Secondary grouting method and device for equipment base

Abstract

The invention discloses a method and device for secondary grouting of an equipment base, belongs to the technical field of equipment installation, and is mainly used for installation of large equipment bases. According to the secondary grouting method and device for the equipment base, a secondary grouting layer is subjected to grouting area division, a plurality of grouting steel pipes are arranged in each grouting area, it is guaranteed that at least two grouting steel pipe outlets are formed in each grouting area, and the grouting efficiency is improved. Grouting is conducted in sequence from far to near according to the distance between the grouting areas and the grouting end, the slurry in the next area can extrude the slurry in the grouting area and fill a gap in the previous area, and the slurry in the last area is extruded and exhausted through the sealing formwork, so that the slurry completely fills a secondary grouting layer; a high-quality gapless secondary grouting layer is obtained; vibration exhaust is not needed in the grouting process, and the installation precision of the equipment base is guaranteed; the grouting steel pipe does not need to be dismantled after grouting is completed, the reinforcement effect is achieved, and the bearing capacity of the secondary grouting layer is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of equipment installation, in particular to a method and a device for secondary grouting of a large equipment base. Background Art

[0002] In order to facilitate the installation and adjustment of the equipment and eliminate the impact caused by the uneven surface of the poured concrete foundation and the manufacturing error of the equipment base itself, a secondary grouting layer is usually set between the equipment base and the concrete foundation. After the equipment is leveled and aligned by the shims arranged in advance between the equipment base and the concrete foundation, the equipment base is fixed by the bolts embedded in the concrete foundation, and then concrete is poured into the reserved secondary grouting layer to fill the space between the equipment base and the concrete foundation with concrete, so that the weight of the equipment itself and the dynamic load it bears are evenly transferred to the concrete foundation.

[0003] For general medium and small equipment, the secondary grouting layer area is not large, and fine stone concrete is usually used. If the equipment base exceeds a certain size, self-compacting grouting materials with good fluidity can be used, combined with vibration or boosting methods to obtain a higher quality secondary grouting layer.

[0004] However, for large equipment, the secondary grouting layer formed between the large-area equipment base and the concrete foundation exceeds 100m 2 (For example: the cooler base size of the XX aero engine test device is: 22m (L) × 11.6 (W) × 1.2 / 0.8 (H), the base weight is 300t, the upper installed equipment weighs 1700t, and its base area is 255㎡). Due to the large size, the middle of the base is too far away from the operable grouting port. If the above conventional method is used for grouting, the grouting material cannot fill the secondary grouting layer by self-flow. Since the height of the secondary grouting layer is small and the distance is long, a vibration pump is used to vibrate and promote the flow of the grouting material. The vibration promotion cannot or is difficult to operate, and the excessive vibration will affect the installation accuracy of the equipment base. For large-area grouting of the secondary grouting layer, whether it is a single or multiple directions of simultaneous grouting, through complete self-flow or vibration or boosting, due to the small operating space and long distance, cavities are easily formed in the grouting layer, affecting the pouring quality of the secondary grouting layer. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a secondary grouting method and a grouting structure for an equipment base, which are mainly used for secondary grouting of an ultra-large area equipment base to achieve the purpose of good grouting quality and high grouting efficiency.

[0006] The present invention discloses a secondary grouting method for an equipment base, wherein the secondary grouting layer is a cavity between the equipment base and a concrete foundation, the length direction of the secondary grouting layer is a grouting direction, one end of the length direction of the secondary grouting layer is a grouting end, and the end opposite to the grouting end is a distal end, comprising the following steps:

[0007] Dividing the grouting area, dividing the secondary grouting layer into a plurality of grouting areas connected in sequence along the grouting direction of the secondary grouting layer;

[0008] Laying out grouting steel pipes, arranging a plurality of grouting steel pipes spaced apart in the width direction of the secondary grouting layer in each grouting area, wherein the outlet of the grouting steel pipe is located in the grouting area, and the inlet extends to the outside of the grouting end;

[0009] Install the closed formwork on the outside of the secondary grouting layer;

[0010] Grouting: Grouting is carried out from far to near in the secondary grouting layer through the grouting steel pipe according to the distance between the grouting area and the grouting end, until the grouting of the grouting area closest to the grouting end is completed, and then the grouting is stopped;

[0011] Remove the closed formwork after the hardening strength of the slurry in the secondary grouting layer reaches the requirement.

[0012] Preferably, the step further comprises roughening the concrete foundation before laying the grouting steel pipe.

[0013] Preferably, the grouting steel pipe is laid out before the equipment base is installed.

[0014] Preferably, an overflow bucket is provided at the grouting end of the secondary grouting layer, the height of the overflow bucket is greater than the height of the secondary grouting layer and the opening is facing upward, and whether the grouting is completed is judged by observing the height of the slurry overflowing into the overflow bucket. When the slurry overflowing into the overflow bucket is higher than the secondary grouting layer, the grouting is completed and the grouting is stopped.

[0015] Preferably, the diameter of the grouting steel pipe is DN25-DN40.

[0016] Preferably, the grouting steel pipe outlets in different grouting areas are arranged in a staggered manner.

[0017] As a specific implementation method, a grouting area is divided every 2m along the length direction of the concrete foundation, the horizontal layout spacing of adjacent grouting steel pipe outlets in the same grouting area is 2m, and the vertical layout spacing of grouting steel pipe outlets in adjacent grouting areas is 2m.

[0018] Preferably, the grouting steel pipe is fixed to the concrete foundation by expansion bolts, and the expansion bolts are arranged at intervals along the length direction of the grouting steel pipe, and the arrangement spacing of the expansion bolts is 1-1.5m.

[0019] The present invention also discloses a grouting steel pipe arrangement structure for a grouting method of a secondary grouting layer of an equipment base as described above, wherein the secondary grouting layer is a cavity between the equipment base and a concrete foundation, the length direction of the secondary grouting layer is a grouting direction, one end of the secondary grouting layer in the length direction is a grouting end, and the end opposite to the grouting end is a distal end, the secondary grouting layer is divided into a plurality of grouting areas connected in sequence along the grouting direction, a plurality of grouting steel pipes are arranged at intervals in each grouting area along the width direction of the secondary grouting layer, the outlet of the grouting steel pipe is located in the grouting area, and the inlet extends outside the grouting end.

[0020] Preferably, the division interval of the grouting area is 2m, the horizontal arrangement interval of adjacent grouting steel pipe outlets in the same grouting area is 2m, and the vertical arrangement interval of grouting steel pipe outlets in adjacent grouting areas is 2m.

[0021] The beneficial effects of the present invention are as follows: the secondary grouting layer formed between the super-large equipment base and the concrete foundation is divided into grouting areas, a plurality of grouting steel pipes are arranged in each grouting area, and it is ensured that there are at least two grouting steel pipe outlets in each grouting area, and grouting is performed in sequence from far to near in the order of the distance between the grouting areas and the grouting end, and the slurry in the next area will squeeze the slurry in the previous completed grouting area, fill the unfilled gap in the previous area and exhaust the gas, and the slurry in the last area is squeezed and exhausted by the closed template provided, so that the slurry completely fills the secondary grouting layer, and the grouting quality of each grouting area is ensured to ensure the grouting quality of the entire secondary grouting layer, so as to obtain a high-quality and gapless secondary grouting layer; at the same time, no oscillation and exhaust are required during the grouting process, so as to ensure the installation accuracy of the equipment base; and the grouting steel pipe is left in the secondary grouting layer after the grouting is completed, which can play a role of reinforcement and enhance the bearing capacity of the secondary grouting layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 : Layout diagram of grouting steel pipes for secondary grouting of the present invention;

[0023] Figure 2 : Figure 1 Middle AA section view;

[0024] Figure 3 : Grouting area division diagram of the present invention.

[0025] Figure numerals: 1-concrete foundation; 2-grouting steel pipe; 21-extra-long grouting steel pipe; 22-long grouting steel pipe; 23-medium grouting steel pipe; 24-shorter grouting steel pipe; 25-short grouting steel pipe; 3-equipment base; 4-secondary grouting layer; 5-shim; 6-closed formwork; 7-overflow bucket; 8-expansion bolt; 9-grouting equipment; 91-grouting hose; 10-shear rod; 11-anchor bolt. DETAILED DESCRIPTION

[0026] The present invention is further described below.

[0027] The present invention provides a grouting method for a secondary grouting layer of an equipment base, which is mainly used for secondary grouting of an ultra-large-area equipment base. The secondary grouting layer 4 is a cavity between the equipment base 3 and a concrete foundation. The length direction of the secondary grouting layer 4 is a grouting direction. A section of the length direction of the secondary grouting layer 4 is a grouting section, and an end opposite to the grouting end is a distal end, comprising the following steps:

[0028] Step 1: Divide the grouting area, and divide the secondary grouting layer 4 into a plurality of strip grouting areas along the grouting direction of the secondary grouting layer 4;

[0029] like Figure 3 As shown, the secondary grouting layer 4 is divided into five grouting areas along the grouting direction of the secondary grouting layer 4, namely the farthest grouting area ①, the second farthest grouting area ②, the middle grouting area ③, the closer grouting area ④ and the closest grouting area ⑤, so as to facilitate the subsequent grouting in sequence in different areas. The grouting quality of the entire secondary grouting layer 4 is guaranteed by ensuring the grouting quality of each grouting area. The width of each grouting area is mainly selected according to the fluidity of the slurry itself, the diameter of the grouting steel pipe and the height of the secondary grouting layer. The height of the secondary grouting layer and the fluidity of the slurry itself determine how large the flow area of ​​the slurry flowing out of the grouting steel pipe outlet can be with the grouting steel pipe outlet as the center. The grouting area is divided according to the diameter of the flow range to ensure that each grouting area can be fully grouted, which can be obtained through experiments.

[0030] Step 2: Laying out the grouting steel pipes 2, in each grouting area, arranging a plurality of grouting steel pipes 2 spaced apart along the width direction of the secondary grouting layer 4, wherein the outlet of the grouting steel pipe 2 is located in the grouting area, and the inlet extends to the outside of the grouting end;

[0031] By providing a plurality of grouting steel pipes 2 spaced apart along the width direction of the secondary grouting layer 4 in each grouting area, at least two grouting steel pipe 2 outlets are provided in each grouting area for subsequent grouting, so as to realize the grouting of the secondary grouting layer 4 in different areas, so as to facilitate the grouting filling the entire secondary grouting layer 4; since it is required that a grouting steel pipe 2 outlet is provided in each grouting area, the length of the grouting steel pipe 2 is different, and its specific length can be selected according to the distance between the grouting area and the grouting end, such as Figure 1 , Figure 3As shown, the grouting steel pipe 2 includes an extra-long grouting steel pipe 21, a long grouting steel pipe 22, a medium grouting steel pipe 23, a shorter grouting steel pipe 24 and a short grouting steel pipe 25, which are respectively arranged in the grouting areas for grouting; it should be noted that the grouting ranges of the grouting steel pipes 2 in different grouting areas overlap a little, and the outlets of the grouting steel pipes 2 in each grouting area can be slightly offset from the center line of the grouting area close to the far end of the secondary grouting layer 4 to ensure that the front end of each grouting area is completely filled, and the last grouting area can be squeezed through the closed template 6.

[0032] Step 3: Install the closed formwork 6, and install the closed formwork 6 on the outside of the secondary grouting layer 4;

[0033] A closed template 6 is installed outside the secondary grouting layer 4, and an inlet of the grouting steel pipe 2 is reserved for grouting to prevent the slurry from directly flowing out from the edge of the secondary grouting layer 4 during the grouting process and failing to fill the secondary grouting layer 4.

[0034] Step 4: Grouting: Grouting is performed from far to near through the grouting steel pipe 2 to the secondary grouting layer 4 according to the distance between the grouting area and the grouting end, until the grouting of the grouting area closest to the grouting end is completed, and then the grouting is stopped;

[0035] like Figure 1 , Figure 3 As shown, the grouting steel pipe 2 is connected to the grouting equipment 9 through the grouting hose 91 for grouting. The grouting hose 91 has a certain flexibility and can be appropriately bent to facilitate the grouting steel pipe 2 at various positions. According to the distance between the grouting area and the grouting end, grouting is performed from far to near in sequence, as shown in the attached Figure 3As shown, the entire secondary grouting layer is divided into five areas, namely, the farthest grouting area ①, the secondary farthest grouting area ②, the middle grouting area ③, the closer grouting area ④ and the closest grouting area ⑤; the grouting steel pipe 2 corresponding to each grouting area is specifically an extra-long grouting steel pipe 21, a long grouting steel pipe 22, a medium grouting steel pipe 23, a shorter grouting steel pipe 24 and a short grouting steel pipe 25; first, the farthest grouting area ① farthest from the grouting end is grouted by the extra-long grouting steel pipe 21, and then the secondary farthest grouting area ② is grouted by the long grouting steel pipe 22. At this time, the slurry in the secondary farthest grouting area ② will squeeze the slurry in the farthest grouting area ①, filling the gap that has not been filled with the slurry in the farthest grouting area ①. The grouting of the most distal grouting area ① and the nearest grouting area ④ is the same as that of the most distal grouting area ① and the second most distal grouting area ②; the grouting of the nearest grouting area ⑤ is judged by the degree of slurry overflowing the closed template 6, and the grouting is stopped when the slurry overflows too much.

[0036] Regarding whether the grouting volume of the above-mentioned farthest grouting area ①, the second farthest grouting area ②, the middle grouting area ③, the closer grouting area ④ and the nearest grouting area ⑤ has filled each area, it can be judged specifically through calculation and observation. For example, for the farthest grouting area ①, the second farthest grouting area ②, the middle grouting area ③ and the closer grouting area ④, according to the outlet position of the grouting steel pipe 2 set in the secondary grouting layer 4, the grouting range required to be completed at the outlet of each grouting steel pipe 2 is divided, and the volume of slurry required within the grouting range is calculated. Combined with the grouting speed of the grouting equipment 9 and the flow rate of the slurry in the grouting steel pipe 2, the corresponding grouting time is calculated, and the filling degree of the grouting material is judged according to the grouting time; secondly, since the grouting is from far to near, as described above, the slurry in the next area will squeeze the slurry in the previous area. , fill the unfilled gap in the previous area, and the last area is squeezed and exhausted by the closed template 6. When the slurry overflows the closed template 6, the slurry completely fills the secondary grouting layer 4. In addition, since there is no need to grout different areas by changing the length of the grouting steel pipe 2, there will be no problem of gaps in the area that need to be filled again after the grouting steel pipe 2 is pulled out from the grouting completed area. At the same time, leaving the grouting steel pipe 2 in the secondary grouting layer 4 can also play a reinforcement role, enhance the load-bearing capacity of the secondary grouting layer 4, and avoid cracking due to excessive force.

[0037] Step 5: Remove the closed formwork 6. After the hardening strength of the slurry in the secondary grouting layer 4 reaches the requirement, remove the closed formwork 6.

[0038] After grouting is completed, the grouting equipment 9 connected to the grouting steel pipe 2 is first removed, and after the grouting material in the secondary grouting layer 4 hardens and reaches 75% strength (the strength requirement is selected according to the specific construction requirements), the outer closed template 6 is removed, and the excess grouting material outside the secondary grouting layer 4 is chiseled out, and the grouting steel pipe 2 protruding from the edge of the concrete foundation 1 is cut and removed, and finally the edge of the concrete foundation 1 is smoothed and finished with cement slurry. The hardening degree of the above grouting material can be judged by the reserved sample. When the reserved sample reaches this strength, the slurry in the secondary grouting layer 4 also reaches this strength.

[0039] In order to enhance the bonding strength between the secondary grouting layer 4 and the concrete foundation 1, the concrete foundation 1 is roughened before the grouting steel pipe 2 is laid, that is, the surface of the poured concrete foundation 1 is roughened and cleaned, the floating layer on the surface of the concrete foundation 1 is chiseled off, and the garbage and dust on the surface are cleaned.

[0040] In order to facilitate the calculation and control of the grouting volume of each area and ensure the grouting quality of the secondary grouting layer 4, the grouting steel pipe 2 is laid out before the equipment base 3 is installed; if the equipment base 3 is installed first, when the grouting steel pipe 2 is installed, the position of the outlet of the grouting steel pipe 2 cannot be accurately known, and it is not convenient to fix the grouting steel pipe 2. There are errors in the calculation of the volume of grouting slurry required for the grouting, and it is impossible to determine whether each grouting area is completely filled with slurry, which reduces the grouting quality.

[0041] To ensure that the grouting area closest to the grouting end of the secondary grouting layer 4 (such as Figure 3The grouting quality of the nearest grouting area ⑤) in the middle is checked, and it is also convenient to observe and judge whether the secondary grouting layer 4 is filled. An overflow hopper 7 is also provided outside the grouting end of the secondary grouting layer 4. The height of the overflow hopper 7 is greater than the height of the secondary grouting layer 4 and the opening is facing upward. The grouting is judged by observing the height of the slurry overflowing into the overflow hopper. When the slurry overflowing into the overflow hopper 7 is higher than the upper surface of the secondary grouting layer 4, the grouting is completed and the grouting is stopped. After the hardening strength of the slurry reaches the requirement, the overflow hopper 7 and the closed template 6 are removed together. The slurry in the last area is filled by the slurry overflowing from the overflow hopper 7. The slurry is squeezed and exhausted so that the slurry completely fills the secondary grouting layer 4 to ensure its grouting quality. At the same time, the grouting degree of the nearest area ⑤ and the grouting degree of the entire secondary grouting layer 4 can be judged by the amount of slurry overflowing into the overflow bucket 7 (the height of the slurry overflowing into the overflow bucket 7). Specifically, when the slurry overflowing into the overflow bucket 7 is 100 mm higher than the upper surface of the secondary grouting layer 4, the grouting is completed. After the grouting material in the secondary grouting layer 4 hardens and reaches 75% of the strength, the overflow bucket 7 together with the closed formwork 6 is removed, and the hardened slurry in the overflow bucket 7 is chiseled out.

[0042] In order to ensure the fluidity of the slurry inside the grouting steel pipe 2 and enable the slurry to be smoothly poured into the designated area, the diameter of the grouting steel pipe 2 is DN25-DN40. A diameter that is too large will affect the installation of the equipment base 3, making it unable to meet the designed horizontality and elevation. A diameter that is too small will be inconvenient for the flow of slurry. The thickness of the pipe wall is to ensure that the grouting steel pipe 2 will not break due to the grouting pressure. At the same time, it is buried after the secondary grouting layer 4 to play a reinforcement role, enhance the bearing capacity of the secondary grouting layer 4, and avoid cracking due to excessive force.

[0043] In order to avoid that the outlets of the grouting steel pipes 2 in different grouting areas are located on the same horizontal line, resulting in uneven grouting, the outlets of the grouting steel pipes 2 in different grouting areas are arranged in a staggered manner; Figure 3 As shown, no matter which two different grouting areas the grouting steel pipes 2 are located in, the outlet connection line forms a certain angle with the grouting direction of the secondary grouting layer 4, so that they are staggered to avoid the grouting steel pipes 2 in different grouting areas being located on the same horizontal line, resulting in uneven grouting.

[0044] In order to ensure that the grouting area of ​​each grouting steel pipe 2 is of the same size and each grouting area can be effectively filled, a grouting area is divided every 2m along the grouting direction of the secondary grouting layer 4, and the horizontal layout spacing a of the outlets of adjacent grouting steel pipes 2 located in the same grouting area is 2m, and the vertical layout spacing b of the outlets of the grouting steel pipes 2 located in adjacent grouting areas is 2m; Figure 1 , Figure 3As shown, a grouting area is divided every 2m along the grouting direction of the secondary grouting layer 4, and it is specifically divided into five areas: the farthest area ①, the second farthest area ②, the middle area ③, the closer area ④ and the closest area ⑤. The grouting steel pipe 2 can be divided into an extra-long grouting steel pipe 21, a long grouting steel pipe 22, a medium grouting steel pipe 23, a shorter grouting steel pipe 24 and a short grouting steel pipe 25 according to its length. The horizontal layout spacing c between two adjacent grouting steel pipes is 0.4m; combined with Figure 3 Taking the secondary distal region ② as an example, it can be seen that four long grouting steel pipes 22 are arranged in the secondary distal region ②, and the horizontal layout spacing a between the outlets of two adjacent long grouting steel pipes 22 is 2m. The medium grouting steel pipe 23 in the middle region ③ and the shorter grouting steel pipe 24 in the closer region ④ are adjacent to the long grouting steel pipe 22, and the vertical layout spacing b between the outlet of the medium grouting steel pipe 23 and the outlet of the long grouting steel pipe 22, and between the outlet of the shorter grouting steel pipe 24 and the outlet of the long grouting steel pipe 22 is 2m; further There is an outlet of a grouting steel pipe 2 every 2m of the secondary grouting layer 4. The grouting steel pipes 2 are arranged in this way to ensure the effective grouting range of each grouting steel pipe 2. If the planned grouting range is too large, the slurry fluidity is insufficient and the grouting area cannot be completely filled. If the planned grouting range is too small, the required amount of grouting steel pipes 2 increases and the cost increases. In addition, this arrangement can also calculate the required amount of slurry according to the specific size of the grouting area, which is convenient for controlling the grouting time and ensuring the grouting quality.

[0045] In order to ensure that the position of the grouting steel pipe 2 will not change due to excessive grouting pressure during the grouting process, the grouting steel pipe 2 is fixed to the concrete foundation 1 by expansion bolts 8. The expansion bolts 8 are arranged at intervals along the length direction of the grouting steel pipe 2, and the layout spacing of the expansion bolts 8 is 1-1.5m; if the spacing is too small, more expansion bolts 8 are required, and the cost is higher; if the spacing is too large, the fixing effect is not good.

[0046] Combination Figures 1 to 3 The following specific examples are given for reference.

[0047] Preparation work before grouting: After the construction of the concrete foundation 1 for equipment installation is completed, the upper surface of the concrete foundation 1 is roughened and cleaned; after completion, since the secondary grouting layer 4 is the cavity formed by the concrete foundation 1 and the equipment base 3, the area of ​​the concrete foundation 1 is the grouting area of ​​the secondary grouting layer 4, and a strip grouting area will be divided every 2m along the grouting direction of the secondary grouting layer 4, that is, Figure 3As shown, it is divided into the farthest area ①, the second farthest area ②, the middle area ③, the closer area ④ and the closest area ⑤. Four grouting steel pipes 2 are arranged in each grouting area. The types of grouting steel pipes 2 in each grouting area are respectively extra-long grouting steel pipes 21, long grouting steel pipes 22, medium grouting steel pipes 23, shorter grouting steel pipes 24 and short grouting steel pipes 25; the horizontal layout spacing c between two adjacent grouting steel pipes 2 is 0.4m, and the horizontal layout spacing a of adjacent grouting steel pipes 2 whose outlets are located in the same grouting area is 2m, the outlet of the grouting steel pipe 2 is located in the adjacent grouting area, and the vertical arrangement spacing b of the grouting steel pipe 2 is 2m; the above-mentioned setting of the grouting steel pipe 2 ensures that the outlet is evenly distributed, and satisfies that there is an outlet of the grouting steel pipe 2 within every 2m of the secondary grouting layer 4; the diameter of the grouting steel pipe 2 is DN25-DN40, and the wall thickness is not less than 1mm. The grouting steel pipe 2 can be prefabricated according to the shape of the base. The inlet end of the grouting steel pipe 2 needs to be led to the outside of the grouting end of the secondary grouting layer 4, and the grouting steel pipe 2 is fixed to the concrete with expansion bolts 8 at intervals of 1m-1.5m. The equipment base 3 is then installed and fixed to the top of the concrete foundation 1 through the anchor bolts 11 and the shear rods 10. In addition to being used to install the equipment base 3 and provide fastening support for the equipment base 3, the shear rods 10 and the anchor bolts 11 can also provide shear resistance and stabilize the equipment base after the secondary grouting layer 4 is grouted. After the equipment base 3 is installed, the thickness of the shims 5 set at the four corner points of the equipment base 3 is adjusted to level and align the equipment base 3, so that the installed equipment reaches the designed horizontality and elevation, ensuring that the equipment base The installation accuracy of the seat 3; at the same time, the shim 5 can transfer the weight of the equipment to the foundation, which can increase the stability of the equipment to facilitate secondary grouting; the cavity formed between the equipment base 3 and the concrete foundation 1 is the secondary grouting layer 4, and a closed template 6 is installed on the outside of the secondary grouting layer 4, and an overflow bucket 7 is installed outside the grouting end of the secondary grouting layer 4, and a grouting hose 91 is used to connect the inlet of the grouting steel pipe 2 to the grouting equipment 9 for grouting. The grouting equipment 9 can adopt a plunger high-pressure grouting pump, a screw grouting pump, an extrusion grouting machine, or a hydraulic grouting pump.

[0048] After the above preparation work is completed, the operator first connects the grouting equipment 9 to the extra-long grouting steel pipe 21 whose outlet is farthest from the grouting end of the secondary grouting layer 4, and then pours the stirred non-shrinkage concrete grouting material into the hopper of the grouting pump 9. The grouting material is transported to the farthest area ⑤ of the secondary grouting layer 4 through the extra-long grouting steel pipe 21. According to the grouting time and grouting pressure calculated in the early stage, it is judged whether the grouting of this area is completed. Then, in the same way, fill the secondary far area ②, the middle area ③, the closer area ④ and the closest area ⑤ in turn; in this way, the secondary grouting layer 4 is gradually filled with grouting material from the far end to the near end of the overflow bucket 7 through the grouting steel pipe 2, until part of the grouting material overflows to the overflow bucket 7 and is about 100mm above the grouting layer 4, and the grouting is completed.

[0049] After the grouting is completed, the grouting equipment 9 is removed, and after the grouting material in the secondary grouting layer 4 hardens and reaches 75% strength, the outer closed template 6 and the overflow grout bucket 7 are removed, and the hardened grouting material in the overflow grout bucket 7 is chiseled out. Finally, the grouting steel pipe 2 protruding from the edge of the concrete foundation 1 is cut and removed, and finally the edge of the concrete foundation 1 is smoothed and finished with cement slurry.

[0050] The present invention also provides a grouting steel pipe arrangement structure for the grouting method of the secondary grouting layer of the above-mentioned equipment base, wherein the secondary grouting layer 4 is a cavity between the equipment base 3 and the concrete foundation 1, the length direction of the secondary grouting layer 4 is the grouting direction, one end of the secondary grouting layer 4 in the length direction is the grouting end, and the end opposite to the grouting end is the distal end, and the secondary grouting layer 4 is divided into a plurality of grouting areas connected in sequence along the grouting direction of the secondary grouting layer 4, and a plurality of grouting steel pipes 2 are arranged at intervals along the width direction of the secondary grouting layer 4 in each of the grouting areas, the outlet of the grouting steel pipe 2 is located in the grouting area, and the inlet extends outside the grouting end, and the outlets of the grouting steel pipes 2 in different grouting areas are staggered.

[0051] The secondary grouting layer 4 formed by the equipment base 3 and the concrete foundation 1 is divided into multiple grouting areas along the grouting direction of the secondary grouting layer 4, which is convenient for regional grouting. The grouting quality of each grouting area is ensured, thereby ensuring the grouting quality of the entire secondary grouting layer 4; then, multiple grouting steel pipes 2 of different lengths are evenly spaced along the width direction of the secondary grouting layer 4 through expansion bolts 8, and it is ensured that there are multiple grouting steel pipe 2 outlets in each grouting area, so that each grouting area can be grouted at multiple ends at the same time, ensuring that the grouting of the same grouting area is completed at the same time, and the grouting quality of each grouting area is consistent; the inlet of the grouting steel pipe 2 extends to the outside of the grouting end for connecting the grouting equipment 9.

[0052] In order to ensure that the grouting area of ​​each grouting steel pipe 2 is of the same size and each grouting area can be effectively filled, the grouting area is divided at a spacing of 2m, the horizontal spacing a of the outlets of adjacent grouting steel pipes 2 in the same grouting area is 2m, and the horizontal spacing b of the outlets of grouting steel pipes 2 in adjacent grouting areas is 2m; Figure 3 As shown, a grouting area is divided every 2m along the grouting direction of the secondary grouting layer 4, and it is specifically divided into five areas: the farthest area ①, the second farthest area ②, the middle area ③, the closer area ④ and the closest area ⑤. The grouting steel pipe 2 can be divided into an extra-long grouting steel pipe 21, a long grouting steel pipe 22, a medium grouting steel pipe 23, a shorter grouting steel pipe 24 and a short grouting steel pipe 25 according to its length. The horizontal layout spacing c between two adjacent grouting steel pipes is 0.4m; combined with Figure 3Taking the secondary distal region ② as an example, it can be seen that there are four long grouting steel pipes 22 in the secondary distal region ②, and the horizontal spacing a between two adjacent long grouting steel pipes 22 is 2m. The adjacent ones to the long grouting steel pipe 22 are the middle grouting steel pipe 23 in the middle region ③ and the shorter grouting steel pipe 24 in the closer region ④, and the vertical spacing b between the middle grouting steel pipe 23 and the long grouting steel pipe 22, and the shorter grouting steel pipe 24 and the long grouting steel pipe 22 are all 2m; thus, the secondary grouting There is an outlet of a grouting steel pipe 2 every 2m in layer 4. The grouting steel pipes 2 are arranged in this way to ensure the effective grouting range of each grouting steel pipe 2. If the planned grouting range is too large, the slurry fluidity is insufficient and the grouting area cannot be completely filled. If the planned grouting range is too small, the required amount of grouting steel pipes 2 increases and the cost increases. In addition, this arrangement can also calculate the required amount of slurry according to the specific size of the grouting area, which is convenient for controlling the grouting time and ensuring the grouting quality.

Claims

1. A grouting method for a secondary grouting layer of an equipment base, wherein the secondary grouting layer (4) is a cavity between the equipment base (3) and the concrete foundation (1), the length direction of the secondary grouting layer (4) is a grouting direction, one end of the secondary grouting layer (4) in the length direction is a grouting end, and the end opposite to the grouting end is a distal end, characterized in that: The steps include: Dividing the grouting area, dividing the secondary grouting layer (4) into a plurality of grouting areas connected in sequence along the grouting direction of the secondary grouting layer (4); Laying out grouting steel pipes (2), arranging a plurality of grouting steel pipes (2) spaced apart in the width direction of the secondary grouting layer (4) in each grouting area, wherein the outlet of the grouting steel pipe (2) is located in the grouting area, and the inlet extends to the outside of the grouting end; Installing a closed formwork (6), and installing the closed formwork (6) on the outside of the secondary grouting layer (4); Grouting, according to the distance between the grouting area and the grouting end, grouting is sequentially performed from far to near through the grouting steel pipe (2) to the secondary grouting layer (4), until the grouting of the grouting area closest to the grouting end is completed, and then the grouting is stopped; The closed formwork (6) is removed, and after the hardening strength of the slurry in the secondary grouting layer (4) reaches the required level, the closed formwork (6) is removed.

2. A grouting method for a secondary grouting layer of an equipment base as claimed in claim 1, characterized in that: The steps also include roughening the concrete foundation (1) before laying the grouting steel pipe (2).

3. A grouting method for a secondary grouting layer of an equipment base as claimed in claim 1, characterized in that: The grouting steel pipe (2) is laid out before the equipment base (3) is installed.

4. A grouting method for a secondary grouting layer of an equipment base as claimed in claim 1, characterized in that: An overflow hopper (7) is provided at the grouting end of the secondary grouting layer (4). The height of the overflow hopper (7) is greater than the height of the secondary grouting layer (4) and the opening faces upward. Whether the grouting is completed is judged by observing the height of the slurry overflowing into the overflow hopper (7). When the slurry overflowing into the overflow hopper (7) is higher than the secondary grouting layer (4), the grouting is completed and the grouting is stopped.

5. The grouting method for the secondary grouting layer of the equipment base according to claim 1, characterized in that: The diameter of the grouting steel pipe (2) is DN25-DN40.

6. A grouting method for a secondary grouting layer of an equipment base as claimed in claim 1, characterized in that: The outlets of the grouting steel pipes (2) in different grouting areas are arranged in a staggered manner.

7. A grouting method for a secondary grouting layer of an equipment base as claimed in claim 6, characterized in that: A grouting area is divided every 2 m along the grouting direction of the secondary grouting layer (4); the horizontal arrangement spacing of adjacent grouting steel pipe (2) outlets in the same grouting area is 2 m, and the vertical arrangement spacing of the grouting steel pipe (2) outlets in adjacent grouting areas is 2 m.

8. A grouting method for a secondary grouting layer of an equipment base as claimed in claim 1, characterized in that: The grouting steel pipe (2) is fixed on the concrete foundation (1) by means of expansion bolts (8), the expansion bolts (8) are arranged at intervals along the length direction of the grouting steel pipe (2), and the arrangement interval of the expansion bolts (8) is 1-1.5 m.

9. A grouting steel pipe arrangement structure for a grouting method for a secondary grouting layer of a base of an equipment as claimed in any one of claims 1 to 8, characterized in that: The secondary grouting layer (4) is a cavity between the equipment base (3) and the concrete foundation (1); the length direction of the secondary grouting layer (4) is the grouting direction; one end of the secondary grouting layer (4) in the length direction is the grouting end, and the end opposite to the grouting end is the distal end; the secondary grouting layer (4) is divided into a plurality of grouting areas connected in sequence along the grouting direction of the secondary grouting layer (4); a plurality of grouting steel pipes (2) are arranged at intervals in each grouting area along the width direction of the secondary grouting layer (4); the outlet of the grouting steel pipe (2) is located in the grouting area, and the inlet extends outside the grouting end; the outlets of the grouting steel pipes (2) in different grouting areas are arranged in a staggered manner.

10. The steel pipe arrangement structure of the secondary grouting layer of the equipment base according to claim 9, characterized in that: The grouting areas are divided at a spacing of 2 m, the outlets of adjacent grouting steel pipes (2) in the same grouting area are arranged horizontally at a spacing of 2 m, and the outlets of grouting steel pipes (2) in adjacent grouting areas are arranged vertically at a spacing of 2 m.

Images