CN114045860A - Method for preventing concrete under embedded part of tower crane foundation from hollowing - Google Patents
Method for preventing concrete under embedded part of tower crane foundation from hollowing Download PDFInfo
- Publication number
- CN114045860A CN114045860A CN202111375563.5A CN202111375563A CN114045860A CN 114045860 A CN114045860 A CN 114045860A CN 202111375563 A CN202111375563 A CN 202111375563A CN 114045860 A CN114045860 A CN 114045860A
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- China
- Prior art keywords
- embedded part
- reinforcing
- tower crane
- foundation
- embedded
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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
-
- 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
- E02D27/44—Foundations for machines, engines or ordnance
Abstract
The invention relates to a method for avoiding concrete hollowing below an embedded part of a tower crane foundation, which comprises the following steps: construction preparation; step two: blanking: cutting a steel plate into squares by using an oxyacetylene device, wherein the size of the steel plate refers to the size of a bottom plate of an embedded part of a tower crane foundation, and a hole is formed in the center of the steel plate according to the size of an adjusting bolt and a nut; step three: processing a porous plate; step four: welding; step five: sequentially installing a reinforcing supporting leg and an embedded part according to a foundation positioning line, erecting a level gauge, and leveling and aligning the embedded part through an adjusting bolt; step six: the requirement on the integrity of the component after positioning is met; step seven: retesting; step eight: binding upper-layer ribs and template supports of a tower crane foundation, and concealing and checking; step nine: pouring concrete, and reinforcing vibration at the position of the embedded support leg; step ten: and (5) maintaining and checking and accepting the foundation. The method is easy to construct, convenient for adjusting the levelness of the embedded part and capable of avoiding concrete pouring hollowing.
Description
Technical Field
The invention relates to the field of building construction, in particular to a method for avoiding hollowing of concrete below an embedded part of a tower crane foundation.
Background
The tower crane is a special device widely used in the construction industry, and belongs to a major hazard source. In recent years, the occurrence of safety accidents of tower cranes is common. Part of the accident causes are caused by improper setting of the foundation. At present, the foundation of the tower crane is generally divided into a fixed type, a weight-bearing type and a walking type, and the walking type is less used in recent years because the use height of the tower crane is limited. The fixed foundation comprises a supporting leg fixed type, a bolt fixed type, an underframe fixed type and a pre-buried foundation section. Wherein the landing leg is fixed comparatively common with pre-buried foundation festival.
The traditional embedded part is used for manufacturing a supporting foot by using reinforcing steel bars, the using amount of the reinforcing steel bars is large, the processing period is long, the reinforcing steel bar supporting foot cannot be used universally for tower crane foundations of different sizes, and when the levelness is adjusted, a sizing block and a cushion block are inconvenient to use, and the levelness can be controlled only by matching with the assistance of hoisting equipment; and once pre-embedding is completed, in the subsequent upper layer steel bar binding and formwork erecting processes, the local vibration can cause the sizing block to generate micro displacement, so that the levelness is out of control. After the levelness is out of control, the secondary adjustment operation is inconvenient, and the adjustment period is long.
When the prior art is embedded, a reinforcing steel bar supporting foot is generally adopted between the bottom of a fixed supporting leg or an embedded foundation section (generally called an embedded part) and a bottom reinforcing steel bar according to the requirements of an operation specification, and the reinforcing steel bar is bound in a shape like a Chinese character 'ji'. Concrete hollowing is easy to occur on the lower surface of the embedded part and the upper surface of the supporting foot reinforcing steel bar, and the concrete compactness is poor. Directly influences the anti-seismic performance, the compressive property and the bearing performance of the embedded part under the loaded condition, and buries hidden troubles for the safe use of the tower crane.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for avoiding concrete hollowing below an embedded part of a tower crane foundation, which can reduce the hollowing incidence rate, enhance the concrete compactness of a foundation bearing platform, improve the foundation embedding safety and improve the embedding efficiency while ensuring the embedded levelness and the verticality of the tower crane.
In order to solve the technical problem, the invention is realized as follows:
a method for avoiding concrete hollowing below an embedded part of a tower crane foundation is characterized by comprising the following steps:
the method comprises the following steps: construction preparation: preparing an embedded part, a steel plate, a hexagon head M24 bolt not lower than the embedded part, a supporting leg supporting foot, a reinforcing steel bar not lower than phi 22, an alternating current electric welding machine and an oxygen acetylene device, and preparing for the subsequent steps;
step two: blanking: cutting a steel plate into squares by using an oxyacetylene device, wherein the size of the steel plate refers to the size of a bottom plate of an embedded part of a tower crane foundation, and a hole is formed in the center of the steel plate according to the size of an adjusting bolt and a nut;
step three: processing a porous plate: processing the square steel plate and the embedded part bottom plate of the tower crane foundation with the fed material into round holes with uniform sizes by using an oxyacetylene device or other machines;
step four: welding: the adjusting bolt is welded with the porous plate, the porous plate is welded with the supporting leg supporting foot, and the supporting leg supporting foot is welded by using a reinforcing steel bar; the support leg meets the requirement of stability;
step five: installation: sequentially installing a reinforcing supporting leg and an embedded part according to a foundation positioning line, erecting a level gauge, and leveling and aligning the embedded part through an adjusting bolt; the support leg meets the requirements of levelness and verticality;
step six: reinforcing and welding: the supporting legs and the bottom layer ribs are welded in an inclined reinforcing mode through reinforcing steel bars, the embedded parts and the supporting legs are welded in a reinforcing mode through reinforcing steel bars, and the four supporting legs of the embedded parts are welded in a reinforcing mode through reinforcing steel bars; the requirement on the integrity of the component after positioning is met;
step seven: and (4) retesting: after the reinforcement is finished, retesting the levelness and the verticality of the embedded part;
step eight: binding upper-layer ribs and template supports of a tower crane foundation, and concealing and checking;
step nine: pouring concrete, and reinforcing vibration at the position of the embedded support leg;
step ten: and (5) maintaining and checking and accepting the foundation.
The invention has the beneficial effects that: the embedded stabilizer blade of this application or embedded foundation festival four feet utilize the nut to be connected with porous steel sheet, and bolt adjusting device is constituteed with the nut to the screw rod, adjusts the levelness. The levelness adjustment can be completed by the expansion and contraction of the tool adjusting screw rod, the assistance of hoisting machinery is not needed, and then reinforcing steel bars and positioning welding are used. The supporting leg is mainly used for reinforcing and positioning two porous steel plates, reinforcing and positioning embedded parts and foundation lower-layer steel bars and reinforcing supporting legs. The porous steel plate can enable concrete aggregate to pass well, the compactness of concrete is improved, and the occurrence of hollowing is reduced.
The method has the advantages of convenient construction, short period, high levelness control quality, low occurrence rate of concrete hollowing, low manufacturing cost and simple material selection.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic top view of a tower crane foundation pre-buried structure of the invention;
FIG. 2 is a schematic view of a tower crane foundation pre-embedded elevation of the invention;
FIG. 3 is a cross-sectional view of the novel tower crane foundation pre-buried 1-1 of the invention;
fig. 4 is a schematic diagram of the novel tower crane foundation embedded parts.
Detailed Description
As shown in fig. 1-4: a method for avoiding concrete hollowing below an embedded part of a tower crane foundation comprises the following steps:
the method comprises the following steps: construction preparation: preparing an embedded part, a steel plate, a hexagon head M24 bolt not lower than the embedded part, a supporting leg supporting foot, a reinforcing steel bar not lower than phi 22, an alternating current electric welding machine and an oxygen acetylene device, and preparing for the subsequent steps;
step two: blanking: the steel plate is cut into a square by using the oxyacetylene device, the size of the steel plate refers to the size of a bottom plate of an embedded part of a tower crane foundation, and the center of the steel plate is provided with holes according to the sizes of the adjusting bolts 3 and the nuts 2, so that the steel plate can be produced and processed in batch if being used in large quantities.
Step three: the porous plate 1 is processed. And processing the square steel plate and the tower crane foundation embedded part bottom plate which are well fed with materials into round holes with uniform size and diameter of about 5cm by using an oxyacetylene device or other machines so as to facilitate the concrete coarse aggregate to pass through.
Step four: and (6) welding. The adjusting bolt 3 is welded with the porous plate, the porous plate is welded with the supporting leg supporting foot 4, and the supporting leg supporting foot is welded by the reinforcing steel bar 5. This step realizes that the spike satisfies the requirement of stability, and the landing leg spike can adopt materials such as angle steel, square steel or reinforcing bar.
Step five: and (6) mounting. And sequentially installing the reinforcing supporting legs and the embedded parts according to the foundation positioning line. And erecting a level gauge, and leveling and aligning the embedded part through an adjusting bolt. The step realizes that the supporting feet meet the requirements of levelness and verticality.
Step six: and (6) reinforcing and welding. The supporting legs and the bottom layer ribs are welded in an inclined reinforcing mode through reinforcing steel bars, the embedded parts and the supporting legs are welded in a reinforcing mode through reinforcing steel bars, and the four supporting legs of the embedded parts are welded in a reinforcing mode through reinforcing steel bars. This step is favorable to realizing the component wholeness requirement after the location is accomplished.
Step seven: and (6) retesting. And after the reinforcement is finished, retesting the levelness and the verticality of the embedded part.
Step eight: binding the upper-layer ribs 8 of the tower crane foundation, supporting the template, concealing, checking and the like.
Step nine: and (5) pouring concrete 6, and reinforcing vibration at the pre-buried supporting leg part 7.
Step ten: basic maintenance, acceptance inspection and the like.
The first step to the fourth step can be prefabricated in a factory or a warehouse in advance, and the device is suitable for pre-embedding most of fixed foundation towers.
Claims (1)
1. A method for avoiding concrete hollowing below an embedded part of a tower crane foundation is characterized by comprising the following steps:
the method comprises the following steps: construction preparation: preparing an embedded part, a steel plate, a hexagon head M24 bolt not lower than the embedded part, a supporting leg supporting foot, a reinforcing steel bar not lower than phi 22, an alternating current electric welding machine and an oxygen acetylene device, and preparing for the subsequent steps;
step two: blanking: cutting a steel plate into squares by using an oxyacetylene device, wherein the size of the steel plate refers to the size of a bottom plate of an embedded part of a tower crane foundation, and a hole is formed in the center of the steel plate according to the size of an adjusting bolt and a nut;
step three: processing a porous plate: processing the square steel plate and the embedded part bottom plate of the tower crane foundation with the fed material into round holes with uniform sizes by using an oxyacetylene device or other machines;
step four: welding: the adjusting bolt is welded with the porous plate, the porous plate is welded with the supporting leg supporting foot, and the supporting leg supporting foot is welded by using a reinforcing steel bar; the support leg meets the requirement of stability;
step five: installation: sequentially installing a reinforcing supporting leg and an embedded part according to a foundation positioning line, erecting a level gauge, and leveling and aligning the embedded part through an adjusting bolt; the support leg meets the requirements of levelness and verticality;
step six: reinforcing and welding: the supporting legs and the bottom layer ribs are welded in an inclined reinforcing mode through reinforcing steel bars, the embedded parts and the supporting legs are welded in a reinforcing mode through reinforcing steel bars, and the four supporting legs of the embedded parts are welded in a reinforcing mode through reinforcing steel bars; the requirement on the integrity of the component after positioning is met;
step seven: and (4) retesting: after the reinforcement is finished, retesting the levelness and the verticality of the embedded part;
step eight: binding upper-layer ribs and template supports of a tower crane foundation, and concealing and checking;
step nine: pouring concrete, and reinforcing vibration at the position of the embedded support leg;
step ten: and (5) maintaining and checking and accepting the foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375563.5A CN114045860A (en) | 2021-11-19 | 2021-11-19 | Method for preventing concrete under embedded part of tower crane foundation from hollowing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375563.5A CN114045860A (en) | 2021-11-19 | 2021-11-19 | Method for preventing concrete under embedded part of tower crane foundation from hollowing |
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| CN114045860A true CN114045860A (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111375563.5A Pending CN114045860A (en) | 2021-11-19 | 2021-11-19 | Method for preventing concrete under embedded part of tower crane foundation from hollowing |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900098A (en) * | 2012-11-14 | 2013-01-30 | 河南省电力公司信阳供电公司 | Construction process for leveling basic embedded part |
| CN107020696A (en) * | 2017-05-24 | 2017-08-08 | 深圳市鹏城建筑集团有限公司 | A kind of processing method of the precast slab with plane built-in fitting |
| CN109179222A (en) * | 2018-09-29 | 2019-01-11 | 温州建设集团有限公司 | A kind of pre-buried section gradient of derrick crane and levelness control construction method |
-
2021
- 2021-11-19 CN CN202111375563.5A patent/CN114045860A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900098A (en) * | 2012-11-14 | 2013-01-30 | 河南省电力公司信阳供电公司 | Construction process for leveling basic embedded part |
| CN107020696A (en) * | 2017-05-24 | 2017-08-08 | 深圳市鹏城建筑集团有限公司 | A kind of processing method of the precast slab with plane built-in fitting |
| CN109179222A (en) * | 2018-09-29 | 2019-01-11 | 温州建设集团有限公司 | A kind of pre-buried section gradient of derrick crane and levelness control construction method |
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Application publication date: 20220215 |
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