CN111501721A - Comprehensive construction method for soft soil area - Google Patents
Comprehensive construction method for soft soil area Download PDFInfo
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- CN111501721A CN111501721A CN202010270919.8A CN202010270919A CN111501721A CN 111501721 A CN111501721 A CN 111501721A CN 202010270919 A CN202010270919 A CN 202010270919A CN 111501721 A CN111501721 A CN 111501721A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of building engineering, and discloses a comprehensive construction method for a soft soil area, which comprises a soft foundation and comprises the following specific steps: (1) firstly, pre-pressing the soft foundation; (2) after the soil layer is consolidated and stabilized, pile foundation construction is started; a series of engineering problems such as foundation reinforcement, foundation pit support, pile foundation construction, bearing platform and foundation trench excavation can be solved at one time, and a good engineering effect is achieved; after the foundation is pre-pressed, a relative hard shell layer is formed at the upper part of the field, which is very beneficial to the foundation construction of the pipe pile and the quality guarantee of the pipe pile; on one hand, a stable construction operation surface is provided relative to the hard shell layer, so that the static pressure pipe pile construction can be smoothly carried out; on the other hand, the hard shell layer provides enough bearing capacity and lateral limitation, and deviation, inclination and even pile breakage caused by peripheral disturbance after the pipe pile construction are avoided.
Description
Technical Field
The invention relates to the technical field of building engineering, in particular to a comprehensive construction method for a soft soil area.
Background
Along with the development of economy, the urbanization pace is accelerated, and in cities with increasingly tense land, the development of underground spaces by combining with city construction and transformation becomes a necessity, such as multi-storey basements of high-rise buildings, subways, underground passages, underground parking garages, underground malls, underground substations, underground warehouses, underground civil houses and various underground civil and public facilities, and the like, in the development and utilization process of the underground spaces, deep foundation pit engineering becomes an indispensable project; the construction method is characterized in that the soft foundation is frequently encountered in the construction process of the deep foundation pit, and has the characteristics of high natural water content, large void ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, poor water permeability, complex soil layer distribution and large physical and mechanical property difference among layers, so that the bearing capacity of the foundation is generally very low, the overall stability is poor, deep slippage is easily caused in the construction of excavating the foundation pit, and the problem needs to be solved by adopting corresponding measures.
In the prior art, various supports are adopted to firstly support a foundation pit, then earthwork is excavated to the bottom of the foundation pit, the pit bottom is changed and filled, then pile foundation construction is carried out, and then supporting, core tube supporting and excavation are carried out.
Disclosure of Invention
The invention aims to provide a comprehensive construction method for a soft soil area, and aims to provide an efficient comprehensive construction method for the soft soil area.
The invention is realized in this way, the comprehensive construction method of the soft soil area, including soft foundation, the concrete steps are as follows:
(1) firstly, pre-pressing the soft foundation;
(2) after the soil layer is consolidated and stabilized, pile foundation construction is started;
(3) then carrying out slope releasing construction on the soft foundation to form a slope releasing part, inserting a plurality of metal anchor rods into the slope releasing part, then spraying concrete flows to the inserted metal anchor rods by using a high-pressure concrete device, respectively pouring a plurality of concrete flows on the metal anchor rods, and forming spray anchor support after the concrete is solidified;
(4) and using a plurality of large excavators to excavate the earthwork of the foundation pit, the bearing platform and the foundation trench at one time.
Further, when pile foundation construction is performed in the step (2), a grouting platform is built near a pile hole, the grouting platform and a grouting vehicle are used for manufacturing a grouting pile for the pile hole, and then the pile foundation is constructed and formed.
Further, when pile foundation construction is carried out in the step (2), a precast pile is put into the pile hole, and the pile foundation is formed after the precast pile is combined with the pile hole.
Further, in the step (3), underground water at the top of the slope is blocked by using a stirring pile and a waterproof curtain; the waterproof curtain is a grouting waterproof curtain.
Furthermore, the grouting platform comprises a fixing piece, a buffer piece and a replacing piece; the fixing piece comprises a bottom plate and a fixing plate which is connected with the buffer piece in a hinged mode, the fixing plate and the bottom plate are fixedly connected in an up-and-down mode, four sides of the bottom surface of the bottom plate are bent downwards to form a bent portion, a plurality of blunt blocks are arranged on the inner periphery of the bent portion, and when the bottom plate is placed on the ground, the blunt blocks drive the bottom plate to be incapable of moving; the fixing plate is fixedly connected with the bottom plate, a plurality of threaded holes are formed in the fixing plate, and the buffer piece is in threaded connection with the fixing plate through the threaded holes.
Furthermore, the buffer piece comprises a spring layer formed by arranging a plurality of springs side by side, an upper steel plate and a lower steel plate which are respectively connected with the upper end and the lower end of the spring layer, wherein a plurality of through holes are formed in the lower steel plate, and the through holes are in butt joint with the threaded holes one by one; the upper steel plate is formed with a recess into which the displacer is inserted.
Furthermore, the replacement part comprises a left side plate and a right side plate, the left side wall and the right side wall of the cavity are respectively connected with a hinge strip, and the hinge strips on the left side wall and the right side wall are respectively hinged with the left side plate and the right side plate; the left side board with when the right side board is kept flat, the butt of each other, just the left side board with all sunken circular arcs on the right side board, the left side board with the circular arc concatenation on the right side board is formed with the butt through-hole.
Furthermore, a buffering through hole and an alignment through hole are formed in the buffering piece, the buffering through hole penetrates through the spring layer and the lower steel plate up and down, the alignment through hole penetrates through the upper steel plate up and down and is located in the concave cavity, the alignment through hole is located in a penetrating area of the penetrating through hole, and the diameter of the alignment through hole is consistent with that of the abutting through hole; the springs are arranged around the buffer through hole and are arranged side by side.
Furthermore, a fixing through hole is formed in the fixing piece, the diameter of the fixing through hole is smaller than that of the pile hole, the fixing through hole penetrates through the fixing plate and the bottom plate, positioning blocks are further arranged on the downward bottom surface of the bottom plate, and the positioning blocks are in threaded connection with the bottom surface of the bottom plate; the positioning blocks are arranged around the periphery of the fixing through hole and are vertically arranged, and the outer diameter of the circumference formed by the plurality of positioning blocks in a surrounding mode is smaller than the diameter of the pile hole.
Further, the diameter of the abutting through hole is larger than that of the buffering through hole and that of the fixing through hole, and the diameters of the buffering through hole and the fixing through hole are consistent; the butt through hole, the alignment through hole, the buffer through hole and the fixing through hole are arranged in an up-and-down opposite mode.
Compared with the prior art, the comprehensive construction method for the soft soil area can solve a series of engineering problems of foundation reinforcement, foundation pit support, pile foundation construction, cushion cap and foundation trench excavation and the like at one time, and achieves good engineering effect; after the foundation is pre-pressed, a relative hard shell layer is formed at the upper part of the field, which is very beneficial to the foundation construction of the pipe pile and the quality guarantee of the pipe pile; on one hand, a stable construction operation surface is provided relative to the hard shell layer, so that the static pressure pipe pile construction can be smoothly carried out; on the other hand, the hard shell layer provides enough bearing capacity and lateral limitation, and deviation, inclination and even pile breakage caused by peripheral disturbance after the pipe pile construction are avoided; after the foundation is pre-pressed, the foundation pit can be excavated by directly adopting slope excavation without arranging other supporting structures and changing and filling stone slag at the pit bottom, so that the construction dock workload is reduced, and the construction dock is economical and environment-friendly; after the foundation is pre-pressed, the bearing platform and the foundation trench can be excavated along with the earthwork of the foundation pit, so that secondary support is reduced, construction can be accelerated, and comprehensive cost is saved.
Drawings
FIG. 1 is a schematic step diagram of the comprehensive construction method for soft soil areas provided by the present invention;
FIG. 2 is a horizontal cross-sectional view of the plastic drainage strip provided by the present invention;
FIG. 3 is a left side cross-sectional view of a grouting table provided by the present invention;
FIG. 4 is a right side cross-sectional view of a high pressure concrete apparatus provided by the present invention;
FIG. 5 is a schematic left side view of a platen according to the present invention;
FIG. 6 is a left side schematic view of a roller member provided by the present invention;
fig. 7 is a schematic cross-sectional view of a soft foundation and a plastic drainage strip provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-7, preferred embodiments of the present invention are provided.
The comprehensive construction method for the soft soil area provided by the embodiment can be used for constructing the soft soil area.
The comprehensive construction method for the soft soil area comprises a soft foundation 30 and comprises the following specific steps:
(1) firstly, pre-pressing the soft foundation 30;
(2) after the soil layer is consolidated and stabilized, pile foundation construction is started;
(3) then carrying out slope releasing construction on the soft foundation 30 to form a slope releasing part, inserting a plurality of metal anchor rods into the slope releasing part, then spraying concrete flows to the inserted metal anchor rods by using a high-pressure concrete device, respectively pouring a plurality of concrete flows on the metal anchor rods, and forming spray anchor support after the concrete is solidified;
(4) and using a plurality of large excavators to excavate the earthwork of the foundation pit, the bearing platform and the foundation trench at one time.
The comprehensive construction method for the soft soil area can solve a series of engineering problems of foundation reinforcement, foundation pit support, pile foundation construction, cushion cap and foundation trench excavation and the like at one time, and achieves good engineering effect; after the foundation is pre-pressed, a relative hard shell layer is formed at the upper part of the field, which is very beneficial to the foundation construction of the pipe pile and the quality guarantee of the pipe pile; on one hand, a stable construction operation surface is provided relative to the hard shell layer, so that the static pressure pipe pile construction can be smoothly carried out; on the other hand, the hard shell layer provides enough bearing capacity and lateral limitation, and deviation, inclination and even pile breakage caused by peripheral disturbance after the pipe pile construction are avoided; after the foundation is pre-pressed, the foundation pit can be excavated by directly adopting slope excavation without arranging other supporting structures and changing and filling stone slag at the pit bottom, so that the construction dock workload is reduced, and the construction dock is economical and environment-friendly; after the foundation is pre-pressed, the bearing platform and the foundation trench can be excavated along with the earthwork of the foundation pit, so that secondary support is reduced, construction can be accelerated, and comprehensive cost is saved.
The pre-pressing treatment comprises vacuum pre-pressing, surcharge pre-pressing or vacuum surcharge combined pre-pressing; the vacuum preloading is to arrange a plastic drainage belt 29 or a sand well in the soft foundation 30, insert the plastic drainage belt 29 or the sand well, lay a filter pipe and a main drainage pipe, cover geotextile and a vacuum film on the soft foundation 30, and then perform vacuum preloading on the soft foundation 30 to quickly consolidate the soil layer of the soft foundation 30;
the preloading is to arrange a plastic drainage belt 29 or a sand well in the soft foundation 30, arrange a sand cushion layer, a water collecting well and a drainage ditch, and fill soil on the soft foundation 30 to quickly consolidate the soil layer of the soft foundation 30, and use a comprehensive construction structure in a soft soil area to carry out back pressure on the soft foundation 30 to drive the soft foundation 30 to be more quickly consolidated with the soil layer.
And (3) when the pile foundation is constructed in the step (2), constructing a grouting platform near the pile hole, manufacturing a cast-in-place pile in the pile hole by using the grouting platform and a grouting vehicle, and then constructing to form the pile foundation.
Or another embodiment: and (3) when the pile foundation is constructed in the step (2), using the precast pile to be put into the pile hole, and forming a pile foundation after the precast pile is combined with the pile hole.
And pile foundation construction except can adopting bored concrete pile construction and utilizing the precast pile construction, still can adopt static pressure tubular pile, hammering tubular pile construction, and the bored concrete pile is selected for use to be under construction in this embodiment, but is not limited to the bored concrete pile construction.
Wherein, the plastic drainage strip 29 comprises a core plate 11 and filter membranes 12, and the filter membranes 12 cover two sides of the core plate 11; a plurality of cuboid pipelines are formed on the core plate 11, the cross section of the core plate 11 comprises a plurality of squares which are arranged in an inclined 45-degree mode, the top angles of the squares are connected, and the squares are transversely arranged in rows, so that the drainage capacity of the drainage pipe can be improved.
The filter membrane 12 is also provided with a plurality of parallel strip grooves, and the upper vertex angles and the lower vertex angles of a plurality of cuboid pipelines are respectively embedded into the plurality of parallel strip grooves; the top angle of the cuboid pipeline is coupled with the parallel grooves by using a coupling agent, and the filter membrane 12 and the core plate 11 are used, and the core plate 11 and the filter membrane 12 pass through.
Wherein, in the step (3), the stirring piles and the waterproof curtain are used for separating the underground water at the top of the slope; the waterproof curtain is a grouting waterproof curtain which is a general name of a waterproof series at the periphery of the engineering main body and is used for preventing or reducing continuous water stopping bodies which are adopted when underground water on the side wall of the foundation pit and the bottom of the foundation pit flows into the foundation pit; the technical key points of the grouting waterproof curtain are as follows: in material selection, a construction unit is generally recommended to use ordinary cement or superfine cement as a main grouting material; grouting is performed on the sleeve valve pipe part in a segmented mode in a vertical retreating mode, and grouting parameters are set according to the actual situation of geology; the sleeve valve pipe is a one-way sleeve valve type plastic pipe, a group of grout overflow holes are formed in the outer side of the pipe every 33cm, and rubber sleeves cover the outside of the grout overflow holes, so that grout can be guaranteed to be injected into the stratum under the pressure condition, water and sand in the stratum are prevented from entering the grouting pipe, the grouting construction effect is prevented from being affected, and the grouting water-stopping curtain technology and the mixing piles are utilized, so that the quick and stable prepressing can be realized in a construction site with more sludge.
The grouting table comprises a fixing piece 14, a buffer piece 15 and a displacement piece 16; the fixing part 14 comprises a bottom plate and a fixing plate linked with the buffer part 15, the fixing plate and the bottom plate are fixedly connected up and down, four sides of the bottom surface of the bottom plate are bent downwards to form a bent part, the inner periphery of the bent part is provided with a plurality of blunt blocks 13, and when the bottom plate is placed on the ground, the blunt blocks 13 drive the bottom plate to be incapable of moving; the fixing plate is fixedly connected with the base plate, a plurality of threaded holes are formed in the fixing plate, and the buffer piece 15 is in threaded connection with the fixing plate through the threaded holes.
The blunt block 13 is in a spherical shape, and the bending angle of the inner periphery of the bending part is less than 10 degrees; the bottom plate is made of stainless steel, so that the bottom plate is prevented from rusting due to the influence of water vapor in the grouting process; the plurality of blunt blocks 13 are arranged alternately at the inner circumference of the bent portion, and the edge of the bent portion is also arranged in a bent manner, and the blunt blocks 13 are combined to increase the frictional force of the base plate.
Still another embodiment, the middle part of the four sides of bottom plate parallel extension outwards has the fixed block, the fixed block with level and smooth arranging, the end that the fixed block deviates from the bottom plate is equipped with the mounting hole, the workman can beat the fixed column toward subaerial through the mounting hole, like this, when the fixed plate is more and softer subaerial in silt, can further fixed plate.
The buffer piece 15 comprises a spring layer formed by arranging a plurality of springs side by side, an upper steel plate and a lower steel plate which are respectively connected with the upper end and the lower end of the spring layer, a plurality of through holes are formed in the lower steel plate, and the through holes are in butt joint with the threaded holes one by one; the upper steel plate is formed with a recess into which the displacer 16 is inserted.
The displacement piece 16 comprises a left side plate 17 and a right side plate 18, the left side wall and the right side wall of the cavity are respectively connected with a hinge strip, and the hinge strips on the left side wall and the right side wall are respectively hinged with the left side plate 17 and the right side plate 18; when left side board 17 and right side board 18 are kept flat, the butt of each other, and all sunken have the circular arc on left side board 17 and the right side board 18, and the circular arc concatenation on left side board 17 and the right side board 18 is formed with the butt through-hole.
A buffer through hole and an alignment through hole are formed in the buffer piece 15, the buffer through hole penetrates through the spring layer and the lower steel plate up and down, the alignment through hole penetrates through the upper steel plate up and down and is located in the concave cavity, the alignment through hole is located in a penetrating area of the penetrating through hole, and the diameter of the alignment through hole is consistent with that of the abutting through hole; the plurality of springs are arranged around the buffer through hole and arranged side by side.
Wherein, a fixing through hole is formed on the fixing piece 14, the diameter of the fixing through hole is smaller than that of the pile hole, the fixing through hole penetrates through the fixing plate and the bottom plate, a positioning block 19 is also arranged on the downward bottom surface of the bottom plate, and a plurality of positioning blocks 19 are in threaded connection with the bottom surface of the bottom plate; the positioning blocks 19 are arranged around the periphery of the fixing through hole, the positioning blocks 19 are vertically arranged, and the outer diameter of the circumference formed by the positioning blocks 19 is smaller than the diameter of the pile hole.
The diameter of the abutting through hole is larger than that of the buffering through hole and that of the fixing through hole, and the diameters of the buffering through hole and the fixing through hole are consistent; the diameter of the fixing through hole is smaller than that of the pile hole; the abutting through hole, the aligning through hole, the buffering through hole and the fixing through hole are arranged in an up-and-down opposite mode.
Wherein, after the grouting platform is built in the step (2), a guide pipe is arranged on the grouting platform, and the peripheral diameter of the guide pipe is consistent with the inner diameters of the buffer through hole and the fixed through hole.
After the pile hole is constructed, the reinforcement cage needs to be put into the pile hole in advance, then the grouting platform is built, and after the grouting platform is built, the conduit is poured by the grouting machine.
Wherein high-pressure concrete device includes injection apparatus 20 and is connected to the spray tube of mixer, injection apparatus 20 includes heating member 23, internal pipeline 21, shell and electric pump 22, wherein electric pump 22 is connected with internal pipeline 21, and internal pipeline 21 is located the shell, and heating member 23 is located the bottom of shell, heat internal pipeline 21, furthermore, the spray tube is connected with electric pump 22, electric pump 22 orders concrete pressure to send to the jet orifice, the jet orifice is connected with high-pressure spray tube, wherein the front end of high-pressure spray tube is connected with the extrusion head, the extrusion head is little back big arrangement in the front, and the extrusion head cavity has the injection transfer pipe, thereby make the concrete spray away from the extrusion head.
There is also a comprehensive construction structure for soft soil areas, comprising a roller member 28 for flattening the ground and a flattening member 24, the roller member 28 being connected to the front end of the trailer, the flattening member 24 being arranged at the rear end of the trailer; the roller member 28 comprises a roller and a mounting rack, the mounting rack is arranged at two ends of the trailer and extends forwards, and the roller is connected with a mounting rack bearing; the pressing piece 24 comprises a rear frame and a spring plate fastened with the rear frame, the spring plate comprises an upper pressing plate 25 and a lower pressing plate 27, the upper pressing plate 25 and the lower pressing plate 27 are connected through a spring set, and when the spring plate vibrates, the upper pressing plate 25 drives the lower pressing plate 27 to press the ground.
Through setting up roller spare 28 and flattening piece 24 on the trailer, the trailer uses roller spare 28 in advance to flatten the road surface on the route of travel, and because the weight of trailer itself can lead to the ground can appear the trace that the ground surface is cracked such as the child seal, so utilize flattening piece 24 to carry out the secondary to the ground after the trailer passes through and flatten, utilize the secondary to flatten and can let the trailer to the pre-compaction of weak ground 30 more complete for soft ground 30 is used for piling and digging the foundation ditch more easily.
Wherein the rear frame is formed with the installation department in the horizontal direction deviating from the roller spare 28 extension, and the spring plate includes the lock joint hook that upwards extends to arrange, and the lock joint hook has the hook, and the hook is arranged with the installation department lock joint.
The upper portion of spring board is down crooked to be formed with the mounting bar in addition, and the rear end of lock joint hook is formed with the lock joint through-hole, is formed with the stable through-hole unanimous with lock joint through-hole diameter on the mounting bar, and stable through-hole is just to arranging about with the lock joint through-hole, and uses the cutting to insert stable through-hole and lock joint through-hole, mounting bar and lock joint hook junction.
The spring plate comprises a lower pressing plate 27, an upper pressing plate 25 and a spring group, the spring group is connected with the upper pressing plate 25 and the lower pressing plate 27, and the spring group comprises a plurality of springs which are arranged side by side.
An upper pressure plate 25 is arranged at the lower part of the lower pressure plate 27, and the upper part of the lower pressure plate 27 forms a mounting strip; the spring group is arranged on the upper surface of the lower pressing plate 27, a mounting groove for mounting the spring group is formed in the lower portion of the lower pressing plate 27, the upper pressing plate 25 is connected with the upper end of the spring group, and the lower end of the spring group is connected with the groove bottom of the mounting groove.
And a plurality of circular pits are formed at the bottom of the mounting groove, and a plurality of springs are respectively inserted into the circular pits to form a spring group.
There is also an opening for the upper press plate 25 to be inserted into the mounting groove, so that the position of the upper press plate 25 can be further fixed
Flattening piece 24 still includes rectangular pinch roller 26 of setting in holding down plate 27 below, and rectangular pinch roller 26 is connected with holding down plate 27, and when the trailer removed, rectangular pinch roller 26 compresses tightly ground.
And the two sides of the lower part of the lower pressing plate 27 are provided with vertical bars movably connected with the long pressing wheel 26, and the left end and the right end of the long pressing wheel 26 are respectively connected with vertical bar bearings.
Wherein the lower surface of the lower part of the lower pressing plate 27 is arranged obliquely downwards along the direction horizontally departing from the rollers, and the tail end of the lower part of the lower pressing plate 27 is on the same horizontal line with the lower part of the long pressing wheel 26.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The comprehensive construction method of the soft soil area is characterized by comprising a soft foundation, and the method comprises the following specific steps:
(1) firstly, pre-pressing the soft foundation;
(2) after the soil layer is consolidated and stabilized, pile foundation construction is started;
(3) then carrying out slope releasing construction on the soft foundation to form a slope releasing part, inserting a plurality of metal anchor rods into the slope releasing part, then spraying concrete flows to the inserted metal anchor rods by using a high-pressure concrete device, respectively pouring a plurality of concrete flows on the metal anchor rods, and forming spray anchor support after the concrete is solidified;
(4) and using a plurality of large excavators to excavate the earthwork of the foundation pit, the bearing platform and the foundation trench at one time.
2. A comprehensive construction method for a soft soil area according to claim 1, wherein when the pile foundation is constructed in the step (2), a grouting platform is built near the pile hole, and the pile hole is grouted by using the grouting platform and a grouting vehicle, and then the pile foundation is built.
3. A comprehensive construction method for a soft soil area according to claim 1, wherein in the step (2), when the pile foundation is constructed, a precast pile is put down into the pile hole, and the pile foundation is formed after the precast pile is combined with the pile hole.
4. A comprehensive construction method for a soft soil area according to any one of claims 1 to 3, wherein in the step (3), the top of the slope-releasing part is blocked from ground water by using a mixing pile and a waterproof curtain; the waterproof curtain is a grouting waterproof curtain.
5. A comprehensive construction method for soft soil areas according to claim 2, wherein said grouting platform comprises a fixing member, a buffer member and a displacement member; the fixing piece comprises a bottom plate and a fixing plate which is connected with the buffer piece in a hinged mode, the fixing plate and the bottom plate are fixedly connected in an up-and-down mode, four sides of the bottom surface of the bottom plate are bent downwards to form a bent portion, a plurality of blunt blocks are arranged on the inner periphery of the bent portion, and when the bottom plate is placed on the ground, the blunt blocks drive the bottom plate to be incapable of moving; the fixing plate is fixedly connected with the bottom plate, a plurality of threaded holes are formed in the fixing plate, and the buffer piece is in threaded connection with the fixing plate through the threaded holes.
6. The comprehensive construction method for soft soil areas according to claim 5, wherein the buffer member comprises a spring layer formed by arranging a plurality of springs side by side, an upper steel plate and a lower steel plate which are respectively connected with the upper end and the lower end of the spring layer, a plurality of through holes are formed in the lower steel plate, and the through holes are in butt joint with the threaded holes one by one; the upper steel plate is formed with a recess into which the displacer is inserted.
7. The comprehensive construction method for soft soil areas according to claim 6, wherein the displacement member comprises a left side plate and a right side plate, the left side wall and the right side wall of the cavity are respectively connected with a hinge strip, and the hinge strips on the left side wall and the right side wall are respectively hinged with the left side plate and the right side plate; the left side board with when the right side board is kept flat, the butt of each other, just the left side board with all sunken circular arcs on the right side board, the left side board with the circular arc concatenation on the right side board is formed with the butt through-hole.
8. A comprehensive construction method for a soft soil area according to claim 7, wherein a buffer through hole and an alignment through hole are formed on the buffer member, the buffer through hole vertically penetrates through the spring layer and the lower steel plate, the alignment through hole vertically penetrates through the upper steel plate and is located in the cavity, the alignment through hole is located in a through area of the through hole, and the diameter of the alignment through hole is consistent with that of the abutment through hole; the springs are arranged around the buffer through hole and are arranged side by side.
9. The comprehensive construction method for soft soil areas according to claim 8, wherein the fixing member is formed with a fixing through hole, the diameter of the fixing through hole is smaller than that of the pile hole, the fixing through hole penetrates through the fixing plate and the bottom plate, a positioning block is further arranged on the downward bottom surface of the bottom plate, and a plurality of positioning blocks are in threaded connection with the bottom surface of the bottom plate; the positioning blocks are arranged around the periphery of the fixing through hole and are vertically arranged, and the outer diameter of the circumference formed by the plurality of positioning blocks in a surrounding mode is smaller than the diameter of the pile hole.
10. A comprehensive construction method for a soft soil area according to claim 9, wherein the diameter of the abutting through hole is larger than the diameter of the buffer through hole and the diameter of the fixing through hole, and the diameter of the buffer through hole is the same as the diameter of the fixing through hole; the butt through hole, the alignment through hole, the buffer through hole and the fixing through hole are arranged in an up-and-down opposite mode.
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| EP0648296B1 (en) * | 1991-11-04 | 1999-01-27 | Reinert, Gary L., Sr. | Prestressed caisson bearing pier and structural foundation device |
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