CN208136918U - A kind of tubular type Soil-Nailing Wall Structure - Google Patents
A kind of tubular type Soil-Nailing Wall Structure Download PDFInfo
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- CN208136918U CN208136918U CN201820293469.2U CN201820293469U CN208136918U CN 208136918 U CN208136918 U CN 208136918U CN 201820293469 U CN201820293469 U CN 201820293469U CN 208136918 U CN208136918 U CN 208136918U
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 127
- 239000010959 steel Substances 0.000 claims abstract description 127
- 239000002689 soil Substances 0.000 claims abstract description 92
- 239000004567 concrete Substances 0.000 claims abstract description 16
- 239000011440 grout Substances 0.000 claims abstract description 6
- 239000011378 shotcrete Substances 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 15
- 239000002344 surface layer Substances 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 12
- 238000005553 drilling Methods 0.000 abstract description 8
- 230000002787 reinforcement Effects 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000004570 mortar (masonry) Substances 0.000 description 9
- 238000005507 spraying Methods 0.000 description 8
- 238000009412 basement excavation Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
本实用新型涉及一种管式土钉支护结构。管式土钉支护结构包括花钢管，花钢管一端为锥形钻头，另一端开口设有螺纹，花钢管管体表面设有出浆孔，管体上设有螺旋式钢肋，螺旋式钢肋紧邻锥形钻头；压力注浆时，注浆套管一端与花钢管开口端连接，另一端与注浆软连接；注浆完成后，拆下套管，花钢管开口端安装锚固结构，花钢管在混凝土面层排列为梅花形。本实用新型钢管直接打入土体，避免了钻孔注浆在松软的软土地区施工时，出现塌孔、埋钻及缩颈等问题。采用机械旋转钻入土体，减小钢管入土难度、钢管在入土过程中的损耗，加快施工进度；螺旋式钢肋使花钢管周边土体变得疏松，在压力注浆时，形成的浆与土体复合加固体直径较大，提高土钉抗拔力。
The utility model relates to a tubular soil nail support structure. The tubular soil nail support structure includes a flower steel pipe, one end of the flower steel pipe is a tapered drill bit, the other end is provided with a screw thread, the surface of the flower steel pipe body is provided with a grout hole, the pipe body is provided with a spiral steel rib, and the spiral steel The rib is next to the tapered drill bit; during pressure grouting, one end of the grouting casing is connected to the opening end of the flower pipe, and the other end is softly connected to the grouting; The steel pipes are arranged in a plum blossom shape on the concrete surface. The steel pipe of the utility model is directly driven into the soil body, avoiding problems such as hole collapse, buried drilling and necking when drilling and grouting are performed in soft soil areas. Mechanical rotary drilling is used to drill into the soil, reducing the difficulty of steel pipes entering the soil, the loss of steel pipes in the process of entering the soil, and speeding up the construction progress; the spiral steel ribs make the soil around the flower pipes loose, and the grout formed during pressure grouting and grouting The diameter of the soil composite reinforcement is larger, which improves the pullout resistance of the soil nail.
Description
技术领域technical field
本实用新型属于岩土工程领域，具体涉及一种管式土钉支护结构。The utility model belongs to the field of geotechnical engineering, in particular to a tubular soil nail support structure.
背景技术Background technique
基坑、边坡等岩土锚固工程中，土钉的应用非常广泛。传统土钉一般采用钢筋土钉，钢筋土钉的施工过程，需要预先机械钻孔，成孔后为防止出现塌孔现象应尽快插入钢筋杆体，同时钢筋需要采取一定措施使其位于孔中心位置，使钢筋完全发挥作用，土钉插入后，注射砂浆使土钉与土体嵌固。在一些土质较软的地区，例如，回填土、松软的淤泥质土、可液化沙土等，这种土钉支护形式，通常难以形成稳定的钻孔，在机械钻孔过程中易出现塌孔、埋钻及缩颈等问题。现有管式土钉采用机械式打入方式，在打入夯击过程中易造成钢管打入部位损坏，同时所形成的砂浆加固的土体是否均匀难以保证，土钉强度难以保证。Soil nails are widely used in rock and soil anchoring projects such as foundation pits and slopes. Traditional soil nails generally use reinforced soil nails. The construction process of reinforced soil nails requires mechanical drilling in advance. After the holes are formed, in order to prevent the hole from collapsing, the reinforcement rod body should be inserted as soon as possible. Make the steel bar fully play its role, after the soil nail is inserted, inject mortar to make the soil nail and the soil embedded. In some areas with soft soil, such as backfill, soft muddy soil, liquefiable sand, etc., this form of soil nailing is usually difficult to form a stable borehole, and the hole is prone to collapse during the mechanical drilling process. , Buried drilling and necking and other issues. Existing tubular soil nails use a mechanical driving method, which easily causes damage to the steel pipe driving part during the driving and tamping process. At the same time, it is difficult to ensure whether the formed mortar-reinforced soil is uniform and the strength of the soil nail is difficult to guarantee.
实用新型内容Utility model content
本实用新型提供一种钢管高压注浆加固土体形成的新型土钉支护结构。采用新型螺旋钢肋花钢管，便于采用机械方式将钢管旋入土体，减小钢管入土难度及钢管在入土过程中的损耗；另外，螺旋钢肋在钻入过程中可以使钢管周边土体疏松，便于注浆，压力注浆后沿土钉长度形成的线状土体加固区，改善软土体的力学性能，提高了土体的抗剪强度。另一方面，砂浆和管状形成的巨大钢管与浆体结石柱具有较高的抗剪强度，基坑土体下滑时，上述二者的积极作用提高了基坑的稳定性和安全性。The utility model provides a novel soil nail support structure formed by steel pipe high-pressure grouting to reinforce soil. The use of a new type of spiral steel rib flower steel pipe is convenient for mechanically screwing the steel pipe into the soil, reducing the difficulty of the steel pipe entering the soil and the loss of the steel pipe in the process of entering the soil; in addition, the spiral steel rib can loosen the soil around the steel pipe during the drilling process , It is convenient for grouting, and the linear soil reinforcement zone formed along the length of the soil nail after pressure grouting improves the mechanical properties of the soft soil and increases the shear strength of the soil. On the other hand, the huge steel pipes and slurry stone columns formed by mortar and tubes have high shear strength. When the foundation pit soil slides down, the positive effects of the above two improve the stability and safety of the foundation pit.
本实用新型技术方案如下：The technical scheme of the utility model is as follows:
一种管式土钉支护结构，包括花钢管、锚固结构、喷射混凝土面层和注浆套管；所述锚固结构包括固定螺帽及钢垫板；所述花钢管一端为锥形端头，另一端为开口端，开口端设有螺纹，花钢管管体表面设有出浆孔，花钢管管体外壁上焊接有螺旋式钢肋，所述螺旋式钢肋紧邻锥形端；花钢管内通过软管先注满浆体，软管取出后将注浆套筒一端与花钢管开口端连接，另一端连接注浆软管，用水泥浆高压泵压力注浆，砂浆渗入周边土体中，起到加固土体的作用；压力注浆完成后，将注浆套管拆下，花钢管开口端安装钢垫板和固定螺帽，所述定螺帽和花钢管开口端的螺纹相配合，所述花钢管在混凝土面层上采用梅花形排列布置，水平间距和竖向间距为0.8-1.5m。A tubular soil nail support structure, comprising a flowered steel pipe, an anchoring structure, a shotcrete surface and a grouting sleeve; the anchoring structure includes a fixing nut and a steel backing plate; one end of the flowered steel pipe is a tapered end , the other end is an open end, the open end is provided with threads, the surface of the flower steel pipe body is provided with a slurry hole, and the outer wall of the flower steel pipe pipe is welded with a spiral steel rib, and the spiral steel rib is close to the tapered end; the flower steel pipe The inside is first filled with slurry through the hose, and after the hose is taken out, one end of the grouting sleeve is connected to the open end of the flower steel pipe, and the other end is connected to the grouting hose, and the grouting is pressure-grouted with a high-pressure cement slurry pump, and the mortar penetrates into the surrounding soil. It plays the role of strengthening the soil; after the pressure grouting is completed, the grouting sleeve is removed, and the steel backing plate and the fixed nut are installed at the open end of the flower steel pipe. The flower-shaped steel pipes are arranged in a plum blossom shape on the concrete surface, with a horizontal and vertical spacing of 0.8-1.5m.
所述混凝土面层由通长纵向钢筋、通长横向钢筋、钢筋网和喷射混凝土组成，喷射厚度为80-120mm。The concrete surface layer is composed of full-length longitudinal steel bars, full-length transverse steel bars, steel mesh and sprayed concrete, and the sprayed thickness is 80-120mm.
所述出浆孔采取梅花式或螺旋式布置，出浆孔直径为5-10mm，间距为0.2-0.5m。避免钢管同一截面处强度降低较大。The pulp outlet holes are arranged in a plum blossom or a spiral pattern, the diameter of the pulp outlet holes is 5-10mm, and the spacing is 0.2-0.5m. Avoid a large decrease in strength at the same section of the steel pipe.
注浆套管一端与花钢管开口端由丝扣连接固定，另一端与注浆软由钢丝连接固定。One end of the grouting casing is connected and fixed with the open end of the flower pipe by a threaded buckle, and the other end is connected and fixed with the grouting hose by a steel wire.
所述花钢管锚固于喷射混凝土面层，所述钢垫板作为锚下传力构件，尺寸为0.3×0.3m，厚10-15mm，中心留有和钢管相同直径的圆孔。The flowered steel pipe is anchored to the sprayed concrete surface, and the steel backing plate is used as a force transmission member under the anchor, with a size of 0.3×0.3m and a thickness of 10-15mm, and a round hole with the same diameter as the steel pipe is left in the center.
所述螺旋式钢肋高度为30-50mm、肋宽3-5mm、间距为100mm，其布置长度约0.5-1.0m；所述开口端的螺纹布置长度为50-100mm。The height of the spiral steel ribs is 30-50mm, the width of the ribs is 3-5mm, the spacing is 100mm, and the arrangement length is about 0.5-1.0m; the arrangement length of the threads at the opening end is 50-100mm.
本实用新型还提供一种管式土钉支护结构的施工方法，包括以下步骤：The utility model also provides a construction method of a tubular soil nail support structure, which includes the following steps:
1)确定开挖位置，按设计进行放坡，挖土至第一道土钉标高深度，清理坡面，预留花钢管孔位并作出标记，邦扎钢筋网，喷射混凝土，形成喷射混凝土面层；1) Determine the excavation position, carry out slope grading according to the design, excavate to the depth of the first soil nail level, clean up the slope, reserve and mark the hole position of the flower pipe, bond the steel mesh, spray concrete, and form the sprayed concrete surface Floor;
2)待混凝土面层强度达到规定强度，将花钢管机械旋转式钻入土体；2) When the strength of the concrete surface layer reaches the specified strength, mechanically rotate the flower pipe into the soil;
3)在花钢管开口端周围封孔，避免压力注浆过程中，砂浆从花钢管开口端周围喷出；3) Seal the hole around the open end of the flower steel pipe to avoid the mortar spraying out from around the open end of the flower steel pipe during the pressure grouting process;
4)先采用小直径的注浆软管深入花钢管底部，由里向外逐渐将花钢管内注满浆体，取出注浆软管；将注浆套筒一端与花钢管开口端连接，另一端连接注浆软管，用水泥浆高压泵压力注浆，注浆压力1-2MPa，稳压5分钟，砂浆渗入周边土体中，起到加固土体的作用；4) Use a small-diameter grouting hose to go deep into the bottom of the flower steel pipe, gradually fill the flower steel pipe with slurry from the inside to the outside, and take out the grouting hose; connect one end of the grouting sleeve to the open end of the flower steel pipe, and the other One end is connected to the grouting hose, and the grouting pressure is grouted with a high-pressure pump of cement slurry. The grouting pressure is 1-2 MPa, and the pressure is stabilized for 5 minutes. The mortar penetrates into the surrounding soil to strengthen the soil;
5)注浆完成后，拆除注浆套筒，在花钢管开口端安装钢垫板，采用机械设备将固定螺帽旋紧到花钢管开口端的螺纹，以提供微预应力；5) After the grouting is completed, remove the grouting sleeve, install a steel backing plate at the open end of the flower steel pipe, and use mechanical equipment to tighten the fixing nut to the thread at the open end of the flower steel pipe to provide micro-prestressing;
6)待已施工完的土钉达到70％设计强度后，可挖土至下一道土钉标高深度，进行下一道土钉的施工。6) After the completed soil nails reach 70% of the design strength, the soil can be excavated to the depth of the next soil nail level to carry out the construction of the next soil nail.
本实用新型突出的有益效果在于：The outstanding beneficial effects of the utility model are:
(1)本实用新型可靠性强，采用钢管式土钉，钢管旋转钻入土体，避免了在一些松软的软土地区施工时，易出现塌孔、埋钻及缩颈等施工问题；(1) The utility model has high reliability, adopts steel pipe type soil nails, and the steel pipe is rotated to drill into the soil, which avoids construction problems such as hole collapse, buried drill and necking when construction is carried out in some soft soil areas;
(2)钢管入土端头部位采用螺旋式钢肋构造，减小钢管入土难度及钢管在入土过程中的损耗，可以加快施工进度；同时在成型后的土钉结构中提高端部锚固力，防止混凝土与钢管出现脱离现象；(2) The end of the steel pipe in the soil adopts a spiral steel rib structure, which reduces the difficulty of the steel pipe in the soil and the loss of the steel pipe in the process of entering the soil, and can speed up the construction progress; at the same time, the end anchorage force is improved in the formed soil nail structure, Prevent the separation between concrete and steel pipe;
(3)土钉抗拔力高。花钢管在钻进过程中，螺旋式钢肋使的花钢管周边土体变得疏松，在压力注浆时，砂浆渗入土钉周围土体中，形成的浆与土体复合加固体直径较大，提高土钉抗拔力；(3) Soil nails have high pull-out resistance. During the drilling process of the steel pipe, the spiral steel rib makes the soil around the steel pipe loose. During the pressure grouting, the mortar penetrates into the soil around the soil nail, and the composite reinforcement of the slurry and the soil formed has a larger diameter. , to improve the pullout resistance of soil nails;
(4)支护结构变形小。钢管端口螺纹与固定螺帽和钢垫板的配套使用，可以为土钉提供微预应力，以降低支护结构变形；(4) The deformation of the supporting structure is small. The matching use of steel pipe port threads, fixing nuts and steel backing plates can provide micro-prestress for soil nails to reduce the deformation of the support structure;
(5)压力注浆后沿土钉长度形成的线状土体加固区，改善软土体的力学性能，提高了土体的抗剪强度。另一方面，砂浆和管状形成的巨大钢管与浆体结石柱具有较高的抗剪强度，基坑土体下滑时，上述二者的积极作用提高了基坑的稳定性和安全性。(5) The linear soil reinforcement zone formed along the length of the soil nail after pressure grouting improves the mechanical properties of the soft soil and increases the shear strength of the soil. On the other hand, the huge steel pipes and slurry stone columns formed by mortar and tubes have high shear strength. When the foundation pit soil slides down, the positive effects of the above two improve the stability and safety of the foundation pit.
(6)实用性强，可广泛应用于回填土，松软的淤泥质土，可液化沙土等土质松软地区。(6) It has strong practicability and can be widely used in soft soil areas such as backfill, soft muddy soil, and liquefiable sandy soil.
附图说明Description of drawings
图1为本实用新型花钢管及注浆套筒的示意图；Fig. 1 is the schematic diagram of the utility model spent steel pipe and grouting sleeve;
图2为本实用新型管式土钉支护完成后的整体结构平面示意图；Fig. 2 is a schematic plan view of the overall structure after the tubular soil nail support of the utility model is completed;
图3为本实用新型管式土钉支护完成后的整体结构立面示意图；Fig. 3 is a schematic diagram of the overall structure elevation after the tubular soil nail support of the utility model is completed;
图4为本实用新型各结构在挡土面上的位置排列示意图。Fig. 4 is a schematic diagram of the position arrangement of each structure of the utility model on the retaining surface.
标号及符号说明Labels and symbols
1-固定螺帽；2-钢垫板；3喷射混凝土面层；4-螺旋式钢肋；5-锥形端头；6-花钢管；7-地表面；8-坑底；9-出浆孔；10-注浆套筒；11-通长纵向钢筋；12-通长横向钢筋；13-钢筋网；14-基坑底部；15-地表面。1-fixed nut; 2-steel backing plate; 3 sprayed concrete surface; 4-spiral steel rib; 5-tapered end; 6-flowered steel pipe; 7-ground surface; Grout hole; 10-grouting sleeve; 11-long longitudinal reinforcement; 12-long transverse reinforcement; 13-reinforcing mesh; 14-bottom of foundation pit; 15-ground surface.
具体实施方式Detailed ways
下面结合附图和具体实施方式对本实用新型做进一步说明。The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.
实施例1Example 1
如图1－4所示，一种管式土钉支护结构包括花钢管6、锚固结构、喷射混凝土面层3和注浆套管10；所述锚固结构包括固定螺帽1及钢垫板2；所述花钢管6一端为锥形端头5，另一端为开口端，开口端设有螺纹，花钢管6管体表面设有出浆孔9，花钢管6管体外壁上焊接有螺旋式钢肋4，所述螺旋式钢肋4紧邻锥形端头5；花钢管6内先通过软管注满浆体；软管取出后将注浆套筒10一端与花钢管6开口端连接，另一端连接注浆软管，进行压力注浆(浆体从管体上的孔渗入土体)；压力注浆完成后，将注浆套管10拆下，花钢管6开口端安装钢垫板2和固定螺帽1，所述固定螺帽1和花钢管6开口端的螺纹相配合，所述花钢管6在混凝土面层3上采用梅花形排列布置，水平间距和竖向间距为0.8-1.5m。所述混凝土面层3由通长纵向钢筋11、通长横向钢筋12、钢筋网13和喷射混凝土组成，喷射厚度为80-120mm。所述出浆孔9采取梅花式或螺旋式布置，出浆孔9直径为5-10mm，间距为0.2-0.5m。所述花钢管6锚固于喷射混凝土面层3，所述钢垫板2作为锚下传力构件，尺寸为0.3×0.3m，厚10-15mm，中心留有和钢管相同直径的圆孔。所述螺旋式钢肋6高度为30-50mm、肋宽3-5mm、间距为100mm，其布置长度约0.5-1.0m；所述开口端的螺纹布置长度为50-100mm。As shown in Figures 1-4, a tubular soil nail support structure includes a flowered steel pipe 6, an anchoring structure, a shotcrete surface 3 and a grouting sleeve 10; the anchoring structure includes a fixing nut 1 and a steel backing plate 2. One end of the flower steel pipe 6 is a tapered end 5, the other end is an open end, and the open end is provided with threads, the surface of the flower steel pipe 6 is provided with a slurry hole 9, and the outer wall of the flower steel pipe 6 is welded with a spiral type steel rib 4, the spiral steel rib 4 is close to the tapered end 5; the inside of the flower steel pipe 6 is first filled with slurry through a hose; after the hose is taken out, one end of the grouting sleeve 10 is connected to the open end of the flower steel pipe 6 , the other end is connected to the grouting hose for pressure grouting (the slurry penetrates into the soil from the holes on the pipe body); after the pressure grouting is completed, the grouting sleeve 10 is removed, and the steel pad is installed at the open end of the flower steel pipe 6 The plate 2 and the fixed nut 1, the fixed nut 1 and the thread at the open end of the flower steel pipe 6 are matched, and the flower steel pipe 6 is arranged in a plum blossom shape on the concrete surface layer 3, and the horizontal distance and the vertical distance are 0.8- 1.5m. The concrete surface layer 3 is composed of full-length longitudinal steel bars 11, full-length transverse steel bars 12, steel mesh 13 and shotcrete, and the shot thickness is 80-120mm. The pulp outlet holes 9 are arranged in a plum blossom or spiral pattern, the diameter of the pulp outlet holes 9 is 5-10mm, and the spacing is 0.2-0.5m. The flower steel pipe 6 is anchored to the sprayed concrete surface 3, and the steel backing plate 2 is used as a force transmission member under the anchor, the size is 0.3×0.3m, the thickness is 10-15mm, and a circular hole with the same diameter as the steel pipe is left in the center. The height of the spiral steel ribs 6 is 30-50mm, the width of the ribs is 3-5mm, the spacing is 100mm, and the length of the arrangement is about 0.5-1.0m;
花钢管6可采用φ40mm、φ50mm、φ60mm厚3mm的普通圆钢管制作，花钢管6和配套的固定螺帽1及钢垫板2统一由工厂加工制作。Flower steel pipe 6 can adopt the common round steel pipe of φ40mm, φ50mm, φ60mm thick 3mm to make, and flower steel pipe 6 and supporting fixed nut 1 and steel backing plate 2 are unified by factory processing and manufacture.
一种管式土钉支护的施工步骤如下：The construction steps of a tubular soil nail support are as follows:
1)土方开挖1) Earth excavation
按设计规定的施工顺序进行，必须按分层开挖深度施工。土方每步开挖深度与土钉高度保持一至，基坑边壁应预留0.3-0.5m的土，宜采用小型机具或铁锹进行人工挖土清坡，以保证边坡平整。According to the construction sequence specified in the design, the construction must be carried out according to the layered excavation depth. The excavation depth of each earthwork step should be equal to the height of the soil nails, and 0.3-0.5m of soil should be reserved on the side walls of the foundation pit. It is advisable to use small machines or shovels to manually excavate the soil to clear the slope to ensure that the slope is smooth.
2)喷射混凝土面层施工2) Sprayed concrete surface construction
为保证压力注浆时，对注浆口侧土体进行封闭，防止开挖面出现漏浆、喷浆现象，应先进行混凝土面层施工，在喷射混凝土前，需先确定并预留出钢管孔位，在花钢管6打入位置处设置通长纵向连接筋11与通长横向连接筋12焊接，作为钢垫板下受力构件。邦扎钢筋网13，面层内的钢筋网片应牢固固定在边壁上，以符合规定保护层厚度的要求。喷射混凝土，形成喷射混凝土面层3；喷射混凝土强度为C20，粗骨料最大粒径不宜大于12mm，水灰比不宜大于0.5。喷射混凝土应分段进行，同一分段内混凝土喷射顺序至上而下，依次喷射厚度不宜小于40mm。喷射混凝土时，喷头与受喷面应保持垂直，距离宜为0.8-1.2m。喷射混凝土厚度为80-120mm。喷射混凝土终凝2h后，应喷水养护，待混凝土强度达到设计强度的70％后，可进行下一步施工，支护结构剖面图如图3所示；In order to ensure that the soil on the side of the grouting port is closed during pressure grouting, and to prevent grout leakage and spraying on the excavation surface, the concrete surface should be constructed first. Before spraying concrete, it is necessary to determine and reserve the steel pipe. For the hole position, a full-length longitudinal connecting rib 11 and a full-length transverse connecting rib 12 are welded at the piercing position of the flower steel pipe 6, as a stress member under the steel backing plate. Bangza steel mesh 13, the steel mesh sheet in the surface layer should be firmly fixed on the side wall to meet the requirements of the specified protective layer thickness. Shotcrete to form the sprayed concrete surface layer 3; the strength of the shotcrete is C20, the maximum particle size of coarse aggregate should not be greater than 12mm, and the water-cement ratio should not be greater than 0.5. Shotcrete should be carried out in sections, and the sequence of concrete spraying in the same section is from top to bottom, and the thickness of spraying in sequence should not be less than 40mm. When spraying concrete, the nozzle and the sprayed surface should be kept vertical, and the distance should be 0.8-1.2m. The thickness of shotcrete is 80-120mm. After the shotcrete is finally set for 2 hours, it should be cured by spraying water. After the concrete strength reaches 70% of the design strength, the next step of construction can be carried out. The cross-sectional view of the support structure is shown in Figure 3;
3)花钢管施工3) Flower steel pipe construction
花钢管待混凝土面层3强度达到规定强度，将花钢管6机械旋转式钻入土体；4)封孔When the strength of the concrete surface layer 3 reaches the specified strength, the flower steel pipe 6 is mechanically rotated into the soil; 4) sealing the hole
在花钢管6开口端周围封孔，避免压力注浆过程中，砂浆从花钢管6开口端周围喷出；Seal the hole around the opening end of the flower steel pipe 6 to prevent the mortar from spraying out from around the opening end of the flower steel pipe 6 during the pressure grouting process;
5)注浆5) Grouting
先采用小直径的注浆软管深入花钢管底部，由里向外逐渐将花钢管内注满浆体，取出注浆软管；将注浆套筒一端与花钢管开口端连接，另一端连接注浆软管，用水泥浆高压泵压力注浆，注浆压力1-2MPa，稳压5分钟，砂浆渗入周边土体中，起到加固土体的作用；First use a small-diameter grouting hose to go deep into the bottom of the steel pipe, gradually fill the steel pipe with slurry from the inside to the outside, and take out the grouting hose; connect one end of the grouting sleeve to the open end of the steel pipe and the other end to the The grouting hose is grouted with a high-pressure cement slurry pump, the grouting pressure is 1-2MPa, and the pressure is stabilized for 5 minutes. The mortar penetrates into the surrounding soil to strengthen the soil;
6)安装锚固结构6) Install the anchor structure
注浆完成后，拆除注浆套筒10，在花钢管6开口端安装钢垫板2，采用机械设备将固定螺帽1旋紧到花钢管6开口端的螺纹，以提供微预应力。After the grouting is completed, remove the grouting sleeve 10, install the steel backing plate 2 at the open end of the flower steel pipe 6, and use mechanical equipment to tighten the fixing nut 1 to the thread at the open end of the flower steel pipe 6 to provide micro-prestressing.
7)待已施工完的土钉达到70％设计强度后，可挖土至下一道土钉标高深度，进行下一道土钉的施工。7) After the completed soil nails reach 70% of the design strength, the soil can be excavated to the depth of the next soil nail level to carry out the construction of the next soil nail.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222022A (en) * | 2018-03-02 | 2018-06-29 | 大连理工大学 | A kind of tubular type Soil-Nailing Wall Structure and its construction method |
| CN110005872A (en) * | 2019-04-23 | 2019-07-12 | 河海大学 | An integrated pipeline for transportation and grouting and its operation method |
| CN110067253A (en) * | 2019-06-05 | 2019-07-30 | 招商局重庆交通科研设计院有限公司 | From anchoring miniature steel pipe anchoring pile |
| CN114197496A (en) * | 2021-12-16 | 2022-03-18 | 山东大学 | A kind of side slope reinforcement device and construction method of railway subgrade |
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2018
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222022A (en) * | 2018-03-02 | 2018-06-29 | 大连理工大学 | A kind of tubular type Soil-Nailing Wall Structure and its construction method |
| CN110005872A (en) * | 2019-04-23 | 2019-07-12 | 河海大学 | An integrated pipeline for transportation and grouting and its operation method |
| CN110005872B (en) * | 2019-04-23 | 2021-01-05 | 河海大学 | Transportation and grouting integrated pipeline and operation method thereof |
| CN110067253A (en) * | 2019-06-05 | 2019-07-30 | 招商局重庆交通科研设计院有限公司 | From anchoring miniature steel pipe anchoring pile |
| CN114197496A (en) * | 2021-12-16 | 2022-03-18 | 山东大学 | A kind of side slope reinforcement device and construction method of railway subgrade |
| CN114197496B (en) * | 2021-12-16 | 2023-03-10 | 山东大学 | Side slope reinforcing device of railway roadbed and construction method |
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