CN110207872B - Foundation pit assembly type steel support axial force monitoring device and application method thereof - Google Patents
Foundation pit assembly type steel support axial force monitoring device and application method thereof Download PDFInfo
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- CN110207872B CN110207872B CN201910528289.7A CN201910528289A CN110207872B CN 110207872 B CN110207872 B CN 110207872B CN 201910528289 A CN201910528289 A CN 201910528289A CN 110207872 B CN110207872 B CN 110207872B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000012806 monitoring device Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000000246 remedial effect Effects 0.000 abstract description 2
- 230000000007 visual effect Effects 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a foundation pit assembly type steel support axial force monitoring device and a use method thereof, wherein the axial force monitoring device comprises an outer box, an inner box and an axial force meter which are spliced together; the use method of the steel support comprises the steps of stringing an outer box, an inner box and an axial force meter together with a cross arm through bolts, starting a pressurizing device to pressurize the cross arm, enabling the cross arm, the outer box and the inner box to generate gaps, inserting E-shaped steel sheets into the gaps until the gaps are filled, removing the pressurizing device, transmitting axial prestress to the axial force meter through the inner box and the bottom plate of the outer box, reading out the axial force of each axial force monitoring device through the axial force meter, and obtaining the sum of the axial forces of all the axial force monitoring devices, namely the axial force born by the steel support. The axial force monitoring device is simple in structure, convenient to install, accurate and visual in measurement result, provides monitoring data for the stability of the assembled steel support system, and can immediately find out when the support system is suddenly stressed in the process of excavating a foundation pit so as to take timely remedial measures.
Description
Technical Field
The invention relates to the technical field of foundation pit support, in particular to a foundation pit assembly type steel support axial force monitoring device and a use method thereof.
Background
Along with the development of deep foundation pit construction technology and the promotion of assembled building, foundation pit assembled steel supports are increasingly used, and have the advantages of light dead weight, high installation and dismantling speeds, capability of providing supporting function immediately after installation, environment friendliness, low manufacturing cost, short construction period and the like, thereby having very high popularization and application values.
The foundation pit assembled steel support has a plurality of advantages, but has certain disadvantages compared with a concrete support, namely the stability of the support system is not good, so that a certain measure is needed to be taken to compensate the problem of poor stability of the assembled steel support, the monitoring of the steel support is a main means, and the axial force of the assembled steel support is monitored immediately after the first-layer steel support is installed. The conventional axial force monitoring method adopts a vibrating wire type surface stress meter or a vibrating wire type steel plate meter, has the defects that axial force monitoring is carried out on the outer surface of the section steel, the accuracy is poor, the axial force monitoring method is generally only installed on one section steel of a group, and if the section steel of the group is eccentrically pressed, the deviation between the monitored axial force and the actual axial force is large.
Disclosure of Invention
The invention aims to provide a foundation pit assembled steel support axial force monitoring device and a use method thereof, which solve the problem that the conventional foundation pit assembled steel support axial force monitoring is monitored from the surface of profile steel and has poor accuracy.
In order to solve the technical problems, the invention adopts the following technical scheme:
a foundation pit assembly type steel support axial force monitoring device comprises an outer box, an inner box and an axial force meter which are spliced together; the outer box and the inner box are cuboid boxes with one opening formed by a bottom plate and four side plates, clamping grooves perpendicular to the bottom plate of the outer box are formed in the side plates of the outer box, rib plates perpendicular to the bottom plate of the inner box are arranged on the outer sides of the side plates of the inner box, limit plates which are on the same plane with the rib plates and perpendicular to the side plates of the inner box are arranged on the inner sides of the side plates of the inner box, the distance between the two symmetrical limit plates is larger than the diameter of the axial force meter, limit columns which extend towards the inner part of the outer box and are connected with the side plates of the outer box in an orthogonal mode are arranged at the bottoms of the clamping grooves of the outer box, and the distance between the two symmetrical limit columns is larger than the diameter of the axial force meter; the outer box side plates are respectively provided with a wire slot perpendicular to the bottom plate, the inner box side plates are respectively provided with a wire hole, and the outer box bottom plate and the inner box bottom plate are respectively provided with a bolt fixing hole.
In the invention, the distance between two symmetrical limiting plates is slightly larger than the diameter of the axial force meter, and the axial force meter can be placed between four limiting plates; the distance between the two symmetrical limiting columns is slightly larger than the diameter of the axial force meter, and the axial force meter can be clamped into the space between the four limiting columns.
Each rib plate of the inner box corresponds to the clamping groove of the outer box one by one and is matched with the outer box in size, and when the opening end of the inner box is opposite to the opening end of the outer box, the inner box can be inserted into the outer box, and each rib plate is inserted into the corresponding clamping groove respectively.
When the axial force meter is placed in the inner box, the axial force meter is positioned between each limiting plate and each limiting column.
The limiting plate and the rib plate are orthogonal to the side plate of the inner box, and the limiting plate and the rib plate are located on the same plane.
Preferably, the clamping groove is positioned in the middle of the outer box side plate, the middle edge of the outer box side plate extends to the outer box bottom plate, and the depth of the clamping groove is smaller than the height of the outer box side plate; the clamping groove penetrates through the inner side and the outer side of the outer box side plate.
The depth of the wire groove is smaller than that of the clamping groove, and the wire groove is preferably parallel to the clamping groove. The wire slot penetrates the inner side and the outer side of the side plate of the inner box.
The positions of the wire holes are in one-to-one correspondence with the positions of the wire grooves on the outer box, and the wire holes and the wire grooves are used for penetrating out the data wires of the axial force meter. When the inner box is inserted into the outer box, the data wire of the axial force meter can pass through the wire hole and the wire slot to pass out of the outer box.
The bolt fixing holes on the bottom plate of the outer box are preferably positioned at four corners of the bottom plate of the outer box.
The bolt fixing holes on the bottom plate of the inner box are preferably positioned at four corners of the bottom plate of the inner box.
The axial force meter is a cylindrical axial force monitor.
In the invention, the external dimension of the inner box is matched with the internal dimension of the outer box, namely, the distance between the inner walls of the two opposite side plates of the outer box is larger than the distance between the outer walls of the corresponding two side plates of the inner box, so that the inner box can be inserted into the outer box.
In the invention, after the inner box is inserted into the outer box, the clear distance between the bottom plate of the inner box and the bottom plate of the outer box is slightly smaller than the length of the axial force meter, so that gaps are reserved between the rib plates of the inner box and the bottom of the clamping groove of the outer box.
In the invention, the clamping groove of the outer box restrains the rib plate of the inner box, so that the dislocation or the eccentricity of the central axes of the inner box and the outer box is prevented.
In the invention, the outer box limit column and the inner box limit plate are used for restraining the axial force meter, so that the axial force meter is prevented from tilting, and the axial force monitoring is inaccurate.
The invention further provides a monitoring method of the foundation pit assembly type steel support axial force monitoring device, which specifically comprises the following steps: 1) Firstly, inserting one end of an axial force meter into an inner box, and then inserting the axial force meter and the inner box into an outer box together; 2) The outer box, the inner box and the axial force meter are connected with the bolt holes on the cross arm in series through the bolts on the outer box bottom plate and the inner box bottom plate, but not screwed, and the pressurizing device is arranged in the middle of the cross arm; 3) Starting a pressurizing device to pressurize the cross arm according to the design requirement, so that the pressurizing device applies prestress to the steel support system, the cross arm generates displacement along with the prestress, gaps are formed between the cross arm and the outer box bottom plate as well as between the cross arm and the inner box bottom plate, and E-shaped steel sheets with different thicknesses are inserted into the gaps until the gaps are filled; 4) Removing the pressurizing device, wherein axial prestress acts on the inner box bottom plate and the outer box bottom plate, the inner box bottom plate and the outer box bottom plate transmit force to the axial force meter, the axial force of each axial force monitoring device is read out through a data line of the axial force meter, and the sum of the axial forces of all the axial force monitoring devices is the axial force born by the steel support.
The foundation pit assembly type steel support axial force monitoring device can be used in place of a force-retaining box and can also be used together with the force-retaining box, and specifically comprises the following steps: two cross arms are added in a steel support system formed by combining a plurality of section steel, one or more axial force monitoring devices are arranged between the added two cross arms, and a force-keeping box is arranged between other cross arms for pressure monitoring. The foundation pit assembly type steel support axial force monitoring device in the method is the same as the first method.
The method has the advantages that the monitoring device can monitor the axial force condition of the whole pressurizing process in real time, and can monitor whether the pressure is lost or not after the pressurizing device is depressurized.
Compared with the prior art, the invention has the beneficial effects that: the invention can accurately monitor the axial force condition of the assembled steel support system, monitor the axial force change condition in the foundation pit excavation process in real time, and find and take corresponding measures in time to ensure the safety in the foundation pit excavation process if the axial force is greatly changed or exceeds an early warning value. By the accurate monitoring method, the defect that the stability of the assembled steel support supporting system is lower than that of the concrete support is overcome, and the popularization value and the application range of the assembled steel support are increased.
The axial force monitoring device disclosed by the invention is simple in structure, convenient to install, accurate and visual in measurement result, and capable of providing an accurate basis for stable monitoring of the assembled steel support system, and timely remedial measures can be taken if the support system is suddenly stressed in the foundation pit excavation process.
Drawings
FIG. 1 is a schematic diagram of the external case, the internal case and the axial force meter of the axial force monitoring device of the present invention after being disassembled.
FIG. 2 is a second schematic view of the device for monitoring axial force according to the present invention after the outer case, the inner case and the axial force meter are disassembled.
FIG. 3 is a schematic view of the axial force monitor of the present invention after the outer and inner boxes and the axial force meter are plugged.
FIG. 4 is a schematic view of the axial force monitoring device of the present invention placed in a cross arm without pressurization.
FIG. 5 is a schematic view of the axial force monitor apparatus of the present invention after being placed in a cross arm for pressurization.
FIG. 6 is a schematic view of the state of the monitoring device of the present invention after pressurization.
In the drawings, the reference numerals of the respective components are as follows:
1-outer box, 101-outer box side plate, 102-outer box bottom plate, 103-clamping groove, 104-limit column, 105-wire groove, 106-bolt fixing hole, 2-inner box, 201-inner box side plate, 202-inner box bottom plate, 203-rib plate, 204-limit plate, 205-wire hole, 206-bolt fixing hole, 3-axial force meter, 301-data wire, 4-steel support, 5-cross arm, 6-pressurizing device, 7-E type steel sheet, 8-axial force monitoring device and 9-bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings. It should be understood that the detailed description is presented by way of example only and is not intended to limit the invention.
The foundation pit assembly type steel support axial force monitoring device shown in fig. 1-2 comprises an outer box 1, an inner box 2 and an axial force meter 3;
the outer box 1 is a cuboid box with one surface being opened and composed of an outer box bottom plate 102 and four outer box side plates 101, clamping grooves 103 perpendicular to the outer box bottom plate 102 are formed in the outer box side plates 101, the clamping grooves 103 are located in the middle of the outer box side plates 101, and the depth of the clamping grooves 103 is smaller than the height of the outer box side plates 101; the bottom of each clamping groove 103 of the outer box 1 is provided with a limit column 104 which is orthogonally connected with the outer box side plate 101, the outer box side plate 101 is provided with a wire groove 105 which is perpendicular to the outer box bottom plate 102, the depth of the wire groove is smaller than that of the clamping groove 103, and the wire groove 105 is parallel to the clamping groove 103. Bolt fixing holes 106 are formed in four corners of the outer case bottom plate 102.
The inner box 2 is a cuboid box with one opening formed by an inner box bottom plate 202 and four inner box side plates 201, rib plates 203 perpendicular to the inner box bottom plate 202 are arranged on the outer sides of the inner box side plates 201, limiting plates 204 perpendicular to the inner box side plates 201 are arranged on the inner sides of the inner box side plates 201, the limiting plates and the rib plates 203 are perpendicular to the inner box side plates 201, and the limiting plates 204 and the rib plates 203 are in the same plane. The inner box side plates 201 are provided with wire holes 205, and the positions of the wire holes 205 are in one-to-one correspondence with the positions of the wire grooves on the outer box 1. Bolt fixing holes 206 are formed in four corners of the inner case bottom plate 202.
The axial force meter 3 is a cylindrical axial force monitor, and the axial force meter 3 is provided with a data line 301.
As shown in fig. 2, which is a schematic diagram of an external case 1, an internal case 2 and an axial force meter 3 of the axial force monitoring device after being inserted, the axial force meter 3 is arranged in the internal case 2, the distance between two symmetrical limiting plates 204 of the internal case 2 is larger than the diameter of the axial force meter 3, and the axial force meter 3 can be placed between the four limiting plates 204; the distance between the two symmetrical limiting columns 104 of the outer box 1 is larger than the diameter of the axial force meter 3, and the axial force meter 3 can be clamped into the four limiting columns 104. The external dimension of the inner box 2 is matched with the internal dimension of the outer box 1, the inner box 2 is inserted into the outer box 1 by the opening end and the opening end of the outer box 1 in a relative way, each rib 203 of the inner box 2 corresponds to the clamping groove 103 of the outer box 1 one by one in position, the dimensions are matched, and each rib 203 is inserted into each clamping groove 103 respectively; after the inner box 2 is inserted into the outer box 1, the clear distance between the inner box bottom plate 202 and the outer box bottom plate 102 is slightly smaller than the length of the axial force meter 3, so that a gap is reserved between the rib plate 203 of the inner box 2 and the bottom of the clamping groove 103 of the outer box 1. The data line of the axial force meter 3 passes out of the inner case 2 through the line hole 205 and protrudes through the line slot 105 of the outer case 1.
The following describes the method of using the axial force monitoring device 8 according to the present invention by using fig. 4 to 6, inserting the outer case 1, the inner case 2 and the axial force gauge 3, putting them in the middle of the cross arm 5, respectively using bolts 9 to string the bolt holes on the bottom plate 102 of the outer case and the bottom plate 202 of the inner case with the bolt holes on the two cross arms which are arranged oppositely, but not tightening them, putting two or more pressurizing devices 6 between the two cross arms 5, and fig. 4 is a state in which the pressurizing devices 6 are not pressurized. Starting the pressurizing device 6 to pressurize the two cross arms 5, so that the pressurizing device 6 applies prestress to the steel support 4, the cross arms 5 displace along with the prestress, gaps are formed between the cross arms 5 and the outer box bottom plate 102 and between the cross arms 5 and the inner box bottom plate 202, and E-shaped steel sheets 7 with different thicknesses are inserted into the gaps until the gaps are filled, as shown in fig. 5; after the pressurizing device 6 is depressurized, the pressurizing device 6 is dismantled, axial prestress acts on the inner box bottom plate 202 and the outer box bottom plate 102, the force is transmitted to the axial force meter 3 by the inner box bottom plate 202 and the outer box bottom plate 102, the axial force of each axial force monitoring device 8 is read out through a data line 301 of the axial force meter 3, and the sum of the axial forces of all the axial force monitoring devices 8 is the axial force born by the steel supports.
The present invention is capable of other and further embodiments and its several details are capable of modification and variation in accordance with the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The foundation pit assembly type steel support axial force monitoring device is characterized by comprising an outer box (1), an inner box (2) and an axial force meter (3) which are inserted together, wherein the outer box (1) and the inner box (2) are cuboid boxes with one opening formed by a bottom plate and four side plates, clamping grooves (103) perpendicular to the outer box bottom plate (102) are formed in the outer box side plates (101), rib plates (203) perpendicular to the inner box bottom plate (202) are arranged on the outer sides of the inner box side plates (201), limiting plates (204) which are in the same plane with the rib plates (203) and perpendicular to the inner box side plates (201) are arranged on the inner sides of the inner box side plates (201), and limiting columns (104) extending inwards of the outer box (1) and being connected with the outer box side plates (101) in an orthogonal mode are arranged at the bottoms of the clamping grooves (103) of the outer box (1); the outer box side plates (101) are respectively provided with a wire slot (105) perpendicular to the bottom plate, the inner box side plates (201) are respectively provided with a wire hole (205), and the outer box bottom plates (102) and the inner box bottom plates (202) are respectively provided with bolt fixing holes (106, 206); wherein:
four corners of the bottom plate (102) of the outer box are provided with bolt fixing holes (106);
bolt fixing holes (206) are formed in four corners of the bottom plate (202) of the inner box;
the axial force meter (3) is a cylindrical axial force monitor, and the axial force meter (3) is provided with a data line (301);
the data wire of the axial force meter (3) passes through the wire hole (205) to pass through the inner box (2) and extends out through the wire slot (105) of the outer box (1).
2. The foundation pit assembly type steel support axial force monitoring device according to claim 1, wherein the distance between two symmetrical limiting plates (204) is larger than the diameter of an axial force meter (3), and the axial force meter (3) can be placed between four limiting plates (204).
3. The foundation pit assembly type steel support axial force monitoring device according to claim 1, wherein the distance between two symmetrical limit posts (104) is larger than the diameter of an axial force meter (3), and the axial force meter (3) can be clamped between four limit posts (104).
4. The foundation pit assembled steel support axial force monitoring device according to claim 1, wherein each rib plate (203) of the inner box (2) corresponds to the clamping groove (103) of the outer box (1) one by one and is matched with the outer box (1) in size, when the opening end of the inner box (2) is opposite to the opening end of the outer box (1), the inner box (2) can be inserted into the outer box (1), and each rib plate (203) is respectively inserted into the corresponding clamping groove (103).
5. The foundation pit assembled steel support axial force monitoring device according to claim 1, wherein when the axial force gauge (3) is placed in the inner box (2), the axial force gauge (3) is located between each limiting plate (204) and the limiting column (104).
6. The foundation pit assembly type steel support axial force monitoring device according to claim 1, wherein the limiting plate (204) and the rib plate (203) are orthogonal to the inner box side plate (201), and the limiting plate (204) and the rib plate (203) are located on the same plane.
7. The foundation pit assembly type steel support axial force monitoring device according to claim 1, wherein the clamping groove (103) is located in the middle of the outer box side plate (101), the middle edge of the outer box side plate (101) extends towards the outer box bottom plate (102), the depth of the clamping groove (103) is smaller than the height of the outer box side plate (101), and the clamping groove (103) penetrates through the inner side and the outer side of the outer box side plate (101).
8. The foundation pit assembled steel support axial force monitoring device according to claim 7, wherein the depth of the wire groove (105) is smaller than that of the clamping groove (103), the wire groove (105) is parallel to the clamping groove (103), and the wire groove (105) penetrates through the inner side and the outer side of the inner box side plate (201).
9. A method for monitoring a foundation pit assembly type steel support axial force monitoring device according to one of claims 1 to 8, comprising the following steps: 1) firstly, one end of an axial force meter (3) is inserted into an inner box (2), and then the axial force meter (3) and the inner box (2) are inserted into an outer box (1) together; 2) The outer box (1), the inner box (2) and the axial force meter (3) are connected with bolt holes on the opposite cross arms (5) in series through bolt holes on the outer box bottom plate (102) and the inner box bottom plate (202) by bolts (9), but the pressurizing device (6) is installed between the two cross arms (5) without tightening; 3) Starting a pressurizing device (6) to pressurize the cross arm (5), so that the pressurizing device (6) applies prestress to the steel support system, the cross arm (5) generates displacement along with the prestress, gaps are generated between the cross arm (5) and the outer box bottom plate (102) and between the cross arm and the inner box bottom plate (202), and E-shaped steel sheets (7) with different thicknesses are inserted into the gaps until the gaps are filled; 4) Dismantling the pressurizing device (6), applying axial prestress on the inner box bottom plate (202) and the outer box bottom plate (102), transmitting force to the axial force meter (3) by the inner box bottom plate (202) and the outer box bottom plate (102), reading out the axial force of each axial force monitoring device through a data line (301) of the axial force meter (3), and obtaining the sum of the axial forces of all the axial force monitoring devices, namely the bearing axial force of the group of steel supports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910528289.7A CN110207872B (en) | 2019-06-18 | 2019-06-18 | Foundation pit assembly type steel support axial force monitoring device and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910528289.7A CN110207872B (en) | 2019-06-18 | 2019-06-18 | Foundation pit assembly type steel support axial force monitoring device and application method thereof |
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| CN110207872A CN110207872A (en) | 2019-09-06 |
| CN110207872B true CN110207872B (en) | 2024-03-26 |
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| CN201910528289.7A Active CN110207872B (en) | 2019-06-18 | 2019-06-18 | Foundation pit assembly type steel support axial force monitoring device and application method thereof |
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Families Citing this family (1)
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| CN111537118B (en) * | 2020-05-28 | 2022-05-13 | 浙江明思特建筑支护技术有限公司 | Multipurpose axial force detection system |
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| CN110207872A (en) | 2019-09-06 |
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