CN113417310A - Construction method for foundation of column cap type elevator - Google Patents
Construction method for foundation of column cap type elevator Download PDFInfo
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- CN113417310A CN113417310A CN202110613633.XA CN202110613633A CN113417310A CN 113417310 A CN113417310 A CN 113417310A CN 202110613633 A CN202110613633 A CN 202110613633A CN 113417310 A CN113417310 A CN 113417310A
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 239000002689 soil Substances 0.000 claims abstract description 11
- 238000009412 basement excavation Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000009415 formwork Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000002002 slurry Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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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
- E02D29/05—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 at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
Abstract
The invention discloses a construction method of a column cap type elevator foundation, which comprises the following steps: and (5) cleaning the original soil surface at the bottom of the foundation pit. Raft construction, the reinforcement of raft is carried out on foundation ditch bottom surface, template installation is carried out after the ligature finishes, concrete placement is carried out after template installation finishes, it is closely knit to ensure to vibrate during pouring, in time cover the maintenance after pouring the completion. The post construction, the ligature of post reinforcing bar is carried out at raft board top, carries out the template mounting after the ligature finishes, carries out concrete placement after the template mounting finishes, and it is closely knit to guarantee to vibrate during pouring, in time covers the maintenance after pouring the completion. And backfilling earthwork in the foundation pit until the earthwork is above the column, and compacting the backfilled soil above the column within the range of 500 mm. And excavating the position of the column cap, excavating a column cap groove for placing the column cap at the top of the column, and timely erecting a template after the excavation is finished. And (5) constructing the column cap, and constructing the column cap at the top of the column. Installing a lifter; the construction safety is improved, and the economic benefit is improved.
Description
Technical Field
The invention belongs to the technical field of construction methods, and particularly relates to a construction method of a column cap type elevator foundation.
Background
The arrangement of the construction elevator is to be close to the main building, the construction elevator is inevitably located in the range of the fertilizer tank, and if the foundation of the construction elevator is settled or inclined due to poor backfilling quality of earthwork units which are not controlled by the main package, the safety of the elevator is greatly reduced. In order to solve the problem, graded sandstone is often adopted during backfilling, but the backfilling volume of the graded sandstone is large, and the manufacturing cost is often higher.
Disclosure of Invention
Therefore, the invention provides a construction method of a column cap type elevator foundation, which aims to solve the problem of dangerous construction of an elevator caused by settlement or collapse of an elevator foundation supporting point in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme: a construction method of a column cap type elevator foundation comprises the following steps:
and (5) cleaning the original soil surface at the bottom of the foundation pit.
Raft construction, the reinforcement of raft is carried out on foundation ditch bottom surface, template installation is carried out after the ligature finishes, concrete placement is carried out after template installation finishes, it is closely knit to ensure to vibrate during pouring, in time cover the maintenance after pouring the completion.
The post construction, the ligature of post reinforcing bar is carried out at raft board top, carries out the template mounting after the ligature finishes, carries out concrete placement after the template mounting finishes, and it is closely knit to guarantee to vibrate during pouring, in time covers the maintenance after pouring the completion.
And backfilling earthwork in the foundation pit until the earthwork is above the column, and compacting the backfilled soil above the column within the range of 500 mm.
And excavating the position of the column cap, excavating a column cap groove for placing the column cap at the top of the column, and timely erecting a template after the excavation is finished.
And (5) constructing the column cap, and constructing the column cap at the top of the column.
And (5) installing a lifter.
Furthermore, the position of the column rib joint is staggered by a distance of more than 500mm in the column construction, and the upper part of the column rib joint is provided with a 12d bend.
Furthermore, the column hoop in the column construction adopts double steel pipes.
Furthermore, the side edge of the column is tightly supported by an inclined strut.
Further, the concrete is cast by using C30 concrete.
Furthermore, the strength of the concrete poured during the form removal is not lower than 1.2 MPa.
Furthermore, the earth is uniformly backfilled around the column during backfilling, so that the column is prevented from being affected by horizontal load.
Furthermore, should establish the full-time staff of seeing the mould at the in-process of pouring, the template appears leaking thick liquid, the slope scheduling problem should in time be corrected, pours the in-process and pays attention to the concrete and vibrates, ensures that the concrete shaping is closely knit.
The invention has the following advantages:
1. because the main stress position of the elevator is the standard knot position, a concrete structure column is arranged below the standard knot position to be matched with the bottom raft plate so as to bear the main load of the elevator. The upper part is provided with a column cap which is mainly used for bearing the dead weight of the plate and the corresponding live load. The structure of the elevator is stable and does not settle or incline, and the operation safety of the elevator is ensured.
2. Traditional graded gravel backfilling is poor in structural stability and high in uncertainty, is limited by the quality of backfilling, can be settled in rainy seasons and the like, and cannot guarantee safe and stable operation of the elevator. By adopting the construction method, the quality of the backfill soil does not need to be considered, and the safety of the lifter is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of the construction method of the present invention.
Fig. 2 is a schematic view of the frame structure of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
The present embodiment provides a method for constructing a foundation of a cap-type elevator, as shown in fig. 1, including:
s101, cleaning the original soil surface at the bottom of the foundation pit.
S102, raft construction, namely binding reinforcing steel bars of the raft on the surface of the bottom of the foundation pit, installing a template after binding is finished, pouring concrete after template installation is finished, ensuring that the concrete is compacted during pouring, and timely covering and maintaining after pouring is finished. Should guarantee during raft construction that the reinforcement interval is accurate, upper and lower floor's reinforcement interval guarantees to meet the requirements, and the template is erected and is supposed to guarantee the straightness that hangs down to should guarantee not to leak thick liquid, collapse when pouring. C30 concrete is adopted, so that the vibration is ensured to be compact during pouring, and the concrete is covered and maintained in time after pouring is finished.
S103, column construction, namely binding column reinforcing steel bars at the top of the raft, installing templates after binding, pouring concrete after template installation, ensuring that the concrete is compacted during pouring, and timely covering and maintaining after pouring.
The column reinforcement joint is guaranteed to be staggered by a distance of more than 500mm, the upper portion is provided with 12d bending, and the stirrup interval meets the requirement. The column template should guarantee that the straightness that hangs down accords with standard requirement, and the column hoop should adopt two steel pipes. The interval is 500mm, and the side adopts the bracing top tight, guarantees the stability of template. The post adopts C30 concrete placement, and post concrete placement should establish the full-time staff of seeing the mould to cap bottom elevation position, pours the in-process, and the template appears leaking thick liquid, the slope scheduling problem should in time be corrected, pours the in-process and notices the concrete and vibrates, ensures that the concrete shaping is closely knit. And (3) removing the column template when the concrete strength of the column is not lower than 1.2MPa after pouring is finished, and timely maintaining the column after removal.
And S104, backfilling earthwork in the foundation pit until the earthwork is above the column, and compacting the backfilled soil above the column within the range of 500 mm.
When the earthwork is backfilled, the periphery of the column is backfilled uniformly to ensure that the column is not influenced by horizontal load, the column is backfilled to the top to design the elevation of the bottom of the column cap, and the top is compacted within the range of 500 mm.
And S105, excavating the position of the column cap, excavating a column cap groove for placing the column cap at the top of the column, and timely erecting a template after the excavation is finished. Adopting manual excavation operation at the top beam position, and excavating the column cap position to a designed bottom elevation (reserved template thickness); the size of the column cap is ensured, and the template is erected in time after the excavation is finished.
S106, constructing a column cap, and constructing the column cap at the top of the column, wherein the construction method is to adopt a common construction method, the column cap steel bars pay attention to that the anchoring length needs to meet the on-site requirement, and the arrangement position and the spacing of the split heads are paid attention to when the plate steel bars are bound, so that the spacing of the double-layer steel bars is ensured;
and S107, installing a lifter.
Specifically, the construction quality control process is as follows: the strength grade, functionality (anti-permeability, anti-freezing, etc.), durability (chloride ion, alkali content, etc.), and workability (consistency, pumping, early strength, delayed coagulation, etc.) of the concrete all meet the design requirements and specification standards, and meet the requirements of construction operation.
The concrete is transported to a pouring place, and the consistency (slump and expansion) of the concrete meets the construction and design requirements, and is not layered or isolated. And should have sun-proof and rain-proof properties in summer and heat-insulating and wind-snow-preventing measures in winter.
Before concrete is poured, the inspection and acceptance of hidden projects are required to be completed. Checking the tight and flatness of the joints of the template, removing impurities in the template, and checking the positions of the embedded parts, the box and the holes, the thickness of the protective layer and the reliability of the positioning measures. The steel bar framework is strictly prevented from being poured, vibrated and stepped, and the steel bar framework of the plate type is provided with an iron split heads bracket for paving and lapping the springboard.
Pouring a vertical structure, paving cement mortar (without stones during stirring) with proper thickness and the same components as the concrete at the construction joint according to the measures of the construction technical scheme or paving the concrete at the joint position of the construction joint according to the following steps of 1: 2, the cement mortar is fused with the concrete, and a mortar layer cannot be exposed at the construction joint after the form is removed.
Pouring concrete into the mold, and preventing the concrete from intensively dumping to impact the formwork or the steel reinforcement framework. And uniformly distributing the materials in layers according to a pouring procedure. When the filling height of the column and the wall plate is more than 2m, a string cylinder and a chute are adopted for blanking.
The concrete is vibrated, the dense holes, the reserved holes, the box, the embedded parts, the positions of the steel bars and the thickness of the protective layer are ensured to be accurate, and the surface layer is smooth. And leakage vibration, under vibration or over vibration are strictly prevented.
After concrete pouring, covering, moisturizing and curing measures should be taken within 12 hours in time to strictly prevent dehydration and cracks. The maintenance agent is adopted, so that the water-retaining property is good, the spraying is uniform, and the surface layer is not polluted; maintaining with plastic film, tightly covering, preventing wind from blowing open, and keeping the film moist; adopts watering maintenance, temperature control and temperature measurement measures. In winter, heat preservation and antifreezing measures should be taken. The curing time of the concrete and the strength of the upper mounting template thereof should meet the current specifications.
The concrete of the whole structure is compact and neat, the surface layer is smooth, the edges and corners are neat and straight, the beam column nodes, the intersection angles of the wall boards, the lines and the surfaces are straight and clear, and the arching lines and the surfaces are smooth. No honeycomb, pitted surface, peeling and holes; no leakage, die running, die expansion, slab staggering, root rot and cracks. The construction joint is tightly and smoothly combined, has no inclusion, cold joint and mortar interlayer.
The protective layer is accurate, no exposed ribs and no rust penetration exist, and the reserved holes are neat to the edges of post-cast strips and construction joint holes. The bottom of the embedded part is dense, the surface is smooth, the exposed screw thread of the embedded bolt is qualified, and protective measures are taken.
Traditional graded gravel backfilling is poor in structural stability and high in uncertainty, is limited by the quality of backfilling, can be settled in rainy seasons and the like, and cannot guarantee safe and stable operation of the elevator. By adopting the construction method, the quality of the backfill soil does not need to be considered, and the safety of the lifter is ensured.
The method is economical and specifically comprises the following steps:
backfilling graded sandstone: carrying out heavy planting with backfill amount of about 5 × 8 × 5m =200m, and manufacturing cost of 200 × 230=46000 Yuan
Frame-type elevator basis: the cost is about 15000 yuan after accounting, and the cost is saved by 3.1 ten thousand yuan.
The construction method for the frame foundation of the construction elevator in a certain project has the advantages that the practical application effect proves that the construction method obviously reduces the backfill quality requirement of the backfill part and can ensure the operation safety of the elevator. The construction completion effect is highly recognized by owners, a good social image is established for enterprises, and the reputation of the enterprises is enhanced.
Specific use examples: the method is adopted for the elevator foundation, the effect is good, the construction is safe, the elevator foundation does not settle when experiencing typhoon, rainstorm and the like, and the operation safety of the elevator is ensured.
The frame structure of the construction method of the frame type foundation of the construction elevator comprises the following steps: the raft plate a is horizontally arranged at the bottom of the foundation pit; the column b is vertically arranged at the central point of the raft plate and is fixedly connected with the raft plate a; and the column cap c is fixedly arranged at the top of the column b. Referring to fig. 2, in use, the raft a is disposed at the bottom of the foundation pit, the foundation pit is filled with backfill soil, and the top of the cap is used as a support point for the standard section of the elevator.
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 construction method of a column cap type elevator foundation is characterized by comprising the following steps:
cleaning the original soil surface at the bottom of the foundation pit;
performing raft construction, namely binding reinforcing steel bars of the raft on the surface of the bottom of the foundation pit, installing a template after binding is finished, pouring concrete after the template is installed, ensuring dense vibration during pouring, and timely covering and maintaining after pouring is finished;
performing column construction, namely binding column reinforcing steel bars at the top of the raft, installing templates after binding is finished, pouring concrete after the templates are installed, ensuring that the concrete is compacted during pouring, and timely covering and maintaining after pouring is finished;
backfilling earthwork in the foundation pit to the position above the column, and compacting the backfilled soil above the column within the range of 500 mm;
excavating the position of the column cap, excavating a column cap groove for placing the column cap at the top of the column, and timely erecting a template after the excavation is finished;
constructing a column cap, namely constructing the column cap at the top of the column;
and (5) installing a lifter.
2. The method for constructing a foundation of a cap-type lifter according to claim 1, wherein the positions of the column rib joints in the column construction are staggered by a distance of 500mm or more, and the upper part of the column rib joints is provided with a 12d bend.
3. The method of claim 1, wherein the column hoop is a double steel pipe.
4. The method of claim 1, wherein the sides of the column are braced with diagonal braces.
5. The method of constructing a cap elevator foundation of claim 1, wherein the concrete is cast using C30 concrete.
6. The method of claim 1, wherein the strength of the concrete poured during form removal is not less than 1.2 MPa.
7. The method of claim 1, wherein the earth is backfilled uniformly around the column to ensure that the column is not subjected to horizontal loading.
8. The method for constructing the foundation of the cap-type lifter according to the claim 1, wherein a dedicated worker is required to watch the formwork during the pouring process, the problems of slurry leakage, inclination and the like of the formwork are corrected in time, and the concrete is vibrated during the pouring process to ensure the compact formation of the concrete.
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| CN202110613633.XA CN113417310A (en) | 2021-06-02 | 2021-06-02 | Construction method for foundation of column cap type elevator |
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| CN202110613633.XA CN113417310A (en) | 2021-06-02 | 2021-06-02 | Construction method for foundation of column cap type elevator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075263A (en) * | 2022-05-22 | 2022-09-20 | 北京金港场道工程建设有限公司 | Airport runway section device, construction method and backfill reverse construction method mold device |
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Application publication date: 20210921 |