CN113605456A - Sinking type post-cast strip structure of ultra-long basement and construction method thereof - Google Patents
Sinking type post-cast strip structure of ultra-long basement and construction method thereof Download PDFInfo
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- CN113605456A CN113605456A CN202110893094.XA CN202110893094A CN113605456A CN 113605456 A CN113605456 A CN 113605456A CN 202110893094 A CN202110893094 A CN 202110893094A CN 113605456 A CN113605456 A CN 113605456A
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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
- E02D29/16—Arrangement or construction of joints in foundation structures
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Abstract
The invention discloses a sinking type post-cast strip structure of an ultra-long basement and a construction method thereof, belonging to the technical field of building construction, and comprising the steps of excavating a foundation trench formed on the ground of the basement; bottom plate pouring structures are arranged on the two side walls in the foundation trench and the top surface of the foundation trench, a post-cast strip pouring structure is arranged on the bottom wall in the foundation trench, and the post-cast strip pouring structure is positioned between the bottom plate pouring structures on the two sides and forms a water ditch with the bottom plate pouring structures on the two sides; the opposite surfaces of the bottom plate pouring structures on the two sides in the ditch are respectively provided with a brick wall, a concrete prefabricated cover plate is placed on the brick wall, and the concrete prefabricated cover plate is flush with the bottom plate pouring structures on the top surfaces of the foundation trenches; the bottom plate pouring structure comprises bottom plate steel bars and cast-in-place concrete, the post-cast strip pouring structure comprises post-cast strip steel bars and cast-in-place concrete, and the bottom plate steel bars and the post-cast strip steel bars are bound and fixed. The construction is simple, and the cost is economic, need not to set up the expansion joint to overlength basement, can avoid the adverse effect and the later maintenance trouble that leak during the use produced.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a sinking type post-cast strip structure of an ultralong basement and a construction method thereof.
Background
Concrete shrinks during setting and hardening, and when its deformation is restrained, temperature stress is generated inside the structure, and cracks may occur in the structural member in severe cases. According to the design specification of a concrete structure, the maximum distance of the seams of the cast-in-place frame structure is 55m indoors or in the soil, and the maximum distance of the seams is 35m in the open air. Meanwhile, the specification also provides that the distance between the expansion joints can be properly increased according to the requirement: 1. measures for reducing concrete shrinkage or temperature change are taken; 2. adopting special pre-stressing or reinforcing steel bar construction measures; 3. the construction method comprises the steps of adopting low-shrinkage concrete materials, adopting construction methods such as skip cabin pouring, post-pouring belts, controlling seams and the like, and strengthening construction and maintenance. The arrangement of the post-pouring belt can properly increase the distance between the expansion joints, but cannot replace the expansion joints.
In the existing basement structure design, if the length is not long (for example, less than 150m), the influence of the concrete expansion stress is generally reduced by adopting measures such as low-shrinkage concrete, arrangement of post-cast strip, addition of anti-crack reinforcing steel bars and the like, and expansion joints are not arranged; if the length of the basement is too long (for example, more than 200m), the expansion joints are generally required to be arranged according to the specification. Because the expansion joint is a permanent structural joint, the integrity of the structure can be weakened by arranging the joint, and the waterproof treatment of the building is particularly difficult; south China has more rainwater, and the basement has the expansion joint after the probability of leaking is very big, can influence the service function, and later maintenance is also more troublesome.
Disclosure of Invention
The invention aims to provide a sinking type post-cast strip structure of an ultra-long basement and a construction method thereof, and aims to solve the problem of water leakage influence on use caused by the arrangement of expansion joints of the ultra-long basement structure.
In order to realize the purpose of the invention, the technical scheme is as follows: a sinking type post-cast strip structure of an ultra-long basement comprises a foundation trench formed on the ground of the basement in an excavation mode; bottom plate pouring structures are arranged on two side walls in the foundation trench and the top surface of the foundation trench, a post-cast strip pouring structure is arranged on the bottom wall in the foundation trench, and the post-cast strip pouring structure is positioned between the bottom plate pouring structures on two sides and forms a water ditch with the bottom plate pouring structures on two sides; in the ditch, brick walls are respectively arranged on the opposite surfaces of the bottom plate pouring structures on the two sides, a concrete prefabricated cover plate for closing and covering the ditch is placed on each brick wall, and the concrete prefabricated cover plate is flush with the bottom plate pouring structures on the top surfaces of the foundation trenches; the bottom plate pouring structure comprises bottom plate steel bars and cast-in-place concrete, the post-cast strip pouring structure comprises post-cast strip steel bars and cast-in-place concrete, and the bottom plate steel bars and the post-cast strip steel bars are bound and fixed.
As a further alternative, a gap is reserved between the concrete precast cover plate and the bottom plate pouring structure on the top surface of the foundation trench, and an elastic sealing material is arranged in the gap.
As a further alternative, the gap is 15-20 cm.
As a further alternative, the post-cast concrete is shrinkage-compensating concrete.
As a further alternative, the bottom surface of the foundation trench has a concrete cushion, and the floor casting structure and the post-cast strip casting structure are located above the concrete cushion.
As a further alternative, a water stop steel plate is respectively fixed between the post-cast strip casting structure and the bottom plate casting structures on the two sides.
The invention also provides a construction method of the sinking type post-cast strip structure of the ultra-long basement, which comprises the following steps:
s1, binding a bottom plate steel bar and a post-cast strip steel bar and fixing the bottom plate steel bar and the post-cast strip steel bar into a foundation trench, and forming bottom plate casting structures on two sides in the foundation trench and the top surface of the foundation trench by adopting concrete casting of the bottom plate steel bar;
s2, after the casting is finished for 2 months, casting post-cast strip steel bars, and forming a post-cast strip casting structure by adopting compensation shrinkage concrete during casting;
and S3, after the concrete with the steel bars in the post-cast strip is cast and reaches a certain strength, trowelling and finding a slope by adopting cement mortar on the casting structure of the post-cast strip, and building mortar bricks on two sides respectively to form a brick wall.
And S4, placing the concrete prefabricated cover plate on the top of the brick wall and enabling the concrete prefabricated cover plate to be flush with the peripheral bottom plate pouring structure, reserving a 15-20mm gap between the concrete prefabricated cover plate and the peripheral bottom plate pouring structure, and caulking the gap by adopting an elastic sealing material.
As a further alternative, in step S1, water-stop steel plates are respectively fixed to both sides in the foundation trench, one end of each water-stop steel plate is fixed to the floor reinforcing steel bar, and the other end of each water-stop steel plate is fixed to the post-cast steel reinforcing steel bar.
The invention has the beneficial effects that: adopt formula of sinking post-cast strip, the construction is simple, and cost economy need not to set up the expansion joint to overlength basement, and the adverse effect and the later maintenance that can avoid the production of leaking during the use are troublesome, can avoid the fracture at other positions of basement, and guide structure probably ftractures in formula of sinking post-cast strip department and does not influence the normal use at other positions, has very high practical value.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it should be understood that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a cross-sectional view of a sunken post-cast strip structure of an ultra-long basement according to an embodiment of the invention;
reference numerals: 1-foundation trench, 2-bottom plate steel bar, 3-cast-in-advance concrete, 4-post-cast steel bar, 5-post-cast concrete, 6-ditch, 7-brick wall, 8-concrete prefabricated cover plate, 9-gap, 10-concrete cushion layer and 11-water stop steel plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention. It is to be understood that the drawings are provided solely for the purposes of reference and illustration and are not intended as a definition of the limits of the invention. The connection relationships shown in the drawings are for clarity of description only and do not limit the manner of connection.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention is further described with reference to the following figures and specific embodiments.
Fig. 1 shows a sinking type post-cast strip structure of an ultra-long basement, which comprises a foundation trench 1 formed on the ground of the basement; both side walls in the foundation trench 1 and the top surface of the foundation trench 1 are provided with bottom plate pouring structures, the bottom wall in the foundation trench 1 is provided with post-cast strip pouring structures, and the post-cast strip pouring structures are positioned between the bottom plate pouring structures on both sides and form a water ditch 6 with the bottom plate pouring structures on both sides; in the ditch 6, brick walls 7 are respectively arranged on the opposite surfaces of the bottom plate pouring structures on the two sides, a concrete prefabricated cover plate 8 for sealing the ditch 6 is placed on the brick walls 7, and the concrete prefabricated cover plate 8 is flush with the bottom plate pouring structure on the top surface of the foundation trench 1; the bottom plate pouring structure comprises bottom plate steel bars 2 and cast-in-place concrete 3, the post-cast strip pouring structure comprises post-cast strip steel bars 4 and post-cast concrete 5, and the bottom plate steel bars 2 and the post-cast strip steel bars 4 are bound and fixed.
The structure is usually in the shape flexure, rigidity sudden change, position such as hole reentrant angle is easy to fracture under difference in temperature and contraction action, and this formula of sinking post-cast strip is not at same elevation with the bottom plate, post-cast strip casting structure and bottom plate casting structure promptly, so stagger and produce the reentrant angle, so can guide concrete crack here and produce, the degree of depth of the ditch 6 of formation can set up to 1m, also can set up corresponding ditch deep according to the circumstances, it is deep to have this ditch because of formula of sinking post-cast strip, if there is the available water pump of seepage to take away after the fracture, from not influencing other regional normal use.
The thickness of the plate in the figure is the thickness of the bottom plate pouring structure. A gap 9 is reserved between the concrete prefabricated cover plate 8 and a bottom plate pouring structure on the top surface of the foundation trench 1, and an elastic sealing material is arranged in the gap 9 for caulking and waterproof sealing. The gap 9 may be 15-20 cm. The post-cast concrete 5 is shrinkage-compensating concrete, the strength grade of which is improved by one grade, and the vibration and the maintenance are enhanced.
The bottom surface of foundation trench 1 has concrete cushion 10, and bottom plate casting structure and post-cast strip casting structure are located concrete cushion 10 top. And water stop steel plates 11 are respectively fixed between the post-cast strip pouring structure and the bottom plate pouring structures on the two sides.
The post-cast strip steel bars 4 and the bottom plate steel bars 2 are bound simultaneously, but the post-cast strip concrete is not poured simultaneously with the bottom plate concrete, namely the post-cast concrete 5 is not poured simultaneously with the pre-cast concrete 3, and the post-cast concrete is independently poured after the whole bottom plate concrete is poured for 2 months, and the main reason is that the post-cast strip concrete is connected into a whole after all the block concrete releases deformation caused by temperature stress.
The embodiment also provides a construction method of the sinking type post-cast strip structure of the ultra-long basement, which comprises the following steps:
s1, binding a bottom plate steel bar 2 and a post-cast strip steel bar 4 and fixing the bottom plate steel bar and the post-cast strip steel bar into a foundation trench 1, adopting concrete to cast the bottom plate steel bar 2, and forming bottom plate casting structures on two sides in the foundation trench 1 and the top surface of the foundation trench 1, namely casting for the first time;
s2, after the casting is finished for 2 months, casting the post-cast strip steel bar 4, and forming a post-cast strip casting structure by adopting compensation shrinkage concrete during casting, namely secondary casting;
and S3, after the concrete pouring of the post-pouring strip steel bars 4 is finished and reaches a certain strength, trowelling and finding a slope by adopting cement mortar on the post-pouring strip pouring structure, and building mortar bricks on two sides respectively to form a brick wall 7.
S4, placing the concrete prefabricated cover plate 8 on the top of the brick wall 7 and enabling the concrete prefabricated cover plate to be flush with the peripheral bottom plate pouring structure, reserving a 15-20mm gap 9 between the concrete prefabricated cover plate 8 and the peripheral bottom plate pouring structure, and performing caulking treatment on the gap 9 by adopting an elastic sealing material.
In step S1, the water-stop steel plates 11 are fixed to both sides of the foundation trench 1, one end of each water-stop steel plate 11 is fixed to the floor reinforcing steel bar 2, the other end of each water-stop steel plate 11 is fixed to the post-cast steel bar 4, and the water-stop steel plates 11 are installed before casting.
To super long basement, this back casting zone structure's mutual interval can set up about 150m, need not to set up the expansion joint to the super long basement within 500m, and the adverse effect and the later maintenance that can avoid during the use to leak the production are troublesome.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (8)
1. A sinking type post-cast strip structure of an ultra-long basement comprises a foundation trench formed on the ground of the basement in an excavation mode; the foundation ditch is characterized in that two side walls in the foundation ditch and the top surface of the foundation ditch are respectively provided with a bottom plate pouring structure, a post-cast strip pouring structure is arranged on the bottom wall in the foundation ditch, and the post-cast strip pouring structure is positioned between the bottom plate pouring structures on the two sides and forms a water ditch with the bottom plate pouring structures on the two sides; in the ditch, brick walls are respectively arranged on the opposite surfaces of the bottom plate pouring structures on the two sides, a concrete prefabricated cover plate for closing and covering the ditch is placed on each brick wall, and the concrete prefabricated cover plate is flush with the bottom plate pouring structures on the top surfaces of the foundation trenches; the bottom plate pouring structure comprises bottom plate steel bars and cast-in-place concrete, the post-cast strip pouring structure comprises post-cast strip steel bars and cast-in-place concrete, and the bottom plate steel bars and the post-cast strip steel bars are bound and fixed.
2. The structure of a sunken late poured band of an ultra-long basement according to claim 1, wherein a gap is left between the precast concrete cover plate and the pouring structure of the bottom plate on the top surface of the foundation trench, and an elastic sealing material is arranged in the gap.
3. The structure of the sunken late poured band of the ultralong basement according to claim 2, wherein the gap is 15-20 cm.
4. The structure of a sunken post-cast strip in an ultralong basement according to claim 1, wherein the post-cast concrete is shrinkage-compensating concrete.
5. The structure of a sunken late poured band of an ultralong basement according to claim 1, wherein the bottom surface of the foundation trench has a concrete cushion, and the bottom slab casting structure and the late poured band casting structure are located above the concrete cushion.
6. The structure of a sunken rear pouring belt of an ultra-long basement according to claim 1, wherein a water stop steel plate is fixed between the pouring structure of the rear pouring belt and the pouring structures of the bottom plates on two sides of the pouring structure of the rear pouring belt.
7. A construction method of a sinking type post-cast strip structure of an ultra-long basement is characterized by comprising the following steps:
s1, binding a bottom plate steel bar and a post-cast strip steel bar and fixing the bottom plate steel bar and the post-cast strip steel bar into a foundation trench, and forming bottom plate casting structures on two sides in the foundation trench and the top surface of the foundation trench by adopting concrete casting of the bottom plate steel bar;
s2, after the casting is finished for 2 months, casting post-cast strip steel bars, and forming a post-cast strip casting structure by adopting compensation shrinkage concrete during casting;
and S3, after the concrete with the steel bars in the post-cast strip is cast and reaches a certain strength, trowelling and finding a slope by adopting cement mortar on the casting structure of the post-cast strip, and building mortar bricks on two sides respectively to form a brick wall.
And S4, placing the concrete prefabricated cover plate on the top of the brick wall and enabling the concrete prefabricated cover plate to be flush with the peripheral bottom plate pouring structure, reserving a 15-20mm gap between the concrete prefabricated cover plate and the peripheral bottom plate pouring structure, and caulking the gap by adopting an elastic sealing material.
8. The construction method of a sunken post-cast strip structure of an ultra-long basement according to claim 7, wherein in step S1, water-stop steel plates are respectively fixed to two sides in the foundation trench, one end of each water-stop steel plate is fixed to the bottom plate reinforcing steel bar, and the other end of each water-stop steel plate is fixed to the post-cast steel bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110893094.XA CN113605456A (en) | 2021-08-04 | 2021-08-04 | Sinking type post-cast strip structure of ultra-long basement and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110893094.XA CN113605456A (en) | 2021-08-04 | 2021-08-04 | Sinking type post-cast strip structure of ultra-long basement and construction method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113605456A true CN113605456A (en) | 2021-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110893094.XA Withdrawn CN113605456A (en) | 2021-08-04 | 2021-08-04 | Sinking type post-cast strip structure of ultra-long basement and construction method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN113605456A (en) |
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2021
- 2021-08-04 CN CN202110893094.XA patent/CN113605456A/en not_active Withdrawn
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Application publication date: 20211105 |
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