CN111119219A - Reinforced foundation tire membrane structure and construction method thereof - Google Patents
Reinforced foundation tire membrane structure and construction method thereof Download PDFInfo
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- CN111119219A CN111119219A CN202010008892.5A CN202010008892A CN111119219A CN 111119219 A CN111119219 A CN 111119219A CN 202010008892 A CN202010008892 A CN 202010008892A CN 111119219 A CN111119219 A CN 111119219A
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- 238000010276 construction Methods 0.000 title claims abstract description 45
- 239000012528 membrane Substances 0.000 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 136
- 239000010959 steel Substances 0.000 claims abstract description 136
- 239000002689 soil Substances 0.000 claims abstract description 102
- 239000004568 cement Substances 0.000 claims abstract description 99
- 239000010410 layer Substances 0.000 claims abstract description 82
- 239000004567 concrete Substances 0.000 claims abstract description 38
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 29
- 239000011241 protective layer Substances 0.000 claims abstract description 17
- 210000004379 membrane Anatomy 0.000 claims description 36
- 230000003014 reinforcing effect Effects 0.000 claims description 17
- 210000002219 extraembryonic membrane Anatomy 0.000 claims description 12
- 238000005056 compaction Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 230000009545 invasion Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 description 7
- 239000011449 brick Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000009435 building construction Methods 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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Abstract
The invention provides a reinforced foundation membrane structure and a construction method thereof, wherein the reinforced foundation membrane structure comprises the following steps: the waterproof structure comprises a foundation concrete cushion layer, a waterproof protective layer and two triangular steel bar forming devices; the foundation concrete cushion layer, the waterproof layer and the waterproof protective layer are sequentially arranged in a laminated mode from the bottom of the foundation pit upwards; the outlines of the waterproof layer and the waterproof protective layer are matched with the shape of the foundation pit; the two triangular reinforcing steel bar forming devices are filled with cement improved soil and are symmetrically arranged on two sides of the foundation pit and connected with the waterproof layer positioned on the side wall of the foundation pit; the top of the foundation concrete cushion is level with the bottoms of the two triangular forming devices. The invention adopts the cement soil and the cement blanket to form the triangular retaining wall tire membrane, thereby not only ensuring the strength of the tire membrane, but also isolating the invasion of underground water, being beneficial to ensuring the construction quality, accelerating the construction progress and saving the construction cost.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a reinforced foundation membrane structure and a construction method thereof.
Background
In the existing building construction, the time for exposing a base is required to be reduced as much as possible in the construction of an underground foundation, and particularly for deep foundation pit engineering with high risk, a support conversion system needs to be formed as early as possible for the safety and stability of a supporting structure. Traditional templates such as foundation beam, cushion cap, sump pit adopt the brick brickwork as the brick fetal membrane, and brick fetal membrane both sides need carry out mortar and plaster and make level, can carry out the construction of follow-up work types such as follow-up coiled material waterproof layer after reaching the dryness factor requirement of plastering, and the masonry engineering volume is big, the input manpower is more, and the mortar curing time of plastering is long, can have the fracture phenomenon, drawbacks such as construction quality difficulty assurance.
Disclosure of Invention
In view of the above, the invention provides a reinforced foundation membrane structure and a construction method thereof, and aims to solve the problems that in the prior art, the construction progress is slow and the construction quality is difficult to guarantee due to the fact that brick masonry is adopted as a brick membrane.
In one aspect, the present invention provides a reinforced base membrane structure, including: the waterproof structure comprises a foundation concrete cushion layer, a waterproof protective layer and two triangular steel bar forming devices; the foundation concrete cushion layer, the waterproof layer and the waterproof protective layer are sequentially arranged in a laminated mode from the bottom of the foundation pit to the top; the contour of the waterproof layer and the waterproof protective layer is matched with the shape of the foundation pit; the two triangular reinforcing steel bar forming devices are filled with cement improved soil and are symmetrically arranged on two sides of the foundation pit and connected with the waterproof layer positioned on the side wall of the foundation pit; the top of the foundation concrete cushion is level with the bottoms of the two triangular forming devices.
Further, in the above-mentioned reinforcement basis fetal membrane structure, triangle-shaped forming device includes: a right-angle steel bar support; the cement blankets are obliquely erected between two sides of the right-angle steel bar support, the right-angle steel bar support and the cement blankets form a triangular area, and cement improved soil is filled in the triangular area to form a triangular soil pile retaining wall; one end of the cement blanket is certainly the triangle-shaped soil is piled outside extension of barricade bottom and is laid first length of predetermineeing, the other end of cement blanket certainly triangle-shaped soil is piled barricade top to basic concrete cushion top extends and is in basic concrete cushion top extends the second length of predetermineeing.
Further, in the above-mentioned reinforcement basis fetal membrane structure, the right angle steel support includes: a plurality of first vertical steel bars arranged at intervals, a plurality of first transverse steel bars arranged at intervals and a plurality of L-shaped steel bars arranged at intervals; the bottom of each first vertical steel bar is inserted into a foundation pit outer foundation soil tamping layer, and the bottom of each first vertical steel bar and each first transverse steel bar are crossed to form a net structure; each L-shaped steel bar is arranged between two adjacent first vertical steel bars, one side, with the longer length, of each L-shaped steel bar is arranged in parallel with each first vertical steel bar, and one side, with the shorter length, of each L-shaped steel bar is arranged on the plane where the top of the foundation concrete cushion layer is located along the horizontal direction.
Further, in the above-mentioned reinforcement basis fetal membrane structure, triangle-shaped forming device still includes: the second transverse steel bars and the plurality of second vertical steel bars; the second vertical steel bars are inserted into the foundation pit outer foundation soil rammed layer from the surface of the cement blanket, and the second transverse steel bars are connected with the second vertical steel bars; one end, far away from the first vertical steel bar, of the side, with the shorter length, of each L-shaped steel bar is connected with each second vertical steel bar; and the second transverse reinforcing steel bars are paved at the bottom of the cement blanket.
According to the invention, the triangular reinforcing steel bar forming devices filled with the cement improved soil are respectively arranged on two sides of the foundation pit, and the cement soil and the cement blanket are adopted to form the retaining wall tire membrane with the triangular soil pile structure, so that the strength of the tire membrane is ensured, the invasion of underground water is isolated to a certain extent, the application of the cement blanket plays a role in wrapping the cement improved soil to enable the cement improved soil to be integral when loaded, the adverse factors of longer supporting length of the foundation floor, larger time consumption, more use of masonry materials and the like in the prior art are overcome, the construction quality is favorably ensured, the construction progress is accelerated, and the construction cost is greatly saved.
On the other hand, the invention also provides a construction method of the reinforced foundation membrane structure, which comprises the following steps: step 1, after pile breaking is completed and earthwork of a working surface at the periphery of a foundation pit is cleaned, concrete pouring is carried out on a foundation cushion layer and a raft surface base around the foundation pit is tamped; step 2, inserting a plurality of first vertical steel bars into the foundation pit outer base soil compaction layer, binding a plurality of first transverse steel bars to form a steel bar mesh, and binding L-shaped steel bars on the steel bar mesh to form a right-angle steel bar support; step 3, filling cement improved soil in the right-angle steel bar support and tamping to form a triangular soil pile retaining wall, and covering a cement blanket at the bevel edge of the triangular soil pile retaining wall after watering and maintaining until the cement improved soil reaches a certain strength; step 4, inserting a second vertical reinforcing steel bar into the foundation pit outer base plain soil tamping layer along the end part of the foundation pit outer cement blanket to a certain depth, and welding a second transverse reinforcing steel bar with second vertical reinforcing steel bars positioned at two ends so as to firmly lay and attach the cement blanket; step 5, after the cement blanket is cured, performing foundation pit outer raft foundation earthwork backfilling and tamping and foundation pit outer cushion layer concrete pouring; and 6, binding and pouring concrete with the waterproof layer and the waterproof protective layer of the raft surface and the reinforcing steel bars in the foundation pit.
Further, in the construction method of the reinforced foundation membrane structure, in the step 2, the distance between the first vertical steel bars is 200-300mm, and the distance between the first transverse steel bars is 150-200 mm.
Further, in the construction method of the reinforced foundation membrane structure, the length of the first vertical steel bar is greater than the height of the foundation membrane and less than 2 times of the height of the foundation membrane.
Further, in the construction method of the reinforced foundation fetal membrane structure, the second vertical steel bars and the first vertical steel bars are inserted into the foundation pit outer base plain soil tamped layer to the same depth.
Further, in the construction method of the reinforced foundation membrane structure, after the second transverse steel bars and the second vertical steel bars are welded, the second vertical steel bars at two ends are continuously hammered, so that the cement blanket is firmly paved and fixed.
Further, in the construction method of the reinforced foundation fetal membrane structure, the second vertical steel bars and the first vertical steel bars are inserted into the foundation pit outer base plain soil tamped layer to the same depth.
Compared with the prior art, the construction method of the reinforced foundation bed course provided by the invention has the beneficial effects that the retaining wall bed course of a triangular soil pile structure is formed by adopting the cement soil and the cement blanket, the strength of the bed course is ensured, the invasion of underground water is isolated to a certain extent, the application of the cement blanket plays a role in wrapping the cement soil to ensure the integrity of the cement soil when loaded, in addition, a smooth adhesive surface is provided for the construction of a subsequent waterproof layer, and the reinforced soil consolidation concept is adopted to match the function of the cement blanket, so that the construction progress is greatly accelerated, and the cost is saved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a cross-sectional view of a reinforced base membrane structure provided in accordance with an embodiment of the present invention;
FIG. 2 is a detail view of a reinforced base membrane structure according to an embodiment of the present invention;
fig. 3 is a structural diagram of a mesh reinforcement according to an embodiment of the present invention;
fig. 4 is a construction flow chart of a reinforced foundation membrane structure provided in the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 and 2, a reinforced base membrane structure according to an embodiment of the present invention includes: the waterproof structure comprises a basic concrete cushion layer 1, a waterproof layer 2, a waterproof protective layer 3 and two triangular steel bar forming devices 4; the foundation concrete cushion layer 1, the waterproof layer 2 and the waterproof protective layer 3 are sequentially arranged in a laminated mode from the bottom of the foundation pit to the top; the outlines of the waterproof layer 2 and the waterproof protective layer 3 are matched with the shape of the foundation pit; the two triangular reinforcing steel bar forming devices 4 are symmetrically arranged on two sides of the foundation pit and are connected with the waterproof layer 2 positioned on the side wall of the foundation pit; the two triangular steel bar forming devices 4 are filled with cement improved soil 7, and the outer sides of the triangular steel bar forming devices are covered with cement blankets 5 to form triangular soil pile retaining walls; the top of the foundation concrete cushion 1 is level with the bottoms of the two triangular forming devices 4.
Specifically, a foundation pit inner foundation soil compaction layer a is arranged right below a foundation concrete cushion layer 1 positioned inside a foundation pit, a foundation pit outer foundation soil compaction layer b is arranged right below two triangular forming devices, the foundation pit inner foundation soil compaction layer and the foundation pit outer foundation soil compaction layer are connected into a whole in a step shape, and the height of the foundation pit inner foundation soil compaction layer a is smaller than that of the foundation pit outer foundation soil compaction layer b.
The triangle forming device is in a right-angled triangle shape, one right-angled side of the triangle forming device is connected with the waterproof layer 2, and the other right-angled side of the triangle forming device is connected with the top of the foundation soil tamping layer b outside the foundation pit. And the outside of the bevel edge of the triangular forming device is a foundation pit outside plain soil tamping layer c. Preferably, the triangle forming device is an isosceles right triangle.
Referring to fig. 2 and 3, the triangular molding apparatus 4 includes: a right-angle steel bar bracket 41; wherein, the cement blanket is obliquely arranged between the two sides of the right-angle steel bar bracket; the right-angle steel bar support and the cement blanket form a triangular area, and cement improved soil 7 is filled in the triangular area to form a triangular soil pile retaining wall; one end of the cement blanket 5 is from the triangle-shaped soil is piled retaining wall bottom and outwards extends and lays first predetermined length, the other end of the cement blanket 5 is from the triangle-shaped soil is piled retaining wall top to 1 top of basic concrete cushion extends and is in the top of basic concrete cushion extends the second predetermined length. The first preset length L1 and the second preset length L2 are both greater than or equal to 150mm, so as to ensure the stress stability of the cement blanket and avoid deformation and displacement of the laid cement blanket when the earth is backfilled at the back. The right-angle steel bar support is attached to the waterproof layer, and the cement blanket on the slope surface of the triangular soil pile retaining wall is connected with the plain soil tamping layer c on the outer side of the foundation pit. In practice, the right-angle steel bar support is formed into a triangular soil pile retaining wall by using cement improved soil, and then is attached to the waterproof layer.
The cement-modified soil is a mixture of ground soil, cement and water. The cement improved soil proportioning test can be firstly carried out, the cement improved soil with different ash doping rates is respectively subjected to test comparison analysis, and the cement improved soil proportioning scheme for finally meeting the performance of the cement improved soil required by construction requirements is determined. The test analysis can comprise the influence of the ash mixing amount on the strength characteristic, the influence of the ash mixing amount on the bearing ratio, the influence of the age on the strength characteristic and the like, and the test shows that 7-15% of the cement has better soil improvement performance, can form early strength more quickly, can shorten the construction period, has lower cost and can reduce the construction cost.
In the embodiment, the cement modified soil 7 and the cement blanket 5 are adopted to form the retaining wall tire membrane with a triangular soil pile structure, so that the strength of the tire membrane is ensured, the invasion of underground water is isolated to a certain extent, the cement blanket is applied to wrap the cement soil to enable the integrity of the cement soil to be loaded, and a smooth adhesive surface is provided for the construction of a subsequent waterproof layer.
More specifically, the right-angle reinforcing bar support 41 includes: a plurality of first vertical steel bars 411 arranged at intervals, a plurality of first transverse steel bars 412 arranged at intervals and a plurality of L-shaped steel bars 413 arranged at intervals; the bottom of each first vertical steel bar 411 is inserted into a foundation soil tamping layer outside the foundation pit, and is crossed with each first transverse steel bar 412 to form a net structure; each L-shaped steel bar is arranged between two adjacent first vertical steel bars 411, one side, with the longer length, of each L-shaped steel bar 413 is arranged in parallel with each first vertical steel bar, and one side, with the shorter length, of each L-shaped steel bar 413 is arranged on the plane where the top of the foundation concrete cushion layer is located along the horizontal direction. The L-shaped steel ribs 413 are arranged on the mechanical property, so that the effect of keeping a stress balance state under the action of lateral stress is achieved, and the stability of the triangular soil-piled retaining wall when a fetal membrane is loaded is enhanced.
The first vertical steel bars 411 are made of three-level steel with the specification above # 22, the first vertical steel bars can be made of leftover materials meeting the requirements after steel bar blanking, and loss of materials is reduced while a cement soil pile retaining wall support is formed. The distance between the first vertical steel bars 411 is 200mm and 300 mm; the distance between the first transverse reinforcing bars 412 is 150mm-200 mm. Each first transverse steel bar 412 is bound and connected with each first vertical steel bar 411 to form a steel bar mesh. The L-shaped reinforcing bars may be bound between any two adjacent first vertical reinforcing bars 411. The L-shaped reinforcing steel bar 413 can be made of three-grade steel with the specification of more than 22#, the ratio of the long side to the short side of the L-shaped reinforcing steel bar is 2:1, and the size of the short side is slightly smaller than the height of the foundation tire membrane h. The shorter side of the L-shaped reinforcing steel bar is lapped with the bottom of the cement blanket.
The triangle forming device 4 further includes: a second transverse reinforcement 43 and a plurality of second vertical reinforcements 42; the second vertical steel bars 42 are inserted into the foundation pit outer foundation soil rammed earth layer from the surface of the cement blanket, and the second transverse steel bars 43 are connected with the second vertical steel bars 42; one end of each L-shaped steel bar 413, which is far away from the first vertical steel bar 411, at the shorter side is connected to each second vertical steel bar 42; the second transverse reinforcement 43 is applied to the bottom of the cement blanket 5. And the second transverse steel bars are welded with the tops of the second vertical steel bars. The cement blanket 5 is inserted with the second vertical reinforcing steel bar 43 and welded by the second transverse reinforcing steel bar 43, so that the whole extrusion anchoring effect on the cement blanket 5 is achieved, and the anti-overturning capability of the L-shaped reinforcing steel bar is enhanced to a certain extent.
The depth of the second vertical steel bars 42 and the depth of the first vertical steel bars 411 inserted into the foundation pit outer base soil tamping layer b are the same, and the second vertical steel bars and the first vertical steel bars are not smaller than the height h of the foundation tyre film. The length of the second vertical reinforcing bars 42 may be slightly greater than the height h of the base membrane and less than 2 times the height (2h) of the base membrane.
The waterproof layer 2 and the waterproof protective layer 3 are both of a notch structure with an upward opening, and a foundation pit outer concrete cushion layer e is arranged between the waterproof layer 2 at the top and the top of the foundation pit outer side soil compaction layer c.
In this embodiment, a plurality of foundation piles 6 are disposed in the foundation pit, and the foundation piles 6 are embedded in the foundation concrete layer 1. In the construction, the foundation pile 6 needs to be subjected to pile breaking operation.
The aforesaid obviously can derive, the reinforced foundation fetal membrane structure that provides in this embodiment, it has the triangle-shaped reinforcing bar forming device of cement improved soil to set up a packing respectively through the both sides at the foundation pit, adopt the barricade fetal membrane of a triangle soil heap structure of cement soil and cement blanket formation, the intensity of both having guaranteed the fetal membrane has also completely cut off the invasion of groundwater to a certain extent, the application of cement blanket has played the wholeness that parcel cement improved soil made it when the loading, it is longer to have overcome the length that the foundation floor erected among the prior art, it is consuming time great, the masonry material uses unfavorable factor such as more, be favorable to guaranteeing construction quality, accelerate the construction progress and practiced thrift construction cost greatly.
Referring to fig. 4, the invention also provides a construction method of the reinforced foundation membrane, which comprises the following steps:
and step S1, after pile breaking and earthwork cleaning of the working surface around the foundation pit, performing concrete pouring on the foundation bed and tamping the raft surface base around the foundation pit.
Specifically, pile heads of foundation piles are broken, earthwork of a working surface of a foundation pit is cleaned, then foundation soil foundations and raft foundation soil foundations are tamped to form a foundation pit inner foundation soil tamped layer a and a foundation pit outer foundation soil tamped layer b, and concrete is poured on the foundation pit inner foundation soil tamped layer a to form a foundation concrete cushion layer.
And S2, inserting a plurality of first vertical steel bars into the foundation pit outer substrate soil compaction layer, binding a plurality of first transverse steel bars to form a steel bar mesh, and binding L-shaped steel bars on the steel bar mesh to form a right-angle steel bar support.
Specifically, the distance between the first vertical steel bars is 200-300mm, and the distance between the first transverse steel bars is 150-200 mm. The length of the first vertical reinforcing steel bar is less than 2 times of the height h of the foundation tire membrane. The specific arrangement of the first vertical steel bar, the first transverse steel bar and the L-shaped steel bar refers to the above device embodiment, and is not described herein again.
And step S3, filling cement improved soil in the right-angle steel bar support and tamping to form a triangular soil-piled retaining wall, and covering a cement blanket at the bevel edge of the triangular soil-piled retaining wall after watering and maintaining until the cement improved soil reaches a certain strength.
Specifically, a right-angled triangular soil-piled retaining wall with the length ratio of two sides being 1:1 is formed on a right-angled reinforcing steel bar support part formed by a reinforcing mesh and L-shaped reinforcing steel bars by adopting a manual forming and manual tamping method for the improved soil mixed with 7% -15% of cement, and after the cement improved soil reaches a certain strength, a watering self-hardening cement blanket is covered on the triangular soil-piled retaining wall. The thickness of the cement blanket is 10mm, the effects of covering and attractive forming are achieved, and the purpose of facilitating the subsequent pasting construction of the waterproof coiled material is achieved.
And step S4, inserting a second vertical reinforcing steel bar into the foundation pit outer base plain soil tamping layer to a certain depth along the end part of the foundation pit outer cement blanket, and welding a second transverse reinforcing steel bar with second vertical reinforcing steel bars at two ends to firmly lay the cement blanket.
Specifically, the cement blanket penetrates through the end portion of the triangular soil pile outside the foundation pit, the second vertical steel bars are hammered and inserted to a certain depth in the foundation soil tamping layer outside the foundation pit, the second transverse steel bars are arranged in the direction perpendicular to the second vertical steel bars, the second transverse steel bars are welded with the second vertical steel bars, and the second steel bars are hammered continuously after the welding is completed until the second transverse steel bars are paved, adhered and fixed with the cement blanket. In this embodiment, the depth of the second vertical steel bars and the depth of the first vertical steel bars inserted into the foundation soil rammed layer outside the foundation pit are the same, and are not smaller than the height of the foundation bed mould.
And step S5, after the cement blanket is cured, performing foundation pit outer raft foundation earthwork backfilling and tamping, and pouring concrete of a foundation pit outer cushion layer.
Specifically, after the cement blanket is watered and cured, foundation pit outer raft foundation earthwork backfilling and tamping are carried out according to the existing brick moulding bed construction procedure to form a foundation pit outer side portion soil tamping layer c, and pouring of foundation pit outer raft foundation bed base layer concrete is carried out to form a foundation pit outer concrete bed layer b.
And step S6, binding and pouring concrete with the waterproof layer, the waterproof protective layer and the reinforcing steel bars of the raft surface in the foundation pit.
Specifically, the waterproof layer and the waterproof protective layer are laid in the foundation pit in a concave shape, and the waterproof layer can be formed by laying waterproof rolls. The binding of the reinforcing steel bars on the raft surface d and the pouring of concrete in the foundation pit can be carried out by adopting the means of the prior art.
It can be seen that in this embodiment, a reinforced foundation membrane with high strength and good water resistance is formed by combining the anchoring reinforcing mesh support, the cement-modified soil and the self-hardening cement blanket and then performing the waterproof cover treatment.
In conclusion, the construction method of the reinforced foundation bed course provided by the invention adopts the cement soil and the cement blanket to form the retaining wall bed course with a triangular soil pile structure, thereby not only ensuring the strength of the bed course, but also isolating the invasion of underground water to a certain extent, the application of the cement blanket plays a role in wrapping the cement soil to ensure the integrity of the cement soil when being loaded, in addition, a smooth adhesive surface is provided for the construction of a subsequent waterproof layer, and the construction progress is greatly accelerated and the cost is saved by adopting the reinforced soil consolidation concept and the function of the cement blanket.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A reinforced foundation membrane structure, comprising: the waterproof structure comprises a foundation concrete cushion layer, a waterproof protective layer and two triangular steel bar forming devices; wherein,
the foundation concrete cushion layer, the waterproof layer and the waterproof protective layer are sequentially arranged in a laminated mode from the bottom of the foundation pit to the top; the contour of the waterproof layer and the waterproof protective layer is matched with the shape of the foundation pit; the two triangular reinforcing steel bar forming devices are symmetrically arranged on two sides of the foundation pit and are connected with the waterproof layer positioned on the side wall of the foundation pit; the two triangular steel bar forming devices are filled with cement improved soil, and cement blankets cover the outer sides of the triangular steel bar forming devices to form triangular soil pile retaining walls; the top of the foundation concrete cushion is level with the bottoms of the two triangular forming devices.
2. The reinforced base membrane structure according to claim 1, wherein the triangular forming means comprises: a right-angle steel bar support; wherein,
the cement blankets are obliquely erected between two sides of the right-angle steel bar support, the right-angle steel bar support and the cement blankets form a triangular area, and cement improved soil is filled in the triangular area to form a triangular soil pile retaining wall; one end of the cement blanket is certainly the triangle-shaped soil is piled outside extension of barricade bottom and is laid first length of predetermineeing, the other end of cement blanket certainly triangle-shaped soil is piled barricade top to basic concrete cushion top extends and is in basic concrete cushion top extends the second length of predetermineeing.
3. The reinforced base membrane structure according to claim 2, wherein the right-angle reinforcing bar support includes: a plurality of first vertical steel bars arranged at intervals, a plurality of first transverse steel bars arranged at intervals and a plurality of L-shaped steel bars arranged at intervals; wherein,
the bottom of each first vertical steel bar is inserted into the foundation soil tamping layer outside the foundation pit and is crossed with each first transverse steel bar to form a net structure; each L-shaped steel bar is arranged between two adjacent first vertical steel bars, one side, with the longer length, of each L-shaped steel bar is arranged in parallel with each first vertical steel bar, and one side, with the shorter length, of each L-shaped steel bar is arranged on the plane where the top of the foundation concrete cushion layer is located along the horizontal direction.
4. The reinforced base membrane structure according to claim 3, wherein the triangular forming means further comprises: the second transverse steel bars and the plurality of second vertical steel bars; wherein,
each second vertical steel bar is inserted into the foundation pit outer base plain soil tamping layer from the surface of the cement blanket, and the second transverse steel bars are connected with each second vertical steel bar; one end, far away from the first vertical steel bar, of the side, with the shorter length, of each L-shaped steel bar is connected with each second vertical steel bar; and the second transverse reinforcing steel bars are paved at the bottom of the cement blanket.
5. A construction method of a reinforced foundation membrane structure is characterized by comprising the following steps:
step 1, after pile breaking is completed and earthwork of a working surface at the periphery of a foundation pit is cleaned, concrete pouring is carried out on a foundation cushion layer and a raft surface base around the foundation pit is tamped;
step 2, inserting a plurality of first vertical steel bars into the foundation pit outer base soil compaction layer, binding a plurality of first transverse steel bars to form a steel bar mesh, and binding L-shaped steel bars on the steel bar mesh to form a right-angle steel bar support;
step 3, filling cement improved soil in the right-angle steel bar support and tamping to form a triangular soil pile retaining wall, and covering a cement blanket at the bevel edge of the triangular soil pile retaining wall after watering and maintaining until the cement improved soil reaches a certain strength;
step 4, inserting a second vertical reinforcing steel bar into the foundation pit outer base plain soil tamping layer along the end part of the foundation pit outer cement blanket to a certain depth, and welding a second transverse reinforcing steel bar with second vertical reinforcing steel bars positioned at two ends so as to firmly lay and attach the cement blanket;
step 5, after the cement blanket is cured, performing foundation pit outer raft foundation earthwork backfilling and tamping and foundation pit outer cushion layer concrete pouring;
and 6, binding and pouring concrete with the waterproof layer and the waterproof protective layer of the raft surface and the reinforcing steel bars in the foundation pit.
6. The construction method of the ribbed foundation fetal membrane structure as claimed in claim 5, wherein in the step 2, the distance between the first vertical steel bars is 200-300mm, and the distance between the first transverse steel bars is 150-200 mm.
7. The construction method of the reinforced base membrane structure according to claim 5, wherein the length of the first vertical reinforcing bars is greater than the height of the base membrane and less than 2 times the height of the base membrane.
8. The construction method of the reinforced foundation membrane structure according to claim 5, wherein the second vertical reinforcing bars are inserted into the foundation pit outer base plain soil compacted layer to the same depth as the first vertical reinforcing bars.
9. The method for constructing a reinforced foundation membrane structure according to claim 5, wherein in step 4, the second vertical reinforcing bars at two ends are hammered continuously after the second transverse reinforcing bars and the second vertical reinforcing bars are welded, so that the cement blanket is firmly attached.
10. The construction method of the reinforced foundation membrane structure according to claim 5, wherein the second vertical reinforcing bars are inserted into the foundation pit outer base plain soil compacted layer to the same depth as the first vertical reinforcing bars.
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| CN116084427A (en) * | 2022-12-26 | 2023-05-09 | 北京市第三建筑工程有限公司 | Construction method of raft inner foundation pit for water-rich foundation in quicksand layer |
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