阅读说明：本技术 一种基坑对拉锚杆支护体系及其施工方法 (Foundation pit counter-pulling anchor rod supporting system and construction method thereof ) 是由 何小飞 李红军 张延宁 胡娟 宋有旭 罗金玉 于 2020-05-20 设计创作，主要内容包括：本发明涉及一种基坑对拉锚杆支护体系,包括多根设置在相邻基坑相邻区域内的两排支护桩,还包括开设在相邻支护桩之间且贯穿相邻基坑相邻区域的安装槽,所述安装槽内设有定位架,所述定位架上水平设有对拉锚索,所述对拉锚索的两端分别延伸至支护桩处并连接有腰梁。通过在基坑相邻区域内开设安装槽代替现有的锚杆钻机成孔的施工方式,保证对拉锚索水平设置,具有施工周期短、施工成本低以及支护效果好的优点。(The invention relates to a foundation pit counter-pulling anchor rod supporting system which comprises a plurality of two rows of supporting piles arranged in adjacent areas of adjacent foundation pits and an installation groove which is arranged between the adjacent supporting piles and penetrates through adjacent areas of the adjacent foundation pits, wherein a positioning frame is arranged in the installation groove, a counter-pulling anchor rope is horizontally arranged on the positioning frame, and two ends of the counter-pulling anchor rope respectively extend to the supporting piles and are connected with waist beams. The construction mode that the existing jumbolter pore-forming is replaced by arranging the mounting groove in the adjacent region of the foundation pit ensures that the counter-pulling anchor cable is horizontally arranged, and the construction method has the advantages of short construction period, low construction cost and good supporting effect.)

1. The utility model provides a foundation ditch is to drawing anchor bolt support system, includes two rows of fender pile (2) of many settings in adjacent foundation ditch (1) adjacent area, its characterized in that: still including seting up mounting groove (3) between adjacent fender pile (2) and running through adjacent region in adjacent foundation ditch (1), the level is equipped with split anchor rope (5) in mounting groove (3), the both ends of split anchor rope (5) extend to fender pile (2) department respectively and are connected with waist rail (6).

2. A foundation pit counter-pulling anchor rod supporting system according to claim 1, wherein: a positioning frame (4) is arranged in the mounting groove (3), and the counter-pulling anchor cable (5) is horizontally arranged on the positioning frame (4).

3. A foundation pit counter-pulling anchor rod supporting system according to claim 2, wherein: every mounting groove (3) sets up a plurality of locating racks (4) along the length direction interval of mounting groove (3), to drawing anchor rope (5) level in proper order and passing each locating rack (4).

4. A foundation pit counter-pulling bolting system according to any one of claims 2-3, characterized in that: the positioning frame (4) comprises two rows of vertical steel bars (41) which are arranged at intervals, each row of vertical steel bars (41) is fixedly connected through a horizontal steel bar (42), and a plurality of horizontal steel bars (42) are arranged at intervals along the length direction of the vertical steel bars (41); the two rows of vertical steel bars (41) are connected through a plurality of annular stirrups (43), and the stirrups (43) are hooped on the two rows of vertical steel bars (41) corresponding to each other.

5. The foundation pit counter-pulling anchor rod supporting system according to claim 4, wherein: two stirrups (43) which are adjacent along the horizontal direction are alternately hooped on the same pair of vertical reinforcing steel bars (41).

6. The foundation pit counter-pulling anchor rod supporting system according to claim 4, wherein: the opposite-pulling anchor cable (5) is arranged on the vertical steel bar (41) or the stirrup (43) or the horizontal steel bar (42).

7. A foundation pit counter-pulling anchor rod supporting system according to claim 1, wherein: and backfill soil is arranged in the mounting groove (3).

8. A foundation pit counter-pulling anchor rod supporting system according to claim 1, wherein: the width of the mounting groove (3) is 300-600 mm.

9. A foundation pit counter-pulling anchor rod supporting system according to claim 1, wherein: the counter-pulling anchor cables (5) are arranged one by one in every 1-2m of the vertical direction, and one by one in every 5-10m of the horizontal direction.

10. A construction method of a foundation pit counter-pulling anchor rod supporting system is characterized by comprising the following steps:

s1, constructing a support pile (2);

s2, excavating a mounting groove (3) between adjacent supporting piles (2) in the adjacent area of the adjacent foundation pit (1);

s3, positioning the setting position of the opposite pulling anchor cable (5) on the positioning frame (4), horizontally fixing the opposite pulling anchor cable (5) on the positioning frame (4), and then hoisting the positioning frame (4) into the mounting groove (3);

and S4, enabling two ends of the opposite-pull anchor cable (5) to respectively penetrate through the waist beam (6), enabling the waist beam (6) to abut against the support pile (2), and locking the opposite-pull anchor cable (5) and the waist beam (6) through an anchorage device.

Technical Field

The invention relates to the technical field of foundation pit supporting, in particular to a foundation pit counter-pulling anchor rod supporting system and a construction method thereof.

Background

With the accelerated development of the urbanization process in China, urban construction is encountering more and more deep foundation pit projects, and with the increasing shortage of construction land, more and more deep foundation pits need to be constructed in dense areas of urban buildings, and the problem of support of adjacent deep foundation pits is inevitably encountered. When the distance between adjacent foundation pits is 10-20m, the distance is small, and when a small-clear-distance land block is in a special condition (for example, an upper main body structure or a traffic main road and the like cause that the land block cannot be excavated), the conventional pile anchor support is not suitable any more due to the insufficient anchoring force of the anchor rope. The support mode commonly used for the working condition is a split anchor rod support.

The prior application number for reference is CN201920441551.X, a combined supporting system for adjacent deep foundation pits based on row piles, connecting beams and opposite-pulling anchor cables comprises row piles, crown beams, connecting beams, opposite-pulling anchor cables and a steel plate pavement; a plurality of rows of piles are arranged in adjacent areas of the first deep foundation pit and the second deep foundation pit at equal intervals to form two rows of oppositely arranged supporting structures, and two rows of piles oppositely arranged in the two rows of supporting structures are used as a group of supporting units; opposite-pulling anchor cables are arranged between two rows of piles of each group of supporting units, the tops of the two rows of supporting structures are connected through crown beams, and a plurality of connecting beams are connected between the crown beams of the two rows of supporting structures to form an integrated combined supporting system; the steel plate road surface is fixedly paved on the crown beam and the connecting beam. The scheme is suitable for construction of adjacent deep foundation pits with adjacent plane positions, short distance and similar foundation pit engineering construction period.

The above prior art solutions have the following drawbacks: because the opposite-pulling anchor cables are horizontally arranged between adjacent row piles, when the anchor rod drilling machine drills holes, due to different geological hardness degrees, the anchor rod drilling machine is easy to deviate in the horizontal or vertical direction in the drilling process of the anchor rod drilling machine, when the anchor rod drilling machine deviates in the horizontal direction, the anchor rod drilling machine can be drilled on the row piles, and at the moment, the anchor rod drilling machine needs to drill holes again; when the deviation in the vertical direction occurs, the anchor cable cannot be completely installed on the waist beam, and the supporting effect is affected. Therefore, a counter-pulling anchor cable supporting technology for adjacent foundation pits is needed to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a foundation pit counter-pulling anchor rod supporting system which has the advantage of ensuring the counter-pulling anchor cables to be horizontally arranged.

The second purpose of the invention is to provide a construction method of a foundation pit counter-pulling anchor rod supporting system, which has the advantages of convenient construction, short period and low cost.

The first object of the present invention is achieved by the following technical solutions:

the utility model provides a foundation ditch is to drawing anchor bolt support system, includes many two rows of fender piles that set up in adjacent regional intra-area of adjacent foundation ditch, still includes the mounting groove of seting up between adjacent fender pile and running through adjacent regional area of adjacent foundation ditch, the level is equipped with the anchor rope of drawing to the mounting groove, the both ends of drawing the anchor rope extend to fender pile department respectively and are connected with the waist rail.

By adopting the technical scheme, the installation groove is formed in the adjacent area of the foundation pit to replace the conventional anchor rod drilling construction, then the opposite-pull anchor cable is directly horizontally oppositely pulled in the installation groove and locked by the waist beam, so that the installation of the opposite-pull anchor cable is completed, and meanwhile, the position of the opposite-pull anchor cable is conveniently adjusted secondarily in the installation groove to be matched with the waist beam; compared with the traditional anchor rod construction process, the process is simple, and the horizontal arrangement of the counter-pull anchor cables and the supporting effect of the counter-pull anchor cables are guaranteed; the anchor rod drilling machine is prevented from drilling, the anchor rod drilling machine deviates in the horizontal or vertical direction in the drilling process of the anchor rod drilling machine due to different geological hardness degrees, and the anchor rod drilling machine can be drilled to the support pile when the anchor rod drilling machine deviates in the horizontal direction, and drilling needs to be carried out again at the moment; when the skew of vertical direction takes place, can cause to drawing on the anchor rope can't all install to the waist rail, influence the problem of strutting the effect.

The present invention in a preferred example may be further configured to: and a positioning frame is arranged in the mounting groove, and the opposite-pulling anchor cable is horizontally arranged on the positioning frame.

Through adopting above-mentioned technical scheme, will in advance fix on the locating rack to drawing anchor rope level, hang the locating rack and put to the mounting groove in, it is more convenient to install, sets up on the locating rack in advance to drawing the anchor rope simultaneously, and levelness control is more accurate.

The present invention in a preferred example may be further configured to: and a plurality of positioning frames are arranged on each mounting groove at intervals along the length direction of the mounting groove, and the opposite-pulling anchor cables sequentially and horizontally penetrate through the positioning frames.

Through adopting above-mentioned technical scheme, can enough guarantee the level setting of split anchor rope, can reduce the cost input of locating rack again.

The present invention in a preferred example may be further configured to: the positioning frame comprises two rows of vertical reinforcing steel bars arranged at intervals, each row of vertical reinforcing steel bars is fixedly connected through a horizontal reinforcing steel bar, and a plurality of horizontal reinforcing steel bars are arranged at intervals along the length direction of the vertical reinforcing steel bars; the two rows of vertical reinforcing steel bars are connected through a plurality of annular stirrups, and the stirrups are hooped on the two rows of vertical reinforcing steel bars which correspond to each other.

Through adopting above-mentioned technical scheme, through many horizontal steel bars with every row of vertical steel bar connection for whole unit, then utilize the stirrup hoop to establish on the vertical steel bar that corresponds each other on two whole units, be connected two whole units as an organic wholes to form a stable locating rack, processing is convenient, is convenient for to the installation of drawing the anchor rope.

The present invention in a preferred example may be further configured to: two adjacent stirrups along the horizontal direction are alternately hooped on the same pair of vertical reinforcing steel bars.

Through adopting above-mentioned technical scheme, with stirrup cross arrangement, increase the wholeness and the stability of locating rack.

The present invention in a preferred example may be further configured to: the opposite-pulling anchor cable is arranged on the vertical steel bar or the stirrup or the horizontal steel bar.

By adopting the technical scheme, the appropriate mode of the counter-pulling anchor cable can be selected according to different setting positions, so that the counter-pulling anchor cable is convenient to install and position.

The present invention in a preferred example may be further configured to: and backfill soil is arranged in the mounting groove.

Through adopting above-mentioned technical scheme, carry out the backfill soil in the mounting groove, can fill the mounting groove, avoid later stage foundation ditch construction's in-process mounting groove to take place to sink, influence supporting construction's stability.

The present invention in a preferred example may be further configured to: the width of the mounting groove is 300-600 mm.

The present invention in a preferred example may be further configured to: the counter-pulling anchor cables are arranged one by one at every 1-2m in the vertical direction, and one at every 5-10m in the horizontal direction.

Through adopting above-mentioned technical scheme, for the construction mode of a traditional stake anchor or two anchors, this scheme has increased the installation density of pulling the anchor rope on every locating rack, has increased the distance between the adjacent locating rack, has reduced the quantity that sets up of mounting groove and locating rack, great shortening construction cycle, reduced construction cost, guarantee the effect of strutting of pulling the anchor rope simultaneously.

The second object of the present invention is achieved by the following technical solutions:

a construction method of a foundation pit counter-pulling anchor rod supporting system comprises the following steps:

s1, constructing a support pile;

s2, excavating a mounting groove between adjacent support piles in the adjacent area of the adjacent foundation pit;

s3, positioning the setting position of the opposite pulling anchor cable on the positioning frame, horizontally fixing the opposite pulling anchor cable on the positioning frame, and then hoisting the positioning frame into the installation groove;

and S4, enabling two ends of the opposite-pull anchor cable to respectively penetrate through the waist beam, enabling the waist beam to abut against the support pile, and locking the opposite-pull anchor cable and the waist beam through the anchorage device.

Through adopting above-mentioned technical scheme, through will drawing anchor rope level setting in advance on the locating rack, then set up the mounting groove in the adjacent region of foundation ditch, the locating rack install to the mounting groove in can, compare in traditional stock construction process, simple process guarantees to drawing anchor rope level setting and to drawing the effect of strutting of anchor rope.

The present invention in a preferred example may be further configured to: after step S4, backfill is filled into the installation groove.

In summary, the invention has the following beneficial technical effects:

the conventional anchor rod drilling construction is replaced by arranging the installation groove at the adjacent area of the foundation pit, then the counter-pull anchor cable is horizontally fixed on the positioning frame in advance, the positioning frame is hung in the installation groove, and then the counter-pull anchor cable is locked by matching with the waist beam, so that the installation of the counter-pull anchor cable is completed, compared with the traditional anchor rod construction process, the process is simple, and the horizontal arrangement of the counter-pull anchor cable and the supporting effect of the counter-pull anchor cable are ensured; the anchor rod drilling machine is prevented from drilling, the anchor rod drilling machine deviates in the horizontal or vertical direction in the drilling process of the anchor rod drilling machine due to different geological hardness degrees, and the anchor rod drilling machine can be drilled to the support pile when the anchor rod drilling machine deviates in the horizontal direction, and drilling needs to be carried out again at the moment; when the skew of vertical direction takes place, can cause to drawing on the anchor rope can't all install to the waist rail, influence the problem of strutting the effect.

Drawings

Fig. 1 is a schematic view of the supporting structure of the present invention.

Fig. 2 is a schematic structural diagram of the positioning frame of the present invention.

FIG. 3 is a schematic view of a plurality of alignment brackets of the present invention.

In the figure, 1, a foundation pit, 2 and a support pile; 3. mounting grooves; 4. a positioning frame; 41. vertical reinforcing steel bars; 42. horizontal reinforcing steel bars; 43. hooping; 5. oppositely pulling the anchor cable; 6. a wale.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the foundation pit counter-pulling anchor rod supporting system disclosed by the invention comprises a plurality of two rows of supporting piles 2 arranged in adjacent areas of adjacent foundation pits 1, wherein the supporting piles 2 in each row are uniformly arranged at intervals, and the positions of the supporting piles 2 in the two rows are in one-to-one correspondence. An installation groove 3 with an opening at the top is arranged in the adjacent area of the foundation pit 1 between each row of adjacent support piles 2, the installation groove 3 penetrates through the adjacent area of the adjacent foundation pit 1, and the width of the installation groove 3 is 300-600 mm. The mounting groove 3 is internally provided with a positioning frame 4, the positioning frame 4 is fixedly provided with a horizontally arranged opposite pulling anchor cable 5, two ends of the opposite pulling anchor cable 5 respectively extend to the supporting pile 2 and are connected with waist beams 6, and the waist beams 6 are abutted against the side wall of the supporting pile 2 and are locked with the opposite pulling anchor cable 5 through anchors.

The installation of the split anchor cable 5 is completed by arranging the installation groove 3 at the adjacent area of the foundation pit 1 to replace the conventional anchor rod drilling construction, horizontally fixing the split anchor cable 5 on the positioning frame 4 in advance, hoisting the positioning frame 4 into the installation groove 3, and locking the split anchor cable 5 by matching with the waist beam 6, compared with the traditional anchor rod construction process, the process is simple, and the horizontal arrangement of the split anchor cable 5 and the supporting effect of the split anchor cable 5 are ensured; the anchor rod drilling machine is prevented from drilling holes, due to different geological hardness degrees, the anchor rod drilling machine deviates in the horizontal or vertical direction in the drilling process of the anchor rod drilling machine, when the anchor rod drilling machine deviates in the horizontal direction, the anchor rod drilling machine can possibly drill the support piles 2, and at the moment, the anchor rod drilling machine needs to drill holes again; when the deviation in the vertical direction occurs, the anchor cables 5 cannot be completely installed on the waist beam 6, and the supporting effect is affected.

Referring to fig. 2, the locating rack 4 can be an integral erection in the mounting groove 3, the locating rack 4 includes two rows of vertical reinforcing bars 41 that the interval evenly set up, every row of vertical reinforcing bars 41 passes through horizontal reinforcing bar 42 and connects, horizontal reinforcing bar 42 is fixed with vertical reinforcing bar 41 welding or ligature, horizontal reinforcing bar 42 is along the even multichannel that sets up in length direction interval of vertical reinforcing bar 41, horizontal reinforcing bar 42 connects every row of vertical reinforcing bar 41 as the integral unit. Two rows of vertical reinforcing bars 41 are connected and fixed through a plurality of annular stirrups 43, the annular stirrups 43 are closed rectangles, the stirrups 43 are uniformly arranged in multiple rows along the length direction of each row of vertical reinforcing bars 41 at intervals, and two stirrups 43 adjacent along the horizontal direction in each row of stirrups 43 are alternately hooped on the same pair of vertical reinforcing bars 41 corresponding to the two rows of vertical reinforcing bars 41. The counter-pull anchor cables 5 are bound on the vertical steel bars 41 or the stirrups 43 or the horizontal steel bars 42, and a proper fixing mode can be adopted according to the design positions of the counter-pull anchor cables 5 on the positioning frames 4.

Referring to fig. 3, in addition, the positioning frame 4 may also be a plurality of sections, a plurality of sections of positioning frames 4 may also be arranged in each mounting groove 3 at intervals, wherein two sections of positioning frames 4 are respectively located at two ends of the mounting groove 3, at least 1 section of positioning frame 4 is additionally arranged between two sections of positioning frames 4 according to the length of the mounting groove 3, the opposite pulling anchor cables 5 sequentially horizontally pass through each positioning frame 4 and are fixed on the positioning frame 4, and by arranging the positioning frames 4 into a plurality of sections and at intervals, the horizontal arrangement of the opposite pulling anchor cables 5 can be ensured, and the cost input of the positioning frames 4 can be reduced.

The positioning frame 4 may only include the vertical reinforcing bars 41, the counter pull anchor cables 5 are fixed to the vertical reinforcing bars 41, the vertical reinforcing bars 41 are inserted into the mounting groove 3 to position the counter pull anchor cables 5, and the positioning frame 4 is not limited to the above fixing manner, and may also be other structures for positioning the counter pull anchor cables 5 in the mounting groove 3.

Further, in order to avoid the situation that collapse occurs when the installation groove 3 is constructed in the foundation pit 1 and the stability of the foundation pit 1 is affected, backfill soil is filled in the installation groove 3, the backfill soil fills the installation groove 3, the situation that the installation groove 3 collapses is avoided, and the supporting effect of the anchor cable 5 is guaranteed.

In order to shorten the construction period of the counter-pulling anchor cable 5 and reduce the construction cost, the setting density of the counter-pulling anchor cable 5 in the vertical direction of the foundation pit 1 is increased, the setting density of the counter-pulling anchor cable 5 in the horizontal direction is reduced, one counter-pulling anchor cable 5 is arranged every 1-2m in the vertical direction, one counter-pulling anchor cable 5 is arranged every 5-10m in the horizontal direction, compared with the traditional construction mode of one pile and one anchor or two piles and one anchor, the scheme increases the installation density of the counter-pulling anchor cable 5 on each positioning frame 4, increases the distance between the adjacent positioning frames 4, reduces the number of the installation grooves 3 and the positioning frames 4, greatly shortens the construction period, reduces the construction cost and simultaneously ensures the supporting effect of the counter-pulling anchor cable 5.

The implementation principle of the embodiment is as follows:

s1, construction of the support pile 2: and (3) paying off the position of the supporting pile 2 according to a construction drawing, constructing the supporting pile 2, and excavating the supporting pile 2 by adopting a mode of forming a hole by a rotary drilling rig or a mode of forming a hole by impact drilling.

S2, after the construction of the support piles 2 is completed and the strength is reached, setting out the opening positions of the mounting grooves 3 in the adjacent areas of the adjacent foundation pits 1, wherein the positions of the mounting grooves 3 are positioned between the adjacent support piles 2, the width of the mounting grooves 3 is 300-600mm, and the depth is the same as the position of the anchor cable 5 pulled oppositely at the lowest end of the foundation pit 1. And (4) adopting a grooving machine to perform grooving construction on the mounting groove 3.

S3, the positioning frame 4 is processed in advance when the supporting pile 2 is constructed, the counter-pull anchor cables 5 are fixed to the positioning frame 4 according to the design positions of the counter-pull anchor cables 5 on the foundation pit 1, and then the positioning frame 4 is transported to a construction site and is hung in the installation groove 3.

And S4, after the positioning frame 4 is hung, enabling two ends of the opposite-pull anchor cable 5 to respectively penetrate through the waist beam 6, enabling the waist beam 6 to abut against the support pile 2, and tensioning the opposite-pull anchor cable 5 through an anchorage device and locking the opposite-pull anchor cable 5 with the waist beam 6. After the completion, the mounting groove 3 is filled with backfill soil.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.