinforcement unit includes several layers of horizontal reinforcing mesh. The reinforcing mesh is a fiber mesh structure, laid in layers along the height direction of the geotextile body with a layer spacing of 0.2-0.4m. It is used to restrain the lateral deformation of the foamed lightweight soil and enhance the horizontal tensile strength of the geotextile body.

3. A formwork bag for filling lightweight foam soil according to claim 2, characterized in that: The vertical reinforcement unit includes a first reinforcement component and a second reinforcement component symmetrically arranged inside the body of the mold bag along both sides of the arch axis; the first reinforcement component and the second reinforcement component each include several sets of arch top reinforcement ribs, several sets of arch waist reinforcement ribs, and several sets of arch foot reinforcement ribs. The arch top reinforcement ribs, the arch waist reinforcement ribs, and the arch foot reinforcement ribs are all spiral flexible reinforcing ribs, and are obliquely arranged at a predetermined angle relative to the vertical central axis of the mold bag, and the angle of inclination increases sequentially from the arch top to the arch foot.

4. A formwork bag for filling lightweight foam soil according to claim 3, characterized in that: The spiral axes of the arch crown reinforcement, the arch waist reinforcement, and the arch foot reinforcement all penetrate through the through holes on the surface of the corresponding layer of horizontal reinforcing mesh and are fixed by cable ties to ensure that the reinforcement does not slip relative to each other when under stress. The upper end of the arch reinforcement bar is connected to the pre-embedded ring anchor fastener on the upper inner surface of the mold bag, and the lower end is connected to the ring anchor fastener on the lower inner surface of the mold bag. The upper end of the arch waist reinforcing bar is locked to the ring anchor pre-embedded on the inner surface of the upper side of the mold bag, and the lower end is fixedly connected to the foundation anchor on the outer surface of the mold bag. The upper end of the arch foot reinforcing bar is locked to the ring anchor pre-embedded on the inner surface of the upper side of the mold bag, and the lower end is fixedly connected to the base anchor on the lower outer surface of the bottom of the mold bag. Both the base anchor and the foundation anchor are tapered structures with a cone angle of 60°. ° -90 ° The cone base diameter is 80-120mm and the cone height is 50-80mm, used to enhance anchoring force and reduce disturbance to the foundation.

5. A formwork bag for filling lightweight foam soil according to claim 4, characterized in that: The angle between the arch reinforcement and the vertical centerline of the formwork is 10°. ° -25 ° It is used to resist the vertical load of the arch crown; the angle between the arch waist reinforcement and the vertical centerline of the formwork is 25 degrees. ° -40 ° It is used to transmit the shear force of the arch body; the angle between the arch foot reinforcing bar and the vertical center axis of the formwork bag is 40 degrees. ° -60 ° It is used to resist the horizontal thrust of the arch foot; the arch crown reinforcement, the arch waist reinforcement, and the arch foot reinforcement form a 15° interval with each other. ° -25 ° The gradient difference and the consistent spiral direction, and the net distance between adjacent reinforcing bars on the horizontal projection plane are greater than or equal to 2 times the spiral diameter, to avoid interfering with the flow of lightweight soil.

6. A formwork bag for filling lightweight foam soil according to claim 5, characterized in that: The loading structure includes an inlet and a cover. The inlet is a tubular structure with an opening at the lower end that penetrates the mold bag and communicates with the inside, and an annular connecting ring is fixedly connected to the upper end. The lower surface of the connecting ring is sealed and fixed to the upper surface of the feed port. An elastic button is circumferentially provided on the outer surface of the connecting ring. An annular groove is formed on the upper surface of the connecting ring. A magnet array is embedded at the bottom of the annular groove, and a slot is formed on the side wall. One end of the button passes through the outer surface of the connecting ring and extends into the slot. A reset spring is provided between the button and the inner wall of the slot. The side of the button located inside the connecting ring has an inclined guide structure. The lower surface of the cover is provided with a metal annular protrusion that matches the annular groove, and a wedge-shaped buckle is provided on the outer surface of the protrusion corresponding to the slot position; the buckle is embedded in the buckle groove on the surface of the annular protrusion and is connected to the bottom of the groove through an elastic member, and can elastically expand and contract along the groove.

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