CN217150258U - HZ type foundation pit retaining structure who combines prestressed anchorage cable - Google Patents

HZ type foundation pit retaining structure who combines prestressed anchorage cable Download PDF

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CN217150258U
CN217150258U CN202121438721.2U CN202121438721U CN217150258U CN 217150258 U CN217150258 U CN 217150258U CN 202121438721 U CN202121438721 U CN 202121438721U CN 217150258 U CN217150258 U CN 217150258U
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shaped steel
steel plate
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pile box
foundation pit
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张一鸣
李方舰
周玉石
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Hebei University of Technology
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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    • Y02W30/30—Landfill technologies aiming to mitigate methane emissions

Abstract

The utility model relates to a combine HZ type foundation ditch envelope of prestressed anchorage cable, this envelope include Z shaped steel stake case type structure, H shaped steel, angle steel, collar tie beam and anchor rope. The Z-shaped steel plate pile box structure consists of four Z-shaped steel plate piles. The H-shaped steel is connected with the Z-shaped steel plate pile box structure through angle steel. The H-shaped steel and Z-shaped steel plate pile box structure is inserted into a natural soil layer and is perpendicular to the ring beam. The anchor cable is anchored and tensioned at the top of the ring beam. The utility model provides an envelope has fender soil and stagnant water function concurrently, can the effective control foundation ditch warp, has that rigidity is big, the time limit for a project is short, the cost is low, bearing capacity is strong characteristics.

Description

HZ type foundation pit retaining structure who combines prestressed anchorage cable
Technical Field
The utility model belongs to the technical field of foundation ditch engineering, concretely relates to HZ type foundation ditch retaining structure who combines prestressed anchorage cable.
Background
With the continuous promotion of urban underground space construction in recent years, deep foundation pit engineering is increasing day by day. At present, the commonly used foundation pit enclosure forms mainly include gravity type cement soil mixing piles, SMW construction method piles, cast-in-situ bored piles, reinforced concrete sheet piles, underground continuous walls and other processes. The traditional process has long construction period and high construction cost, and the foundation pit engineering as a temporary structure cannot be recycled, thereby causing a great deal of waste of resources.
Based on the method, the steel structure foundation pit enclosure system is produced at the same time. The Z-shaped steel plate pile has the advantages of convenience and quickness in construction, recyclability, good waterproof performance and the like, but has small lateral rigidity and is less used independently in engineering projects with high requirements on the surrounding environment; h shaped steel has advantages such as the dead weight is light, lateral rigidity is big, construction speed is fast, nevertheless can only play the effect of retaining soil when the foundation ditch excavation, often need execute during the design construction and beat the waterproof curtain. The recyclable prestressed anchor cable can ensure the strength of the enclosure structure, is green and environment-friendly, has small influence on underground space, and meets the requirements of the sustainable development of the society at present. In the existing foundation pit enclosure mode, an enclosure system capable of combining the characteristics of Z-shaped steel plate piles, H-shaped steel and prestressed anchor cables is lacked, which is an important current research subject.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model aims at providing a HZ type foundation ditch retaining structure who combines prestressed anchorage cable. The enclosure structure has the advantages that the Z-shaped steel plate pile box structure, the H-shaped steel, the angle steel, the ring beam and the anchor cable are arranged, the advantages of the Z-shaped steel plate pile, the H-shaped steel and the prestressed anchor cable can be combined, the enclosure structure has the functions of soil retaining and water stopping, and the characteristics of high rigidity, recyclability, short construction period and high bearing capacity of the enclosure structure are realized.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an HZ type foundation pit support structure combined with a prestressed anchor cable comprises a Z type steel sheet pile, H type steel, a ring beam and an anchor cable; the method is characterized in that four Z-shaped steel plate piles form a hexagonal prism-shaped Z-shaped steel plate pile box structure, and the Z-shaped steel plate pile box structure consists of four Z-shaped steel plate piles; the Z-shaped steel plate pile box-type structures are manually arranged along the circumferential direction of the foundation pit, H-shaped steel is fixedly inserted into each Z-shaped steel plate pile box-type structure in an inserting mode, the H-shaped steel is perpendicular to the circumferential direction of the foundation pit, and wing plates at two ends of the H-shaped steel are tightly attached to the inner side surfaces of two Z-shaped steel plate piles in the Z-shaped steel plate pile box-type structures; the H-shaped steel and Z-shaped steel plate pile box structure is inserted into a natural soil layer and is perpendicular to the ring beam; the anchor cable is anchored at the top of the ring beam through an anchorage device.
The axis of the Z-shaped steel plate pile box structure is a connecting line of a plurality of Z-shaped steel plate pile box structure hand-handers, and two Z-shaped steel plate piles on the lower side of the axis are welded and spliced with two Z-shaped steel plate piles on the upper side of the axis to form the Z-shaped steel plate pile box structure after a lock catch is cut off respectively.
The Z-shaped steel plate pile box structure is connected with the adjacent Z-shaped steel plate pile box structure through the lock catch.
The number ratio of the Z-shaped steel plate pile box structure to the H-shaped steel to the anchor cable is 1:1:1, and the anchor cable and the Z-shaped steel plate pile box structure are arranged at intervals.
At least one group of angle steel is welded on the inner wall of the Z-shaped steel plate pile box structure along the height direction according to the size of the H-shaped steel, the sinking verticality of the H-shaped steel can be controlled by the arrangement of the angle steel, and the distance between two angle steels in the group of angle steel is matched with the width of a wing plate of the H-shaped steel.
Before the construction of the H-shaped steel, dirt and rust on the surface need to be removed, and the friction reducer is coated immediately. The purpose of removing rust and the antifriction agent is to reduce the friction force between the H-shaped steel and the Z-shaped steel sheet pile and the soil body, so that the subsequent H-shaped steel can be conveniently pulled out and reused.
The height of the H-shaped steel pile position is 500mm higher than that of the ring beam and the Z-shaped steel plate pile box-type structure pile position, and the H-shaped steel is convenient to pull out subsequently.
An anchor cable mounting sleeve hole needs to be reserved in the ring beam, the sleeve is similar to a sleeve, a steel strand of the anchor cable penetrates through the ring beam and is fixed by an anchorage device, and the anchor cable is connected with the ring beam, the H-shaped steel and the Z-shaped steel plate pile box structure into a whole through the mounting sleeve hole.
The anchor cable comprises a free section and an anchoring section, wherein the anchoring section needs to be grouted to form grouting body.
And applying prestress to the anchor cable by stretching the free section of the anchor cable after the ring beam reaches the design strength. In the application, the anchor cable can be vertically arranged or obliquely arranged (see fig. 2 and 4), and is suitable for a vertical anchor form in occasions with higher requirements on red lines, limited sites and high environmental requirements; the oblique anchor form can provide oblique lateral force, can save bearing structure, makes things convenient for the interior construction of foundation ditch more. The inclination angle of the inclined anchor is set to be 30-45 degrees.
The utility model also provides a method for using of HZ type foundation ditch retaining structure who combines prestressed anchorage cable, the construction steps of this method are:
(1) determining the types, lengths, positions and intervals of the Z-shaped steel sheet piles, the H-shaped steel and the anchor cables according to the engineering scale of the foundation pit, the surrounding environmental conditions and the hydrogeological conditions;
(2) leveling a construction site, and hoisting a Z-shaped steel plate pile box structure and H-shaped steel to a designed elevation by using modes of vibration pile sinking or static pile pressing and the like;
(3) constructing an anchor cable after the pile sealing of the foundation pit is finished, constructing a ring beam after the grouting of the anchor cable is finished, and reserving an installation sleeve hole of the anchor cable in the ring beam;
(4) after the strength of the ring beam reaches the design requirement, tensioning the prestress through an anchorage device so as to enable the anchor cable, the ring beam, the H-shaped steel and the Z-shaped steel plate pile box structure to form an integrated structure;
(5) excavating a soil body in the foundation pit, constructing a cushion layer, a bottom plate and a force transmission belt;
(6) and after the bottom plate and the force transmission belt reach the strength, backfilling after the underground structure is constructed to +/-0.00, and recovering the anchor cables, the H-shaped steel and the Z-shaped steel plate pile box structure.
The utility model adopts the above technical scheme, compare with prior art and have following advantage:
the utility model discloses the advantage of Z shaped steel pile H shaped steel and prestressed anchorage cable has been combined, the big characteristic of H shaped steel lateral rigidity has not only been kept, make the design excavation degree of depth effectively increase, and adopt Z shaped steel pile boxed structure, make foundation ditch enclosure have the effect of retaining soil and stagnant water concurrently, adopt recoverable prestressed anchorage cable simultaneously, it is big to have realized enclosure rigidity, can circulate, the time limit for a project is short, advantage that bearing capacity is strong, it is less to have avoided prior art to use to support the lateral rigidity that Z shaped steel pile formed H, Z combination enclosure by H shaped steel pile unilateral and brought, only support lateral soil and water pressure by H shaped steel in the foundation ditch excavation process, Z shaped steel pile only plays the not enough of stagnant water curtain effect.
The utility model discloses well Z shaped steel stake box structure is the box, very big improvement Z shaped steel stake's section modulus, cooperation H shaped steel can be applied to in the dark big foundation ditch excavation engineering. Simultaneously the utility model discloses also add recoverable prestressed anchorage cable, can guarantee supporting construction's intensity, the foundation ditch is inside simultaneously can not set up any support, makes things convenient for the inside construction of foundation ditch more, improves the efficiency of construction.
To sum up, the utility model provides an envelope has fender soil and stagnant water function concurrently, can the effective control foundation ditch warp, has characteristics such as rigidity is big, the time limit for a project is short, the cost is low, bearing capacity is strong.
Drawings
FIG. 1 is a cross-sectional view of a foundation pit support structure incorporating an oblique anchor;
FIG. 2 is a longitudinal sectional view of a foundation pit support structure combined with an oblique anchor along a lock catch between two adjacent box-type structures;
FIG. 3 is a plan view of a foundation pit support structure incorporating vertical anchors;
FIG. 4 is a longitudinal cross-sectional view of a foundation pit support structure combined with vertical anchors along a lock catch between two adjacent box-type structures;
in the figure, 1 is a ring beam; 2 is a Z-shaped steel plate pile box structure; 3 is H-shaped steel; 4 is angle steel; 5 is a Z-shaped steel sheet pile; 6 is an anchor cable; 7 is a cushion layer; 8 is a bottom plate; 9 is a force transmission belt; 10 is a lock catch; and 11 is an anchorage device.
Detailed Description
The present invention will be further explained with reference to the drawings and examples. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The foundation pit engineering is used as a temporary structure, and the abandonment can be removed after the underground engineering construction is finished. Therefore, the steel plate pile has the advantages of the Z-shaped steel plate pile, the H-shaped steel and the prestressed anchor cableAnd (4) point fusion. The Z-shaped steel plate pile is prefabricated into a box-shaped structure, and the section modulus of the Z-shaped steel plate pile can reach 3086-12741 cm 3 The modulus of the section of the Z-shaped steel sheet pile is only 1200-5015 cm 3 The utility model discloses a more dark foundation ditch excavation engineering can be applicable to the utility model discloses can promote envelope's lateral rigidity greatly under the same condition, make with the combination of H shaped steel. The prestressed anchor cables are combined, so that the lateral rigidity of the enclosure structure is further increased, an inner support does not need to be arranged inside the foundation pit, the underground structure is convenient to construct, and the construction period is effectively shortened.
The utility model relates to a novel structural style of foundation ditch enclosure creatively lies in prefabricating Z shaped steel stake for box structure, combines to form one kind with H shaped steel and has the novel foundation ditch enclosure form who keeps off native and stagnant water effect concurrently. Compared with the prior H, Z type steel sheet pile enclosure structure, the section modulus of the steel sheet pile enclosure structure is more advantageous, and the steel sheet pile enclosure structure can be suitable for deeper foundation pit excavation engineering;
the H-shaped steel, the Z-shaped steel sheet pile and the anchor cable can be recycled, the construction cost is low, the construction period is short, the influence on the adjacent underground space is small, and the requirements of sustainable development are met.
Examples
Referring to the attached drawing 1, the HZ type foundation pit support structure combined with the prestressed anchor cables comprises a Z type steel plate pile box type structure 2, H type steel 3, angle steel 4, a ring beam 1 and anchor cables 6; the Z-shaped steel plate pile box-shaped structure 2 is composed of four Z-shaped steel plate piles 5, two ends of each Z-shaped steel plate pile 5 are provided with a lock catch, two adjacent Z-shaped steel plate piles 5 are connected through the lock catches 10, the two Z-shaped steel plate piles 5 on the lower side of the axis are welded and spliced with the two piles on the upper side of the axis after one lock catch 10 is cut off from each Z-shaped steel plate pile 5, and the Z-shaped steel plate pile box-shaped structure 2 is integrally hexagonal prism-shaped; the number ratio of the Z-shaped steel plate pile box-shaped structures to the H-shaped steel to the anchor cables is 1:1:1, the anchor cables are arranged between the adjacent Z-shaped steel plate pile box-shaped structures, and the supporting structures can be omitted by considering that the soil pressure is in triangular distribution. The H-shaped steel 3 is connected with the Z-shaped steel plate pile box-shaped structures 2 through angle steel 4, H-shaped steel is arranged inside each Z-shaped steel plate pile box-shaped structure 2, and wing plates at two ends of the H-shaped steel are fixed to the centers of the inner side surfaces of the two Z-shaped steel plate piles which are connected together through lock catches; the H-shaped steel 3 and the Z-shaped steel plate pile box structure 2 are inserted into a natural soil layer and are perpendicular to the ring beam 1; the anchor cable 6 is anchored to the top of the ring beam 1 by an anchor 12.
The utility model relates to a combine HZ type foundation ditch retaining structure of prestressed anchorage cable, its work progress concrete step is:
(1) determining the types, lengths, positions and intervals of a Z-shaped steel plate pile box structure 2, H-shaped steel 3 and anchor cables 6 according to the engineering scale of the foundation pit, the surrounding environmental conditions and the hydrogeological conditions;
(2) leveling a construction site, lifting the Z-shaped steel plate pile box-type structure 2 and the H-shaped steel 3 by using modes such as vibration pile sinking or static pile pressing and the like to a designed elevation, and fixing the H-shaped steel 3 with the Z-shaped steel plate pile box-type structure 2 through angle steel 4;
(3) continuously hoisting and constructing a next Z-shaped steel plate pile box structure 2 and H-shaped steel 3 along the circumferential direction of the foundation pit according to the step (2), connecting the Z-shaped steel plate pile box structure 2 constructed by construction and the Z-shaped steel plate pile box structure 2 constructed by construction in the previous step together through a lock catch, and circulating the process to the foundation pit for pile sealing, namely arranging a circle of Z-shaped steel plate pile box structure 2+ H-shaped steel 3 modular structure in the circumferential direction of the foundation pit, connecting the heads and the tails, constructing an anchor rope 6 after the pile sealing is finished, constructing the anchor rope 6 on the inner side of the foundation pit and not intersecting the Z-shaped steel plate pile box structure 2, constructing a ring beam 1 after the anchor rope is completely grouted, and reserving an installation trepanning of the anchor rope in the ring beam 1;
(4) after the strength of the ring beam 1 reaches the design requirement, tensioning the prestress through an anchorage device 11 so as to enable the anchor cable 6, the ring beam 1, the Z-shaped steel plate pile box structure 2 and the H-shaped steel 3 to form an integrated structure;
(5) excavating a soil body in a foundation pit, constructing a cushion layer 7, a bottom plate 8 and a force transmission belt 9;
(6) and after the bottom plate 8 and the force transmission belt 9 reach the strength, constructing the underground structure to +/-0.00, backfilling, recovering the anchor cables 6, the H-shaped steel 3 and the Z-shaped steel plate pile box-type structure 2, breaking the ring beam during recovery, and dragging the part with the height of the H-shaped steel, so that the H-shaped steel is pulled out from the Z-shaped steel plate pile box-type structure for recovery.
Construction example:
in this embodiment, a commercial square project is taken as an example, and the excavation depth of the foundation pit is10.2m, the perimeter of the foundation pit is about 373m, and the excavation area is about 10555m 2 And comprehensively determining the safety level of the engineering side wall of the foundation pit to be one grade according to the surrounding environment requirement of the engineering, the engineering geology, the hydrogeology condition and the excavation depth of the foundation pit.
The soil layer information is as follows:
Figure BDA0003135137250000041
the bottom of the foundation pit is positioned in the silt layer. Wherein γ is the gravity; c. phi is respectively the cohesive force and the internal friction angle of the soil layer consolidation and quick shearing.
The embodiment adopts the HZ type envelope who combines the prestressed anchorage cable to support the major structure side wall, and wherein, H shaped steel adopts 18mH 800X 300X 14X 26 type, and Z shaped steel sheet pile adopts 18mWRZ30-635 type, and the angle steel adopts L50X 6 equilateral angle steel, and two angle steels are a set of, and two angle steels are the same height setting, and the space of two parcels can hold the pterygoid lamina of H shaped steel just, restriction H shaped steel straightness that hangs down that sinks. Several groups of angle steels can be arranged in the height direction of the inner wall of the Z-shaped steel plate pile, so that the perpendicularity of the H-shaped steel is guaranteed, and the horizontal coordinates of the multiple groups of angle steels on one side are the same. The anchor cable adopts 21m 3 phi S15.2 steel strands, the inclination angle is 30 degrees, the diameter of a formed hole is phi 400mm, the length of the anchored segment is 12m, the length of the free segment is 9m, and the pre-applied axial force is 80.00 kN/m. The construction cost is about 360 thousands, and the construction period is four months; compared with the enclosure form (the construction cost is about 500 ten thousand, the construction period is seven months) of the traditional technology cast-in-place pile and the water stop pile combined with two inner supports, the construction cost is saved by about 30%, and the construction period is saved by three months. The concrete construction steps are as follows:
step 1, carrying out incoming inspection and acceptance on Z-shaped steel sheet piles, H-shaped steel, angle steel and anchor cables, welding the Z-shaped steel sheet piles into Z-shaped steel sheet pile box structures on a construction site according to design requirements, and welding the angle steel to the Z-shaped steel sheet pile box structures according to the size of the H-shaped steel;
step 2, leveling a construction site, driving a Z-shaped steel plate pile box structure to a designed elevation, controlling sinking verticality, and connecting two adjacent Z-shaped steel plate pile box structures through a lock catch in the driving process;
step 3, driving the H-shaped steel plate pile to a designed elevation within 1 day after the construction of the Z-shaped steel plate pile is finished, and controlling the sinking verticality of the H-shaped steel plate pile by pre-welding angle steel;
step 4, adopting a drilling machine to beat a prestressed anchor cable and grouting at the anchoring section of the prestressed anchor cable, paying attention to control the drilling angle and the grouting length, and reserving an installation sleeve hole at the ring beam position;
step 5, constructing ring beams along the periphery of the foundation pit so that the Z-shaped steel plate pile box structure, the H-shaped steel and the top end of the anchor cable form an integrated structure;
step 6, after the ring beam reaches the strength, tensioning the anchor cable to the designed strength;
step 7, after the prestress value of the anchor cable is stable, excavating a soil body in the pit, constructing a cushion layer, a bottom plate and a force transmission belt;
and 8, after the bottom plate and the force transmission belt reach the strength, backfilling after the underground structure is constructed to +/-0.00, and recovering the anchor cable, the H-shaped steel and the Z-shaped steel plate pile box structure.
The utility model discloses the part not mentioned is applicable to prior art.

Claims (8)

1. An HZ type foundation pit support structure combined with a prestressed anchor cable comprises a Z type steel sheet pile, H type steel, a ring beam and an anchor cable; the method is characterized in that four Z-shaped steel plate piles form a hexagonal prism-shaped Z-shaped steel plate pile box structure, and the Z-shaped steel plate pile box structure consists of four Z-shaped steel plate piles; the Z-shaped steel plate pile box-type structures are manually arranged along the circumferential direction of the foundation pit, H-shaped steel is fixedly inserted into each Z-shaped steel plate pile box-type structure in an inserting mode, the H-shaped steel is perpendicular to the circumferential direction of the foundation pit, and wing plates at two ends of the H-shaped steel are tightly attached to the inner side surfaces of two Z-shaped steel plate piles in the Z-shaped steel plate pile box-type structures; the H-shaped steel and Z-shaped steel plate pile box structure is inserted into a natural soil layer and is perpendicular to the ring beam; the anchor cable is anchored at the top of the ring beam through an anchorage device.
2. The HZ type foundation pit support structure combined with the prestressed anchor cable of claim 1, wherein the axis of the Z type steel plate pile box structure is a connecting line of a plurality of Z type steel plate pile box structure hand-handgrips, and two Z type steel plate piles at the lower side of the axis are welded and spliced with two Z type steel plate piles at the upper side of the axis to form a Z type steel plate pile box structure after a lock catch is cut off.
3. The HZ type foundation pit enclosure structure combined with the prestressed anchor cables of claim 1, wherein the Z type steel sheet pile box type structure is connected with the adjacent Z type steel sheet pile box type structure through a lock catch.
4. The HZ foundation pit support structure combined with the prestressed anchor cables as claimed in claim 1, wherein the number ratio of the Z-shaped steel plate pile box structure to the H-shaped steel to the anchor cables is 1:1:1, and the anchor cables are arranged at intervals with the Z-shaped steel plate pile box structure.
5. The HZ foundation pit support structure combined with the prestressed anchor cables as claimed in claim 1, wherein at least one set of angle steels are welded on the inner wall of the Z-shaped steel sheet pile box structure along the height direction according to the size of the H-shaped steel, the angle steels are arranged to control the sinking verticality of the H-shaped steel, and the distance between two angle steels in one set of angle steels is matched with the width of the wing plate of the H-shaped steel.
6. The HZ type foundation pit support structure combined with the prestressed anchor cable according to claim 1, wherein before the construction of the H-shaped steel, dirt and rust on the surface need to be removed, and a friction reducer is coated immediately; the height of the H-shaped steel pile is 500mm higher than that of the ring beam and the Z-shaped steel plate pile box structure.
7. The HZ foundation pit support structure combined with the prestressed anchor cables as claimed in claim 1, wherein an anchor cable installation sleeve hole is reserved in the ring beam, the anchor cable is connected with the ring beam, the H-shaped steel and the Z-shaped steel plate pile box type structure into a whole through the installation sleeve hole, the anchor cable comprises a free section and an anchoring section, and the anchoring section is grouted to form grouting body; and applying prestress to the anchor cable by stretching the free section of the anchor cable after the ring beam reaches the design strength.
8. The HZ type foundation pit support structure combined with the prestressed anchor cables as claimed in claim 1, wherein the anchor cables are oblique anchors or vertical anchors, and the inclination angle of the oblique anchors is 30-45 °.
CN202121438721.2U 2021-06-28 2021-06-28 HZ type foundation pit retaining structure who combines prestressed anchorage cable Active CN217150258U (en)

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