CN113638420B - Deep foundation pit self-flowing energy dissipation concrete pouring method and concrete self-flowing energy dissipation structure - Google Patents
Deep foundation pit self-flowing energy dissipation concrete pouring method and concrete self-flowing energy dissipation structure Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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Abstract
The invention discloses a deep foundation pit self-flowing energy dissipation concrete pouring method, which comprises the steps of adopting a concrete self-flowing energy dissipation structure to pour deep foundation pit concrete; determining the arrangement, the geometric dimension, the thickness and the material of the energy dissipation box and the drainage conduit before construction; sequentially arranging multiple stages of energy dissipation boxes with upper and lower openings at intervals from top to bottom along the depth direction of the deep foundation pit, wherein the multiple stages of energy dissipation boxes are kept consistent in the vertical direction and are connected with a lining wall of the foundation pit through a fixing structure; the energy dissipation boxes are connected through a drainage conduit; after the concrete is poured into the drainage pipe from the upper end, the concrete is finally poured deeply through the discharging pipe at the lowest end through the step-by-step energy dissipation buffer effect of the multistage energy dissipation boxes and the transportation of the drainage pipe. Through the cushioning effect of energy dissipation case and drainage conduit's transportation for the concrete can be followed the earth's surface and transported to deep basal pit stability, keeps good property and control flow rate less, in order to reduce the impact that the concrete was pour bottom the deep basal pit, guarantees that concrete nature form satisfies the construction requirements.
Description
Technical Field
The invention relates to a foundation pit construction method, in particular to a deep foundation pit self-flowing energy dissipation concrete pouring method.
Background
With the increasingly rapid urbanization process in China, the urban scale and the population number are correspondingly rapidly increased, and the urban land is increasingly tense. In order to relieve the problems of urban overground resource shortage, traffic congestion and the like, buildings are gradually developed further to the air and underground. Various buildings and structures such as high-rise buildings, even super high-rise buildings, underground parking lots, underground shopping malls, underground stations and the like are rapidly developed. In order to meet the construction requirements, the excavation depth of the foundation pit is generally increased, the excavation scale of the foundation pit is enlarged, and corresponding construction problems are continuously developed.
In the construction of general foundation ditch, accessible pipeline directly transports the concrete to the foundation ditch bottom from the earth's surface, can carry out normal pouring work. However, when the depth of the foundation pit is large, if the concrete is transported by the conventional method, the concrete generates large kinetic energy due to the gravity acting in the transportation process, i.e. the flowing speed is too high. The impact force of the high flow rate concrete will affect the normal pouring work of the concrete. In addition, too high flowing speed can cause the concrete property to change, further affecting the construction quality, causing serious even construction accidents, and affecting the normal use of the structure.
In order to solve the problem of high flow speed caused by the fact that a foundation pit is deep during pouring of the deep foundation pit and ensure the properties of concrete, the invention provides a simple and reliable pouring method for weakening the gravity flow kinetic energy of the concrete of the deep foundation pit based on a novel structure, so that the construction risk is reduced and the construction quality is improved.
Disclosure of Invention
Aiming at the prior art, the invention provides a self-flowing energy dissipation concrete pouring method suitable for a deep foundation pit, which is mainly based on a concrete self-flowing energy dissipation structure and a concrete drainage conduit, and aims to solve the problem that the self-flowing speed of concrete is too high when the concrete is transported in the deep foundation pit, reduce pouring impact force and ensure the properties of the concrete.
In order to solve the technical problems, the deep foundation pit concrete pouring method through the concrete self-flowing energy dissipation structure comprises the following steps:
firstly, before construction, constructors configure concrete according to construction requirements and determine the maximum flow rate of concrete pouring and properties to be achieved;
determining the arrangement density, the geometric dimension, the thickness and the material of the energy dissipation box according to the depth of the foundation pit and the properties of the concrete, and determining the pipe diameter, the pipe wall thickness and the material of the drainage pipe according to the arrangement density, the properties and the physical properties of the energy dissipation box;
thirdly, sequentially arranging a plurality of stages of energy dissipation boxes with upper and lower openings at intervals from top to bottom along the depth direction of the deep foundation pit according to the arrangement density of the energy dissipation boxes, wherein a drainage conduit communicated with the energy dissipation boxes is connected between the top of the uppermost energy dissipation box and the energy dissipation boxes adjacent to each other up and down; the multistage energy dissipation boxes are kept consistent in the vertical direction;
step four, connecting all the energy dissipation boxes with the lining wall of the foundation pit through a fixing structure; a discharge pipe leading to an underground deep layer is arranged at the bottom of the lowest end energy dissipation box;
and fifthly, concrete pouring is carried out, after the concrete is poured into the drainage guide pipe from the uppermost end, the concrete with higher kinetic energy flowing into the drainage guide pipe from the uppermost end sequentially passes through the step-by-step energy dissipation buffer action of the multistage energy dissipation box and the transportation of the drainage guide pipe, and finally the concrete is poured to the bottom plate of the underground deep layer through the discharge pipe at the lowermost end.
Meanwhile, the invention also provides a concrete self-flowing energy dissipation structure for realizing the deep foundation pit self-flowing energy dissipation concrete pouring method, which comprises energy dissipation boxes sequentially arranged at intervals from top to bottom along the depth direction of the deep foundation pit, wherein each energy dissipation box is provided with an upper opening and a lower opening, and a drainage conduit communicated with the energy dissipation box is connected between the top of the uppermost energy dissipation box and the energy dissipation boxes adjacent to each other from top to bottom; all the energy dissipation boxes are connected with the lining wall of the foundation pit through the fixing structure; the bottom of the lowest energy dissipation box is provided with a discharge pipe leading to the underground deep layer.
Further, the deep foundation pit self-flowing energy dissipation concrete pouring method provided by the invention comprises the following steps:
the inlet of the drainage catheter with the uppermost end positioned on the ground surface is provided with a drainage funnel to ensure that concrete uniformly flows into the drainage catheter, and the size, the thickness and the material of the drainage funnel are determined according to the self-flow speed of the concrete (the self-flow speed is less than the maximum concrete pouring flow speed).
The energy dissipation box is made of metal materials, preferably steel materials.
The axial direction of the drainage catheter is the vertical direction; or the axial direction of the drainage catheter and the depth direction of the deep foundation pit form an included angle of 25-35 degrees, and the inclination directions of all the drainage catheters are consistent.
The fixing structure between the energy dissipation box and the inner lining wall is a triangular support so as to prevent the energy dissipation box from changing position when concrete impacts, and the fixing structure is fixedly connected with the inner lining wall of the foundation pit by an anchoring structure.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a concrete self-flow speed reducing device which effectively solves the problem of larger impulsive force caused by too high self-flow speed when the deep foundation pit conveys concrete, ensures the property of the concrete, is convenient for construction and ensures the construction quality. The deep foundation pit self-flowing energy dissipation concrete pouring method is simple in construction process and structure, and the speed reduction effect meets the requirement.
Drawings
Figure 1 is a front view of an energy dissipation structure and drainage conduits installed between a diaphragm wall and a formation;
figure 2 is a side view of the dissipater and drainage duct arrangement of figure 1;
figure 3 is a front view of an energy dissipating structure used in the present invention;
FIG. 4 is a schematic view of concrete flow based on energy dissipation structures and drainage conduits in the present invention;
in the figure:
1-drainage funnel 2-drainage catheter 3-energy dissipation box 4-fixed structure
5-stratum 6-inner lining wall 7-bottom plate 8-anchoring structure
Detailed Description
The design concept of the deep foundation pit self-flowing energy dissipation concrete pouring method provided by the invention is as follows: carry out deep basal pit concrete placement through adopting the concrete dissipation structure that flows automatically, the higher kinetic energy concrete that flows in from upper portion drainage pipe passes through the cushioning effect of multistage energy dissipation case, makes the kinetic energy of concrete reduce to carry to the lower part through the drainage pipe of lower part, the energy dissipation step by step. The energy dissipation box is connected with the inner lining wall through a triangular fixing structure so as to ensure that the energy dissipation box can still ensure the fixed position when bearing larger impact force. A drainage funnel is arranged at the inlet of the surface drainage catheter, so that concrete can conveniently flow into the drainage catheter and can be transported to the underground deep layer. Through the cushioning effect of energy dissipation case and the transportation of drainage pipe for the concrete can keep good property and the control velocity of flow less from earth's surface to the stable transportation of deep basal pit, with the impact that reduces the concrete and pour the deep basal pit bottom, guarantees that the concrete property form satisfies the construction requirement. The concrete self-flow energy dissipation structure adopted in the invention is simple, the construction is convenient, and the concrete pouring requirement of the deep foundation pit can be met.
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
The concrete gravity energy dissipation structure for realizing the deep foundation pit gravity energy dissipation concrete pouring method comprises energy dissipation boxes 3 which are sequentially arranged from top to bottom at intervals along the depth direction of a deep foundation pit, wherein each energy dissipation box 3 is provided with an upper opening and a lower opening, and a drainage conduit 2 communicated with each energy dissipation box 3 is connected between the top of the uppermost energy dissipation box 3 and the energy dissipation boxes 3 which are adjacent to each other from top to bottom; all the energy dissipation boxes 3 are connected with an inner lining wall 6 of a supporting stratum 5 through fixing structures 4, the fixing structures 4 are triangular supports, the fixing structures 4 are fixedly connected with the inner lining wall 6 through anchoring structures 8, as shown in figures 3 and 4, so that the energy dissipation boxes 3 are prevented from position change when concrete impacts, and discharge pipes poured from underground deep bottom plates 7 are arranged at the bottoms of the energy dissipation boxes 3 at the lowest ends. The arrangement density (namely, the distance), the geometric dimension, the thickness and the material of the energy dissipation boxes 3 can be reasonably set according to the construction conditions such as the concrete pouring requirement, the concrete property, the depth of a foundation pit and the like, and the wall thickness of the energy dissipation boxes 3 can be properly increased so as to reduce the deformation caused by the concrete impact.
As shown in fig. 3, the drainage tube 2 provides a passage for concrete to flow, and the axial direction of the drainage tube is vertical; or the axial direction of the drainage guide pipes 2 and the depth direction of the deep foundation pit form an included angle of 25-35 degrees, and the inclination directions of all the drainage guide pipes 2 are consistent, so that the energy dissipation structures are kept consistent in the vertical direction. The drainage catheter 2 can be made of metal materials, and the pipe diameter and the pipe wall thickness of the drainage catheter 2 can be reasonably set according to construction conditions such as concrete pouring requirements, concrete properties and foundation pit depth. As shown in fig. 1 and 2, a drainage funnel 1 is provided at an entrance of a drainage tube 2 located on the ground surface at the uppermost end to ensure that concrete uniformly flows into the drainage tube, and the size, thickness and material of the drainage funnel 1 are determined according to the gravity flow rate of the concrete.
The method for pouring the self-flowing energy dissipation concrete of the deep foundation pit by using the self-flowing energy dissipation concrete structure provided by the invention comprises the following steps:
before construction, constructors configure concrete according to construction requirements and determine the maximum flow rate of concrete pouring and properties to be achieved. And determining the arrangement density, the geometric dimension, the thickness and the material of the energy dissipation boxes 3 according to the depth and the concrete property of the foundation pit. Determining the pipe diameter, the pipe wall thickness and the material of the drainage pipe 2 according to the arrangement density, the concrete property and the physical property of the energy dissipation box 3; the size, thickness and material of the drainage funnel 1 are determined according to the self-flowing speed of the concrete.
In this example, the maximum flow velocity V of the concrete is takenmax10 m/s. According to the energy conversion formula, the gravitational potential energy is converted into concrete flow kinetic energy:
maximum flow velocity V allowed for concretemaxThe length h of the available drainage catheter 2 is substituted by 10 m/s:
the length H of the obtained drainage conduit 2 is the longest length, the arrangement density (namely the distance) of the energy dissipation boxes 3 is 5 m/number, and if the depth H of the foundation pit is 60m, the arrangement number n of the energy dissipation boxes 3 is as follows:
assuming that the inner diameter D of the drainage catheter 2 is 0.1m, the thickness t of the tube wall is 0.005m, and the material is stainless steel. From this the volume V of the single drainage catheter 2 can be calculated:
the energy dissipater 3 can thus be dimensioned. The length (L) × width (B) of the energy dissipation box 3 is assumed to be 0.3m × 0.3m, and the thickness is assumed to be 0.01 m. The minimum height h of the energy dissipation box 3 can be calculated according to the volume V of the single drainage pipe 2x_min：
Meanwhile, the safety coefficient f can be increased, and the design height h of the energy dissipation box 3 is increasedx：
hx＝fhx_min＝1.2×0.45＝0.54m
At this time, the height of the drainage pipe 2 and the energy dissipation box 3 is greater than the depth H of the foundation pit, and the drainage pipe 2 can be obliquely arranged as shown in figures 3 and 4.
The maximum size of the drainage funnel 1 can be calculated according to the depth H of the foundation pit and the inner diameter D of the drainage catheter 2. Assuming that the drainage funnel 1 is long (L)y) X width (B)y) 1m × 1m, the height of the drainage funnel is:
the thickness of the drainage funnel 1 is set to be 0.01m, and the material is selected from stainless steel.
In this embodiment, according to the above design, 12 energy dissipation boxes, 13 drainage pipes (one of them is the discharging pipe) and 1 drainage funnel are made of stainless steel. Wherein: the size of the energy dissipation box is as follows: length × width × height is 0.3 × 0.54m, and thickness is 0.01 m; the dimensions of the drainage catheter are: the length is 5m, the pipe diameter is 0.1m, and the pipe wall thickness is 0.005 m. The dimensions of the drainage funnel are: length × width × height is 1m × 1m × 0.47m, and the thickness is 0.01 m.
Arranging 1 energy dissipation boxes 3 with upper and lower holes according to the arrangement density of the energy dissipation boxes 3 at intervals of 5m from top to bottom in sequence along the depth (60m) direction of a deep foundation pit, and installing a fixing structure 4 at the position below each energy dissipation box 3 according to the normal pouring requirement of the foundation pit, wherein the fixing structure 4 is a triangular support and is connected with a lining wall 6 through an anchoring structure 8, so that the energy dissipation boxes 3 and the anchoring structure 8 are fixed, in the embodiment, the anchoring structure 8 is made of iron, and the length can be selected to be 0.3m or more. Insert drainage pipe 2 with energy dissipation case 3 upper and lower both ends to from last to connecting gradually down, in this embodiment, the axial of drainage pipe 2 and deep basal pit depth direction have 30 contained angles and all drainage pipe 2's incline direction unanimous, thereby make multistage energy dissipation case 3 keep unanimous in vertical direction. The top of the uppermost drainage guide pipe 2 is provided with a drainage funnel 1, and the bottom of the lowermost energy dissipation box 3 is provided with a discharge pipe for pouring an underground deep bottom plate 7.
Implementing concrete pouring, pouring predetermined concrete into the drainage funnel 1 according to requirements, pouring the concrete into the inlet of the drainage conduit 2 which is positioned on the earth surface from the uppermost end, arriving at the energy dissipation box 3 to slow down the flow velocity, and flowing into the drainage conduit 2 at the lower part of the energy dissipation box 3 to transport towards the deep part of the foundation pit, so as to slow down the flow velocity in the energy dissipation box 3 at the lower part (the next stage), so as to analogize the flow downwards step by step, the concrete flows in from the drainage conduit 2 at the uppermost end, the concrete with higher kinetic energy sequentially passes through the step-by-step energy dissipation buffer action of the multistage energy dissipation box 3 and the transportation of the drainage conduit 2, and flows out from the discharge pipe at the bottom of the energy dissipation box 3 at the lowermost end until the concrete pouring position is reached.
By adopting the deep foundation pit self-flowing energy dissipation concrete pouring method for construction, the problem of large kinetic energy during deep foundation pit concrete transportation can be solved, the impact force of concrete is reduced, the properties of the concrete are kept, the pouring requirement is met, and the construction quality is ensured.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (8)
1. The deep foundation pit self-flowing energy dissipation concrete pouring method is characterized in that the deep foundation pit concrete pouring is carried out by adopting a concrete self-flowing energy dissipation structure, and the method comprises the following steps:
firstly, before construction, constructors configure concrete according to construction requirements and determine the maximum flow rate of concrete pouring and properties to be achieved;
determining the arrangement density, the geometric dimension, the thickness and the material of the energy dissipation boxes (3) according to the depth of the foundation pit and the properties of the concrete, and determining the pipe diameter, the pipe wall thickness and the material of the drainage pipe (2) according to the arrangement density, the properties and the physical properties of the energy dissipation boxes (3);
thirdly, sequentially arranging a plurality of stages of energy dissipation boxes (3) with upper and lower holes at intervals from top to bottom along the depth direction of the deep foundation pit according to the arrangement density of the energy dissipation boxes (3), wherein a drainage conduit (2) communicated with the energy dissipation boxes (3) is connected between the top of the uppermost energy dissipation box (3) and the vertically adjacent energy dissipation boxes (3), the axial direction of the drainage conduit (2) and the depth direction of the deep foundation pit form an included angle of 25-35 degrees, the inclination directions of all the drainage conduits (2) are consistent, and the length of the drainage conduit is h, and the calculation is as follows:
maximum flow velocity of concrete VmaxAccording to the energy conversion formula, the gravitational potential energy is converted into the concrete flow kinetic energy:
maximum flow velocity V allowed for concretemaxAs the v in the above formula, a,
the multi-stage energy dissipation boxes are kept consistent in the vertical direction;
step four, all the energy dissipation boxes (3) are connected with the inner lining wall (6) through the fixing structures (4); a discharge pipe leading to an underground deep layer is arranged at the bottom of the lowest end energy dissipation box (3);
and fifthly, concrete pouring is carried out, after the concrete is poured into the drainage guide pipe (2) positioned on the ground surface from the uppermost end, the concrete with higher kinetic energy flowing into the drainage guide pipe (2) from the uppermost end sequentially passes through the step-by-step energy dissipation buffer effect of the multi-stage energy dissipation box (3) and the transportation of the drainage guide pipe, and finally the concrete is poured into the bottom plate (7) of the underground deep layer through the discharge pipe at the lowermost end.
2. The method for casting the self-flowing energy-dissipating concrete for the deep foundation pit according to claim 1, wherein a drainage funnel (1) is provided at an inlet of the drainage pipe (2) positioned at the surface of the earth at the uppermost end, and the size, thickness and material of the drainage funnel (1) are determined according to the self-flowing speed of the concrete.
3. The method for pouring self-flowing energy-dissipating concrete for the deep foundation pit according to claim 1, wherein the energy-dissipating boxes (3) are made of metal.
4. The method for pouring self-flowing energy-dissipating concrete for deep foundation pits according to claim 2, wherein the energy-dissipating boxes (3) are made of steel.
5. The method for pouring the self-flowing energy-dissipating concrete for the deep foundation pit as claimed in claim 1, wherein the fixed structure (4) is a triangular support, and the fixed structure (4) is fixedly connected with the inner lining wall (6) by an anchoring structure (8).
6. The concrete self-flow energy dissipation structure for realizing the deep foundation pit self-flow energy dissipation concrete pouring method according to any one of claims 1 to 5 is characterized by comprising energy dissipation boxes (3) which are sequentially arranged from top to bottom at intervals along the depth direction of the deep foundation pit, wherein each energy dissipation box (3) is provided with an upper opening and a lower opening, a drainage conduit (2) which is communicated with the energy dissipation boxes (3) is connected between the top of the uppermost energy dissipation box (3) and the energy dissipation boxes (3) which are adjacent to each other up and down, an included angle of 25-35 degrees is formed between the axial direction of each drainage conduit (2) and the depth direction of the deep foundation pit, the inclination directions of all the drainage conduits (2) are consistent, and the length of each drainage conduit is h, and the calculation is as follows:
maximum flow velocity of concrete VmaxAccording to the energy conversion formula, the gravitational potential energy is converted into the concrete flow kinetic energy:
maximum flow velocity V allowed by concretemaxAs the v in the above formula, a,
all the energy dissipation boxes (3) are connected with the inner lining wall (6) through the fixing structures (4); the bottom of the lowest energy dissipation box (3) is provided with a discharge pipe leading to the underground deep layer.
7. A concrete gravity flow energy dissipating structure according to claim 6 wherein a drainage funnel (1) is provided at the inlet of the uppermost drainage pipe (2) at the surface; the size, the thickness and the material of the drainage funnel (1) are determined according to the self-flowing speed of the concrete.
8. The concrete gravity flow energy dissipation structure according to claim 7, wherein the arrangement density, the geometric dimension, the thickness and the material of the energy dissipation boxes (3) are determined according to the depth of a foundation pit and the properties of concrete, and the pipe diameter, the pipe wall thickness and the material of the drainage pipes (2) are determined according to the arrangement density, the properties and the physical properties of the energy dissipation boxes (3).
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| CN202111125735.3A CN113638420B (en) | 2021-09-26 | 2021-09-26 | Deep foundation pit self-flowing energy dissipation concrete pouring method and concrete self-flowing energy dissipation structure |
| LU502171A LU502171B1 (en) | 2021-09-26 | 2022-05-25 | Method for pouring artesian energy-dissipating concrete to deep foundation pit and concrete automatic-flow energy-dissipating structure |
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| CN202111125735.3A CN113638420B (en) | 2021-09-26 | 2021-09-26 | Deep foundation pit self-flowing energy dissipation concrete pouring method and concrete self-flowing energy dissipation structure |
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| JP2019127736A (en) * | 2018-01-24 | 2019-08-01 | 株式会社大林組 | Pile construction method |
| CN213539748U (en) * | 2020-09-25 | 2021-06-25 | 重庆建工第十一建筑工程有限责任公司 | Direct-discharging type chute for concrete pouring |
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2021
- 2021-09-26 CN CN202111125735.3A patent/CN113638420B/en active Active
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2022
- 2022-05-25 LU LU502171A patent/LU502171B1/en active IP Right Grant
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203174610U (en) * | 2013-04-23 | 2013-09-04 | 葛洲坝集团第六工程有限公司 | Three-stage falling type chute barrel device |
| CN104372796A (en) * | 2014-11-10 | 2015-02-25 | 中建城市建设发展有限公司 | Ultra fast buffer forked type concrete pouring string pipe and construction method thereof |
| CN204212157U (en) * | 2014-11-10 | 2015-03-18 | 中建城市建设发展有限公司 | Supper-fast buffering dichotomous concreting string pipe |
| CN204298828U (en) * | 2014-11-18 | 2015-04-29 | 中国建筑第八工程局有限公司 | Foundation ditch concreting elephant trunk cushioning control structure |
| JP2019127736A (en) * | 2018-01-24 | 2019-08-01 | 株式会社大林組 | Pile construction method |
| CN108301416A (en) * | 2018-04-20 | 2018-07-20 | 北京城建集团有限责任公司 | Large volume, deep basal pit bottom rotary type appts. for transferring ready-mixed concrete and its application process |
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| CN113638420A (en) | 2021-11-12 |
| LU502171B1 (en) | 2022-11-25 |
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Effective date of registration: 20221213 Address after: No. 3199, Tanggu new North Road, Binhai New Area, Tianjin, 300459 Patentee after: CHINA RAILWAY 18TH CONSTRUCTION BUREAU (GROUP) THE 5TH ENGINEERING Ltd. Patentee after: CHINA RAILWAY 18 BUREAU GROUP Co.,Ltd. Patentee after: CHINA RAILWAY 18TH BUREAU GROUP CONSTRUCTION AND INSTALLATION ENGINEERING CO.,LTD. Address before: No. 3199, Tanggu new North Road, Binhai New Area, Tianjin, 300459 Patentee before: CHINA RAILWAY 18TH CONSTRUCTION BUREAU (GROUP) THE 5TH ENGINEERING Ltd. |