CN220013783U - Inclined pile type prestress anti-floating anchor cable construction structure - Google Patents

Abstract

The utility model discloses a construction structure of a diagonal pile type prestress anti-floating anchor rope, which comprises a structural bottom plate and an anchor hole at the lower part of the structural bottom plate, wherein anchor bodies are arranged in the anchor hole, the anchor bodies are obliquely arranged, anchor ropes are arranged in the anchor bodies, anchor backing plates are arranged on the structural bottom plate, the upper ends of the anchor ropes penetrate through the structural bottom plate and are fixed on the anchor backing plates through anchorage devices, each anchor body comprises an upper free section and a lower anchor section, and the free section and the anchor section are both positioned in the anchor hole. The utility model has the beneficial effects that: the effective structure for the anti-floating reinforcement of the existing basement can meet the anti-floating requirement of a building foundation, is convenient and efficient to construct, can finish construction operation in the limited space of the existing basement, and can also ensure the waterproof effect after construction.

Description

Inclined pile type prestress anti-floating anchor cable construction structure

Technical Field

The utility model belongs to the technical field of foundation engineering, and particularly relates to a construction structure of a pre-stressed anti-floating anchor cable of an existing building foundation.

Background

With the deep advancement of brand new concepts of 'park cities' and new ways of urban development and the improvement of urban residents on the quality requirements of living environments, the improvement of dangerous old buildings in central urban areas has become one of the most important contents of urban updating. In this way, the upper structure of the dangerous old building is usually removed and changed into greening or public spaces such as parks and squares, and the basement area is reserved and changed into parking lots, so that urban green space can be effectively increased, the existing underground space is fully utilized, the parking problem of the central urban area is relieved, and the method is an effective scheme for comprehensively improving the life quality of the city.

However, the existing upper structure is removed to greatly reduce the upper load, the dead weight of the residual basement structure and the existing anti-floating engineering measures are insufficient to resist the floating force of groundwater, and in order to prevent the basement from floating after transformation, anti-floating reinforcement measures are added on the bottom plate of the existing basement to meet the anti-floating requirement of the building foundation.

Currently, the commonly used anti-floating measures mainly comprise anti-floating anchors (cables), anti-floating piles and a combination form of the anti-floating anchors and the anti-floating piles, which are collectively called an anti-floating structure. In a planar arrangement, the anti-floating structure is anchored to the basement floor, typically perpendicular to the plane of the foundation, at equidistant intervals, so as to connect the building foundation with the ground mass, providing the subsurface structure with resistance to floating up by friction between the anchor and the mass. For a deep coverage layer field, under the condition of poor mechanical property and large uplift force of a foundation rock-soil body, the whole anti-floating bearing capacity can be improved only by increasing the length of an anchoring section or increasing the number of anti-floating structures in order to improve the anti-pulling bearing capacity of a single-hole anchoring body. The design and construction methods of the anti-floating structures are widely operated in new projects, and accumulate rich experience to obtain good anti-floating effects.

The newly-built building is used for finishing the construction of the anti-floating structure in the foundation pit, the working space such as deep drilling, long anchor rods and the like is basically unlimited, and the single Kong Kangba bearing capacity of the anti-floating structure can be easily improved by increasing the length of the anchoring section. However, the existing basement is added with an anti-floating structure, the construction operation space of the existing basement is very limited (the layer height of the existing basement is generally smaller than 4.0 m), the deep hole drilling machine has no operation space at all, and the long anchor rod cannot enter holes, so that larger tensile bearing capacity cannot be obtained by increasing the length of the anchor body. On the other hand, the increase of the number of the anti-floating structures not only can cause larger disturbance to the foundation rock-soil mass and reduce the bearing capacity, but also can obviously improve the anti-floating engineering cost.

Therefore, it is necessary to provide an anti-floating reinforcement structure and a construction method thereof for special working environments of the existing basement, so that the anti-floating bearing capacity is improved, meanwhile, the quick and efficient construction is realized, and the construction cost is reduced.

Disclosure of Invention

The utility model aims at: the construction structure solves the problem that deep drilling and long anchor rod construction cannot be realized in the existing basement.

The aim of the utility model is achieved by the following technical scheme:

the utility model provides an anti anchor rope construction structures that floats of inclined pile formula prestressing force, includes the anchor eye of structure bottom plate and structure bottom plate lower part, the anchor body that is equipped with in the anchor eye, the anchor body is the slope and arranges, is equipped with the anchor rope in the anchor body, is equipped with the anchor backing plate on the structure bottom plate, and the upper end of anchor rope passes the structure bottom plate and fixes on the anchor backing plate through the ground tackle, and the anchor body includes the free section of upper portion and the anchor section of lower part, and free section and anchor section all are located the anchor eye.

Further, the anchoring bodies are three groups, and three anchoring bodies in each group form a triangular pyramid structure.

Further, the inclination angle between the anchors and the vertical line is 5-15 degrees, and the projection of two adjacent anchors in each group of anchors on the horizontal plane forms an included angle of 120 degrees.

Further, the upper layer of structure bottom plate be equipped with the hydrophobic board, the upper layer of hydrophobic board is equipped with the fiber concrete layer, is equipped with the reinforcing bar net in the fiber concrete layer.

Further, the lower end face of the anchor backing plate is provided with a water stop bar, the water stop bar is positioned in an opening of the structural bottom plate and embedded into concrete, and the anchor backing plate is fixed on the structural bottom plate through a connecting layer.

Further, the anchor backing plate, the anchor device and the anchor cable are connected into a whole through the filling block.

Further, the anchor cable in the free section is sleeved with a corrugated pipe.

Further, a plurality of wire-setting rings and tightening rings are arranged between the anchor cables in the anchoring section, the tightening rings are positioned between two adjacent wire-setting rings, and the diameter of the tightening rings is smaller than that of the wire-setting rings.

Further, a guide cap is arranged between the end parts of the anchor cable in the anchoring section.

Furthermore, the anchor cable in the anchoring section is provided with a centering bracket which is in supporting contact with the inner wall of the anchor hole.

Further, a sediment section is reserved between the anchoring body and the bottom of the anchor hole.

The utility model has the beneficial effects that: the effective structure for the anti-floating reinforcement of the existing basement can meet the anti-floating requirement of a building foundation, is convenient and efficient to construct, can finish construction operation in the limited space of the existing basement, and can also ensure the waterproof effect after construction.

The foregoing inventive subject matter and various further alternatives thereof may be freely combined to form a plurality of alternatives, all of which are employable and claimed herein; and the utility model may be freely combined between choices (of non-conflicting choices) and with other choices as well. Various combinations will be apparent to those skilled in the art from a review of the present disclosure, and are not intended to be exhaustive or to limit the utility model to the precise forms disclosed.

Drawings

Fig. 1 is a schematic view of the external structure of the present utility model.

Fig. 2 is a schematic view of the internal structure of the present utility model.

Fig. 3 is a partial enlarged view of fig. 2.

Fig. 4 is a front view of the arrangement of the present utility model.

Fig. 5 is a top view of the inventive arrangement.

In the figure: 1-structural bottom plate, 2-anchor backing plate, 3-anchorage device, 4-anchor rope, 5-free section, 6-anchor section, 7-hydrophobic plate, 8-fiber concrete layer, 9-water stop bar, 10-filling and filling block, 11-corrugated pipe, 12-wire loop, 13-tightening hoop, 14-guide cap, 15-centering support, 16-anchor hole, 17-sediment section and 18-steel bar net.

Detailed Description

The utility model will be further described with reference to specific examples and figures.

Referring to fig. 1 to 5, a construction structure of a diagonal pile type prestress anti-floating anchor cable comprises a prestress anchor cable with three holes at a certain angle in space, and is anchored on a basement bottom plate. The concrete foundation slab comprises a structural bottom plate 1, an anchor backing plate 2, an anchor 3, an anchor rope 4, a free section 5, an anchor section 6, a hydrophobic plate 7, a fiber concrete layer 8, a water stop strip 9, a filling block 10, a corrugated pipe 11, a wire-lifting ring 12, a fastening ring 13, a guide cap 14, a centering bracket 15, an anchor hole 16, a sediment section 17 and a reinforcing steel bar net 18.

The structural bottom plate 1 is an existing basement floor bottom plate structure, an anchor hole 16 is formed in the lower portion of the structural bottom plate 1, and an open pore structure corresponding to the anchor hole 16 is formed in the structural bottom plate 1. The vertical inclination angle of the drilled holes of the anchor holes 16 is preferably smaller than 15 degrees, the holes are timely cleared after the holes are formed, and after the holes are cleared, the manufactured anchor cable 4 (steel strand) is put into the holes, the holes are required to be reduced to the designed depth, and the error is not more than 10cm.

The anchor hole 16 is internally provided with an anchor body which is a reinforced concrete structure and is used for anchoring in the anchor hole 16 to provide pulling and floating resistant acting force. The anchoring bodies are obliquely arranged, and the inclination angle between the anchoring bodies and the vertical line is 5-15 degrees, preferably about 10 degrees. By the inclined arrangement of the anchors, the anchoring effect of the individual anchors is enhanced.

The three anchors are in one group, three anchors in each group form a triangular pyramid structure, and two adjacent anchors in each group form an included angle of 120 degrees in the horizontal plane projection, so that the three anchors in each group are at one anchoring position to form a three-dimensional and multi-azimuth anchoring effect.

The anchor body is internally provided with a plurality of anchor ropes 4 which are arranged along the axis direction, the lower end of each anchor rope 4 is positioned in the anchor body, the structural bottom plate 1 is provided with an anchor backing plate 2, and the upper end of each anchor rope 4 passes through the opening of the structural bottom plate 1 and is fixed on the anchor backing plate 2 through an anchorage device 3. And an anchor device 3 is arranged on the anchor backing plate 2, and the anchor cable 4 is stretched after the age or strength is reached. The anchor rope 4 is used for transmitting acting force, and the anti-pulling and anti-floating acting force of the anchor body in the anchor hole 16 is transmitted to the anchor backing plate 2, and the anchor backing plate 2 presses the structural bottom plate 1 down, so that the anchoring reinforcement of the existing basement layer is realized.

The anchor backing plate 2 is fixed on the structural bottom plate 1 by epoxy resin glue as a connecting layer. The lower end face of the anchor backing plate 2 is provided with a water stop strip 9, the water stop strip made of rubber is arranged at the junction of the lower part of the anchor backing plate and the opening of the structural bottom plate, and the structural bottom plate 1 and the anchor backing plate 2 are sealed by the water stop strip 9, so that groundwater infiltration is avoided. The upper layer of the structural bottom plate 1 is provided with a hydrophobic plate 7, the upper layer of the hydrophobic plate 7 is provided with a fiber concrete layer 8, a reinforcing mesh 18 is arranged in the fiber concrete layer 8, and a layer of drainage structure is arranged on the basis of the existing structural bottom plate 1.

The anchor backing plate 2, the anchorage 3 and the anchor cable 4 are connected into a whole through the filling block 10 formed by pouring epoxy resin mortar, and all the anchor backing plates 2, the anchorage 3 and the anchor cable 4 on three anchors of each group are connected into a whole through the filling block 10, so that an integral stress mechanism is formed, and the integral anti-floating effect is improved.

The anchor body comprises an upper free section 5 and a lower anchor section 6, wherein the free section 5 and the anchor section 6 are both positioned in the anchor hole 16, the friction force between the free section 5 and the anchor cable 4 is weak or no friction force is generated, and the anti-pulling and anti-floating force is mainly provided by virtue of the friction force between the anchor section 6 and the anchor cable 4.

The anchor cable 4 in the free section 5 is sleeved with a corrugated pipe 11. The corrugated pipe 11 is penetrated in the range of the free section, butter is smeared for corrosion prevention and the function of the free section is guaranteed, butter is used for filling and sealing in the range of 100-200mm at the two ends of the sleeve pipe of the free section, and cement mortar is used for filling between the outer wall of the corrugated pipe of the free section and the wall of the hole.

The high-pressure jet grouting drill rod extends into the hole bottom (single-pipe method), an anchoring section 6 is formed through high-pressure jet grouting, high-pressure jet grouting is conducted in the range of the anchoring section, the high-pressure jet grouting diameter is expanded to form the anchoring section, and cement paste is selected as grouting materials. A sediment section 17 is left between the anchor body and the bottom of the anchor hole 16.

A plurality of wire loops 12 and tightening rings 13 are arranged between the anchor ropes 4 in the anchoring section 6, the tightening rings 13 are positioned between two adjacent wire loops 12, the diameter of the tightening rings 13 is smaller than that of the wire loops 12, and a guide cap 14 is arranged between the end parts of the anchor ropes 4 in the anchoring section 6.

The anchor cable 4 adopts 2-4 steel strands, is put into the hole after being bound and formed by using the wire-lifting rings 12, is provided with one wire-lifting ring 12 at intervals of 2.0m along the axial direction of the cable body, ensures the cable body to be centered, and is tightly bound and spot-welded at the bottom by using iron wires at intervals of 1.0m between the two wire-lifting rings to form a tightening hoop 13.

The anchor cable 4 in the anchoring section 6 is provided with a centering bracket 15, the centering bracket 15 is of an outer supporting omega-shaped structure, the anchor cable 4 is bound by iron wires, the centering bracket 15 is in supporting contact with the inner wall of the anchor hole 16, and the anchor cable 4 is ensured to be positioned at the middle position by the centering bracket 15 at the outer side of the circumference.

The working flow of the utility model is as follows:

and placing the drilling machine in place according to the designed angle, wherein the drilling depth exceeds the design length of the anchor cable by a certain distance to serve as an over-drilling sediment section. The hole diameter is ensured to be determined, each 3 inclined pile type tree root piles are prestressed anti-floating anchor cables which are of a group of net structures, the vertical inclination angle of drilling holes is 10 degrees, and the drilling holes are arranged on a horizontal plane according to 120 degrees.

The length of the manufactured anchor cable is the length of an anchor section, a free section, the thickness of an original water-resistant plate (a structural bottom plate) and the length of a stretching section, three steel strands with the thickness of 15.24mm are adopted, a wire-setting ring is arranged at intervals of 2.0m along the axial direction of the free section of the cable body, a tightening hoop is tied between the two wire-setting rings at intervals of 1.0m by 8-number iron wires, and the bottoms are tied tightly and spot-welded firmly. The steel strand at the upper free section is penetrated through the sleeve and smeared with butter for anticorrosion measures, and after the drilling is completed and the hole is cleared, the manufactured steel strand is put into the hole, the steel strand is required to be put down to the designed depth, and the error is not more than 10cm.

High-pressure jet grouting: and (3) performing high-pressure jet grouting at the lower part of the anchor rope hole site (the lower anchoring section and the over-drilling sediment section).

Filling cement mortar in the free section: after the cement paste of the anchoring section is initially set, the free section is poured and compacted by adopting M30 cement mortar, and is poured to the elevation at the lower part of the anchor backing plate, and is compacted and trowelled. Primary waterproof: and (3) installing a rubber water stop strip within half an hour of cement mortar pouring, wherein the rubber water stop strip is needed to be semi-embedded into the cement mortar as a primary waterproof structure of the anchor cable.

And (3) filling epoxy resin glue: epoxy resin glue poured at the lower part of the anchor backing plate range before stretching is used as a connecting layer, and the waterproof reinforcing effect is simultaneously achieved through the flexible connecting layer.

Installing an anchor backing plate: and the anchor backing plate is immediately installed after the epoxy resin glue is filled, the anchor backing plate is installed to be stably and lightly put, the epoxy resin glue is prevented from being unevenly extruded, and the installation angle of the anchor backing plate is perpendicular to the anchor cable.

And (3) tensioning the anchor cable after the strength of the anchor cable reaches a design value, locking the anchor head by using a clamp after the anchor cable is tensioned to the design value and is stable, and cutting off redundant steel strands after locking so that the steel strands exceed the anchor.

And (3) secondary waterproof: after the anchor head is locked, the anchor head is poured and wrapped tightly by epoxy sand glue, and the anchor head is uniformly wrapped into a hemispherical shape with the thickness of 40-50mm. And after a drainage plate and a single-layer bidirectional reinforcing mesh are arranged above the structural bottom plate, pouring a fiber concrete body to form a newly added drainage layer.

The foregoing basic embodiments of the utility model, as well as other embodiments of the utility model, can be freely combined to form numerous embodiments, all of which are contemplated and claimed. In the scheme of the utility model, each selection example can be arbitrarily combined with any other basic example and selection example.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The utility model provides an anti anchor rope construction structure that floats of stake formula prestressing force, includes anchor eye (16) of structure bottom plate (1) and structure bottom plate (1) lower part, the anchor body that is equipped with in anchor eye (16), its characterized in that: the anchor body be the slope and arrange, be equipped with anchor rope (4) in the anchor body, be equipped with anchor backing plate (2) on structure bottom plate (1), the upper end of anchor rope (4) passes structure bottom plate (1) and fixes on anchor backing plate (2) through ground tackle (3), the anchor body includes free section (5) and the anchor section (6) of lower part on upper portion, free section (5) and anchor section (6) all are located anchor hole (16).

2. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1, wherein: the anchoring bodies are three groups, and three anchoring bodies in each group form a triangular pyramid structure.

3. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1 or 2, wherein: the inclination angle between the anchors and the vertical line is 5-15 degrees, and the projection of two adjacent anchors in each group of anchors on the horizontal plane forms an included angle of 120 degrees.

4. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1, wherein: the upper layer of the structural bottom plate (1) is provided with a hydrophobic plate (7), the upper layer of the hydrophobic plate (7) is provided with a fiber concrete layer (8), and a reinforcing mesh (18) is arranged in the fiber concrete layer (8).

5. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1 or 4, wherein: the lower end face of the anchor backing plate (2) is provided with a water stop strip (9), the water stop strip (9) is positioned in an opening of the structural bottom plate (1) and embedded into concrete, and the anchor backing plate (2) is fixed on the structural bottom plate (1) through a connecting layer.

6. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1 or 2, wherein: the anchor backing plate (2), the anchorage device (3) and the anchor cable (4) are connected into a whole through the filling block (10).

7. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1, wherein: the anchor cable (4) in the free section (5) is sleeved with a corrugated pipe (11).

8. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1, wherein: a plurality of wire rings (12) and tightening rings (13) are arranged between the anchor ropes (4) in the anchoring section (6), the tightening rings (13) are positioned between two adjacent wire rings (12), and the diameter of the tightening rings (13) is smaller than that of the wire rings (12).

9. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1 or 8, wherein: a guide cap (14) is arranged between the end parts of the anchor cables (4) in the anchoring section (6).

10. The inclined pile type prestress anti-floating anchor cable construction structure according to claim 1 or 8, wherein: and a centering bracket (15) is arranged on the anchor cable (4) in the anchoring section (6), and the centering bracket (15) is in supporting contact with the inner wall of the anchor hole (16).