CN111501772A - Construction method for supporting and protecting piles by combining grouting with steel pipes in SMW (soil mixing wall) construction method - Google Patents
Construction method for supporting and protecting piles by combining grouting with steel pipes in SMW (soil mixing wall) construction method Download PDFInfo
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- CN111501772A CN111501772A CN202010281540.7A CN202010281540A CN111501772A CN 111501772 A CN111501772 A CN 111501772A CN 202010281540 A CN202010281540 A CN 202010281540A CN 111501772 A CN111501772 A CN 111501772A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention relates to the technical field of foundation pit support, and discloses a construction method for supporting and protecting a pile by combining a grouting steel pipe in an SMW construction method, which comprises the following steps: 1) designing and constructing a SMW construction method pile; 2) constructing a steel pipe; 3) grouting the steel pipe; 4) pouring a crown beam; 5) excavating soil body in a layered and segmented manner; 6) constructing a preassembled steel plate, a pah rib cushion layer and a water stop steel plate; on the basis of the support of the SMW construction method pile, a steel pipe for supporting the upper end of the SMW construction method pile is arranged, and the SMW construction method pile provides support for a soil layer on the side wall of the foundation pit; the other end of the steel pipe is embedded into a soil body to form a support for the top of the pile in the SMW construction method, the other end of the steel pipe is provided with a plurality of slurry outlet holes, when cement slurry is injected into the steel pipe through high pressure, the cement slurry flows out through the slurry outlet holes, the cement slurry hardens a soil layer, the bearing capacity of the soil body in the range is improved, the support effect of the steel pipe on the pile in the SMW construction method is better, the support effect of the pile in the SMW construction method on the soil layer on the side wall of the foundation pit is better, and the problem that the top of the foundation pit is easy.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to a construction method for supporting and supporting a pile by combining a grouting steel pipe in an SMW construction method.
Background
At present, in a vertical supporting mode corresponding to the excavation depth of a foundation pit not more than 8m, modes such as supporting piles combined with prestressed anchor bars, supporting piles combined with diagonal braces or corner braces, or cantilever supporting of large-diameter cast-in-place piles are commonly adopted.
In the prior art, the foundation pit supporting structure of each government strictly forbids the provision of a ground wire, so that the supporting mode of combining a large-diameter cast-in-place pile with a prestressed anchor bar anchor rod cannot be applied when the ground wire is close to the excavation sideline of the foundation pit, and the cantilever supporting mode of adopting the large-diameter cast-in-place pile has large displacement deformation of the top of the pit and is not suitable for strictly controlling the deformation of the top of the pit when buildings and the like exist near the top of the pit.
Disclosure of Invention
The invention aims to provide a construction method for supporting and protecting a pile by combining an SMW construction method with a grouting steel pipe, and aims to solve the problem that the top of a foundation pit is easy to deform in the prior art.
The invention discloses a construction method for supporting and protecting a pile by combining a grouting steel pipe in an SMW (soil mixing wall) construction method, which comprises the following steps of:
1) designing and constructing the SMW construction method pile: the construction method comprises the steps of constructing the mixing pile through a mixing pile machine, carrying out guniting and drilling at a set position, then lowering H-shaped steel through a crane to a designed elevation to form the SMW construction method pile, and then temporarily fixing the SMW construction method pile until cement slurry is hardened.
2) Constructing a steel pipe; one end of the steel pipe supports the pile in the SMW construction method, the other end of the steel pipe extends downwards along the direction far away from the pile in the SMW construction method and is embedded into the soil, a plurality of grout outlet holes are formed in the other end of the steel pipe, and the inside of the steel pipe is communicated with the outside through the grout outlet holes.
3) Grouting the steel pipe; and grouting into the steel pipe, enabling the cement slurry to overflow from the slurry outlet hole, hardening the soil layer around the steel pipe, and enabling the soil layer around the steel pipe to be connected into a whole.
4) Pouring a crown beam; anchoring a steel backing plate welding anchor bar into a crown beam, pouring the crown beam, then excavating a groove to provide a construction space for welding the steel pipe and the steel backing plate, and fixing the steel backing plate and one end of the steel pipe to enable the crown beam and the steel pipe to be connected into a whole.
5) Excavating soil in a layered and segmented manner; excavating a soil body at the edge of the foundation pit, excavating the soil body in the foundation pit, exposing one end of the steel pipe, and embedding the other end of the steel pipe into the soil body.
6) Constructing a preassembled steel plate, a reinforcing bar cushion layer and a water stop steel plate; and after the soil body is excavated to the designed depth, the prefabricated steel plate is constructed in time, then a reinforcement cushion layer is constructed on the prefabricated steel plate, and finally the water stop steel plate is constructed.
Further, in the step 2), the plurality of pulp outlet holes are arranged in a quincunx shape, and the number of the pulp outlet holes is not less than 8.
Furthermore, a check valve is arranged on the slurry outlet.
Further, in the step 3), grouting is carried out once every 1.5h, the cement consumption of a single stirring pile is not less than 3000kg, and the grouting pressure is controlled at 1.52 MPa.
Further, in the step 4), the crown beam is provided with a facing surface facing the steel pipe, the facing surface is perpendicular to the steel pipe, the anchor bars are perpendicular to the facing surface, and the steel backing plate is attached to the facing surface.
Furthermore, a plurality of anchor bars are welded on the periphery of the steel backing plate at intervals in a surrounding mode.
Further, in the step 4), the outer wall welding of steel pipe has the set-square, the set-square is the triangle-shaped form, one side of set-square with the outer wall welded fastening of steel pipe, the another side of set-square with steel backing plate welded fastening.
Furthermore, the end part of the other end of the steel pipe is conical to form a conical end, the conical end is provided with a plurality of slurry outlet strips, and the slurry outlet strips extend along the length direction of the steel pipe; and a plurality of the pulp outlet strips are arranged at intervals and circularly along the conical end.
Further, in the step 5), after the soil body is excavated, drainage ditches are arranged on the front side and the rear side of the H-shaped steel.
Further, in the step 2), the construction method of supporting and supporting the pile by combining the SMW construction method with the grouting steel pipe comprises a plurality of steel pipes which are arranged at intervals along the extending direction of the side wall of the foundation pit; before the steel pipes are constructed, the bearing capacity of the single steel pipe after grouting is tested, and therefore the interval between the steel pipes is determined.
Compared with the prior art, the construction method combining the SMW construction method pile with the grouting steel pipe support is characterized in that a steel pipe for supporting the upper end of the SMW construction method pile is arranged on the basis of the SMW construction method pile support, and the SMW construction method pile provides support for a foundation pit side wall soil layer; the other end of the steel pipe is embedded into a soil body to form a support for the top of the pile in the SMW construction method, and the other end of the steel pipe is provided with a plurality of grout outlet holes; when cement slurry is injected into the steel pipe at high pressure, the cement slurry flows out through the slurry outlet hole, the soil layer around the slurry outlet hole is hardened, the bearing capacity of the soil body in the range is improved, the steel pipe is further fixed, and the supporting effect of the steel pipe on the SMW construction method pile is better, so that the supporting effect of the SMW construction method pile on the side wall soil layer of the foundation pit is better, and the problem that the top of the foundation pit is easy to deform is solved.
Drawings
Fig. 1 is a schematic flow chart of the steps of a construction method of a pile combined with a grouting steel pipe support according to an SMW construction method provided by an embodiment of the invention;
fig. 2 is a schematic perspective view of a support and support of a pile combined with a grouting steel pipe in an SMW construction method according to an embodiment of the present invention;
FIG. 3 is a schematic perspective view of the connection between a steel pipe and a crown beam according to an embodiment of the present invention;
fig. 4 is an enlarged schematic view of a portion a in fig. 2 according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
Referring to fig. 1-4, preferred embodiments of the present invention are provided.
The invention provides a construction method for supporting and protecting a pile by combining a grouting steel pipe in an SMW construction method, which comprises the following steps:
1) designing and constructing an SMW construction method; measuring and paying off, excavating a guide groove and positioning; and excavating a working groove according to the enclosing center line, paving guiding and positioning section steel on two sides of the working groove, and fixing by spot welding.
According to the positioning, a mixing pile machine is utilized to construct a mixing pile, slurry is sprayed to drill the mixing pile, cement is sprayed into a soil body and is fully mixed, so that the cement and the soil generate a series of physical and chemical reactions, soft soil is hardened, and the strength of the foundation is improved, in the embodiment, the three-shaft mixing pile is used, because the drilling depth is greater than the hole depth, a long spiral hole guiding construction scheme is selected, when the pile machine is in place, the pile machine is stably stood and leveled, a drill bit is aligned to the pile position, the deviation is not greater than 50mm, the verticality is controlled within 1%, when the hole is drilled, the speed is firstly slow and then fast, the hole drilling speed; after the drill rod is lifted out of the ground and the drilling machine is moved away after the drill rod is drilled to the preset depth, mud and mud around the drill hole are cleaned in time to prevent the drill hole from collapsing.
After the hole guiding is finished, pressing the pile immediately; in the pile sinking process, the pile sinking pressure and the pile sinking speed are controlled, the pressure control is taken as the main point, and the pile sinking depth is as close as possible to the designed elevation.
Welding and processing steel plates into H-shaped steel 10, after the quality of the H-shaped steel 10 is qualified, hoisting and lowering the H-shaped steel 10 by using a crane, inserting the H-shaped steel 10 into cement slurry, forming the SMW construction method pile together with a stirring pile and the cement slurry, arranging the SMW construction method pile close to the side wall soil layer of the foundation pit to provide support for the side wall soil layer of the foundation pit, temporarily fixing the SMW construction method pile until the cement slurry is hardened after the SMW construction method pile reaches a set elevation, and intensively cleaning and recycling the displaced cement slurry before the cement is hardened.
Before the cement slurry in the foundation pit is placed under the H-shaped steel 10, the cement slurry needs to be stirred, stirring piles with the diameter of 650mm are generally used for stirring, stirring piles with the diameter of 850mm or 1000mm are selected for stirring for poor foundation pit drawing conditions or foundation pit surrounding environment sensitive to foundation pit excavation deformation, and pile intervals among the stirring piles are selected according to calculation and anti-permeability requirements.
Furthermore, the cement mixing ratio of the mixing pile is not less than 24%, the soil and the cement are mixed, the soil layer and the cement slurry are fixed and connected into a whole, and the foundation is reinforced.
The H-shaped steel 10 used in the embodiment adopts HN700x300x13x24, the steel material is No. Q235B steel, and the steel material meeting the strength requirement can be selected according to calculation; the H-shaped steel 10 is inserted within 30min after the cement slurry stirring construction is finished, and is inserted before the cement slurry is solidified, so that the insertion of the H-shaped steel 10 and the fixation between the cement slurry and the H-shaped steel 10 are facilitated, the flatness and the quality of joint welding seams of the H-shaped steel 10 are checked before the H-shaped steel 10 is inserted, and the isolating agent is coated on the outer side of the H-shaped steel 10.
2) Constructing a steel pipe 20; in the embodiment, the Q345 seamless steel pipe 20 with the diameter of 200mm to 350mm is used, and the specific diameter of the steel pipe 20 is calculated and selected according to the depth of the foundation pit and the soil parameters. One end of the steel pipe 20 supports the pile of the SMW construction method, the other end extends and is embedded into the soil body in an inclined mode along the direction far away from the pile of the SMW construction method, and a plurality of grout outlet holes 21 are arranged in the range of 2000mm at the other end of the steel pipe 20, in the embodiment, the number of the grout outlet holes 21 is not less than 8, the grout outlet holes are arranged in a quincunx shape, the diameter of the grout outlet holes is 6mm to 8mm, the interior of the steel pipe 20 is communicated with the outside through the grout outlet holes 21, the arrangement can ensure that cement grout overflowing from the grout outlet holes 21 is uniformly distributed on the soil layer around the other end of the steel pipe 20, and check valves 22 are arranged on the; after the steel pipe 20 is installed, grouting is performed into the steel pipe 20 from one end of the steel pipe 20, cement grout flows to the other end of the steel pipe 20 along the steel pipe 20 and flows out of the grout outlet 21 to be fixed with a soil layer in contact with the other end of the steel pipe 20, a hardened soil layer region is formed, and the effect of fixing and supporting is enhanced.
Before construction, the steel pipes 20 are tested, the bearing capacity of a single steel pipe 20 is tested, and the horizontal supporting force of the single steel pipe 20 is calculated, so that the distance between the steel pipes 20 is determined.
In addition, the other end of the steel pipe 20 is conical to form a conical end 23, a plurality of grout outlet strips 24 are formed on the conical end 23, the grout outlet strips 24 extend along the length direction of the steel pipe 20 to communicate the interior of the steel pipe 20 with the outside, and the grout outlet strips 24 are arranged around the conical end 23 at intervals, so that the cement grout sprayed out of the steel pipe 20 can be uniformly distributed, and soil layers around the steel pipe 20 can be hardened soil layers.
3) The steel pipe 20 is grouted, wherein P.042.5 common cement mortar is adopted as grouting liquid in the embodiment, three times of grouting are carried out during grouting, grouting is carried out once every 1.5h, the grouting water cement ratio is controlled to be 0.5-0.6, the cement amount of a single steel pipe 20 is not less than 3000kg, the grouting flow is exquisite at 20-30L/min, the single cement control amount and the final grouting pressure are controlled to be 1.52MPa according to the final grouting completion standard, high-pressure grouting is used in the embodiment, the cement slurry is injected into a soil body through a high-pressure agent, a hardened soil area in a certain range is formed around the steel pipe 20, the bearing capacity of the soil body in the range is improved, and the supporting effect is better.
4) Pouring the crown beam 11; after the steel pipe 20 is grouted, a crown beam 11 is arranged at one end of the pile in the SMW construction method, a steel backing plate 14 is welded with anchor bars 13 and anchored into the crown beam 11, a plurality of anchor bars 13 are arranged around the periphery of the steel backing plate 14 at intervals, then the crown beam 11 is poured, the steel backing plate 14 and the crown beam 11 are fixed, after the crown beam 11 meets the design strength requirement, a triangular plate 15 is welded on the steel pipe 20, the steel pipe 20 and the steel backing plate 14 are fixed, and therefore the crown beam 11 and the steel pipe 20 are connected into a whole.
The end part of the crown beam 11 extends towards the direction of the steel pipe 20 and forms an orientation surface 12 facing the steel pipe 20, the orientation surface 12 is vertical to the steel pipe 20, the steel liner plate 14 is attached to the orientation surface 12, one end of the anchor bar 13 is welded with the steel liner plate 14, the other end extends towards the direction of the surface 12 and is embedded into the crown beam 11 perpendicular to the orientation surface 12, and the steel liner plate 14 and the crown beam 11 are fixed; the other end of the steel shim plate 14 abuts against the steel pipe 20, and the steel shim plate 14 and the steel pipe 20 are fixed by the triangular plate 15, thereby integrally connecting the crown beam 11 and the steel pipe 20.
The set-square 15 is the triangle-shaped, and one side welded fastening steel pipe 20's of set-square 15 lateral wall, the another side is fixed with the steel backing plate 14, and a plurality of set-squares 15 encircle the lateral wall interval arrangement of steel pipe 20, are even whole with steel backing plate 14 with steel pipe 20.
5) Excavating soil body in a layered and segmented manner; because the steel pipe 20 in this embodiment is obliquely inserted into the soil body, the soil body above the side pad layer of the foundation pit is difficult to dig, so the side soil body of the pit is excavated firstly, then the soil body in the pit is excavated, layered and segmented excavation is carried out until the design depth, the bottom elevation of the foundation pit is excavated, and the other end of the steel pipe 20 is embedded into the soil layer below the bottom elevation of the foundation pit.
6) Constructing a preassembled steel plate, a reinforcing bar cushion layer and a water stop steel plate; after excavating the soil body to the design depth, in time carry out the construction of prepackage type steel sheet, the size accessible of steel sheet accords with cement bed course bearing capacity and foundation ditch block regional scope and synthesizes and confirms, then cast-in-place arrangement of reinforcement bed course on prepackage type steel sheet, the construction thickness of arrangement of reinforcement bed course is 100 ~ 200mm in this embodiment.
According to the construction method for combining the SMW construction method pile with the grouting steel pipe support, the steel pipe 20 for supporting the upper end of the SMW construction method pile is arranged on the basis of the SMW construction method pile support, and the SMW construction method pile provides support for a soil layer on the side wall of the foundation pit; the other end of the steel pipe 20 is embedded into a soil body to form a support for the upper end of the pile constructed by the SMW construction method, and the other end of the steel pipe 20 is provided with a plurality of grout outlet holes 21; when cement slurry is injected into the steel pipe 20 at high pressure, the cement slurry flows out through the slurry outlet 21, soil layers around the slurry outlet 21 are hardened, the bearing capacity of soil bodies in the range is improved, the steel pipe 20 is further fixed, the supporting effect of the steel pipe 20 on the pile in the SMW construction method is better, the supporting effect of the pile in the SMW construction method on the soil layer on the side wall of the foundation pit is better, and the problem that the top of the foundation pit is easy to deform is solved.
And drainage ditches 16 are arranged on soil bodies on two sides of the SMW construction method pile, water stopping steel plates are arranged on the drainage ditches 16, water stopping is carried out through the water stopping steel plates, leakage is prevented, and water is prevented from spreading to a construction area.
Along the direction of the side wall of the foundation pit, the SMW method piles support the side wall of the foundation pit, and a plurality of steel pipes 20 are arranged at intervals along the direction in which the side wall of the foundation pit extends, supporting the SMW method piles.
The invention has the following advantages:
1) the SMW construction method pile combines support and seepage prevention, has a support form with rigidity and seepage prevention functions required by a support soil body, supports a soil layer on the side wall of a foundation pit, is additionally provided with a steel pipe 20 to support the upper end of the SMW construction method pile, and adds a layer of support to the upper end of the SMW construction method pile, so that the support effect of the upper end of the SMW construction method pile is better, and the problem that the top of the foundation pit soil body is easy to deform is solved.
2) The steel pipe 20 used in the invention is provided with the grout outlet 21, and after grouting into the steel pipe 20, grout can flow out from the grout outlet 21 to harden the soil layer around the steel pipe 20, so that the bearing capacity of the soil body in the area is greatly improved, and the supporting effect of the steel pipe 20 is better.
3) According to the construction method, the SMW construction method pile is firstly constructed, the steel pipe 20 is secondly constructed, grouting is carried out, the soil in the pit can be excavated after the grouting body meets the strength requirement, pile supports and pile anchor structures are educated, the construction period is saved by about 30-40%, the construction of an excavating machine is facilitated due to the design without an inner support, the excavating efficiency is greatly improved, the construction speed can be obviously improved, and the rapid construction of a main structure after the excavation is finished is facilitated.
4) In the technology, the pile in the SMW construction method is used as a fender pile structure of the foundation pit, and can be combined with the grouting steel pipe 20 for supporting synchronous or asynchronous construction, so that large-area earth excavation in the pit can be realized, and compared with a pile support and pile anchor structure, the construction cost is saved by 15-25%.
5) After the foundation pit construction is finished, partial recycling can be realized by the support of the grouting steel pipe 20, and compared with the design of a diagonal brace and a corner brace, the large-volume support structure is saved, the cost is reduced, the energy consumption is saved by about 20%, and the low-carbon environment-friendly effect is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
- The construction method of the pile combined grouting steel pipe support in the SMW construction method is characterized by comprising the following steps of:1) designing and constructing the SMW construction method pile: the construction method comprises the steps of constructing a mixing pile through a mixing pile machine, carrying out guniting and drilling at a measuring position, then lowering H-shaped steel through a crane to a designed elevation to form the SMW construction method pile, and then temporarily fixing the SMW construction method pile until cement slurry is hardened.2) Constructing a steel pipe; one end of the steel pipe supports the pile in the SMW construction method, the other end of the steel pipe extends downwards along the direction far away from the pile in the SMW construction method and is embedded into the soil, a plurality of grout outlet holes are formed in the other end of the steel pipe, and the inside of the steel pipe is communicated with the outside through the grout outlet holes.3) Grouting the steel pipe; and grouting into the steel pipe, enabling the cement slurry to overflow from the slurry outlet hole, hardening the soil layer around the steel pipe, and enabling the steel pipe and the soil layer to be connected into a whole.4) Pouring a crown beam; anchoring a steel backing plate welding anchor bar into a crown beam, pouring the crown beam, then excavating a groove to provide a construction space for welding the steel pipe and the steel backing plate, and fixing the steel backing plate and one end of the steel pipe to enable the crown beam and the steel pipe to be connected into a whole.5) Excavating soil in a layered and segmented manner; excavating a soil body at the edge of the foundation pit, excavating the soil body in the foundation pit, exposing one end of the steel pipe, and embedding the other end of the steel pipe into the soil body.6) Constructing a preassembled steel plate, a reinforcing bar cushion layer and a water stop steel plate; and after the soil body is excavated to the designed depth, the prefabricated steel plate is constructed in time, then a reinforcement cushion layer is constructed on the prefabricated steel plate, and finally the water stop steel plate is constructed.
- 2. The construction method of an SMW-process pile combined with a grouted steel pipe support according to claim 1, wherein in the step 2), the plurality of grout outlet holes are arranged in a quincunx shape, and the number of the grout outlet holes is not less than 8.
- 3. The SMW construction method of claim 1, wherein a check valve is disposed on the grout outlet.
- 4. The construction method of a pile combined with a grouted steel pipe support according to any one of claims 1 to 3, wherein in the step 3), grouting is performed every 1.5h, the cement consumption of a single mixing pile is not less than 3000kg, and the grouting pressure is controlled at 1.52 Mpa.
- 5. The SMW construction method according to any one of claims 1 to 3, wherein the cap beam has a facing surface facing the steel pipe in step 4), the facing surface is arranged perpendicular to the steel pipe, the anchor bar is perpendicular to the facing surface, and the steel plate is attached to the facing surface.
- 6. The SMW-process pile-in-grouting steel pipe support and support structure according to claim 5, wherein a plurality of the anchor bars are welded around the outer circumference of the steel backing plate at intervals.
- 7. The SMW method pile combined grouting steel pipe support construction method of claim 5, wherein in the step 4), a triangular plate is welded to an outer wall of the steel pipe, the triangular plate is triangular, one side of the triangular plate is welded to the outer wall of the steel pipe, and the other side of the triangular plate is welded to the steel pad.
- 8. The construction method of an SMW-process pile combined with a grouted steel pipe support according to any one of claims 1 to 3, wherein the other end of the steel pipe is conical to form a tapered end, the tapered end having a plurality of grout outlet strips extending along the length direction of the steel pipe; and a plurality of the pulp outlet strips are arranged at intervals and circularly along the conical end.
- 9. The construction method of a pile support and support by combining an SMW method according to any one of claims 1 to 3, wherein in the step 5), drainage ditches are provided at front and rear sides of the H-shaped steel after soil excavation is completed.
- 10. The construction method of an SMW pile combined with a grouting steel pipe support and support as claimed in any one of claims 1 to 3, wherein in the step 2), the construction method of the SMW pile combined with the grouting steel pipe support and support comprises a plurality of steel pipes which are arranged at intervals along the extending direction of the side wall of the foundation pit; before the steel pipes are constructed, the bearing capacity of the single steel pipe after grouting is tested, and therefore the interval between the steel pipes is determined.
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| CN112761166A (en) * | 2021-02-23 | 2021-05-07 | 广东科能工程管理有限公司 | Construction method for shallow foundation pit of combined support of piles and pre-grouting steel pipes based on SMW (soil mixing wall) construction method |
| CN113550319A (en) * | 2021-06-24 | 2021-10-26 | 中铁四局集团有限公司 | Foundation pit construction method based on micro-disturbance construction method pile |
| CN114204885A (en) * | 2021-11-29 | 2022-03-18 | 中机国能电力工程有限公司 | Integrated photovoltaic support suitable for soft soil and construction method thereof |
| CN115110540A (en) * | 2022-07-27 | 2022-09-27 | 中建铁路投资建设集团有限公司 | SMW worker method stake and stand stake combination supporting construction |
| CN115450223A (en) * | 2022-09-02 | 2022-12-09 | 华煜建设集团有限公司 | Be applied to preceding support of weak soil area foundation ditch slip casting steel pipe and strut |
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| CN114204885A (en) * | 2021-11-29 | 2022-03-18 | 中机国能电力工程有限公司 | Integrated photovoltaic support suitable for soft soil and construction method thereof |
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| CN115450223A (en) * | 2022-09-02 | 2022-12-09 | 华煜建设集团有限公司 | Be applied to preceding support of weak soil area foundation ditch slip casting steel pipe and strut |
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