Construction method for backfilling and tamping first-layer foundation of building

Abstract

The invention discloses a building first-layer foundation backfilling and tamping construction method which comprises the following steps that backfilling soil is laid in a foundation pit in a layered mode and tamped to form a backfilling layer, then a guide wall is built on a foundation beam, the surface of the backfilling layer is covered with slag to form a slag layer, and the stability of the slag layer is improved through overall compaction and local tamping; wherein in local tamping, a specially-designed tamping device is adopted to be tightly attached to the inner side of the guide wall for precise tamping; in addition, the method further comprises the steps of backfilling cement stone powder on the slag layer, leveling and compacting. The effect of enhancing the stability and bearing capacity of the building first-layer foundation backfill structure is achieved, and meanwhile the construction efficiency and quality are improved.

Description

Technical Field

[0001] This application relates to the field of..., in particular to a construction method for ramming and compacting the backfill of the first-floor foundation of a building. Background Art

[0002] The backfill construction of a building foundation is one of the important links in building engineering, which directly affects the stability and durability of the building. In modern building construction, with the increase in high-rise buildings and complex structures, the technology of foundation backfill construction has developed rapidly. Reasonable backfill construction can not only improve the bearing capacity of the foundation, but also effectively reduce the settlement difference and ensure the safety performance of the building. At the same time, an efficient backfill construction method can significantly shorten the construction period, reduce costs, and create favorable conditions for subsequent construction. Therefore, this technology has important value in the construction industry.

[0003] In the prior art, in order to ensure the quality and water permeability of the foundation backfill, various construction methods are usually adopted, including backfilling and compacting slag. In the traditional layered backfill method, the soil is spread in layers and tamped layer by layer manually or mechanically. This method is simple to operate but has low efficiency. Another commonly used method is to use large mechanical equipment for overall compaction, such as a roller or a vibrating compaction device. Although this method has high efficiency, it is difficult to achieve uniform compaction in the area close to the wall or the guide wall.

[0004] However, in the prior art, when backfilling in the area close to the inner side of the guide wall, due to the limited construction space, traditional compaction equipment is difficult to operate effectively, resulting in poor compaction effect in this area, and voids or unevenness are likely to occur, thus affecting the overall backfill quality. This problem needs to be solved urgently to ensure the reliability and safety of the foundation backfill construction. Summary of the Invention

[0005] In order to improve the overall backfill quality, this application provides a construction method for ramming and compacting the backfill of the first-floor foundation of a building.

[0006] The construction method for ramming and compacting the backfill of the first-floor foundation of a building provided by this application adopts the following technical solutions: A construction method for ramming and compacting the backfill of the first-floor foundation of a building includes the following steps: S1: Backfill of the first-floor foundation of a building: Lay backfill soil in the foundation pit and compact it layer by layer to form a backfill layer; S2: Masonry of the foundation beam guide wall: Mason a guide wall on the foundation beam, and the guide wall extends along the direction of the foundation beam; S3: Slag backfill: Cover the surface of the backfill layer with slag to form a slag layer, and the slag is blocked inside the guide wall; S4: Overall compaction: Compact the slag comprehensively; S5: Local ramming: When ramming the slag near the inner side of the guide wall, first install a ramming device on the top of the guide wall. The ramming device is closely attached to the inner side of the guide wall and rams the slag near the inner side of the guide wall in the vertically downward direction. Move the ramming device along the extension direction of the guide wall to complete the ramming step of the slag at the inner side position of the guide wall.

[0007] By adopting the above technical solution, systematic construction of the backfill ramming of the first-floor foundation of the building is realized. The backfill soil is rammed in layers to form a stable backfill layer, providing reliable support for the foundation structure; the masonry of the guide wall defines the backfill boundary and plays a role in retaining soil; in addition, the guide wall on the foundation beam can not only block the slag, but also provide a reliable guiding and supporting structure for subsequent local ramming operations. After the ramming device is installed on the top of the guide wall, it can move smoothly along the extension direction of the guide wall to ensure accurate and uniform ramming of the slag at the inner side position of the guide wall. This cooperation method effectively avoids the problem of foundation settlement caused by uneven ramming in traditional construction, improves the construction efficiency and foundation stability at the same time, ensures the tight combination between the backfill layer and the slag layer, and enhances the bearing capacity of the overall structure.

[0008] Preferably, in S2, the guide wall is masoned in a way of staggering joints up and down and overlapping inside and outside, and an outer edge part is masoned at the top of the guide wall. Both sides of the outer edge part protrude from the inner and outer sides of the guide wall respectively. In S5, the ramming device is clamped with the outer edge part, and the ramming device travels along the extension direction of the guide wall under the guiding action of the outer edge part; By adopting the above technical solution, the ramming device can be clamped with the outer edge part at the top of the guide wall and travel smoothly along the extension direction of the guide wall under the guiding action of the outer edge part, so as to ensure accurate ramming of the slag at the inner side position of the guide wall. The guide wall is masoned in a way of staggering joints up and down and overlapping inside and outside, which improves the overall stability and structural strength of the guide wall. The design that both sides of the outer edge part protrude from the inner and outer sides of the guide wall provides a reliable guiding and limiting function for the ramming device, effectively avoiding the risk of device deviation or overturning during the ramming process, and further improving the quality and efficiency of the backfill construction.

[0009] Preferably, in S5, the surface of the slag layer is leveled and the whole is compacted with a roller; By adopting the above technical solution, leveling the surface of the slag layer and compacting the whole with a roller can effectively improve the flatness and density of the slag layer, reduce the possible settlement problems in the subsequent construction process, ensure the quality of the foundation backfill, and provide stable foundation conditions for the construction of the upper structure.

[0010] Preferably, in the step S5, the ramming device includes a moving body slidably engaged with the outer edge portion, a working arm provided on one side of the moving body and extending downward, and a ramming assembly provided at the lower end of the working arm. When performing the local ramming step of the S5, the moving body is installed on the top of the guide wall and slidably engaged with the outer edge portion, the working arm is close to the inner side of the guide wall, and the ramming assembly compacts the slag layer downward along the inner wall of the guide wall.

[0011] By adopting the above technical solution, the ramming device can stably travel along the guide wall through the sliding fit between the moving body and the outer edge portion, ensuring accurate positioning during the ramming process; the design of the working arm enables the ramming assembly to accurately approach the inner wall of the guide wall, realizing effective compaction of the local area of the slag layer and avoiding structural instability problems caused by insufficient compaction; the ramming assembly compacts the slag layer downward along the inner wall of the guide wall, further improving the density between the backfill layer and the guide wall and enhancing the stability of the overall structure.

[0012] Preferably, the moving body includes a machine base, traveling wheels provided at the bottom of the machine base, and two limiting arms respectively provided on both sides of the machine base. The limiting arms extend downward, and limiting wheels are provided at the inner sides of the lower ends of the two limiting arms. A driving member for driving the two limiting arms to approach or separate from each other is provided inside the machine base; in the step of positioning the ramming device in the S5, the machine base is placed on the top of the guide wall, and the moving function is realized through the traveling wheels. By starting the driving member, the two limiting arms approach each other until the inner sides of the two limiting arms respectively abut against both sides of the outer edge portion. When the ramming device moves, the two limiting wheels travel at the bottom position of the outer edge portion.

[0013] By adopting the above technical solution, the design of the moving body of the ramming device realizes accurate positioning and stable traveling on the top of the guide wall. The traveling wheels at the bottom of the machine base ensure smooth movement of the device on the guide wall, while the design of the limiting arms and their limiting wheels effectively limits the lateral offset of the device, ensuring the accuracy of the ramming operation. The use of the driving member enables the limiting arms to automatically adjust according to the size of the outer edge portion, enhancing the adaptability of the device. The overall solution improves the efficiency and quality of local compaction in the backfill construction, ensures the density of the slag layer inside the guide wall, and thus enhances the overall stability of the foundation backfill.

[0014] Preferably, a lifting assembly for driving the limiting wheels to lift and lower is provided on the limiting arms. In the step of positioning the ramming device in the S5, by starting the lifting assembly, the limiting wheels are abutted against the bottom position of the outer edge portion.

[0015] By adopting the above technical solution, the limiting wheel can adjust the contact state with the bottom of the outer edge part as needed. Specifically, the setting of the lifting assembly enables the limiting wheel to accurately reach the bottom of the outer edge part when the ramming device is in place, thereby ensuring the stable travel of the ramming device on the top of the guide wall and improving the accuracy and stability of the ramming operation. In addition, this adjustable design can also adapt to outer edge parts of different sizes, enhancing the applicability of the construction method.

[0016] Preferably, the working arm is arranged outside one of the limiting arms, and an adjusting mechanism for adjusting the horizontal and vertical positions of the ramming assembly is arranged at the lower end of the working arm; in the slag backfilling step of S3, the method of layered backfilling and compaction is adopted. In the ramming step of the ramming device in S5, the horizontal position of the ramming assembly is adjusted by horizontally moving the adjusting mechanism to make the ramming assembly close to the inner wall of the guide wall, and then according to the height position of the slag surface in the case of layered backfilling, the vertical position of the ramming assembly is adjusted by using the adjusting mechanism.

[0017] By adopting the above technical solution, the working arm is arranged outside the limiting arm and is equipped with an adjusting mechanism, which can accurately adjust the horizontal and vertical positions of the ramming assembly. During the process of layered backfilling and compaction of slag, this design enables the ramming assembly to accurately fit the inner wall of the guide wall, ensuring the effect of local ramming. At the same time, according to the height change of the layered backfilling of slag, the adjusting mechanism can flexibly adjust the vertical position of the ramming assembly to ensure that each layer of slag can be fully rammed, thereby improving the stability and density of the overall backfill structure.

[0018] Preferably, it further includes S6: Backfill cement stone powder on the slag layer to form a cement stone powder layer, and then level and compact it. The cement stone powder layer at the inner side of the guide wall is also subjected to local ramming operation by using the ramming device in S5.

[0019] By adopting the above technical solution, it is possible to further backfill cement stone powder on the slag layer to form a cement stone powder layer, and by leveling and compacting the cement stone powder layer, the stability and bearing capacity of the foundation are improved. For the cement stone powder layer at the inner side of the guide wall, the local ramming operation is carried out by using the ramming device in S5 to ensure the density of the area inside the guide wall and avoid the problem of uneven settlement of the foundation caused by local looseness, thereby improving the overall construction quality.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. By installing a ramming device at the inner side position of the guide wall and moving and ramming along the extension direction of the guide wall, the problem that it is difficult to uniformly compact in a narrow space by the traditional method is effectively solved, and the backfill density in the area close to the guide wall is significantly improved; 2. By adopting the method of combining layered backfilling and layer-by-layer compaction, not only the overall stability of the slag layer and the backfill soil is improved, but also the difference in foundation settlement is effectively reduced, and the foundation bearing capacity of the building is enhanced. 3. Through the cooperation of a specially designed ramming device and the outer edge of the guide wall, precise guidance and stable movement are achieved, ensuring the efficiency and reliability of local ramming operations, and further optimizing the quality of backfill construction. Description of the Drawings

[0021] Figure 1 It is an assembly schematic diagram between the ramming device and the guide wall in a construction method for ramming the backfill of the first-floor foundation of a building according to an embodiment of the present application.

[0022] Figure 2 It is a schematic diagram of the upper structure of the ramming device in a construction method for ramming the backfill of the first-floor foundation of a building according to an embodiment of the present application.

[0023] Figure 3 It is a schematic diagram of the lower structure of the ramming device in a construction method for ramming the backfill of the first-floor foundation of a building according to an embodiment of the present application.

[0024] Description of the reference numerals: 1, guide wall; 11, outer edge; 2, moving body; 21, machine base; 22, guide rod; 23, limiting arm; 24, traveling wheel; 25, driving member; 26, lifting assembly; 3, working arm; 31, chute; 32, horizontal threaded hole; 4, limiting wheel; 5, adjusting mechanism; 51, sliding seat; 52, sliding sleeve; 53, vertical bolt; 54, horizontal bolt; 6, ramming assembly; 61, motor; 62, mounting frame; 63, cam; 64, ejector rod; 65, hammer body; 66, pulley. Detailed Description of the Embodiment

[0025] The following is a further detailed description of the present application in conjunction with the attached Figures 1-3 drawings.

[0026] An embodiment of the present application discloses a construction method for ramming the backfill of the first-floor foundation of a building. Referring to Figure 1 , it includes the operations of backfilling the first-floor foundation of the building, masonry of the foundation beam guide wall 1, overall compaction of the slag backfill operation, local ramming operation, and cement stone powder backfill operation. Among them, each operation is carried out in a specific order, and finally the purpose of improving the ramming effect of the slag backfill near the inner side of the guide wall 1 is achieved. The specific steps are as follows: S1: Backfilling the first-floor foundation of the building: Laying backfill soil in the foundation pit and compacting it layer by layer to form a backfill layer.

[0027] S2: Masonry of the foundation beam guide wall 1: Masonry the guide wall 1 on the foundation beam, and the guide wall 1 extends along the direction of the foundation beam.

[0028] S3: Slag backfilling: Cover the backfill layer surface with slag to form a slag layer, and the slag is blocked inside the guide wall 1.

[0029] S4: Overall compaction: Compactly compact the slag.

[0030] S5: Local ramming: When ramming the slag near the inner side of the guide wall 1, first install a ramming device on the top of the guide wall 1. The ramming device is closely attached to the inner side of the guide wall 1 and rams the slag near the inner side of the guide wall 1 in the vertically downward direction. Move the ramming device along the extension direction of the guide wall 1 to complete the ramming step of the slag at the inner side position of the guide wall 1.

[0031] S6: Backfill cement stone powder on the slag layer to form a cement stone powder layer, and then level and compact it. The cement stone powder layer at the inner side of the guide wall 1 is also locally rammed using the ramming device in S5.

[0032] Specifically, the backfilling operation of the first - floor foundation of the building is to lay backfill soil in the foundation pit and compact it in layers to form a backfill layer. Among them, the backfill soil such as clay and sand is used to provide foundation bearing capacity; the compaction equipment such as rollers and plate vibrators is used to ensure the compactness of the backfill soil layer. The cooperation relationship between the backfill soil and the compaction equipment is carried out through the layered backfilling method. For example, the thickness of each backfill layer is controlled within 0.3m, and the backfilling starts from the lowest part of the site, and is paved and filled layer by layer from one end to the other end from bottom to top, and the height of each backfill layer is not greater than 0.5m.

[0033] Specifically, the masonry operation of the foundation beam guide wall 1 is to build the guide wall 1 along the trend of the foundation beam. Among them, a 200 - mm - thick MU15 autoclaved lime - sand brick wall is uniformly used. The guide wall 1 includes building blocks and mortar. The building blocks such as standard bricks and concrete blocks are used to construct the main structure of the guide wall 1; the mortar such as cement mortar and mixed mortar is used to fill the gaps between the building blocks and enhance the structural stability. The connection relationship between the building blocks and the mortar is realized through the masonry process, adopting the method of staggering joints up and down and overlapping inside and outside to ensure the overall structural strength of the guide wall 1. The masonry is built using the mortar - spreading method, and the mortar joints of the lime - sand brick masonry should be horizontal, vertical, and of uniform thickness. In addition, an outer edge part 11 is built on the top of the guide wall 1, and both sides of the outer edge part 11 protrude from the inner and outer sides of the guide wall 1 respectively. The outer edge part 11 is used to provide guiding and positioning functions for the subsequent ramming device.

[0034] Specifically, the slag backfilling operation includes covering the backfill layer surface to form a slag layer. The slag such as blast - furnace slag and steel slag is used to provide good water permeability and bearing capacity; the leveling tools such as scrapers and bulldozers are used to level the surface of the slag layer. The cooperation relationship between the slag and the leveling tools is realized through the layered backfilling and compaction method. For example, the thickness of each backfill layer is controlled within 0.3m to ensure the uniform distribution of the slag layer.

[0035] Specifically, the overall compaction operation includes comprehensively compacting the slag. The overall compaction includes rollers and vibratory rollers. Rollers such as tandem rollers and pneumatic-tyred rollers are used for large-area compaction of the slag layer; vibratory rollers such as single-drum vibratory rollers and double-drum vibratory rollers are used to enhance the compaction effect. The cooperation relationship between the rollers and the vibratory rollers is achieved through the construction sequence. For example, first use a tandem roller for primary compaction, then use a single-drum vibratory roller for secondary compaction, and finally use a pneumatic-tyred roller for final compaction to ensure that the compaction degree of the slag layer meets the design requirements.

[0036] Since equipment such as rollers needs to maintain a safe distance from the guide wall 1 and cannot cover the compaction work at the inner side position of the guide wall 1, local ramming is required.

[0037] Refer to Figure 1 and Figure 2 As shown in [relevant figure] and [relevant figure], the local ramming operation includes ramming the slag at the position adjacent to the inner side of the guide wall 1. The ramming device includes a machine base 21, traveling wheels 24, limiting arms 23, limiting wheels 4, a driving member 25, a working arm 3, and a ramming assembly 6. The machine base 21 is made of high-strength steel and has sufficient load-bearing capacity and stability; the traveling wheels 24 are made of rubber material, which can adapt to different ground conditions and reduce damage to the top of the guide wall 1. The limiting arms 23 are of steel frame structure, with a wear-resistant layer provided on the inner side. The driving member 25 controls the two limiting arms 23 to approach or move away from each other to adapt to the transverse width of the outer edge portion 11, and by abutting against both sides of the outer edge portion 11, the machine base 21 is centered to ensure the accurate positioning of the ramming device. Among them, the driving member 25 uses two transverse cylinders and is installed in the machine base 21. The two transverse cylinders correspond to the two limiting arms 23 one by one. The piston rod of the transverse cylinder extends out of the side of the machine base 21 and is fixedly connected to the corresponding limiting arm 23. The transverse movement of the limiting arm 23 is achieved through the telescoping of the transverse cylinder. In addition, guide rods 22 are fixed on both sides of the machine base 21, and the guide rods 22 penetrate through the limiting arms 23 along the direction of the transverse cylinder to improve the stability of the limiting arms 23. In the step of positioning the ramming device, the machine base 21 is placed on the top of the guide wall 1, and the traveling function is achieved through the traveling wheels 24, and the traveling wheels 24 are driven by a motor 61. By starting the driving member 25, the two limiting arms 23 are made to approach each other until the inner sides of the two limiting arms 23 respectively abut against both sides of the outer edge portion 11.

[0038] The limit wheel 4 is made of wear-resistant material and is installed on the inner side of the lower end of the limit arm 23, and can run smoothly at the bottom position of the outer edge portion 11. In this embodiment, a lifting assembly 26 for driving the limit wheel 4 to lift is embedded in the limit arm 23. The lifting assembly 26 is specifically a vertical cylinder. The piston rod of the vertical cylinder is arranged downward and fixedly connected to the mounting seat of the limit wheel 4. In the positioning step of the ramming device, by starting the lifting assembly 26, the limit wheel 4 is abutted against the bottom position of the outer edge portion 11, so that the limit wheel 4 can roll along the bottom wall position of the outer edge portion 11, further improving the moving stability of the ramming device.

[0039] Referring to Figure 1 and Figure 3 , the working arm 3 is fixedly installed on the outer side of one of the limit arms 23, and an adjusting mechanism 5 is installed at the lower end of the limit arm 23. Specifically, the adjusting mechanism 5 includes a sliding sleeve 52 vertically sleeved on the outer periphery of the working arm 3 and a sliding seat 51 horizontally penetrating through the sliding sleeve 52. The ramming assembly 6 is installed at the sliding seat 51. Among them, the working arm 3 is provided with a plurality of horizontally threaded holes 32 vertically and equally spaced. A transverse bolt is arranged through the sliding sleeve 52 along the axial direction of the horizontally threaded hole 32. By fixing the transverse bolt to the horizontally threaded holes 32 at different positions, the height adjustment of the sliding sleeve 52 is realized, and then the vertical adjustment of the ramming assembly 6 is realized. In addition, the working arm 3 is provided with a through groove 31 for the sliding seat 51 to pass through, and the through groove 31 extends vertically. The sliding seat 51 is provided with a plurality of vertical threaded holes in its own length direction. A vertical bolt 53 is arranged through the sliding seat 51 along the axial direction of the vertical threaded hole. By fixing the vertical bolt 53 to the vertical threaded holes at different positions, the horizontal adjustment of the sliding sleeve 52 is realized, and then the horizontal adjustment of the ramming assembly 6 is realized. The position of the ramming assembly 6 can be adjusted according to the construction requirements. The ramming assembly 6 adopts an impact type or a vibration type design and can effectively compact the slag layer near the inner side of the guide wall 1. In the slag backfilling step, the method of layered backfilling and compaction is adopted. And in the ramming step of the ramming device, by horizontally moving the adjusting mechanism 5, the horizontal position of the ramming assembly 6 is adjusted so that the ramming assembly 6 is attached to the inner wall of the guide wall 1. Then, according to the height position of the slag surface in the case of layered backfilling, the vertical position of the ramming assembly 6 is adjusted by using the adjusting mechanism 5.

[0040] Specifically, the ramming component 6 includes a mounting frame 62 installed at the end of the sliding seat 51, a cam 63 rotatably connected within the mounting frame 62, a push rod 64 vertically penetrating the sliding seat 51, a hammer body 65 fixed to the lower end of the push rod 64, and an electric motor 61 for driving the cam 63 to rotate. The electric motor 61 is installed at the mounting frame 62 and its output shaft is coaxially fixed to the cam 63. The rotation axis of the cam 63 is horizontally arranged and perpendicular to the sliding seat 51. An annular groove is formed on the outer peripheral surface of the cam 63, and the annular groove extends along the contour of the cam 63. The groove profile of the annular groove is T-shaped. A T-shaped block slidably connected to the annular groove is fixed to the top of the push rod 64. Under the drive of the electric motor 61 and the linkage between the cam 63 and the push rod 64, the hammer body 65 moves up and down to hammer the surface of the slag layer, achieving the purpose of ramming.

[0041] To reduce the friction between the hammer body 65 and the inner wall of the guide wall 1, a plurality of pulleys 66 are installed on the side of the hammer body 65 facing the guide wall 1. When hammering the slag layer, the pulleys 66 always closely adhere to the guide wall 1.

[0042] The operation of backfilling with cement stone powder includes backfilling cement stone powder on the slag layer to form a cement stone powder layer, and then leveling and compressing it. The cement stone powder layer at the inner side of the guide wall 1 is also locally rammed by the ramming device in S5. The cement stone powder is composed of cement and stone powder mixed in a certain proportion, and has good adhesiveness and impermeability; compaction equipment such as a plate vibrator and a small roller is used to level and compact the cement stone powder layer. The cooperation relationship between the cement stone powder and the compaction equipment is achieved through a layered backfilling method. For example, the thickness of each backfilled layer is controlled within 0.2 m to ensure that the cement stone powder layer is evenly distributed and reaches the designed compaction degree.

[0043] The implementation principle of this embodiment is as follows: By adopting the method of layered backfilling and compaction for foundation backfilling, it is ensured that the backfilled soil layer is uniform and dense; by adopting the method of staggering joints up and down and building inside and outside for the masonry of the guide wall 1, the structural stability of the guide wall 1 is enhanced; by adopting the method of layered backfilling and compaction for slag backfilling, good water permeability and bearing capacity are provided; by adopting a multi-stage compaction method to compact the slag layer as a whole, it is ensured that the compaction degree of the slag layer meets the design requirements; by adopting a ramming device to locally ram the slag layer near the inner side of the guide wall 1, the problem that traditional compaction equipment is difficult to effectively operate is solved; by adopting the method of layered backfilling and compaction for cement stone powder backfilling, the overall stability of the backfilled layer is enhanced. This embodiment not only improves the ramming effect of the slag backfilled near the inner side of the guide wall 1, but also significantly improves the overall backfilling construction quality and efficiency, creating favorable conditions for subsequent construction.

[0044] Embodiment 2 The difference between this embodiment and the above-mentioned embodiment lies in that: in the operation of backfilling with slag, the construction is carried out by the method of layered backfilling of slag and gravel mixture. Specifically, the slag and gravel mixture is mixed in a certain proportion. For example, the proportion of slag is 70% and the proportion of gravel is 30%. The mixture is prepared by mechanical stirring to ensure uniform mixing. During the layered backfilling process, the thickness of each backfilled layer is controlled within 0.3 m. A plate vibrator is used for preliminary compaction, and then a small roller is used for re-compaction to ensure that the mixture layer is uniformly dense. In addition, in the local compaction operation, the tamping component 6 adopts a design combining impact type and vibration type, which can meet the compaction requirements of different types of slag layers at the same time. In the operation of backfilling with cement stone powder, the construction is carried out by the method of layered backfilling of cement stone powder and fine sand mixture. Specifically, the cement stone powder and fine sand are mixed in a certain proportion. For example, the proportion of cement stone powder is 60% and the proportion of fine sand is 40%. The mixture is prepared by mechanical stirring to ensure uniform mixing. During the layered backfilling process, the thickness of each backfilled layer is controlled within 0.2 m. A plate vibrator is used for preliminary compaction, and then a small roller is used for re-compaction to ensure that the mixture layer is uniformly dense.

[0045] The implementation principle of this embodiment is as follows: By adopting the method of layered backfilling of slag and gravel mixture for construction, the overall stability of the slag layer is enhanced; by adopting the design of the tamping component 6 combining impact type and vibration type, the local compaction effect is improved; by adopting the method of layered backfilling of cement stone powder and fine sand mixture for construction, the overall stability of the cement stone powder layer is enhanced. This embodiment not only improves the construction quality of the slag layer and the cement stone powder layer, but also significantly improves the overall backfilling construction efficiency, creating more favorable conditions for subsequent construction.

[0046] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A construction method for compaction of foundation backfill at the first floor of a building, characterized in that, The following steps are involved: S1: Backfilling of the first floor foundation of the building: laying backfill soil in the foundation pit and compacting it layer by layer to form a backfill layer; S2: Construction of foundation beam guide wall (1): Construction of the guide wall (1) on the foundation beam, wherein the guide wall (1) extends along the direction of the foundation beam; S3: slag backfill: covering the surface of the backfill layer with slag to form a slag layer, and the slag is blocked on the inner side of the guide wall (1); S4: Overall compaction: the slag is fully compacted; S5: Local compaction: When compacting the slag at the inner side of the adjacent guide wall (1), a tamping device is first installed on the top of the guide wall (1). The tamping device is closely attached to the inner side of the guide wall (1) and compacts the slag at the inner side of the adjacent guide wall (1) in a vertical downward direction. The tamping device is moved along the extension direction of the guide wall (1) to complete the slag compaction step at the inner side of the guide wall (1).

2. The construction method for ramming and compacting the backfill of the first - floor foundation of a building according to claim 1, characterized in that: In the above S2, the guide wall (1) is built by staggering the upper and lower joints and building the inside and outside together, and an outer edge portion (11) is built on the top of the guide wall (1), and the two sides of the outer edge portion (11) protrude from the inner and outer sides of the guide wall (1) respectively. In the above S5, the tamping device is engaged with the outer edge portion (11), and the tamping device moves along the extension direction of the guide wall (1) under the guidance of the outer edge portion (11).

3. The construction method for ramming and compacting the foundation backfill of the first floor of a building according to claim 1, characterized in that: In S5, the surface of the slag layer is leveled and the entire layer is compacted using a roller.

4. The construction method for ramming and backfilling the foundation of the first floor of a building according to claim 2, characterized in that: In the S5, the tamping device comprises a moving body (2) that is slidably matched with the outer edge (11), a working arm (3) that is arranged on one side of the moving body (2) and extends downward, and a tamping assembly (6) that is arranged at the lower end of the working arm (3). When performing the local tamping step of the S5, the moving body (2) is installed on the top of the guide wall (1) and is slidably matched with the outer edge (11), the working arm (3) is close to the inner side of the guide wall (1), and the tamping assembly (6) is attached to the inner wall of the guide wall (1) to tamp the slag layer downward.

5. The construction method for ramming and compacting the backfill of the first-floor foundation of a building according to claim 4, characterized in that: The mobile body (2) comprises a machine base (21), a running wheel (24) arranged at the bottom of the machine base (21), and two limiting arms (23) respectively arranged on both sides of the machine base (21); the limiting arms (23) extend downwardly, and limiting wheels (4) are arranged at the inner sides of the lower ends of the two limiting arms (23); a driving member (25) is arranged in the machine base (21) for driving the two limiting arms (23) to move closer to or farther from each other; in the step of placing the tamping device in S5, the machine base (21) is placed on the top of the guide wall (1), and the moving function is realized by the running wheel (24); by starting the driving member (25), the two limiting arms (23) are moved closer to each other until the inner sides of the two limiting arms (23) respectively abut against the two sides of the outer edge (11); when the tamping device moves, the two limiting wheels (4) travel at the bottom of the outer edge (11).

6. The construction method for ramming and compacting the backfill of the first-floor foundation of a building according to claim 5, characterized in that: The limiting arm (23) is provided with a lifting assembly (26) for driving the limiting wheel (4) to rise and fall. In the step of placing the tamping device in S5, the lifting assembly (26) is started to make the limiting wheel (4) reach the bottom position of the outer edge portion (11).

7. The construction method for ramming and compacting the backfill of the first-floor foundation of a building according to claim 4, characterized in that: The working arm (3) is arranged outside one of the limiting arms (23), and an adjusting mechanism (5) for adjusting the horizontal and vertical positions of the tamping component (6) is arranged at the lower end of the working arm (3); in the slag backfilling step of S3, the layered backfilling and compaction method is adopted. In the tamping step of the tamping device in S5, the horizontal position of the tamping component (6) is adjusted by horizontally moving the adjusting mechanism (5) to make the tamping component (6) adhere to the inner wall of the guide wall (1), and then the vertical position of the tamping component (6) is adjusted by using the adjusting mechanism (5) according to the height position of the slag surface under the condition of layered backfilling.

8. The construction method for ramming and compacting the backfill of the first-floor foundation of a building according to claim 1, characterized in that: It further includes S6: Cement stone powder is backfilled on the slag layer to form a cement stone powder layer, and then leveling and compaction are carried out. The cement stone powder layer at the inner side of the guide wall (1) is also locally tamped by using the tamping device in S5.

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