Self-expansion micro-permeation flexible formwork assembly, raw soil block wall and construction method

Abstract

The embodiment of the invention relates to a self-expansion micro-permeation flexible formwork assembly, a raw soil block wall and a construction method, and the self-expansion micro-permeation flexible formwork assembly comprises a center positioning ring, a radial self-expansion framework and a flexible filter layer; the inner diameter of the central positioning ring is matched with the diameter of the vertical steel bar, so that the central positioning ring and the vertical steel bar are coaxial and are in sliding fit connection; the radial self-expansion framework is arranged on the periphery of the central positioning ring; the radial self-expansion framework comprises a supporting framework and radial flexible spokes, and the outer diameter size of the supporting framework is matched with the diameter of a hole reserved in a raw soil building block, so that the self-expansion micro-permeation flexible formwork assembly can be attached to the inner wall of the hole after being expanded; one end of each radial flexible spoke is connected with the supporting framework, and the other end of each radial flexible spoke is connected with the central positioning ring; the flexible filter layer wraps the outer side of the supporting framework and is attached to the inner wall of a hole reserved in the raw soil building block.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building technology, in particular to a self-expanding micro-permeable flexible formwork assembly, raw-soil block wall and construction method. BACKGROUND

[0002] Nowadays, modern raw-soil building technology with green environmental protection, low carbon energy saving and excellent thermal performance has been rapidly developed and widely applied.

[0003] Fiber-reinforced raw-soil interlocking block is a prefabricated unit made of raw soil as base material, mixed with plant fibers (such as wheat straw, sisal, etc.) for toughening and modified curing. Its standard geometric size is usually 240mm long, 120mm wide and 90mm high. The block structure design is unique, with a vertical through-hole of d=40mm diameter in the center for forming a core column channel. To achieve self-embedding and precise positioning between blocks, the upper and lower surfaces of the block are provided with a matching "mortise and tenon" interlocking structure, including a convex rib of height h=10mm and a corresponding groove, with a rib thickness t=20mm. This special geometric configuration allows the block to automatically center when stacked, and provides effective in-plane shear resistance using the convex rib.

[0004] The wall built based on the above-mentioned block is mainly used in new rural green farmhouses and low-rise ecological buildings as the main load-bearing and enclosure structure. The wall construction usually adopts dry stacking or thin mortar joint masonry technology, which uses the mortise and tenon interlocking mechanism of the block to resist horizontal shear force. In order to meet the seismic fortification requirements, a hidden net-like skeleton is constructed inside the wall: using the continuous cavity formed by the vertical holes of the blocks aligned up and down, vertical steel bars are implanted inside and high-flow concrete or mortar is poured to form a seismic core column, and at the same time, horizontal ring beams or tie beams are used to form a "reinforced concrete-raw-soil block" collaborative stress system. This structure not only retains the livable characteristics of raw-soil materials such as winter warmth and summer coolness, but also significantly improves the overall strength and ductility through the internal skeleton, solving the problem of poor seismic performance of traditional raw-soil houses.

[0005] However, under the existing construction technology, such wall body faces severe challenges. First, due to the reserved hole diameter of the block being only 40 mm, the internal space is extremely narrow, and a single vertical steel bar is extremely prone to deviation under the impact of grouting and is tightly attached to the hole wall, resulting in complete failure of the steel bar protective layer and steel bar corrosion, which seriously weakens the holding force and seismic performance of the core column. Second, the raw-soil block is mostly dry-stacked, and the joint has poor air tightness. The slurry is extremely easy to seep outwards through the horizontal gap of the block during grouting, not only causing serious wall pollution and being difficult to clean up, but also causing the core column to have hollowing and segregation. In addition, the raw-soil material has strong hydrophilicity, and direct grouting will cause the raw-soil to absorb water and soften and the concrete to lose water and "burn the core". If a traditional rigid sleeve is used for isolation, the mechanical connection between the core column and the wall body will be completely cut off, resulting in the two being unable to work together. The following shortcomings exist: first, serious slurry leakage: the size accuracy of the raw-soil block is poor, and the masonry mortar joint is difficult to completely compact. When high-flow self-compacting slurry is grouted, the slurry is extremely easy to seep to the wall surface through the mortar joint, which not only wastes materials but also pollutes the wall body. Second, steel bar deviation (protective layer failure): in the deep hole, a single steel bar lacks support and is extremely prone to falling and attaching to the hole wall. The steel bar has no concrete protective layer on one side, is prone to corrosion, and cannot play a role in seismic pull connection. Third, the seismic performance is limited: a single steel bar lacks the constraint of horizontal stirrups. Under the action of an earthquake, the core column concrete is prone to crushing, and the smooth hole wall has limited adhesion with the concrete, which is prone to debonding. Fourth, if a PVC pipe is used as an inner lining to prevent leakage, it will completely isolate the adhesion between the concrete and the raw-soil, causing "separation of bone and flesh", and seriously weakening the integrity of the wall body. SUMMARY

[0006] The purpose of the present application is to overcome the defects of the prior art and provide a self-expanding micro-permeable flexible formwork assembly, a raw-soil block wall body and a construction method.

[0007] To achieve the above-mentioned purpose, in a first aspect, the present application provides a self-expanding micro-permeable flexible formwork assembly, comprising: a central positioning ring, a radial self-expanding framework and a flexible filter layer. The inner diameter of the central positioning ring matches the diameter of the vertical steel bar, so that the central positioning ring is coaxial with the vertical steel bar and is connected in a sliding fit. The radial self-expanding framework is arranged on the outer periphery of the central positioning ring and is used to change the self-expanding micro-permeable flexible formwork assembly from a radially compressed storage state to a radially expanded working state; the radial self-expanding framework comprises a support framework and a radial flexible spoke, the outer diameter of the support framework matches the diameter of the hole reserved by the raw-soil block, so that the self-expanding micro-permeable flexible formwork assembly can be attached to the inner wall of the hole after expansion; one end of the radial flexible spoke is connected to the support framework, and the other end is connected to the central positioning ring. The flexible filter layer is wrapped around the outside of the support frame and attached to the inner wall of the pre-reserved holes in the raw soil block. It has micropores for the fluid portion of the slurry to seep out and the solid aggregate to be filtered.

[0008] Preferably, the supporting frame has a spiral structure.

[0009] Preferably, the support frame is made of any one of spring steel wire, nylon, or polycarbonate.

[0010] Preferably, the radial flexible spokes are made of steel wire.

[0011] Preferably, the pore size of the micropore is 0.1mm-0.5mm.

[0012] Preferably, the flexible filter layer is made of either alkali-resistant fiberglass mesh or non-woven fabric.

[0013] Preferably, the connection between the flexible filter layer and the support frame is achieved by methods such as interlacing weaving, hot melt adhesive bonding, snap fastening, and sewing.

[0014] In a second aspect, the present invention provides a raw earth block wall, the raw earth block wall comprising the self-expanding micro-permeable flexible mold shell assembly described in any of the first aspects above, vertical steel bars and a certain number of raw earth blocks; The raw earth blocks have vertical holes, and the raw earth blocks are arranged vertically so that the vertical holes form vertical channels; The vertical reinforcing bars are inserted into the vertical channel; The self-expanding micro-permeable flexible mold shell assembly is sleeved on the outside of the vertical reinforcing bars.

[0015] Thirdly, the present invention provides a construction method for a rammed earth block wall as described in the second aspect above, the construction method comprising: Vertical reinforcing bars are installed on the top surface of the ground beam at preset intervals; The earthen block wall is constructed so that the vertical holes of the upper and lower earthen blocks form a continuous vertical channel, and the vertical steel bars are inserted into the vertical channel; The self-expanding micro-permeable flexible mold shell assembly is inserted from the top of the vertical steel bar and lowered into the vertical channel; Release the self-expanding micro-permeable flexible mold shell assembly, causing the self-expanding micro-permeable flexible mold shell assembly to expand radially and change to a working state. The outer wall of the self-expanding micro-permeable flexible mold shell assembly is pressed against the inner wall of the vertical channel, while the vertical steel bar is fixed to the geometric center of the vertical channel through the central positioning ring of the self-expanding micro-permeable flexible mold shell assembly. Grout is injected into the vertical channel to form core column concrete; wherein, under injection pressure, the fluid components of the grout partially seep out of the flexible filter layer of the self-expanding micro-permeable flexible mold shell assembly to form a micro-permeable mechanical bonding interface, and the solid aggregate is constrained inside the flexible filter layer. After the grout solidifies, the self-expanding micro-permeable flexible mold shell assembly forms the stirrups of the core column.

[0016] Preferably, the slurry is one or both of self-compacting fine aggregate concrete or cement-based mortar.

[0017] This invention provides a self-expanding micro-permeable flexible formwork assembly. Through the central positioning ring, the vertical reinforcing bars are coaxially positioned within the burlap block's opening, ensuring the concrete protects the bars and solving the problem of fixing single reinforcing bars. This eliminates the need for manual reinforcement cage binding and reduces the construction difficulty of small-diameter core columns. The supporting frame allows the self-expanding micro-permeable flexible formwork assembly to expand radially within the opening, opening the outer flexible filter layer and ensuring it adheres tightly to the opening wall. The central positioning ring is bounded by radial flexible spokes 22, forcibly fixing the vertical reinforcing bars to the geometric center of the opening. When grout is injected into the opening, some of the liquid in the grout permeates through the micropores of the flexible filter layer, forming a bonding interface with the burlap block. Solid aggregate in the grout is intercepted within the area enclosed by the flexible filter layer, preventing grout leakage. After the grout solidifies, it forms a core column. The supporting frame acts as the core column's stirrups, providing strong circumferential restraint and achieving seismic resistance. In summary, upgrading the monoreinforced core column to a radially self-expanding stirrup-constrained core column without changing the block mold has played a significant role in preventing grout leakage, enhancing seismic resistance, and providing construction error tolerance. Attached Figure Description

[0018] Figure 1 This is a front view of the self-expanding micro-permeable flexible mold shell assembly provided in an embodiment of the present invention; Figure 2 A top view of the self-expanding micro-permeable flexible mold shell assembly provided in an embodiment of the present invention; Figure 3 This is a partial structural schematic diagram of a rammed earth block wall provided in an embodiment of the present invention; Figure 4 A flowchart illustrating the construction method of a rammed earth block wall provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a front view of the self-expanding micro-permeable flexible mold shell assembly provided in an embodiment of the present invention. Figure 2 This is a top view of the self-expanding micro-permeable flexible mold shell assembly provided in an embodiment of the present invention. The following is in conjunction with... Figure 1 and Figure 2 The technical solution of the present invention will be described with reference to specific embodiments.

[0022] like Figure 1 As shown in the figure, the self-expanding micro-permeable flexible mold shell assembly provided by the embodiment of the present invention may specifically include: a central positioning ring 1, a radial self-expanding skeleton 2, and a flexible filter layer 3.

[0023] The central positioning ring 1 serves as the connection mechanism between the self-expanding micro-permeable flexible mold assembly and the vertical reinforcing bar 100. The inner diameter of the central positioning ring 1 matches the diameter of the vertical reinforcing bar 100, ensuring that within the wall, the central positioning ring 1 and the vertical reinforcing bar 100 are coaxial and slidably connected. The central positioning ring 1 can be made of materials such as carbon steel or alloy steel. In a specific example, the number of central positioning rings 1 is at least two.

[0024] The radially self-expanding skeleton 2 is an elastic mechanism of the self-expanding micropermeable flexible mold shell assembly, used to transform the radially compressed, retracted state of the self-expanding micropermeable flexible mold shell assembly into a radially expanded working state. Specifically, the radially self-expanding skeleton 2 can be disposed on the outer periphery of the central positioning ring 1.

[0025] Specifically, the radially self-expanding frame 2 may include a support frame 21 and radially flexible spokes 22. The outer diameter of the support frame 21 matches the diameter of the pre-drilled holes in the rammed earth block, allowing the self-expanding micro-permeable flexible mold assembly to adhere to the inner wall of the holes after expansion. The support frame 21 is preferably a spiral structure. The support frame 21 can be made of any of spring steel wire, nylon, or polycarbonate. One end of the radially flexible spokes 22 is connected to the support frame 21, and the other end is connected to the central positioning ring 1. The radially flexible spokes 22 can be made of steel wire.

[0026] The flexible filter layer 3 is the outer shell of the self-expanding micro-permeable flexible mold shell assembly. It wraps around the outside of the support frame 21 and is attached to the inner wall of the pre-reserved holes in the rammed earth block. The connection between the flexible filter layer 3 and the support frame 21 can be achieved by interlacing weaving, hot melt adhesive bonding, snap fastening, sewing, etc. The flexible filter layer 3 can be made of either alkali-resistant fiberglass mesh or non-woven fabric.

[0027] The flexible filter layer 3 has micropores for the fluid portion of the slurry to seep out, while the solid aggregate is filtered. In a specific example, the pore size is 0.1 mm to 0.5 mm.

[0028] The above describes the composition of a self-expanding micro-permeable flexible mold shell assembly and the connection relationships between its components. The following section will combine... Figure 3 This section provides a brief introduction to the working principle of this self-expanding micro-permeable flexible mold shell assembly.

[0029] When the self-expanding micro-permeable flexible mold assembly is in a non-working state, the support frame 21 is compressed and tightened radially, and the flexible filter layer 3 is wrapped around the outside of the support frame 21. When the self-expanding micro-permeable flexible mold assembly is in a working state, the central positioning ring 1 passes through the top of the vertical steel bar 100 in the hole of the rammed earth block, so that the self-expanding micro-permeable flexible mold assembly moves downward along the vertical steel bar 100 to the preset position. In this way, the central positioning ring 1 is coaxial with the vertical steel bar 100 and plays a limiting and supporting role for the vertical steel bar 100, preventing the vertical steel bar 100 from falling and sticking to the hole wall. Then the support frame 21 expands radially and opens the flexible filter layer 3, so that the flexible filter layer 3 is attached to the hole wall where the vertical steel bar 100 is located. The central positioning ring 1 is tied by the radial flexible spokes 22, forcibly fixing the vertical steel bar 100 at the geometric center of the hole. When grout is poured into the holes, some of the liquid in the grout permeates through the micropores of the flexible filter layer 3 and forms a bonding interface with the raw soil blocks, while the solid aggregate in the grout is intercepted in the area enclosed by the flexible filter layer 3, preventing grout leakage. After the grout solidifies, it forms a core column, and the supporting frame 21 forms the stirrups of the core column, providing strong circumferential restraint and achieving an earthquake-resistant effect.

[0030] This invention provides a self-expanding micro-permeable flexible formwork assembly. Through the central positioning ring, the vertical reinforcing bars are coaxially positioned within the burlap block's opening, ensuring the concrete protects the bars and solving the problem of fixing single reinforcing bars. This eliminates the need for manual reinforcement cage binding and reduces the construction difficulty of small-diameter core columns. The supporting frame allows the self-expanding micro-permeable flexible formwork assembly to expand radially within the opening, opening the outer flexible filter layer and ensuring it adheres tightly to the opening wall. The central positioning ring is connected by radial flexible spokes, forcibly fixing the vertical reinforcing bars to the geometric center of the opening. When grout is injected into the opening, some of the liquid in the grout permeates through the micropores of the flexible filter layer, forming a bonding interface with the burlap block. Solid aggregate in the grout is intercepted within the area enclosed by the flexible filter layer, preventing grout leakage. After the grout solidifies, it forms a core column. The supporting frame acts as the core column's stirrups, providing strong circumferential restraint and achieving seismic resistance. In summary, upgrading the monoreinforced core column to a radially self-expanding stirrup-constrained core column without changing the block mold has played a significant role in preventing grout leakage, enhancing seismic resistance, and providing construction error tolerance.

[0031] This invention also provides a type of earthen block wall, such as... Figure 3 As shown, the rammed earth block wall includes the self-expanding micro-permeable flexible formwork assembly described above, vertical reinforcement bars, and a certain number of rammed earth blocks. The rammed earth blocks have vertical openings, and the blocks are arranged vertically to form vertical channels. The vertical reinforcement bars are inserted into these channels. The self-expanding micro-permeable flexible formwork assembly is fitted over the outside of the vertical reinforcement bars.

[0032] This invention also provides a construction method for a rammed earth block wall as described above, specifically including: Figure 4 The steps shown are as follows: Step 110: Install vertical reinforcing bars on the top surface of the ground beam at preset intervals; Step 120: Construct a rammed earth block wall, so that the vertical holes of the upper and lower rammed earth blocks form a continuous vertical channel, and vertical steel bars are inserted into the vertical channel; Specifically, the vertical channel, also known as the grouting channel, facilitates the fixing and protection of the vertical reinforcing bars.

[0033] Step 130: Insert the self-expanding micro-permeable flexible mold shell assembly from the top of the vertical steel bar and lower it to the target position inside the vertical channel; Specifically, before grouting, the self-expanding micro-permeable flexible mold shell assembly is in a pre-compressed storage state.

[0034] Step 140: Release the self-expanding micro-permeable flexible mold shell assembly, causing the self-expanding micro-permeable flexible mold shell assembly to expand radially and change to the working state. The outer wall of the self-expanding micro-permeable flexible mold shell assembly is attached to the inner wall of the vertical channel, and the vertical steel bar is fixed to the geometric center of the vertical channel through the central positioning ring of the self-expanding micro-permeable flexible mold shell assembly. Specifically, the support frame of the self-expanding micro-permeable flexible mold shell component releases elastic potential energy, radially expanding the flexible filter layer so that it fits tightly against the inner wall of the hole. At this time, the central positioning ring is tied together by radial flexible spokes, forcibly fixing the vertical steel bar at the geometric center of the vertical channel.

[0035] Step 150: Grout is injected into the vertical channel to form core column concrete; wherein, under the injection pressure, the fluid components of the grout partially seep out of the flexible filter layer of the self-expanding micro-permeable flexible mold shell assembly to form a micro-permeable mechanical bonding interface, and the solid aggregate is constrained inside the flexible filter layer. After the grout solidifies, the self-expanding micro-permeable flexible mold shell assembly forms the stirrups of the core column.

[0036] Specifically, the grout is one or both of self-compacting fine aggregate concrete and cement-based mortar. The fluid permeating through the flexible filter layer, while containing no coarse aggregate, is rich in cementitious materials. It seeps into the surface layer along the capillary pores and micro-cracks of the inner wall of the raw earth blocks. The surface of the raw earth is usually covered with dust. The permeating fluid can encapsulate and solidify this dust, transforming the originally loose contact surface into a dense, composite transitional bonding layer. Moderate permeation can improve the bonding strength of the interface, resulting in better overall integrity of the wall under seismic loads and making it less prone to collapse.

[0037] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. 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 self-expanding micro-permeable flexible mold shell assembly, characterized in that, The self-expanding micro-permeable flexible mold shell assembly includes: a central positioning ring, a radially self-expanding skeleton, and a flexible filter layer; The inner diameter of the central positioning ring matches the diameter of the vertical reinforcing bar, so that the central positioning ring and the vertical reinforcing bar are coaxial and slidably connected. The radially self-expanding skeleton is disposed on the outer periphery of the central positioning ring, and is used to transform the radially compressed, retracted state of the self-expanding micro-permeable flexible mold shell assembly into a radially expanded working state. The radially self-expanding skeleton includes a support skeleton and radially flexible spokes. The outer diameter of the support skeleton matches the diameter of the pre-reserved holes in the rammed earth block, so that the self-expanding micro-permeable flexible mold shell assembly can be attached to the inner wall of the holes after expansion. One end of the radially flexible spokes is connected to the support skeleton, and the other end is connected to the central positioning ring. The flexible filter layer is wrapped around the outside of the support frame and attached to the inner wall of the pre-reserved holes in the raw soil block. It has micropores for the fluid portion of the slurry to seep out and the solid aggregate to be filtered.

2. The self-expanding micro-permeable flexible mold shell assembly according to claim 1, characterized in that, The supporting frame has a spiral structure.

3. The self-expanding micro-permeable flexible mold shell assembly according to claim 1, characterized in that, The supporting frame is made of any one of spring steel wire, nylon, or polycarbonate.

4. The self-expanding micro-permeable flexible mold shell assembly according to claim 1, characterized in that, The radial flexible spokes are made of steel wire.

5. The self-expanding micro-permeable flexible mold shell assembly according to claim 1, characterized in that, The pore size of the micropores is 0.1mm-0.5mm.

6. The self-expanding micro-permeable flexible mold shell assembly according to claim 1, characterized in that, The flexible filter layer is made of either alkali-resistant fiberglass mesh or non-woven fabric.

7. The self-expanding micro-permeable flexible mold shell assembly according to claim 1, characterized in that, The connection between the flexible filter layer and the supporting frame is achieved by methods such as interlacing weaving, hot melt adhesive bonding, snap fastening, and sewing.

8. A type of rammed earth block wall, characterized in that, The rammed earth block wall includes the self-expanding micro-permeable flexible mold shell assembly as described in any one of claims 1-7, vertical steel bars, and a certain number of rammed earth blocks; The raw earth blocks have vertical holes, and the raw earth blocks are arranged vertically so that the vertical holes form vertical channels; The vertical reinforcing bars are inserted into the vertical channel; The self-expanding micro-permeable flexible mold shell assembly is sleeved on the outside of the vertical reinforcing bars.

9. A construction method for a rammed earth block wall as described in claim 8, characterized in that, The construction method includes: Vertical reinforcing bars are installed on the top surface of the ground beam at preset intervals; The earthen block wall is constructed so that the vertical holes of the upper and lower earthen blocks form a continuous vertical channel, and the vertical steel bars are inserted into the vertical channel; The self-expanding micro-permeable flexible mold shell assembly is inserted from the top of the vertical steel bar and lowered into the vertical channel; Release the self-expanding micro-permeable flexible mold shell assembly, causing the self-expanding micro-permeable flexible mold shell assembly to expand radially and change to a working state. The outer wall of the self-expanding micro-permeable flexible mold shell assembly is pressed against the inner wall of the vertical channel, while the vertical steel bar is fixed to the geometric center of the vertical channel through the central positioning ring of the self-expanding micro-permeable flexible mold shell assembly. Grout is injected into the vertical channel to form core column concrete; wherein, under injection pressure, the fluid components of the grout partially seep out of the flexible filter layer of the self-expanding micro-permeable flexible mold shell assembly to form a micro-permeable mechanical bonding interface, and the solid aggregate is constrained inside the flexible filter layer. After the grout solidifies, the self-expanding micro-permeable flexible mold shell assembly forms the stirrups of the core column.

10. The construction method according to claim 9, characterized in that, The slurry is one or both of self-compacting fine aggregate concrete or cement-based mortar.

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