CN104746520A - Shallow-to-deep foundation pit supporting structure and method - Google Patents
Shallow-to-deep foundation pit supporting structure and method Download PDFInfo
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- CN104746520A CN104746520A CN201510094237.5A CN201510094237A CN104746520A CN 104746520 A CN104746520 A CN 104746520A CN 201510094237 A CN201510094237 A CN 201510094237A CN 104746520 A CN104746520 A CN 104746520A
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention discloses a shallow-to-deep foundation pit supporting structure and method. The shallow-to-deep foundation pit supporting structure comprises a reinforced concrete internal supporting structure used for a deep foundation pit constructed at the later stage, a reinforced concrete bracket support and an H-shaped steel framework, wherein one end of the reinforced concrete internal supporting structure and one end of the reinforced concrete bracket support are both close to a shared shallow-to-deep foundation pit building outer wall, the H-shaped steel framework penetrates through the shared shallow-to-deep foundation pit building outer wall, one end of the H-shaped steel framework is connected to the interior of the reinforced concrete internal supporting structure, and the other end of the H-shaped steel framework is connected to the interior of the reinforced concrete bracket support; the other end of the reinforced concrete bracket support and a shallow foundation base plate are connected and are constructed at the same time; a waterstop steel plate is welded to the outer side of the H-shaped steel framework penetrating through the shared building outer wall. According to the shallow-to-deep foundation pit supporting structure, the whole construction time is short, a construction site is spacious, and materials can be transported and piled conveniently; meanwhile, the requirements for investing capitals in batches and putting commercial residential buildings in to the market by stages of construction units can be met.
Description
Technical field
The present invention relates to a kind of for first shallow rear dark foundation pit supporting construction and its implementation, belong to the technical field of geotechnical engineering.
Background technology
In recent years, China's building is built day by day prosperous, and underground construction is risen rapidly, and Construction of Basement area is increasing.Because of different with functional performance of planning, Large Underground Structure is not disposable exploitation, and the basement number of plies is also not all identical.Conventional design of foundation pit and construction are all carried out according to the working procedure of " first dark rear shallow ", large-area deep foundation pit engineering is as taked the conventional method of " first dark rear shallow ", the whole duration of a project is long, and construction plant is narrow and small, constructional materials is stacked nowhere, and the earthwork digs freight volume greatly, and transport of materials is subject to serious impact, the fund simultaneously not reaching Construction unit's requirement drops in batches, the dreamboat that the commercial house puts goods on the market by stages.
The working procedure of " first dark after shallow " can not meet the demand of planning and business, on the contrary according to " first shallow rear dark " mode carry out becoming a kind of new form.In various places deep pit digging and support technology, experienced by dark and shallow design and construction mode, but for " first shallow rear dark " the less application of this new form of construction work.Shallow foundation of first constructing is cheated, foundation ditch is built near especially after making first to build basement structure edge distance, build foundation pit construction after giving and bring very large difficulty, also bring larger danger to first building basement agent structure simultaneously, correspondingly increase duration and operating expenses, simultaneously to after build foundation pit construction precision requirement increase.Build the actual conditions of deep pit digging and supporting and protection structure after the intensity of foundation pit supporting construction and construction technology do not meet if first build, then easily cause some base pit engineerings to occur accident, cause damage.
Comprehensive various factors analysis, if the form of construction work reasonably taking " first shallow rear dark ", meet the precision of foundation ditch and the requirement of intensity, then the benefit of this form of construction work is given prominence to.The present invention considers first excavation B1 region foundation ditch in early stage, after advance works puts goods on the market, then excavates later stage underground two layer region, finally connects through by two storehouses, phase ground.
Summary of the invention
Goal of the invention: for problems of the prior art with not enough, the invention provides a kind of for first shallow rear dark foundation pit supporting construction and method, build that support stiffness used is large, form of structure is simple, speed of application is fast, energy-conserving and environment-protective the supporting and protection structure later stage that the present invention realizes.After supporting and protection structure of the present invention terminates for shallow foundation pit construction in early stage; later stage deep foundation ditch inner support supports stress point at depth boundary and cannot arrange; the situation of effective drag cannot be provided; can meet and support resistance points is rationally set; guarantee the integrality of later stage inner support; meet the protection requirement of later stage foundation pit construction process to environment, do not affect the safe handling of built basement in early stage simultaneously.
Technical scheme: a kind of for first shallow rear dark foundation pit supporting construction, described foundation pit supporting construction comprises builds deep foundation pit reinforced concrete inner supporting structure for the later stage, Reinforced Concrete Corbels bearing, and H profile steel skeleton; One end of described reinforced concrete inner support structure and Reinforced Concrete Corbels bearing all shares external wall by depth foundation ditch and arranges; Described H profile steel skeleton shares external wall through depth foundation ditch, and one end is connected to reinforced concrete inner support inside configuration, and it is inner that the other end is connected to Reinforced Concrete Corbels bearing; The other end of Reinforced Concrete Corbels bearing and shallow-layer sole plate link together to construct simultaneously and form; Steel plate for sealing water is welded with outside the described H profile steel skeleton through shared external wall.
Described reinforced concrete inner support structure comprises many reinforced concrete inner supports, every root reinforced concrete inner support inside is provided with a H profile steel skeleton, H profile steel skeleton comprises the Ф 19 socket cap high strength shearing resistance pin that uniform section 400 × 400 shaped steel and the edge of a wing thereof are welded, H profile steel skeleton one end is embedded in reinforced concrete inner support inside, it is inner that the other end is embedded in Reinforced Concrete Corbels bearing, Ф 19 socket cap high strength shearing resistance pin be arranged on be embedded in the inner and Reinforced Concrete Corbels bearing inside of reinforced concrete inner support the H profile steel skeleton edge of a wing on, play shearing resistance effect.
Described reinforced concrete inner support is made up of jointly vertical internal rod and horizontal hoop and concrete three.
Described Reinforced Concrete Corbels bearing is made up of with horizontal hoop and concrete three jointly top Reinforcement (vertical muscle).
Realize an above-mentioned construction method for first shallow rear dark foundation pit supporting construction, build the inner support of deep foundation ditch for later stage institute, and this inner support axle power load is delivered in earlier stage on shallow-layer sole plate.Early stage, large area sole plate served the effect of balanced support horizontal force preferably, ensure that the stable of support system.Support crossing structure exterior wall position and play transitional function by arranging H profile steel skeleton.Comprise the steps:
The first step: according to the requirement of actual conditions, foundation ditch first excavates B1 region, rear excavation underground two layer region;
Second step: Reinforced Concrete Corbels is set according on the B1 base plate (i.e. shallow-layer sole plate) that sequence of construction need formerly be constructed, Reinforced Concrete Corbels bearing is embedded in advance inner through the H profile steel skeleton one end sharing external wall, during lower two layers of construction ground, two layers, underground reinforced concrete inner support is connected with concrete bracket by the other end of pre-buried H profile steel skeleton;
3rd step: concrete bracket, pre-buried H profile steel skeleton are poured into a mould together with B1 base plate; Before casting reinforced concrete bracket, the necessary accurately unwrapping wire of unit in charge of construction, checks the position that two layers, underground supports, guarantees that concrete bracket and pre-buried shaped steel support with two layers, underground and be connected like clockwork, can implement.
4th step: while removing the support of two layers, underground, cut Reinforced Concrete Corbels.When cutting reinforced concrete bracket, answering subregion, jumping every cutting, and should adopt and manually slowly cut, avoid affecting agent structure.
5th: after cutting, according to Structural Design Requirement leveling sole plate.
Described H profile steel component and reinforced concrete inner support can in concert with work.Ф 19 high strength cylindrical pin is welded on the edge of a wing being embedded in the H profile steel in Reinforced Concrete Corbels, plays shearing resistance effect.
H profile steel component interts in concrete inner support and concrete bracket, the horizontal hoop meeting Code for design of concrete structures requirement should be set along H profile steel length, to retrain eccentric force to concrete adverse effect, strengthen the adhesion stress between reinforcing bar and concrete, section steel flange arranged outside socket cap high strength shearing resistance pin simultaneously in axial force of the supports larger portion position, prevent from producing Relative sliding between type Steel concrete, cause support system unstability.Shaped steel termination arranges the quantity of peg, can calculate the shear stress of section steel flange outer surface, corresponding to the shearing of this shear stress, all be born by peg, the concrete quantity n of shaped steel shear stud according to elastic method
stemploying following formula calculates:
n
st＝V
st/N
st
In formula: V
stfor the horizontal shear design load that bottom flange peg on shaped steel bears; N
stfor single peg shear resistance capacity; A
stfor peg nail bar section area; E
c, f
cbe respectively modulus of elasticity of concrete and the axial compressive strength design load of Reinforced Concrete Corbels bearing; f
st ufor the ultimate tensile strength minimum value of peg steel.
The described H profile steel through party wall welds steel plate for sealing water outside it can solve the requirement of structure outer to waterproof effectively.
The present invention adopts technique scheme, and tool has the following advantages compared with existing conventional art:
In the deep-foundation pit engineering of 1, formerly shallow rear deep placement work, efficiently solve the offering question of later stage inner support system resistance points, and the difficult problem that shearing resistance shaped steel solves concrete support crossing structure exterior wall is set.
2, the transmission of the horizontal force that the inner support effectively solving construction in later period of Reinforced Concrete Corbels and member in shear memory is caused in downward digging process and equilibrium problem.
3, adopt described supporting and protection structure, foundation pit construction speed is fast, and soil excavation is convenient, and little to surrounding environment influence, operating efficiency is high, and engineering cost is low, is particularly useful for adopting first shallow rear dark deep-foundation pit engineering.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is H profile steel schematic cross-section;
Fig. 3 is foundation pit supporting construction foundation ditch generalized section of the present invention;
In figure, 1, shallow-layer sole plate 2, reinforced concrete inner support 3, depth foundation ditch share external wall 4, H profile steel skeleton 5, Reinforced Concrete Corbels bearing 6, high strength shearing resistance pin 7, steel plate for sealing water 8, vertical muscle 9, horizontal hoop in deep foundation ditch.
Detailed description of the invention
Below in conjunction with specific embodiment, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
As shown in Figure 1-2, for first shallow rear dark foundation pit supporting construction, comprise for the later stage build the reinforced concrete inner support structure of deep foundation ditch, Reinforced Concrete Corbels bearing 5, and H profile steel skeleton 4; Reinforced concrete inner support structure comprises many reinforced concrete inner supports 2, every root reinforced concrete inner support 2 inside is provided with a H profile steel skeleton 4, and an end of reinforced concrete inner support structure and Reinforced Concrete Corbels bearing 5 all shares external wall 3 by depth foundation ditch and arranges; H profile steel skeleton 4 shares external wall 3 through depth foundation ditch, and it is inner that one end is connected to reinforced concrete inner support 2, and it is inner that the other end is connected to Reinforced Concrete Corbels bearing 5; The other end of Reinforced Concrete Corbels bearing 5 and shallow-layer sole plate 1 link together to construct simultaneously and form; Reinforced concrete inner support 2, the H profile steel skeleton sharing external wall 3 through depth foundation ditch and Reinforced Concrete Corbels bearing 5 are connected to form whole supporting and protection structure, are welded with steel plate for sealing water 7 outside H profile steel skeleton 4.
H profile steel skeleton 4 comprises the Ф 19 socket cap high strength shearing resistance pin 6 that uniform section 400 × 400 shaped steel and the edge of a wing thereof are welded, Ф 19 socket cap high strength shearing resistance pin 6 be arranged on be embedded in inner and Reinforced Concrete Corbels bearing 5 inside of reinforced concrete inner support 2 section steel flange on, play shearing resistance effect.
Reinforced concrete inner support 2 is made up of jointly vertical internal rod 8 and horizontal hoop 9 and concrete three.
Reinforced Concrete Corbels bearing 5 is made up of with horizontal hoop 9 and concrete three jointly vertical internal rod 8.
As shown in Figure 3, for the construction method of first shallow rear dark foundation pit supporting construction, comprise the steps:
The first step: according to the requirement of actual conditions, foundation ditch first excavates B1 (shallow foundation hole) region, (deep foundation ditch) region, two layers, rear excavation underground;
Second step: Reinforced Concrete Corbels bearing 5 is set according on the B1 base plate that sequence of construction need formerly be constructed, Reinforced Concrete Corbels bearing 5 is embedded in advance inner through H profile steel skeleton 4 one end sharing external wall 3, during lower two layers of construction ground, two layers, underground reinforced concrete inner support 2 is connected with concrete bracket bearing 5 by the other end of pre-buried H profile steel skeleton 4;
3rd step: concrete bracket bearing 5, pre-buried H profile steel skeleton 4 are poured into a mould together with B1 base plate; Before casting reinforced concrete bracket bearing 5, guarantee that Reinforced Concrete Corbels bearing 5 and pre-buried shaped steel 3 link together with the reinforced concrete inner support 2 of two layers, underground, can implement;
4th step: remove two layers, underground and support while 2, cut Reinforced Concrete Corbels bearing 5; Bearing 5 when cutting reinforced concrete bracket, answering subregion, jumping every cutting, and should adopt and manually slowly cut, and avoids affecting agent structure;
5th: after cutting, according to Structural Design Requirement leveling sole plate 1.
H profile steel skeleton 4 interts in concrete inner support 2 with concrete bracket bearing 5, multiple horizontal hoop 9 should be set along H profile steel length, to retrain eccentric force to concrete adverse effect, strengthen the adhesion stress between H profile steel skeleton 4 and concrete, section steel flange arranged outside high strength cylindrical pin 6 simultaneously in axial force of the supports larger portion position, prevent from producing Relative sliding between type Steel concrete, cause support system unstability; Shaped steel termination arranges the quantity of pin, can calculate the shear stress of section steel flange outer surface, corresponding to the shearing of this shear stress, all be born by pin, the concrete quantity n of shaped steel shearing resistance pin according to elastic method
stemploying following formula calculates:
n
st＝V
st/N
st
In formula: V
stfor the horizontal shear design load that bottom flange pin 6 on shaped steel bears; N
stfor single pin 6 shear resistance capacity; A
stfor bar section area followed closely by pin 6; E
c, f
cbe respectively Reinforced Concrete Corbels bearing 5 modulus of elasticity of concrete and axial compressive strength design load; f
st ufor the ultimate tensile strength minimum value of pin 6 steel.
Claims (8)
1., for a first shallow rear dark foundation pit supporting construction, it is characterized in that: described foundation pit supporting construction comprise for the later stage build the reinforced concrete inner support structure of deep foundation ditch, Reinforced Concrete Corbels bearing, and H profile steel skeleton; One end of described reinforced concrete inner support structure and Reinforced Concrete Corbels bearing all shares external wall by depth foundation ditch and arranges; Described H profile steel skeleton shares external wall through depth foundation ditch, and one end is connected to reinforced concrete inner support inside configuration, and it is inner that the other end is connected to Reinforced Concrete Corbels bearing; The other end of Reinforced Concrete Corbels bearing and shallow-layer sole plate link together to construct simultaneously and form; Steel plate for sealing water is welded with outside the described H profile steel skeleton through shared external wall.
2. as claimed in claim 1 for first shallow rear dark foundation pit supporting construction, it is characterized in that: described reinforced concrete inner support structure comprises many reinforced concrete inner supports, every root reinforced concrete inner support inside is provided with a H profile steel skeleton, H profile steel skeleton comprises the Ф 19 socket cap high strength shearing resistance pin that uniform section 400 × 400 shaped steel and the edge of a wing thereof are welded, H profile steel skeleton one end is embedded in reinforced concrete inner support inside, it is inner that the other end is embedded in Reinforced Concrete Corbels bearing, Ф 19 socket cap high strength shearing resistance pin be arranged on be embedded in the inner and Reinforced Concrete Corbels bearing inside of reinforced concrete inner support section steel flange on, play shearing resistance effect.
3. as claimed in claim 1 for first shallow rear dark foundation pit supporting construction, it is characterized in that: described reinforced concrete inner support is made up of jointly vertical internal rod and horizontal hoop and concrete three.
4., as claimed in claim 1 for first shallow rear dark foundation pit supporting construction, it is characterized in that: described Reinforced Concrete Corbels bearing is made up of with horizontal hoop and concrete three jointly the vertical muscle of top longitudinal stress.
5. realize the construction method for first shallow rear dark foundation pit supporting construction described in claim 1-4 any one, it is characterized in that: comprise the steps:
The first step: according to the requirement of actual conditions, foundation ditch first excavates B1 region, rear excavation underground two layer region;
Second step: Reinforced Concrete Corbels is set according on the B1 base plate that sequence of construction need formerly be constructed, Reinforced Concrete Corbels bearing is embedded in advance inner through the H profile steel skeleton one end sharing external wall, during lower two layers of construction ground, two layers, underground reinforced concrete inner support is connected with concrete bracket bearing by the other end of pre-buried H profile steel skeleton;
3rd step: concrete bracket bearing, pre-buried H profile steel skeleton are poured into a mould together with B1 base plate; Before casting reinforced concrete bracket bearing, guarantee that the reinforced concrete inner support of Reinforced Concrete Corbels bearing and pre-buried shaped steel and two layers, underground links together, can implement;
4th step: while removing the support of two layers, underground, cut Reinforced Concrete Corbels bearing; Bearing when cutting reinforced concrete bracket, answering subregion, jumping every cutting, and should adopt and manually slowly cut, and avoids affecting agent structure;
5th: after cutting, according to Structural Design Requirement leveling sole plate.
6. as claimed in claim 5 for the construction method of first shallow rear dark foundation pit supporting construction, it is characterized in that: Ф 19 high strength cylindrical pin is welded on the edge of a wing being embedded in the H profile steel in Reinforced Concrete Corbels, plays shearing resistance effect.
7. as claimed in claim 5 for the construction method of first shallow rear dark foundation pit supporting construction, it is characterized in that: described H profile steel component interts in concrete inner support and concrete bracket, multiple horizontal hoop should be set along H profile steel length, to retrain eccentric force to concrete adverse effect, strengthen the adhesion stress between reinforcing bar and concrete, section steel flange arranged outside high strength cylindrical pin simultaneously in axial force of the supports larger portion position, prevent from producing Relative sliding between type Steel concrete, cause support system unstability; Shaped steel termination arranges the quantity of pin, can calculate the shear stress of section steel flange outer surface, corresponding to the shearing of this shear stress, all be born by pin, the concrete quantity n of shaped steel shearing resistance pin according to elastic method
stemploying following formula calculates:
n
st＝V
st/N
st
In formula: V
stfor the horizontal shear design load that bottom flange pin on shaped steel bears; N
stfor single pin shear resistance capacity; A
stfor pin nail bar section area; E
c, f
cbe respectively Reinforced Concrete Corbels bearing modulus of elasticity of concrete and axial compressive strength design load; f
st ufor the ultimate tensile strength minimum value of pin steel.
8. as claimed in claim 5 for the construction method of first shallow rear dark foundation pit supporting construction, it is characterized in that: the described H profile steel through party wall welds steel plate for sealing water outside it can solve the requirement of structure outer to waterproof effectively.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975607A (en) * | 2015-07-22 | 2015-10-14 | 中建八局第二建设有限公司 | Offshore area local deep foundation pit stanching pit construction method |
| CN107386298A (en) * | 2017-07-19 | 2017-11-24 | 中铁第四勘察设计院集团有限公司 | A kind of depth hole composite supporting construction and its construction method with water-proof function |
| CN108316314A (en) * | 2018-03-13 | 2018-07-24 | 中铁第四勘察设计院集团有限公司 | A kind of inner supporting structure for solving to cheat biasing problem in depth foundation pit |
| CN114855811A (en) * | 2022-06-01 | 2022-08-05 | 上海市城市建设设计研究总院（集团）有限公司 | Three-row pile-combination supporting structure and corresponding foundation pit construction method |
| CN115506362A (en) * | 2022-09-02 | 2022-12-23 | 中国建筑第二工程局有限公司 | Muddy soil body deep and shallow foundation pit supporting structure and construction method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975607A (en) * | 2015-07-22 | 2015-10-14 | 中建八局第二建设有限公司 | Offshore area local deep foundation pit stanching pit construction method |
| CN107386298A (en) * | 2017-07-19 | 2017-11-24 | 中铁第四勘察设计院集团有限公司 | A kind of depth hole composite supporting construction and its construction method with water-proof function |
| CN108316314A (en) * | 2018-03-13 | 2018-07-24 | 中铁第四勘察设计院集团有限公司 | A kind of inner supporting structure for solving to cheat biasing problem in depth foundation pit |
| CN114855811A (en) * | 2022-06-01 | 2022-08-05 | 上海市城市建设设计研究总院（集团）有限公司 | Three-row pile-combination supporting structure and corresponding foundation pit construction method |
| CN114855811B (en) * | 2022-06-01 | 2023-08-01 | 上海市城市建设设计研究总院（集团）有限公司 | Three-row pile supporting structure and corresponding foundation pit construction method |
| CN115506362A (en) * | 2022-09-02 | 2022-12-23 | 中国建筑第二工程局有限公司 | Muddy soil body deep and shallow foundation pit supporting structure and construction method thereof |
| CN115506362B (en) * | 2022-09-02 | 2023-07-25 | 中国建筑第二工程局有限公司 | Mucky soil deep and shallow foundation pit supporting structure and construction method thereof |
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Application publication date: 20150701 |