CN114960667A - Steel pipe support erection construction process - Google Patents
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- CN114960667A CN114960667A CN202210538487.3A CN202210538487A CN114960667A CN 114960667 A CN114960667 A CN 114960667A CN 202210538487 A CN202210538487 A CN 202210538487A CN 114960667 A CN114960667 A CN 114960667A
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- E—FIXED CONSTRUCTIONS
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Abstract
The invention discloses a steel pipe support erection construction process, which comprises the steps of determining a design index of the steel pipe support construction process, and determining a jack oil pressure pre-load value according to a design pre-load value and a corresponding super-load coefficient; the steel pipe and the movable head are propped open by a jack, when the stable oil pressure reading of the jack is not lower than the oil pressure reading limit value, the length of a connecting gap is generated between the movable head and the steel pipe, and the rectangular steel tenon, the fixed wedge-shaped steel tenon and the movable wedge-shaped steel tenon are filled; driving the movable wedge-shaped steel tenon and locking the steel tenon; measuring the exposure height of the movable wedge-shaped steel tenons, calculating the driving-in ratio of the wedge-shaped steel tenons, and checking whether the driving-in ratio of the wedge-shaped steel tenons is smaller than the design value of the driving-in ratio of the wedge-shaped steel tenons or not; if the driving ratio of the wedge-shaped steel tenon is smaller than the design value of the driving ratio of the wedge-shaped steel tenon, increasing the stable reading of the oil pressure of the jack, and increasing the length of a connecting gap between the loose head and the steel pipe; and if the driving ratio of the wedge-shaped steel tenon is not less than the design value of the driving ratio of the wedge-shaped steel tenon, removing the pressure of the jack. The invention can increase the safety of the supporting structure.
Description
Technical Field
The invention relates to a support erection construction process, in particular to a steel pipe support erection construction process.
Background
For deep foundation pits with multiple layers of supports, the support erection conditions in the excavation process of each layer of soil are all important factors influencing the deformation of the building envelope. Because of high water content and low strength of soil in soft soil area, the soil is produced after excavation unloadingThe pressure of the generated active soil is large, so that the deformation is increased due to the fact that the pre-axial force of the steel pipe support is smaller or the support rigidity is lower after the steel pipe support is erected. The quality of the erection construction of the steel pipe support at present has important influence on the safety of foundation pit support. The specification does not clearly stipulate the axial force bearing capacity of the steel pipe support or a determination method, engineers usually regard the steel pipe support as a compression problem according to the Steel Structure design Standard (GB50017-2017), and determine the compression yield bearing capacity of the steel pipe according to an axial compression member; it is generally considered that
The supporting and bearing capacity of the steel pipe with the wall thickness t equal to 16mm is 3000 kN; the influence of the critical plastic limit value of the connecting steel tenon on the steel pipe supporting axial force is not considered, so that an example that the foundation pit is unstable and collapses due to insufficient bearing capacity of the steel pipe is provided. In addition, the steel pipe support erection construction quality can also influence the instability of steel pipe support rigidity, which is far less than the axial compression rigidity of a steel pipe, so that the phenomena of prestress attenuation, discrete actual axial force value in the excavation process and poor regularity occur.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a steel pipe support erection construction process, which ensures that the axial force bearing capacity and the pre-stressing force of a steel pipe support meet the design requirements, and further increases the safety of a supporting structure.
The technical scheme is as follows: the invention comprises the following steps:
step (1), determining the design index of the steel pipe support construction process, including the bearing capacity N of the steel pipe support a Design pre-stress value N d Design value alpha of wedge-shaped steel tenon driving ratio d And the depth h of the gap between the flexible head and the steel pipe;
step (2), pre-stress value N is added according to design d And corresponding super-adding coefficient theta, determining the jack oil pressure pre-adding value N 0 Requiring a jack oil pressure preload value N 0 Not greater than the buckling bearing capacity N max Determining an oil pressure reading limit value according to the calibration relation between the load of the jack and the oil pressure;
step (3), a jack is used for opening the steel pipe and the adjustable head, when the oil pressure stable reading of the jack is not lower than the oil pressure reading limit value, the length of a connecting gap is generated between the adjustable head and the steel pipe, and the rectangular steel tenon, the fixed wedge-shaped steel tenon and the movable wedge-shaped steel tenon are filled;
step (4), driving in the movable wedge-shaped steel tenon and locking the steel tenon;
step (5), measuring the exposure height of the movable wedge-shaped steel tenon, calculating the driving-in ratio alpha of the wedge-shaped steel tenon, and checking whether the driving-in ratio alpha of the wedge-shaped steel tenon is smaller than the design value alpha of the driving-in ratio of the wedge-shaped steel tenon d ；
Step (6), if the driving ratio alpha of the wedge-shaped steel tenon is smaller than the design value alpha of the driving ratio of the wedge-shaped steel tenon d Increasing the stable reading of the jack oil pressure to increase the length of a connecting gap between the movable head and the steel pipe, repeating the steps (4) to (6), and otherwise, entering the next step;
step (7), if the driving ratio alpha of the wedge-shaped steel tenon is not less than the design value alpha of the driving ratio of the wedge-shaped steel tenon d And the pressure of the jack is removed, and the steel pipe support erection is completed.
The driving ratio alpha is as follows:
in the formula: alpha is wedge-shaped steel tenon driving ratio; h is the depth of a cavity between the loose head and the steel pipe; h' is the complementary effective height of the wedge-shaped steel tenon; s is the exposure height of the movable wedge-shaped steel tenon, and the driving-in ratio alpha is 0-1.
The actual value of the axial compressive rigidity of the steel pipe support is determined by reducing the axial compressive rigidity of the steel pipe:
k′ R ＝κ·k R
in the formula: k is a reduction coefficient related to the dovetail driving ratio alpha; k is a radical of R The axial compressive rigidity of the steel pipe support is not considered when the wedge-shaped steel tenon driving ratio alpha is not considered; k' R In order to consider the axial compressive rigidity of the steel pipe support after the wedge-shaped steel tenon is driven into the steel pipe support with the driving ratio alpha.
The jack oil pressure pre-stress value N 0 And effective pre-stress value N 1 The difference is the axial force loss value; the effective preload valueN 1 Pre-load value N with jack oil pressure 0 The ratio is the preservation rate of axial force mu, mu is N 1 /N 0 。
The oil pressure pre-stress super-addition coefficient theta of the jack is as follows:
in the formula: mu-axial force retention.
The jack oil pressure pre-stress value is as follows:
N 0 ≥N d θ
the wedge-shaped steel tenon driving ratio design value alpha d Not less than 0.7.
The steel pipe supports by buckling bearing capacity N max And the temporary plastic bearing capacity N of the connecting steel tenon p Jointly determining:
N p ＝a·h·α·σ s -b
in the formula, N a Supporting the bearing capacity of the steel pipe; n is a radical of max The bearing capacity of the buckling is improved; n is a radical of p Is the plastic bearing capacity (kN); a is the section width of the connecting steel tenon; alpha is wedge-shaped steel tenon driving ratio; h is the height of the section of the connecting steel tenon; sigma s The yield strength of the connecting steel tenon material; and b is a corrected value of the bearing capacity in consideration of the plastic state of the connecting steel tenon.
The design preload value N d Is not more than the temporary plastic bearing capacity N p 。
Has the advantages that: the invention provides design indexes and construction quality indexes of a steel pipe support construction process, and provides quantitative indexes for construction quality evaluation of steel pipe support erection; providing a construction method for compensating the loss of prestress by using the added value of the oil pressure prestress of the jack; the bearing capacity of the steel pipe support is provided with a small value of the bearing capacity of the axial compression stability and the temporary plastic bearing capacity; the temporary plastic bearing capacity and the wedge-shaped steel tenon driving ratio alpha are in a linear positive correlation, the quantitative relation between the steel pipe support bearing capacity and the construction quality is established, the steel pipe support design index and the construction erection quality index are standardized, the matching degree of design and construction is improved, the engineering quality detection method for steel pipe support erection is determined, the axial bearing capacity and the pre-stress of the steel pipe support are ensured to meet the design requirements, and the safety of the supporting structure is further improved.
Drawings
FIG. 1 is a schematic view of the present invention with the jack pre-stressed;
FIG. 2 is a schematic view of the present invention after the locking of the steel tenon;
FIG. 3 is a schematic drawing showing the degree of wedge-shaped tenon driving according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 3, the steel pipe support of the invention comprises a steel pipe 1 and a movable head 2, a steel tenon is connected between the steel pipe 1 and the movable head 2, the steel tenon comprises a rectangular steel tenon 6, a fixed wedge-shaped steel tenon 4 and a movable wedge-shaped steel tenon 5, and the section of the steel tenon is small relative to the section of the steel pipe, so that the axial compression rigidity of the support is reduced, the prestress loss degree is increased, and the steel pipe support is a key part and a weak part of the steel pipe support. The rectangular steel tenon 6 is a component for adjusting the length of a cavity between the steel pipe 1 and the loose head 2, the fixed wedge-shaped steel tenon 4 and the movable wedge-shaped steel tenon 5 form a pair of complementary wedge-shaped steel tenons, and the complementary degree determines the supporting and bearing capacity of the steel pipe. The wedge-shaped steel tenon complementary degree can be expressed by a driving ratio alpha which is:
α＝h′/h (1)
in the formula: alpha is wedge-shaped steel tenon driving ratio; h is the depth of a cavity between the loose head and the steel pipe; h' is the complementary effective height of the wedge-shaped steel tenon, and the driving ratio alpha is a value between 0 and 1, so that the bearing capacity of the steel pipe support and the driving ratio alpha of the wedge-shaped steel tenon are positively correlated. By measuring the exposed height S of the movable wedge-shaped steel tenon, the steel tenon driving ratio alpha can be calculated:
wherein S is the exposure height of the movable wedge-shaped steel tenon.
The axial compressive rigidity of the steel pipe support is positively correlated with the wedge-shaped steel tenon driving ratio alpha, and the actual value of the axial compressive rigidity of the steel pipe support is determined by reducing the axial compressive rigidity of the steel pipe:
k′ R ＝κ·k R (3)
in the formula: k is a reduction coefficient related to the dovetail driving ratio alpha; k is a radical of R The axial compressive rigidity of the steel pipe support is not considered when the wedge-shaped steel tenon driving ratio alpha is not considered; k' R In order to consider the axial compressive rigidity of the steel pipe support after the wedge-shaped steel tenon is driven into the steel pipe support with the driving ratio alpha.
Design indexes of steel pipe support construction process comprise steel pipe support bearing capacity N a Design pre-stress value N d Jack oil pressure pre-stress value N 0 Design value alpha of wedge-shaped steel tenon driving ratio d Design value of wedge-shaped steel tenon driving ratio alpha d Not less than 0.7.
The construction quality index of the steel pipe support construction process comprises jack oil pressure pre-stress value N 0 Wedge-shaped steel tenon driving ratio alpha and effective prestress N 1 (ii) a Wherein the jack oil pressure pre-stress value N 0 The axial force value applied to the steel pipe support and the adjustable joint by jack oil pressure is not more than the stable bearing capacity of the steel pipe in buckling; when the connecting steel tenon is locked and the jack 3 releases the pressure, the steel pipe support, the loose head 2 and the connecting steel tenon are subjected to stress redistribution, so that the axial force attenuation occurs, and the stabilized axial force is the effective prestress N 1 Should not be less than the design prestress N d (ii) a The driving ratio alpha of the wedge-shaped steel tenon is not less than the design value alpha of the driving ratio of the wedge-shaped steel tenon d (ii) a The difference between the pre-load value of the jack oil pressure and the effective pre-load value is the loss value of the axial force (N) 0 -N 1 ) (ii) a The ratio of the effective pre-stress value to the jack oil pressure pre-stress value is the axial force retention rate mu, mu is N 1 /N 0 。
The axial force loss is compensated by the added value of the jack oil pressure pre-added force, and the effective pre-added force value is not less than the design pre-added force value N d . The oil pressure pre-stress super-adding coefficient theta of the jack is as follows:
in the formula: mu-axial force retention, related to dovetail driving ratio alpha, can be measured by field testing. Thus, the jack oil pressure pre-stress value is as follows:
N 0 ≥N d θ (5)
the steel pipe support should meet the buckling bearing capacity N determined by the stability of the steel pipe not more than axial compression max The requirement of (2) also meets the bearing capacity determined by the temporary plastic yield of the connecting steel tenon, namely the temporary plastic bearing capacity N p Thus, the steel pipe support is supported by the buckling bearing capacity N max And the temporary plastic bearing capacity N of the connecting steel tenon p Jointly determining:
N p ＝a·h·α·σ s -b
in the formula: n is a radical of a Supporting the bearing capacity of the steel pipe; n is a radical of max The bearing capacity of the buckling is improved; n is a radical of p Is the plastic bearing capacity (kN); a is the section width of the connecting steel tenon, and a is 40 mm; alpha is wedge-shaped steel tenon driving ratio; h is the height of the section of the connecting steel tenon, and h is 300 mm; sigma s For joining the yield strength, sigma, of the material of the tenon s 0.235 GPa; and b is a corrected value of the bearing capacity in consideration of the plastic state of the connecting steel tenon.
When the driving ratio alpha of the wedge-shaped steel tenon is not less than the design value alpha of the driving ratio of the wedge-shaped steel tenon d And in the process, the supporting bearing capacity of the steel pipe is not lower than the designed value.
The specific construction process comprises the following steps:
step (1), determining the design index of the steel pipe support construction process, including the bearing capacity N of the steel pipe support a Design pre-stress value N d Design value alpha of wedge-shaped steel tenon driving ratio d And the depth h of the gap between the flexible head and the steel pipe, the design of a pre-stress value N is required d Is not more than the temporary plastic bearing capacity N p Wedge-shaped steel tenon driving ratioDesign value of alpha d Not less than 0.7;
step (2), pre-stress value N is added according to design d And the corresponding super-adding coefficient theta, and determining the jack oil pressure pre-adding value N by the formula (5) 0 Requiring a jack oil pressure preload value N 0 Not greater than the buckling bearing capacity N max Determining an oil pressure reading limit value according to the calibration relation between the load of the jack and the oil pressure;
step (3), a jack is used for opening the steel pipe and the adjustable head, when the oil pressure stable reading of the jack is not lower than the oil pressure reading limit value, the length L of a connecting gap is generated between the adjustable head and the steel pipe, and a plurality of rectangular steel tenons, a fixed wedge-shaped steel tenon and a movable wedge-shaped steel tenon are filled;
step (4), driving in the movable wedge-shaped steel tenon and locking the steel tenon;
step (5), measuring the exposure height S of the movable wedge-shaped steel tenon, calculating the wedge-shaped steel tenon driving-in ratio alpha according to the formula (2), and checking whether the wedge-shaped steel tenon driving-in ratio alpha is smaller than the design value alpha of the wedge-shaped steel tenon driving-in ratio d ；
Step (6), if the driving ratio alpha of the wedge-shaped steel tenon is smaller than the design value alpha of the driving ratio of the wedge-shaped steel tenon d If so, increasing the stable reading of the jack oil pressure to increase the length of a connecting gap between the movable head and the steel pipe, repeating the steps (4) to (6), and if not, entering the next step;
step (7), if the driving ratio alpha of the wedge-shaped steel tenon is not less than the design value alpha of the driving ratio of the wedge-shaped steel tenon d And the pressure of the jack is removed, and the steel pipe support erection is completed.
Examples
The jack presses the movable wedge-shaped steel tenon after the pressure is stable and locks the movable wedge-shaped steel tenon, the exposure height S of the movable wedge-shaped steel tenon is measured, the wedge-shaped steel tenon driving-in ratio alpha is worked out through the formula (2), and whether the wedge-shaped steel tenon driving-in ratio alpha reaches the design value alpha or not is checked d 。
It is known that: s is 10cm, h is 30cm, then
Calculation of super-additive coefficient of jack oil pressure pre-applied value of steel support
Calculating the prestress loss and the super-adding coefficient of the steel pipe support based on a finite element model, selecting the super-adding coefficient by looking up a table 1 according to the prestress design value and the wedge-shaped steel tenon driving ratio design value, and requiring the jack oil pressure prestress value N 0 Not greater than the buckling bearing capacity N max And then apply a pre-force.
TABLE 1 super-additive factor theta of jack oil pressure pre-stressed value of steel support
And calculating to obtain a steel pipe supporting rigidity simulation value related to the driving ratio based on the finite element model. The values of the stiffness reduction coefficient of the steel support are shown in Table 2, and the values of the reduced stiffness can be obtained from the formula (3).
TABLE 2 reduction factor of steel bracing stiffness κ
Relation between steel pipe supporting bearing capacity and wedge-shaped steel tenon driving ratio
The bearing capacity of the steel pipe support is determined by the compression stability of the steel pipe and the bearing capacity of the steel pipe support adjacent plastic. The stability of the steel pipe is calculated according to the classification of the stress problem of the steel pipe according to the axial stress section component (the plate thickness t is less than 40mm) and the class b of the welding circular section according to the regulation of the design Standard of Steel Structure (GB50017-2017), and the calculation formula is regulated according to the 5.1.2
Wherein the content of the first and second substances,
the stability coefficient of an axial compression member is obtained by looking up a table according to the slenderness ratio of the member, the yield strength of steel and the classification of the section of the member.
According to the specification, calculate
Supporting steel:
D 1 ＝609mm，d 1 ＝577mm，l＝21m，E＝2.1×105N/mm 2
and (6) looking up a table to obtain:
calculating to obtain the steel pipe support temporary plastic bearing capacity N by establishing a steel pipe support finite element model p See table 3.
TABLE 3 Steel pipe support plastic-facing bearing capacity N of connecting steel tenon plastic-facing state p
Claims (9)
1. The steel pipe support erection construction process is characterized by comprising the following steps of:
step (1), determining the design index of the steel pipe support construction process, including the bearing capacity N of the steel pipe support a Design pre-stress value N d Wedge-shaped steel tenon driving ratio designValue alpha d And the depth h of the gap between the movable head and the steel pipe;
step (2), pre-stress value N is added according to design d And corresponding super-adding coefficient theta, determining the oil pressure pre-adding value N of the jack 0 Requiring a jack oil pressure preload value N 0 Not greater than the buckling bearing capacity N max Determining an oil pressure reading limit value according to the calibration relation between the load of the jack and the oil pressure;
step (3), a jack is used for opening the steel pipe and the adjustable head, when the oil pressure stable reading of the jack is not lower than the oil pressure reading limit value, the length of a connecting gap is generated between the adjustable head and the steel pipe, and the rectangular steel tenon, the fixed wedge-shaped steel tenon and the movable wedge-shaped steel tenon are filled;
step (4), driving in the movable wedge-shaped steel tenon, and locking the steel tenon;
step (5), measuring the exposure height of the movable wedge-shaped steel tenon, calculating the driving-in ratio alpha of the wedge-shaped steel tenon, and checking whether the driving-in ratio alpha of the wedge-shaped steel tenon is smaller than the design value alpha of the driving-in ratio of the wedge-shaped steel tenon d ；
Step (6), if the driving ratio alpha of the wedge-shaped steel tenon is smaller than the design value alpha of the driving ratio of the wedge-shaped steel tenon d If so, increasing the stable reading of the jack oil pressure to increase the length of a connecting gap between the adjustable head and the steel pipe, repeating the steps (4) to (6), and if not, entering the next step;
step (7), if the driving ratio alpha of the wedge-shaped steel tenon is not less than the design value alpha of the driving ratio of the wedge-shaped steel tenon d And the pressure of the jack is removed, and the steel pipe support erection is completed.
2. The steel pipe support erection construction process of claim 1, wherein the driving ratio α is:
in the formula: alpha is wedge-shaped steel tenon driving ratio; h is the depth of a cavity between the loose head and the steel pipe; h' is the complementary effective height of the wedge-shaped steel tenon; s is the exposure height of the movable wedge-shaped steel tenon, and the driving ratio alpha is between 0 and 1.
3. The steel pipe support erection construction process of claim 1, wherein the actual value of the axial compressive stiffness of the steel pipe support is determined by reducing the axial compressive stiffness of the steel pipe:
k′ R ＝κ·k R
in the formula: k is a reduction coefficient related to the dovetail driving ratio alpha; k is a radical of R The axial compressive rigidity of the steel pipe support is not considered when the wedge-shaped steel tenon driving ratio alpha is not considered; k' R In order to consider the axial compressive rigidity of the steel pipe support after the wedge-shaped steel tenon is driven into the steel pipe support with the driving ratio alpha.
4. The steel pipe support erection construction process of claim 1, wherein the jack oil pressure pre-stress value N0 and the effective pre-stress value N 1 The difference is the loss value of the axial force; effective pre-stress value N 1 Pre-load value N with jack oil pressure 0 The ratio is the preservation rate of axial force mu, mu is N 1 /N 0 。
5. The steel pipe supporting and erecting construction process according to claim 1, wherein the jack oil pressure pre-stress super-stress coefficient theta is as follows:
in the formula: mu-axial force retention.
6. The steel pipe support erection construction process of claim 1 or 4, wherein the jack oil pressure pre-stress value is as follows:
N 0 ≥N d θ。
7. the steel pipe support erection construction process of claim 1, wherein the wedge-shaped steel tenons are driven into the steel pipe with a design value α d Not less than 0.7.
8. The steel pipe support erection construction process of claim 1, wherein the steel pipe support has a buckling bearing capacity of N max And the temporary plastic bearing capacity N of the connecting steel tenon p Jointly determining:
N p ＝a·h·α·σ s -b
in the formula: n is a radical of a Supporting the bearing capacity of the steel pipe; n is a radical of max The bearing capacity of the compression and the bending is realized; n is a radical of p Is the plastic bearing capacity (kN); a is the section width of the connecting steel tenon; alpha is wedge-shaped steel tenon driving ratio; h is the height of the section of the connecting steel tenon; sigma s The yield strength of the connecting steel tenon material; and b is a corrected value of the bearing capacity in consideration of the plastic state of the connecting steel tenon.
9. The steel pipe support erection construction process of claim 1, wherein the design prestress value N is d Is not more than the temporary plastic bearing capacity N p 。
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| 张明聚等: "钢楔式活络端的工作原理与试验验证", 《施工技术》 * |
| 顾国明等: "深基坑钢支撑轴力实时补偿与监控系统设计", 《建筑机械化》 * |
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| CN114960667B (en) | 2023-03-31 |
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