CN116607504A - Strong-rigidity truss type combined steel sheet pile supporting structure and construction process thereof - Google Patents
Strong-rigidity truss type combined steel sheet pile supporting structure and construction process thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 312
- 239000010959 steel Substances 0.000 title claims abstract description 312
- 238000010276 construction Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000003466 welding Methods 0.000 claims description 22
- 229920001971 elastomer Polymers 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 6
- 229920002396 Polyurea Polymers 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 239000002689 soil Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 2
- 210000004258 portal system Anatomy 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005728 strengthening Methods 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
- 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
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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
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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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
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a high-rigidity truss type combined steel sheet pile supporting structure, which comprises the following components: n rows of supporting bodies are arranged outside the foundation pit enclosure sideline pit, a plurality of Larson steel sheet piles are arranged between the adjacent supporting bodies, and equilateral triangle arrangement is formed between two adjacent supporting bodies of the N rows and the supporting bodies at the corresponding positions of the N+1 rows; the invention also discloses a construction process of the high-rigidity truss type combined steel sheet pile supporting structure. Through the mode, the problems that the existing foundation pit supporting forms are small in overall strength, low in construction efficiency and non-adjustable in overall rigidity are solved.
Description
Technical Field
The invention relates to the field of building construction, in particular to a high-rigidity truss type combined steel sheet pile supporting structure and a construction process thereof.
Background
With the development of the times, the urban steps of China are faster, the cities are continuously developed and expanded, more complex buildings are continuously evolved from the urban complex operation modes, the large-area foundation pit construction attached to project engineering is also increased, the project is also challenged by various geological conditions and various surrounding environment conditions, and the requirements on foundation pit supporting technology are also higher.
The foundation pit with the common underground one-layer structure basically adopts the support forms of a slope-releasing soil nailing wall, cantilever piles and double-row piles, wherein the support forms of the cantilever piles are more, the common support forms of the foundation pit with the cantilever structure comprise Lasen steel sheet piles, PC construction method piles, HUC combined steel sheet piles, prefabricated support pipe piles, SMW construction method piles, bored cast-in-situ piles and the like, but the cantilever structure can not meet the requirements of the foundation pit engineering at present, and more projects begin to adopt the support forms of the double-row piles or the multiple-row piles, wherein the common support forms of the double-row piles comprise double-row construction method piles, double-row cast-in-situ piles, double-row steel sheet piles and the like.
The conventional double-row pile support mainly comprises the following forms:
1. the double-row bored pile is a bored pile constructed in a front row and a rear row according to the design calculation row spacing, and the foundation pit supporting technology for connecting the two rows of bored piles by using the concrete connecting beam has the advantages of higher overall rigidity and higher safety; the construction method is simple, the construction is carried out by adopting conventional construction machinery, the construction process is mature, and certain defects still exist: 1. the enclosing purlin and the connecting beam can only adopt concrete enclosing purlin basically, and the concrete enclosing purlin can be excavated after reaching maintenance time and meeting design strength, which affects construction period. Meanwhile, the bored pile itself also needs to meet maintenance time and can be excavated after reaching design strength, and the construction period is greatly influenced; 2. the bored pile adopts a mud wall protection process, a mud discharge tank and a circulating tank are required to be arranged on site, and the environmental protection on site is very unfavorable; 3. the cost of the bored pile is higher, and compared with other construction techniques, the cost exceeds more, which is very unfavorable for the cost control.
2. The double-row SMW construction method piles are foundation pit supporting technology for constructing the SMW construction method piles at the front row and the rear row according to the design calculation row distance, and the two rows of SMW construction method piles are connected by using the concrete connecting beam; the construction method is simple, the construction is carried out by adopting conventional construction machinery, the construction process is mature, and certain defects still exist: 1. the enclosing purlin and the connecting beam can only adopt concrete enclosing purlin basically, and the concrete enclosing purlin can be excavated after reaching maintenance time and meeting design strength, which affects construction period. Meanwhile, the triaxial mixing pile also needs to meet maintenance time and can be excavated after reaching design strength, and the construction period is greatly influenced; 2. when the triaxial mixing pile is mechanically constructed, soil bodies in a construction area need to be replaced, and the triaxial mixing pile is piled on site or transported out for treatment, so that the site environment is greatly influenced.
3. The double-row steel sheet piles are foundation pit supporting technology for constructing Larson steel sheet piles at the front row and the rear row according to the calculated row distance by design, and the two rows of Larson steel sheet piles are connected by using steel bars or steel strands; the material can be recycled, the cost can be effectively saved, and the economic effect is higher; the construction method is simple, the construction is carried out by adopting conventional construction machinery, and the construction process is mature; all are prefabricated steel materials, the waiting for maintenance time is not needed, the construction period can be saved, and certain defects still exist: 1. the front and rear rows of steel sheet piles are connected only by welding steel bars or steel strands, and under the condition of high soil pressure, the welding points are easy to collapse and lose efficacy, so that the whole portal system is disassembled, and the safety of a foundation pit is greatly influenced; 2. the lower influence of the material rigidity of the steel sheet pile in the Lawson is that the overall rigidity of the double-row steel sheet pile is improved more limited, the adaptability is poorer, and the requirements of deeper foundation pits and poorer soil layers can not be met.
Chinese patent CN215105387U discloses a double-row space combined foundation pit supporting structure of lassen steel sheet piles and steel pipe piles, which comprises an inner row pile body, wherein the inner row pile body is composed of inner row steel pipe piles and inner row lassen steel sheet pile segments; the inner-row Larson steel plate pile section comprises at least two Larson steel plate piles, each Larson steel plate pile of the inner-row Larson steel plate pile section and the adjacent Larson steel plate pile are hooked with each other through respective second locking plates, and the second locking plates on two sides of the inner-row Larson steel plate pile section are hooked with the first locking plates of the adjacent inner-row steel pipe piles; the inner steel pipe pile row is welded with a first locking plate extending backwards at intervals, and each first locking plate extending backwards is correspondingly provided with a longitudinal Lasen steel plate pile section and an outer steel pipe pile row. The Larson steel sheet pile and steel pipe pile double-row space combined type foundation pit supporting structure is high in rigidity, strong in supporting performance and good in soil body lateral pressure resisting effect.
However, the foundation pit supporting structure has the following defects:
1. the front and rear rows of steel pipe piles are arranged in a rectangular combination mode, the stability of the rectangular combination mode is poor, the stability continuously decreases along with the increase of the row distance of the front and rear rows of piles, and the steel plate pile connecting beam is a weak point when the soil pressure is high, so that the steel plate pile connecting beam is easy to shear and break, and the portal structure of the double-row piles is disintegrated;
2. the Larson steel sheet piles and the steel pipe piles are connected by adopting small rabbets, the connection mode is weaker, the field construction is poor in connection effect by utilizing the small rabbets, some projects can not be smoothly connected even by utilizing the small rabbets, the joints can not be used as weak points, so that the whole stress of the enclosure structure is influenced, the points of soil pressure damage are often the weak points, in addition, the difficulty of small rabbet connection also causes the problem that the water stopping performance is greatly reduced, a reliable water stopping curtain can not be formed, seepage, soil flowing and the like easily occur in the later foundation pit excavation stage, and the safety of the foundation pit is influenced;
3. at present, according to the exploration direction of the patent, only the double-row space combination type is considered, the exploration of the multi-row space combination type is still blank, the exploration is limited by the defects of larger bending moment, weaker small tongue-and-groove at the connecting point and the like of the rectangular combination type, if the multi-row space combination type is adopted, the possibility of deformation of the whole structure is higher, and especially the damage is very easy to occur at the connecting point of the steel sheet pile and the steel pipe pile, so that the patent is limited to the double-row space combination type at present.
Disclosure of Invention
In order to solve the problems, the invention provides a high-rigidity truss type combined steel sheet pile supporting structure and a construction process thereof, and solves the problems of small strength and low construction efficiency of the existing foundation pit supporting forms.
The main content of the invention comprises: a strong stiffness "truss" composite sheet pile support structure comprising: n rows of supporting bodies are arranged outside the foundation pit enclosure sideline pit, a plurality of Larson steel sheet piles are arranged between the adjacent supporting bodies, and equilateral triangle arrangement is formed between two adjacent supporting bodies of the N rows and the supporting bodies at the corresponding positions of the N+1 rows;
the Larson steel sheet piles are connected with the supporting bodies through lock catches, H-shaped steel purlins are respectively arranged on two side surfaces of each group of Larson steel sheet piles, and the H-shaped steel purlins are connected with the supporting bodies through steel loose-leaf joints;
the lock catch comprises: the first locking notch connecting piece is connected with the Larson steel sheet pile, the cross section of which is in an open circular shape, and the second locking notch connecting piece is connected with the support body, the cross section of which is in a closed circular shape, wherein the inner diameter of the first locking notch connecting piece is slightly larger than the outer diameter of the second locking notch connecting piece, and when the locking notch connecting piece is used, the first locking notch connecting piece is inserted into the periphery of the second locking notch connecting piece.
Preferably, the support body adopts one of steel pipe piles or H-shaped steel.
Preferably, a grouting port is formed in the middle of the second locking port connecting piece.
Preferably, the grouting openings can be filled with novel polyurea waterproof materials.
Preferably, rubber is adopted between the outer end face of the Larson steel sheet pile and the H-shaped steel purlin for packing.
Preferably, a hoop is arranged between the steel loose-leaf and the support body.
Preferably, rubber packing is used between the anchor ear and the support body.
Preferably, a lacing plate seal head is arranged at the top of the H-shaped steel enclosing purlin.
Preferably, a channel steel surrounding purlin is also arranged between the adjacent supporting bodies.
The invention also discloses a construction process of the high-rigidity truss type combined steel sheet pile supporting structure, which comprises the following steps:
s1, selecting the type of a support body according to the purchase difficulty level, project characteristics and complexity level of surrounding environment of the current market materials;
s2, after the type of the support body is determined, selecting a combination type with the integral rigidity closest to the project requirement according to the project characteristics and the allowable deformation size;
s3, according to project characteristics and allowable deformation sizes, the optimal combination pattern is precisely matched by adjusting the spacing between front row supports, the spacing between rear row supports and the size of front row and rear row spacing in the selected pattern;
s4, site measurement paying-off is carried out to determine construction positioning of the Larson steel sheet pile, and meanwhile, mechanical arrival preparation is carried out;
s5, conveying the lifting support body to a designed position by matching with a pile driving machine by using an excavator, centering and adjusting to ensure that the construction position is accurate, lightly hammering the pile to a plurality of times by using a vibrating hammer, measuring and correcting the pile, and then vibrating and pile sinking;
s6, sequentially constructing front and rear rows of support bodies, front and rear rows of Larson steel sheet piles and Larson steel sheet piles in a beam connecting area, wherein the Larson steel sheet piles are connected with the Larson steel sheet piles and the support bodies by adopting hollow circular ring lock catches, and the whole construction sequence is as follows: constructing front row supporting bodies and Larson steel sheet piles; then constructing Larson steel sheet pile connecting beams; finally, constructing a rear row of supporting bodies, and then constructing rear row of Larson steel sheet piles;
s7, placing the H-shaped steel purlin above the Larson steel sheet pile in the beam connecting area, pressing the H-shaped steel purlin down to reach a fixed position by using a digging machine, and pre-filling rubber at the contact position of the H-shaped steel purlin and the Larson steel sheet pile;
s8, welding the H-shaped steel purlin enclosing end socket lacing plates, and then fully welding the H-shaped steel purlin enclosing end socket lacing plates;
s9, welding a seal head plate on the upper part of the H-shaped steel enclosing purlin, and locking a steel hinge at a corresponding position by adopting a bolt;
s10, welding the steel anchor ear on the steel hinge, and pre-filling rubber at the contact position of the steel anchor ear and the supporting body;
s11, adjusting the steel anchor ear to encircle the support body until the reserved bolt holes on the front end lacing plate of the steel anchor ear are aligned, and locking by using high-strength bolts after alignment;
s12, welding channel steel surrounding purlins between adjacent supporting bodies for reinforcement.
The invention has the beneficial effects that:
1. by combining the support body with the Larson steel sheet pile, the combined pile has large integral rigidity and strong stability, and exceeds that of a common cantilever structure guard pile;
2. rigidity can be adjusted according to different combination types, and the combination types which are most in line with project requirements can be precisely matched;
3. the joint is sleeved by a hollow circular ring, and the whole water stopping performance is further improved in a later matched grouting mode, so that the water stopping performance can be used as a waterproof curtain;
4. multiple rows of truss type combination patterns can be adopted, so that the overall rigidity is further enhanced;
5. the full recovery of 100% can be realized, the construction can be realized by adopting conventional machinery, the customized professional mechanical construction is not needed, the construction speed is high, the work efficiency is high, the cost is low, and the mute and environment-friendly effects are realized;
6. because the whole material basically adopts steel components, the construction is effective immediately after completion, the waiting for maintenance time is not needed, the construction period can be greatly saved, and meanwhile, the construction method can be used as an effective rescue construction means when the foundation pit is rescue in site;
7. the Liang Caiyong Larson steel sheet piles are connected, and the enclosing purlins are connected by adopting a welding opposite-pulling (when H-shaped steel is adopted) or steel hoop (when steel pipe piles are adopted) connecting method, so that the defects of single fixing mode and unreliable connecting strength of the double-row combined steel sheet pile foundation pit and the connecting beam enclosing purlins are overcome, and a reliable and effective portal system is formed by the truss type steel sheet pile combination type.
Drawings
FIG. 1 is a plan view of a high stiffness "truss" composite sheet pile support structure of example 1;
FIG. 2 is a schematic structural view of a latch;
FIG. 3 is a plan view of an H-section steel purlin;
fig. 4 is a schematic structural view of the anchor ear;
FIG. 5 is a top view of the anchor ear in operation;
FIG. 6 is a side view of the anchor ear in operation;
FIG. 7 is a schematic view of a steel hinge;
FIG. 8 is a schematic structural view of an example 2 of a strong-stiffness "truss" composite steel sheet pile support structure;
FIG. 9 is a schematic diagram showing the connection of H-section steel and Larson steel sheet piles in example 2;
FIG. 10 is a plan view of an H-beam purlin in example 2;
FIG. 11 is a schematic view of an interface between an H-shaped steel and an H-shaped steel purlin in example 2;
reference numerals: 1. larson steel sheet pile, 2, larson steel sheet pile connecting beam, 3, support body, 4, lock catch, 5, H-shaped steel enclosing purlin, 6, anchor ear, 7, steel loose-leaf, 8, rubber, 9, channel steel enclosing purlin, 41, first locking port connecting piece, 42, second locking port connecting piece, 43, grouting port, 61, first anchor ear batten plate, 62, second anchor ear batten plate, 71, first loose-leaf plate, 72, second loose-leaf plate, 73, rotating shaft, 3', H-shaped steel, 31', H-shaped steel batten plate.
Detailed Description
The technical scheme protected by the invention is specifically described below with reference to the accompanying drawings.
Example 1
In example 1, steel pipe piles were used as the supporting bodies.
As shown in fig. 1-7, a strong stiffness "truss" composite steel sheet pile support structure comprising: n rows of steel pipe piles are arranged outside the foundation pit enclosure sideline pits, a plurality of Larson steel sheet piles 1 are arranged between the adjacent steel pipe piles, equilateral triangle arrangement is formed between two adjacent steel sheet piles of the N row and the steel sheet piles at the corresponding positions of the N+1 rows, and three sides of the equilateral triangle are formed by connecting a plurality of Larson steel sheet piles to form Larson steel sheet pile connecting beams 2;
as shown in fig. 2, the lason steel sheet pile 1 is connected with the steel pipe pile through a lock catch 4, the lock catch 4 is welded with the lason steel sheet pile 1 or the steel pipe pile, and the lock catch 4 comprises: the steel pipe pile comprises a first locking notch connecting piece 41 and a second locking notch connecting piece 42, wherein the first locking notch connecting piece 41 is connected with the Larson steel pipe pile 1 and has an open circular cross section, the second locking notch connecting piece 42 is connected with the steel pipe pile and has a closed circular cross section, the inner diameter of the first locking notch connecting piece 41 is slightly larger than the outer diameter of the second locking notch connecting piece 42, and when the steel pipe pile is used, the first locking notch connecting piece 41 is inserted into the periphery of the second locking notch connecting piece 42. One of the two locking openings of the same Larson steel sheet pile adopts an open circular ring structure, the other one adopts a closed circular ring structure, and when the adjacent Larson steel sheet piles are connected, the open circular ring of the first one corresponds to the closed circular ring lock catch of the second one, so that the connection of the two is realized. The grouting opening 43 is formed in the middle of the second locking connector, and when the two locking connectors are assembled, novel polyurea waterproof material is used for grouting reinforcement in the grouting opening 43, and the grouting opening 43 has the advantages of strong strength and bottom cohesiveness and good waterproof effect, and greatly improves the water stopping effect under the condition of not affecting later pulling.
As shown in fig. 3, two side surfaces of each group of lassen steel sheet piles are respectively provided with an H-steel purlin 5,H and an outer side surface of the steel sheet pile 1 vertically fixed Yu Lasen, and a contact part between the outer end surface of the lassen steel sheet pile 1 and the H-steel purlin 5 is filled with rubber, so that the water resistance (such as a part a cloud line area in fig. 3) is improved.
As shown in fig. 4 to 6, an anchor ear 6 is arranged between a steel loose-leaf 7 and a steel pipe pile, the anchor ear 6 adopts a mode of combining two semi-annular structures, a first anchor ear lacing plate 61 and a second anchor ear lacing plate 62 are respectively arranged at the opening of the anchor ear 6, the second anchor ear lacing plate 62 is connected with an H-shaped steel enclosing purlin 5 through the steel loose-leaf 7, and the two first anchor ear lacing plates 61 are fastened by adopting a bolt connection mode.
As shown in fig. 7, the steel leaflet 7 includes: the second loose-leaf plate 72 connected with the second hoop batten plate 62, the first loose-leaf plate 71 connected with the H-shaped steel enclosing purlin 5, and the rotating shaft 73 is arranged between the first loose-leaf plate 71 and the second loose-leaf plate 72, so that the two loose-leaf plates can rotate mutually, and after the second loose-leaf plate 72 is fixed with the H-shaped steel enclosing purlin 5, the first loose-leaf plate 71 and the second hoop batten plate 62 connected with the first loose-leaf plate 71 can rotate relatively, so that the hoop 6 has two states of opening and locking. The adoption of the steel loose-leaf 7 makes the rotation of the anchor ear 6 more convenient, and the connection mode of the anchor ear 6 is adopted, so that the connection stability between the H-shaped steel enclosing purlin 5 and the steel pipe pile can be increased.
Further, after the two semi-annular hoops are locked, the blank between the two semi-annular hoops and the steel pipe pile is filled with rubber 8, so that the stability of the steel pipe pile is further improved.
In addition, all the openings at the top of the H-shaped steel purlin 5 are sealed by adopting batten plate seal heads, so that the H-shaped steel purlin 5 is prevented from being deformed under pressure.
The embodiment 1 of the invention also discloses a construction process of the high-rigidity combined H-shaped steel sheet pile supporting structure, which comprises the following steps:
s1, selecting a steel pipe pile as a supporting body according to the purchasing difficulty of the current market materials, project characteristics and complexity of surrounding environments;
s2, after the type of the support body is determined, selecting a combination type with the integral rigidity closest to the project requirement according to the project characteristics and the allowable deformation size;
s3, according to project characteristics and allowable deformation sizes, the optimal combination pattern is accurately matched by adjusting the spacing between the front steel pipe piles, the spacing between the rear steel pipe piles and the spacing between the front steel pipe piles and the rear steel pipe piles in the selected pattern;
s4, site measurement paying-off is carried out to determine construction positioning of the Larson steel sheet pile, and meanwhile, mechanical arrival preparation is carried out;
s5, lifting the steel pipe pile to a designed position by the aid of an excavator in cooperation with a pile driving machine, centering and adjusting to ensure that the construction position is accurate, lightly hammering the steel pipe pile for a plurality of times by using a vibrating hammer, measuring and correcting the steel pipe pile, and then vibrating and sinking the steel pipe pile;
s6, sequentially constructing front and rear rows of steel pipe piles, front and rear rows of Larson steel sheet piles and Larson steel sheet piles in a beam connecting area, wherein the Larson steel sheet piles are connected with the Larson steel sheet piles and the Larson steel sheet piles are connected with the steel pipe piles by adopting hollow circular ring locks, and the overall construction sequence is as follows: firstly, constructing front steel pipe piles and Larson steel sheet piles; then constructing Larson steel sheet pile connecting beams; finally, firstly constructing a rear row of steel pipe piles, and then constructing a rear row of Larson steel sheet piles;
s7, placing the H-shaped steel purlin above the Larson steel sheet pile in the beam connecting area, pressing the H-shaped steel purlin down to reach a fixed position by using a digging machine, and pre-filling rubber at the contact position of the H-shaped steel purlin and the Larson steel sheet pile;
s8, welding the H-shaped steel purlin enclosing end socket lacing plates, and then fully welding the H-shaped steel purlin enclosing end socket lacing plates;
s9, welding a seal head plate on the upper part of the H-shaped steel enclosing purlin, and locking a steel hinge at a corresponding position by adopting a bolt;
s10, welding the steel anchor ear on a steel hinge, and pre-filling rubber at the contact position of the steel anchor ear and the steel pipe pile;
s11, adjusting the steel anchor ear to encircle the steel pipe pile until the reserved bolt holes on the front end batten plate of the steel anchor ear are aligned, and locking by using high-strength bolts after the alignment;
and S12, welding channel steel surrounding purlins between adjacent steel pipe piles for reinforcement.
As shown in fig. 1, there are several forms of support structures:
FIG. 1a is a single point support structure, wherein a rear row of piles are connected with a front row of steel pipe piles by adopting 1 steel pipe pile;
FIG. 1b is an open-type supporting structure, wherein the open-type supporting structure is formed by integrally connecting rear row piles without adopting Larson steel sheet piles;
FIG. 1c is a multi-point support structure, wherein a rear row pile is formed by a plurality of steel pipe piles (which are connected by Larson steel sheet piles), and a middle steel pipe pile is connected with a front row steel pipe pile;
FIG. 1d is a closed type supporting structure, wherein the closed type supporting structure is formed by integrally connecting rear row piles by adopting Larson steel sheet piles;
fig. 1e shows an expanded supporting structure, and more truss type combined steel sheet piles can be selected according to foundation pit requirements by expansion.
In actual construction, the combination type with the integral rigidity closest to the project requirement can be selected according to the project characteristics and the allowable deformation size.
Example 2
In example 2, H-steel was used as the support.
As shown in fig. 8-11, a strong rigidity "truss type" combined steel sheet pile supporting structure is different from the supporting structure of embodiment 1 in that H-shaped steel 3' is adopted to replace steel pipe piles as supporting bodies, and in addition, the H-shaped steel is reinforced without adopting a hoop structure, and according to the position of the H-shaped steel, a lock catch 4 is arranged at one end, two ends or the middle part of the H-shaped steel, and is connected with a lassen steel sheet pile 1 and an H-shaped steel purlin 5 through the lock catch 4 and a steel loose-leaf 7.
As shown in FIG. 9, the connecting structure of the H-shaped steel 3 'and the Larson steel sheet pile 1 is characterized in that a closed circular lock catch is arranged at one end of the H-shaped steel 3', an open circular lock catch is arranged at the corresponding Larson steel sheet pile, and the closed circular lock catch and the open circular lock catch are used for limiting and locking during construction, and novel polyurea waterproof material is injected into a grouting opening for reinforcement.
As shown in fig. 10, an H-steel purlin is arranged on the plane of the beam, wherein an H-steel purlin 5 is arranged on the outer side of a lassen steel sheet pile connecting beam 2 for strengthening the stability of connection, an H-steel lacing plate 31 'is arranged at the opening of an H-steel 3' support, and a channel steel purlin 9 is arranged between adjacent H-steel supports, so that the overall stability of the support structure is improved.
As shown in fig. 11, the H-steel purlin 5 is connected with the H-steel 3 'support body by using a steel hinge 7, and the oblique lassen steel sheet pile 1 can be effectively connected with the H-steel 3' support body due to the rotatability of the steel hinge 7.
The embodiment 2 of the invention also discloses a construction process of the high-rigidity combined H-shaped steel sheet pile supporting structure, which comprises the following steps:
s1, selecting H-shaped steel as a support body according to the purchase difficulty of the current market materials, project characteristics and complexity of surrounding environments;
s2, after the type of the support body is determined, selecting a combination type with the integral rigidity closest to the project requirement according to the project characteristics and the allowable deformation size;
s3, according to project characteristics and allowable deformation sizes, the optimal combination pattern is accurately matched by adjusting the spacing between the front steel pipe piles, the spacing between the rear steel pipe piles and the spacing between the front steel pipe piles and the rear steel pipe piles in the selected pattern;
s4, site measurement paying-off is carried out to determine construction positioning of the Larson steel sheet pile, and meanwhile, mechanical arrival preparation is carried out;
s5, lifting the H-shaped steel to a designed position by matching an excavator with a pile driver, centering and adjusting to ensure that the construction position is accurate, lightly hammering the H-shaped steel for a plurality of times by using a vibrating hammer, measuring and correcting the H-shaped steel, and then vibrating and pile sinking;
s6, sequentially constructing front and back rows of H-shaped steel, front and back rows of Larson steel sheet piles and Larson steel sheet piles in a beam connecting area, wherein the Larson steel sheet piles are connected with the Larson steel sheet piles and the Larson steel sheet piles are connected with the H-shaped steel by adopting hollow circular ring lock catches, and the whole construction sequence is as follows: firstly, constructing front row H-shaped steel and Lassen steel sheet piles; then constructing Larson steel sheet pile connecting beams; finally, firstly constructing the rear-row H-shaped steel, and then constructing the rear-row Larson steel sheet pile;
s7, placing the H-shaped steel purlin above the Larson steel sheet pile in the beam connecting area, pressing the H-shaped steel purlin down to reach a fixed position by using a digging machine, and pre-filling rubber at the contact position of the H-shaped steel purlin and the Larson steel sheet pile;
s8, welding the H-shaped steel purlin enclosing end socket lacing plates, and then fully welding the H-shaped steel purlin enclosing end socket lacing plates;
s9, welding a seal head plate on the upper part of the H-shaped steel purlin;
s10, surrounding the reserved bolt holes by using H-shaped steel, oppositely pulling by adopting steel bars or steel strands, and fixing by adopting high-strength bolts after tensioning.
S11, welding channel steel surrounding purlins between adjacent H-shaped steel for reinforcement.
As shown in fig. 8, there are several forms of support structures:
in fig. 8, 2a is a single-point supporting structure, and the single-point type pile is that a rear row pile is connected with a front row H-shaped steel by adopting 1H-shaped steel;
in FIG. 8, 2b is an open type supporting structure, and the open type is that the rear H-shaped steel is integrally connected without adopting Larson steel sheet piles;
in fig. 8, 2c is a multipoint type supporting structure, and the multipoint type supporting structure adopts a plurality of H-shaped steels (which are mutually connected by lason steel sheet piles) for the rear row piles, wherein the middle H-shaped steel is connected with the front row H-shaped steels;
in fig. 8, 2d is a closed supporting structure, and the closed type is that rear row H-shaped steel is integrally connected by Larson steel sheet piles;
in fig. 8, 2e is an expanded supporting structure, and more truss-type combined H-section steel can be selected according to foundation pit requirements in an expanded manner.
In actual construction, the combination type with the integral rigidity closest to the project requirement can be selected according to the project characteristics and the allowable deformation size.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. A strong rigidity "truss-like" combination steel sheet pile supporting construction, its characterized in that includes: n rows of supporting bodies are arranged outside the foundation pit enclosure sideline pit, a plurality of Larson steel sheet piles are arranged between the adjacent supporting bodies, and equilateral triangle arrangement is formed between two adjacent supporting bodies of the N rows and the supporting bodies at the corresponding positions of the N+1 rows;
the Larson steel sheet piles are connected with the supporting bodies through lock catches, H-shaped steel purlins are respectively arranged on two side surfaces of each group of Larson steel sheet piles, and the H-shaped steel purlins are connected with the supporting bodies through steel loose-leaf joints;
the lock catch comprises: the first locking notch connecting piece is connected with the Larson steel sheet pile, the cross section of which is in an open circular shape, and the second locking notch connecting piece is connected with the support body, the cross section of which is in a circular shape, wherein the inner diameter of the first locking notch connecting piece is slightly larger than the outer diameter of the second locking notch connecting piece, and when the locking notch connecting piece is used, the first locking notch connecting piece is inserted into the periphery of the second locking notch connecting piece.
2. The high-rigidity truss type combined steel sheet pile supporting structure according to claim 1, wherein the supporting body is made of steel pipe piles or H-shaped steel.
3. The high-rigidity truss type combined steel sheet pile supporting structure according to claim 1, wherein a grouting opening is formed in the middle of the second locking port connecting piece.
4. A strong rigidity "truss type" composite steel sheet pile supporting structure as described in claim 3 wherein said grouting openings are capable of being filled with a novel polyurea waterproof material.
5. The high-rigidity truss type combined steel sheet pile supporting structure according to claim 1, wherein rubber is adopted between the outer end face of the Larson steel sheet pile and the H-steel enclosing purlin for filling.
6. A strong stiffness "truss" composite steel sheet pile support structure as defined in claim 1 wherein a hoop is provided between the steel hinge and the support body.
7. A strong stiffness "truss" composite steel sheet pile support structure of claim 5 wherein rubber packing is employed between the anchor ear and support body.
8. The high-rigidity truss type combined steel sheet pile supporting structure according to claim 1, wherein a batten plate sealing head is arranged at the top of the H-shaped steel enclosing purlin.
9. The high-rigidity truss-type combined steel sheet pile supporting structure according to claim 1, wherein channel steel enclosing purlins are also arranged between adjacent supporting bodies.
10. A construction process for a Jiang Gangdu truss type combined steel sheet pile supporting structure according to any one of claims 1 to 9, comprising the steps of:
s1, selecting the type of a support body according to the purchase difficulty level, project characteristics and complexity level of surrounding environment of the current market materials;
s2, after the type of the support body is determined, selecting a combination type with the integral rigidity closest to the project requirement according to the project characteristics and the allowable deformation size;
s3, according to project characteristics and allowable deformation sizes, the optimal combination pattern is precisely matched by adjusting the spacing between front row supports, the spacing between rear row supports and the size of front row and rear row spacing in the selected pattern;
s4, site measurement paying-off is carried out to determine construction positioning of the Larson steel sheet pile, and meanwhile, mechanical arrival preparation is carried out;
s5, conveying the lifting support body to a designed position by matching with a pile driving machine by using an excavator, centering and adjusting to ensure that the construction position is accurate, lightly hammering the pile to a plurality of times by using a vibrating hammer, measuring and correcting the pile, and then vibrating and pile sinking;
s6, sequentially constructing front and rear rows of support bodies, front and rear rows of Larson steel sheet piles and Larson steel sheet piles in a beam connecting area, wherein the Larson steel sheet piles are connected with the Larson steel sheet piles and the support bodies by adopting hollow circular ring lock catches, and the whole construction sequence is as follows: constructing front row supporting bodies and Larson steel sheet piles; then constructing Larson steel sheet pile connecting beams; finally, constructing a rear row of supporting bodies, and then constructing rear row of Larson steel sheet piles;
s7, placing the H-shaped steel purlin above the Larson steel sheet pile in the beam connecting area, pressing the H-shaped steel purlin down to reach a fixed position by using a digging machine, and pre-filling rubber at the contact position of the H-shaped steel purlin and the Larson steel sheet pile;
s8, welding the H-shaped steel purlin enclosing end socket lacing plates, and then fully welding the H-shaped steel purlin enclosing end socket lacing plates;
s9, welding a seal head plate on the upper part of the H-shaped steel enclosing purlin, and locking a steel hinge at a corresponding position by adopting a bolt;
s10, welding the steel anchor ear on the steel hinge, and pre-filling rubber at the contact position of the steel anchor ear and the supporting body;
s11, adjusting the steel anchor ear to encircle the support body until the reserved bolt holes on the front end lacing plate of the steel anchor ear are aligned, and locking by using high-strength bolts after alignment;
s12, welding channel steel surrounding purlins between adjacent supporting bodies for reinforcement.
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| CN102900089A (en) * | 2012-10-31 | 2013-01-30 | 东南大学 | Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft |
| US20150354163A1 (en) * | 2000-07-28 | 2015-12-10 | Pnd Engineers, Inc. | Earth retaining system such as a sheet pile wall with integral soil anchors |
| CN109797755A (en) * | 2019-03-20 | 2019-05-24 | 安徽省第二建筑工程有限公司 | The steel pipe Larsen steel sheet pile enclosure structure and its construction method of Elements of Space Grid Truss support |
| CN109881627A (en) * | 2019-03-21 | 2019-06-14 | 上海勘测设计研究院有限公司 | Medicining wave structure and its installation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150354163A1 (en) * | 2000-07-28 | 2015-12-10 | Pnd Engineers, Inc. | Earth retaining system such as a sheet pile wall with integral soil anchors |
| CN102900089A (en) * | 2012-10-31 | 2013-01-30 | 东南大学 | Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft |
| CN109797755A (en) * | 2019-03-20 | 2019-05-24 | 安徽省第二建筑工程有限公司 | The steel pipe Larsen steel sheet pile enclosure structure and its construction method of Elements of Space Grid Truss support |
| CN109881627A (en) * | 2019-03-21 | 2019-06-14 | 上海勘测设计研究院有限公司 | Medicining wave structure and its installation method |
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