CN115059088A - Foundation pit steel supporting device with adjustable distance and measurable force - Google Patents
Foundation pit steel supporting device with adjustable distance and measurable force Download PDFInfo
- Publication number
- CN115059088A CN115059088A CN202210664151.1A CN202210664151A CN115059088A CN 115059088 A CN115059088 A CN 115059088A CN 202210664151 A CN202210664151 A CN 202210664151A CN 115059088 A CN115059088 A CN 115059088A
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- wedge block
- block
- foundation pit
- screw rod
- force
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention relates to a foundation pit steel supporting device with adjustable distance and measurable force, which comprises an enclosure structure, a bracket, a top block, a wedge block, a base and a supporting movable joint, wherein the base is provided with a wedge block through hole which penetrates through the base up and down, the wedge block is inserted into the wedge block through hole, the top block is slidably arranged on a horizontal seat and is in close fit with the inclined surface of the wedge block, the supporting movable joint is fixedly arranged on one side of the top block, which is back to the wedge block, and is used for supporting the side wall of a foundation pit, a controller is arranged on the wedge block and is used for driving the wedge block to move up and down, so that the wedge block horizontally extrudes the top block through the inclined surface, and accordingly axial force is applied to the supporting movable joint, and a dynamometer is arranged at the controller and is used for detecting the reaction force of the wedge block on the controller. According to the invention, the steel support is flexibly supported and loosened by the supporting block by controlling the position of the wedge block embedded into the base, the axial force adjustment of the steel support is realized, and the internal axial force of the steel support can be measured by measuring the internal axial force of the tensioning device.
Description
Technical Field
The invention belongs to the technical field of foundation pit engineering, and particularly relates to a steel supporting device with adjustable distance and measurable force.
Background
The steel support system is widely applied to the design of the deep foundation pit due to the characteristics of small restriction and convenient construction. A traditional axial force steel support is characterized in that a flexible head is adopted, an iron wedge is driven into the jack to be clamped after an axial force is exerted through a manual jack, and then the jack is detached. In the excavation process of the foundation pit, the stability is poor under the influence of temperature and environmental changes. Monitoring data are collected manually at regular intervals, the force value is known, and then whether axial force adding is carried out or not is determined. When the axial force is insufficient, the jack needs to be installed again to perform axial force adding again and tighten the steel wedge for compensation, the compensation has hysteresis, and the support axial force cannot be guaranteed. During compensation, the displacement of the diaphragm wall cannot be controlled, and time and labor are consumed.
According to related researches, the deformation control effect of all the steel supports adopting the automatic servo system is the best, the steel supports are used at intervals, and the effect of a single certain use is the worst. The conventional servo system is expensive, and the construction cost is high due to the fact that the servo system is installed on each steel pipe support in the foundation pit engineering.
The conventional foundation pit inner support servo system axial force meter needs to be installed between the support end and the support structure, the sectional area is small, the support head is prone to compression deformation under high axial force, support eccentricity is prone to being caused in the installation process, and large risks exist.
Disclosure of Invention
The invention aims to solve the technical problem of providing a foundation pit steel supporting device with adjustable distance and measurable force aiming at the defects of the prior art.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a foundation pit steel supporting device with adjustable distance and measurable force comprises an enclosure structure, a bracket, a top block, a wedge block, a base and a supporting movable head, wherein the enclosure structure is fixed in a foundation pit, the bracket is fixed on the enclosure structure, the base is fixed on the bracket, the base is provided with a horizontal seat, the horizontal seat is provided with a wedge block through hole which penetrates up and down, the wedge block is inserted into the wedge block through hole, the top block is slidably arranged on the horizontal seat, and is closely matched with the inclined plane of the wedge block, one side of the top block back to the wedge block is fixedly provided with a supporting loose joint which is used for supporting the side wall of the foundation pit, a controller is arranged on the wedge block and is used for driving the wedge block to move up and down so that the wedge block extrudes the top block through the inclined plane to enable the top block to move horizontally, and axial force is applied to the supporting piston head, a dynamometer is installed at the controller, and the dynamometer is used for detecting the reaction force of the wedge block to the controller.
In order to optimize the technical scheme, the specific measures adopted further comprise:
the wedge block consists of a connecting plate, a left wedge block unit and a right wedge block unit, the upper ends of the wedge block units are wide, the lower ends of the wedge block units are narrow, the upper ends of the two wedge block units are connected through the connecting plate, and correspondingly, the number of the wedge block through holes is two and the two wedge block through holes correspond to the two wedge block units respectively.
The controller comprises a screw rod and a screw rod nut, a screw rod positioning hole is formed in the horizontal seat, the lower end of the screw rod penetrates through the screw rod positioning hole to be positioned, the screw rod vertically penetrates through the middle of the connecting plate, the screw rod nut is sleeved at the upper end of the screw rod, and the screw rod nut can press the wedge block downwards to enable the wedge block to move downwards when the screw rod moves downwards.
The dynamometer is installed between the lead screw nut and the connecting plate.
The top block is a solid component with a trapezoidal section, and a bolt hole is formed in the plane of one side of the top block and is used for being connected with a supporting loose head bolt; the inclined plane at the other side of the top block is bonded with the resistance reducing plate of the top block; the top block resistance reducing plate is tightly attached to the inclined surface of the wedge block.
The base is provided with a vertical baffle, the vertical baffle is located between the enclosure structure and the wedge block, the vertical baffle is provided with a drag reduction plate groove, the drag reduction plate groove is used for installing a wedge block drag reduction plate, and the wedge block drag reduction plate is tightly matched with the wedge block.
Stiffening baffles are arranged on two sides of the base and used for limiting the transverse displacement of the jacking block; the base is mounted on the bracket by adopting bolt connection.
The top block drag reduction plate and the wedge block drag reduction plate are made of weather-proof, corrosion-resistant and low-resistance MGB engineering plastic plates.
The base is provided with a vertical limiting stopper which is used for limiting and supporting the vertical displacement of the adjustable head.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention is different from the conventional servo system in that the adjustable block parts such as the top block, the wedge block and the base are arranged, and when the steel support needs to be adjusted, the position of the wedge block embedded into the base is controlled, so that the top block is flexibly pushed up and the steel support is loosened, and the axial force adjustment of the steel support is realized.
(2) The invention arranges the dynamometer at the tensioning device, which is different from the common servo system weakening the steel support compression surface. And the reliable stress of the steel support is ensured. The internal axial force of the steel support is indirectly measured by measuring the internal axial force of the tensioning device.
(3) The invention adopts a mechanical structure, has simple and reliable structure and lower manufacturing cost.
(4) The invention can be widely used in a deep foundation pit steel support system, and the tensioning device is provided with the electric control hydraulic tensioning system, so that the effective adjustment of the support rigidity of the foundation pit can be realized.
Drawings
FIG. 1 is a schematic three-dimensional structure of the present invention;
FIG. 2 is an assembled and disassembled view of the present invention;
FIG. 3 is a schematic view of the structure of the base;
FIG. 4 is a schematic view of the wedge construction;
FIG. 5 is a schematic structural view of a top block;
FIG. 6 is a schematic view of the vertical stop;
fig. 7 is a force analysis diagram between the wedge and the top block.
Wherein the reference numerals are: the device comprises a top block 1, a top block drag reduction plate 1-1, a wedge block 2, a controller 2-1, a dynamometer 2-2, a connecting plate 2-3, a wedge block unit 2-4, a base 3, a wedge block drag reduction plate 3-1, a drag reduction plate groove 3-2, a wedge block through hole 3-3, a screw rod positioning hole 3-4, a horizontal seat 3-5, a bracket 4, a surrounding structure 5, a supporting flexible head 6 and a vertical limiter 7.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1-6, the foundation pit steel supporting device with adjustable distance and measurable force of the embodiment includes an enclosure 5, a bracket 4, a top block 1, a wedge block 2, a base 3 and a supporting movable head 6, the enclosure 5 is fixed in the foundation pit, the base 3 is fixed on the bracket 4, the base 3 is provided with a horizontal seat 3-5, the bracket 4 is provided with a horizontal seat 3-5, the horizontal seat 3-5 is provided with a wedge block through hole 3-3 which penetrates up and down, the wedge block 2 is inserted into the wedge block through hole 3-3, the top block 1 is slidably arranged on the horizontal seat 3-5 and is tightly fitted with the inclined plane of the wedge block 2, the supporting movable head 6 is fixedly arranged on one side of the top block 1 opposite to the wedge block 2, the supporting movable head 6 is used for supporting the side wall of the foundation pit, the wedge block 2 is provided with a controller 2-1, the controller 2-1 is used for driving the wedge block 2 to move up and down, the wedge block 2 is enabled to horizontally move through the inclined plane extrusion jacking block 1, so that axial force is applied to the supporting piston head 6, a dynamometer 2-2 is installed at the controller 2-1, and the dynamometer 2-2 is used for detecting the reaction force of the wedge block 2 to the controller 2-1.
The wedge block 2 consists of a connecting plate 2-3 and a left wedge block unit 2-4 and a right wedge block unit 2-4, the upper end of each wedge block unit 2-4 is wide, the lower end of each wedge block unit is narrow, the upper ends of the two wedge block units 2-4 are connected through the connecting plate 2-3, and correspondingly, the number of the wedge block through holes 3-3 is two and corresponds to that of the two wedge block units 2-4 respectively. The wedge block through hole 3-3 can enable the wedge block 2 to pass through, and when the wedge block 2 is inserted downwards for a certain depth, the wedge block can be clamped, and the limit of the adjusting stroke is reached.
The steel support and the enclosure structure can be directly connected, or the steel support is connected to the purlin. If the steel support is directly connected with the enclosure structure, the bracket 4 is not arranged, an embedded part is embedded in the enclosure structure, and the base 3 is welded with the embedded part; if the steel support is connected with the surrounding purlin, the steel support and the surrounding purlin can be directly connected through bolts.
The controller 2-1 comprises a screw rod and a screw rod nut, a screw rod positioning hole 3-4 is formed in the horizontal seat 3-5, the lower end of the screw rod penetrates through the screw rod positioning hole to be positioned, the screw rod vertically penetrates through the middle of the connecting plate 2-3, the screw rod nut is sleeved at the upper end of the screw rod, and the screw rod nut can press the wedge block 2 downwards to enable the wedge block to move downwards when the screw rod moves downwards.
The dynamometer 2-2 is installed between the screw nut and the connecting plate 2-3.
The top block 1 is a solid component with a trapezoidal section, and a bolt hole is formed in the plane of one side of the top block and is used for being connected with the support piston head 6 through a bolt; the inclined plane on the other side of the top block 1 is bonded with the top block drag reduction plate 1-1; the top block resistance reducing plate 1-1 is tightly attached to the inclined plane of the wedge block 2.
The base 3 is provided with a vertical baffle plate, the vertical baffle plate is positioned between the enclosure structure 5 and the wedge block 2, the vertical baffle plate is provided with a drag reduction plate groove 3-2, the drag reduction plate groove 3-2 is used for installing the wedge block drag reduction plate 3-1, and the wedge block drag reduction plate 3-1 is closely matched with the wedge block 2.
Stiffening baffles are arranged at two sides of the base 3 and used for limiting the transverse displacement of the jacking block 1; the base 3 is mounted on the bracket 4 by means of a screw connection.
The top block drag reduction plate 1-1 and the wedge block drag reduction plate 3-1 are made of weather-proof, corrosion-resistant and low-resistance MGB engineering plastic plates.
The base 3 is provided with a vertical limiter 7, and the vertical limiter 7 is used for limiting and supporting the vertical displacement of the piston head 6.
When the invention is used, firstly, the bracket 4 is installed on the enclosure structure 5, and the base 3 and the bracket 4 are connected and fastened. A wedge-shaped drag reduction plate 3-1 is arranged in a drag reduction plate groove 3-2 on a base 3, and a controller 2-1 is connected with a screw rod positioning hole 3-4 on the bottom surface of the base 3. Secondly, assembling the steel support and the end head movable head 6 according to a common foundation pit engineering steel support construction method, further, bonding the top block resistance reducing plate 1-1 on the inclined surface of the top block 1, enabling the top block 1 and the movable head to form reliable connection, and hoisting the movable head and the connected top block into the base. Furthermore, the wedge block 2 is inserted into the wedge block through hole 3-3, and the position of the wedge block 2 is adjusted to be tightly attached to the top block 1 to bear force.
When the steel support in the foundation pit needs to pre-apply axial force, the wedge block 2 is moved downwards through the tension controller 2-1, and the jacking block 1 is forced to move along the axial direction of the steel support, so that the axial force is pre-applied.
The invention can be largely used in a deep foundation pit steel support system, the tensioning device is provided with an electric control hydraulic tensioning system and a tension monitoring system, through presetting a steel pipe axial force threshold value, when the axial force change of the steel pipe exceeds the threshold value, the system automatically monitors and alarms, and the tensioning controller adjusts the steel pipe axial force to ensure the support to be effective. Through installing displacement detection system and setting up the displacement threshold value to voussoir 2, and then realize axle power, displacement two accuse, make this device automatic regulation and control more reasonable.
The invention can optimize the internal force of the support system by adjusting the axial force of the steel support, so that the deformation and the stress of the enclosure structure are within the control value.
As shown in FIG. 7, the main force relationship of the present apparatus will be described with respect to the top block and the wedge. The force diagram is suitable for the stress state of the device in the adjusting process and the stress state after the adjustment is finished, and the main difference is that the former F μ Finger friction, the latter F μ Is static friction. When the component adjusts the wedge block, the top block is considered to be displaced only in the x direction, and F is ignored h And the moment created by F.
The axial force born by the device can be calculated by the following formula:
F＝(F t -F μ1 cosθ-F μ3 )·cotθ±F μ1 sinθ±F μ2 (2)
F μi ＝α i f·μ i (f＝F s ,F v ,F h ；i＝1,2,3) (3)
as can be seen from the formula (1), the steel pipe support axial force can be indirectly measured by the formula (2) through measuring the tensile force in the bolt. It should be noted that the magnitude of the friction force is related to the pressure, the friction coefficient, the working condition, etc., so that α is introduced into the formula (3) i And (6) correcting. F μ1 、F μ2 The direction is related to the working condition of the device, so that the device adopts the above expression,
wherein theta is the included angle between the inclined surface and the vertical surface of the wedge block 2, and F t For the force between the controller 2-1 and the wedge 2, F s Is the normal acting force between the inclined surface of the wedge block 2 and the top block 1, F μ1 Is the friction between the inclined surface of the wedge block 2 and the top block 1, F is the acting force between the top block 1 and the supporting movable head 6, F μ3 Is the friction force between the wedge drag reduction plate 3-1 and the wedge 2, F μ2 Is the friction between the top block 1 and the base 3, alpha i To correct the coefficient, F μi Representing the dominant part of the frictional force between the members, i.e. F μ1 、F μ2 、F μ3 The corresponding F represents the pressure F between the inclined surface of the wedge 2 and the top block 1 respectively s Pressure F between the top block 1 and the base 3 v Pressure F between the wedge drag reduction plate 3-1 and the wedge 2 h I.e. F ═ F s ,F v ,F h . Since the drag reduction materials can be selected differently, mu i To correspond to a different coefficient of friction at f, i.e. mu i ＝μ 1 ,μ 2 ,μ 3 . Obviously, the corresponding correction coefficients may also be different, so α i ＝α 1 ,α 2 ,α 3 . In summary, in equation (3), since the indices are combined, i is 1,2, and 3.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (9)
1. A foundation pit steel supporting device with adjustable distance and measurable force is characterized by comprising an enclosure structure (5), a bracket (4), a top block (1), a wedge block (2), a base (3) and a supporting movable head (6), wherein the enclosure structure (5) is fixed in a foundation pit, the bracket (4) is fixed on the enclosure structure (5), the base (3) is fixed on the bracket (4), the base (3) is provided with a horizontal seat (3-5), the horizontal seat (3-5) is provided with a wedge block through hole (3-3) which penetrates through from top to bottom, the wedge block (2) is inserted into the wedge block through hole (3-3), the top block (1) is slidably arranged on the horizontal seat (3-5) and is in close fit with an inclined plane of the wedge block (2), the supporting movable head (6) is fixedly arranged on one side of the top block (1) opposite to the wedge block (2), support head (6) of living in be used for supporting the foundation ditch lateral wall, voussoir (2) on install controller (2-1), controller (2-1) be used for driving voussoir (2) and reciprocate, make voussoir (2) extrude kicking block (1) through the inclined plane to make kicking block (1) translation, exert axial force to supporting head (6) of living in, controller (2-1) department install dynamometer (2-2), dynamometer (2-2) be used for detecting the reaction force of voussoir (2) to controller (2-1).
2. The foundation pit steel supporting device with the adjustable distance and the measurable force of claim 1, characterized in that the wedge block (2) is composed of a connecting plate (2-3) and a left wedge block unit and a right wedge block unit (2-4), the upper end of the wedge block unit (2-4) is wide, the lower end of the wedge block unit is narrow, the upper ends of the two wedge block units (2-4) are connected through the connecting plate (2-3), correspondingly, the number of the wedge block through holes (3-3) is two, and the two wedge block through holes correspond to the two wedge block units (2-4) respectively.
3. The foundation pit steel supporting device with adjustable distance and force measurement according to claim 2, wherein the controller (2-1) comprises a screw rod and a screw rod nut, the horizontal seat (3-5) is provided with a screw rod positioning hole (3-4), the lower end of the screw rod penetrates through the screw rod positioning hole for positioning, the screw rod vertically penetrates through the middle of the connecting plate (2-3), the screw rod nut is sleeved at the upper end of the screw rod, and the screw rod nut can press the wedge block (2) downwards to enable the wedge block to move downwards when the screw rod moves downwards.
4. A force-adjustable foundation pit steel supporting device according to claim 3, characterized in that the force gauge (2-2) is installed between the screw nut and the connecting plate (2-3).
5. The foundation pit steel supporting device with the adjustable distance and the measurable force as claimed in claim 4, wherein the top block (1) is a solid member with a trapezoidal section, and a bolt hole is formed in the plane of one side of the top block (1) and is used for being connected with the supporting swivel head (6) through a bolt; the inclined plane at the other side of the top block (1) is bonded with the top block drag reduction plate (1-1); the top block drag reduction plate (1-1) is tightly attached to the inclined plane of the wedge block (2).
6. The foundation pit steel supporting device with the adjustable distance and the measurable force according to claim 5, characterized in that the base (3) is provided with a vertical baffle plate, the vertical baffle plate is located between the enclosure structure (5) and the wedge block (2), the vertical baffle plate is provided with a drag reduction plate groove (3-2), the drag reduction plate groove (3-2) is used for installing the wedge block drag reduction plate (3-1), and the wedge block drag reduction plate (3-1) is closely matched with the wedge block (2).
7. The foundation pit steel supporting device with adjustable distance and measurable force of claim 6, characterized in that stiffening baffles are arranged on both sides of the base (3) to limit the lateral displacement of the top block (1); the base (3) is installed on the bracket (4) by adopting bolt connection.
8. The foundation pit steel supporting device with adjustable distance and measurable force of claim 7, wherein the top block drag reduction plate (1-1) and the wedge block drag reduction plate (3-1) are made of MGB engineering plastic plate with weather resistance, corrosion resistance and low resistance.
9. The foundation pit steel supporting device with the adjustable distance and the measurable force according to claim 8, characterized in that a vertical stopper (7) is installed on the base (3), and the vertical stopper (7) is used for limiting the vertical displacement of the supporting swivel head (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210664151.1A CN115059088A (en) | 2022-06-14 | 2022-06-14 | Foundation pit steel supporting device with adjustable distance and measurable force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210664151.1A CN115059088A (en) | 2022-06-14 | 2022-06-14 | Foundation pit steel supporting device with adjustable distance and measurable force |
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| CN115059088A true CN115059088A (en) | 2022-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210664151.1A Pending CN115059088A (en) | 2022-06-14 | 2022-06-14 | Foundation pit steel supporting device with adjustable distance and measurable force |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116240984A (en) * | 2023-05-11 | 2023-06-09 | 中国二十二冶集团有限公司 | Built-in fitting connection structure for curtain wall |
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| CN208379598U (en) * | 2018-04-13 | 2019-01-15 | 上海公路桥梁（集团）有限公司 | Gad block fixes device |
| CN112012223A (en) * | 2020-08-27 | 2020-12-01 | 深圳市交通公用设施建设中心 | Support stable strutting arrangement for foundation ditch construction |
| CN113718640A (en) * | 2021-08-31 | 2021-11-30 | 南京工大桥隧与轨道交通研究院有限公司 | Displacement-adjustable cushion block device and application method thereof |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH03119041U (en) * | 1990-03-13 | 1991-12-09 | ||
| CN204803896U (en) * | 2015-07-08 | 2015-11-25 | 中建筑港集团有限公司 | Adjusting device that deep basal pit steel shotcrete prestressing force was applyed |
| CN205296174U (en) * | 2015-11-27 | 2016-06-08 | 武汉市汉阳市政建设集团公司 | Steel shotcrete head that looses |
| CN108360533A (en) * | 2018-04-13 | 2018-08-03 | 上海公路桥梁（集团）有限公司 | Gad block fixing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116240984A (en) * | 2023-05-11 | 2023-06-09 | 中国二十二冶集团有限公司 | Built-in fitting connection structure for curtain wall |
| CN116240984B (en) * | 2023-05-11 | 2023-08-18 | 中国二十二冶集团有限公司 | Built-in fitting connection structure for curtain wall |
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