CN116464060A - Construction method for accelerating high-span region structure at high-low span position of basement bottom plate - Google Patents
Construction method for accelerating high-span region structure at high-low span position of basement bottom plate Download PDFInfo
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- CN116464060A CN116464060A CN202310053842.2A CN202310053842A CN116464060A CN 116464060 A CN116464060 A CN 116464060A CN 202310053842 A CN202310053842 A CN 202310053842A CN 116464060 A CN116464060 A CN 116464060A
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- 238000010276 construction Methods 0.000 title claims abstract description 124
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 62
- 239000010959 steel Substances 0.000 claims abstract description 62
- 238000009434 installation Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000004567 concrete Substances 0.000 claims description 24
- 239000002689 soil Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 20
- 230000008093 supporting effect Effects 0.000 claims description 12
- 238000009415 formwork Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000011378 shotcrete Substances 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
A construction method for accelerating a high-span region structure at a high-low span position of a basement bottom plate comprises the following steps: step 1, designing a retaining wall; step 2, excavating an earthwork slope; step 3, constructing a low-cross-area bottom plate; step 4, construction of the retaining wall; step 5, waterproof construction and section steel support installation; step 6, backfilling earthwork and constructing an outer wall of a low-cross area; step 7, constructing a high-span region bottom plate and constructing a low-span region beam plate; step 8, synchronously constructing high and low cross areas; according to the invention, the prefabricated retaining wall and the corresponding diagonal braces are additionally arranged on the outer side of the outer wall of the low-span region, so that the earthwork slope-releasing region at the junction of the high-span region and the low-span region can be backfilled in advance, the operation condition is provided for the construction of the high-span region and the bottom plate, the construction progress of the high-span region is accelerated, the same-layer structure with the low-span region can be synchronously constructed, various construction problems caused by cross operation are avoided, the retaining wall can be integrated with the low-span region in the follow-up process, and the structural stability is improved.
Description
Technical Field
The invention relates to the technical field of building engineering construction, in particular to a construction method for accelerating a high-span region structure at a high-span and low-span position of a basement bottom plate.
Background
In the basement construction process, the bottom plates in the form of high-low spans exist in partial areas, namely, the elevation of the bottom plates at two adjacent sides is inconsistent, and a certain height difference exists. Meanwhile, the elevation of the foundation top below the bottom plates at two sides is different, and then the earth excavation depths at two sides are different. According to the normal construction flow, a certain working surface is reserved for the construction of the outer wall of the low-span region by adopting an earthwork slope-releasing or pile-arranging enclosing mode on one side of the high-span side at the junction of the high span and the low span, and meanwhile, the problem that earthwork collapse occurs in the construction of the soil body of the high-span region in the low-span region can be avoided.
But adopts an earthwork slope-releasing mode, the earthwork excavation amount is large, and the earthwork backfilling can be carried out on the slope-releasing position after the low-span region reaches the design strength, so that the quality problems of cracks, inclination and the like caused by overlarge soil stress of the structure are prevented, meanwhile, the backfilling earthwork amount is excessive and limited by site roads, and can only be transported through a tower crane, so that a large amount of operation time of the tower crane is occupied, and the construction of other regions is influenced; the pile-arranging and enclosing mode reduces the earth excavation amount, but the pile-arranging cost is higher, the cost is not easy to be saved, and the earlier-stage enclosing and piling operation still occupies a certain construction period, so that the whole construction period cannot be effectively shortened.
After a certain working surface is reserved for the low-span region outer wall construction in an earthwork slope-releasing or pile-arranging enclosing mode, after the low-span region earthwork is excavated, the outer wall structure and the waterproof construction are sequentially carried out after the low-span region bottom plate construction is completed and reaches a certain strength, and then the fertilizer groove in the low-span region can be backfilled, namely, the earthwork backfilling on one side of the high span at the junction of the high span and the low span is leveled, and then the construction operation is carried out on the high-span region bottom plate. According to the conventional construction flow, when the high-span area bottom plate starts to perform construction operation, the low-span area is generally constructed upwards to the second layer and the third layer, when the construction progress at two sides is inconsistent, the construction is also easily affected, the overall construction progress is delayed, the cross operation is caused, and the greater potential safety hazard is generated.
Based on the above problems, there is a need to develop a construction method for accelerating the construction of a high-span region structure at the high-low span position of a basement bottom plate, so that the construction of the high-span region of the basement can be started in advance, and the construction delay of the high-span region due to waiting for the construction of the low-span region structure and earth backfilling is avoided.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a construction method for accelerating the construction of a high-span area structure at the high-low span position of a basement bottom plate, so that the construction of the high-span area structure of the basement can be started in advance, and the construction delay of the high-span area structure caused by waiting for the construction of the low-span area structure and earth backfilling is avoided.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a construction method for accelerating a high-span region structure at a high-low span position of a basement bottom plate comprises the following steps:
step 1, designing a retaining wall: designing the size, reinforcement and the size and arrangement space of the profile steel support of the retaining wall according to the parameters of backfill on the drawing;
step 2, excavating an earthwork slope: digging foundation pit earthwork to the bottom elevation of the high-span region bottom plate cushion layer, determining the starting point of soil slope discharging, then digging the bottom elevation of the low-span region bottom plate cushion layer, and discharging the slope while digging and supporting by concrete shotcrete;
step 3, constructing a low-cross-area base plate: sequentially carrying out cushion layer and waterproof layer construction in the low-crossing region;
and 4, construction of a retaining wall: binding retaining wall steel bars at the pick-up positions of the low-span region bottom plates, and then carrying out formwork supporting and concrete pouring, wherein the retaining wall height is applied to the bottom of the high-span region bottom plates;
step 5, waterproof construction and section steel support installation: paving an outer wall waterproof coiled material on the inner side of the retaining wall; respectively welding two ends of a section steel support on a low-span region bottom plate and an inclined support embedded part of a retaining wall;
step 6, backfilling earthwork and constructing an outer wall of a low-cross-area structure: backfilling soil in the triangular area outside the retaining wall after the profile steel support is installed, binding reinforcing steel bars of the outer wall of the basement in the low-span area, erecting side templates, and pouring concrete;
step 7, constructing a high-span region bottom plate and constructing a low-span region beam plate: simultaneously carrying out construction operation on the high-span region bottom plate cushion layer and the low-span region beam slab formwork, binding high-span region bottom plate steel bars and low-span region beam slab steel bars together, and simultaneously pouring concrete;
step 8, high-low cross-region synchronous construction: and the subsequent superstructure construction of the high-span region and the low-span region is carried out, and the progress of the two sides is consistent.
As a preferable scheme of the invention, the height dimension of the retaining wall in the step 1 is larger than or equal to 200mm, the steel material of the section steel support is 10# or more steel, and the distance between adjacent section steel supports is 2-4 m.
As a preferable scheme of the invention, the construction speed of the retaining wall in the step 4 is faster than that of the low-span area whole-layer structure, the retaining wall can be constructed by adopting a prefabricated part on-site assembly method, and the retaining wall needs to be poured for multiple times when the height of the retaining wall is more than 4 meters.
As a preferable scheme of the invention, the section steel diagonal braces in the step 5 are distributed at equal intervals along the longitudinal direction of the retaining wall.
As a preferable scheme of the invention, in the step 5, the lower connector of the outer wall waterproof roll is connected with the upturned part of the low-span area bottom plate waterproof roll.
As a preferable mode of the invention, the water stop sheet in the step 5 should be positioned in the middle of the outer wall of the low-span area basement for post construction.
As a preferable scheme of the invention, in the step 5, one end of the section steel support close to the retaining wall is provided with a water stop sheet, and the end is welded on the diagonal support embedded part of the retaining wall.
As a preferable scheme of the invention, the included angle formed by the profile steel diagonal bracing and the low-span region bottom plate in the step 5 is larger than or equal to 30 degrees.
In a preferred embodiment of the present invention, the backfill soil in step 6 is low-grade concrete, and the backfill soil provides an operation surface for high-span area floor construction.
As a preferable scheme of the invention, the exposed part of the section steel diagonal brace is cut and removed after the strength of the low-cross-area basement exterior wall concrete in the step 8 reaches 75%.
The beneficial effects of the invention are as follows:
1. according to the invention, the prefabricated retaining wall and the corresponding diagonal braces are additionally arranged on the outer side of the outer wall of the low-span region, so that the earthwork slope-releasing region at the junction of the high-span region and the low-span region can be backfilled in advance, the operation condition is provided for the construction of the high-span region and the bottom plate, the construction progress of the high-span region is accelerated, the same-layer structure with the low-span region can be synchronously constructed, various construction problems caused by cross operation are avoided, the retaining wall can be integrated with the low-span region in the follow-up process, and the structural stability is improved.
2. According to the invention, the earthwork backfilling can be carried out on the slope-releasing position after the low-span region reaches the design strength, so that partial steps of the high-span region and the low-span region can be synchronously constructed without influencing the construction of other regions, and the whole construction period is effectively shortened; meanwhile, the cost of the retaining wall and the inclined strut is low, and the retaining wall and the inclined strut are beneficial to practical application.
3. The waterproof coiled material is arranged on one side of the retaining wall facing the low-span region, and is connected with the waterproof coiled material of the low-span region, so that moisture on the other side of the retaining wall is prevented from entering the low-span region through a gap, and the waterproof construction method is beneficial to the full-scale waterproof of the low-span region and the effective construction; meanwhile, a water stop sheet is arranged behind the waterproof coiled material, so that low-cross-area waterproof is enhanced.
4. The design steps of the retaining wall and the profile steel support are known in advance, the sizes and the installation positions of the retaining wall, the profile steel support and the diagonal bracing embedded parts are beneficial to reasonable arrangement of the whole structure and effective execution of subsequent steps.
5. The exposed part of the section steel diagonal bracing can be cut and removed after the strength of the low-span region basement exterior wall concrete reaches 75%, so that the attractiveness and the use effect of the low-span region are greatly improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a schematic construction diagram of step 2 of the present invention;
FIGS. 4-5 are schematic illustrations of the construction of step 3 of the present invention;
FIG. 6 is a schematic construction diagram of step 4 of the present invention;
FIG. 7 is a schematic illustration of the construction of step 5 of the present invention;
FIG. 8 is a schematic construction diagram of step 6 of the present invention;
FIGS. 9-10 are schematic illustrations of the construction of step 7 of the present invention;
FIG. 11 is a schematic illustration of the construction of step 8 of the present invention;
reference numerals in the drawings: the concrete-filled self-sealing wall comprises a retaining wall 1, a section steel diagonal bracing 2, an outer wall waterproof coiled material 3, a spray anchor support 4, backfill 5, a low-span region bottom plate 6, a low-span region basement outer wall 7, a high-span region bottom plate 8, a low-span region beam plate 9, a diagonal bracing embedded part 21 and a water stop sheet 22.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 10, a construction method for accelerating a high-span region structure at a high-low span position of a basement bottom plate comprises the following steps:
step 1, designing a retaining wall: according to the corresponding parameters of the square quantity, backfill height and the like of the backfill soil 5 on the drawing, designing the size, the reinforcement of the retaining wall 1, the size and the arrangement spacing of the profile steel supports 2;
step 2, excavating an earthwork slope: after the earthwork of the foundation pit is excavated to the bottom elevation of the cushion layer of the high-span region bottom plate 8, determining an earthwork slope discharging starting point, excavating low-span region earthwork from the starting point, discharging the slope surface while excavating, and carrying out shotcrete support 4 until the foundation pit is excavated to the bottom elevation of the cushion layer of the low-span region bottom plate 6;
step 3, constructing a low-cross-area base plate: the construction of a cushion layer and a waterproof layer is sequentially carried out in the low-span region, the reinforcement binding, the concrete pouring and the maintenance are synchronously carried out on the low-span region bottom plate 6 and a bearing platform thereof, and the position of the outer wall 7 of the basement in the low-span region at the position of the cantilever of the low-span region bottom plate 6 is turned up by 300mm during the construction;
and 4, construction of a retaining wall: binding reinforcing steel bars of the retaining wall 1 at the pick-up position of the low-span region bottom plate 6, namely flanging a waterproof coiled material under the low-span region bottom plate 6 to the upper turnover position of the outer wall 7 of the low-span region basement inside the retaining wall 1, binding reinforcing steel bars of the retaining wall 1 above the waterproof coiled material, then carrying out formwork supporting and concrete pouring, and dismantling a side formwork of the retaining wall 1 after the strength of the retaining wall 1 meets the formwork dismantling requirement, wherein if the retaining wall 1 adopts prefabricated components, the height of the retaining wall 1 is applied to the bottom of the high-span region bottom plate 8 without formwork supporting and formwork dismantling;
step 5, waterproof construction and section steel support installation: paving an outer wall waterproof coiled material 3 on the inner side of the retaining wall 1, wherein the lower interface of the outer wall waterproof coiled material 3 is connected with the upturned part of the waterproof coiled material of the low-span area bottom plate 6; two ends of the section steel support 2 are respectively welded on the low-span region bottom plate 6 and the diagonal support embedded part 21 of the retaining wall 1, wherein one end, close to the retaining wall 1, of the section steel support 2 is provided with a water stop sheet 22, and the end is welded on the diagonal support embedded part 21 on the retaining wall 1;
step 6, backfilling earthwork and constructing a low-cross-area outer wall: after the profile steel support 2 is installed, backfilling soil 5 is carried out on the triangular area on the outer side of the retaining wall 1, and meanwhile, binding reinforcing steel bars of the outer wall 7 of the basement in the low-span area, erecting side templates and pouring concrete;
step 7, constructing a high-span region bottom plate and constructing a low-span region beam plate: after backfilling of the backfill 5 of the high-low cross-over area is completed, and the concrete strength of the outer wall 7 of the basement in the low cross-area meets the requirement, the cushion layer of the bottom plate 8 of the high cross-area and the formwork of the beam plate 9 of the low cross-area are simultaneously constructed, then the steel bars of the bottom plate 8 of the high cross-area and the steel bars of the beam plate 9 of the low cross-area are bound together, and concrete is poured simultaneously, at the moment, no vertical construction joint is reserved in the cross-over area;
step 8, high-low cross-region synchronous construction: and the subsequent superstructure construction of the high-span region and the low-span region is carried out, and the progress of the two sides is consistent.
The method sequentially comprises a retaining wall design step, an earthwork slope excavation step, a low-span region bottom plate construction step, a retaining wall construction step, a waterproof construction step, a section steel support installation step, an earthwork backfilling step, a low-span region structure outer wall construction step, a high-span region bottom plate construction step, a low-span region beam plate construction step and a high-low-span region synchronous construction step to finish the construction of the basement with a high-low span form.
The low-cross-region waterproof construction in the step 5 can be synchronously carried out with the support and installation of the section steel; the earth backfilling in the step 6 can be synchronously carried out with the construction of the outer wall of the low-cross-area structure; step 7, the construction of the high-span region bottom plate can be synchronously carried out with the construction of the low-span region beam plate, and only one prefabricated retaining wall and corresponding diagonal bracing are additionally arranged, so that earth backfilling can be carried out on the slope-placing position after the low-span region reaches the design strength, and partial steps of the high-span region and the low-span region can be synchronously carried out, and the whole construction period is effectively shortened; meanwhile, the cost of the retaining wall and the inclined strut is low, the construction of other areas is not influenced, and various construction problems caused by cross operation are avoided.
According to the invention, the prefabricated retaining wall and the corresponding diagonal braces are additionally arranged on the outer side of the outer wall of the low-span region, so that the earthwork slope-releasing region at the junction of the high-span region and the low-span region can be backfilled in advance, the operation conditions are provided for the construction of the high-span region and the bottom plate, the construction progress of the high-span region is accelerated, the same-layer structure with the low-span region can be synchronously constructed, the retaining wall can be integrated with the low-span region in the following process, and the structural stability is improved.
The reinforcement bar binding and the side template erection of the low-span basement outer wall 7 in the step 1 can also start reinforcement bar binding and template erection together with other low-span wall columns, and concrete pouring is carried out before backfilling 5 is completed;
the height dimension of the retaining wall 1 in the step 1 is larger than or equal to 200mm, the design dimension accords with the reality, the retaining wall 1 is guaranteed to have enough strength to block backfill soil 5, low-span areas and high-span areas can be effectively separated, meanwhile, the steel material of the profile steel support 2 is 10# or more steel materials, the supporting capacity of the profile steel support 2 on the retaining wall 1 is further improved by the high-strength material, the retaining wall 1 is prevented from being deformed due to the fact that the backfill soil 5 extrudes the retaining wall 1, the distance between adjacent profile steel supports 2 is 2-4 m, the increase cost of too many profile steel supports 2 is prevented from being distributed at too small intervals, and the condition that the too large-size profile steel supports 2 cannot play an effective supporting role is avoided.
The construction speed of the retaining wall 1 in the step 4 is greatly faster than that of a low-span area whole-layer structure, so that the conventional construction machinery can be adopted to timely backfill earthwork on one side of the retaining wall 1; when the site conditions allow, especially the lifting capacity of the lifting machinery meets the requirements, the retaining wall 1 can also be constructed by adopting a prefabricated part site assembly method, so that the starting time of the earth backfilling operation is further advanced; the retaining wall 1 needs pouring for many times when the height is more than 4 meters, and is used for guaranteeing the strength of the retaining wall.
In the step 5, the section steel diagonal braces 2 are distributed at equal intervals along the longitudinal direction of the retaining wall 1, and the section steel diagonal braces 2 play the same supporting role on each section of the retaining wall 1, so that the retaining wall 1 can effectively support backfill 5.
In the step 5, the lower interface of the outer wall waterproof coiled material 3 is connected with the upturned part of the waterproof coiled material of the low-span region bottom plate 6, so that one side of the retaining wall 1 facing the low-span region is completely sealed, moisture on the other side of the retaining wall 1 is prevented from entering the low-span region through a gap, and the waterproof construction in the whole aspect of the low-span region and the effective construction are facilitated.
In step 5, the water stop sheet 22 should be positioned in the middle of the low-span basement outer wall 7 of the post-construction.
In the step 5, the diagonal bracing embedded part 21 which can be positioned and installed with the section steel support 2 is also embedded on the low-span region bottom plate 6, and the diagonal bracing embedded part 21 is convenient for positioning and connecting the low-span region bottom plate 6 and the section steel diagonal bracing 2.
In the step 5, the included angle formed by the section steel diagonal bracing 2 and the low-span region bottom plate 6 is larger than or equal to 30 degrees and smaller than 70 degrees, so that the section steel diagonal bracing 2 is positioned in the middle position of the low-span region bottom plate 6 and the retaining wall 1, and a good supporting effect is achieved.
In the step 6, the backfill soil 5 is low-grade concrete, the backfill soil 5 can improve the overall stability of the backfill region while accelerating the backfill speed, and the backfill soil 5 provides an operation surface for the construction of the high-span region bottom plate 8.
In step 8, after the concrete strength of the low-span basement outer wall 7 reaches 75%, the backfill soil 5 is backfilled, the retaining wall 1 is also formed, the strength of the low-span basement outer wall 7 is enough to support the retaining wall 1, meanwhile, the combination retaining wall 1 of the low-span basement outer wall 7 is also enough to support the backfill soil 5, at the moment, the supporting effect of the section steel diagonal bracing 2 is weakened, the exposed part of the section steel diagonal bracing 2 can be cut and removed, and the influence of the exposed section steel diagonal bracing 2 on the using effect of the low-span region is avoided, and the aesthetic degree of the low-span region is also influenced.
The retaining wall 1 is positioned between the low-span region and the high-span region, is used for backfilling soil bodies of the high-span and low-span junction region in advance for enclosure, is used as an outer formwork of an outer wall of the low-span region of the basement, and can be prefabricated when construction conditions allow, so that the construction progress is further accelerated; the section steel diagonal bracing 2 is positioned between the retaining wall 1 and the low-span region and is used for supporting the retaining wall 1 and preventing the retaining wall 1 from being deformed due to the fact that backfill on one side of the retaining wall 1 presses the retaining wall 1; the diagonal bracing embedded part 21 is embedded in the retaining wall 1 and the low-span region and is used for connecting the profile steel diagonal bracing 2 with the low-span region bottom plate 6 and the retaining wall 1, and meanwhile, the position of the profile steel diagonal bracing 2 is determined so as to facilitate the rapid installation and positioning of the profile steel diagonal bracing 2 with the low-span region bottom plate 6 and the retaining wall 1; the water stop sheet 22 is positioned at the outer side of the diagonal bracing embedded part 21 to prevent the profile steel support 2 from generating water leakage at the outer wall part of the low-span region of the basement; the outer wall waterproof coiled material 3 is used for waterproof construction of the low-cross-region outer wall and the high-low cross-region junction of the basement; the anchor spraying support 4 is used for protecting the soil of the side slope during the earth excavation at the junction of the high span and the low span so as to prevent the soil of the high span region from collapsing; the backfill 5 is used for backfilling the soil (low-grade concrete) in the area between the high-span side slope and the retaining wall, and provides an operation surface for the construction of the high-span bottom plate.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more herein: the concrete-filled building block comprises the following components of retaining wall 1, section steel diagonal bracing 2, outer wall waterproof coiled materials 3, anchor spraying support 4, backfill 5, low-span region bottom plate 6, low-span region basement outer wall 7, high-span region bottom plate 8, low-span region beam plate 9, diagonal bracing embedded parts 21, water stopping sheets 22 and other terms, wherein the possibility of using other terms is not excluded; these terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (10)
1. The construction method for accelerating the construction of the high-span region structure at the high-low span position of the basement bottom plate is characterized by comprising the following steps of:
step 1, designing a retaining wall: according to parameters of backfill soil (5) on a drawing, designing the size and arrangement space of the retaining wall (1), the reinforcement and the size and arrangement space of the profile steel supports (2);
step 2, excavating an earthwork slope: digging foundation pit earthwork to the bedding bottom elevation of the high-span region bottom plate (8), determining an earthwork slope-discharging starting point, then digging the bedding bottom elevation of the low-span region bottom plate (6), and discharging the slope surface while digging and supporting through a concrete shotcrete support (4);
step 3, constructing a low-cross-area base plate: sequentially carrying out cushion layer and waterproof layer construction in the low-crossing region;
and 4, construction of a retaining wall: binding reinforcing steel bars of the retaining wall (1) at the pick-up position of the low-span region bottom plate (6), and carrying out formwork supporting and concrete pouring, wherein the height of the retaining wall (1) is applied to the bottom of the high-span region bottom plate (8);
step 5, waterproof construction and section steel support installation: paving an outer wall waterproof coiled material (3) on the inner side of the retaining wall (1); two ends of the profile steel support (2) are welded on the low-span area bottom plate (6) and the diagonal bracing embedded part (21) of the retaining wall (1) respectively;
step 6, backfilling earthwork and constructing a low-cross-area outer wall: backfilling soil (5) in the triangular area outside the retaining wall (1) after the profile steel support (2) is installed, binding reinforcing steel bars of the basement outer wall (7) in the low-span area, erecting side templates, and pouring concrete;
step 7, constructing a high-span region bottom plate and constructing a low-span region beam plate: simultaneously carrying out construction operation on the cushion layer of the high-span region bottom plate (8) and the formwork support of the low-span region beam plate (9), binding the reinforcing steel bars of the high-span region bottom plate (8) and the reinforcing steel bars of the low-span region beam plate (9) together, and simultaneously pouring concrete;
step 8, high-low cross-region synchronous construction: and the subsequent superstructure construction of the high-span region and the low-span region is carried out, and the progress of the two sides is consistent.
2. The construction method for accelerating the construction of the high-span region structure at the high-low span position of the basement bottom plate according to claim 1, wherein the height dimension of the retaining wall (1) in the step 1 is greater than or equal to 200mm, the steel material of the section steel support (2) is 10# or more, and the distance between the adjacent section steel supports (2) is 2-4 m.
3. The construction method for accelerating the construction of the high-span region structure at the high-low span position of the basement bottom plate according to claim 1, wherein the construction speed of the retaining wall (1) in the step 4 is faster than that of the whole low-span region structure, the retaining wall (1) can be constructed by adopting a prefabricated part on-site assembly method, and pouring is needed for many times when the height of the retaining wall (1) is greater than 4 meters.
4. The construction method for accelerating the construction of the high-span region structure at the high-low span position of the basement bottom plate according to claim 1, wherein the profile steel diagonal braces (2) in the step 5 are distributed at equal intervals along the longitudinal direction of the retaining wall (1).
5. The construction method for accelerating the construction of the high-span region structure at the high-low span position of the basement bottom plate according to claim 1, wherein in the step 5, the lower interface of the outer wall waterproof roll (3) is connected with the upturned part of the waterproof roll of the low-span region bottom plate (6).
6. The construction method for accelerating the construction of the high-span area structure at the high-low span position of the basement bottom plate according to claim 1, wherein the water stop sheet (22) in the step 5 is positioned in the middle of the low-span area basement outer wall (7) of the post construction.
7. The construction method for accelerating the construction of the high-span region structure at the high-low span position of the basement bottom plate according to claim 1, wherein in the step 5, one end, close to the retaining wall (1), of the profile steel support (2) is provided with a water stop sheet (22), and the end is welded on a diagonal bracing embedded part (21) on the retaining wall (1).
8. The construction method for accelerating the construction of the high-span region structure at the high-low span position of the basement bottom plate according to claim 1, wherein an included angle formed by the profile steel diagonal bracing (2) and the low-span region bottom plate (6) in the step 5 is larger than or equal to 30 degrees.
9. The construction method for accelerating the construction of the high-span area structure at the high-low span position of the basement bottom plate according to claim 1, wherein the backfill soil (5) in the step 6 is low-grade concrete, and the backfill soil (5) provides an operation surface for the construction of the high-span area bottom plate (8).
10. The construction method for accelerating the construction of the high-span area structure at the high-low span position of the basement bottom plate, which is disclosed in claim 1, is characterized in that in the step 8, after the concrete strength of the outer wall (7) of the basement in the low-span area reaches 75%, the exposed part of the profile steel diagonal brace (2) is cut and removed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117513396A (en) * | 2023-11-08 | 2024-02-06 | 中信建筑设计研究总院有限公司 | Foundation-free structure at junction of basements of different layers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117513396A (en) * | 2023-11-08 | 2024-02-06 | 中信建筑设计研究总院有限公司 | Foundation-free structure at junction of basements of different layers |
| CN117513396B (en) * | 2023-11-08 | 2024-06-11 | 中信建筑设计研究总院有限公司 | Foundation-free structure at junction of basements of different layers |
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