Construction method for lightweight infill

Abstract

The application provides a lightweight replacement construction method, which comprises the following steps: forming a lightweight replacement layer by excavating earthwork; laying lightweight boards in the lightweight replacement layer layer by layer from bottom to top; laying a branch grouting pipe on the top surface of the uppermost lightweight board after laying a certain number of lightweight boards, and connecting the branch grouting pipes to a trunk grouting pipe; setting a transverse partition wall on the topmost lightweight board after laying the lightweight boards to a certain height, and protruding the trunk grouting pipe from the transverse partition wall; pressurizing and grouting the trunk grouting pipe; cutting off the protruding part of the trunk grouting pipe after a certain amount of grouting is completed, and continuously laying the lightweight boards on the transverse partition wall until the lightweight replacement layer is filled; backfilling a soil layer on the top surface of the lightweight replacement layer, and laying a cushion layer and a base layer on the soil layer in sequence. The application can reduce the load of earthwork and meet the replacement construction requirements of increasing the elevation of the construction site.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a construction method for lightweight replacement filling. Background Technology

[0002] In environments such as around tunnels or river embankments, due to new building or construction requirements, after the completion of the final road or other ground works, the ground elevation exceeds the pre-construction elevation. However, since the site itself is required to have no increase in dead load or the increase in dead load cannot exceed a certain range, in order to avoid a significant impact on the soil load changes of important buildings or projects such as tunnels and river embankments, it is necessary to consider replacement, replacing conventional earthwork with lightweight materials to reduce the soil pressure on the surrounding area in the replacement area.

[0003] When the site elevation increases significantly after construction or a substantial reduction in soil load is required, conventional methods such as replacing the earthwork with lightweight concrete or other commonly used materials can often only reduce the load on the replacement soil volume by 1 / 2 to 1 / 10. The reduction in soil load is minimal and cannot meet the requirements of the replacement construction. Summary of the Invention

[0004] In view of the above, the present invention provides a construction method for lightweight replacement, which can reduce the soil load significantly after lightweight replacement and meet the replacement construction requirements of a large increase in site elevation after construction.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is to provide a construction method for lightweight replacement filling, which includes:

[0006] The earthwork is excavated to form a lightweight replacement layer, and then the earthwork under the lightweight replacement layer is leveled to form a leveling layer.

[0007] Lightweight panels are laid layer by layer from bottom to top in the lightweight replacement layer. After several layers of lightweight panels are laid, branch grouting pipes are laid on the top surface of the uppermost lightweight panel. Multiple branch grouting pipes are connected to the main grouting pipe.

[0008] After laying lightweight panels to a certain height, a horizontal partition wall is set on the topmost lightweight panel, and the main grouting pipe protrudes from the horizontal partition wall. Then, the main grouting pipe is pressurized for grouting.

[0009] After a certain amount of grouting is completed, the protruding part of the main grouting pipe is cut off, and the lightweight board, branch grouting pipe, and main grouting pipe are continued to be laid on the transverse partition wall until the lightweight replacement layer is filled.

[0010] After the lightweight replacement layer is filled, a soil layer is backfilled on top of the lightweight replacement layer, a cushion layer is laid on top of the backfill layer, and a base layer is laid on top of the cushion layer.

[0011] Preferably, adjacent lightweight panels are connected by an adhesive.

[0012] Preferably, the lowest layer of lightweight sheet material within each of the transverse partition walls is fixed to the transverse partition wall or the leveling layer.

[0013] Preferably, the lightweight replacement layer is further provided with vertical partition walls. Before laying the lightweight panels, vertical partition walls of equal height are provided at intervals in the lightweight replacement layer, and filling units are formed between the vertical partition walls. The lightweight panels are then laid layer by layer from bottom to top in the filling units.

[0014] Preferably, the horizontal partition wall and the vertical partition wall are made of reinforced concrete. After the horizontal partition wall reaches a certain strength, the main grouting pipe is pressurized and grouted.

[0015] Preferably, a partition wall is provided at the location of the pipeline to separate the pipeline from the lightweight board. The partition wall is made of reinforced concrete and is constructed at the same time as the vertical partition wall. The partition wall is backfilled with soil outside the pipeline.

[0016] Preferably, the lightweight sheet material is XPS or EPS.

[0017] The beneficial effects of this invention are that its lightweight replacement construction method uses lightweight panels for layered replacement, with grouting within each layer, ensuring that the replaced area, as a subgrade or foundation layer, meets the strength and stiffness requirements for road or site use. This lightweight replacement construction method of the present invention, on the one hand, significantly reduces soil load, meeting the requirements for replacement construction with a substantial increase in site elevation after construction; on the other hand, it meets the strength and stiffness requirements for road or site use. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Fig. 1 This is a schematic diagram of the overall structure of the lightweight replacement layer in the construction method of the lightweight replacement of the present invention.

[0020] Fig. 2 This is a schematic diagram of the structure of a single filling unit of the lightweight replacement layer in the construction method of the lightweight replacement layer of the present invention.

[0021] The correspondence between the reference numerals and components in the attached drawings is as follows:

[0022] 1-Earth excavation; 2-Leveling layer; 3-Lightweight replacement layer; 4-Backfill layer; 5-Subbase; 6-Base layer; 7-Lightweight board; 8-Horizontal partition wall; 9-Vertical partition wall; 10-Partition wall; 11-Pipeline; 12-Backfill; 13-Branch grouting pipe; 14-Main grouting pipe. Detailed Implementation

[0023] To facilitate understanding of the present invention, the following description is provided in conjunction with the accompanying drawings and embodiments.

[0024] Please see Figs. 1-2 The present invention provides a construction method for lightweight replacement, including a lightweight replacement layer 3, lightweight board 7, branch grouting pipe 13, main grouting pipe 14, and transverse partition wall 8.

[0025] in:

[0026] The first step is to form a lightweight replacement layer 3;

[0027] The lower earthwork 1 is excavated to form a lightweight replacement layer 3, and then the earthwork 1 under the lightweight replacement layer 3 is leveled to form a leveling layer 2.

[0028] The second step is to lay lightweight boards 7 inside the lightweight replacement layer 3;

[0029] like Fig. 2 As shown, firstly, branch grouting pipes 13 are laid above the leveling layer 2. Branch grouting pipes 13 connect to main grouting pipes 14, which can consist of multiple main grouting pipes. Then, lightweight panels 7 are laid layer by layer on the branch grouting pipes 13 from bottom to top, with adjacent layers of lightweight panels 7 laid in a staggered manner to enhance the integrity of each area. When laying the lightweight panels 7 above the branch grouting pipes 13, holes are made in the lightweight panels 7 to allow the main grouting pipes 14 to pass through. After laying two to three layers of lightweight panels 7, branch grouting pipes 13 are laid again on the top layer of lightweight panels 7, connecting to the main grouting pipes 14. Then, the laying of lightweight panels 7 and branch grouting pipes 13 is repeated.

[0030] Preferably, adjacent lightweight panels 7 are connected by adhesive, and the bottom lightweight panel 7 is fixed to the leveling layer 2 by fasteners such as nails or expansion bolts.

[0031] The third step is to install partition walls and perform grouting.

[0032] After laying a certain height of lightweight slabs 7, a horizontal partition wall 8 is set on the topmost lightweight slab 7, and the main grouting pipe 14 protrudes out of the horizontal partition wall 8, and then pressure grouting is applied to the main grouting pipe 14.

[0033] Preferably, the transverse partition wall 8 uses a reinforced concrete structure to ensure the strength and rigidity of the transverse partition wall 8 itself and the overall rigidity of the replacement area, as well as to facilitate the zoning and fixing of the panels. The main grouting pipe 14 protrudes from the topmost lightweight panel 7, and concrete is poured onto the topmost lightweight panel 7 to form the transverse partition wall 8, thus causing the main grouting pipe 14 to protrude from the transverse partition wall 8. Furthermore, after the transverse partition wall 8 has reached a certain strength, pressure grouting is applied to the main grouting pipe 14.

[0034] Step 4: Repeat the installation of horizontal partition walls and filling with lightweight panels 7;

[0035] After a certain amount of grouting is completed, the protruding part of the main grouting pipe 14 is cut off, and lightweight panels 7, branch grouting pipes 13, and main grouting pipes 14 are continued to be laid on the transverse partition wall 8 until the lightweight replacement layer 3 is filled. First, the branch grouting pipes 13 are laid on top of the transverse partition wall 8, and then the lightweight panels 7 are laid. The bottom layer of lightweight panels 7 is fixed to the transverse partition wall 8 with fixing parts such as nails or expansion bolts.

[0036] In a preferred embodiment, vertical partition walls 9 are also provided within the lightweight replacement layer 3. The vertical partition walls 9 are also reinforced concrete structures. After leveling the earthwork 1, vertical partition walls 9 of equal height are first poured at intervals within the lightweight replacement layer 3, forming filling units between them. Within these filling units, lightweight panels 7 and branch grouting pipes 13 and main grouting pipes 14 are laid layer by layer from bottom to top. When the lightweight panels 7 are filled to the same height as the vertical partition walls 9, concrete is poured on the top layer of lightweight panels 7 to form a horizontal partition wall 8. Then, vertical partition walls 9 of equal height are poured at intervals on the horizontal partition walls 8, and filling continues within the filling units formed within the vertical partition walls 9. The pouring of horizontal partition walls 8 and vertical partition walls 9, as well as the filling of lightweight panels 7, are repeated until the lightweight replacement layer 3 is completely filled.

[0037] As a preferred implementation, multiple pressure sensors can be installed in each filling unit, and grouting is stopped once the grouting pressure reaches a certain strength.

[0038] As a preferred implementation method, such as Fig. 1 As shown, a partition wall 10 is provided at the location corresponding to pipeline 11 to separate pipeline 11 from lightweight sheet 7. The partition wall 10 is made of reinforced concrete. The construction of the partition wall 10 is carried out at the same time as the vertical partition wall 9. Furthermore, the partition wall 10 is backfilled with soil layer 12 on the outside of pipeline 11 and compacted to ensure the long-term safety of pipeline during use.

[0039] Fifth step: Backfill above the lightweight replacement layer 3;

[0040] like Fig. 1As shown, after the lightweight replacement layer 3 is filled, a soil layer 4 is backfilled on the top surface of the lightweight replacement layer 3, a cushion layer 5 is laid on top of the backfill layer 4, and a base layer 6 is laid on top of the cushion layer 5.

[0041] As a preferred implementation method, lightweight boards are made of XPS or EPS materials. XPS board, short for extruded polystyrene foam board, has excellent corrosion resistance and aging resistance, and a service life of 30-40 years. EPS board, short for expandable polystyrene board, also known as polystyrene board, has the advantages of being lightweight.

[0042] The typical bulk density of earthwork is approximately 1300–1800 kg / m³. 3 The conventional method of replacement is to use lightweight concrete, such as foamed concrete, to replace the excavated soil. Its weight is generally between 500 and 1200 kg / m³. 3 .

[0043] This invention uses lightweight boards for earthwork replacement, such as XPS boards (extruded polystyrene foam boards) and EPS boards (expandable polystyrene boards), with a weight generally between 20 and 50 kg / m³. 3 Estimations show that replacing 1 cubic meter of earthwork with XPS or EPS boards can reduce the earthwork load by 10 to 60 times compared to using lightweight concrete. Therefore, replacing the same volume of earthwork with XPS or EPS boards can reduce the earthwork load significantly more than with lightweight concrete. Alternatively, to reduce the same earthwork load, using XPS or EPS boards can greatly reduce the replacement volume.

[0044] The lightweight replacement construction method of this invention employs a layer-by-layer filling approach, using lightweight panels for replacement and grouting between the panels to enhance the strength of the lightweight replacement layer. This lightweight replacement construction method of the present invention, on the one hand, can significantly reduce soil load, meeting the replacement construction requirements for large increases in site elevation after construction; on the other hand, it can meet the strength and stiffness requirements for road or site use.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A construction method for lightweight replacement filling, characterized in that, include: The earthwork is excavated to form a lightweight replacement layer, and then the earthwork under the lightweight replacement layer is leveled to form a leveling layer. Lightweight boards are laid layer by layer from bottom to top in the lightweight replacement layer. After several layers of lightweight boards are laid, branch grouting pipes are laid on the top surface of the topmost lightweight board. Multiple branch grouting pipes are connected to the main grouting pipe. After laying lightweight panels to a certain height, a horizontal partition wall is set on the topmost lightweight panel, and the main grouting pipe protrudes from the horizontal partition wall. Then, the main grouting pipe is pressurized for grouting. After a certain amount of grouting is completed, the protruding part of the main grouting pipe is cut off, and the lightweight board, branch grouting pipe, and main grouting pipe are continued to be laid on the transverse partition wall until the lightweight replacement layer is filled. After the lightweight replacement layer is filled, a soil layer is backfilled on top of the lightweight replacement layer, a cushion layer is laid on top of the backfill layer, and a base layer is laid on top of the cushion layer.

2. The construction method for lightweight replacement as described in claim 1, characterized in that, The adjacent lightweight panels are connected by an adhesive.

3. The construction method for lightweight replacement as described in claim 1, characterized in that, The lowest layer of lightweight panels within each of the horizontal partition walls is fixed to the horizontal partition wall or the leveling layer.

4. The construction method for lightweight replacement as described in claim 1, characterized in that, The lightweight replacement layer is also provided with vertical partition walls. Before laying the lightweight panels, vertical partition walls of equal height are set at intervals in the lightweight replacement layer. The vertical partition walls form filling units, and the lightweight panels are laid layer by layer from bottom to top in the filling units.

5. The construction method for lightweight replacement as described in claim 4, characterized in that, The horizontal and vertical partition walls are made of reinforced concrete. After the horizontal partition walls reach a certain strength, the main grouting pipe is pressurized and grouted.

6. The construction method for lightweight replacement as described in claim 5, characterized in that, Pipelines are installed within the lightweight replacement layer. A partition wall is provided at the location of the pipeline to separate the pipeline from the lightweight material. The partition wall is made of reinforced concrete and is constructed simultaneously with the vertical partition wall. A soil layer is backfilled inside the partition wall outside the pipeline.

7. The construction method for lightweight replacement as described in claim 5, characterized in that, The lightweight sheet material is made of XPS or EPS.

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