CN207109812U - A kind of reinforced anchor rod support system - Google Patents

Abstract

The utility model discloses a reinforced bolt support system, which comprises a support pile, an expansion body and a waist beam. The anchor bolt is connected with the support pile through the waist beam to form a support system. The waist beam is a reinforced waist beam. On the support pile, the side of the waist beam close to the support pile is connected with the support pile, two or more anchors are anchored to the same waist beam section at the same time, and the outer anchoring surface of the waist beam is provided with prestressed anchors. Anchors are anchored by setting ordinary steel backing plates and wedge-shaped steel backing plates at different angles to match with anchor rods at different angles. The utility model combines the advantages of reinforced waist beams to enhance the integrity of the support structure and the simultaneous action of multiple expanded anchors to enhance the anchor stiffness of the anchors, and is aimed at the complex surrounding environment, poor soil quality or the deformation control requirements of foundation pit support High adverse working conditions provide a more reliable and convenient solution. At the same time, the construction technology is mature, the construction efficiency is high, and the project cost is low. The ordinary pile-anchor support construction equipment can complete the construction.

Description

A reinforced bolt support system

technical field

The utility model relates to a reinforced bolt support system.

Background technique

With the development of underground space, foundation pit support is particularly important in the field of geotechnical engineering. Compared with the pile-support system, the pile-anchor system has been widely used and the effect is remarkable because of its lower cost and effective reduction of construction period. However, in the urban foundation pit support project, due to the surrounding environment of the foundation pit, such as poor soil quality, the existence of basements, underground pipelines, subways, etc., the conventional pile-anchor support system may cause pullout resistance due to the limited length of the anchor rod. Insufficient bearing capacity leads to large deformation of the support structure, which cannot meet the design and construction requirements of foundation pit support. In order to solve the problem that the foundation pit slope stability and deformation displacement cannot meet the design requirements caused by the obstruction of adjacent underground structures, underground pipelines and poor soil quality, the utility model provides a reinforced bolt support system.

Utility model content

The purpose of the utility model is to overcome the problem of the small bearing capacity of the anchor rod due to the limitation of the length of the anchor rod by the adjacent underground structures or underground pipelines, and the problem that the pull-out bearing capacity of the anchor rod is relatively small due to poor surrounding soil quality, and at the same time overcome the impact of the small waist beam stiffness. The integrity of the envelope structure contributes less to the problem, providing a reinforced bolt support system.

In order to solve the above technical problems, the following technical solutions are adopted:

A reinforced bolt support system, including support piles, anchor rods and waist beams. The anchor bolts are connected to the support piles through the waist beams to form a support system. The waist beams are arranged on one side of the support piles, and the side is the pit excavation side. The waist beam is a reinforced wide waist beam. Two or more anchor rods can be accommodated at the same waist beam section for anchoring. The side of the waist beam close to the support pile is connected to the support pile, and the other side of the waist beam is the outer anchor. On the surface, there are supporting anchors for prestressed anchors. The angle of the anchoring surface is different due to the incident angle of the anchor. The inclination angle of the anchoring surface of the waist beam matches one of the anchors. The backing plate and ordinary anchorage are used for anchoring, and the other anchor rods are adjusted and matched through wedge-shaped steel backing plates with different angle shapes, and then anchored by ordinary anchorage to meet the requirements of compressive strength and angle structure. In the support structure of the same project, the number of reinforced waist beams can be set according to the needs of specific design and construction. The reinforced waist beam can not only meet the needs of anchoring multiple groups of anchor rods at the same time, but also significantly increases the bending stiffness and shear strength of the waist beam because of its larger cross-section than the conventional waist beam, which plays an important role in the integrity of the entire support system. Reinforcement is achieved, and then the deformation of the foundation pit can be well controlled.

The anchor rod in the utility model is an expanded anchor rod. While shortening the length of the prestressed anchor rod in the pile-anchor system, the simultaneous anchoring design of multiple anchors can provide a bearing capacity several times larger than that of a conventional anchor rod. Therefore, in the narrow underground space or soil with poor soil quality, the utility model greatly enhances the applicability of the anchor rod from the perspective of technology and construction, and is more limited by the surrounding environment and soil quality. Small, broad application prospects.

Furthermore, the incidence angles of multiple bolts in the same waist beam section are different, the inclination angle between the anchor bolts in the upper soil layer and the horizontal plane is α, and the inclination angles between the anchor bolts in the upper soil layer and the horizontal plane are β, γ ..., and α<β<γ....

Further, the minimum distance between anchoring segments of adjacent anchor rods is ΔX, and ΔX is not less than 2.5 meters.

Further, two or more anchor rods are anchored on the same section of the waist beam, which is very beneficial to the support pile structure with small pile spacing, and facilitates the construction of anchor rods passing through the support piles, and can appropriately increase the lateral arrangement of anchor rods. The horizontal spacing can reduce the workload of drilling holes on the support piles or in the gaps of the support piles in the anchor rod construction project.

Furthermore, the reinforced bolt support system can act solely on the foundation pit support structure, or it can work together with the conventional bolt support system on the foundation pit support structure to form a mixed support.

Further, the reinforced bolt support system can cooperate with support piles to form a pile-anchor support structure, and can also cooperate with an underground diaphragm wall to form a wall-anchor support structure.

Owing to adopting above-mentioned technical scheme, have following beneficial effect:

The utility model is a reinforced bolt support system. The utility model has mature construction technology, high construction efficiency and low engineering cost. Ordinary pile-anchor support construction equipment can complete the construction, and compared with other alternative support schemes, the construction period or cost is greatly reduced.

The utility model combines the advantages of reinforced waist beams to enhance the integrity of the support structure and the simultaneous action of multiple expanded anchors to enhance the anchor stiffness of the anchors, and is aimed at the complex surrounding environment, poor soil quality or the deformation control requirements of foundation pit support High unfavorable working conditions provide more reliable and convenient solutions, which greatly improves the applicability of the bolt support system and has broad prospects.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is the structure of reinforced type lumbar beam in the utility model and the schematic diagram of bolt anchorage node;

Fig. 2 is a structural representation of a reinforced bolt support system in the utility model;

Fig. 3 is the structural representation that a plurality of reinforced waist beams and anchor rods are arranged in a foundation pit support section in the utility model;

Fig. 4 is the structural representation of reinforced bolt support structure and common bolt support structure in the utility model;

In the figure: 1-support pile; 2-reinforced waist beam; 3-anchor rod; 4-common steel backing plate; 5-wedge steel backing plate; ; 8-expansion body anchor; 9-ordinary waist beam; 10-ordinary anchor; 11-horizontal plane.

Detailed ways

As shown in Figure 1 to Figure 2, it includes support pile 1, expanded body 3 and reinforced waist beam 2, expanded body 3 is connected with support pile 1 through reinforced waist beam 2 to form a support system, reinforced waist beam 2 Set on the support pile 1, the side close to the support pile is connected to the support pile 1, and two or more anchor rods 3 pass through the same section of the support pile 1 and the reinforced waist beam 2 at the same time, at the waist The anchorage surface 7 on the outer side of the beam is anchored by the supporting anchorage 6 of the anchor rod. In order to increase the force bearing surface of the anchorage, a steel backing plate is added between the supporting anchorage 6 of the anchor rod and the reinforced waist beam 2, and all the anchor rods 3 enter the support The soil on the rear side of the pile protection has a certain angle with the horizontal plane 11, and the angles are different. The anchoring surface 7 outside the waist beam is a plane structure, and its plane inclination angle matches the inclination angle of one of the rods (Fig. 1 example Among them, the inclination angle of the outer anchoring surface 7 of the waist beam matches the inclination angle of the lower row of anchor rods), the anchorage is carried out through the ordinary steel backing plate 4 parallel to the outer anchoring surface 7 and the supporting anchorage 6 for the anchor rods, and the other anchor rods are anchored through different angles The shaped wedge-shaped steel backing plate 5 is matched after the anchoring angle is adjusted, and then anchored by the supporting anchorage 6 of the anchor rod.

As shown in Figures 1 to 2, the anchor rod in the utility model is an expanded body anchor rod 8. Two or more expansion anchors 8 are simultaneously anchored to the same section of the reinforced waist beam 2, the angle between the expansion anchors 8 in the upper soil layer and the horizontal plane 11 is α, and the expansion anchors below it The included angles between 8 and 11 on the horizontal plane are β, γ… in turn, where α<β<γ…. The minimum distance between the anchoring sections of adjacent anchor rods is ΔX, and ΔX≥2.5 meters. In general, the length of the bolts is set as follows: the length of the upper row of bolts < the length of the lower bolts. Such a multi-angle and different length setting method is mainly to make the anchoring sections of each bolt fully open in the soil and mutually Staggered to avoid construction collision and group anchor effect.

Two or more expansion anchors 8 are anchored on the same cross-section of the reinforced waist beam 2, which is very beneficial for structures with small spacing between support piles 1, and facilitates the construction of expansion anchors 8 passing through support piles 1 , can appropriately increase the horizontal spacing of the lateral arrangement of the expansion anchors 8, reduce the workload of drilling holes on the support piles 1 or in the gaps of the support piles 1 during the construction of the expansion anchors 8, and ensure that the design requirements can be met. , and convenient for construction.

As shown in Figure 2, the reinforced bolt support system can act on a foundation pit support section alone, or multiple sets can be set in a foundation pit support section (as shown in Figure 3), depending on the design support strength need.

The utility model can be used in combination with conventional expansion bolts and ordinary bolts to form a hybrid bolt support system. As shown in Figure 4, on the same foundation pit support section, there are reinforced waist beams 2 and expansion Reinforced bolt support structure composed of anchor rods 8, there is also an ordinary support structure of expanded body anchor rods composed of ordinary waist beams 9 and expanded body anchor rods 8 (left in Figure 4) or a common support structure composed of ordinary waist beams 9 and ordinary anchor rods 10 common bolt support structure (Fig. 4 right). This scheme can support and strengthen foundation pit parts with poor local soil quality or poor construction conditions, thereby greatly enhancing the applicability of the anchor rod and having broad application prospects.

The utility model can be constructed under the conditions of limited space around the foundation pit and complex environment, and is less affected by the surrounding environment, fully exerting the advantages of the pile-anchor support system, and has the advantages of high construction efficiency, easy operation, and low engineering cost. Compared with other alternative support schemes, the construction period and cost are greatly reduced.

During construction, the support pile 1 is constructed before the excavation of the foundation pit, and the construction of the expansion anchor rod 8 is carried out crosswise with the excavation of the earthwork. The pile-anchor support system can provide a relatively spacious working space for other sub-projects and facilitate the construction of underground structures. The construction technology is mature, the noise is small, and there is no pollution. The utility model is suitable for strata such as cohesive soil, silt soil, sandy soil, plain fill soil, pebbles and crushed stones. This support system can be used when there are underground pipelines, subways, basements, etc. around the foundation pit, the construction space is limited, the stability of the foundation pit support, deformation and displacement are high, and the conventional pile-anchor support system is difficult to implement. .

The above are only specific embodiments of the utility model, but the technical features of the utility model are not limited thereto. Any simple changes, equivalent replacements or modifications based on the utility model to solve basically the same technical problems and achieve basically the same technical effects are covered by the protection scope of the utility model.

Claims (5)

1. A kind of 1. reinforced anchor rod support system, it is characterised in that：Including support pile, anchor pole and waist rail, the anchor pole passes through institute State waist rail to be connected to form support system with the support pile, the waist rail is arranged on the support pile side, and the side is opened for foundation ditch Dig side；The waist rail for strengthen molded breadth waist rail, the waist rail can accommodate more than two anchor pole pass through same waist rail section and then Anchored on the outside of waist rail on anchoring face.
2. A kind of 2. reinforced anchor rod support system according to claim 1, it is characterised in that：The outside anchoring of the waist rail Face angle degree is different because the incidence angle of anchor pole is different, and the anchoring face matches with a wherein anchor pole, and other anchor poles pass through difference The wedge billet of angle shape carries out anchoring angular adjustment matching.
3. A kind of 3. reinforced anchor rod support system according to claim 1, it is characterised in that：The anchor pole is expansion body anchor Bar, more inclination angles between anchor pole and horizontal plane on the same reinforced waist rail section are different, and rock-bolt length is different, And the body that expands of two adjacent anchor poles anchors intersegmental minimum range as Δ X, the Δ X is not less than 2.5 meters.
4. A kind of 4. reinforced anchor rod support system according to claim 1, it is characterised in that：The single work of support system For in foundation pit supporting construction, or together with the suspension roof support system of routine, collective effect forms mixing in foundation pit supporting construction Support form.
5. A kind of 5. reinforced anchor rod support system according to claim 1, it is characterised in that：The support system and supporting Stake cooperatively forms anchored pile supporting, or cooperatively forms joist anchor supporting construction with diaphram wall.