Low-space backfill construction method and backfill blocks for the same

Abstract

Low-space backfilling construction method for foundation trench and backfilling blocks used therefor. The method successively includes the following steps: (1) Protect the waterproof layer of the structure; (2) Level the ground of the backfilling area; (3) Divide the foundation trench into areas A and B; (4) Determine whether there are pipelines in area A. If so, proceed to step (5); if not, proceed to step (6); (5) Manufacture sub-backfilling blocks; Place the sub-backfilling blocks at the pipeline positions; Subsequently, proceed to step (6); (6) Manufacture main backfilling blocks; Place the main backfilling blocks in area A; (7) Backfill area B; (8) Area B backfilling is completed. The low-space foundation trench construction method of the present invention has high construction efficiency, can effectively ensure the construction of foundation trench backfilling, has good construction effects, and greatly reduces costs compared with directly pouring plain concrete. In addition, it can not only support the pipelines but also accommodate the deformation of the pipelines within the design range, and has good use effects.

Description

Technical Field

[0001] The present invention belongs to the technical field of backfilling construction of the fat groove, and particularly relates to a backfilling construction method for a low-space fat groove and a backfilling block for the same. Background Art

[0002] The fat groove refers to the part that is excavated more to provide an operating surface. Generally, it refers to the space between the basement exterior wall or the foundation exterior wall of a building and the edge of the foundation pit.

[0003] After the construction is completed, the fat groove needs to be backfilled. The compacted backfill soil can provide a preliminary waterproof effect for the building structure. To ensure the use effect, the exterior wall waterproofing needs to be done well before backfilling the fat groove.

[0004] However, the problems that exist during backfilling are as follows: 1. During backfilling construction, incorrect mechanical ramming, backfilling materials, and backfilling methods can all cause damage to the waterproofing. Even when pasting a waterproof protective layer, the waterproof layer can still be damaged. Therefore, backfilling techniques need to be mastered and protection work before backfilling needs to be done well. 2. The backfill soil will move over time, resulting in a poor effect of the fat groove.

[0005] The current construction method for the fat groove is: placing the backfill soil into the fat groove and then compacting it.

[0006] However, in special cases, such as when there is a cantilever structure, the fat groove under the cantilever structure is often of low height. After filling the backfill soil into this low space, problems such as inability to mechanically compact often occur.

[0007] To solve this problem, the patent document with the publication number of CN115748743A records the following technical solution: dividing the fat groove of the cantilever structure into areas, using machine compaction for the parts that can be machine-compacted, and using manual compaction for the parts where the machine compaction space is insufficient. At the same time, retaining plates are arranged in the fat groove to reduce the movement of the backfill soil under the cantilever structure. This solution can solve the problem of backfill compaction of low-space backfill soil.

[0008] However, the following problems will occur during its construction: 1. The construction intensity of the manually compacted part is large, and at the same time, due to insufficient space, the construction is inconvenient; 2. When there are pipelines in the fat groove, the pipelines cannot be protected; 2. The construction speed is slow, and the retaining structure needs to be moved little by little, seriously affecting the construction efficiency. Summary of the Invention

[0009] The present invention aims to provide a backfilling construction method for a low-space fat groove and a backfilling block for the same with good construction effect and fast construction speed.

[0010] To solve the above technical problems, the present invention provides the following technical solutions: a low-space backfill construction method for a foundation pit, and the method successively includes the following steps:

[0011] (1) Protect the waterproof layer of the structure;

[0012] (2) Level the ground in the backfill area;

[0013] (3) Divide the foundation pit into areas A and B. Area A is the backfill area that is difficult to operate and compact, and area B is the backfill area that is easy to operate and compact;

[0014] (4) Determine whether there are pipelines in area A. If so, go to step (5); if not, go to step (6);

[0015] (5) Make sub-backfill blocks; place the sub-backfill blocks at the pipeline positions, and the sub-backfill blocks elastically support the pipelines; then go to step (5);

[0016] (6) Make main-backfill blocks; place the main-backfill blocks in area A; stack the main-backfill blocks vertically and place them side by side horizontally; ensure that the main-backfill blocks are in close contact with each other, and the main-backfill block at the top is in close contact with the underside of the cantilever structure; until area A is filled;

[0017] (7) Backfill area B;

[0018] (8) After area B is backfilled, compact area B.

[0019] The construction method for protecting the waterproof layer of the structure is as follows: First, heat the asphalt; then, apply the heated asphalt liquid to the outside of the waterproof layer.

[0020] The method for making the main-backfill blocks is as follows: Prepare a main container with an open top, place the backfill soil in the main container, and then compact it; finally, cover a water-retaining film on the top of the main-backfill block for later use, and remove the water-retaining film from the top of the main-backfill block during construction.

[0021] The method for determining the length of the main container is as follows: First, determine the length L of the cantilever structure, then the length of the main container is: L + 200 mm.

[0022] The method for determining the height of the main container is as follows: First, determine the height H1 from the lower edge of the pipeline to the bottom surface inside the foundation pit and the outer diameter H2 of the pipeline, then the height of the main container is: H = 4(H1 + H2).

[0023] The method for making the sub-backfill blocks is as follows:

[0024] 1) Measure the outer diameter of the pipeline;

[0025] 2) Make a sub-container. The height of the sub-container is the same as that of the main container; the length of the sub-container is the sum of the lengths of Area A and Area B. The sub-container includes an upper container and a lower container. There is an upper concave upper cavity on the bottom surface of the upper container; there is a lower concave lower cavity on the top surface of the lower container. The circles where the cross-sections of the upper cavity and the lower cavity are located are concentric, and have the same radius, and the inner diameter of the circle where the cross-section is located is greater than the outer diameter of the pipe.

[0026] 3) First, fill the lower container with backfill soil, then seal the bottom surface of the lower container, invert it and then fill the upper container with backfill soil.

[0027] 4) Wrap an elastic wrapping component around the outside of the pipe.

[0028] 5) Place the lower container below the elastic wrapping component, with the lower part of the elastic wrapping component located in the lower cavity of the lower container; then place the upper container above the elastic wrapping component, with the upper part of the elastic wrapping component located in the upper cavity of the upper container.

[0029] 6) Weld and fix the upper container and the lower container.

[0030] 7) Seal the elastic wrapping component and the upper and lower cavities, reserve a pouring port, and pour concrete into the pouring port.

[0031] Subsequently, perform step (2).

[0032] The elastic wrapping component includes a covering pipe and an elastic unit connected inside the covering pipe; the construction method of wrapping the elastic wrapping component around the outside of the pipe is as follows:

[0033] 1) Select a covering pipe.

[0034] 2) Cut the covering pipe transversely along the length direction into two half-covering pipes.

[0035] 3) Fix and connect elastic units on the inner surfaces of the two half-covering pipes. The elastic unit includes a spring connected to the inner surface of the covering pipe and an arc-shaped plate connected to the end of the spring.

[0036] 4) The arc-shaped plates of the two half-covering pipes are arranged oppositely.

[0037] 5) Place the two half-covering pipes opposite to each other, and make the pipe fit the arc surfaces of the two arc-shaped plates. Fill support wooden squares between the two covering pipes and the pipe.

[0038] 6) Place the upper container below the half-covering pipe located below and place the upper container above the covering pipe located above.

[0039] 7) Fill support wooden squares between the upper container and the covering pipe located above.

[0040] 8) The upper container and the lower container are fixedly connected and sealed at the ends; concrete is poured between the upper container and the cladding pipe, and between the lower container and the cladding pipe.

[0041] After the construction of the elastic wrapping assembly wrapped around the outside of the pipeline is completed, the supporting wooden square between the cladding pipe and the pipeline is removed; subsequently, the ends of the cladding pipe and the pipeline are sealed with elastic rubber sheets.

[0042] The backfill block for the above-mentioned low-space fat groove backfill construction method, the backfill block includes a main backfill block and a sub-backfill block, the main backfill block includes a main container and backfill soil filled in the main container; the sub-backfill block includes a sub-container, the sub-container includes an upper container and a lower container fixedly connected, an upper concave upper cavity is provided on the bottom surface of the upper container; a lower concave lower cavity is provided on the top surface of the lower container, the circles where the cross-sections of the upper cavity and the lower cavity are located are concentric and have the same radius.

[0043] For the backfill block used in the low-space fat groove backfill, semi-cladding pipes are arranged in a matching manner in both the upper cavity and the lower cavity, and elastic units are fixedly connected to the inner surfaces of the two semi-cladding pipes; the elastic unit includes a spring connected to the inner surface of the semi-cladding pipe and an arc-shaped plate connected to the end of the spring; the arc-shaped plates of the two semi-cladding pipes are arranged oppositely.

[0044] Through the above technical solutions, the beneficial effects of the present invention are: (1) By dividing the fat groove into areas, for areas that are not easy to compact, the method of using the main backfill block for backfill can be adopted. The main backfill block can be made in advance and directly used during use. The production and backfill of the main backfill block can be carried out simultaneously, improving the construction efficiency; (2) Using the sub-backfill block to elastically support the pipeline can not only realize the support of the pipeline but also ensure that the pipeline can move within a certain range, effectively solving the problem of pipeline movement caused by foundation settlement and ensuring the normal use of the pipeline. (3) The provided main backfill block can protect the backfill soil and prevent the backfill soil from shifting in the fat groove over time. (4) Compared with directly pouring plain concrete into the fat groove, this construction method greatly reduces the cost and has a good backfill effect, and can obtain relatively high strength. Description of the Drawings

[0045] Figure 1 It is a schematic diagram of the fat groove structure of the present invention;

[0046] Figure 2 It is a flow chart of the construction method of the present invention;

[0047] Figure 3 It is a flow chart of the construction method of the sub-backfill block;

[0048] Figure 4 It is a schematic diagram of the structure of the main backfill block;

[0049] Figure 5Schematic diagram of the sub-backfill block structure;

[0050] Figure 6 Schematic diagram of the decomposition of the sub-backfill block;

[0051] Figure 7 Schematic diagram of the elastic wrapping component structure. Specific implementation manner

[0052] The construction method for backfilling the low-space fat groove is as Figures 1 to 7 shown. Among them, the low space refers to the space below the cantilever structure 1. Although the space is relatively high before backfilling, as the backfill soil 5 increases, the space height will gradually decrease, ultimately resulting in the inability of the machine compaction equipment to enter this space.

[0053] The construction method of the present invention can realize the construction of backfilling the low-space fat groove, with fast construction speed and good construction effect. The method successively includes the following steps:

[0054] Step (1): Protect the waterproof layer of the structure; among them, the method for protecting the waterproof layer of the structure is as follows: First, heat the asphalt; subsequently, apply the heated asphalt liquid to the outside of the waterproof layer; the preliminary protection of the waterproof layer can be realized by this method. Then, the subsequent steps can be carried out.

[0055] Step (2): Level the ground in the backfill area; thus facilitating subsequent construction.

[0056] Step (3): Divide the fat groove into areas, namely area A2 and area B3. Among them, area A2 is the backfill area that is not easy to operate and compact, and area B3 is the backfill area that is easy to operate and compact. Among them, area A2 is the part below the cantilever structure 1, and area B3 is the part not below the cantilever structure 1.

[0057] Step (4): Determine whether there is a pipeline 12 in area A2. If so, proceed to step (5); if not, proceed to step (6).

[0058] Step (5): Manufacture the sub-backfill block; place the sub-backfill block at the position of the pipeline 12, and the sub-backfill block elastically supports the pipeline 12; then proceed to step (6).

[0059] Among them, the manufacturing method of the sub-backfill block is as follows:

[0060] 1) Measure the outer diameter of the pipeline 12;

[0061] 2) Fabricate a sub-container with the same height as the main container 4; the length of the sub-container is the sum of the lengths of area A2 and area B3; the sub-container includes an upper container 6 and a lower container 74, and there is an upward concave upper cavity 13 on the bottom surface of the upper container 6; there is a downward concave lower cavity 14 on the top surface of the lower container 74. The circles where the cross-sections of the upper cavity 13 and the lower cavity 14 are located are concentric, have the same radius, and the inner diameter of the circle where the cross-section is located is greater than the outer diameter of the pipeline 12.

[0062] 3) First, fill the lower container 74 with backfill soil 5, then seal the bottom surface of the lower container 74, invert the lower container 74 so that the lower cavity 14 faces upward, and then fill the upper container 6 with backfill soil 5;

[0063] 4) Clean the outer wall of the pipeline 12. After cleaning, wrap an elastic wrapping component 15 around the outside of the pipeline 12;

[0064] 5) Place the lower container 74 below the elastic wrapping component 15, with the lower part of the elastic wrapping component 15 located in the lower cavity 14 of the lower container 74; then place the upper container 6 above the elastic wrapping component 15, with the upper part of the elastic wrapping component 15 located in the upper cavity 13 of the upper container 6;

[0065] 6) Weld and fix the upper container 6 and the lower container 74 completely and hermetically.

[0066] 7) Seal the elastic wrapping component 15 and the upper and lower cavities 14, reserve a pouring port, pour concrete into the pouring port, and ensure the support for the pipeline 12 by pouring concrete to prevent the pipeline 12 from bending.

[0067] In this embodiment, the concrete is poured into the part of the upper and lower cavities 14 outside the elastic wrapping component 15, effectively providing support for the pipeline 12.

[0068] For the construction method of the elastic wrapping component 15, as follows:

[0069] The elastic wrapping component 15 includes a covering pipe and an elastic unit connected inside the covering pipe;

[0070] Its construction method is:

[0071] 1) Select a covering pipe;

[0072] 2) Cut the covering pipe transversely along the length direction into two semi-covering pipes 9;

[0073] 3) Fix and connect elastic units on the inner surfaces of the two semi-covering pipes 9. The elastic unit includes a spring 11 connected to the inner surface of the covering pipe and an arc-shaped plate 10 connected to the end of the spring 11;

[0074] 4) The arc-shaped plates 10 of the two semi-covering pipes 9 are arranged oppositely;

[0075] 5) Place the two semi-encapsulating pipes 9 opposite to each other, and make the pipe 12 fit against the arc surfaces of the two arc-shaped plates 10. Fill the supporting wooden square between the two encapsulating pipes and the pipe 12. The supporting wooden square reduces the extrusion on the encapsulating pipes when pouring concrete, ensuring the positioning of the encapsulating pipes.

[0076] 6) Place the upper container 6 below the semi-encapsulating pipe 9 located below, and place the upper container 6 above the encapsulating pipe located above.

[0077] 7) Fill the supporting wooden square between the upper container 6 and the encapsulating pipe located above to support the upper container 6.

[0078] 8) The upper container 6 and the lower container 74 are fixedly connected and the ends are sealed. Pour concrete between the upper cavity of the upper container 6 and the encapsulating pipe, and between the lower cavity of the lower container 74 and the encapsulating pipe.

[0079] After the construction of the elastic wrapping assembly 15 wrapped around the outside of the pipe 12 is completed and the concrete curing is completed, remove the supporting wooden square between the encapsulating pipe and the pipe 12. Subsequently, seal the ends of the encapsulating pipe and the pipe 12 with elastic rubber sheets.

[0080] Step (6) Make the main backfill blocks; place the main backfill blocks in area A2; stack the main backfill blocks vertically and place them side by side horizontally; ensure that the main backfill blocks are in close contact with each other, and the main backfill block at the top is in close contact with the underside of the cantilever structure 1; until area A2 is filled up.

[0081] Among them, the method for making the main backfill blocks is as follows: Prepare the main container 4 with an open top. The method for determining the length of the main container 4 is: first determine the length L of the cantilever structure 1, then the length of the main container 4 is: L + 200 mm. The method for determining the height of the main container 4 is: first determine the height H1 from the lower edge of the pipe 12 to the bottom surface of the waste pit, and the outer diameter H2 of the pipe 12, then the height of the main container 4 is: H = 4(H1 + H2).

[0082] The height of the waste pit under the cantilever structure 1 is: H 总 , H 总 / = nH + b, then the height of the topmost main backfill block is b.

[0083] Place the backfill soil 5 into the main container 4, and then carry out compaction treatment; finally, cover the top of the main backfill block with a water-retaining film for later use, and remove the water-retaining film from the top of the main backfill block during construction.

[0084] By setting the main backfill block, on the one hand, it causes extremely low damage to the waterproof layer of the structure, does not show the phenomenon of rubbing the waterproof layer, and reduces the construction requirements for the waterproof protection layer; on the other hand, its backfill speed is fast, the cost is low, and the backfill effect is not discounted at all.

[0085] Step (7) Backfill area B3; backfill the backfill soil 5 into area B3, and compact area B3 by machine during the backfill process.

[0086] Step (8) After the backfill of area B3 is completed, perform overall compaction treatment on area B3.

[0087] After the construction is completed, during the use process, the constructed main backfill block and the constructed sub-backfill block have a fast construction speed, can greatly improve the backfill speed, are not affected by the narrow space, and complete the compaction of the backfill soil 5 outside the side ditch in advance. It only needs to place the backfill soil 5 in the set area of the side ditch. In addition, the set main backfill block and sub-backfill block can play a certain supporting role for the cantilever structure 1, with high supporting strength, and can also effectively avoid the movement of the soil, ensuring the backfill effect. Finally, the elastic support of the pipeline 12 is set, which can not only realize the support of the pipeline 12, but also ensure the movement of the pipeline 12 within a certain range, effectively solving the problem of the movement of the pipeline 12 caused by the foundation settlement and ensuring the normal use of the pipeline 12.

[0088] The low-space side ditch construction method of the present invention has high construction efficiency, can effectively ensure the construction of the side ditch backfill, has good construction effects, and compared with directly pouring plain concrete, the cost is greatly reduced. In addition, it can not only support the pipeline 12, but also adapt to the deformation of the pipeline 12 within the design range, and has good use effects.

[0089] The present invention also discloses a backfill block for the above-mentioned low-space side ditch backfill construction method, as Figures 4 to 7 shown, wherein, the backfill block includes a main backfill block and a sub-backfill block; the sub-backfill block is used for filling at the pipeline 12, while the main backfill block is used for filling other areas; the height of the sub-backfill block is the same as the height of the main backfill block.

[0090] Of course, during the implementation, it is necessary to first determine the height H1 from the lower edge of the pipeline 12 to the inner bottom surface of the side ditch and the outer diameter H2 of the pipeline 12. Since the outer diameter of the main water pipe of the drainage pipe is generally 110mm, the height from the bottom surface of the side ditch is generally: 50 - 60mm. Then the height of the sub-backfill block is: H = 4(H1 + H2). The height of the main backfill block is the same as the height of the sub-backfill block; only in the highest layer, if it is not enough to fill the entire main backfill block, the height of the main backfill block needs to be adaptively modified. Specifically: the height of the side ditch under the cantilever structure 1 is: H 总 ,H 总 / = nH + b, then the height of the main backfill block in the highest layer is b.

[0091] The main backfill block includes a main container 4 and backfill soil 5 filled in the main container 4. When in use, the backfill soil 5 has been compacted in the external environment. The sub-backfill block includes a sub-container, and the sub-container includes an upper container 6 and a lower container 74 that are fixedly connected. An upper concave upper cavity 13 is provided on the bottom surface of the upper container 6; a lower concave lower cavity 14 is provided on the top surface of the lower container 74. The circles where the cross-sections of the upper cavity 13 and the lower cavity 14 are located are concentric and have the same radius. The upper cavity 13 and the lower cavity 14 are respectively used to accommodate the pipeline 12 and play a supporting role for the pipeline 12.

[0092] In addition, semi-encapsulating pipes 9 are cooperatively arranged in both the upper cavity 13 and the lower cavity 14. Among them, the two semi-encapsulating pipes 9 are fixedly connected, and concrete 8 is filled in the gaps between the two semi-encapsulating pipes 9 and the upper cavity 13 and the lower cavity 14, so as to fix the semi-encapsulating pipes 9 in the sub-container, and further avoid the extrusion of the external environment on the pipeline 12.

[0093] In order to enable the pipeline 12 to adapt to the settlement of the building structure, elastic units are fixedly connected to the inner surfaces of the two semi-encapsulating pipes 9; the elastic unit includes a spring 11 connected to the inner surface of the semi-encapsulating pipe 9 and an arc-shaped plate 10 connected to the end of the spring 11; the arc-shaped plates 10 of the two semi-encapsulating pipes 9 are arranged oppositely, and the two arc-shaped plates 10 are respectively attached to the outer wall of the pipeline 12. On the one hand, the pipeline 12 can be supported by the arc-shaped plate 10. In addition, it can adapt to the deformation of the pipeline 12 within the allowable range, realizing the soft connection between the pipeline 12 and the sub-container, that is, realizing both fixed support and allowing deformation, and avoiding the occurrence of phenomena such as bending or brittle rupture of the pipeline 12 caused by building deformation.

[0094] The backfill block structure for low-space fat groove backfill described in the present invention is novel in structure. It not only realizes the rigid support of the pipeline 12, avoiding the influence or bending of the external environment on the pipeline 12, but also gives a certain allowable deformation space to the pipeline 12 inside, avoiding the bending and breaking of the pipeline 12 due to settlement. It has good use effect, effectively improves the service life of the pipeline 12, and avoids the damage of the pipeline 12.

Claims

1. Low-space backfill construction method, characterized in that: The method successively includes the following steps: (1) Protect the structure with a waterproof layer; the construction method for protecting the structure with a waterproof layer is as follows: First, heat the asphalt; subsequently, apply the heated liquid asphalt to the outer side of the waterproof layer. (2) Level the ground in the backfill area. (3) Divide the fat groove into areas A and B, where area A is the backfill area that is not easy to operate and compact, and area B is the backfill area that is easy to operate and compact. (4) Determine whether there is a pipeline in area A. If there is, proceed to step (5); if not, proceed to step (6). (5) Make a sub-backfill block; place the sub-backfill block at the pipeline position, and the sub-backfill block elastically supports the pipeline; then proceed to step (6). The method for making the sub-backfill block is as follows: 1) Measure the outer diameter of the pipeline. 2) Make a sub-container. The height of the sub-container is the same as that of the main container; the length of the sub-container is the sum of the lengths of areas A and B; the sub-container includes an upper container and a lower container. An upper concave upper cavity is provided on the bottom surface of the upper container; a lower concave lower cavity is provided on the top surface of the lower container. The circles where the cross-sections of the upper cavity and the lower cavity are located are concentric, and have the same radius, and the inner diameter of the circle where the cross-section is located is greater than the outer diameter of the pipeline. 3) First, fill the lower container with backfill soil, then seal the bottom surface of the lower container, invert it, and then fill the upper container with backfill soil. 4) Wrap an elastic wrapping component around the outside of the pipeline. 5) Place the lower container below the elastic wrapping component, with the lower part of the elastic wrapping component located in the lower cavity of the lower container; then place the upper container above the elastic wrapping component, with the upper part of the elastic wrapping component located in the upper cavity of the upper container. 6) Weld and fix the upper container and the lower container. 7) Seal the elastic wrapping component and the upper and lower cavities, reserve a pouring port, and pour concrete into the pouring port. (6) Make a main backfill block; place the main backfill block in area A; stack the main backfill blocks vertically and place them side by side horizontally; ensure that the main backfill blocks are in close contact with each other, and the main backfill block at the top is in close contact with the underside of the cantilever structure; until area A is filled up. The method for making the main backfill block is as follows: Prepare a main container with an open top, place the backfill soil in the main container, and then perform a compaction treatment; finally, cover the top of the main backfill block with a water-retaining film for standby, and remove the water-retaining film from the top of the main backfill block during construction; the method for determining the length of the main container is as follows: First, determine the length L of the cantilever structure, then the length of the main container is: L + 200 mm; the method for determining the height of the main container is as follows: First, determine the height H1 from the lower edge of the pipeline to the inner bottom surface of the fat groove, and the outer diameter H2 of the pipeline, then the height of the main container is: H = 4(H1 + H2). (7) Backfill area B. (8) After the backfill of area B is completed, perform a compaction treatment on area B.

2. The low-space fat groove backfilling construction method according to claim 1, characterized in that: The elastic wrapping component includes a covering pipe and an elastic unit connected inside the covering pipe; the construction method for wrapping the elastic wrapping component around the outside of the pipeline is as follows: 1) Select a covering pipe. 2) Horizontally cut the covering pipe along its length direction into two half-covering pipes. 3) Elastic units are fixedly connected to the inner surfaces of both half-covering pipes. The elastic unit includes a spring connected to the inner surface of the covering pipe and an arc-shaped plate connected to the end of the spring; 4) The arc-shaped plates of the two half-covering pipes are arranged oppositely; 5) Place the two half-covering pipes opposite to each other, and make the pipeline fit with the arc surfaces of the two arc-shaped plates. Fill support wooden squares between the two covering pipes and the pipeline; 6) Place the upper container below the lower half-covering pipe and above the upper covering pipe; 7) Fill support wooden squares between the upper container and the upper covering pipe; 8) The upper container and the lower container are fixedly connected and sealed at the ends. Pour concrete between the upper container and the covering pipe, and between the lower container and the covering pipe.

3. The low-space fat groove backfilling construction method according to claim 2, characterized in that: After the construction of the elastic wrapping assembly wrapped around the outside of the pipeline is completed, remove the support wooden squares between the covering pipe and the pipeline; subsequently, seal the ends of the covering pipe and the pipeline with elastic rubber sheets.

4. The backfill block for the low-space fat groove backfill construction method according to claim 3, characterized in that: The backfill block includes a main backfill block and a sub-backfill block. The main backfill block includes a main container and backfill soil filled in the main container; the sub-backfill block includes a sub-container. The sub-container includes an upper container and a lower container fixedly connected. An upper concave upper cavity is provided on the bottom surface of the upper container; a lower concave lower cavity is provided on the top surface of the lower container. The circles where the cross-sections of the upper cavity and the lower cavity are located are concentric and have the same radius.

5. The backfill block for low-space fat groove backfill according to claim 4, characterized in that: Semi-covering pipes are arranged in a matching manner in both the upper cavity and the lower cavity. Elastic units are fixedly connected to the inner surfaces of both half-covering pipes; the elastic unit includes a spring connected to the inner surface of the half-covering pipe and an arc-shaped plate connected to the end of the spring; the arc-shaped plates of the two half-covering pipes are arranged oppositely.

Images