CN212336014U

CN212336014U - A anchor rope structure for excavation supporting

Info

Publication number: CN212336014U
Application number: CN202020677171.9U
Authority: CN
Inventors: 程峰; 廖洪杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2021-01-12
Anticipated expiration: 2030-04-28

Abstract

The utility model discloses an anchor rope structure for excavation supporting, including the foundation ditch, a fender pile, first anchor rope structure and second anchor rope structure, a fender pile top-down includes high pressure jet grouting pile and bored concrete pile, the top of high pressure jet grouting pile is provided with the hat roof beam, the middle part is provided with the waist rail, first anchor rope structure and second anchor rope structure all include the anchor rope and solidly anchor pipe, the part of anchor rope passes and pours to be fixed in solidly anchor pipe, solidly anchor pipe is provided with many pairs of grout holes through different diametric (al) in turn in the axial, the anchor rope one end of first anchor rope structure sets up on hat roof beam and the contained angle of first anchor rope structure and horizontal plane is got from 20-25 within ranges, the anchor rope one end of second anchor rope structure sets up on the waist roof beam and the contained angle of second anchor rope structure and horizontal plane is got from 25-30 within ranges. The anchor cable structure can be used for enhancing the ground support of the foundation pit and reducing the possibility of engineering accidents.

Description

A anchor rope structure for excavation supporting

Technical Field

The utility model relates to a excavation supporting's technical field to in particular to anchor rope structure for excavation supporting.

Background

The anchor cable support is a reinforcing support mode adopted in surface engineering such as side slopes, rock-soil deep foundation pits and the like and underground chamber construction such as tunnels, stopes and the like. The method is characterized in that a pole column is made of metal pieces, wood pieces, polymer pieces or other materials, and is driven into a hole which is drilled in advance in an earth surface rock body or a rock body around a chamber, and the special structure of the head part and the pole body and a tail supporting plate (which can be omitted) are utilized, or the surrounding rock and a stable rock body are combined together by depending on the bonding action to generate the suspension effect, the combination beam effect and the reinforcing effect, so that the aim of supporting is fulfilled. The method has the advantages of low cost, good supporting effect, simple and convenient operation, flexible use, less occupied construction clearance and the like.

The existing foundation pit supporting structure adopts a single anchor cable for supporting, although theoretical calculation meets requirements, most of actual load born in actual experiments is far lower than a design value, and the stability of the foundation pit structure is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that the load of single anchor rope support among the prior art is far less than the design value, the utility model provides an anchor rope structure for excavation supporting for solve the load of single anchor rope support and be far less than the design value technological problem.

The utility model provides an anchor rope structure for excavation supporting, including the foundation ditch, a fender pile, first anchor rope structure and second anchor rope structure, a fender pile top-down includes high pressure jet grouting pile and bored concrete pile, the top of high pressure jet grouting pile is provided with the hat roof beam, the middle part is provided with the waist rail, first anchor rope structure and second anchor rope structure all include the anchor rope and solidus anchor pipe, the part of anchor rope is passed and is pour and be fixed in solidus anchor pipe, solidus anchor pipe's axial is gone up to be provided with many pairs of grout holes through different diametric (al) in turn, the anchor rope one end of first anchor rope structure sets up on the hat roof beam and the contained angle of first anchor rope structure and horizontal plane is got from 20-25 within ranges, the anchor rope one end of second anchor rope structure sets up on the waist roof beam and the contained angle of second anchor rope structure and horizontal plane is got from 25-30 within ranges. By means of the anchor cable structure, the loading capacity can be improved on the basis of the original single supporting structure, and the stability of the foundation pit structure is guaranteed.

Preferably, the anchor cable adopts 4 pre-stressed anchor cables with the diameter of 12.7. By adopting the prestressed anchor cable with the specification, the load capacity of the support can be ensured.

Preferably, the cross-sectional dimension of the crown beam is 600mm 1000 mm. The first anchor cable structure can be guaranteed to be stably fixed by means of the section specification of the crown beam.

Preferably, the cross-sectional dimension of the waist beam is 400 mm. The second anchor cable structure can be stably fixed by means of the section specification of the waist beam.

Preferably, the total length of the first cable line structure is taken in the range of 15m-25m, wherein the anchoring section in the first cable line structure is arranged in the range of 16m-20 m.

Preferably, the total length of the second cable bolt structure is taken in the range of 20m-25m, wherein the anchor segments in the second cable bolt structure are arranged in the range of 13m-20 m.

Preferably, the anchor tube diameter is taken in the range of 150mm to 180 mm. By virtue of this dimensioning, it can be ensured that the anchorage pipe has a sufficient prestress criterion and an axial internal force criterion.

Preferably, the distance between the crown beam and the wale in the height direction of the support pile is taken in the range of 1m-2 m. The waist beam is arranged below the crown beam, so that the supporting load of the foundation pit can be improved.

Preferably, the first anchor cable structure and the second anchor cable structure are pre-stressed at 100 KN. By virtue of this pre-stressing requirement, the tensile stress generated by the external load can be counteracted or reduced.

Preferably, the circle center lines of two adjacent pairs of pulp outlets are mutually perpendicular, and the pulp outlets are provided with anti-blocking barb structures. By means of the arrangement of the anchoring pipe with the structure, the anti-pulling capacity of the anchoring pipe can be improved, and the anchoring effect is improved.

The utility model discloses an anchor rope structure for excavation supporting, on original anchor rope supporting's basis, add an anchor rope and carry out the reinforcement, and through the angle of addding the anchor rope, length, and squeeze into the reasonable setting of position, make supporting construction's actual load satisfy the designing requirement, strengthened strutting to the foundation ditch, rely on the grout outlet that the interval of solid anchor pipe set up and prevent stifled barb structure simultaneously, make solid anchor pipe more difficult to be extracted, the effect of anchor has been promoted, the security has been improved, reduce the possibility that the engineering accident takes place.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain the principles of the invention. Other embodiments and many of the intended advantages of embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.

Fig. 1 is a schematic structural view of a cable bolt structure for supporting a foundation pit according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an anchor fixing pipe according to an embodiment of the present invention.

Detailed Description

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as "top," "bottom," "left," "right," "up," "down," etc., is used with reference to the orientation of the figures being described. Because components of embodiments can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and logical changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

Fig. 1 shows a schematic structural diagram of an anchor cable structure for supporting a foundation pit according to an embodiment of the present invention, as shown in fig. 1, this structure includes a support pile 1, a top beam 2, a waist beam 3, a first anchor cable structure 4 and a second anchor cable structure 5, wherein the support pile 1 includes a bottom cast-in-place pile 11 and a high-pressure jet grouting pile 12 on the cast-in-place pile 11, the top beam 2 is disposed on the top end of the high-pressure jet grouting pile 12, the waist beam 3 is disposed in the middle of the high-pressure jet grouting pile 12, the specific waist beam 3 and the top beam 2 are between 1m-2m in the height direction of the high-pressure jet grouting pile 12, preferably, according to multiple tests performed by the inventor of the present application, the size is set to 1.5m, so as to obtain a better supporting effect. One end of the first anchor cable structure 4 is fixedly connected with the crown beam 2, the other end of the first anchor cable structure is driven into the soil, the included angle between the first anchor cable structure 4 and the horizontal plane is within the range of 20-25 degrees, one end of the second anchor cable structure 5 is fixedly connected with the waist beam 3, the other end of the second anchor cable structure is driven into the soil, and the included angle between the second anchor cable structure 5 and the horizontal plane is within the range of 25-30 degrees. The supporting of the first anchor cable structure 4 and the second anchor cable structure 5 can enhance the foundation pit supporting, so that the actual load of the supporting structure meets the design requirements.

In specific embodiment, the cross sectional dimension of crown beam is 600mm 1000mm, and the cross sectional dimension of waist rail is 400mm, should realize that the cross sectional dimension of crown beam and waist rail can adopt other specification and dimension except above-mentioned cross sectional dimension according to actual need, can realize equally the utility model discloses a technological effect.

In the particular embodiment, the first cable structure 4 comprises a cable 41 and a tube 42, preferably, the cable 41 is a 4-wire pre-stressed cable with a diameter of 12.7mm, a length of 15m-25m, the tube 42 is set to 16m-20m, and the tube 42 has a diameter of 150mm-180 mm. The anchor fixing pipe 42 is of a hollow structure, and in the actual use process, the anchor cable 41 is inserted into the anchor fixing pipe 42, and then the anchor cable 41 and the anchor fixing pipe 42 are condensed into a whole through grouting. Further preferably, according to multiple tests of the inventor of the present application, the length of the anchor cable 42 is set to 25m, the length of the anchor fixing pipe 42 is set to 18m, and the diameter of the anchor fixing pipe 42 is selected to be 180mm, and the first anchor cable structure 4 under the parameter setting has good load-carrying capacity and supporting effect.

In the particular embodiment, the second cable line structure 5 comprises a cable line 51 and an anchor tube 52, preferably, the cable line 51 is a 5-line pre-stressed cable having a diameter of 12.7mm, a length taken in the range of 20-25 m, the anchor tube 52 is set to 13-20 m, and the anchor tube 52 has a diameter taken in the range of 150-180 mm. The anchor fixing pipe 52 is of a hollow structure, and in the actual use process, the anchor cable 51 is inserted into the anchor fixing pipe 52, and then the anchor cable 51 and the anchor fixing pipe 52 are condensed into a whole through grouting. Further preferably, according to multiple tests of the inventor of the present application, the length of the anchor cable 52 is set to 23m, the length of the anchor fixing pipe 52 is set to 17m, and the diameter of the anchor fixing pipe 52 is selected to be 180mm, so that the first anchor cable structure 5 with the parameter set has good load carrying capacity and supporting effect.

It should be appreciated that the specifications of the anchor cables and the anchor fixing tubes in the first anchor cable structure 4 and the second anchor cable structure 5 may be set to other dimensions besides the above dimensions, and are set to suitable specifications according to actual application scenarios.

In a particular embodiment, the first anchor cable structure and the second anchor cable structure are pre-stressed at 100 KN. By means of the prestress requirement, the tensile stress generated by external load can be offset or reduced, the performance of the structure during service is improved, the compressive stress is applied to the structure in advance during construction, the tensile stress caused by the load can be offset wholly or partially by the prestress during service of the structure, the structure is prevented from being damaged, and the structure does not generate cracks or cracks later under the condition of normal use.

With continuing reference to fig. 2, fig. 2 shows a schematic structural diagram of the anchor fixing pipe according to an embodiment of the present invention, as shown in fig. 2, the anchor fixing pipe is provided with a plurality of pairs of grout outlet holes 7 along the axial direction in turn through different diameter directions, preferably, the circle center lines of two adjacent pairs of the grout outlet holes 7 are perpendicular to each other. Go out to correspond on the thick liquid hole 7 and be provided with and prevent stifled barb structure 8, it is concrete, prevent stifled barb structure 8 and form for the angle steel cutting, its cover with go out the top of thick liquid hole 7 for prevent that the circumstances that the play thick liquid hole was blockked up from taking place when the slip casting, simultaneously, the barb structure that this structure formed can prevent effectively that solid anchor pipe is extracted, has improved the resistance to plucking ability of solid anchor pipe, the effect of reinforcing anchor. The front end of the anchoring pipe is also provided with a cap wedge 8, so that the anchoring pipe can be conveniently driven into the soil.

Table 1 shows data of the anchor cable tensioning test performed by the inventor of the present application using a jack, wherein the model of the jack is YCW65T-150, and a calibration equation adopts: and y is 0.0769x-0.40, wherein y represents the pressure of the jack and x represents the tension value of the anchor cable. As can be seen from table 1, by using the anchor cable structure for foundation pit support, the actual load borne in the actual test is higher than the design value, and the stability of the foundation pit structure is strong.

Table 1:

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit and scope of the invention. In this way, if these modifications and changes are within the scope of the claims of the present invention and their equivalents, the present invention is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps than those listed in a claim. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims shall not be construed as limiting the scope.

Claims

1. An anchor cable structure for supporting a foundation pit is characterized by comprising the foundation pit, a supporting pile, a first anchor cable structure and a second anchor cable structure, the support piles comprise high-pressure jet grouting piles and cast-in-place piles from top to bottom, the top parts of the high-pressure jet grouting piles are provided with crown beams, the middle parts of the high-pressure jet grouting piles are provided with waist beams, the first anchor cable structure and the second anchor cable structure both comprise anchor cables and anchor fixing pipes, parts of the anchor cables penetrate through and are fixed in the anchor fixing pipes in a pouring manner, a plurality of pairs of grout outlet holes are alternately arranged in the axial direction of the anchor fixing pipe in different diameter directions, one end of the anchor rope of the first anchor rope structure is arranged on the crown beam, the included angle between the first anchor rope structure and the horizontal plane is taken from the range of 20-25 degrees, one end of the anchor cable of the second anchor cable structure is arranged on the waist beam, and an included angle between the second anchor cable structure and the horizontal plane is within a range of 25-30 degrees.

2. The anchor cable structure for foundation pit support of claim 1, wherein the anchor cable is a prestressed anchor cable with 4 cables and 12.7 diameters.

3. The anchor cable structure for foundation pit support of claim 1, wherein the cross-sectional gauge of the crown beam is 600mm by 1000 mm.

4. The anchor cable structure for foundation pit support of claim 1, wherein the cross-sectional gauge of the waist beam is 400mm x 400 mm.

5. The anchor cable structure for use in foundation pit support of claim 1, wherein the first anchor cable structure has an overall length taken in the range of 15m-25m, wherein the anchor section in the first anchor cable structure is provided in the range of 16m-20 m.

6. The anchor cable structure for use in foundation pit support of claim 1, wherein the second anchor cable structure has an overall length taken in the range of 20m-25m, wherein the anchor section in the second anchor cable structure is provided in the range of 13m-20 m.

7. A cable bolt structure for foundation pit support according to claim 5 or 6, wherein the anchor tube diameter is taken in the range 150mm-180 mm.

8. The anchor cable structure for foundation pit support according to claim 1, wherein the distance between the crown beam and the wale in the height direction of the support pile is taken in a range of 1m-2 m.

9. The anchor cable structure for use in foundation pit support of claim 1, wherein the pre-stress of the first and second anchor cable structures is 100 KN.

10. The anchor cable structure for foundation pit support of claim 1, wherein the circle center lines of two adjacent pairs of grout outlet holes are perpendicular to each other, and an anti-blocking barb structure is arranged on the grout outlet holes.