CN101463606A - Foundation pit controllable hydraulic steel support and use thereof - Google Patents
Foundation pit controllable hydraulic steel support and use thereof Download PDFInfo
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Abstract
The invention provides a controlled hydraulic steel support of a foundation pit and the application thereof, belonging to the field of construction engineering. The structure of the invention comprises a fixed end steel support, a flexible end steel support, a stopping device, an electric cabinet and a signal control cable; wherein, the fixed end steel support and the flexible end steel support are fixedly connected by a screw bolt as an integrated steel support, the stopping device is arranged between the fixed end steel support and a foundation pit enclosing purlin; wherein, the fixed end steel support is composed by a hydraulic oil cylinder, a spherical-hinge base, a seal cover, a route sensor, a connecting plate, a sealed oil tank, a supporting seat, a pressure sensor, an electric motor plus pump and a valve; the steel support device can compare the collected real-time information such as shaft force data, route change data and the like with support default value, the computer-controlled hydraulic system can realize the automatic adjustment and compensation of the support shaft force, and the support shaft force is adjusted according to the monitored results during construction to realize the requirements of controlling foundation pit deformation and guaranteeing safety during the foundation pit construction process. The controlled hydraulic steel support can be widely used for the pit protection during the foundation pit excavation process.
Description
Technical field:
The present invention relates to a kind of foundation ditch steel and support, particularly a kind of foundation ditch controllable hydraulic steel supports and the concrete application in foundation pit construction, belongs to building engineering field.
Background technology:
Prevent supporting way in the general employing of malformation in the foundation pit construction, the most frequently used supporting form is a steel support structure.Steel supports to be convenient to install and remove, and the consumption of material is little, can apply pretightning force with reasonable control foundation pit deformation, and the speed of setting up of steel support simultaneously is very fast, helps the reduction of erection time.This supporting form easy construction is widely used in the strip foundation ditch.The active head of the general employing of the joint that steel supports is with also plugging in gad behind the jack brace pre axial force.But the shortcoming of this support also is conspicuous in actual applications: promptly the gad that steel supports in construction tangible plastic strain can occur under the effect of axle power, placement along with foundation ditch, significantly decay will appear in the steel axial force of the supports, cause tangible steel supporting deformation.The time that this distortion is placed with foundation ditch increases and becomes big, the twice of distortion when the steel supporting deformation can reach the excavation end under the individual cases.Although the measure that is added with a power has been adopted in the job site, because excavation back secondary is added with a power construction a lot of difficulties are arranged, can not be from addressing this problem in essence.
Summary of the invention:
The present invention is directed to the deficiencies in the prior art, provide a kind of foundation ditch controllable hydraulic steel to support.This steel bracing or strutting arrangement can with the real time information such as axle force data, stroke delta data that collect with support set value and compare; and then realize that by computer-controlled hydraulic system axial force of the supports regulates compensation automatically; and can adjust axial force of the supports according to the monitoring result in when construction; to reach the control foundation pit deformation, guarantee foundation pit construction process safe requirement.
The present invention is achieved through the following technical solutions, foundation ditch controllable hydraulic steel supports and comprises: the support of fixed end steel, the support of movable end steel, stopping device, electric control box and signal controlling cable, wherein the movable end steel supports with the support of fixed end steel and is bolted to connection to steel props up support integral, and stopping device is arranged on the support of movable end steel and foundation ditch encloses between the purlin.
The movable end steel supports and is made of hydraulic jack, ball pivot seat, seal closure, stroke sensor, junction plate, closed tank, supporting seat, pressure sensor, motor+pump and valve group.Wherein the piston rod head of hydraulic jack and ball pivot seat form and are hinged; Be located in the stroke sensor in the piston rod of hydraulic jack, can measure the variation of oil cylinder stroke displacement; Hydraulic jack and junction plate form a fixed connection by bolt in the rear end of oil cylinder; Closed tank and junction plate form a fixed connection by bolt on the junction plate right side;
Parts such as motor+pump, valve group all are anchored on the end cap of closed tank with the screw type of attachment; After using hydraulicefficiency tubing to connect hydraulic jack, closed tank, motor+pump and valve group, promptly constitute complete hydraulic system; Have pressure sensor to be arranged in the valve group simultaneously, the difference that can detect the hydraulic jack oil pressure changes; With supporting seat be sleeved on closed tank outer, place the junction plate right-hand member, with seal closure be sleeved on hydraulic jack outer, place the junction plate left end; Supporting seat, junction plate and seal closure form a fixed connection by bolt; Be provided with the signal controlling cable simultaneously and connect stroke sensor, pressure sensor and electric control box.
Its method of operating is as follows:
1, in advance that the support of movable end steel is good by bolt and the support and connection of fixed end steel on the ground, guarantee that the hydraulic cylinder piston rod that the movable end steel supports is in the sufficient state that contracts, promptly constitute a complete foundation ditch steel after connection is finished and support.
2, when hydraulic cylinder piston rod is positioned at 1/2nd left and right sides of oil cylinder total kilometres, the length that guarantees whole support safeguards that with the foundation ditch both sides spacing of wall equates substantially, to guarantee that the controllable hydraulic steel is supported with certain construction space, loading in the convenient construction process and unloading.
3, the signal controlling cable is connected electric control box and respective sensor, and debug.
4, when excavation of foundation pit arrives pre-support position, the complete foundation ditch steel support that will install in advance and debug with crane hangs to welding bracket place.
5, find the installation site accurately, the fixed end steel is supported with foundation pit enclosure structure one gusset purlin fixing.
6, reference axis power setting value: supposition will have support same size with this hydraulic pressure steel steel pipe as a whole supporting role in foundation ditch, calculate the steel pipe axial force of the supports according to conventional steel pipe supported design principle in the base pit engineering, with it as axle power set value.
7, operation electric control box, pump is given the big chamber of hydraulic jack through the valve group for hydraulic oil, make the hydraulic cylinder piston rod elongation, the supporting seat that is fixed on the piston rod is acted on enclosing on the purlin of foundation pit enclosure structure opposite side, strengthen oil pressure, suitably adjust axial force of the supports, after reaching comparatively ideal control and safeguarding the setting value of foundation pit deformation, make the axle power that acts on this strong point reach set value,, make hydraulic system enter automatic compensation-packing state even support and foundation ditch inside wall soil pressure maintenance equilibrium state; This moment is in the support of movable end steel and enclose insertion installation stopping device between purlin.
Oil cylinder oil pressure value when 8, hydraulic system being entered automatic compensation-packing state is as set thrust oil pressure value, with this moment hydraulic cylinder piston rod stroke value as set stroke value, and corresponding bound safety value is set.
9, sending real-time oil cylinder stroke data message and pressure data information to electric control box by stroke sensor and pressure sensor handles.
The present invention can realize axle force compensating and bit shift compensation in the upper limit value and lower limit value safe range of setting.When axle power drops in limited time, system promptly controls electric motor starting and controls reversal valve action, and pumping source is given the big chamber of oil cylinder through the valve group for hydraulic oil, makes the oil pressure in the big chamber of oil cylinder be increased to the higher limit of setting, system promptly controls the motor shutdown and reversal valve is reset to meta, makes system reach the pressurize stable state; When changing, land movement is lower than when being definite value, can cause a power decay equally, system promptly controls electric motor starting and controls the reversal valve action, pumping source is given the big chamber of oil cylinder through the valve group for hydraulic oil, make the oil pressure in the big chamber of oil cylinder be increased to the higher limit of setting, carry out the displacement adjustment simultaneously, the corresponding increase of stroke sensor signal value meeting, system is reporting to the police in the displacement adjustment automatically automatically; When land movement changes when exceeding setting value, can cause a power to increase equally and exceed setting value, the pressurize that can automatic overflow resets to the safe range of the valve group of hydraulic system, simultaneity factor is reported to the police automatically.The staff can carry out analyzing and processing as the case may be immediately, has removed the complicated processes that the artificial secondary of traditional support is added with a power from.
In actual application, the controllable hydraulic steel supports the variation control that can implement a power and displacement, hydraulic pressure support observed pressure value and the theoretical set force value that distributes on vertical each degree of depth in the foundation ditch and horizontal each span points can be compared, report to the police when exceeding the threshold of theoretical equilibrium pressure value or unstability, reached the effect of control foundation ditch safe construction as the observed pressure value.
The present invention has outstanding substantive distinguishing features and obvious improvement, with respect to traditional support that has gad, the present invention can adjust the axle power of support at any time according to the monitoring result that sensor is beamed back when construction, can plastic strain not occur and cause tangible supporting deformation phenomenon, to reach the purpose of controlled deformation.Support than original foundation ditch, can improve automaticity and safety of construction greatly, and when saving manpower, realize the purpose of efficient construction.The disassembly sequence that the foundation ditch controllable hydraulic supports is contrary in assembly process, assembles and open and inspect all very convenient, can repeat long-term use, thereby can save engineering cost.Electric control box can be controlled many cover foundation ditch hydraulic pressure simultaneously and support long-term work, forms more complete foundation ditch hydraulic pressure and supports the visualized management system.
Description of drawings:
Fig. 1 is the structure principle chart that foundation ditch controlled hydraulic steel supports
Wherein: the support of 1-fixed end steel, the support of 2-movable end steel, 3-stopping device, 4-electric control box, 5-signal controlling cable, 6-enclose purlin, 7-foundation pit enclosure structure, 8-bracket, 21-hydraulic jack, 22-ball pivot seat, 23-seal closure, 24-junction plate, 25-closed tank, 26-supporting seat, 27-motor+pump, 28-valve group, 201-stroke sensor, 202-pressure sensor
The specific embodiment:
The existing specific embodiment of 1 this invention of explanation in conjunction with the accompanying drawings: the access base pit engineering at certain subway station, the excavation of foundation pit area is for for 1224.2m
2, cutting depth is below ground 10.75m, uses three road Φ 609 * 16mm steel pipes to support, wherein two row, three row of foundation ditch topmost altogether the six roots of sensation support and used the controllable hydraulic steel to support that (Φ 609 * 16mm).The support horizontal spacing is 4500mm, and longitudinal pitch is 3300mm, and first row supports and the ground interplanar distance is 1200mm.
Each foundation hole controllable hydraulic steel supports and comprises: fixed end steel support 1, movable end steel support 2, stopping device 3, electric control box 4 and signal controlling cable 5, wherein the support 2 of movable end steel is bolted to connection to steel props up support integral with fixed end steel support 1, and stopping device 3 is arranged on the support 2 of movable end steel and foundation ditch encloses between the purlin 6.
The movable end steel supports 2 and is made of hydraulic jack 21, ball pivot seat 22, seal closure 23, stroke sensor 201, junction plate 24, closed tank 25, supporting seat 26, pressure sensor 202, motor+pump 27 and valve group 28.Wherein the piston rod head of hydraulic jack 21 and ball pivot seat 22 form and are hinged; Be located in the stroke sensor 201 in the piston rod of hydraulic jack 21, can measure the variation of oil cylinder stroke displacement; Hydraulic jack 21 forms a fixed connection by bolt at the middle part of oil cylinder with junction plate 24; Closed tank 25 forms a fixed connection by bolt on the junction plate right side with junction plate 24; Parts such as motor+pump 27, valve group 28 all are anchored on the end cap of closed tank 25 with the screw type of attachment; After using hydraulicefficiency tubing to connect hydraulic jack 21, closed tank 25, motor+pump 27 and valve group 28, promptly constitute complete hydraulic system; Have pressure sensor 202 to be arranged in the valve group 28 simultaneously, the difference that can detect hydraulic jack 21 oil pressure changes; With supporting seat 26 be sleeved on closed tank 25 outer, place junction plate 24 right-hand members, with seal closure 23 be sleeved on hydraulic jack 21 outer, place junction plate 24 left ends; Supporting seat 26, junction plate 24 and seal closure 23 form a fixed connection by bolt; Be provided with signal controlling cable 5 simultaneously and connect stroke sensor 201, pressure sensor 202 and electric control box 4.
Its method of operating is as follows:
1, in advance the support 2 of movable end steel is supported 1 by bolt and fixed end steel on the ground and connect, guarantee that hydraulic jack 21 piston rods of movable end steel support 2 are in the sufficient state that contracts, promptly constitute a complete foundation ditch steel support after connection is finished.
2, when hydraulic jack 21 piston rods are positioned at 1/2nd left and right sides of oil cylinder total kilometres, the length that guarantees whole support safeguards that with the foundation ditch both sides spacing of wall equates substantially, to guarantee that the controllable hydraulic steel is supported with certain construction space, loading in the convenient construction process and unloading.
3, signal controlling cable 5 is connected electric control box 4 and respective sensor, and debug.
4, when excavation of foundation pit arrives pre-support position, the complete foundation ditch steel support that will install in advance and debug with crane hangs to welding bracket 8 places.
5, find the installation site accurately, the support 1 of fixed end steel is fixed with foundation pit enclosure structure one gusset purlin.
6, reference axis power setting value: supposition will have support same size with this hydraulic pressure steel steel pipe as a whole supporting role in foundation ditch, calculate the steel pipe axial force of the supports according to conventional steel pipe supported design principle in the base pit engineering, with it as axle power set value.
7, operation electric control box 4, pump is given the big chamber of hydraulic jack through valve group 28 for hydraulic oil, make the hydraulic cylinder piston rod elongation, the ball pivot seat 22 that is fixed on the piston rod is acted on enclosing on the purlin 6 of foundation pit enclosure structure 7 opposite sides, strengthen oil pressure, suitably adjust axial force of the supports, after reaching comparatively ideal control and safeguarding the setting value of foundation pit deformation, make the axle power that acts on this strong point reach set value, even support and foundation ditch inside wall soil pressure maintenance equilibrium state, make hydraulic system enter automatic compensation-packing state; This moment is in movable end steel support 2 and enclose 6 insertion installations of purlin stopping device 3.
Oil cylinder oil pressure value when 8, hydraulic system being entered automatic compensation-packing state is as set thrust oil pressure value, with this moment hydraulic cylinder piston rod stroke value as set stroke value, and corresponding bound safety value is set.
9, send real-time oil cylinder stroke data message and pressure data information to electric control box 4 by stroke sensor 201 with pressure sensor 202 and handle, and then compare with set stroke value and set thrust oil pressure value.
Set thrust oil pressure value is taken as 200bar, and its upper lower limit value is ± 15bar; Set stroke value is taken as 150mm, and its upper lower limit value is ± 5mm.
The present invention can realize axle force compensating and bit shift compensation in the upper limit value and lower limit value safe range of setting.When axle power drops in limited time, system promptly controls electric motor starting and controls reversal valve action, and pumping source is given the big chamber of oil cylinder through the valve group for hydraulic oil, makes the oil pressure in the big chamber of oil cylinder be increased to the higher limit of setting, system promptly controls the motor shutdown and reversal valve is reset to meta, makes system reach the pressurize stable state; When changing, land movement is lower than when being definite value, can cause a power decay equally, system promptly controls electric motor starting and controls the reversal valve action, pumping source is given the big chamber of oil cylinder through the valve group for hydraulic oil, make the oil pressure in the big chamber of oil cylinder be increased to the higher limit of setting, carry out the displacement adjustment simultaneously, the corresponding increase of stroke sensor signal value meeting, system is reporting to the police in the displacement adjustment automatically automatically; When land movement changes when exceeding setting value, can cause a power to increase equally and exceed setting value, the pressurize that can automatic overflow resets to the safe range of the valve group of hydraulic system, simultaneity factor is reported to the police automatically.The staff can carry out analyzing and processing as the case may be immediately, has removed the complicated processes that the artificial secondary of traditional support is added with a power from.
In actual application, the controllable hydraulic steel supports the variation control that can implement a power and displacement, hydraulic pressure support observed pressure value and the theoretical set force value that distributes on vertical each degree of depth in the foundation ditch and horizontal each span points can be compared, report to the police when exceeding the threshold of theoretical equilibrium pressure value or unstability, reached the effect of control foundation ditch safe construction as the observed pressure value.
Claims (3)
1. a foundation ditch controllable hydraulic steel supports, and it is characterized in that having comprised the support of fixed end steel, the support of movable end steel, stopping device, electric control box and signal controlling cable; Wherein the movable end steel supports with the support of fixed end steel and is bolted to connection to steel props up support integral, and stopping device is arranged on the support of movable end steel and foundation ditch encloses between the purlin; Wherein the movable end steel supports and is made of hydraulic jack, ball pivot seat, seal closure, stroke sensor, junction plate, closed tank, supporting seat, pressure sensor, motor+pump and valve group; The piston rod head of hydraulic jack and ball pivot seat form and are hinged; Be located in the stroke sensor in the piston rod of hydraulic jack, can measure the variation of oil cylinder stroke displacement; Hydraulic jack and junction plate form a fixed connection by bolt in the rear end of oil cylinder; Closed tank and junction plate form a fixed connection by bolt on the junction plate right side; Parts such as motor+pump, valve group all are anchored on the end cap of closed tank with the screw type of attachment; After using hydraulicefficiency tubing to connect hydraulic jack, closed tank, motor+pump and valve group, promptly constitute complete hydraulic system; Have pressure sensor to be arranged in the valve group simultaneously, the difference that can detect the hydraulic jack oil pressure changes; Supporting seat places the junction plate right-hand member, and is sleeved on outside the closed tank; Seal closure places the junction plate left end, and is sleeved on outside the hydraulic jack; Supporting seat, junction plate and seal closure form a fixed connection by bolt; Be provided with the signal controlling cable simultaneously and connect stroke sensor, pressure sensor and electric control box.
2. a foundation ditch controllable hydraulic steel is supported on the application process in the foundation pit construction, it is characterized in that construction method step is as follows:
1) in advance that the support of movable end steel is good by bolt and the support and connection of fixed end steel on the ground, guarantee that the hydraulic cylinder piston rod that the movable end steel supports is in the state of tightening up, promptly constitute a complete foundation ditch steel after connection is finished and support;
2) when hydraulic cylinder piston rod is positioned at 1/2nd left and right sides of oil cylinder total kilometres, the length that guarantees whole support safeguards that with the foundation ditch both sides spacing of wall equates substantially, to guarantee that the controllable hydraulic steel is supported with certain construction space, loading in the convenient construction process and unloading;
3) the signal controlling cable is connected electric control box and respective sensor, and debug;
4) when excavation of foundation pit arrives pre-support position, the complete foundation ditch steel support that will install in advance and debug with crane hangs to welding bracket place;
5) find the installation site accurately, the fixed end steel is supported with foundation pit enclosure structure one gusset purlin fixing;
6) reference axis power setting value: supposition will have support same size with this hydraulic pressure steel steel pipe as a whole supporting role in foundation ditch, calculate the steel pipe axial force of the supports according to conventional steel pipe supported design principle in the base pit engineering, with it as axle power set value;
7) operation electric control box, pump is given the big chamber of hydraulic jack through the valve group for hydraulic oil, make the hydraulic cylinder piston rod elongation, the supporting seat that is fixed on the piston rod is acted on enclosing on the purlin of foundation pit enclosure structure opposite side, strengthen oil pressure, suitably adjust axial force of the supports, after reaching comparatively ideal control and safeguarding the setting value of foundation pit deformation, make the axle power that acts on this strong point reach set value,, make hydraulic system enter automatic compensation-packing state even support and foundation ditch inside wall soil pressure maintenance equilibrium state; This moment is in the support of movable end steel and enclose insertion installation stopping device between purlin;
Oil cylinder oil pressure value when 8) hydraulic system being entered automatic compensation-packing state is as set thrust oil pressure value, with this moment hydraulic cylinder piston rod stroke value as set stroke value, and corresponding bound safety value is set;
9) send real-time oil cylinder stroke data message and pressure data information to electric control box by stroke sensor and pressure sensor and handle, and then compare with set stroke value and set thrust oil pressure value;
10) when dropping to, axle power prescribes a time limit, system promptly controls electric motor starting and controls the reversal valve action, pumping source is given the big chamber of oil cylinder through the valve group for hydraulic oil, make the oil pressure in the big chamber of oil cylinder be increased to the higher limit of setting, system promptly controls the motor shutdown and reversal valve is reset to meta, makes system reach the pressurize stable state; When changing, land movement is lower than when being definite value, can cause a power decay equally, system promptly controls electric motor starting and controls the reversal valve action, pumping source is given the big chamber of oil cylinder through the valve group for hydraulic oil, make the oil pressure in the big chamber of oil cylinder be increased to the higher limit of setting, carry out the displacement adjustment simultaneously, the corresponding increase of stroke sensor signal value meeting, system is reporting to the police in the displacement adjustment automatically automatically; When land movement changes when exceeding setting value, can cause a power to increase equally and exceed setting value, the pressurize that can automatic overflow resets to the safe range of the valve group of hydraulic system, simultaneity factor is reported to the police automatically.
3. foundation ditch controllable hydraulic steel according to claim 2 is supported on the application process in the foundation pit construction, it is characterized in that: the set thrust oil pressure value described in the job practices can be taken as 200bar, and its upper lower limit value is ± 15bar; Set stroke value can be taken as 150mm, and its upper lower limit value is ± 5mm.
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| CNA2007101725431A CN101463606A (en) | 2007-12-19 | 2007-12-19 | Foundation pit controllable hydraulic steel support and use thereof |
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| CNA2007101725431A CN101463606A (en) | 2007-12-19 | 2007-12-19 | Foundation pit controllable hydraulic steel support and use thereof |
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| CN117552435A (en) * | 2023-11-06 | 2024-02-13 | 中铁四局集团有限公司 | Pit lateral wall strengthens support and monitoring system in coastal pit |
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2007
- 2007-12-19 CN CNA2007101725431A patent/CN101463606A/en active Pending
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