CN109736323A - A kind of frequency conversion soil nail wall and its method for protecting support - Google Patents
A kind of frequency conversion soil nail wall and its method for protecting support Download PDFInfo
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- CN109736323A CN109736323A CN201910026238.4A CN201910026238A CN109736323A CN 109736323 A CN109736323 A CN 109736323A CN 201910026238 A CN201910026238 A CN 201910026238A CN 109736323 A CN109736323 A CN 109736323A
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Abstract
The invention discloses a kind of frequency conversion soil nail wall and its method for protecting support, it include side slope soil layer, it is implanted with multiple rows of soil nailing from the top down in the side slope soil layer, density of the soil nailing on each row is gradually increased downwards, the end of the soil nailing is stretched out from side slope soil layer surface and is connected with steel mesh, a layer concrete surface layer is laid on the steel mesh, the thickness of the concrete topping is gradually increased from the top down, the side slope soil layer includes at inner corner trim and at external corner, inner corner trim point of the bar planting density of every casting nail from centre to two sides gradually becomes smaller at the inner corner trim, external corner point of the bar planting density of every casting nail from centre to two sides becomes larger at the external corner, the bar planting density of every casting nail at the external corner of sustained height is less than the bar planting density of every casting nail at inner corner trim.Difference of the present invention according to slope surface by stress can more reasonably distribute the density of soil nailing, improve the supporting intensity of soil nail wall, reduce waste.
Description
Technical field
The present invention relates to the technical fields of construction, more particularly, to a kind of frequency conversion soil nail wall and its method for protecting support.
Background technique
Soil nail wall is a kind of soil body reinforcement technology in situ.Excavation slope is reinforced the soil nailing made of reinforcing bar,
Side slope surface is laid with the slope reinforcement type supporting construction side that one of steel mesh fill-before-fire, one layer of concrete surface layer and earthwork side slope combine
Method.It is configured to be arranged in the reinforcement rod piece (i.e. soil nailing or anchor pole) in slopes formed with its surrounding soil secure bond it is compound
The supporting construction for the similar Form Gravity Breast Wall that body and surface layer are constituted.
For general simple pattern foundation pit supporting structure, the most conventional simple method of support for being no more than soil nail wall.But often
It advises in technique, for corresponding design calculating and construction, the gap length arrangement of reinforcement of same casting nail is identical, face in the same foundation pit
The problem of horizontal and longitudinal soil nailing calculates and does not distinguish, cause in this way on constructing:
1, far and near different away from inner corner trim, the stress of the soil body does not fully consider, causes to waste, and soil property and localized variation do not account for,
Leave hidden danger.Soil stress localized variation caused by the variation of side slope flat shape is not distinguished, and is imposed uniformity without examining individual cases, big for stress has
Hidden danger, stress it is small have waste.
2, part consistent with monolithic floor surface thickness way under slope on slope, small for slope top stress is waste, under
Portion is hidden danger, not scientific, does not accomplish Fine design, construction.
3, Normal practice is as illustrated in fig. 1 and 2, and every casting nail spacing is identical, and thickness is identical up and down for slopes, and no differentiation is set
Meter, causes very big waste.
Summary of the invention
The object of the present invention is to provide a kind of frequency conversion soil nail wall and its method for protecting support, the difference according to slope surface by stress,
The density that soil nailing can more reasonably be distributed improves the supporting intensity of soil nail wall, reduces waste.
Foregoing invention purpose of the invention has the technical scheme that
A kind of frequency conversion soil nail wall includes side slope soil layer, is implanted with multiple rows of soil nailing, the soil in the side slope soil layer from the top down
The density followed closely on each row is all different, and steel mesh, institute are stretched out and be connected in the end of the soil nailing from side slope soil layer surface
It states and is laid with a layer concrete surface layer on steel mesh, the thickness of the concrete topping is gradually increased from the top down.
By using above-mentioned technical proposal, the stress of excavation slope upper soil horizon is smaller, is implanted into the soil nailing of smaller density, no
It needs to be implanted into soil nailing excessively to damage to the soil body, the stress of excavation slope lower part soil layer is larger, is implanted into the soil of greater density
Nail, can be applied to the bigger pulling force of soil nailing, can make full use of the stress of the lower part soil body by being implanted into more soil nailings, keep away
Exempt to waste；Concrete topping thickness is gradually increased downwards, and the stress of side slope upper soil horizon is small, pulling force of the concrete topping to the soil body
Also smaller, soil structures are protected, the stress of side slope lower part soil layer is big, and concrete topping is also larger to the pulling force of the soil body, avoids soil
The waste of body stress.
The present invention is further arranged to: the side slope soil layer includes every casting nail at the inner corner trim at inner corner trim and at external corner
Inner corner trim point of the bar planting density from centre to two sides gradually become smaller.
Different according to the stress of slope surface at inner corner trim by using above-mentioned technical proposal, the reasonable density for distributing soil nailing subtracts
Little waste.
The present invention is further arranged to: at the external corner external corner point of the bar planting density of every casting nail from centre to two sides by
Gradual change is big, and the bar planting density of every casting nail at the external corner of sustained height is less than the bar planting density of every casting nail at inner corner trim.
It is different according to the stress of slope surface at external corner by using above-mentioned technical proposal, the reasonable density for distributing soil nailing, and
Cooperated at inner corner trim, improve the utilization rate of resistance to shear of soil, reduces the waste of soil nailing.
The present invention is further arranged to: the position that the end of soil nailing described in every row is pierced by side slope soil layer surface is fixed with transverse direction
Reinforcing rib, the cross reinforcing are weldingly fixed on steel mesh.
By using above-mentioned technical proposal, casting nail is connected by an entirety by cross reinforcing, enhances soil
Interaction relation between nail, the case where avoiding a soil nailing loosening and fall, cross reinforcing and steel mesh are welded, and enhance steel
The being completely embedded property and bonding strength of muscle net and side slope soil layer.
The present invention is further arranged to: the cross reinforcing is arranged between side slope soil layer and steel mesh, the side slope
The gap of gunite concrete surface layer is formed between soil layer and steel mesh.
It by using above-mentioned technical proposal, in gunite concrete, is at steel mesh inside concrete topping, increases
The structural strength of reinforced concrete surface layer keeps concrete topping closer and is bonded with side slope soil layer.
The present invention is further arranged to: the napex of the side slope soil layer is provided with the concrete water blocking that a circle surrounds foundation pit
Platform.
By using above-mentioned technical proposal, the water outside foundation pit can be stopped to flow into foundation pit by water blocking platform, avoid base
It cheats inner product dilutional hyponatremia and damages foundation pit internal structure.
The present invention is further arranged to: the bottom of the side slope soil layer is provided with the gutter that a circle surrounds foundation pit.
By using above-mentioned technical proposal, the ponding in foundation pit can be quickly discharged, be avoided in foundation pit by gutter
Structure impregnated and be damaged for a long time.
A kind of method for protecting support of frequency conversion soil nail wall disclosed by the invention, which comprises the following steps:
Side slope is segmented by step 1, and the stress analysis for carrying out some single soil nailing point calculates, and calculates answering for same casting nail in this way
Power variation, closer apart from inner corner trim point, the pulling force of soil nailing is smaller, and the intermediate point of a side slope section reaches maximum, soil nailing bar planting density
It is bigger；Closer apart from external corner point, the pulling force of soil nailing is bigger, and the intermediate point of a side slope section reaches minimum, and soil nailing bar planting density is got over
It is small；
Step 2, according to calculated result, resist soil nailing with the electric hammer front end powered on side slope soil layer, starting electric hammer is to base
Force feed soil nailing in side slope soil layer is cheated, until soil nailing protruded length is 200-500mm, is got over closer to Foundation Pit subsoil nail protruded length
Greatly；
Step 3 is welded with cross reinforcing close to the position on side slope soil layer surface in the upside of same casting nail or downside,
The gap of 30-60mm is set between cross reinforcing and side slope soil layer；
Step 4 is laid with steel mesh on side slope soil layer surface in longitudinally and laterally away, and steel mesh is welded on cross reinforcing
On；
Step 5, the gunite concrete into steel mesh, the bottom-up injection of when injection, jet thickness is bottom-up to be gradually reduced, spray
Concrete topping is formed after the completion of penetrating, and concrete topping is smoothed out, the gradient of concrete topping is calculated, with side slope soil layer
The gradient compares, and the gradient less than side slope soil layer then meets the requirements, and otherwise needs to continue to spray in concrete topping lower part
It penetrates and thickens, then carry out floating and re-start comparison；
Step 6 conserves concrete topping.
In conclusion advantageous effects of the invention are as follows:
1, the present invention, first according to stress distribution situation in side slope soil layer, is implanted into different frequency and density before carrying out soil nailing implantation
Soil nailing, the stress that can make full use of soil layer provides the pulling force that applies to soil nailing, can effectively avoid soil nailing pulling force excessive two
Soil layer construction is damaged, it is too small and waste soil layer stress also to can be avoided soil nailing pulling force.
2, concrete topping is arranged to the structure that thickness is gradually increased downwards, concrete topping upper thickness by the present invention
Small, small for side slope top stress part avoids the waste of concrete, and concrete topping lower part thickness is big, under side slope
The big part of portion's stress, side slope provide stronger supporting intensity.
Detailed description of the invention
Fig. 1 is the supporting elevation of soil nail wall in the prior art.
Fig. 2 is the supporting construction figure of soil nail wall in the prior art.
Fig. 3 is the floor map of slope protection in the present invention.
Fig. 4 is the supporting construction figure of soil nail wall in the present invention.
Fig. 5 is the facade view in Fig. 3 at 1-1.
Fig. 6 is the facade view in Fig. 3 at 2-2.
Fig. 7 is the supporting sectional view of soil nail wall in the present invention.
In figure, 1, side slope soil layer；11, at inner corner trim；12, at external corner；2, soil nailing；3, steel mesh；31, veil layer；32, triangle
Shape support frame；33, support rod；34, fixing anchor bar；4, concrete topping；5, cross reinforcing；6, water blocking platform；7, gutter.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Referring to Fig. 3 and 4, it is a kind of frequency conversion soil nail wall disclosed by the invention, includes side slope soil layer 1, soil nailing 2 and concrete
The structures such as surface layer 4.Wherein, side slope soil layer 1 is obliquely installed to bottom of foundation ditch, is implanted with multiple rows of soil in side slope soil layer 1 from the top down
Nail 2, soil nailing 2 use reinforcement rod, and implantation direction is perpendicular to the surface layer of side slope soil layer 1, and the spacing of every casting nail 2 is identical, same row
The implant density of middle soil nailing 2 is different, and the end of soil nailing 2 is exposed from the surface of side slope soil layer 1, and the protruded length of soil nailing 2 is 200-
500mm, the exposed length of every casting nail 2 becomes larger from the top down.
The surface layer of side slope soil layer 1 is injected with a layer concrete surface layer 4, carrys out side slope soil layer 1 and is reinforced, and soil nailing 2 is from mixed
The surface of solidifying soil surface layer 4 is pierced by 100mm, and the thickness of concrete topping 4 is gradually increased from the top down, makes the cross of concrete topping 4
Section is tapered.The stress of side slope upper soil horizon is small, and concrete topping 4 is also smaller to the pulling force of the soil body by soil nailing 2, by coagulation
Native 4 top of surface layer is arranged relatively thin, can protect soil structures；The stress of side slope lower part soil layer is big, and concrete topping 4 passes through soil
The pulling force for following closely 2 pairs of soil bodys is also larger, by the thicker of 4 lower part of concrete topping setting, provide stronger supporting intensity, avoids the soil body
The waste of stress.
A circle is provided on the napex ground of side slope soil layer 1 by the water blocking platform 6 of concreting, water blocking platform 6 surrounds foundation pit
Edge one week, the water outside foundation pit can be stopped to flow into foundation pit, foundation pit inner product dilutional hyponatremia is avoided and damage foundation pit internal junction
Structure.The surrounding that the bottom of side slope soil layer 1 is located at hole bottom is provided with a circle gutter 7, and gutter 7 is enclosed around the hole bottom one of foundation pit,
Defluent flowing water on ponding and concrete topping 4 in foundation pit can be discharged quickly through gutter 7, be avoided in foundation pit
Structure is impregnated for a long time and is damaged.
In the present embodiment soil nail wall carry out section construction, side slope soil layer 1 include spaced inner corner trim at 11 and external corner at
12。
It is at inner corner trim 11 facade structures referring to Fig. 5, the density of each casting nail 2 is different, the soil nailing 2 of intermediate row
Density is greater than 2 density of soil nailing of upper row and lower row.Pulling force apart from the nearlyr soil nailing 2 of inner corner trim point is smaller, more remoter bigger, a side slope
The intermediate point of section reaches maximum, and inner corner trim point of the bar planting density of every casting nail 2 from each section of intermediate point to two sides gradually becomes smaller.
Steel mesh 3 is stretched out from 1 surface of side slope soil layer and be connected in the end of soil nailing 2, and concrete topping 4 is by concrete ejection
It is formed on steel mesh 3.Steel mesh 3 includes the veil layer 31 in plane and is fixed on veil layer 31 in side slope soil layer 1
Multiple triangle support frames 32 of side, multiple triangle support frames 32 are parallel and contour installation.Wherein, veil layer 31 by transverse bar and
Vertical muscle binds to be formed, and prevents veil layer part from collapsing inwardly, 32 upper end edge side slope soil layer 1 of triangle support frame it is longitudinal to one
Side is obliquely installed, i.e. the transverse bar and vertical muscle angle at an acute angle of triangle support frame 32 and veil layer 31.
The position that the end of every casting nail 2 is pierced by 1 surface of side slope soil layer is fixed with cross reinforcing 5, and cross reinforcing 5 welds
The upper side for being fixed on same casting nail 2 is connect, while cross reinforcing 5 is also weldingly fixed on steel mesh 3.Cross reinforcing 5
It is arranged between side slope soil layer 1 and steel mesh 3, and forms the gap of 30mm, cross reinforcing 5 from three between side slope soil layer 1
It is passed through inside angular support frame 32, forms the gap of gunite concrete surface layer 4 between side slope soil layer 1 and steel mesh 3.
It is at external corner 12 facade structures referring to Fig. 6, the density of each casting nail 2 is different, the soil nailing 2 of intermediate row
Density is greater than 2 density of soil nailing of upper row and lower row.Pulling force apart from the nearlyr soil nailing 2 of external corner point is bigger, more remote smaller, a side slope
The intermediate point of section reaches minimum, and external corner point of the bar planting density of every casting nail 2 from intermediate point to two sides becomes larger, sustained height
External corner at the 12 bar planting density of every casting nail 2 be less than the bar planting density of 11 every castings nails 2 at inner corner trim.
Referring to Fig. 7, triangle support frame 32 is right angled triangle, and long right-angle side is fitted in 1 surface of side slope soil layer, triangle
Upward, lower end is set as supporting veil layer 31 to the support rod 33 propped up far from 1 direction of side slope soil layer at the tip of support frame 32
Bar 33 is bonded and is welded on the bevel edge of triangle support frame 32, cross reinforcing perpendicular to 1 surface of side slope soil layer, veil layer 31
5 are weldingly fixed on triangle support frame 32.It welds at the right-angle side both ends that triangle support frame 32 is bonded with 1 surface of side slope soil layer
It connects and is fixed with a fixing anchor bar 34, fixing anchor bar 34 is vertically plugged in side slope soil layer 1, by triangle support frame 32 and side slope
Soil layer 1 is fixed.At gunite concrete surface layer 4,4 inside of concrete surface layer is bonded with 1 surface of side slope soil layer, outside and veil layer
31 is parallel.
The invention discloses a kind of method for protecting support of frequency conversion soil nail wall, comprising the following steps:
Side slope is segmented by step 1, and the stress analysis for carrying out some single soil nailing point calculates, and calculates answering for same casting nail 2 in this way
Power variation, closer apart from inner corner trim point, the pulling force of soil nailing 2 is smaller, and the intermediate point of a side slope section reaches maximum, and 2 bar planting of soil nailing is close
It spends bigger；Closer apart from external corner point, the pulling force of soil nailing 2 is bigger, and the intermediate point of a side slope section reaches minimum, and 2 bar planting of soil nailing is close
It spends smaller.
Step 2, according to calculated result, resist soil nailing 2 with the electric hammer front end powered on side slope soil layer 1, starting electricity
The force feed soil nailing 2 into excavation slope soil layer 1 is hammered into shape, until 2 protruded length of soil nailing is 200-500mm, closer to Foundation Pit subsoil nail 2
Protruded length is bigger.
32 welt slope soil layer of triangle support frame, 1 surface is tilted 30 degree by step 3 along longitudinal direction, is fixedly plugged in side slope soil
1 surface of layer is laid with cross reinforcing 5, cross reinforcing 5 close to the position on 1 surface of side slope soil layer in the upside of same casting nail 2
The gap of 30mm is set between side slope soil layer 1, cross reinforcing 5 is respectively welded on soil nailing 2 and triangle support frame 32.
Step 4, on the triangle support frame 32 on 1 surface of side slope soil layer along side slope soil layer 1 vertical and horizontal be laid with
Veil layer 31, and veil layer 31 is welded on triangle support frame 32.
Step 5, the gunite concrete into steel mesh 3, the bottom-up injection of when injection, jet thickness is bottom-up gradually to be subtracted
It is small, concrete topping 4 is formed after the completion of injection, concrete topping 4 is smoothed out, and the gradient of concrete topping 4 is calculated, with side
The gradient of slope soil layer 1 compares, and the gradient less than side slope soil layer 1 then meets the requirements, and otherwise needs in 4 lower part of concrete topping
Continue injection to thicken, then carries out floating and re-start comparison.
Step 6 conserves concrete topping 4.
The calculation formula that active earth pressure calculates in the present invention:
Q- ground load (kN)；
γ-soil severe (kN/m3), take 19kN/m3；
C- soil layer cohesive strength (kPa), 15kPa；
Soil layer internal friction angle (°), 10 °.
KaCoefficient of active earth pressure,
From up to each point soil pressure distribution:
1) 1. slope surface point locates soil pressure: h1=2.0m
2) 2. slope surface point locates soil pressure: h1=5.0m.
3) 3. slope surface point locates soil pressure: h1=8.0m.
Increased by calculating discovery side slope with depth, suffered by side slope
Soil pressure be gradually increased.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of frequency conversion soil nail wall, it is characterised in that: include side slope soil layer (1), planted from the top down in the side slope soil layer (1)
Enter to have multiple rows of soil nailing (2), density of the soil nailing (2) on each row is all different, and the end of the soil nailing (2) is native from side slope
Layer (1) surface is stretched out and is connected with steel mesh (3), and a layer concrete surface layer (4), the coagulation are laid on the steel mesh (3)
The thickness of native surface layer (4) is gradually increased from the top down.
2. a kind of frequency conversion soil nail wall according to claim 1, it is characterised in that: the side slope soil layer (1) includes at inner corner trim
(11) and at external corner (12), (11) every casting follows closely inner corner trim point of the bar planting density of (2) from centre to two sides gradually at the inner corner trim
Become smaller.
3. a kind of frequency conversion soil nail wall according to claim 2, it is characterised in that: (12) every casting nail (2) at the external corner
External corner point of the bar planting density from centre to two sides become larger, the plant of every casting nail (2) of (12) at the external corner of sustained height
Muscle density is less than the bar planting density of every casting nail (2) at inner corner trim (11).
4. a kind of frequency conversion soil nail wall according to claim 1, it is characterised in that: the end of soil nailing described in every row (2) is pierced by
The position on side slope soil layer (1) surface is fixed with cross reinforcing (5), and the cross reinforcing (5) is weldingly fixed on steel mesh (3)
On.
5. a kind of frequency conversion soil nail wall according to claim 4, it is characterised in that: the cross reinforcing (5) is arranged on side
Between slope soil layer (1) and steel mesh (3), gunite concrete surface layer (4) are formed between the side slope soil layer (1) and steel mesh (3)
Gap.
6. a kind of frequency conversion soil nail wall according to claim 1, it is characterised in that: the top of the side slope soil layer (1) is arranged
There is a circle to surround the concrete water blocking platform (6) of foundation pit.
7. a kind of frequency conversion soil nail wall according to claim 1, it is characterised in that: the bottom of the side slope soil layer (1) is arranged
There is a circle to surround the gutter (7) of foundation pit.
8. a kind of method for protecting support of frequency conversion soil nail wall, which comprises the following steps:
Side slope is segmented by step 1, and the stress analysis for carrying out some single soil nailing point calculates, and calculates same casting nail (2) in this way
Stress variation, closer apart from inner corner trim point, the pulling force of soil nailing (2) is smaller, and the intermediate point of a side slope section reaches maximum, soil nailing (2)
Bar planting density is bigger；Closer apart from external corner point, the pulling force of soil nailing (2) is bigger, and the intermediate point of a side slope section reaches minimum, soil nailing
(2) bar planting density is smaller；
Step 2, according to calculated result, resisted soil nailing (2) on side slope soil layer (1) with the electric hammer front end powered on, starting electricity
The force feed soil nailing (2) in excavation slope soil layer (1) is hammered into shape, until soil nailing (2) protruded length is 200-500mm, closer to Foundation Pit
It is bigger that subsoil follows closely (2) protruded length；
Step 3 is welded with transverse direction close to the position on side slope soil layer (1) surface in the upside of same casting nail (2) or downside
The gap of 30-60mm is arranged in reinforcing rib (5) between cross reinforcing (5) and side slope soil layer (1)；
Step 4 is laid with steel mesh (3) in longitudinally and laterally away on side slope soil layer (1) surface, and steel mesh (3) is welded on cross
To on reinforcing rib (5)；
Step 5, to steel mesh (3) interior gunite concrete, the bottom-up injection of when injection, jet thickness is bottom-up gradually to be subtracted
It is small, concrete topping (4) are formed after the completion of injection, concrete topping (4) is smoothed out, calculate the slope of concrete topping (4)
Degree, compares with the gradient of side slope soil layer (1), and the gradient for being less than side slope soil layer (1) then meets the requirements, and otherwise needs in coagulation
Native surface layer (4) lower part continues injection and thickens, and then carries out floating and re-starts comparison；
Step 6 conserves concrete topping (4).
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Address after: 050000 room 2201, Binjiang Yougu building, No. 3, xiumen street, Qiaoxi District, Shijiazhuang City, Hebei Province Applicant after: Zhongdi Zhicheng Construction Technology Co., Ltd Address before: Room 1-2803, Binjiang Business Building, 158 Shandong Road, Qiaoxi District, Shijiazhuang City, Hebei Province, 050000 Applicant before: HEBEI ZHONGDI ZHICHENG FOUNDATION ENGINEERING Co.,Ltd. |
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Application publication date: 20190510 |