Buried spiral reinforced rigid winding pipe with composite structure wall

Abstract

The utility model provides a composite structure wall spiral reinforced rigid winding pipe which comprises a lining layer, a reinforcing layer and a fiber strip column layer from inside to outside, the lining layer, the reinforcing layer and the fiber strip column layer are fixedly adhered into a whole, the fiber strip column layer is formed by spirally and radially winding a first fiber strip column on the outer side of the reinforcing layer and fastening the first fiber strip column, the spiral pitch of the first fiber strip column is 50mm-100mm, and the spiral pitch of the second fiber strip column is 50mm-100mm. The included angle between the inner lining layer and the axis of the reinforcing layer is 55-57 degrees, and the ratio of the diameter of the inner lining layer to the diameter of the inner lining layer is 1: 70-1: 40; according to the composite structure pipe, the fiber strip column layer is arranged, so that the manufacturing cost is reduced under the condition that the composite structure pipe has good pressure resistance, and good economic benefits are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of water supply and drainage pipelines, and in particular relates to a spirally reinforced rigid winding pipe with a composite structure wall for underground use. Background Art

[0002] The existing water supply and drainage and long-distance water pipeline construction projects mainly use FRP (process) pipes and FRP sand-filled pipes. FRP (process) pipes have the advantages of high ring stiffness and long service life, but because they are made of glass fiber and resin without fillers of other materials, the unit price of the product is relatively high. FRP sand-filled pipes reduce the material usage of glass fiber and resin by increasing the sand-filled layer, thereby reducing the manufacturing cost of the pipe. However, when the internal water pressure increases significantly or is impacted by external forces, the sand-filled layer is prone to rupture, resulting in water leakage or overall structural collapse. Therefore, how to combine the high ring stiffness, long life and low cost characteristics of FRP sand-filled pipes into a FRP pipe has become an urgent need in the water supply and drainage pipeline market.

[0003] The utility model patent with the Chinese patent publication number CN103791174A discloses a composite winding thermoplastic FRP pipe and its preparation method. The pipe is composed of an inner layer, an intermediate layer and an outer layer, wherein the inner layer is a circumferentially wound continuous glass fiber reinforced thermoplastic prepreg tape layer, the intermediate layer is a spirally wound continuous glass fiber reinforced thermoplastic prepreg tape layer, and the outer layer is a circumferentially wound continuous glass fiber reinforced thermoplastic resin prepreg tape layer. Compared with the performance of existing FRP pipes, the pipe improves the technical performance of the circumferential tensile strength and axial tensile strength of the pipe through a multi-layer winding design, and reduces the manufacturing cost. To a certain extent, the market competitiveness of FRP pipes has been improved; however, the inner layer, the intermediate layer and the outer layer of the main structure of the pipe have different winding methods, and the ring stiffness is increased by stacking the winding, but the three layers are independently arranged and not reinforced, resulting in the pipe radial compression ring stiffness and radial tensile ring stiffness are not ideal, and the outer layer is wound by full coverage stacking of the winding layer, and the material cost needs to be reduced. In view of the technical problems that still exist in the multi-layer wrapped fiberglass pipe and the demand for reducing product manufacturing costs, it is urgent to develop a new type of wrapped pipe. To this end, after years of research and development by our company's R&D department, this utility model came into being. Utility Model Content

[0004] The utility model aims to provide a composite structure wall spirally reinforced rigid winding pipe for underground use, which greatly improves the radial compression resistance and tensile ring stiffness of the pipe and reduces the product cost through optimizing the pipe structure design on the basis of the excellent performance of the existing winding pipe.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A composite structure wall spiral reinforced rigid winding pipe for underground use, which is a composite structure, comprising an inner lining layer, a reinforcement layer and a fiber column layer bonded from the inside to the outside, wherein the fiber column layer is formed by spirally radially winding a first fiber column on the outside of the reinforcement layer and fastening it, wherein the spiral pitch of the first fiber column is 50mm-100mm, the ratio of the first fiber column diameter to the inner lining layer diameter is 1:70-1:40, and the angle between the first fiber column and the reinforcement layer axis is 55°-57°. The first fiber column comprises an inner core and a glass fiber binding tape wound outside the inner core, wherein the inner core is formed by mixing and curing glass fiber or basalt fiber with resin, wherein the resin is epoxy resin or orthophthalic unsaturated resin.

[0007] Compared with the prior art, the beneficial effect of the utility model is that the pipe achieves a balance between the annular stiffness of the pipe and the production cost of the product by optimizing the constituent materials of the fiber column layer, and arranging the fiber column layer according to the optimal spiral radial winding pitch and the fiber column layer and the inner lining layer in proportion, thereby comprehensively improving the annular tensile strength, axial tensile strength, radial compressive resistance and tensile ring stiffness of the pipe, and reducing the product manufacturing cost.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows:

[0009] Furthermore, the above-mentioned underground composite structure wall spirally reinforced rigid winding pipe has at least two groups of slots axially penetrating the reinforcement layer on the reinforcement layer, and a second fiber column is axially inserted in the slot, and the second fiber column is inserted into the slot before the first fiber column is wound around the reinforcement layer, and the first fiber column is spirally radially wound on the reinforcement layer to synchronously form a limit for the second fiber column, and the free end of the second fiber column is reversely wound with each pitch pitch of the first fiber column until the two free ends of the second fiber column are connected.

[0010] Furthermore, the above-mentioned underground composite structure wall spirally reinforced rigid winding pipe is provided with reinforcing ribs at the axial winding position of the first fiber column and the second fiber column.

[0011] Furthermore, the above-mentioned underground composite structure wall spirally reinforced rigid winding pipe is provided with a limiting ring in the slot, the inner wall of the limiting ring is coated with an adhesive layer, and the outer wall of the limiting ring is provided with a protrusion and a locking groove; the inner wall of the limiting ring is adhered to the slot, the second fiber column is passed through the limiting ring, and the limiting ring covers the second fiber column and is locked by the protrusion and the groove.

[0012] Furthermore, the above-mentioned underground composite structure wall spirally reinforced rigid winding pipe is also provided with ratchet mechanisms at both ends of the slot, and the free end of the second fiber column is connected to the swing wheel of the ratchet mechanism.

[0013] Compared with the prior art, the beneficial effect of the utility model is that, through the limiting and reinforcing setting of the second fiber column on the first fiber column, the spiral structure of the fiber column layer is further tightened, and the compression resistance and stability of the spirally reinforced rigid winding pipe of the composite structure wall are increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an axonometric view of Embodiment 1 of the present utility model;

[0015] Figure 2 This is an assembly diagram of the lining layer and the reinforcement layer of Examples 2 to 4 of the utility model;

[0016] Figure 3 It is an axonometric view of Embodiment 2 to Embodiment 4 of the present utility model;

[0017] Figure 4 It is the front view of Example 2 to Example 4 of the utility model;

[0018] Figure 5 It is a left view of Embodiment 2 to Embodiment 4 of the present utility model;

[0019] Figure 6 for Figure 5 AA section view;

[0020] Figure 7 It is a stereoscopic diagram of the limiting ring of embodiment 4 of the utility model.

[0021] The figure marks in the drawings of the specification include: lining layer 1, reinforcement layer 2, fiber column layer 3, first fiber column 31, second fiber column 32, slot 4, limiting ring 5, protrusion 6, slot 7, reinforcing rib 8, ratchet mechanism 9. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the following will further describe the implementation of the utility model in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] Example 1

[0024] like Figure 1As shown, the underground composite structure wall spiral reinforced rigid winding pipe is a composite structure, which includes an inner lining layer 1, a reinforcement layer 2 and a fiber column layer 3 from the inside to the outside, and each layer is bonded together. The inner lining layer 1 is formed by mixing resin and short fibers and then curing at high temperature. The reinforcement layer 2 is formed by one or more layers of long fibers impregnated with resin and uniformly wound around the surface of the inner lining layer 1. The uniform winding of the long fibers impregnated with resin can ensure the uniformity, sealing and mechanical strength of the reinforcement layer 2, thereby providing the necessary structural strength and pressure resistance for the pipe. The fiber column layer 3 is formed by the first fiber column 31 spirally radially wound on the outside of the reinforcement layer 2 and tightened. The first fiber column 31 includes an inner core and a glass fiber binding tape wound outside the inner core. The inner core is formed by mixing and curing glass fiber or basalt fiber with resin. The resin is epoxy resin or orthophthalic unsaturated resin. The spiral pitch of the first fiber column 31 is 50 mm-100 mm, the angle between the first fiber column 31 and the axis of the reinforcing layer 2 is 55°-57°, and the ratio of the diameter of the first fiber column 31 to the diameter of the inner lining layer 1 is 1:70-1:40.

[0025] Our R&D department conducted multiple sets of pressure tests and control tests on the final product of the underground composite structure wall spiral reinforced rigid winding pipe to detect the product performance of the new product.

[0026] Test purpose 1: 1. To verify the ring stiffness of the underground composite structure wall spiral reinforced rigid winding pipe with different winding pitches under predetermined conditions; the test samples are 10 pipe products with a length of 300mm, an inner diameter of DN1005, a lining layer thickness of 3mm, a reinforcement layer thickness of 15mm, a fiber column layer of 20mm, and a winding pitch of 20-120mm.

[0027] Test purpose 2: Verify the ring stiffness of the underground composite structure wall spiral reinforced rigid winding pipe under different proportions of fiber column and lining layer. The test sample is a pipe with a length of 300mm, an inner diameter of DN1005, a lining layer thickness of 3mm, a reinforcement layer thickness of 15mm, a fiber column layer winding pitch of 80mm, and a ratio of fiber column layer diameter to lining layer diameter of 1:100-1:20. Test equipment and conditions: Ring stiffness test machine, which can provide accurate pressure and measure deformation. The temperature is controlled at 25℃. During the test phase, the sample is placed horizontally on the test machine.

[0028] Test method: Place the test sample on the support device of the ring stiffness tester, ensure that the longitudinal axis of the test sample is vertical, and the compression plate of the tester is in uniform contact with the upper surface of the sample to avoid tilting or offset. According to ASTM D2412 standard, gradually apply pressure to the sample until the force value of 6.35kN is reached. During the force application process, continuously record the radial deformation of the sample. When the pressure reaches 6.35kN, record the total deformation at this time. Release the pressure and observe whether the sample has permanent deformation.

[0029] Experimental Group 1:

[0030] Helical pitch(mm) Applied load (kN) <![CDATA[Ring stiffness (N / m 2 )]]> Barcol Hardness Tensile strength(kN / m) Deformation rate (%) 20 6.35 13298.32 55.21 7601 6.96 30 6.35 13286.57 54.59 7599 6.96 40 6.35 13283.64 54.27 7596 6.97 50 6.35 13279.97 54.13 7590 6.97 60 6.35 13275.31 54.09 7585 7.03 70 6.35 13272.92 53.97 7584 7.04 80 6.35 13271.75 53.82 7581 7.04 90 6.35 13269.37 53.74 7572 7.06 100 6.35 13264.63 53.43 7570 7.10 110 6.35 13215.29 52.76 7326 7.21 120 6.35 13167.35 52.03 7191 7.42

[0031] The data of experimental group 1 show that when the pressure applied to the test specimen reaches 6.35 kN, when the fiber strip layer is radially spirally wound on the reinforcement layer with a pitch of 20-100 mm, the ring stiffness of the test specimen changes by 65 N / m. 2 Within, when the pitch of the fiber column layer radially wound on the reinforcement layer is more than 100mm, the pressure test detects that the ring stiffness of the pipe test sample is greatly reduced. Therefore, the radial winding pitch of the fiber column layer is preferably 20-100mm. As the spiral pitch of the fiber column layer shortens, the fiber column material used for winding will increase exponentially. However, the pressure test data show that the ring stiffness of the wound FRP pipe product with a spiral pitch of less than 50mm is only slightly increased. Therefore, when taking into account both the product ring stiffness and the leveling cost, when the spiral pitch is 50mm-100mm, the ring stiffness, Barcol hardness, tensile strength and deformation rate are not much different from the sample performance when the spiral pitch is 20mm-40mm, and are significantly better than the sample performance with a spiral pitch greater than 100mm. Therefore, the optimal solution is to use spiral radial winding of fiber columns with a pitch of 50-100mm.

[0032] Experimental Group 2:

[0033]

[0034]

[0035] It can be seen from the data of experimental group 2 that when the pressure applied to the test sample reaches 6.35kN, when the ratio of the fiber column layer diameter to the inner lining layer diameter is 1:70-1:20, the ring stiffness of the test sample of test group 2 changes by 100N / m 2Within, comprehensive fiber column layer raw material cost and ring stiffness test data; when the ratio of fiber column layer diameter to inner lining layer diameter is less than 1:70, for example, when the test 2 data group is 1:100-1:70, due to the lower diameter of the fiber column layer compared to the inner lining layer, the ring stiffness is greatly reduced, and the requirements of radial ring stiffness and tensile strength of the pipe cannot be met. In summary, when the ratio of fiber column layer diameter to inner lining layer diameter is greater than 1:40, the pipe ring stiffness increases slowly and slightly, and when the ratio of fiber column layer diameter to inner lining layer diameter is less than 1:70, the pipe ring stiffness is greatly reduced. Therefore, the preferred solution is that the ratio of fiber column layer diameter to inner lining layer diameter is 1:70-1:40, at which time a balance is achieved between pipe ring stiffness and cost. At this time, the ring stiffness, Barcol hardness, tensile strength and deformation rate of the pipe are not much different from the performance of the sample when the diameter ratio of the fiber column to the inner liner is greater than 1:40, and are significantly better than the performance of the sample when the diameter ratio of the fiber column to the inner liner is greater than 1:70.

[0036] The fiber columns on the fiber column layer are not mixed with any fillers except long fibers and resin. Combined with epoxy resin or orthophthalic unsaturated resin, they have low shrinkage performance and therefore have good pressure-bearing effect. By adopting the structure of the fiber column layer 3, the pressure and bending resistance of the pipeline can be enhanced, and the safety of the transportation system can be improved. In addition, by spirally winding the fiber columns and controlling the spiral pitch, the material of the fiber columns can be saved, thereby achieving better pressure resistance and corrosion resistance and reducing the project cost.

[0037] In view of the ring stiffness performance of the above-mentioned buried composite structure wall spiral reinforced rigid winding pipe, a conventional composite winding glass fiber reinforced plastic pipe was used to conduct a pressure test comparison with the composite structure wall spiral reinforced rigid winding pipe, wherein the composite structure wall spiral reinforced rigid winding pipe adopts a first fiber column spiral pitch of 50mm-100mm, and the ratio of the first fiber column 31 diameter to the inner lining layer 1 diameter is 1:70-1:40. The pipes of test group 1 and test group 2 specifically selected the data of the fiber column layer spiral pitch of 80mm and the ratio of the fiber column diameter to the inner lining layer diameter of 1:70; the conventional composite winding glass fiber reinforced plastic pipe of 300mm, the inner diameter of the pipe DN1005, the inner lining layer thickness of 3mm, the middle layer thickness of 15mm, and the outer layer thickness of 20mm were intercepted, and a pressure test control test was performed under an external force load of 6.35KN, as shown in the following table, and the test data are as follows:

[0038] Control group 1:

[0039]

[0040] Through the data analysis of the control group 1, it can be concluded that under a load of 6.35KN, the ring stiffness of the underground composite structure wall spirally reinforced rigid winding pipe is increased by more than 5% compared with the common three-layer conventional winding pipe on the market. The Barcol hardness, tensile strength and deformation rate are also improved to a certain extent. The product performance has a breakthrough improvement and has strong performance in use.

[0041] Example 2

[0042] like Figure 2-Figure 6 As shown, the difference between this embodiment and embodiment 1 is that at least two groups of slots 4 axially penetrating the reinforcing layer 2 are provided on the reinforcing layer 2 (the accompanying drawing shows 4 groups), and a second fiber column 32 is axially inserted in the slot 4. The second fiber column 32 is inserted into the slot 4 before the first fiber column 31 is wound around the reinforcing layer 2. The first fiber column 31 is spirally radially wound around the reinforcing layer 2 and simultaneously forms a limit for the second fiber column 32. The free end of the second fiber column 32 is reversely wound around each pitch of the first fiber column 31 until the two free ends of the second fiber column 32 are connected. Ratchet mechanisms 9 are also provided at both ends of the slot 4, and the free end of the second fiber column 32 is connected to the balance wheel of the ratchet mechanism 9. The purpose of tightening the second fiber column 32 is achieved by rotating the ratchet mechanism 9.

[0043] The R&D department tested the annular stiffness of the underground composite structure wall spiral reinforced rigid winding pipe, and arranged a second fiber column in the groove and therein according to the ring stiffness performance of the pipe scheme in Example 2, in which the spiral pitch of the first fiber column is radially wound in the opposite direction of the first fiber column. The control group 1 was used, in which the spiral pitch of the first fiber column of the composite structure wall spiral reinforced rigid winding pipe was 50mm-100mm, and the ratio of the diameter of the first fiber column 31 to the diameter of the inner lining layer 1 was 1:70-1:40. Specifically, the data with a spiral pitch of 80mm for the fiber column layer and a ratio of the fiber column diameter to the inner lining layer diameter of 1:70 were selected as the basic comparison; the composite structure wall spiral reinforced rigid winding pipe of Example 2 was cut into 300mm, the inner diameter of the pipe was DN1005, the inner lining layer was 3mm thick, the middle layer was 15mm thick, and the outer layer was 20mm thick, and a pressure test control test was performed under an external force load of 6.35KN.

[0044] Test method: Place the test sample on the support device of the ring stiffness tester, ensure that the longitudinal axis of the test sample is vertical, and the compression plate of the tester is in uniform contact with the upper surface of the sample to avoid tilting or offset. According to ASTM D2412 standard, gradually apply pressure to the sample until the force value of 6.35kN is reached. During the force application process, continuously record the radial deformation of the sample. When the pressure reaches 6.35kN, record the total deformation at this time. Release the pressure and observe whether the sample has permanent deformation.

[0045] As shown in the following table, the test data are as follows:

[0046] Control group 2:

[0047] Pipe material solution Applied load (kN) <![CDATA[Ring stiffness (N / m 2 )]]> Barcol Hardness Tensile strength(kN / m) Deformation rate (%) Example 1 6.35 13271.75 53.82 7581 7.04 Example 2 6.35 13683.54 54.78 7743 6.20

[0048] Through the data analysis of the control group 2, it can be concluded that under a load of 6.35KN, the ring stiffness of the spiral reinforced rigid winding pipe with composite structure wall buried in Example 2 is increased by more than 3% again compared with the pipe in Example 1, the Barcol hardness and tensile strength are improved to a certain extent, and the deformation rate is reduced to a certain extent. Specifically: the radial ring stiffness of the spiral reinforced rigid winding pipe with composite structure wall buried in Example 2 is increased by more than 8% compared with the conventional three-layer winding pipe, the Barcol hardness and tensile strength are increased by more than 3%, and the deformation rate is reduced by more than 20%. In summary, the performance of the spiral reinforced rigid winding pipe with composite structure wall buried in Example 2 is better than that of the pipe in the example, and has a breakthrough improvement in product performance compared with the conventional three-layer winding glass jar, and has strong performance in use. The provision of slots and second fiber bars enables the performance of the spiral reinforced rigid winding pipe with composite structure wall buried in the ground to be unexpectedly improved, with outstanding use effects and significant progress. By limiting the first fiber column 31 with the second fiber column 32, the spiral structure of the fiber column layer is further tightened, thereby increasing the compression resistance and stability of the spirally reinforced rigid winding pipe of the composite structure wall. In addition, the second fiber column layer 32 uses less material, which improves various performance indicators without substantially increasing the construction cost, thereby having good economic benefits and technical prospects.

[0049] Example 3

[0050] like Figure 4 As shown, the difference between this embodiment and embodiment 2 is that reinforcing ribs 8 are provided at the axial winding point of the first fiber column 31 and the second fiber column 32 to further tighten the spiral structure of the fiber column layer and increase the compression resistance and stability of the spirally reinforced rigid winding pipe of the composite structure wall.

[0051] Example 4

[0052] like Figure 2 , Figure 6 and Figure 7As shown, the difference between this embodiment and embodiment 2 is that a limiting ring 5 is further provided in the slot hole 4, the inner wall of the limiting ring 5 is coated with an adhesive layer, and the outer wall is provided with a protrusion 6 and a locking groove 7, the inner wall of the limiting ring 5 is adhered to the slot hole 4, the second fiber column 32 is passed through the limiting ring 5, the limiting ring 5 covers the second fiber column 32 and is locked by the protrusion 6 and the locking groove 7. A ratchet mechanism 9 is also provided at both ends of the slot hole 4, the free end of the second fiber column 32 is connected to the swing wheel of the ratchet mechanism 9, the ratchet mechanism 9 is rotated to tighten the second fiber column 32, and then the protrusion 6 and the locking groove 7 of the limiting ring 5 cover the second fiber column 32, which further limits the second fiber column 32, thereby further improving the pressure bearing capacity of the spiral reinforced rigid winding pipe of the composite structure wall.

[0053] The limiting ring 5 adheres to the slot 4, so that the limiting ring and the reinforcing layer are bonded together. After the second fiber column 32 is inserted into the slot 4, the second fiber column 32 is covered and locked by using the protrusion 6 and the slot 7 on the limiting ring, so that the second fiber column 32 and the reinforcing layer 2 are set as one. After the first fiber column 31 is repeatedly spirally wound around the reinforcing layer 2, the free end of the second fiber column 32 is repeatedly wound along the spiral pitch of the first fiber column 21, thereby forming the first fiber column 31, the second fiber column 32 and the reinforcing layer 2 are set as one. When the first fiber column 31 breaks under the action of external force, the second fiber column 32 plays a role in limiting the first fiber column 31, effectively preventing the cliff-like drop in the ring stiffness of the pipe, and reducing the engineering quality accident rate caused by product damage.

[0054] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A composite structure wall spirally reinforced rigid winding pipe for underground use, which is a composite structure, comprising an inner lining layer (1), a reinforcement layer (2) and a fiber column layer (3) bonded together from the inside to the outside; characterized in that: The fiber column layer (3) is formed by spirally radially winding a first fiber column (31) around the outside of a reinforcing layer (2) and fastening the first fiber column (31), wherein the spiral pitch of the first fiber column (31) is 50 mm-100 mm, and the ratio of the diameter of the first fiber column (31) to the diameter of the inner lining layer (1) is 1:70-1:

40. The first fiber column (31) comprises an inner core and a glass fiber binding tape wound around the inner core, wherein the inner core is formed by mixing and curing glass fiber or basalt fiber with a resin, and the resin is an epoxy resin or an orthophthalic unsaturated resin.

2. The underground composite structure wall spirally reinforced rigid winding pipe according to claim 1, characterized in that: The reinforcing layer (2) is provided with at least two groups of slots (4) axially penetrating the reinforcing layer (2), and a second fiber column (32) is axially inserted into the slots (4). The second fiber column (32) is inserted into the slots (4) before the first fiber column (31) is wound around the reinforcing layer (2). The first fiber column (31) is spirally and radially wound around the reinforcing layer (2) to simultaneously form a limit for the second fiber column (32). The free end of the second fiber column (32) is reversely wound with each pitch of the first fiber column (31) until the two free ends of the second fiber column (32) are connected.

3. The underground composite structure wall spirally reinforced rigid winding pipe according to claim 2, characterized in that: A reinforcing rib (8) is provided at the axial winding point between the first fiber column (31) and the second fiber column (32).

4. The underground composite structure wall spirally reinforced rigid winding pipe according to claim 3, characterized in that: A limiting ring (5) is also provided in the slot hole (4), the inner wall of the limiting ring (5) is coated with an adhesive layer, and the outer wall of the limiting ring (5) is provided with a protrusion (6) and a locking groove (7); the inner wall of the limiting ring (5) is adhered to the slot hole (4), the second fiber column (32) is passed through the limiting ring (5), and the limiting ring (5) covers the second fiber column (32) and is locked by the protrusion (6) and the locking groove (7).

5. The underground composite structure wall spirally reinforced rigid winding pipe according to claim 4, characterized in that: Ratchet mechanisms (9) are also provided at both ends of the slot hole (4), and the free end of the second fiber column (32) is connected to the balance wheel of the ratchet mechanism (9).

6. The underground composite structure wall spirally reinforced rigid winding pipe according to any one of claims 1 to 5, characterized in that: The angle between the first fiber column (31) and the axis of the reinforcement layer (2) is 55°-57°.

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