CN110130355A - Base plate of foundation pit post-cast strip force transferring structure and its construction method - Google Patents

Base plate of foundation pit post-cast strip force transferring structure and its construction method Download PDF

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Publication number
CN110130355A
CN110130355A CN201810128229.1A CN201810128229A CN110130355A CN 110130355 A CN110130355 A CN 110130355A CN 201810128229 A CN201810128229 A CN 201810128229A CN 110130355 A CN110130355 A CN 110130355A
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CN
China
Prior art keywords
post
cast strip
bottom plate
foundation pit
force transferring
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Granted
Application number
CN201810128229.1A
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Chinese (zh)
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CN110130355B (en
Inventor
施群凯
陶荣江
张�雄
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China MCC20 Group Corp Ltd
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China MCC20 Group Corp Ltd
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Priority to CN201810128229.1A priority Critical patent/CN110130355B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The present invention provides a kind of base plate of foundation pit post-cast strip force transferring structure and its construction methods, wherein force transferring structure includes: multiple first steel members along the arrangement of post-cast strip extending direction, is located between the bottom plate of post-cast strip two sides;Along multiple bracket power transmission units of post-cast strip extending direction arrangement comprising: two brackets and a supporting element, two brackets are individually fixed in the upper surface of the bottom plate of post-cast strip two sides, and the supporting element is horizontally supported between two brackets.Base plate of foundation pit post-cast strip provided by the invention force transferring structure and its construction method can effectively solve the problems, such as that small partitioned underplate intensity deficiency in base pit engineering, post-cast strip can not effective forces;Guarantee that deep pit monitor, the bottom plate of casting are not affected destruction;The present invention can reduce the piecemeal of bottom plate, not influence the construction of superstructure utmostly under the premise of guaranteeing deep pit monitor.

Description

Base plate of foundation pit post-cast strip force transferring structure and its construction method
Technical field
The present invention relates to technical field of building construction, specifically, for a kind of base plate of foundation pit post-cast strip force transferring structure and its apply Work method.
Background technique
The underground structure excavation construction of soft clay area generally requires to take and takes supporting measure to foundation pit side, to guarantee The soil body not deformation slip into foundation pit other than foundation pit.When basement buried depth is larger or foundation pit periphery situation complexity is to soil deformation When sensitive, the support pattern of all bored concrete pile campsheds or diaphragm wall is cheated through adding frequently with inner support.According to branch when excavation construction Protection structure design requirement has been constructed supporting construction, then, when basement structure main body is up constructed since sole plate, benefit Foundation pit opposite side power transmission is carried out with the main structure constructed, gradually removes the inner support of supporting construction, this process is known as support replacement.
Currently, support replacement method are as follows: then building enclosure of first constructing sets up horizontally-supported, a part of bottom plate of first constructing, complete Afterwards, on bottom plate setting support bracket, then set up bearing diagonal, after the completion, cut the earth, construct rest part bottom plate, make bottom plate it Between intact combination make its horizontally-supported building enclosure after bottom plate reaches some strength, remove horizontal support, superstructure of constructing.
However in the case where condition is special, for example the oral area in civil air defense constructions and installations, specification bottom plate do not allow to stay to set construction joint, Alternatively, the range in view of underground structure is larger, for the adverse effect for reducing concrete shrinkage effect, set in underground structure plane Several Construction Later Casting Zones up and down are set, the concrete of post-cast strip carries out teeming in the later period.
Basement is divided into multiple isolated areas by the setting of post-cast strip, and main structure power transmission needed for support replacement can be poured by after Band is separated.External force suffered by building enclosure effectively cannot be transmitted and be resisted, bottom plate and building enclosure will be produced after removing support Raw destroying infection, may cause the accidents such as foundation pit collapse.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of base plate of foundation pit post-cast strip force transferring structure and its construction methods, have External force suffered by effect transmitting and resistance building enclosure avoids generating destroying infection to bottom plate and building enclosure after removing support.
In order to solve the above technical problems, the present invention provides a kind of base plate of foundation pit post-cast strip force transferring structures, comprising:
Along multiple first steel members of post-cast strip extending direction arrangement, it is located between the bottom plate of post-cast strip two sides;
Along multiple bracket power transmission units of post-cast strip extending direction arrangement comprising: two brackets and a supporting element, two institutes State the upper surface that bracket is individually fixed in the bottom plate of post-cast strip two sides, the supporting element be horizontally supported in two brackets it Between.
Further, the contact surface of two brackets and the supporting element is arranged in parallel.
Further, multiple second steel members are also distributed with along post-cast strip extending direction, second steel member both ends are buried In the concrete of the bottom plate of post-cast strip two sides.
Further, at the position of post-cast strip, at least one is welded in the main reinforcement of the bottom plate of post-cast strip two sides and is added Strong reinforcing bar, the stiffener are arranged in the same direction with main ribs.
Further, main ribs two sides are respectively and fixedly provided with a stiffener, also, the stiffener and main ribs Diameter is identical, and the length is 1m or more.
The invention also discloses a kind of construction methods of base plate of foundation pit post-cast strip force transferring structure, include the following steps:
A: multiple first brackets are arranged in the upper surface of first bottom plate in the first bottom plate of underground structure of constructing, multiple described First bracket is distributed along post-cast strip extending direction;
B: bearing diagonal part is set up between first bracket and retaining design;
C: the second bottom plate of construction, and multiple second brackets, second bracket and institute are set in the upper surface of second bottom plate State the first bracket one-to-one correspondence;
D: along post-cast strip extending direction, placing multiple first steel members between first bottom plate and the second bottom plate, and described One steel member both ends respectively with first bottom plate and the second contacts baseplate;
E: the bearing diagonal part is removed;
F: setting up supporting element between first bracket and the second bracket, and the supporting element is horizontally disposed.
Further, in step C, the contact surface of two brackets and the supporting element is arranged in parallel.
It further, in step A, further include that extending direction buries multiple second steel members, second steel along post-cast strip The length direction of component and the width direction of post-cast strip are identical, and one end of second steel member is embedded in first bottom plate In concrete;It in step C, further include being embedded in the other end of second steel member in the concrete of second bottom plate.
It further, in step A, further include at the position of post-cast strip, being welded and fixed in the main reinforcement in first bottom plate There is at least one stiffener, the stiffener is arranged in the same direction with main ribs.
Further, main ribs two sides are respectively and fixedly provided with a stiffener, also, the stiffener and main ribs Diameter is identical, and the length is 1m or more.
Base plate of foundation pit post-cast strip provided by the invention force transferring structure and its construction method can be solved effectively in base pit engineering Small partitioned underplate intensity is insufficient, post-cast strip can not effective force the problem of;Guarantee that deep pit monitor, the bottom plate of casting are not affected brokenly It is bad;The present invention can reduce the piecemeal of bottom plate, not influence applying for superstructure utmostly under the premise of guaranteeing deep pit monitor Work.
Detailed description of the invention
Fig. 1 is the schematic diagram of base plate of foundation pit post-cast strip force transferring structure embodiment one of the present invention;
Fig. 2 is the A-A cross-sectional view of Fig. 1;
Fig. 3 is the schematic diagram of base plate of foundation pit post-cast strip force transferring structure embodiment two of the present invention;
Fig. 4 is the schematic diagram of base plate of foundation pit post-cast strip force transferring structure embodiment three of the present invention;
Fig. 5 is the structural representation in base plate of foundation pit post-cast strip force transferring structure construction method of the present invention after the completion of first construction of bottom plates Figure.
In figure, 1. bored concrete piles, 2. first steel members, 3. bracket power transmission units, 301. supporting elements, 302. first Ns Leg, 303. second brackets, 4. first bottom plates, 5. second bottom plates, 6. post-cast strips, 7. second steel members, 8. main reinforcements, 9. Stiffener, 10. is horizontally-supported, 11. bearing diagonal parts.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment one:
A kind of base plate of foundation pit post-cast strip force transferring structure, as depicted in figs. 1 and 2, comprising:
Along multiple first steel members 2 of post-cast strip extending direction arrangement, it is located between the bottom plate of 6 two sides of post-cast strip, sandwiched Between the first bottom plate 4 and the second bottom plate 5,2 both ends of the first steel member are complete with the end face of the first bottom plate 4 and the second bottom plate 5 respectively Face paste is closed, to guarantee that power transmission is uniform;First steel member, 2 height should be less than the height of post-cast strip 6, is subject to and concedes reserved steel bar; First steel member 2 can be I-steel, H profile steel or is welded with steel plate assembly;The spacing of first steel member 2 setting is according to enclosing Type, cutting depth, partitioned underplate equidimension of protection structure etc. are determined by Force Calculation.
Along multiple bracket power transmission units 3 of 6 extending direction of post-cast strip arrangement comprising: it is fixed on the upper table of the first bottom plate 4 First bracket 302 in face is fixed on the second bracket 303 of the upper surface of the second bottom plate 5, is horizontally supported in the first bracket 302 And the second supporting element 301 between bracket 303.
The construction method of above-mentioned post-cast strip force transferring structure includes the following steps: with reference to Fig. 5
A: constructing vertical support unit on foundation pit periphery, excavation pit after construction, while successively construction foundation pit from top to bottom Horizontally-supported the 10 of supporting;
B: after excavation of foundation pit to required absolute altitude, the first bottom plate 4 of underground structure of constructing, in the upper surface of the first bottom plate 4, setting is more A first bracket 302, multiple first brackets 302 are distributed along 6 extending direction of post-cast strip;
C: bearing diagonal part 11, first N of 11 end thereof contacts of bearing diagonal part are set up between first bracket 302 and retaining design Leg 302, the other end can contact the crown beam (not shown) on bored concrete pile 1;
D: the second bottom plate 5 of construction, and multiple second brackets 303, second bracket are set in the upper surface of second bottom plate 5 303 correspond with first bracket 302, and concrete strength is than concrete strength in the second bottom plate 5 in the second bracket 303 A grade is improved, early strength agent is added;
E: along 6 extending direction of post-cast strip, multiple first steel members 2, institute are placed between first bottom plate 4 and the second bottom plate 5 2 both ends of the first steel member are stated to contact with first bottom plate 4 and the second bottom plate 5 respectively;
F: the have ready conditions structure of construction of the load transfering strip etc. of building enclosure side is poured together with bottom plate, reaches strong early convenient for concrete Degree, plays stable building enclosure purpose, after 2 stress of the first steel member, removes the bearing diagonal part 11;
G: setting up supporting element 301 between first bracket 302 and the second bracket 303, and the supporting element 301 is horizontally disposed;
H: after 3 stress of bracket power transmission unit, from lower to upper, horizontally-supported 10 are successively removed, and the first bottom plate 4 and second of constructing The superstructure of bottom plate 5 increases the frequency of foundation pit deformation monitoring when removing horizontally-supported 10, and at least daily one surveys, and discovery becomes Stop tearing support operation open immediately when shape reaches alarming value, carries out the preparation to return back to top;
J: the first steel member 2 is taken out in segmentation, removes position and puts into personnel's construction reinforced bar template concrete immediately, reduces structure without branch The time of support after the completion of post-cast strip 6 pours, after intensity reaches, removes bracket power transmission unit 3.
First bracket 302 before the second bottom plate 5 of constructing for the bearing diagonal in foundation pit, after removal bearing diagonal, again by it The secondary horizontal force transferring structure for using bottom plate enhances the stability of the horizontal force transferring structure of bottom plate, meanwhile, also conveniently tear open Except the first steel member 2.
First bracket 302 is first used for bearing diagonal, so its plane being used to support is horizontal by an angle, for convenient for after Face frame sets supporting element 301, it is ensured that 301 stress equalization of supporting element, the plane and the first bracket 302 that the second bracket 303 is used to support The plane being used to support is arranged in parallel.
Embodiment two:
Embodiment two is the further improvement of embodiment one, to further enhance the stability of the horizontal force transferring structure of bottom plate.? On the basis of embodiment one, as shown in figure 3, multiple second steel members 7 are also distributed with along 6 extending direction of post-cast strip, described second 7 both ends of steel member are embedded in the concrete of the bottom plate of 6 two sides of post-cast strip.Second steel member 7 can for I-steel, H profile steel or It is welded with steel plate assembly.
Embodiment three:
Embodiment three is the further improvement of embodiment one, to further enhance the stability of the horizontal force transferring structure of bottom plate.? On the basis of embodiment one, as shown in figure 4, being welded and fixed in the main reinforcement 8 of the bottom plate of 6 two sides of post-cast strip at 6 position of post-cast strip There is at least one stiffener 9, the stiffener and main ribs 8 are arranged in the same direction.
Further, 8 two sides of main ribs are respectively and fixedly provided with a stiffener 9, also, the stiffener 9 with it is described 8 diameter of main reinforcement is identical, and the length is 1m or more, it is preferable that selects the stiffener 9 of 2m long.
In one optional embodiment of the present embodiment, along post-cast strip, multiple second steel members 7 are also distributed in 6 extending direction, In the concrete for the bottom plate that second steel member, 7 both ends are embedded in 6 two sides of post-cast strip.Second steel member 7 can for I-steel, H profile steel is welded with steel plate assembly.
The scope of protection of the present invention is not limited to this.Those skilled in the art are made equivalent on the basis of the present invention Substitution or transformation, it is within the scope of the present invention.Protection scope of the present invention is subject to claims.

Claims (10)

1. a kind of base plate of foundation pit post-cast strip force transferring structure characterized by comprising
Along multiple first steel members of post-cast strip extending direction arrangement, it is located between the bottom plate of post-cast strip two sides;
Along multiple bracket power transmission units of post-cast strip extending direction arrangement comprising: two brackets and a supporting element, two institutes State the upper surface that bracket is individually fixed in the bottom plate of post-cast strip two sides, the supporting element be horizontally supported in two brackets it Between.
2. base plate of foundation pit post-cast strip as described in claim 1 force transferring structure, which is characterized in that two brackets and the branch The contact surface of support member is arranged in parallel.
3. base plate of foundation pit post-cast strip as described in claim 1 force transferring structure, which is characterized in that also divide along post-cast strip extending direction Multiple second steel members are furnished with, in the concrete for the bottom plate that second steel member both ends are embedded in post-cast strip two sides.
4. base plate of foundation pit post-cast strip as described in claim 1 force transferring structure, which is characterized in that at the position of post-cast strip, after pour At least one stiffener is welded in the main reinforcement of bottom plate with two sides, the stiffener is set in the same direction with main ribs It sets.
5. base plate of foundation pit post-cast strip as claimed in claim 4 force transferring structure, which is characterized in that main ribs two sides are respectively and fixedly provided with One stiffener, also, the stiffener is identical as main ribs diameter, and the length is 1m or more.
6. a kind of construction method of base plate of foundation pit post-cast strip force transferring structure, which comprises the steps of:
A: multiple first brackets are arranged in the upper surface of first bottom plate in the first bottom plate of underground structure of constructing, multiple described First bracket is distributed along post-cast strip extending direction;
B: bearing diagonal part is set up between first bracket and retaining design;
C: the second bottom plate of construction, and multiple second brackets, second bracket and institute are set in the upper surface of second bottom plate State the first bracket one-to-one correspondence;
D: along post-cast strip extending direction, placing multiple first steel members between first bottom plate and the second bottom plate, and described One steel member both ends respectively with first bottom plate and the second contacts baseplate;
E: the bearing diagonal part is removed;
F: setting up supporting element between first bracket and the second bracket, and the supporting element is horizontally disposed.
7. the construction method of base plate of foundation pit post-cast strip as claimed in claim 6 force transferring structure, which is characterized in that in step C, two The contact surface of a bracket and the supporting element is arranged in parallel.
8. the construction method of base plate of foundation pit post-cast strip as claimed in claim 6 force transferring structure, which is characterized in that in step A, also Including along post-cast strip, extending direction buries multiple second steel members, the length direction of second steel member and the width of post-cast strip Degree direction is identical, and one end of second steel member is embedded in the concrete of first bottom plate;In step C, further include, it will The other end of second steel member is embedded in the concrete of second bottom plate.
9. the construction method of base plate of foundation pit post-cast strip as claimed in claim 6 force transferring structure, which is characterized in that in step A, also Including being welded at least one stiffener, the reinforcement in the main reinforcement in first bottom plate at the position of post-cast strip Reinforcing bar is arranged in the same direction with main ribs.
10. the construction method of base plate of foundation pit post-cast strip as claimed in claim 9 force transferring structure, which is characterized in that main ribs Two sides are respectively and fixedly provided with a stiffener, also, the stiffener is identical as main ribs diameter, and the length is 1m or more.
CN201810128229.1A 2018-02-08 2018-02-08 Foundation bottom plate post-cast strip force transmission structure and construction method thereof Active CN110130355B (en)

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Application Number Priority Date Filing Date Title
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Cited By (5)

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CN110939158A (en) * 2020-01-07 2020-03-31 中国建筑第四工程局有限公司 Force transmission device for settling post-cast strip part
CN111305221A (en) * 2019-12-09 2020-06-19 中建四局土木工程有限公司 Method for replacing inner support of foundation pit
CN111608207A (en) * 2020-05-15 2020-09-01 中建三局第三建设工程有限责任公司 Turnover post-cast strip support-changing force transmission device and construction method thereof
CN113463689A (en) * 2021-08-05 2021-10-01 广东中都建筑集团有限公司 Basement bottom plate structure
CN114704309A (en) * 2022-03-07 2022-07-05 中铁第一勘察设计院集团有限公司 Temporary supporting structure for solving conflict between medium plate shield hole boundary beam and shield in subway station

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CN111608207A (en) * 2020-05-15 2020-09-01 中建三局第三建设工程有限责任公司 Turnover post-cast strip support-changing force transmission device and construction method thereof
WO2021228189A1 (en) * 2020-05-15 2021-11-18 中建三局第三建设工程有限责任公司 Reusable post-cast strip support replacement force transfer device and construction method therefor
CN113463689A (en) * 2021-08-05 2021-10-01 广东中都建筑集团有限公司 Basement bottom plate structure
CN114704309A (en) * 2022-03-07 2022-07-05 中铁第一勘察设计院集团有限公司 Temporary supporting structure for solving conflict between medium plate shield hole boundary beam and shield in subway station

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