CN117071596B - Small-sized well pit recyclable supporting structure and construction method thereof - Google Patents
Small-sized well pit recyclable supporting structure and construction method thereof Download PDFInfo
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- CN117071596B CN117071596B CN202311078878.2A CN202311078878A CN117071596B CN 117071596 B CN117071596 B CN 117071596B CN 202311078878 A CN202311078878 A CN 202311078878A CN 117071596 B CN117071596 B CN 117071596B
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 40
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 78
- 239000010959 steel Substances 0.000 claims abstract description 78
- 239000002689 soil Substances 0.000 claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 230000008602 contraction Effects 0.000 claims 1
- 210000004712 air sac Anatomy 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/08—Locking forms; Edge joints; Pile crossings; Branch pieces
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/14—Sealing joints between adjacent sheet piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a small-sized pit recoverable support structure, which comprises steel sheet piles, horizontal support rings, anchor rods with negative poisson ratio and air sac type steel pipe soil nails; the steel sheet pile forms a cavity in the inner periphery of the foundation pit through a self-locking structure, a plurality of horizontal support rings are arranged on the inner wall of the steel sheet pile in parallel, and a foundation pit early warning device is arranged on each horizontal support ring; the anchor rod with negative poisson ratio is connected with the steel sheet pile and inserted into the soil body; the bottom of the cavity is provided with an air sac type steel pipe soil nail; a water-swelling rubber strip is arranged at the joint of the steel sheet piles; the horizontal support ring comprises a plurality of first support rods with a telescopic function, the first support rods are connected with each other through an I-shaped seat and a second support rod, and the I-shaped seat is connected with the steel sheet pile through a self-locking structure. The invention has good supporting effect, convenient construction, convenient dismantling and recycling and can effectively perform foundation pit early warning; the horizontal support ring is connected through the bolts, welding is not needed, the structure is simple, maintenance of concrete is omitted, and support can be quickly carried out.
Description
Technical Field
The invention belongs to a supporting structure and a construction method thereof, in particular to a small-sized well pit recyclable supporting structure and a construction method thereof.
Background
Along with the wider and wider utilization of underground space, traffic modes also start to walk into the ground, and a series of small foundation pits with small foundation pit sizes, such as a pit, a tunnel outlet well head, a shield tunneling machine receiving well and the like, appear. The supporting structure system commonly used in normal use for the small foundation pits has the following effects: the construction period of the internal support system made of concrete is long, and after the engineering is finished, the internal support can pollute the environment when being dismantled; the use of the steel structure inner support supporting system shortens the construction period, has high material recycling rate, but needs a large amount of steel plate welding, wastes time and labor, and when the shield machine needs to be received, a part of horizontal support needs to be conveniently removed and reinforced to ensure the stability of the supporting structure, and the structure of the shield machine needs to save necessary working space. The diversity of foundation pits requires supporting structures to meet foundation pits of different sizes. The stability of the whole foundation pit is guaranteed in soft soil areas, so that the whole foundation pit cannot incline, pit bottom bulges and the like. Meanwhile, as the detection of the foundation pit is realized by importing collected data into a computer for checking, measures cannot be taken in time, and measures are taken immediately when the foundation pit begins to have collapse danger.
In general, the stability of the existing supporting system supporting structure needs to be further improved, the environment is polluted during dismantling, time and labor are wasted, real-time monitoring cannot be achieved, and measures are taken immediately after the foundation pit collapses.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention aims to provide a small-sized pit recyclable support structure, and another aim of the invention is to provide a construction method of the small-sized pit recyclable support structure.
The technical scheme is as follows: the invention relates to a small-sized pit recoverable support structure which comprises steel sheet piles, horizontal support rings, anchor rods with negative poisson ratio and air sac type steel pipe soil nails; the steel sheet pile forms a cavity in the inner periphery of the foundation pit through a self-locking structure, a plurality of horizontal support rings are arranged on the inner wall of the steel sheet pile in parallel, and a foundation pit early warning device is arranged on each horizontal support ring; the anchor rod with negative poisson ratio is connected with the steel sheet pile and inserted into the soil body; the bottom of the cavity is provided with an air sac type steel pipe soil nail; a water-swelling rubber strip is arranged at the joint of the steel sheet piles; the horizontal support ring comprises a plurality of first support rods with a telescopic function, the first support rods are connected with each other through an I-shaped seat and a second support rod, and the I-shaped seat is connected with the steel sheet pile through a self-locking structure.
Further, the first supporting rod comprises a first left threaded rod, a first right threaded rod and a first threaded cylinder which are coaxial, and the first threaded cylinder is arranged between the first left threaded rod and the first right threaded rod; the middle part of the first thread cylinder is a solid part, and the end part of the first thread cylinder is provided with a cavity for the expansion of the first left threaded rod and the first right threaded rod; the solid part is provided with a plurality of jacks for installing the foundation pit early warning device along the periphery of the solid part at uniform intervals.
Further, the first left threaded rod is connected with the adjacent first right threaded rod through the bending part and the second supporting rod. The first left threaded rod, the first right threaded rod and the second supporting rod form a triangular structure.
Further, the second supporting rod comprises a second left threaded rod, a second right threaded rod and a second threaded cylinder which are coaxial, and a second threaded cylinder is arranged between the second left threaded rod and the second right threaded rod; the middle part of the second thread cylinder is a solid part, and the end part is provided with a cavity for the second left threaded rod and the second right threaded rod to stretch out and draw back.
Further, the I-shaped seats are connected with each other along the direction perpendicular to the horizontal supporting ring through a third supporting rod with a telescopic function, and the structure of the third supporting rod is the same as that of the first supporting rod. The two third support rods and the upper and lower I-shaped seats can form a quadrangle in a plane so as to ensure that equipment such as a shield machine and the like which drills into soil can safely enter and exit.
Further, the anchor rod with the negative poisson ratio comprises an anchor head, an anchor rod body, rubber, a base plate and a nut, wherein the anchor rod with the negative poisson ratio is connected with the steel sheet pile through the base plate and the nut, the anchor head is connected with the anchor rod body through a T-shaped opening, and the rubber with a rough surface is arranged on the outer surface of the anchor rod body. The anchor rod body is made of microcosmic NPR steel and has the property of anti-Poisson's ratio.
Further, the air bag type steel pipe soil nail comprises an air bag, an anchor head and sealing rubber, one end of the air bag is connected with the sealing rubber, the other end of the air bag is connected with the anchor head, and the sealing rubber is used for inflating and fastening the air bag. Rubber is bound on the anchor rod body through a rope, the rubber is extruded when the anchor rod body is stretched and expanded, the sliding friction force is increased, and the supporting force is also increased.
Further, the self-locking structure comprises a lock catch, a spring, a handle, a connecting plate, a support and a transmission rod, wherein the lock catch is fixedly clamped with the I-shaped seat, the spring is nested on the lock catch, one end of the spring is fixedly connected with the connecting plate, and the other end of the spring is fixedly connected with the transmission rod; the handle is hinged with the transmission rod, the support is fixedly connected with the steel sheet pile, and the handle can drive the transmission rod to slide into the groove on the surface of the connecting plate.
Further, the foundation pit early warning device comprises a power supply, a switch, a strain gauge, an induced voltage alarm and a variable resistor, wherein the variable resistor is connected with the power supply and the switch in series, and the strain gauge and the induced voltage alarm are connected with the variable resistor in parallel. When the strain of the first thread cylinder is increased, the resistance value of the strain gauge is increased, then the obtained voltage on the strain gauge circuit is increased, and an alarm is given when the voltage reaches the voltage value of the induced voltage alarm.
Further, the surface of the steel sheet pile is painted first, and then the surface is painted with a lubricant.
The invention relates to a construction method of a small-sized pit recyclable support structure, which comprises the following steps:
Firstly, inserting rubber strips and steel sheet piles, wherein the rubber strips start to expand after contacting water, and gaps between the steel sheet piles are filled;
Step two, excavating a foundation pit, placing a horizontal supporting ring, inserting a self-locking structure into an I-shaped seat and self-locking the self-locking structure on a steel sheet pile, installing an early warning device on a first supporting rod, connecting the first supporting rod with the I-shaped seat, radially inserting a second supporting rod into the corresponding first supporting rod, and connecting the second supporting rod to the first supporting rod;
Driving a negative poisson ratio anchor rod obliquely along the foundation pit, and vertically driving air bag type steel pipe soil nails at the bottom of the foundation pit;
And fourthly, after the construction is finished, extruding the anchor rod with negative poisson ratio to enable the anchor rod to shrink, recovering a rod piece, discharging gas of the air bag type steel pipe soil nails, recovering the steel pipe soil nails, opening the self-locking structure to recover the horizontal support ring, and dismantling the steel sheet pile.
Working principle: the method comprises the steps of driving steel sheet piles before excavation of the foundation pit, preventing water from entering the foundation pit by using water-swelling rubber, and supporting the foundation pit in real time by using a horizontal supporting ring and the steel sheet piles when the foundation pit is excavated, and detecting whether the horizontal supporting ring is damaged or not by using an early warning device. The self-locking structure is utilized to fix the I-shaped seat on the steel sheet pile, and the steel sheet pile, the horizontal support ring, the anchor rod and the soil nail support structure are utilized to keep the stability of the foundation pit without damage and inclination.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable characteristics:
1. The support effect is good, the construction is convenient, the demolition and the recovery are convenient, and the foundation pit early warning can be effectively carried out;
2. the horizontal support rings are connected through bolts, welding is not needed, the structure is simple, construction operation is convenient and fast, and maintenance of concrete is omitted, so that an excavated part can be quickly supported in the construction process;
3. Because the construction space of the small foundation pit is smaller, the horizontal support ring is supported, the horizontal support ring hardly occupies the space of the inner cavity of the support wall, and a larger construction space is provided for the working area in the foundation pit;
4. the air bag type anchor rod, the air bag type soil nails and the horizontal support ring are used, so that the support ring, the anchor rod and the soil nails can be recycled, the recycling efficiency is high, and the water-swelling rubber strip is used as a steel sheet pile waterproof material, so that the environment is protected and low in carbon;
5. due to the arrangement of the first support rod structure, the length or the number of the first support rods can be adjusted and increased according to the diameter of the foundation pit, so that the diameter of the horizontal support ring can be changed, the horizontal support ring is applicable to foundation pits with different diameters, and the support structure can support foundation pits with different diameters;
6. the negative poisson ratio anchor rods are driven into the periphery of the foundation pit and the air bag type steel pipe soil nails are driven into the bottom of the foundation pit, so that the negative poisson ratio anchor rods provide more anchoring force when the anchor rods are pulled, and the stability of the foundation pit is well ensured;
7. by vertically placing the first support rod, a clamping hole which is convenient for the shield machine to enter and exit can be constructed, so that construction equipment can enter and exit soil bodies conveniently;
8. When the strain of the horizontal support ring reaches the limit value, the foundation pit early warning device can give an alarm, and foundation pit constructors can take measures on site to maintain.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a top view of embodiment 1 of the present invention;
Fig. 3 is a schematic diagram showing the connection of steel sheet piles 1 according to example 1 of the present invention;
Fig. 4 is a schematic structural view of a first horizontal support ring 2 according to embodiment 1 of the present invention;
Fig. 5 is a schematic structural view of a negative poisson's ratio anchor 3 according to embodiment 1 of the present invention;
FIG. 6 is a schematic illustration of the attachment of anchor head 31 according to embodiment 1 of the present invention;
FIG. 7 is a schematic view of an air bag type steel pipe soil nail 4 according to example 1 of the present invention;
FIG. 8 is a schematic view of a self-locking structure 5 according to embodiment 1 of the present invention;
FIG. 9 is a side view of self-locking structure 5 of embodiment 1 of the present invention;
FIG. 10 is a schematic diagram showing the connection of the transmission rod 56 in the embodiment 1 of the present invention;
Fig. 11 is a circuit diagram of a pit warning device 7 according to embodiment 1 of the present invention;
Fig. 12 is a schematic structural view of embodiment 2 of the present invention;
Fig. 13 is a schematic structural view of the horizontal support ring 2 according to embodiment 3 of the present invention.
Detailed Description
Example 1
As shown in fig. 1-3, a steel sheet pile 1 of a small pit recoverable supporting structure is vertically driven into soil, a hexagonal prism-shaped cavity is formed in the inner periphery of a foundation pit through a self-locking structure 5, and a plurality of groups of hexagonal horizontal supporting rings 2 are arranged on the inner wall of the steel sheet pile 1 in parallel. The surface of the steel sheet pile 1 is coated with an anti-rust paint and a lubricant in sequence. The horizontal support ring 2 is provided with a foundation pit early warning device 7. The anchor rod 3 with negative poisson ratio is connected with the steel sheet pile 1 and is driven into soil obliquely. The bottom of the hexagonal prism-shaped cavity is vertically provided with an air bag type steel pipe soil nail 4. The joint of the steel sheet pile 1 and the steel sheet pile 1 is provided with a water-swelling rubber strip 6.
As shown in fig. 4, the horizontal support ring 2 comprises a plurality of first support rods 21 with telescopic functions, the adjacent first support rods 21 are hinged through an i-shaped seat 22, and the i-shaped seat 22 is fixed with the steel sheet pile 1 through a self-locking structure 5. The first support bar 21 includes a first left threaded rod 211, a first right threaded rod 212 and a first threaded cylinder 213, the first left threaded rod 211 and the first right threaded rod 212 are coaxially arranged at intervals, and the first threaded cylinder 213 coaxial therewith is connected between the first left threaded rod 211 and the first right threaded rod 212. The middle part of the first thread cylinder 213 is a solid part, and the end parts are provided with cavities for the first left threaded rod 211 and the first right threaded rod 212 to stretch and retract. The solid part is uniformly provided with a plurality of jacks 2131 for mounting the foundation pit early warning device 7 at intervals along the periphery thereof.
As shown in fig. 5-6, the anchor rod 3 with negative poisson ratio comprises an anchor head 31, an anchor rod body 32, rubber 33, a backing plate 34 and a nut 35, the anchor rod 3 with negative poisson ratio is connected with the steel sheet pile 1 through the backing plate 34 and the nut 35, the anchor head 31 is connected with the anchor rod body 32 through a T-shaped opening 311, the rubber 33 with elasticity and rough surface is arranged in the hollow part between the anchor rod body 32 and a sleeve, the rubber 33 is bound on the anchor rod body 32 through a rope, when the anchor rod body 32 is stretched and expanded, the rubber 33 is extruded, the sliding friction force is increased, and the supporting force is also larger. The anchor rod body 32 is made of microscopic NPR steel and has anti-Poisson ratio properties.
As shown in fig. 7, the balloon type steel pipe soil nail 4 comprises a balloon 41, an anchor head 42 and sealing rubber 43. The air bag 41 is made of a flexible material with good compression resistance in a closed manner, and the sealing rubber 43 is made of a material with excellent wear resistance, high strength and good thermal aging resistance. The tail of the air bag 41 is connected with the sealing rubber 43, the head is connected with the anchor head 42 and is sealed, the air bag 41 can be inflated at the sealing rubber 43, and finally the air bag 41 is fastened through the sealing rubber 43.
As shown in fig. 8-10, the self-locking structure 5 includes a lock catch 51, a spring 52, a handle 53, a connecting plate 54, a support 55 and a transmission rod 56, the transmission rod 56 is composed of a first transmission rod 561, a second transmission rod 562 and a connecting rod 563, and the first transmission rod 561 and the second transmission rod 562 are fixedly connected to form an i-shaped rod through the connecting rod 563. The lock catch 51 is clamped and fixed with the I-shaped seat 22, and the spring 52 is nested on the lock catch 51 and connected with the second transmission rod 562 and the connecting plate 54. One end of the spring 52 is fixedly connected with the lock catch 51, and the other end is fixedly connected with the second transmission rod 562. The handle 53 is hinged with the connecting rod 563, the support 55 is fixedly connected with the steel sheet pile 1, the handle 53 is pulled down rightwards, the first transmission rod 561 and the second transmission rod 562 can be driven to slide into the groove on the surface of the connecting plate 54, and the second transmission rod 562 drives the spring 52, so that the spring 52 is stressed to extend and lock the self-locking structure 5.
Referring to fig. 11, the pit warning device 7 includes a power source 71, a switch 72, a strain gauge 73, an induced voltage alarm 74, and a variable resistor 75, wherein the variable resistor 75 is connected in series with the power source 71 and the switch 72, and the strain gauge 73 and the induced voltage alarm 74 are connected in parallel with the variable resistor 75. When the strain of the first threaded cylinder 213 increases, the resistance value of the strain gauge 73 increases, and then the resulting voltage on the strain gauge circuit increases, and an alarm is sounded when the voltage reaches the voltage value of the induced voltage alarm 74.
The construction method of the small pit recoverable supporting structure of the embodiment comprises the following steps:
firstly, driving the steel sheet pile 1 into soil by a Hitachi 400 pile driver, inserting a water-swelling rubber strip 6 into a groove of the steel sheet pile, coating antirust paint and lubricant on the surface of the steel sheet pile, starting swelling after the water-swelling rubber strip 6 contacts water after the steel sheet pile 1 is driven into the soil, and filling gaps among the steel sheet piles to play a waterproof effect.
Step two, placing a horizontal support ring 2 when a foundation pit is excavated, firstly inserting a lock catch 51 of a self-locking structure 5 into a bent part of an I-shaped seat 22, then pulling down a handle 53 to self-lock the I-shaped seat 22 on a steel sheet pile 1, connecting a first support rod 21 with the I-shaped seat 22 by using a bolt, and radially inserting a second support rod 23 into a corresponding rod body of the first support rod 21; an early warning device 7 is arranged on each first screw cylinder 213.
And thirdly, the negative poisson ratio anchor rod 3 is obliquely driven into the periphery by the MQT130 pneumatic anchor rod drilling machine, when the anchor rod 3 is subjected to tensile force, the anchor rod body 32 expands and presses the rubber 33 with rough surface, the sliding friction force is improved, higher supporting force is obtained, and the foundation pit inclination is prevented. Air bag type steel pipe soil nails 4 are vertically applied to the bottom of the foundation pit, and air bags 41 are filled with air, so that pit bottom uplift is prevented.
Step four, a recovery stage: after the entire construction of the foundation pit is completed, the anchor rod body 32 can be extruded to shrink, and the anchor rod can be recovered. Opening the sealing rubber 43 to release gas, recovering the steel pipe soil nails 4, pulling the handles 53, releasing the lock catches 51 to recover the horizontal support rings 2, and removing the steel sheet piles 1.
Example 2
As shown in fig. 12, this embodiment is based on embodiment 1, in which a third support bar 25 is added vertically. The third supporting rod 25 includes a third left threaded rod 251, a third right threaded rod 252 and a third threaded cylinder 253 which are coaxial, and the third threaded cylinder 253 is arranged between the third left threaded rod 251 and the third right threaded rod 252. The third screw barrel 253 is provided with a solid middle part and hollow cavities for the third left threaded rod 251 and the third right threaded rod 252 to stretch and retract at the end parts. The I-shaped seat 22 and the third supporting rod 25 can form a quadrangle in a plane so as to ensure that equipment such as a shield machine and the like which drills into soil can safely enter and exit.
Example 3
As shown in fig. 13, this embodiment is based on embodiment 1 with the addition of a second support bar 23. Adjacent two first support rods 21 are detachably connected with a second support rod 23 forming a triangle structure with the first support rods near the connection position. Both ends of the second support rod 23 are provided with downward bending parts 24, and the bending parts 24 are radially inserted into the corresponding rod bodies of the first support rods 21. The second support rod 23 includes a second left threaded rod 231, a second right threaded rod 232, and a second threaded cylinder 233 that are coaxial, and the second threaded cylinder 233 is disposed between the second left threaded rod 231 and the second right threaded rod 232. The middle part of the second thread cylinder 233 is a solid part, and the end parts are provided with cavities for the second left threaded rod 231 and the second right threaded rod 232 to stretch and retract.
Claims (3)
1. The utility model provides a small-size pit is recoverable to support structure which characterized in that: comprises a steel sheet pile (1), a horizontal supporting ring (2), a negative poisson ratio anchor rod (3) and a balloon steel pipe soil nail (4); the steel sheet pile (1) is formed into a cavity in the foundation pit through a self-locking structure (5), a plurality of horizontal support rings (2) are arranged on the inner wall of the steel sheet pile (1) in parallel, and a foundation pit early warning device (7) is arranged on the horizontal support rings (2); the anchor rod (3) with the negative poisson ratio is connected with the steel sheet pile (1) and is inserted into a soil body; the bottom of the cavity is provided with an air bag type steel pipe soil nail (4); a water-swelling rubber strip (6) is arranged at the joint of the steel sheet pile (1) and the steel sheet pile (1); the horizontal support ring (2) comprises a plurality of first support rods (21) with a telescopic function, the first support rods (21) are connected with each other in pairs through I-shaped seats (22) and second support rods (23), and the I-shaped seats (22) are connected with the steel sheet piles (1) through self-locking structures (5);
The first support rod (21) comprises a first left threaded rod (211), a first right threaded rod (212) and a first thread cylinder (213) which are coaxial, and the first thread cylinder (213) is arranged between the first left threaded rod (211) and the first right threaded rod (212); the middle part of the first thread cylinder (213) is a solid part, and the end part is provided with a cavity for the expansion and contraction of the first left threaded rod (211) and the first right threaded rod (212); the solid part is uniformly provided with a plurality of jacks (2131) for installing the foundation pit early warning device (7) along the periphery of the solid part at intervals;
The first left threaded rod (211) is connected with a first right threaded rod (212) adjacent to the first left threaded rod through a bending part (24) and a second supporting rod (23);
The second supporting rod (23) comprises a second left threaded rod (231), a second right threaded rod (232) and a second threaded cylinder (233) which are coaxial, and the second threaded cylinder (233) is arranged between the second left threaded rod (231) and the second right threaded rod (232); the middle part of the second thread cylinder (233) is a solid part, and the end parts of the second thread cylinder are provided with cavities for the second left threaded rod (231) and the second right threaded rod (232) to stretch;
The anchor rod (3) with the negative poisson ratio comprises an anchor head (31), an anchor rod body (32), rubber (33), a base plate (34) and a nut (35), wherein the anchor rod (3) with the negative poisson ratio is connected with the steel sheet pile (1) through the base plate (34) and the nut (35), the anchor head (31) is connected with the anchor rod body (32) through a T-shaped opening (311), and the rubber (33) with a rough surface is arranged on the outer surface of the anchor rod body (32);
The air bag type steel pipe soil nail (4) comprises an air bag (41), an anchor head (42) and sealing rubber (43), one end of the air bag (41) is connected with the sealing rubber (43), the other end of the air bag is connected with the anchor head (42), and the sealing rubber (43) is used for inflating and fastening the air bag (41);
The self-locking structure (5) comprises a lock catch (51), a spring (52), a handle (53), a connecting plate (54), a support (55) and a transmission rod (56), wherein the lock catch (51) is fixedly clamped with the I-shaped seat (22), the spring (52) is nested on the lock catch (51), one end of the spring (52) is fixedly connected with the connecting plate (54), and the other end of the spring is fixedly connected with the transmission rod (56); the handle (53) is hinged with the transmission rod (56), the support (55) is fixedly connected with the steel sheet pile (1), and the handle (53) can drive the transmission rod (56) to slide into a groove on the surface of the connecting plate (54);
The foundation pit early warning device (7) comprises a power supply (71), a switch (72), a strain gauge (73), an induced voltage alarm (74) and a variable resistor (75), wherein the variable resistor (75) is connected with the power supply (71) and the switch (72) in series, and the strain gauge (73), the induced voltage alarm (74) and the variable resistor (75) are connected in parallel.
2. The small pit recoverable support structure of claim 1, wherein: the I-shaped seats (22) are connected with each other along the direction perpendicular to the horizontal support ring (2) through a third support rod (25) with a telescopic function, and the structure of the third support rod (25) is the same as that of the first support rod (21).
3. The construction method of a small pit recoverable support structure according to claim 1 or 2, comprising the steps of:
firstly, inserting a rubber strip (6) and steel sheet piles (1), and starting to expand after the rubber strip (6) contacts water to fill gaps between the steel sheet piles (1);
step two, excavating a foundation pit, placing a horizontal support ring (2), inserting a self-locking structure (5) into an I-shaped seat (22) and self-locking the self-locking structure on a steel sheet pile (1), installing a foundation pit early warning device (7) on a first support rod (21), connecting the first support rod (21) with the I-shaped seat (22), radially inserting a second support rod (23) on the corresponding first support rod (21) through a bending part, and connecting the second support rod (23) on the first support rod (21);
Step three, driving a negative poisson ratio anchor rod (3) obliquely along the foundation pit, and vertically driving an air bag type steel pipe soil nail (4) at the bottom of the foundation pit;
And fourthly, after construction is finished, extruding the anchor rod (3) with negative poisson ratio to shrink, recovering the anchor rod, discharging gas of the air bag type steel pipe soil nails (4), recovering the steel pipe soil nails (4), opening the self-locking structure (5) to recover the horizontal support ring (2), and dismantling the steel sheet pile (1).
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| CN202311078878.2A CN117071596B (en) | 2023-08-24 | 2023-08-24 | Small-sized well pit recyclable supporting structure and construction method thereof |
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| CN202311078878.2A CN117071596B (en) | 2023-08-24 | 2023-08-24 | Small-sized well pit recyclable supporting structure and construction method thereof |
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| CN117071596B true CN117071596B (en) | 2024-05-24 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11247194A (en) * | 1998-03-02 | 1999-09-14 | Sakata Construction Co Ltd | Temporary earth-retaining construction method and device |
| CN204959768U (en) * | 2015-09-15 | 2016-01-13 | 中国民航大学 | A underground structure for airport |
| CN210658379U (en) * | 2019-08-20 | 2020-06-02 | 青岛建设集团有限公司 | Underground structure supporting construction of building |
| CN212721283U (en) * | 2020-07-10 | 2021-03-16 | 广西科技大学 | Bridge intelligent support alarm |
| CN212742560U (en) * | 2020-06-19 | 2021-03-19 | 四川同风源建设工程有限公司 | Foundation pit supporting structure |
-
2023
- 2023-08-24 CN CN202311078878.2A patent/CN117071596B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11247194A (en) * | 1998-03-02 | 1999-09-14 | Sakata Construction Co Ltd | Temporary earth-retaining construction method and device |
| CN204959768U (en) * | 2015-09-15 | 2016-01-13 | 中国民航大学 | A underground structure for airport |
| CN210658379U (en) * | 2019-08-20 | 2020-06-02 | 青岛建设集团有限公司 | Underground structure supporting construction of building |
| CN212742560U (en) * | 2020-06-19 | 2021-03-19 | 四川同风源建设工程有限公司 | Foundation pit supporting structure |
| CN212721283U (en) * | 2020-07-10 | 2021-03-16 | 广西科技大学 | Bridge intelligent support alarm |
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| CN117071596A (en) | 2023-11-17 |
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