Tough connection underground drainage pipeline and construction method thereof

Abstract

The tough connection underground drainage pipeline comprises a pipeline body and a connection structure arranged at one end of the pipeline body, and the connection structure comprises a transition section with the inner diameter equal to that of the pipeline body and a connection section with the inner diameter slightly larger than the outer diameter of the pipeline body. An annular groove is formed in the connecting section, a grouting opening and an exhaust opening which communicate the groove with the outside are formed in the connecting section, and in addition, the invention further provides a construction method of the tough connection underground drainage pipeline. The pipeline body is gradually transited into the connecting section through the transition section, the stability of the connection structure is guaranteed, the connection structure can be conveniently connected with the pipeline body of the adjacent tough connection underground drainage pipeline through the connecting section, and the connection structure can adapt to settlement of a foundation with large deformation; and therefore, large-area serious disengagement of the pipeline foundation and pipeline damage caused by slight water seepage are avoided, and the durability of the tough connection underground drainage pipeline is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of municipal drainage pipes, and in particular relates to a toughly connected underground drainage pipe and a construction method thereof. Background Art

[0002] Concrete pipes are a common type of pipe for municipal drainage. They are generally made by splicing multiple prefabricated concrete pipe sections and are buried underground by excavating trenches. They are typical concealed projects. During the construction process, concrete pipes often encounter unfavorable geological conditions such as soft soil layers, collapsible loess, and miscellaneous fill soil. If the foundation is not properly treated, the pipeline is prone to settlement and uneven settlement after construction, causing dislocation and leakage at the connection of the pipe sections. If it is not discovered in time, rainwater leakage in the pipeline will cause the outside of the pipe to be emptied. As time goes by, it will cause the ground to crack and collapse, seriously threatening the safety and use of nearby buildings (structures). For this reason, when constructing underground pipelines in some areas with poor geological conditions, it is necessary to ensure that the connection structure of the concrete pipe has sufficient toughness and sealing performance.

[0003] The pipes are butted together through joint structures, and the gaps between adjacent sections are sealed with materials such as two-component polysulfide sealants. Existing sealing materials have poor tensile strength. When the relative settlement of the foundation soil under the pipe reaches about 1 cm, the sealing material will initially crack and leak water. If the pipeline is built on a collapsible loess site, the leaking water will further cause the foundation to collapse and unevenly settle, which will in turn cause further cracking and water leakage at the pipe joints, forming a vicious cycle. Therefore, there is an urgent need to develop a tough underground drainage pipe and its construction method to reduce the sensitivity of the drainage pipe connection structure to foundation settlement, improve the sealing and tensile crack resistance of the connection structure under settlement, and thus avoid water leakage and improve the durability of the project. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tough underground drainage pipe in view of the deficiencies of the above-mentioned prior art. The tough underground drainage pipe gradually transitions the pipe body to the connection section by setting a transition section, thereby ensuring the stability of the connection structure. The connection section is convenient for connecting with the pipe body of the adjacent tough underground drainage pipe. The connection structure can adapt to the large deformation of the foundation settlement, thereby avoiding the large-scale serious hollowing out of the pipe foundation and pipe damage caused by slight water seepage, thereby improving the durability of the tough underground drainage pipe.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a resiliently connected underground drainage pipe, characterized in that the resiliently connected underground drainage pipe includes a pipe body and a connecting structure arranged at one end of the pipe body, the connecting structure includes a transition section with an inner diameter the same as the inner diameter of the pipe body and a connecting section with an inner diameter slightly larger than the outer diameter of the pipe body, an annular groove is provided inside the connecting section, and a grouting port and an exhaust port are respectively provided on the connecting section to connect the groove with the outside.

[0006] The above-mentioned tough connection underground drainage pipe is characterized in that the connection structure and the pipe body are both composed of concrete and pipe steel bars inside the concrete, the pipe steel bars include inner longitudinal bars located on the inner side and outer longitudinal bars located on the outer side, the inner longitudinal bars and outer longitudinal bars are both equipped with multiple annular bars, and the connection structure and the pipe body use continuous inner longitudinal bars and outer longitudinal bars.

[0007] The above-mentioned ductile connection underground drainage pipe is characterized in that the inner diameter of the connecting section is 4 cm to 7 cm larger than the outer diameter of the pipe body.

[0008] The above-mentioned ductile connection of underground drainage pipe is characterized in that the inner diameter of the connecting section away from the transition section is larger than the inner diameter of the connecting section close to the transition section, and forms an inclination angle of 2° to 4°.

[0009] The above-mentioned tough connection underground drainage pipe is characterized in that the depth of the groove is 25% to 35% of the wall thickness of the connecting section, the width is 30% to 60% of the length of the inner wall of the connecting section, and the groove is located in the middle of the connecting section.

[0010] The above-mentioned toughly connected underground drainage pipe is characterized in that the angle between the grouting port and the exhaust port and the center of the cross-section of the pipe body is 120° to 150°, and the exhaust port faces upward, and the diameter of the grouting port is 3cm to 6cm.

[0011] The above-mentioned tough connection underground drainage pipe is characterized in that the pipe body and the connection structure are cast in two times, first casting the pipe body part, and within 2 hours before the casting of the pipe body is completed and the final setting is completed, the connection structure part is cast, and the casting is completed before the final setting of the cast pipe body is completed; before casting the connection structure, the interface between the pipe body and the connection structure is roughened.

[0012] The above-mentioned tough connection underground drainage pipe is characterized in that the connection structure is cast with high ductility concrete material, and the high ductility concrete material includes: cement, fly ash, quartz sand, water, water reducing agent, PE fiber or PVA fiber, and the high ductility concrete material is also added with admixtures, and the mix ratio meets the following conditions:

[0013] ① The water-binder ratio is 0.27-0.45;

[0014] ②The volume content of the fiber is 0.5% to 2%;

[0015] ③The mass dosage of water reducing agent is not less than 1%;

[0016] ④The sand-to-glue ratio is 0.3-0.45.

[0017] The above-mentioned tough connection underground drainage pipe is characterized in that the groove of the connection structure is injected with geopolymer material for sealing, and the geopolymer sealing material includes: coal gasification slag, fly ash, metakaolin, sodium silicate powder, sodium metaaluminosilicate powder, nano silicon dioxide, solid sodium hydroxide powder and water; the molecular molar numbers of SiO2, Al2O3, Na2O, NaOH and H2O in the geopolymer sealing material are recorded as p1, p2, p3, p4 and p5 respectively, and meet the following conditions:

[0018] ①0.8 <p1 / (p3+p1 / 2)<2.6;

[0019] ②3 <p1 / p2<5;

[0020] ③0.5<(p3+p4 / 2) / p2<1.5;

[0021] ④2 <p5 / (p3+p4 / 2)<3;

[0022] ⑤ The mass of the metakaolin is 5% to 30% of the total mass of the coal gasification slag, fly ash, metakaolin, sodium silicate powder, sodium metaaluminosilicate powder and nano-silicon dioxide.

[0023] In addition, the present invention also provides a construction method for ductilely connecting underground drainage pipes, characterized in that the method comprises the following steps:

[0024] Step 1: Measurement and layout: Use measuring instruments to measure and layout the pipeline centerline and inspection well;

[0025] Step 2: Trench excavation: Excavate the trench according to the measurement and layout in step 1, strictly control the trench excavation depth and slope, and clean up the earth and debris in the trench;

[0026] Step 3: Construction of pipeline foundation: According to the trench excavated in step 2 and the geological conditions, set up the foundation in the trench;

[0027] Step 4: Pipeline laying: Use a crane to lift the multiple sections of the resilient underground drainage pipeline into the trench where the foundation is set in step 3, and then install it to obtain the installed resilient underground drainage pipeline;

[0028] Step 5, filling the connection structure: using sesame oil to seal the gap between the connection section of the underground drainage pipe obtained in step 4 and the pipe body of the adjacent pipe;

[0029] Step 6, grouting: injecting geopolymer sealing material from the grouting port into the tough underground drainage pipe after plugging in step 5 until the sealing material is evenly discharged from the exhaust port to obtain a connected tough underground drainage pipe;

[0030] Step 7, inspection well construction: build or cast an inspection well in accordance with the design drawings and connect it to the underground drainage pipe with the connection toughness obtained in step 6;

[0031] Step 8: Water-tightness test: 5 hours after the injection of geopolymer sealing material in step 6 is completed, a water-tightness test is performed;

[0032] Step 9. Backfill the trench: After the closed water test in step 8 is passed, backfill the trench in time to complete the construction of the ductile connection underground drainage pipe.

[0033] In the present invention, a suitable foundation type, such as a sand foundation, a concrete foundation, etc., is selected according to the geological conditions and design requirements. The pipeline structure proposed by the present invention can appropriately reduce the standard requirements for the foundation. For example, some working conditions that require a concrete foundation can be replaced with a sand foundation after demonstration and confirmation to reduce costs.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. The present invention gradually transitions the pipeline body to the connecting section by setting a transition section to ensure the stability of the connecting structure. The connecting section is convenient for connection with the pipeline body of the adjacent tough connecting underground drainage pipeline. The connecting structure can adapt to the foundation settlement with large deformation, thereby avoiding large-scale serious hollowing out of the pipeline foundation and pipeline damage caused by slight water seepage, thereby improving the durability of the tough connecting underground drainage pipeline.

[0036] 2. The connection structure of the present invention adopts high-ductility concrete. Due to the ultra-high toughness and ductility of high-ductility concrete, it is not easy to cause brittle failure. It can allow the pipeline itself to undergo a certain settlement or deformation, reducing the requirements for the foundation at the bottom of the pipeline, thereby improving the durability of the pipeline connection structure.

[0037] 3. In the present invention, geopolymer sealing materials are introduced into the pipe joint structure for sealing and reinforcement. The provided formula can ensure that the material has a good sealing effect on the gap of the joint structure after solidification, has high strength, and can tightly connect two adjacent pipe sections together through chemical reaction, which is not easy to be damaged; at the same time, the geopolymer material has the characteristics of rapid setting, can quickly solidify, and shorten the construction period.

[0038] 4. In the present invention, the connecting structure and the pipeline body are connected by steel bars, which can effectively ensure the integrity of the pipeline structure; the groove is provided to provide necessary conditions for the filling and function of the geopolymer sealing material. The pipeline body adopts ordinary concrete and the connecting structure adopts high ductility concrete. The design comprehensively considers the performance and cost. At the same time, the corresponding construction method proposed is simple and feasible in operation and easy to implement.

[0039] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of the ductile connection underground drainage pipeline in the present invention.

[0041] Figure 2 It is a schematic diagram of the positional relationship between the grouting port and the exhaust port in the ductile connection underground drainage pipe in the present invention.

[0042] Figure 3 It is a schematic diagram of the assembly structure of two adjacent sections of ductilely connected underground drainage pipes in the present invention.

[0043] Figure 4 It is an enlarged view of the connection of the assembly structure of two adjacent sections of ductilely connected underground drainage pipes in the present invention.

[0044] Figure 5 It is a schematic diagram of two adjacent sections of ductilely connected underground drainage pipes after grouting at the groove of the connection structure after assembly in the present invention.

[0045] Description of reference numerals:

[0046] 1—connection structure; 1-1—transition section; 1-2—connection section;

[0047] 1-3—groove; 1-4—grouting port; 1-5—exhaust port;

[0048] 2—Pipeline body; 3—Inner longitudinal ribs; 4—Outer longitudinal ribs;

[0049] 5—annular rib; 6—geopolymer sealing material. DETAILED DESCRIPTION

[0050] A tough connection underground drainage pipe of the present invention is described in detail through Example 1.

[0051] Example 1

[0052] like Figure 1 to Figure 5As shown, a tough connecting underground drainage pipe in this embodiment includes a pipe body 2 and a connecting structure 1 arranged at one end of the pipe body 2, the connecting structure 1 includes a transition section 1-1 with an inner diameter the same as the inner diameter of the pipe body 2 and a connecting section 1-2 with an inner diameter slightly larger than the outer diameter of the pipe body 2, an annular groove 1-3 is provided inside the connecting section 1-2, and a grouting port 1-4 and an exhaust port 1-5 for connecting the groove 1-3 with the outside are respectively provided on the connecting section 1-2.

[0053] It should be noted that by setting the transition section 1-1, the pipe body 2 is gradually transitioned to the connecting section 1-2 to ensure the stability of the docking structure 1. By setting the connecting section 1-2, it is convenient to connect with the pipe body 2 of the adjacent tough connected underground drainage pipe. The docking structure 1 can adapt to the foundation settlement with large deformation, thereby avoiding large-scale serious hollowing out of the pipe foundation and pipe damage caused by slight water seepage, thereby improving the durability of the tough connected underground drainage pipe.

[0054] It should be noted that the provision of the annular grooves 1-3 facilitates the injection of geopolymer material for sealing, thereby further enhancing the connection effect.

[0055] like Figure 1 to Figure 5 As shown, in this embodiment, the connection structure 1 and the pipeline body 2 are both composed of concrete and pipeline reinforcement inside the concrete, and the pipeline reinforcement includes an inner longitudinal rib 3 located on the inside and an outer longitudinal rib 4 located on the outside, and the inner longitudinal rib 3 and the outer longitudinal rib 4 are both matched with a plurality of annular ribs 5, and the connection structure 1 and the pipeline body 2 use continuous inner longitudinal ribs 3 and outer longitudinal ribs 4. By providing the inner longitudinal ribs 3 and the outer longitudinal ribs 4 and matching the plurality of annular ribs 5, the structural strength of the tough connection underground drainage pipeline is enhanced, and by making the connection structure 1 and the pipeline body 2 use continuous inner longitudinal ribs 3 and outer longitudinal ribs 4, the connection strength of the connection structure 1 and the pipeline body 2 is guaranteed, thereby ensuring the connection effect of the connection structure 1.

[0056] In this embodiment, the inner diameter of the connection section 1-2 is 4 cm to 7 cm larger than the outer diameter of the pipe body 2. By controlling the inner diameter of the connection section 1-2 to be larger than the outer diameter of the pipe body 2, the pipe body 2 of the underground drainage pipe can be inserted into the adjacent connection structure 1 to facilitate the connection construction.

[0057] In this embodiment, the inner diameter of the connecting section 1-2 away from the transition section 1-1 is larger than the inner diameter of the connecting section 1-2 close to the transition section 1-1, and forms an inclination angle of 2° to 4°. By setting a certain inclination angle, it is easy to insert the pipe body 2 of the underground drainage pipe into the adjacent connecting structure 1, which is convenient for connection construction.

[0058] In this embodiment, the depth of the groove 1-3 is 25% to 35% of the wall thickness of the connecting section 1-2, and the width is 30% to 60% of the inner wall length of the connecting section 1-2. The groove 1-3 is located in the middle of the connecting section 1-2. By controlling the parameters of the groove 1-3, the connection stability between the connecting structure 1 and the adjacent pipe body 2 is ensured after the geopolymer material is injected.

[0059] In this embodiment, the angle between the grouting port 1-4 and the exhaust port 1-5 and the center of the cross section of the pipe body 2 is 120° to 150°, and the exhaust port 1-5 is upward, and the diameter of the grouting port 1-4 is 3cm to 6cm. By controlling the angle between the grouting port 1-4 and the exhaust port 1-5, and controlling the exhaust port 1-5 to be upward, the grouting port 1-4 is located at the lower side, which is convenient for subsequent grouting, and at the same time ensures that the groove 1-3 is filled, thereby improving the connection effect.

[0060] In this embodiment, the pipe body 2 and the connection structure 1 are cast in two times. The pipe body 2 is cast first. After the pipe body 2 is cast and within 2 hours before the final setting, the connection structure 1 is cast and the casting is completed before the final setting of the cast pipe body 2. Before casting the connection structure 1, the interface between the pipe body 2 and the connection structure 1 is roughened. Through two castings, the connection structure 1 and the pipe body 2 are made of different materials, which reduces the cost of the tough connection underground drainage pipe, while ensuring the connection effect of the pipe body 2 and the connection structure 1.

[0061] In this embodiment, the connection structure 1 is cast with high ductility concrete material, and the high ductility concrete material includes: cement, fly ash, quartz sand, water, water reducing agent, PE fiber or PVA fiber, and the mix ratio thereof satisfies the following conditions:

[0062] ① The water-binder ratio is 0.27-0.45;

[0063] ②The volume content of the fiber is 0.5% to 2%;

[0064] ③The mass dosage of water reducing agent is not less than 1%;

[0065] ④ The sand-binder ratio is 0.3-0.45. Both the water-binder ratio and the sand-binder ratio are mass ratios. The connection structure 1 is prepared by using high-ductility concrete materials. Due to the ultra-high toughness and ductility of high-ductility concrete, it is not easy to cause brittle failure, and the pipeline itself can be allowed to undergo a certain settlement or deformation, reducing the requirements for the foundation at the bottom of the pipeline, thereby improving the durability of the pipeline connection structure 1 and ensuring the connection effect of the connection structure 1.

[0066] It should be noted that the pipeline body 2 is made of ordinary concrete material.

[0067] In this embodiment, the grooves 1-3 of the connection structure 1 are sealed by injecting geopolymer material, and the geopolymer sealing material 6 includes: coal gasification slag, fly ash, metakaolin, sodium silicate powder, sodium aluminosilicate powder, nano silicon dioxide, solid sodium hydroxide powder and water; the molecular molar numbers of SiO2, Al2O3, Na2O, NaOH and H2O in the geopolymer sealing material 6 are recorded as p1, p2, p3, p4 and p5 respectively, and meet the following conditions:

[0068] ①0.8 <p1 / (p3+p4 / 2)<2.6;

[0069] ②3 <p1 / p2<5;

[0070] ③0.5<(p3+p4 / 2) / p2<1.5;

[0071] ④2 <p5 / (p3+p4 / 2)<3;

[0072] ⑤ The mass of metakaolin is 5% to 30% of the total mass of coal gasification slag, fly ash, metakaolin, sodium silicate powder, sodium metaaluminosilicate powder, and nano-silicon dioxide. By using geopolymer materials for sealing, it is ensured that the material has a good sealing effect on the gap of the docking structure 1 after solidification, and has high strength. The geopolymer material can connect two adjacent sections of the pipeline tightly and strengthen them through chemical reactions, and is not easy to be damaged. At the same time, the geopolymer material has the characteristics of rapid setting, which can quickly solidify and shorten the construction period.

[0073] The mass ratios of various elements of the various components of the geopolymer sealing material 6 in this embodiment are shown in Table 1;

[0074] Table 1

[0075]

[0076]

[0077] The relative molecular masses of SiO2, Al2O3, Na2O, NaOH, and H2O are recorded as y1, y2, y3, y4, and y5, respectively. The relative molar number of each element per unit mass of each component is calculated by the relative molecular mass, as shown in Table 2;

[0078] Table 2

[0079]

[0080] The mass fractions of coal gasification slag, fly ash, metakaolin, sodium silicate powder, sodium aluminosilicate powder, nano silicon dioxide, solid sodium hydroxide powder, and water are respectively recorded as Z1, Z2, Z3, Z4, Z5, Z6, Z7, and Z8. The molecular numbers of each molecular component are:

[0081]

[0082] Therefore, geopolymer materials should meet the following requirements:

[0083]

[0084] ⑤0.05 <Z3 / (Z1+Z2+Z3+Z4+Z5+Z6)<0.3;

[0085] A construction method for toughly connecting underground drainage pipes of the present invention is described in detail through Examples 2 to 4.

[0086] Example 2

[0087] This embodiment includes the following steps:

[0088] Step 1: Measurement and layout: Use measuring instruments to measure and layout the pipeline centerline and inspection well;

[0089] Step 2: Trench excavation: According to the measurement and layout in step 1, the trench is excavated mechanically, with manual assistance, and the trench excavation depth and slope are strictly controlled, and the earth and debris in the trench are cleaned;

[0090] Step 3: Construction of pipeline foundation: According to the trench excavated in step 2 and the geological conditions, a sand foundation is set in the trench;

[0091] Step 4: Pipeline laying: Use a crane to lift the multi-section resilient underground drainage pipeline into the trench where the foundation is set in step 3, and then install it with manual assistance to obtain the installed resilient underground drainage pipeline; when the resilient underground drainage pipeline is placed, it should be ensured that the exhaust port 1-5 faces upward, and the grouting port 1-4 is located at the lower side, so that grouting can be achieved on the side of the pipeline and exhaust at the top;

[0092] The length of the ductile underground drainage pipe is 3m, the inner diameter of the pipe body 2 is 1.2m, and the outer diameter is 1.44m. The inner diameter of the connecting section 1-2 of the connecting structure 1 away from the transition section 1-1 is 1.48m, which is larger than the inner diameter of the side close to the transition section 1-1, and forms an inclination angle of 2°. The depth of the groove 1-3 is 25% of the wall thickness of the connecting section 1-2, and the width is 30% of the length of the inner wall of the connecting section 1-2. The groove 1-3 is located in the middle of the connecting section 1-2;

[0093] The pipe body 2 of the tough connection underground drainage pipe is made of ordinary concrete material, and the connection structure 1 is composed of the components and proportions in Table 3;

[0094] Table 3

[0095]

[0096] Step 5: Filling the connection structure: Use sesame oil to seal the gap between the connection section 1-2 and the pipe body 2 of the adjacent pipe in the underground drainage pipe obtained in step 4 to ensure that the filling is dense;

[0097] Step 6, grouting: injecting the geopolymer sealing material 6 into the tough underground drainage pipe after plugging in step 5 from the grouting port 1-4 until the sealing material is evenly discharged from the exhaust port 1-5, thereby obtaining a connected tough underground drainage pipe;

[0098] The geopolymer sealing material 6 is composed of the components and parts shown in Table 4;

[0099] Table 4

[0100]

[0101] Step 7, inspection well construction: according to the design drawings, build or cast the inspection well that matches the connection toughness obtained in step 6 to connect the underground drainage pipe, and ensure that the size, elevation and verticality of the inspection well meet the requirements, and the surface of the well is flat and smooth;

[0102] Step 8: Water-tightness test: 5 hours after the injection of geopolymer sealing material 6 in step 6 is completed, a water-tightness test is performed to check the tightness of the pipeline and any leakage is promptly handled;

[0103] Step 9. Backfill the trench: After the closed water test in step 8 is passed, backfill the trench in time. Use soil that meets the requirements as the backfill material, compact it layer by layer, ensure the quality of backfill, and complete the construction of the ductile connection underground drainage pipeline.

[0104] After testing, it was found that the resiliently connected underground drainage pipe constructed in this embodiment allows the pipe itself to undergo a certain amount of settlement or deformation, thereby reducing the requirements for the foundation at the bottom of the pipe and improving the durability of the resiliently connected underground drainage pipe.

[0105] Example 3

[0106] This embodiment includes the following steps:

[0107] Step 1: Measurement and layout: Use measuring instruments to measure and layout the pipeline centerline and inspection well;

[0108] Step 2: Trench excavation: According to the measurement and layout in step 1, the trench is excavated mechanically, with manual assistance, and the trench excavation depth and slope are strictly controlled, and the earth and debris in the trench are cleaned;

[0109] Step 3: Construction of pipeline foundation: According to the trench excavated in step 2 and the geological conditions, a sand foundation is set in the trench;

[0110] Step 4: Pipeline laying: Use a crane to lift the multi-section resilient underground drainage pipeline into the trench where the foundation is set in step 3, and then install it with manual assistance to obtain the installed resilient underground drainage pipeline; when the resilient underground drainage pipeline is placed, it should be ensured that the exhaust port 1-5 faces upward, and the grouting port 1-4 is located at the lower side, so that grouting can be achieved on the side of the pipeline and exhaust at the top;

[0111] The length of the tough underground drainage pipe is 3m, the inner diameter of the pipe body 2 is 1.2m, and the outer diameter is 1.44m. The inner diameter of the connecting section 1-2 of the connecting structure 1 away from the transition section 1-1 is 1.50m, which is larger than the inner diameter of the side close to the transition section 1-1, and forms an inclination angle of 3°. The depth of the groove 1-3 is 30% of the wall thickness of the connecting section 1-2, and the width is 45% of the length of the inner wall of the connecting section 1-2. The groove 1-3 is located in the middle of the connecting section 1-2;

[0112] The pipe body 2 of the tough connection underground drainage pipe is made of ordinary concrete material, and the connection structure 1 is composed of the components and parts in Table 5;

[0113] Table 5

[0114]

[0115] Step 5: Filling the connection structure: Use sesame oil to seal the gap between the connection section 1-2 and the pipe body 2 of the adjacent pipe in the underground drainage pipe obtained in step 4 to ensure that the filling is dense;

[0116] Step 6, grouting: injecting the geopolymer sealing material 6 into the tough underground drainage pipe after plugging in step 5 from the grouting port 1-4 until the sealing material is evenly discharged from the exhaust port 1-5, thereby obtaining a connected tough underground drainage pipe;

[0117] The geopolymer sealing material 6 is composed of the ingredients and parts shown in Table 6;

[0118] Table 6

[0119]

[0120]

[0121] Step 7, inspection well construction: according to the design drawings, build or cast the inspection well that matches the connection toughness obtained in step 6 to connect the underground drainage pipe, and ensure that the size, elevation and verticality of the inspection well meet the requirements, and the surface of the well is flat and smooth;

[0122] Step 8: Water-tightness test: 5 hours after the injection of geopolymer sealing material 6 in step 6 is completed, a water-tightness test is performed to check the tightness of the pipeline and any leakage is promptly handled;

[0123] Step 9. Backfill the trench: After the closed water test in step 8 is passed, backfill the trench in time. Use soil that meets the requirements as the backfill material, compact it layer by layer, ensure the quality of backfill, and complete the construction of the ductile connection underground drainage pipeline.

[0124] After testing, it was found that the resiliently connected underground drainage pipe constructed in this embodiment allows the pipe itself to undergo a certain amount of settlement or deformation, thereby reducing the requirements for the foundation at the bottom of the pipe and improving the durability of the resiliently connected underground drainage pipe.

[0125] Example 4

[0126] This embodiment includes the following steps:

[0127] Step 1: Measurement and layout: Use measuring instruments to measure and layout the pipeline centerline and inspection well;

[0128] Step 2: Trench excavation: According to the measurement and layout in step 1, the trench is excavated mechanically, with manual assistance, and the trench excavation depth and slope are strictly controlled, and the earth and debris in the trench are cleaned;

[0129] Step 3: Construction of pipeline foundation: According to the trench excavated in step 2 and the geological conditions, a sand foundation is set in the trench;

[0130] Step 4: Pipeline laying: Use a crane to lift the multi-section resilient underground drainage pipeline into the trench where the foundation is set in step 3, and then install it with manual assistance to obtain the installed resilient underground drainage pipeline; when the resilient underground drainage pipeline is placed, it should be ensured that the exhaust port 1-5 faces upward, and the grouting port 1-4 is located at the lower side, so that grouting can be achieved on the side of the pipeline and exhaust at the top;

[0131] The length of the tough underground drainage pipe is 3m, the inner diameter of the pipe body 2 is 1.2m, and the outer diameter is 1.44m. The inner diameter of the connecting section 1-2 of the connecting structure 1 away from the transition section 1-1 is 1.51m, which is larger than the inner diameter of the side close to the transition section 1-1, and forms an inclination angle of 4°. The depth of the groove 1-3 is 35% of the wall thickness of the connecting section 1-2, and the width is 60% of the length of the inner wall of the connecting section 1-2. The groove 1-3 is located in the middle of the connecting section 1-2;

[0132] The pipe body 2 of the tough connection underground drainage pipe is made of ordinary concrete material, and the connection structure 1 is composed of the components and parts in Table 7;

[0133] Table 7

[0134]

[0135] Step 5: Filling the connection structure: Use sesame oil to seal the gap between the connection section 1-2 and the pipe body 2 of the adjacent pipe in the underground drainage pipe obtained in step 4 to ensure that the filling is dense;

[0136] Step 6, grouting: injecting the geopolymer sealing material 6 into the tough underground drainage pipe after plugging in step 5 from the grouting port 1-4 until the sealing material is evenly discharged from the exhaust port 1-5, thereby obtaining a connected tough underground drainage pipe;

[0137] The geopolymer sealing material 6 is composed of the ingredients and parts shown in Table 8;

[0138] Table 8

[0139]

[0140] Step 7, inspection well construction: according to the design drawings, build or cast the inspection well that matches the connection toughness obtained in step 6 to connect the underground drainage pipe, and ensure that the size, elevation and verticality of the inspection well meet the requirements, and the surface of the well is flat and smooth;

[0141] Step 8: Water-tightness test: 5 hours after the injection of geopolymer sealing material 6 in step 6 is completed, a water-tightness test is performed to check the tightness of the pipeline and any leakage is promptly handled;

[0142] Step 9. Backfill the trench: After the closed water test in step 8 is passed, backfill the trench in time. Use soil that meets the requirements as the backfill material, compact it layer by layer, ensure the quality of backfill, and complete the construction of the ductile connection underground drainage pipeline.

[0143] After testing, it was found that the resiliently connected underground drainage pipe constructed in this embodiment allows the pipe itself to undergo a certain amount of settlement or deformation, thereby reducing the requirements for the foundation at the bottom of the pipe and improving the durability of the resiliently connected underground drainage pipe.

[0144] The mass ratios of the components in the geopolymer sealing materials in Examples 2 to 4 all meet the requirements of Table 9;

[0145] Table 9

[0146]

[0147] The coal gasification slag in the geopolymer sealing material 6 in Examples 2 to 4 is Shaanxi Texaco slag, the fly ash is of first-grade quality, and the metakaolin is of medium quality, which are calcined at 700° C. to 900° C. for 12 hours and ground into powder.

[0148] After testing, the connection structure 1 obtained in Examples 1 to 3 meets the requirements of Class I pipes.

[0149] Table 10 Performance indicators of the connection structure

[0150]

[0151] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A flexible underground drainage pipe, characterized in that: The ductile connecting underground drainage pipeline comprises a pipeline body (2) and a connecting structure (1) arranged at one end of the pipeline body (2), the connecting structure (1) comprising a transition section (1-1) having an inner diameter identical to that of the pipeline body (2) and a connecting section (1-2) having an inner diameter slightly larger than the outer diameter of the pipeline body (2), an annular groove (1-3) being provided inside the connecting section (1-2), and a grouting port (1-4) and an exhaust port (1-5) being provided on the connecting section (1-2) for connecting the groove (1-3) with the outside.

2. A flexible underground drainage pipe according to claim 1, characterized in that: The connecting structure (1) and the pipeline main body (2) are both composed of concrete and pipeline steel bars inside the concrete. The pipeline steel bars include inner longitudinal bars (3) located on the inside and outer longitudinal bars (4) located on the outside. The inner longitudinal bars (3) and the outer longitudinal bars (4) are both matched with a plurality of annular bars (5). The connecting structure (1) and the pipeline main body (2) use continuous inner longitudinal bars (3) and outer longitudinal bars (4).

3. The flexible underground drainage pipe according to claim 1, characterized in that: The inner diameter of the connecting section (1-2) is 4 cm to 7 cm larger than the outer diameter of the pipeline body (2).

4. The flexible underground drainage pipe according to claim 1, characterized in that: The inner diameter of the connecting section (1-2) on the side away from the transition section (1-1) is larger than the inner diameter on the side close to the transition section (1-1), and forms an inclination angle of 2° to 4°.

5. The flexible underground drainage pipe according to claim 1, characterized in that: The depth of the groove (1-3) is 25% to 35% of the wall thickness of the connecting section (1-2), and the width is 30% to 60% of the length of the inner wall of the connecting section (1-2). The groove (1-3) is located in the middle of the connecting section (1-2).

6. The flexible underground drainage pipe according to claim 1, characterized in that: The angle between the grouting port (1-4) and the exhaust port (1-5) and the center of the cross section of the pipeline body (2) is 120° to 150°, and the exhaust port (1-5) faces upward. The diameter of the grouting port (1-4) is 3 cm to 6 cm.

7. The flexible underground drainage pipe according to claim 1, characterized in that: The pipeline body (2) and the connecting structure (1) are cast in two steps. The pipeline body (2) is cast first. After the casting of the pipeline body (2) is completed and within 2 hours before the final setting, the connecting structure (1) is cast and the casting is completed before the final setting of the cast pipeline body (2). Before the casting of the connecting structure (1), the interface between the pipeline body (2) and the connecting structure (1) is roughened.

8. The flexible underground drainage pipe according to claim 1, characterized in that: The connection structure (1) is cast with a high-ductility concrete material, wherein the high-ductility concrete material comprises: cement, fly ash, quartz sand, water, a water reducing agent, PE fiber or PVA fiber, and an admixture is further added to the high-ductility concrete material, and the mix ratio thereof satisfies the following conditions: ① The water-binder ratio is 0.27-0.45; ②The volume content of the fiber is 0.5% to 2%; ③The mass dosage of water reducing agent is not less than 1%; ④The sand-to-glue ratio is 0.3-0.

45.

9. The flexible underground drainage pipe according to claim 1, characterized in that: The grooves (1-3) of the connecting structure (1) are sealed by injecting geopolymer material, wherein the geopolymer sealing material (6) comprises: coal gasification slag, fly ash, metakaolin, sodium silicate powder, sodium aluminosilicate powder, nano silicon dioxide, solid sodium hydroxide powder and water; the molecular molar numbers of SiO2, Al2O3, Na2O, NaOH and H2O in the geopolymer sealing material (6) are respectively denoted as p1, p2, p3, p4 and p5, and the following conditions are met: ①0.8 <p1 / (p3+p4 / 2)<2.6; ②3 <p1 / p2<5; ③0.5<(p3+p4 / 2) / p2<1.5; ④2 <p5 / (p3+p4 / 2)<3; ⑤ The mass of the metakaolin is 5% to 30% of the total mass of the coal gasification slag, fly ash, metakaolin, sodium silicate powder, sodium metaaluminosilicate powder and nano-silicon dioxide.

10. A construction method for ductile connection of underground drainage pipes according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: Measurement and layout: Use measuring instruments to measure and layout the pipeline centerline and inspection well; Step 2: Trench excavation: Excavate the trench according to the measurement and layout in step 1, strictly control the trench excavation depth and slope, and clean up the earth and debris in the trench; Step 3: Construction of pipeline foundation: According to the trench excavated in step 2 and the geological conditions, set up the foundation in the trench; Step 4: Pipeline laying: Use a crane to lift the multiple sections of the resilient underground drainage pipeline into the trench where the foundation is set in step 3, and then install it to obtain the installed resilient underground drainage pipeline; Step 5: Filling the connection structure: using sesame oil to seal the gap between the connection section (1-2) of the underground drainage pipe obtained in step 4 and the pipe body (2) of the adjacent pipe; Step 6, grouting: injecting the geopolymer sealing material (6) into the tough underground drainage pipe after blocking in step 5 from the grouting port (1-4) until the sealing material is evenly discharged from the exhaust port (1-5), thereby obtaining a connected tough underground drainage pipe; Step 7, inspection well construction: build or cast an inspection well in accordance with the design drawings and connect it to the underground drainage pipe with the connection toughness obtained in step 6; Step 8: Water-tightness test: 5 hours after the injection of geopolymer sealing material (6) in step 6 is completed, a water-tightness test is performed; Step 9. Backfill the trench: After the closed water test in step 8 is passed, backfill the trench in time to complete the construction of the ductile connection underground drainage pipe.

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